pmacct (Promiscuous mode IP Accounting package) v0.14.0
pmacct is Copyright (C) 2003-2012 by Paolo Lucente

0.14.0 -- 11-04-2012
  + pmacct now integrates an IS-IS daemon within collectors; the daemon
    is being run as a parallel thread within the collector core process;
    a single L2 P2P neighborship, ie. over a GRE tunnel, is supported;
    it implements P2P Hello, CSNP and PSNP - and does not send any LSP
    information out. The daemon is currently used for route resolution.
    It is well suited to several case-studies, popular one being: more
    specific internal routes are carried within the IGP while they are
    summarized in BGP crossing cluster boundaries.
  + A new aggregation primitive 'etype' has been introduced in order to
    support accounting against the EtherType field of Ethernet frames.
    The implementation is consistent across all data collection methods
    and backends.
  + sfacctd: introduced support for samples generated on ACL matches in
    Brocade (sFlow sample type: Enterprise: #1991, Format: #1). Thanks
    to Elisa Jasinska and Brent Van Dussen for their support.
  + sfacctd, pre_tag_map: introduced sample_type key. In sFlow v2/v4/v5
    this is compared against the sample type field. Value is expected
    in <Enterprise>:<Format> notation.
  ! fix, signals.c: ignoring SIGINT and SIGTERM in my_sigint_handler()
    to prevent multiple calls to fill_pipe_buffer(), condition that can
    cause pipe buffer overruns. Patch is courtesy by Osama Abu Elsorour.
  ! fix, pmacctd: tunnel registry now correctly supports multiple tunnel
    definitions for the same stack level. 
  ! fix, print plugin: cos field now correctly shows up in the format
    title while CSV format is selected and L2 primitives are enabled.
  ! fix, util.c: a feof() check has been added to the fread() call in
    read_SQLquery_from_file(); thanks to Elisa Jasinska and Brent Van
    Dussen for their support.
  ! fix, nfprobe: NetFlow output socket is now re-opened after failing
    send() calls. Thanks to Maurizio Molina for reporting the problem.
  ! fix, sfacctd: length checks have been imporved while extracting
    string tokens (ie. AS-PATH and BGP communities) from sFlow Extended
    Gateway object. Thanks to Duncan Small for his support.

0.14.0rc3 -- 07-12-2011
  + BGP daemon: BGP/MPLS VPNs (rfc4364) implemented! This encompasses both
    RIB storage (ie. virtualization layer) and lookup. bgp_iface_to_rd_map
    map correlates <router IP, input/output interfaces (ifIndex)> couples
    to Route Distinguishers (RDs). RD encapsulation types #0 (2-bytes ASN),
    #1 (IP address) and #2 (4-bytes ASN) are supported. Examples provided:
    examples/bgp_iface_to_rd.map and EXAMPLES files.
  + mpls_vpn_rd aggregation primitive has been added to the set. Also this
    is being supported key in Pre-Tagging (pre_tag_map). 
  + print plugin: introduced print_output_file feature to write statistics
    to files. Output is text, formatted or CSV. Filenames can contain time-
    based variables to make them dynamic. If filename is static instead,
    content is overwritten over time.
  + print plugin: introduced print_time_roundoff feature to align time slots
    nicely, same as per the sql_history_roundoff directive.
  + print plugin: introduced print_trigger_exec feature to execute custom
    scripts at each print_refresh_time interval (ie. to process, expire,
    gzip, etc. files). Feature is in sync with wrap-up of data commit to
    screen or files.
  + pmacctd: introduced support for DLT_LOOP link-type (ie. OpenBSD tunnel
    interfaces). Thanks to Neil Reilly for his support. 
  + uacctd: a cache of ifIndex is introduced. Hash structure with conflict
    chains and short expiration time (ie. to avoid getting tricked by cooked
    interfaces devices a-la ppp0). The cache is an effort to gain speed-ups.
    Implementation is courtesy by Stephen Hemminger, Vyatta.
  + Logging: introduced syslog-like timestamping when writing directly to
    files. Also a separate FD per process is used and SIGHUP elicits files
    reopening: all aimed at letting proper logs rotation by external tools.
  + Introduced plugin_pipe_backlog configuration directive: it induces a
    backlog of buffers on the pipe before actually releasing them to the
    plugin. The strategy helps optimizing inter-process communications, ie.
    when plugins are quicker processing data than the Core process.
  ! fix, peer_src_ip primitive: has been disconnected from [ns]facctd_as_new
    mechanism in order to ensure it's always representing a reference to the
    NetFlow or sFlow emitter.
  ! fix, nfprobe: input and output VLAN ID field types have been aligned to
    RFC3954, which appears to be also retroactively supported by IPFIX. The
    new field types are #58 and #59 respectively. Thanks to Maurizio Molina
    for pointing the issue out.
  ! fix, IMT plugin: fragmentation of the class table over multiple packets
    to the pmacct IMT client was failing and has been resolved. 
  ! fix, nfprobe: individual flows start and end timestamps are now filled
    to the msec resolution. Thanks to Daniel Aschwanden for having reported
    the issue.
  ! fix, uacctd: NETLINK_NO_ENOBUFS is set to prevent the daemon being
    reported about ENOBUFS events by the underlying operating system. Works
    on kernels 2.6.30+. Patch is courtesy by Stephen Hemminger, Vyatta.
  ! fix, uacctd: get_ifindex() can now return values greater than 2^15. Patch
    is courtesy by Stephen Hemminger, Vyatta.
  ! fix, pmacctd, uacctd: case of zero IPv6 payload in conjunction with no
    IPv6 next header is now supported. Thanks to Quirin Scheitle for having
    reported the issue.
  - Support for is_symmetric aggregation primitive is discontinued.

0.14.0rc2 -- 26-08-2011
  + sampling_map feature is introduced, allowing definition of static traffic
    sampling mappings. Content of the map is reloadable at runtime. If a
    specific router is not defined in the map, the sampling rate advertised
    by the router itself, if any, is applied.
  + nfacctd: introduced support for 16 bits SAMPLER_IDs in NetFlow v9/IPFIX;
    this appears to be the standard length with IOS-XR.
  + nfacctd: introduced support for (FLOW)_SAMPLING_INTERVAL fields as part
    of the NetFlow v9/IPFIX data record. This case is not prevented by the
    RFC although such information is typically exported as part of options.
    It appears some probes, ie. FlowMon by Invea-Tech, are getting down this
    way.
  + nfacctd, sfacctd: nfacctd_as_new and sfacctd_as_new got a new 'fallback'
    option; when specified, lookup of BGP-related primitives is done against
    BGP first and, if not successful, against the export protocol.
  + nfacctd, sfacctd: nfacctd_net and sfacctd_net got a new 'fallback' option
    that when specified looks up network-related primitives (prefixes, masks)
    against BGP first and, if not successful, against the export protocol. It
    gets useful for resolving prefixes advertised only in the IGP.
  + sql_num_hosts feature is being introduced: defines, in MySQL and SQLite
    plugins, whether IP addresses should be left numerical (in network bytes
    ordering) or converted into strings. For backward compatibility, default
    is to convert them into strings.
  + print_num_protos and sql_num_protos configuration directives have been
    introduced to allow to handle IP protocols (ie. tcp, udp) in numerical
    format. The default, backward compatible, is to look protocol names up.
    The feature is built against all plugins and can also be activated via
    the '-u' commandline switch.
  ! fix, nfacctd: NetFlow v9/IPFIX sampling option parsing now doesn't rely
    anymore solely on finding a SamplerID field; as an alternative, presence
    of a sampling interval field is also checked. Also a workaround is being
    introduced for sampled NetFlow v9 & C7600: if samplerID within a data
    record is defined and set to zero and no match was possible, then the
    last samplerID defined is returned.
  ! nfacctd: (FLOW)_SAMPLING_INTERVAL fields as part of the NetFlow v9/IPFIX
    data record are now supported also 16-bits long (in addition to 32-bits).
  ! fix, SQL plugins: sql_create_table() timestamp has been aligned with SQL
    queries (insert, update, lock); furthermore sql_create_table() is invoked
    every sql_refresh_time instead of every sql_history. Docs updated. Thanks
    to Luis Galan for having reported the issue.
  ! fix, pmacct client: error code when connection is refused on UNIX socket
    was 0; it has been changed to 1 to reflect the error condition. Thanks
    to Mateusz Viste for reporting the issue.
  ! fix, building system: CFLAGS were not always honoured. Patch is courtesy
    of Etienne Champetier
  ! fix, ll.c: empty return value was causing compiler with certain flags to
    complain about the issue. Patch is courtesy of Ryan Steinmetz.

0.14.0rc1 -- 31-03-2011
  + IPFIX (IETF IP Flow Information Export protocol) replication and
    collector capabilities have been introduced as part of nfacctd, the
    NetFlow accounting daemon of the pmacct package. 
  + nfprobe plugin: initial IPFIX export implementation. This is called
    via a 'nfprobe_version: 10' configuration directive. pmacctd, the
    promiscuous mode accounting daemon, and uacctd, the ULOG accounting
    daemon, both part of the pmacct package are now supported.
  + Oracle's BrekeleyDB 11gR2 offers a perfect combination of technologies
    by including an SQL API that is fully compatible with SQLite. As a
    result pmacct now opens to BerkeleyDB 5.x via its SQLite3 plugin.
  + sfacctd: BGP-related traffic primitives (AS Path, local preference,
    communities, etc.) are now read from sFlow Extended Gateway object if
    sfacctd_as_new is set to false (default).
  + nfacctd, sfacctd: source and destination peer ASNs are now read from
    NetFlow or sFlow data if [ns]facctd_as_new is set to false (default). 
  + nfacctd: introduced support for NetFlow v9/IPFIX source and destination
    peer ASN field types 128 and 129. The support is enabled at runtime by
    setting to 'false' (default) the 'nfacctd_as_new' directive. 
  + sfacctd: f_agent now points sFlow Agent ID instead of source IP address;
    among the other things, this allows to compare BGP source IP address/BGP
    Router-ID against the sFlow Agent ID.
  + PostgreSQL plugin: 'sql_delimiter' config directive being introduced:
    if sql_use_copy is true, uses the supplied character as delimiter.Useful
    in cases where the default delimiter is part of any of the supplied
    strings.
  + pmacct client: introduced support for Comma-Separated Values (CSV) output
    in addition to formatted-text. A -O commandline switch allows to enable
    the feature.
  ! fix, MySQL/PostgreSQL/SQLite3 plugins: insert of data into the database
    can get arbitrarily delayed under low traffic conditions. Many Thanks
    to Elisa Jasinska and Brent Van Dussen for their great support in solving
    the issue. 
  ! fix, BGP daemon: multiple BGP capabilities per capability announcement
    were not supported - breaking compliancy with RFC5492. The issue was
    only verified against a OpenBGPd speaker. Patch is courtesy of Manuel
    Guesdon.
  ! fix, initial effort made to document uacctd, the ULOG accounting daemon

0.12.5 -- 28-12-2010
  + nfacctd: introduced support for NAT L3/L4 field values via xlate_src
    and xlate_dst configuration directives. Implementation follows IPFIX
    standard for IPv4 and IPv6 (field types 225, 226, 227, 228, 281 and
    282).
  + nfacctd: Cisco ASA NetFlow v9 NSEL field types 40001, 40002, 40003,
    40004 and IPFIX/Cisco ASA NetFlow v9 NSEL msecs absolute timestamps
    field types 152, 153 and 323 have been added.
  + nfacctd: introduced support for 'new' TCP/UDP source/destination ports
    (field types 180, 181, 182, 183), as per IPFIX standard, basing on the
    L4 protocol value (if any is specified as part of the export; otherwise
    assume L4 is not TCP/UDP). 
  + nfacctd, nfprobe: introduced support for application classification
    via NetFlow v9 field type #95 (application ID) and application name
    table option. This feature aligns with Cisco NBAR-NetFlow v9
    integration feature.
  + nfacctd: introduced support for egress bytes and packet counters (field
    types 23, 24) basing on the direction value (if any is specified as
    part of the export; otherwise assume ingress as per RFC3954).
  + nfprobe: egress IPv4/IPv6 NetFlow v9 templates have been introduced;
    compatibility with Cisco (no use of OUT_BYTES, OUT_OUT_PACKETS) taken
    into account.
  + nfacctd: added support for egress datalink NetFlow v9 fields basing
    on direction field.
  + nfacctd, sfacctd: aggregate_filter can now filter against TCP flags;
    also, [ns]facctd_net directive can now be specified per-plugin.
  + BGP daemon: introduced support for IPv6 transport of BGP messaging.
  + BGP daemon: BGP peer information is now linked into the status table
    for caching purposes. This optimization results in good CPU savings
    in bigger deployments.
  ! fix, nfacctd, sfacctd: daemons were crashing on OpenBSD platform upon
    setting an aggregate_filter configuration directive. Patch is courtesy
    of Manuel Pata.
  ! fix, xflow_status.c: status entries were not properly linked to the
    hash conflict chain resulting in a memory leak. However the maximum
    number of table entries set by default was preventing the structure
    to grow undefinitely.
  ! fix, sql_common.c: increased buffer size available for sql_table_schema
    from 1KB to 8KB. Thanks to Michiel Muhlenbaumer his support. 
  ! fix, bgp_agent_map has been improved to allow mapping of NetFlow/sFlow
    agents making use of IPv6 transport to either a) IPv4 transport address
    of BGP sessions or b) 32-bit BGP Router IDs. Mapping to IPv6 addresses
    is however not (yet) possible.
  ! fix, nfprobe: encoding of NetFlow v9 option scope has been improved;
    nfprobe source IPv4/IPv6 address, if specified via nfprobe_source_ip
    directive, is now being written.
  ! fix, util.c: string copies in trim_spaces(), trim_all_spaces() and
    strip_quotes() have been rewritten more safely. Patch is courtesy of
    Dmitry Koplovich.
  ! fix, sfacctd: interface format is now merged back into interface value
    fields so to ease keeping track of discards (and discard reasons) and
    multicast fanout.
  ! fix, MySQL, SQLite3 plugins: sql table version 8 issued to provide
    common naming convention when mapping primitives to database fields
    among the supported RDBMS base. Thanks to Chris Wilson for his support.
  ! fix, pmacct client: numeric variables output converted to unsigned
    from signed.
  ! fix, nfacctd_net, sfacctd_net: default value changed from null (and
    related error message) to 'netflow' for nfacctd_net and 'sflow' for
    sfacctd_net.
  ! fix, nfacctd, sfacctd: aggregate_filter was not catching L2 primitives
    (VLAN, MAC addresses) when performing egress measurements.  

0.12.4 -- 01-10-2010
  + BGP daemon: a new memory model is introduced by which IP prefixes
    are being shared among the BGP peers RIBs - leading to consistent
    memory savings whenever multiple BGP peers export full tables due
    to the almost total overlap of information. Longest match nature
    of IP lookups required to raise BGP peer awareness of the lookup
    algorithm. Updated INTERNALS document to support estimation of the
    memory footprint of the daemon.
  + BGP daemon: a new bgp_table_peer_buckets configuration directive
    is introduced: per-peer routing information is attached to IP
    prefixes and now hashed onto buckets with conflict chains. This
    parameter sets the number of buckets of such hash structure; the
    value is directly related to the number of expected BGP peers,
    should never exceed such amount and is best set to 1/10 of the
    expected number of peers.
  + nfprobe: support has been added to export direction field (NetFlow
    v9 field type #61); its value, 0=ingress 1=egress, is determined
    via nfprobe_direction configuration directive.
  + nfacctd: introduced support for Cisco ASA bytes counter, NetFlow v9
    field type #85. Thanks to Ralf Reinartz for his support. 
  + nfacctd: improved flow recognition heuristics for cases in which
    IPv4/IPv6/input/output data are combined within the same NetFlow
    v9 template. Thanks to Carsten Schoene for his support.
  ! fix, BGP daemon: bgp_nexthop_followup was not working correctly if
    pointed to a non-existing next-hop.
  ! fix, nfv9_template.c: ignoring unsupported NetFlow v9 field types;
    improved template logging. Thanks to Ralf Reinartz for his support.
  ! fix, print plugin: support for interfaces and network masks has
    been added. Numeric variables output converted to unsigned from
    signed. 

0.12.3 -- 28-07-2010
  + 'cos' aggregation primitive has been implemented providing support
    for 802.1p priority. Collection is supported via sFlow, libpcap and
    ULOG; export is supported via sFlow. 
  + BGP daemon: TCP MD5 signature implemented. New 'bgp_daemon_md5_file'
    configuration directive is being added for the purpose of defining
    peers and their respective MD5 keys, one per line, in CSV format. 
    The map is reloadable at runtime: existing MD5 keys are removed via
    setsockopt(), new ones are installed as per the newly supplied map.
    Sample map added in 'examples/bgp_md5.lst.example'.
  + BGP daemon: added support for RFC3107 (SAFI=4 label information) to
    enable receipt of labeled IPv4/IPv6 unicast prefixes. 
  + nfprobe, sfprobe: introduced the concept of traffic direction. As a
    result, [ns]fprobe_direction and [ns]fprobe_ifindex configuration
    directives have been implemented. 
  + [ns]fprobe_direction defines traffic direction. It can be statically
    defined via 'in' or 'out' keywords; values can also be dynamically
    determined through a pre_tag_map (1=input, 2=output) by means of 
    'tag' and 'tag2' keywords.
  + [ns]fprobe_ifindex either statically associate an interface index
    (ifIndex) to a given [ns]fprobe plugin or semi-dynamically via
    lookups against a pre_tag_map by means of 'tag' and 'tag2' keywords.
  + sfprobe: sfprobe_ifspeed configuration directive is introduced and
    aimed at statically associating an interface speed to an sfprobe
    plugin. 
  + sfprobe: Switch Extension Header support added. Enabler for this
    development was support for 'cos' and in/out direction. Whereas
    VLAN information was already supported as an aggregation primitive.
  + sfprobe: added support for Counter Samples for multiple interfaces. 
    Sampling function has been brought to the plugin so that Counter
    Samples can be populated with real bytes/packets traffic levels.
  ! nfprobe, sfprobe: send buffer size is now aligned to plugin_pipe_size,
    if specified, providing a way to tune buffers in case of sustained
    exports.
  ! fix, addr.c: pm_ntohll() and pm_htonll() routines rewritten. These
    are aimed at changing byte ordering of 64-bit variables.
  ! fix, BGP daemon: support for IPv6 global address/link-local address
    next-hops as part of MP_REACH_NLRI parsing.
  ! fix, cfg_handlers.c: bgp_daemon and bgp_daemon_msglog parsing was
    not correct, ie. enabled if specified as 'false'. Thanks to Brent
    Van Dussen for reporting the issue.
  ! fix, bgp.c: found a CPU hog issue caused by missing cleanup of the
    select() descriptors vector. 
  ! fix, pmacct.c: in_iface/out_iface did erroneously fall inside a
    section protected by the "--disable-l2" switch. Thanks to Brent
    Van Dussen for reporting the issue.

0.12.2 -- 27-05-2010
  + A new 'tee' plugin is introduced bringing both NetFlow and sFlow
    replication capabilities to pmacct. It supports transparent mode
    (tee_transparent), coarse-grained filtering capabilities via the
    Pre-Tagging infrastructure. Quickstart guide is included as part
    of the EXAMPLES file (chapter XII).
  + nfprobe, sfprobe: introduced support for export of the BGP next-hop 
    information. Source data selection for BGP next-hop is being linked
    to [pmacctd_as|uacctd_as] configuration directive. Hence it must be
    set to 'bgp' in order for this feature to work.
  + nfprobe, sfprobe, BGP daemon: new set of features (nfprobe_ipprec,
    sfprobe_ipprec, bgp_daemon_ipprec) allows to mark self-originated
    sFlow, NetFlow and BGP datagrams with the supplied IP precedence
    value.
  + peer_src_ip (IP address of the NetFlow emitter, agent ID of the
    sFlow emitter) and peer_dst_ip (BGP next-hop) can now be filled
    from NetFlow/sFlow protocols data other than BGP. To activate the
    feature nfacctd_as_new/sfacctd_as_new have to be 'false' (default
    value), 'true' or 'file'.
  + print plugin: introduced support for Comma-Separated Values (CSV)
    output in addition to formatted-text. A new print_output feature
    allows to switch between the two.  
  + pmacctd: improved 802.1ad support. While recursing, outer VLAN is
    always reported as value of the 'vlan' primitive.
  ! fix, pmacctd: 802.1p was kept integral part of the 'vlan' value.
    Now a 0x0FFF mask is applied in order to return only the VLAN ID.
  ! fix, pkt_handlers.c: added trailing '\0' symbol when truncating
    AS-PATH and BGP community strings due to length constraints.
  ! fix, sql_common.c: maximum SQL writers warning message was never
    reached unless a recovery method is specifited. Thanks to Sergio
    Charpinel Jr for reporting the issue.
  ! fix, MySQL and PostgreSQL plugins: PGRES_TUPLES_OK (PostgreSQL)
    and errno 1050 (MySQL) are now considered valid return codes when
    dynamic tables are involved (ie. sql_table_schema). Thanks to
    Sergio Charpinel Jr for his support.
  ! fix, BGP daemon: pkt_bgp_primitives struct has been explicitely
    64-bit aligned. Mis-alignment was causing crashes when buffering
    was enabled (plugin_buffer_size). Verified on Solaris/sparc.

0.12.1 -- 07-04-2010
  + Input/output interfaces (SNMP indexes) have now been implemented
    natively; it's therefore not required anymore to pass through the
    (Pre-)tag infrastructure. As a result two aggregation primitives
    are being introduced: 'in_iface' and 'out_iface'.
  + Support for source/destination IP prefix masks is introduced via
    two new aggregation primitives: src_mask and dst_mask. These are
    populated as defined by the [nf|sf|pm|u]acctd_net directive:
    NetFlow/sFlow protocols, BGP, Network files (networks_file) or
    static (networks_mask) being valid data sources.
  + A generic tunnel inspection infrastructure has been developed to
    benefit both pmacctd and uacctd daemons. Handlers are defined via
    configuration file. Once enabled daemons will account basing upon
    tunnelled headers rather than the envelope. Currently the only
    supported tunnel protocol is GTP, the GPRS tunnelling protocol
    (which can be configured as: "tunnel_0: gtp, <UDP port>"). Up to
    8 different tunnel stacks and up to 4 tunnel layers per stack are
    supported. First matching stack, first matching layer wins.
  + uacctd: support for the MAC layer has been added for the Netlink/
    ULOG Linux packet capturing framework.
  + 'nfprobe_source_ip' feature introduced: it allows to select the
    IPv4/IPv6 address to be used to export NetFlow datagrams to the
    collector.
  + nfprobe, sfprobe: network masks are now exported via NetFlow and
    sFlow. 'pmacctd_net' and its equivalent directives define how to
    populate src_mask and dst_mask values.
  ! cleanup, nfprobe/sfprobe: data source for 'src_as' and 'dst_as'
    primitives is now expected to be always explicitely defined (in
    line with how 'src_net' and 'dst_net' primitives work). See the
    UPGRADE doc for the (limited) backward compatibility impact.
  ! Updated SQL documentation: sql/README.iface guides on 'in_iface'
    and 'out_iface' primitives; sql/README.mask guides on 'src_mask'
    and 'dst_mask' primitives; sql/README.is_symmetric guides on
    'is_symmetric' primitive. 
  ! fix, nfacctd.h: source and destination network masks were twisted
    in the NetFlow v5 export structure definition. Affected releases
    are: 0.12.0rc4 and 0.12.0.
  ! fix, nfprobe_plugin.c: l2_to_flowrec() was missing some variable
    declaration when the package was configured for compilation with
    --disable-l2. Thanks to Brent Van Dussen for reporting the issue. 
  ! fix, bgp.c: bgp_attr_munge_as4path() return code was not defined
    for some cases. This was causing some BGP messages to be marked
    as malformed.
  ! fix, sfprobe: a dummy MAC layer was created whenever this was not
    included as part of the captured packet. This behaviour has been
    changed and header protocol is now set to 11 (IPv4) or 12 (IPv6)
    accordingly. Thanks to Neil McKee for pointing the issue. 
  ! workaround, building sub-system: PF_RING enabled libpcap was not
    recognized due to missing of pcap_dispatch(). This is now fixed. 

0.12.0 -- 16-02-2010
  + 'is_symmetric' aggregation primitive has been implemented: aimed
    at easing detection of asymmetric traffic. It's based on rule
    definitions supplied in a 'bgp_is_symmetric_map' map, reloadable
    at runtime.
  + A new 'bgp_daemon_allow_file' configuration directive allows to
    specify IP addresses that can establish a BGP session with the
    collector's BGP thread. Many thanks to Erik van der Burg for
    contributing the idea.
  + 'nfacctd_ext_sampling_rate' and 'sfacctd_ext_sampling_rate' are
    introduced: they flag the daemon that captured traffic is being
    sampled. Useful to tackle corner cases, ie. the sampling rate
    reported by the NetFlow/sFlow agent is missing or incorrect.
  + The 'bgp_follow_nexthop' feature has been extended so that extra
    IPv4/IPv6 prefixes can be supplied. Up to 32 IP prefixes are now
    supported and a warning message is generated whenever a supplied
    string fails parsing.
  + Pre-Tagging: implemented 'src_local_pref' and 'src_comms' keys.
    These allow tagging based on source IP prefix local_pref (sourced
    from either a map or BGP, ie. 'bgp_src_local_pref_type: map',
    'bgp_src_local_pref_type: bgp') and standard BGP communities.
  + Pre-Tagging: 'src_peer_as' key was extended in order to match on
    BGP-sourced data (bgp_peer_src_as_type: bgp).
  + Pre-Tagging: introduced 'comms' key to tag basing on up to 16
    standard BGP communities attached to the destination IP prefix.
    The lookup is done against the BGP RIB of the exporting router.
    Comparisons can be done in either match-any or match-all fashion;
    xidDocumentation and examples updated.
  ! fix, util.c: load_allow_file(), empty allow file was granting a
    connection to everybody being confused with a 'no map' condition.
    Now this case is properly recognized and correctly translates in
    a reject all clause.
  ! fix, sql_common.c: log of NetFlow micro-flows to a SQL database
    (nfacctd_sql_log directive) was not correctly getting committed
    to the backend, when sql_history was disabled.
  ! fix, mysql|pgsql|sqlite_plugin.c: 'flows' aggregation primitive
    was not suitable to mix-and-match with BGP related primitives
    (ie. peer_dst_as, etc.) due to an incorrect check. Many thanks
    to Zenon Mousmoulas for the bug report.
  ! fix, pretag_handlers.c: tagging against NetFlow v9 4-bytes in/out
    interfaces was not working properly. Thanks to Zenon Mousmoulas
    for reporting the issue.

0.12.0rc4 -- 21-12-2009
  + BGP-related source primitives are introduced, namely: src_as_path,
    src_std_comm, src_ext_comm, src_local_pref and src_med. These add
    to peer_src_as which was already implemented. All can be resolved
    via reverse BGP lookups; peer_src_as, src_local_pref and src_med
    can also be resolved via lookup maps which support checks like:
    bgp_nexthop (RPF), peer_dst_as (RPF), input interface and source
    MAC address. Many thanks to Zenon Mousmoulas and GRNET for their
    fruitful cooperation.
  + Memory structures to store BGP-related primitives have been
    optimized. Memory is now allocated only for primitives part of
    the selected aggregation profile ('aggregate' config directive).
  + A new 'bgp_follow_nexthop' configuration directive is introduced
    to follow the BGP next-hop up to the edge of the routing domain.
    This is particularly aimed at networks not running MPLS, where
    hop-by-hop routing is in place.
  + Lookup maps for BGP-related source primitives (bgp_src_med_map,
    bgp_peer_src_as_map, bgp_src_local_pref_map): result of check(s)
    can now be the keyword 'bgp', ie. 'id=bgp' which triggers a BGP
    lookup. This is thought to handle exceptions to static mapping.
  + A new 'bgp_peer_as_skip_subas' configuration directive is being
    introduced. When computing peer_src_as and peer_dst_as, returns
    the first ASN which is not part of a BGP confederation; if only
    confederated ASNs are on the AS-Path, the first one is returned
    instead.
  + Pre-Tagging: support has been introduced for NetFlow v9 traffic
    direction (ingress/egress). 
  + Network masks part of NetFlow/sFlow export protocols can now be
    used to compute src_net, dst_net and sum_net primitives. As a
    result a set of directives [nfacctd|sfacctd|pmacctd|uacctd]_net
    allows to globally select the method to resolve such primitives,
    valid values being: netflow, sflow, file (networks_file), mask
    (networks_mask) and bgp (bgp_daemon).
  + uacctd: introduced support for input/output interfaces, fetched
    via NetLink/ULOG API; interfaces are available for Pre-Tagging,
    and inclusion in NetFlow and sFlow exports. The implementation
    is courtesy of Stig Thormodsrud.
  + nfprobe, sfprobe: new [nfprobe|sfprobe]_peer_as option to set
    source/destination ASNs, part of the NetFlow and sFlow exports,
    to the peer-AS rather than origin-AS. This feature depends on a
    working BGP daemon thread setup.
  ! A few resource leaks were detected and fixed. Patch is courtesy
    of Eric Sesterhenn.
  ! bgp/bgp.c: thread concurrency was detected upon daemon startup
    under certain conditions. As a solution the BGP thread is being
    granted a time advantage over the traffic collector thread. 
  ! bgp/bgp.c: fixed a security issue which could have allowed a
    malicious user to disrupt established working BGP sessions by
    exploiting the implemented concept of BGP session replenishment;
    this has been secured by a check against the session holdtime.
    Many thanks to Erik van der Burg for spotting the issue.
  ! bgp/bgp.c: BGP listener socket now sets SO_REUSEADDR option for
    quicker turn around times while stopping/starting the daemon. 
  ! net_aggr.c: default route (0.0.0.0/0) was considered invalid;
    this is now fixed.

0.12.0rc3 -- 28-10-2009
  + Support for NetFlow v9 sampling via Option templates and
    data is introduced; this is twofold: a) 'nfacctd_renormalize'
    configuration directive is now able to renormalize NetFlow v9
    data on-the-fly by performing Option templates management; b)
    'nfprobe', the NetFlow probe plugin, is able to flag sampling
    rate (either internal or external) when exporting flows to the
    collector. 
  + '[pm|u]acctd_ext_sampling_rate' directives are introduced to
    support external sampling rate scenarios: packet selection is
    performed by the underlying packect capturing framework, ie.
    ULOG, PF_RING. Making the daemon aware of the sampling rate,
    allows to renormalize or export such information via NetFlow
    or sFlow.
  + pmacctd: the IPv4/IPv6 fragment handler engine was reviewed
    to make it sampling-friendly. The new code hooks get enabled
    when external sampling (pmacctd_ext_sampling_rate) is defined.
  + A new 'uacctd' daemon is added to the set; it is based on the
    Netlink ULOG packet capturing framework; this implies it works
    only on Linux and can be optionally enabled when compling by
    defining the '--enable-ulog' switch. The implementation is
    fully orthogonal with the existing feature set. Thanks very
    much to: A.O. Prokofiev for contributing the original idea
    and code; Stig Thormodsrud for his support and review. 
  + The 'tag2' primitive is introduced. Its aim is to support
    traffic matrix scenarios by giving a second field dedicated
    to tag traffic. In a pre_tag_map this can be employed via the
    'id2' key. See examples in the 'examples/pretag.map.example' 
    document. SQL plugins write 'tag2' content in the 'agent_id2'
    field. Read 'sql/README.agent_id2' document for reference. 
  + Some new directives to control and re-define file attributes
    written by the pmacct daemons, expecially when launched with
    increased priviledges, are introduced: file_umask, files_uid,
    files_gid. Files to which these apply include, ie. pidfile,
    logfile and BGP neighbors file.
  ! fix, bgp/bgp.c: upon reaching bgp_daemon_max_peers threshold,
    logs were flooded by warnings even when messages were coming
    from a previously accepted BGP neighbor. Warnings are now sent
    only when a new BGP connection is refused.
  ! fix, nfprobe/netflow9.c: tags (pre_tag_map, post_tag) were set
    per pair of flows, not respecting their uni-directional nature.
    It was generating hiding of some tags.
  ! fix, nfprobe/netflow9.c: templates were (wrongly) not being
    included in the count of flows sent in NetFlow v9 datagrams.
    While this was not generating any issues with parsing flows,
    it was originating visualization issues in Wireshark.
  ! fix, SQL plugins: CPU hitting 100% has been determined when
    sql_history is disabled but sql_history_roundoff is defined.
    Thanks to Charlie Allom for reporting the issue.
  ! fix, sfacctd.c: input and output interfaces (non-expaneded
    format) were not correcly decoded creating issues to Pre-
    tagging. Thanks to Jussi Sjostrom for reporting the issue.

0.12.0rc2 -- 09-09-2009
  + BGP daemon thread has been tied up with both the NetFlow and
    sFlow probe plugins, nfprobe and sfprobe, allowing to encode
    dynamic ASN information (src_as, dst_as) instead of reading
    it from text files. This finds special applicability within
    open-source router solutions.
  + 'bgp_stdcomm_pattern_to_asn' feature is introduced: filters
    BGP standard communities against the supplied pattern. The
    first matching community is split using the ':' symbol. The
    first part is mapped onto the peer AS field while the second
    is mapped onto the origin AS field. The aim is to deal with
    prefixes on the own address space. Ie. BGP standard community
    XXXXX:YYYYY is mapped as: Peer-AS=XXXXX, Origin-AS=YYYYY.
  + 'bgp_neighbors_file' feature is introduced: writes a list of
    the BGP neighbors in the established state to the specified
    file. This gets particularly useful for automation purposes
    (ie. auto-discovery of devices to poll via SNMP).
  + 'bgp_stdcomm_pattern' feature was improved by supporting the
    regex '.' symbol which can be used to wildcard a pre-defined
    number of characters, ie. '65534:64...' will match community
    values in the range 64000-64999 only.
  + SQL preprocess layer: removed dependency between actions and
    checks. Overral logics was reviewed to act more consistently
    with recently introduced SQL cache entry status field.
  + SQL common layer: poll() timeout is now calculated adaptively
    for increased deadline precision. 
  + sql_startup_delay feature functionality was improved in order
    to let it work as a sliding window to match NetFlow setups in
    which a) mainain original flow timestamps and b) enable the
    sql_dont_try_update feature is required.
  ! DST (Daylight Saving Time) support introduced to sql_history
    and sql_refresh_time directives. Thanks to <alshu@tut.by> for
    reporting the issue.
  ! fix, pmacctd.c: initial sfprobe plugin checks were disabling
    IP fragments handler. This was causing pmacctd to crash under
    certain conditions. Thanks to Stig Thormodsrud for having
    reported the issue.
  ! fix, nfprobe, netflow5.c: missing htons() call while encoding
    src_as primitive. 
  ! fix, BGP thread, bgp_aspath.c: estimated AS-PATH length was
    not enough for 32-bit ASNs. String length per-ASN increased
    from 5 to 10 chars.
  ! Documentation update, EXAMPLES: how to establish a local BGP
    peering between pmacctd and Quagga 0.99.14 for NetFlow and
    sFlow probe purposes.
  ! fix, print_status_table(): SEGV was showing up while trying
    to retrieve xFlow statistics by sending a SIGUSR1 signal and
    a collector IP address was not configured.
  ! ip_flow.[c|h]: code cleanup.

0.12.0rc1 -- 01-08-2009
  + a BGP daemon thread has been integrated in both the NetFlow
    and sFlow collectors, nfacctd and sfacctd. It maintains per-
    peer RIBs and supports MP-BGP (IPv4, IPv6) and 32-bit ASNs.
    As a result the following configuration directives are being
    introduced: bgp_daemon, bgp_daemon_ip, bgp_daemon_max_peers,
    bgp_daemon_port and bgp_daemon_msglog. For a quick-start and
    implementation notes refer to EXAMPLES document and detailed
    configuration directives description in CONFIG-KEYS.
  + A new set of BGP-related aggregation primitives are now
    supported by the "aggregate" directive: std_comm, ext_comm,
    as_path, peer_src_ip, peer_dst_ip, peer_src_as, peer_dst_as,
    med, local_pref. A few extra directives are being introduced
    to support (filter, map, cut down, etc.) some primitives:
    bgp_peer_src_as_type, bgp_peer_src_as_map, bgp_aspath_radius, 
    bgp_stdcomm_pattern and bgp_extcomm_pattern.
  + nfacctd_as_new supports a new value "bgp". It is meant to
    populate src_as and dst_as primitives by looking up source
    and destination IP prefixes against the NetFlow (or sFlow)
    agent RIB. 
  + A new sql_table_type directive is introduced: by combining
    it with sql_table_version, defines one of the standard BGP
    tables. 
  + Two new directives have been developed to support scenarios
    where NetFlow (or sFlow) agents are not running BGP or have
    default-only or partial views: bgp_follow_default and
    bgp_agent_map.
  + 4-bytes ASNs are now supported: including NetFlow and sFlow
    collectors, NetFlow and sFlow probes, networks_file to map
    prefixes to ASNs. The new BGP daemon implementation is, of
    course, fully compliant.  
  + Pre-Tagging: the ID is now a 32-bit unsigned value (it was
    16-bit). As a result, there valid tags can be in the range
    1-4294967295 and maps can now express the resulting ID as
    an IPv4 address (ie. bgp_agent_map).  
  + Pre-tagging: support for 32-bit input/output interfaces is
    now available.
  ! fix, sql_common.c: read_SQLquery_from_file() was returning
    a random value, regardless of the successful result. Patch
    has been provided provided by Giedrius Liubavicius
  ! fix, pmacct.c: when unused, source/destination IP address
    fields were presented as NULL values. This is now replaced
    with a '0' value to improve output parsing.
  ! Standard major release compilation check-pointing: thanks
    very much to Manuel Pata and Tobias Lott for their strong
    support with OpenBSD and FreeBSD respectively.

0.11.6 -- 07-04-2009
  + Introduced support for tag ranges into the 'pre_tag_filter' 
    configuration directive (ie. '10-20' matches traffic tagged
    in the range 10..20). This works both in addition to and in
    combination with negations.
  + Tcpdump-style filters, ie. 'aggregate_filter', now support
    indexing within a packet, ie. 'ether[12:2]', to allow a more
    flexible separation of the traffic.
  + Introduced support for descriptions in networks definition
    files pointed by the 'networks_file' configuration directive.
    Thanks to Karl O. Pinc for contributing the patch.
  ! fix, pmacctd: libpcap DLT_LINUX_SLL type is not defined in
    older versions of the library. It was preventing successful
    compilation of pmacct on OpenBSD. This has been fixed by
    defining internally to pmacct all DLT types in use. Thanks
    to Karl O. Pinc for his support.
  ! fix, IPv6 networks_file, load_networks6(): wrong masks were
    applied to IPv6 networks due to dirty temporary buffers for
    storing IPv6 addresses and masks. Short '::' IPv6 format is
    currently not supported. Thanks to Robert Blechinger for
    flagging the issue.
  ! fix, pretag.c: Pre-Tagging infrastructure was SEGV'ing after
    having been instructed to reload via a SIGHUP signal. Patch
    is courtesy of Denis Cavrois and the Acipia development team.
  ! fix, sfacctd, nfacctd: Assign16() was not handling correctly
    2-bytes EtherType values (ie. 0x86dd, 0x8847) in 802.1Q tags.
    As a result 'aggregate_filter' was not able to correctly match
    IPv6-related filters. Thanks to Axel Apitz for reporting the
    issue.
  ! fix, xflow_status.c: a cosmetic bug was displaying sequence
    numbers without applying previous increment. This definitely
    will help troubleshooting and debugging.
  ! fix, sfacctd, sfv245_check_status(): AF of the sFlow agent
    is now explicitely defined: when IPv6 is enabled the remote
    peer address can be reported as IPv4-mapped IPv6 address. This
    was causing warning messages to report the wrong sFlow agent
    IP address. Thanks to Axel Apitz for reporting the issue.
  ! fix, IMT plugin was crashing upon receipt of a classification
    table request (WANT_CLASS_TABLE) when stream classification
    was actually disabled.
  ! fix, pmacct.c: classifier index was not brought back to zero
    by the pmacct client. This was preventing the client to show
    correct stream classification when it was feeded with multiple
    queries. The fix is courtesy of Fabio Cairo.
  ! fix, MySQL plugin: upon enabling of the 'nfacctd_sql_log'
    directive, 'stamp_updated' field was incorrectly reported
    as '0000-00-00 00:00:00' due to wrong field formatting. Thanks
    to Brett D'Arcy for reporting and patching the issue.
  ! Initial effort to clean the code up by strcpy() calls. Thanks
    to Karl O. Pinc for taking such initiative.

0.11.5 -- 21-07-2008
  + SQL UPDATE queries code has been rewritten for increased
    flexibility. The SET statement is now a vector and part of
    it has been shifted into the sql_compose_static_set() routine
    in the common SQL layer.
  + A new sql_locking_style directive is now supported in the
    MySQL plugin. To exploit it, an underlying InnoDB table is
    mandatory. Thanks to Matt Gillespie for his tests.
  + Support for Endace DAG cards is now available; this has been
    tested against libDAG 3.0.0. Many thanks to Robert Blechinger
    for his extensive support.
  + pmacctd, the Linux Cooked device (DLT_LINUX_SLL) handler has
    been enhanced by supporting 'src_mac' and 'vlan' aggregation
    primitives.
  ! fix, xflow_status.c: NetFlow/sFlow collector's IP address is
    being rewritten as 0.0.0.0 when NULL. Was causing SEGVs on
    Solaris/sparc.
  ! fix, server.c: WANT_RESET is copied in order to avoid losing
    it when handling long queries and need to fragment the reply.
    Thanks very much to Ruben Laban for his support.
  ! fix, MySQL plugin: the table name is now escaped in order to
    not conflict with reserved words, if one of those is selected.
    Thanks to Marcel Hecko for reporting the bug.
  ! An extra security check is being introduced in sfacctd as an
    unsupported extension sent over by a Foundry Bigiron 4000 kit
    was causing SEGV issues. Many Thanks to Michael Hoffrath for
    the strong support provided.
  ! fix, 'nfprobe' plugin: AS numbers were not correctly exported
    to the collector when pmacctd was in use. Patch is courtesy of
    Emerson Pinter.
  ! fix, 'nfprobe' plugin: MACs were not properly encapsulated
    resulting in wrong addresses being exported through NetFlow
    v9. The patch is courtesy of Alexander Bergolth.
  ! fix, buffers holding MAC address strings throughout the code
    had not enough space to store the trailing zero. The patch is
    courtesy of Alexander Bergolth.
  ! fix, logfile FD was not correctly passed onto active plugins.
    The patch is courtesy of Denis Cavrois.
  ! Missing field type 60 in NetFlow v9 IPv6 flows, was leading
    nfacctd to incorrect flow type selection (IPv4). An additional
    check on the source IP address has now been included to infer
    IPv6 flows. RFC3954 mandates such field type to be present for
    IPv6 flows. The issue has been verified against a Cisco 7600
    w/ RSP720. Many thanks to Robert Blechinger for his extensive
    support.

0.11.4 -- 25-04-2007
  + support for TCP flags has been introduced. Flags are ORed on a
    per-aggregate basis (same as what NetFlow does on a per-flow
    basis). The 'aggregate' directive now supports the 'tcpflags'
    keyword. SQL tables v7 have also been introduced in order to
    support the feature inside the SQL plugins. 
  + 'nfacctd_sql_log' directive is being introduced. In nfacctd,
    it makes SQL plugins to use a) NetFlow's First Switched value
    as "stamp_inserted" timestamp and b) Last Switched value as
    "stamp_updated" timestamp. Then, a) by not aggregating flows
    and b) not making use of timeslots, this directive allows to
    log singular flows in the SQL database.
  + sfprobe and nfprobe plugins are now able to propagate tags to
    remote collectors through sFlow v5 and NetFlow v9 protocols. 
    The 'tag' key must be appended to sfprobe/nfprobe 'aggregate'
    config directives.
  + pmacct memory client is now able to output either TopN bytes,
    flows or packets statistics. The feature is enabled by a new
    '-T' commandline switch.
  + The Pre-Tagging map is now dynamically allocated and a new
    'pre_tag_map_entries' config directive allows to set the size
    of the map. Its default value (384) should be suitable for
    most common scenarios.
  ! Bugfix in nfprobe plugin: struct cb_ctxt was not initialized
    thus causing the application to exit prematurely (thinking it
    finished available memory). Thanks to Elio Eraseo for fixing
    the issue.
  ! Some misplaced defines were preventing 0.11.3 code to compile
    smoothly on OpenBSD boxes. Thanks to Dmitry Moshkov for fixing
    it.
  ! Bugfix in SQL handlers, MY_count_ip_proto_handler(): an array
    boundary was not properly checked and could cause the daemon
    to SEGV receiving certain packets. Thanks to Dmitry Frolov for 
    debugging and fixing the issue.
  ! NF_counters_renormalize_handler() renormalizes sampled NetFlow
    v5 flows. It now checks whether a positive Sampling Rate value
    is defined rather than looking for the Sampling Mode. It makes
    the feature working on Juniper routers. Thanks once again to
    Inge Bjornvall Arnesen.

0.11.3 -- 31-01-2007
  + 'aggregate_filter' directive now supports multiple pcap-style
    filters, comma separated. This, in turn, allows to bind up to
    128 filters to each activated plugin.
  + nfacctd and sfacctd turn-back time when restarting the daemon
    has been significantly improved by both creating new listening
    sockets with SO_REUSEADDR option and disassociating them first
    thing on receiving SIGINT signal. 
  + A new threaded version of pmacctd stream classification engine  
    is being introduced. Code status is experimental and disabled
    by default; it could be enabled by providing --enable-threads
    at configure time. Many thanks to Francois Deppierraz and Eneo
    Tecnologia for contributing this useful piece of code. 
  + A new 'flow_handling_threads' configuration directive allows to
    set the number of threads of the stream classification engine,
    by default 10.
  + A couple new '[ns]facctd_disable_checks' config directives aim
    to disable health checks over incoming NetFlow/sFlow streams
    (ie. in cases of non-standard vendor's implementations). Many 
    thanks to Andrey Chernomyrdin for his patch.
  ! sfv245_check_status() was running checks (ie. verify sequence
    numbers) using sender's IP address. More correctly, it has to
    look at the Agent Address field included in sFlow datagrams.
    Many thanks to Juraj Sucik for spotting the issue. 
  ! nfprobe plugin was not compiling properly in conjunction with
    --disable-l2 configure switch. Many thanks to Inge Bjornvall
    Arnesen for submitting the patch.
  ! sfacctd: fixed a bug which was preventing 'aggregate_filter'
    to match values properly in src_port, dst_port, ip proto and
    tos fields. Thanks to Chris Fletcher for spotting the issue.
  ! SQL cache: fixed a bug preventing safe actions to take place
    correctly. It has arisen in version 0.11.2 and hadn't severe
    impact.

0.11.2 -- 28-11-2006
  + 'sql_max_writers' configuration directive is being introduced:
    sets the maximum number of concurrent writer processes the SQL
    plugin can fire, allowing the daemon to degrade gracefully in
    case of major database unavailibility.
  + 'sql_history_since_epoch' is being introduced: enables the use
    of timestamps (stamp_inserted, stamp_updated) in the standard
    seconds since the Epoch format as an alternative to the default
    date-time format. 
  + 'sql_aggressive_classification' behaviour is changed: simpler
    more effective. It now operates by delaying cache-to-DB purge
    of unknown traffic streams - which would still have chances to
    be correctly classified - for a few 'sql_refresh_time' slots.
    The old mechanism was making use of negative UPDATE queries.
  + The way SQL writer processes are spawned by the SQL plugin has
    slightly changed in order to better exploit fork()'s copy-on-
    write behaviour: the writer now is mostly read-only while the
    plugin does most write operations before spawning the writer.
  ! The list of environment variables passed to the SQL triggers,
    'sql_trigger_exec', has been updated.
  ! Fixed a bug related to sequence number checks for NetFlow v5
    datagrams. Thanks very much to Peter Nixon for reporting it.

0.11.1 -- 25-10-2006
  + PostgreSQL plugin: 'sql_use_copy' configuration directive has
    been introduced; instructs the plugin to build non-UPDATE SQL
    queries using COPY (in place of INSERT). While providing same
    functionalities of INSERT, COPY is more efficient. It requires
    'sql_dont_try_update' to be enabled. Thanks to Arturas Lapiene
    for his support during the development.
  + nfprobe plugin: support for IPv4 ToS/DSCP, IPv6 CoS and MPLS
    top-most label has been introduced. 
  ! Some alignment issues concerning both pkt_extras structure and
    Core process to Plugins memory rings have been fixed. Daemons
    are now reported to be running ok on MIPS/SPARC architectures.
    Many thanks to Michal Krzysztofowicz for his strong support.
  ! sfprobe plugin: a maximum default limit of 256 bytes is set
    on packet payload copy when building Flow Samples in pmacctd
    (ie. if capturing full packets through libpcap, we don't want
    them to be entirely copied into sFlow datagrams).
  ! Sanity checks now take place when processing 'sql_refresh_time'
    values and error messages are thrown out.
  ! Fixes have been committed to IPv6 code in xflow_status.c as it
    was not compiling properly on both Solaris and IRIX.

0.11.0 -- 27-09-2006
  + NetFlow v5 sampling and renormalization are now supported:
    a) 'nfacctd' is able to renormalize bytes/packets counters and
    apply Pre-Tagging basing on the sampling rate specified in the
    datagram; b) 'sampling_rate' config key applies to 'nfprobe'
    plugin which is now able to generate sampling informations.
  + 'nfacctd' and 'sfacctd' are now able to give out informations
    about the status of active NetFlow/sFlow streams in terms of
    good/bad/missing datagrams. Whenever an anomaly happens (ie.
    missing or bad packets) a detailed message is logged; overral
    reports are logged by sending SIGUSR1 signals to the daemon. 
  + 'logfile' configuration directive is introduced: it allows to
    log directly to custom files. This adds to console and syslog
    logging options.
  ! Old renormalization structure, renorm_table, has been dropped;
    the new one, which applies to both NetFlow and sFlow, is tied
    into the brand new xflow_status_table structure. 
  ! When 'nfacctd_as_new' was not in use, NetFlow v5 src_as/dst_as
    values were erroneously swapped. Thanks to Thomas Stegbauer
    for reporting the bug.
  ! Incorrect timeout value for poll() has been fixed in 'sfprobe'
    plugin. It was leading the plugin to take too much resources.
  ! 'nfprobe' plugin was inserting jumps while generating sequence
    numbers.
  ! 'nfprobe' plugin behaviour in handling 'networks_file' content
    has been changed and now equals 'sfprobe': IP addresses which
    are not belonging to known networks/ASNs are no longer zeroed. 
  ! 'sfprobe' was not generating correct sample_pool values.
    
0.11.0rc3 -- 30-08-2006
  + 'sfprobe' plugin can now transport packet/flow classification
    tags inside sFlow v5 datagrams. Then, such tags can be read by
    the sFlow collector, sfacctd. 
  + 'sfprobe' plugin is able to encapsulate basic Extended Gateway
    informations (src_as, dst_as) into sFlow v5 datagrams starting
    from a Networks File - networks_file configuration directive.
  + 'nfprobe' now supports network data coming from libpcap/tcpdump
    style savefile ('pcap_savefile', -I). 
  + pmacctd is now able to capture packets from DLT_NULL, which is
    BSD loopback encapsulation link type. Thanks to Gert Burger for
    his support.
  + Sampling layer has been improved: it's now able to sample flows
    from NetFlow datagrams (not only packets arriving through sFlow
    or libpcap); 'sfprobe' sampling layer has been tied into this
    mechanism and as a result, 'sfprobe_sampling_rate' is now an
    alias for 'sampling_rate' and its default value is 1 (ie. no
    sampling). This change will benefit 'sfprobe' in terms of better
    efficiency.
  + A new 'pmacctd_flow_buffer_buckets' directive defines the number
    of buckets of the Flow Buffer. This value has to scale to higher
    power of 2 accordingly to the link traffic rate and is useful
    when packet classification is enabled. Many thanks for testing,
    debugging and support go to Steve Cliffe. 
  + A new 'sql_locking_style' directive allows to choose among two
    types of locking: "table" (default) and "row". More details are
    in the CONFIG-KEYS document. "row" locking has to be considered
    as experimental. Many thanks go to Aaron Glenn and Peter Nixon
    for their close support, work and thoughts.
  ! IPv6 support is now working; it was broken in 0.11.0rc2; thanks
    to Nigel Roberts for signalling and fixing the issue. 
  ! Fixed a few issues concerning the building system and related to 
    the introduction of some new subtrees. Thanks to Kirill Ponomarew
    and Peter Nixon for signalling them.
  ! Fixed some signal()-related issues when running the package under
    DragonflyBSD. Being fork of FreeBSD 4.x, it needs same cautions. 
    Thanks to Aaron Glenn for his support.

0.11.0rc2 -- 08-08-2006
  + 'nfprobe' plugin can now transport packet/flow classification
    tags inside NetFlow v9 datagrams, using custom field type 200.
    Then, such tags can be read by the NetFlow collector, nfacctd.  
  + 'nfprobe' plugin has now ability to select a Engine Type/Engine 
    ID through a newly introduced 'nfprobe_engine' config directive.
    It will mainly allow a collector to distinguish between distinct
    probe instances originating from the same IP address.
  + 'nfprobe' plugin now can automagically select different NetFlow
    v9 template IDs, useful when multiple 'nfprobe' plugins run as
    part of the same daemon instance. 
  + 'sfprobe' plugin is now able to redistribute NetFlow flows into
    sFlow samples. This adds to sFlow -> sFlow and libpcap -> sFlow.
  + A new data structure to pass extended data to specific plugins
    has been added. It is placed on the ring, next to pkt_data. It
    is meant to pass extra data to plugins and, same time, avoiding
    to inflate the main data structure.
  ! Wrong arguments were injected into a recently introduced Log()
    call in plugin_hooks.c; it's now fixed: under certain conditions,
    this was generating SEGV at startup while using 'sfprobe' plugin.  
  ! Updated documentation; examples and quickstart guides for using
    pmacct as both emitter and collector of NetFlow and sFlow have 
    been added.
  - Hooks to compile pmacct the no-mmap() style have been removed.

0.11.0rc1 -- 20-07-2006
  + pmacct DAEMONS ARE NOW ABLE TO CREATE AND EXPORT NETFLOW PACKETS:
    a new 'nfprobe' plugin is available and allows to create NetFlow
    v1/v5/v9 datagrams and export them to a IPv4/IPv6 collector. The
    work is based on softflowd 0.9.7 software. A set of configuration
    directives allows to tune timeouts (nfprobe_timeouts), cache size
    (nfprobe_maxflows), collector parameters (nfprobe_receiver), TTL
    value (nfprobe_hoplimit) and NetFlow version of the datagrams to
    be exported (nfprobe_version). Many thanks to Ivan A. Beveridge,
    Peter Nixon and Sven Anderson for their support and thoughts and
    to Damien Miller, author of softflowd.
  + pmacct DAEMONS ARE NOW ABLE TO CREATE AND EXPORT SFLOW PACKETS:  
    a new 'sfprobe' plugin is available and allows to create sFlow 
    v5 datagrams and export them to a IPv4 collector. The work is
    based on InMon sFlow Agent 5.6 software. A set of configuration
    directives allows to tune sampling rate (sfprobe_sampling_rate),
    sFlow agent IP address (sfprobe_agentip), collector parameters
    (sfprobe_receiver) and agentSubId value (sfprobe_agentsubid). 
    Many thanks to InMon for their software and Ivan A. Beveridge
    for his support.
  ! An incorrect pointer to the received packet was preventing Pre-
    Tagging filters to work correctly against DLT_LINUX_SLL links.
    Many thanks to Zhuang Yuyao for reporting the issue.
  ! Proper checks on protocol number were missing in pmacct client
    program, allowing to look further the bounds of the _protocols
    array. Many thanks to Denis N. Voituk for patching the issue.

0.10.3 -- 21-06-2006 
  + New Pre-Tagging key 'label': mark the rule with label's value.
    Labels don't need to be unique: when jumping, the first matching
    label wins. 
  + New Pre-Tagging key 'jeq': Jump on EQual. Jumps to the supplied
    label in case of rule match. Before jumping, the tagged flow is
    returned to active plugins, as it happens for any regular match
    (set return=false to change this). In case of multiple matches
    for a signle flow, plugins showing 'tag' key inside 'aggregate'
    directive will receive each tagged copy; plugins not receiving
    tags will still receive unique copy of the flow. 
    sFlow and NetFlow are usually uni-directional, ie. ingress-only
    or egress-only (to avoid duplicates). Meaningful application of
    JEQs is tagging flows two times: by incoming interface and by
    outgoing one. Only forward jumps are allowed. "next" is reserved
    label and causes to jump to the next rule. Many thanks to Aaron 
    Glenn for brainstormings about this point. 
  + New Pre-Tagging key 'return': if set to 'true' (which is default
    behaviour) returns the current packet/flow to active plugins, in
    case of match. If switched to 'false', it will prevent this to
    happen. It might be thought either as an extra filtering layer
    (bound to explicit Pre-Tagging rules) or (also in conjunction with
    'stack') as a way to add flexibility to JEQs.
  + New Pre-Tagging key 'stack': actually '+' (ie. sum symbol) is the
    unique supported value. This key makes sense only if JEQs are in
    use. When matching, accumulate IDs, using the specified operator/
    function. For example, usually <tag>=<currentID>. By setting
    'stack=+' you will be able to get <tag>=<previousID + currentID>.
  ! Pre-Tagging table now supports a maximum of 384 rules. Because
    of the newly introduced flow alteration features, tables are
    no longer internally re-ordered. However, IPv4 and IPv6 stacks
    are still segregated each other.

0.10.2 -- 16-05-2006
  + A new '-l' option is supported by pmacct client tool: it allows
    to enable locking of the memory table explicitely, when serving
    the requested operation. 
  + Pre-Tagging infrastructure is now featuring negations for almost
    all supported keys with the exclusion of id, ip and filter. To
    negate, the '-' (minus symbol) need to be prepended; eg.: id=X
    ip=Y in=-1 means tag with X, data received from Net/sFlow agent
    with IP address Y and not coming from interface 1.
  + pre_tag_filter config directive is now featuring same negation
    capabilities as Pre-Tagging infrastructure.
  + Q16 added to FAQS document: a sum of tips for running smoothly
    SQL tables. Many thanks to Wim Kerkhoff and Sven Anderson for
    bringing up the points. 

0.10.1 -- 18-04-2006
  + AS numbers and IP addresses are no more multiplexed into the same
    field. This ends the limitation of being unable to have both data
    types in the same table (which could be useful for troubleshooting
    purposes, for example). A new SQL table version, v6, is introduced
    in order to support this new data model in all SQL plugins.  
  ! Minor fixes to PostgreSQL table schemas, v2 to v5: a) the 'vlan'
    field was erroneously missing from primary keys, slowing down
    INSERT and UPDATE queries; b) primary keys were identified as
    'acct_pk', thus not allowing multiple tables of different version
    to share the same database; now constraint name is: 'acct_vX_pk',
    with X being the version number. Many thanks to Sven Anderson for
    catching the a)
  ! An alignment issue has been catched when the etheraddr_string() 
    gets called from count_src|dst_mac_handlers() in sql_handlers.c
    This seems to be closely connected to a similar trouble catched
    by Daniel Streicher on x86_64 recently.
  ! Fixed an issue with mask_elem() in server.c . Both src|dst_net
    primitives were not (positively, ie. copied back when required)
    masked.  

0.10.0 -- 22-03-2006
  + Collectors (ie. pmacctd) are now compiled exporting full Dynamic
    Symbol Table. This allows shared object (SO) classifiers to call
    routines included in the collector code. Moreover, a small set
    of library functions - specifically aimed to deal smoothly with
    the classifiers' table - are now included in the collector code:
    pmct_un|register(), pmct_find_first|last_free(), pmct_isfree(),
    pmct_get() and pmct_get_num_entries(). For further reading, take
    a look to README.developers document in classifiers tarball.
  + Classifiers table, which is the linked-list structure containing
    all the active classifiers (RE + SO), is now loaded into a shared
    memory segment, allowing plugins to keep updated about changes to
    the table. Furthermore, the table is now dynamically allocated at
    runtime, allowing an arbitrary number of classifiers to be loaded
    via the new 'classifier_table_num' configuration directive.
  + Pre-Tagging infrastructure adds two new primitives to tag network
    traffic: src_as and dst_as, the source and destination Autonomous
    System Number (ASN). In pmacctd they work against a Network Map
    ('networks_file' configuration directive). In nfacctd and sfacctd
    they work against both sFlow/NetFlow ASN fields and Network Maps.
    Many thanks to Aaron Glenn for his strong support.
  ! PostgreSQL plugin and pmpgplay no more make use of EXCLUSIVE LOCKS 
    whenever the sql_dont_try_update directive is activated. We assume
    there is no need for them in a INSERTs-only framework as integrity
    of data is still guaranteed by transactions. The patch has been
    contributed by Jamie Wilkinson, many thanks ! 
  ! Commandline switches and a configuration file should cohexist and
    the formers need to take precedence over the latter, if required.
    This is a rather standard (and definitely more flexible) approach;
    before this release they were mutual exclusive. Read UPGRADE notes
    at this propo. Thanks for the suggestion to Ivan A. Beveridge.
  ! Some glibc functions (noticeably syslog()) rely upon a rather non-
    standard "extern char *__progname" pointer. Now, its existence is
    properly checked at configuration time. On Linux, setproctitle()
    was causing plugin name/type to get cutted down in messages sent
    to the syslog facility. Thanks to Karl Latiss for his bug report.
  ! Solved a bug involving the load of IPv6 entries from Networks Maps.
    It was causing the count of such entries to be always zero.

0.10.0rc3 -- 01-03-2006
  + Aapplication layer (L7) classification capabilities of pmacctd have
    been improved: shared object (SO) classifiers have been introduced;
    they are loaded runtime through dlopen(). pmacct offers them support
    for contexts (informations gathered - by the same classifier - from
    previous packets either in the same uni-directional flow or in the
    reverse one), private memory areas and lower layer header pointers,
    resulting in extra flexibility. Some examples can be found at the
    webpage: http://www.ba.cnr.it/~paolo/pmacct/classification/ 
  + 'classifier_tentatives' configuration key has been added: it allows
    to customize the number of tentatives made in order to classify a
    flow. The default number is five, which has proven to be ok but for
    certain types of classification it might result restrictive.
  + 'pmacctd_conntrack_buffer_size' configuration key has been added: it
    (intuitively) defines the size for the connection tracking buffer.
  + Support for Token Ring (IEEE 802.5) interfaces has been introduced
    in pmacctd. Many thanks to Flavio Piccolo for his strong support. 
  + 'savefile_wait' (-W commandline) configuration key has been added: if 
    set to true causes pmacctd to not return but wait to be killed after
    being finished with the supplied savefile. Useful when pushing data
    from a tcpdump/ethereal tracefile into a memory table (ie. to build
    graphs).
  ! An erroneous replacement of dst with src in mask_elem() was causing
    queries like "pmacct -c dst_host -M|-N <IP address>" to return zero
    counters. Thanks to Ryan Sleevi for signalling the weird behaviour. 
  ! Management of the connection tracking buffer has been changed: now,
    a successful search frees the matched entry instead of moving it in
    a chain of stale entries, available for quick reuse.
  ! Error logging of SQL plugins has been somewhat improved: now, error
    messages returned by the SQL software are forwarded to sql_db_error() 
    This will definitely allow to exit from the obscure crypticism of
    some generic error strings.

0.10.0rc2 -- 14-02-2006
  + CONNECTION TRACKING modules has been introduced into pmacctd: they are
    C routines that hint IP address/port couples for upcoming data streams
    as signalled by one of the parties into the control channel whenever
    is not possible to go with a RE classificator. Conntrack modules for
    FTP, SIP and RTSP protocols are included.
  + 'pidfile' directive way of work has been improved: firstly, whenever 
    a collector shuts down nicely, it now removes its pidfile. Secondly,
    active plugins now create a pidfile too: it takes the following form:
    <pidfile>-<plugin type>.<plugin name>. Thanks to Ivan A. Beveridge
    for sharing his thoughts at this propo.
  ! Minor fixes to the classification engine: TCP packets with no payload
    are not considered useful classification tentatives; a new flow can
    inherit the class of his reverse flow whenever it's still reasonably
    valid.
  ! Solved a segmentation fault issue affecting the classificator engine,
    whenever the 'snaplen' directive was not specified. Thanks to Flavio
    Piccolo for signalling it.
  ! Fixed a bug in the PostgreSQL plugin: it appeared in 0.10.0rc1 and was
    uniquely related to the newly introduced negative UPDATE SQL query.  
  ! INTERNALS has been updated with few notes about the new classification
    and connection tracking features. 

0.10.0rc1 -- 24-01-2006
  + PACKET CLASSIFICATION capabilities have been introduced into pmacctd:
    the implemented approach is fully extensible: classification patterns
    are based on regular expressions (RE), human-readable, must be placed
    into a common directory and have a .pat file extension. Many patterns
    for widespread protocols are available at L7-filter project homepage. 
    To support this feature, a new 'classifiers' configuration directive
    has been added. It expects full path to a spool directory containing
    the patterns.
  + A new 'sql_aggressive_classification' directive has been added aswell:
    it allows to move unclassified packets even in the case they are no
    more cached by the SQL plugin. This aggressive policy works by firing
    negative UPDATE SQL queries that, whenever successful, are followed
    by positive ones charging the extra packets to their final class.
  ! Input and Output interface fields (Pre-Tagging) have been set to be  
    32 bits wide. While NetFlow is ok with 16 bits, some sFlow agents are
    used to bigger integer values in order to identify their interfaces.
    The fix is courtesy of Aaron Glenn. Thank you. 
  ! Flow filtering troubles have been noticed while handling MPLS-tagged
    flows inside NetFlow v9 datagrams. Thanks to Nitzan Tzelniker for his
    cooperation in solving the issue.
  ! A new exit_all() routine now handles nicely fatal errors detected by
    the Core Process, after plugins creation. It avoids leaving orphan
    plugins after the Core Process shutdown.

0.9.6 -- 27-Dec-2005
  + Support for 'sql_multi_values' has been introduced into the new SQLite
    3.x plugin. It allows to chain multiple INSERT queries into a single
    SQL statement. The idea is that inserting many rows at the same time
    is much faster than using separate single-row statements.
  ! MySQL plugin fix: AS numbers were sent to the database unquoted while 
    the corresponding field was declared as CHAR. By correctly wrapping AS
    numbers, a major performance increase (expecially when UPDATE queries
    are spawned) has been confirmed. Many thanks to Inge Bjørnvall Arnesen
    for discovering, signalling and solving the issue.
  ! MySQL plugin fix: multi-values INSERT queries have been optimized by
    pushing out of the queue purging loop the proper handling for the EOQ
    event.
  ! The introduction of the intermidiate SQL layer in the 0.9.5 version
    choked the dynamic SQL table creation capability. This has been fixed.
    Thanks to Vitalij Brajchuk for promptly signalling the issue. 
  ! The 'pidfile' configuration key has got incorrectly disabled in both 
    nfacctd and sfacctd. Thanks to Aaron Glenn for signalling the issue.
  ! The 'daemonize' (-D) configuration key was incorrectly disabling the
    signal handlers from the Core Process once backgrounded. As a result
    the daemon was not listening for incoming SIGINTs. Again, many thanks 
    go to Aaron Glenn.
 
0.9.5 -- 07-Dec-2005
  + PMACCT OPENS TO SQLITE 3.x: a fully featured SQLite, version 3.x only,
    plugin has been introduced; SQLite is a small C library that implements
    a self-contained, embeddable, zero-configuration SQL (almost all SQL92)
    database engine. The plugin is LOCK-based and supports the "recovery
    mode" via an alternate database action. Expecially suitable for tiny
    and embedded environments. The plugin can be fired using the keyword
    'sqlite3'. See CONFIG-KEYS and EXAMPLES for further informations. 
  + A new SQL layer - common to MySQL, PostgreSQL and SQLite plugins - has
    been introduced. It's largely callback-based and results in a major
    architectural change: it sits below the specific SQL code (facing the
    Core Process's abstraction layer) and will (hopefully) help in reducing
    potential bugs and will allow for a quick implementation of new SQL
    plugins.
  ! A bug concerning the setup of insert callback functions for summed (in
    + out) IPv6 traffic has been fixed. The issue was affecting all SQL
    plugins. 
  ! A bug concerning the handling of MPLS labels has been fixed in pmacctd.
    Many thanks to Gregoire Tourres and Frontier Online for their support.

0.9.4p1 -- 14-Nov-2005
  ! Minor bugfix in pretag.c: a wrongly placed memcpy() was preventing the
    code to be compiled by gcc 2.x . Many thanks to Kirill Ponomarew and
    Kris Kennaway for signalling the issue.
  ! Fixed an alignment issue revealed in the query_header structure; it has
    been noticed only under some circumstances: '--enable-64bit' enabled,
    64bit platform and gcc 3.x . Many thanks to Aaron Glenn for his strong
    support in solving the issue.

0.9.4 -- 08-Nov-2005
  + Hot map reload has been introduced. Maps now can be modified and then
    reloaded without having to stop the daemon. SIGUSR2 has been reserved for
    this use. The feature applies to Pre-Tagging map (pre_tag_map), Networks
    map (networks_file) and Ports map (ports_file). It is enabled by default
    and might be disabled via the new 'refresh_maps' configuration directive.
    Further details are in CONFIG-KEYS. 
  ! Some major issues have been solved in the processing of libpcap-format
    savefiles. Some output inconsistencies were caused by a corruption of the
    pcap file handler; bufferization is now enabled by default and the last
    buffer is correctly processed. Many thanks go to Amir Plivatsky for his
    strong support.  
  ! 'sql_table_schema' directive: in read_SQLquery_from_file() the strchr()
    has been replaced by strrchr() allowing to chain more SQL statements as
    part of the SQL table creation. This results useful, for example, to do
    CREATE INDEX after CREATE TABLE. The patch is courtesy of Dmitriy Nikulin. 
  ! SIGTERM signal is now handled properly to ensure a better compatibility
    of all pmacct daemons under the daemontools framework. The patch is
    courtesy of David C. Maple.
  ! Memory plugin: some issues caused by the mix of not compatible compilation
    parameters have been fixed. Now the pmacct client now correctly returns a
    warning message if: counters are of different size (32bit vs 64bit) or IP
    addresses are of different size (IPv4-only vs IPv6-enabled packages). 
  ! Print plugin, few bugfixes: the handling of the data ring shared with the
    Core Process was not optimal; it has been rewritten. P_exit() routine was
    not correctly clearing cached data. 

0.9.3 -- 11-Oct-2005
  + IPv4/IPv6 multicast support has been introduced in the NetFlow (nfacctd)
    and the sFlow (sfacctd) daemons. A maximum of 20 multicast groups may be
    joined by a single daemon instance. Groups can be defined by using the two
    sister configuration keys: nfacctd_mcast_groups and sfacctd_mcast_groups. 
  + sfacctd: a new 'sfacctd_renormalize' config key allows to automatically 
    renormalize byte/packet counters value basing on informations acquired
    from the sFlow datagram. In particular, it allows to deal with scenarios
    in which multiple interfaces have been configured at different sampling
    rates. It also calculates an effective sampling rate which could differ
    from the configured one - expecially at high rates - because of various
    losses. Such estimated rate is then used for renormalization purposes.
    Many thanks go to Arnaud De-Bermingham and Ovanet for the strong support
    offered during the development.
  + sfacctd: a new 'sampling_rate' keyword is supported into the Pre-Tagging 
    layer. It allows to tag aggregates - generated from sFlow datagrams - on
    a sampling rate basis. 
  + setproctitle() calls have been introduced (quite conservatively) and are
    actually supported on Linux and BSDs. The process title is rewritten in
    the aim of giving the user more informations about the running processes
    (that is, it's not intended to be just a cosmetic stuff).
  ! sql_preprocess tier was suffering a bug: actions (eg. usrf, adjb), even
    if defined, were totally ignored if no checks were defined aswell. Many
    thanks to Draschl Clemens for signalling the issue.
  ! Some minor bugs have been catched around sfacctd and fixed accordingly.
    Again, many thanks to Arnaud De-Bermingham.

0.9.2 -- 14-Sep-2005
  + A new 'usrf' keyword is now supported into the 'sql_preprocess' tier: it
    allows to apply a generic uniform renormalization factor to counters. Its
    use is particularly suitable for use in conjunction with uniform sampling
    methods (for example simple random - e.g. sFlow, 'sampling_rate' directive
    or simple systematic - e.g. sampled NetFlow by Cisco and Juniper). 
  + A new 'adjb' keyword is now supported into the 'sql_preprocess' tier: it
    allows to add (or subtract in case of negative value) 'adjb' bytes to the
    bytes counter. This comes useful when fixed lower (link, llc, etc.) layer 
    sizes need to be included into the bytes counter (as explained by the Q7
    in the updated FAQS document).
  + A new '--enable-64bit' configuration switch allows to compile the package
    with byte/packet/flow counters of 64bit (instead of the usual 32bit ones). 
  ! The sampling algorithm endorsed by the 'sampling_rate' feature has been 
    enhanced to a simple randomic one (it was a simple systematic). 
  ! Some static memory structures are now declared as constants allowing to
    save memory space (given the multi-process architecture) and offering an
    overral better efficiency. The patch is courtesy of Andreas Mohr. Thanks.
  ! Some noisy compiler warnings have been troubleshooted along with some minor
    code cleanups; the contribution is from Jamie Wilkinson. Thanks.
  ! Some unaligned pointer issues have been solved. 

0.9.1 -- 16-Aug-2005
  + Probabilistic, flow size dependent sampling has been introduced into the
    'sql_preprocess' tier via the new 'fss' keyword: it is computed against
    the bytes counter and returns renormalized results. Aggregates which have
    collected more than the 'fss' threshold in the last time window are
    sampled. Those under the threshold are sampled with probability p(bytes). 
    For further details read the CONFIG-KEYS and the paper:
    - N.G. Duffield, C. Lund, M. Thorup, "Charging from sampled network usage"
      http://www.research.att.com/~duffield/pubs/DLT01-usage.pdf
  + Probabilistic sampling under hard resource constraints has been introduced
    into the 'sql_preprocess' tier via the new 'fsrc' keyword: it is computed
    against the bytes counter and returns renormalized results. The method
    selects only 'fsrc' flows from the set of the flows collected during the
    last time window, providing an unbiasied estimate of the real bytes counter.
    For further details read the CONFIG-KEYS and the paper:
    - N.G. Duffield, C. Lund, M. Thorup, "Flow Sampling Under Hard Resource Constraints"
      http://www.research.att.com/~duffield/pubs/DLT03-constrained.pdf
  + A new 'networks_mask' configuration directive has been introduced: it
    allows to specify a network mask - in bits - to be applied apply to src_net
    and dst_net primitives. The mask is applied before evaluating the content of 
    'networks_file' (if any).
  + Added a new signal handler for SIGUSR1 in pmacctd: a 'killall -USR1 pmacctd'
    now returns a few statistics via either console or syslog; the syslog level
    reserved for such purpose is the NOTICE. 
  ! sfacctd: an issue regarding non-IP packets has been fixed: some of them
    (mainly ARPs) were incorrectly reported. Now they are properly filtered out. 
  ! A minor memory leak has been fixed; it was affecting running instances of
    pmacctd, nfacctd and sfacctd with multiple plugins attached. Now resources
    are properly recollected. 

0.9.0 -- 25-Jul-2005
  + PMACCT OPENS TO sFlow: support for the sFlow v2/v4/v5 protocol has been
    introduced and a new daemon 'sfacctd' has been added. The implementation
    includes support for BGP, MPLS, VLANs, IPv4, IPv6 along with packet tagging,
    filtering and aggregation capabilities. 'sfacctd' makes use of Flow Samples
    exported by a sFlow agent while Counter Samples are skipped and the MIB is
    ignored. All actually supported backends are available for storage: MySQL,
    PostgreSQL and In-Memory tables. http://www.sflow.org/products/network.php
    lists the network equipments supporting the sFlow protocol.
  + A new commandline option '-L' is now supported by 'nfacctd' and 'sfacctd';
    it allows to specify an IPv4/IPv6 address where to bind the daemon. It is
    the equivalent for the 'nfacctd_ip' and 'sfacctd_ip' configuration directives. 
  ! The NetFlow v9 MPLS stack handler has been fixed; it now also sticks the BoS
    bit (Bottom of the Stack) to the last processed label. This makes the flow
    compliant to BPF filters compiled by the newly released libpcap 0.9.3. 
  ! Some Tru64 compilation issues related to the ip_flow.[c|h] files have been
    solved. 
  ! Some configuration tests have been added; u_intXX_t definitions are tested
    and fixed (whenever possible, ie. uintXX_t types are available). Particularly
    useful on Solaris and IRIX platforms.
  ! Configuration hints for MySQL headers have been enhanced. This will ease the
    compilation of pmacct against MySQL library either from a precompiled binary
    distribution or from the FreeBSD ports. Many hhanks for the bug report go to
    John Von Essen. 
  ! NetFlow v8 source/destination AS handlers have been fixed. 

0.8.8 -- 27-Jun-2005
  + Added IP flows support in pmacctd (release 0.8.5 has seen its introduction
    in nfacctd) for both IPv4 and IPv6 handlers. To enable flows accounting,
    the 'aggregate' directive now supports a new 'flows' keyword. The SQL table
    v4 has to be used in order to support this feature in both SQL plugins.
  + A new 'sum_mac' aggregation method has been added (this is in addition to
    the already consolidated ones: 'sum_host', 'sum_net', 'sum_as', 'sum_port').
    Sum is intended to be the total traffic (inbound traffic summed to outbound
    one) produced by a specific MAC address.
  + Two new configuration directives have been introduced in order to set an 
    upper bound to the growth of the fragment (default: 4Mb) and flow (default:
    16Mb) buffers: 'pmacctd_frag_buffer_size', 'pmacctd_flows_buffer_size'.
  + A new configuration directive 'pmacctd_flow_lifetime' has been added and 
    defines how long a flow could remain inactive (ie. no packets belonging to
    such flow are received) before considering it expired (default: 60 secs).
    This is part of the pmacctd IP flows support.
  + Console/syslog feedbacks about either generic errors or malformed packets
    have been greatly enhanced. Along with the cause of the message, now any
    generated message contains either the plugin name/type or the configuration
    file that is causing it. 
  ! nfacctd: when IPv6 is enabled (on non-BSD systems) the daemon now listens
    by default on a IPv6 socket getting rid of the v4-in-v6 mapping feature which
    helps in receiving NetFlow datagrams from both IPv4 and IPv6 agents. A new
    configure script switch --enable-v4-mapped is aimed to turn manually on/off
    the feature.
  ! Fixed an issue with the SIGCHLD handling routine on FreeBSD 4.x systems. It
    was causing the sudden creation of zombie processes because of the not correct
    retirement of exited childs. Many thanks for his bug report and strong support
    go to John Von Essen.
  ! Fixed an endianess issue regarding Solaris/x86 platforms caused by not proper
    preprocessor tests. Many thanks to Imre Csatlos for his bug report. 
  ! Fixed the default schema for the PostgreSQL table v4. The 'flows' field was
    lacking of the 'DEFAULT 0' modifier; it was causing some troubles expecially
    when such tables were used in conjunction with the 'sql_optimize_clauses'
    directive. Many thanks for his bug report and strong support go to Anik Rahman. 

0.8.7 -- 14-Jun-2005
  + pmacctd: MPLS support has been introduced. MPLS (on ethernet and ppp links)
    and MPLS-over-VLAN (ethernet only) packets are now supported and passed to
    upper layer routines. Filtering and tagging (Pre-Tagging) packets basing on
    MPLS labels is also supported. Recent libpcap is required (ie, CVS versions
    >= 06-06-2005 are highly adviceable because of the support for MPLS label
    hierarchies like "mpls 100000 and mpls 1024" that will match packets with 
    an outer label of 100000 and an inner label of 1024).  
  + nfacctd: VLAN and MAC addresses support for NetFlow v9 has been introduced.
    Each of them is mapped to its respective primitive (vlan, src_mac, dst_mac);
    filtering and tagging (Pre-Tagging) IPv4/IPv6 flows basing on them is also
    supported.
  + nfacctd: filtering and tagging (Pre-Tagging) IPv4/IPv6 flows basing on MPLS
    labels has been introduced (read the above notes regarding libpcap version
    requirements).
  + A new packet capturing size option has been added to pmacctd ('snaplen'
    configuration directive; '-L' commandline). It allows to change the default
    portion of the packet captured by the daemon. It results useful to cope 
    with not fixed protocol stacks (ie, the MPLS stack).
  + pmacctd: CHDLC support has been introduced. IPv4, IPv6 and MPLS packets are
    supported on this link layer protocol.
  ! Cleanups have been added to the NetFlow packet processing cycle. They are
    mainly aimed to ensure that no stale data is read from circular buffers 
    when processing NetFlow v8/v9 packets. 
  ! The NetFlow v9 VLAN handling routine was missing a ntohs() call, resulting
    in an ncorrect VLAN id on little endian architectures.  
  ! ether_aton()/ether_ntoa() routines were generating segmentation faults on
    x86_64 architectures. They have been replaced by a new handmade couple:
    etheraddr_string()/string_etheraddr(). Many thanks to Daniel Streicher for
    the bug report.  

0.8.6 -- 23-May-2005
  + The support for dynamic SQL tables has been introduced through the use of
    the following variables in the 'sql_table' directive: %d (the day of the
    month), %H (hours using an 24 hours clock), %m (month number), %M (minutes),
    %w (the day of the week as a decimal number), %W (week number in the current
    year) and %Y (the current year). This enables, for example, substitutions
    like the following ones:
      'acct_v4_%Y%m%d_%H%M'	==> 	'acct_v4_20050519_1500'
      'acct_v4_%w'		==> 	'acct_v4_05'
  + A new 'sql_table_schema' configuration directive has been added in order
    to allow the automatic creation of dynamic tables. It expects as value the
    full pathname to a file containing the schema to be used for table creation.
    An  example of the schema follows:
      CREATE TABLE acct_v4_%Y%m%d_%H%M (
        ... PostgreSQL/MySQL specific schema ...
      );
  + Support for MySQL multi-values INSERT clauses has been added. Inserting
    many rows in a single shot has proven to be much faster (many times faster
    in some cases) than using separate single INSERT statements. A new
    'sql_multi_values' configuration directive has been added to enable this
    feature. Its value is intended to be the size (in bytes) of the multi-values
    buffer. Out of the box, MySQL >= 4.0.x supports values up to 1024000 (1Mb).
    Because it does not require any changes on server side, people using MySQL
    are strongly encouraged to give it a try.
  + A new '--disable-l2' configure option has been added. It is aimed to compile 
    pmacct without support for Layer-2 stuff: MAC addresses and VLANs. This
    option - along with some more optimizations to memory structures done in this
    same release - have produced memory savings up to 25% compared to previous
    versions. 
  ! Recovery code for PostgreSQL plugin has been slightly revised and fixed.

0.8.5 -- 04-May-2005
  + Added IP flows counter support in nfacctd, the NetFlow accounting daemon,
    in addition to the packets and bytes ones. To enable flows accounting, the
    'aggregate' directive now supports a new 'flows' keyword. A new SQL table
    version, v4, has been also introduced to support this feature in both SQL
    plugins. 
  + 'sql_preprocess' directive have been strongly improved by the addition of
    new keywords to handle thresholds. This preprocessing feature is aimed to 
    process aggregates (via a comma-separated list of conditionals and checks)
    before they are pulled to the DB, thus resulting in a powerful selection
    tier; whether the check is meet, the aggregate goes on its way to the DB;
    the new thresholds are: maxp (maximum number of packets), maxb (maximum bytes
    transferred), minf/maxf (minimum/maximum number of flows), minbpp/maxbbp
    (minimum/maximum bytes per packet average value), minppf/maxppf (minimum/
    maximum packets per flow average value). 
  + Added a new 'sql_preprocess_type' directive; the values allowed are 'any'
    or 'all', with 'any' as default value. It is intended to be the connective
    whether 'sql_preprocess' contains multiple checks. 'any' requires that an
    aggregate has to match just one of the checks in order to be valid; 'all'
    requires a match against all of the checks instead.
  + Added the ability to instruct a BPF filter against the ToS field of a NetFlow
    packet.  
  ! Minor optimizations on the 'sql_preprocess' handler chain.

0.8.4 -- 14-Apr-2005
  + Added support for NetFlow v7/v8. The Version 7 (v7) format is exclusively
    supported by Cisco Catalyst series switches equipped with a NetFlow feature
    card (NFFC). v7 is not compatible with Cisco routers. The Version 8 (v8)
    format adds (with respect to older v5/v7 versions) router-based aggregation
    schemes.
  + Added the chance to tag packets basing on NetFlow v8 aggregation type field. 
    As the keyword suggests, it will work successfully just when processing  
    NetFlow v8 packets. Useful to split - backend side - data per aggregation
    type. 
  + pmacct client now is able to ask for the '0' (that is, untagged packets) tag
    value. Moreover, all 'sum' aggregations (sum_host, sum_net, sum_as, sum_port)
    can now be associated with both Pre/Post-Tagging.  
  ! Fixed a serious memory leak located in the routines for handling NetFlow v9
    templates. While the bug was needing certain conditions to manifest, anyone
    using NetFlow v9 is strongly encouraged to upgrade to this version. All
    previous versions were affected.
  ! Some gcc4 compliance issues have been solved. The source code is known to
    work fine on amd64 architectures. Thanks very much to Marcelo Goes for his
    patch.
  ! Engine Type/Engine ID fields were not correctly evaluated when using NetFlow
    v5 and Pre-Tagging. The issue has been fixed.
  ! Long comments in the Ports Definition File were causing some incorrect error
    messages. However it seems the file were processed correctly. Thanks to Bruno
    Mattarollo for signalling the issue.
  ! Minor fix to plugins hooking code. The reception of sparse SIGCHLD signals 
    were causing the poll() to return. The impact was null. The issue has been
    fixed by ignoring such signals. 

0.8.3 -- 29-Mar-2005
  + Pre-Tagging capabilities have been further enhanced: captured traffic can
    be now marked basing on the NetFlow nexthop/BGP nexthop fields. While the
    old NetFlow versions (v1, v5) carry an unique 'nexthop' field, NetFlow v9
    supports them into two distinguished fields. 
  + Packet/flows tagging is now explicit, gaining more flexibility: a new 'tag'
    keyword has been added to the 'aggregate' directive. It causes the traffic
    to be actually marked; the 'pre_tag_map' and 'post_tag' directives now just
    evaluate the tag to be assigned. Read further details about this topic in
    the UPGRADE document.
  + The 'pre_tag_filter' directive now accepts 0 (zero) as valid value: we have 
    to remember that zero is not a valid tag; hence, its support allows to split
    or filter untagged traffic from tagged one. 
  + Documentation has been expanded: a new FAQS entry now describes few and easy
    tweaks needed to replace the bytes counter type from u_int32_t to u_int64_t
    throughout the code (provided that the OS supports this type); it's useful
    in conjunction with the In-Memory plugin while exposed to very sustained
    traffic loads. A new FAQS entry describes the first efforts aimed to integrate
    pmacctd with popular flow-tools software by the way of the flow-export tool.
    A new UPGRADE document has been also created. 
  ! pmacct client was handling counters returned by the '-N' switch as signed
    integers, which is not correct. The issue has been fixed. Many thanks to
    Tobias Bengtsson for signalling it. 
  ! Two new routines file_lock()/file_unlock() have replaced the flock() calls
    because they were preventing the pmacct code to compile on Solaris. Basing
    over hints collected at configure time, the routines enable either the flock()
    or fcntl() code. Many thanks to Jan Baumann for signalling and solving the
    issue. 


0.8.2 -- 08-Mar-2005
  + Pre-Tagging capabilities have been enhanced: now, a Pre Tag Map allows to
    mark either packets or flows basing on the outcome of a BPF filter. Because
    of this new feature, Pre-tagging has been introduced in 'pmacctd' too.
    Pre-tagging was already allowing 'nfacctd' to translate some NetFlow packet
    fields (exporting agent IP address, Input/Output interface, Engine type and
    Engine ID) into an ID (also referred as 'tag'), a small number in the range
    1-65535. 
  + A new 'pmacctd_force_frag_handling' configuration directive has been added;
    it aims to support 'pmacctd' Pre-Tagging operations: whether the BPF filter
    requires tag assignation based on transport layer primitives (e.g. src port
    or dst port), this directive ensures the right tag is stamped to fragmented
    traffic too. 
  + Pre Tag filtering (which can be enabled via 'pre_tag_filter' configuration
    directive) allows to filter aggregates basing on the previously evaluated 
    ID: whether it matches with at least one of the filter values, the aggregate
    is delivered to the plugin. It has been enhanced by allowing to assign more 
    tags to a specific plugin. 
  + pmacctd: a new feature to read libpcap savefiles has been added; it can be
    enabled either via the 'pcap_savefile' configuration directive or the '-I'
    commandline switch. Files need to be already closed and correctly finalized
    in order to be read successfully. Many thanks to Rafael Portillo for proposing
    the idea.
  + pmacct client tool supports a new 'tag' keyword as value for the '-c' switch:
    it allows to query the daemon requesting a match against aggregate tags.  
  + pmacct client: the behaviour of the '-N' switch (which makes the client to
    return a counter onto the screen suitable for data injection in tools like MRTG,
    Cacti, RRDtool, etc.), has been enhanced: it was already allowing to ask data
    from the daemon but basing only on exact matches. This concept has now extended,
    adding both wildcarding of specific fields and partial matches. Furthermore,
    when multiple requests are encapsulated into a single query, their results are
    by default splitted (that is, each request has its result); a newly introduced
    '-S' switch now allows to sum multiple results into a single counter.
  ! Bugfix: proper checks for the existence of a 'pre_tag_map' file were bypassed
    under certain conditions; however, this erroneous behaviour was not causing any
    serious issue. The correct behaviour is to quit and report the problem to the
    user. 
  ! The sampling rate algorithm has been fixed from a minor issue: it was returning
    not expected results when 'sampling_rate: 1'. It now works as expected. Thanks
    to David C. Maple for his extensive support in gaining a better understanding
    of the problem. 

0.8.1p1 -- 22-Feb-2005
  ! 'sum_host' and 'sum_net' compound primitives have been fixed in order to
    work with IPv6 addresses.
  ! In-Memory Plugin: client queries spotted with both '-r' (reset counters) and
    '-N' (exact match, print counters only) switches enabled were causing the
    daemon to crash whether no entries were found. The problem has been fixed.
    Many thanks to Zach Chambers for signalling the issue.
  ! In-Memory Plugin: client queries spotted with either '-M' or '-N' switches
    enabled were failing to match actual data when either 'sum_host', 'sum_net' 
    or 'sum_as' primitives were in use. The issue has been fixed. 
  ! The modulo function applied to NetFlow v9 Template Cache has been enhanced
    in order to deal correctly with export agents having an IPv6 address. 
  ! Networks/AS definition file: a new check has been added in order to verify 
    whether network prefix/network mask pairs are compatible: if they are not,
    the mask is applied to the prefix. 
  ! Documentation has been expanded and revised.

0.8.1 -- 25-Jan-2005
  + Accounting and aggregation over DSCP, IPv4 ToS field and IPv6 traffic class
    field have been introduced ('aggregate' directive, 'tos' value): these fields
    are actually widely used to implement Layer-3 QoS policies by defining new
    classes of service (most noticeably 'Less than Best Effort' and 'Premium IP').
    MySQL and PostgreSQL tables v3 (third version) have been introduced (they
    contain an additional 4-bytes 'tos' field) to support the new Layer-3 QoS
    accounting.
  + nfacctd core process has been slightly optimized: each flow is encapsulated
    (thus, copied field-by-field) into a BPF-suitable structure only if one or
    more plugins actually require BPF filtering ('aggregate_filter' directive).
    Otherwise, if either filtering is not required or all requested filters fail
    to compile, the copy is skipped. 
  + 'pmacct', pmacct client tool: '-e' commandline option (which meaning is:
    full memory table erase) now might be supplied in conjunction with other
    options (thus avoiding the short time delays involved by two consecutive
    queries, ask-then-erase, which may also lead to small losses).
    The new implemented mechanism works as follow: queries over actual data
    (if any) are served before; the table is locked, new aggregates are queued
    until the erasure finishes (it may take seconds if the table is large enough);
    the table is unlocked; the queue of aggregates is processed and all normal
    operations are resumed. Many thanks to Piotr Gackiewicz for the valuable
    exchange of ideas.
  ! Bug fixed in nfacctd: source and destination AS numbers were incorrectly
    read from NetFlow packets. Thanks to Piotr Gackiewicz for his support. 
  ! Bug fixed in pmacct client: while retrieving the whole table content was
    displaying espected data, asking just for 'dst_as' field was resulting in
    no results instead. Thanks, once more, to Piotr Gackiewicz. 


0.8.0 -- 12-Jan-2005
  + PMACCT OPENS TO IPv6: IPv6 support has been introduced in both 'pmacctd' 
    and 'nfacctd' daemons. Because it requires larger memory structures to
    store its addresses, IPv6 support has been disabled by default. It could
    be enabled at configure time via '--enable-ipv6' switch. All filtering,
    tagging and mapping functions already support IPv6 addresses. Some notes 
    about IPv6 and SQL table schema have been dropped into README.IPv6 file,
    sql section of the tarball. 
  + PMACCT OPENS TO NetFlow v9: support for the template-based Cisco NetFlow
    v9 export protocol has been added. NetFlow v1/v5 were already supported.
    'nfacctd' may now be bound to an IPv6 interface and is able to read both
    IPv4 and IPv6 data flowsets. A single 'nfacctd' instance may read flows
    of different versions and coming from multiple exporting agents. Source
    and destination MAC addresses and VLAN tags are supported in addition to
    the primitives already supported in v1/v5 (source/destination IP addresses,
    AS, ports and IP protocol). Templates are cached and refreshed as soon as
    they are resent by the exporting agent.  
  + Pre Tag map ('pre_tag_map' configuration key), which allows to assign a
    small integer (ID) to an incoming flow basing on NetFlow auxiliar data,
    now may apply tags basing also over Engine Type (it provides uniqueness
    with respect to the routing engine on the exporting device) and Engine
    ID (it provides uniqueness with respect to the particular line card or
    VIP on the exporting device) fields. Incoming and Outcoming interfaces
    were already supported. See 'pretag.map.example' into tarball examples
    section and CONFIG-KEYS document for further details. 
  + Raw protocol (DLT_RAW) routine has been added; it usually allows to read
    data from tunnels and sitX devices (used for IPv6-in-IPv4 encapsulation).
  + Some tests for architecture endianess, CPU type and MMU unaligned memory
    access capability have been added. A small and rough (yes, they work the
    hard way) set of unaligned copy functions have been added. They are aimed
    to be introduced through the code, however first tests over MIPS R10000
    and Alpha EV67 (21264A) have shown positive results.  
  ! PPPoE and VLAN layer handling routines have been slightly revised for some
    additional checks. 
  ! Given the fairly good portability reported from the mmap() code introduced
    through the whole 0.7.x development stage, the use of shared memory segments
    is now enabled by default. The configure switch '--enable-mmap' has been
    replaced by '--disable-mmap'. 
  ! 'pmacct' client tool: because of the IPv6 addresses introduction, separator 
    character for multiple queries (commandline) have been changed to from
    ':' to ';'. 
  ! 'nfacctd': '-F' commandline switch was listed into available options list,
    but getopt() stanza was missing, thus returning an invalid option message.
    Thanks to Chris Koutras for his support in fixing the issue.
  ! Some variable assignations were causing lvalue errors with gcc 4.0. Thanks
    to Andreas Jochens for his support in signalling and solving the problem. 

0.7.9 -- 21-Dec-2004
  + A new data pre-processor has been introduced in both SQL plugins: it
    allows to filter out data (via conditionals, checks and actions) during
    a cache-to-DB purging event, before building SQL queries; this way, for
    example, aggregates which have accounted just a few packets or bytes may
    be either discarded or saved through the recovery mechanism (if enabled).
    The small set of preprocessing directives is reported into CONFIG-KEYS
    document. 
  + Some new environment variables are now available when firing a trigger
    from SQL plugins: $EFFECTIVE_ELEM_NUMBER reports the effective number
    of aggregates (that is, excluding those filtered out at preprocessing
    time) encapsulated in SQL queries; $TOTAL_ELEM_NUMBER reports the total
    number of aggregates instead.
    $INSERT_QUERIES_NUMBER and $UPDATE_QUERIES_NUMBER returns respectively
    the number of aggregates being successfully encapsulated into INSERT
    and UPDATE queries. $ELAPSED_TIME reports the time took to complete
    the last purging event. For further details and the list of supported
    environment variables take a look to TRIGGER_VARS document.
  + Some additions to both logfile players: a new '-n' switch allows to play
    N elements; this way, arbitrary portions of the file may be played using
    '-n' in conjunction with the (already existing) '-o' switch which allows
    to read the logfile starting at a specified offset. New switches '-H',
    '-D', '-T', '-U', '-P' have been introduced to override SQL parameters
    like hostname, DB, table, user and password. The '-t -d' combination
    (test only, debug) now allows to print over the screen the content of
    the logfile.
  + Logfiles size is now limited to a maximum of 2Gb, thus avoiding issues
    connected to the 32bit declaration of off_t. While many OS implment a
    solution to the problem, seems there are few chances to solve it in a
    portable way. When the maximum size is hit the old logfile is rotated
    appending to its filename a trailing small integer ( in a way similar
    to logrotate) and a fresh one is started.
  ! Logfile players: '-s' switch, which was allowing to play one element
    a time, has been superseded. Its current equivalent is: '-n 1'. 
  ! The file opening algorithm has been slightly changed in SQL plugins:
    flock() follows shortly the fopen() and all subsequent operations and
    evaluations are thus strictly serialized. freopen() is avoided. 

0.7.8 -- 02-Dec-2004
  + Recovery logfile structure has been enhanced. Following the logfile
    header has been created a new template structure. Templates will avoid 
    the issue of being not able to read old logfiles because of changes to
    internal data structures. Templates are made of an header and a number
    of entries, each describing a single field of the following data.
    Both players, pmmyplay and pmpgplay, are able to parse logfiles basing
    over the template description. Backward logfile compatibility is broken.
  + Execcutable triggering mechanism (from SQL plugins) has been enhanced:
    some status informations (eg. stats of the last purging event) are now
    passed to the trigged executable in the form of environment variables.
    The list of supported variables has been summarized into TRIGGER_VARS
    document. The mechanism allows to spawn executables for post-processsing
    operations at arbitrary timeframes.
  + Support for 'temporary' devices (like PPP and maybe PCMCIA cards too)
    has been introduced. A new configuration directive 'interface_wait' (or
    '-w' commandline) instructs pmacctd to wait for the listening device to 
    become available. It works both when in startup phase and when already
    into main loop. A big thanks to Andre Berger for his support.
  ! ppp_handler() routine, which is in charge to handle PPP packets, have
    been totally rewritten. Thanks, again, to Andre Berger for his support.
  ! All link layer handling routines have been revised; some extra checks
    have been added to overcome issues caused from malicious handcrafted
    packets. 
  ! Some time handling and timeout issues have been revised into PostgreSQL
    plugin code. They were affecting only the triggering mechanism. 
  ! Fixed an execv() bug into MY_Exec() and PG_Exec(). It was causing the
    not correct execution of triggers. Now, a zeroed argv parameter is
    passed to the function. The problem has been verified on FreeBSD. 

0.7.7 -- 16-Nov-2004
  + Added two new aggregation primitives: 'src_as' and 'dst_as'. They allow
    accounting based over Autonomous System number; 'pmacctd' requires AS
    numbers to be supplied into a 'networks_file' configuration directive
    (which allows to specify the path to a networks definition file);
    'nfacctd' may either look up AS numbers from the networks definition file
    or read them from each NetFlow flow (this is default). 'nfacctd_as_new'
    key could be used to switch 'nfacctd' behaviour.
  + Added some new aggregation modes: 'sum_net', 'sum_as', 'sum_port' ('sum'
    which is actually an alias for 'sum_host' has been already introduced
    early). Sum is intended to be the total traffic (that is, inbound plus
    outbound traffic amounts) for each entry.
  + Added another aggregation primitive: 'none'. It does not make use of any
    primitive: it allows to see total bytes and packets transferred through
    an interface. 
  + The definition of a 'networks_file' enables network lookup: hosts inside
    defined networks are ok; hosts outside them are 'zeroed'. This behaviour
    may now also be applied to 'src_host', 'dst_host' and 'sum_host'. Under
    certain conditions (eg. when using only host/net/as primitives and defined 
    networks comprise all transiting hosts) it may be seen an alternative
    way to filter data. 
  ! 'frontend'/'backend' PostgreSQL plugin operations have been obsoleted.
    'unified'/'typed' operations have been introduced instead. See 'sql_data'
    description, CONFIG-KEYS document, for further informations.
  ! Optimizations have been applied to: core process, the newly introduced
    cache code (see 0.7.6) and in-memory table plugin. 
  ! Fixed some string handling routines: trim_all_spaces(), mark_columns()
  ! Solved a potential race condition which was affecting write_pid_file() 

0.7.6 -- 27-Oct-2004
  + Many changes has been introduced on 'pmacct' client side. '-m' switch
    (which output was suitable as MRTG input) has been obsoleted (though it
    will continue to work for next few releases). A new '-N' switch has
    been added: it returns counter value, suitable for integration with
    either RRDtool or MRTG. 
  + Support for batch queries have also been added into pmacct client. It
    allows to join up to 4096 requests into a single query. Requests could
    either be concatenated commandline or read from a file (more details are
    in FAQS and EXAMPLES). Batch queries allow to handle efficiently high number
    of requests in a single shot (for example to timely feed data to a large
    amount of graphs). 
  + Still pmacct client: '-r' switch, which already allows to reset counters
    for matched entries, now it also applies to group of matches (also referred
    as partial matches). 
  + New scripts have been added into the examples tree which show how to
    integrate memory and SQL plugins with RRDtool, MRTG and GNUplot. 
  + Memory plugin (IMT) has been further enhanced; each query from pmacct
    client is now evaluated and if involves just a short ride through the
    memory structure, it is served by the plugin itself without spawning a
    new child process. Batch queries support and reordering of fragmented
    queries have also been added.  
  + New cache has been introduced in both SQL plugins; its layout is still
    an hash structure but it now features also chains, allocation, reuse and
    retirement of chained nodes. It also sports a LRU list of nodes which eases
    node handling. The new solution avoids the creation of a collision queue,
    ensuring uniqueness of data placed onto the queries queue. While this
    already greatly benefits a directive like 'sql_dont_try_update', it also
    opens new chances for post-processing operations of queries queue. 

0.7.5 -- 14-Oct-2004
  + Introduced support for the definition of a 'known ports' list, when
    either 'src_port' or 'dst_port' primitives are in use. Known ports
    will get written into the backend; unknown ports will be simply zeroed.
    It could be enabled via 'ports_file' configuration key or '-o' commandline
    switch.
  + Introduced support for weekly and monthly counters breakdown; hourly, 
    minutely and daily were already supported. New breakdowns could be
    enabled via 'w' and 'M' words in 'sql_history' and related configuration
    keys.  
  + Added a '-i' commandline switch to both 'pmmyplay' and 'pmpgplay' to
    avoid UPDATE SQL queries and skip directly to INSERT ones. Many thanks 
    to Jamie Wilkinson. 
  ! 'pmmyplay' and 'pmpgplay' code has been optimized and updated; some 
    pieces of locking and transactional code were included into the inner
    loop. A big thanks goes to Wim Kerkhoff and Jamie Wilkinson.
  ! Networks aggregation code has been revised and optimized; a direct-mapped
    cache has been introduced to store (and search) last search results
    from the networks table. A binary search algorithm, though optimized,
    over the table has still been preferred over alternative approaches
    (hash, tries).

0.7.4 -- 30-Sep-2004
  + Enhanced packet tagging support; it's now broken in Pre-Tagging and
    Post-Tagging; Pre-Tagging allows 'nfacctd' to assign an ID to a flow
    evaluating an arbitrary combination of supported NetFlow packet
    fields (actually: IP address, Input Interface, Output Interface); the
    Pre-Tagging map is global; Pre-Tag is applied as soon as each flow
    is processed; Post-Tagging allows both 'nfacctd' and 'pmacctd' to
    assign an ID to packets using a supplied value; Post-Tagging could be
    either global or local to a single plugin (and more plugins may tag
    differently); Post-Tag is applied as a last action before the packet
    is sent to the plugin. 'nfacctd_id_map' and 'pmacctd_id' configuration
    keys are now obsolete; 'pre_tag_map' and 'post_tag' are introduced to
    replace them. 
  + Added support for Pre-Tag filtering; it allows to filter packets basing
    on their Pre-Tag value. The filter is evaluated after Pre-Tagging but
    before Post-Tagging; it adds to BPF filtering support ('aggregate_filter'
    configuration key); 'pre_tag_filter' configuration key is introduced.
  + Added support for Packet Sampling; the current implementation bases on
    a simple systematic algorithm; the new 'sampling_rate' configuration
    key expects a positive integer value >= 1 which is the ratio of the
    packets to be sampled (translates in: pick only 1 out of N packets).
    The key is either global or local (meaning that each plugin could apply
    different sampling rates).
  ! Fixed a bug which was causing crashes in both 'pmacctd' and 'nfacctd'
    when '-r' parameter was specified commandline. Thanks to Ali Nikham 
    for his support. 

0.7.3 -- 31-Aug-2004
  + Added support for both Netflow 'input interface' and 'output interface'
    fields. These two fields are contained in each flow record inside a
    NetFlow packet. It works through ID mapping (read below).
  + The ID map file syntax has been enhanced to allow greater flexibility
    in ID assignation to packets; example: 'id=1 ip=192.168.1.1 in=3
    out=5'; the above line will cause the 'ID' 1 to be assigned to
    flows exported by a NetFlow agent (for example a router) which IP
    address is '192.168.1.1' and transiting from interface '3' to interface
    '5'. 
  + In-memory table operations have been enhanced when using shared memory;
    a new reset flag has been added to avoid race conditions.
  ! Configuration lines are no more limited to some fixed maximum length
    but are allocated dynamically; this to overcome the need for long
    configuration lines to declare arbitrary filters and plugin's list.
    Thanks to Jerry Ji for his support.
  ! Configuration handlers, which are responsible to parse and validate
    values for each configuration key, have been rewritten on the way
    for a better portability. 
  ! Signal handler routines have been changed to better accomodate SysV
    semantics. 
  ! Fixed shared memory mmap() operations on IRIX and SunOS; a further
    test checks for either 'MAP_ANON' or 'MAP_ANONYMOUS' definitions; in
    case of negative outcome, mmap() will use '/dev/zero'. 
  ! Packet handlers have been revised and optimized.
  ! Some optimizations have been added when using shared memory; write()
    function has been usually called to signal the arrival of each new packet,
    through the core process/plugin control channel; now it does so if and
    only if the plugin, on the other side, is actually blocking over a poll();
    because of sequence numbers guarantee, data is directly written into
    shared memory segment.

0.7.2p1 -- 08-Aug-2004
  ! Multiple fixes in plugin's configuration post checks; negative outcome
    of some checks was leading to clear misbehaviours. Versions affected
    are >= 0.7.0 . A big thanks goes to Alexandra Walford for her support.

0.7.2 -- 02-Aug-2004
  + VLAN accounting has been added. The new 'vlan' keyword is supported as
    argument of both '-c' commandline switch and 'aggregate' configuration
    key.
  + Distributed accounting support has been added. It could be enabled into
    'pmacctd' via 'pmacctd_id' configuration key and into 'nfacctd' via the
    'nfacctd_id_file' configuration key. While 'pmacctd_id' key expects as
    value a small integer, 'nfacctd_id_file' expects a path to a file which
    contains the mapping: 'IP address of the router (exporting Newflow) ->
    small integer'. This scheme ease tasks such as keeping track of who has
    generated what data and either cluster or keep disjoint data coming from
    different sources when using a SQL database as backend. 
  + Introduced SQL table version 2. The SQL schema is the same as existing
    tables with the following additions: support for distributed accounting;
    support for VLAN accounting.
  + Added MAC addresses query capabilties to pmacct client. 
  + Added '-r' commandline switch to pmacct client. It can only be used in
    conjunction with '-m' or '-M' switches. It allows to reset packet and
    bytes counters of the retrieved record.
  ! Exit codes have been fixed in both 'pmacctd' and 'nfacctd'. Thanks to
    Jerry Ji for his signallation. 
  ! Fixed a problem when retrieving data from memory table: sometimes null
    data (without any error message) was returned to the client; the problem
    has been successfully reproduced only on FreeBSD 5.1: after an accept()
    call, the socket being returned inherits same flags of the listening
    socket, this case non-blocking flag. Thanks to Nicolas Deffayet for his
    support. 
  ! Revised PostgreSQL creation script. 

0.7.1 -- 14-Jul-2004
  + Added shared memory implementation; core process, now, could push data
    into a shared memory segment and then signal arrival of new data to the
    plugin. Shared memory support could be enabled via '--enable-mmap' switch
    at configuration time.
  + Strongly enhanced gathering capabilities of pmacct client; pmacct client
    is used to fetch data from memory plugin; it is, now, able to ask exact
    or partial matches via '-M' switch and return a readable listing output.
    MRTG export capabilities, full table fetch and table status query are
    still supported. 
  + Introduced SQL table versioning. It could be enabled via 'sql_table_version'
    configuration switch. It will enable to build new SQL tables (for example
    adding new aggregation methods) while allowing who is not interested in new
    setups to work with old tables. 
  + Added checks for packet capture type; informations acquired are later used
    for better handling pcap interface. 
  ! Fixed some issues concerning pmacctd VLAN and PPPOE code.
  ! Fixed a mmap() issue on Tru64 systems.
  ! Fixed some minor poll() misbehaviours in MySQL, PgSQL and print plugins;
    they were not correctly handled. 
  

0.7.0p1 -- 13-Jul-2004
  ! Fixes in cache code; affects MySQL, PgSQL and print plugins.

0.7.0 -- 01-Jul-2004
  + PMACCT OPENS TO NETFLOW: a new network daemon, nfacctd, is introduced:
    nfacctd listens for Netflow V1/V5 packets; is able to apply BPF filters
    and to aggregate packets; it's then able to either save data in a memory
    table, MySQL or PostgreSQL database or simply output packets on the screen.
    It can read timestamps from Netflow packets in msecs, seconds or ignore
    them generating new timestamps; a simple allow table mechanism allows
    to silently discard Netflow packets not generated by a list of trusted
    hosts.  
  + Strongly enhanced IP fragmentation handling in pmacctd.
  + Added new checks into the building systems; new hints when it searches 
    for libraries and headers; initial tests for C compilers capabilities
    have been added. 
  + Works to let pmacct run on IRIX platforms continue; some issues with
    MipsPRO compiler have been solved; added proper compilation flags/hints.
    SIGCHLD is now properly handled and child processes are correctly retired.
    (a thank for his support goes to Joerg Behrens) 
  + First, timidous, introduction of mmap() calls in memory plugin; they need
    to be enabled with '--enable-mmap' flag at configure time. 
  ! Fixed a potential deadlock issue in PostgreSQL plugin; changed locking
    mechanism. (a big thank to Wim Kerkhoff)
  ! Fixed an issue concerning networks aggregation on Tru64 systems.

0.6.4p1 -- 01-Jun-2004
  ! Fixed an issue with cache aliasing in MySQL and PostgreSQL plugins.
    Other plugins are not affected; this potential issue affects only
    version 0.6.4, not previous ones. Anyone using these plugins with 
    0.6.4 is strongly encouraged to upgrade to 0.6.4p1. 

0.6.4 -- 27-May-2004
  + Added chance to launch executables from both SQL plugins at arbitrary 
    time intervals to ease data post-processing tasks. Two new keys are
    available: 'sql_trigger_exec' and 'sql_trigger_time'. If any interval
    is supplied the specified executable is triggered every time data is
    purged from the cache. 
  + Added a new 'print' plugin. Enabling it, data is pulled at regular
    intervals to stdout in a way similar to cflowd's 'flow-print'.
    tool. New config keys are 'print_refresh_time', 'print_cache_entries'
    and 'print_markers'. This last key enables the print of start/end
    markers each time the cache is purged.  
  + Added 'sql_dont_try_update' switch to avoid UPDATE queries to the DB
    and skip directly to INSERT ones. Performance gains has been noticed
    when UPDATEs are not necessary (eg. when using timeslots to break up
    counters and sql_history = sql_refresh_time).
    Thanks to Jamie Wilkinson. 
  + Optimized use of transactions in PostgreSQL plugin; in the new scheme
    is built a single big transaction for each cache purge process. This
    leads to good performance gains; recovery mechanisms have been modified 
    to overcome whole transaction trashing. Many thanks to James Gregory
    and Jamie Wilkinson.
  ! Enhanced debug messages output when specific error conditions are returned
    by the DB. 
  ! Fixed a potential counters overflow issue in both MySQL and PgSQL
    plugins cache.
  ! Fixed preprocessor definitions issue: LOCK_UN, LOCK_EX are undeclared
    on IRIX and Solaris. Thanks to Wilhelm Greiner for the fix.

0.6.3 -- 27-Apr-2004
  + Added support for full libpcap-style filtering capabilities inside
    pmacctd. This allows to bind arbitrary filters to each plugin (in
    addition to already existing chance to apply them to the listening
    interface via 'pcap_filter' configuraiton key). The config key to
    specify these new filters is 'aggregate_filter'.  
  + Strongly improved networks definition file handling; now the file is
    parsed and organized as a hierarchical tree in memory. This allows to
    recognize and support networks-in-networks. 
  + Initial optimizations has been done over the code produced in last
    few months. 
  + Preprocessor definitions has been added to some part of the code, to
    allow pmacctd compile over IRIX. It has been reported to work over a
    IRIX64 6.5.23 box. Thanks to Wilhelm Greiner for his efforts.
  + Added flock() protected access to recovery logfiles.
  ! Fixed an ugly SEGV issue detected in both 0.6.2's logfile player tools.

0.6.2 -- 14-Apr-2004
  + Added support for networks aggregation. Two new primitives has
    been added 'src_net' and 'dst_net' to be used in conjunction with
    a network's definitions file (path is supplied via 'networks_file'
    configuration key). An example of this file is in the examples/
    directory. 
    When this aggregation is enabled, IP addresses are compared against
    the networks table; then the matching network will get written to
    the backend; if any match occurs a '0.0.0.0' is written.
    A really big thank goes to Martin Anderberg for his strong support
    during last weeks. 
  + pipe() has been thrown away; socketpair() has been introduced to
    set up a communication channel between pmacctd core process and
    plugins.
  + Added 'plugin_pipe_size' configuration key to adjust queue depth 
    (size) beween core process and plugins. A default value is set by
    operating system; it could not suffice when handling heavy traffic
    loads. Added also a specific error string when pipe gets filled.
  + Added 'plugin_buffer_size' configuration key to enable chances to
    bufferize data to be sent to plugins. When under great loads this
    helps in preventing high CPU usage and excessive pressure over
    kernel.
  + SQL plugins aliasing behaviour has been changed; when no free space
    for new data is found and old data has to be pulled out, it's now
    actually written to the DB but it's inserted in a new 'collision
    queue'. This new queue is purged together with the 'queries queue'.
    See INTERNALS for further details. 
  + SQL plugins cache behaviour has been changed by a direct-mapped
    one to a 3-ways associative to get better scores when searching
    free space for new data. See INTERNALS for further details.
  + Added 'sql_cache_entries' configuration key to adjust bucket's
    number of SQL plugin cache. As every hashed structure, a prime
    number of buckets is advisable to get better dispersion of data
    through the table.
  ! Fixed a malloc() SEGV issue in in-memory table plugin first
    noticed with gcc 3.3.3 (Debian 20040320) and glibc 2.3.2.
  ! Fixed a SEGV issue carried with last release. Improved handling
    of communication channels between core process and plugins. 
  ! Uniformed plugin's handling of signals; now sending a SIGINT to
    all pmacctd processes causes it to flush caches and exit nicely.
  ! Updated documentation; still no man page.

0.6.1 -- 24-Mar-2004
  + A new concept has been introduced: plugin names. A name could
    be assigned to each running plugin allowing to run more
    instances of the same plugin type; each one is configurable
    with global or 'named' keys. Take a look to examples for
    further info. 
  + Added support for PPPOE links. The code has been fully contributed
    by Vasiliy Ponomarev. A big thank goes to him.
  + Added a 'sql_startup_delay' configuration key to allow more
    plugin instances that need to write to the DB, to flush their
    data at same intervals but in different times to avoid locking
    stalls or DB overkills.
  + Improved handling of syslog connections. SIGHUP signal, used to
    reopen a connection with syslog (eg. for log rotation purposes),
    now is supported in all plugins. 
  + A simple LRU (Last Recently Used) cache has been added to the
    in-memory table plugin. The cache gives great benefits (exploiting
    some kind of locality in communication flows) when the table gets
    large (and chain in buckets become long and expensive to traverse).
  + Down-up of listening interface are now handled properly. Such an
    event traps a reopening of connection with libpcap. [EXPERIMENTAL]
  + Some work has been done (mostly via directives to preprocessor)
    in order to get pmacct compiled under Solaris. [HIGLY EXPERIMENTAL,
    translates: don't assume it works but, please, try it out and some
    kind of feedback would be appreciated] 
  ! Plugins have been better structured; plugin hooking has been
    simplified and re-documented; configuration parser has been
    strongly improved.
  ! Fixed a bug in 'configure' script; when supplying custom paths to
    MySQL libraries an erroneous library filename was searched for.
    (thanks to Wim Kerkhoff) 
  

0.6.0p3 -- 09-Feb-2004
  ! Fixed an issue concerning promiscuous mode; it was
    erroneously defaulting to 'false' under certain
    conditions. (Thanks to Royston Boot for signalling the
    problem)

0.6.0p2 -- 05-Feb-2004
  ! Fixed pmacct daemon in-memory table plugin unstability,
    noticed under sustained loads. (A thank for signalling
    the problem goes to Martin Pot) 
  ! Minor code rewritings for better optimizazion done in
    both in-memory table plugin and pmacct client.

0.6.0p1 -- 28-Jan-2004
  ! Fixed a bug in in-memory table plugin that was causing
    incorrect memorization of statistics. (Many thanks for
    promptly signalling it go to Martin Pot)
  ! Fixed a bug in pmacct client, used to gather stats from
    in-memory table. Under high loads and certain conditions
    the client was returning SEGV due to a realloc() issue.
    (Thanks to Martin Pot)

0.6.0  -- 27-Jan-2004
  + PMACCT OPENS TO POSTGRESQL: fully featured PostgreSQL
    plugin has been added; it's transaction based and
    already supports "recovery mode" both via logfile and
    backup DB actions. pmpgplay is the new tool that allows
    to play logfiles written in recovery mode by the plugin
    into a PostgreSQL DB. See CONFIG-KEYS and EXAMPLES for
    further informations. (Again, many thanks to Wim Kerkoff) 
  + Added new "recovery mode" action to MySQL plugin: write
    data to a backup DB if primary DB fails. DB table/user/
    password need to be the same as in the primary DB. The
    action could be enabled via "sql_backup_host" config
    key. 
  + Added a "sql_data" configuration optinion; a "frontend"
    value means to write human readable (strings) data; a
    "backend" value means to write integers in network byte
    order. Currently, this option is supported only into the
    new PostgreSQL plugin. See CONFIG-KEYS and README.pgsql
    for further informations.
  + Added support for simple password authentication in 
    client/server query mechanism for in-memory table
    statistics. It's available via "imt_passwd" config key. 
  + Added a "-t" commandline switch to pmmyplay; it runs
    the tool in a test only mode; useful to check header
    infos or logfile integrity.
  ! Fixed an ugly bug that made impossible MAC accounting 
    over certain links. Was affected only version 0.5.4. 
  ! Many code and structure cleanups.

0.5.4  -- 18-Dec-2003
  + Added a commandline and configuration switch to use 
    or not promiscuous mode for traffic capturing; useful 
    to avoid waste of resources if running over a router. 
  + Introduced a "recovery mode" concept for MySQL plugin:
    if DB fails an action is taken; currently is possible
    to write data to a logfile. More failover solutions to
    come in next releases. Thanks also to Wim Kerkhoff. 
  + Added a new "pmmyplay" tool. Allows to play logfiles
    previously written by a MySQL plugin in recovery mode.
    Check EXAMPLES for hints; see INTERNALS for further
    details about recovery mode and pmmyplay. 
  + Added syslog logging and debugging. Thanks for long
    brainstormings to Wim Kerkhoff.
  + Added chance to write PID of pmacctd core process to
    a specified file; it could help in automating tasks
    that need to send signals to pmacctd (eg. to rotate
    logfiles and reopen syslog connection). Take a look
    to SIGNALS file for further informations.
  + support for 802.11 Wireless links. [EXPERIMENTAL]  
  + support for linux cooked device links (DLT_LINUX_SLL).
    pcap library >= 0.6.x is needed. A big thank goes to
    KP Kirchdoerfer.
  ! Simplified client/server query mechanism; avoided all
    string comparison stuff. 
  ! Large parts of in-memory table plugin code has been
    revised to achieve better efficiency and optimization of
    available resources.

0.5.3  -- 20-Nov-2003
  ! pmacctd core has been optimized and a new loop-callback
    scheme driven by pcap library has been introduced; I/O
    multiplexing is avoided.
  ! In MySQL plugin, refresh of entries in the DB has been
    switched from a signal-driven approach to a lazy timeslot
    based one. If using historical recording, taking care
    to the choosen values, this greatly alleviates cache 
    aliasing.
  ! In MySQL plugin, modulo function (for insertion of data in
    the direct mapped cache) has been changed: crc32 algorithm
    has been adopted. Experimental tests shown the reduction of
    cache aliasing to about 0.45%. 
  ! The whole MySQL plugin has been inspected for performance
    bottlenecks resulted by the addition of new features in
    last releases.
  ! Fixed a bug in link layer handlers. 

0.5.2  -- 03-Nov-2003
  + "sql_history" configuration key syntax has been changed to
    support history recording at fixed times with mins, hrs and
    days granularity. A little of date arithmetics has been
    introduced (merely multiplicative factors, eg. to ease 95th
    percentile operations).
  + Added "sql_history_roundoff" configuration key to round off
    time of first timeslot. This little care gives cleaner time
    results and inductively affects all subsequent slots.
  + Achieved more precise calculations via timestamps added to
    the cache structure to avoid data counted during the current
    timeslot and not already fed in the DB to be accounted in next
    slot. 
  ! Monthly historical aggregation is no more available.
  ! Fixed portability issues posed by vsnprintf() in MySQL
    plugin. Now the plugin compiles smoothly under Tru64 Unix.

0.5.1  -- 01-Oct-2003
  + due to the proliferation of command-line options, the
    support for a configuration file has been added. All
    commandline switches until version 0.5.0 will be supported
    in the future.
    New configurable options (eg. log to a remote SQL server)
    will be only supported via configuration file. See 
    CONFIG-KEYS file for available configuration keys.
  + added support for historical recording of counters in the
    MySQL database. Available granularities of aggregation are
    hourly, daily or monthly (eg. counters are separated hour
    by hour, daily of monthly for each record). Timestamps of
    last INSERT and UPDATE have been added over each record.
    (thanks to Wim Kerkhoff for his strong collaboration)
  + support for IP header options.
  + support for PPP links. [EXPERIMENTAL]  
  ! Fixed a MySQL plugin direct-mapped cache issue: the cache
    now traps INSERT queries when an UPDATE fails due to any
    asyncronous table manipulation event (eg. external scripts,
    table truncation, etc.).
  ! MySQL plugin has been strongly revised and optimized; added
    options to save data to a remote sql server and to customize
    username, password and table; added MySQL locking stuff. 
    (another big thank to Wim Kerkhoff).
  ! various code cleanups.

0.5.0  -- 22-Jul-2003
  + static aggregation directives (src_host, dst_host, ..)
    are now superseded by primitives that can be stacked
    together to form complex aggregation methods. 
    The commandline syntax of the client program has been
    consequently changed to support these new features. 
  + two new primitives have been added: source MAC address
    and destination MAC address. 
  + support for 802.1Q (VLANs) tagged packets (thanks to
    Rich Gade). 
  + support for FDDI links. [EXPERIMENTAL]
  ! the core pmacctd loop (that gathers packets off the
    wire and feeds data to plugins) has been revised and
    strongly optimized. 
  ! the main loop of MySQL plugin has been optimized with
    the introduction of adaptive selection queries during 
    the update process.
  ! fixed a memory allocation issue (that caused a SIGSEGV,
    under certain circustances) in pmacct client: now the
    upper bound of dss is checked for large data retrieval.

0.4.2  -- 20-Jun-2003
  + limited support for transport protocols (currently
    only tcp and udp): aggregation of statistics for
    source or destination port. 
  + optimized query mechanism for in-memory table; solved
    few generalization issues that will enable (in future
    versions) to support complex queries. 
  + added "-t" pmacctd commandline switch to specify a
    custom database table. 
  ! fixed realloc() issue in pmacct client (thanks to
    Arjen Nienhuis).
  ! fixed an issue regarding mysql headers in the configure
    script. 

0.4.1  -- 08-May-2003
  ! missing break in a case statement that led pmacctd
    to misbehaviours; a cleaner approach to global vars
    (thanks to Peter Payne). 
  ! fixed an issue with getopt() and external vars. Now
    pmacct has reported to compile without problems on
    FreeBSD 4.x (thanks to Kirill Ponomarew).
  ! missing conditional statement to check the runtime
    execution of compiled plugins in exec_plugins()

0.4.0  -- 02-May-2003
  + switched to a plugin architecture: plugins need to
    be activated at configure time to be compiled and
    then used via "-P" command-line switch in pmacctd.
    See PLUGINS for more details.
  + added first plugin: Mysql driver. It uses a Mysql
    database as backend to store statistics other than
    in-memory table. See sql/ directory for scripts for
    creation of db needed to store data.
  + added the choice to collect statistics for traffic
    flows in addition to src|dst|sum aggregation via
    the "-c flows" command-line switch in pmacctd.
  + major code cleanups.
  + mostly rewritten configure script; switched back to
    autoconf 2.1.

0.3.4  -- 24-Mar-2003
  + accounting of IP traffic for source, destination
    and aggregation of both. Introduced -c switch to
    pmacctd (thanks to Martynas Bieliauskas).
  + added daemonization of pmacctd process via -D
    command line switch
  + added buffering via pcap_open_live() timeout handling
    on those architectures where it is supported.
  + It compiles and works fine over FreeBSD 5.x;
    solved some pcap library issues.  
  + added customization of pipe for client/server
    communication via -p command line switch both in
    pmacct and pmacctd
 
0.3.3  -- 19-Mar-2003
  + introduced synchronous I/O multiplexing
  + support for -m 0 pmacctd switch, in-memory table
    can grow undefinitely. 
  + revised memory pool descriptors table structure
  ! introduced realloc() in pmacct to support really
    large in-memory table transfers; solved additional
    alignment problems. 
  ! solved compatibility issues with libpcap 0.4 
  ! solved nasty problem with -i pmacctd switch
  ! solved various memory code bugs and open issues

0.3.2  -- 13-Mar-2003
  + support for pcap library filters 
  ! minor bugfixes

0.3.1  -- 12-Mar-2003
  + documentation stuff: updated TODO and added INTERNALS
  + revised query mechanism to server process, added a
    standard header to find command and optional values
    carried in query buffer.
  + added -s commandline switch to customize the size of
    each memory pool; see INTERNLS for more informations
  ! stability tests and fixes 
  ! configure script enhancements

0.3.0  -- 11-Mar-2003
  ! not public release
  + increased efficiency through allocation of memory pools 
    instead of sparse malloc() calls when inserting new
    elements in in-memory table.
  + added -m commandline switch to pmacctd to set the number
    of available memory pools; the size of each memory pool is
    the number of buckets, chosen with -b commandline option,
    see INTERNALS for more informations.
  + switched client program to getopt() to acquire commandline
    inputs.
  + new -m commandline  option in client program to acquire
    statistics of a specified IP address in a format useful for
    acquisition by MRTG program; see examples directory for a
    sample mrtg configuration.
  ! major bugfixes
  ! minor code cleanups

0.2.4  -- 07-Mar-2003
  + portability: Tru64 5.x 
  ! configure script fixes
  ! minor bugfixes

0.2.3  -- 05-Mar-2003
  + first public release
  ! portability fixes
  ! minor bugfixes


0.2.2  -- 04-Mar-2003
  + minor code cleanups
  + added autoconf, automake stuff


0.2.1  -- 03-Mar-2003
  + fork()ing when handling queries  
  + signal handling
  + command-line options using getopt() 
  + usage instructions
  ! major bugfixes


0.2.0  -- 01-Mar-2003
  + dynamic allocation of in-memory table
  + query (client/server) mechanism 
  + added a Makefile
  ! major bugfixes


0.1.0  -- late Feb, 2003
  + Initial release 
