e89167f07a
Changes: Thu. April 1, 2010. guy@alum.mit.edu. Summary for 1.1.1 libpcap release Update CHANGES to reflect more of the changes in 1.1.0. Fix build on RHEL5. Fix shared library build on AIX. Thu. March 11, 2010. ken@netfunctional.ca/guy@alum.mit.edu. Summary for 1.1.0 libpcap release Add SocketCAN capture support Add Myricom SNF API support Update Endace DAG and ERF support Add support for shared libraries on Solaris, HP-UX, and AIX Build, install, and un-install shared libraries by default; don't build/install shared libraries on platforms we don't support Fix building from a directory other than the source directory Fix compiler warnings and builds on some platforms Update config.guess and config.sub Support monitor mode on mac80211 devices on Linux Fix USB memory-mapped capturing on Linux; it requires a new DLT_ value On Linux, scan /sys/class/net for devices if we have it; scan it, or /proc/net/dev if we don't have /sys/class/net, even if we have getifaddrs(), as it'll find interfaces with no addresses Add limited support for reading pcap-ng files Fix BPF driver-loading error handling on AIX Support getting the full-length interface description on FreeBSD In the lexical analyzer, free up any addrinfo structure we got back from getaddrinfo(). Add support for BPF and libdlpi in OpenSolaris (and SXCE) Hyphenate "link-layer" everywhere Add /sys/kernel/debug/usb/usbmon to the list of usbmon locations In pcap_read_linux_mmap(), if there are no frames available, call poll() even if we're in non-blocking mode, so we pick up errors, and check for the errors in question. Note that poll() works on BPF devices is Snow Leopard If an ENXIO or ENETDOWN is received, it may mean the device has gone away. Deal with it. For BPF, raise the default capture buffer size to from 32k to 512k Support ps_ifdrop on Linux Added a bunch of #ifdef directives to make wpcap.dll (WinPcap) compile under cygwin. Changes to Linux mmapped captures. Fix bug where create_ring would fail for particular snaplen and buffer size combinations Update pcap-config so that it handles libpcap requiring additional libraries Add workaround for threadsafeness on Windows Add missing mapping for DLT_ENC <-> LINKTYPE_ENC DLT: Add DLT_CAN_SOCKETCAN DLT: Add Solaris ipnet Don't check for DLT_IPNET if it's not defined Add link-layer types for Fibre Channel FC-2 Add link-layer types for Wireless HART Add link-layer types for AOS Add link-layer types for DECT Autoconf fixes (AIX, HP-UX, OSF/1, Tru64 cleanups) Install headers unconditionally, and include vlan.h/bluetooth.h if enabled Autoconf fixes+cleanup Support enabling/disabling bluetooth (--{en,dis}able-bluetooth) Support disabling SITA support (--without-sita) Return -1 on failure to create packet ring (if supported but creation failed) Fix handling of 'any' device, so that it can be opened, and no longer attempt to open it in Monitor mode Add support for snapshot length for USB Memory-Mapped Interface Fix configure and build on recent Linux kernels Fix memory-mapped Linux capture to support pcap_next() and pcap_next_ex() Fixes for Linux USB capture DLT: Add DLT_LINUX_EVDEV DLT: Add DLT_GSMTAP_UM DLT: Add DLT_GSMTAP_ABIS
115 lines
4.8 KiB
Plaintext
115 lines
4.8 KiB
Plaintext
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The following instructions apply if you have a Linux or FreeBSD platform and
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want libpcap to support the DAG range of passive network monitoring cards from
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Endace (http://www.endace.com, see below for further contact details).
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1) Install and build the DAG software distribution by following the
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instructions supplied with that package. Current Endace customers can download
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the DAG software distibution from https://www.endace.com
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2) Configure libcap. To allow the 'configure' script to locate the DAG
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software distribution use the '--with-dag' option:
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./configure --with-dag=DIR
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Where DIR is the root of the DAG software distribution, for example
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/var/src/dag. If the DAG software is correctly detected 'configure' will
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report:
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checking whether we have DAG API... yes
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If 'configure' reports that there is no DAG API, the directory may have been
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incorrectly specified or the DAG software was not built before configuring
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libpcap.
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See also the libpcap INSTALL.txt file for further libpcap configuration
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options.
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Building libpcap at this stage will include support for both the native packet
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capture stream (linux or bpf) and for capturing from DAG cards. To build
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libpcap with only DAG support specify the capture type as 'dag' when
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configuring libpcap:
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./configure --with-dag=DIR --with-pcap=dag
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Applications built with libpcap configured in this way will only detect DAG
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cards and will not capture from the native OS packet stream.
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----------------------------------------------------------------------
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Libpcap when built for DAG cards against dag-2.5.1 or later releases:
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Timeouts are supported. pcap_dispatch() will return after to_ms milliseconds
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regardless of how many packets are received. If to_ms is zero pcap_dispatch()
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will block waiting for data indefinitely.
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pcap_dispatch() will block on and process a minimum of 64kB of data (before
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filtering) for efficiency. This can introduce high latencies on quiet
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interfaces unless a timeout value is set. The timeout expiring will override
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the 64kB minimum causing pcap_dispatch() to process any available data and
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return.
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pcap_setnonblock is supported. When nonblock is set, pcap_dispatch() will
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check once for available data, process any data available up to count, then
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return immediately.
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pcap_findalldevs() is supported, e.g. dag0, dag1...
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Some DAG cards can provide more than one 'stream' of received data.
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This can be data from different physical ports, or separated by filtering
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or load balancing mechanisms. Receive streams have even numbers, e.g.
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dag0:0, dag0:2 etc. Specifying transmit streams for capture is not supported.
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pcap_setfilter() is supported, BPF programs run in userspace.
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pcap_setdirection() is not supported. Only received traffic is captured.
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DAG cards normally do not have IP or link layer addresses assigned as
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they are used to passively monitor links.
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pcap_breakloop() is supported.
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pcap_datalink() and pcap_list_datalinks() are supported. The DAG card does
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not attempt to set the correct datalink type automatically where more than
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one type is possible.
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pcap_stats() is supported. ps_drop is the number of packets dropped due to
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RX stream buffer overflow, this count is before filters are applied (it will
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include packets that would have been dropped by the filter). The RX stream
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buffer size is user configurable outside libpcap, typically 16-512MB.
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pcap_get_selectable_fd() is not supported, as DAG cards do not support
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poll/select methods.
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pcap_inject() and pcap_sendpacket() are not supported.
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Some DAG cards now support capturing to multiple virtual interfaces, called
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streams. Capture streams have even numbers. These are available via libpcap
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as separate interfaces, e.g. dag0:0, dag0:2, dag0:4 etc. dag0:0 is the same
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as dag0. These are visible via pcap_findalldevs().
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libpcap now does NOT set the card's hardware snaplen (slen). This must now be
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set using the appropriate DAG coniguration program, e.g. dagthree, dagfour,
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dagsix, dagconfig. This is because the snaplen is currently shared between
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all of the streams. In future this may change if per-stream slen is
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implemented.
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DAG cards by default capture entire packets including the L2
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CRC/FCS. If the card is not configured to discard the CRC/FCS, this
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can confuse applications that use libpcap if they're not prepared for
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packets to have an FCS. Libpcap now reads the environment variable
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ERF_FCS_BITS to determine how many bits of CRC/FCS to strip from the
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end of the captured frame. This defaults to 32 for use with
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Ethernet. If the card is configured to strip the CRC/FCS, then set
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ERF_FCS_BITS=0. If used with a HDLC/PoS/PPP/Frame Relay link with 16
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bit CRC/FCS, then set ERF_FCS_BITS=16.
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----------------------------------------------------------------------
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Please submit bug reports via <support@endace.com>.
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Please also visit our Web site at:
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http://www.endace.com/
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For more information about Endace DAG cards contact <sales@endace.com>.
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