commit | e2e3bd11bd7561bc9d6686283a668fa94e1206b7 | [log] [tgz] |
---|---|---|
author | Elliott Hughes <enh@google.com> | Mon May 15 10:59:29 2017 -0700 |
committer | Elliott Hughes <enh@google.com> | Mon May 15 14:40:28 2017 -0700 |
tree | c99c1f63716e7286ebfb83a0c78d91be06ec8488 | |
parent | 60aaf97844d4c21b8618fd50046e036c5f78ebe0 [diff] |
Upgrade to tcpdump 4.9.0. From CHANGES: Wednesday January 18, 2017 devel.fx.lebail@orange.fr Summary for 4.9.0 tcpdump release General updates: Improve separation frontend/backend (tcpdump/libnetdissect) Don't require IPv6 library support in order to support IPv6 addresses Introduce data types to use for integral values in packet structures Fix display of timestamps with -tt, -ttt and -ttttt options Fix some heap overflows found with American Fuzzy Lop by Hanno Boeck and others (More information in the log with CVE-2016-* and CVE-2017-*) Change the way protocols print link-layer addresses (Fix heap overflows in CALM-FAST and GeoNetworking printers) Pass correct caplen value to ether_print() and some other functions Fix lookup_nsap() to match what isonsap_string() expects Clean up relative time stamp printing (Fix an array overflow) Fix some alignment issues with GCC on Solaris 10 SPARC Add some ND_TTEST_/ND_TCHECK_ macros to simplify writing bounds checks Add a fn_printztn() which returns the number of bytes processed Add nd_init() and nd_cleanup() functions. Improve libsmi support Add CONTRIBUTING file Add a summary comment in all printers Compile with more warning options in devel mode if supported (-Wcast-qual, ...) Fix some leaks found by Valgrind/Memcheck Fix a bunch of de-constifications Squelch some Coverity warnings and some compiler warnings Update Coverity and Travis-CI setup Update Visual Studio files Frontend: Fix capsicum support to work with zerocopy buffers in bpf Try opening interfaces by name first, then by name-as-index Work around pcap_create() failures fetching time stamp type lists Fix a segmentation fault with 'tcpdump -J' Improve addrtostr6() bounds checking Add exit_tcpdump() function Don't drop CAP_SYS_CHROOT before chrooting Fixes issue where statistics not reported when -G and -W options used New printers supporting: Generic Protocol Extension for VXLAN (VXLAN-GPE) Home Networking Control Protocol (HNCP), RFCs 7787 and 7788 Locator/Identifier Separation Protocol (LISP), type 3 and type 4 packets Marvell Extended Distributed Switch Architecture header (MEDSA) Network Service Header (NSH) REdis Serialization Protocol (RESP) Updated printers: 802.11: Beginnings of 11ac radiotap support 802.11: Check the Protected bit for management frames 802.11: Do bounds checking on last_presentp before dereferencing it (Fix a heap overflow) 802.11: Fix the radiotap printer to handle the special bits correctly 802.11: If we have the MCS field, it's 11n 802.11: Only print unknown frame type or subtype messages once 802.11: Radiotap dBm values get printed as dB; Update a test output accordingly 802.11: Source and destination addresses were backwards AH: Add a bounds check AH: Report to our caller that dissection failed if a bounds check fails AP1394: Print src > dst, not dst > src ARP: Don't assume the target hardware address is <= 6 octets long (Fix a heap overflow) ATALK: Add bounds and length checks (Fix heap overflows) ATM: Add some bounds checks (Fix a heap overflow) ATM: Fix an incorrect bounds check BFD: Update specification from draft to RFC 5880 BFD: Update to print optional authentication field BGP: Add decoding of ADD-PATH capability BGP: Add support for the AIGP attribute (RFC7311) BGP: Print LARGE_COMMUNITY Path Attribute BGP: Update BGP numbers from IANA; Print minor values for FSM notification BOOTP: Add a bounds check Babel: Add decoder for source-specific extension CDP: Filter out non-printable characters CFM: Fixes to match the IEEE standard, additional bounds and length checks CSLIP: Add more bounds checks (Fix a heap overflow) ClassicalIPoATM: Add a bounds check on LLC+SNAP header (Fix a heap overflow) DHCP: Fix MUDURL and TZ options DHCPv6: Process MUDURL and TZ options DHCPv6: Update Status Codes with RFCs/IANA names DNS: Represent the "DNSSEC OK" bit as "DO" instead of "OK". Add a test case DTP: Improve packet integrity checks EGP: Fix bounds checks ESP: Don't use OpenSSL_add_all_algorithms() in OpenSSL 1.1.0 or later ESP: Handle OpenSSL 1.1.x Ethernet: Add some bounds checking before calling isoclns_print (Fix a heap overflow) Ethernet: Print the Length/Type field as length when needed FDDI: Fix -e output for FDDI FR: Add some packet-length checks and improve Q.933 printing (Fix heap overflows) GRE: Add some bounds checks (Fix heap overflows) Geneve: Fix error message with invalid option length; Update list option classes HNCP: Fix incorrect time interval format. Fix handling of IPv4 prefixes ICMP6: Fetch a 32-bit big-endian quantity with EXTRACT_32BITS() ICMP6: dagid is always an IPv6 address, not an opaque 128-bit string IGMP: Add a length check IP: Add a bounds check (Fix a heap overflow) IP: Check before fetching the protocol version (Fix a heap overflow) IP: Don't try to dissect if IP version != 4 (Fix a heap overflow) IP: Stop processing IPPROTO_ values once we hit IPPROTO_IPCOMP IPComp: Check whether we have the CPI before we fetch it (Fix a heap overflow) IPoFC: Fix -e output (IP-over-Fibre Channel) IPv6: Don't overwrite the destination IPv6 address for routing headers IPv6: Fix header printing IPv6: Stop processing IPPROTO_ values once we hit IPPROTO_IPCOMP ISAKMP: Clean up parsing of IKEv2 Security Associations ISOCLNS/IS-IS: Add support for Purge Originator Identifier (RFC6232) and test cases ISOCLNS/IS-IS: Don't overwrite packet data when checking the signature ISOCLNS/IS-IS: Filter out non-printable characters ISOCLNS/IS-IS: Fix segmentation faults ISOCLNS/IS-IS: Have signature_verify() do the copying and clearing ISOCLNS: Add some bounds checks Juniper: Make sure a Juniper header TLV isn't bigger than what's left in the packet (Fix a heap overflow) LLC/SNAP: With -e, print the LLC header before the SNAP header; without it, cut the SNAP header LLC: Add a bounds check (Fix a heap overflow) LLC: Clean up printing of LLC packets LLC: Fix the printing of RFC 948-style IP packets LLC: Skip the LLC and SNAP headers with -x for 802.11 and some other protocols LLDP: Implement IANA OUI and LLDP MUD option MPLS LSP ping: Update printing for RFC 4379, bug fixes, more bounds checks MPLS: "length" is now the *remaining* packet length MPLS: Add bounds and length checks (Fix a heap overflow) NFS: Add a test that makes unaligned accesses NFS: Don't assume the ONC RPC header is nicely aligned NFS: Don't overflow the Opaque_Handle buffer (Fix a segmentation fault) NFS: Don't run past the end of an NFSv3 file handle OLSR: Add a test to cover a HNA sgw case OLSR: Fix 'Advertised networks' count OLSR: Fix printing of smart-gateway HNAs in IPv4 OSPF: Add a bounds check for the Hello packet options OSPF: Do more bounds checking OSPF: Fix a segmentation fault OSPF: Fix printing 'ospf_topology_values' default OTV: Add missing bounds checks PGM: Print the formatted IP address, not the raw binary address, as a string PIM: Add some bounds checking (Fix a heap overflow) PIMv2: Fix checksumming of Register messages PPI: Pass an adjusted struct pcap_pkthdr to the sub-printer PPP: Add some bounds checks (Fix a heap overflow) PPP: Report invalid PAP AACK/ANAK packets Q.933: Add a missing bounds check RADIUS: Add Value 13 "VLAN" to Tunnel-Type attribute RADIUS: Filter out non-printable characters RADIUS: Translate UDP/1700 as RADIUS RESP: Do better checking of RESP packets RPKI-RTR: Add a return value check for "fn_printn" call RPKI-RTR: Remove printing when truncated condition already detected RPL: Fix 'Consistency Check' control code RPL: Fix suboption print RSVP: An INTEGRITY object in a submessage covers only the submessage RSVP: Fix an infinite loop; Add bounds and length checks RSVP: Fix some if statements missing brackets RSVP: Have signature_verify() do the copying and clearing RTCP: Add some bounds checks RTP: Add some bounds checks, fix two segmentation faults SCTP: Do more bounds checking SFLOW: Fix bounds checking SLOW: Fix bugs, add checks SMB: Before fetching the flags2 field, make sure we have it SMB: Do bounds checks on NBNS resource types and resource data lengths SNMP: Clean up the "have libsmi but no modules loaded" case SNMP: Clean up the object abbreviation list and fix the code to match them SNMP: Do bounds checks when printing character and octet strings SNMP: Improve ASN.1 bounds checks SNMP: More bounds and length checks STP: Add a bunch of bounds checks, and fix some printing (Fix heap overflows) STP: Filter out non-printable characters TCP: Add bounds and length checks for packets with TCP option 20 TCP: Correct TCP option Kind value for TCP Auth and add SCPS-TP TCP: Fix two bounds checks (Fix heap overflows) TCP: Make sure we have the data offset field before fetching it (Fix a heap overflow) TCP: Put TCP-AO option decoding right TFTP: Don't use strchr() to scan packet data (Fix a heap overflow) Telnet: Add some bounds checks TokenRing: Fix -e output UDLD: Fix an infinite loop UDP: Add a bounds check (Fix a heap overflow) UDP: Check against the packet length first UDP: Don't do the DDP-over-UDP heuristic check up front VAT: Add some bounds checks VTP: Add a test on Mgmt Domain Name length VTP: Add bounds checks and filter out non-printable characters VXLAN: Add a bound check and a test case ZeroMQ: Fix an infinite loop Tuesday April 14, 2015 guy@alum.mit.edu Summary for 4.8.0 tcpdump release Fix "-x" for Apple PKTAP and PPI packets Bug: N/A Test: "adb shell tcpdump" Change-Id: I81df72cf1ebdbe61c5b6069d8532ae817570f23f
TCPDUMP 4.x.y
Now maintained by “The Tcpdump Group”
See www.tcpdump.org
Please send inquiries/comments/reports to:
Anonymous Git is available via:
git clone git://bpf.tcpdump.org/tcpdump
Please submit patches by forking the branch on GitHub at:
and issuing a pull request.
formerly from Lawrence Berkeley National Laboratory
Network Research Group tcpdump@ee.lbl.gov
ftp://ftp.ee.lbl.gov/old/tcpdump.tar.Z (3.4)
This directory contains source code for tcpdump, a tool for network monitoring and data acquisition. This software was originally developed by the Network Research Group at the Lawrence Berkeley National Laboratory. The original distribution is available via anonymous ftp to ftp.ee.lbl.gov
, in tcpdump.tar.Z
. More recent development is performed at tcpdump.org, http://www.tcpdump.org/
Tcpdump uses libpcap, a system-independent interface for user-level packet capture. Before building tcpdump, you must first retrieve and build libpcap, also originally from LBL and now being maintained by tcpdump.org; see http://www.tcpdump.org/ .
Once libpcap is built (either install it or make sure it's in ../libpcap
), you can build tcpdump using the procedure in the INSTALL.txt
file.
The program is loosely based on SMI‘s “etherfind” although none of the etherfind code remains. It was originally written by Van Jacobson as part of an ongoing research project to investigate and improve tcp and internet gateway performance. The parts of the program originally taken from Sun’s etherfind were later re-written by Steven McCanne of LBL. To insure that there would be no vestige of proprietary code in tcpdump, Steve wrote these pieces from the specification given by the manual entry, with no access to the source of tcpdump or etherfind.
Over the past few years, tcpdump has been steadily improved by the excellent contributions from the Internet community (just browse through the CHANGES
file). We are grateful for all the input.
Richard Stevens gives an excellent treatment of the Internet protocols in his book “TCP/IP Illustrated, Volume 1”. If you want to learn more about tcpdump and how to interpret its output, pick up this book.
Some tools for viewing and analyzing tcpdump trace files are available from the Internet Traffic Archive:
Another tool that tcpdump users might find useful is tcpslice:
It is a program that can be used to extract portions of tcpdump binary trace files. See the above distribution for further details and documentation.
Problems, bugs, questions, desirable enhancements, etc. should be sent to the address “tcpdump-workers@lists.tcpdump.org”. Bugs, support requests, and feature requests may also be submitted on the GitHub issue tracker for tcpdump at:
Source code contributions, etc. should be sent to the email address above or submitted by forking the branch on GitHub at:
and issuing a pull request.
Current versions can be found at www.tcpdump.org.
original text by: Steve McCanne, Craig Leres, Van Jacobson
This directory also contains some short awk programs intended as examples of ways to reduce tcpdump data when you're tracking particular network problems: send-ack.awk Simplifies the tcpdump trace for an ftp (or other unidirectional tcp transfer). Since we assume that one host only sends and the other only acks, all address information is left off and we just note if the packet is a "send" or an "ack". There is one output line per line of the original trace. Field 1 is the packet time in decimal seconds, relative to the start of the conversation. Field 2 is delta-time from last packet. Field 3 is packet type/direction. "Send" means data going from sender to receiver, "ack" means an ack going from the receiver to the sender. A preceding "*" indicates that the data is a retransmission. A preceding "-" indicates a hole in the sequence space (i.e., missing packet(s)), a "#" means an odd-size (not max seg size) packet. Field 4 has the packet flags (same format as raw trace). Field 5 is the sequence number (start seq. num for sender, next expected seq number for acks). The number in parens following an ack is the delta-time from the first send of the packet to the ack. A number in parens following a send is the delta-time from the first send of the packet to the current send (on duplicate packets only). Duplicate sends or acks have a number in square brackets showing the number of duplicates so far. Here is a short sample from near the start of an ftp: 3.00 0.20 send . 512 3.20 0.20 ack . 1024 (0.20) 3.20 0.00 send P 1024 3.40 0.20 ack . 1536 (0.20) 3.80 0.40 * send . 0 (3.80) [2] 3.82 0.02 * ack . 1536 (0.62) [2] Three seconds into the conversation, bytes 512 through 1023 were sent. 200ms later they were acked. Shortly thereafter bytes 1024-1535 were sent and again acked after 200ms. Then, for no apparent reason, 0-511 is retransmitted, 3.8 seconds after its initial send (the round trip time for this ftp was 1sec, +-500ms). Since the receiver is expecting 1536, 1536 is re-acked when 0 arrives. packetdat.awk Computes chunk summary data for an ftp (or similar unidirectional tcp transfer). [A "chunk" refers to a chunk of the sequence space -- essentially the packet sequence number divided by the max segment size.] A summary line is printed showing the number of chunks, the number of packets it took to send that many chunks (if there are no lost or duplicated packets, the number of packets should equal the number of chunks) and the number of acks. Following the summary line is one line of information per chunk. The line contains eight fields: 1 - the chunk number 2 - the start sequence number for this chunk 3 - time of first send 4 - time of last send 5 - time of first ack 6 - time of last ack 7 - number of times chunk was sent 8 - number of times chunk was acked (all times are in decimal seconds, relative to the start of the conversation.) As an example, here is the first part of the output for an ftp trace: # 134 chunks. 536 packets sent. 508 acks. 1 1 0.00 5.80 0.20 0.20 4 1 2 513 0.28 6.20 0.40 0.40 4 1 3 1025 1.16 6.32 1.20 1.20 4 1 4 1561 1.86 15.00 2.00 2.00 6 1 5 2049 2.16 15.44 2.20 2.20 5 1 6 2585 2.64 16.44 2.80 2.80 5 1 7 3073 3.00 16.66 3.20 3.20 4 1 8 3609 3.20 17.24 3.40 5.82 4 11 9 4097 6.02 6.58 6.20 6.80 2 5 This says that 134 chunks were transferred (about 70K since the average packet size was 512 bytes). It took 536 packets to transfer the data (i.e., on the average each chunk was transmitted four times). Looking at, say, chunk 4, we see it represents the 512 bytes of sequence space from 1561 to 2048. It was first sent 1.86 seconds into the conversation. It was last sent 15 seconds into the conversation and was sent a total of 6 times (i.e., it was retransmitted every 2 seconds on the average). It was acked once, 140ms after it first arrived. stime.awk atime.awk Output one line per send or ack, respectively, in the form <time> <seq. number> where <time> is the time in seconds since the start of the transfer and <seq. number> is the sequence number being sent or acked. I typically plot this data looking for suspicious patterns. The problem I was looking at was the bulk-data-transfer throughput of medium delay network paths (1-6 sec. round trip time) under typical DARPA Internet conditions. The trace of the ftp transfer of a large file was used as the raw data source. The method was: - On a local host (but not the Sun running tcpdump), connect to the remote ftp. - On the monitor Sun, start the trace going. E.g., tcpdump host local-host and remote-host and port ftp-data >tracefile - On local, do either a get or put of a large file (~500KB), preferably to the null device (to minimize effects like closing the receive window while waiting for a disk write). - When transfer is finished, stop tcpdump. Use awk to make up two files of summary data (maxsize is the maximum packet size, tracedata is the file of tcpdump tracedata): awk -f send-ack.awk packetsize=avgsize tracedata >sa awk -f packetdat.awk packetsize=avgsize tracedata >pd - While the summary data files are printing, take a look at how the transfer behaved: awk -f stime.awk tracedata | xgraph (90% of what you learn seems to happen in this step). - Do all of the above steps several times, both directions, at different times of day, with different protocol implementations on the other end. - Using one of the Unix data analysis packages (in my case, S and Gary Perlman's Unix|Stat), spend a few months staring at the data. - Change something in the local protocol implementation and redo the steps above. - Once a week, tell your funding agent that you're discovering wonderful things and you'll write up that research report "real soon now".