From 1a9fbac03c684f29cff9ac44875bd9504a89f54e Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Fri, 15 Mar 2013 10:41:48 +0100 Subject: all: import netsniff-ng 0.5.8-rc0 source We decided to get rid of the old Git history and start a new one for several reasons: *) Allow / enforce only high-quality commits (which was not the case for many commits in the history), have a policy that is more close to the one from the Linux kernel. With high quality commits, we mean code that is logically split into commits and commit messages that are signed-off and have a proper subject and message body. We do not allow automatic Github merges anymore, since they are total bullshit. However, we will either cherry-pick your patches or pull them manually. *) The old archive was about ~27MB for no particular good reason. This basically derived from the bad decision that also some PDF files where stored there. From this moment onwards, no binary objects are allowed to be stored in this repository anymore. The old archive is not wiped away from the Internet. You will still be able to find it, e.g. on git.cryptoism.org etc. Signed-off-by: Daniel Borkmann Signed-off-by: Tobias Klauser --- proto_tcp.c | 155 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 proto_tcp.c (limited to 'proto_tcp.c') diff --git a/proto_tcp.c b/proto_tcp.c new file mode 100644 index 0000000..67e99b5 --- /dev/null +++ b/proto_tcp.c @@ -0,0 +1,155 @@ +/* + * netsniff-ng - the packet sniffing beast + * Copyright 2009, 2010 Daniel Borkmann. + * Subject to the GPL, version 2. + */ + +#include +#include +#include +#include /* for ntohs() */ +#include + +#include "proto.h" +#include "protos.h" +#include "dissector_eth.h" +#include "built_in.h" +#include "pkt_buff.h" + +struct tcphdr { + uint16_t source; + uint16_t dest; + uint32_t seq; + uint32_t ack_seq; +#if defined(__LITTLE_ENDIAN_BITFIELD) + __extension__ uint16_t res1:4, + doff:4, + fin:1, + syn:1, + rst:1, + psh:1, + ack:1, + urg:1, + ece:1, + cwr:1; +#elif defined(__BIG_ENDIAN_BITFIELD) + __extension__ uint16_t doff:4, + res1:4, + cwr:1, + ece:1, + urg:1, + ack:1, + psh:1, + rst:1, + syn:1, + fin:1; +#else +# error "Adjust your defines" +#endif + uint16_t window; + uint16_t check; + uint16_t urg_ptr; +} __packed; + +static void tcp(struct pkt_buff *pkt) +{ + struct tcphdr *tcp = (struct tcphdr *) pkt_pull(pkt, sizeof(*tcp)); + uint16_t src, dest; + char *src_name, *dest_name; + + if (tcp == NULL) + return; + + src = ntohs(tcp->source); + dest = ntohs(tcp->dest); + + src_name = lookup_port_tcp(src); + dest_name = lookup_port_tcp(dest); + + tprintf(" [ TCP "); + tprintf("Port (%u", src); + if (src_name) + tprintf(" (%s%s%s)", colorize_start(bold), src_name, + colorize_end()); + tprintf(" => %u", dest); + if (dest_name) + tprintf(" (%s%s%s)", colorize_start(bold), dest_name, + colorize_end()); + tprintf("), "); + tprintf("SN (0x%x), ", ntohl(tcp->seq)); + tprintf("AN (0x%x), ", ntohl(tcp->ack_seq)); + tprintf("DataOff (%u), ", tcp->doff); + tprintf("Res (%u), ", tcp->res1); + tprintf("Flags ("); + if (tcp->fin) + tprintf("FIN "); + if (tcp->syn) + tprintf("SYN "); + if (tcp->rst) + tprintf("RST "); + if (tcp->psh) + tprintf("PSH "); + if (tcp->ack) + tprintf("ACK "); + if (tcp->urg) + tprintf("URG "); + if (tcp->ece) + tprintf("ECE "); + if (tcp->cwr) + tprintf("CWR "); + tprintf("), "); + tprintf("Window (%u), ", ntohs(tcp->window)); + tprintf("CSum (0x%.4x), ", ntohs(tcp->check)); + tprintf("UrgPtr (%u)", ntohs(tcp->urg_ptr)); + tprintf(" ]\n"); +} + +static void tcp_less(struct pkt_buff *pkt) +{ + struct tcphdr *tcp = (struct tcphdr *) pkt_pull(pkt, sizeof(*tcp)); + uint16_t src, dest; + char *src_name, *dest_name; + + if (tcp == NULL) + return; + + src = ntohs(tcp->source); + dest = ntohs(tcp->dest); + + src_name = lookup_port_tcp(src); + dest_name = lookup_port_tcp(dest); + + tprintf(" TCP %u", src); + if(src_name) + tprintf("(%s%s%s)", colorize_start(bold), src_name, + colorize_end()); + tprintf("/%u", dest); + if(dest_name) + tprintf("(%s%s%s)", colorize_start(bold), dest_name, + colorize_end()); + tprintf(" F%s",colorize_start(bold)); + if (tcp->fin) + tprintf(" FIN"); + if (tcp->syn) + tprintf(" SYN"); + if (tcp->rst) + tprintf(" RST"); + if (tcp->psh) + tprintf(" PSH"); + if (tcp->ack) + tprintf(" ACK"); + if (tcp->urg) + tprintf(" URG"); + if (tcp->ece) + tprintf(" ECE"); + if (tcp->cwr) + tprintf(" CWR"); + tprintf("%s Win %u S/A 0x%x/0x%x", colorize_end(), + ntohs(tcp->window), ntohl(tcp->seq), ntohl(tcp->ack_seq)); +} + +struct protocol tcp_ops = { + .key = 0x06, + .print_full = tcp, + .print_less = tcp_less, +}; -- cgit v1.2.3-54-g00ecf