mirror of
https://github.com/openbsd/src.git
synced 2024-12-22 16:42:56 -08:00
f96bb33f47
- fprintf(stdout, ...) -> printf() - fputs(x, stdout) -> printf(); for consistency. fputs is twice as fast on atom x5-Z8300@1.44GHz but Amdahl sees a pure printf tcpdump only 2% slower than a pure fputs (for constant strings) tcpdump to /dev/null across a 20MB/~170k packet pcap file. ok dlg@ for fputs and ok tedu@ krw@ deraadt@ a2k19 for the rest
637 lines
14 KiB
C
637 lines
14 KiB
C
/* $OpenBSD: print-ip.c,v 1.53 2020/01/24 22:46:36 procter Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "addrtoname.h"
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#include "interface.h"
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#include "extract.h" /* must come after interface.h */
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/* Compatibility */
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#ifndef IPPROTO_ND
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#define IPPROTO_ND 77
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#endif
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#ifndef IN_CLASSD
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#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
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#endif
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/* Definitions required for ECN
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for use if the OS running tcpdump does not have ECN */
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#ifndef IPTOS_ECT
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#define IPTOS_ECT 0x02 /* ECN Capable Transport in IP header*/
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#endif
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#ifndef IPTOS_CE
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#define IPTOS_CE 0x01 /* ECN Cong. Experienced in IP header*/
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#endif
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/* (following from ipmulti/mrouted/prune.h) */
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/*
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* The packet format for a traceroute request.
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*/
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struct tr_query {
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u_int tr_src; /* traceroute source */
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u_int tr_dst; /* traceroute destination */
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u_int tr_raddr; /* traceroute response address */
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#if BYTE_ORDER == BIG_ENDIAN
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struct {
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u_int ttl : 8; /* traceroute response ttl */
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u_int qid : 24; /* traceroute query id */
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} q;
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#else
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struct {
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u_int qid : 24; /* traceroute query id */
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u_int ttl : 8; /* traceroute response ttl */
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} q;
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#endif
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};
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#define tr_rttl q.ttl
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#define tr_qid q.qid
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/*
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* Traceroute response format. A traceroute response has a tr_query at the
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* beginning, followed by one tr_resp for each hop taken.
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*/
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struct tr_resp {
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u_int tr_qarr; /* query arrival time */
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u_int tr_inaddr; /* incoming interface address */
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u_int tr_outaddr; /* outgoing interface address */
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u_int tr_rmtaddr; /* parent address in source tree */
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u_int tr_vifin; /* input packet count on interface */
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u_int tr_vifout; /* output packet count on interface */
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u_int tr_pktcnt; /* total incoming packets for src-grp */
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u_char tr_rproto; /* routing proto deployed on router */
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u_char tr_fttl; /* ttl required to forward on outvif */
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u_char tr_smask; /* subnet mask for src addr */
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u_char tr_rflags; /* forwarding error codes */
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};
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/* defs within mtrace */
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#define TR_QUERY 1
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#define TR_RESP 2
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/* fields for tr_rflags (forwarding error codes) */
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#define TR_NO_ERR 0
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#define TR_WRONG_IF 1
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#define TR_PRUNED 2
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#define TR_OPRUNED 3
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#define TR_SCOPED 4
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#define TR_NO_RTE 5
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#define TR_NO_FWD 7
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#define TR_NO_SPACE 0x81
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#define TR_OLD_ROUTER 0x82
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/* fields for tr_rproto (routing protocol) */
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#define TR_PROTO_DVMRP 1
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#define TR_PROTO_MOSPF 2
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#define TR_PROTO_PIM 3
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#define TR_PROTO_CBT 4
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static void print_mtrace(const u_char *bp, u_int len)
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{
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struct tr_query *tr = (struct tr_query *)(bp + 8);
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printf("mtrace %d: %s to %s reply-to %s", tr->tr_qid,
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ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
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ipaddr_string(&tr->tr_raddr));
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if (IN_CLASSD(ntohl(tr->tr_raddr)))
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printf(" with-ttl %d", tr->tr_rttl);
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}
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static void print_mresp(const u_char *bp, u_int len)
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{
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struct tr_query *tr = (struct tr_query *)(bp + 8);
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printf("mresp %d: %s to %s reply-to %s", tr->tr_qid,
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ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
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ipaddr_string(&tr->tr_raddr));
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if (IN_CLASSD(ntohl(tr->tr_raddr)))
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printf(" with-ttl %d", tr->tr_rttl);
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}
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static void
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igmp_print(const u_char *bp, u_int len, const u_char *bp2)
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{
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const struct ip *ip;
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ip = (const struct ip *)bp2;
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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TCHECK2(bp[0], 8);
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switch (bp[0]) {
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case 0x11:
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printf("igmp query");
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if (*(int *)&bp[4])
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printf(" [gaddr %s]", ipaddr_string(&bp[4]));
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if (len != 8)
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printf(" [len %d]", len);
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break;
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case 0x12:
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printf("igmp report %s", ipaddr_string(&bp[4]));
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if (len != 8)
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printf(" [len %d]", len);
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break;
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case 0x16:
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printf("igmp nreport %s", ipaddr_string(&bp[4]));
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break;
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case 0x17:
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printf("igmp leave %s", ipaddr_string(&bp[4]));
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break;
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case 0x13:
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printf("igmp dvmrp");
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if (len < 8)
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printf(" [len %d]", len);
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else
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dvmrp_print(bp, len);
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break;
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case 0x14:
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printf("igmp pim");
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pim_print(bp, len);
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break;
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case 0x1e:
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print_mresp(bp, len);
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break;
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case 0x1f:
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print_mtrace(bp, len);
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break;
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default:
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printf("igmp-%d", bp[0] & 0xf);
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break;
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}
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if ((bp[0] >> 4) != 1)
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printf(" [v%d]", bp[0] >> 4);
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TCHECK2(bp[0], len);
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if (vflag) {
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/* Check the IGMP checksum */
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u_int32_t sum = 0;
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int count;
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const u_short *sp = (u_short *)bp;
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for (count = len / 2; --count >= 0; )
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sum += *sp++;
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if (len & 1)
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sum += ntohs(*(u_char *) sp << 8);
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while (sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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sum = 0xffff & ~sum;
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if (sum != 0)
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printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
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}
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return;
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trunc:
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printf("[|igmp]");
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}
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/*
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* print the recorded route in an IP RR, LSRR or SSRR option.
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*/
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static void
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ip_printroute(const char *type, const u_char *cp, u_int length)
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{
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u_int ptr = cp[2] - 1;
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u_int len;
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printf(" %s{", type);
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if ((length + 1) & 3)
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printf(" [bad length %d]", length);
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if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
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printf(" [bad ptr %d]", cp[2]);
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type = "";
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for (len = 3; len < length; len += 4) {
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if (ptr == len)
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type = "#";
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printf("%s%s", type, ipaddr_string(&cp[len]));
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type = " ";
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}
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printf("%s}", ptr == len? "#" : "");
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}
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/*
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* print IP options.
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*/
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static void
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ip_optprint(const u_char *cp, u_int length)
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{
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u_int len;
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int tt;
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for (; length > 0; cp += len, length -= len) {
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TCHECK(cp[1]);
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tt = *cp;
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len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
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if (len <= 0) {
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printf("[|ip op len %d]", len);
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return;
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}
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if (&cp[1] >= snapend || cp + len > snapend) {
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printf("[|ip]");
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return;
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}
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switch (tt) {
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case IPOPT_EOL:
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printf(" EOL");
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if (length > 1)
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printf("-%d", length - 1);
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return;
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case IPOPT_NOP:
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printf(" NOP");
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break;
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case IPOPT_TS:
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printf(" TS{%d}", len);
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break;
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case IPOPT_SECURITY:
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printf(" SECURITY{%d}", len);
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break;
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case IPOPT_RR:
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printf(" RR{%d}=", len);
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ip_printroute("RR", cp, len);
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break;
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case IPOPT_SSRR:
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ip_printroute("SSRR", cp, len);
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break;
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case IPOPT_LSRR:
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ip_printroute("LSRR", cp, len);
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break;
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default:
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printf(" IPOPT-%d{%d}", cp[0], len);
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break;
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}
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}
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return;
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trunc:
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printf("[|ip]");
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}
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/*
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* print an IP datagram.
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*/
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void
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ip_print(const u_char *bp, u_int length)
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{
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const struct ip *ip;
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u_int hlen, len, off;
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const u_char *cp;
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const u_char *pktp = packetp;
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const u_char *send = snapend;
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TCHECK2(bp[0], 1);
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ip = (const struct ip *)bp;
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/*
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* If the IP header is not aligned, copy into abuf.
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* This will never happen with BPF. It does happen with raw packet
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* dumps from -r.
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*/
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if ((intptr_t)ip & (sizeof(u_int32_t)-1)) {
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static u_char *abuf = NULL;
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static int didwarn = 0;
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int clen = snapend - bp;
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if (clen > snaplen)
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clen = snaplen;
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if (abuf == NULL) {
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abuf = malloc(snaplen);
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if (abuf == NULL)
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error("ip_print: malloc");
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}
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memmove((char *)abuf, (char *)ip, min(length, clen));
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snapend = abuf + clen;
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packetp = abuf;
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ip = (struct ip *)abuf;
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/* We really want libpcap to give us aligned packets */
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if (!didwarn) {
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warning("compensating for unaligned libpcap packets");
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++didwarn;
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}
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}
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TCHECK(*ip);
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if (ip->ip_v != IPVERSION) {
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printf("bad-ip-version %u", ip->ip_v);
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goto out;
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}
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len = ntohs(ip->ip_len);
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if (length < len) {
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printf("truncated-ip - %d bytes missing!",
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len - length);
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len = length;
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}
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hlen = ip->ip_hl * 4;
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if (hlen < sizeof(struct ip) || hlen > len) {
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printf("bad-hlen %d", hlen);
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goto out;
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}
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len -= hlen;
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/*
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* If this is fragment zero, hand it to the next higher
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* level protocol.
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*/
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off = ntohs(ip->ip_off);
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if ((off & 0x1fff) == 0) {
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cp = (const u_char *)ip + hlen;
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if (cp > snapend)
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goto trunc;
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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tcp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_UDP:
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udp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_ICMP:
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icmp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_IGRP
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#define IPPROTO_IGRP 9
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#endif
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case IPPROTO_IGRP:
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igrp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_ND:
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printf("%s > %s:", ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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printf(" nd %d", len);
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break;
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#ifndef IPPROTO_OSPF
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#define IPPROTO_OSPF 89
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#endif
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case IPPROTO_OSPF:
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ospf_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_IGMP
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#define IPPROTO_IGMP 2
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#endif
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case IPPROTO_IGMP:
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igmp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_IPIP
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#define IPPROTO_IPIP 4
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#endif
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case IPPROTO_IPIP:
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/* ip-in-ip encapsulation */
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if (vflag)
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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ip_print(cp, len);
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if (! vflag) {
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printf(" (encap)");
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goto out;
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}
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break;
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#ifndef IPPROTO_IPV6
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#define IPPROTO_IPV6 41
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#endif
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case IPPROTO_IPV6:
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/* ip6-in-ip encapsulation */
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if (vflag)
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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ip6_print(cp, len);
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if (! vflag) {
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printf(" (encap)");
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goto out;
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}
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break;
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47
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#endif
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case IPPROTO_GRE:
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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/* do it */
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gre_print(cp, len);
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break;
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#ifndef IPPROTO_ESP
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#define IPPROTO_ESP 50
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#endif
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case IPPROTO_ESP:
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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esp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_AH
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#define IPPROTO_AH 51
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#endif
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case IPPROTO_AH:
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ah_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_MOBILE
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#define IPPROTO_MOBILE 55
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#endif
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case IPPROTO_MOBILE:
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if (vflag)
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printf("mobile %s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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mobile_print(cp, len);
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if (! vflag) {
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printf(" (mobile encap)");
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goto out;
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}
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break;
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#ifndef IPPROTO_ETHERIP
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#define IPPROTO_ETHERIP 97
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#endif
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case IPPROTO_ETHERIP:
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printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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etherip_print(cp, snapend - cp, len);
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break;
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#ifndef IPPROTO_IPCOMP
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#define IPPROTO_IPCOMP 108
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#endif
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case IPPROTO_IPCOMP:
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ipcomp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_CARP
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#define IPPROTO_CARP 112
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#endif
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case IPPROTO_CARP:
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if (packettype == PT_VRRP) {
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if (vflag)
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printf("vrrp %s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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vrrp_print(cp, len, ip->ip_ttl);
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} else {
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if (vflag)
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printf("carp %s > %s: ",
|
|
ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
carp_print(cp, len, ip->ip_ttl);
|
|
}
|
|
break;
|
|
|
|
#ifndef IPPROTO_PFSYNC
|
|
#define IPPROTO_PFSYNC 240
|
|
#endif
|
|
case IPPROTO_PFSYNC:
|
|
pfsync_ip_print(cp,
|
|
(int)(snapend - (u_char *)ip) - hlen,
|
|
(const u_char *)ip);
|
|
break;
|
|
|
|
default:
|
|
printf("%s > %s:",
|
|
ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
printf(" ip-proto-%d %d", ip->ip_p, len);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* for fragmented datagrams, print id:size@offset. On all
|
|
* but the last stick a "+". For unfragmented datagrams, note
|
|
* the don't fragment flag.
|
|
*/
|
|
if (off & 0x3fff) {
|
|
/*
|
|
* if this isn't the first frag, we're missing the
|
|
* next level protocol header. print the ip addr.
|
|
*/
|
|
if (off & 0x1fff)
|
|
printf("%s > %s:",
|
|
ipaddr_string(&ip->ip_src),
|
|
ipaddr_string(&ip->ip_dst));
|
|
printf(" (frag %d:%d@%d%s)",
|
|
ntohs(ip->ip_id), len,
|
|
(off & 0x1fff) * 8,
|
|
(off & IP_MF)? "+" : "");
|
|
}
|
|
if (off & IP_DF)
|
|
printf(" (DF)");
|
|
|
|
if (ip->ip_tos) {
|
|
printf(" [tos 0x%x", (int)ip->ip_tos);
|
|
if (ip->ip_tos & (IPTOS_CE|IPTOS_ECT)) {
|
|
printf(" (");
|
|
if (ip->ip_tos & IPTOS_ECT) {
|
|
/* ECN-capable transport */
|
|
putchar('E');
|
|
}
|
|
if (ip->ip_tos & IPTOS_CE) {
|
|
/* _C_ongestion experienced (ECN) */
|
|
putchar('C');
|
|
}
|
|
printf(")");
|
|
}
|
|
printf("]");
|
|
}
|
|
|
|
if (ip->ip_ttl <= 1)
|
|
printf(" [ttl %d]", (int)ip->ip_ttl);
|
|
|
|
if (vflag) {
|
|
char *sep = "";
|
|
|
|
printf(" (");
|
|
if (ip->ip_ttl > 1) {
|
|
printf("%sttl %d", sep, (int)ip->ip_ttl);
|
|
sep = ", ";
|
|
}
|
|
if ((off & 0x3fff) == 0) {
|
|
printf("%sid %d", sep, (int)ntohs(ip->ip_id));
|
|
sep = ", ";
|
|
}
|
|
printf("%slen %u", sep, ntohs(ip->ip_len));
|
|
sep = ", ";
|
|
if ((u_char *)ip + hlen <= snapend) {
|
|
u_int16_t sum, ip_sum;
|
|
sum = in_cksum((const u_short *)ip, hlen, 0);
|
|
if (sum != 0) {
|
|
ip_sum = EXTRACT_16BITS(&ip->ip_sum);
|
|
printf("%sbad ip cksum %x! -> %x", sep, ip_sum,
|
|
in_cksum_shouldbe(ip_sum, sum));
|
|
sep = ", ";
|
|
}
|
|
}
|
|
if (hlen > sizeof(struct ip)) {
|
|
hlen -= sizeof(struct ip);
|
|
printf("%soptlen=%d", sep, hlen);
|
|
ip_optprint((u_char *)(ip + 1), hlen);
|
|
}
|
|
printf(")");
|
|
}
|
|
out:
|
|
packetp = pktp;
|
|
snapend = send;
|
|
return;
|
|
|
|
trunc:
|
|
printf("[|ip]");
|
|
}
|