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Print out more useful information about IGMP packets. (Someday, this should

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include a full DVMRP parser.)
This commit is contained in:
Garrett Wollman 1994-09-08 02:29:12 +00:00
parent a7ab72edf1
commit 7c680644c9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2559
2 changed files with 98 additions and 18 deletions
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2
usr.sbin/tcpdump/tcpdump/Makefile
View File

@ -1,7 +1,7 @@
# @(#)Makefile 0.1 (RWGrimes) 3/24/93
PROG= tcpdump
CFLAGS+=-DCSLIP -DPPP -I.
CFLAGS+=-DCSLIP -DPPP -I. -I${.CURDIR}/../../mrouted
MAN1= tcpdump.1
SRCS= version.c addrtoname.c bpf_dump.c bpf_filter.c bpf_image.c etherent.c \
gencode.c inet.c md.c nametoaddr.c optimize.c os.c pcap.c \

114
usr.sbin/tcpdump/tcpdump/print-ip.c
View File

@ -21,7 +21,7 @@
#ifndef lint
static char rcsid[] =
"@(#) $Header: print-ip.c,v 1.28 92/05/25 14:29:02 mccanne Exp $ (LBL)";
"@(#) $Header: /home/ncvs/src/usr.sbin/tcpdump/tcpdump/print-ip.c,v 1.1.1.1 1993/06/12 14:42:08 rgrimes Exp $ (LBL)";
#endif
#include <sys/param.h>
@ -35,9 +35,11 @@ static char rcsid[] =
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <netinet/igmp.h>
#include "interface.h"
#include "addrtoname.h"
#include "dvmrp.h" /* in mrouted directory */
void
igmp_print(cp, len, ip)
@ -46,6 +48,7 @@ igmp_print(cp, len, ip)
register struct ip *ip;
{
register u_char *ep = (u_char *)snapend;
struct igmp *igmp = (struct igmp *)cp;
(void)printf("%s > %s: ",
ipaddr_string(&ip->ip_src),
@ -55,32 +58,100 @@ igmp_print(cp, len, ip)
(void)printf("[|igmp]");
return;
}
switch (cp[0] & 0xf) {
case 1:
switch (igmp->igmp_type) {
case IGMP_HOST_MEMBERSHIP_QUERY:
(void)printf("igmp query");
if (*(int *)&cp[4])
(void)printf(" [gaddr %s]", ipaddr_string(&cp[4]));
if (len != 8)
if (igmp->igmp_group.s_addr)
(void)printf(" [gaddr %s]",
ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case 2:
(void)printf("igmp report %s", ipaddr_string(&cp[4]));
if (len != 8)
case IGMP_HOST_MEMBERSHIP_REPORT:
(void)printf("igmp report %s", ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case 3:
(void)printf("igmp dvmrp", ipaddr_string(&cp[4]));
if (len < 8)
case IGMP_HOST_NEW_MEMBERSHIP_REPORT:
printf("igmp new report %s", ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case IGMP_HOST_LEAVE_MESSAGE:
printf("igmp leave %s", ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case IGMP_DVMRP:
(void)printf("igmp dvmrp");
switch(igmp->igmp_code) {
case DVMRP_PROBE:
printf(" probe");
break;
case DVMRP_REPORT:
printf(" report");
break;
case DVMRP_ASK_NEIGHBORS:
printf(" neighbor list request");
break;
case DVMRP_NEIGHBORS:
printf(" neighbor list reply");
break;
case DVMRP_ASK_NEIGHBORS2:
printf(" neighbor list request v2");
break;
case DVMRP_NEIGHBORS2:
printf(" neighbor list reply v2");
break;
case DVMRP_PRUNE:
printf(" prune");
break;
case DVMRP_GRAFT:
printf(" graft");
break;
case DVMRP_GRAFT_ACK:
printf(" graft ack");
break;
default:
printf("-%d", igmp->igmp_code);
break;
}
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case IGMP_MTRACE:
(void)printf("igmp traceroute %s",
ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
case IGMP_MTRACE_RESP:
(void)printf("igmp traceroute resp %s",
ipaddr_string(&igmp->igmp_group));
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
if (len != IGMP_MINLEN)
(void)printf(" [len %d]", len);
break;
default:
(void)printf("igmp-%d", cp[0] & 0xf);
(void)printf("igmp-%x", igmp->igmp_type);
if (igmp->igmp_code)
printf(" [code %d]", igmp->igmp_code);
break;
}
if ((cp[0] >> 4) != 1)
(void)printf(" [v%d]", cp[0] >> 4);
if (cp[1])
(void)printf(" [b1=0x%x]", cp[1]);
}
/*
@ -214,6 +285,15 @@ ip_print(ip, length)
return;
}
hlen = ip->ip_hl * 4;
if (hlen < sizeof (struct ip)) {
printf("invalid ip header length %d", hlen);
return;
}
if (ip->ip_v != 4) {
printf("unknown ip version %d", ip->ip_v);
return;
}
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);