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Make tcpdump a lot smarter about printing IGMP messages. Derived by groveling

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about in the mrouted sources and looking at packet traces.
This commit is contained in:
Garrett Wollman 1995-06-13 17:39:23 +00:00
parent d3628763db
commit 3589d0dfc6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9205
1 changed files with 103 additions and 6 deletions
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109
usr.sbin/tcpdump/tcpdump/print-ip.c
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@ -20,8 +20,9 @@
*/
#ifndef lint
/* From: Header: print-ip.c,v 1.28 92/05/25 14:29:02 mccanne Exp $ (LBL) */
static char rcsid[] =
"@(#) $Header: print-ip.c,v 1.38 94/06/14 20:17:40 leres Exp $ (LBL)";
"$Id: /a/ncvs/src/usr.sbin/tcpdump/tcpdump/print-ip.c,v 1.4 1995/03/08 12:52:33 olah Exp $";
#endif
#include <sys/param.h>
@ -66,30 +67,126 @@ igmp_print(register const u_char *bp, register int len,
}
switch (bp[0] & 0xf) {
case 1:
(void)printf("igmp query");
(void)printf("igmp %squery", bp[1] ? "new " : "");
if (bp[1] != 100)
printf(" [intvl %d]", bp[1]);
if (*(int *)&bp[4])
(void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
break;
case 2:
(void)printf("igmp report %s", ipaddr_string(&bp[4]));
case 6:
(void)printf("igmp %sreport %s",
(bp[0] & 0xf) == 6 ? "new " : "",
ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
case 7:
(void)printf("igmp leave %s", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
case 3:
(void)printf("igmp dvmrp %s", ipaddr_string(&bp[4]));
(void)printf("igmp dvmrp");
switch(bp[1]) {
case 1:
printf(" probe");
if (len < 8)
(void)printf(" [len %d]", len);
if (len > 12) {
int i;
for (i = 12; i + 3 < len; i += 4) {
printf("\n\t%s",
ipaddr_string(&bp[i]));
}
}
break;
case 2:
printf(" report");
if (len < 8)
(void)printf(" [len %d]", len);
break;
case 3:
case 5:
printf(" %sneighbor query", bp[1] == 5 ? "new " : "");
if (len < 8)
(void)printf(" [len %d]", len);
break;
case 4:
case 6:
printf(" %sneighbor list", bp[1] == 6 ? "new " : "");
if (len < 8)
(void)printf(" [len %d]", len);
break;
case 7:
printf(" prune %s from ", ipaddr_string(&bp[12]));
printf(" %s timer %d", ipaddr_string(&bp[8]),
ntohl(*(int *)&bp[16]));
if (len != 20)
(void)printf(" [len %d]", len);
break;
case 8:
printf(" graft %s from ", ipaddr_string(&bp[12]));
printf(" %s", ipaddr_string(&bp[8]));
if (len != 16)
(void)printf(" [len %d]", len);
break;
case 9:
printf(" graft ack %s from ",
ipaddr_string(&bp[12]));
printf(" %s", ipaddr_string(&bp[8]));
if (len != 16)
(void)printf(" [len %d]", len);
break;
default:
printf("-%d", bp[1]);
if (len < 8)
(void)printf(" [len %d]", len);
break;
}
if (bp[7] != 3
|| (bp[7] == 3 && (bp[6] > 5 || bp[6] < 4))) {
printf(" [v%d.%d]", bp[7], bp[6]);
}
break;
case 4:
printf("igmp pim %s", ipaddr_string(&bp[4]));
if (len < 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
case 15:
(void)printf("igmp mtrace %s", ipaddr_string(&bp[4]));
if (len < 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
case 14:
(void)printf("igmp mtrace-resp %s", ipaddr_string(&bp[4]));
if (len < 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
default:
(void)printf("igmp-%d", bp[0] & 0xf);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
}
if ((bp[0] >> 4) != 1)
(void)printf(" [v%d]", bp[0] >> 4);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
}
/*