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add support for further dissection of the IPCP Compression Option

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This commit is contained in:
hannes 2005-12-05 11:35:58 +00:00
parent b2bf371ad5
commit 78299f4f5b
1 changed files with 71 additions and 5 deletions
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76
print-ppp.c
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@ -31,7 +31,7 @@
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.113 2005-11-03 07:30:25 hannes Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -296,6 +296,20 @@ struct tok ipcpopt_values[] = {
{ 0, NULL }
};
#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
#define IPCPOPT_IPCOMP_MINLEN 14
struct tok ipcpopt_compproto_values[] = {
{ PPP_VJC, "VJ-Comp" },
{ IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
{ 0, NULL }
};
struct tok ipcpopt_compproto_subopt_values[] = {
{ 1, "RTP-Compression" },
{ 2, "Enhanced RTP-Compression" },
{ 0, NULL }
};
/* IP6CP Config Options */
#define IP6CP_IFID 1
@ -965,6 +979,7 @@ static int
print_ipcp_config_options(const u_char *p, int length)
{
int len, opt;
u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
if (length < 2)
return 0;
@ -999,11 +1014,62 @@ print_ipcp_config_options(const u_char *p, int length)
if (len < 4)
goto invlen;
TCHECK2(*(p + 2), 2);
if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
printf("VJ-Comp");
compproto = EXTRACT_16BITS(p+2);
printf("%s (0x%02x):",
tok2str(ipcpopt_compproto_values,"Unknown",compproto),
compproto);
switch (compproto) {
case PPP_VJC:
/* XXX: VJ-Comp parameters should be decoded */
} else
printf("unknown-comp-proto %04x", EXTRACT_16BITS(p + 2));
break;
case IPCPOPT_IPCOMP_HDRCOMP:
if (len < IPCPOPT_IPCOMP_MINLEN)
goto invlen;
TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN);
printf("\n\t TCP Space %u, non-TCP Space %u" \
", maxPeriod %u, maxTime %u, maxHdr %u",
EXTRACT_16BITS(p+4),
EXTRACT_16BITS(p+6),
EXTRACT_16BITS(p+8),
EXTRACT_16BITS(p+10),
EXTRACT_16BITS(p+12));
/* suboptions present ? */
if (len > IPCPOPT_IPCOMP_MINLEN) {
ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
p += IPCPOPT_IPCOMP_MINLEN;
printf("\n\t Suboptions, length %u", ipcomp_subopttotallen);
while (ipcomp_subopttotallen >= 2) {
TCHECK2(*p, 2);
ipcomp_subopt = *p;
ipcomp_suboptlen = *(p+1);
/* sanity check */
if (ipcomp_subopt == 0 ||
ipcomp_suboptlen == 0 )
break;
/* XXX: just display the suboptions for now */
printf("\n\t\t%s Suboption #%u, length %u",
tok2str(ipcpopt_compproto_subopt_values,
"Unknown",
ipcomp_subopt),
ipcomp_subopt,
ipcomp_suboptlen);
ipcomp_subopttotallen -= ipcomp_suboptlen;
p += ipcomp_suboptlen;
}
}
break;
default:
break;
}
break;
case IPCPOPT_ADDR: /* those options share the same format - fall through */