#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.91.2.9 2006-02-02 12:36:46 hannes Exp $";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.91.2.12 2007-07-14 22:26:35 guy Exp $";
#endif
#include <tcpdump-stdinc.h>
#include "extract.h"
#include "bgp.h"
#include "l2vpn.h"
+#include "af.h"
struct bgp {
u_int8_t bgp_marker[16];
#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
-/* RFC1700 address family numbers */
-#define AFNUM_INET 1
-#define AFNUM_INET6 2
-#define AFNUM_NSAP 3
-#define AFNUM_HDLC 4
-#define AFNUM_BBN1822 5
-#define AFNUM_802 6
-#define AFNUM_E163 7
-#define AFNUM_E164 8
-#define AFNUM_F69 9
-#define AFNUM_X121 10
-#define AFNUM_IPX 11
-#define AFNUM_ATALK 12
-#define AFNUM_DECNET 13
-#define AFNUM_BANYAN 14
-#define AFNUM_E164NSAP 15
-#define AFNUM_VPLS 25
-/* draft-kompella-ppvpn-l2vpn */
-#define AFNUM_L2VPN 196 /* still to be approved by IANA */
-
-static struct tok bgp_afi_values[] = {
- { 0, "Reserved"},
- { AFNUM_INET, "IPv4"},
- { AFNUM_INET6, "IPv6"},
- { AFNUM_NSAP, "NSAP"},
- { AFNUM_HDLC, "HDLC"},
- { AFNUM_BBN1822, "BBN 1822"},
- { AFNUM_802, "802"},
- { AFNUM_E163, "E.163"},
- { AFNUM_E164, "E.164"},
- { AFNUM_F69, "F.69"},
- { AFNUM_X121, "X.121"},
- { AFNUM_IPX, "Novell IPX"},
- { AFNUM_ATALK, "Appletalk"},
- { AFNUM_DECNET, "Decnet IV"},
- { AFNUM_BANYAN, "Banyan Vines"},
- { AFNUM_E164NSAP, "E.164 with NSAP subaddress"},
- { AFNUM_L2VPN, "Layer-2 VPN"},
- { AFNUM_VPLS, "VPLS"},
- { 0, NULL},
-};
-
/* Extended community type - draft-ietf-idr-bgp-ext-communities-05 */
#define BGP_EXT_COM_RT_0 0x0002 /* Route Target,Format AS(2bytes):AN(4bytes) */
#define BGP_EXT_COM_RT_1 0x0102 /* Route Target,Format IP address:AN(2bytes) */
return -2;
}
+/*
+ * As I remember, some versions of systems have an snprintf() that
+ * returns -1 if the buffer would have overflowed. If the return
+ * value is negative, set buflen to 0, to indicate that we've filled
+ * the buffer up.
+ *
+ * If the return value is greater than buflen, that means that
+ * the buffer would have overflowed; again, set buflen to 0 in
+ * that case.
+ */
+#define UPDATE_BUF_BUFLEN(buf, buflen, strlen) \
+ if (strlen<0) \
+ buflen=0; \
+ else if ((u_int)strlen>buflen) \
+ buflen=0; \
+ else { \
+ buflen-=strlen; \
+ buf+=strlen; \
+ }
+
static int
decode_labeled_vpn_l2(const u_char *pptr, char *buf, u_int buflen)
{
tlen=plen;
pptr+=2;
TCHECK2(pptr[0],15);
+ buf[0]='\0';
strlen=snprintf(buf, buflen, "RD: %s, CE-ID: %u, Label-Block Offset: %u, Label Base %u",
bgp_vpn_rd_print(pptr),
EXTRACT_16BITS(pptr+8),
EXTRACT_16BITS(pptr+10),
EXTRACT_24BITS(pptr+12)>>4); /* the label is offsetted by 4 bits so lets shift it right */
+ UPDATE_BUF_BUFLEN(buf, buflen, strlen);
pptr+=15;
tlen-=15;
switch(tlv_type) {
case 1:
- strlen+=snprintf(buf+strlen,buflen-strlen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
- tlv_type,
- tlv_len);
+ if (buflen!=0) {
+ strlen=snprintf(buf,buflen, "\n\t\tcircuit status vector (%u) length: %u: 0x",
+ tlv_type,
+ tlv_len);
+ UPDATE_BUF_BUFLEN(buf, buflen, strlen);
+ }
ttlv_len=ttlv_len/8+1; /* how many bytes do we need to read ? */
while (ttlv_len>0) {
TCHECK(pptr[0]);
- strlen+=snprintf(buf+strlen,buflen-strlen, "%02x",*pptr++);
+ if (buflen!=0) {
+ strlen=snprintf(buf,buflen, "%02x",*pptr++);
+ UPDATE_BUF_BUFLEN(buf, buflen, strlen);
+ }
ttlv_len--;
}
break;
default:
- snprintf(buf+strlen,buflen-strlen, "\n\t\tunknown TLV #%u, length: %u",
- tlv_type,
- tlv_len);
+ if (buflen!=0) {
+ strlen=snprintf(buf,buflen, "\n\t\tunknown TLV #%u, length: %u",
+ tlv_type,
+ tlv_len);
+ UPDATE_BUF_BUFLEN(buf, buflen, strlen);
+ }
break;
}
- tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it tright */
+ tlen-=(tlv_len<<3); /* the tlv-length is expressed in bits so lets shift it right */
}
return plen+2;
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
- tok2strbuf(bgp_afi_values, "Unknown AFI", af,
+ tok2strbuf(af_values, "Unknown AFI", af,
tokbuf, sizeof(tokbuf)),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
safi = tptr[2];
printf("\n\t AFI: %s (%u), %sSAFI: %s (%u)",
- tok2strbuf(bgp_afi_values, "Unknown AFI", af,
+ tok2strbuf(af_values, "Unknown AFI", af,
tokbuf, sizeof(tokbuf)),
af,
(safi>128) ? "vendor specific " : "", /* 128 is meanwhile wellknown */
*(tptr+6),
tokbuf, sizeof(tokbuf)),
(*(tptr+7) & BGP_OSPF_RTYPE_METRIC_TYPE) ? "E2" : "",
- (*(tptr+6) == (BGP_OSPF_RTYPE_EXT ||BGP_OSPF_RTYPE_NSSA )) ? "E1" : "");
+ ((*(tptr+6) == BGP_OSPF_RTYPE_EXT) || (*(tptr+6) == BGP_OSPF_RTYPE_NSSA)) ? "E1" : "");
break;
case BGP_EXT_COM_L2INFO:
printf(": %s Control Flags [0x%02x]:MTU %u",
switch(cap_type) {
case BGP_CAPCODE_MP:
printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
- tok2strbuf(bgp_afi_values, "Unknown",
+ tok2strbuf(af_values, "Unknown",
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
cap_offset=4;
while(tcap_len>=4) {
printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
- tok2strbuf(bgp_afi_values,"Unknown",
+ tok2strbuf(af_values,"Unknown",
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
tptr = dat + BGP_NOTIFICATION_SIZE;
TCHECK2(*tptr, 7);
printf(", AFI %s (%u), SAFI %s (%u), Max Prefixes: %u",
- tok2strbuf(bgp_afi_values, "Unknown",
+ tok2strbuf(af_values, "Unknown",
EXTRACT_16BITS(tptr), tokbuf, sizeof(tokbuf)),
EXTRACT_16BITS(tptr),
tok2strbuf(bgp_safi_values, "Unknown", *(tptr+2),
bgp_route_refresh_header = (const struct bgp_route_refresh *)pptr;
printf("\n\t AFI %s (%u), SAFI %s (%u)",
- tok2strbuf(bgp_afi_values,"Unknown",
+ tok2strbuf(af_values,"Unknown",
/* this stinks but the compiler pads the structure
* weird */
EXTRACT_16BITS(&bgp_route_refresh_header->afi),
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