#ifndef lint
static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.159 2006-05-12 02:10:21 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.165 2008-08-16 13:38:15 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "extract.h"
#include "gmpls.h"
#include "oui.h"
+#include "signature.h"
/*
* IS-IS is defined in ISO 10589. Look there for protocol definitions.
{ ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
{ ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
{ ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
- { ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"},
+ { ISIS_LSP_TYPE_LEVEL_2, "L2 IS"},
{ 0, NULL }
};
u_int8_t neighbor_extd_local_circuit_id[4];
};
-static int osi_cksum(const u_int8_t *, u_int);
+static void osi_print_cksum(const u_int8_t *pptr, u_int16_t checksum,
+ u_int checksum_offset, u_int length);
static int clnp_print(const u_int8_t *, u_int);
static void esis_print(const u_int8_t *, u_int);
static int isis_print(const u_int8_t *, u_int);
}
printf("%slength %u",eflag ? "" : ", ",length);
- printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x ",
+ printf("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x",
tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type),
clnp_header->length_indicator,
clnp_header->version,
EXTRACT_16BITS(clnp_header->segment_length),
EXTRACT_16BITS(clnp_header->cksum));
- /* do not attempt to verify the checksum if it is zero */
- if (EXTRACT_16BITS(clnp_header->cksum) == 0)
- printf("(unverified)");
- else printf("(%s)", osi_cksum(optr, clnp_header->length_indicator) ? "incorrect" : "correct");
+ osi_print_cksum(optr, EXTRACT_16BITS(clnp_header->cksum), 7,
+ clnp_header->length_indicator);
printf("\n\tFlags [%s]",
bittok2str(clnp_flag_values,"none",clnp_flags));
esis_pdu_type);
printf(", v: %u%s", esis_header->version, esis_header->version == ESIS_VERSION ? "" : "unsupported" );
- printf(", checksum: 0x%04x ", EXTRACT_16BITS(esis_header->cksum));
- /* do not attempt to verify the checksum if it is zero */
- if (EXTRACT_16BITS(esis_header->cksum) == 0)
- printf("(unverified)");
- else
- printf("(%s)", osi_cksum(pptr, li) ? "incorrect" : "correct");
+ printf(", checksum: 0x%04x", EXTRACT_16BITS(esis_header->cksum));
+
+ osi_print_cksum(pptr, EXTRACT_16BITS(esis_header->cksum), 7, li);
printf(", holding time: %us, length indicator: %u",EXTRACT_16BITS(esis_header->holdtime),li);
const struct isis_iih_lan_header *header_iih_lan;
const struct isis_iih_ptp_header *header_iih_ptp;
- const struct isis_lsp_header *header_lsp;
+ struct isis_lsp_header *header_lsp;
const struct isis_csnp_header *header_csnp;
const struct isis_psnp_header *header_psnp;
const u_int8_t *optr, *pptr, *tptr;
u_short packet_len,pdu_len;
u_int i,vendor_id;
+ int sigcheck;
packet_len=length;
optr = p; /* initialize the _o_riginal pointer to the packet start -
- need it for parsing the checksum TLV */
+ need it for parsing the checksum TLV and authentication
+ TLV verification */
isis_header = (const struct isis_common_header *)p;
TCHECK(*isis_header);
pptr = p+(ISIS_COMMON_HEADER_SIZE);
header_iih_lan = (const struct isis_iih_lan_header *)pptr;
header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
- header_lsp = (const struct isis_lsp_header *)pptr;
+ header_lsp = (struct isis_lsp_header *)pptr;
header_csnp = (const struct isis_csnp_header *)pptr;
header_psnp = (const struct isis_psnp_header *)pptr;
EXTRACT_16BITS(header_lsp->remaining_lifetime),
EXTRACT_16BITS(header_lsp->checksum));
- /* if this is a purge do not attempt to verify the checksum */
- if ( EXTRACT_16BITS(header_lsp->remaining_lifetime) == 0 &&
- EXTRACT_16BITS(header_lsp->checksum) == 0)
- printf(" (purged)");
- else
- /* verify the checksum -
- * checking starts at the lsp-id field at byte position [12]
- * hence the length needs to be reduced by 12 bytes */
- printf(" (%s)", (osi_cksum((u_int8_t *)header_lsp->lsp_id, length-12)) ? "incorrect" : "correct");
+
+ osi_print_cksum((u_int8_t *)header_lsp->lsp_id,
+ EXTRACT_16BITS(header_lsp->checksum), 12, length-12);
+
+ /*
+ * Clear checksum and lifetime prior to signature verification.
+ */
+ header_lsp->checksum[0] = 0;
+ header_lsp->checksum[1] = 0;
+ header_lsp->remaining_lifetime[0] = 0;
+ header_lsp->remaining_lifetime[1] = 0;
+
printf(", PDU length: %u, Flags: [ %s",
pdu_len,
tlv_len);
if (tlv_len == 0) /* something is malformed */
- break;
+ continue;
/* now check if we have a decoder otherwise do a hexdump at the end*/
switch (tlv_type) {
break;
case ISIS_TLV_MT_IS_REACH:
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) /* did something go wrong ? */
+ goto trunctlv;
+ tptr+=mt_len;
+ tmp-=mt_len;
while (tmp >= 2+NODE_ID_LEN+3+1) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
-
ext_is_len = isis_print_ext_is_reach(tptr,"\n\t ",tlv_type);
if (ext_is_len == 0) /* did something go wrong ? */
goto trunctlv;
break;
case ISIS_TLV_MT_IP_REACH:
- while (tmp>0) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) { /* did something go wrong ? */
+ goto trunctlv;
+ }
+ tptr+=mt_len;
+ tmp-=mt_len;
+ while (tmp>0) {
ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
break;
case ISIS_TLV_MT_IP6_REACH:
- while (tmp>0) {
- mt_len = isis_print_mtid(tptr, "\n\t ");
- if (mt_len == 0) /* did something go wrong ? */
- goto trunctlv;
- tptr+=mt_len;
- tmp-=mt_len;
+ mt_len = isis_print_mtid(tptr, "\n\t ");
+ if (mt_len == 0) { /* did something go wrong ? */
+ goto trunctlv;
+ }
+ tptr+=mt_len;
+ tmp-=mt_len;
+ while (tmp>0) {
ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t ", AF_INET6);
if (ext_ip_len == 0) /* did something go wrong ? */
goto trunctlv;
}
if (tlv_len != ISIS_SUBTLV_AUTH_MD5_LEN+1)
printf(", (malformed subTLV) ");
+
+#ifdef HAVE_LIBCRYPTO
+ sigcheck = signature_verify(optr, length,
+ (unsigned char *)tptr + 1);
+#else
+ sigcheck = CANT_CHECK_SIGNATURE;
+#endif
+ printf(" (%s)", tok2str(signature_check_values, "Unknown", sigcheck));
+
break;
case ISIS_SUBTLV_AUTH_PRIVATE:
default:
* to avoid conflicts the checksum TLV is zeroed.
* see rfc3358 for details
*/
- if (EXTRACT_16BITS(tptr) == 0)
- printf("(unverified)");
- else printf("(%s)", osi_cksum(optr, length) ? "incorrect" : "correct");
+ osi_print_cksum(optr, EXTRACT_16BITS(tptr), tptr-optr, length);
break;
case ISIS_TLV_MT_SUPPORTED:
return(1);
}
-/*
- * Verify the checksum. See 8473-1, Appendix C, section C.4.
- */
-
-static int
-osi_cksum(const u_int8_t *tptr, u_int len)
+static void
+osi_print_cksum (const u_int8_t *pptr, u_int16_t checksum,
+ u_int checksum_offset, u_int length)
{
- int32_t c0 = 0, c1 = 0;
+ u_int16_t calculated_checksum;
- while ((int)--len >= 0) {
- c0 += *tptr++;
- c0 %= 255;
- c1 += c0;
- c1 %= 255;
- }
- return (c0 | c1);
+ /* do not attempt to verify the checksum if it is zero */
+ if (!checksum) {
+ printf("(unverified)");
+ } else {
+ calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
+ if (checksum == calculated_checksum) {
+ printf(" (correct)");
+ } else {
+ printf(" (incorrect should be 0x%04x)", calculated_checksum);
+ }
+ }
}
-
/*
* Local Variables:
* c-style: whitesmith
projects / tcpdump / blobdiff