X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/60a835d80f4b6c12dbe2d38fe4ca2de16f3302dc..a9d6fee301938c5a1d2033bf8b8f09db19efca5b:/print-isoclns.c?ds=sidebyside

diff --git a/print-isoclns.c b/print-isoclns.c
index bd109ab9..5944286a 100644
--- a/print-isoclns.c
+++ b/print-isoclns.c
@@ -24,7 +24,6 @@
  * complete IS-IS & CLNP support.
  */
 
-#define NETDISSECT_REWORKED
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -103,6 +102,7 @@ static const struct tok isis_pdu_values[] = {
 #define ISIS_TLV_AUTH                10  /* iso10589, rfc3567 */
 #define ISIS_TLV_CHECKSUM            12  /* rfc3358 */
 #define ISIS_TLV_CHECKSUM_MINLEN 2
+#define ISIS_TLV_POI                 13  /* rfc6232 */
 #define ISIS_TLV_LSP_BUFFERSIZE      14  /* iso10589 rev2 */
 #define ISIS_TLV_LSP_BUFFERSIZE_MINLEN 2
 #define ISIS_TLV_EXT_IS_REACH        22  /* draft-ietf-isis-traffic-05 */
@@ -152,6 +152,7 @@ static const struct tok isis_tlv_values[] = {
     { ISIS_TLV_LSP,                "LSP entries"},
     { ISIS_TLV_AUTH,               "Authentication"},
     { ISIS_TLV_CHECKSUM,           "Checksum"},
+    { ISIS_TLV_POI,                "Purge Originator Identifier"},
     { ISIS_TLV_LSP_BUFFERSIZE,     "LSP Buffersize"},
     { ISIS_TLV_EXT_IS_REACH,       "Extended IS Reachability"},
     { ISIS_TLV_IS_ALIAS_ID,        "IS Alias ID"},
@@ -559,8 +560,8 @@ struct isis_tlv_ptp_adj {
     uint8_t neighbor_extd_local_circuit_id[4];
 };
 
-static void osi_print_cksum(netdissect_options *, const uint8_t *pptr, uint16_t checksum,
-                            u_int checksum_offset, u_int length);
+static void osi_print_cksum(netdissect_options *, const uint8_t *pptr,
+			    uint16_t checksum, int checksum_offset, int length);
 static int clnp_print(netdissect_options *, const uint8_t *, u_int);
 static void esis_print(netdissect_options *, const uint8_t *, u_int);
 static int isis_print(netdissect_options *, const uint8_t *, u_int);
@@ -1341,7 +1342,7 @@ isis_print_mt_port_cap_subtlv(netdissect_options *ndo,
         if (!ND_TTEST2(*(tptr), ISIS_SUBTLV_SPB_MCID_MIN_LEN))
           goto trunctlv;
 
-        subtlv_spb_mcid = (struct isis_subtlv_spb_mcid *)tptr;
+        subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr;
 
         ND_PRINT((ndo,  "\n\t         MCID: "));
         isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid));
@@ -2886,6 +2887,22 @@ isis_print(netdissect_options *ndo,
             osi_print_cksum(ndo, optr, EXTRACT_16BITS(tptr), tptr-optr, length);
 	    break;
 
+	case ISIS_TLV_POI:
+	    if (tlv_len >= SYSTEM_ID_LEN + 1) {
+		if (!ND_TTEST2(*tptr, SYSTEM_ID_LEN + 1))
+		    goto trunctlv;
+		ND_PRINT((ndo, "\n\t      Purge Originator System-ID: %s",
+		       isis_print_id(tptr + 1, SYSTEM_ID_LEN)));
+	    }
+
+	    if (tlv_len == 2 * SYSTEM_ID_LEN + 1) {
+		if (!ND_TTEST2(*tptr, 2 * SYSTEM_ID_LEN + 1))
+		    goto trunctlv;
+		ND_PRINT((ndo, "\n\t      Received from System-ID: %s",
+		       isis_print_id(tptr + SYSTEM_ID_LEN + 1, SYSTEM_ID_LEN)));
+	    }
+	    break;
+
 	case ISIS_TLV_MT_SUPPORTED:
             if (tmp < ISIS_TLV_MT_SUPPORTED_MINLEN)
                 break;
@@ -3075,21 +3092,38 @@ isis_print(netdissect_options *ndo,
 }
 
 static void
-osi_print_cksum(netdissect_options *ndo,
-                const uint8_t *pptr, uint16_t checksum,
-                    u_int checksum_offset, u_int length)
+osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr,
+	        uint16_t checksum, int checksum_offset, int length)
 {
         uint16_t calculated_checksum;
 
-        /* do not attempt to verify the checksum if it is zero */
-        if (!checksum) {
-                ND_PRINT((ndo, "(unverified)"));
+        /* do not attempt to verify the checksum if it is zero,
+         * if the total length is nonsense,
+         * if the offset is nonsense,
+         * or the base pointer is not sane
+         */
+        if (!checksum
+            || length < 0
+            || checksum_offset < 0
+            || length > ndo->ndo_snaplen
+            || checksum_offset > ndo->ndo_snaplen
+            || checksum_offset > length) {
+                ND_PRINT((ndo, " (unverified)"));
         } else {
+                const char *truncated = "trunc";
+#if 0
+                printf("\nosi_print_cksum: %p %u %u %u\n", pptr, checksum_offset, length, ndo->ndo_snaplen);
+                ND_TCHECK2(pptr, checksum_offset+length);
+#endif
                 calculated_checksum = create_osi_cksum(pptr, checksum_offset, length);
                 if (checksum == calculated_checksum) {
                         ND_PRINT((ndo, " (correct)"));
                 } else {
-                        ND_PRINT((ndo, " (incorrect should be 0x%04x)", calculated_checksum));
+                        truncated = "incorrect";
+#if 0
+                        trunc:
+#endif
+                        ND_PRINT((ndo, " (%s should be 0x%04x)", truncated, calculated_checksum));
                 }
         }
 }