add boundary, infinite loop checks

[tcpdump] / print-ip6.c

diff --git a/print-ip6.c b/print-ip6.c
index 87364717c5e9b309adeb1b0b9e9a6d7eb6607b2b..05db9d97da2d3d214bb9e874dd4f0f123345b2d0 100644 (file)
--- a/print-ip6.c
+++ b/print-ip6.c
@@ -21,7 +21,7 @@
 
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.40 2003-11-24 20:30:52 guy Exp $";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.47 2005-04-06 21:32:40 mcr Exp $";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -63,16 +63,43 @@ ip6_print(register const u_char *bp, register u_int length)
 
        TCHECK(*ip6);
        if (length < sizeof (struct ip6_hdr)) {
-               (void)printf("truncated-ip6 %d", length);
+               (void)printf("truncated-ip6 %u", length);
                return;
        }
 
+        if (!eflag)
+            printf("IP6 ");
+
        payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
        len = payload_len + sizeof(struct ip6_hdr);
        if (length < len)
-               (void)printf("truncated-ip6 - %d bytes missing!",
+               (void)printf("truncated-ip6 - %u bytes missing!",
                        len - length);
 
+        if (vflag) {
+            flow = EXTRACT_32BITS(&ip6->ip6_flow);
+            printf("(");
+#if 0
+            /* rfc1883 */
+            if (flow & 0x0f000000)
+               (void)printf("pri 0x%02x, ", (flow & 0x0f000000) >> 24);
+            if (flow & 0x00ffffff)
+               (void)printf("flowlabel 0x%06x, ", flow & 0x00ffffff);
+#else
+            /* RFC 2460 */
+            if (flow & 0x0ff00000)
+               (void)printf("class 0x%02x, ", (flow & 0x0ff00000) >> 20);
+            if (flow & 0x000fffff)
+               (void)printf("flowlabel 0x%05x, ", flow & 0x000fffff);
+#endif
+
+            (void)printf("hlim %u, next-header: %s (%u), length: %u) ",
+                         ip6->ip6_hlim,
+                         tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
+                         ip6->ip6_nxt,
+                         payload_len);
+        }
+
        /*
         * Cut off the snapshot length to the end of the IP payload.
         */
@@ -106,7 +133,7 @@ ip6_print(register const u_char *bp, register u_int length)
                case IPPROTO_FRAGMENT:
                        advance = frag6_print(cp, (const u_char *)ip6);
                        if (snapend <= cp + advance)
-                               goto end;
+                               return;
                        nh = *cp;
                        fragmented = 1;
                        break;
@@ -125,23 +152,23 @@ ip6_print(register const u_char *bp, register u_int length)
                         */
                        advance = mobility_print(cp, (const u_char *)ip6);
                        nh = *cp;
-                       goto end;
+                       return;
                case IPPROTO_ROUTING:
                        advance = rt6_print(cp, (const u_char *)ip6);
                        nh = *cp;
                        break;
                case IPPROTO_SCTP:
                        sctp_print(cp, (const u_char *)ip6, len);
-                       goto end;
+                       return;
                case IPPROTO_TCP:
                        tcp_print(cp, len, (const u_char *)ip6, fragmented);
-                       goto end;
+                       return;
                case IPPROTO_UDP:
                        udp_print(cp, len, (const u_char *)ip6, fragmented);
-                       goto end;
+                       return;
                case IPPROTO_ICMPV6:
                        icmp6_print(cp, len, (const u_char *)ip6, fragmented);
-                       goto end;
+                       return;
                case IPPROTO_AH:
                        advance = ah_print(cp);
                        nh = *cp;
@@ -149,7 +176,7 @@ ip6_print(register const u_char *bp, register u_int length)
                case IPPROTO_ESP:
                    {
                        int enh, padlen;
-                       advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
+                       advance = esp_print(gndo, cp, len, (const u_char *)ip6, &enh, &padlen);
                        nh = enh & 0xff;
                        len -= padlen;
                        break;
@@ -164,56 +191,29 @@ ip6_print(register const u_char *bp, register u_int length)
 
                case IPPROTO_PIM:
                        pim_print(cp, len);
-                       goto end;
+                       return;
                case IPPROTO_OSPF:
                        ospf6_print(cp, len);
-                       goto end;
+                       return;
 
                case IPPROTO_IPV6:
                        ip6_print(cp, len);
-                       goto end;
+                       return;
 
                case IPPROTO_IPV4:
-                       ip_print(cp, len);
-                       goto end;
+                       ip_print(gndo, cp, len);
+                       return;
 
                case IPPROTO_NONE:
                        (void)printf("no next header");
-                       goto end;
+                       return;
 
                default:
                        (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
-                       goto end;
+                       return;
                }
        }
 
- end:
-
-       flow = EXTRACT_32BITS(&ip6->ip6_flow);
-#if 0
-       /* rfc1883 */
-       if (flow & 0x0f000000)
-               (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
-       if (flow & 0x00ffffff)
-               (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
-#else
-       /* RFC 2460 */
-       if (flow & 0x0ff00000)
-               (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
-       if (flow & 0x000fffff)
-               (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
-#endif
-
-       if (ip6->ip6_hlim <= 1)
-               (void)printf(" [hlim %u]", ip6->ip6_hlim);
-
-       if (vflag) {
-               printf(" (");
-               (void)printf("len %u", payload_len);
-               if (ip6->ip6_hlim > 1)
-                       (void)printf(", hlim %d", (int)ip6->ip6_hlim);
-               printf(")");
-       }
        return;
 trunc:
        (void)printf("[|ip6]");