document SIGUSR1 in manual page

[tcpdump] / print-udp.c

diff --git a/print-udp.c b/print-udp.c
index 605cd3c7ca8e01f8005bb2cf8f5c5d93f89791c2..c3edf6ef5de19b855731cd0c30bf07ab6a2d0275 100644 (file)
--- a/print-udp.c
+++ b/print-udp.c
@@ -367,7 +367,6 @@ udp_print(netdissect_options *ndo, register const u_char *bp, u_int length,
        else
                ip6 = NULL;
 #endif /*INET6*/
-       cp = (u_char *)(up + 1);
        if (!ND_TTEST(up->uh_dport)) {
                udpipaddr_print(ndo, ip, -1, -1);
                ND_PRINT((ndo, "[|udp]"));
@@ -382,20 +381,24 @@ udp_print(netdissect_options *ndo, register const u_char *bp, u_int length,
                ND_PRINT((ndo, "truncated-udp %d", length));
                return;
        }
+       ulen = EXTRACT_16BITS(&up->uh_ulen);
+       if (ulen < sizeof(struct udphdr)) {
+               udpipaddr_print(ndo, ip, sport, dport);
+               ND_PRINT((ndo, "truncated-udplength %d", ulen));
+               return;
+       }
+       ulen -= sizeof(struct udphdr);
        length -= sizeof(struct udphdr);
+       if (ulen < length)
+               length = ulen;
 
+       cp = (u_char *)(up + 1);
        if (cp > ndo->ndo_snapend) {
                udpipaddr_print(ndo, ip, sport, dport);
                ND_PRINT((ndo, "[|udp]"));
                return;
        }
 
-       ulen = EXTRACT_16BITS(&up->uh_ulen);
-       if (ulen < 8) {
-               udpipaddr_print(ndo, ip, sport, dport);
-               ND_PRINT((ndo, "truncated-udplength %d", ulen));
-               return;
-       }
        if (ndo->ndo_packettype) {
                register struct sunrpc_msg *rp;
                enum sunrpc_msg_type direction;
@@ -441,7 +444,7 @@ udp_print(netdissect_options *ndo, register const u_char *bp, u_int length,
 
                case PT_CNFP:
                        udpipaddr_print(ndo, ip, sport, dport);
-                       cnfp_print(ndo, cp, (const u_char *)ip);
+                       cnfp_print(ndo, cp);
                        break;
 
                case PT_TFTP:
@@ -676,12 +679,23 @@ udp_print(netdissect_options *ndo, register const u_char *bp, u_int length,
                        otv_print(ndo, (const u_char *)(up + 1), length);
                 else if (ISPORT(VXLAN_PORT))
                        vxlan_print(ndo, (const u_char *)(up + 1), length);
-               else
-                       ND_PRINT((ndo, "UDP, length %u",
-                           (uint32_t)(ulen - sizeof(*up))));
+                else if (ISPORT(GENEVE_PORT))
+                       geneve_print(ndo, (const u_char *)(up + 1), length);
+               else {
+                       if (ulen > length)
+                               ND_PRINT((ndo, "UDP, bad length %u > %u",
+                                   ulen, length));
+                       else
+                               ND_PRINT((ndo, "UDP, length %u", ulen));
+               }
 #undef ISPORT
-       } else
-               ND_PRINT((ndo, "UDP, length %u", (uint32_t)(ulen - sizeof(*up))));
+       } else {
+               if (ulen > length)
+                       ND_PRINT((ndo, "UDP, bad length %u > %u",
+                           ulen, length));
+               else
+                       ND_PRINT((ndo, "UDP, length %u", ulen));
+       }
 }