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[tcpdump] / print-geonet.c
index 8efc9b51a10cf33c8d1c680ddfb7a2c251b1a775..3f8ee07572d1b36da64199d1deb56840a49519f4 100644 (file)
 
 /* \summary: ISO CALM FAST and ETSI GeoNetworking printer */
 
-#ifdef HAVE_CONFIG_H
 #include <config.h>
-#endif
 
 #include "netdissect-stdinc.h"
 
+#define ND_LONGJMP_FROM_TCHECK
 #include "netdissect.h"
 #include "extract.h"
 #include "addrtoname.h"
@@ -59,46 +58,32 @@ static void
 print_btp_body(netdissect_options *ndo,
               const u_char *bp)
 {
-       u_int version;
        u_int msg_type;
-       const char *msg_type_str;
 
-       /* Assuming ItsDpuHeader */
-       /* 2 bytes ND_TCHECKed in geonet_print() */
-       version = GET_U_1(bp);
-       msg_type = GET_U_1(bp + 1);
-       msg_type_str = tok2str(msg_type_values, "unknown (%u)", msg_type);
+       /* Assuming ItsPduHeader */
+       ND_PRINT("; ItsPduHeader v:%u", GET_U_1(bp));
 
-       ND_PRINT("; ItsPduHeader v:%u t:%u-%s", version, msg_type, msg_type_str);
+       msg_type = GET_U_1(bp + 1);
+       ND_PRINT(" t:%u-%s", msg_type,
+                tok2str(msg_type_values, "unknown (%u)", msg_type));
 }
 
+/* EN 302 636-5-1 V2.2.1 Section 7.2: BTP-A header */
 static void
 print_btp(netdissect_options *ndo,
          const u_char *bp)
 {
-       /* 4 bytes ND_TCHECKed in geonet_print() */
-       uint16_t dest = GET_BE_U_2(bp + 0);
-       uint16_t src = GET_BE_U_2(bp + 2);
-       ND_PRINT("; BTP Dst:%u Src:%u", dest, src);
+       ND_PRINT("; BTP Dst:%u", GET_BE_U_2(bp + 0));
+       ND_PRINT(" Src:%u", GET_BE_U_2(bp + 2));
 }
 
-static int
+static void
 print_long_pos_vector(netdissect_options *ndo,
                      const u_char *bp)
 {
-       uint32_t lat, lon;
-
-       ND_TCHECK_LEN(bp, GEONET_ADDR_LEN);
        ND_PRINT("GN_ADDR:%s ", GET_LINKADDR_STRING(bp, LINKADDR_OTHER, GEONET_ADDR_LEN));
-
-       ND_TCHECK_8(bp + 12);
-       lat = GET_BE_U_4(bp + 12);
-       ND_PRINT("lat:%u ", lat);
-       lon = GET_BE_U_4(bp + 16);
-       ND_PRINT("lon:%u", lon);
-       return (0);
-trunc:
-       return -1;
+       ND_PRINT("lat:%u ", GET_BE_U_4(bp + 12));
+       ND_PRINT("lon:%u", GET_BE_U_4(bp + 16));
 }
 
 
@@ -127,10 +112,11 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
        ND_PRINT("; ");
 
        /* Process Common Header */
-       if (length < 36)
+       if (length < 36) {
+               ND_PRINT(" (common header length %u < 36)", length);
                goto invalid;
+       }
 
-       ND_TCHECK_8(bp);
        version = GET_U_1(bp) >> 4;
        next_hdr = GET_U_1(bp) & 0x0f;
        hdr_type = GET_U_1(bp + 1) >> 4;
@@ -178,10 +164,10 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
        ND_PRINT("HT:%u-%u-%s ", hdr_type, hdr_subtype, hdr_type_txt);
        ND_PRINT("HopLim:%u ", hop_limit);
        ND_PRINT("Payload:%u ", payload_length);
-       if (print_long_pos_vector(ndo, bp + 8) == -1)
-               goto trunc;
+       print_long_pos_vector(ndo, bp + 8);
 
        /* Skip Common Header */
+       ND_TCHECK_LEN(bp, 36);
        length -= 36;
        bp += 36;
 
@@ -233,8 +219,10 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
 
        /* Skip Extended headers */
        if (hdr_size >= 0) {
-               if (length < (u_int)hdr_size)
+               if (length < (u_int)hdr_size) {
+                       ND_PRINT(" (header size %d > %u)", hdr_size, length);
                        goto invalid;
+               }
                ND_TCHECK_LEN(bp, hdr_size);
                length -= hdr_size;
                bp += hdr_size;
@@ -243,9 +231,10 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
                                break;
                        case 1:
                        case 2: /* BTP A/B */
-                               if (length < 4)
+                               if (length < 4) {
+                                       ND_PRINT(" (BTP length %u < 4)", length);
                                        goto invalid;
-                               ND_TCHECK_4(bp);
+                               }
                                print_btp(ndo, bp);
                                length -= 4;
                                bp += 4;
@@ -257,7 +246,6 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
                                         * or was that just not
                                         * reporting genuine errors?
                                         */
-                                       ND_TCHECK_2(bp);
                                        print_btp_body(ndo, bp);
                                }
                                break;
@@ -272,10 +260,6 @@ geonet_print(netdissect_options *ndo, const u_char *bp, u_int length,
        return;
 
 invalid:
-       ND_PRINT(" Malformed (small) ");
+       nd_print_invalid(ndo);
        /* XXX - print the remaining data as hex? */
-       return;
-
-trunc:
-       nd_print_trunc(ndo);
 }