1 /* 2 * Copyright (c) 2001 William C. Fenner. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code 7 * distributions retain the above copyright notice and this paragraph 8 * in its entirety, and (2) distributions including binary code include 9 * the above copyright notice and this paragraph in its entirety in 10 * the documentation or other materials provided with the distribution. 11 * The name of William C. Fenner may not be used to endorse or 12 * promote products derived from this software without specific prior 13 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 14 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 15 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 16 * FOR A PARTICULAR PURPOSE. 17 */ 18 19 #define NETDISSECT_REWORKED 20 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <tcpdump-stdinc.h> 25 26 #include "interface.h" 27 #include "addrtoname.h" 28 #include "extract.h" 29 30 #define MSDP_TYPE_MAX 7 31 32 void 33 msdp_print(netdissect_options *ndo, const u_char *sp, u_int length) 34 { 35 unsigned int type, len; 36 37 ND_TCHECK2(*sp, 3); 38 /* See if we think we're at the beginning of a compound packet */ 39 type = *sp; 40 len = EXTRACT_16BITS(sp + 1); 41 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) 42 goto trunc; /* not really truncated, but still not decodable */ 43 ND_PRINT((ndo, " msdp:")); 44 while (length > 0) { 45 ND_TCHECK2(*sp, 3); 46 type = *sp; 47 len = EXTRACT_16BITS(sp + 1); 48 if (len > 1400 || ndo->ndo_vflag) 49 ND_PRINT((ndo, " [len %u]", len)); 50 if (len < 3) 51 goto trunc; 52 sp += 3; 53 length -= 3; 54 switch (type) { 55 case 1: /* IPv4 Source-Active */ 56 case 3: /* IPv4 Source-Active Response */ 57 if (type == 1) 58 ND_PRINT((ndo, " SA")); 59 else 60 ND_PRINT((ndo, " SA-Response")); 61 ND_TCHECK(*sp); 62 ND_PRINT((ndo, " %u entries", *sp)); 63 if ((u_int)((*sp * 12) + 8) < len) { 64 ND_PRINT((ndo, " [w/data]")); 65 if (ndo->ndo_vflag > 1) { 66 ND_PRINT((ndo, " ")); 67 ip_print(ndo, sp + *sp * 12 + 8 - 3, 68 len - (*sp * 12 + 8)); 69 } 70 } 71 break; 72 case 2: 73 ND_PRINT((ndo, " SA-Request")); 74 ND_TCHECK2(*sp, 5); 75 ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1))); 76 break; 77 case 4: 78 ND_PRINT((ndo, " Keepalive")); 79 if (len != 3) 80 ND_PRINT((ndo, "[len=%d] ", len)); 81 break; 82 case 5: 83 ND_PRINT((ndo, " Notification")); 84 break; 85 default: 86 ND_PRINT((ndo, " [type=%d len=%d]", type, len)); 87 break; 88 } 89 sp += (len - 3); 90 length -= (len - 3); 91 } 92 return; 93 trunc: 94 ND_PRINT((ndo, " [|msdp]")); 95 } 96 97 /* 98 * Local Variables: 99 * c-style: whitesmith 100 * c-basic-offset: 8 101 * End: 102 */ 103
