JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1998-2007 The TCPDUMP project |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that: (1) source code |
| 6 | * distributions retain the above copyright notice and this paragraph |
| 7 | * in its entirety, and (2) distributions including binary code include |
| 8 | * the above copyright notice and this paragraph in its entirety in |
| 9 | * the documentation or other materials provided with the distribution. |
| 10 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND |
| 11 | * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT |
| 12 | * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 13 | * FOR A PARTICULAR PURPOSE. |
| 14 | * |
| 15 | * Dynamic Trunk Protocol (DTP) |
| 16 | * |
| 17 | * Original code by Carles Kishimoto <carles.kishimoto@gmail.com> |
| 18 | */ |
| 19 | |
| 20 | #ifdef HAVE_CONFIG_H |
| 21 | #include "config.h" |
| 22 | #endif |
| 23 | |
| 24 | #include <tcpdump-stdinc.h> |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | |
| 29 | #include "interface.h" |
| 30 | #include "addrtoname.h" |
| 31 | #include "extract.h" |
| 32 | #include "nlpid.h" |
| 33 | |
| 34 | #define DTP_HEADER_LEN 1 |
| 35 | #define DTP_DOMAIN_TLV 0x0001 |
| 36 | #define DTP_STATUS_TLV 0x0002 |
| 37 | #define DTP_DTP_TYPE_TLV 0x0003 |
| 38 | #define DTP_NEIGHBOR_TLV 0x0004 |
| 39 | |
| 40 | static const struct tok dtp_tlv_values[] = { |
| 41 | { DTP_DOMAIN_TLV, "Domain TLV"}, |
| 42 | { DTP_STATUS_TLV, "Status TLV"}, |
| 43 | { DTP_DTP_TYPE_TLV, "DTP type TLV"}, |
| 44 | { DTP_NEIGHBOR_TLV, "Neighbor TLV"}, |
| 45 | { 0, NULL} |
| 46 | }; |
| 47 | |
| 48 | void |
| 49 | dtp_print (const u_char *pptr, u_int length) |
| 50 | { |
| 51 | int type, len; |
| 52 | const u_char *tptr; |
| 53 | |
| 54 | if (length < DTP_HEADER_LEN) |
| 55 | goto trunc; |
| 56 | |
| 57 | tptr = pptr; |
| 58 | |
| 59 | if (!TTEST2(*tptr, DTP_HEADER_LEN)) |
| 60 | goto trunc; |
| 61 | |
| 62 | printf("DTPv%u, length %u", |
| 63 | (*tptr), |
| 64 | length); |
| 65 | |
| 66 | /* |
| 67 | * In non-verbose mode, just print version. |
| 68 | */ |
| 69 | if (vflag < 1) { |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | tptr += DTP_HEADER_LEN; |
| 74 | |
| 75 | while (tptr < (pptr+length)) { |
| 76 | |
| 77 | if (!TTEST2(*tptr, 4)) |
| 78 | goto trunc; |
| 79 | |
| 80 | type = EXTRACT_16BITS(tptr); |
| 81 | len = EXTRACT_16BITS(tptr+2); |
| 82 | |
| 83 | /* infinite loop check */ |
| 84 | if (type == 0 || len == 0) { |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | printf("\n\t%s (0x%04x) TLV, length %u", |
| 89 | tok2str(dtp_tlv_values, "Unknown", type), |
| 90 | type, len); |
| 91 | |
| 92 | switch (type) { |
| 93 | case DTP_DOMAIN_TLV: |
| 94 | printf(", %s", tptr+4); |
| 95 | break; |
| 96 | |
| 97 | case DTP_STATUS_TLV: |
| 98 | case DTP_DTP_TYPE_TLV: |
| 99 | printf(", 0x%x", *(tptr+4)); |
| 100 | break; |
| 101 | |
| 102 | case DTP_NEIGHBOR_TLV: |
| 103 | printf(", %s", etheraddr_string(tptr+4)); |
| 104 | break; |
| 105 | |
| 106 | default: |
| 107 | break; |
| 108 | } |
| 109 | tptr += len; |
| 110 | } |
| 111 | |
| 112 | return; |
| 113 | |
| 114 | trunc: |
| 115 | printf("[|dtp]"); |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Local Variables: |
| 120 | * c-style: whitesmith |
| 121 | * c-basic-offset: 4 |
| 122 | * End: |
| 123 | */ |