1 /* 2 * Decode and print Zephyr packets. 3 * 4 * http://web.mit.edu/zephyr/doc/protocol 5 * 6 * Copyright (c) 2001 Nickolai Zeldovich <kolya@MIT.EDU> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that: (1) source code 11 * distributions retain the above copyright notice and this paragraph 12 * in its entirety, and (2) distributions including binary code include 13 * the above copyright notice and this paragraph in its entirety in 14 * the documentation or other materials provided with the distribution. 15 * The name of the author(s) may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE. 21 */ 22 23 #ifndef lint 24 static const char rcsid[] _U_ = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-zephyr.c,v 1.10 2007-08-09 18:47:27 hannes Exp $"; 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 #include <string.h> 36 #include <stdlib.h> 37 38 #include "interface.h" 39 40 struct z_packet { 41 char *version; 42 int numfields; 43 int kind; 44 char *uid; 45 int port; 46 int auth; 47 int authlen; 48 char *authdata; 49 char *class; 50 char *inst; 51 char *opcode; 52 char *sender; 53 const char *recipient; 54 char *format; 55 int cksum; 56 int multi; 57 char *multi_uid; 58 /* Other fields follow here.. */ 59 }; 60 61 enum z_packet_type { 62 Z_PACKET_UNSAFE = 0, 63 Z_PACKET_UNACKED, 64 Z_PACKET_ACKED, 65 Z_PACKET_HMACK, 66 Z_PACKET_HMCTL, 67 Z_PACKET_SERVACK, 68 Z_PACKET_SERVNAK, 69 Z_PACKET_CLIENTACK, 70 Z_PACKET_STAT 71 }; 72 73 static struct tok z_types[] = { 74 { Z_PACKET_UNSAFE, "unsafe" }, 75 { Z_PACKET_UNACKED, "unacked" }, 76 { Z_PACKET_ACKED, "acked" }, 77 { Z_PACKET_HMACK, "hm-ack" }, 78 { Z_PACKET_HMCTL, "hm-ctl" }, 79 { Z_PACKET_SERVACK, "serv-ack" }, 80 { Z_PACKET_SERVNAK, "serv-nak" }, 81 { Z_PACKET_CLIENTACK, "client-ack" }, 82 { Z_PACKET_STAT, "stat" } 83 }; 84 85 char z_buf[256]; 86 87 static char * 88 parse_field(char **pptr, int *len) 89 { 90 char *s; 91 92 if (*len <= 0 || !pptr || !*pptr) 93 return NULL; 94 if (*pptr > (char *) snapend) 95 return NULL; 96 97 s = *pptr; 98 while (*pptr <= (char *) snapend && *len >= 0 && **pptr) { 99 (*pptr)++; 100 (*len)--; 101 } 102 (*pptr)++; 103 (*len)--; 104 if (*len < 0 || *pptr > (char *) snapend) 105 return NULL; 106 return s; 107 } 108 109 static const char * 110 z_triple(char *class, char *inst, const char *recipient) 111 { 112 if (!*recipient) 113 recipient = "*"; 114 snprintf(z_buf, sizeof(z_buf), "<%s,%s,%s>", class, inst, recipient); 115 z_buf[sizeof(z_buf)-1] = '\0'; 116 return z_buf; 117 } 118 119 static const char * 120 str_to_lower(char *string) 121 { 122 strncpy(z_buf, string, sizeof(z_buf)); 123 z_buf[sizeof(z_buf)-1] = '\0'; 124 125 string = z_buf; 126 while (*string) { 127 *string = tolower((unsigned char)(*string)); 128 string++; 129 } 130 131 return z_buf; 132 } 133 134 void 135 zephyr_print(const u_char *cp, int length) 136 { 137 struct z_packet z; 138 char *parse = (char *) cp; 139 int parselen = length; 140 char *s; 141 int lose = 0; 142 143 /* squelch compiler warnings */ 144 145 z.kind = 0; 146 z.class = 0; 147 z.inst = 0; 148 z.opcode = 0; 149 z.sender = 0; 150 z.recipient = 0; 151 152 #define PARSE_STRING \ 153 s = parse_field(&parse, &parselen); \ 154 if (!s) lose = 1; 155 156 #define PARSE_FIELD_INT(field) \ 157 PARSE_STRING \ 158 if (!lose) field = strtol(s, 0, 16); 159 160 #define PARSE_FIELD_STR(field) \ 161 PARSE_STRING \ 162 if (!lose) field = s; 163 164 PARSE_FIELD_STR(z.version); 165 if (lose) return; 166 if (strncmp(z.version, "ZEPH", 4)) 167 return; 168 169 PARSE_FIELD_INT(z.numfields); 170 PARSE_FIELD_INT(z.kind); 171 PARSE_FIELD_STR(z.uid); 172 PARSE_FIELD_INT(z.port); 173 PARSE_FIELD_INT(z.auth); 174 PARSE_FIELD_INT(z.authlen); 175 PARSE_FIELD_STR(z.authdata); 176 PARSE_FIELD_STR(z.class); 177 PARSE_FIELD_STR(z.inst); 178 PARSE_FIELD_STR(z.opcode); 179 PARSE_FIELD_STR(z.sender); 180 PARSE_FIELD_STR(z.recipient); 181 PARSE_FIELD_STR(z.format); 182 PARSE_FIELD_INT(z.cksum); 183 PARSE_FIELD_INT(z.multi); 184 PARSE_FIELD_STR(z.multi_uid); 185 186 if (lose) { 187 printf(" [|zephyr] (%d)", length); 188 return; 189 } 190 191 printf(" zephyr"); 192 if (strncmp(z.version+4, "0.2", 3)) { 193 printf(" v%s", z.version+4); 194 return; 195 } 196 197 printf(" %s", tok2str(z_types, "type %d", z.kind)); 198 if (z.kind == Z_PACKET_SERVACK) { 199 /* Initialization to silence warnings */ 200 char *ackdata = NULL; 201 PARSE_FIELD_STR(ackdata); 202 if (!lose && strcmp(ackdata, "SENT")) 203 printf("/%s", str_to_lower(ackdata)); 204 } 205 if (*z.sender) printf(" %s", z.sender); 206 207 if (!strcmp(z.class, "USER_LOCATE")) { 208 if (!strcmp(z.opcode, "USER_HIDE")) 209 printf(" hide"); 210 else if (!strcmp(z.opcode, "USER_UNHIDE")) 211 printf(" unhide"); 212 else 213 printf(" locate %s", z.inst); 214 return; 215 } 216 217 if (!strcmp(z.class, "ZEPHYR_ADMIN")) { 218 printf(" zephyr-admin %s", str_to_lower(z.opcode)); 219 return; 220 } 221 222 if (!strcmp(z.class, "ZEPHYR_CTL")) { 223 if (!strcmp(z.inst, "CLIENT")) { 224 if (!strcmp(z.opcode, "SUBSCRIBE") || 225 !strcmp(z.opcode, "SUBSCRIBE_NODEFS") || 226 !strcmp(z.opcode, "UNSUBSCRIBE")) { 227 228 printf(" %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "", 229 strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" : 230 "-nodefs"); 231 if (z.kind != Z_PACKET_SERVACK) { 232 /* Initialization to silence warnings */ 233 char *c = NULL, *i = NULL, *r = NULL; 234 PARSE_FIELD_STR(c); 235 PARSE_FIELD_STR(i); 236 PARSE_FIELD_STR(r); 237 if (!lose) printf(" %s", z_triple(c, i, r)); 238 } 239 return; 240 } 241 242 if (!strcmp(z.opcode, "GIMME")) { 243 printf(" ret"); 244 return; 245 } 246 247 if (!strcmp(z.opcode, "GIMMEDEFS")) { 248 printf(" gimme-defs"); 249 return; 250 } 251 252 if (!strcmp(z.opcode, "CLEARSUB")) { 253 printf(" clear-subs"); 254 return; 255 } 256 257 printf(" %s", str_to_lower(z.opcode)); 258 return; 259 } 260 261 if (!strcmp(z.inst, "HM")) { 262 printf(" %s", str_to_lower(z.opcode)); 263 return; 264 } 265 266 if (!strcmp(z.inst, "REALM")) { 267 if (!strcmp(z.opcode, "ADD_SUBSCRIBE")) 268 printf(" realm add-subs"); 269 if (!strcmp(z.opcode, "REQ_SUBSCRIBE")) 270 printf(" realm req-subs"); 271 if (!strcmp(z.opcode, "RLM_SUBSCRIBE")) 272 printf(" realm rlm-sub"); 273 if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE")) 274 printf(" realm rlm-unsub"); 275 return; 276 } 277 } 278 279 if (!strcmp(z.class, "HM_CTL")) { 280 printf(" hm_ctl %s", str_to_lower(z.inst)); 281 printf(" %s", str_to_lower(z.opcode)); 282 return; 283 } 284 285 if (!strcmp(z.class, "HM_STAT")) { 286 if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) { 287 printf(" get-client-stats"); 288 return; 289 } 290 } 291 292 if (!strcmp(z.class, "WG_CTL")) { 293 printf(" wg_ctl %s", str_to_lower(z.inst)); 294 printf(" %s", str_to_lower(z.opcode)); 295 return; 296 } 297 298 if (!strcmp(z.class, "LOGIN")) { 299 if (!strcmp(z.opcode, "USER_FLUSH")) { 300 printf(" flush_locs"); 301 return; 302 } 303 304 if (!strcmp(z.opcode, "NONE") || 305 !strcmp(z.opcode, "OPSTAFF") || 306 !strcmp(z.opcode, "REALM-VISIBLE") || 307 !strcmp(z.opcode, "REALM-ANNOUNCED") || 308 !strcmp(z.opcode, "NET-VISIBLE") || 309 !strcmp(z.opcode, "NET-ANNOUNCED")) { 310 printf(" set-exposure %s", str_to_lower(z.opcode)); 311 return; 312 } 313 } 314 315 if (!*z.recipient) 316 z.recipient = "*"; 317 318 printf(" to %s", z_triple(z.class, z.inst, z.recipient)); 319 if (*z.opcode) 320 printf(" op %s", z.opcode); 321 return; 322 } 323