1 /* 2 * Decode and print Zephyr packets. 3 * 4 * http://web.mit.edu/zephyr/doc/protocol 5 * 6 * Copyright (c) 2001 Nickolai Zeldovich <kolya (at) 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 1.8.2.1 2005/04/21 06:51:24 guy 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 #define PARSE_STRING \ 144 s = parse_field(&parse, &parselen); \ 145 if (!s) lose = 1; 146 147 #define PARSE_FIELD_INT(field) \ 148 PARSE_STRING \ 149 if (!lose) field = strtol(s, 0, 16); 150 151 #define PARSE_FIELD_STR(field) \ 152 PARSE_STRING \ 153 if (!lose) field = s; 154 155 PARSE_FIELD_STR(z.version); 156 if (lose) return; 157 if (strncmp(z.version, "ZEPH", 4)) 158 return; 159 160 PARSE_FIELD_INT(z.numfields); 161 PARSE_FIELD_INT(z.kind); 162 PARSE_FIELD_STR(z.uid); 163 PARSE_FIELD_INT(z.port); 164 PARSE_FIELD_INT(z.auth); 165 PARSE_FIELD_INT(z.authlen); 166 PARSE_FIELD_STR(z.authdata); 167 PARSE_FIELD_STR(z.class); 168 PARSE_FIELD_STR(z.inst); 169 PARSE_FIELD_STR(z.opcode); 170 PARSE_FIELD_STR(z.sender); 171 PARSE_FIELD_STR(z.recipient); 172 PARSE_FIELD_STR(z.format); 173 PARSE_FIELD_INT(z.cksum); 174 PARSE_FIELD_INT(z.multi); 175 PARSE_FIELD_STR(z.multi_uid); 176 177 if (lose) { 178 printf(" [|zephyr] (%d)", length); 179 return; 180 } 181 182 printf(" zephyr"); 183 if (strncmp(z.version+4, "0.2", 3)) { 184 printf(" v%s", z.version+4); 185 return; 186 } 187 188 printf(" %s", tok2str(z_types, "type %d", z.kind)); 189 if (z.kind == Z_PACKET_SERVACK) { 190 /* Initialization to silence warnings */ 191 char *ackdata = NULL; 192 PARSE_FIELD_STR(ackdata); 193 if (!lose && strcmp(ackdata, "SENT")) 194 printf("/%s", str_to_lower(ackdata)); 195 } 196 if (*z.sender) printf(" %s", z.sender); 197 198 if (!strcmp(z.class, "USER_LOCATE")) { 199 if (!strcmp(z.opcode, "USER_HIDE")) 200 printf(" hide"); 201 else if (!strcmp(z.opcode, "USER_UNHIDE")) 202 printf(" unhide"); 203 else 204 printf(" locate %s", z.inst); 205 return; 206 } 207 208 if (!strcmp(z.class, "ZEPHYR_ADMIN")) { 209 printf(" zephyr-admin %s", str_to_lower(z.opcode)); 210 return; 211 } 212 213 if (!strcmp(z.class, "ZEPHYR_CTL")) { 214 if (!strcmp(z.inst, "CLIENT")) { 215 if (!strcmp(z.opcode, "SUBSCRIBE") || 216 !strcmp(z.opcode, "SUBSCRIBE_NODEFS") || 217 !strcmp(z.opcode, "UNSUBSCRIBE")) { 218 219 printf(" %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "", 220 strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" : 221 "-nodefs"); 222 if (z.kind != Z_PACKET_SERVACK) { 223 /* Initialization to silence warnings */ 224 char *c = NULL, *i = NULL, *r = NULL; 225 PARSE_FIELD_STR(c); 226 PARSE_FIELD_STR(i); 227 PARSE_FIELD_STR(r); 228 if (!lose) printf(" %s", z_triple(c, i, r)); 229 } 230 return; 231 } 232 233 if (!strcmp(z.opcode, "GIMME")) { 234 printf(" ret"); 235 return; 236 } 237 238 if (!strcmp(z.opcode, "GIMMEDEFS")) { 239 printf(" gimme-defs"); 240 return; 241 } 242 243 if (!strcmp(z.opcode, "CLEARSUB")) { 244 printf(" clear-subs"); 245 return; 246 } 247 248 printf(" %s", str_to_lower(z.opcode)); 249 return; 250 } 251 252 if (!strcmp(z.inst, "HM")) { 253 printf(" %s", str_to_lower(z.opcode)); 254 return; 255 } 256 257 if (!strcmp(z.inst, "REALM")) { 258 if (!strcmp(z.opcode, "ADD_SUBSCRIBE")) 259 printf(" realm add-subs"); 260 if (!strcmp(z.opcode, "REQ_SUBSCRIBE")) 261 printf(" realm req-subs"); 262 if (!strcmp(z.opcode, "RLM_SUBSCRIBE")) 263 printf(" realm rlm-sub"); 264 if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE")) 265 printf(" realm rlm-unsub"); 266 return; 267 } 268 } 269 270 if (!strcmp(z.class, "HM_CTL")) { 271 printf(" hm_ctl %s", str_to_lower(z.inst)); 272 printf(" %s", str_to_lower(z.opcode)); 273 return; 274 } 275 276 if (!strcmp(z.class, "HM_STAT")) { 277 if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) { 278 printf(" get-client-stats"); 279 return; 280 } 281 } 282 283 if (!strcmp(z.class, "WG_CTL")) { 284 printf(" wg_ctl %s", str_to_lower(z.inst)); 285 printf(" %s", str_to_lower(z.opcode)); 286 return; 287 } 288 289 if (!strcmp(z.class, "LOGIN")) { 290 if (!strcmp(z.opcode, "USER_FLUSH")) { 291 printf(" flush_locs"); 292 return; 293 } 294 295 if (!strcmp(z.opcode, "NONE") || 296 !strcmp(z.opcode, "OPSTAFF") || 297 !strcmp(z.opcode, "REALM-VISIBLE") || 298 !strcmp(z.opcode, "REALM-ANNOUNCED") || 299 !strcmp(z.opcode, "NET-VISIBLE") || 300 !strcmp(z.opcode, "NET-ANNOUNCED")) { 301 printf(" set-exposure %s", str_to_lower(z.opcode)); 302 return; 303 } 304 } 305 306 if (!*z.recipient) 307 z.recipient = "*"; 308 309 printf(" to %s", z_triple(z.class, z.inst, z.recipient)); 310 if (*z.opcode) 311 printf(" op %s", z.opcode); 312 return; 313 } 314
