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 #include <sys/cdefs.h> 24 #ifndef lint 25 __RCSID("$NetBSD: print-zephyr.c,v 1.7 2017/02/05 04:05:05 spz Exp $"); 26 #endif 27 28 /* \summary: Zephyr printer */ 29 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <netdissect-stdinc.h> 35 36 #include <stdio.h> 37 #include <string.h> 38 #include <stdlib.h> 39 40 #include "netdissect.h" 41 42 struct z_packet { 43 const char *version; 44 int numfields; 45 int kind; 46 const char *uid; 47 int port; 48 int auth; 49 int authlen; 50 const char *authdata; 51 const char *class; 52 const char *inst; 53 const char *opcode; 54 const char *sender; 55 const char *recipient; 56 const char *format; 57 int cksum; 58 int multi; 59 const char *multi_uid; 60 /* Other fields follow here.. */ 61 }; 62 63 enum z_packet_type { 64 Z_PACKET_UNSAFE = 0, 65 Z_PACKET_UNACKED, 66 Z_PACKET_ACKED, 67 Z_PACKET_HMACK, 68 Z_PACKET_HMCTL, 69 Z_PACKET_SERVACK, 70 Z_PACKET_SERVNAK, 71 Z_PACKET_CLIENTACK, 72 Z_PACKET_STAT 73 }; 74 75 static const struct tok z_types[] = { 76 { Z_PACKET_UNSAFE, "unsafe" }, 77 { Z_PACKET_UNACKED, "unacked" }, 78 { Z_PACKET_ACKED, "acked" }, 79 { Z_PACKET_HMACK, "hm-ack" }, 80 { Z_PACKET_HMCTL, "hm-ctl" }, 81 { Z_PACKET_SERVACK, "serv-ack" }, 82 { Z_PACKET_SERVNAK, "serv-nak" }, 83 { Z_PACKET_CLIENTACK, "client-ack" }, 84 { Z_PACKET_STAT, "stat" } 85 }; 86 87 static char z_buf[256]; 88 89 static const char * 90 parse_field(netdissect_options *ndo, const char **pptr, int *len) 91 { 92 const char *s; 93 94 if (*len <= 0 || !pptr || !*pptr) 95 return NULL; 96 if (*pptr > (const char *) ndo->ndo_snapend) 97 return NULL; 98 99 s = *pptr; 100 while (*pptr <= (const char *) ndo->ndo_snapend && *len >= 0 && **pptr) { 101 (*pptr)++; 102 (*len)--; 103 } 104 (*pptr)++; 105 (*len)--; 106 if (*len < 0 || *pptr > (const char *) ndo->ndo_snapend) 107 return NULL; 108 return s; 109 } 110 111 static const char * 112 z_triple(const char *class, const char *inst, const char *recipient) 113 { 114 if (!*recipient) 115 recipient = "*"; 116 snprintf(z_buf, sizeof(z_buf), "<%s,%s,%s>", class, inst, recipient); 117 z_buf[sizeof(z_buf)-1] = '\0'; 118 return z_buf; 119 } 120 121 static const char * 122 str_to_lower(const char *string) 123 { 124 char *zb_string; 125 126 strncpy(z_buf, string, sizeof(z_buf)); 127 z_buf[sizeof(z_buf)-1] = '\0'; 128 129 zb_string = z_buf; 130 while (*zb_string) { 131 *zb_string = tolower((unsigned char)(*zb_string)); 132 zb_string++; 133 } 134 135 return z_buf; 136 } 137 138 void 139 zephyr_print(netdissect_options *ndo, const u_char *cp, int length) 140 { 141 struct z_packet z; 142 const char *parse = (const char *) cp; 143 int parselen = length; 144 const char *s; 145 int lose = 0; 146 147 /* squelch compiler warnings */ 148 149 z.kind = 0; 150 z.class = 0; 151 z.inst = 0; 152 z.opcode = 0; 153 z.sender = 0; 154 z.recipient = 0; 155 156 memset(&z, 0, sizeof(z)); /* XXX gcc */ 157 158 #define PARSE_STRING \ 159 s = parse_field(ndo, &parse, &parselen); \ 160 if (!s) lose = 1; 161 162 #define PARSE_FIELD_INT(field) \ 163 PARSE_STRING \ 164 if (!lose) field = strtol(s, 0, 16); 165 166 #define PARSE_FIELD_STR(field) \ 167 PARSE_STRING \ 168 if (!lose) field = s; 169 170 PARSE_FIELD_STR(z.version); 171 if (lose) return; 172 if (strncmp(z.version, "ZEPH", 4)) 173 return; 174 175 PARSE_FIELD_INT(z.numfields); 176 PARSE_FIELD_INT(z.kind); 177 PARSE_FIELD_STR(z.uid); 178 PARSE_FIELD_INT(z.port); 179 PARSE_FIELD_INT(z.auth); 180 PARSE_FIELD_INT(z.authlen); 181 PARSE_FIELD_STR(z.authdata); 182 PARSE_FIELD_STR(z.class); 183 PARSE_FIELD_STR(z.inst); 184 PARSE_FIELD_STR(z.opcode); 185 PARSE_FIELD_STR(z.sender); 186 PARSE_FIELD_STR(z.recipient); 187 PARSE_FIELD_STR(z.format); 188 PARSE_FIELD_INT(z.cksum); 189 PARSE_FIELD_INT(z.multi); 190 PARSE_FIELD_STR(z.multi_uid); 191 192 if (lose) { 193 ND_PRINT((ndo, " [|zephyr] (%d)", length)); 194 return; 195 } 196 197 ND_PRINT((ndo, " zephyr")); 198 if (strncmp(z.version+4, "0.2", 3)) { 199 ND_PRINT((ndo, " v%s", z.version+4)); 200 return; 201 } 202 203 ND_PRINT((ndo, " %s", tok2str(z_types, "type %d", z.kind))); 204 if (z.kind == Z_PACKET_SERVACK) { 205 /* Initialization to silence warnings */ 206 const char *ackdata = NULL; 207 PARSE_FIELD_STR(ackdata); 208 if (!lose && strcmp(ackdata, "SENT")) 209 ND_PRINT((ndo, "/%s", str_to_lower(ackdata))); 210 } 211 if (*z.sender) ND_PRINT((ndo, " %s", z.sender)); 212 213 if (!strcmp(z.class, "USER_LOCATE")) { 214 if (!strcmp(z.opcode, "USER_HIDE")) 215 ND_PRINT((ndo, " hide")); 216 else if (!strcmp(z.opcode, "USER_UNHIDE")) 217 ND_PRINT((ndo, " unhide")); 218 else 219 ND_PRINT((ndo, " locate %s", z.inst)); 220 return; 221 } 222 223 if (!strcmp(z.class, "ZEPHYR_ADMIN")) { 224 ND_PRINT((ndo, " zephyr-admin %s", str_to_lower(z.opcode))); 225 return; 226 } 227 228 if (!strcmp(z.class, "ZEPHYR_CTL")) { 229 if (!strcmp(z.inst, "CLIENT")) { 230 if (!strcmp(z.opcode, "SUBSCRIBE") || 231 !strcmp(z.opcode, "SUBSCRIBE_NODEFS") || 232 !strcmp(z.opcode, "UNSUBSCRIBE")) { 233 234 ND_PRINT((ndo, " %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "", 235 strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" : 236 "-nodefs")); 237 if (z.kind != Z_PACKET_SERVACK) { 238 /* Initialization to silence warnings */ 239 const char *c = NULL, *i = NULL, *r = NULL; 240 PARSE_FIELD_STR(c); 241 PARSE_FIELD_STR(i); 242 PARSE_FIELD_STR(r); 243 if (!lose) ND_PRINT((ndo, " %s", z_triple(c, i, r))); 244 } 245 return; 246 } 247 248 if (!strcmp(z.opcode, "GIMME")) { 249 ND_PRINT((ndo, " ret")); 250 return; 251 } 252 253 if (!strcmp(z.opcode, "GIMMEDEFS")) { 254 ND_PRINT((ndo, " gimme-defs")); 255 return; 256 } 257 258 if (!strcmp(z.opcode, "CLEARSUB")) { 259 ND_PRINT((ndo, " clear-subs")); 260 return; 261 } 262 263 ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); 264 return; 265 } 266 267 if (!strcmp(z.inst, "HM")) { 268 ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); 269 return; 270 } 271 272 if (!strcmp(z.inst, "REALM")) { 273 if (!strcmp(z.opcode, "ADD_SUBSCRIBE")) 274 ND_PRINT((ndo, " realm add-subs")); 275 if (!strcmp(z.opcode, "REQ_SUBSCRIBE")) 276 ND_PRINT((ndo, " realm req-subs")); 277 if (!strcmp(z.opcode, "RLM_SUBSCRIBE")) 278 ND_PRINT((ndo, " realm rlm-sub")); 279 if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE")) 280 ND_PRINT((ndo, " realm rlm-unsub")); 281 return; 282 } 283 } 284 285 if (!strcmp(z.class, "HM_CTL")) { 286 ND_PRINT((ndo, " hm_ctl %s", str_to_lower(z.inst))); 287 ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); 288 return; 289 } 290 291 if (!strcmp(z.class, "HM_STAT")) { 292 if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) { 293 ND_PRINT((ndo, " get-client-stats")); 294 return; 295 } 296 } 297 298 if (!strcmp(z.class, "WG_CTL")) { 299 ND_PRINT((ndo, " wg_ctl %s", str_to_lower(z.inst))); 300 ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); 301 return; 302 } 303 304 if (!strcmp(z.class, "LOGIN")) { 305 if (!strcmp(z.opcode, "USER_FLUSH")) { 306 ND_PRINT((ndo, " flush_locs")); 307 return; 308 } 309 310 if (!strcmp(z.opcode, "NONE") || 311 !strcmp(z.opcode, "OPSTAFF") || 312 !strcmp(z.opcode, "REALM-VISIBLE") || 313 !strcmp(z.opcode, "REALM-ANNOUNCED") || 314 !strcmp(z.opcode, "NET-VISIBLE") || 315 !strcmp(z.opcode, "NET-ANNOUNCED")) { 316 ND_PRINT((ndo, " set-exposure %s", str_to_lower(z.opcode))); 317 return; 318 } 319 } 320 321 if (!*z.recipient) 322 z.recipient = "*"; 323 324 ND_PRINT((ndo, " to %s", z_triple(z.class, z.inst, z.recipient))); 325 if (*z.opcode) 326 ND_PRINT((ndo, " op %s", z.opcode)); 327 } 328