The Tcpdump Group git mirrors - tcpdump/blob - print-zephyr.c

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