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 /* \summary: Zephyr printer */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <netdissect-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34
  35 #include "netdissect.h"
  36
  37 struct z_packet {
  38     const char *version;
  39     int numfields;
  40     int kind;
  41     const char *uid;
  42     int port;
  43     int auth;
  44     int authlen;
  45     const char *authdata;
  46     const char *class;
  47     const char *inst;
  48     const char *opcode;
  49     const char *sender;
  50     const char *recipient;
  51     const char *format;
  52     int cksum;
  53     int multi;
  54     const char *multi_uid;
  55     /* Other fields follow here.. */
  56 };
  57
  58 enum z_packet_type {
  59     Z_PACKET_UNSAFE = 0,
  60     Z_PACKET_UNACKED,
  61     Z_PACKET_ACKED,
  62     Z_PACKET_HMACK,
  63     Z_PACKET_HMCTL,
  64     Z_PACKET_SERVACK,
  65     Z_PACKET_SERVNAK,
  66     Z_PACKET_CLIENTACK,
  67     Z_PACKET_STAT
  68 };
  69
  70 static const struct tok z_types[] = {
  71     { Z_PACKET_UNSAFE,          "unsafe" },
  72     { Z_PACKET_UNACKED,         "unacked" },
  73     { Z_PACKET_ACKED,           "acked" },
  74     { Z_PACKET_HMACK,           "hm-ack" },
  75     { Z_PACKET_HMCTL,           "hm-ctl" },
  76     { Z_PACKET_SERVACK,         "serv-ack" },
  77     { Z_PACKET_SERVNAK,         "serv-nak" },
  78     { Z_PACKET_CLIENTACK,       "client-ack" },
  79     { Z_PACKET_STAT,            "stat" },
  80     { 0,                        NULL }
  81 };
  82
  83 static char z_buf[256];
  84
  85 static const char *
  86 parse_field(netdissect_options *ndo, const char **pptr, int *len)
  87 {
  88     const char *s;
  89
  90     if (*len <= 0 || !pptr || !*pptr)
  91         return NULL;
  92     if (*pptr > (const char *) ndo->ndo_snapend)
  93         return NULL;
  94
  95     s = *pptr;
  96     while (*pptr <= (const char *) ndo->ndo_snapend && *len >= 0 && **pptr) {
  97         (*pptr)++;
  98         (*len)--;
  99     }
 100     (*pptr)++;
 101     (*len)--;
 102     if (*len < 0 || *pptr > (const char *) ndo->ndo_snapend)
 103         return NULL;
 104     return s;
 105 }
 106
 107 static const char *
 108 z_triple(const char *class, const char *inst, const char *recipient)
 109 {
 110     if (!*recipient)
 111         recipient = "*";
 112     snprintf(z_buf, sizeof(z_buf), "<%s,%s,%s>", class, inst, recipient);
 113     z_buf[sizeof(z_buf)-1] = '\0';
 114     return z_buf;
 115 }
 116
 117 static const char *
 118 str_to_lower(const char *string)
 119 {
 120     char *zb_string;
 121
 122     strncpy(z_buf, string, sizeof(z_buf));
 123     z_buf[sizeof(z_buf)-1] = '\0';
 124
 125     zb_string = z_buf;
 126     while (*zb_string) {
 127         *zb_string = tolower((unsigned char)(*zb_string));
 128         zb_string++;
 129     }
 130
 131     return z_buf;
 132 }
 133
 134 void
 135 zephyr_print(netdissect_options *ndo, const u_char *cp, int length)
 136 {
 137     struct z_packet z;
 138     const char *parse = (const char *) cp;
 139     int parselen = length;
 140     const 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(ndo, &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         ND_PRINT((ndo, " [|zephyr] (%d)", length));
 188         return;
 189     }
 190
 191     ND_PRINT((ndo, " zephyr"));
 192     if (strncmp(z.version+4, "0.2", 3)) {
 193         ND_PRINT((ndo, " v%s", z.version+4));
 194         return;
 195     }
 196
 197     ND_PRINT((ndo, " %s", tok2str(z_types, "type %d", z.kind)));
 198     if (z.kind == Z_PACKET_SERVACK) {
 199         /* Initialization to silence warnings */
 200         const char *ackdata = NULL;
 201         PARSE_FIELD_STR(ackdata);
 202         if (!lose && strcmp(ackdata, "SENT"))
 203             ND_PRINT((ndo, "/%s", str_to_lower(ackdata)));
 204     }
 205     if (*z.sender) ND_PRINT((ndo, " %s", z.sender));
 206
 207     if (!strcmp(z.class, "USER_LOCATE")) {
 208         if (!strcmp(z.opcode, "USER_HIDE"))
 209             ND_PRINT((ndo, " hide"));
 210         else if (!strcmp(z.opcode, "USER_UNHIDE"))
 211             ND_PRINT((ndo, " unhide"));
 212         else
 213             ND_PRINT((ndo, " locate %s", z.inst));
 214         return;
 215     }
 216
 217     if (!strcmp(z.class, "ZEPHYR_ADMIN")) {
 218         ND_PRINT((ndo, " 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                 ND_PRINT((ndo, " %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                     const 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) ND_PRINT((ndo, " %s", z_triple(c, i, r)));
 238                 }
 239                 return;
 240             }
 241
 242             if (!strcmp(z.opcode, "GIMME")) {
 243                 ND_PRINT((ndo, " ret"));
 244                 return;
 245             }
 246
 247             if (!strcmp(z.opcode, "GIMMEDEFS")) {
 248                 ND_PRINT((ndo, " gimme-defs"));
 249                 return;
 250             }
 251
 252             if (!strcmp(z.opcode, "CLEARSUB")) {
 253                 ND_PRINT((ndo, " clear-subs"));
 254                 return;
 255             }
 256
 257             ND_PRINT((ndo, " %s", str_to_lower(z.opcode)));
 258             return;
 259         }
 260
 261         if (!strcmp(z.inst, "HM")) {
 262             ND_PRINT((ndo, " %s", str_to_lower(z.opcode)));
 263             return;
 264         }
 265
 266         if (!strcmp(z.inst, "REALM")) {
 267             if (!strcmp(z.opcode, "ADD_SUBSCRIBE"))
 268                 ND_PRINT((ndo, " realm add-subs"));
 269             if (!strcmp(z.opcode, "REQ_SUBSCRIBE"))
 270                 ND_PRINT((ndo, " realm req-subs"));
 271             if (!strcmp(z.opcode, "RLM_SUBSCRIBE"))
 272                 ND_PRINT((ndo, " realm rlm-sub"));
 273             if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE"))
 274                 ND_PRINT((ndo, " realm rlm-unsub"));
 275             return;
 276         }
 277     }
 278
 279     if (!strcmp(z.class, "HM_CTL")) {
 280         ND_PRINT((ndo, " hm_ctl %s", str_to_lower(z.inst)));
 281         ND_PRINT((ndo, " %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             ND_PRINT((ndo, " get-client-stats"));
 288             return;
 289         }
 290     }
 291
 292     if (!strcmp(z.class, "WG_CTL")) {
 293         ND_PRINT((ndo, " wg_ctl %s", str_to_lower(z.inst)));
 294         ND_PRINT((ndo, " %s", str_to_lower(z.opcode)));
 295         return;
 296     }
 297
 298     if (!strcmp(z.class, "LOGIN")) {
 299         if (!strcmp(z.opcode, "USER_FLUSH")) {
 300             ND_PRINT((ndo, " 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             ND_PRINT((ndo, " set-exposure %s", str_to_lower(z.opcode)));
 311             return;
 312         }
 313     }
 314
 315     if (!*z.recipient)
 316         z.recipient = "*";
 317
 318     ND_PRINT((ndo, " to %s", z_triple(z.class, z.inst, z.recipient)));
 319     if (*z.opcode)
 320         ND_PRINT((ndo, " op %s", z.opcode));
 321 }