2 * Decode and print Zephyr packets.
4 * https://web.mit.edu/zephyr/doc/protocol
6 * Copyright (c) 2001 Nickolai Zeldovich <kolya@MIT.EDU>
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
23 /* \summary: Zephyr printer */
29 #include "netdissect-stdinc.h"
35 #include "netdissect-ctype.h"
37 #include "netdissect.h"
53 const char *recipient;
57 const char *multi_uid;
58 /* Other fields follow here.. */
73 static const 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" },
86 static char z_buf[256];
89 parse_field(netdissect_options *ndo, const char **pptr, int *len)
95 /* Scan for the NUL terminator */
98 /* Ran out of packet data without finding it */
101 if (GET_U_1(*pptr) == '\0') {
109 /* Skip the NUL terminator */
116 z_triple(const char *class, const char *inst, const char *recipient)
120 snprintf(z_buf, sizeof(z_buf), "<%s,%s,%s>", class, inst, recipient);
121 z_buf[sizeof(z_buf)-1] = '\0';
126 str_to_lower(const char *string)
130 strncpy(z_buf, string, sizeof(z_buf));
131 z_buf[sizeof(z_buf)-1] = '\0';
135 *zb_string = ND_ASCII_TOLOWER(*zb_string);
143 zephyr_print(netdissect_options *ndo, const u_char *cp, u_int length)
145 struct z_packet z = {
158 NULL, /* recipient */
164 const char *parse = (const char *) cp;
165 int parselen = length;
169 ndo->ndo_protocol = "zephyr";
170 /* squelch compiler warnings */
172 #define PARSE_STRING \
173 s = parse_field(ndo, &parse, &parselen); \
176 #define PARSE_FIELD_INT(field) \
178 if (!lose) field = strtol(s, 0, 16);
180 #define PARSE_FIELD_STR(field) \
182 if (!lose) field = s;
184 PARSE_FIELD_STR(z.version);
188 if (strncmp(z.version, "ZEPH", 4))
191 PARSE_FIELD_INT(z.numfields);
192 PARSE_FIELD_INT(z.kind);
193 PARSE_FIELD_STR(z.uid);
194 PARSE_FIELD_INT(z.port);
195 PARSE_FIELD_INT(z.auth);
196 PARSE_FIELD_INT(z.authlen);
197 PARSE_FIELD_STR(z.authdata);
198 PARSE_FIELD_STR(z.class);
199 PARSE_FIELD_STR(z.inst);
200 PARSE_FIELD_STR(z.opcode);
201 PARSE_FIELD_STR(z.sender);
202 PARSE_FIELD_STR(z.recipient);
203 PARSE_FIELD_STR(z.format);
204 PARSE_FIELD_INT(z.cksum);
205 PARSE_FIELD_INT(z.multi);
206 PARSE_FIELD_STR(z.multi_uid);
212 if (strncmp(z.version+4, "0.2", 3)) {
213 ND_PRINT(" v%s", z.version+4);
217 ND_PRINT(" %s", tok2str(z_types, "type %d", z.kind));
218 if (z.kind == Z_PACKET_SERVACK) {
219 /* Initialization to silence warnings */
220 const char *ackdata = NULL;
221 PARSE_FIELD_STR(ackdata);
222 if (!lose && strcmp(ackdata, "SENT"))
223 ND_PRINT("/%s", str_to_lower(ackdata));
225 if (*z.sender) ND_PRINT(" %s", z.sender);
227 if (!strcmp(z.class, "USER_LOCATE")) {
228 if (!strcmp(z.opcode, "USER_HIDE"))
230 else if (!strcmp(z.opcode, "USER_UNHIDE"))
233 ND_PRINT(" locate %s", z.inst);
237 if (!strcmp(z.class, "ZEPHYR_ADMIN")) {
238 ND_PRINT(" zephyr-admin %s", str_to_lower(z.opcode));
242 if (!strcmp(z.class, "ZEPHYR_CTL")) {
243 if (!strcmp(z.inst, "CLIENT")) {
244 if (!strcmp(z.opcode, "SUBSCRIBE") ||
245 !strcmp(z.opcode, "SUBSCRIBE_NODEFS") ||
246 !strcmp(z.opcode, "UNSUBSCRIBE")) {
248 ND_PRINT(" %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "",
249 strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" :
251 if (z.kind != Z_PACKET_SERVACK) {
252 /* Initialization to silence warnings */
253 const char *c = NULL, *i = NULL, *r = NULL;
257 if (!lose) ND_PRINT(" %s", z_triple(c, i, r));
262 if (!strcmp(z.opcode, "GIMME")) {
267 if (!strcmp(z.opcode, "GIMMEDEFS")) {
268 ND_PRINT(" gimme-defs");
272 if (!strcmp(z.opcode, "CLEARSUB")) {
273 ND_PRINT(" clear-subs");
277 ND_PRINT(" %s", str_to_lower(z.opcode));
281 if (!strcmp(z.inst, "HM")) {
282 ND_PRINT(" %s", str_to_lower(z.opcode));
286 if (!strcmp(z.inst, "REALM")) {
287 if (!strcmp(z.opcode, "ADD_SUBSCRIBE"))
288 ND_PRINT(" realm add-subs");
289 if (!strcmp(z.opcode, "REQ_SUBSCRIBE"))
290 ND_PRINT(" realm req-subs");
291 if (!strcmp(z.opcode, "RLM_SUBSCRIBE"))
292 ND_PRINT(" realm rlm-sub");
293 if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE"))
294 ND_PRINT(" realm rlm-unsub");
299 if (!strcmp(z.class, "HM_CTL")) {
300 ND_PRINT(" hm_ctl %s", str_to_lower(z.inst));
301 ND_PRINT(" %s", str_to_lower(z.opcode));
305 if (!strcmp(z.class, "HM_STAT")) {
306 if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) {
307 ND_PRINT(" get-client-stats");
312 if (!strcmp(z.class, "WG_CTL")) {
313 ND_PRINT(" wg_ctl %s", str_to_lower(z.inst));
314 ND_PRINT(" %s", str_to_lower(z.opcode));
318 if (!strcmp(z.class, "LOGIN")) {
319 if (!strcmp(z.opcode, "USER_FLUSH")) {
320 ND_PRINT(" flush_locs");
324 if (!strcmp(z.opcode, "NONE") ||
325 !strcmp(z.opcode, "OPSTAFF") ||
326 !strcmp(z.opcode, "REALM-VISIBLE") ||
327 !strcmp(z.opcode, "REALM-ANNOUNCED") ||
328 !strcmp(z.opcode, "NET-VISIBLE") ||
329 !strcmp(z.opcode, "NET-ANNOUNCED")) {
330 ND_PRINT(" set-exposure %s", str_to_lower(z.opcode));
338 ND_PRINT(" to %s", z_triple(z.class, z.inst, z.recipient));
340 ND_PRINT(" op %s", z.opcode);
344 nd_print_invalid(ndo);