print-zephyr.c revision 1.2.14.1 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 #include <sys/cdefs.h>
24 #ifndef lint
25 __RCSID("$NetBSD: print-zephyr.c,v 1.2.14.1 2017/02/19 07:35:25 snj 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