1 /*
2 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Lawrence Berkeley Laboratory,
11 * Berkeley, CA. The name of the University may not be used to
12 * endorse or promote products derived from this software without
13 * specific prior written permission.
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17 *
18 * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
19 */
20
21 #ifndef lint
22 static const char rcsid[] _U_ =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.38 2006-02-11 22:13:24 hannes Exp $ (LBL)";
24 #endif
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <tcpdump-stdinc.h>
31
32 #include <stdio.h>
33
34 #include "interface.h"
35 #include "addrtoname.h"
36 #include "extract.h"
37
38 #include "ip.h"
39
40 struct egp_packet {
41 u_int8_t egp_version;
42 #define EGP_VERSION 2
43 u_int8_t egp_type;
44 #define EGPT_ACQUIRE 3
45 #define EGPT_REACH 5
46 #define EGPT_POLL 2
47 #define EGPT_UPDATE 1
48 #define EGPT_ERROR 8
49 u_int8_t egp_code;
50 #define EGPC_REQUEST 0
51 #define EGPC_CONFIRM 1
52 #define EGPC_REFUSE 2
53 #define EGPC_CEASE 3
54 #define EGPC_CEASEACK 4
55 #define EGPC_HELLO 0
56 #define EGPC_HEARDU 1
57 u_int8_t egp_status;
58 #define EGPS_UNSPEC 0
59 #define EGPS_ACTIVE 1
60 #define EGPS_PASSIVE 2
61 #define EGPS_NORES 3
62 #define EGPS_ADMIN 4
63 #define EGPS_GODOWN 5
64 #define EGPS_PARAM 6
65 #define EGPS_PROTO 7
66 #define EGPS_INDET 0
67 #define EGPS_UP 1
68 #define EGPS_DOWN 2
69 #define EGPS_UNSOL 0x80
70 u_int16_t egp_checksum;
71 u_int16_t egp_as;
72 u_int16_t egp_sequence;
73 union {
74 u_int16_t egpu_hello;
75 u_int8_t egpu_gws[2];
76 u_int16_t egpu_reason;
77 #define EGPR_UNSPEC 0
78 #define EGPR_BADHEAD 1
79 #define EGPR_BADDATA 2
80 #define EGPR_NOREACH 3
81 #define EGPR_XSPOLL 4
82 #define EGPR_NORESP 5
83 #define EGPR_UVERSION 6
84 } egp_handg;
85 #define egp_hello egp_handg.egpu_hello
86 #define egp_intgw egp_handg.egpu_gws[0]
87 #define egp_extgw egp_handg.egpu_gws[1]
88 #define egp_reason egp_handg.egpu_reason
89 union {
90 u_int16_t egpu_poll;
91 u_int32_t egpu_sourcenet;
92 } egp_pands;
93 #define egp_poll egp_pands.egpu_poll
94 #define egp_sourcenet egp_pands.egpu_sourcenet
95 };
96
97 const char *egp_acquire_codes[] = {
98 "request",
99 "confirm",
100 "refuse",
101 "cease",
102 "cease_ack"
103 };
104
105 const char *egp_acquire_status[] = {
106 "unspecified",
107 "active_mode",
108 "passive_mode",
109 "insufficient_resources",
110 "administratively_prohibited",
111 "going_down",
112 "parameter_violation",
113 "protocol_violation"
114 };
115
116 const char *egp_reach_codes[] = {
117 "hello",
118 "i-h-u"
119 };
120
121 const char *egp_status_updown[] = {
122 "indeterminate",
123 "up",
124 "down"
125 };
126
127 const char *egp_reasons[] = {
128 "unspecified",
129 "bad_EGP_header_format",
130 "bad_EGP_data_field_format",
131 "reachability_info_unavailable",
132 "excessive_polling_rate",
133 "no_response",
134 "unsupported_version"
135 };
136
137 static void
egpnrprint(register const struct egp_packet * egp)138 egpnrprint(register const struct egp_packet *egp)
139 {
140 register const u_int8_t *cp;
141 u_int32_t addr;
142 register u_int32_t net;
143 register u_int netlen;
144 int gateways, distances, networks;
145 int t_gateways;
146 const char *comma;
147
148 addr = egp->egp_sourcenet;
149 if (IN_CLASSA(addr)) {
150 net = addr & IN_CLASSA_NET;
151 netlen = 1;
152 } else if (IN_CLASSB(addr)) {
153 net = addr & IN_CLASSB_NET;
154 netlen = 2;
155 } else if (IN_CLASSC(addr)) {
156 net = addr & IN_CLASSC_NET;
157 netlen = 3;
158 } else {
159 net = 0;
160 netlen = 0;
161 }
162 cp = (u_int8_t *)(egp + 1);
163
164 t_gateways = egp->egp_intgw + egp->egp_extgw;
165 for (gateways = 0; gateways < t_gateways; ++gateways) {
166 /* Pickup host part of gateway address */
167 addr = 0;
168 TCHECK2(cp[0], 4 - netlen);
169 switch (netlen) {
170
171 case 1:
172 addr = *cp++;
173 /* fall through */
174 case 2:
175 addr = (addr << 8) | *cp++;
176 /* fall through */
177 case 3:
178 addr = (addr << 8) | *cp++;
179 }
180 addr |= net;
181 TCHECK2(cp[0], 1);
182 distances = *cp++;
183 printf(" %s %s ",
184 gateways < (int)egp->egp_intgw ? "int" : "ext",
185 ipaddr_string(&addr));
186
187 comma = "";
188 putchar('(');
189 while (--distances >= 0) {
190 TCHECK2(cp[0], 2);
191 printf("%sd%d:", comma, (int)*cp++);
192 comma = ", ";
193 networks = *cp++;
194 while (--networks >= 0) {
195 /* Pickup network number */
196 TCHECK2(cp[0], 1);
197 addr = (u_int32_t)*cp++ << 24;
198 if (IN_CLASSB(addr)) {
199 TCHECK2(cp[0], 1);
200 addr |= (u_int32_t)*cp++ << 16;
201 } else if (!IN_CLASSA(addr)) {
202 TCHECK2(cp[0], 2);
203 addr |= (u_int32_t)*cp++ << 16;
204 addr |= (u_int32_t)*cp++ << 8;
205 }
206 printf(" %s", ipaddr_string(&addr));
207 }
208 }
209 putchar(')');
210 }
211 return;
212 trunc:
213 fputs("[|]", stdout);
214 }
215
216 void
egp_print(register const u_int8_t * bp,register u_int length)217 egp_print(register const u_int8_t *bp, register u_int length)
218 {
219 register const struct egp_packet *egp;
220 register int status;
221 register int code;
222 register int type;
223
224 egp = (struct egp_packet *)bp;
225 if (!TTEST2(*egp, length)) {
226 printf("[|egp]");
227 return;
228 }
229
230 if (!vflag) {
231 printf("EGPv%u, AS %u, seq %u, length %u",
232 egp->egp_version,
233 EXTRACT_16BITS(&egp->egp_as),
234 EXTRACT_16BITS(&egp->egp_sequence),
235 length);
236 return;
237 } else
238 printf("EGPv%u, length %u",
239 egp->egp_version,
240 length);
241
242 if (egp->egp_version != EGP_VERSION) {
243 printf("[version %d]", egp->egp_version);
244 return;
245 }
246
247 type = egp->egp_type;
248 code = egp->egp_code;
249 status = egp->egp_status;
250
251 switch (type) {
252 case EGPT_ACQUIRE:
253 printf(" acquire");
254 switch (code) {
255 case EGPC_REQUEST:
256 case EGPC_CONFIRM:
257 printf(" %s", egp_acquire_codes[code]);
258 switch (status) {
259 case EGPS_UNSPEC:
260 case EGPS_ACTIVE:
261 case EGPS_PASSIVE:
262 printf(" %s", egp_acquire_status[status]);
263 break;
264
265 default:
266 printf(" [status %d]", status);
267 break;
268 }
269 printf(" hello:%d poll:%d",
270 EXTRACT_16BITS(&egp->egp_hello),
271 EXTRACT_16BITS(&egp->egp_poll));
272 break;
273
274 case EGPC_REFUSE:
275 case EGPC_CEASE:
276 case EGPC_CEASEACK:
277 printf(" %s", egp_acquire_codes[code]);
278 switch (status ) {
279 case EGPS_UNSPEC:
280 case EGPS_NORES:
281 case EGPS_ADMIN:
282 case EGPS_GODOWN:
283 case EGPS_PARAM:
284 case EGPS_PROTO:
285 printf(" %s", egp_acquire_status[status]);
286 break;
287
288 default:
289 printf("[status %d]", status);
290 break;
291 }
292 break;
293
294 default:
295 printf("[code %d]", code);
296 break;
297 }
298 break;
299
300 case EGPT_REACH:
301 switch (code) {
302
303 case EGPC_HELLO:
304 case EGPC_HEARDU:
305 printf(" %s", egp_reach_codes[code]);
306 if (status <= EGPS_DOWN)
307 printf(" state:%s", egp_status_updown[status]);
308 else
309 printf(" [status %d]", status);
310 break;
311
312 default:
313 printf("[reach code %d]", code);
314 break;
315 }
316 break;
317
318 case EGPT_POLL:
319 printf(" poll");
320 if (egp->egp_status <= EGPS_DOWN)
321 printf(" state:%s", egp_status_updown[status]);
322 else
323 printf(" [status %d]", status);
324 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
325 break;
326
327 case EGPT_UPDATE:
328 printf(" update");
329 if (status & EGPS_UNSOL) {
330 status &= ~EGPS_UNSOL;
331 printf(" unsolicited");
332 }
333 if (status <= EGPS_DOWN)
334 printf(" state:%s", egp_status_updown[status]);
335 else
336 printf(" [status %d]", status);
337 printf(" %s int %d ext %d",
338 ipaddr_string(&egp->egp_sourcenet),
339 egp->egp_intgw,
340 egp->egp_extgw);
341 if (vflag)
342 egpnrprint(egp);
343 break;
344
345 case EGPT_ERROR:
346 printf(" error");
347 if (status <= EGPS_DOWN)
348 printf(" state:%s", egp_status_updown[status]);
349 else
350 printf(" [status %d]", status);
351
352 if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
353 printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
354 else
355 printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
356 break;
357
358 default:
359 printf("[type %d]", type);
360 break;
361 }
362 }
363