xref: /openbsd/usr.sbin/tcpdump/print-pfsync.c (revision 73471bf0) 
1 /*	$OpenBSD: print-pfsync.c,v 1.44 2021/12/01 18:28:46 deraadt Exp $	*/
2 
3 /*
4  * Copyright (c) 2002 Michael Shalayeff
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26  * THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/time.h>
30 #include <sys/socket.h>
31 #include <sys/file.h>
32 #include <sys/ioctl.h>
33 
34 #include <net/if.h>
35 
36 #include <netinet/in.h>
37 #include <netinet/ip.h>
38 #include <netinet/ip_ipsp.h>
39 
40 #include <net/pfvar.h>
41 #include <net/if_pfsync.h>
42 
43 #include <ctype.h>
44 #include <netdb.h>
45 #include <pcap.h>
46 #include <signal.h>
47 #include <stdio.h>
48 #include <string.h>
49 #include <vis.h>
50 
51 #include "interface.h"
52 #include "addrtoname.h"
53 #include "pfctl_parser.h"
54 #include "pfctl.h"
55 
56 void	pfsync_print(struct pfsync_header *, const u_char *, int);
57 
58 void
59 pfsync_if_print(u_char *user, const struct pcap_pkthdr *h,
60      const u_char *p)
61 {
62 	u_int caplen = h->caplen;
63 
64 	ts_print(&h->ts);
65 
66 	if (caplen < PFSYNC_HDRLEN) {
67 		printf("[|pfsync]");
68 		goto out;
69 	}
70 
71 	pfsync_print((struct pfsync_header *)p,
72 	    p + sizeof(struct pfsync_header),
73 	    caplen - sizeof(struct pfsync_header));
74 out:
75 	if (xflag) {
76 		default_print((const u_char *)p, caplen);
77 	}
78 	putchar('\n');
79 }
80 
81 void
82 pfsync_ip_print(const u_char *bp, u_int len, const u_char *bp2)
83 {
84 	struct pfsync_header *hdr = (struct pfsync_header *)bp;
85 	struct ip *ip = (struct ip *)bp2;
86 
87 	if (vflag)
88 		printf("%s > %s: ", ipaddr_string(&ip->ip_src),
89 		    ipaddr_string(&ip->ip_dst));
90 	else
91 		printf("%s: ", ipaddr_string(&ip->ip_src));
92 
93 	if (len < PFSYNC_HDRLEN)
94 		printf("[|pfsync]");
95 	else
96 		pfsync_print(hdr, bp + sizeof(struct pfsync_header),
97 		    len - sizeof(struct pfsync_header));
98 	putchar('\n');
99 }
100 
101 const char *actnames[] = { PFSYNC_ACTIONS };
102 
103 struct pfsync_actions {
104 	size_t len;
105 	int (*print)(int, const void *);
106 };
107 
108 int	pfsync_print_clr(int, const void *);
109 int	pfsync_print_state(int, const void *);
110 int	pfsync_print_ins_ack(int, const void *);
111 int	pfsync_print_upd_c(int, const void *);
112 int	pfsync_print_upd_req(int, const void *);
113 int	pfsync_print_del_c(int, const void *);
114 int	pfsync_print_bus(int, const void *);
115 int	pfsync_print_tdb(int, const void *);
116 int	pfsync_print_eof(int, const void *);
117 
118 struct pfsync_actions actions[] = {
119 	{ sizeof(struct pfsync_clr),		pfsync_print_clr },
120 	{ 0,					NULL },
121 	{ sizeof(struct pfsync_ins_ack),	pfsync_print_ins_ack },
122 	{ 0,					NULL },
123 	{ sizeof(struct pfsync_upd_c),		pfsync_print_upd_c },
124 	{ sizeof(struct pfsync_upd_req),	pfsync_print_upd_req },
125 	{ sizeof(struct pfsync_state),		pfsync_print_state },
126 	{ sizeof(struct pfsync_del_c),		pfsync_print_del_c },
127 	{ 0,					NULL },
128 	{ 0,					NULL },
129 	{ sizeof(struct pfsync_bus),		pfsync_print_bus },
130 	{ 0,					NULL },
131 	{ 0,					pfsync_print_eof },
132 	{ sizeof(struct pfsync_state),		pfsync_print_state },
133 	{ sizeof(struct pfsync_state),		pfsync_print_state },
134 	{ sizeof(struct pfsync_tdb),		pfsync_print_tdb },
135 };
136 
137 void
138 pfsync_print(struct pfsync_header *hdr, const u_char *bp, int len)
139 {
140 	struct pfsync_subheader *subh;
141 	int count, plen, alen, flags = 0;
142 	int i;
143 
144 	plen = ntohs(hdr->len);
145 
146 	printf("PFSYNCv%d len %d", hdr->version, plen);
147 
148 	if (hdr->version != PFSYNC_VERSION)
149 		return;
150 
151 	plen -= sizeof(*hdr);
152 
153 	if (vflag)
154 		flags |= PF_OPT_VERBOSE;
155 	if (vflag > 1)
156 		flags |= PF_OPT_VERBOSE2;
157 	if (!nflag)
158 		flags |= PF_OPT_USEDNS;
159 
160 	while (plen > 0) {
161 		if (len < sizeof(*subh))
162 			break;
163 
164 		subh = (struct pfsync_subheader *)bp;
165 		bp += sizeof(*subh);
166 		len -= sizeof(*subh);
167 		plen -= sizeof(*subh);
168 
169 		if (subh->action >= PFSYNC_ACT_MAX) {
170 			printf("\n    act UNKNOWN id %d", subh->action);
171 			return;
172 		}
173 
174 		count = ntohs(subh->count);
175 		printf("\n    act %s count %d", actnames[subh->action], count);
176 		alen = actions[subh->action].len;
177 
178 		if (actions[subh->action].print == NULL) {
179 			printf("\n    unimplemented action");
180 			return;
181 		}
182 
183 		for (i = 0; i < count; i++) {
184 			if (len < alen) {
185 				len = 0;
186 				break;
187 			}
188 
189 			if (actions[subh->action].print(flags, bp) != 0)
190 				return;
191 
192 			bp += alen;
193 			len -= alen;
194 			plen -= alen;
195 		}
196 	}
197 
198 	if (plen > 0) {
199 		printf("\n    ...");
200 		return;
201 	}
202 	if (plen < 0) {
203 		printf("\n    invalid header length");
204 		return;
205 	}
206 	if (len > 0)
207 		printf("\n    invalid packet length");
208 }
209 
210 int
211 pfsync_print_clr(int flags, const void *bp)
212 {
213 	const struct pfsync_clr *clr = bp;
214 	char ifname[IFNAMSIZ * 4 + 1];
215 	char *cp = ifname;
216 	int i;
217 
218 	printf("\n\tcreatorid: %08x", htonl(clr->creatorid));
219 	if (clr->ifname[0] != '\0') {
220 		/* Treat clr->ifname as untrusted input. */
221 		for (i = 0; i < IFNAMSIZ && clr->ifname[i] != '\0'; i++)
222 			cp = vis(cp, clr->ifname[i], VIS_WHITE, 0);
223 		printf(" interface: %s", ifname);
224 	}
225 
226 	return (0);
227 }
228 
229 int
230 pfsync_print_state(int flags, const void *bp)
231 {
232 	struct pfsync_state *st = (struct pfsync_state *)bp;
233 	putchar('\n');
234 	print_state(st, flags);
235 	return (0);
236 }
237 
238 int
239 pfsync_print_ins_ack(int flags, const void *bp)
240 {
241 	const struct pfsync_ins_ack *iack = bp;
242 
243 	printf("\n\tid: %016llx creatorid: %08x", betoh64(iack->id),
244 	    ntohl(iack->creatorid));
245 
246 	return (0);
247 }
248 
249 int
250 pfsync_print_upd_c(int flags, const void *bp)
251 {
252 	const struct pfsync_upd_c *u = bp;
253 
254 	printf("\n\tid: %016llx creatorid: %08x", betoh64(u->id),
255 	    ntohl(u->creatorid));
256 
257 	return (0);
258 }
259 
260 int
261 pfsync_print_upd_req(int flags, const void *bp)
262 {
263 	const struct pfsync_upd_req *ur = bp;
264 
265 	printf("\n\tid: %016llx creatorid: %08x", betoh64(ur->id),
266 	    ntohl(ur->creatorid));
267 
268 	return (0);
269 }
270 
271 int
272 pfsync_print_del_c(int flags, const void *bp)
273 {
274 	const struct pfsync_del_c *d = bp;
275 
276 	printf("\n\tid: %016llx creatorid: %08x", betoh64(d->id),
277 	    ntohl(d->creatorid));
278 
279 	return (0);
280 }
281 
282 int
283 pfsync_print_bus(int flags, const void *bp)
284 {
285 	const struct pfsync_bus *b = bp;
286 	u_int32_t endtime;
287 	int min, sec;
288 	const char *status;
289 
290 	endtime = ntohl(b->endtime);
291 	sec = endtime % 60;
292 	endtime /= 60;
293 	min = endtime % 60;
294 	endtime /= 60;
295 
296 	switch (b->status) {
297 	case PFSYNC_BUS_START:
298 		status = "start";
299 		break;
300 	case PFSYNC_BUS_END:
301 		status = "end";
302 		break;
303 	default:
304 		status = "UNKNOWN";
305 		break;
306 	}
307 
308 	printf("\n\tcreatorid: %08x age: %.2u:%.2u:%.2u status: %s",
309 	    htonl(b->creatorid), endtime, min, sec, status);
310 
311 	return (0);
312 }
313 
314 int
315 pfsync_print_tdb(int flags, const void *bp)
316 {
317 	const struct pfsync_tdb *t = bp;
318 
319 	printf("\n\tspi: 0x%08x rpl: %llu cur_bytes: %llu",
320 	    ntohl(t->spi), betoh64(t->rpl), betoh64(t->cur_bytes));
321 
322 	return (0);
323 }
324 
325 int
326 pfsync_print_eof(int flags, const void *bp)
327 {
328 	return (1);
329 }
330