1/*
2 * Copyright (c) 1990, 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, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * packet filter subroutines for tcpdump
22 * Extraction/creation by Jeffrey Mogul, DECWRL
23 */
24
25#ifndef lint
26static const char rcsid[] _U_ =
| 1/*
2 * Copyright (c) 1990, 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, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * packet filter subroutines for tcpdump
22 * Extraction/creation by Jeffrey Mogul, DECWRL
23 */
24
25#ifndef lint
26static const char rcsid[] _U_ =
|
27 "@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.79.2.5 2003/11/22 00:32:55 guy Exp $ (LBL)";
| 27 "@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.91 2005/02/26 21:58:06 guy Exp $ (LBL)";
|
28#endif
29
30#ifdef HAVE_CONFIG_H
31#include "config.h"
32#endif
33
34#include <sys/types.h>
35#include <sys/time.h>
36#include <sys/timeb.h>
37#include <sys/socket.h>
38#include <sys/file.h>
39#include <sys/ioctl.h>
40#include <net/pfilt.h>
41
42struct mbuf;
43struct rtentry;
44#include <net/if.h>
45
46#include <netinet/in.h>
47#include <netinet/in_systm.h>
48#include <netinet/ip.h>
49#include <netinet/if_ether.h>
50#include <netinet/ip_var.h>
51#include <netinet/udp.h>
52#include <netinet/udp_var.h>
53#include <netinet/tcp.h>
54#include <netinet/tcpip.h>
55
56#include <ctype.h>
57#include <errno.h>
58#include <netdb.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64/*
65 * Make "pcap.h" not include "pcap-bpf.h"; we are going to include the
66 * native OS version, as we need various BPF ioctls from it.
67 */
68#define PCAP_DONT_INCLUDE_PCAP_BPF_H
69#include <net/bpf.h>
70
71#include "pcap-int.h"
72
73#ifdef HAVE_OS_PROTO_H
74#include "os-proto.h"
75#endif
76
77static int pcap_setfilter_pf(pcap_t *, struct bpf_program *);
78
79/*
80 * BUFSPACE is the size in bytes of the packet read buffer. Most tcpdump
81 * applications aren't going to need more than 200 bytes of packet header
82 * and the read shouldn't return more packets than packetfilter's internal
83 * queue limit (bounded at 256).
84 */
85#define BUFSPACE (200 * 256)
86
87static int
88pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
89{
90 register u_char *p, *bp;
91 struct bpf_insn *fcode;
92 register int cc, n, buflen, inc;
93 register struct enstamp *sp;
94#ifdef LBL_ALIGN
95 struct enstamp stamp;
96#endif
97#ifdef PCAP_FDDIPAD
98 register int pad;
99#endif
100
101 fcode = pc->md.use_bpf ? NULL : pc->fcode.bf_insns;
102 again:
103 cc = pc->cc;
104 if (cc == 0) {
105 cc = read(pc->fd, (char *)pc->buffer + pc->offset, pc->bufsize);
106 if (cc < 0) {
107 if (errno == EWOULDBLOCK)
108 return (0);
109 if (errno == EINVAL &&
110 lseek(pc->fd, 0L, SEEK_CUR) + pc->bufsize < 0) {
111 /*
112 * Due to a kernel bug, after 2^31 bytes,
113 * the kernel file offset overflows and
114 * read fails with EINVAL. The lseek()
115 * to 0 will fix things.
116 */
117 (void)lseek(pc->fd, 0L, SEEK_SET);
118 goto again;
119 }
120 snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
121 pcap_strerror(errno));
122 return (-1);
123 }
124 bp = pc->buffer + pc->offset;
125 } else
126 bp = pc->bp;
127 /*
128 * Loop through each packet.
129 */
130 n = 0;
131#ifdef PCAP_FDDIPAD
| 28#endif
29
30#ifdef HAVE_CONFIG_H
31#include "config.h"
32#endif
33
34#include <sys/types.h>
35#include <sys/time.h>
36#include <sys/timeb.h>
37#include <sys/socket.h>
38#include <sys/file.h>
39#include <sys/ioctl.h>
40#include <net/pfilt.h>
41
42struct mbuf;
43struct rtentry;
44#include <net/if.h>
45
46#include <netinet/in.h>
47#include <netinet/in_systm.h>
48#include <netinet/ip.h>
49#include <netinet/if_ether.h>
50#include <netinet/ip_var.h>
51#include <netinet/udp.h>
52#include <netinet/udp_var.h>
53#include <netinet/tcp.h>
54#include <netinet/tcpip.h>
55
56#include <ctype.h>
57#include <errno.h>
58#include <netdb.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64/*
65 * Make "pcap.h" not include "pcap-bpf.h"; we are going to include the
66 * native OS version, as we need various BPF ioctls from it.
67 */
68#define PCAP_DONT_INCLUDE_PCAP_BPF_H
69#include <net/bpf.h>
70
71#include "pcap-int.h"
72
73#ifdef HAVE_OS_PROTO_H
74#include "os-proto.h"
75#endif
76
77static int pcap_setfilter_pf(pcap_t *, struct bpf_program *);
78
79/*
80 * BUFSPACE is the size in bytes of the packet read buffer. Most tcpdump
81 * applications aren't going to need more than 200 bytes of packet header
82 * and the read shouldn't return more packets than packetfilter's internal
83 * queue limit (bounded at 256).
84 */
85#define BUFSPACE (200 * 256)
86
87static int
88pcap_read_pf(pcap_t *pc, int cnt, pcap_handler callback, u_char *user)
89{
90 register u_char *p, *bp;
91 struct bpf_insn *fcode;
92 register int cc, n, buflen, inc;
93 register struct enstamp *sp;
94#ifdef LBL_ALIGN
95 struct enstamp stamp;
96#endif
97#ifdef PCAP_FDDIPAD
98 register int pad;
99#endif
100
101 fcode = pc->md.use_bpf ? NULL : pc->fcode.bf_insns;
102 again:
103 cc = pc->cc;
104 if (cc == 0) {
105 cc = read(pc->fd, (char *)pc->buffer + pc->offset, pc->bufsize);
106 if (cc < 0) {
107 if (errno == EWOULDBLOCK)
108 return (0);
109 if (errno == EINVAL &&
110 lseek(pc->fd, 0L, SEEK_CUR) + pc->bufsize < 0) {
111 /*
112 * Due to a kernel bug, after 2^31 bytes,
113 * the kernel file offset overflows and
114 * read fails with EINVAL. The lseek()
115 * to 0 will fix things.
116 */
117 (void)lseek(pc->fd, 0L, SEEK_SET);
118 goto again;
119 }
120 snprintf(pc->errbuf, sizeof(pc->errbuf), "pf read: %s",
121 pcap_strerror(errno));
122 return (-1);
123 }
124 bp = pc->buffer + pc->offset;
125 } else
126 bp = pc->bp;
127 /*
128 * Loop through each packet.
129 */
130 n = 0;
131#ifdef PCAP_FDDIPAD
|
132 if (pc->linktype == DLT_FDDI)
133 pad = pcap_fddipad;
134 else
135 pad = 0;
| 132 pad = p->fddipad;
|
136#endif
137 while (cc > 0) {
138 /*
139 * Has "pcap_breakloop()" been called?
140 * If so, return immediately - if we haven't read any
141 * packets, clear the flag and return -2 to indicate
142 * that we were told to break out of the loop, otherwise
143 * leave the flag set, so that the *next* call will break
144 * out of the loop without having read any packets, and
145 * return the number of packets we've processed so far.
146 */
147 if (pc->break_loop) {
148 if (n == 0) {
149 pc->break_loop = 0;
150 return (-2);
151 } else {
152 pc->cc = cc;
153 pc->bp = bp;
154 return (n);
155 }
156 }
157 if (cc < sizeof(*sp)) {
158 snprintf(pc->errbuf, sizeof(pc->errbuf),
159 "pf short read (%d)", cc);
160 return (-1);
161 }
162#ifdef LBL_ALIGN
163 if ((long)bp & 3) {
164 sp = &stamp;
165 memcpy((char *)sp, (char *)bp, sizeof(*sp));
166 } else
167#endif
168 sp = (struct enstamp *)bp;
169 if (sp->ens_stamplen != sizeof(*sp)) {
170 snprintf(pc->errbuf, sizeof(pc->errbuf),
171 "pf short stamplen (%d)",
172 sp->ens_stamplen);
173 return (-1);
174 }
175
176 p = bp + sp->ens_stamplen;
177 buflen = sp->ens_count;
178 if (buflen > pc->snapshot)
179 buflen = pc->snapshot;
180
181 /* Calculate inc before possible pad update */
182 inc = ENALIGN(buflen + sp->ens_stamplen);
183 cc -= inc;
184 bp += inc;
| 133#endif
134 while (cc > 0) {
135 /*
136 * Has "pcap_breakloop()" been called?
137 * If so, return immediately - if we haven't read any
138 * packets, clear the flag and return -2 to indicate
139 * that we were told to break out of the loop, otherwise
140 * leave the flag set, so that the *next* call will break
141 * out of the loop without having read any packets, and
142 * return the number of packets we've processed so far.
143 */
144 if (pc->break_loop) {
145 if (n == 0) {
146 pc->break_loop = 0;
147 return (-2);
148 } else {
149 pc->cc = cc;
150 pc->bp = bp;
151 return (n);
152 }
153 }
154 if (cc < sizeof(*sp)) {
155 snprintf(pc->errbuf, sizeof(pc->errbuf),
156 "pf short read (%d)", cc);
157 return (-1);
158 }
159#ifdef LBL_ALIGN
160 if ((long)bp & 3) {
161 sp = &stamp;
162 memcpy((char *)sp, (char *)bp, sizeof(*sp));
163 } else
164#endif
165 sp = (struct enstamp *)bp;
166 if (sp->ens_stamplen != sizeof(*sp)) {
167 snprintf(pc->errbuf, sizeof(pc->errbuf),
168 "pf short stamplen (%d)",
169 sp->ens_stamplen);
170 return (-1);
171 }
172
173 p = bp + sp->ens_stamplen;
174 buflen = sp->ens_count;
175 if (buflen > pc->snapshot)
176 buflen = pc->snapshot;
177
178 /* Calculate inc before possible pad update */
179 inc = ENALIGN(buflen + sp->ens_stamplen);
180 cc -= inc;
181 bp += inc;
|
185#ifdef PCAP_FDDIPAD
186 p += pad;
187 buflen -= pad;
188#endif
| |
189 pc->md.TotPkts++;
190 pc->md.TotDrops += sp->ens_dropped;
191 pc->md.TotMissed = sp->ens_ifoverflows;
192 if (pc->md.OrigMissed < 0)
193 pc->md.OrigMissed = pc->md.TotMissed;
194
195 /*
196 * Short-circuit evaluation: if using BPF filter
197 * in kernel, no need to do it now.
| 182 pc->md.TotPkts++;
183 pc->md.TotDrops += sp->ens_dropped;
184 pc->md.TotMissed = sp->ens_ifoverflows;
185 if (pc->md.OrigMissed < 0)
186 pc->md.OrigMissed = pc->md.TotMissed;
187
188 /*
189 * Short-circuit evaluation: if using BPF filter
190 * in kernel, no need to do it now.
|
| 191 *
192#ifdef PCAP_FDDIPAD
193 * Note: the filter code was generated assuming
194 * that p->fddipad was the amount of padding
195 * before the header, as that's what's required
196 * in the kernel, so we run the filter before
197 * skipping that padding.
198#endif
|
198 */
199 if (fcode == NULL ||
200 bpf_filter(fcode, p, sp->ens_count, buflen)) {
201 struct pcap_pkthdr h;
202 pc->md.TotAccepted++;
203 h.ts = sp->ens_tstamp;
204#ifdef PCAP_FDDIPAD
205 h.len = sp->ens_count - pad;
206#else
207 h.len = sp->ens_count;
208#endif
| 199 */
200 if (fcode == NULL ||
201 bpf_filter(fcode, p, sp->ens_count, buflen)) {
202 struct pcap_pkthdr h;
203 pc->md.TotAccepted++;
204 h.ts = sp->ens_tstamp;
205#ifdef PCAP_FDDIPAD
206 h.len = sp->ens_count - pad;
207#else
208 h.len = sp->ens_count;
209#endif
|
| 210#ifdef PCAP_FDDIPAD
211 p += pad;
212 buflen -= pad;
213#endif
|
209 h.caplen = buflen;
210 (*callback)(user, &h, p);
211 if (++n >= cnt && cnt > 0) {
212 pc->cc = cc;
213 pc->bp = bp;
214 return (n);
215 }
216 }
217 }
218 pc->cc = 0;
219 return (n);
220}
221
222static int
| 214 h.caplen = buflen;
215 (*callback)(user, &h, p);
216 if (++n >= cnt && cnt > 0) {
217 pc->cc = cc;
218 pc->bp = bp;
219 return (n);
220 }
221 }
222 }
223 pc->cc = 0;
224 return (n);
225}
226
227static int
|
| 228pcap_inject_pf(pcap_t *p, const void *buf, size_t size)
229{
230 int ret;
231
232 ret = write(p->fd, buf, size);
233 if (ret == -1) {
234 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
235 pcap_strerror(errno));
236 return (-1);
237 }
238 return (ret);
239}
240
241static int
|
223pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
224{
225
226 /*
227 * If packet filtering is being done in the kernel:
228 *
229 * "ps_recv" counts only packets that passed the filter.
230 * This does not include packets dropped because we
231 * ran out of buffer space. (XXX - perhaps it should,
232 * by adding "ps_drop" to "ps_recv", for compatibility
233 * with some other platforms. On the other hand, on
234 * some platforms "ps_recv" counts only packets that
235 * passed the filter, and on others it counts packets
236 * that didn't pass the filter....)
237 *
238 * "ps_drop" counts packets that passed the kernel filter
239 * (if any) but were dropped because the input queue was
240 * full.
241 *
242 * "ps_ifdrop" counts packets dropped by the network
243 * inteface (regardless of whether they would have passed
244 * the input filter, of course).
245 *
246 * If packet filtering is not being done in the kernel:
247 *
248 * "ps_recv" counts only packets that passed the filter.
249 *
250 * "ps_drop" counts packets that were dropped because the
251 * input queue was full, regardless of whether they passed
252 * the userland filter.
253 *
254 * "ps_ifdrop" counts packets dropped by the network
255 * inteface (regardless of whether they would have passed
256 * the input filter, of course).
257 *
258 * These statistics don't include packets not yet read from
259 * the kernel by libpcap, but they may include packets not
260 * yet read from libpcap by the application.
261 */
262 ps->ps_recv = p->md.TotAccepted;
263 ps->ps_drop = p->md.TotDrops;
264 ps->ps_ifdrop = p->md.TotMissed - p->md.OrigMissed;
265 return (0);
266}
267
| 242pcap_stats_pf(pcap_t *p, struct pcap_stat *ps)
243{
244
245 /*
246 * If packet filtering is being done in the kernel:
247 *
248 * "ps_recv" counts only packets that passed the filter.
249 * This does not include packets dropped because we
250 * ran out of buffer space. (XXX - perhaps it should,
251 * by adding "ps_drop" to "ps_recv", for compatibility
252 * with some other platforms. On the other hand, on
253 * some platforms "ps_recv" counts only packets that
254 * passed the filter, and on others it counts packets
255 * that didn't pass the filter....)
256 *
257 * "ps_drop" counts packets that passed the kernel filter
258 * (if any) but were dropped because the input queue was
259 * full.
260 *
261 * "ps_ifdrop" counts packets dropped by the network
262 * inteface (regardless of whether they would have passed
263 * the input filter, of course).
264 *
265 * If packet filtering is not being done in the kernel:
266 *
267 * "ps_recv" counts only packets that passed the filter.
268 *
269 * "ps_drop" counts packets that were dropped because the
270 * input queue was full, regardless of whether they passed
271 * the userland filter.
272 *
273 * "ps_ifdrop" counts packets dropped by the network
274 * inteface (regardless of whether they would have passed
275 * the input filter, of course).
276 *
277 * These statistics don't include packets not yet read from
278 * the kernel by libpcap, but they may include packets not
279 * yet read from libpcap by the application.
280 */
281 ps->ps_recv = p->md.TotAccepted;
282 ps->ps_drop = p->md.TotDrops;
283 ps->ps_ifdrop = p->md.TotMissed - p->md.OrigMissed;
284 return (0);
285}
286
|
268static void
269pcap_close_pf(pcap_t *p)
270{
271 if (p->buffer != NULL)
272 free(p->buffer);
273 if (p->fd >= 0)
274 close(p->fd);
275}
| 287/*
288 * We include the OS's <net/bpf.h>, not our "pcap-bpf.h", so we probably
289 * don't get DLT_DOCSIS defined.
290 */
291#ifndef DLT_DOCSIS
292#define DLT_DOCSIS 143
293#endif
|
276
277pcap_t *
278pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
279 char *ebuf)
280{
281 pcap_t *p;
282 short enmode;
283 int backlog = -1; /* request the most */
284 struct enfilter Filter;
285 struct endevp devparams;
286
287 p = (pcap_t *)malloc(sizeof(*p));
288 if (p == NULL) {
289 snprintf(ebuf, PCAP_ERRBUF_SIZE,
290 "pcap_open_live: %s", pcap_strerror(errno));
291 return (0);
292 }
293 memset(p, 0, sizeof(*p));
| 294
295pcap_t *
296pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
297 char *ebuf)
298{
299 pcap_t *p;
300 short enmode;
301 int backlog = -1; /* request the most */
302 struct enfilter Filter;
303 struct endevp devparams;
304
305 p = (pcap_t *)malloc(sizeof(*p));
306 if (p == NULL) {
307 snprintf(ebuf, PCAP_ERRBUF_SIZE,
308 "pcap_open_live: %s", pcap_strerror(errno));
309 return (0);
310 }
311 memset(p, 0, sizeof(*p));
|
294
| |
295 /*
| 312 /*
|
| 313 * Initially try a read/write open (to allow the inject
314 * method to work). If that fails due to permission
315 * issues, fall back to read-only. This allows a
316 * non-root user to be granted specific access to pcap
317 * capabilities via file permissions.
318 *
319 * XXX - we should have an API that has a flag that
320 * controls whether to open read-only or read-write,
321 * so that denial of permission to send (or inability
322 * to send, if sending packets isn't supported on
323 * the device in question) can be indicated at open
324 * time.
325 *
|
296 * XXX - we assume here that "pfopen()" does not, in fact, modify
297 * its argument, even though it takes a "char *" rather than a
298 * "const char *" as its first argument. That appears to be
299 * the case, at least on Digital UNIX 4.0.
300 */
| 326 * XXX - we assume here that "pfopen()" does not, in fact, modify
327 * its argument, even though it takes a "char *" rather than a
328 * "const char *" as its first argument. That appears to be
329 * the case, at least on Digital UNIX 4.0.
330 */
|
301 p->fd = pfopen(device, O_RDONLY);
| 331 p->fd = pfopen(device, O_RDWR);
332 if (p->fd == -1 && errno == EACCES)
333 p->fd = pfopen(device, O_RDONLY);
|
302 if (p->fd < 0) {
303 snprintf(ebuf, PCAP_ERRBUF_SIZE, "pf open: %s: %s\n\
304your system may not be properly configured; see the packetfilter(4) man page\n",
305 device, pcap_strerror(errno));
306 goto bad;
307 }
308 p->md.OrigMissed = -1;
309 enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
310 if (promisc)
311 enmode |= ENPROMISC;
312 if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
313 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
314 pcap_strerror(errno));
315 goto bad;
316 }
317#ifdef ENCOPYALL
318 /* Try to set COPYALL mode so that we see packets to ourself */
319 enmode = ENCOPYALL;
320 (void)ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode);/* OK if this fails */
321#endif
322 /* set the backlog */
323 if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
324 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
325 pcap_strerror(errno));
326 goto bad;
327 }
328 /* discover interface type */
329 if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
330 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
331 pcap_strerror(errno));
332 goto bad;
333 }
334 /* HACK: to compile prior to Ultrix 4.2 */
335#ifndef ENDT_FDDI
336#define ENDT_FDDI 4
337#endif
338 switch (devparams.end_dev_type) {
339
340 case ENDT_10MB:
341 p->linktype = DLT_EN10MB;
342 p->offset = 2;
| 334 if (p->fd < 0) {
335 snprintf(ebuf, PCAP_ERRBUF_SIZE, "pf open: %s: %s\n\
336your system may not be properly configured; see the packetfilter(4) man page\n",
337 device, pcap_strerror(errno));
338 goto bad;
339 }
340 p->md.OrigMissed = -1;
341 enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
342 if (promisc)
343 enmode |= ENPROMISC;
344 if (ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode) < 0) {
345 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCMBIS: %s",
346 pcap_strerror(errno));
347 goto bad;
348 }
349#ifdef ENCOPYALL
350 /* Try to set COPYALL mode so that we see packets to ourself */
351 enmode = ENCOPYALL;
352 (void)ioctl(p->fd, EIOCMBIS, (caddr_t)&enmode);/* OK if this fails */
353#endif
354 /* set the backlog */
355 if (ioctl(p->fd, EIOCSETW, (caddr_t)&backlog) < 0) {
356 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETW: %s",
357 pcap_strerror(errno));
358 goto bad;
359 }
360 /* discover interface type */
361 if (ioctl(p->fd, EIOCDEVP, (caddr_t)&devparams) < 0) {
362 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCDEVP: %s",
363 pcap_strerror(errno));
364 goto bad;
365 }
366 /* HACK: to compile prior to Ultrix 4.2 */
367#ifndef ENDT_FDDI
368#define ENDT_FDDI 4
369#endif
370 switch (devparams.end_dev_type) {
371
372 case ENDT_10MB:
373 p->linktype = DLT_EN10MB;
374 p->offset = 2;
|
| 375 /*
376 * This is (presumably) a real Ethernet capture; give it a
377 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
378 * that an application can let you choose it, in case you're
379 * capturing DOCSIS traffic that a Cisco Cable Modem
380 * Termination System is putting out onto an Ethernet (it
381 * doesn't put an Ethernet header onto the wire, it puts raw
382 * DOCSIS frames out on the wire inside the low-level
383 * Ethernet framing).
384 */
385 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
386 /*
387 * If that fails, just leave the list empty.
388 */
389 if (p->dlt_list != NULL) {
390 p->dlt_list[0] = DLT_EN10MB;
391 p->dlt_list[1] = DLT_DOCSIS;
392 p->dlt_count = 2;
393 }
|
343 break;
344
345 case ENDT_FDDI:
346 p->linktype = DLT_FDDI;
347 break;
348
349#ifdef ENDT_SLIP
350 case ENDT_SLIP:
351 p->linktype = DLT_SLIP;
352 break;
353#endif
354
355#ifdef ENDT_PPP
356 case ENDT_PPP:
357 p->linktype = DLT_PPP;
358 break;
359#endif
360
361#ifdef ENDT_LOOPBACK
362 case ENDT_LOOPBACK:
363 /*
364 * It appears to use Ethernet framing, at least on
365 * Digital UNIX 4.0.
366 */
367 p->linktype = DLT_EN10MB;
368 p->offset = 2;
369 break;
370#endif
371
372#ifdef ENDT_TRN
373 case ENDT_TRN:
374 p->linktype = DLT_IEEE802;
375 break;
376#endif
377
378 default:
379 /*
380 * XXX - what about ENDT_IEEE802? The pfilt.h header
381 * file calls this "IEEE 802 networks (non-Ethernet)",
382 * but that doesn't specify a specific link layer type;
383 * it could be 802.4, or 802.5 (except that 802.5 is
384 * ENDT_TRN), or 802.6, or 802.11, or.... That's why
385 * DLT_IEEE802 was hijacked to mean Token Ring in various
386 * BSDs, and why we went along with that hijacking.
387 *
388 * XXX - what about ENDT_HDLC and ENDT_NULL?
389 * Presumably, as ENDT_OTHER is just "Miscellaneous
390 * framing", there's not much we can do, as that
391 * doesn't specify a particular type of header.
392 */
393 snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown data-link type %u",
394 devparams.end_dev_type);
395 goto bad;
396 }
397 /* set truncation */
398#ifdef PCAP_FDDIPAD
| 394 break;
395
396 case ENDT_FDDI:
397 p->linktype = DLT_FDDI;
398 break;
399
400#ifdef ENDT_SLIP
401 case ENDT_SLIP:
402 p->linktype = DLT_SLIP;
403 break;
404#endif
405
406#ifdef ENDT_PPP
407 case ENDT_PPP:
408 p->linktype = DLT_PPP;
409 break;
410#endif
411
412#ifdef ENDT_LOOPBACK
413 case ENDT_LOOPBACK:
414 /*
415 * It appears to use Ethernet framing, at least on
416 * Digital UNIX 4.0.
417 */
418 p->linktype = DLT_EN10MB;
419 p->offset = 2;
420 break;
421#endif
422
423#ifdef ENDT_TRN
424 case ENDT_TRN:
425 p->linktype = DLT_IEEE802;
426 break;
427#endif
428
429 default:
430 /*
431 * XXX - what about ENDT_IEEE802? The pfilt.h header
432 * file calls this "IEEE 802 networks (non-Ethernet)",
433 * but that doesn't specify a specific link layer type;
434 * it could be 802.4, or 802.5 (except that 802.5 is
435 * ENDT_TRN), or 802.6, or 802.11, or.... That's why
436 * DLT_IEEE802 was hijacked to mean Token Ring in various
437 * BSDs, and why we went along with that hijacking.
438 *
439 * XXX - what about ENDT_HDLC and ENDT_NULL?
440 * Presumably, as ENDT_OTHER is just "Miscellaneous
441 * framing", there's not much we can do, as that
442 * doesn't specify a particular type of header.
443 */
444 snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown data-link type %u",
445 devparams.end_dev_type);
446 goto bad;
447 }
448 /* set truncation */
449#ifdef PCAP_FDDIPAD
|
399 if (p->linktype == DLT_FDDI)
| 450 if (p->linktype == DLT_FDDI) {
451 p->fddipad = PCAP_FDDIPAD:
452
|
400 /* packetfilter includes the padding in the snapshot */
| 453 /* packetfilter includes the padding in the snapshot */
|
401 snaplen += pcap_fddipad;
| 454 snaplen += PCAP_FDDIPAD;
455 } else
456 p->fddipad = 0;
|
402#endif
403 if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&snaplen) < 0) {
404 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
405 pcap_strerror(errno));
406 goto bad;
407 }
408 p->snapshot = snaplen;
409 /* accept all packets */
410 memset(&Filter, 0, sizeof(Filter));
411 Filter.enf_Priority = 37; /* anything > 2 */
412 Filter.enf_FilterLen = 0; /* means "always true" */
413 if (ioctl(p->fd, EIOCSETF, (caddr_t)&Filter) < 0) {
414 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETF: %s",
415 pcap_strerror(errno));
416 goto bad;
417 }
418
419 if (to_ms != 0) {
420 struct timeval timeout;
421 timeout.tv_sec = to_ms / 1000;
422 timeout.tv_usec = (to_ms * 1000) % 1000000;
423 if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
424 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
425 pcap_strerror(errno));
426 goto bad;
427 }
428 }
429
430 p->bufsize = BUFSPACE;
431 p->buffer = (u_char*)malloc(p->bufsize + p->offset);
432 if (p->buffer == NULL) {
433 strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
434 goto bad;
435 }
436
437 /*
438 * "select()" and "poll()" work on packetfilter devices.
439 */
440 p->selectable_fd = p->fd;
441
442 p->read_op = pcap_read_pf;
| 457#endif
458 if (ioctl(p->fd, EIOCTRUNCATE, (caddr_t)&snaplen) < 0) {
459 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCTRUNCATE: %s",
460 pcap_strerror(errno));
461 goto bad;
462 }
463 p->snapshot = snaplen;
464 /* accept all packets */
465 memset(&Filter, 0, sizeof(Filter));
466 Filter.enf_Priority = 37; /* anything > 2 */
467 Filter.enf_FilterLen = 0; /* means "always true" */
468 if (ioctl(p->fd, EIOCSETF, (caddr_t)&Filter) < 0) {
469 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSETF: %s",
470 pcap_strerror(errno));
471 goto bad;
472 }
473
474 if (to_ms != 0) {
475 struct timeval timeout;
476 timeout.tv_sec = to_ms / 1000;
477 timeout.tv_usec = (to_ms * 1000) % 1000000;
478 if (ioctl(p->fd, EIOCSRTIMEOUT, (caddr_t)&timeout) < 0) {
479 snprintf(ebuf, PCAP_ERRBUF_SIZE, "EIOCSRTIMEOUT: %s",
480 pcap_strerror(errno));
481 goto bad;
482 }
483 }
484
485 p->bufsize = BUFSPACE;
486 p->buffer = (u_char*)malloc(p->bufsize + p->offset);
487 if (p->buffer == NULL) {
488 strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
489 goto bad;
490 }
491
492 /*
493 * "select()" and "poll()" work on packetfilter devices.
494 */
495 p->selectable_fd = p->fd;
496
497 p->read_op = pcap_read_pf;
|
| 498 p->inject_op = pcap_inject_pf;
|
443 p->setfilter_op = pcap_setfilter_pf;
444 p->set_datalink_op = NULL; /* can't change data link type */
445 p->getnonblock_op = pcap_getnonblock_fd;
446 p->setnonblock_op = pcap_setnonblock_fd;
447 p->stats_op = pcap_stats_pf;
| 499 p->setfilter_op = pcap_setfilter_pf;
500 p->set_datalink_op = NULL; /* can't change data link type */
501 p->getnonblock_op = pcap_getnonblock_fd;
502 p->setnonblock_op = pcap_setnonblock_fd;
503 p->stats_op = pcap_stats_pf;
|
448 p->close_op = pcap_close_pf;
| 504 p->close_op = pcap_close_common;
|
449
450 return (p);
451 bad:
452 if (p->fd >= 0)
453 close(p->fd);
| 505
506 return (p);
507 bad:
508 if (p->fd >= 0)
509 close(p->fd);
|
| 510 /*
511 * Get rid of any link-layer type list we allocated.
512 */
513 if (p->dlt_list != NULL)
514 free(p->dlt_list);
|
454 free(p);
455 return (NULL);
456}
457
458int
459pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
460{
461 return (0);
462}
463
464static int
465pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
466{
467 struct bpf_version bv;
468
469 /*
470 * See if BIOCVERSION works. If not, we assume the kernel doesn't
471 * support BPF-style filters (it's not documented in the bpf(7)
472 * or packetfiler(7) man pages, but the code used to fail if
473 * BIOCSETF worked but BIOCVERSION didn't, and I've seen it do
474 * kernel filtering in DU 4.0, so presumably BIOCVERSION works
475 * there, at least).
476 */
477 if (ioctl(p->fd, BIOCVERSION, (caddr_t)&bv) >= 0) {
478 /*
479 * OK, we have the version of the BPF interpreter;
480 * is it the same major version as us, and the same
481 * or better minor version?
482 */
483 if (bv.bv_major == BPF_MAJOR_VERSION &&
484 bv.bv_minor >= BPF_MINOR_VERSION) {
485 /*
486 * Yes. Try to install the filter.
487 */
488 if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
489 snprintf(p->errbuf, sizeof(p->errbuf),
490 "BIOCSETF: %s", pcap_strerror(errno));
491 return (-1);
492 }
493
494 /*
495 * OK, that succeeded. We're doing filtering in
496 * the kernel. (We assume we don't have a
497 * userland filter installed - that'd require
498 * a previous version check to have failed but
499 * this one to succeed.)
500 *
501 * XXX - this message should be supplied to the
502 * application as a warning of some sort,
503 * except that if it's a GUI application, it's
504 * not clear that it should be displayed in
505 * a window to annoy the user.
506 */
507 fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
508 p->md.use_bpf = 1;
| 515 free(p);
516 return (NULL);
517}
518
519int
520pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
521{
522 return (0);
523}
524
525static int
526pcap_setfilter_pf(pcap_t *p, struct bpf_program *fp)
527{
528 struct bpf_version bv;
529
530 /*
531 * See if BIOCVERSION works. If not, we assume the kernel doesn't
532 * support BPF-style filters (it's not documented in the bpf(7)
533 * or packetfiler(7) man pages, but the code used to fail if
534 * BIOCSETF worked but BIOCVERSION didn't, and I've seen it do
535 * kernel filtering in DU 4.0, so presumably BIOCVERSION works
536 * there, at least).
537 */
538 if (ioctl(p->fd, BIOCVERSION, (caddr_t)&bv) >= 0) {
539 /*
540 * OK, we have the version of the BPF interpreter;
541 * is it the same major version as us, and the same
542 * or better minor version?
543 */
544 if (bv.bv_major == BPF_MAJOR_VERSION &&
545 bv.bv_minor >= BPF_MINOR_VERSION) {
546 /*
547 * Yes. Try to install the filter.
548 */
549 if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
550 snprintf(p->errbuf, sizeof(p->errbuf),
551 "BIOCSETF: %s", pcap_strerror(errno));
552 return (-1);
553 }
554
555 /*
556 * OK, that succeeded. We're doing filtering in
557 * the kernel. (We assume we don't have a
558 * userland filter installed - that'd require
559 * a previous version check to have failed but
560 * this one to succeed.)
561 *
562 * XXX - this message should be supplied to the
563 * application as a warning of some sort,
564 * except that if it's a GUI application, it's
565 * not clear that it should be displayed in
566 * a window to annoy the user.
567 */
568 fprintf(stderr, "tcpdump: Using kernel BPF filter\n");
569 p->md.use_bpf = 1;
|
| 570
571 /*
572 * Discard any previously-received packets,
573 * as they might have passed whatever filter
574 * was formerly in effect, but might not pass
575 * this filter (BIOCSETF discards packets buffered
576 * in the kernel, so you can lose packets in any
577 * case).
578 */
579 p->cc = 0;
|
509 return (0);
510 }
511
512 /*
513 * We can't use the kernel's BPF interpreter; don't give
514 * up, just log a message and be inefficient.
515 *
516 * XXX - this should really be supplied to the application
517 * as a warning of some sort.
518 */
519 fprintf(stderr,
520 "tcpdump: Requires BPF language %d.%d or higher; kernel is %d.%d\n",
521 BPF_MAJOR_VERSION, BPF_MINOR_VERSION,
522 bv.bv_major, bv.bv_minor);
523 }
524
525 /*
526 * We couldn't do filtering in the kernel; do it in userland.
527 */
528 if (install_bpf_program(p, fp) < 0)
529 return (-1);
530
531 /*
532 * XXX - this message should be supplied by the application as
533 * a warning of some sort.
534 */
535 fprintf(stderr, "tcpdump: Filtering in user process\n");
536 p->md.use_bpf = 0;
537 return (0);
538}
| 580 return (0);
581 }
582
583 /*
584 * We can't use the kernel's BPF interpreter; don't give
585 * up, just log a message and be inefficient.
586 *
587 * XXX - this should really be supplied to the application
588 * as a warning of some sort.
589 */
590 fprintf(stderr,
591 "tcpdump: Requires BPF language %d.%d or higher; kernel is %d.%d\n",
592 BPF_MAJOR_VERSION, BPF_MINOR_VERSION,
593 bv.bv_major, bv.bv_minor);
594 }
595
596 /*
597 * We couldn't do filtering in the kernel; do it in userland.
598 */
599 if (install_bpf_program(p, fp) < 0)
600 return (-1);
601
602 /*
603 * XXX - this message should be supplied by the application as
604 * a warning of some sort.
605 */
606 fprintf(stderr, "tcpdump: Filtering in user process\n");
607 p->md.use_bpf = 0;
608 return (0);
609}
|