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pcap-pf.c (127664) pcap-pf.c (146768)
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

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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

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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>

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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>

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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

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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

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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

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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

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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;

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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;

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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:

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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:

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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 */

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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 */

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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);

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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);

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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

--- 22 unchanged lines hidden --- 		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

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