pcap.c revision 146768
1/* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 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 the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.88 2005/02/08 20:03:15 guy Exp $ (LBL)"; 37#endif 38 39#ifdef HAVE_CONFIG_H 40#include "config.h" 41#endif 42 43#ifdef WIN32 44#include <pcap-stdinc.h> 45#else /* WIN32 */ 46#include <sys/types.h> 47#endif /* WIN32 */ 48 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#if !defined(_MSC_VER) && !defined(__BORLANDC__) 53#include <unistd.h> 54#endif 55#include <fcntl.h> 56#include <errno.h> 57 58#ifdef HAVE_OS_PROTO_H 59#include "os-proto.h" 60#endif 61 62#ifdef MSDOS 63#include "pcap-dos.h" 64#endif 65 66#include "pcap-int.h" 67 68#ifdef HAVE_DAG_API 69#include <dagnew.h> 70#include <dagapi.h> 71#endif 72 73int 74pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 75{ 76 77 return p->read_op(p, cnt, callback, user); 78} 79 80/* 81 * XXX - is this necessary? 82 */ 83int 84pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 85{ 86 87 return p->read_op(p, cnt, callback, user); 88} 89 90int 91pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 92{ 93 register int n; 94 95 for (;;) { 96 if (p->sf.rfile != NULL) { 97 /* 98 * 0 means EOF, so don't loop if we get 0. 99 */ 100 n = pcap_offline_read(p, cnt, callback, user); 101 } else { 102 /* 103 * XXX keep reading until we get something 104 * (or an error occurs) 105 */ 106 do { 107 n = p->read_op(p, cnt, callback, user); 108 } while (n == 0); 109 } 110 if (n <= 0) 111 return (n); 112 if (cnt > 0) { 113 cnt -= n; 114 if (cnt <= 0) 115 return (0); 116 } 117 } 118} 119 120struct singleton { 121 struct pcap_pkthdr *hdr; 122 const u_char *pkt; 123}; 124 125 126static void 127pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt) 128{ 129 struct singleton *sp = (struct singleton *)userData; 130 *sp->hdr = *h; 131 sp->pkt = pkt; 132} 133 134const u_char * 135pcap_next(pcap_t *p, struct pcap_pkthdr *h) 136{ 137 struct singleton s; 138 139 s.hdr = h; 140 if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0) 141 return (0); 142 return (s.pkt); 143} 144 145struct pkt_for_fakecallback { 146 struct pcap_pkthdr *hdr; 147 const u_char **pkt; 148}; 149 150static void 151pcap_fakecallback(u_char *userData, const struct pcap_pkthdr *h, 152 const u_char *pkt) 153{ 154 struct pkt_for_fakecallback *sp = (struct pkt_for_fakecallback *)userData; 155 156 *sp->hdr = *h; 157 *sp->pkt = pkt; 158} 159 160int 161pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 162 const u_char **pkt_data) 163{ 164 struct pkt_for_fakecallback s; 165 166 s.hdr = &p->pcap_header; 167 s.pkt = pkt_data; 168 169 /* Saves a pointer to the packet headers */ 170 *pkt_header= &p->pcap_header; 171 172 if (p->sf.rfile != NULL) { 173 int status; 174 175 /* We are on an offline capture */ 176 status = pcap_offline_read(p, 1, pcap_fakecallback, 177 (u_char *)&s); 178 179 /* 180 * Return codes for pcap_offline_read() are: 181 * - 0: EOF 182 * - -1: error 183 * - >1: OK 184 * The first one ('0') conflicts with the return code of 185 * 0 from pcap_read() meaning "no packets arrived before 186 * the timeout expired", so we map it to -2 so you can 187 * distinguish between an EOF from a savefile and a 188 * "no packets arrived before the timeout expired, try 189 * again" from a live capture. 190 */ 191 if (status == 0) 192 return (-2); 193 else 194 return (status); 195 } 196 197 /* 198 * Return codes for pcap_read() are: 199 * - 0: timeout 200 * - -1: error 201 * - -2: loop was broken out of with pcap_breakloop() 202 * - >1: OK 203 * The first one ('0') conflicts with the return code of 0 from 204 * pcap_offline_read() meaning "end of file". 205 */ 206 return (p->read_op(p, 1, pcap_fakecallback, (u_char *)&s)); 207} 208 209/* 210 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 211 */ 212void 213pcap_breakloop(pcap_t *p) 214{ 215 p->break_loop = 1; 216} 217 218int 219pcap_datalink(pcap_t *p) 220{ 221 return (p->linktype); 222} 223 224int 225pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 226{ 227 if (p->dlt_count == 0) { 228 /* 229 * We couldn't fetch the list of DLTs, which means 230 * this platform doesn't support changing the 231 * DLT for an interface. Return a list of DLTs 232 * containing only the DLT this device supports. 233 */ 234 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 235 if (*dlt_buffer == NULL) { 236 (void)snprintf(p->errbuf, sizeof(p->errbuf), 237 "malloc: %s", pcap_strerror(errno)); 238 return (-1); 239 } 240 **dlt_buffer = p->linktype; 241 return (1); 242 } else { 243 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer) * p->dlt_count); 244 if (*dlt_buffer == NULL) { 245 (void)snprintf(p->errbuf, sizeof(p->errbuf), 246 "malloc: %s", pcap_strerror(errno)); 247 return (-1); 248 } 249 (void)memcpy(*dlt_buffer, p->dlt_list, 250 sizeof(**dlt_buffer) * p->dlt_count); 251 return (p->dlt_count); 252 } 253} 254 255int 256pcap_set_datalink(pcap_t *p, int dlt) 257{ 258 int i; 259 const char *dlt_name; 260 261 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 262 /* 263 * We couldn't fetch the list of DLTs, or we don't 264 * have a "set datalink" operation, which means 265 * this platform doesn't support changing the 266 * DLT for an interface. Check whether the new 267 * DLT is the one this interface supports. 268 */ 269 if (p->linktype != dlt) 270 goto unsupported; 271 272 /* 273 * It is, so there's nothing we need to do here. 274 */ 275 return (0); 276 } 277 for (i = 0; i < p->dlt_count; i++) 278 if (p->dlt_list[i] == dlt) 279 break; 280 if (i >= p->dlt_count) 281 goto unsupported; 282 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 283 dlt == DLT_DOCSIS) { 284 /* 285 * This is presumably an Ethernet device, as the first 286 * link-layer type it offers is DLT_EN10MB, and the only 287 * other type it offers is DLT_DOCSIS. That means that 288 * we can't tell the driver to supply DOCSIS link-layer 289 * headers - we're just pretending that's what we're 290 * getting, as, presumably, we're capturing on a dedicated 291 * link to a Cisco Cable Modem Termination System, and 292 * it's putting raw DOCSIS frames on the wire inside low-level 293 * Ethernet framing. 294 */ 295 p->linktype = dlt; 296 return (0); 297 } 298 if (p->set_datalink_op(p, dlt) == -1) 299 return (-1); 300 p->linktype = dlt; 301 return (0); 302 303unsupported: 304 dlt_name = pcap_datalink_val_to_name(dlt); 305 if (dlt_name != NULL) { 306 (void) snprintf(p->errbuf, sizeof(p->errbuf), 307 "%s is not one of the DLTs supported by this device", 308 dlt_name); 309 } else { 310 (void) snprintf(p->errbuf, sizeof(p->errbuf), 311 "DLT %d is not one of the DLTs supported by this device", 312 dlt); 313 } 314 return (-1); 315} 316 317struct dlt_choice { 318 const char *name; 319 const char *description; 320 int dlt; 321}; 322 323#define DLT_CHOICE(code, description) { #code, description, code } 324#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 325 326static struct dlt_choice dlt_choices[] = { 327 DLT_CHOICE(DLT_NULL, "BSD loopback"), 328 DLT_CHOICE(DLT_EN10MB, "Ethernet"), 329 DLT_CHOICE(DLT_IEEE802, "Token ring"), 330 DLT_CHOICE(DLT_ARCNET, "ARCNET"), 331 DLT_CHOICE(DLT_SLIP, "SLIP"), 332 DLT_CHOICE(DLT_PPP, "PPP"), 333 DLT_CHOICE(DLT_FDDI, "FDDI"), 334 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"), 335 DLT_CHOICE(DLT_RAW, "Raw IP"), 336 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"), 337 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"), 338 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"), 339 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"), 340 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"), 341 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"), 342 DLT_CHOICE(DLT_IEEE802_11, "802.11"), 343 DLT_CHOICE(DLT_FRELAY, "Frame Relay"), 344 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"), 345 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"), 346 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"), 347 DLT_CHOICE(DLT_LTALK, "Localtalk"), 348 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"), 349 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"), 350 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 351 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"), 352 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus BSD radio information header"), 353 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 354 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"), 355 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"), 356 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"), 357 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 358 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"), 359 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"), 360 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"), 361 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 362 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"), 363 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"), 364 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 365 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"), 366 DLT_CHOICE(DLT_GPF_T, "GPF-T"), 367 DLT_CHOICE(DLT_GPF_F, "GPF-F"), 368 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"), 369 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 370 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"), 371 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"), 372 DLT_CHOICE_SENTINEL 373}; 374 375/* 376 * This array is designed for mapping upper and lower case letter 377 * together for a case independent comparison. The mappings are 378 * based upon ascii character sequences. 379 */ 380static const u_char charmap[] = { 381 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 382 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 383 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 384 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 385 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 386 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 387 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 388 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 389 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 390 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 391 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 392 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 393 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 394 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 395 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 396 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 397 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 398 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 399 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 400 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 401 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 402 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 403 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 404 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 405 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 406 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 407 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 408 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 409 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 410 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 411 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 412 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 413 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 414 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 415 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 416 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 417 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 418 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 419 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 420 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 421 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 422 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 423 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 424 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 425 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 426 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 427 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 428 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 429 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 430 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 431 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 432 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 433 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 434 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 435 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 436 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 437 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 438 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 439 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 440 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 441 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 442 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 443 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 444 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 445}; 446 447int 448pcap_strcasecmp(const char *s1, const char *s2) 449{ 450 register const u_char *cm = charmap, 451 *us1 = (u_char *)s1, 452 *us2 = (u_char *)s2; 453 454 while (cm[*us1] == cm[*us2++]) 455 if (*us1++ == '\0') 456 return(0); 457 return (cm[*us1] - cm[*--us2]); 458} 459 460int 461pcap_datalink_name_to_val(const char *name) 462{ 463 int i; 464 465 for (i = 0; dlt_choices[i].name != NULL; i++) { 466 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, 467 name) == 0) 468 return (dlt_choices[i].dlt); 469 } 470 return (-1); 471} 472 473const char * 474pcap_datalink_val_to_name(int dlt) 475{ 476 int i; 477 478 for (i = 0; dlt_choices[i].name != NULL; i++) { 479 if (dlt_choices[i].dlt == dlt) 480 return (dlt_choices[i].name + sizeof("DLT_") - 1); 481 } 482 return (NULL); 483} 484 485const char * 486pcap_datalink_val_to_description(int dlt) 487{ 488 int i; 489 490 for (i = 0; dlt_choices[i].name != NULL; i++) { 491 if (dlt_choices[i].dlt == dlt) 492 return (dlt_choices[i].description); 493 } 494 return (NULL); 495} 496 497int 498pcap_snapshot(pcap_t *p) 499{ 500 return (p->snapshot); 501} 502 503int 504pcap_is_swapped(pcap_t *p) 505{ 506 return (p->sf.swapped); 507} 508 509int 510pcap_major_version(pcap_t *p) 511{ 512 return (p->sf.version_major); 513} 514 515int 516pcap_minor_version(pcap_t *p) 517{ 518 return (p->sf.version_minor); 519} 520 521FILE * 522pcap_file(pcap_t *p) 523{ 524 return (p->sf.rfile); 525} 526 527int 528pcap_fileno(pcap_t *p) 529{ 530#ifndef WIN32 531 return (p->fd); 532#else 533 if (p->adapter != NULL) 534 return ((int)(DWORD)p->adapter->hFile); 535 else 536 return (-1); 537#endif 538} 539 540#if !defined(WIN32) && !defined(MSDOS) 541int 542pcap_get_selectable_fd(pcap_t *p) 543{ 544 return (p->selectable_fd); 545} 546#endif 547 548void 549pcap_perror(pcap_t *p, char *prefix) 550{ 551 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 552} 553 554char * 555pcap_geterr(pcap_t *p) 556{ 557 return (p->errbuf); 558} 559 560int 561pcap_getnonblock(pcap_t *p, char *errbuf) 562{ 563 return p->getnonblock_op(p, errbuf); 564} 565 566/* 567 * Get the current non-blocking mode setting, under the assumption that 568 * it's just the standard POSIX non-blocking flag. 569 * 570 * We don't look at "p->nonblock", in case somebody tweaked the FD 571 * directly. 572 */ 573#if !defined(WIN32) && !defined(MSDOS) 574int 575pcap_getnonblock_fd(pcap_t *p, char *errbuf) 576{ 577 int fdflags; 578 579 fdflags = fcntl(p->fd, F_GETFL, 0); 580 if (fdflags == -1) { 581 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 582 pcap_strerror(errno)); 583 return (-1); 584 } 585 if (fdflags & O_NONBLOCK) 586 return (1); 587 else 588 return (0); 589} 590#endif 591 592int 593pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 594{ 595 return p->setnonblock_op(p, nonblock, errbuf); 596} 597 598#if !defined(WIN32) && !defined(MSDOS) 599/* 600 * Set non-blocking mode, under the assumption that it's just the 601 * standard POSIX non-blocking flag. (This can be called by the 602 * per-platform non-blocking-mode routine if that routine also 603 * needs to do some additional work.) 604 */ 605int 606pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf) 607{ 608 int fdflags; 609 610 fdflags = fcntl(p->fd, F_GETFL, 0); 611 if (fdflags == -1) { 612 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 613 pcap_strerror(errno)); 614 return (-1); 615 } 616 if (nonblock) 617 fdflags |= O_NONBLOCK; 618 else 619 fdflags &= ~O_NONBLOCK; 620 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 621 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s", 622 pcap_strerror(errno)); 623 return (-1); 624 } 625 return (0); 626} 627#endif 628 629#ifdef WIN32 630/* 631 * Generate a string for the last Win32-specific error (i.e. an error generated when 632 * calling a Win32 API). 633 * For errors occurred during standard C calls, we still use pcap_strerror() 634 */ 635char * 636pcap_win32strerror(void) 637{ 638 DWORD error; 639 static char errbuf[PCAP_ERRBUF_SIZE+1]; 640 int errlen; 641 char *p; 642 643 error = GetLastError(); 644 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf, 645 PCAP_ERRBUF_SIZE, NULL); 646 647 /* 648 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the 649 * message. Get rid of it. 650 */ 651 errlen = strlen(errbuf); 652 if (errlen >= 2) { 653 errbuf[errlen - 1] = '\0'; 654 errbuf[errlen - 2] = '\0'; 655 } 656 p = strchr(errbuf, '\0'); 657 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error); 658 return (errbuf); 659} 660#endif 661 662/* 663 * Not all systems have strerror(). 664 */ 665char * 666pcap_strerror(int errnum) 667{ 668#ifdef HAVE_STRERROR 669 return (strerror(errnum)); 670#else 671 extern int sys_nerr; 672 extern const char *const sys_errlist[]; 673 static char ebuf[20]; 674 675 if ((unsigned int)errnum < sys_nerr) 676 return ((char *)sys_errlist[errnum]); 677 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 678 return(ebuf); 679#endif 680} 681 682int 683pcap_setfilter(pcap_t *p, struct bpf_program *fp) 684{ 685 return p->setfilter_op(p, fp); 686} 687 688int 689pcap_stats(pcap_t *p, struct pcap_stat *ps) 690{ 691 return p->stats_op(p, ps); 692} 693 694static int 695pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 696{ 697 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 698 "Statistics aren't available from a pcap_open_dead pcap_t"); 699 return (-1); 700} 701 702void 703pcap_close_common(pcap_t *p) 704{ 705 if (p->buffer != NULL) 706 free(p->buffer); 707#if !defined(WIN32) && !defined(MSDOS) 708 if (p->fd >= 0) 709 close(p->fd); 710#endif 711} 712 713static void 714pcap_close_dead(pcap_t *p _U_) 715{ 716 /* Nothing to do. */ 717} 718 719pcap_t * 720pcap_open_dead(int linktype, int snaplen) 721{ 722 pcap_t *p; 723 724 p = malloc(sizeof(*p)); 725 if (p == NULL) 726 return NULL; 727 memset (p, 0, sizeof(*p)); 728 p->snapshot = snaplen; 729 p->linktype = linktype; 730 p->stats_op = pcap_stats_dead; 731 p->close_op = pcap_close_dead; 732 return p; 733} 734 735/* 736 * API compatible with WinPcap's "send a packet" routine - returns -1 737 * on error, 0 otherwise. 738 * 739 * XXX - what if we get a short write? 740 */ 741int 742pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 743{ 744 if (p->inject_op(p, buf, size) == -1) 745 return (-1); 746 return (0); 747} 748 749/* 750 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 751 * error, number of bytes written otherwise. 752 */ 753int 754pcap_inject(pcap_t *p, const void *buf, size_t size) 755{ 756 return (p->inject_op(p, buf, size)); 757} 758 759void 760pcap_close(pcap_t *p) 761{ 762 p->close_op(p); 763 if (p->dlt_list != NULL) 764 free(p->dlt_list); 765 pcap_freecode(&p->fcode); 766 free(p); 767} 768 769/* 770 * We make the version string static, and return a pointer to it, rather 771 * than exporting the version string directly. On at least some UNIXes, 772 * if you import data from a shared library into an program, the data is 773 * bound into the program binary, so if the string in the version of the 774 * library with which the program was linked isn't the same as the 775 * string in the version of the library with which the program is being 776 * run, various undesirable things may happen (warnings, the string 777 * being the one from the version of the library with which the program 778 * was linked, or even weirder things, such as the string being the one 779 * from the library but being truncated). 780 */ 781#ifdef HAVE_VERSION_H 782#include "version.h" 783#else 784static const char pcap_version_string[] = "libpcap version 0.9[.x]"; 785#endif 786 787#ifdef WIN32 788/* 789 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap 790 * version numbers when building WinPcap. (It'd be nice to do so for 791 * the packet.dll version number as well.) 792 */ 793static const char wpcap_version_string[] = "3.1"; 794static const char pcap_version_string_fmt[] = 795 "WinPcap version %s, based on %s"; 796static const char pcap_version_string_packet_dll_fmt[] = 797 "WinPcap version %s (packet.dll version %s), based on %s"; 798static char *full_pcap_version_string; 799 800const char * 801pcap_lib_version(void) 802{ 803 char *packet_version_string; 804 size_t full_pcap_version_string_len; 805 806 if (full_pcap_version_string == NULL) { 807 /* 808 * Generate the version string. 809 */ 810 packet_version_string = PacketGetVersion(); 811 if (strcmp(wpcap_version_string, packet_version_string) == 0) { 812 /* 813 * WinPcap version string and packet.dll version 814 * string are the same; just report the WinPcap 815 * version. 816 */ 817 full_pcap_version_string_len = 818 (sizeof pcap_version_string_fmt - 4) + 819 strlen(wpcap_version_string) + 820 strlen(pcap_version_string); 821 full_pcap_version_string = 822 malloc(full_pcap_version_string_len); 823 sprintf(full_pcap_version_string, 824 pcap_version_string_fmt, wpcap_version_string, 825 pcap_version_string); 826 } else { 827 /* 828 * WinPcap version string and packet.dll version 829 * string are different; that shouldn't be the 830 * case (the two libraries should come from the 831 * same version of WinPcap), so we report both 832 * versions. 833 */ 834 full_pcap_version_string_len = 835 (sizeof pcap_version_string_packet_dll_fmt - 6) + 836 strlen(wpcap_version_string) + 837 strlen(packet_version_string) + 838 strlen(pcap_version_string); 839 full_pcap_version_string = malloc(full_pcap_version_string_len); 840 841 sprintf(full_pcap_version_string, 842 pcap_version_string_packet_dll_fmt, 843 wpcap_version_string, packet_version_string, 844 pcap_version_string); 845 } 846 } 847 return (full_pcap_version_string); 848} 849 850#elif defined(MSDOS) 851 852static char *full_pcap_version_string; 853 854const char * 855pcap_lib_version (void) 856{ 857 char *packet_version_string; 858 size_t full_pcap_version_string_len; 859 static char dospfx[] = "DOS-"; 860 861 if (full_pcap_version_string == NULL) { 862 /* 863 * Generate the version string. 864 */ 865 full_pcap_version_string_len = 866 sizeof dospfx + strlen(pcap_version_string); 867 full_pcap_version_string = 868 malloc(full_pcap_version_string_len); 869 strcpy(full_pcap_version_string, dospfx); 870 strcat(full_pcap_version_string, pcap_version_string); 871 } 872 return (full_pcap_version_string); 873} 874 875#else /* UN*X */ 876 877const char * 878pcap_lib_version(void) 879{ 880 return (pcap_version_string); 881} 882#endif 883