inet.c revision 199231
1131377Stjr/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2131377Stjr/* 3131377Stjr * Copyright (c) 1994, 1995, 1996, 1997, 1998 4131377Stjr * The Regents of the University of California. All rights reserved. 5131377Stjr * 6131377Stjr * Redistribution and use in source and binary forms, with or without 7131377Stjr * modification, are permitted provided that the following conditions 8131377Stjr * are met: 9131377Stjr * 1. Redistributions of source code must retain the above copyright 10131377Stjr * notice, this list of conditions and the following disclaimer. 11131377Stjr * 2. Redistributions in binary form must reproduce the above copyright 12131377Stjr * notice, this list of conditions and the following disclaimer in the 13131377Stjr * documentation and/or other materials provided with the distribution. 14131377Stjr * 3. All advertising materials mentioning features or use of this software 15131377Stjr * must display the following acknowledgement: 16131377Stjr * This product includes software developed by the Computer Systems 17131377Stjr * Engineering Group at Lawrence Berkeley Laboratory. 18131377Stjr * 4. Neither the name of the University nor of the Laboratory may be used 19131377Stjr * to endorse or promote products derived from this software without 20131377Stjr * specific prior written permission. 21131377Stjr * 22131377Stjr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23131377Stjr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24131377Stjr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25131377Stjr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26131377Stjr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27131377Stjr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28131377Stjr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29131377Stjr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30131377Stjr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31131377Stjr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32131377Stjr * SUCH DAMAGE. 33131377Stjr */ 34131377Stjr 35131377Stjr#ifndef lint 36131377Stjrstatic const char rcsid[] _U_ = 37131377Stjr "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.75.2.4 2008-04-20 18:19:24 guy Exp $ (LBL)"; 38131377Stjr#endif 39131377Stjr 40131377Stjr#ifdef HAVE_CONFIG_H 41131377Stjr#include "config.h" 42131377Stjr#endif 43131377Stjr 44131377Stjr#ifdef WIN32 45131377Stjr#include <pcap-stdinc.h> 46131377Stjr#else /* WIN32 */ 47131377Stjr 48131377Stjr#include <sys/param.h> 49131377Stjr#ifndef MSDOS 50131377Stjr#include <sys/file.h> 51131377Stjr#endif 52131377Stjr#include <sys/ioctl.h> 53131377Stjr#include <sys/socket.h> 54131377Stjr#ifdef HAVE_SYS_SOCKIO_H 55131377Stjr#include <sys/sockio.h> 56131377Stjr#endif 57131377Stjr 58131377Stjrstruct mbuf; /* Squelch compiler warnings on some platforms for */ 59131377Stjrstruct rtentry; /* declarations in <net/if.h> */ 60131377Stjr#include <net/if.h> 61131377Stjr#include <netinet/in.h> 62131377Stjr#endif /* WIN32 */ 63131377Stjr 64131377Stjr#include <ctype.h> 65131377Stjr#include <errno.h> 66131377Stjr#include <memory.h> 67131377Stjr#include <stdio.h> 68131377Stjr#include <stdlib.h> 69131377Stjr#include <string.h> 70131377Stjr#if !defined(WIN32) && !defined(__BORLANDC__) 71131377Stjr#include <unistd.h> 72131377Stjr#endif /* !WIN32 && !__BORLANDC__ */ 73131377Stjr#ifdef HAVE_LIMITS_H 74131377Stjr#include <limits.h> 75131377Stjr#else 76131377Stjr#define INT_MAX 2147483647 77131377Stjr#endif 78131377Stjr 79131377Stjr#include "pcap-int.h" 80131377Stjr 81131377Stjr#ifdef HAVE_OS_PROTO_H 82131377Stjr#include "os-proto.h" 83131377Stjr#endif 84131377Stjr 85131377Stjr/* Not all systems have IFF_LOOPBACK */ 86131377Stjr#ifdef IFF_LOOPBACK 87131377Stjr#define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK) 88131377Stjr#else 89131377Stjr#define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \ 90131377Stjr (isdigit((unsigned char)((name)[2])) || (name)[2] == '\0')) 91131377Stjr#endif 92131377Stjr 93131377Stjrstruct sockaddr * 94131377Stjrdup_sockaddr(struct sockaddr *sa, size_t sa_length) 95131377Stjr{ 96131377Stjr struct sockaddr *newsa; 97131377Stjr 98131377Stjr if ((newsa = malloc(sa_length)) == NULL) 99131377Stjr return (NULL); 100131377Stjr return (memcpy(newsa, sa, sa_length)); 101131377Stjr} 102131377Stjr 103131377Stjrstatic int 104131377Stjrget_instance(const char *name) 105131377Stjr{ 106131377Stjr const char *cp, *endcp; 107131377Stjr int n; 108131377Stjr 109131377Stjr if (strcmp(name, "any") == 0) { 110131377Stjr /* 111131377Stjr * Give the "any" device an artificially high instance 112131377Stjr * number, so it shows up after all other non-loopback 113131377Stjr * interfaces. 114131377Stjr */ 115131377Stjr return INT_MAX; 116131377Stjr } 117131377Stjr 118131377Stjr endcp = name + strlen(name); 119131377Stjr for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp) 120131377Stjr continue; 121131377Stjr 122131377Stjr if (isdigit((unsigned char)*cp)) 123131377Stjr n = atoi(cp); 124131377Stjr else 125131377Stjr n = 0; 126131377Stjr return (n); 127131377Stjr} 128131377Stjr 129131377Stjrint 130131377Stjradd_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name, 131131377Stjr u_int flags, const char *description, char *errbuf) 132131377Stjr{ 133131377Stjr pcap_t *p; 134131377Stjr pcap_if_t *curdev, *prevdev, *nextdev; 135131377Stjr int this_instance; 136131377Stjr 137131377Stjr /* 138131377Stjr * Is there already an entry in the list for this interface? 139131377Stjr */ 140131377Stjr for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) { 141131377Stjr if (strcmp(name, curdev->name) == 0) 142131377Stjr break; /* yes, we found it */ 143131377Stjr } 144131377Stjr 145131377Stjr if (curdev == NULL) { 146131377Stjr /* 147131377Stjr * No, we didn't find it. 148131377Stjr * 149131377Stjr * Can we open this interface for live capture? 150131377Stjr * 151131377Stjr * We do this check so that interfaces that are 152131377Stjr * supplied by the interface enumeration mechanism 153131377Stjr * we're using but that don't support packet capture 154131377Stjr * aren't included in the list. Loopback interfaces 155131377Stjr * on Solaris are an example of this; we don't just 156131377Stjr * omit loopback interfaces on all platforms because 157131377Stjr * you *can* capture on loopback interfaces on some 158131377Stjr * OSes. 159131377Stjr * 160131377Stjr * On OS X, we don't do this check if the device 161131377Stjr * name begins with "wlt"; at least some versions 162131377Stjr * of OS X offer monitor mode capturing by having 163131377Stjr * a separate "monitor mode" device for each wireless 164131377Stjr * adapter, rather than by implementing the ioctls 165131377Stjr * that {Free,Net,Open,DragonFly}BSD provide. 166131377Stjr * Opening that device puts the adapter into monitor 167131377Stjr * mode, which, at least for some adapters, causes 168131377Stjr * them to deassociate from the network with which 169131377Stjr * they're associated. 170131377Stjr * 171131377Stjr * Instead, we try to open the corresponding "en" 172131377Stjr * device (so that we don't end up with, for users 173131377Stjr * without sufficient privilege to open capture 174131377Stjr * devices, a list of adapters that only includes 175131377Stjr * the wlt devices). 176131377Stjr */ 177131377Stjr#ifdef __APPLE__ 178131377Stjr if (strncmp(name, "wlt", 3) == 0) { 179131377Stjr char *en_name; 180131377Stjr size_t en_name_len; 181131377Stjr 182131377Stjr /* 183131377Stjr * Try to allocate a buffer for the "en" 184131377Stjr * device's name. 185131377Stjr */ 186131377Stjr en_name_len = strlen(name) - 1; 187131377Stjr en_name = malloc(en_name_len + 1); 188131377Stjr if (en_name == NULL) { 189131377Stjr (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 190131377Stjr "malloc: %s", pcap_strerror(errno)); 191131377Stjr return (-1); 192131377Stjr } 193131377Stjr strcpy(en_name, "en"); 194131377Stjr strcat(en_name, name + 3); 195131377Stjr p = pcap_open_live(en_name, 68, 0, 0, errbuf); 196131377Stjr free(en_name); 197131377Stjr } else 198131377Stjr#endif /* __APPLE */ 199131377Stjr p = pcap_open_live(name, 68, 0, 0, errbuf); 200131377Stjr if (p == NULL) { 201131377Stjr /* 202131377Stjr * No. Don't bother including it. 203131377Stjr * Don't treat this as an error, though. 204131377Stjr */ 205131377Stjr *curdev_ret = NULL; 206131377Stjr return (0); 207131377Stjr } 208131377Stjr pcap_close(p); 209131377Stjr 210131377Stjr /* 211131377Stjr * Yes, we can open it. 212131377Stjr * Allocate a new entry. 213131377Stjr */ 214131377Stjr curdev = malloc(sizeof(pcap_if_t)); 215131377Stjr if (curdev == NULL) { 216131377Stjr (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 217131377Stjr "malloc: %s", pcap_strerror(errno)); 218131377Stjr return (-1); 219131377Stjr } 220131377Stjr 221131377Stjr /* 222131377Stjr * Fill in the entry. 223131377Stjr */ 224131377Stjr curdev->next = NULL; 225131377Stjr curdev->name = strdup(name); 226131377Stjr if (curdev->name == NULL) { 227131377Stjr (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 228131377Stjr "malloc: %s", pcap_strerror(errno)); 229131377Stjr free(curdev); 230131377Stjr return (-1); 231131377Stjr } 232131377Stjr if (description != NULL) { 233131377Stjr /* 234131377Stjr * We have a description for this interface. 235131377Stjr */ 236131377Stjr curdev->description = strdup(description); 237131377Stjr if (curdev->description == NULL) { 238131377Stjr (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 239131377Stjr "malloc: %s", pcap_strerror(errno)); 240131377Stjr free(curdev->name); 241131377Stjr free(curdev); 242131377Stjr return (-1); 243131377Stjr } 244131377Stjr } else { 245131377Stjr /* 246131377Stjr * We don't. 247131377Stjr */ 248131377Stjr curdev->description = NULL; 249131377Stjr } 250131377Stjr curdev->addresses = NULL; /* list starts out as empty */ 251131377Stjr curdev->flags = 0; 252131377Stjr if (ISLOOPBACK(name, flags)) 253131377Stjr curdev->flags |= PCAP_IF_LOOPBACK; 254131377Stjr 255131377Stjr /* 256131377Stjr * Add it to the list, in the appropriate location. 257131377Stjr * First, get the instance number of this interface. 258131377Stjr */ 259131377Stjr this_instance = get_instance(name); 260131377Stjr 261131377Stjr /* 262131377Stjr * Now look for the last interface with an instance number 263131377Stjr * less than or equal to the new interface's instance 264131377Stjr * number - except that non-loopback interfaces are 265131377Stjr * arbitrarily treated as having interface numbers less 266131377Stjr * than those of loopback interfaces, so the loopback 267131377Stjr * interfaces are put at the end of the list. 268131377Stjr * 269131377Stjr * We start with "prevdev" being NULL, meaning we're before 270131377Stjr * the first element in the list. 271131377Stjr */ 272131377Stjr prevdev = NULL; 273131377Stjr for (;;) { 274131377Stjr /* 275131377Stjr * Get the interface after this one. 276131377Stjr */ 277131377Stjr if (prevdev == NULL) { 278131377Stjr /* 279131377Stjr * The next element is the first element. 280131377Stjr */ 281131377Stjr nextdev = *alldevs; 282131377Stjr } else 283131377Stjr nextdev = prevdev->next; 284131377Stjr 285131377Stjr /* 286131377Stjr * Are we at the end of the list? 287131377Stjr */ 288131377Stjr if (nextdev == NULL) { 289131377Stjr /* 290131377Stjr * Yes - we have to put the new entry 291131377Stjr * after "prevdev". 292131377Stjr */ 293131377Stjr break; 294131377Stjr } 295131377Stjr 296131377Stjr /* 297131377Stjr * Is the new interface a non-loopback interface 298131377Stjr * and the next interface a loopback interface? 299131377Stjr */ 300131377Stjr if (!(curdev->flags & PCAP_IF_LOOPBACK) && 301131377Stjr (nextdev->flags & PCAP_IF_LOOPBACK)) { 302131377Stjr /* 303131377Stjr * Yes, we should put the new entry 304131377Stjr * before "nextdev", i.e. after "prevdev". 305131377Stjr */ 306131377Stjr break; 307131377Stjr } 308131377Stjr 309131377Stjr /* 310131377Stjr * Is the new interface's instance number less 311131377Stjr * than the next interface's instance number, 312131377Stjr * and is it the case that the new interface is a 313131377Stjr * non-loopback interface or the next interface is 314131377Stjr * a loopback interface? 315131377Stjr * 316131377Stjr * (The goal of both loopback tests is to make 317131377Stjr * sure that we never put a loopback interface 318131377Stjr * before any non-loopback interface and that we 319131377Stjr * always put a non-loopback interface before all 320131377Stjr * loopback interfaces.) 321131377Stjr */ 322131377Stjr if (this_instance < get_instance(nextdev->name) && 323131377Stjr (!(curdev->flags & PCAP_IF_LOOPBACK) || 324131377Stjr (nextdev->flags & PCAP_IF_LOOPBACK))) { 325131377Stjr /* 326131377Stjr * Yes - we should put the new entry 327131377Stjr * before "nextdev", i.e. after "prevdev". 328131377Stjr */ 329131377Stjr break; 330131377Stjr } 331131377Stjr 332131377Stjr prevdev = nextdev; 333131377Stjr } 334131377Stjr 335131377Stjr /* 336131377Stjr * Insert before "nextdev". 337131377Stjr */ 338131377Stjr curdev->next = nextdev; 339131377Stjr 340131377Stjr /* 341131377Stjr * Insert after "prevdev" - unless "prevdev" is null, 342131377Stjr * in which case this is the first interface. 343131377Stjr */ 344131377Stjr if (prevdev == NULL) { 345131377Stjr /* 346131377Stjr * This is the first interface. Pass back a 347131377Stjr * pointer to it, and put "curdev" before 348131377Stjr * "nextdev". 349131377Stjr */ 350131377Stjr *alldevs = curdev; 351131377Stjr } else 352131377Stjr prevdev->next = curdev; 353131377Stjr } 354131377Stjr 355131377Stjr *curdev_ret = curdev; 356131377Stjr return (0); 357131377Stjr} 358131377Stjr 359131377Stjr/* 360131377Stjr * XXX - on FreeBSDs that support it, should it get the sysctl named 361131377Stjr * "dev.{adapter family name}.{adapter unit}.%desc" to get a description 362131377Stjr * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800" 363131377Stjr * with my Cisco 350 card, so the name isn't entirely descriptive. The 364131377Stjr * "dev.an.0.%pnpinfo" has a better description, although one might argue 365131377Stjr * that the problem is really a driver bug - if it can find out that it's 366131377Stjr * a Cisco 340 or 350, rather than an old Aironet card, it should use 367131377Stjr * that in the description. 368131377Stjr * 369131377Stjr * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? OpenBSD 370131377Stjr * lets you get a description, but it's not generated by the OS, it's 371131377Stjr * set with another ioctl that ifconfig supports; we use that to get 372131377Stjr * the description in OpenBSD. 373131377Stjr * 374131377Stjr * In OS X, the System Configuration framework can apparently return 375131377Stjr * names in 10.4 and later; it also appears that freedesktop.org's HAL 376131377Stjr * offers an "info.product" string, but the HAL specification says 377131377Stjr * it "should not be used in any UI" and "subsystem/capability 378131377Stjr * specific properties" should be used instead. Using that would 379131377Stjr * require that libpcap applications be linked with the frameworks/ 380131377Stjr * libraries in question, which would be a bit of a pain unless we 381131377Stjr * offer, for example, a pkg-config: 382131377Stjr * 383131377Stjr * http://pkg-config.freedesktop.org/wiki/ 384131377Stjr * 385131377Stjr * script, so applications can just use that script to find out what 386131377Stjr * libraries you need to link with when linking with libpcap. 387131377Stjr * pkg-config is GPLed; I don't know whether that would prevent its 388131377Stjr * use with a BSD-licensed library such as libpcap. 389131377Stjr * 390131377Stjr * Do any other UN*Xes, or desktop environments support getting a 391131377Stjr * description? 392131377Stjr */ 393131377Stjrint 394131377Stjradd_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags, 395131377Stjr struct sockaddr *addr, size_t addr_size, 396131377Stjr struct sockaddr *netmask, size_t netmask_size, 397131377Stjr struct sockaddr *broadaddr, size_t broadaddr_size, 398131377Stjr struct sockaddr *dstaddr, size_t dstaddr_size, 399131377Stjr char *errbuf) 400131377Stjr{ 401131377Stjr pcap_if_t *curdev; 402131377Stjr char *description = NULL; 403131377Stjr pcap_addr_t *curaddr, *prevaddr, *nextaddr; 404131377Stjr#ifdef SIOCGIFDESCR 405131377Stjr struct ifreq ifrdesc; 406131377Stjr char ifdescr[IFDESCRSIZE]; 407131377Stjr int s; 408131377Stjr#endif 409131377Stjr 410131377Stjr#ifdef SIOCGIFDESCR 411131377Stjr /* 412131377Stjr * Get the description for the interface. 413131377Stjr */ 414131377Stjr memset(&ifrdesc, 0, sizeof ifrdesc); 415131377Stjr strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name); 416131377Stjr ifrdesc.ifr_data = (caddr_t)&ifdescr; 417131377Stjr s = socket(AF_INET, SOCK_DGRAM, 0); 418131377Stjr if (s >= 0) { 419131377Stjr if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0 && 420131377Stjr strlen(ifrdesc.ifr_data) != 0) 421131377Stjr description = ifrdesc.ifr_data; 422131377Stjr close(s); 423131377Stjr } 424131377Stjr#endif 425131377Stjr 426131377Stjr if (add_or_find_if(&curdev, alldevs, name, flags, description, 427131377Stjr errbuf) == -1) { 428131377Stjr /* 429131377Stjr * Error - give up. 430131377Stjr */ 431131377Stjr return (-1); 432131377Stjr } 433131377Stjr if (curdev == NULL) { 434131377Stjr /* 435131377Stjr * Device wasn't added because it can't be opened. 436131377Stjr * Not a fatal error. 437131377Stjr */ 438131377Stjr return (0); 439131377Stjr } 440131377Stjr 441131377Stjr /* 442 * "curdev" is an entry for this interface; add an entry for this 443 * address to its list of addresses. 444 * 445 * Allocate the new entry and fill it in. 446 */ 447 curaddr = malloc(sizeof(pcap_addr_t)); 448 if (curaddr == NULL) { 449 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 450 "malloc: %s", pcap_strerror(errno)); 451 return (-1); 452 } 453 454 curaddr->next = NULL; 455 if (addr != NULL) { 456 curaddr->addr = dup_sockaddr(addr, addr_size); 457 if (curaddr->addr == NULL) { 458 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 459 "malloc: %s", pcap_strerror(errno)); 460 free(curaddr); 461 return (-1); 462 } 463 } else 464 curaddr->addr = NULL; 465 466 if (netmask != NULL) { 467 curaddr->netmask = dup_sockaddr(netmask, netmask_size); 468 if (curaddr->netmask == NULL) { 469 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 470 "malloc: %s", pcap_strerror(errno)); 471 if (curaddr->addr != NULL) 472 free(curaddr->addr); 473 free(curaddr); 474 return (-1); 475 } 476 } else 477 curaddr->netmask = NULL; 478 479 if (broadaddr != NULL) { 480 curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size); 481 if (curaddr->broadaddr == NULL) { 482 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 483 "malloc: %s", pcap_strerror(errno)); 484 if (curaddr->netmask != NULL) 485 free(curaddr->netmask); 486 if (curaddr->addr != NULL) 487 free(curaddr->addr); 488 free(curaddr); 489 return (-1); 490 } 491 } else 492 curaddr->broadaddr = NULL; 493 494 if (dstaddr != NULL) { 495 curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size); 496 if (curaddr->dstaddr == NULL) { 497 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 498 "malloc: %s", pcap_strerror(errno)); 499 if (curaddr->broadaddr != NULL) 500 free(curaddr->broadaddr); 501 if (curaddr->netmask != NULL) 502 free(curaddr->netmask); 503 if (curaddr->addr != NULL) 504 free(curaddr->addr); 505 free(curaddr); 506 return (-1); 507 } 508 } else 509 curaddr->dstaddr = NULL; 510 511 /* 512 * Find the end of the list of addresses. 513 */ 514 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { 515 nextaddr = prevaddr->next; 516 if (nextaddr == NULL) { 517 /* 518 * This is the end of the list. 519 */ 520 break; 521 } 522 } 523 524 if (prevaddr == NULL) { 525 /* 526 * The list was empty; this is the first member. 527 */ 528 curdev->addresses = curaddr; 529 } else { 530 /* 531 * "prevaddr" is the last member of the list; append 532 * this member to it. 533 */ 534 prevaddr->next = curaddr; 535 } 536 537 return (0); 538} 539 540int 541pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags, 542 const char *description, char *errbuf) 543{ 544 pcap_if_t *curdev; 545 546 return (add_or_find_if(&curdev, devlist, name, flags, description, 547 errbuf)); 548} 549 550 551/* 552 * Free a list of interfaces. 553 */ 554void 555pcap_freealldevs(pcap_if_t *alldevs) 556{ 557 pcap_if_t *curdev, *nextdev; 558 pcap_addr_t *curaddr, *nextaddr; 559 560 for (curdev = alldevs; curdev != NULL; curdev = nextdev) { 561 nextdev = curdev->next; 562 563 /* 564 * Free all addresses. 565 */ 566 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { 567 nextaddr = curaddr->next; 568 if (curaddr->addr) 569 free(curaddr->addr); 570 if (curaddr->netmask) 571 free(curaddr->netmask); 572 if (curaddr->broadaddr) 573 free(curaddr->broadaddr); 574 if (curaddr->dstaddr) 575 free(curaddr->dstaddr); 576 free(curaddr); 577 } 578 579 /* 580 * Free the name string. 581 */ 582 free(curdev->name); 583 584 /* 585 * Free the description string, if any. 586 */ 587 if (curdev->description != NULL) 588 free(curdev->description); 589 590 /* 591 * Free the interface. 592 */ 593 free(curdev); 594 } 595} 596 597#if !defined(WIN32) && !defined(MSDOS) 598 599/* 600 * Return the name of a network interface attached to the system, or NULL 601 * if none can be found. The interface must be configured up; the 602 * lowest unit number is preferred; loopback is ignored. 603 */ 604char * 605pcap_lookupdev(errbuf) 606 register char *errbuf; 607{ 608 pcap_if_t *alldevs; 609/* for old BSD systems, including bsdi3 */ 610#ifndef IF_NAMESIZE 611#define IF_NAMESIZE IFNAMSIZ 612#endif 613 static char device[IF_NAMESIZE + 1]; 614 char *ret; 615 616 if (pcap_findalldevs(&alldevs, errbuf) == -1) 617 return (NULL); 618 619 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { 620 /* 621 * There are no devices on the list, or the first device 622 * on the list is a loopback device, which means there 623 * are no non-loopback devices on the list. This means 624 * we can't return any device. 625 * 626 * XXX - why not return a loopback device? If we can't 627 * capture on it, it won't be on the list, and if it's 628 * on the list, there aren't any non-loopback devices, 629 * so why not just supply it as the default device? 630 */ 631 (void)strlcpy(errbuf, "no suitable device found", 632 PCAP_ERRBUF_SIZE); 633 ret = NULL; 634 } else { 635 /* 636 * Return the name of the first device on the list. 637 */ 638 (void)strlcpy(device, alldevs->name, sizeof(device)); 639 ret = device; 640 } 641 642 pcap_freealldevs(alldevs); 643 return (ret); 644} 645 646int 647pcap_lookupnet(device, netp, maskp, errbuf) 648 register const char *device; 649 register bpf_u_int32 *netp, *maskp; 650 register char *errbuf; 651{ 652 register int fd; 653 register struct sockaddr_in *sin4; 654 struct ifreq ifr; 655 656 /* 657 * The pseudo-device "any" listens on all interfaces and therefore 658 * has the network address and -mask "0.0.0.0" therefore catching 659 * all traffic. Using NULL for the interface is the same as "any". 660 */ 661 if (!device || strcmp(device, "any") == 0 662#ifdef HAVE_DAG_API 663 || strstr(device, "dag") != NULL 664#endif 665#ifdef HAVE_SEPTEL_API 666 || strstr(device, "septel") != NULL 667#endif 668#ifdef PCAP_SUPPORT_BT 669 || strstr(device, "bluetooth") != NULL 670#endif 671#ifdef PCAP_SUPPORT_USB 672 || strstr(device, "usb") != NULL 673#endif 674 ) { 675 *netp = *maskp = 0; 676 return 0; 677 } 678 679 fd = socket(AF_INET, SOCK_DGRAM, 0); 680 if (fd < 0) { 681 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s", 682 pcap_strerror(errno)); 683 return (-1); 684 } 685 memset(&ifr, 0, sizeof(ifr)); 686#ifdef linux 687 /* XXX Work around Linux kernel bug */ 688 ifr.ifr_addr.sa_family = AF_INET; 689#endif 690 (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 691 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 692 if (errno == EADDRNOTAVAIL) { 693 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 694 "%s: no IPv4 address assigned", device); 695 } else { 696 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 697 "SIOCGIFADDR: %s: %s", 698 device, pcap_strerror(errno)); 699 } 700 (void)close(fd); 701 return (-1); 702 } 703 sin4 = (struct sockaddr_in *)&ifr.ifr_addr; 704 *netp = sin4->sin_addr.s_addr; 705 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { 706 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 707 "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno)); 708 (void)close(fd); 709 return (-1); 710 } 711 (void)close(fd); 712 *maskp = sin4->sin_addr.s_addr; 713 if (*maskp == 0) { 714 if (IN_CLASSA(*netp)) 715 *maskp = IN_CLASSA_NET; 716 else if (IN_CLASSB(*netp)) 717 *maskp = IN_CLASSB_NET; 718 else if (IN_CLASSC(*netp)) 719 *maskp = IN_CLASSC_NET; 720 else { 721 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 722 "inet class for 0x%x unknown", *netp); 723 return (-1); 724 } 725 } 726 *netp &= *maskp; 727 return (0); 728} 729 730#elif defined(WIN32) 731 732/* 733 * Return the name of a network interface attached to the system, or NULL 734 * if none can be found. The interface must be configured up; the 735 * lowest unit number is preferred; loopback is ignored. 736 */ 737char * 738pcap_lookupdev(errbuf) 739 register char *errbuf; 740{ 741 DWORD dwVersion; 742 DWORD dwWindowsMajorVersion; 743 dwVersion = GetVersion(); /* get the OS version */ 744 dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion))); 745 746 if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) { 747 /* 748 * Windows 95, 98, ME. 749 */ 750 ULONG NameLength = 8192; 751 static char AdaptersName[8192]; 752 753 if (PacketGetAdapterNames(AdaptersName,&NameLength) ) 754 return (AdaptersName); 755 else 756 return NULL; 757 } else { 758 /* 759 * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility 760 */ 761 ULONG NameLength = 8192; 762 static WCHAR AdaptersName[8192]; 763 char *tAstr; 764 WCHAR *tUstr; 765 WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR)); 766 int NAdapts = 0; 767 768 if(TAdaptersName == NULL) 769 { 770 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure"); 771 return NULL; 772 } 773 774 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) ) 775 { 776 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, 777 "PacketGetAdapterNames: %s", 778 pcap_win32strerror()); 779 free(TAdaptersName); 780 return NULL; 781 } 782 783 784 tAstr = (char*)TAdaptersName; 785 tUstr = (WCHAR*)AdaptersName; 786 787 /* 788 * Convert and copy the device names 789 */ 790 while(sscanf(tAstr, "%S", tUstr) > 0) 791 { 792 tAstr += strlen(tAstr) + 1; 793 tUstr += wcslen(tUstr) + 1; 794 NAdapts ++; 795 } 796 797 tAstr++; 798 *tUstr = 0; 799 tUstr++; 800 801 /* 802 * Copy the descriptions 803 */ 804 while(NAdapts--) 805 { 806 strcpy((char*)tUstr, tAstr); 807 (char*)tUstr += strlen(tAstr) + 1;; 808 tAstr += strlen(tAstr) + 1; 809 } 810 811 free(TAdaptersName); 812 return (char *)(AdaptersName); 813 } 814} 815 816 817int 818pcap_lookupnet(device, netp, maskp, errbuf) 819 register const char *device; 820 register bpf_u_int32 *netp, *maskp; 821 register char *errbuf; 822{ 823 /* 824 * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo() 825 * in order to skip non IPv4 (i.e. IPv6 addresses) 826 */ 827 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES]; 828 LONG if_addr_size = 1; 829 struct sockaddr_in *t_addr; 830 unsigned int i; 831 832 if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) { 833 *netp = *maskp = 0; 834 return (0); 835 } 836 837 for(i=0; i<MAX_NETWORK_ADDRESSES; i++) 838 { 839 if(if_addrs[i].IPAddress.ss_family == AF_INET) 840 { 841 t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress); 842 *netp = t_addr->sin_addr.S_un.S_addr; 843 t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask); 844 *maskp = t_addr->sin_addr.S_un.S_addr; 845 846 *netp &= *maskp; 847 return (0); 848 } 849 850 } 851 852 *netp = *maskp = 0; 853 return (0); 854} 855 856#endif /* !WIN32 && !MSDOS */ 857