1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
3 * Copyright (c) 1994, 1995, 1996, 1997, 1998
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16 * This product includes software developed by the Computer Systems
17 * Engineering Group at Lawrence Berkeley Laboratory.
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36 static const char rcsid[] _U_ =
37 "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.66.2.2 2006/01/21 10:46:13 guy Exp $ (LBL)";
45 #include <pcap-stdinc.h>
48 #include <sys/param.h>
52 #include <sys/ioctl.h>
53 #include <sys/socket.h>
54 #ifdef HAVE_SYS_SOCKIO_H
55 #include <sys/sockio.h>
58 struct mbuf; /* Squelch compiler warnings on some platforms for */
59 struct rtentry; /* declarations in <net/if.h> */
61 #include <netinet/in.h>
70 #if !defined(WIN32) && !defined(__BORLANDC__)
72 #endif /* !WIN32 && !__BORLANDC__ */
76 #define INT_MAX 2147483647
81 #ifdef HAVE_OS_PROTO_H
85 /* Not all systems have IFF_LOOPBACK */
87 #define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK)
89 #define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \
90 (isdigit((unsigned char)((name)[2])) || (name)[2] == '\0'))
94 dup_sockaddr(struct sockaddr *sa, size_t sa_length)
96 struct sockaddr *newsa;
98 if ((newsa = malloc(sa_length)) == NULL)
100 return (memcpy(newsa, sa, sa_length));
104 get_instance(const char *name)
106 const char *cp, *endcp;
109 if (strcmp(name, "any") == 0) {
111 * Give the "any" device an artificially high instance
112 * number, so it shows up after all other non-loopback
118 endcp = name + strlen(name);
119 for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp)
122 if (isdigit((unsigned char)*cp))
130 add_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name,
131 u_int flags, const char *description, char *errbuf)
134 pcap_if_t *curdev, *prevdev, *nextdev;
138 * Can we open this interface for live capture?
140 * We do this check so that interfaces that ae supplied
141 * by the interface enumeration mechanism we're using
142 * but that don't support packet capture aren't included
143 * in the list. An example of this is loopback interfaces
144 * on Solaris; we don't just omit loopback interfaces
145 * becaue you *can* capture on loopback interfaces on some
148 p = pcap_open_live(name, 68, 0, 0, errbuf);
151 * No. Don't bother including it.
152 * Don't treat this as an error, though.
160 * Is there already an entry in the list for this interface?
162 for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) {
163 if (strcmp(name, curdev->name) == 0)
164 break; /* yes, we found it */
166 if (curdev == NULL) {
168 * No, we didn't find it.
169 * Allocate a new entry.
171 curdev = malloc(sizeof(pcap_if_t));
172 if (curdev == NULL) {
173 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
174 "malloc: %s", pcap_strerror(errno));
182 curdev->name = strdup(name);
183 if (curdev->name == NULL) {
184 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
185 "malloc: %s", pcap_strerror(errno));
189 if (description != NULL) {
191 * We have a description for this interface.
193 curdev->description = strdup(description);
194 if (curdev->description == NULL) {
195 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
196 "malloc: %s", pcap_strerror(errno));
205 curdev->description = NULL;
207 curdev->addresses = NULL; /* list starts out as empty */
209 if (ISLOOPBACK(name, flags))
210 curdev->flags |= PCAP_IF_LOOPBACK;
213 * Add it to the list, in the appropriate location.
214 * First, get the instance number of this interface.
216 this_instance = get_instance(name);
219 * Now look for the last interface with an instance number
220 * less than or equal to the new interface's instance
221 * number - except that non-loopback interfaces are
222 * arbitrarily treated as having interface numbers less
223 * than those of loopback interfaces, so the loopback
224 * interfaces are put at the end of the list.
226 * We start with "prevdev" being NULL, meaning we're before
227 * the first element in the list.
232 * Get the interface after this one.
234 if (prevdev == NULL) {
236 * The next element is the first element.
240 nextdev = prevdev->next;
243 * Are we at the end of the list?
245 if (nextdev == NULL) {
247 * Yes - we have to put the new entry
254 * Is the new interface a non-loopback interface
255 * and the next interface a loopback interface?
257 if (!(curdev->flags & PCAP_IF_LOOPBACK) &&
258 (nextdev->flags & PCAP_IF_LOOPBACK)) {
260 * Yes, we should put the new entry
261 * before "nextdev", i.e. after "prevdev".
267 * Is the new interface's instance number less
268 * than the next interface's instance number,
269 * and is it the case that the new interface is a
270 * non-loopback interface or the next interface is
271 * a loopback interface?
273 * (The goal of both loopback tests is to make
274 * sure that we never put a loopback interface
275 * before any non-loopback interface and that we
276 * always put a non-loopback interface before all
277 * loopback interfaces.)
279 if (this_instance < get_instance(nextdev->name) &&
280 (!(curdev->flags & PCAP_IF_LOOPBACK) ||
281 (nextdev->flags & PCAP_IF_LOOPBACK))) {
283 * Yes - we should put the new entry
284 * before "nextdev", i.e. after "prevdev".
293 * Insert before "nextdev".
295 curdev->next = nextdev;
298 * Insert after "prevdev" - unless "prevdev" is null,
299 * in which case this is the first interface.
301 if (prevdev == NULL) {
303 * This is the first interface. Pass back a
304 * pointer to it, and put "curdev" before
309 prevdev->next = curdev;
312 *curdev_ret = curdev;
317 add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags,
318 struct sockaddr *addr, size_t addr_size,
319 struct sockaddr *netmask, size_t netmask_size,
320 struct sockaddr *broadaddr, size_t broadaddr_size,
321 struct sockaddr *dstaddr, size_t dstaddr_size,
325 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
327 if (add_or_find_if(&curdev, alldevs, name, flags, NULL, errbuf) == -1) {
333 if (curdev == NULL) {
335 * Device wasn't added because it can't be opened.
342 * "curdev" is an entry for this interface; add an entry for this
343 * address to its list of addresses.
345 * Allocate the new entry and fill it in.
347 curaddr = malloc(sizeof(pcap_addr_t));
348 if (curaddr == NULL) {
349 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
350 "malloc: %s", pcap_strerror(errno));
354 curaddr->next = NULL;
356 curaddr->addr = dup_sockaddr(addr, addr_size);
357 if (curaddr->addr == NULL) {
358 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
359 "malloc: %s", pcap_strerror(errno));
364 curaddr->addr = NULL;
366 if (netmask != NULL) {
367 curaddr->netmask = dup_sockaddr(netmask, netmask_size);
368 if (curaddr->netmask == NULL) {
369 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
370 "malloc: %s", pcap_strerror(errno));
371 if (curaddr->addr != NULL)
377 curaddr->netmask = NULL;
379 if (broadaddr != NULL) {
380 curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size);
381 if (curaddr->broadaddr == NULL) {
382 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
383 "malloc: %s", pcap_strerror(errno));
384 if (curaddr->netmask != NULL)
385 free(curaddr->netmask);
386 if (curaddr->addr != NULL)
392 curaddr->broadaddr = NULL;
394 if (dstaddr != NULL) {
395 curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size);
396 if (curaddr->dstaddr == NULL) {
397 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
398 "malloc: %s", pcap_strerror(errno));
399 if (curaddr->broadaddr != NULL)
400 free(curaddr->broadaddr);
401 if (curaddr->netmask != NULL)
402 free(curaddr->netmask);
403 if (curaddr->addr != NULL)
409 curaddr->dstaddr = NULL;
412 * Find the end of the list of addresses.
414 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
415 nextaddr = prevaddr->next;
416 if (nextaddr == NULL) {
418 * This is the end of the list.
424 if (prevaddr == NULL) {
426 * The list was empty; this is the first member.
428 curdev->addresses = curaddr;
431 * "prevaddr" is the last member of the list; append
434 prevaddr->next = curaddr;
441 pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
442 const char *description, char *errbuf)
446 return (add_or_find_if(&curdev, devlist, name, flags, description,
452 * Free a list of interfaces.
455 pcap_freealldevs(pcap_if_t *alldevs)
457 pcap_if_t *curdev, *nextdev;
458 pcap_addr_t *curaddr, *nextaddr;
460 for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
461 nextdev = curdev->next;
464 * Free all addresses.
466 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
467 nextaddr = curaddr->next;
470 if (curaddr->netmask)
471 free(curaddr->netmask);
472 if (curaddr->broadaddr)
473 free(curaddr->broadaddr);
474 if (curaddr->dstaddr)
475 free(curaddr->dstaddr);
480 * Free the name string.
485 * Free the description string, if any.
487 if (curdev->description != NULL)
488 free(curdev->description);
491 * Free the interface.
497 #if !defined(WIN32) && !defined(MSDOS)
500 * Return the name of a network interface attached to the system, or NULL
501 * if none can be found. The interface must be configured up; the
502 * lowest unit number is preferred; loopback is ignored.
505 pcap_lookupdev(errbuf)
506 register char *errbuf;
509 /* for old BSD systems, including bsdi3 */
511 #define IF_NAMESIZE IFNAMSIZ
513 static char device[IF_NAMESIZE + 1];
516 if (pcap_findalldevs(&alldevs, errbuf) == -1)
519 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
521 * There are no devices on the list, or the first device
522 * on the list is a loopback device, which means there
523 * are no non-loopback devices on the list. This means
524 * we can't return any device.
526 * XXX - why not return a loopback device? If we can't
527 * capture on it, it won't be on the list, and if it's
528 * on the list, there aren't any non-loopback devices,
529 * so why not just supply it as the default device?
531 (void)strlcpy(errbuf, "no suitable device found",
536 * Return the name of the first device on the list.
538 (void)strlcpy(device, alldevs->name, sizeof(device));
542 pcap_freealldevs(alldevs);
547 pcap_lookupnet(device, netp, maskp, errbuf)
548 register const char *device;
549 register bpf_u_int32 *netp, *maskp;
550 register char *errbuf;
553 register struct sockaddr_in *sin;
557 * The pseudo-device "any" listens on all interfaces and therefore
558 * has the network address and -mask "0.0.0.0" therefore catching
559 * all traffic. Using NULL for the interface is the same as "any".
561 if (!device || strcmp(device, "any") == 0
563 || strstr(device, "dag") != NULL
565 #ifdef HAVE_SEPTEL_API
566 || strstr(device, "septel") != NULL
573 fd = socket(AF_INET, SOCK_DGRAM, 0);
575 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
576 pcap_strerror(errno));
579 memset(&ifr, 0, sizeof(ifr));
581 /* XXX Work around Linux kernel bug */
582 ifr.ifr_addr.sa_family = AF_INET;
584 (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
585 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
586 if (errno == EADDRNOTAVAIL) {
587 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
588 "%s: no IPv4 address assigned", device);
590 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
591 "SIOCGIFADDR: %s: %s",
592 device, pcap_strerror(errno));
597 sin = (struct sockaddr_in *)&ifr.ifr_addr;
598 *netp = sin->sin_addr.s_addr;
599 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
600 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
601 "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno));
606 *maskp = sin->sin_addr.s_addr;
608 if (IN_CLASSA(*netp))
609 *maskp = IN_CLASSA_NET;
610 else if (IN_CLASSB(*netp))
611 *maskp = IN_CLASSB_NET;
612 else if (IN_CLASSC(*netp))
613 *maskp = IN_CLASSC_NET;
615 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
616 "inet class for 0x%x unknown", *netp);
627 * Return the name of a network interface attached to the system, or NULL
628 * if none can be found. The interface must be configured up; the
629 * lowest unit number is preferred; loopback is ignored.
632 pcap_lookupdev(errbuf)
633 register char *errbuf;
636 DWORD dwWindowsMajorVersion;
637 dwVersion = GetVersion(); /* get the OS version */
638 dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
640 if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
642 * Windows 95, 98, ME.
644 ULONG NameLength = 8192;
645 static char AdaptersName[8192];
647 if (PacketGetAdapterNames(AdaptersName,&NameLength) )
648 return (AdaptersName);
653 * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility
655 ULONG NameLength = 8192;
656 static WCHAR AdaptersName[8192];
659 WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR));
662 if(TAdaptersName == NULL)
664 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
668 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
670 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
671 "PacketGetAdapterNames: %s",
672 pcap_win32strerror());
678 tAstr = (char*)TAdaptersName;
679 tUstr = (WCHAR*)AdaptersName;
682 * Convert and copy the device names
684 while(sscanf(tAstr, "%S", tUstr) > 0)
686 tAstr += strlen(tAstr) + 1;
687 tUstr += wcslen(tUstr) + 1;
696 * Copy the descriptions
700 strcpy((char*)tUstr, tAstr);
701 (char*)tUstr += strlen(tAstr) + 1;;
702 tAstr += strlen(tAstr) + 1;
706 return (char *)(AdaptersName);
712 pcap_lookupnet(device, netp, maskp, errbuf)
713 register const char *device;
714 register bpf_u_int32 *netp, *maskp;
715 register char *errbuf;
718 * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo()
719 * in order to skip non IPv4 (i.e. IPv6 addresses)
721 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
722 LONG if_addr_size = 1;
723 struct sockaddr_in *t_addr;
726 if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
731 for(i=0; i<MAX_NETWORK_ADDRESSES; i++)
733 if(if_addrs[i].IPAddress.ss_family == AF_INET)
735 t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress);
736 *netp = t_addr->sin_addr.S_un.S_addr;
737 t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask);
738 *maskp = t_addr->sin_addr.S_un.S_addr;
750 #endif /* !WIN32 && !MSDOS */