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
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36 static const char rcsid[] _U_ =
37 "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.75.2.4 2008-04-20 18:19:24 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 * Is there already an entry in the list for this interface?
140 for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) {
141 if (strcmp(name, curdev->name) == 0)
142 break; /* yes, we found it */
145 if (curdev == NULL) {
147 * No, we didn't find it.
149 * Can we open this interface for live capture?
151 * We do this check so that interfaces that are
152 * supplied by the interface enumeration mechanism
153 * we're using but that don't support packet capture
154 * aren't included in the list. Loopback interfaces
155 * on Solaris are an example of this; we don't just
156 * omit loopback interfaces on all platforms because
157 * you *can* capture on loopback interfaces on some
160 * On OS X, we don't do this check if the device
161 * name begins with "wlt"; at least some versions
162 * of OS X offer monitor mode capturing by having
163 * a separate "monitor mode" device for each wireless
164 * adapter, rather than by implementing the ioctls
165 * that {Free,Net,Open,DragonFly}BSD provide.
166 * Opening that device puts the adapter into monitor
167 * mode, which, at least for some adapters, causes
168 * them to deassociate from the network with which
169 * they're associated.
171 * Instead, we try to open the corresponding "en"
172 * device (so that we don't end up with, for users
173 * without sufficient privilege to open capture
174 * devices, a list of adapters that only includes
178 if (strncmp(name, "wlt", 3) == 0) {
183 * Try to allocate a buffer for the "en"
186 en_name_len = strlen(name) - 1;
187 en_name = malloc(en_name_len + 1);
188 if (en_name == NULL) {
189 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
190 "malloc: %s", pcap_strerror(errno));
193 strcpy(en_name, "en");
194 strcat(en_name, name + 3);
195 p = pcap_open_live(en_name, 68, 0, 0, errbuf);
199 p = pcap_open_live(name, 68, 0, 0, errbuf);
202 * No. Don't bother including it.
203 * Don't treat this as an error, though.
211 * Yes, we can open it.
212 * Allocate a new entry.
214 curdev = malloc(sizeof(pcap_if_t));
215 if (curdev == NULL) {
216 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
217 "malloc: %s", pcap_strerror(errno));
225 curdev->name = strdup(name);
226 if (curdev->name == NULL) {
227 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
228 "malloc: %s", pcap_strerror(errno));
232 if (description != NULL) {
234 * We have a description for this interface.
236 curdev->description = strdup(description);
237 if (curdev->description == NULL) {
238 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
239 "malloc: %s", pcap_strerror(errno));
248 curdev->description = NULL;
250 curdev->addresses = NULL; /* list starts out as empty */
252 if (ISLOOPBACK(name, flags))
253 curdev->flags |= PCAP_IF_LOOPBACK;
256 * Add it to the list, in the appropriate location.
257 * First, get the instance number of this interface.
259 this_instance = get_instance(name);
262 * Now look for the last interface with an instance number
263 * less than or equal to the new interface's instance
264 * number - except that non-loopback interfaces are
265 * arbitrarily treated as having interface numbers less
266 * than those of loopback interfaces, so the loopback
267 * interfaces are put at the end of the list.
269 * We start with "prevdev" being NULL, meaning we're before
270 * the first element in the list.
275 * Get the interface after this one.
277 if (prevdev == NULL) {
279 * The next element is the first element.
283 nextdev = prevdev->next;
286 * Are we at the end of the list?
288 if (nextdev == NULL) {
290 * Yes - we have to put the new entry
297 * Is the new interface a non-loopback interface
298 * and the next interface a loopback interface?
300 if (!(curdev->flags & PCAP_IF_LOOPBACK) &&
301 (nextdev->flags & PCAP_IF_LOOPBACK)) {
303 * Yes, we should put the new entry
304 * before "nextdev", i.e. after "prevdev".
310 * Is the new interface's instance number less
311 * than the next interface's instance number,
312 * and is it the case that the new interface is a
313 * non-loopback interface or the next interface is
314 * a loopback interface?
316 * (The goal of both loopback tests is to make
317 * sure that we never put a loopback interface
318 * before any non-loopback interface and that we
319 * always put a non-loopback interface before all
320 * loopback interfaces.)
322 if (this_instance < get_instance(nextdev->name) &&
323 (!(curdev->flags & PCAP_IF_LOOPBACK) ||
324 (nextdev->flags & PCAP_IF_LOOPBACK))) {
326 * Yes - we should put the new entry
327 * before "nextdev", i.e. after "prevdev".
336 * Insert before "nextdev".
338 curdev->next = nextdev;
341 * Insert after "prevdev" - unless "prevdev" is null,
342 * in which case this is the first interface.
344 if (prevdev == NULL) {
346 * This is the first interface. Pass back a
347 * pointer to it, and put "curdev" before
352 prevdev->next = curdev;
355 *curdev_ret = curdev;
360 * XXX - on FreeBSDs that support it, should it get the sysctl named
361 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
362 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
363 * with my Cisco 350 card, so the name isn't entirely descriptive. The
364 * "dev.an.0.%pnpinfo" has a better description, although one might argue
365 * that the problem is really a driver bug - if it can find out that it's
366 * a Cisco 340 or 350, rather than an old Aironet card, it should use
367 * that in the description.
369 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? OpenBSD
370 * lets you get a description, but it's not generated by the OS, it's
371 * set with another ioctl that ifconfig supports; we use that to get
372 * the description in OpenBSD.
374 * In OS X, the System Configuration framework can apparently return
375 * names in 10.4 and later; it also appears that freedesktop.org's HAL
376 * offers an "info.product" string, but the HAL specification says
377 * it "should not be used in any UI" and "subsystem/capability
378 * specific properties" should be used instead. Using that would
379 * require that libpcap applications be linked with the frameworks/
380 * libraries in question, which would be a bit of a pain unless we
381 * offer, for example, a pkg-config:
383 * http://pkg-config.freedesktop.org/wiki/
385 * script, so applications can just use that script to find out what
386 * libraries you need to link with when linking with libpcap.
387 * pkg-config is GPLed; I don't know whether that would prevent its
388 * use with a BSD-licensed library such as libpcap.
390 * Do any other UN*Xes, or desktop environments support getting a
394 add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags,
395 struct sockaddr *addr, size_t addr_size,
396 struct sockaddr *netmask, size_t netmask_size,
397 struct sockaddr *broadaddr, size_t broadaddr_size,
398 struct sockaddr *dstaddr, size_t dstaddr_size,
402 char *description = NULL;
403 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
405 struct ifreq ifrdesc;
406 char ifdescr[IFDESCRSIZE];
412 * Get the description for the interface.
414 memset(&ifrdesc, 0, sizeof ifrdesc);
415 strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
416 ifrdesc.ifr_data = (caddr_t)&ifdescr;
417 s = socket(AF_INET, SOCK_DGRAM, 0);
419 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0 &&
420 strlen(ifrdesc.ifr_data) != 0)
421 description = ifrdesc.ifr_data;
426 if (add_or_find_if(&curdev, alldevs, name, flags, description,
433 if (curdev == NULL) {
435 * Device wasn't added because it can't be opened.
442 * "curdev" is an entry for this interface; add an entry for this
443 * address to its list of addresses.
445 * Allocate the new entry and fill it in.
447 curaddr = malloc(sizeof(pcap_addr_t));
448 if (curaddr == NULL) {
449 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
450 "malloc: %s", pcap_strerror(errno));
454 curaddr->next = 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));
464 curaddr->addr = NULL;
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)
477 curaddr->netmask = NULL;
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)
492 curaddr->broadaddr = NULL;
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)
509 curaddr->dstaddr = NULL;
512 * Find the end of the list of addresses.
514 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
515 nextaddr = prevaddr->next;
516 if (nextaddr == NULL) {
518 * This is the end of the list.
524 if (prevaddr == NULL) {
526 * The list was empty; this is the first member.
528 curdev->addresses = curaddr;
531 * "prevaddr" is the last member of the list; append
534 prevaddr->next = curaddr;
541 pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
542 const char *description, char *errbuf)
546 return (add_or_find_if(&curdev, devlist, name, flags, description,
552 * Free a list of interfaces.
555 pcap_freealldevs(pcap_if_t *alldevs)
557 pcap_if_t *curdev, *nextdev;
558 pcap_addr_t *curaddr, *nextaddr;
560 for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
561 nextdev = curdev->next;
564 * Free all addresses.
566 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
567 nextaddr = curaddr->next;
570 if (curaddr->netmask)
571 free(curaddr->netmask);
572 if (curaddr->broadaddr)
573 free(curaddr->broadaddr);
574 if (curaddr->dstaddr)
575 free(curaddr->dstaddr);
580 * Free the name string.
585 * Free the description string, if any.
587 if (curdev->description != NULL)
588 free(curdev->description);
591 * Free the interface.
597 #if !defined(WIN32) && !defined(MSDOS)
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.
605 pcap_lookupdev(errbuf)
606 register char *errbuf;
609 /* for old BSD systems, including bsdi3 */
611 #define IF_NAMESIZE IFNAMSIZ
613 static char device[IF_NAMESIZE + 1];
616 if (pcap_findalldevs(&alldevs, errbuf) == -1)
619 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
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.
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?
631 (void)strlcpy(errbuf, "no suitable device found",
636 * Return the name of the first device on the list.
638 (void)strlcpy(device, alldevs->name, sizeof(device));
642 pcap_freealldevs(alldevs);
647 pcap_lookupnet(device, netp, maskp, errbuf)
648 register const char *device;
649 register bpf_u_int32 *netp, *maskp;
650 register char *errbuf;
653 register struct sockaddr_in *sin4;
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".
661 if (!device || strcmp(device, "any") == 0
663 || strstr(device, "dag") != NULL
665 #ifdef HAVE_SEPTEL_API
666 || strstr(device, "septel") != NULL
668 #ifdef PCAP_SUPPORT_BT
669 || strstr(device, "bluetooth") != NULL
671 #ifdef PCAP_SUPPORT_USB
672 || strstr(device, "usb") != NULL
679 fd = socket(AF_INET, SOCK_DGRAM, 0);
681 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
682 pcap_strerror(errno));
685 memset(&ifr, 0, sizeof(ifr));
687 /* XXX Work around Linux kernel bug */
688 ifr.ifr_addr.sa_family = AF_INET;
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);
696 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
697 "SIOCGIFADDR: %s: %s",
698 device, pcap_strerror(errno));
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));
712 *maskp = sin4->sin_addr.s_addr;
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;
721 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
722 "inet class for 0x%x unknown", *netp);
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.
738 pcap_lookupdev(errbuf)
739 register char *errbuf;
742 DWORD dwWindowsMajorVersion;
743 dwVersion = GetVersion(); /* get the OS version */
744 dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
746 if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
748 * Windows 95, 98, ME.
750 ULONG NameLength = 8192;
751 static char AdaptersName[8192];
753 if (PacketGetAdapterNames(AdaptersName,&NameLength) )
754 return (AdaptersName);
759 * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility
761 ULONG NameLength = 8192;
762 static WCHAR AdaptersName[8192];
765 WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR));
768 if(TAdaptersName == NULL)
770 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
774 if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
776 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
777 "PacketGetAdapterNames: %s",
778 pcap_win32strerror());
784 tAstr = (char*)TAdaptersName;
785 tUstr = (WCHAR*)AdaptersName;
788 * Convert and copy the device names
790 while(sscanf(tAstr, "%S", tUstr) > 0)
792 tAstr += strlen(tAstr) + 1;
793 tUstr += wcslen(tUstr) + 1;
802 * Copy the descriptions
806 strcpy((char*)tUstr, tAstr);
807 (char*)tUstr += strlen(tAstr) + 1;;
808 tAstr += strlen(tAstr) + 1;
812 return (char *)(AdaptersName);
818 pcap_lookupnet(device, netp, maskp, errbuf)
819 register const char *device;
820 register bpf_u_int32 *netp, *maskp;
821 register char *errbuf;
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)
827 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
828 LONG if_addr_size = 1;
829 struct sockaddr_in *t_addr;
832 if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
837 for(i=0; i<MAX_NETWORK_ADDRESSES; i++)
839 if(if_addrs[i].IPAddress.ss_family == AF_INET)
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;
856 #endif /* !WIN32 && !MSDOS */