1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
3 * Copyright (c) 1994, 1995, 1996, 1997, 1998
4 * The Regents of the University of California. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the Computer Systems
17 * Engineering Group at Lawrence Berkeley Laboratory.
18 * 4. Neither the name of the University nor of the Laboratory may be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
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24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 */