1 /*
2 * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the Politecnico di Torino, CACE Technologies
16 * nor the names of its contributors may be used to endorse or promote
17 * products derived from this software without specific prior written
18 * permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 */
33
34 #ifndef lint
35 static const char rcsid[] _U_ =
36 "@(#) $Header: /tcpdump/master/libpcap/fad-win32.c,v 1.15 2007-09-25 20:34:36 guy Exp $ (LBL)";
37 #endif
38
39 #ifdef HAVE_CONFIG_H
40 #include "config.h"
41 #endif
42
43 #include <pcap.h>
44 #include <pcap-int.h>
45 #include <Packet32.h>
46
47 #include <errno.h>
48
49 /*
50 * Add an entry to the list of addresses for an interface.
51 * "curdev" is the entry for that interface.
52 */
53 static int
add_addr_to_list(pcap_if_t * curdev,struct sockaddr * addr,struct sockaddr * netmask,struct sockaddr * broadaddr,struct sockaddr * dstaddr,char * errbuf)54 add_addr_to_list(pcap_if_t *curdev, struct sockaddr *addr,
55 struct sockaddr *netmask, struct sockaddr *broadaddr,
56 struct sockaddr *dstaddr, char *errbuf)
57 {
58 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
59
60 /*
61 * Allocate the new entry and fill it in.
62 */
63 curaddr = (pcap_addr_t*)malloc(sizeof(pcap_addr_t));
64 if (curaddr == NULL) {
65 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
66 "malloc: %s", pcap_strerror(errno));
67 return (-1);
68 }
69
70 curaddr->next = NULL;
71 if (addr != NULL) {
72 curaddr->addr = (struct sockaddr*)dup_sockaddr(addr, sizeof(struct sockaddr_storage));
73 if (curaddr->addr == NULL) {
74 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
75 "malloc: %s", pcap_strerror(errno));
76 free(curaddr);
77 return (-1);
78 }
79 } else
80 curaddr->addr = NULL;
81
82 if (netmask != NULL) {
83 curaddr->netmask = (struct sockaddr*)dup_sockaddr(netmask, sizeof(struct sockaddr_storage));
84 if (curaddr->netmask == NULL) {
85 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
86 "malloc: %s", pcap_strerror(errno));
87 free(curaddr);
88 return (-1);
89 }
90 } else
91 curaddr->netmask = NULL;
92
93 if (broadaddr != NULL) {
94 curaddr->broadaddr = (struct sockaddr*)dup_sockaddr(broadaddr, sizeof(struct sockaddr_storage));
95 if (curaddr->broadaddr == NULL) {
96 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
97 "malloc: %s", pcap_strerror(errno));
98 free(curaddr);
99 return (-1);
100 }
101 } else
102 curaddr->broadaddr = NULL;
103
104 if (dstaddr != NULL) {
105 curaddr->dstaddr = (struct sockaddr*)dup_sockaddr(dstaddr, sizeof(struct sockaddr_storage));
106 if (curaddr->dstaddr == NULL) {
107 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
108 "malloc: %s", pcap_strerror(errno));
109 free(curaddr);
110 return (-1);
111 }
112 } else
113 curaddr->dstaddr = NULL;
114
115 /*
116 * Find the end of the list of addresses.
117 */
118 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
119 nextaddr = prevaddr->next;
120 if (nextaddr == NULL) {
121 /*
122 * This is the end of the list.
123 */
124 break;
125 }
126 }
127
128 if (prevaddr == NULL) {
129 /*
130 * The list was empty; this is the first member.
131 */
132 curdev->addresses = curaddr;
133 } else {
134 /*
135 * "prevaddr" is the last member of the list; append
136 * this member to it.
137 */
138 prevaddr->next = curaddr;
139 }
140
141 return (0);
142 }
143
144
145 static int
pcap_add_if_win32(pcap_if_t ** devlist,char * name,const char * desc,char * errbuf)146 pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
147 char *errbuf)
148 {
149 pcap_if_t *curdev;
150 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
151 LONG if_addr_size;
152 int res = 0;
153
154 if_addr_size = MAX_NETWORK_ADDRESSES;
155
156 /*
157 * Add an entry for this interface, with no addresses.
158 */
159 if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
160 /*
161 * Failure.
162 */
163 return (-1);
164 }
165
166 /*
167 * Get the list of addresses for the interface.
168 */
169 if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
170 /*
171 * Failure.
172 *
173 * We don't return an error, because this can happen with
174 * NdisWan interfaces, and we want to supply them even
175 * if we can't supply their addresses.
176 *
177 * We return an entry with an empty address list.
178 */
179 return (0);
180 }
181
182 /*
183 * Now add the addresses.
184 */
185 while (if_addr_size-- > 0) {
186 /*
187 * "curdev" is an entry for this interface; add an entry for
188 * this address to its list of addresses.
189 */
190 if(curdev == NULL)
191 break;
192 res = add_addr_to_list(curdev,
193 (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
194 (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
195 (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
196 NULL,
197 errbuf);
198 if (res == -1) {
199 /*
200 * Failure.
201 */
202 break;
203 }
204 }
205
206 return (res);
207 }
208
209
210 /*
211 * Get a list of all interfaces that are up and that we can open.
212 * Returns -1 on error, 0 otherwise.
213 * The list, as returned through "alldevsp", may be null if no interfaces
214 * were up and could be opened.
215 *
216 * Win32 implementation, based on WinPcap
217 */
218 int
pcap_findalldevs_interfaces(pcap_if_t ** alldevsp,char * errbuf)219 pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
220 {
221 pcap_if_t *devlist = NULL;
222 int ret = 0;
223 const char *desc;
224 char *AdaptersName;
225 ULONG NameLength;
226 char *name;
227
228 /*
229 * Find out how big a buffer we need.
230 *
231 * This call should always return FALSE; if the error is
232 * ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
233 * the size of the buffer we need, otherwise there's a
234 * problem, and NameLength should be set to 0.
235 *
236 * It shouldn't require NameLength to be set, but,
237 * at least as of WinPcap 4.1.3, it checks whether
238 * NameLength is big enough before it checks for a
239 * NULL buffer argument, so, while it'll still do
240 * the right thing if NameLength is uninitialized and
241 * whatever junk happens to be there is big enough
242 * (because the pointer argument will be null), it's
243 * still reading an uninitialized variable.
244 */
245 NameLength = 0;
246 if (!PacketGetAdapterNames(NULL, &NameLength))
247 {
248 DWORD last_error = GetLastError();
249
250 if (last_error != ERROR_INSUFFICIENT_BUFFER)
251 {
252 snprintf(errbuf, PCAP_ERRBUF_SIZE,
253 "PacketGetAdapterNames: %s",
254 pcap_win32strerror());
255 return (-1);
256 }
257 }
258
259 if (NameLength > 0)
260 AdaptersName = (char*) malloc(NameLength);
261 else
262 {
263 *alldevsp = NULL;
264 return 0;
265 }
266 if (AdaptersName == NULL)
267 {
268 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
269 return (-1);
270 }
271
272 if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
273 snprintf(errbuf, PCAP_ERRBUF_SIZE,
274 "PacketGetAdapterNames: %s",
275 pcap_win32strerror());
276 free(AdaptersName);
277 return (-1);
278 }
279
280 /*
281 * "PacketGetAdapterNames()" returned a list of
282 * null-terminated ASCII interface name strings,
283 * terminated by a null string, followed by a list
284 * of null-terminated ASCII interface description
285 * strings, terminated by a null string.
286 * This means there are two ASCII nulls at the end
287 * of the first list.
288 *
289 * Find the end of the first list; that's the
290 * beginning of the second list.
291 */
292 desc = &AdaptersName[0];
293 while (*desc != '\0' || *(desc + 1) != '\0')
294 desc++;
295
296 /*
297 * Found it - "desc" points to the first of the two
298 * nulls at the end of the list of names, so the
299 * first byte of the list of descriptions is two bytes
300 * after it.
301 */
302 desc += 2;
303
304 /*
305 * Loop over the elements in the first list.
306 */
307 name = &AdaptersName[0];
308 while (*name != '\0') {
309 /*
310 * Add an entry for this interface.
311 */
312 if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
313 /*
314 * Failure.
315 */
316 ret = -1;
317 break;
318 }
319 name += strlen(name) + 1;
320 desc += strlen(desc) + 1;
321 }
322
323 if (ret != -1) {
324 /*
325 * We haven't had any errors yet; do any platform-specific
326 * operations to add devices.
327 */
328 if (pcap_platform_finddevs(&devlist, errbuf) < 0)
329 ret = -1;
330 }
331
332 if (ret == -1) {
333 /*
334 * We had an error; free the list we've been constructing.
335 */
336 if (devlist != NULL) {
337 pcap_freealldevs(devlist);
338 devlist = NULL;
339 }
340 }
341
342 *alldevsp = devlist;
343 free(AdaptersName);
344 return (ret);
345 }
346