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 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37
38 #include <pcap.h>
39 #include <pcap-int.h>
40 #include <Packet32.h>
41
42 #include <errno.h>
43
44 static int
pcap_add_if_win32(pcap_if_t ** devlist,char * name,const char * desc,char * errbuf)45 pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
46 char *errbuf)
47 {
48 pcap_if_t *curdev;
49 npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
50 LONG if_addr_size;
51 int res = 0;
52
53 if_addr_size = MAX_NETWORK_ADDRESSES;
54
55 /*
56 * Add an entry for this interface, with no addresses.
57 */
58 if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
59 /*
60 * Failure.
61 */
62 return (-1);
63 }
64
65 /*
66 * Get the list of addresses for the interface.
67 */
68 if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
69 /*
70 * Failure.
71 *
72 * We don't return an error, because this can happen with
73 * NdisWan interfaces, and we want to supply them even
74 * if we can't supply their addresses.
75 *
76 * We return an entry with an empty address list.
77 */
78 return (0);
79 }
80
81 /*
82 * Now add the addresses.
83 */
84 while (if_addr_size-- > 0) {
85 /*
86 * "curdev" is an entry for this interface; add an entry for
87 * this address to its list of addresses.
88 */
89 if(curdev == NULL)
90 break;
91 res = add_addr_to_dev(curdev,
92 (struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
93 sizeof (struct sockaddr_storage),
94 (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
95 sizeof (struct sockaddr_storage),
96 (struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
97 sizeof (struct sockaddr_storage),
98 NULL,
99 0,
100 errbuf);
101 if (res == -1) {
102 /*
103 * Failure.
104 */
105 break;
106 }
107 }
108
109 return (res);
110 }
111
112
113 /*
114 * Get a list of all interfaces that are up and that we can open.
115 * Returns -1 on error, 0 otherwise.
116 * The list, as returned through "alldevsp", may be null if no interfaces
117 * were up and could be opened.
118 *
119 * Win32 implementation, based on WinPcap
120 */
121 int
pcap_findalldevs_interfaces(pcap_if_t ** alldevsp,char * errbuf)122 pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
123 {
124 pcap_if_t *devlist = NULL;
125 int ret = 0;
126 const char *desc;
127 char *AdaptersName;
128 ULONG NameLength;
129 char *name;
130
131 /*
132 * Find out how big a buffer we need.
133 *
134 * This call should always return FALSE; if the error is
135 * ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
136 * the size of the buffer we need, otherwise there's a
137 * problem, and NameLength should be set to 0.
138 *
139 * It shouldn't require NameLength to be set, but,
140 * at least as of WinPcap 4.1.3, it checks whether
141 * NameLength is big enough before it checks for a
142 * NULL buffer argument, so, while it'll still do
143 * the right thing if NameLength is uninitialized and
144 * whatever junk happens to be there is big enough
145 * (because the pointer argument will be null), it's
146 * still reading an uninitialized variable.
147 */
148 NameLength = 0;
149 if (!PacketGetAdapterNames(NULL, &NameLength))
150 {
151 DWORD last_error = GetLastError();
152
153 if (last_error != ERROR_INSUFFICIENT_BUFFER)
154 {
155 snprintf(errbuf, PCAP_ERRBUF_SIZE,
156 "PacketGetAdapterNames: %s",
157 pcap_win32strerror());
158 return (-1);
159 }
160 }
161
162 if (NameLength > 0)
163 AdaptersName = (char*) malloc(NameLength);
164 else
165 {
166 *alldevsp = NULL;
167 return 0;
168 }
169 if (AdaptersName == NULL)
170 {
171 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
172 return (-1);
173 }
174
175 if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
176 snprintf(errbuf, PCAP_ERRBUF_SIZE,
177 "PacketGetAdapterNames: %s",
178 pcap_win32strerror());
179 free(AdaptersName);
180 return (-1);
181 }
182
183 /*
184 * "PacketGetAdapterNames()" returned a list of
185 * null-terminated ASCII interface name strings,
186 * terminated by a null string, followed by a list
187 * of null-terminated ASCII interface description
188 * strings, terminated by a null string.
189 * This means there are two ASCII nulls at the end
190 * of the first list.
191 *
192 * Find the end of the first list; that's the
193 * beginning of the second list.
194 */
195 desc = &AdaptersName[0];
196 while (*desc != '\0' || *(desc + 1) != '\0')
197 desc++;
198
199 /*
200 * Found it - "desc" points to the first of the two
201 * nulls at the end of the list of names, so the
202 * first byte of the list of descriptions is two bytes
203 * after it.
204 */
205 desc += 2;
206
207 /*
208 * Loop over the elements in the first list.
209 */
210 name = &AdaptersName[0];
211 while (*name != '\0') {
212 /*
213 * Add an entry for this interface.
214 */
215 if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
216 /*
217 * Failure.
218 */
219 ret = -1;
220 break;
221 }
222 name += strlen(name) + 1;
223 desc += strlen(desc) + 1;
224 }
225
226 if (ret != -1) {
227 /*
228 * We haven't had any errors yet; do any platform-specific
229 * operations to add devices.
230 */
231 if (pcap_platform_finddevs(&devlist, errbuf) < 0)
232 ret = -1;
233 }
234
235 if (ret == -1) {
236 /*
237 * We had an error; free the list we've been constructing.
238 */
239 if (devlist != NULL) {
240 pcap_freealldevs(devlist);
241 devlist = NULL;
242 }
243 }
244
245 *alldevsp = devlist;
246 free(AdaptersName);
247 return (ret);
248 }
249