summaryrefslogtreecommitdiff
path: root/source3/lib/replace/getifaddrs.c
blob: a4f16ddb76913a3d12986e358a163bf271f8a00b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1998
   Copyright (C) Jeremy Allison 2007
   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "system/network.h"

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#ifndef SIOCGIFCONF
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#endif

#ifdef HAVE_IFACE_GETIFADDRS
#define _FOUND_IFACE_ANY
#else

void freeifaddrs(struct ifaddrs *ifp)
{
	free(ifp->ifa_name);
	free(ifp->ifa_addr);
	free(ifp->ifa_netmask);
	free(ifp->ifa_dstaddr);
	if (ifp->ifa_next != NULL)
		freeifaddrs(ifp->ifa_next);
	free(ifp);
}

struct sockaddr *sockaddr_dup(struct sockaddr *sa)
{
	struct sockaddr *ret = calloc(1, sa->sa_len);
	if (ret == NULL)
		return NULL;
	memcpy(ret, sa, sa->sa_len);
	return ret;
}
#endif

#if HAVE_IFACE_IFCONF

/* this works for Linux 2.2, Solaris 2.5, SunOS4, HPUX 10.20, OSF1
   V4.0, Ultrix 4.4, SCO Unix 3.2, IRIX 6.4 and FreeBSD 3.2.

   It probably also works on any BSD style system.  */

int getifaddrs(struct ifaddrs **ifap)
{
	struct ifconf ifc;
	char buff[8192];
	int fd, i, n;
	struct ifreq *ifr=NULL;
	int total = 0;
	struct in_addr ipaddr;
	struct in_addr nmask;
	char *iname;
	struct ifaddrs *curif, *lastif;

	*ifap = NULL;

	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
		return -1;
	}
  
	ifc.ifc_len = sizeof(buff);
	ifc.ifc_buf = buff;

	if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
		close(fd);
		return -1;
	} 

	ifr = ifc.ifc_req;
  
	n = ifc.ifc_len / sizeof(struct ifreq);

	/* Loop through interfaces, looking for given IP address */
	for (i=n-1;i>=0 && total < max_interfaces;i--) {
		if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) {
			freeifaddrs(*ifap);
		}

		curif = calloc(1, sizeof(struct ifaddrs));
		if (lastif == NULL) {
			*ifap = curif;
		} else {
			lastif->ifa_next = (*ifap);
		}

		curif->ifa_name = strdup(ifr[i].ifr_name);
		curif->ifa_addr = sockaddr_dup(&ifr[i].ifr_addr);
		curif->ifa_dstaddr = NULL;
		curif->ifa_data = NULL;
		curif->ifa_next = NULL;
		curif->ifa_netmask = NULL;

		if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) != 0) {
			freeifaddrs(*ifap);
			return -1;
		}  

		curif->ifa_flags = ifr[i].ifr_flags;

		if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) {
			freeifaddrs(*ifap);
			return -1;
		}  

		curif->ifa_netmask = sockaddr_dup(&ifr[i].ifr_addr);

		lastif = curif;
	}

	close(fd);

	return 0;
}  

#define _FOUND_IFACE_ANY
#endif /* HAVE_IFACE_IFCONF */
#ifdef HAVE_IFACE_IFREQ

#ifndef I_STR
#include <sys/stropts.h>
#endif

/****************************************************************************
this should cover most of the streams based systems
Thanks to Andrej.Borsenkow@mow.siemens.ru for several ideas in this code
****************************************************************************/
int getifaddrs(struct ifaddrs **ifap)
{
	struct ifreq ifreq;
	struct strioctl strioctl;
	char buff[8192];
	int fd, i, n;
	struct ifreq *ifr=NULL;
	int total = 0;
	struct in_addr ipaddr;
	struct in_addr nmask;
	char *iname;
	struct ifaddrs *curif;

	*ifap = NULL;

	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
		return -1;
	}
  
	strioctl.ic_cmd = SIOCGIFCONF;
	strioctl.ic_dp  = buff;
	strioctl.ic_len = sizeof(buff);
	if (ioctl(fd, I_STR, &strioctl) < 0) {
		close(fd);
		return -1;
	} 

	/* we can ignore the possible sizeof(int) here as the resulting
	   number of interface structures won't change */
	n = strioctl.ic_len / sizeof(struct ifreq);

	/* we will assume that the kernel returns the length as an int
           at the start of the buffer if the offered size is a
           multiple of the structure size plus an int */
	if (n*sizeof(struct ifreq) + sizeof(int) == strioctl.ic_len) {
		ifr = (struct ifreq *)(buff + sizeof(int));  
	} else {
		ifr = (struct ifreq *)buff;  
	}

	/* Loop through interfaces */

	for (i = 0; i<n && total < max_interfaces; i++) {
		ifreq = ifr[i];
  
		curif = calloc(1, sizeof(struct ifaddrs));
		if (lastif == NULL) {
			*ifap = curif;
		} else {
			lastif->ifa_next = (*ifap);
		}

		strioctl.ic_cmd = SIOCGIFFLAGS;
		strioctl.ic_dp  = (char *)&ifreq;
		strioctl.ic_len = sizeof(struct ifreq);
		if (ioctl(fd, I_STR, &strioctl) != 0) {
			freeifaddrs(*ifap);
			return -1;
		}

		curif->ifa_flags = ifreq.ifr_flags;
		
		strioctl.ic_cmd = SIOCGIFADDR;
		strioctl.ic_dp  = (char *)&ifreq;
		strioctl.ic_len = sizeof(struct ifreq);
		if (ioctl(fd, I_STR, &strioctl) != 0) {
			freeifaddrs(*ifap);
			return -1;
		}

		curif->ifa_name = strdup(ifreq.ifr_name);
		curif->ifa_addr = sockaddr_dup(&ifreq.ifr_addr);
		curif->ifa_dstaddr = NULL;
		curif->ifa_data = NULL;
		curif->ifa_next = NULL;
		curif->ifa_netmask = NULL;

		strioctl.ic_cmd = SIOCGIFNETMASK;
		strioctl.ic_dp  = (char *)&ifreq;
		strioctl.ic_len = sizeof(struct ifreq);
		if (ioctl(fd, I_STR, &strioctl) != 0) {
			freeifaddrs(*ifap);
			return -1;
		}

		curif->ifa_netmask = sockaddr_dup(&ifreq.ifr_addr);

		lastif = curif;
	}

	close(fd);

	return 0;
}

#define _FOUND_IFACE_ANY
#endif /* HAVE_IFACE_IFREQ */
#ifdef HAVE_IFACE_AIX

/****************************************************************************
this one is for AIX (tested on 4.2)
****************************************************************************/
int getifaddrs(struct ifaddrs **ifap)
{
	char buff[8192];
	int fd, i;
	struct ifconf ifc;
	struct ifreq *ifr=NULL;
	struct in_addr ipaddr;
	struct in_addr nmask;
	char *iname;
	int total = 0;
	struct ifaddrs *curif, *lastif;

	*ifap = NULL;

	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
		return -1;
	}

	ifc.ifc_len = sizeof(buff);
	ifc.ifc_buf = buff;

	if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
		close(fd);
		return -1;
	}

	ifr = ifc.ifc_req;

	/* Loop through interfaces */
	i = ifc.ifc_len;

	while (i > 0) {
		uint_t inc;

		inc = ifr->ifr_addr.sa_len;

		if (ioctl(fd, SIOCGIFADDR, ifr) != 0) {
			freeaddrinfo(*ifap);
			return -1;
		}

		curif = calloc(1, sizeof(struct ifaddrs));
		if (lastif == NULL) {
			*ifap = curif;
		} else {
			lastif->ifa_next = (*ifap);
		}

		curif->ifa_name = strdup(ifr->ifr_name);
		curif->ifa_addr = sockaddr_dup(&ifr->ifr_addr);
		curif->ifa_dstaddr = NULL;
		curif->ifa_data = NULL;
		curif->ifa_netmask = NULL;
		curif->ifa_next = NULL;

		if (ioctl(fd, SIOCGIFFLAGS, ifr) != 0) {
			freeaddrinfo(*ifap);
			return -1;
		}

		curif->ifa_flags = ifr->ifr_flags;

		if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) {
			freeaddrinfo(*ifap);
			return -1;
		}

		curif->ifa_netmask = sockaddr_dup(&ifr->ifr_addr);

		lastif = curif;

	next:
		/*
		 * Patch from Archie Cobbs (archie@whistle.com).  The
		 * addresses in the SIOCGIFCONF interface list have a
		 * minimum size. Usually this doesn't matter, but if
		 * your machine has tunnel interfaces, etc. that have
		 * a zero length "link address", this does matter.  */

		if (inc < sizeof(ifr->ifr_addr))
			inc = sizeof(ifr->ifr_addr);
		inc += IFNAMSIZ;

		ifr = (struct ifreq*) (((char*) ifr) + inc);
		i -= inc;
	}

	close(fd);
	return 0;
}

#define _FOUND_IFACE_ANY
#endif /* HAVE_IFACE_AIX */
#ifndef _FOUND_IFACE_ANY
int getifaddrs(struct ifaddrs **ifap)
{
	errno = ENOSYS;
	return -1;
}
#endif

#ifdef AUTOCONF_TEST
/* this is the autoconf driver to test get_interfaces() */

 int main()
{
	struct ifaddrs *ifs;
	int total = get_interfaces(ifaces, MAX_INTERFACES);
	int i;

	int ret = getifaddrs(&ifs);
	if (ret != 0) {
		perror("getifaddrs() failed");
		return 1;
	}

	while (ifs) {
		printf("%-10s ", ifs->ifr_name);
		printf("IP=%s ", inet_ntoa(((struct sockaddr_in *)ifs->ifr_addr)->sin_addr));
		printf("NETMASK=%s\n", inet_ntoa(((struct sockaddr_in *)ifs->ifr_netmask)->sin_addr));
	}
	return 0;
}
#endif