summaryrefslogtreecommitdiff
path: root/src/core/network.c
blob: 7c800ac1ca8f49bd83f7a0ce26dc9a9b3d3ad29c (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
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
/*
 network.c : Network stuff

    Copyright (C) 1999-2000 Timo Sirainen

    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "module.h"
#include "network.h"
#include "net-internal.h"

#ifndef INADDR_NONE
#define INADDR_NONE INADDR_BROADCAST
#endif

union sockaddr_union {
	struct sockaddr sa;
	struct sockaddr_in sin;
#ifdef HAVE_IPV6
	struct sockaddr_in6 sin6;
#endif
};

/* Cygwin need this, don't know others.. */
/*#define BLOCKING_SOCKETS 1*/

int net_ip_compare(IPADDR *ip1, IPADDR *ip2)
{
	if (ip1->family != ip2->family)
		return 0;

#ifdef HAVE_IPV6
	if (ip1->family == AF_INET6)
		return memcmp(&ip1->addr, &ip2->addr, sizeof(ip1->addr)) == 0;
#endif

	return memcmp(&ip1->addr, &ip2->addr, 4) == 0;
}


/* copy IP to sockaddr */
inline void sin_set_ip(union sockaddr_union *so, const IPADDR *ip)
{
	if (ip == NULL) {
#ifdef HAVE_IPV6
		so->sin6.sin6_family = AF_INET6;
		so->sin6.sin6_addr = in6addr_any;
#else
		so->sin.sin_family = AF_INET;
		so->sin.sin_addr.s_addr = INADDR_ANY;
#endif
		return;
	}

	so->sin.sin_family = ip->family;
#ifdef HAVE_IPV6
	if (ip->family == AF_INET6)
		memcpy(&so->sin6.sin6_addr, &ip->addr, sizeof(ip->addr.ip6));
	else
#endif
		memcpy(&so->sin.sin_addr, &ip->addr, 4);
}

inline void sin_get_ip(const union sockaddr_union *so, IPADDR *ip)
{
	ip->family = so->sin.sin_family;

#ifdef HAVE_IPV6
	if (ip->family == AF_INET6)
		memcpy(&ip->addr, &so->sin6.sin6_addr, sizeof(ip->addr.ip6));
	else
#endif
		memcpy(&ip->addr, &so->sin.sin_addr, 4);
}

G_INLINE_FUNC void sin_set_port(union sockaddr_union *so, int port)
{
#ifdef HAVE_IPV6
	if (so->sin.sin_family == AF_INET6)
                so->sin6.sin6_port = htons(port);
	else
#endif
		so->sin.sin_port = htons(port);
}

G_INLINE_FUNC int sin_get_port(union sockaddr_union *so)
{
#ifdef HAVE_IPV6
	if (so->sin.sin_family == AF_INET6)
		return ntohs(so->sin6.sin6_port);
#endif
	return ntohs(so->sin.sin_port);
}

/* Connect to socket */
int net_connect(const char *addr, int port, IPADDR *my_ip)
{
	IPADDR ip;

	g_return_val_if_fail(addr != NULL, -1);

	if (net_gethostbyname(addr, &ip) == -1)
		return -1;

	return net_connect_ip(&ip, port, my_ip);
}

/* Connect to socket with ip address */
int net_connect_ip(IPADDR *ip, int port, IPADDR *my_ip)
{
	union sockaddr_union so;
	int handle, ret, opt = 1;

	/* create the socket */
	memset(&so, 0, sizeof(so));
        so.sin.sin_family = ip->family;
	handle = socket(ip->family, SOCK_STREAM, 0);

	if (handle == -1)
		return -1;

	/* set socket options */
	fcntl(handle, F_SETFL, O_NONBLOCK);
	setsockopt(handle, SOL_SOCKET, SO_REUSEADDR,
		   (char *) &opt, sizeof(opt));
	setsockopt(handle, SOL_SOCKET, SO_KEEPALIVE,
		   (char *) &opt, sizeof(opt));

	/* set our own address, ignore if bind() fails */
	if (my_ip != NULL) {
		sin_set_ip(&so, my_ip);
		bind(handle, &so.sa, sizeof(so));
	}

	/* connect */
	sin_set_ip(&so, ip);
	sin_set_port(&so, port);
	ret = connect(handle, &so.sa, sizeof(so));

	if (ret < 0 && errno != EINPROGRESS) {
		close(handle);
		return -1;
	}

	return handle;
}

/* Disconnect socket */
void net_disconnect(int handle)
{
	g_return_if_fail(handle != -1);

	close(handle);
}

/* Listen for connections on a socket. if `my_ip' is NULL, listen in any
   address. */
int net_listen(IPADDR *my_ip, int *port)
{
	union sockaddr_union so;
	int ret, handle, opt = 1;
	socklen_t len = sizeof(so);

	g_return_val_if_fail(port != NULL, -1);

	memset(&so, 0, sizeof(so));
	sin_set_port(&so, *port);
	sin_set_ip(&so, my_ip);

	/* create the socket */
	handle = socket(so.sin.sin_family, SOCK_STREAM, 0);
	if (handle == -1)
		return -1;

	/* set socket options */
	fcntl(handle, F_SETFL, O_NONBLOCK);
	setsockopt(handle, SOL_SOCKET, SO_REUSEADDR,
		   (char *) &opt, sizeof(opt));
	setsockopt(handle, SOL_SOCKET, SO_KEEPALIVE,
		   (char *) &opt, sizeof(opt));

	/* specify the address/port we want to listen in */
	ret = bind(handle, &so.sa, sizeof(so));
	if (ret < 0) {
		close(handle);
		return -1;
	}

	/* get the actual port we started listen */
	ret = getsockname(handle, &so.sa, &len);
	if (ret < 0) {
		close(handle);
		return -1;
	}

	*port = sin_get_port(&so);

	/* start listening */
	if (listen(handle, 1) < 0) {
		close(handle);
		return -1;
	}

	return handle;
}

/* Accept a connection on a socket */
int net_accept(int handle, IPADDR *addr, int *port)
{
	union sockaddr_union so;
	int ret;
	socklen_t addrlen;

	g_return_val_if_fail(handle != -1, -1);

	addrlen = sizeof(so);
	ret = accept(handle, &so.sa, &addrlen);

	if (ret < 0)
		return -1;

	if (addr != NULL) sin_get_ip(&so, addr);
	if (port != NULL) *port = sin_get_port(&so);

	fcntl(ret, F_SETFL, O_NONBLOCK);
	return ret;
}

/* Read data from socket, return number of bytes read, -1 = error */
int net_receive(int handle, char *buf, int len)
{
#ifdef BLOCKING_SOCKETS
	fd_set set;
	struct timeval tv;
#endif
	int ret;

	g_return_val_if_fail(handle != -1, -1);
	g_return_val_if_fail(buf != NULL, -1);

#ifdef BLOCKING_SOCKETS
	FD_ZERO(&set);
	FD_SET(handle, &set);
	tv.tv_sec = 0;
	tv.tv_usec = 0;
	if (select(handle+1, &set, NULL, NULL, &tv) <= 0 ||
	    !FD_ISSET(handle, &set)) return 0;
#endif

	ret = recv(handle, buf, len, 0);
	if (ret == 0)
		return -1; /* disconnected */

	if (ret == -1 && (errno == EWOULDBLOCK || errno == EAGAIN ||
			  errno == EINTR))
		return 0; /* no bytes received */

	return ret;
}

/* Transmit data, return number of bytes sent, -1 = error */
int net_transmit(int handle, const char *data, int len)
{
	int n;

	g_return_val_if_fail(handle != -1, -1);
	g_return_val_if_fail(data != NULL, -1);

	n = send(handle, data, len, 0);
	if (n == -1 && (errno == EWOULDBLOCK || errno == EAGAIN ||
			errno == EINTR || errno == EPIPE))
		return 0;

	return n > 0 ? n : -1;
}

/* Get socket address/port */
int net_getsockname(int handle, IPADDR *addr, int *port)
{
	union sockaddr_union so;
#ifdef HAVE_IPV6
	socklen_t len = sizeof(so.sin6);
#else
	socklen_t len = sizeof(so.sin);
#endif

	g_return_val_if_fail(handle != -1, -1);
	g_return_val_if_fail(addr != NULL, -1);

#ifdef HAVE_IPV6
	if (getsockname(handle, &so.sin6, &len) == -1)
#else
	if (getsockname(handle, &so.sin, &len) == -1)
#endif
		return -1;

        sin_get_ip(&so, addr);
	if (port) *port = sin_get_port(&so);

	return 0;
}

/* Get IP address for host, returns 0 = ok,
   others = error code for net_gethosterror() */
int net_gethostbyname(const char *addr, IPADDR *ip)
{
#ifdef HAVE_IPV6
	union sockaddr_union *so;
	struct addrinfo req, *ai;
	char hbuf[NI_MAXHOST];
	int host_error;
#else
	struct hostent *hp;
#endif

	g_return_val_if_fail(addr != NULL, -1);

#ifdef HAVE_IPV6
	memset(ip, 0, sizeof(IPADDR));
	memset(&req, 0, sizeof(struct addrinfo));
	req.ai_socktype = SOCK_STREAM;

	/* save error to host_error for later use */
	host_error = getaddrinfo(addr, NULL, &req, &ai);
	if (host_error != 0)
		return host_error;

	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf,
			sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
		return 1;

	so = (union sockaddr_union *) ai->ai_addr;
        sin_get_ip(so, ip);
	freeaddrinfo(ai);
#else
	hp = gethostbyname(addr);
	if (hp == NULL) return h_errno;

	ip->family = AF_INET;
	memcpy(&ip->addr, hp->h_addr, 4);
#endif

	return 0;
}

/* Get name for host, *name should be g_free()'d unless it's NULL.
   Return values are the same as with net_gethostbyname() */
int net_gethostbyaddr(IPADDR *ip, char **name)
{
#ifdef HAVE_IPV6
	struct addrinfo req, *ai;
	char hbuf[NI_MAXHOST];
	int host_error;
#else
	struct hostent *hp;
#endif
	char ipname[MAX_IP_LEN];

	g_return_val_if_fail(ip != NULL, -1);
	g_return_val_if_fail(name != NULL, -1);

	net_ip2host(ip, ipname);

	*name = NULL;
#ifdef HAVE_IPV6
	memset(&req, 0, sizeof(struct addrinfo));
	req.ai_socktype = SOCK_STREAM;

	/* save error to host_error for later use */
	host_error = getaddrinfo(ipname, NULL, &req, &ai);
	if (host_error != 0)
		return host_error;

	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf,
			sizeof(hbuf), NULL, 0, 0))
		return 1;

	/*FIXME: how does this work? *name = g_strdup(ai->?);*/
	freeaddrinfo(ai);
	return 1;
#else
	hp = gethostbyaddr(ipname, strlen(ipname), AF_INET);
	if (hp == NULL) return -1;

	*name = g_strdup(hp->h_name);
#endif

	return 0;
}

int net_ip2host(IPADDR *ip, char *host)
{
#ifdef HAVE_IPV6
	if (!inet_ntop(ip->family, &ip->addr, host, MAX_IP_LEN))
		return -1;
#else
	unsigned long ip4;

	ip4 = ntohl(ip->addr.ip.s_addr);
	sprintf(host, "%lu.%lu.%lu.%lu",
		(ip4 & 0xff000000UL) >> 24,
		(ip4 & 0x00ff0000) >> 16,
		(ip4 & 0x0000ff00) >> 8,
		(ip4 & 0x000000ff));
#endif
	return 0;
}

int net_host2ip(const char *host, IPADDR *ip)
{
	unsigned long addr;

#ifdef HAVE_IPV6
	if (strchr(host, ':') != NULL) {
		/* IPv6 */
		ip->family = AF_INET6;
		if (inet_pton(AF_INET6, host, &ip->addr) == 0)
			return -1;
	} else
#endif
	{
		/* IPv4 */
		ip->family = AF_INET;
#ifdef HAVE_INET_ATON
		if (inet_aton(host, &ip->addr.ip.s_addr) == 0)
			return -1;
#else
		addr = inet_addr(host);
		if (addr == INADDR_NONE)
			return -1;

		memcpy(&ip->addr, &addr, 4);
#endif
	}

	return 0;
}

/* Get socket error */
int net_geterror(int handle)
{
	int data;
	socklen_t len = sizeof(data);

	if (getsockopt(handle, SOL_SOCKET, SO_ERROR, &data, &len) == -1)
		return -1;

	return data;
}

/* get error of net_gethostname() */
const char *net_gethosterror(int error)
{
#ifdef HAVE_IPV6
	g_return_val_if_fail(error != 0, NULL);

	if (error == 1) {
		/* getnameinfo() failed ..
		   FIXME: does strerror return the right error message? */
		return g_strerror(errno);
	}

	return gai_strerror(error);
#else
	switch (error) {
	case HOST_NOT_FOUND:
		return _("Host not found");
	case NO_ADDRESS:
		return _("No IP address found for name");
	case NO_RECOVERY:
		return _("A non-recovable name server error occurred");
	case TRY_AGAIN:
		return _("A temporary error on an authoritative name server");
	}

	/* unknown error */
	return NULL;
#endif
}

/* return TRUE if host lookup failed because it didn't exist (ie. not
   some error with name server) */
int net_hosterror_notfound(int error)
{
#ifdef HAVE_IPV6
	return error != 1 && (error == EAI_NONAME || error == EAI_NODATA);
#else
	return error == HOST_NOT_FOUND || error == NO_ADDRESS;
#endif
}

int is_ipv4_address(const char *host)
{
	while (*host != '\0') {
		if (*host != '.' && !isdigit(*host))
			return 0;
                host++;
	}

	return 1;
}

int is_ipv6_address(const char *host)
{
	while (*host != '\0') {
		if (*host != ':' && !isxdigit(*host))
			return 0;
                host++;
	}

	return 1;
}