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/* X-Chat
* Copyright (C) 2001 Peter Zelezny.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* ipv4 and ipv6 networking functions with a common interface */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <glib.h>
#ifdef WIN32
#include "../../config-win32.h" /* grab USE_IPV6 and LOOKUPD defines */
#else
#include <unistd.h>
#include "../../config.h"
#endif
#define WANTSOCKET
#define WANTARPA
#define WANTDNS
#include "inet.h"
#define NETWORK_PRIVATE
#include "network.h"
#define RAND_INT(n) ((int)(rand() / (RAND_MAX + 1.0) * (n)))
/* ================== COMMON ================= */
static void
net_set_socket_options (int sok)
{
socklen_t sw;
sw = 1;
setsockopt (sok, SOL_SOCKET, SO_REUSEADDR, (char *) &sw, sizeof (sw));
sw = 1;
setsockopt (sok, SOL_SOCKET, SO_KEEPALIVE, (char *) &sw, sizeof (sw));
}
char *
net_ip (guint32 addr)
{
struct in_addr ia;
ia.s_addr = htonl (addr);
return inet_ntoa (ia);
}
void
net_store_destroy (netstore * ns)
{
#ifdef USE_IPV6
if (ns->ip6_hostent)
freeaddrinfo (ns->ip6_hostent);
#endif
free (ns);
}
netstore *
net_store_new (void)
{
netstore *ns;
ns = malloc (sizeof (netstore));
memset (ns, 0, sizeof (netstore));
return ns;
}
#ifndef USE_IPV6
/* =================== IPV4 ================== */
/*
A note about net_resolve and lookupd:
Many IRC networks rely on round-robin DNS for load balancing, rotating the list
of IP address on each query. However, this method breaks when DNS queries are
cached. Mac OS X and Darwin handle DNS lookups through the lookupd daemon, which
caches queries in its default configuration: thus, if we always pick the first
address, we will be stuck with the same host (which might be down!) until the
TTL reaches 0 or lookupd is reset (typically, at reboot). Therefore, we need to
pick a random address from the result list, instead of always using the first.
*/
char *
net_resolve (netstore * ns, char *hostname, int port, char **real_host)
{
ns->ip4_hostent = gethostbyname (hostname);
if (!ns->ip4_hostent)
return NULL;
memset (&ns->addr, 0, sizeof (ns->addr));
#ifdef LOOKUPD
int count = 0;
while (ns->ip4_hostent->h_addr_list[count]) count++;
memcpy (&ns->addr.sin_addr,
ns->ip4_hostent->h_addr_list[RAND_INT(count)],
ns->ip4_hostent->h_length);
#else
memcpy (&ns->addr.sin_addr, ns->ip4_hostent->h_addr,
ns->ip4_hostent->h_length);
#endif
ns->addr.sin_port = htons (port);
ns->addr.sin_family = AF_INET;
*real_host = strdup (ns->ip4_hostent->h_name);
return strdup (inet_ntoa (ns->addr.sin_addr));
}
int
net_connect (netstore * ns, int sok4, int sok6, int *sok_return)
{
*sok_return = sok4;
return connect (sok4, (struct sockaddr *) &ns->addr, sizeof (ns->addr));
}
void
net_bind (netstore * tobindto, int sok4, int sok6)
{
bind (sok4, (struct sockaddr *) &tobindto->addr, sizeof (tobindto->addr));
}
void
net_sockets (int *sok4, int *sok6)
{
*sok4 = socket (AF_INET, SOCK_STREAM, 0);
*sok6 = -1;
net_set_socket_options (*sok4);
}
void
udp_sockets (int *sok4, int *sok6)
{
*sok4 = socket (AF_INET, SOCK_DGRAM, 0);
*sok6 = -1;
}
void
net_store_fill_any (netstore *ns)
{
ns->addr.sin_family = AF_INET;
ns->addr.sin_addr.s_addr = INADDR_ANY;
ns->addr.sin_port = 0;
}
void
net_store_fill_v4 (netstore *ns, guint32 addr, int port)
{
ns->addr.sin_family = AF_INET;
ns->addr.sin_addr.s_addr = addr;
ns->addr.sin_port = port;
}
guint32
net_getsockaddr_v4 (netstore *ns)
{
return ns->addr.sin_addr.s_addr;
}
int
net_getsockport (int sok4, int sok6)
{
struct sockaddr_in addr;
int len = sizeof (addr);
if (getsockname (sok4, (struct sockaddr *)&addr, &len) == -1)
return -1;
return addr.sin_port;
}
#else
/* =================== IPV6 ================== */
char *
net_resolve (netstore * ns, char *hostname, int port, char **real_host)
{
struct addrinfo hints;
char ipstring[MAX_HOSTNAME];
char portstring[MAX_HOSTNAME];
int ret;
/* if (ns->ip6_hostent)
freeaddrinfo (ns->ip6_hostent);*/
sprintf (portstring, "%d", port);
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_family = PF_UNSPEC; /* support ipv6 and ipv4 */
hints.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
hints.ai_socktype = SOCK_STREAM;
if (port == 0)
ret = getaddrinfo (hostname, NULL, &hints, &ns->ip6_hostent);
else
ret = getaddrinfo (hostname, portstring, &hints, &ns->ip6_hostent);
if (ret != 0)
return NULL;
#ifdef LOOKUPD /* See note about lookupd above the IPv4 version of net_resolve. */
struct addrinfo *tmp;
int count = 0;
for (tmp = ns->ip6_hostent; tmp; tmp = tmp->ai_next)
count ++;
count = RAND_INT(count);
while (count--) ns->ip6_hostent = ns->ip6_hostent->ai_next;
#endif
/* find the numeric IP number */
ipstring[0] = 0;
getnameinfo (ns->ip6_hostent->ai_addr, ns->ip6_hostent->ai_addrlen,
ipstring, sizeof (ipstring), NULL, 0, NI_NUMERICHOST);
if (ns->ip6_hostent->ai_canonname)
*real_host = strdup (ns->ip6_hostent->ai_canonname);
else
*real_host = strdup (hostname);
return strdup (ipstring);
}
/* the only thing making this interface unclean, this shitty sok4, sok6 business */
int
net_connect (netstore * ns, int sok4, int sok6, int *sok_return)
{
struct addrinfo *res, *res0;
int error = -1;
res0 = ns->ip6_hostent;
for (res = res0; res; res = res->ai_next)
{
/* sok = socket (res->ai_family, res->ai_socktype, res->ai_protocol);
if (sok < 0)
continue;*/
switch (res->ai_family)
{
case AF_INET:
error = connect (sok4, res->ai_addr, res->ai_addrlen);
*sok_return = sok4;
break;
case AF_INET6:
error = connect (sok6, res->ai_addr, res->ai_addrlen);
*sok_return = sok6;
break;
default:
error = 1;
}
if (error == 0)
break;
}
return error;
}
void
net_bind (netstore * tobindto, int sok4, int sok6)
{
bind (sok4, tobindto->ip6_hostent->ai_addr,
tobindto->ip6_hostent->ai_addrlen);
bind (sok6, tobindto->ip6_hostent->ai_addr,
tobindto->ip6_hostent->ai_addrlen);
}
void
net_sockets (int *sok4, int *sok6)
{
*sok4 = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
*sok6 = socket (AF_INET6, SOCK_STREAM, IPPROTO_TCP);
net_set_socket_options (*sok4);
net_set_socket_options (*sok6);
}
void
udp_sockets (int *sok4, int *sok6)
{
*sok4 = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
*sok6 = socket (AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
}
/* the following functions are used only by MSPROXY and are not
proper ipv6 implementations - do not use in new code! */
void
net_store_fill_any (netstore *ns)
{
struct addrinfo *ai;
struct sockaddr_in *sin;
ai = ns->ip6_hostent;
if (!ai) {
ai = malloc (sizeof (struct addrinfo));
memset (ai, 0, sizeof (struct addrinfo));
ns->ip6_hostent = ai;
}
sin = (struct sockaddr_in *)ai->ai_addr;
if (!sin) {
sin = malloc (sizeof (struct sockaddr_in));
memset (sin, 0, sizeof (struct sockaddr_in));
ai->ai_addr = (struct sockaddr *)sin;
}
ai->ai_family = AF_INET;
ai->ai_addrlen = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
sin->sin_port = 0;
ai->ai_next = NULL;
}
void
net_store_fill_v4 (netstore *ns, guint32 addr, int port)
{
struct addrinfo *ai;
struct sockaddr_in *sin;
ai = ns->ip6_hostent;
if (!ai) {
ai = malloc (sizeof (struct addrinfo));
memset (ai, 0, sizeof (struct addrinfo));
ns->ip6_hostent = ai;
}
sin = (struct sockaddr_in *)ai->ai_addr;
if (!sin) {
sin = malloc (sizeof (struct sockaddr_in));
memset (sin, 0, sizeof (struct sockaddr_in));
ai->ai_addr = (struct sockaddr *)sin;
}
ai->ai_family = AF_INET;
ai->ai_addrlen = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
sin->sin_port = port;
ai->ai_next = NULL;
}
guint32
net_getsockaddr_v4 (netstore *ns)
{
struct addrinfo *ai;
struct sockaddr_in *sin;
ai = ns->ip6_hostent;
while (ai->ai_family != AF_INET) {
ai = ai->ai_next;
if (!ai)
return 0;
}
sin = (struct sockaddr_in *)ai->ai_addr;
return sin->sin_addr.s_addr;
}
int
net_getsockport (int sok4, int sok6)
{
struct sockaddr_in addr;
int len = sizeof (addr);
if (getsockname (sok4, (struct sockaddr *)&addr, &len) == -1)
return -1;
return addr.sin_port;
}
#endif
|
