Mercurial > dovecot > core-2.2
annotate src/lib/network.c @ 3373:690dcc51cdc1 HEAD
if using IPv6, bind both on the IPv4 and IPv6 addresses if IPV6_V6ONLY is
defined. Patch by Marco d'Itri
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Fri, 13 May 2005 16:35:19 +0300 |
parents | 8d15fea729c2 |
children | ddfa507bb74f |
rev | line source |
---|---|
1741
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Removed most of the license comments from src/lib/*.c. It's just fine to
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1 /* Copyright (c) 1999-2003 Timo Sirainen */ |
0 | 2 |
3 #include "lib.h" | |
4 #include "network.h" | |
5 | |
6 #include <unistd.h> | |
7 #include <fcntl.h> | |
8 #include <ctype.h> | |
9 #include <sys/un.h> | |
10 #include <netinet/tcp.h> | |
11 | |
12 union sockaddr_union { | |
13 struct sockaddr sa; | |
14 struct sockaddr_in sin; | |
15 #ifdef HAVE_IPV6 | |
16 struct sockaddr_in6 sin6; | |
17 #endif | |
18 }; | |
19 | |
20 #ifdef HAVE_IPV6 | |
21 # define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \ | |
22 sizeof(so.sin6) : sizeof(so.sin)) | |
23 #else | |
24 # define SIZEOF_SOCKADDR(so) (sizeof(so.sin)) | |
25 #endif | |
26 | |
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27 int net_ip_compare(const struct ip_addr *ip1, const struct ip_addr *ip2) |
0 | 28 { |
29 if (ip1->family != ip2->family) | |
30 return 0; | |
31 | |
32 #ifdef HAVE_IPV6 | |
33 if (ip1->family == AF_INET6) | |
34 return memcmp(&ip1->ip, &ip2->ip, sizeof(ip1->ip)) == 0; | |
35 #endif | |
36 | |
37 return memcmp(&ip1->ip, &ip2->ip, 4) == 0; | |
38 } | |
39 | |
40 | |
41 /* copy IP to sockaddr */ | |
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42 static inline void |
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43 sin_set_ip(union sockaddr_union *so, const struct ip_addr *ip) |
0 | 44 { |
45 if (ip == NULL) { | |
46 #ifdef HAVE_IPV6 | |
47 so->sin6.sin6_family = AF_INET6; | |
48 so->sin6.sin6_addr = in6addr_any; | |
49 #else | |
50 so->sin.sin_family = AF_INET; | |
51 so->sin.sin_addr.s_addr = INADDR_ANY; | |
52 #endif | |
53 return; | |
54 } | |
55 | |
56 so->sin.sin_family = ip->family; | |
57 #ifdef HAVE_IPV6 | |
58 if (ip->family == AF_INET6) | |
59 memcpy(&so->sin6.sin6_addr, &ip->ip, sizeof(ip->ip)); | |
60 else | |
61 #endif | |
62 memcpy(&so->sin.sin_addr, &ip->ip, 4); | |
63 } | |
64 | |
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65 static inline void |
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66 sin_get_ip(const union sockaddr_union *so, struct ip_addr *ip) |
0 | 67 { |
68 ip->family = so->sin.sin_family; | |
69 | |
70 #ifdef HAVE_IPV6 | |
71 if (ip->family == AF_INET6) | |
72 memcpy(&ip->ip, &so->sin6.sin6_addr, sizeof(ip->ip)); | |
73 else | |
74 #endif | |
75 memcpy(&ip->ip, &so->sin.sin_addr, 4); | |
76 } | |
77 | |
349 | 78 static inline void sin_set_port(union sockaddr_union *so, unsigned int port) |
0 | 79 { |
80 #ifdef HAVE_IPV6 | |
81 if (so->sin.sin_family == AF_INET6) | |
82 so->sin6.sin6_port = htons((unsigned short) port); | |
83 else | |
84 #endif | |
85 so->sin.sin_port = htons((unsigned short) port); | |
86 } | |
87 | |
349 | 88 static inline unsigned int sin_get_port(union sockaddr_union *so) |
0 | 89 { |
90 #ifdef HAVE_IPV6 | |
91 if (so->sin.sin_family == AF_INET6) | |
92 return ntohs(so->sin6.sin6_port); | |
93 #endif | |
94 return ntohs(so->sin.sin_port); | |
95 } | |
96 | |
97 static inline void close_save_errno(int fd) | |
98 { | |
99 int old_errno = errno; | |
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100 (void)close(fd); |
0 | 101 errno = old_errno; |
102 } | |
103 | |
104 /* Connect to socket with ip address */ | |
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105 int net_connect_ip(const struct ip_addr *ip, unsigned int port, |
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106 const struct ip_addr *my_ip) |
0 | 107 { |
108 union sockaddr_union so; | |
109 int fd, ret, opt = 1; | |
110 | |
111 if (my_ip != NULL && ip->family != my_ip->family) { | |
112 i_warning("net_connect_ip(): ip->family != my_ip->family"); | |
113 my_ip = NULL; | |
114 } | |
115 | |
116 /* create the socket */ | |
117 memset(&so, 0, sizeof(so)); | |
118 so.sin.sin_family = ip->family; | |
119 fd = socket(ip->family, SOCK_STREAM, 0); | |
120 | |
121 if (fd == -1) | |
122 return -1; | |
123 | |
124 /* set socket options */ | |
125 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); | |
126 setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); | |
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127 net_set_nonblock(fd, TRUE); |
0 | 128 |
129 /* set our own address */ | |
130 if (my_ip != NULL) { | |
131 sin_set_ip(&so, my_ip); | |
132 if (bind(fd, &so.sa, SIZEOF_SOCKADDR(so)) == -1) { | |
133 /* failed, set it back to INADDR_ANY */ | |
134 sin_set_ip(&so, NULL); | |
135 bind(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
136 } | |
137 } | |
138 | |
139 /* connect */ | |
140 sin_set_ip(&so, ip); | |
141 sin_set_port(&so, port); | |
142 ret = connect(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
143 | |
144 #ifndef WIN32 | |
145 if (ret < 0 && errno != EINPROGRESS) | |
146 #else | |
147 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK) | |
148 #endif | |
149 { | |
150 close_save_errno(fd); | |
151 return -1; | |
152 } | |
153 | |
154 return fd; | |
155 } | |
156 | |
157 int net_connect_unix(const char *path) | |
158 { | |
159 struct sockaddr_un sa; | |
160 int fd, ret; | |
161 | |
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162 memset(&sa, 0, sizeof(sa)); |
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163 sa.sun_family = AF_UNIX; |
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164 if (strocpy(sa.sun_path, path, sizeof(sa.sun_path)) < 0) { |
0 | 165 /* too long path */ |
166 errno = EINVAL; | |
167 return -1; | |
168 } | |
169 | |
170 /* create the socket */ | |
171 fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
172 if (fd == -1) | |
173 return -1; | |
174 | |
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Use nonblocking connecting for unix sockets.
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175 net_set_nonblock(fd, TRUE); |
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Use nonblocking connecting for unix sockets.
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176 |
0 | 177 /* connect */ |
178 ret = connect(fd, (struct sockaddr *) &sa, sizeof(sa)); | |
179 if (ret < 0 && errno != EINPROGRESS) { | |
180 close_save_errno(fd); | |
181 return -1; | |
182 } | |
183 | |
184 return fd; | |
185 } | |
186 | |
187 /* Disconnect socket */ | |
188 void net_disconnect(int fd) | |
189 { | |
388
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190 if (close(fd) < 0) |
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191 i_error("net_disconnect() failed: %m"); |
0 | 192 } |
193 | |
194 /* Set socket blocking/nonblocking */ | |
34
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195 void net_set_nonblock(int fd __attr_unused__, int nonblock __attr_unused__) |
0 | 196 { |
197 #ifdef HAVE_FCNTL | |
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198 int flags; |
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199 |
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200 flags = fcntl(fd, F_GETFL, 0); |
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201 if (flags == -1) |
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202 i_fatal("net_set_nonblock() failed: %m"); |
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203 |
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204 if (nonblock) |
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205 flags |= O_NONBLOCK; |
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206 else |
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207 flags &= ~O_NONBLOCK; |
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208 |
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209 if (fcntl(fd, F_SETFL, flags) < 0) |
628 | 210 i_fatal("net_set_nonblock() failed: %m"); |
0 | 211 #endif |
212 } | |
213 | |
410
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214 int net_set_cork(int fd __attr_unused__, int cork __attr_unused__) |
0 | 215 { |
216 #ifdef TCP_CORK | |
410
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217 return setsockopt(fd, SOL_TCP, TCP_CORK, &cork, sizeof(cork)); |
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218 #else |
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219 errno = ENOPROTOOPT; |
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220 return -1; |
0 | 221 #endif |
222 } | |
223 | |
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224 void net_get_ip_any4(struct ip_addr *ip) |
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225 { |
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226 struct in_addr *in_ip = (struct in_addr *) &ip->ip; |
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227 |
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228 ip->family = AF_INET; |
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229 in_ip->s_addr = INADDR_ANY; |
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230 } |
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231 |
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232 void net_get_ip_any6(struct ip_addr *ip) |
780
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233 { |
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234 #ifdef HAVE_IPV6 |
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235 ip->family = AF_INET6; |
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236 ip->ip = in6addr_any; |
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237 #else |
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238 memset(ip, 0, sizeof(struct ip_addr)); |
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239 #endif |
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240 } |
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241 |
0 | 242 /* Listen for connections on a socket. if `my_ip' is NULL, listen in any |
243 address. */ | |
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244 int net_listen(const struct ip_addr *my_ip, unsigned int *port, int backlog) |
0 | 245 { |
246 union sockaddr_union so; | |
247 int ret, fd, opt = 1; | |
248 socklen_t len; | |
249 | |
250 i_assert(port != NULL); | |
251 | |
252 memset(&so, 0, sizeof(so)); | |
253 sin_set_port(&so, *port); | |
254 sin_set_ip(&so, my_ip); | |
255 | |
256 /* create the socket */ | |
257 fd = socket(so.sin.sin_family, SOCK_STREAM, 0); | |
258 #ifdef HAVE_IPV6 | |
259 if (fd == -1 && (errno == EINVAL || errno == EAFNOSUPPORT)) { | |
260 /* IPv6 is not supported by OS */ | |
261 so.sin.sin_family = AF_INET; | |
262 so.sin.sin_addr.s_addr = INADDR_ANY; | |
263 | |
264 fd = socket(AF_INET, SOCK_STREAM, 0); | |
265 } | |
266 #endif | |
267 if (fd == -1) | |
268 return -1; | |
269 | |
270 /* set socket options */ | |
271 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); | |
272 setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); | |
273 | |
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274 /* if using IPv6, bind both on the IPv4 and IPv6 addresses */ |
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275 #ifdef IPV6_V6ONLY |
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276 if (so.sin.sin_family == AF_INET6) { |
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277 opt = 0; |
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278 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt)); |
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279 } |
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280 #endif |
0 | 281 /* specify the address/port we want to listen in */ |
282 ret = bind(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
283 if (ret >= 0) { | |
284 /* get the actual port we started listen */ | |
285 len = SIZEOF_SOCKADDR(so); | |
286 ret = getsockname(fd, &so.sa, &len); | |
287 if (ret >= 0) { | |
288 *port = sin_get_port(&so); | |
289 | |
290 /* start listening */ | |
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291 if (listen(fd, backlog) >= 0) |
0 | 292 return fd; |
293 } | |
294 | |
295 } | |
296 | |
297 /* error */ | |
298 close_save_errno(fd); | |
299 return -1; | |
300 } | |
301 | |
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302 int net_listen_unix(const char *path, int backlog) |
0 | 303 { |
304 struct sockaddr_un sa; | |
305 int fd; | |
306 | |
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307 memset(&sa, 0, sizeof(sa)); |
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308 sa.sun_family = AF_UNIX; |
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309 if (strocpy(sa.sun_path, path, sizeof(sa.sun_path)) < 0) { |
0 | 310 /* too long path */ |
311 errno = EINVAL; | |
312 return -1; | |
313 } | |
314 | |
315 /* create the socket */ | |
316 fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
317 if (fd == -1) | |
318 return -1; | |
319 | |
320 /* bind */ | |
321 if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == 0) { | |
322 /* start listening */ | |
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323 if (listen(fd, backlog) == 0) |
0 | 324 return fd; |
325 } | |
326 | |
327 close_save_errno(fd); | |
328 return -1; | |
329 } | |
330 | |
331 /* Accept a connection on a socket */ | |
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332 int net_accept(int fd, struct ip_addr *addr, unsigned int *port) |
0 | 333 { |
334 union sockaddr_union so; | |
335 int ret; | |
336 socklen_t addrlen; | |
337 | |
338 i_assert(fd >= 0); | |
339 | |
340 addrlen = sizeof(so); | |
341 ret = accept(fd, &so.sa, &addrlen); | |
342 | |
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343 if (ret < 0) { |
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344 if (errno == EBADF || errno == ENOTSOCK || |
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345 errno == EOPNOTSUPP || errno == EFAULT || errno == EINVAL) |
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346 return -2; |
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347 else |
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348 return -1; |
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349 } |
0 | 350 |
351 if (addr != NULL) sin_get_ip(&so, addr); | |
352 if (port != NULL) *port = sin_get_port(&so); | |
353 | |
354 return ret; | |
355 } | |
356 | |
357 /* Read data from socket, return number of bytes read, -1 = error */ | |
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358 ssize_t net_receive(int fd, void *buf, size_t len) |
0 | 359 { |
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360 ssize_t ret; |
0 | 361 |
362 i_assert(fd >= 0); | |
363 i_assert(buf != NULL); | |
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364 i_assert(len <= SSIZE_T_MAX); |
0 | 365 |
366 ret = recv(fd, buf, len, 0); | |
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367 if (ret == 0) { |
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368 /* disconnected */ |
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369 errno = 0; |
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370 return -2; |
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371 } |
0 | 372 |
781
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373 if (ret < 0) { |
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374 if (errno == EINTR || errno == EAGAIN) |
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375 return 0; |
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376 |
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377 if (errno == ECONNRESET || errno == ETIMEDOUT) { |
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378 /* treat as disconnection */ |
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379 return -2; |
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380 } |
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381 } |
0 | 382 |
383 return ret; | |
384 } | |
385 | |
386 /* Transmit data, return number of bytes sent, -1 = error */ | |
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387 ssize_t net_transmit(int fd, const void *data, size_t len) |
0 | 388 { |
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389 ssize_t ret; |
0 | 390 |
391 i_assert(fd >= 0); | |
392 i_assert(data != NULL); | |
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393 i_assert(len <= SSIZE_T_MAX); |
0 | 394 |
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395 ret = send(fd, data, len, 0); |
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396 if (ret == -1 && (errno == EINTR || errno == EAGAIN)) |
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397 return 0; |
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398 |
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399 if (errno == EPIPE) |
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400 return -2; |
0 | 401 |
402 return ret; | |
403 } | |
404 | |
405 /* Get IP addresses for host. ips contains ips_count of IPs, they don't need | |
406 to be free'd. Returns 0 = ok, others = error code for net_gethosterror() */ | |
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407 int net_gethostbyname(const char *addr, struct ip_addr **ips, int *ips_count) |
0 | 408 { |
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409 /* @UNSAFE */ |
0 | 410 #ifdef HAVE_IPV6 |
411 union sockaddr_union *so; | |
412 struct addrinfo hints, *ai, *origai; | |
413 char hbuf[NI_MAXHOST]; | |
414 int host_error; | |
415 #else | |
416 struct hostent *hp; | |
417 #endif | |
418 int count; | |
419 | |
420 i_assert(addr != NULL); | |
421 i_assert(ips != NULL); | |
422 i_assert(ips_count != NULL); | |
423 | |
424 *ips = NULL; | |
425 *ips_count = 0; | |
426 | |
427 #ifdef HAVE_IPV6 | |
428 memset(&hints, 0, sizeof(struct addrinfo)); | |
429 hints.ai_socktype = SOCK_STREAM; | |
430 | |
431 /* save error to host_error for later use */ | |
432 host_error = getaddrinfo(addr, NULL, &hints, &ai); | |
433 if (host_error != 0) | |
434 return host_error; | |
435 | |
436 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, | |
437 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) | |
438 return 1; | |
439 | |
440 | |
441 /* get number of IPs */ | |
442 origai = ai; | |
443 for (count = 0; ai != NULL; ai = ai->ai_next) | |
444 count++; | |
445 | |
446 *ips_count = count; | |
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447 *ips = t_malloc(sizeof(struct ip_addr) * count); |
0 | 448 |
449 count = 0; | |
450 for (ai = origai; ai != NULL; ai = ai->ai_next, count++) { | |
451 so = (union sockaddr_union *) ai->ai_addr; | |
452 | |
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453 sin_get_ip(so, &(*ips)[count]); |
0 | 454 } |
455 freeaddrinfo(origai); | |
456 #else | |
457 hp = gethostbyname(addr); | |
458 if (hp == NULL) | |
459 return h_errno; | |
460 | |
461 /* get number of IPs */ | |
462 count = 0; | |
463 while (hp->h_addr_list[count] != NULL) | |
464 count++; | |
465 | |
466 *ips_count = count; | |
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467 *ips = t_malloc(sizeof(struct ip_addr) * count); |
0 | 468 |
469 while (count > 0) { | |
470 count--; | |
471 | |
472 (*ips)[count].family = AF_INET; | |
473 memcpy(&(*ips)[count].ip, hp->h_addr_list[count], 4); | |
474 } | |
475 #endif | |
476 | |
477 return 0; | |
478 } | |
479 | |
480 /* Get socket address/port */ | |
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481 int net_getsockname(int fd, struct ip_addr *addr, unsigned int *port) |
0 | 482 { |
483 union sockaddr_union so; | |
484 socklen_t addrlen; | |
485 | |
486 i_assert(fd >= 0); | |
487 | |
488 addrlen = sizeof(so); | |
489 if (getsockname(fd, (struct sockaddr *) &so, &addrlen) == -1) | |
490 return -1; | |
491 | |
492 if (addr != NULL) sin_get_ip(&so, addr); | |
493 if (port != NULL) *port = sin_get_port(&so); | |
494 | |
495 return 0; | |
496 } | |
497 | |
2098 | 498 int net_getpeername(int fd, struct ip_addr *addr, unsigned int *port) |
499 { | |
500 union sockaddr_union so; | |
501 socklen_t addrlen; | |
502 | |
503 i_assert(fd >= 0); | |
504 | |
505 addrlen = sizeof(so); | |
506 if (getpeername(fd, (struct sockaddr *) &so, &addrlen) == -1) | |
507 return -1; | |
508 | |
509 if (addr != NULL) sin_get_ip(&so, addr); | |
510 if (port != NULL) *port = sin_get_port(&so); | |
511 | |
512 return 0; | |
513 } | |
514 | |
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515 const char *net_ip2addr(const struct ip_addr *ip) |
0 | 516 { |
517 #ifdef HAVE_IPV6 | |
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518 char addr[MAX_IP_LEN+1]; |
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519 |
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520 addr[MAX_IP_LEN] = '\0'; |
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521 if (inet_ntop(ip->family, &ip->ip, addr, MAX_IP_LEN) == NULL) |
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522 return NULL; |
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523 |
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524 return t_strdup(addr); |
0 | 525 #else |
526 unsigned long ip4; | |
527 | |
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528 if (ip->family != AF_INET) |
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529 return NULL; |
0 | 530 |
531 ip4 = ntohl(ip->ip.s_addr); | |
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532 return t_strdup_printf("%lu.%lu.%lu.%lu", |
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533 (ip4 & 0xff000000UL) >> 24, |
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534 (ip4 & 0x00ff0000) >> 16, |
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535 (ip4 & 0x0000ff00) >> 8, |
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536 (ip4 & 0x000000ff)); |
0 | 537 #endif |
538 } | |
539 | |
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540 int net_addr2ip(const char *addr, struct ip_addr *ip) |
0 | 541 { |
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542 if (strchr(addr, ':') != NULL) { |
0 | 543 /* IPv6 */ |
544 ip->family = AF_INET6; | |
545 #ifdef HAVE_IPV6 | |
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546 if (inet_pton(AF_INET6, addr, &ip->ip) == 0) |
0 | 547 return -1; |
548 #else | |
549 ip->ip.s_addr = 0; | |
550 #endif | |
551 } else { | |
552 /* IPv4 */ | |
553 ip->family = AF_INET; | |
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554 if (inet_aton(addr, (struct in_addr *) &ip->ip) == 0) |
0 | 555 return -1; |
556 } | |
557 | |
558 return 0; | |
559 } | |
560 | |
561 /* Get socket error */ | |
562 int net_geterror(int fd) | |
563 { | |
564 int data; | |
565 socklen_t len = sizeof(data); | |
566 | |
567 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &data, &len) == -1) | |
568 return -1; | |
569 | |
570 return data; | |
571 } | |
572 | |
573 /* get error of net_gethostname() */ | |
574 const char *net_gethosterror(int error) | |
575 { | |
576 #ifdef HAVE_IPV6 | |
577 i_assert(error != 0); | |
578 | |
579 if (error == 1) { | |
580 /* getnameinfo() failed */ | |
581 return strerror(errno); | |
582 } | |
583 | |
584 return gai_strerror(error); | |
585 #else | |
586 switch (error) { | |
587 case HOST_NOT_FOUND: | |
588 return "Host not found"; | |
589 case NO_ADDRESS: | |
590 return "No IP address found for name"; | |
591 case NO_RECOVERY: | |
592 return "A non-recovable name server error occurred"; | |
593 case TRY_AGAIN: | |
594 return "A temporary error on an authoritative name server"; | |
595 } | |
596 | |
597 /* unknown error */ | |
598 return NULL; | |
599 #endif | |
600 } | |
601 | |
602 /* return TRUE if host lookup failed because it didn't exist (ie. not | |
603 some error with name server) */ | |
604 int net_hosterror_notfound(int error) | |
605 { | |
606 #ifdef HAVE_IPV6 | |
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607 #ifdef EAI_NODATA /* NODATA is depricated */ |
0 | 608 return error != 1 && (error == EAI_NONAME || error == EAI_NODATA); |
609 #else | |
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610 return error != 1 && (error == EAI_NONAME); |
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611 #endif |
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612 #else |
0 | 613 return error == HOST_NOT_FOUND || error == NO_ADDRESS; |
614 #endif | |
615 } | |
616 | |
617 /* Get name of TCP service */ | |
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618 const char *net_getservbyport(unsigned short port) |
0 | 619 { |
620 struct servent *entry; | |
621 | |
349 | 622 entry = getservbyport(htons(port), "tcp"); |
0 | 623 return entry == NULL ? NULL : entry->s_name; |
624 } | |
625 | |
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626 int is_ipv4_address(const char *addr) |
0 | 627 { |
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628 while (*addr != '\0') { |
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629 if (*addr != '.' && !i_isdigit(*addr)) |
0 | 630 return 0; |
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631 addr++; |
0 | 632 } |
633 | |
634 return 1; | |
635 } | |
636 | |
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637 int is_ipv6_address(const char *addr) |
0 | 638 { |
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639 while (*addr != '\0') { |
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640 if (*addr != ':' && !i_isxdigit(*addr)) |
0 | 641 return 0; |
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642 addr++; |
0 | 643 } |
644 | |
645 return 1; | |
646 } |