Mercurial > dovecot > core-2.2
annotate src/lib/network.c @ 1485:8c28289a15a1 HEAD
s/host/addr/ in a few network functions
| author | Timo Sirainen <tss@iki.fi> |
|---|---|
| date | Sun, 18 May 2003 19:37:04 +0300 |
| parents | 0d9f0e617a1a |
| children | e291bf36d57f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 network.c : Network stuff with IPv6 support | |
| 3 | |
| 4 Copyright (c) 1999-2002 Timo Sirainen | |
| 5 | |
| 6 Permission is hereby granted, free of charge, to any person obtaining | |
| 7 a copy of this software and associated documentation files (the | |
| 8 "Software"), to deal in the Software without restriction, including | |
| 9 without limitation the rights to use, copy, modify, merge, publish, | |
| 10 distribute, sublicense, and/or sell copies of the Software, and to | |
| 11 permit persons to whom the Software is furnished to do so, subject to | |
| 12 the following conditions: | |
| 13 | |
| 14 The above copyright notice and this permission notice shall be | |
| 15 included in all copies or substantial portions of the Software. | |
| 16 | |
| 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| 18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| 20 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| 21 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| 22 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| 23 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| 24 */ | |
| 25 | |
| 26 #include "lib.h" | |
| 27 #include "network.h" | |
| 28 | |
| 29 #include <unistd.h> | |
| 30 #include <fcntl.h> | |
| 31 #include <ctype.h> | |
| 32 #include <sys/un.h> | |
| 33 #include <netinet/tcp.h> | |
| 34 | |
| 35 #define LISTEN_BACKLOG 8 | |
| 36 | |
| 37 union sockaddr_union { | |
| 38 struct sockaddr sa; | |
| 39 struct sockaddr_in sin; | |
| 40 #ifdef HAVE_IPV6 | |
| 41 struct sockaddr_in6 sin6; | |
| 42 #endif | |
| 43 }; | |
| 44 | |
| 45 #ifdef HAVE_IPV6 | |
| 46 # define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \ | |
| 47 sizeof(so.sin6) : sizeof(so.sin)) | |
| 48 #else | |
| 49 # define SIZEOF_SOCKADDR(so) (sizeof(so.sin)) | |
| 50 #endif | |
| 51 | |
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52 int net_ip_compare(const struct ip_addr *ip1, const struct ip_addr *ip2) |
| 0 | 53 { |
| 54 if (ip1->family != ip2->family) | |
| 55 return 0; | |
| 56 | |
| 57 #ifdef HAVE_IPV6 | |
| 58 if (ip1->family == AF_INET6) | |
| 59 return memcmp(&ip1->ip, &ip2->ip, sizeof(ip1->ip)) == 0; | |
| 60 #endif | |
| 61 | |
| 62 return memcmp(&ip1->ip, &ip2->ip, 4) == 0; | |
| 63 } | |
| 64 | |
| 65 | |
| 66 /* copy IP to sockaddr */ | |
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67 static inline void |
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68 sin_set_ip(union sockaddr_union *so, const struct ip_addr *ip) |
| 0 | 69 { |
| 70 if (ip == NULL) { | |
| 71 #ifdef HAVE_IPV6 | |
| 72 so->sin6.sin6_family = AF_INET6; | |
| 73 so->sin6.sin6_addr = in6addr_any; | |
| 74 #else | |
| 75 so->sin.sin_family = AF_INET; | |
| 76 so->sin.sin_addr.s_addr = INADDR_ANY; | |
| 77 #endif | |
| 78 return; | |
| 79 } | |
| 80 | |
| 81 so->sin.sin_family = ip->family; | |
| 82 #ifdef HAVE_IPV6 | |
| 83 if (ip->family == AF_INET6) | |
| 84 memcpy(&so->sin6.sin6_addr, &ip->ip, sizeof(ip->ip)); | |
| 85 else | |
| 86 #endif | |
| 87 memcpy(&so->sin.sin_addr, &ip->ip, 4); | |
| 88 } | |
| 89 | |
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90 static inline void |
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91 sin_get_ip(const union sockaddr_union *so, struct ip_addr *ip) |
| 0 | 92 { |
| 93 ip->family = so->sin.sin_family; | |
| 94 | |
| 95 #ifdef HAVE_IPV6 | |
| 96 if (ip->family == AF_INET6) | |
| 97 memcpy(&ip->ip, &so->sin6.sin6_addr, sizeof(ip->ip)); | |
| 98 else | |
| 99 #endif | |
| 100 memcpy(&ip->ip, &so->sin.sin_addr, 4); | |
| 101 } | |
| 102 | |
| 349 | 103 static inline void sin_set_port(union sockaddr_union *so, unsigned int port) |
| 0 | 104 { |
| 105 #ifdef HAVE_IPV6 | |
| 106 if (so->sin.sin_family == AF_INET6) | |
| 107 so->sin6.sin6_port = htons((unsigned short) port); | |
| 108 else | |
| 109 #endif | |
| 110 so->sin.sin_port = htons((unsigned short) port); | |
| 111 } | |
| 112 | |
| 349 | 113 static inline unsigned int sin_get_port(union sockaddr_union *so) |
| 0 | 114 { |
| 115 #ifdef HAVE_IPV6 | |
| 116 if (so->sin.sin_family == AF_INET6) | |
| 117 return ntohs(so->sin6.sin6_port); | |
| 118 #endif | |
| 119 return ntohs(so->sin.sin_port); | |
| 120 } | |
| 121 | |
| 122 static inline void close_save_errno(int fd) | |
| 123 { | |
| 124 int old_errno = errno; | |
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125 (void)close(fd); |
| 0 | 126 errno = old_errno; |
| 127 } | |
| 128 | |
| 129 /* Connect to socket with ip address */ | |
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130 int net_connect_ip(const struct ip_addr *ip, unsigned int port, |
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131 const struct ip_addr *my_ip) |
| 0 | 132 { |
| 133 union sockaddr_union so; | |
| 134 int fd, ret, opt = 1; | |
| 135 | |
| 136 if (my_ip != NULL && ip->family != my_ip->family) { | |
| 137 i_warning("net_connect_ip(): ip->family != my_ip->family"); | |
| 138 my_ip = NULL; | |
| 139 } | |
| 140 | |
| 141 /* create the socket */ | |
| 142 memset(&so, 0, sizeof(so)); | |
| 143 so.sin.sin_family = ip->family; | |
| 144 fd = socket(ip->family, SOCK_STREAM, 0); | |
| 145 | |
| 146 if (fd == -1) | |
| 147 return -1; | |
| 148 | |
| 149 /* set socket options */ | |
| 150 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); | |
| 151 setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); | |
| 152 | |
| 153 /* set our own address */ | |
| 154 if (my_ip != NULL) { | |
| 155 sin_set_ip(&so, my_ip); | |
| 156 if (bind(fd, &so.sa, SIZEOF_SOCKADDR(so)) == -1) { | |
| 157 /* failed, set it back to INADDR_ANY */ | |
| 158 sin_set_ip(&so, NULL); | |
| 159 bind(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 /* connect */ | |
| 164 sin_set_ip(&so, ip); | |
| 165 sin_set_port(&so, port); | |
| 166 ret = connect(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
| 167 | |
| 168 #ifndef WIN32 | |
| 169 if (ret < 0 && errno != EINPROGRESS) | |
| 170 #else | |
| 171 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK) | |
| 172 #endif | |
| 173 { | |
| 174 close_save_errno(fd); | |
| 175 return -1; | |
| 176 } | |
| 177 | |
| 178 return fd; | |
| 179 } | |
| 180 | |
| 181 int net_connect_unix(const char *path) | |
| 182 { | |
| 183 struct sockaddr_un sa; | |
| 184 int fd, ret; | |
| 185 | |
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186 memset(&sa, 0, sizeof(sa)); |
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187 sa.sun_family = AF_UNIX; |
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188 if (strocpy(sa.sun_path, path, sizeof(sa.sun_path)) < 0) { |
| 0 | 189 /* too long path */ |
| 190 errno = EINVAL; | |
| 191 return -1; | |
| 192 } | |
| 193 | |
| 194 /* create the socket */ | |
| 195 fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
| 196 if (fd == -1) | |
| 197 return -1; | |
| 198 | |
| 199 /* connect */ | |
| 200 ret = connect(fd, (struct sockaddr *) &sa, sizeof(sa)); | |
| 201 if (ret < 0 && errno != EINPROGRESS) { | |
| 202 close_save_errno(fd); | |
| 203 return -1; | |
| 204 } | |
| 205 | |
| 206 return fd; | |
| 207 } | |
| 208 | |
| 209 /* Disconnect socket */ | |
| 210 void net_disconnect(int fd) | |
| 211 { | |
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212 if (close(fd) < 0) |
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213 i_error("net_disconnect() failed: %m"); |
| 0 | 214 } |
| 215 | |
| 216 /* Set socket blocking/nonblocking */ | |
|
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217 void net_set_nonblock(int fd __attr_unused__, int nonblock __attr_unused__) |
| 0 | 218 { |
| 219 #ifdef HAVE_FCNTL | |
| 220 if (fcntl(fd, F_SETFL, nonblock ? O_NONBLOCK : 0) < 0) | |
| 628 | 221 i_fatal("net_set_nonblock() failed: %m"); |
| 0 | 222 #endif |
| 223 } | |
| 224 | |
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225 int net_set_cork(int fd __attr_unused__, int cork __attr_unused__) |
| 0 | 226 { |
| 227 #ifdef TCP_CORK | |
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228 return setsockopt(fd, SOL_TCP, TCP_CORK, &cork, sizeof(cork)); |
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229 #else |
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230 errno = ENOPROTOOPT; |
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231 return -1; |
| 0 | 232 #endif |
| 233 } | |
| 234 | |
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235 void net_get_ip_any4(struct ip_addr *ip) |
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236 { |
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237 struct in_addr *in_ip = (struct in_addr *) &ip->ip; |
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238 |
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239 ip->family = AF_INET; |
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240 in_ip->s_addr = INADDR_ANY; |
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241 } |
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242 |
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243 void net_get_ip_any6(struct ip_addr *ip) |
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244 { |
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245 #ifdef HAVE_IPV6 |
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246 ip->family = AF_INET6; |
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247 ip->ip = in6addr_any; |
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248 #else |
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249 memset(ip, 0, sizeof(struct ip_addr)); |
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250 #endif |
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251 } |
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252 |
| 0 | 253 /* Listen for connections on a socket. if `my_ip' is NULL, listen in any |
| 254 address. */ | |
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255 int net_listen(const struct ip_addr *my_ip, unsigned int *port) |
| 0 | 256 { |
| 257 union sockaddr_union so; | |
| 258 int ret, fd, opt = 1; | |
| 259 socklen_t len; | |
| 260 | |
| 261 i_assert(port != NULL); | |
| 262 | |
| 263 memset(&so, 0, sizeof(so)); | |
| 264 sin_set_port(&so, *port); | |
| 265 sin_set_ip(&so, my_ip); | |
| 266 | |
| 267 /* create the socket */ | |
| 268 fd = socket(so.sin.sin_family, SOCK_STREAM, 0); | |
| 269 #ifdef HAVE_IPV6 | |
| 270 if (fd == -1 && (errno == EINVAL || errno == EAFNOSUPPORT)) { | |
| 271 /* IPv6 is not supported by OS */ | |
| 272 so.sin.sin_family = AF_INET; | |
| 273 so.sin.sin_addr.s_addr = INADDR_ANY; | |
| 274 | |
| 275 fd = socket(AF_INET, SOCK_STREAM, 0); | |
| 276 } | |
| 277 #endif | |
| 278 if (fd == -1) | |
| 279 return -1; | |
| 280 | |
| 281 /* set socket options */ | |
| 282 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); | |
| 283 setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); | |
| 284 | |
| 285 /* specify the address/port we want to listen in */ | |
| 286 ret = bind(fd, &so.sa, SIZEOF_SOCKADDR(so)); | |
| 287 if (ret >= 0) { | |
| 288 /* get the actual port we started listen */ | |
| 289 len = SIZEOF_SOCKADDR(so); | |
| 290 ret = getsockname(fd, &so.sa, &len); | |
| 291 if (ret >= 0) { | |
| 292 *port = sin_get_port(&so); | |
| 293 | |
| 294 /* start listening */ | |
| 295 if (listen(fd, LISTEN_BACKLOG) >= 0) | |
| 296 return fd; | |
| 297 } | |
| 298 | |
| 299 } | |
| 300 | |
| 301 /* error */ | |
| 302 close_save_errno(fd); | |
| 303 return -1; | |
| 304 } | |
| 305 | |
| 306 int net_listen_unix(const char *path) | |
| 307 { | |
| 308 struct sockaddr_un sa; | |
| 309 int fd; | |
| 310 | |
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311 memset(&sa, 0, sizeof(sa)); |
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312 sa.sun_family = AF_UNIX; |
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313 if (strocpy(sa.sun_path, path, sizeof(sa.sun_path)) < 0) { |
| 0 | 314 /* too long path */ |
| 315 errno = EINVAL; | |
| 316 return -1; | |
| 317 } | |
| 318 | |
| 319 /* create the socket */ | |
| 320 fd = socket(PF_UNIX, SOCK_STREAM, 0); | |
| 321 if (fd == -1) | |
| 322 return -1; | |
| 323 | |
| 324 /* bind */ | |
| 325 if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == 0) { | |
| 326 /* start listening */ | |
| 327 if (listen(fd, LISTEN_BACKLOG) == 0) | |
| 328 return fd; | |
| 329 } | |
| 330 | |
| 331 close_save_errno(fd); | |
| 332 return -1; | |
| 333 } | |
| 334 | |
| 335 /* Accept a connection on a socket */ | |
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336 int net_accept(int fd, struct ip_addr *addr, unsigned int *port) |
| 0 | 337 { |
| 338 union sockaddr_union so; | |
| 339 int ret; | |
| 340 socklen_t addrlen; | |
| 341 | |
| 342 i_assert(fd >= 0); | |
| 343 | |
| 344 addrlen = sizeof(so); | |
| 345 ret = accept(fd, &so.sa, &addrlen); | |
| 346 | |
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347 if (ret < 0) { |
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348 if (errno == EBADF || errno == ENOTSOCK || |
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349 errno == EOPNOTSUPP || errno == EFAULT || errno == EINVAL) |
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350 return -2; |
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351 else |
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352 return -1; |
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353 } |
| 0 | 354 |
| 355 if (addr != NULL) sin_get_ip(&so, addr); | |
| 356 if (port != NULL) *port = sin_get_port(&so); | |
| 357 | |
| 358 return ret; | |
| 359 } | |
| 360 | |
| 361 /* Read data from socket, return number of bytes read, -1 = error */ | |
|
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362 ssize_t net_receive(int fd, void *buf, size_t len) |
| 0 | 363 { |
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364 ssize_t ret; |
| 0 | 365 |
| 366 i_assert(fd >= 0); | |
| 367 i_assert(buf != NULL); | |
|
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368 i_assert(len <= SSIZE_T_MAX); |
| 0 | 369 |
| 370 ret = recv(fd, buf, len, 0); | |
|
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371 if (ret == 0) { |
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372 /* disconnected */ |
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373 errno = 0; |
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374 return -2; |
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375 } |
| 0 | 376 |
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377 if (ret < 0) { |
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378 if (errno == EINTR || errno == EAGAIN) |
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379 return 0; |
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380 |
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381 if (errno == ECONNRESET || errno == ETIMEDOUT) { |
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382 /* treat as disconnection */ |
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383 return -2; |
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384 } |
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385 } |
| 0 | 386 |
| 387 return ret; | |
| 388 } | |
| 389 | |
| 390 /* Transmit data, return number of bytes sent, -1 = error */ | |
|
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391 ssize_t net_transmit(int fd, const void *data, size_t len) |
| 0 | 392 { |
|
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393 ssize_t ret; |
| 0 | 394 |
| 395 i_assert(fd >= 0); | |
| 396 i_assert(data != NULL); | |
|
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397 i_assert(len <= SSIZE_T_MAX); |
| 0 | 398 |
|
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399 ret = send(fd, data, len, 0); |
|
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400 if (ret == -1 && (errno == EINTR || errno == EAGAIN)) |
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401 return 0; |
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402 |
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403 if (errno == EPIPE) |
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404 return -2; |
| 0 | 405 |
| 406 return ret; | |
| 407 } | |
| 408 | |
| 409 /* Get IP addresses for host. ips contains ips_count of IPs, they don't need | |
| 410 to be free'd. Returns 0 = ok, others = error code for net_gethosterror() */ | |
|
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411 int net_gethostbyname(const char *addr, struct ip_addr **ips, int *ips_count) |
| 0 | 412 { |
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413 /* @UNSAFE */ |
| 0 | 414 #ifdef HAVE_IPV6 |
| 415 union sockaddr_union *so; | |
| 416 struct addrinfo hints, *ai, *origai; | |
| 417 char hbuf[NI_MAXHOST]; | |
| 418 int host_error; | |
| 419 #else | |
| 420 struct hostent *hp; | |
| 421 #endif | |
| 422 int count; | |
| 423 | |
| 424 i_assert(addr != NULL); | |
| 425 i_assert(ips != NULL); | |
| 426 i_assert(ips_count != NULL); | |
| 427 | |
| 428 *ips = NULL; | |
| 429 *ips_count = 0; | |
| 430 | |
| 431 #ifdef HAVE_IPV6 | |
| 432 memset(&hints, 0, sizeof(struct addrinfo)); | |
| 433 hints.ai_socktype = SOCK_STREAM; | |
| 434 | |
| 435 /* save error to host_error for later use */ | |
| 436 host_error = getaddrinfo(addr, NULL, &hints, &ai); | |
| 437 if (host_error != 0) | |
| 438 return host_error; | |
| 439 | |
| 440 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, | |
| 441 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) | |
| 442 return 1; | |
| 443 | |
| 444 | |
| 445 /* get number of IPs */ | |
| 446 origai = ai; | |
| 447 for (count = 0; ai != NULL; ai = ai->ai_next) | |
| 448 count++; | |
| 449 | |
| 450 *ips_count = count; | |
|
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451 *ips = t_malloc(sizeof(struct ip_addr) * count); |
| 0 | 452 |
| 453 count = 0; | |
| 454 for (ai = origai; ai != NULL; ai = ai->ai_next, count++) { | |
| 455 so = (union sockaddr_union *) ai->ai_addr; | |
| 456 | |
| 457 sin_get_ip(so, ips[count]); | |
| 458 } | |
| 459 freeaddrinfo(origai); | |
| 460 #else | |
| 461 hp = gethostbyname(addr); | |
| 462 if (hp == NULL) | |
| 463 return h_errno; | |
| 464 | |
| 465 /* get number of IPs */ | |
| 466 count = 0; | |
| 467 while (hp->h_addr_list[count] != NULL) | |
| 468 count++; | |
| 469 | |
| 470 *ips_count = count; | |
|
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471 *ips = t_malloc(sizeof(struct ip_addr) * count); |
| 0 | 472 |
| 473 while (count > 0) { | |
| 474 count--; | |
| 475 | |
| 476 (*ips)[count].family = AF_INET; | |
| 477 memcpy(&(*ips)[count].ip, hp->h_addr_list[count], 4); | |
| 478 } | |
| 479 #endif | |
| 480 | |
| 481 return 0; | |
| 482 } | |
| 483 | |
| 484 /* Get socket address/port */ | |
|
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485 int net_getsockname(int fd, struct ip_addr *addr, unsigned int *port) |
| 0 | 486 { |
| 487 union sockaddr_union so; | |
| 488 socklen_t addrlen; | |
| 489 | |
| 490 i_assert(fd >= 0); | |
| 491 | |
| 492 addrlen = sizeof(so); | |
| 493 if (getsockname(fd, (struct sockaddr *) &so, &addrlen) == -1) | |
| 494 return -1; | |
| 495 | |
| 496 if (addr != NULL) sin_get_ip(&so, addr); | |
| 497 if (port != NULL) *port = sin_get_port(&so); | |
| 498 | |
| 499 return 0; | |
| 500 } | |
| 501 | |
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502 const char *net_ip2addr(const struct ip_addr *ip) |
| 0 | 503 { |
| 504 #ifdef HAVE_IPV6 | |
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505 char addr[MAX_IP_LEN+1]; |
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506 |
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507 addr[MAX_IP_LEN] = '\0'; |
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508 if (inet_ntop(ip->family, &ip->ip, addr, MAX_IP_LEN) == NULL) |
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509 return NULL; |
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510 |
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511 return t_strdup(addr); |
| 0 | 512 #else |
| 513 unsigned long ip4; | |
| 514 | |
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515 if (ip->family != AF_INET) |
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516 return NULL; |
| 0 | 517 |
| 518 ip4 = ntohl(ip->ip.s_addr); | |
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519 return t_strdup_printf("%lu.%lu.%lu.%lu", |
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520 (ip4 & 0xff000000UL) >> 24, |
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521 (ip4 & 0x00ff0000) >> 16, |
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522 (ip4 & 0x0000ff00) >> 8, |
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523 (ip4 & 0x000000ff)); |
| 0 | 524 #endif |
| 525 return 0; | |
| 526 } | |
| 527 | |
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528 int net_addr2ip(const char *addr, struct ip_addr *ip) |
| 0 | 529 { |
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530 if (strchr(addr, ':') != NULL) { |
| 0 | 531 /* IPv6 */ |
| 532 ip->family = AF_INET6; | |
| 533 #ifdef HAVE_IPV6 | |
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534 if (inet_pton(AF_INET6, addr, &ip->ip) == 0) |
| 0 | 535 return -1; |
| 536 #else | |
| 537 ip->ip.s_addr = 0; | |
| 538 #endif | |
| 539 } else { | |
| 540 /* IPv4 */ | |
| 541 ip->family = AF_INET; | |
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542 if (inet_aton(addr, (struct in_addr *) &ip->ip) == 0) |
| 0 | 543 return -1; |
| 544 } | |
| 545 | |
| 546 return 0; | |
| 547 } | |
| 548 | |
| 549 /* Get socket error */ | |
| 550 int net_geterror(int fd) | |
| 551 { | |
| 552 int data; | |
| 553 socklen_t len = sizeof(data); | |
| 554 | |
| 555 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &data, &len) == -1) | |
| 556 return -1; | |
| 557 | |
| 558 return data; | |
| 559 } | |
| 560 | |
| 561 /* get error of net_gethostname() */ | |
| 562 const char *net_gethosterror(int error) | |
| 563 { | |
| 564 #ifdef HAVE_IPV6 | |
| 565 i_assert(error != 0); | |
| 566 | |
| 567 if (error == 1) { | |
| 568 /* getnameinfo() failed */ | |
| 569 return strerror(errno); | |
| 570 } | |
| 571 | |
| 572 return gai_strerror(error); | |
| 573 #else | |
| 574 switch (error) { | |
| 575 case HOST_NOT_FOUND: | |
| 576 return "Host not found"; | |
| 577 case NO_ADDRESS: | |
| 578 return "No IP address found for name"; | |
| 579 case NO_RECOVERY: | |
| 580 return "A non-recovable name server error occurred"; | |
| 581 case TRY_AGAIN: | |
| 582 return "A temporary error on an authoritative name server"; | |
| 583 } | |
| 584 | |
| 585 /* unknown error */ | |
| 586 return NULL; | |
| 587 #endif | |
| 588 } | |
| 589 | |
| 590 /* return TRUE if host lookup failed because it didn't exist (ie. not | |
| 591 some error with name server) */ | |
| 592 int net_hosterror_notfound(int error) | |
| 593 { | |
| 594 #ifdef HAVE_IPV6 | |
| 595 return error != 1 && (error == EAI_NONAME || error == EAI_NODATA); | |
| 596 #else | |
| 597 return error == HOST_NOT_FOUND || error == NO_ADDRESS; | |
| 598 #endif | |
| 599 } | |
| 600 | |
| 601 /* Get name of TCP service */ | |
| 349 | 602 char *net_getservbyport(unsigned short port) |
| 0 | 603 { |
| 604 struct servent *entry; | |
| 605 | |
| 349 | 606 entry = getservbyport(htons(port), "tcp"); |
| 0 | 607 return entry == NULL ? NULL : entry->s_name; |
| 608 } | |
| 609 | |
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610 int is_ipv4_address(const char *addr) |
| 0 | 611 { |
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612 while (*addr != '\0') { |
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613 if (*addr != '.' && !i_isdigit(*addr)) |
| 0 | 614 return 0; |
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615 addr++; |
| 0 | 616 } |
| 617 | |
| 618 return 1; | |
| 619 } | |
| 620 | |
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621 int is_ipv6_address(const char *addr) |
| 0 | 622 { |
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623 while (*addr != '\0') { |
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624 if (*addr != ':' && !i_isxdigit(*addr)) |
| 0 | 625 return 0; |
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626 addr++; |
| 0 | 627 } |
| 628 | |
| 629 return 1; | |
| 630 } |