Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
bfe645c1 | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Functions for doing things with sockets. With the advent of IPv6 this has | |
9 | got messier, so that it's worth pulling out the code into separate functions | |
10 | that other parts of Exim can call, expecially as there are now several | |
11 | different places in the code where sockets are used. */ | |
12 | ||
13 | ||
14 | #include "exim.h" | |
15 | ||
16 | ||
17 | /************************************************* | |
18 | * Create a socket * | |
19 | *************************************************/ | |
20 | ||
21 | /* Socket creation happens in a number of places so it's packaged here for | |
22 | convenience. | |
23 | ||
24 | Arguments: | |
25 | type SOCK_DGRAM or SOCK_STREAM | |
26 | af AF_INET or AF_INET6 | |
27 | ||
28 | Returns: socket number or -1 on failure | |
29 | */ | |
30 | ||
31 | int | |
32 | ip_socket(int type, int af) | |
33 | { | |
34 | int sock = socket(af, type, 0); | |
35 | if (sock < 0) | |
36 | log_write(0, LOG_MAIN, "IPv%c socket creation failed: %s", | |
37 | (af == AF_INET6)? '6':'4', strerror(errno)); | |
38 | return sock; | |
39 | } | |
40 | ||
41 | ||
42 | ||
43 | ||
44 | #if HAVE_IPV6 | |
45 | /************************************************* | |
46 | * Convert printing address to numeric * | |
47 | *************************************************/ | |
48 | ||
49 | /* This function converts the textual form of an IP address into a numeric form | |
50 | in an appropriate structure in an IPv6 environment. The getaddrinfo() function | |
51 | can (apparently) handle more complicated addresses (e.g. those containing | |
52 | scopes) than inet_pton() in some environments. We use hints to tell it that the | |
53 | input must be a numeric address. | |
54 | ||
55 | However, apparently some operating systems (or libraries) don't support | |
56 | getaddrinfo(), so there is a build-time option to revert to inet_pton() (which | |
57 | does not support scopes). | |
58 | ||
59 | Arguments: | |
60 | address textual form of the address | |
61 | addr where to copy back the answer | |
62 | ||
63 | Returns: nothing - failure provokes a panic-die | |
64 | */ | |
65 | ||
66 | static void | |
2b08f192 | 67 | ip_addrinfo(const uschar *address, struct sockaddr_in6 *saddr) |
059ec3d9 PH |
68 | { |
69 | #ifdef IPV6_USE_INET_PTON | |
70 | ||
2b08f192 | 71 | if (inet_pton(AF_INET6, CCS address, &saddr->sin6_addr) != 1) |
059ec3d9 PH |
72 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to parse \"%s\" as an " |
73 | "IP address", address); | |
74 | saddr->sin6_family = AF_INET6; | |
75 | ||
76 | #else | |
77 | ||
78 | int rc; | |
79 | struct addrinfo hints, *res; | |
80 | memset(&hints, 0, sizeof(hints)); | |
81 | hints.ai_family = AF_INET6; | |
82 | hints.ai_socktype = SOCK_STREAM; | |
83 | hints.ai_flags = AI_NUMERICHOST; | |
2b08f192 | 84 | if ((rc = getaddrinfo(CCS address, NULL, &hints, &res)) != 0 || res == NULL) |
059ec3d9 PH |
85 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to parse \"%s\" as an " |
86 | "IP address: %s", address, | |
87 | (rc == 0)? "NULL result returned" : gai_strerror(rc)); | |
88 | memcpy(saddr, res->ai_addr, res->ai_addrlen); | |
89 | freeaddrinfo(res); | |
90 | ||
91 | #endif | |
92 | } | |
93 | #endif /* HAVE_IPV6 */ | |
94 | ||
95 | ||
96 | /************************************************* | |
97 | * Bind socket to interface and port * | |
98 | *************************************************/ | |
99 | ||
059ec3d9 | 100 | int |
bfe645c1 | 101 | ip_addr(void * sin_, int af, const uschar * address, int port) |
059ec3d9 | 102 | { |
bfe645c1 JH |
103 | union sockaddr_46 * sin = sin_; |
104 | memset(sin, 0, sizeof(*sin)); | |
059ec3d9 PH |
105 | |
106 | /* Setup code when using an IPv6 socket. The wildcard address is ":", to | |
107 | ensure an IPv6 socket is used. */ | |
108 | ||
109 | #if HAVE_IPV6 | |
110 | if (af == AF_INET6) | |
111 | { | |
112 | if (address[0] == ':' && address[1] == 0) | |
113 | { | |
bfe645c1 JH |
114 | sin->v6.sin6_family = AF_INET6; |
115 | sin->v6.sin6_addr = in6addr_any; | |
059ec3d9 PH |
116 | } |
117 | else | |
bfe645c1 JH |
118 | ip_addrinfo(address, &sin->v6); /* Panic-dies on error */ |
119 | sin->v6.sin6_port = htons(port); | |
120 | return sizeof(sin->v6); | |
059ec3d9 PH |
121 | } |
122 | else | |
123 | #else /* HAVE_IPv6 */ | |
124 | af = af; /* Avoid compiler warning */ | |
125 | #endif /* HAVE_IPV6 */ | |
126 | ||
127 | /* Setup code when using IPv4 socket. The wildcard address is "". */ | |
128 | ||
129 | { | |
bfe645c1 JH |
130 | sin->v4.sin_family = AF_INET; |
131 | sin->v4.sin_port = htons(port); | |
132 | sin->v4.sin_addr.s_addr = address[0] == 0 | |
133 | ? (S_ADDR_TYPE)INADDR_ANY | |
134 | : (S_ADDR_TYPE)inet_addr(CS address); | |
135 | return sizeof(sin->v4); | |
059ec3d9 | 136 | } |
bfe645c1 JH |
137 | } |
138 | ||
059ec3d9 | 139 | |
059ec3d9 | 140 | |
bfe645c1 JH |
141 | /* This function binds a socket to a local interface address and port. For a |
142 | wildcard IPv6 bind, the address is ":". | |
143 | ||
144 | Arguments: | |
145 | sock the socket | |
146 | af AF_INET or AF_INET6 - the socket type | |
147 | address the IP address, in text form | |
148 | port the IP port (host order) | |
149 | ||
150 | Returns: the result of bind() | |
151 | */ | |
152 | ||
153 | int | |
154 | ip_bind(int sock, int af, uschar *address, int port) | |
155 | { | |
156 | union sockaddr_46 sin; | |
157 | int s_len = ip_addr(&sin, af, address, port); | |
059ec3d9 PH |
158 | return bind(sock, (struct sockaddr *)&sin, s_len); |
159 | } | |
160 | ||
161 | ||
162 | ||
163 | /************************************************* | |
164 | * Connect socket to remote host * | |
165 | *************************************************/ | |
166 | ||
167 | /* This function connects a socket to a remote address and port. The socket may | |
d515a917 PH |
168 | or may not have previously been bound to a local interface. The socket is not |
169 | closed, even in cases of error. It is expected that the calling function, which | |
170 | created the socket, will be the one that closes it. | |
059ec3d9 PH |
171 | |
172 | Arguments: | |
173 | sock the socket | |
174 | af AF_INET6 or AF_INET for the socket type | |
175 | address the remote address, in text form | |
176 | port the remote port | |
b1f8e4f8 | 177 | timeout a timeout (zero for indefinite timeout) |
059ec3d9 PH |
178 | |
179 | Returns: 0 on success; -1 on failure, with errno set | |
180 | */ | |
181 | ||
182 | int | |
2b08f192 | 183 | ip_connect(int sock, int af, const uschar *address, int port, int timeout) |
059ec3d9 PH |
184 | { |
185 | struct sockaddr_in s_in4; | |
186 | struct sockaddr *s_ptr; | |
187 | int s_len, rc, save_errno; | |
188 | ||
189 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ | |
190 | ||
191 | #if HAVE_IPV6 | |
192 | struct sockaddr_in6 s_in6; | |
193 | if (af == AF_INET6) | |
194 | { | |
195 | memset(&s_in6, 0, sizeof(s_in6)); | |
196 | ip_addrinfo(address, &s_in6); /* Panic-dies on error */ | |
197 | s_in6.sin6_port = htons(port); | |
198 | s_ptr = (struct sockaddr *)&s_in6; | |
199 | s_len = sizeof(s_in6); | |
200 | } | |
201 | else | |
202 | #else /* HAVE_IPV6 */ | |
203 | af = af; /* Avoid compiler warning */ | |
204 | #endif /* HAVE_IPV6 */ | |
205 | ||
206 | /* For an IPv4 address, use an IPv4 sockaddr structure, even on a system with | |
207 | IPv6 support. */ | |
208 | ||
209 | { | |
210 | memset(&s_in4, 0, sizeof(s_in4)); | |
211 | s_in4.sin_family = AF_INET; | |
212 | s_in4.sin_port = htons(port); | |
2b08f192 | 213 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(CCS address); |
059ec3d9 PH |
214 | s_ptr = (struct sockaddr *)&s_in4; |
215 | s_len = sizeof(s_in4); | |
216 | } | |
217 | ||
218 | /* If no connection timeout is set, just call connect() without setting a | |
219 | timer, thereby allowing the inbuilt OS timeout to operate. */ | |
220 | ||
221 | sigalrm_seen = FALSE; | |
222 | if (timeout > 0) alarm(timeout); | |
223 | rc = connect(sock, s_ptr, s_len); | |
224 | save_errno = errno; | |
225 | alarm(0); | |
226 | ||
227 | /* There is a testing facility for simulating a connection timeout, as I | |
228 | can't think of any other way of doing this. It converts a connection refused | |
75e0e026 | 229 | into a timeout if the timeout is set to 999999. */ |
059ec3d9 | 230 | |
bfe645c1 | 231 | if (running_in_test_harness && save_errno == ECONNREFUSED && timeout == 999999) |
059ec3d9 | 232 | { |
bfe645c1 JH |
233 | rc = -1; |
234 | save_errno = EINTR; | |
235 | sigalrm_seen = TRUE; | |
059ec3d9 PH |
236 | } |
237 | ||
238 | /* Success */ | |
239 | ||
bfe645c1 JH |
240 | if (rc >= 0) |
241 | { | |
242 | callout_address = string_sprintf("[%s]:%d", address, port); | |
243 | return 0; | |
244 | } | |
059ec3d9 PH |
245 | |
246 | /* A failure whose error code is "Interrupted system call" is in fact | |
247 | an externally applied timeout if the signal handler has been run. */ | |
248 | ||
bfe645c1 | 249 | errno = save_errno == EINTR && sigalrm_seen ? ETIMEDOUT : save_errno; |
059ec3d9 PH |
250 | return -1; |
251 | } | |
252 | ||
253 | ||
a6d4c44e TF |
254 | |
255 | /************************************************* | |
256 | * Create connected socket to remote host * | |
257 | *************************************************/ | |
258 | ||
b1f8e4f8 JH |
259 | /* Create a socket and connect to host (name or number, ipv6 ok) |
260 | at one of port-range. | |
a6d4c44e | 261 | |
b1f8e4f8 JH |
262 | Arguments: |
263 | type SOCK_DGRAM or SOCK_STREAM | |
264 | af AF_INET6 or AF_INET for the socket type | |
265 | address the remote address, in text form | |
266 | portlo,porthi the remote port range | |
267 | timeout a timeout | |
268 | connhost if not NULL, host_item filled in with connection details | |
269 | errstr pointer for allocated string on error | |
270 | ||
271 | Return: | |
272 | socket fd, or -1 on failure (having allocated an error string) | |
273 | */ | |
274 | int | |
275 | ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi, | |
276 | int timeout, host_item * connhost, uschar ** errstr) | |
277 | { | |
278 | int namelen, port; | |
279 | host_item shost; | |
280 | host_item *h; | |
281 | int af = 0, fd, fd4 = -1, fd6 = -1; | |
282 | ||
283 | shost.next = NULL; | |
284 | shost.address = NULL; | |
285 | shost.port = portlo; | |
286 | shost.mx = -1; | |
287 | ||
288 | namelen = Ustrlen(hostname); | |
289 | ||
290 | /* Anything enclosed in [] must be an IP address. */ | |
291 | ||
292 | if (hostname[0] == '[' && | |
293 | hostname[namelen - 1] == ']') | |
294 | { | |
295 | uschar * host = string_copy(hostname); | |
296 | host[namelen - 1] = 0; | |
297 | host++; | |
298 | if (string_is_ip_address(host, NULL) == 0) | |
299 | { | |
300 | *errstr = string_sprintf("malformed IP address \"%s\"", hostname); | |
301 | return -1; | |
302 | } | |
303 | shost.name = shost.address = host; | |
304 | } | |
305 | ||
306 | /* Otherwise check for an unadorned IP address */ | |
307 | ||
308 | else if (string_is_ip_address(hostname, NULL) != 0) | |
309 | shost.name = shost.address = string_copy(hostname); | |
310 | ||
311 | /* Otherwise lookup IP address(es) from the name */ | |
312 | ||
313 | else | |
314 | { | |
315 | shost.name = string_copy(hostname); | |
bfe645c1 JH |
316 | if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, |
317 | NULL, FALSE) != HOST_FOUND) | |
b1f8e4f8 JH |
318 | { |
319 | *errstr = string_sprintf("no IP address found for host %s", shost.name); | |
320 | return -1; | |
321 | } | |
322 | } | |
323 | ||
324 | /* Try to connect to the server - test each IP till one works */ | |
325 | ||
326 | for (h = &shost; h != NULL; h = h->next) | |
327 | { | |
328 | fd = (Ustrchr(h->address, ':') != 0) | |
a6d4c44e TF |
329 | ? (fd6 < 0) ? (fd6 = ip_socket(type, af = AF_INET6)) : fd6 |
330 | : (fd4 < 0) ? (fd4 = ip_socket(type, af = AF_INET )) : fd4; | |
b1f8e4f8 JH |
331 | |
332 | if (fd < 0) | |
333 | { | |
334 | *errstr = string_sprintf("failed to create socket: %s", strerror(errno)); | |
335 | goto bad; | |
336 | } | |
337 | ||
338 | for(port = portlo; port <= porthi; port++) | |
339 | if (ip_connect(fd, af, h->address, port, timeout) == 0) | |
340 | { | |
341 | if (fd != fd6) close(fd6); | |
342 | if (fd != fd4) close(fd4); | |
bfe645c1 JH |
343 | if (connhost) |
344 | { | |
b1f8e4f8 JH |
345 | h->port = port; |
346 | *connhost = *h; | |
347 | connhost->next = NULL; | |
348 | } | |
349 | return fd; | |
350 | } | |
351 | } | |
352 | ||
a9764ac5 JH |
353 | *errstr = string_sprintf("failed to connect to any address for %s: %s", |
354 | hostname, strerror(errno)); | |
b1f8e4f8 JH |
355 | |
356 | bad: | |
357 | close(fd4); close(fd6); return -1; | |
358 | } | |
359 | ||
059ec3d9 | 360 | |
bfe645c1 JH |
361 | int |
362 | ip_tcpsocket(const uschar * hostport, uschar ** errstr, int tmo) | |
363 | { | |
364 | int scan; | |
365 | uschar hostname[256]; | |
366 | unsigned int portlow, porthigh; | |
367 | ||
368 | /* extract host and port part */ | |
369 | scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh); | |
370 | if (scan != 3) | |
371 | { | |
372 | if (scan != 2) | |
373 | { | |
374 | *errstr = string_sprintf("invalid socket '%s'", hostport); | |
375 | return -1; | |
376 | } | |
377 | porthigh = portlow; | |
378 | } | |
379 | ||
380 | return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh, | |
381 | tmo, NULL, errstr); | |
382 | } | |
383 | ||
384 | int | |
385 | ip_unixsocket(const uschar * path, uschar ** errstr) | |
386 | { | |
387 | int sock; | |
388 | struct sockaddr_un server; | |
389 | ||
390 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) | |
391 | { | |
392 | *errstr = US"can't open UNIX socket."; | |
393 | return -1; | |
394 | } | |
395 | ||
396 | server.sun_family = AF_UNIX; | |
397 | Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1); | |
398 | server.sun_path[sizeof(server.sun_path)-1] = '\0'; | |
399 | if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) | |
400 | { | |
401 | int err = errno; | |
402 | (void)close(sock); | |
403 | *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s", | |
404 | path, strerror(err)); | |
405 | return -1; | |
406 | } | |
407 | callout_address = string_copy(path); | |
408 | return sock; | |
409 | } | |
410 | ||
411 | int | |
412 | ip_streamsocket(const uschar * spec, uschar ** errstr, int tmo) | |
413 | { | |
414 | return *spec == '/' | |
415 | ? ip_unixsocket(spec, errstr) : ip_tcpsocket(spec, errstr, tmo); | |
416 | } | |
417 | ||
059ec3d9 PH |
418 | /************************************************* |
419 | * Set keepalive on a socket * | |
420 | *************************************************/ | |
421 | ||
422 | /* Can be called for both incoming and outgoing sockets. | |
423 | ||
424 | Arguments: | |
425 | sock the socket | |
426 | address the remote host address, for failure logging | |
427 | torf true for outgoing connection, false for incoming | |
428 | ||
429 | Returns: nothing | |
430 | */ | |
431 | ||
432 | void | |
bfe645c1 | 433 | ip_keepalive(int sock, const uschar *address, BOOL torf) |
059ec3d9 PH |
434 | { |
435 | int fodder = 1; | |
436 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
437 | (uschar *)(&fodder), sizeof(fodder)) != 0) | |
438 | log_write(0, LOG_MAIN, "setsockopt(SO_KEEPALIVE) on connection %s %s " | |
439 | "failed: %s", torf? "to":"from", address, strerror(errno)); | |
440 | } | |
441 | ||
442 | ||
443 | ||
444 | /************************************************* | |
445 | * Receive from a socket with timeout * | |
446 | *************************************************/ | |
447 | ||
9439f85e | 448 | /* |
059ec3d9 | 449 | Arguments: |
9439f85e JH |
450 | fd the file descriptor |
451 | timeout the timeout, seconds | |
452 | Returns: TRUE => ready for i/o | |
453 | FALSE => timed out, or other error | |
059ec3d9 | 454 | */ |
9439f85e JH |
455 | BOOL |
456 | fd_ready(int fd, int timeout) | |
059ec3d9 PH |
457 | { |
458 | fd_set select_inset; | |
19050083 | 459 | time_t start_recv = time(NULL); |
bfe645c1 | 460 | int time_left = timeout; |
059ec3d9 PH |
461 | int rc; |
462 | ||
bfe645c1 | 463 | if (time_left <= 0) |
9439f85e JH |
464 | { |
465 | errno = ETIMEDOUT; | |
466 | return FALSE; | |
467 | } | |
059ec3d9 PH |
468 | /* Wait until the socket is ready */ |
469 | ||
bfe645c1 | 470 | do |
059ec3d9 | 471 | { |
bfe645c1 | 472 | struct timeval tv = { time_left, 0 }; |
059ec3d9 | 473 | FD_ZERO (&select_inset); |
9439f85e | 474 | FD_SET (fd, &select_inset); |
059ec3d9 | 475 | |
0e42da1b | 476 | /*DEBUG(D_transport) debug_printf("waiting for data on fd\n");*/ |
9439f85e | 477 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&select_inset, NULL, NULL, &tv); |
059ec3d9 PH |
478 | |
479 | /* If some interrupt arrived, just retry. We presume this to be rare, | |
480 | but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes | |
481 | select() to exit). | |
482 | ||
483 | Aug 2004: Somebody set up a cron job that ran exiwhat every 2 minutes, making | |
484 | the interrupt not at all rare. Since the timeout is typically more than 2 | |
485 | minutes, the effect was to block the timeout completely. To prevent this | |
bfe645c1 JH |
486 | happening again, we do an explicit time test and adjust the timeout |
487 | accordingly */ | |
059ec3d9 PH |
488 | |
489 | if (rc < 0 && errno == EINTR) | |
490 | { | |
491 | DEBUG(D_transport) debug_printf("EINTR while waiting for socket data\n"); | |
059ec3d9 | 492 | |
bfe645c1 JH |
493 | /* Watch out, 'continue' jumps to the condition, not to the loops top */ |
494 | time_left = timeout - (time(NULL) - start_recv); | |
495 | if (time_left > 0) continue; | |
496 | } | |
059ec3d9 PH |
497 | |
498 | if (rc <= 0) | |
499 | { | |
500 | errno = ETIMEDOUT; | |
9439f85e | 501 | return FALSE; |
059ec3d9 PH |
502 | } |
503 | ||
bfe645c1 JH |
504 | /* Checking the FD_ISSET is not enough, if we're interrupted, the |
505 | select_inset may still contain the 'input'. */ | |
059ec3d9 | 506 | } |
bfe645c1 | 507 | while (rc < 0 || !FD_ISSET(fd, &select_inset)); |
9439f85e JH |
508 | return TRUE; |
509 | } | |
510 | ||
511 | /* The timeout is implemented using select(), and we loop to cover select() | |
512 | getting interrupted, and the possibility of select() returning with a positive | |
513 | result but no ready descriptor. Is this in fact possible? | |
514 | ||
515 | Arguments: | |
516 | sock the socket | |
517 | buffer to read into | |
518 | bufsize the buffer size | |
519 | timeout the timeout | |
520 | ||
521 | Returns: > 0 => that much data read | |
522 | <= 0 on error or EOF; errno set - zero for EOF | |
523 | */ | |
524 | ||
525 | int | |
526 | ip_recv(int sock, uschar *buffer, int buffsize, int timeout) | |
527 | { | |
528 | int rc; | |
529 | ||
530 | if (!fd_ready(sock, timeout)) | |
531 | return -1; | |
059ec3d9 PH |
532 | |
533 | /* The socket is ready, read from it (via TLS if it's active). On EOF (i.e. | |
534 | close down of the connection), set errno to zero; otherwise leave it alone. */ | |
535 | ||
536 | #ifdef SUPPORT_TLS | |
817d9f57 JH |
537 | if (tls_out.active == sock) |
538 | rc = tls_read(FALSE, buffer, buffsize); | |
539 | else if (tls_in.active == sock) | |
540 | rc = tls_read(TRUE, buffer, buffsize); | |
059ec3d9 PH |
541 | else |
542 | #endif | |
543 | rc = recv(sock, buffer, buffsize, 0); | |
544 | ||
545 | if (rc > 0) return rc; | |
546 | if (rc == 0) errno = 0; | |
547 | return -1; | |
548 | } | |
549 | ||
550 | ||
9e4f5962 PP |
551 | |
552 | ||
13363eba PP |
553 | /************************************************* |
554 | * Lookup address family of potential socket * | |
555 | *************************************************/ | |
556 | ||
557 | /* Given a file-descriptor, check to see if it's a socket and, if so, | |
558 | return the address family; detects IPv4 vs IPv6. If not a socket then | |
559 | return -1. | |
560 | ||
561 | The value 0 is typically AF_UNSPEC, which should not be seen on a connected | |
562 | fd. If the return is -1, the errno will be from getsockname(); probably | |
563 | ENOTSOCK or ECONNRESET. | |
564 | ||
565 | Arguments: socket-or-not fd | |
566 | Returns: address family or -1 | |
567 | */ | |
568 | ||
569 | int | |
570 | ip_get_address_family(int fd) | |
571 | { | |
572 | struct sockaddr_storage ss; | |
573 | socklen_t sslen = sizeof(ss); | |
574 | ||
575 | if (getsockname(fd, (struct sockaddr *) &ss, &sslen) < 0) | |
576 | return -1; | |
577 | ||
578 | return (int) ss.ss_family; | |
579 | } | |
580 | ||
581 | ||
582 | ||
583 | ||
9e4f5962 PP |
584 | /************************************************* |
585 | * Lookup DSCP settings for a socket * | |
586 | *************************************************/ | |
587 | ||
588 | struct dscp_name_tableentry { | |
589 | const uschar *name; | |
590 | int value; | |
591 | }; | |
592 | /* Keep both of these tables sorted! */ | |
593 | static struct dscp_name_tableentry dscp_table[] = { | |
594 | #ifdef IPTOS_DSCP_AF11 | |
36a3ae5f PP |
595 | { CUS"af11", IPTOS_DSCP_AF11 }, |
596 | { CUS"af12", IPTOS_DSCP_AF12 }, | |
597 | { CUS"af13", IPTOS_DSCP_AF13 }, | |
598 | { CUS"af21", IPTOS_DSCP_AF21 }, | |
599 | { CUS"af22", IPTOS_DSCP_AF22 }, | |
600 | { CUS"af23", IPTOS_DSCP_AF23 }, | |
601 | { CUS"af31", IPTOS_DSCP_AF31 }, | |
602 | { CUS"af32", IPTOS_DSCP_AF32 }, | |
603 | { CUS"af33", IPTOS_DSCP_AF33 }, | |
604 | { CUS"af41", IPTOS_DSCP_AF41 }, | |
605 | { CUS"af42", IPTOS_DSCP_AF42 }, | |
606 | { CUS"af43", IPTOS_DSCP_AF43 }, | |
607 | { CUS"ef", IPTOS_DSCP_EF }, | |
9e4f5962 PP |
608 | #endif |
609 | #ifdef IPTOS_LOWCOST | |
36a3ae5f | 610 | { CUS"lowcost", IPTOS_LOWCOST }, |
9e4f5962 | 611 | #endif |
36a3ae5f | 612 | { CUS"lowdelay", IPTOS_LOWDELAY }, |
9e4f5962 | 613 | #ifdef IPTOS_MINCOST |
36a3ae5f | 614 | { CUS"mincost", IPTOS_MINCOST }, |
9e4f5962 | 615 | #endif |
36a3ae5f PP |
616 | { CUS"reliability", IPTOS_RELIABILITY }, |
617 | { CUS"throughput", IPTOS_THROUGHPUT } | |
9e4f5962 PP |
618 | }; |
619 | static int dscp_table_size = | |
620 | sizeof(dscp_table) / sizeof(struct dscp_name_tableentry); | |
621 | ||
622 | /* DSCP values change by protocol family, and so do the options used for | |
2a1b36b3 PP |
623 | setsockopt(); this utility does all the lookups. It takes an unexpanded |
624 | option string, expands it, strips off affix whitespace, then checks if it's | |
625 | a number. If all of what's left is a number, then that's how the option will | |
626 | be parsed and success/failure is a range check. If it's not all a number, | |
627 | then it must be a supported keyword. | |
9e4f5962 PP |
628 | |
629 | Arguments: | |
630 | dscp_name a string, so far unvalidated | |
631 | af address_family in use | |
632 | level setsockopt level to use | |
633 | optname setsockopt name to use | |
634 | dscp_value value for dscp_name | |
635 | ||
636 | Returns: TRUE if okay to setsockopt(), else FALSE | |
2a1b36b3 PP |
637 | |
638 | *level and *optname may be set even if FALSE is returned | |
9e4f5962 PP |
639 | */ |
640 | ||
641 | BOOL | |
642 | dscp_lookup(const uschar *dscp_name, int af, | |
643 | int *level, int *optname, int *dscp_value) | |
644 | { | |
2a1b36b3 | 645 | uschar *dscp_lookup, *p; |
9e4f5962 | 646 | int first, last; |
2a1b36b3 | 647 | long rawlong; |
9e4f5962 PP |
648 | |
649 | if (af == AF_INET) | |
650 | { | |
651 | *level = IPPROTO_IP; | |
652 | *optname = IP_TOS; | |
653 | } | |
bb7b9411 | 654 | #if HAVE_IPV6 && defined(IPV6_TCLASS) |
9e4f5962 PP |
655 | else if (af == AF_INET6) |
656 | { | |
657 | *level = IPPROTO_IPV6; | |
658 | *optname = IPV6_TCLASS; | |
659 | } | |
b301a50b | 660 | #endif |
9e4f5962 PP |
661 | else |
662 | { | |
663 | DEBUG(D_transport) | |
664 | debug_printf("Unhandled address family %d in dscp_lookup()\n", af); | |
665 | return FALSE; | |
666 | } | |
667 | if (!dscp_name) | |
668 | { | |
669 | DEBUG(D_transport) | |
670 | debug_printf("[empty DSCP]\n"); | |
671 | return FALSE; | |
672 | } | |
673 | dscp_lookup = expand_string(US dscp_name); | |
674 | if (dscp_lookup == NULL || *dscp_lookup == '\0') | |
675 | return FALSE; | |
676 | ||
2a1b36b3 PP |
677 | p = dscp_lookup + Ustrlen(dscp_lookup) - 1; |
678 | while (isspace(*p)) *p-- = '\0'; | |
679 | while (isspace(*dscp_lookup) && dscp_lookup < p) dscp_lookup++; | |
680 | if (*dscp_lookup == '\0') | |
681 | return FALSE; | |
682 | ||
683 | rawlong = Ustrtol(dscp_lookup, &p, 0); | |
684 | if (p != dscp_lookup && *p == '\0') | |
685 | { | |
686 | /* We have six bits available, which will end up shifted to fit in 0xFC mask. | |
687 | RFC 2597 defines the values unshifted. */ | |
688 | if (rawlong < 0 || rawlong > 0x3F) | |
689 | { | |
690 | DEBUG(D_transport) | |
691 | debug_printf("DSCP value %ld out of range, ignored.\n", rawlong); | |
692 | return FALSE; | |
693 | } | |
694 | *dscp_value = rawlong << 2; | |
695 | return TRUE; | |
696 | } | |
697 | ||
9e4f5962 PP |
698 | first = 0; |
699 | last = dscp_table_size; | |
700 | while (last > first) | |
701 | { | |
702 | int middle = (first + last)/2; | |
703 | int c = Ustrcmp(dscp_lookup, dscp_table[middle].name); | |
704 | if (c == 0) | |
705 | { | |
706 | *dscp_value = dscp_table[middle].value; | |
707 | return TRUE; | |
708 | } | |
709 | else if (c > 0) | |
9e4f5962 | 710 | first = middle + 1; |
9e4f5962 | 711 | else |
9e4f5962 | 712 | last = middle; |
9e4f5962 PP |
713 | } |
714 | return FALSE; | |
715 | } | |
716 | ||
36a3ae5f PP |
717 | void |
718 | dscp_list_to_stream(FILE *stream) | |
719 | { | |
720 | int i; | |
721 | for (i=0; i < dscp_table_size; ++i) | |
722 | fprintf(stream, "%s\n", dscp_table[i].name); | |
723 | } | |
724 | ||
9e4f5962 | 725 | |
059ec3d9 | 726 | /* End of ip.c */ |
bfe645c1 JH |
727 | /* vi: aw ai sw=2 |
728 | */ |