Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
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 | |
a56cc2b8 | 67 | ip_addrinfo(const uschar *address, struct sockaddr_in6 *saddr) |
059ec3d9 PH |
68 | { |
69 | #ifdef IPV6_USE_INET_PTON | |
70 | ||
a56cc2b8 | 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; | |
a56cc2b8 | 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 |
7eb6c37c | 101 | ip_addr(void * sin_, int af, const uschar * address, int port) |
059ec3d9 | 102 | { |
7eb6c37c | 103 | union sockaddr_46 * sin = sin_; |
69cbeaec | 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 | { | |
7eb6c37c JH |
114 | sin->v6.sin6_family = AF_INET6; |
115 | sin->v6.sin6_addr = in6addr_any; | |
059ec3d9 PH |
116 | } |
117 | else | |
7eb6c37c 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 | { | |
7eb6c37c 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 | } |
7eb6c37c | 137 | } |
059ec3d9 | 138 | |
059ec3d9 | 139 | |
7eb6c37c JH |
140 | |
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 | |
a56cc2b8 | 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); | |
a56cc2b8 | 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 | ||
af483912 | 221 | callout_address = string_sprintf("[%s]:%d", address, port); |
059ec3d9 PH |
222 | sigalrm_seen = FALSE; |
223 | if (timeout > 0) alarm(timeout); | |
224 | rc = connect(sock, s_ptr, s_len); | |
225 | save_errno = errno; | |
226 | alarm(0); | |
227 | ||
228 | /* There is a testing facility for simulating a connection timeout, as I | |
229 | can't think of any other way of doing this. It converts a connection refused | |
75e0e026 | 230 | into a timeout if the timeout is set to 999999. */ |
059ec3d9 | 231 | |
a39bd74d | 232 | if (running_in_test_harness && save_errno == ECONNREFUSED && timeout == 999999) |
059ec3d9 | 233 | { |
a39bd74d JB |
234 | rc = -1; |
235 | save_errno = EINTR; | |
236 | sigalrm_seen = TRUE; | |
059ec3d9 PH |
237 | } |
238 | ||
239 | /* Success */ | |
240 | ||
055e2cb4 | 241 | if (rc >= 0) |
055e2cb4 | 242 | return 0; |
059ec3d9 PH |
243 | |
244 | /* A failure whose error code is "Interrupted system call" is in fact | |
245 | an externally applied timeout if the signal handler has been run. */ | |
246 | ||
a39bd74d | 247 | errno = save_errno == EINTR && sigalrm_seen ? ETIMEDOUT : save_errno; |
059ec3d9 PH |
248 | return -1; |
249 | } | |
250 | ||
251 | ||
a6d4c44e TF |
252 | |
253 | /************************************************* | |
254 | * Create connected socket to remote host * | |
255 | *************************************************/ | |
256 | ||
b1f8e4f8 JH |
257 | /* Create a socket and connect to host (name or number, ipv6 ok) |
258 | at one of port-range. | |
a6d4c44e | 259 | |
b1f8e4f8 JH |
260 | Arguments: |
261 | type SOCK_DGRAM or SOCK_STREAM | |
262 | af AF_INET6 or AF_INET for the socket type | |
263 | address the remote address, in text form | |
264 | portlo,porthi the remote port range | |
265 | timeout a timeout | |
266 | connhost if not NULL, host_item filled in with connection details | |
267 | errstr pointer for allocated string on error | |
268 | ||
269 | Return: | |
270 | socket fd, or -1 on failure (having allocated an error string) | |
271 | */ | |
272 | int | |
273 | ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi, | |
274 | int timeout, host_item * connhost, uschar ** errstr) | |
275 | { | |
276 | int namelen, port; | |
277 | host_item shost; | |
278 | host_item *h; | |
279 | int af = 0, fd, fd4 = -1, fd6 = -1; | |
280 | ||
281 | shost.next = NULL; | |
282 | shost.address = NULL; | |
283 | shost.port = portlo; | |
284 | shost.mx = -1; | |
285 | ||
286 | namelen = Ustrlen(hostname); | |
287 | ||
288 | /* Anything enclosed in [] must be an IP address. */ | |
289 | ||
290 | if (hostname[0] == '[' && | |
291 | hostname[namelen - 1] == ']') | |
292 | { | |
af483912 | 293 | uschar * host = string_copyn(hostname+1, namelen-2); |
b1f8e4f8 JH |
294 | if (string_is_ip_address(host, NULL) == 0) |
295 | { | |
296 | *errstr = string_sprintf("malformed IP address \"%s\"", hostname); | |
297 | return -1; | |
298 | } | |
299 | shost.name = shost.address = host; | |
300 | } | |
301 | ||
302 | /* Otherwise check for an unadorned IP address */ | |
303 | ||
304 | else if (string_is_ip_address(hostname, NULL) != 0) | |
af483912 | 305 | shost.name = shost.address = string_copyn(hostname, namelen); |
b1f8e4f8 JH |
306 | |
307 | /* Otherwise lookup IP address(es) from the name */ | |
308 | ||
309 | else | |
310 | { | |
af483912 | 311 | shost.name = string_copyn(hostname, namelen); |
1f155f8e JH |
312 | if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, |
313 | NULL, FALSE) != HOST_FOUND) | |
b1f8e4f8 JH |
314 | { |
315 | *errstr = string_sprintf("no IP address found for host %s", shost.name); | |
316 | return -1; | |
317 | } | |
318 | } | |
319 | ||
320 | /* Try to connect to the server - test each IP till one works */ | |
321 | ||
322 | for (h = &shost; h != NULL; h = h->next) | |
323 | { | |
af483912 JH |
324 | fd = Ustrchr(h->address, ':') != 0 |
325 | ? fd6 < 0 ? (fd6 = ip_socket(type, af = AF_INET6)) : fd6 | |
326 | : fd4 < 0 ? (fd4 = ip_socket(type, af = AF_INET )) : fd4; | |
b1f8e4f8 JH |
327 | |
328 | if (fd < 0) | |
329 | { | |
330 | *errstr = string_sprintf("failed to create socket: %s", strerror(errno)); | |
331 | goto bad; | |
332 | } | |
333 | ||
334 | for(port = portlo; port <= porthi; port++) | |
335 | if (ip_connect(fd, af, h->address, port, timeout) == 0) | |
336 | { | |
337 | if (fd != fd6) close(fd6); | |
338 | if (fd != fd4) close(fd4); | |
8a512ed5 JH |
339 | if (connhost) |
340 | { | |
b1f8e4f8 JH |
341 | h->port = port; |
342 | *connhost = *h; | |
343 | connhost->next = NULL; | |
344 | } | |
345 | return fd; | |
346 | } | |
347 | } | |
348 | ||
a9764ac5 JH |
349 | *errstr = string_sprintf("failed to connect to any address for %s: %s", |
350 | hostname, strerror(errno)); | |
b1f8e4f8 JH |
351 | |
352 | bad: | |
353 | close(fd4); close(fd6); return -1; | |
354 | } | |
355 | ||
059ec3d9 | 356 | |
3e60dd41 JH |
357 | int |
358 | ip_tcpsocket(const uschar * hostport, uschar ** errstr, int tmo) | |
359 | { | |
a39bd74d JB |
360 | int scan; |
361 | uschar hostname[256]; | |
362 | unsigned int portlow, porthigh; | |
363 | ||
364 | /* extract host and port part */ | |
365 | scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh); | |
366 | if (scan != 3) | |
367 | { | |
368 | if (scan != 2) | |
369 | { | |
370 | *errstr = string_sprintf("invalid socket '%s'", hostport); | |
371 | return -1; | |
3e60dd41 | 372 | } |
a39bd74d | 373 | porthigh = portlow; |
3e60dd41 JH |
374 | } |
375 | ||
a39bd74d JB |
376 | return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh, |
377 | tmo, NULL, errstr); | |
3e60dd41 JH |
378 | } |
379 | ||
380 | int | |
381 | ip_unixsocket(const uschar * path, uschar ** errstr) | |
382 | { | |
a39bd74d JB |
383 | int sock; |
384 | struct sockaddr_un server; | |
3e60dd41 | 385 | |
a39bd74d JB |
386 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) |
387 | { | |
388 | *errstr = US"can't open UNIX socket."; | |
389 | return -1; | |
3e60dd41 JH |
390 | } |
391 | ||
af483912 | 392 | callout_address = string_copy(path); |
a39bd74d JB |
393 | server.sun_family = AF_UNIX; |
394 | Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1); | |
395 | server.sun_path[sizeof(server.sun_path)-1] = '\0'; | |
396 | if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) | |
397 | { | |
398 | int err = errno; | |
399 | (void)close(sock); | |
400 | *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s", | |
401 | path, strerror(err)); | |
402 | return -1; | |
403 | } | |
404 | return sock; | |
3e60dd41 JH |
405 | } |
406 | ||
407 | int | |
408 | ip_streamsocket(const uschar * spec, uschar ** errstr, int tmo) | |
409 | { | |
a39bd74d JB |
410 | return *spec == '/' |
411 | ? ip_unixsocket(spec, errstr) : ip_tcpsocket(spec, errstr, tmo); | |
3e60dd41 JH |
412 | } |
413 | ||
059ec3d9 PH |
414 | /************************************************* |
415 | * Set keepalive on a socket * | |
416 | *************************************************/ | |
417 | ||
418 | /* Can be called for both incoming and outgoing sockets. | |
419 | ||
420 | Arguments: | |
421 | sock the socket | |
422 | address the remote host address, for failure logging | |
423 | torf true for outgoing connection, false for incoming | |
424 | ||
425 | Returns: nothing | |
426 | */ | |
427 | ||
428 | void | |
55414b25 | 429 | ip_keepalive(int sock, const uschar *address, BOOL torf) |
059ec3d9 PH |
430 | { |
431 | int fodder = 1; | |
432 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
433 | (uschar *)(&fodder), sizeof(fodder)) != 0) | |
434 | log_write(0, LOG_MAIN, "setsockopt(SO_KEEPALIVE) on connection %s %s " | |
435 | "failed: %s", torf? "to":"from", address, strerror(errno)); | |
436 | } | |
437 | ||
438 | ||
439 | ||
440 | /************************************************* | |
441 | * Receive from a socket with timeout * | |
442 | *************************************************/ | |
443 | ||
4e71661f | 444 | /* |
059ec3d9 | 445 | Arguments: |
4e71661f JH |
446 | fd the file descriptor |
447 | timeout the timeout, seconds | |
448 | Returns: TRUE => ready for i/o | |
449 | FALSE => timed out, or other error | |
059ec3d9 | 450 | */ |
4e71661f JH |
451 | BOOL |
452 | fd_ready(int fd, int timeout) | |
059ec3d9 PH |
453 | { |
454 | fd_set select_inset; | |
19050083 | 455 | time_t start_recv = time(NULL); |
c528cec4 | 456 | int time_left = timeout; |
059ec3d9 PH |
457 | int rc; |
458 | ||
85ff3cf9 | 459 | if (time_left <= 0) |
4e71661f JH |
460 | { |
461 | errno = ETIMEDOUT; | |
462 | return FALSE; | |
463 | } | |
059ec3d9 PH |
464 | /* Wait until the socket is ready */ |
465 | ||
a39bd74d | 466 | do |
059ec3d9 | 467 | { |
c528cec4 | 468 | struct timeval tv = { time_left, 0 }; |
059ec3d9 | 469 | FD_ZERO (&select_inset); |
4e71661f | 470 | FD_SET (fd, &select_inset); |
059ec3d9 | 471 | |
0f0c8159 | 472 | /*DEBUG(D_transport) debug_printf("waiting for data on fd\n");*/ |
4e71661f | 473 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&select_inset, NULL, NULL, &tv); |
059ec3d9 PH |
474 | |
475 | /* If some interrupt arrived, just retry. We presume this to be rare, | |
476 | but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes | |
477 | select() to exit). | |
478 | ||
479 | Aug 2004: Somebody set up a cron job that ran exiwhat every 2 minutes, making | |
480 | the interrupt not at all rare. Since the timeout is typically more than 2 | |
481 | minutes, the effect was to block the timeout completely. To prevent this | |
c528cec4 HSHR |
482 | happening again, we do an explicit time test and adjust the timeout |
483 | accordingly */ | |
059ec3d9 PH |
484 | |
485 | if (rc < 0 && errno == EINTR) | |
486 | { | |
487 | DEBUG(D_transport) debug_printf("EINTR while waiting for socket data\n"); | |
85ff3cf9 | 488 | |
c528cec4 | 489 | /* Watch out, 'continue' jumps to the condition, not to the loops top */ |
85ff3cf9 HSHR |
490 | time_left = timeout - (time(NULL) - start_recv); |
491 | if (time_left > 0) continue; | |
059ec3d9 PH |
492 | } |
493 | ||
059ec3d9 PH |
494 | if (rc <= 0) |
495 | { | |
496 | errno = ETIMEDOUT; | |
4e71661f | 497 | return FALSE; |
059ec3d9 PH |
498 | } |
499 | ||
c528cec4 HSHR |
500 | /* Checking the FD_ISSET is not enough, if we're interrupted, the |
501 | select_inset may still contain the 'input'. */ | |
059ec3d9 | 502 | } |
4bd6107d | 503 | while (rc < 0 || !FD_ISSET(fd, &select_inset)); |
4e71661f JH |
504 | return TRUE; |
505 | } | |
506 | ||
507 | /* The timeout is implemented using select(), and we loop to cover select() | |
508 | getting interrupted, and the possibility of select() returning with a positive | |
509 | result but no ready descriptor. Is this in fact possible? | |
510 | ||
511 | Arguments: | |
512 | sock the socket | |
513 | buffer to read into | |
514 | bufsize the buffer size | |
515 | timeout the timeout | |
516 | ||
517 | Returns: > 0 => that much data read | |
518 | <= 0 on error or EOF; errno set - zero for EOF | |
519 | */ | |
520 | ||
521 | int | |
522 | ip_recv(int sock, uschar *buffer, int buffsize, int timeout) | |
523 | { | |
524 | int rc; | |
525 | ||
526 | if (!fd_ready(sock, timeout)) | |
527 | return -1; | |
059ec3d9 PH |
528 | |
529 | /* The socket is ready, read from it (via TLS if it's active). On EOF (i.e. | |
530 | close down of the connection), set errno to zero; otherwise leave it alone. */ | |
531 | ||
532 | #ifdef SUPPORT_TLS | |
817d9f57 JH |
533 | if (tls_out.active == sock) |
534 | rc = tls_read(FALSE, buffer, buffsize); | |
535 | else if (tls_in.active == sock) | |
536 | rc = tls_read(TRUE, buffer, buffsize); | |
059ec3d9 PH |
537 | else |
538 | #endif | |
539 | rc = recv(sock, buffer, buffsize, 0); | |
540 | ||
541 | if (rc > 0) return rc; | |
542 | if (rc == 0) errno = 0; | |
543 | return -1; | |
544 | } | |
545 | ||
546 | ||
9e4f5962 PP |
547 | |
548 | ||
13363eba PP |
549 | /************************************************* |
550 | * Lookup address family of potential socket * | |
551 | *************************************************/ | |
552 | ||
553 | /* Given a file-descriptor, check to see if it's a socket and, if so, | |
554 | return the address family; detects IPv4 vs IPv6. If not a socket then | |
555 | return -1. | |
556 | ||
557 | The value 0 is typically AF_UNSPEC, which should not be seen on a connected | |
558 | fd. If the return is -1, the errno will be from getsockname(); probably | |
559 | ENOTSOCK or ECONNRESET. | |
560 | ||
561 | Arguments: socket-or-not fd | |
562 | Returns: address family or -1 | |
563 | */ | |
564 | ||
565 | int | |
566 | ip_get_address_family(int fd) | |
567 | { | |
568 | struct sockaddr_storage ss; | |
569 | socklen_t sslen = sizeof(ss); | |
570 | ||
571 | if (getsockname(fd, (struct sockaddr *) &ss, &sslen) < 0) | |
572 | return -1; | |
573 | ||
574 | return (int) ss.ss_family; | |
575 | } | |
576 | ||
577 | ||
578 | ||
579 | ||
9e4f5962 PP |
580 | /************************************************* |
581 | * Lookup DSCP settings for a socket * | |
582 | *************************************************/ | |
583 | ||
584 | struct dscp_name_tableentry { | |
585 | const uschar *name; | |
586 | int value; | |
587 | }; | |
588 | /* Keep both of these tables sorted! */ | |
589 | static struct dscp_name_tableentry dscp_table[] = { | |
590 | #ifdef IPTOS_DSCP_AF11 | |
36a3ae5f PP |
591 | { CUS"af11", IPTOS_DSCP_AF11 }, |
592 | { CUS"af12", IPTOS_DSCP_AF12 }, | |
593 | { CUS"af13", IPTOS_DSCP_AF13 }, | |
594 | { CUS"af21", IPTOS_DSCP_AF21 }, | |
595 | { CUS"af22", IPTOS_DSCP_AF22 }, | |
596 | { CUS"af23", IPTOS_DSCP_AF23 }, | |
597 | { CUS"af31", IPTOS_DSCP_AF31 }, | |
598 | { CUS"af32", IPTOS_DSCP_AF32 }, | |
599 | { CUS"af33", IPTOS_DSCP_AF33 }, | |
600 | { CUS"af41", IPTOS_DSCP_AF41 }, | |
601 | { CUS"af42", IPTOS_DSCP_AF42 }, | |
602 | { CUS"af43", IPTOS_DSCP_AF43 }, | |
603 | { CUS"ef", IPTOS_DSCP_EF }, | |
9e4f5962 PP |
604 | #endif |
605 | #ifdef IPTOS_LOWCOST | |
36a3ae5f | 606 | { CUS"lowcost", IPTOS_LOWCOST }, |
9e4f5962 | 607 | #endif |
36a3ae5f | 608 | { CUS"lowdelay", IPTOS_LOWDELAY }, |
9e4f5962 | 609 | #ifdef IPTOS_MINCOST |
36a3ae5f | 610 | { CUS"mincost", IPTOS_MINCOST }, |
9e4f5962 | 611 | #endif |
36a3ae5f PP |
612 | { CUS"reliability", IPTOS_RELIABILITY }, |
613 | { CUS"throughput", IPTOS_THROUGHPUT } | |
9e4f5962 PP |
614 | }; |
615 | static int dscp_table_size = | |
616 | sizeof(dscp_table) / sizeof(struct dscp_name_tableentry); | |
617 | ||
618 | /* DSCP values change by protocol family, and so do the options used for | |
2a1b36b3 PP |
619 | setsockopt(); this utility does all the lookups. It takes an unexpanded |
620 | option string, expands it, strips off affix whitespace, then checks if it's | |
621 | a number. If all of what's left is a number, then that's how the option will | |
622 | be parsed and success/failure is a range check. If it's not all a number, | |
623 | then it must be a supported keyword. | |
9e4f5962 PP |
624 | |
625 | Arguments: | |
626 | dscp_name a string, so far unvalidated | |
627 | af address_family in use | |
628 | level setsockopt level to use | |
629 | optname setsockopt name to use | |
630 | dscp_value value for dscp_name | |
631 | ||
632 | Returns: TRUE if okay to setsockopt(), else FALSE | |
2a1b36b3 PP |
633 | |
634 | *level and *optname may be set even if FALSE is returned | |
9e4f5962 PP |
635 | */ |
636 | ||
637 | BOOL | |
638 | dscp_lookup(const uschar *dscp_name, int af, | |
639 | int *level, int *optname, int *dscp_value) | |
640 | { | |
2a1b36b3 | 641 | uschar *dscp_lookup, *p; |
9e4f5962 | 642 | int first, last; |
2a1b36b3 | 643 | long rawlong; |
9e4f5962 PP |
644 | |
645 | if (af == AF_INET) | |
646 | { | |
647 | *level = IPPROTO_IP; | |
648 | *optname = IP_TOS; | |
649 | } | |
bb7b9411 | 650 | #if HAVE_IPV6 && defined(IPV6_TCLASS) |
9e4f5962 PP |
651 | else if (af == AF_INET6) |
652 | { | |
653 | *level = IPPROTO_IPV6; | |
654 | *optname = IPV6_TCLASS; | |
655 | } | |
b301a50b | 656 | #endif |
9e4f5962 PP |
657 | else |
658 | { | |
659 | DEBUG(D_transport) | |
660 | debug_printf("Unhandled address family %d in dscp_lookup()\n", af); | |
661 | return FALSE; | |
662 | } | |
663 | if (!dscp_name) | |
664 | { | |
665 | DEBUG(D_transport) | |
666 | debug_printf("[empty DSCP]\n"); | |
667 | return FALSE; | |
668 | } | |
669 | dscp_lookup = expand_string(US dscp_name); | |
670 | if (dscp_lookup == NULL || *dscp_lookup == '\0') | |
671 | return FALSE; | |
672 | ||
2a1b36b3 PP |
673 | p = dscp_lookup + Ustrlen(dscp_lookup) - 1; |
674 | while (isspace(*p)) *p-- = '\0'; | |
675 | while (isspace(*dscp_lookup) && dscp_lookup < p) dscp_lookup++; | |
676 | if (*dscp_lookup == '\0') | |
677 | return FALSE; | |
678 | ||
679 | rawlong = Ustrtol(dscp_lookup, &p, 0); | |
680 | if (p != dscp_lookup && *p == '\0') | |
681 | { | |
682 | /* We have six bits available, which will end up shifted to fit in 0xFC mask. | |
683 | RFC 2597 defines the values unshifted. */ | |
684 | if (rawlong < 0 || rawlong > 0x3F) | |
685 | { | |
686 | DEBUG(D_transport) | |
687 | debug_printf("DSCP value %ld out of range, ignored.\n", rawlong); | |
688 | return FALSE; | |
689 | } | |
690 | *dscp_value = rawlong << 2; | |
691 | return TRUE; | |
692 | } | |
693 | ||
9e4f5962 PP |
694 | first = 0; |
695 | last = dscp_table_size; | |
696 | while (last > first) | |
697 | { | |
698 | int middle = (first + last)/2; | |
699 | int c = Ustrcmp(dscp_lookup, dscp_table[middle].name); | |
700 | if (c == 0) | |
701 | { | |
702 | *dscp_value = dscp_table[middle].value; | |
703 | return TRUE; | |
704 | } | |
705 | else if (c > 0) | |
9e4f5962 | 706 | first = middle + 1; |
9e4f5962 | 707 | else |
9e4f5962 | 708 | last = middle; |
9e4f5962 PP |
709 | } |
710 | return FALSE; | |
711 | } | |
712 | ||
36a3ae5f PP |
713 | void |
714 | dscp_list_to_stream(FILE *stream) | |
715 | { | |
716 | int i; | |
717 | for (i=0; i < dscp_table_size; ++i) | |
718 | fprintf(stream, "%s\n", dscp_table[i].name); | |
719 | } | |
720 | ||
9e4f5962 | 721 | |
059ec3d9 | 722 | /* End of ip.c */ |
8a512ed5 JH |
723 | /* vi: aw ai sw=2 |
724 | */ |