Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
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 | ||
100 | /* This function binds a socket to a local interface address and port. For a | |
101 | wildcard IPv6 bind, the address is ":". | |
102 | ||
103 | Arguments: | |
104 | sock the socket | |
105 | af AF_INET or AF_INET6 - the socket type | |
106 | address the IP address, in text form | |
107 | port the IP port (host order) | |
108 | ||
109 | Returns: the result of bind() | |
110 | */ | |
111 | ||
112 | int | |
113 | ip_bind(int sock, int af, uschar *address, int port) | |
114 | { | |
115 | int s_len; | |
116 | union sockaddr_46 sin; | |
117 | memset(&sin, 0, sizeof(sin)); | |
118 | ||
119 | /* Setup code when using an IPv6 socket. The wildcard address is ":", to | |
120 | ensure an IPv6 socket is used. */ | |
121 | ||
122 | #if HAVE_IPV6 | |
123 | if (af == AF_INET6) | |
124 | { | |
125 | if (address[0] == ':' && address[1] == 0) | |
126 | { | |
127 | sin.v6.sin6_family = AF_INET6; | |
128 | sin.v6.sin6_addr = in6addr_any; | |
129 | } | |
130 | else | |
131 | { | |
132 | ip_addrinfo(address, &sin.v6); /* Panic-dies on error */ | |
133 | } | |
134 | sin.v6.sin6_port = htons(port); | |
135 | s_len = sizeof(sin.v6); | |
136 | } | |
137 | else | |
138 | #else /* HAVE_IPv6 */ | |
139 | af = af; /* Avoid compiler warning */ | |
140 | #endif /* HAVE_IPV6 */ | |
141 | ||
142 | /* Setup code when using IPv4 socket. The wildcard address is "". */ | |
143 | ||
144 | { | |
145 | sin.v4.sin_family = AF_INET; | |
146 | sin.v4.sin_port = htons(port); | |
147 | s_len = sizeof(sin.v4); | |
148 | if (address[0] == 0) | |
149 | sin.v4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY; | |
150 | else | |
151 | sin.v4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(CS address); | |
152 | } | |
153 | ||
154 | /* Now we can call the bind() function */ | |
155 | ||
156 | return bind(sock, (struct sockaddr *)&sin, s_len); | |
157 | } | |
158 | ||
159 | ||
160 | ||
161 | /************************************************* | |
162 | * Connect socket to remote host * | |
163 | *************************************************/ | |
164 | ||
165 | /* This function connects a socket to a remote address and port. The socket may | |
d515a917 PH |
166 | or may not have previously been bound to a local interface. The socket is not |
167 | closed, even in cases of error. It is expected that the calling function, which | |
168 | created the socket, will be the one that closes it. | |
059ec3d9 PH |
169 | |
170 | Arguments: | |
171 | sock the socket | |
172 | af AF_INET6 or AF_INET for the socket type | |
173 | address the remote address, in text form | |
174 | port the remote port | |
b1f8e4f8 | 175 | timeout a timeout (zero for indefinite timeout) |
059ec3d9 PH |
176 | |
177 | Returns: 0 on success; -1 on failure, with errno set | |
178 | */ | |
179 | ||
180 | int | |
a56cc2b8 | 181 | ip_connect(int sock, int af, const uschar *address, int port, int timeout) |
059ec3d9 PH |
182 | { |
183 | struct sockaddr_in s_in4; | |
184 | struct sockaddr *s_ptr; | |
185 | int s_len, rc, save_errno; | |
186 | ||
187 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ | |
188 | ||
189 | #if HAVE_IPV6 | |
190 | struct sockaddr_in6 s_in6; | |
191 | if (af == AF_INET6) | |
192 | { | |
193 | memset(&s_in6, 0, sizeof(s_in6)); | |
194 | ip_addrinfo(address, &s_in6); /* Panic-dies on error */ | |
195 | s_in6.sin6_port = htons(port); | |
196 | s_ptr = (struct sockaddr *)&s_in6; | |
197 | s_len = sizeof(s_in6); | |
198 | } | |
199 | else | |
200 | #else /* HAVE_IPV6 */ | |
201 | af = af; /* Avoid compiler warning */ | |
202 | #endif /* HAVE_IPV6 */ | |
203 | ||
204 | /* For an IPv4 address, use an IPv4 sockaddr structure, even on a system with | |
205 | IPv6 support. */ | |
206 | ||
207 | { | |
208 | memset(&s_in4, 0, sizeof(s_in4)); | |
209 | s_in4.sin_family = AF_INET; | |
210 | s_in4.sin_port = htons(port); | |
a56cc2b8 | 211 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(CCS address); |
059ec3d9 PH |
212 | s_ptr = (struct sockaddr *)&s_in4; |
213 | s_len = sizeof(s_in4); | |
214 | } | |
215 | ||
216 | /* If no connection timeout is set, just call connect() without setting a | |
217 | timer, thereby allowing the inbuilt OS timeout to operate. */ | |
218 | ||
219 | sigalrm_seen = FALSE; | |
220 | if (timeout > 0) alarm(timeout); | |
221 | rc = connect(sock, s_ptr, s_len); | |
222 | save_errno = errno; | |
223 | alarm(0); | |
224 | ||
225 | /* There is a testing facility for simulating a connection timeout, as I | |
226 | can't think of any other way of doing this. It converts a connection refused | |
75e0e026 | 227 | into a timeout if the timeout is set to 999999. */ |
059ec3d9 PH |
228 | |
229 | if (running_in_test_harness) | |
230 | { | |
75e0e026 | 231 | if (save_errno == ECONNREFUSED && timeout == 999999) |
059ec3d9 PH |
232 | { |
233 | rc = -1; | |
234 | save_errno = EINTR; | |
235 | sigalrm_seen = TRUE; | |
236 | } | |
237 | } | |
238 | ||
239 | /* Success */ | |
240 | ||
241 | if (rc >= 0) return 0; | |
242 | ||
243 | /* A failure whose error code is "Interrupted system call" is in fact | |
244 | an externally applied timeout if the signal handler has been run. */ | |
245 | ||
059ec3d9 PH |
246 | errno = (save_errno == EINTR && sigalrm_seen)? ETIMEDOUT : save_errno; |
247 | return -1; | |
248 | } | |
249 | ||
250 | ||
a6d4c44e TF |
251 | |
252 | /************************************************* | |
253 | * Create connected socket to remote host * | |
254 | *************************************************/ | |
255 | ||
b1f8e4f8 JH |
256 | /* Create a socket and connect to host (name or number, ipv6 ok) |
257 | at one of port-range. | |
a6d4c44e | 258 | |
b1f8e4f8 JH |
259 | Arguments: |
260 | type SOCK_DGRAM or SOCK_STREAM | |
261 | af AF_INET6 or AF_INET for the socket type | |
262 | address the remote address, in text form | |
263 | portlo,porthi the remote port range | |
264 | timeout a timeout | |
265 | connhost if not NULL, host_item filled in with connection details | |
266 | errstr pointer for allocated string on error | |
267 | ||
268 | Return: | |
269 | socket fd, or -1 on failure (having allocated an error string) | |
270 | */ | |
271 | int | |
272 | ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi, | |
273 | int timeout, host_item * connhost, uschar ** errstr) | |
274 | { | |
275 | int namelen, port; | |
276 | host_item shost; | |
277 | host_item *h; | |
278 | int af = 0, fd, fd4 = -1, fd6 = -1; | |
279 | ||
280 | shost.next = NULL; | |
281 | shost.address = NULL; | |
282 | shost.port = portlo; | |
283 | shost.mx = -1; | |
284 | ||
285 | namelen = Ustrlen(hostname); | |
286 | ||
287 | /* Anything enclosed in [] must be an IP address. */ | |
288 | ||
289 | if (hostname[0] == '[' && | |
290 | hostname[namelen - 1] == ']') | |
291 | { | |
292 | uschar * host = string_copy(hostname); | |
293 | host[namelen - 1] = 0; | |
294 | host++; | |
295 | if (string_is_ip_address(host, NULL) == 0) | |
296 | { | |
297 | *errstr = string_sprintf("malformed IP address \"%s\"", hostname); | |
298 | return -1; | |
299 | } | |
300 | shost.name = shost.address = host; | |
301 | } | |
302 | ||
303 | /* Otherwise check for an unadorned IP address */ | |
304 | ||
305 | else if (string_is_ip_address(hostname, NULL) != 0) | |
306 | shost.name = shost.address = string_copy(hostname); | |
307 | ||
308 | /* Otherwise lookup IP address(es) from the name */ | |
309 | ||
310 | else | |
311 | { | |
312 | shost.name = string_copy(hostname); | |
313 | if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, NULL, | |
314 | FALSE) != HOST_FOUND) | |
315 | { | |
316 | *errstr = string_sprintf("no IP address found for host %s", shost.name); | |
317 | return -1; | |
318 | } | |
319 | } | |
320 | ||
321 | /* Try to connect to the server - test each IP till one works */ | |
322 | ||
323 | for (h = &shost; h != NULL; h = h->next) | |
324 | { | |
325 | fd = (Ustrchr(h->address, ':') != 0) | |
a6d4c44e TF |
326 | ? (fd6 < 0) ? (fd6 = ip_socket(type, af = AF_INET6)) : fd6 |
327 | : (fd4 < 0) ? (fd4 = ip_socket(type, af = AF_INET )) : fd4; | |
b1f8e4f8 JH |
328 | |
329 | if (fd < 0) | |
330 | { | |
331 | *errstr = string_sprintf("failed to create socket: %s", strerror(errno)); | |
332 | goto bad; | |
333 | } | |
334 | ||
335 | for(port = portlo; port <= porthi; port++) | |
336 | if (ip_connect(fd, af, h->address, port, timeout) == 0) | |
337 | { | |
338 | if (fd != fd6) close(fd6); | |
339 | if (fd != fd4) close(fd4); | |
8a512ed5 JH |
340 | if (connhost) |
341 | { | |
b1f8e4f8 JH |
342 | h->port = port; |
343 | *connhost = *h; | |
344 | connhost->next = NULL; | |
345 | } | |
346 | return fd; | |
347 | } | |
348 | } | |
349 | ||
a9764ac5 JH |
350 | *errstr = string_sprintf("failed to connect to any address for %s: %s", |
351 | hostname, strerror(errno)); | |
b1f8e4f8 JH |
352 | |
353 | bad: | |
354 | close(fd4); close(fd6); return -1; | |
355 | } | |
356 | ||
059ec3d9 | 357 | |
3e60dd41 JH |
358 | int |
359 | ip_tcpsocket(const uschar * hostport, uschar ** errstr, int tmo) | |
360 | { | |
361 | int scan; | |
362 | uschar hostname[256]; | |
363 | unsigned int portlow, porthigh; | |
364 | ||
365 | /* extract host and port part */ | |
366 | scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh); | |
367 | if ( scan != 3 ) { | |
368 | if ( scan != 2 ) { | |
369 | *errstr = string_sprintf("invalid socket '%s'", hostport); | |
370 | return -1; | |
371 | } | |
372 | porthigh = portlow; | |
373 | } | |
374 | ||
375 | return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh, | |
376 | tmo, NULL, errstr); | |
377 | } | |
378 | ||
379 | int | |
380 | ip_unixsocket(const uschar * path, uschar ** errstr) | |
381 | { | |
382 | int sock; | |
383 | struct sockaddr_un server; | |
384 | ||
385 | if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
386 | *errstr = US"can't open UNIX socket."; | |
387 | return -1; | |
388 | } | |
389 | ||
390 | server.sun_family = AF_UNIX; | |
391 | Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1); | |
392 | server.sun_path[sizeof(server.sun_path)-1] = '\0'; | |
393 | if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) { | |
394 | int err = errno; | |
395 | (void)close(sock); | |
396 | *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s", | |
397 | path, strerror(err)); | |
398 | return -1; | |
399 | } | |
400 | return sock; | |
401 | } | |
402 | ||
403 | int | |
404 | ip_streamsocket(const uschar * spec, uschar ** errstr, int tmo) | |
405 | { | |
406 | return *spec == '/' | |
407 | ? ip_unixsocket(spec, errstr) : ip_tcpsocket(spec, errstr, tmo); | |
408 | } | |
409 | ||
059ec3d9 PH |
410 | /************************************************* |
411 | * Set keepalive on a socket * | |
412 | *************************************************/ | |
413 | ||
414 | /* Can be called for both incoming and outgoing sockets. | |
415 | ||
416 | Arguments: | |
417 | sock the socket | |
418 | address the remote host address, for failure logging | |
419 | torf true for outgoing connection, false for incoming | |
420 | ||
421 | Returns: nothing | |
422 | */ | |
423 | ||
424 | void | |
55414b25 | 425 | ip_keepalive(int sock, const uschar *address, BOOL torf) |
059ec3d9 PH |
426 | { |
427 | int fodder = 1; | |
428 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
429 | (uschar *)(&fodder), sizeof(fodder)) != 0) | |
430 | log_write(0, LOG_MAIN, "setsockopt(SO_KEEPALIVE) on connection %s %s " | |
431 | "failed: %s", torf? "to":"from", address, strerror(errno)); | |
432 | } | |
433 | ||
434 | ||
435 | ||
436 | /************************************************* | |
437 | * Receive from a socket with timeout * | |
438 | *************************************************/ | |
439 | ||
4e71661f | 440 | /* |
059ec3d9 | 441 | Arguments: |
4e71661f JH |
442 | fd the file descriptor |
443 | timeout the timeout, seconds | |
444 | Returns: TRUE => ready for i/o | |
445 | FALSE => timed out, or other error | |
059ec3d9 | 446 | */ |
4e71661f JH |
447 | BOOL |
448 | fd_ready(int fd, int timeout) | |
059ec3d9 PH |
449 | { |
450 | fd_set select_inset; | |
451 | struct timeval tv; | |
19050083 | 452 | time_t start_recv = time(NULL); |
059ec3d9 PH |
453 | int rc; |
454 | ||
4e71661f JH |
455 | if (timeout <= 0) |
456 | { | |
457 | errno = ETIMEDOUT; | |
458 | return FALSE; | |
459 | } | |
059ec3d9 PH |
460 | /* Wait until the socket is ready */ |
461 | ||
462 | for (;;) | |
463 | { | |
464 | FD_ZERO (&select_inset); | |
4e71661f | 465 | FD_SET (fd, &select_inset); |
059ec3d9 PH |
466 | tv.tv_sec = timeout; |
467 | tv.tv_usec = 0; | |
468 | ||
0f0c8159 | 469 | /*DEBUG(D_transport) debug_printf("waiting for data on fd\n");*/ |
4e71661f | 470 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&select_inset, NULL, NULL, &tv); |
059ec3d9 PH |
471 | |
472 | /* If some interrupt arrived, just retry. We presume this to be rare, | |
473 | but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes | |
474 | select() to exit). | |
475 | ||
476 | Aug 2004: Somebody set up a cron job that ran exiwhat every 2 minutes, making | |
477 | the interrupt not at all rare. Since the timeout is typically more than 2 | |
478 | minutes, the effect was to block the timeout completely. To prevent this | |
479 | happening again, we do an explicit time test. */ | |
480 | ||
481 | if (rc < 0 && errno == EINTR) | |
482 | { | |
483 | DEBUG(D_transport) debug_printf("EINTR while waiting for socket data\n"); | |
484 | if (time(NULL) - start_recv < timeout) continue; | |
485 | DEBUG(D_transport) debug_printf("total wait time exceeds timeout\n"); | |
486 | } | |
487 | ||
488 | /* Handle a timeout, and treat any other select error as a timeout, including | |
489 | an EINTR when we have been in this loop for longer than timeout. */ | |
490 | ||
491 | if (rc <= 0) | |
492 | { | |
493 | errno = ETIMEDOUT; | |
4e71661f | 494 | return FALSE; |
059ec3d9 PH |
495 | } |
496 | ||
497 | /* If the socket is ready, break out of the loop. */ | |
498 | ||
4e71661f | 499 | if (FD_ISSET(fd, &select_inset)) break; |
059ec3d9 | 500 | } |
4e71661f JH |
501 | return TRUE; |
502 | } | |
503 | ||
504 | /* The timeout is implemented using select(), and we loop to cover select() | |
505 | getting interrupted, and the possibility of select() returning with a positive | |
506 | result but no ready descriptor. Is this in fact possible? | |
507 | ||
508 | Arguments: | |
509 | sock the socket | |
510 | buffer to read into | |
511 | bufsize the buffer size | |
512 | timeout the timeout | |
513 | ||
514 | Returns: > 0 => that much data read | |
515 | <= 0 on error or EOF; errno set - zero for EOF | |
516 | */ | |
517 | ||
518 | int | |
519 | ip_recv(int sock, uschar *buffer, int buffsize, int timeout) | |
520 | { | |
521 | int rc; | |
522 | ||
523 | if (!fd_ready(sock, timeout)) | |
524 | return -1; | |
059ec3d9 PH |
525 | |
526 | /* The socket is ready, read from it (via TLS if it's active). On EOF (i.e. | |
527 | close down of the connection), set errno to zero; otherwise leave it alone. */ | |
528 | ||
529 | #ifdef SUPPORT_TLS | |
817d9f57 JH |
530 | if (tls_out.active == sock) |
531 | rc = tls_read(FALSE, buffer, buffsize); | |
532 | else if (tls_in.active == sock) | |
533 | rc = tls_read(TRUE, buffer, buffsize); | |
059ec3d9 PH |
534 | else |
535 | #endif | |
536 | rc = recv(sock, buffer, buffsize, 0); | |
537 | ||
538 | if (rc > 0) return rc; | |
539 | if (rc == 0) errno = 0; | |
540 | return -1; | |
541 | } | |
542 | ||
543 | ||
9e4f5962 PP |
544 | |
545 | ||
13363eba PP |
546 | /************************************************* |
547 | * Lookup address family of potential socket * | |
548 | *************************************************/ | |
549 | ||
550 | /* Given a file-descriptor, check to see if it's a socket and, if so, | |
551 | return the address family; detects IPv4 vs IPv6. If not a socket then | |
552 | return -1. | |
553 | ||
554 | The value 0 is typically AF_UNSPEC, which should not be seen on a connected | |
555 | fd. If the return is -1, the errno will be from getsockname(); probably | |
556 | ENOTSOCK or ECONNRESET. | |
557 | ||
558 | Arguments: socket-or-not fd | |
559 | Returns: address family or -1 | |
560 | */ | |
561 | ||
562 | int | |
563 | ip_get_address_family(int fd) | |
564 | { | |
565 | struct sockaddr_storage ss; | |
566 | socklen_t sslen = sizeof(ss); | |
567 | ||
568 | if (getsockname(fd, (struct sockaddr *) &ss, &sslen) < 0) | |
569 | return -1; | |
570 | ||
571 | return (int) ss.ss_family; | |
572 | } | |
573 | ||
574 | ||
575 | ||
576 | ||
9e4f5962 PP |
577 | /************************************************* |
578 | * Lookup DSCP settings for a socket * | |
579 | *************************************************/ | |
580 | ||
581 | struct dscp_name_tableentry { | |
582 | const uschar *name; | |
583 | int value; | |
584 | }; | |
585 | /* Keep both of these tables sorted! */ | |
586 | static struct dscp_name_tableentry dscp_table[] = { | |
587 | #ifdef IPTOS_DSCP_AF11 | |
36a3ae5f PP |
588 | { CUS"af11", IPTOS_DSCP_AF11 }, |
589 | { CUS"af12", IPTOS_DSCP_AF12 }, | |
590 | { CUS"af13", IPTOS_DSCP_AF13 }, | |
591 | { CUS"af21", IPTOS_DSCP_AF21 }, | |
592 | { CUS"af22", IPTOS_DSCP_AF22 }, | |
593 | { CUS"af23", IPTOS_DSCP_AF23 }, | |
594 | { CUS"af31", IPTOS_DSCP_AF31 }, | |
595 | { CUS"af32", IPTOS_DSCP_AF32 }, | |
596 | { CUS"af33", IPTOS_DSCP_AF33 }, | |
597 | { CUS"af41", IPTOS_DSCP_AF41 }, | |
598 | { CUS"af42", IPTOS_DSCP_AF42 }, | |
599 | { CUS"af43", IPTOS_DSCP_AF43 }, | |
600 | { CUS"ef", IPTOS_DSCP_EF }, | |
9e4f5962 PP |
601 | #endif |
602 | #ifdef IPTOS_LOWCOST | |
36a3ae5f | 603 | { CUS"lowcost", IPTOS_LOWCOST }, |
9e4f5962 | 604 | #endif |
36a3ae5f | 605 | { CUS"lowdelay", IPTOS_LOWDELAY }, |
9e4f5962 | 606 | #ifdef IPTOS_MINCOST |
36a3ae5f | 607 | { CUS"mincost", IPTOS_MINCOST }, |
9e4f5962 | 608 | #endif |
36a3ae5f PP |
609 | { CUS"reliability", IPTOS_RELIABILITY }, |
610 | { CUS"throughput", IPTOS_THROUGHPUT } | |
9e4f5962 PP |
611 | }; |
612 | static int dscp_table_size = | |
613 | sizeof(dscp_table) / sizeof(struct dscp_name_tableentry); | |
614 | ||
615 | /* DSCP values change by protocol family, and so do the options used for | |
2a1b36b3 PP |
616 | setsockopt(); this utility does all the lookups. It takes an unexpanded |
617 | option string, expands it, strips off affix whitespace, then checks if it's | |
618 | a number. If all of what's left is a number, then that's how the option will | |
619 | be parsed and success/failure is a range check. If it's not all a number, | |
620 | then it must be a supported keyword. | |
9e4f5962 PP |
621 | |
622 | Arguments: | |
623 | dscp_name a string, so far unvalidated | |
624 | af address_family in use | |
625 | level setsockopt level to use | |
626 | optname setsockopt name to use | |
627 | dscp_value value for dscp_name | |
628 | ||
629 | Returns: TRUE if okay to setsockopt(), else FALSE | |
2a1b36b3 PP |
630 | |
631 | *level and *optname may be set even if FALSE is returned | |
9e4f5962 PP |
632 | */ |
633 | ||
634 | BOOL | |
635 | dscp_lookup(const uschar *dscp_name, int af, | |
636 | int *level, int *optname, int *dscp_value) | |
637 | { | |
2a1b36b3 | 638 | uschar *dscp_lookup, *p; |
9e4f5962 | 639 | int first, last; |
2a1b36b3 | 640 | long rawlong; |
9e4f5962 PP |
641 | |
642 | if (af == AF_INET) | |
643 | { | |
644 | *level = IPPROTO_IP; | |
645 | *optname = IP_TOS; | |
646 | } | |
bb7b9411 | 647 | #if HAVE_IPV6 && defined(IPV6_TCLASS) |
9e4f5962 PP |
648 | else if (af == AF_INET6) |
649 | { | |
650 | *level = IPPROTO_IPV6; | |
651 | *optname = IPV6_TCLASS; | |
652 | } | |
b301a50b | 653 | #endif |
9e4f5962 PP |
654 | else |
655 | { | |
656 | DEBUG(D_transport) | |
657 | debug_printf("Unhandled address family %d in dscp_lookup()\n", af); | |
658 | return FALSE; | |
659 | } | |
660 | if (!dscp_name) | |
661 | { | |
662 | DEBUG(D_transport) | |
663 | debug_printf("[empty DSCP]\n"); | |
664 | return FALSE; | |
665 | } | |
666 | dscp_lookup = expand_string(US dscp_name); | |
667 | if (dscp_lookup == NULL || *dscp_lookup == '\0') | |
668 | return FALSE; | |
669 | ||
2a1b36b3 PP |
670 | p = dscp_lookup + Ustrlen(dscp_lookup) - 1; |
671 | while (isspace(*p)) *p-- = '\0'; | |
672 | while (isspace(*dscp_lookup) && dscp_lookup < p) dscp_lookup++; | |
673 | if (*dscp_lookup == '\0') | |
674 | return FALSE; | |
675 | ||
676 | rawlong = Ustrtol(dscp_lookup, &p, 0); | |
677 | if (p != dscp_lookup && *p == '\0') | |
678 | { | |
679 | /* We have six bits available, which will end up shifted to fit in 0xFC mask. | |
680 | RFC 2597 defines the values unshifted. */ | |
681 | if (rawlong < 0 || rawlong > 0x3F) | |
682 | { | |
683 | DEBUG(D_transport) | |
684 | debug_printf("DSCP value %ld out of range, ignored.\n", rawlong); | |
685 | return FALSE; | |
686 | } | |
687 | *dscp_value = rawlong << 2; | |
688 | return TRUE; | |
689 | } | |
690 | ||
9e4f5962 PP |
691 | first = 0; |
692 | last = dscp_table_size; | |
693 | while (last > first) | |
694 | { | |
695 | int middle = (first + last)/2; | |
696 | int c = Ustrcmp(dscp_lookup, dscp_table[middle].name); | |
697 | if (c == 0) | |
698 | { | |
699 | *dscp_value = dscp_table[middle].value; | |
700 | return TRUE; | |
701 | } | |
702 | else if (c > 0) | |
703 | { | |
704 | first = middle + 1; | |
705 | } | |
706 | else | |
707 | { | |
708 | last = middle; | |
709 | } | |
710 | } | |
711 | return FALSE; | |
712 | } | |
713 | ||
36a3ae5f PP |
714 | void |
715 | dscp_list_to_stream(FILE *stream) | |
716 | { | |
717 | int i; | |
718 | for (i=0; i < dscp_table_size; ++i) | |
719 | fprintf(stream, "%s\n", dscp_table[i].name); | |
720 | } | |
721 | ||
9e4f5962 | 722 | |
059ec3d9 | 723 | /* End of ip.c */ |
8a512ed5 JH |
724 | /* vi: aw ai sw=2 |
725 | */ |