Commit | Line | Data |
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7c1b4daa | 1 | /* -*- c-file-style: "linux" -*- |
9c07d253 | 2 | |
d54765c4 | 3 | rsync -- fast file replication program |
9c07d253 | 4 | |
eecd22ff | 5 | Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org> |
362099a5 | 6 | Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> |
9c07d253 | 7 | |
bc2e93eb AT |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
9c07d253 | 12 | |
bc2e93eb AT |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
9c07d253 | 17 | |
bc2e93eb AT |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
d5d4b282 MP |
23 | /** |
24 | * @file socket.c | |
9c07d253 | 25 | * |
d5d4b282 | 26 | * Socket functions used in rsync. |
362099a5 MP |
27 | * |
28 | * This file is now converted to use the new-style getaddrinfo() | |
29 | * interface, which supports IPv6 but is also supported on recent | |
30 | * IPv4-only machines. On systems that don't have that interface, we | |
31 | * emulate it using the KAME implementation. | |
d5d4b282 | 32 | **/ |
bc2e93eb | 33 | |
f0fca04e AT |
34 | #include "rsync.h" |
35 | ||
2c7d63c7 WD |
36 | extern char *bind_address; |
37 | extern int default_af_hint; | |
9a5a8673 | 38 | |
44e604f4 | 39 | #ifdef HAVE_SIGACTION |
2b28968d WD |
40 | static struct sigaction sigact; |
41 | #endif | |
42 | ||
a7dc44d2 MP |
43 | /** |
44 | * Establish a proxy connection on an open socket to a web proxy by | |
a3a84107 WD |
45 | * using the CONNECT method. If proxy_user and proxy_pass are not NULL, |
46 | * they are used to authenticate to the proxy using the "Basic" | |
47 | * proxy-authorization protocol | |
a7dc44d2 | 48 | **/ |
a3a84107 WD |
49 | static int establish_proxy_connection(int fd, char *host, int port, |
50 | char *proxy_user, char *proxy_pass) | |
4c3b4b25 | 51 | { |
a3a84107 WD |
52 | char *cp, buffer[1024]; |
53 | char *authhdr, authbuf[1024]; | |
54 | int len; | |
55 | ||
56 | if (proxy_user && proxy_pass) { | |
893c4cc0 WD |
57 | stringjoin(buffer, sizeof buffer, |
58 | proxy_user, ":", proxy_pass, NULL); | |
a3a84107 | 59 | len = strlen(buffer); |
4c3b4b25 | 60 | |
173f5bf8 | 61 | if ((len*8 + 5) / 6 >= (int)sizeof authbuf) { |
a3a84107 WD |
62 | rprintf(FERROR, |
63 | "authentication information is too long\n"); | |
64 | return -1; | |
65 | } | |
66 | ||
67 | base64_encode(buffer, len, authbuf); | |
68 | authhdr = "\r\nProxy-Authorization: Basic "; | |
69 | } else { | |
70 | *authbuf = '\0'; | |
71 | authhdr = ""; | |
72 | } | |
73 | ||
74 | snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", | |
75 | host, port, authhdr, authbuf); | |
76 | len = strlen(buffer); | |
77 | if (write(fd, buffer, len) != len) { | |
d62bcc17 | 78 | rsyserr(FERROR, errno, "failed to write to proxy"); |
4c3b4b25 AT |
79 | return -1; |
80 | } | |
81 | ||
a3a84107 | 82 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 83 | if (read(fd, cp, 1) != 1) { |
d62bcc17 | 84 | rsyserr(FERROR, errno, "failed to read from proxy"); |
4c3b4b25 AT |
85 | return -1; |
86 | } | |
87 | if (*cp == '\n') | |
88 | break; | |
89 | } | |
90 | ||
91 | if (*cp != '\n') | |
92 | cp++; | |
93 | *cp-- = '\0'; | |
94 | if (*cp == '\r') | |
95 | *cp = '\0'; | |
96 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
4ccfd96c | 97 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
98 | buffer); |
99 | return -1; | |
100 | } | |
9c07d253 | 101 | for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {} |
4c3b4b25 AT |
102 | while (*cp == ' ') |
103 | cp++; | |
104 | if (*cp != '2') { | |
4ccfd96c | 105 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
106 | buffer); |
107 | return -1; | |
108 | } | |
109 | /* throw away the rest of the HTTP header */ | |
110 | while (1) { | |
a3a84107 | 111 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 112 | if (read(fd, cp, 1) != 1) { |
d62bcc17 WD |
113 | rsyserr(FERROR, errno, |
114 | "failed to read from proxy"); | |
4c3b4b25 AT |
115 | return -1; |
116 | } | |
117 | if (*cp == '\n') | |
118 | break; | |
119 | } | |
9c07d253 | 120 | if (cp > buffer && *cp == '\n') |
4c3b4b25 | 121 | cp--; |
9c07d253 | 122 | if (cp == buffer && (*cp == '\n' || *cp == '\r')) |
4c3b4b25 AT |
123 | break; |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
128 | ||
f8be7d42 MP |
129 | /** |
130 | * Try to set the local address for a newly-created socket. Return -1 | |
131 | * if this fails. | |
132 | **/ | |
e028b9ff | 133 | int try_bind_local(int s, int ai_family, int ai_socktype, |
4313d6f9 | 134 | const char *bind_addr) |
f8be7d42 MP |
135 | { |
136 | int error; | |
137 | struct addrinfo bhints, *bres_all, *r; | |
138 | ||
a3a84107 | 139 | memset(&bhints, 0, sizeof bhints); |
f8be7d42 MP |
140 | bhints.ai_family = ai_family; |
141 | bhints.ai_socktype = ai_socktype; | |
142 | bhints.ai_flags = AI_PASSIVE; | |
4313d6f9 | 143 | if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) { |
f8be7d42 | 144 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
4313d6f9 | 145 | bind_addr, gai_strerror(error)); |
f8be7d42 MP |
146 | return -1; |
147 | } | |
148 | ||
149 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 150 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 151 | continue; |
6b2d24de | 152 | freeaddrinfo(bres_all); |
f8be7d42 MP |
153 | return s; |
154 | } | |
155 | ||
156 | /* no error message; there might be some problem that allows | |
157 | * creation of the socket but not binding, perhaps if the | |
158 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 159 | freeaddrinfo(bres_all); |
f8be7d42 MP |
160 | return -1; |
161 | } | |
162 | ||
eecd22ff | 163 | |
d5d4b282 MP |
164 | /** |
165 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 166 | * |
d5d4b282 MP |
167 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
168 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 169 | * |
d5d4b282 MP |
170 | * Now that we support IPv6 we need to look up the remote machine's |
171 | * address first, using @p af_hint to set a preference for the type | |
172 | * of address. Then depending on whether it has v4 or v6 addresses we | |
173 | * try to open a connection. | |
06963d0f | 174 | * |
d5d4b282 MP |
175 | * The loop allows for machines with some addresses which may not be |
176 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
177 | * but we can get ip4 packets through. | |
178 | * | |
4313d6f9 | 179 | * @param bind_addr Local address to use. Normally NULL to bind |
d5d4b282 MP |
180 | * the wildcard address. |
181 | * | |
182 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 183 | **/ |
4313d6f9 | 184 | int open_socket_out(char *host, int port, const char *bind_addr, |
d5d4b282 | 185 | int af_hint) |
bc2e93eb | 186 | { |
f0fca04e | 187 | int type = SOCK_STREAM; |
a3a84107 | 188 | int error, s; |
06963d0f MP |
189 | struct addrinfo hints, *res0, *res; |
190 | char portbuf[10]; | |
a3a84107 | 191 | char *h, *cp; |
4c3b4b25 AT |
192 | int proxied = 0; |
193 | char buffer[1024]; | |
a3a84107 | 194 | char *proxy_user = NULL, *proxy_pass = NULL; |
4c3b4b25 | 195 | |
660c6fbd | 196 | /* if we have a RSYNC_PROXY env variable then redirect our |
a3a84107 | 197 | * connetcion via a web proxy at the given address. */ |
4c3b4b25 | 198 | h = getenv("RSYNC_PROXY"); |
9c07d253 | 199 | proxied = h != NULL && *h != '\0'; |
4c3b4b25 AT |
200 | |
201 | if (proxied) { | |
a3a84107 WD |
202 | strlcpy(buffer, h, sizeof buffer); |
203 | ||
204 | /* Is the USER:PASS@ prefix present? */ | |
b31c92ed | 205 | if ((cp = strrchr(buffer, '@')) != NULL) { |
a3a84107 WD |
206 | *cp++ = '\0'; |
207 | /* The remainder is the HOST:PORT part. */ | |
208 | h = cp; | |
209 | ||
210 | if ((cp = strchr(buffer, ':')) == NULL) { | |
211 | rprintf(FERROR, | |
212 | "invalid proxy specification: should be USER:PASS@HOST:PORT\n"); | |
213 | return -1; | |
214 | } | |
215 | *cp++ = '\0'; | |
216 | ||
217 | proxy_user = buffer; | |
218 | proxy_pass = cp; | |
219 | } else { | |
220 | /* The whole buffer is the HOST:PORT part. */ | |
221 | h = buffer; | |
222 | } | |
223 | ||
224 | if ((cp = strchr(h, ':')) == NULL) { | |
660c6fbd MP |
225 | rprintf(FERROR, |
226 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
227 | return -1; |
228 | } | |
229 | *cp++ = '\0'; | |
a3a84107 | 230 | strlcpy(portbuf, cp, sizeof portbuf); |
7bea78ce MP |
231 | if (verbose >= 2) { |
232 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
233 | h, portbuf); | |
234 | } | |
4c3b4b25 | 235 | } else { |
a3a84107 | 236 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4c3b4b25 | 237 | h = host; |
4c3b4b25 | 238 | } |
f0fca04e | 239 | |
a3a84107 | 240 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 241 | hints.ai_family = af_hint; |
06963d0f MP |
242 | hints.ai_socktype = type; |
243 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
244 | if (error) { | |
d5d4b282 MP |
245 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
246 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
247 | return -1; |
248 | } | |
249 | ||
06963d0f | 250 | s = -1; |
2d6dbe29 MP |
251 | /* Try to connect to all addresses for this machine until we get |
252 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
253 | * addresses. We need to create a socket for each record, since the | |
254 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
255 | for (res = res0; res; res = res->ai_next) { |
256 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
257 | if (s < 0) | |
258 | continue; | |
f0fca04e | 259 | |
4313d6f9 | 260 | if (bind_addr |
a3a84107 | 261 | && try_bind_local(s, res->ai_family, type, |
4313d6f9 | 262 | bind_addr) == -1) { |
a3a84107 WD |
263 | close(s); |
264 | s = -1; | |
265 | continue; | |
266 | } | |
06963d0f MP |
267 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
268 | close(s); | |
269 | s = -1; | |
270 | continue; | |
271 | } | |
a3a84107 WD |
272 | if (proxied |
273 | && establish_proxy_connection(s, host, port, | |
274 | proxy_user, proxy_pass) != 0) { | |
06963d0f MP |
275 | close(s); |
276 | s = -1; | |
277 | continue; | |
a3a84107 WD |
278 | } |
279 | break; | |
4c3b4b25 | 280 | } |
06963d0f MP |
281 | freeaddrinfo(res0); |
282 | if (s < 0) { | |
d62bcc17 | 283 | rsyserr(FERROR, errno, "failed to connect to %s", h); |
f0fca04e AT |
284 | return -1; |
285 | } | |
06963d0f | 286 | return s; |
f0fca04e AT |
287 | } |
288 | ||
289 | ||
eecd22ff MP |
290 | /** |
291 | * Open an outgoing socket, but allow for it to be intercepted by | |
292 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
293 | * socketpair rather than really opening a socket. | |
294 | * | |
295 | * We use this primarily in testing to detect TCP flow bugs, but not | |
296 | * cause security problems by really opening remote connections. | |
297 | * | |
298 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f | 299 | * |
4313d6f9 | 300 | * @param bind_addr Local address to use. Normally NULL to get the stack default. |
eecd22ff | 301 | **/ |
4313d6f9 | 302 | int open_socket_out_wrapped(char *host, int port, const char *bind_addr, |
9c07d253 | 303 | int af_hint) |
eecd22ff | 304 | { |
df5cd107 | 305 | char *prog = getenv("RSYNC_CONNECT_PROG"); |
eecd22ff | 306 | |
df5cd107 WD |
307 | if (verbose >= 2) { |
308 | rprintf(FINFO, "%sopening tcp connection to %s port %d\n", | |
309 | prog ? "Using RSYNC_CONNECT_PROG instead of " : "", | |
310 | host, port); | |
311 | } | |
312 | if (prog) | |
9c07d253 | 313 | return sock_exec(prog); |
4313d6f9 | 314 | return open_socket_out(host, port, bind_addr, af_hint); |
eecd22ff MP |
315 | } |
316 | ||
317 | ||
318 | ||
06963d0f | 319 | /** |
2c7d63c7 WD |
320 | * Open one or more sockets for incoming data using the specified type, |
321 | * port, and address. | |
06963d0f | 322 | * |
2c7d63c7 WD |
323 | * The getaddrinfo() call may return several address results, e.g. for |
324 | * the machine's IPv4 and IPv6 name. | |
9c07d253 | 325 | * |
2c7d63c7 WD |
326 | * We return an array of file-descriptors to the sockets, with a trailing |
327 | * -1 value to indicate the end of the list. | |
9c07d253 | 328 | * |
4313d6f9 | 329 | * @param bind_addr Local address to bind, or NULL to allow it to |
06963d0f MP |
330 | * default. |
331 | **/ | |
4313d6f9 | 332 | static int *open_socket_in(int type, int port, const char *bind_addr, |
b0fd253a | 333 | int af_hint) |
f0fca04e | 334 | { |
2c7d63c7 WD |
335 | int one = 1; |
336 | int s, *socks, maxs, i; | |
13e29995 | 337 | struct addrinfo hints, *all_ai, *resp; |
06963d0f MP |
338 | char portbuf[10]; |
339 | int error; | |
340 | ||
a3a84107 | 341 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 342 | hints.ai_family = af_hint; |
06963d0f MP |
343 | hints.ai_socktype = type; |
344 | hints.ai_flags = AI_PASSIVE; | |
a3a84107 | 345 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4313d6f9 | 346 | error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); |
06963d0f | 347 | if (error) { |
7ef6aa64 | 348 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
4313d6f9 | 349 | bind_addr, gai_strerror(error)); |
b0fd253a WD |
350 | return NULL; |
351 | } | |
352 | ||
353 | /* Count max number of sockets we might open. */ | |
354 | for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} | |
2c7d63c7 WD |
355 | |
356 | if (!(socks = new_array(int, maxs + 1))) | |
357 | out_of_memory("open_socket_in"); | |
06963d0f | 358 | |
13e29995 MP |
359 | /* We may not be able to create the socket, if for example the |
360 | * machine knows about IPv6 in the C library, but not in the | |
361 | * kernel. */ | |
2c7d63c7 | 362 | for (resp = all_ai, i = 0; resp; resp = resp->ai_next) { |
13e29995 MP |
363 | s = socket(resp->ai_family, resp->ai_socktype, |
364 | resp->ai_protocol); | |
365 | ||
b0fd253a | 366 | if (s == -1) { |
13e29995 MP |
367 | /* See if there's another address that will work... */ |
368 | continue; | |
b0fd253a | 369 | } |
9c07d253 | 370 | |
13e29995 MP |
371 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
372 | (char *)&one, sizeof one); | |
9c07d253 | 373 | |
b0fd253a WD |
374 | #ifdef IPV6_V6ONLY |
375 | if (resp->ai_family == AF_INET6) { | |
dcd08dc5 WD |
376 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, |
377 | (char *)&one, sizeof one) < 0 | |
378 | && default_af_hint != AF_INET6) { | |
379 | close(s); | |
380 | continue; | |
381 | } | |
b0fd253a WD |
382 | } |
383 | #endif | |
384 | ||
e028b9ff WD |
385 | /* Now we've got a socket - we need to bind it. */ |
386 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 MP |
387 | /* Nope, try another */ |
388 | close(s); | |
389 | continue; | |
b8771f96 | 390 | } |
e23d790f | 391 | |
2c7d63c7 | 392 | socks[i++] = s; |
f0fca04e | 393 | } |
2c7d63c7 | 394 | socks[i] = -1; |
f0fca04e | 395 | |
b0fd253a WD |
396 | if (all_ai) |
397 | freeaddrinfo(all_ai); | |
b8771f96 | 398 | |
2c7d63c7 | 399 | if (!i) { |
b0fd253a | 400 | rprintf(FERROR, |
2c7d63c7 WD |
401 | "unable to bind any inbound sockets on port %d\n", |
402 | port); | |
b0fd253a WD |
403 | free(socks); |
404 | return NULL; | |
405 | } | |
406 | return socks; | |
f0fca04e AT |
407 | } |
408 | ||
409 | ||
7c1b4daa MP |
410 | /* |
411 | * Determine if a file descriptor is in fact a socket | |
412 | */ | |
f0fca04e AT |
413 | int is_a_socket(int fd) |
414 | { | |
ac2a1a44 | 415 | int v; |
a3a84107 WD |
416 | socklen_t l = sizeof (int); |
417 | ||
418 | /* Parameters to getsockopt, setsockopt etc are very | |
419 | * unstandardized across platforms, so don't be surprised if | |
420 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. | |
421 | * It seems they all eventually get the right idea. | |
422 | * | |
423 | * Debian says: ``The fifth argument of getsockopt and | |
424 | * setsockopt is in reality an int [*] (and this is what BSD | |
425 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
426 | * resulted in the present socklen_t. The draft standard has | |
427 | * not been adopted yet, but glibc2 already follows it and | |
428 | * also has socklen_t [*]. See also accept(2).'' | |
429 | * | |
430 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 431 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
432 | } |
433 | ||
434 | ||
067669da WD |
435 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
436 | { | |
ca20c7fd WD |
437 | #ifdef WNOHANG |
438 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
439 | #endif | |
44e604f4 | 440 | #ifndef HAVE_SIGACTION |
cb984e62 | 441 | signal(SIGCHLD, sigchld_handler); |
2b28968d | 442 | #endif |
ca20c7fd WD |
443 | } |
444 | ||
445 | ||
39993af5 | 446 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e | 447 | { |
b0fd253a | 448 | fd_set deffds; |
d8d36af4 | 449 | int *sp, maxfd, i; |
f0fca04e | 450 | |
44e604f4 | 451 | #ifdef HAVE_SIGACTION |
2b28968d WD |
452 | sigact.sa_flags = SA_NOCLDSTOP; |
453 | #endif | |
454 | ||
f0fca04e | 455 | /* open an incoming socket */ |
b0fd253a WD |
456 | sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
457 | if (sp == NULL) | |
65417579 | 458 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
459 | |
460 | /* ready to listen */ | |
b0fd253a | 461 | FD_ZERO(&deffds); |
2c7d63c7 WD |
462 | for (i = 0, maxfd = -1; sp[i] >= 0; i++) { |
463 | if (listen(sp[i], 5) < 0) { | |
d62bcc17 | 464 | rsyserr(FERROR, errno, "listen() on socket failed"); |
4f5b0756 | 465 | #ifdef INET6 |
2c7d63c7 WD |
466 | if (errno == EADDRINUSE && i > 0) { |
467 | rprintf(FINFO, | |
880570f2 | 468 | "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); |
2c7d63c7 WD |
469 | } |
470 | #endif | |
b0fd253a WD |
471 | exit_cleanup(RERR_SOCKETIO); |
472 | } | |
473 | FD_SET(sp[i], &deffds); | |
474 | if (maxfd < sp[i]) | |
475 | maxfd = sp[i]; | |
f0fca04e AT |
476 | } |
477 | ||
f0fca04e | 478 | /* now accept incoming connections - forking a new process |
a3a84107 | 479 | * for each incoming connection */ |
f0fca04e AT |
480 | while (1) { |
481 | fd_set fds; | |
c4a5c57d | 482 | pid_t pid; |
f0fca04e | 483 | int fd; |
2d6dbe29 | 484 | struct sockaddr_storage addr; |
d54765c4 | 485 | socklen_t addrlen = sizeof addr; |
f0fca04e | 486 | |
15b84e14 | 487 | /* close log file before the potentially very long select so |
a3a84107 WD |
488 | * file can be trimmed by another process instead of growing |
489 | * forever */ | |
8ee6adef | 490 | logfile_close(); |
45a83540 | 491 | |
b0fd253a WD |
492 | #ifdef FD_COPY |
493 | FD_COPY(&deffds, &fds); | |
494 | #else | |
495 | fds = deffds; | |
496 | #endif | |
f0fca04e | 497 | |
b0fd253a | 498 | if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) |
9c07d253 | 499 | continue; |
f0fca04e | 500 | |
2c7d63c7 | 501 | for (i = 0, fd = -1; sp[i] >= 0; i++) { |
b0fd253a WD |
502 | if (FD_ISSET(sp[i], &fds)) { |
503 | fd = accept(sp[i], (struct sockaddr *)&addr, | |
504 | &addrlen); | |
505 | break; | |
506 | } | |
507 | } | |
f0fca04e | 508 | |
b0fd253a | 509 | if (fd < 0) |
9c07d253 | 510 | continue; |
f0fca04e | 511 | |
2b28968d | 512 | SIGACTION(SIGCHLD, sigchld_handler); |
31f440e6 | 513 | |
c4a5c57d | 514 | if ((pid = fork()) == 0) { |
9f639210 | 515 | int ret; |
2c7d63c7 WD |
516 | for (i = 0; sp[i] >= 0; i++) |
517 | close(sp[i]); | |
1da05366 | 518 | /* Re-open log file in child before possibly giving |
8ee6adef WD |
519 | * up privileges (see logfile_close() above). */ |
520 | logfile_reopen(); | |
9f639210 DD |
521 | ret = fn(fd, fd); |
522 | close_all(); | |
523 | _exit(ret); | |
c4a5c57d | 524 | } else if (pid < 0) { |
d62bcc17 WD |
525 | rsyserr(FERROR, errno, |
526 | "could not create child server process"); | |
c4a5c57d MP |
527 | close(fd); |
528 | /* This might have happened because we're | |
529 | * overloaded. Sleep briefly before trying to | |
530 | * accept again. */ | |
531 | sleep(2); | |
bd37c666 | 532 | } else { |
79845f28 | 533 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 534 | close(fd); |
f0fca04e | 535 | } |
f0fca04e | 536 | } |
f0fca04e AT |
537 | } |
538 | ||
539 | ||
540 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
541 | ||
542 | struct | |
543 | { | |
544 | char *name; | |
545 | int level; | |
546 | int option; | |
547 | int value; | |
548 | int opttype; | |
549 | } socket_options[] = { | |
550 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
551 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
552 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
553 | #ifdef TCP_NODELAY | |
554 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
555 | #endif | |
556 | #ifdef IPTOS_LOWDELAY | |
557 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
558 | #endif | |
559 | #ifdef IPTOS_THROUGHPUT | |
560 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
561 | #endif | |
562 | #ifdef SO_SNDBUF | |
563 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
564 | #endif | |
565 | #ifdef SO_RCVBUF | |
566 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
567 | #endif | |
568 | #ifdef SO_SNDLOWAT | |
569 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
570 | #endif | |
571 | #ifdef SO_RCVLOWAT | |
572 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
573 | #endif | |
574 | #ifdef SO_SNDTIMEO | |
575 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
576 | #endif | |
577 | #ifdef SO_RCVTIMEO | |
578 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
579 | #endif | |
580 | {NULL,0,0,0,0}}; | |
581 | ||
9c07d253 | 582 | |
f0fca04e | 583 | |
a7dc44d2 MP |
584 | /** |
585 | * Set user socket options | |
586 | **/ | |
f0fca04e AT |
587 | void set_socket_options(int fd, char *options) |
588 | { | |
589 | char *tok; | |
9c07d253 WD |
590 | |
591 | if (!options || !*options) | |
592 | return; | |
a6801c39 | 593 | |
f0fca04e | 594 | options = strdup(options); |
f0fca04e | 595 | |
9c07d253 WD |
596 | if (!options) |
597 | out_of_memory("set_socket_options"); | |
598 | ||
599 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
600 | int ret=0,i; |
601 | int value = 1; | |
602 | char *p; | |
603 | int got_value = 0; | |
604 | ||
605 | if ((p = strchr(tok,'='))) { | |
606 | *p = 0; | |
607 | value = atoi(p+1); | |
608 | got_value = 1; | |
609 | } | |
610 | ||
9c07d253 | 611 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
612 | if (strcmp(socket_options[i].name,tok)==0) |
613 | break; | |
9c07d253 | 614 | } |
f0fca04e AT |
615 | |
616 | if (!socket_options[i].name) { | |
617 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
618 | continue; | |
619 | } | |
620 | ||
621 | switch (socket_options[i].opttype) { | |
622 | case OPT_BOOL: | |
623 | case OPT_INT: | |
624 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
625 | socket_options[i].option, |
626 | (char *)&value, sizeof (int)); | |
f0fca04e | 627 | break; |
9c07d253 | 628 | |
f0fca04e AT |
629 | case OPT_ON: |
630 | if (got_value) | |
4ccfd96c | 631 | rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); |
f0fca04e AT |
632 | |
633 | { | |
634 | int on = socket_options[i].value; | |
635 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
636 | socket_options[i].option, |
637 | (char *)&on, sizeof (int)); | |
f0fca04e | 638 | } |
9c07d253 | 639 | break; |
f0fca04e | 640 | } |
9c07d253 | 641 | |
d62bcc17 WD |
642 | if (ret != 0) { |
643 | rsyserr(FERROR, errno, | |
644 | "failed to set socket option %s", tok); | |
645 | } | |
f0fca04e AT |
646 | } |
647 | ||
648 | free(options); | |
649 | } | |
650 | ||
a7dc44d2 MP |
651 | /** |
652 | * Become a daemon, discarding the controlling terminal | |
653 | **/ | |
f0fca04e AT |
654 | void become_daemon(void) |
655 | { | |
b11ed3b1 AT |
656 | int i; |
657 | ||
c46ded46 | 658 | if (fork()) { |
f0fca04e | 659 | _exit(0); |
c46ded46 | 660 | } |
f0fca04e AT |
661 | |
662 | /* detach from the terminal */ | |
4f5b0756 | 663 | #ifdef HAVE_SETSID |
f0fca04e | 664 | setsid(); |
4f5b0756 | 665 | #elif defined TIOCNOTTY |
c46ded46 AT |
666 | i = open("/dev/tty", O_RDWR); |
667 | if (i >= 0) { | |
9c07d253 | 668 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 669 | close(i); |
f0fca04e | 670 | } |
f0fca04e | 671 | #endif |
b11ed3b1 | 672 | /* make sure that stdin, stdout an stderr don't stuff things |
a3a84107 | 673 | * up (library functions, for example) */ |
9c07d253 WD |
674 | for (i = 0; i < 3; i++) { |
675 | close(i); | |
b11ed3b1 AT |
676 | open("/dev/null", O_RDWR); |
677 | } | |
bc2e93eb | 678 | } |
ff8b29b8 | 679 | |
eecd22ff | 680 | |
a7dc44d2 MP |
681 | /** |
682 | * This is like socketpair but uses tcp. It is used by the Samba | |
683 | * regression test code. | |
9c07d253 | 684 | * |
a7dc44d2 MP |
685 | * The function guarantees that nobody else can attach to the socket, |
686 | * or if they do that this function fails and the socket gets closed | |
687 | * returns 0 on success, -1 on failure the resulting file descriptors | |
688 | * are symmetrical. | |
689 | **/ | |
eecd22ff MP |
690 | static int socketpair_tcp(int fd[2]) |
691 | { | |
692 | int listener; | |
693 | struct sockaddr_in sock; | |
694 | struct sockaddr_in sock2; | |
a3a84107 | 695 | socklen_t socklen = sizeof sock; |
eb8ffa90 | 696 | int connect_done = 0; |
9c07d253 | 697 | |
eecd22ff MP |
698 | fd[0] = fd[1] = listener = -1; |
699 | ||
a3a84107 | 700 | memset(&sock, 0, sizeof sock); |
9c07d253 WD |
701 | |
702 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
703 | goto failed; | |
eecd22ff | 704 | |
a3a84107 | 705 | memset(&sock2, 0, sizeof sock2); |
4f5b0756 | 706 | #ifdef HAVE_SOCKADDR_IN_LEN |
a3a84107 | 707 | sock2.sin_len = sizeof sock2; |
eecd22ff | 708 | #endif |
a3a84107 | 709 | sock2.sin_family = PF_INET; |
eecd22ff | 710 | |
a3a84107 | 711 | bind(listener, (struct sockaddr *)&sock2, sizeof sock2); |
eecd22ff | 712 | |
9c07d253 WD |
713 | if (listen(listener, 1) != 0) |
714 | goto failed; | |
eecd22ff | 715 | |
9c07d253 WD |
716 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
717 | goto failed; | |
eecd22ff | 718 | |
9c07d253 WD |
719 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
720 | goto failed; | |
eecd22ff MP |
721 | |
722 | set_nonblocking(fd[1]); | |
723 | ||
724 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
725 | ||
a3a84107 | 726 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { |
9c07d253 WD |
727 | if (errno != EINPROGRESS) |
728 | goto failed; | |
729 | } else | |
eecd22ff | 730 | connect_done = 1; |
eecd22ff | 731 | |
9c07d253 WD |
732 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
733 | goto failed; | |
eecd22ff MP |
734 | |
735 | close(listener); | |
ab217f7f WD |
736 | listener = -1; |
737 | ||
738 | set_blocking(fd[1]); | |
739 | ||
eecd22ff | 740 | if (connect_done == 0) { |
a3a84107 | 741 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 |
9c07d253 WD |
742 | && errno != EISCONN) |
743 | goto failed; | |
eecd22ff MP |
744 | } |
745 | ||
eecd22ff MP |
746 | /* all OK! */ |
747 | return 0; | |
748 | ||
749 | failed: | |
9c07d253 WD |
750 | if (fd[0] != -1) |
751 | close(fd[0]); | |
752 | if (fd[1] != -1) | |
753 | close(fd[1]); | |
754 | if (listener != -1) | |
755 | close(listener); | |
eecd22ff MP |
756 | return -1; |
757 | } | |
758 | ||
759 | ||
d02984bb MP |
760 | |
761 | /** | |
762 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
763 | * stdin and stdout. This is used to fake a connection to a daemon |
764 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
765 | * |
766 | * @return a socket which is attached to a subprocess running | |
767 | * "prog". stdin and stdout are attached. stderr is left attached to | |
768 | * the original stderr | |
769 | **/ | |
eecd22ff MP |
770 | int sock_exec(const char *prog) |
771 | { | |
772 | int fd[2]; | |
9c07d253 | 773 | |
eecd22ff | 774 | if (socketpair_tcp(fd) != 0) { |
d62bcc17 | 775 | rsyserr(FERROR, errno, "socketpair_tcp failed"); |
eecd22ff MP |
776 | return -1; |
777 | } | |
df5cd107 WD |
778 | if (verbose >= 2) |
779 | rprintf(FINFO, "Running socket program: \"%s\"\n", prog); | |
eecd22ff MP |
780 | if (fork() == 0) { |
781 | close(fd[0]); | |
782 | close(0); | |
783 | close(1); | |
784 | dup(fd[1]); | |
785 | dup(fd[1]); | |
9c07d253 | 786 | exit(system(prog)); |
eecd22ff | 787 | } |
9c07d253 | 788 | close(fd[1]); |
eecd22ff MP |
789 | return fd[0]; |
790 | } |