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 | 34 | #include "rsync.h" |
5899b8cf WD |
35 | #include <netinet/in_systm.h> |
36 | #include <netinet/ip.h> | |
f0fca04e | 37 | |
2c7d63c7 WD |
38 | extern char *bind_address; |
39 | extern int default_af_hint; | |
9a5a8673 | 40 | |
44e604f4 | 41 | #ifdef HAVE_SIGACTION |
2b28968d WD |
42 | static struct sigaction sigact; |
43 | #endif | |
44 | ||
a7dc44d2 MP |
45 | /** |
46 | * Establish a proxy connection on an open socket to a web proxy by | |
a3a84107 WD |
47 | * using the CONNECT method. If proxy_user and proxy_pass are not NULL, |
48 | * they are used to authenticate to the proxy using the "Basic" | |
49 | * proxy-authorization protocol | |
a7dc44d2 | 50 | **/ |
a3a84107 WD |
51 | static int establish_proxy_connection(int fd, char *host, int port, |
52 | char *proxy_user, char *proxy_pass) | |
4c3b4b25 | 53 | { |
a3a84107 WD |
54 | char *cp, buffer[1024]; |
55 | char *authhdr, authbuf[1024]; | |
56 | int len; | |
57 | ||
58 | if (proxy_user && proxy_pass) { | |
893c4cc0 WD |
59 | stringjoin(buffer, sizeof buffer, |
60 | proxy_user, ":", proxy_pass, NULL); | |
a3a84107 | 61 | len = strlen(buffer); |
4c3b4b25 | 62 | |
8030b28f | 63 | if ((len*8 + 5) / 6 >= (int)sizeof authbuf - 3) { |
a3a84107 WD |
64 | rprintf(FERROR, |
65 | "authentication information is too long\n"); | |
66 | return -1; | |
67 | } | |
68 | ||
6854bf69 | 69 | base64_encode(buffer, len, authbuf, 1); |
a3a84107 WD |
70 | authhdr = "\r\nProxy-Authorization: Basic "; |
71 | } else { | |
72 | *authbuf = '\0'; | |
73 | authhdr = ""; | |
74 | } | |
75 | ||
76 | snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", | |
77 | host, port, authhdr, authbuf); | |
78 | len = strlen(buffer); | |
79 | if (write(fd, buffer, len) != len) { | |
d62bcc17 | 80 | rsyserr(FERROR, errno, "failed to write to proxy"); |
4c3b4b25 AT |
81 | return -1; |
82 | } | |
83 | ||
a3a84107 | 84 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 85 | if (read(fd, cp, 1) != 1) { |
d62bcc17 | 86 | rsyserr(FERROR, errno, "failed to read from proxy"); |
4c3b4b25 AT |
87 | return -1; |
88 | } | |
89 | if (*cp == '\n') | |
90 | break; | |
91 | } | |
92 | ||
93 | if (*cp != '\n') | |
94 | cp++; | |
95 | *cp-- = '\0'; | |
96 | if (*cp == '\r') | |
97 | *cp = '\0'; | |
98 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
4ccfd96c | 99 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
100 | buffer); |
101 | return -1; | |
102 | } | |
9c07d253 | 103 | for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {} |
4c3b4b25 AT |
104 | while (*cp == ' ') |
105 | cp++; | |
106 | if (*cp != '2') { | |
4ccfd96c | 107 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
108 | buffer); |
109 | return -1; | |
110 | } | |
111 | /* throw away the rest of the HTTP header */ | |
112 | while (1) { | |
a3a84107 | 113 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 114 | if (read(fd, cp, 1) != 1) { |
d62bcc17 WD |
115 | rsyserr(FERROR, errno, |
116 | "failed to read from proxy"); | |
4c3b4b25 AT |
117 | return -1; |
118 | } | |
119 | if (*cp == '\n') | |
120 | break; | |
121 | } | |
9c07d253 | 122 | if (cp > buffer && *cp == '\n') |
4c3b4b25 | 123 | cp--; |
9c07d253 | 124 | if (cp == buffer && (*cp == '\n' || *cp == '\r')) |
4c3b4b25 AT |
125 | break; |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
130 | ||
f8be7d42 MP |
131 | /** |
132 | * Try to set the local address for a newly-created socket. Return -1 | |
133 | * if this fails. | |
134 | **/ | |
e028b9ff | 135 | int try_bind_local(int s, int ai_family, int ai_socktype, |
4313d6f9 | 136 | const char *bind_addr) |
f8be7d42 MP |
137 | { |
138 | int error; | |
139 | struct addrinfo bhints, *bres_all, *r; | |
140 | ||
a3a84107 | 141 | memset(&bhints, 0, sizeof bhints); |
f8be7d42 MP |
142 | bhints.ai_family = ai_family; |
143 | bhints.ai_socktype = ai_socktype; | |
144 | bhints.ai_flags = AI_PASSIVE; | |
4313d6f9 | 145 | if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) { |
f8be7d42 | 146 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
4313d6f9 | 147 | bind_addr, gai_strerror(error)); |
f8be7d42 MP |
148 | return -1; |
149 | } | |
150 | ||
151 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 152 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 153 | continue; |
6b2d24de | 154 | freeaddrinfo(bres_all); |
f8be7d42 MP |
155 | return s; |
156 | } | |
157 | ||
158 | /* no error message; there might be some problem that allows | |
159 | * creation of the socket but not binding, perhaps if the | |
160 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 161 | freeaddrinfo(bres_all); |
f8be7d42 MP |
162 | return -1; |
163 | } | |
164 | ||
eecd22ff | 165 | |
d5d4b282 MP |
166 | /** |
167 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 168 | * |
d5d4b282 MP |
169 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
170 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 171 | * |
d5d4b282 MP |
172 | * Now that we support IPv6 we need to look up the remote machine's |
173 | * address first, using @p af_hint to set a preference for the type | |
174 | * of address. Then depending on whether it has v4 or v6 addresses we | |
175 | * try to open a connection. | |
06963d0f | 176 | * |
d5d4b282 MP |
177 | * The loop allows for machines with some addresses which may not be |
178 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
179 | * but we can get ip4 packets through. | |
180 | * | |
4313d6f9 | 181 | * @param bind_addr Local address to use. Normally NULL to bind |
d5d4b282 MP |
182 | * the wildcard address. |
183 | * | |
184 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 185 | **/ |
4313d6f9 | 186 | int open_socket_out(char *host, int port, const char *bind_addr, |
d5d4b282 | 187 | int af_hint) |
bc2e93eb | 188 | { |
f0fca04e | 189 | int type = SOCK_STREAM; |
a3a84107 | 190 | int error, s; |
06963d0f MP |
191 | struct addrinfo hints, *res0, *res; |
192 | char portbuf[10]; | |
a3a84107 | 193 | char *h, *cp; |
4c3b4b25 AT |
194 | int proxied = 0; |
195 | char buffer[1024]; | |
a3a84107 | 196 | char *proxy_user = NULL, *proxy_pass = NULL; |
4c3b4b25 | 197 | |
660c6fbd | 198 | /* if we have a RSYNC_PROXY env variable then redirect our |
a3a84107 | 199 | * connetcion via a web proxy at the given address. */ |
4c3b4b25 | 200 | h = getenv("RSYNC_PROXY"); |
9c07d253 | 201 | proxied = h != NULL && *h != '\0'; |
4c3b4b25 AT |
202 | |
203 | if (proxied) { | |
a3a84107 WD |
204 | strlcpy(buffer, h, sizeof buffer); |
205 | ||
206 | /* Is the USER:PASS@ prefix present? */ | |
b31c92ed | 207 | if ((cp = strrchr(buffer, '@')) != NULL) { |
a3a84107 WD |
208 | *cp++ = '\0'; |
209 | /* The remainder is the HOST:PORT part. */ | |
210 | h = cp; | |
211 | ||
212 | if ((cp = strchr(buffer, ':')) == NULL) { | |
213 | rprintf(FERROR, | |
214 | "invalid proxy specification: should be USER:PASS@HOST:PORT\n"); | |
215 | return -1; | |
216 | } | |
217 | *cp++ = '\0'; | |
218 | ||
219 | proxy_user = buffer; | |
220 | proxy_pass = cp; | |
221 | } else { | |
222 | /* The whole buffer is the HOST:PORT part. */ | |
223 | h = buffer; | |
224 | } | |
225 | ||
226 | if ((cp = strchr(h, ':')) == NULL) { | |
660c6fbd MP |
227 | rprintf(FERROR, |
228 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
229 | return -1; |
230 | } | |
231 | *cp++ = '\0'; | |
a3a84107 | 232 | strlcpy(portbuf, cp, sizeof portbuf); |
7bea78ce MP |
233 | if (verbose >= 2) { |
234 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
235 | h, portbuf); | |
236 | } | |
4c3b4b25 | 237 | } else { |
a3a84107 | 238 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4c3b4b25 | 239 | h = host; |
4c3b4b25 | 240 | } |
f0fca04e | 241 | |
a3a84107 | 242 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 243 | hints.ai_family = af_hint; |
06963d0f MP |
244 | hints.ai_socktype = type; |
245 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
246 | if (error) { | |
d5d4b282 MP |
247 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
248 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
249 | return -1; |
250 | } | |
251 | ||
06963d0f | 252 | s = -1; |
2d6dbe29 MP |
253 | /* Try to connect to all addresses for this machine until we get |
254 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
255 | * addresses. We need to create a socket for each record, since the | |
256 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
257 | for (res = res0; res; res = res->ai_next) { |
258 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
259 | if (s < 0) | |
260 | continue; | |
f0fca04e | 261 | |
4313d6f9 | 262 | if (bind_addr |
a3a84107 | 263 | && try_bind_local(s, res->ai_family, type, |
4313d6f9 | 264 | bind_addr) == -1) { |
a3a84107 WD |
265 | close(s); |
266 | s = -1; | |
267 | continue; | |
268 | } | |
06963d0f MP |
269 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
270 | close(s); | |
271 | s = -1; | |
272 | continue; | |
273 | } | |
a3a84107 WD |
274 | if (proxied |
275 | && establish_proxy_connection(s, host, port, | |
276 | proxy_user, proxy_pass) != 0) { | |
06963d0f MP |
277 | close(s); |
278 | s = -1; | |
279 | continue; | |
a3a84107 WD |
280 | } |
281 | break; | |
4c3b4b25 | 282 | } |
06963d0f MP |
283 | freeaddrinfo(res0); |
284 | if (s < 0) { | |
d62bcc17 | 285 | rsyserr(FERROR, errno, "failed to connect to %s", h); |
f0fca04e AT |
286 | return -1; |
287 | } | |
06963d0f | 288 | return s; |
f0fca04e AT |
289 | } |
290 | ||
291 | ||
eecd22ff MP |
292 | /** |
293 | * Open an outgoing socket, but allow for it to be intercepted by | |
294 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
295 | * socketpair rather than really opening a socket. | |
296 | * | |
297 | * We use this primarily in testing to detect TCP flow bugs, but not | |
298 | * cause security problems by really opening remote connections. | |
299 | * | |
300 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f | 301 | * |
4313d6f9 | 302 | * @param bind_addr Local address to use. Normally NULL to get the stack default. |
eecd22ff | 303 | **/ |
4313d6f9 | 304 | int open_socket_out_wrapped(char *host, int port, const char *bind_addr, |
9c07d253 | 305 | int af_hint) |
eecd22ff | 306 | { |
df5cd107 | 307 | char *prog = getenv("RSYNC_CONNECT_PROG"); |
eecd22ff | 308 | |
df5cd107 WD |
309 | if (verbose >= 2) { |
310 | rprintf(FINFO, "%sopening tcp connection to %s port %d\n", | |
311 | prog ? "Using RSYNC_CONNECT_PROG instead of " : "", | |
312 | host, port); | |
313 | } | |
314 | if (prog) | |
9c07d253 | 315 | return sock_exec(prog); |
4313d6f9 | 316 | return open_socket_out(host, port, bind_addr, af_hint); |
eecd22ff MP |
317 | } |
318 | ||
319 | ||
320 | ||
06963d0f | 321 | /** |
2c7d63c7 WD |
322 | * Open one or more sockets for incoming data using the specified type, |
323 | * port, and address. | |
06963d0f | 324 | * |
2c7d63c7 WD |
325 | * The getaddrinfo() call may return several address results, e.g. for |
326 | * the machine's IPv4 and IPv6 name. | |
9c07d253 | 327 | * |
2c7d63c7 WD |
328 | * We return an array of file-descriptors to the sockets, with a trailing |
329 | * -1 value to indicate the end of the list. | |
9c07d253 | 330 | * |
4313d6f9 | 331 | * @param bind_addr Local address to bind, or NULL to allow it to |
06963d0f MP |
332 | * default. |
333 | **/ | |
4313d6f9 | 334 | static int *open_socket_in(int type, int port, const char *bind_addr, |
b0fd253a | 335 | int af_hint) |
f0fca04e | 336 | { |
2c7d63c7 | 337 | int one = 1; |
5c6d4632 | 338 | int s, *socks, maxs, i, ecnt; |
13e29995 | 339 | struct addrinfo hints, *all_ai, *resp; |
5c6d4632 | 340 | char portbuf[10], **errmsgs; |
06963d0f MP |
341 | int error; |
342 | ||
a3a84107 | 343 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 344 | hints.ai_family = af_hint; |
06963d0f MP |
345 | hints.ai_socktype = type; |
346 | hints.ai_flags = AI_PASSIVE; | |
a3a84107 | 347 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4313d6f9 | 348 | error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); |
06963d0f | 349 | if (error) { |
7ef6aa64 | 350 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
4313d6f9 | 351 | bind_addr, gai_strerror(error)); |
b0fd253a WD |
352 | return NULL; |
353 | } | |
354 | ||
355 | /* Count max number of sockets we might open. */ | |
356 | for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} | |
2c7d63c7 | 357 | |
5c6d4632 WD |
358 | socks = new_array(int, maxs + 1); |
359 | errmsgs = new_array(char *, maxs); | |
360 | if (!socks || !errmsgs) | |
2c7d63c7 | 361 | out_of_memory("open_socket_in"); |
06963d0f | 362 | |
13e29995 MP |
363 | /* We may not be able to create the socket, if for example the |
364 | * machine knows about IPv6 in the C library, but not in the | |
365 | * kernel. */ | |
5c6d4632 | 366 | for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) { |
13e29995 MP |
367 | s = socket(resp->ai_family, resp->ai_socktype, |
368 | resp->ai_protocol); | |
369 | ||
b0fd253a | 370 | if (s == -1) { |
5c6d4632 WD |
371 | int r = asprintf(&errmsgs[ecnt++], |
372 | "socket(%d,%d,%d) failed: %s\n", | |
373 | (int)resp->ai_family, (int)resp->ai_socktype, | |
374 | (int)resp->ai_protocol, strerror(errno)); | |
375 | if (r < 0) | |
376 | out_of_memory("open_socket_in"); | |
13e29995 MP |
377 | /* See if there's another address that will work... */ |
378 | continue; | |
b0fd253a | 379 | } |
9c07d253 | 380 | |
13e29995 MP |
381 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
382 | (char *)&one, sizeof one); | |
9c07d253 | 383 | |
b0fd253a WD |
384 | #ifdef IPV6_V6ONLY |
385 | if (resp->ai_family == AF_INET6) { | |
dcd08dc5 WD |
386 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, |
387 | (char *)&one, sizeof one) < 0 | |
388 | && default_af_hint != AF_INET6) { | |
389 | close(s); | |
390 | continue; | |
391 | } | |
b0fd253a WD |
392 | } |
393 | #endif | |
394 | ||
e028b9ff WD |
395 | /* Now we've got a socket - we need to bind it. */ |
396 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 | 397 | /* Nope, try another */ |
5c6d4632 | 398 | int r = asprintf(&errmsgs[ecnt++], |
e2d774cd WD |
399 | "bind() failed: %s (address-family %d)\n", |
400 | strerror(errno), (int)resp->ai_family); | |
5c6d4632 WD |
401 | if (r < 0) |
402 | out_of_memory("open_socket_in"); | |
13e29995 MP |
403 | close(s); |
404 | continue; | |
b8771f96 | 405 | } |
e23d790f | 406 | |
2c7d63c7 | 407 | socks[i++] = s; |
f0fca04e | 408 | } |
2c7d63c7 | 409 | socks[i] = -1; |
f0fca04e | 410 | |
b0fd253a WD |
411 | if (all_ai) |
412 | freeaddrinfo(all_ai); | |
b8771f96 | 413 | |
5c6d4632 WD |
414 | /* Only output the socket()/bind() messages if we were totally |
415 | * unsuccessful, or if the daemon is being run with -vv. */ | |
416 | for (s = 0; s < ecnt; s++) { | |
417 | if (!i || verbose > 1) | |
418 | rwrite(FLOG, errmsgs[s], strlen(errmsgs[s])); | |
419 | free(errmsgs[s]); | |
420 | } | |
421 | free(errmsgs); | |
422 | ||
2c7d63c7 | 423 | if (!i) { |
b0fd253a | 424 | rprintf(FERROR, |
2c7d63c7 WD |
425 | "unable to bind any inbound sockets on port %d\n", |
426 | port); | |
b0fd253a WD |
427 | free(socks); |
428 | return NULL; | |
429 | } | |
430 | return socks; | |
f0fca04e AT |
431 | } |
432 | ||
433 | ||
7c1b4daa MP |
434 | /* |
435 | * Determine if a file descriptor is in fact a socket | |
436 | */ | |
f0fca04e AT |
437 | int is_a_socket(int fd) |
438 | { | |
ac2a1a44 | 439 | int v; |
a3a84107 WD |
440 | socklen_t l = sizeof (int); |
441 | ||
442 | /* Parameters to getsockopt, setsockopt etc are very | |
443 | * unstandardized across platforms, so don't be surprised if | |
444 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. | |
445 | * It seems they all eventually get the right idea. | |
446 | * | |
447 | * Debian says: ``The fifth argument of getsockopt and | |
448 | * setsockopt is in reality an int [*] (and this is what BSD | |
449 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
450 | * resulted in the present socklen_t. The draft standard has | |
451 | * not been adopted yet, but glibc2 already follows it and | |
452 | * also has socklen_t [*]. See also accept(2).'' | |
453 | * | |
454 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 455 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
456 | } |
457 | ||
458 | ||
067669da WD |
459 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
460 | { | |
ca20c7fd WD |
461 | #ifdef WNOHANG |
462 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
463 | #endif | |
44e604f4 | 464 | #ifndef HAVE_SIGACTION |
cb984e62 | 465 | signal(SIGCHLD, sigchld_handler); |
2b28968d | 466 | #endif |
ca20c7fd WD |
467 | } |
468 | ||
469 | ||
39993af5 | 470 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e | 471 | { |
b0fd253a | 472 | fd_set deffds; |
d8d36af4 | 473 | int *sp, maxfd, i; |
f0fca04e | 474 | |
44e604f4 | 475 | #ifdef HAVE_SIGACTION |
2b28968d WD |
476 | sigact.sa_flags = SA_NOCLDSTOP; |
477 | #endif | |
478 | ||
f0fca04e | 479 | /* open an incoming socket */ |
b0fd253a WD |
480 | sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
481 | if (sp == NULL) | |
65417579 | 482 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
483 | |
484 | /* ready to listen */ | |
b0fd253a | 485 | FD_ZERO(&deffds); |
2c7d63c7 WD |
486 | for (i = 0, maxfd = -1; sp[i] >= 0; i++) { |
487 | if (listen(sp[i], 5) < 0) { | |
d62bcc17 | 488 | rsyserr(FERROR, errno, "listen() on socket failed"); |
4f5b0756 | 489 | #ifdef INET6 |
2c7d63c7 WD |
490 | if (errno == EADDRINUSE && i > 0) { |
491 | rprintf(FINFO, | |
880570f2 | 492 | "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); |
2c7d63c7 WD |
493 | } |
494 | #endif | |
b0fd253a WD |
495 | exit_cleanup(RERR_SOCKETIO); |
496 | } | |
497 | FD_SET(sp[i], &deffds); | |
498 | if (maxfd < sp[i]) | |
499 | maxfd = sp[i]; | |
f0fca04e AT |
500 | } |
501 | ||
f0fca04e | 502 | /* now accept incoming connections - forking a new process |
a3a84107 | 503 | * for each incoming connection */ |
f0fca04e AT |
504 | while (1) { |
505 | fd_set fds; | |
c4a5c57d | 506 | pid_t pid; |
f0fca04e | 507 | int fd; |
2d6dbe29 | 508 | struct sockaddr_storage addr; |
d54765c4 | 509 | socklen_t addrlen = sizeof addr; |
f0fca04e | 510 | |
15b84e14 | 511 | /* close log file before the potentially very long select so |
a3a84107 WD |
512 | * file can be trimmed by another process instead of growing |
513 | * forever */ | |
8ee6adef | 514 | logfile_close(); |
45a83540 | 515 | |
b0fd253a WD |
516 | #ifdef FD_COPY |
517 | FD_COPY(&deffds, &fds); | |
518 | #else | |
519 | fds = deffds; | |
520 | #endif | |
f0fca04e | 521 | |
b0fd253a | 522 | if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) |
9c07d253 | 523 | continue; |
f0fca04e | 524 | |
2c7d63c7 | 525 | for (i = 0, fd = -1; sp[i] >= 0; i++) { |
b0fd253a WD |
526 | if (FD_ISSET(sp[i], &fds)) { |
527 | fd = accept(sp[i], (struct sockaddr *)&addr, | |
528 | &addrlen); | |
529 | break; | |
530 | } | |
531 | } | |
f0fca04e | 532 | |
b0fd253a | 533 | if (fd < 0) |
9c07d253 | 534 | continue; |
f0fca04e | 535 | |
2b28968d | 536 | SIGACTION(SIGCHLD, sigchld_handler); |
31f440e6 | 537 | |
c4a5c57d | 538 | if ((pid = fork()) == 0) { |
9f639210 | 539 | int ret; |
2c7d63c7 WD |
540 | for (i = 0; sp[i] >= 0; i++) |
541 | close(sp[i]); | |
1da05366 | 542 | /* Re-open log file in child before possibly giving |
8ee6adef WD |
543 | * up privileges (see logfile_close() above). */ |
544 | logfile_reopen(); | |
9f639210 DD |
545 | ret = fn(fd, fd); |
546 | close_all(); | |
547 | _exit(ret); | |
c4a5c57d | 548 | } else if (pid < 0) { |
d62bcc17 WD |
549 | rsyserr(FERROR, errno, |
550 | "could not create child server process"); | |
c4a5c57d MP |
551 | close(fd); |
552 | /* This might have happened because we're | |
553 | * overloaded. Sleep briefly before trying to | |
554 | * accept again. */ | |
555 | sleep(2); | |
bd37c666 | 556 | } else { |
79845f28 | 557 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 558 | close(fd); |
f0fca04e | 559 | } |
f0fca04e | 560 | } |
f0fca04e AT |
561 | } |
562 | ||
563 | ||
564 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
565 | ||
566 | struct | |
567 | { | |
568 | char *name; | |
569 | int level; | |
570 | int option; | |
571 | int value; | |
572 | int opttype; | |
573 | } socket_options[] = { | |
574 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
575 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
576 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
577 | #ifdef TCP_NODELAY | |
578 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
579 | #endif | |
580 | #ifdef IPTOS_LOWDELAY | |
581 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
582 | #endif | |
583 | #ifdef IPTOS_THROUGHPUT | |
584 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
585 | #endif | |
586 | #ifdef SO_SNDBUF | |
587 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
588 | #endif | |
589 | #ifdef SO_RCVBUF | |
590 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
591 | #endif | |
592 | #ifdef SO_SNDLOWAT | |
593 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
594 | #endif | |
595 | #ifdef SO_RCVLOWAT | |
596 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
597 | #endif | |
598 | #ifdef SO_SNDTIMEO | |
599 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
600 | #endif | |
601 | #ifdef SO_RCVTIMEO | |
602 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
603 | #endif | |
604 | {NULL,0,0,0,0}}; | |
605 | ||
9c07d253 | 606 | |
f0fca04e | 607 | |
a7dc44d2 MP |
608 | /** |
609 | * Set user socket options | |
610 | **/ | |
f0fca04e AT |
611 | void set_socket_options(int fd, char *options) |
612 | { | |
613 | char *tok; | |
9c07d253 WD |
614 | |
615 | if (!options || !*options) | |
616 | return; | |
a6801c39 | 617 | |
f0fca04e | 618 | options = strdup(options); |
f0fca04e | 619 | |
9c07d253 WD |
620 | if (!options) |
621 | out_of_memory("set_socket_options"); | |
622 | ||
623 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
624 | int ret=0,i; |
625 | int value = 1; | |
626 | char *p; | |
627 | int got_value = 0; | |
628 | ||
629 | if ((p = strchr(tok,'='))) { | |
630 | *p = 0; | |
631 | value = atoi(p+1); | |
632 | got_value = 1; | |
633 | } | |
634 | ||
9c07d253 | 635 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
636 | if (strcmp(socket_options[i].name,tok)==0) |
637 | break; | |
9c07d253 | 638 | } |
f0fca04e AT |
639 | |
640 | if (!socket_options[i].name) { | |
641 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
642 | continue; | |
643 | } | |
644 | ||
645 | switch (socket_options[i].opttype) { | |
646 | case OPT_BOOL: | |
647 | case OPT_INT: | |
648 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
649 | socket_options[i].option, |
650 | (char *)&value, sizeof (int)); | |
f0fca04e | 651 | break; |
9c07d253 | 652 | |
f0fca04e AT |
653 | case OPT_ON: |
654 | if (got_value) | |
4ccfd96c | 655 | rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); |
f0fca04e AT |
656 | |
657 | { | |
658 | int on = socket_options[i].value; | |
659 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
660 | socket_options[i].option, |
661 | (char *)&on, sizeof (int)); | |
f0fca04e | 662 | } |
9c07d253 | 663 | break; |
f0fca04e | 664 | } |
9c07d253 | 665 | |
d62bcc17 WD |
666 | if (ret != 0) { |
667 | rsyserr(FERROR, errno, | |
668 | "failed to set socket option %s", tok); | |
669 | } | |
f0fca04e AT |
670 | } |
671 | ||
672 | free(options); | |
673 | } | |
674 | ||
a7dc44d2 MP |
675 | /** |
676 | * Become a daemon, discarding the controlling terminal | |
677 | **/ | |
f0fca04e AT |
678 | void become_daemon(void) |
679 | { | |
b11ed3b1 AT |
680 | int i; |
681 | ||
c46ded46 | 682 | if (fork()) { |
f0fca04e | 683 | _exit(0); |
c46ded46 | 684 | } |
f0fca04e AT |
685 | |
686 | /* detach from the terminal */ | |
4f5b0756 | 687 | #ifdef HAVE_SETSID |
f0fca04e | 688 | setsid(); |
4f5b0756 | 689 | #elif defined TIOCNOTTY |
c46ded46 AT |
690 | i = open("/dev/tty", O_RDWR); |
691 | if (i >= 0) { | |
9c07d253 | 692 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 693 | close(i); |
f0fca04e | 694 | } |
f0fca04e | 695 | #endif |
b11ed3b1 | 696 | /* make sure that stdin, stdout an stderr don't stuff things |
a3a84107 | 697 | * up (library functions, for example) */ |
9c07d253 WD |
698 | for (i = 0; i < 3; i++) { |
699 | close(i); | |
b11ed3b1 AT |
700 | open("/dev/null", O_RDWR); |
701 | } | |
bc2e93eb | 702 | } |
ff8b29b8 | 703 | |
eecd22ff | 704 | |
a7dc44d2 MP |
705 | /** |
706 | * This is like socketpair but uses tcp. It is used by the Samba | |
707 | * regression test code. | |
9c07d253 | 708 | * |
a7dc44d2 MP |
709 | * The function guarantees that nobody else can attach to the socket, |
710 | * or if they do that this function fails and the socket gets closed | |
711 | * returns 0 on success, -1 on failure the resulting file descriptors | |
712 | * are symmetrical. | |
713 | **/ | |
eecd22ff MP |
714 | static int socketpair_tcp(int fd[2]) |
715 | { | |
716 | int listener; | |
717 | struct sockaddr_in sock; | |
718 | struct sockaddr_in sock2; | |
a3a84107 | 719 | socklen_t socklen = sizeof sock; |
eb8ffa90 | 720 | int connect_done = 0; |
9c07d253 | 721 | |
eecd22ff MP |
722 | fd[0] = fd[1] = listener = -1; |
723 | ||
a3a84107 | 724 | memset(&sock, 0, sizeof sock); |
9c07d253 WD |
725 | |
726 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
727 | goto failed; | |
eecd22ff | 728 | |
a3a84107 | 729 | memset(&sock2, 0, sizeof sock2); |
4f5b0756 | 730 | #ifdef HAVE_SOCKADDR_IN_LEN |
a3a84107 | 731 | sock2.sin_len = sizeof sock2; |
eecd22ff | 732 | #endif |
a3a84107 | 733 | sock2.sin_family = PF_INET; |
eecd22ff | 734 | |
a3a84107 | 735 | bind(listener, (struct sockaddr *)&sock2, sizeof sock2); |
eecd22ff | 736 | |
9c07d253 WD |
737 | if (listen(listener, 1) != 0) |
738 | goto failed; | |
eecd22ff | 739 | |
9c07d253 WD |
740 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
741 | goto failed; | |
eecd22ff | 742 | |
9c07d253 WD |
743 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
744 | goto failed; | |
eecd22ff MP |
745 | |
746 | set_nonblocking(fd[1]); | |
747 | ||
748 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
749 | ||
a3a84107 | 750 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { |
9c07d253 WD |
751 | if (errno != EINPROGRESS) |
752 | goto failed; | |
753 | } else | |
eecd22ff | 754 | connect_done = 1; |
eecd22ff | 755 | |
9c07d253 WD |
756 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
757 | goto failed; | |
eecd22ff MP |
758 | |
759 | close(listener); | |
ab217f7f WD |
760 | listener = -1; |
761 | ||
762 | set_blocking(fd[1]); | |
763 | ||
eecd22ff | 764 | if (connect_done == 0) { |
a3a84107 | 765 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 |
9c07d253 WD |
766 | && errno != EISCONN) |
767 | goto failed; | |
eecd22ff MP |
768 | } |
769 | ||
eecd22ff MP |
770 | /* all OK! */ |
771 | return 0; | |
772 | ||
773 | failed: | |
9c07d253 WD |
774 | if (fd[0] != -1) |
775 | close(fd[0]); | |
776 | if (fd[1] != -1) | |
777 | close(fd[1]); | |
778 | if (listener != -1) | |
779 | close(listener); | |
eecd22ff MP |
780 | return -1; |
781 | } | |
782 | ||
783 | ||
d02984bb MP |
784 | |
785 | /** | |
786 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
787 | * stdin and stdout. This is used to fake a connection to a daemon |
788 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
789 | * |
790 | * @return a socket which is attached to a subprocess running | |
791 | * "prog". stdin and stdout are attached. stderr is left attached to | |
792 | * the original stderr | |
793 | **/ | |
eecd22ff MP |
794 | int sock_exec(const char *prog) |
795 | { | |
796 | int fd[2]; | |
9c07d253 | 797 | |
eecd22ff | 798 | if (socketpair_tcp(fd) != 0) { |
d62bcc17 | 799 | rsyserr(FERROR, errno, "socketpair_tcp failed"); |
eecd22ff MP |
800 | return -1; |
801 | } | |
df5cd107 WD |
802 | if (verbose >= 2) |
803 | rprintf(FINFO, "Running socket program: \"%s\"\n", prog); | |
eecd22ff MP |
804 | if (fork() == 0) { |
805 | close(fd[0]); | |
806 | close(0); | |
807 | close(1); | |
808 | dup(fd[1]); | |
809 | dup(fd[1]); | |
9c07d253 | 810 | exit(system(prog)); |
eecd22ff | 811 | } |
9c07d253 | 812 | close(fd[1]); |
eecd22ff MP |
813 | return fd[0]; |
814 | } |