Commit | Line | Data |
---|---|---|
0f78b815 | 1 | /* |
d5d4b282 | 2 | * Socket functions used in rsync. |
362099a5 | 3 | * |
0f78b815 WD |
4 | * Copyright (C) 1992-2001 Andrew Tridgell <tridge@samba.org> |
5 | * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org> | |
6 | * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison | |
7 | * | |
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. | |
12 | * | |
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. | |
17 | * | |
e7c67065 WD |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 WD |
21 | */ |
22 | ||
23 | /* This file is now converted to use the new-style getaddrinfo() | |
362099a5 MP |
24 | * interface, which supports IPv6 but is also supported on recent |
25 | * IPv4-only machines. On systems that don't have that interface, we | |
0f78b815 | 26 | * emulate it using the KAME implementation. */ |
bc2e93eb | 27 | |
f0fca04e | 28 | #include "rsync.h" |
5899b8cf WD |
29 | #include <netinet/in_systm.h> |
30 | #include <netinet/ip.h> | |
0f5c1c19 | 31 | #include <netinet/tcp.h> |
f0fca04e | 32 | |
2c7d63c7 WD |
33 | extern char *bind_address; |
34 | extern int default_af_hint; | |
9a5a8673 | 35 | |
44e604f4 | 36 | #ifdef HAVE_SIGACTION |
2b28968d WD |
37 | static struct sigaction sigact; |
38 | #endif | |
39 | ||
a7dc44d2 MP |
40 | /** |
41 | * Establish a proxy connection on an open socket to a web proxy by | |
a3a84107 WD |
42 | * using the CONNECT method. If proxy_user and proxy_pass are not NULL, |
43 | * they are used to authenticate to the proxy using the "Basic" | |
44 | * proxy-authorization protocol | |
a7dc44d2 | 45 | **/ |
a3a84107 WD |
46 | static int establish_proxy_connection(int fd, char *host, int port, |
47 | char *proxy_user, char *proxy_pass) | |
4c3b4b25 | 48 | { |
a3a84107 WD |
49 | char *cp, buffer[1024]; |
50 | char *authhdr, authbuf[1024]; | |
51 | int len; | |
52 | ||
53 | if (proxy_user && proxy_pass) { | |
893c4cc0 WD |
54 | stringjoin(buffer, sizeof buffer, |
55 | proxy_user, ":", proxy_pass, NULL); | |
a3a84107 | 56 | len = strlen(buffer); |
4c3b4b25 | 57 | |
8030b28f | 58 | if ((len*8 + 5) / 6 >= (int)sizeof authbuf - 3) { |
a3a84107 WD |
59 | rprintf(FERROR, |
60 | "authentication information is too long\n"); | |
61 | return -1; | |
62 | } | |
63 | ||
6854bf69 | 64 | base64_encode(buffer, len, authbuf, 1); |
a3a84107 WD |
65 | authhdr = "\r\nProxy-Authorization: Basic "; |
66 | } else { | |
67 | *authbuf = '\0'; | |
68 | authhdr = ""; | |
69 | } | |
70 | ||
71 | snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", | |
72 | host, port, authhdr, authbuf); | |
73 | len = strlen(buffer); | |
74 | if (write(fd, buffer, len) != len) { | |
d62bcc17 | 75 | rsyserr(FERROR, errno, "failed to write to proxy"); |
4c3b4b25 AT |
76 | return -1; |
77 | } | |
78 | ||
a3a84107 | 79 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 80 | if (read(fd, cp, 1) != 1) { |
d62bcc17 | 81 | rsyserr(FERROR, errno, "failed to read from proxy"); |
4c3b4b25 AT |
82 | return -1; |
83 | } | |
84 | if (*cp == '\n') | |
85 | break; | |
86 | } | |
87 | ||
88 | if (*cp != '\n') | |
89 | cp++; | |
90 | *cp-- = '\0'; | |
91 | if (*cp == '\r') | |
92 | *cp = '\0'; | |
93 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
4ccfd96c | 94 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
95 | buffer); |
96 | return -1; | |
97 | } | |
9c07d253 | 98 | for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {} |
4c3b4b25 AT |
99 | while (*cp == ' ') |
100 | cp++; | |
101 | if (*cp != '2') { | |
4ccfd96c | 102 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
103 | buffer); |
104 | return -1; | |
105 | } | |
106 | /* throw away the rest of the HTTP header */ | |
107 | while (1) { | |
a3a84107 | 108 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 109 | if (read(fd, cp, 1) != 1) { |
d62bcc17 WD |
110 | rsyserr(FERROR, errno, |
111 | "failed to read from proxy"); | |
4c3b4b25 AT |
112 | return -1; |
113 | } | |
114 | if (*cp == '\n') | |
115 | break; | |
116 | } | |
9c07d253 | 117 | if (cp > buffer && *cp == '\n') |
4c3b4b25 | 118 | cp--; |
9c07d253 | 119 | if (cp == buffer && (*cp == '\n' || *cp == '\r')) |
4c3b4b25 AT |
120 | break; |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
125 | ||
f8be7d42 MP |
126 | /** |
127 | * Try to set the local address for a newly-created socket. Return -1 | |
128 | * if this fails. | |
129 | **/ | |
e028b9ff | 130 | int try_bind_local(int s, int ai_family, int ai_socktype, |
4313d6f9 | 131 | const char *bind_addr) |
f8be7d42 MP |
132 | { |
133 | int error; | |
134 | struct addrinfo bhints, *bres_all, *r; | |
135 | ||
a3a84107 | 136 | memset(&bhints, 0, sizeof bhints); |
f8be7d42 MP |
137 | bhints.ai_family = ai_family; |
138 | bhints.ai_socktype = ai_socktype; | |
139 | bhints.ai_flags = AI_PASSIVE; | |
4313d6f9 | 140 | if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) { |
f8be7d42 | 141 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
4313d6f9 | 142 | bind_addr, gai_strerror(error)); |
f8be7d42 MP |
143 | return -1; |
144 | } | |
145 | ||
146 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 147 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 148 | continue; |
6b2d24de | 149 | freeaddrinfo(bres_all); |
f8be7d42 MP |
150 | return s; |
151 | } | |
152 | ||
153 | /* no error message; there might be some problem that allows | |
154 | * creation of the socket but not binding, perhaps if the | |
155 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 156 | freeaddrinfo(bres_all); |
f8be7d42 MP |
157 | return -1; |
158 | } | |
159 | ||
eecd22ff | 160 | |
d5d4b282 MP |
161 | /** |
162 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 163 | * |
d5d4b282 MP |
164 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
165 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 166 | * |
d5d4b282 MP |
167 | * Now that we support IPv6 we need to look up the remote machine's |
168 | * address first, using @p af_hint to set a preference for the type | |
169 | * of address. Then depending on whether it has v4 or v6 addresses we | |
170 | * try to open a connection. | |
06963d0f | 171 | * |
d5d4b282 MP |
172 | * The loop allows for machines with some addresses which may not be |
173 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
174 | * but we can get ip4 packets through. | |
175 | * | |
4313d6f9 | 176 | * @param bind_addr Local address to use. Normally NULL to bind |
d5d4b282 MP |
177 | * the wildcard address. |
178 | * | |
179 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 180 | **/ |
4313d6f9 | 181 | int open_socket_out(char *host, int port, const char *bind_addr, |
d5d4b282 | 182 | int af_hint) |
bc2e93eb | 183 | { |
f0fca04e | 184 | int type = SOCK_STREAM; |
a3a84107 | 185 | int error, s; |
06963d0f MP |
186 | struct addrinfo hints, *res0, *res; |
187 | char portbuf[10]; | |
a3a84107 | 188 | char *h, *cp; |
4c3b4b25 AT |
189 | int proxied = 0; |
190 | char buffer[1024]; | |
a3a84107 | 191 | char *proxy_user = NULL, *proxy_pass = NULL; |
4c3b4b25 | 192 | |
660c6fbd | 193 | /* if we have a RSYNC_PROXY env variable then redirect our |
a3a84107 | 194 | * connetcion via a web proxy at the given address. */ |
4c3b4b25 | 195 | h = getenv("RSYNC_PROXY"); |
9c07d253 | 196 | proxied = h != NULL && *h != '\0'; |
4c3b4b25 AT |
197 | |
198 | if (proxied) { | |
a3a84107 WD |
199 | strlcpy(buffer, h, sizeof buffer); |
200 | ||
201 | /* Is the USER:PASS@ prefix present? */ | |
b31c92ed | 202 | if ((cp = strrchr(buffer, '@')) != NULL) { |
a3a84107 WD |
203 | *cp++ = '\0'; |
204 | /* The remainder is the HOST:PORT part. */ | |
205 | h = cp; | |
206 | ||
207 | if ((cp = strchr(buffer, ':')) == NULL) { | |
208 | rprintf(FERROR, | |
209 | "invalid proxy specification: should be USER:PASS@HOST:PORT\n"); | |
210 | return -1; | |
211 | } | |
212 | *cp++ = '\0'; | |
213 | ||
214 | proxy_user = buffer; | |
215 | proxy_pass = cp; | |
216 | } else { | |
217 | /* The whole buffer is the HOST:PORT part. */ | |
218 | h = buffer; | |
219 | } | |
220 | ||
221 | if ((cp = strchr(h, ':')) == NULL) { | |
660c6fbd MP |
222 | rprintf(FERROR, |
223 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
224 | return -1; |
225 | } | |
226 | *cp++ = '\0'; | |
a3a84107 | 227 | strlcpy(portbuf, cp, sizeof portbuf); |
7bea78ce MP |
228 | if (verbose >= 2) { |
229 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
230 | h, portbuf); | |
231 | } | |
4c3b4b25 | 232 | } else { |
a3a84107 | 233 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4c3b4b25 | 234 | h = host; |
4c3b4b25 | 235 | } |
f0fca04e | 236 | |
a3a84107 | 237 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 238 | hints.ai_family = af_hint; |
06963d0f MP |
239 | hints.ai_socktype = type; |
240 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
241 | if (error) { | |
d5d4b282 MP |
242 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
243 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
244 | return -1; |
245 | } | |
246 | ||
06963d0f | 247 | s = -1; |
2d6dbe29 MP |
248 | /* Try to connect to all addresses for this machine until we get |
249 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
250 | * addresses. We need to create a socket for each record, since the | |
251 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
252 | for (res = res0; res; res = res->ai_next) { |
253 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
254 | if (s < 0) | |
255 | continue; | |
f0fca04e | 256 | |
4313d6f9 | 257 | if (bind_addr |
a3a84107 | 258 | && try_bind_local(s, res->ai_family, type, |
4313d6f9 | 259 | bind_addr) == -1) { |
a3a84107 WD |
260 | close(s); |
261 | s = -1; | |
262 | continue; | |
263 | } | |
06963d0f MP |
264 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
265 | close(s); | |
266 | s = -1; | |
267 | continue; | |
268 | } | |
a3a84107 WD |
269 | if (proxied |
270 | && establish_proxy_connection(s, host, port, | |
271 | proxy_user, proxy_pass) != 0) { | |
06963d0f MP |
272 | close(s); |
273 | s = -1; | |
274 | continue; | |
a3a84107 WD |
275 | } |
276 | break; | |
4c3b4b25 | 277 | } |
06963d0f MP |
278 | freeaddrinfo(res0); |
279 | if (s < 0) { | |
d62bcc17 | 280 | rsyserr(FERROR, errno, "failed to connect to %s", h); |
f0fca04e AT |
281 | return -1; |
282 | } | |
06963d0f | 283 | return s; |
f0fca04e AT |
284 | } |
285 | ||
286 | ||
eecd22ff MP |
287 | /** |
288 | * Open an outgoing socket, but allow for it to be intercepted by | |
289 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
290 | * socketpair rather than really opening a socket. | |
291 | * | |
292 | * We use this primarily in testing to detect TCP flow bugs, but not | |
293 | * cause security problems by really opening remote connections. | |
294 | * | |
295 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f | 296 | * |
4313d6f9 | 297 | * @param bind_addr Local address to use. Normally NULL to get the stack default. |
eecd22ff | 298 | **/ |
4313d6f9 | 299 | int open_socket_out_wrapped(char *host, int port, const char *bind_addr, |
9c07d253 | 300 | int af_hint) |
eecd22ff | 301 | { |
df5cd107 | 302 | char *prog = getenv("RSYNC_CONNECT_PROG"); |
eecd22ff | 303 | |
df5cd107 WD |
304 | if (verbose >= 2) { |
305 | rprintf(FINFO, "%sopening tcp connection to %s port %d\n", | |
306 | prog ? "Using RSYNC_CONNECT_PROG instead of " : "", | |
307 | host, port); | |
308 | } | |
309 | if (prog) | |
9c07d253 | 310 | return sock_exec(prog); |
4313d6f9 | 311 | return open_socket_out(host, port, bind_addr, af_hint); |
eecd22ff MP |
312 | } |
313 | ||
314 | ||
315 | ||
06963d0f | 316 | /** |
2c7d63c7 WD |
317 | * Open one or more sockets for incoming data using the specified type, |
318 | * port, and address. | |
06963d0f | 319 | * |
2c7d63c7 WD |
320 | * The getaddrinfo() call may return several address results, e.g. for |
321 | * the machine's IPv4 and IPv6 name. | |
9c07d253 | 322 | * |
2c7d63c7 WD |
323 | * We return an array of file-descriptors to the sockets, with a trailing |
324 | * -1 value to indicate the end of the list. | |
9c07d253 | 325 | * |
4313d6f9 | 326 | * @param bind_addr Local address to bind, or NULL to allow it to |
06963d0f MP |
327 | * default. |
328 | **/ | |
4313d6f9 | 329 | static int *open_socket_in(int type, int port, const char *bind_addr, |
b0fd253a | 330 | int af_hint) |
f0fca04e | 331 | { |
2c7d63c7 | 332 | int one = 1; |
5c6d4632 | 333 | int s, *socks, maxs, i, ecnt; |
13e29995 | 334 | struct addrinfo hints, *all_ai, *resp; |
5c6d4632 | 335 | char portbuf[10], **errmsgs; |
06963d0f MP |
336 | int error; |
337 | ||
a3a84107 | 338 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 339 | hints.ai_family = af_hint; |
06963d0f MP |
340 | hints.ai_socktype = type; |
341 | hints.ai_flags = AI_PASSIVE; | |
a3a84107 | 342 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4313d6f9 | 343 | error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); |
06963d0f | 344 | if (error) { |
7ef6aa64 | 345 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
4313d6f9 | 346 | bind_addr, gai_strerror(error)); |
b0fd253a WD |
347 | return NULL; |
348 | } | |
349 | ||
350 | /* Count max number of sockets we might open. */ | |
351 | for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} | |
2c7d63c7 | 352 | |
5c6d4632 WD |
353 | socks = new_array(int, maxs + 1); |
354 | errmsgs = new_array(char *, maxs); | |
355 | if (!socks || !errmsgs) | |
2c7d63c7 | 356 | out_of_memory("open_socket_in"); |
06963d0f | 357 | |
13e29995 MP |
358 | /* We may not be able to create the socket, if for example the |
359 | * machine knows about IPv6 in the C library, but not in the | |
360 | * kernel. */ | |
5c6d4632 | 361 | for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) { |
13e29995 MP |
362 | s = socket(resp->ai_family, resp->ai_socktype, |
363 | resp->ai_protocol); | |
364 | ||
b0fd253a | 365 | if (s == -1) { |
5c6d4632 WD |
366 | int r = asprintf(&errmsgs[ecnt++], |
367 | "socket(%d,%d,%d) failed: %s\n", | |
368 | (int)resp->ai_family, (int)resp->ai_socktype, | |
369 | (int)resp->ai_protocol, strerror(errno)); | |
370 | if (r < 0) | |
371 | out_of_memory("open_socket_in"); | |
13e29995 MP |
372 | /* See if there's another address that will work... */ |
373 | continue; | |
b0fd253a | 374 | } |
9c07d253 | 375 | |
13e29995 MP |
376 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
377 | (char *)&one, sizeof one); | |
9c07d253 | 378 | |
b0fd253a WD |
379 | #ifdef IPV6_V6ONLY |
380 | if (resp->ai_family == AF_INET6) { | |
dcd08dc5 WD |
381 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, |
382 | (char *)&one, sizeof one) < 0 | |
383 | && default_af_hint != AF_INET6) { | |
384 | close(s); | |
385 | continue; | |
386 | } | |
b0fd253a WD |
387 | } |
388 | #endif | |
389 | ||
e028b9ff WD |
390 | /* Now we've got a socket - we need to bind it. */ |
391 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 | 392 | /* Nope, try another */ |
5c6d4632 | 393 | int r = asprintf(&errmsgs[ecnt++], |
e2d774cd WD |
394 | "bind() failed: %s (address-family %d)\n", |
395 | strerror(errno), (int)resp->ai_family); | |
5c6d4632 WD |
396 | if (r < 0) |
397 | out_of_memory("open_socket_in"); | |
13e29995 MP |
398 | close(s); |
399 | continue; | |
b8771f96 | 400 | } |
e23d790f | 401 | |
2c7d63c7 | 402 | socks[i++] = s; |
f0fca04e | 403 | } |
2c7d63c7 | 404 | socks[i] = -1; |
f0fca04e | 405 | |
b0fd253a WD |
406 | if (all_ai) |
407 | freeaddrinfo(all_ai); | |
b8771f96 | 408 | |
5c6d4632 WD |
409 | /* Only output the socket()/bind() messages if we were totally |
410 | * unsuccessful, or if the daemon is being run with -vv. */ | |
411 | for (s = 0; s < ecnt; s++) { | |
412 | if (!i || verbose > 1) | |
413 | rwrite(FLOG, errmsgs[s], strlen(errmsgs[s])); | |
414 | free(errmsgs[s]); | |
415 | } | |
416 | free(errmsgs); | |
417 | ||
2c7d63c7 | 418 | if (!i) { |
b0fd253a | 419 | rprintf(FERROR, |
2c7d63c7 WD |
420 | "unable to bind any inbound sockets on port %d\n", |
421 | port); | |
b0fd253a WD |
422 | free(socks); |
423 | return NULL; | |
424 | } | |
425 | return socks; | |
f0fca04e AT |
426 | } |
427 | ||
428 | ||
7c1b4daa MP |
429 | /* |
430 | * Determine if a file descriptor is in fact a socket | |
431 | */ | |
f0fca04e AT |
432 | int is_a_socket(int fd) |
433 | { | |
ac2a1a44 | 434 | int v; |
a3a84107 WD |
435 | socklen_t l = sizeof (int); |
436 | ||
437 | /* Parameters to getsockopt, setsockopt etc are very | |
438 | * unstandardized across platforms, so don't be surprised if | |
439 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. | |
440 | * It seems they all eventually get the right idea. | |
441 | * | |
442 | * Debian says: ``The fifth argument of getsockopt and | |
443 | * setsockopt is in reality an int [*] (and this is what BSD | |
444 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
445 | * resulted in the present socklen_t. The draft standard has | |
446 | * not been adopted yet, but glibc2 already follows it and | |
447 | * also has socklen_t [*]. See also accept(2).'' | |
448 | * | |
449 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 450 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
451 | } |
452 | ||
453 | ||
067669da WD |
454 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
455 | { | |
ca20c7fd WD |
456 | #ifdef WNOHANG |
457 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
458 | #endif | |
44e604f4 | 459 | #ifndef HAVE_SIGACTION |
cb984e62 | 460 | signal(SIGCHLD, sigchld_handler); |
2b28968d | 461 | #endif |
ca20c7fd WD |
462 | } |
463 | ||
464 | ||
39993af5 | 465 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e | 466 | { |
b0fd253a | 467 | fd_set deffds; |
d8d36af4 | 468 | int *sp, maxfd, i; |
f0fca04e | 469 | |
44e604f4 | 470 | #ifdef HAVE_SIGACTION |
2b28968d WD |
471 | sigact.sa_flags = SA_NOCLDSTOP; |
472 | #endif | |
473 | ||
f0fca04e | 474 | /* open an incoming socket */ |
b0fd253a WD |
475 | sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
476 | if (sp == NULL) | |
65417579 | 477 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
478 | |
479 | /* ready to listen */ | |
b0fd253a | 480 | FD_ZERO(&deffds); |
2c7d63c7 WD |
481 | for (i = 0, maxfd = -1; sp[i] >= 0; i++) { |
482 | if (listen(sp[i], 5) < 0) { | |
d62bcc17 | 483 | rsyserr(FERROR, errno, "listen() on socket failed"); |
4f5b0756 | 484 | #ifdef INET6 |
2c7d63c7 WD |
485 | if (errno == EADDRINUSE && i > 0) { |
486 | rprintf(FINFO, | |
880570f2 | 487 | "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); |
2c7d63c7 WD |
488 | } |
489 | #endif | |
b0fd253a WD |
490 | exit_cleanup(RERR_SOCKETIO); |
491 | } | |
492 | FD_SET(sp[i], &deffds); | |
493 | if (maxfd < sp[i]) | |
494 | maxfd = sp[i]; | |
f0fca04e AT |
495 | } |
496 | ||
f0fca04e | 497 | /* now accept incoming connections - forking a new process |
a3a84107 | 498 | * for each incoming connection */ |
f0fca04e AT |
499 | while (1) { |
500 | fd_set fds; | |
c4a5c57d | 501 | pid_t pid; |
f0fca04e | 502 | int fd; |
2d6dbe29 | 503 | struct sockaddr_storage addr; |
d54765c4 | 504 | socklen_t addrlen = sizeof addr; |
f0fca04e | 505 | |
15b84e14 | 506 | /* close log file before the potentially very long select so |
a3a84107 WD |
507 | * file can be trimmed by another process instead of growing |
508 | * forever */ | |
8ee6adef | 509 | logfile_close(); |
45a83540 | 510 | |
b0fd253a WD |
511 | #ifdef FD_COPY |
512 | FD_COPY(&deffds, &fds); | |
513 | #else | |
514 | fds = deffds; | |
515 | #endif | |
f0fca04e | 516 | |
b0fd253a | 517 | if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) |
9c07d253 | 518 | continue; |
f0fca04e | 519 | |
2c7d63c7 | 520 | for (i = 0, fd = -1; sp[i] >= 0; i++) { |
b0fd253a WD |
521 | if (FD_ISSET(sp[i], &fds)) { |
522 | fd = accept(sp[i], (struct sockaddr *)&addr, | |
523 | &addrlen); | |
524 | break; | |
525 | } | |
526 | } | |
f0fca04e | 527 | |
b0fd253a | 528 | if (fd < 0) |
9c07d253 | 529 | continue; |
f0fca04e | 530 | |
2b28968d | 531 | SIGACTION(SIGCHLD, sigchld_handler); |
31f440e6 | 532 | |
c4a5c57d | 533 | if ((pid = fork()) == 0) { |
9f639210 | 534 | int ret; |
2c7d63c7 WD |
535 | for (i = 0; sp[i] >= 0; i++) |
536 | close(sp[i]); | |
1da05366 | 537 | /* Re-open log file in child before possibly giving |
8ee6adef WD |
538 | * up privileges (see logfile_close() above). */ |
539 | logfile_reopen(); | |
9f639210 DD |
540 | ret = fn(fd, fd); |
541 | close_all(); | |
542 | _exit(ret); | |
c4a5c57d | 543 | } else if (pid < 0) { |
d62bcc17 WD |
544 | rsyserr(FERROR, errno, |
545 | "could not create child server process"); | |
c4a5c57d MP |
546 | close(fd); |
547 | /* This might have happened because we're | |
548 | * overloaded. Sleep briefly before trying to | |
549 | * accept again. */ | |
550 | sleep(2); | |
bd37c666 | 551 | } else { |
79845f28 | 552 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 553 | close(fd); |
f0fca04e | 554 | } |
f0fca04e | 555 | } |
f0fca04e AT |
556 | } |
557 | ||
558 | ||
559 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
560 | ||
561 | struct | |
562 | { | |
563 | char *name; | |
564 | int level; | |
565 | int option; | |
566 | int value; | |
567 | int opttype; | |
568 | } socket_options[] = { | |
569 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
570 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
571 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
572 | #ifdef TCP_NODELAY | |
573 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
574 | #endif | |
575 | #ifdef IPTOS_LOWDELAY | |
576 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
577 | #endif | |
578 | #ifdef IPTOS_THROUGHPUT | |
579 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
580 | #endif | |
581 | #ifdef SO_SNDBUF | |
582 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
583 | #endif | |
584 | #ifdef SO_RCVBUF | |
585 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
586 | #endif | |
587 | #ifdef SO_SNDLOWAT | |
588 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
589 | #endif | |
590 | #ifdef SO_RCVLOWAT | |
591 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
592 | #endif | |
593 | #ifdef SO_SNDTIMEO | |
594 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
595 | #endif | |
596 | #ifdef SO_RCVTIMEO | |
597 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
598 | #endif | |
599 | {NULL,0,0,0,0}}; | |
600 | ||
9c07d253 | 601 | |
f0fca04e | 602 | |
a7dc44d2 MP |
603 | /** |
604 | * Set user socket options | |
605 | **/ | |
f0fca04e AT |
606 | void set_socket_options(int fd, char *options) |
607 | { | |
608 | char *tok; | |
9c07d253 WD |
609 | |
610 | if (!options || !*options) | |
611 | return; | |
a6801c39 | 612 | |
f0fca04e | 613 | options = strdup(options); |
f0fca04e | 614 | |
9c07d253 WD |
615 | if (!options) |
616 | out_of_memory("set_socket_options"); | |
617 | ||
618 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
619 | int ret=0,i; |
620 | int value = 1; | |
621 | char *p; | |
622 | int got_value = 0; | |
623 | ||
624 | if ((p = strchr(tok,'='))) { | |
625 | *p = 0; | |
626 | value = atoi(p+1); | |
627 | got_value = 1; | |
628 | } | |
629 | ||
9c07d253 | 630 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
631 | if (strcmp(socket_options[i].name,tok)==0) |
632 | break; | |
9c07d253 | 633 | } |
f0fca04e AT |
634 | |
635 | if (!socket_options[i].name) { | |
636 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
637 | continue; | |
638 | } | |
639 | ||
640 | switch (socket_options[i].opttype) { | |
641 | case OPT_BOOL: | |
642 | case OPT_INT: | |
643 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
644 | socket_options[i].option, |
645 | (char *)&value, sizeof (int)); | |
f0fca04e | 646 | break; |
9c07d253 | 647 | |
f0fca04e AT |
648 | case OPT_ON: |
649 | if (got_value) | |
4ccfd96c | 650 | rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); |
f0fca04e AT |
651 | |
652 | { | |
653 | int on = socket_options[i].value; | |
654 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
655 | socket_options[i].option, |
656 | (char *)&on, sizeof (int)); | |
f0fca04e | 657 | } |
9c07d253 | 658 | break; |
f0fca04e | 659 | } |
9c07d253 | 660 | |
d62bcc17 WD |
661 | if (ret != 0) { |
662 | rsyserr(FERROR, errno, | |
663 | "failed to set socket option %s", tok); | |
664 | } | |
f0fca04e AT |
665 | } |
666 | ||
667 | free(options); | |
668 | } | |
669 | ||
a7dc44d2 MP |
670 | /** |
671 | * Become a daemon, discarding the controlling terminal | |
672 | **/ | |
f0fca04e AT |
673 | void become_daemon(void) |
674 | { | |
b11ed3b1 AT |
675 | int i; |
676 | ||
c46ded46 | 677 | if (fork()) { |
f0fca04e | 678 | _exit(0); |
c46ded46 | 679 | } |
f0fca04e AT |
680 | |
681 | /* detach from the terminal */ | |
4f5b0756 | 682 | #ifdef HAVE_SETSID |
f0fca04e | 683 | setsid(); |
4f5b0756 | 684 | #elif defined TIOCNOTTY |
c46ded46 AT |
685 | i = open("/dev/tty", O_RDWR); |
686 | if (i >= 0) { | |
9c07d253 | 687 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 688 | close(i); |
f0fca04e | 689 | } |
f0fca04e | 690 | #endif |
b11ed3b1 | 691 | /* make sure that stdin, stdout an stderr don't stuff things |
a3a84107 | 692 | * up (library functions, for example) */ |
9c07d253 WD |
693 | for (i = 0; i < 3; i++) { |
694 | close(i); | |
b11ed3b1 AT |
695 | open("/dev/null", O_RDWR); |
696 | } | |
bc2e93eb | 697 | } |
ff8b29b8 | 698 | |
eecd22ff | 699 | |
a7dc44d2 MP |
700 | /** |
701 | * This is like socketpair but uses tcp. It is used by the Samba | |
702 | * regression test code. | |
9c07d253 | 703 | * |
a7dc44d2 MP |
704 | * The function guarantees that nobody else can attach to the socket, |
705 | * or if they do that this function fails and the socket gets closed | |
706 | * returns 0 on success, -1 on failure the resulting file descriptors | |
707 | * are symmetrical. | |
708 | **/ | |
eecd22ff MP |
709 | static int socketpair_tcp(int fd[2]) |
710 | { | |
711 | int listener; | |
712 | struct sockaddr_in sock; | |
713 | struct sockaddr_in sock2; | |
a3a84107 | 714 | socklen_t socklen = sizeof sock; |
eb8ffa90 | 715 | int connect_done = 0; |
9c07d253 | 716 | |
eecd22ff MP |
717 | fd[0] = fd[1] = listener = -1; |
718 | ||
a3a84107 | 719 | memset(&sock, 0, sizeof sock); |
9c07d253 WD |
720 | |
721 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
722 | goto failed; | |
eecd22ff | 723 | |
a3a84107 | 724 | memset(&sock2, 0, sizeof sock2); |
4f5b0756 | 725 | #ifdef HAVE_SOCKADDR_IN_LEN |
a3a84107 | 726 | sock2.sin_len = sizeof sock2; |
eecd22ff | 727 | #endif |
a3a84107 | 728 | sock2.sin_family = PF_INET; |
eecd22ff | 729 | |
a3a84107 | 730 | bind(listener, (struct sockaddr *)&sock2, sizeof sock2); |
eecd22ff | 731 | |
9c07d253 WD |
732 | if (listen(listener, 1) != 0) |
733 | goto failed; | |
eecd22ff | 734 | |
9c07d253 WD |
735 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
736 | goto failed; | |
eecd22ff | 737 | |
9c07d253 WD |
738 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
739 | goto failed; | |
eecd22ff MP |
740 | |
741 | set_nonblocking(fd[1]); | |
742 | ||
743 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
744 | ||
a3a84107 | 745 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { |
9c07d253 WD |
746 | if (errno != EINPROGRESS) |
747 | goto failed; | |
748 | } else | |
eecd22ff | 749 | connect_done = 1; |
eecd22ff | 750 | |
9c07d253 WD |
751 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
752 | goto failed; | |
eecd22ff MP |
753 | |
754 | close(listener); | |
ab217f7f WD |
755 | listener = -1; |
756 | ||
757 | set_blocking(fd[1]); | |
758 | ||
eecd22ff | 759 | if (connect_done == 0) { |
a3a84107 | 760 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 |
9c07d253 WD |
761 | && errno != EISCONN) |
762 | goto failed; | |
eecd22ff MP |
763 | } |
764 | ||
eecd22ff MP |
765 | /* all OK! */ |
766 | return 0; | |
767 | ||
768 | failed: | |
9c07d253 WD |
769 | if (fd[0] != -1) |
770 | close(fd[0]); | |
771 | if (fd[1] != -1) | |
772 | close(fd[1]); | |
773 | if (listener != -1) | |
774 | close(listener); | |
eecd22ff MP |
775 | return -1; |
776 | } | |
777 | ||
778 | ||
d02984bb MP |
779 | |
780 | /** | |
781 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
782 | * stdin and stdout. This is used to fake a connection to a daemon |
783 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
784 | * |
785 | * @return a socket which is attached to a subprocess running | |
786 | * "prog". stdin and stdout are attached. stderr is left attached to | |
787 | * the original stderr | |
788 | **/ | |
eecd22ff MP |
789 | int sock_exec(const char *prog) |
790 | { | |
791 | int fd[2]; | |
9c07d253 | 792 | |
eecd22ff | 793 | if (socketpair_tcp(fd) != 0) { |
d62bcc17 | 794 | rsyserr(FERROR, errno, "socketpair_tcp failed"); |
eecd22ff MP |
795 | return -1; |
796 | } | |
df5cd107 WD |
797 | if (verbose >= 2) |
798 | rprintf(FINFO, "Running socket program: \"%s\"\n", prog); | |
eecd22ff MP |
799 | if (fork() == 0) { |
800 | close(fd[0]); | |
801 | close(0); | |
802 | close(1); | |
803 | dup(fd[1]); | |
804 | dup(fd[1]); | |
9c07d253 | 805 | exit(system(prog)); |
eecd22ff | 806 | } |
9c07d253 | 807 | close(fd[1]); |
eecd22ff MP |
808 | return fd[0]; |
809 | } |