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> | |
ba2133d6 | 6 | * Copyright (C) 2003-2007 Wayne Davison |
0f78b815 WD |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
4fd842f9 | 9 | * it under the terms of the GNU General Public License version 3 as |
ba2133d6 | 10 | * published by the Free Software Foundation. |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 WD |
19 | */ |
20 | ||
21 | /* This file is now converted to use the new-style getaddrinfo() | |
362099a5 MP |
22 | * interface, which supports IPv6 but is also supported on recent |
23 | * IPv4-only machines. On systems that don't have that interface, we | |
0f78b815 | 24 | * emulate it using the KAME implementation. */ |
bc2e93eb | 25 | |
f0fca04e | 26 | #include "rsync.h" |
5899b8cf WD |
27 | #include <netinet/in_systm.h> |
28 | #include <netinet/ip.h> | |
0f5c1c19 | 29 | #include <netinet/tcp.h> |
f0fca04e | 30 | |
2c7d63c7 WD |
31 | extern char *bind_address; |
32 | extern int default_af_hint; | |
9a5a8673 | 33 | |
44e604f4 | 34 | #ifdef HAVE_SIGACTION |
2b28968d WD |
35 | static struct sigaction sigact; |
36 | #endif | |
37 | ||
a7dc44d2 MP |
38 | /** |
39 | * Establish a proxy connection on an open socket to a web proxy by | |
a3a84107 WD |
40 | * using the CONNECT method. If proxy_user and proxy_pass are not NULL, |
41 | * they are used to authenticate to the proxy using the "Basic" | |
42 | * proxy-authorization protocol | |
a7dc44d2 | 43 | **/ |
a3a84107 WD |
44 | static int establish_proxy_connection(int fd, char *host, int port, |
45 | char *proxy_user, char *proxy_pass) | |
4c3b4b25 | 46 | { |
a3a84107 WD |
47 | char *cp, buffer[1024]; |
48 | char *authhdr, authbuf[1024]; | |
49 | int len; | |
50 | ||
51 | if (proxy_user && proxy_pass) { | |
893c4cc0 WD |
52 | stringjoin(buffer, sizeof buffer, |
53 | proxy_user, ":", proxy_pass, NULL); | |
a3a84107 | 54 | len = strlen(buffer); |
4c3b4b25 | 55 | |
8030b28f | 56 | if ((len*8 + 5) / 6 >= (int)sizeof authbuf - 3) { |
a3a84107 WD |
57 | rprintf(FERROR, |
58 | "authentication information is too long\n"); | |
59 | return -1; | |
60 | } | |
61 | ||
6854bf69 | 62 | base64_encode(buffer, len, authbuf, 1); |
a3a84107 WD |
63 | authhdr = "\r\nProxy-Authorization: Basic "; |
64 | } else { | |
65 | *authbuf = '\0'; | |
66 | authhdr = ""; | |
67 | } | |
68 | ||
69 | snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", | |
70 | host, port, authhdr, authbuf); | |
71 | len = strlen(buffer); | |
72 | if (write(fd, buffer, len) != len) { | |
d62bcc17 | 73 | rsyserr(FERROR, errno, "failed to write to proxy"); |
4c3b4b25 AT |
74 | return -1; |
75 | } | |
76 | ||
a3a84107 | 77 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 78 | if (read(fd, cp, 1) != 1) { |
d62bcc17 | 79 | rsyserr(FERROR, errno, "failed to read from proxy"); |
4c3b4b25 AT |
80 | return -1; |
81 | } | |
82 | if (*cp == '\n') | |
83 | break; | |
84 | } | |
85 | ||
86 | if (*cp != '\n') | |
87 | cp++; | |
88 | *cp-- = '\0'; | |
89 | if (*cp == '\r') | |
90 | *cp = '\0'; | |
91 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
4ccfd96c | 92 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
93 | buffer); |
94 | return -1; | |
95 | } | |
2dc7b8bd | 96 | for (cp = &buffer[5]; isDigit(cp) || *cp == '.'; cp++) {} |
4c3b4b25 AT |
97 | while (*cp == ' ') |
98 | cp++; | |
99 | if (*cp != '2') { | |
4ccfd96c | 100 | rprintf(FERROR, "bad response from proxy -- %s\n", |
4c3b4b25 AT |
101 | buffer); |
102 | return -1; | |
103 | } | |
104 | /* throw away the rest of the HTTP header */ | |
105 | while (1) { | |
a3a84107 | 106 | for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { |
4c3b4b25 | 107 | if (read(fd, cp, 1) != 1) { |
d62bcc17 WD |
108 | rsyserr(FERROR, errno, |
109 | "failed to read from proxy"); | |
4c3b4b25 AT |
110 | return -1; |
111 | } | |
112 | if (*cp == '\n') | |
113 | break; | |
114 | } | |
9c07d253 | 115 | if (cp > buffer && *cp == '\n') |
4c3b4b25 | 116 | cp--; |
9c07d253 | 117 | if (cp == buffer && (*cp == '\n' || *cp == '\r')) |
4c3b4b25 AT |
118 | break; |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | ||
f8be7d42 MP |
124 | /** |
125 | * Try to set the local address for a newly-created socket. Return -1 | |
126 | * if this fails. | |
127 | **/ | |
e028b9ff | 128 | int try_bind_local(int s, int ai_family, int ai_socktype, |
4313d6f9 | 129 | const char *bind_addr) |
f8be7d42 MP |
130 | { |
131 | int error; | |
132 | struct addrinfo bhints, *bres_all, *r; | |
133 | ||
a3a84107 | 134 | memset(&bhints, 0, sizeof bhints); |
f8be7d42 MP |
135 | bhints.ai_family = ai_family; |
136 | bhints.ai_socktype = ai_socktype; | |
137 | bhints.ai_flags = AI_PASSIVE; | |
4313d6f9 | 138 | if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) { |
f8be7d42 | 139 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
4313d6f9 | 140 | bind_addr, gai_strerror(error)); |
f8be7d42 MP |
141 | return -1; |
142 | } | |
143 | ||
144 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 145 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 146 | continue; |
6b2d24de | 147 | freeaddrinfo(bres_all); |
f8be7d42 MP |
148 | return s; |
149 | } | |
150 | ||
151 | /* no error message; there might be some problem that allows | |
152 | * creation of the socket but not binding, perhaps if the | |
153 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 154 | freeaddrinfo(bres_all); |
f8be7d42 MP |
155 | return -1; |
156 | } | |
157 | ||
eecd22ff | 158 | |
d5d4b282 MP |
159 | /** |
160 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 161 | * |
d5d4b282 MP |
162 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
163 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 164 | * |
d5d4b282 MP |
165 | * Now that we support IPv6 we need to look up the remote machine's |
166 | * address first, using @p af_hint to set a preference for the type | |
167 | * of address. Then depending on whether it has v4 or v6 addresses we | |
168 | * try to open a connection. | |
06963d0f | 169 | * |
d5d4b282 MP |
170 | * The loop allows for machines with some addresses which may not be |
171 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
172 | * but we can get ip4 packets through. | |
173 | * | |
4313d6f9 | 174 | * @param bind_addr Local address to use. Normally NULL to bind |
d5d4b282 MP |
175 | * the wildcard address. |
176 | * | |
177 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 178 | **/ |
4313d6f9 | 179 | int open_socket_out(char *host, int port, const char *bind_addr, |
d5d4b282 | 180 | int af_hint) |
bc2e93eb | 181 | { |
f0fca04e | 182 | int type = SOCK_STREAM; |
a3a84107 | 183 | int error, s; |
06963d0f MP |
184 | struct addrinfo hints, *res0, *res; |
185 | char portbuf[10]; | |
a3a84107 | 186 | char *h, *cp; |
4c3b4b25 AT |
187 | int proxied = 0; |
188 | char buffer[1024]; | |
a3a84107 | 189 | char *proxy_user = NULL, *proxy_pass = NULL; |
4c3b4b25 | 190 | |
660c6fbd | 191 | /* if we have a RSYNC_PROXY env variable then redirect our |
a3a84107 | 192 | * connetcion via a web proxy at the given address. */ |
4c3b4b25 | 193 | h = getenv("RSYNC_PROXY"); |
9c07d253 | 194 | proxied = h != NULL && *h != '\0'; |
4c3b4b25 AT |
195 | |
196 | if (proxied) { | |
a3a84107 WD |
197 | strlcpy(buffer, h, sizeof buffer); |
198 | ||
199 | /* Is the USER:PASS@ prefix present? */ | |
b31c92ed | 200 | if ((cp = strrchr(buffer, '@')) != NULL) { |
a3a84107 WD |
201 | *cp++ = '\0'; |
202 | /* The remainder is the HOST:PORT part. */ | |
203 | h = cp; | |
204 | ||
205 | if ((cp = strchr(buffer, ':')) == NULL) { | |
206 | rprintf(FERROR, | |
207 | "invalid proxy specification: should be USER:PASS@HOST:PORT\n"); | |
208 | return -1; | |
209 | } | |
210 | *cp++ = '\0'; | |
211 | ||
212 | proxy_user = buffer; | |
213 | proxy_pass = cp; | |
214 | } else { | |
215 | /* The whole buffer is the HOST:PORT part. */ | |
216 | h = buffer; | |
217 | } | |
218 | ||
219 | if ((cp = strchr(h, ':')) == NULL) { | |
660c6fbd MP |
220 | rprintf(FERROR, |
221 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
222 | return -1; |
223 | } | |
224 | *cp++ = '\0'; | |
a3a84107 | 225 | strlcpy(portbuf, cp, sizeof portbuf); |
7bea78ce MP |
226 | if (verbose >= 2) { |
227 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
228 | h, portbuf); | |
229 | } | |
4c3b4b25 | 230 | } else { |
a3a84107 | 231 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4c3b4b25 | 232 | h = host; |
4c3b4b25 | 233 | } |
f0fca04e | 234 | |
a3a84107 | 235 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 236 | hints.ai_family = af_hint; |
06963d0f MP |
237 | hints.ai_socktype = type; |
238 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
239 | if (error) { | |
d5d4b282 MP |
240 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
241 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
242 | return -1; |
243 | } | |
244 | ||
06963d0f | 245 | s = -1; |
2d6dbe29 MP |
246 | /* Try to connect to all addresses for this machine until we get |
247 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
248 | * addresses. We need to create a socket for each record, since the | |
249 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
250 | for (res = res0; res; res = res->ai_next) { |
251 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
252 | if (s < 0) | |
253 | continue; | |
f0fca04e | 254 | |
4313d6f9 | 255 | if (bind_addr |
a3a84107 | 256 | && try_bind_local(s, res->ai_family, type, |
4313d6f9 | 257 | bind_addr) == -1) { |
a3a84107 WD |
258 | close(s); |
259 | s = -1; | |
260 | continue; | |
261 | } | |
06963d0f MP |
262 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
263 | close(s); | |
264 | s = -1; | |
265 | continue; | |
266 | } | |
a3a84107 WD |
267 | if (proxied |
268 | && establish_proxy_connection(s, host, port, | |
269 | proxy_user, proxy_pass) != 0) { | |
06963d0f MP |
270 | close(s); |
271 | s = -1; | |
272 | continue; | |
a3a84107 WD |
273 | } |
274 | break; | |
4c3b4b25 | 275 | } |
06963d0f MP |
276 | freeaddrinfo(res0); |
277 | if (s < 0) { | |
d62bcc17 | 278 | rsyserr(FERROR, errno, "failed to connect to %s", h); |
f0fca04e AT |
279 | return -1; |
280 | } | |
06963d0f | 281 | return s; |
f0fca04e AT |
282 | } |
283 | ||
284 | ||
eecd22ff MP |
285 | /** |
286 | * Open an outgoing socket, but allow for it to be intercepted by | |
287 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
288 | * socketpair rather than really opening a socket. | |
289 | * | |
290 | * We use this primarily in testing to detect TCP flow bugs, but not | |
291 | * cause security problems by really opening remote connections. | |
292 | * | |
293 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f | 294 | * |
4313d6f9 | 295 | * @param bind_addr Local address to use. Normally NULL to get the stack default. |
eecd22ff | 296 | **/ |
4313d6f9 | 297 | int open_socket_out_wrapped(char *host, int port, const char *bind_addr, |
9c07d253 | 298 | int af_hint) |
eecd22ff | 299 | { |
df5cd107 | 300 | char *prog = getenv("RSYNC_CONNECT_PROG"); |
eecd22ff | 301 | |
df5cd107 WD |
302 | if (verbose >= 2) { |
303 | rprintf(FINFO, "%sopening tcp connection to %s port %d\n", | |
304 | prog ? "Using RSYNC_CONNECT_PROG instead of " : "", | |
305 | host, port); | |
306 | } | |
307 | if (prog) | |
9c07d253 | 308 | return sock_exec(prog); |
4313d6f9 | 309 | return open_socket_out(host, port, bind_addr, af_hint); |
eecd22ff MP |
310 | } |
311 | ||
312 | ||
313 | ||
06963d0f | 314 | /** |
2c7d63c7 WD |
315 | * Open one or more sockets for incoming data using the specified type, |
316 | * port, and address. | |
06963d0f | 317 | * |
2c7d63c7 WD |
318 | * The getaddrinfo() call may return several address results, e.g. for |
319 | * the machine's IPv4 and IPv6 name. | |
9c07d253 | 320 | * |
2c7d63c7 WD |
321 | * We return an array of file-descriptors to the sockets, with a trailing |
322 | * -1 value to indicate the end of the list. | |
9c07d253 | 323 | * |
4313d6f9 | 324 | * @param bind_addr Local address to bind, or NULL to allow it to |
06963d0f MP |
325 | * default. |
326 | **/ | |
4313d6f9 | 327 | static int *open_socket_in(int type, int port, const char *bind_addr, |
b0fd253a | 328 | int af_hint) |
f0fca04e | 329 | { |
2c7d63c7 | 330 | int one = 1; |
5c6d4632 | 331 | int s, *socks, maxs, i, ecnt; |
13e29995 | 332 | struct addrinfo hints, *all_ai, *resp; |
5c6d4632 | 333 | char portbuf[10], **errmsgs; |
06963d0f MP |
334 | int error; |
335 | ||
a3a84107 | 336 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 337 | hints.ai_family = af_hint; |
06963d0f MP |
338 | hints.ai_socktype = type; |
339 | hints.ai_flags = AI_PASSIVE; | |
a3a84107 | 340 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4313d6f9 | 341 | error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); |
06963d0f | 342 | if (error) { |
7ef6aa64 | 343 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
4313d6f9 | 344 | bind_addr, gai_strerror(error)); |
b0fd253a WD |
345 | return NULL; |
346 | } | |
347 | ||
348 | /* Count max number of sockets we might open. */ | |
349 | for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} | |
2c7d63c7 | 350 | |
5c6d4632 WD |
351 | socks = new_array(int, maxs + 1); |
352 | errmsgs = new_array(char *, maxs); | |
353 | if (!socks || !errmsgs) | |
2c7d63c7 | 354 | out_of_memory("open_socket_in"); |
06963d0f | 355 | |
13e29995 MP |
356 | /* We may not be able to create the socket, if for example the |
357 | * machine knows about IPv6 in the C library, but not in the | |
358 | * kernel. */ | |
5c6d4632 | 359 | for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) { |
13e29995 MP |
360 | s = socket(resp->ai_family, resp->ai_socktype, |
361 | resp->ai_protocol); | |
362 | ||
b0fd253a | 363 | if (s == -1) { |
5c6d4632 WD |
364 | int r = asprintf(&errmsgs[ecnt++], |
365 | "socket(%d,%d,%d) failed: %s\n", | |
366 | (int)resp->ai_family, (int)resp->ai_socktype, | |
367 | (int)resp->ai_protocol, strerror(errno)); | |
368 | if (r < 0) | |
369 | out_of_memory("open_socket_in"); | |
13e29995 MP |
370 | /* See if there's another address that will work... */ |
371 | continue; | |
b0fd253a | 372 | } |
9c07d253 | 373 | |
13e29995 MP |
374 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
375 | (char *)&one, sizeof one); | |
9c07d253 | 376 | |
b0fd253a WD |
377 | #ifdef IPV6_V6ONLY |
378 | if (resp->ai_family == AF_INET6) { | |
dcd08dc5 WD |
379 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, |
380 | (char *)&one, sizeof one) < 0 | |
381 | && default_af_hint != AF_INET6) { | |
382 | close(s); | |
383 | continue; | |
384 | } | |
b0fd253a WD |
385 | } |
386 | #endif | |
387 | ||
e028b9ff WD |
388 | /* Now we've got a socket - we need to bind it. */ |
389 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 | 390 | /* Nope, try another */ |
5c6d4632 | 391 | int r = asprintf(&errmsgs[ecnt++], |
e2d774cd WD |
392 | "bind() failed: %s (address-family %d)\n", |
393 | strerror(errno), (int)resp->ai_family); | |
5c6d4632 WD |
394 | if (r < 0) |
395 | out_of_memory("open_socket_in"); | |
13e29995 MP |
396 | close(s); |
397 | continue; | |
b8771f96 | 398 | } |
e23d790f | 399 | |
2c7d63c7 | 400 | socks[i++] = s; |
f0fca04e | 401 | } |
2c7d63c7 | 402 | socks[i] = -1; |
f0fca04e | 403 | |
b0fd253a WD |
404 | if (all_ai) |
405 | freeaddrinfo(all_ai); | |
b8771f96 | 406 | |
5c6d4632 WD |
407 | /* Only output the socket()/bind() messages if we were totally |
408 | * unsuccessful, or if the daemon is being run with -vv. */ | |
409 | for (s = 0; s < ecnt; s++) { | |
410 | if (!i || verbose > 1) | |
332cf6df | 411 | rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]), 0); |
5c6d4632 WD |
412 | free(errmsgs[s]); |
413 | } | |
414 | free(errmsgs); | |
415 | ||
2c7d63c7 | 416 | if (!i) { |
b0fd253a | 417 | rprintf(FERROR, |
2c7d63c7 WD |
418 | "unable to bind any inbound sockets on port %d\n", |
419 | port); | |
b0fd253a WD |
420 | free(socks); |
421 | return NULL; | |
422 | } | |
423 | return socks; | |
f0fca04e AT |
424 | } |
425 | ||
426 | ||
7c1b4daa MP |
427 | /* |
428 | * Determine if a file descriptor is in fact a socket | |
429 | */ | |
f0fca04e AT |
430 | int is_a_socket(int fd) |
431 | { | |
ac2a1a44 | 432 | int v; |
a3a84107 WD |
433 | socklen_t l = sizeof (int); |
434 | ||
435 | /* Parameters to getsockopt, setsockopt etc are very | |
436 | * unstandardized across platforms, so don't be surprised if | |
437 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. | |
438 | * It seems they all eventually get the right idea. | |
439 | * | |
440 | * Debian says: ``The fifth argument of getsockopt and | |
441 | * setsockopt is in reality an int [*] (and this is what BSD | |
442 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
443 | * resulted in the present socklen_t. The draft standard has | |
444 | * not been adopted yet, but glibc2 already follows it and | |
445 | * also has socklen_t [*]. See also accept(2).'' | |
446 | * | |
447 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 448 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
449 | } |
450 | ||
451 | ||
067669da WD |
452 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
453 | { | |
ca20c7fd WD |
454 | #ifdef WNOHANG |
455 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
456 | #endif | |
44e604f4 | 457 | #ifndef HAVE_SIGACTION |
cb984e62 | 458 | signal(SIGCHLD, sigchld_handler); |
2b28968d | 459 | #endif |
ca20c7fd WD |
460 | } |
461 | ||
462 | ||
39993af5 | 463 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e | 464 | { |
b0fd253a | 465 | fd_set deffds; |
d8d36af4 | 466 | int *sp, maxfd, i; |
f0fca04e | 467 | |
44e604f4 | 468 | #ifdef HAVE_SIGACTION |
2b28968d WD |
469 | sigact.sa_flags = SA_NOCLDSTOP; |
470 | #endif | |
471 | ||
f0fca04e | 472 | /* open an incoming socket */ |
b0fd253a WD |
473 | sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
474 | if (sp == NULL) | |
65417579 | 475 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
476 | |
477 | /* ready to listen */ | |
b0fd253a | 478 | FD_ZERO(&deffds); |
2c7d63c7 WD |
479 | for (i = 0, maxfd = -1; sp[i] >= 0; i++) { |
480 | if (listen(sp[i], 5) < 0) { | |
d62bcc17 | 481 | rsyserr(FERROR, errno, "listen() on socket failed"); |
4f5b0756 | 482 | #ifdef INET6 |
2c7d63c7 WD |
483 | if (errno == EADDRINUSE && i > 0) { |
484 | rprintf(FINFO, | |
880570f2 | 485 | "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); |
2c7d63c7 WD |
486 | } |
487 | #endif | |
b0fd253a WD |
488 | exit_cleanup(RERR_SOCKETIO); |
489 | } | |
490 | FD_SET(sp[i], &deffds); | |
491 | if (maxfd < sp[i]) | |
492 | maxfd = sp[i]; | |
f0fca04e AT |
493 | } |
494 | ||
f0fca04e | 495 | /* now accept incoming connections - forking a new process |
a3a84107 | 496 | * for each incoming connection */ |
f0fca04e AT |
497 | while (1) { |
498 | fd_set fds; | |
c4a5c57d | 499 | pid_t pid; |
f0fca04e | 500 | int fd; |
2d6dbe29 | 501 | struct sockaddr_storage addr; |
d54765c4 | 502 | socklen_t addrlen = sizeof addr; |
f0fca04e | 503 | |
15b84e14 | 504 | /* close log file before the potentially very long select so |
a3a84107 WD |
505 | * file can be trimmed by another process instead of growing |
506 | * forever */ | |
8ee6adef | 507 | logfile_close(); |
45a83540 | 508 | |
b0fd253a WD |
509 | #ifdef FD_COPY |
510 | FD_COPY(&deffds, &fds); | |
511 | #else | |
512 | fds = deffds; | |
513 | #endif | |
f0fca04e | 514 | |
b0fd253a | 515 | if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) |
9c07d253 | 516 | continue; |
f0fca04e | 517 | |
2c7d63c7 | 518 | for (i = 0, fd = -1; sp[i] >= 0; i++) { |
b0fd253a WD |
519 | if (FD_ISSET(sp[i], &fds)) { |
520 | fd = accept(sp[i], (struct sockaddr *)&addr, | |
521 | &addrlen); | |
522 | break; | |
523 | } | |
524 | } | |
f0fca04e | 525 | |
b0fd253a | 526 | if (fd < 0) |
9c07d253 | 527 | continue; |
f0fca04e | 528 | |
2b28968d | 529 | SIGACTION(SIGCHLD, sigchld_handler); |
31f440e6 | 530 | |
c4a5c57d | 531 | if ((pid = fork()) == 0) { |
9f639210 | 532 | int ret; |
2c7d63c7 WD |
533 | for (i = 0; sp[i] >= 0; i++) |
534 | close(sp[i]); | |
1da05366 | 535 | /* Re-open log file in child before possibly giving |
8ee6adef WD |
536 | * up privileges (see logfile_close() above). */ |
537 | logfile_reopen(); | |
9f639210 DD |
538 | ret = fn(fd, fd); |
539 | close_all(); | |
540 | _exit(ret); | |
c4a5c57d | 541 | } else if (pid < 0) { |
d62bcc17 WD |
542 | rsyserr(FERROR, errno, |
543 | "could not create child server process"); | |
c4a5c57d MP |
544 | close(fd); |
545 | /* This might have happened because we're | |
546 | * overloaded. Sleep briefly before trying to | |
547 | * accept again. */ | |
548 | sleep(2); | |
bd37c666 | 549 | } else { |
79845f28 | 550 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 551 | close(fd); |
f0fca04e | 552 | } |
f0fca04e | 553 | } |
f0fca04e AT |
554 | } |
555 | ||
556 | ||
557 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
558 | ||
559 | struct | |
560 | { | |
561 | char *name; | |
562 | int level; | |
563 | int option; | |
564 | int value; | |
565 | int opttype; | |
566 | } socket_options[] = { | |
567 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
568 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
569 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
570 | #ifdef TCP_NODELAY | |
571 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
572 | #endif | |
573 | #ifdef IPTOS_LOWDELAY | |
574 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
575 | #endif | |
576 | #ifdef IPTOS_THROUGHPUT | |
577 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
578 | #endif | |
579 | #ifdef SO_SNDBUF | |
580 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
581 | #endif | |
582 | #ifdef SO_RCVBUF | |
583 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
584 | #endif | |
585 | #ifdef SO_SNDLOWAT | |
586 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
587 | #endif | |
588 | #ifdef SO_RCVLOWAT | |
589 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
590 | #endif | |
591 | #ifdef SO_SNDTIMEO | |
592 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
593 | #endif | |
594 | #ifdef SO_RCVTIMEO | |
595 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
596 | #endif | |
597 | {NULL,0,0,0,0}}; | |
598 | ||
9c07d253 | 599 | |
f0fca04e | 600 | |
a7dc44d2 MP |
601 | /** |
602 | * Set user socket options | |
603 | **/ | |
f0fca04e AT |
604 | void set_socket_options(int fd, char *options) |
605 | { | |
606 | char *tok; | |
9c07d253 WD |
607 | |
608 | if (!options || !*options) | |
609 | return; | |
a6801c39 | 610 | |
f0fca04e | 611 | options = strdup(options); |
f0fca04e | 612 | |
9c07d253 WD |
613 | if (!options) |
614 | out_of_memory("set_socket_options"); | |
615 | ||
616 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
617 | int ret=0,i; |
618 | int value = 1; | |
619 | char *p; | |
620 | int got_value = 0; | |
621 | ||
622 | if ((p = strchr(tok,'='))) { | |
623 | *p = 0; | |
624 | value = atoi(p+1); | |
625 | got_value = 1; | |
626 | } | |
627 | ||
9c07d253 | 628 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
629 | if (strcmp(socket_options[i].name,tok)==0) |
630 | break; | |
9c07d253 | 631 | } |
f0fca04e AT |
632 | |
633 | if (!socket_options[i].name) { | |
634 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
635 | continue; | |
636 | } | |
637 | ||
638 | switch (socket_options[i].opttype) { | |
639 | case OPT_BOOL: | |
640 | case OPT_INT: | |
641 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
642 | socket_options[i].option, |
643 | (char *)&value, sizeof (int)); | |
f0fca04e | 644 | break; |
9c07d253 | 645 | |
f0fca04e AT |
646 | case OPT_ON: |
647 | if (got_value) | |
4ccfd96c | 648 | rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); |
f0fca04e AT |
649 | |
650 | { | |
651 | int on = socket_options[i].value; | |
652 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
653 | socket_options[i].option, |
654 | (char *)&on, sizeof (int)); | |
f0fca04e | 655 | } |
9c07d253 | 656 | break; |
f0fca04e | 657 | } |
9c07d253 | 658 | |
d62bcc17 WD |
659 | if (ret != 0) { |
660 | rsyserr(FERROR, errno, | |
661 | "failed to set socket option %s", tok); | |
662 | } | |
f0fca04e AT |
663 | } |
664 | ||
665 | free(options); | |
666 | } | |
667 | ||
a7dc44d2 MP |
668 | /** |
669 | * Become a daemon, discarding the controlling terminal | |
670 | **/ | |
f0fca04e AT |
671 | void become_daemon(void) |
672 | { | |
b11ed3b1 AT |
673 | int i; |
674 | ||
c46ded46 | 675 | if (fork()) { |
f0fca04e | 676 | _exit(0); |
c46ded46 | 677 | } |
f0fca04e AT |
678 | |
679 | /* detach from the terminal */ | |
4f5b0756 | 680 | #ifdef HAVE_SETSID |
f0fca04e | 681 | setsid(); |
4f5b0756 | 682 | #elif defined TIOCNOTTY |
c46ded46 AT |
683 | i = open("/dev/tty", O_RDWR); |
684 | if (i >= 0) { | |
9c07d253 | 685 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 686 | close(i); |
f0fca04e | 687 | } |
f0fca04e | 688 | #endif |
b11ed3b1 | 689 | /* make sure that stdin, stdout an stderr don't stuff things |
a3a84107 | 690 | * up (library functions, for example) */ |
9c07d253 WD |
691 | for (i = 0; i < 3; i++) { |
692 | close(i); | |
b11ed3b1 AT |
693 | open("/dev/null", O_RDWR); |
694 | } | |
bc2e93eb | 695 | } |
ff8b29b8 | 696 | |
eecd22ff | 697 | |
a7dc44d2 MP |
698 | /** |
699 | * This is like socketpair but uses tcp. It is used by the Samba | |
700 | * regression test code. | |
9c07d253 | 701 | * |
a7dc44d2 MP |
702 | * The function guarantees that nobody else can attach to the socket, |
703 | * or if they do that this function fails and the socket gets closed | |
704 | * returns 0 on success, -1 on failure the resulting file descriptors | |
705 | * are symmetrical. | |
706 | **/ | |
eecd22ff MP |
707 | static int socketpair_tcp(int fd[2]) |
708 | { | |
709 | int listener; | |
710 | struct sockaddr_in sock; | |
711 | struct sockaddr_in sock2; | |
a3a84107 | 712 | socklen_t socklen = sizeof sock; |
eb8ffa90 | 713 | int connect_done = 0; |
9c07d253 | 714 | |
eecd22ff MP |
715 | fd[0] = fd[1] = listener = -1; |
716 | ||
a3a84107 | 717 | memset(&sock, 0, sizeof sock); |
9c07d253 WD |
718 | |
719 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
720 | goto failed; | |
eecd22ff | 721 | |
a3a84107 | 722 | memset(&sock2, 0, sizeof sock2); |
4f5b0756 | 723 | #ifdef HAVE_SOCKADDR_IN_LEN |
a3a84107 | 724 | sock2.sin_len = sizeof sock2; |
eecd22ff | 725 | #endif |
a3a84107 | 726 | sock2.sin_family = PF_INET; |
eecd22ff | 727 | |
a3a84107 | 728 | bind(listener, (struct sockaddr *)&sock2, sizeof sock2); |
eecd22ff | 729 | |
9c07d253 WD |
730 | if (listen(listener, 1) != 0) |
731 | goto failed; | |
eecd22ff | 732 | |
9c07d253 WD |
733 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
734 | goto failed; | |
eecd22ff | 735 | |
9c07d253 WD |
736 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
737 | goto failed; | |
eecd22ff MP |
738 | |
739 | set_nonblocking(fd[1]); | |
740 | ||
741 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
742 | ||
a3a84107 | 743 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { |
9c07d253 WD |
744 | if (errno != EINPROGRESS) |
745 | goto failed; | |
746 | } else | |
eecd22ff | 747 | connect_done = 1; |
eecd22ff | 748 | |
9c07d253 WD |
749 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
750 | goto failed; | |
eecd22ff MP |
751 | |
752 | close(listener); | |
ab217f7f WD |
753 | listener = -1; |
754 | ||
755 | set_blocking(fd[1]); | |
756 | ||
eecd22ff | 757 | if (connect_done == 0) { |
a3a84107 | 758 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 |
9c07d253 WD |
759 | && errno != EISCONN) |
760 | goto failed; | |
eecd22ff MP |
761 | } |
762 | ||
eecd22ff MP |
763 | /* all OK! */ |
764 | return 0; | |
765 | ||
766 | failed: | |
9c07d253 WD |
767 | if (fd[0] != -1) |
768 | close(fd[0]); | |
769 | if (fd[1] != -1) | |
770 | close(fd[1]); | |
771 | if (listener != -1) | |
772 | close(listener); | |
eecd22ff MP |
773 | return -1; |
774 | } | |
775 | ||
776 | ||
d02984bb MP |
777 | |
778 | /** | |
779 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
780 | * stdin and stdout. This is used to fake a connection to a daemon |
781 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
782 | * |
783 | * @return a socket which is attached to a subprocess running | |
784 | * "prog". stdin and stdout are attached. stderr is left attached to | |
785 | * the original stderr | |
786 | **/ | |
eecd22ff MP |
787 | int sock_exec(const char *prog) |
788 | { | |
789 | int fd[2]; | |
9c07d253 | 790 | |
eecd22ff | 791 | if (socketpair_tcp(fd) != 0) { |
d62bcc17 | 792 | rsyserr(FERROR, errno, "socketpair_tcp failed"); |
eecd22ff MP |
793 | return -1; |
794 | } | |
df5cd107 WD |
795 | if (verbose >= 2) |
796 | rprintf(FINFO, "Running socket program: \"%s\"\n", prog); | |
eecd22ff MP |
797 | if (fork() == 0) { |
798 | close(fd[0]); | |
799 | close(0); | |
800 | close(1); | |
801 | dup(fd[1]); | |
802 | dup(fd[1]); | |
9c07d253 | 803 | exit(system(prog)); |
eecd22ff | 804 | } |
9c07d253 | 805 | close(fd[1]); |
eecd22ff MP |
806 | return fd[0]; |
807 | } |