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 | |
8e41b68e WD |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 3 of the License, or | |
11 | * (at your option) any later version. | |
0f78b815 WD |
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 | 18 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 19 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 WD |
20 | */ |
21 | ||
22 | /* This file is now converted to use the new-style getaddrinfo() | |
362099a5 MP |
23 | * interface, which supports IPv6 but is also supported on recent |
24 | * IPv4-only machines. On systems that don't have that interface, we | |
0f78b815 | 25 | * emulate it using the KAME implementation. */ |
bc2e93eb | 26 | |
f0fca04e | 27 | #include "rsync.h" |
1b42f628 | 28 | #include "ifuncs.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 | } | |
2dc7b8bd | 98 | for (cp = &buffer[5]; isDigit(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 | |
4eff3051 | 304 | if (prog && strchr(prog, '%')) { |
e5f1a96f WD |
305 | int hlen = strlen(host); |
306 | int len = strlen(prog) + 1; | |
307 | char *f, *t; | |
308 | for (f = prog; *f; f++) { | |
309 | if (*f != '%') | |
310 | continue; | |
311 | /* Compute more than enough room. */ | |
312 | if (f[1] == '%') | |
313 | f++; | |
314 | else | |
315 | len += hlen; | |
316 | } | |
317 | f = prog; | |
318 | if (!(prog = new_array(char, len))) | |
319 | out_of_memory("open_socket_out_wrapped"); | |
320 | for (t = prog; *f; f++) { | |
321 | if (*f == '%') { | |
322 | switch (*++f) { | |
323 | case '%': | |
324 | /* Just skips the extra '%'. */ | |
325 | break; | |
326 | case 'H': | |
327 | memcpy(t, host, hlen); | |
328 | t += hlen; | |
329 | continue; | |
330 | default: | |
331 | f--; /* pass % through */ | |
332 | break; | |
333 | } | |
334 | } | |
335 | *t++ = *f; | |
336 | } | |
337 | *t = '\0'; | |
338 | } | |
339 | ||
df5cd107 WD |
340 | if (verbose >= 2) { |
341 | rprintf(FINFO, "%sopening tcp connection to %s port %d\n", | |
342 | prog ? "Using RSYNC_CONNECT_PROG instead of " : "", | |
343 | host, port); | |
344 | } | |
345 | if (prog) | |
9c07d253 | 346 | return sock_exec(prog); |
4313d6f9 | 347 | return open_socket_out(host, port, bind_addr, af_hint); |
eecd22ff MP |
348 | } |
349 | ||
350 | ||
351 | ||
06963d0f | 352 | /** |
2c7d63c7 WD |
353 | * Open one or more sockets for incoming data using the specified type, |
354 | * port, and address. | |
06963d0f | 355 | * |
2c7d63c7 WD |
356 | * The getaddrinfo() call may return several address results, e.g. for |
357 | * the machine's IPv4 and IPv6 name. | |
9c07d253 | 358 | * |
2c7d63c7 WD |
359 | * We return an array of file-descriptors to the sockets, with a trailing |
360 | * -1 value to indicate the end of the list. | |
9c07d253 | 361 | * |
4313d6f9 | 362 | * @param bind_addr Local address to bind, or NULL to allow it to |
06963d0f MP |
363 | * default. |
364 | **/ | |
4313d6f9 | 365 | static int *open_socket_in(int type, int port, const char *bind_addr, |
b0fd253a | 366 | int af_hint) |
f0fca04e | 367 | { |
2c7d63c7 | 368 | int one = 1; |
5c6d4632 | 369 | int s, *socks, maxs, i, ecnt; |
13e29995 | 370 | struct addrinfo hints, *all_ai, *resp; |
5c6d4632 | 371 | char portbuf[10], **errmsgs; |
06963d0f MP |
372 | int error; |
373 | ||
a3a84107 | 374 | memset(&hints, 0, sizeof hints); |
d5d4b282 | 375 | hints.ai_family = af_hint; |
06963d0f MP |
376 | hints.ai_socktype = type; |
377 | hints.ai_flags = AI_PASSIVE; | |
a3a84107 | 378 | snprintf(portbuf, sizeof portbuf, "%d", port); |
4313d6f9 | 379 | error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); |
06963d0f | 380 | if (error) { |
7ef6aa64 | 381 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
4313d6f9 | 382 | bind_addr, gai_strerror(error)); |
b0fd253a WD |
383 | return NULL; |
384 | } | |
385 | ||
386 | /* Count max number of sockets we might open. */ | |
387 | for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} | |
2c7d63c7 | 388 | |
5c6d4632 WD |
389 | socks = new_array(int, maxs + 1); |
390 | errmsgs = new_array(char *, maxs); | |
391 | if (!socks || !errmsgs) | |
2c7d63c7 | 392 | out_of_memory("open_socket_in"); |
06963d0f | 393 | |
13e29995 MP |
394 | /* We may not be able to create the socket, if for example the |
395 | * machine knows about IPv6 in the C library, but not in the | |
396 | * kernel. */ | |
5c6d4632 | 397 | for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) { |
13e29995 MP |
398 | s = socket(resp->ai_family, resp->ai_socktype, |
399 | resp->ai_protocol); | |
400 | ||
b0fd253a | 401 | if (s == -1) { |
5c6d4632 WD |
402 | int r = asprintf(&errmsgs[ecnt++], |
403 | "socket(%d,%d,%d) failed: %s\n", | |
404 | (int)resp->ai_family, (int)resp->ai_socktype, | |
405 | (int)resp->ai_protocol, strerror(errno)); | |
406 | if (r < 0) | |
407 | out_of_memory("open_socket_in"); | |
13e29995 MP |
408 | /* See if there's another address that will work... */ |
409 | continue; | |
b0fd253a | 410 | } |
9c07d253 | 411 | |
13e29995 MP |
412 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
413 | (char *)&one, sizeof one); | |
9c07d253 | 414 | |
b0fd253a WD |
415 | #ifdef IPV6_V6ONLY |
416 | if (resp->ai_family == AF_INET6) { | |
dcd08dc5 WD |
417 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, |
418 | (char *)&one, sizeof one) < 0 | |
419 | && default_af_hint != AF_INET6) { | |
420 | close(s); | |
421 | continue; | |
422 | } | |
b0fd253a WD |
423 | } |
424 | #endif | |
425 | ||
e028b9ff WD |
426 | /* Now we've got a socket - we need to bind it. */ |
427 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 | 428 | /* Nope, try another */ |
5c6d4632 | 429 | int r = asprintf(&errmsgs[ecnt++], |
e2d774cd WD |
430 | "bind() failed: %s (address-family %d)\n", |
431 | strerror(errno), (int)resp->ai_family); | |
5c6d4632 WD |
432 | if (r < 0) |
433 | out_of_memory("open_socket_in"); | |
13e29995 MP |
434 | close(s); |
435 | continue; | |
b8771f96 | 436 | } |
e23d790f | 437 | |
2c7d63c7 | 438 | socks[i++] = s; |
f0fca04e | 439 | } |
2c7d63c7 | 440 | socks[i] = -1; |
f0fca04e | 441 | |
b0fd253a WD |
442 | if (all_ai) |
443 | freeaddrinfo(all_ai); | |
b8771f96 | 444 | |
5c6d4632 WD |
445 | /* Only output the socket()/bind() messages if we were totally |
446 | * unsuccessful, or if the daemon is being run with -vv. */ | |
447 | for (s = 0; s < ecnt; s++) { | |
448 | if (!i || verbose > 1) | |
332cf6df | 449 | rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]), 0); |
5c6d4632 WD |
450 | free(errmsgs[s]); |
451 | } | |
452 | free(errmsgs); | |
453 | ||
2c7d63c7 | 454 | if (!i) { |
b0fd253a | 455 | rprintf(FERROR, |
2c7d63c7 WD |
456 | "unable to bind any inbound sockets on port %d\n", |
457 | port); | |
b0fd253a WD |
458 | free(socks); |
459 | return NULL; | |
460 | } | |
461 | return socks; | |
f0fca04e AT |
462 | } |
463 | ||
464 | ||
7c1b4daa MP |
465 | /* |
466 | * Determine if a file descriptor is in fact a socket | |
467 | */ | |
f0fca04e AT |
468 | int is_a_socket(int fd) |
469 | { | |
ac2a1a44 | 470 | int v; |
a3a84107 WD |
471 | socklen_t l = sizeof (int); |
472 | ||
473 | /* Parameters to getsockopt, setsockopt etc are very | |
474 | * unstandardized across platforms, so don't be surprised if | |
475 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. | |
476 | * It seems they all eventually get the right idea. | |
477 | * | |
478 | * Debian says: ``The fifth argument of getsockopt and | |
479 | * setsockopt is in reality an int [*] (and this is what BSD | |
480 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
481 | * resulted in the present socklen_t. The draft standard has | |
482 | * not been adopted yet, but glibc2 already follows it and | |
483 | * also has socklen_t [*]. See also accept(2).'' | |
484 | * | |
485 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 486 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
487 | } |
488 | ||
489 | ||
067669da WD |
490 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
491 | { | |
ca20c7fd WD |
492 | #ifdef WNOHANG |
493 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
494 | #endif | |
44e604f4 | 495 | #ifndef HAVE_SIGACTION |
cb984e62 | 496 | signal(SIGCHLD, sigchld_handler); |
2b28968d | 497 | #endif |
ca20c7fd WD |
498 | } |
499 | ||
500 | ||
39993af5 | 501 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e | 502 | { |
b0fd253a | 503 | fd_set deffds; |
d8d36af4 | 504 | int *sp, maxfd, i; |
f0fca04e | 505 | |
44e604f4 | 506 | #ifdef HAVE_SIGACTION |
2b28968d WD |
507 | sigact.sa_flags = SA_NOCLDSTOP; |
508 | #endif | |
509 | ||
f0fca04e | 510 | /* open an incoming socket */ |
b0fd253a WD |
511 | sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
512 | if (sp == NULL) | |
65417579 | 513 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
514 | |
515 | /* ready to listen */ | |
b0fd253a | 516 | FD_ZERO(&deffds); |
2c7d63c7 WD |
517 | for (i = 0, maxfd = -1; sp[i] >= 0; i++) { |
518 | if (listen(sp[i], 5) < 0) { | |
d62bcc17 | 519 | rsyserr(FERROR, errno, "listen() on socket failed"); |
4f5b0756 | 520 | #ifdef INET6 |
2c7d63c7 WD |
521 | if (errno == EADDRINUSE && i > 0) { |
522 | rprintf(FINFO, | |
880570f2 | 523 | "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); |
2c7d63c7 WD |
524 | } |
525 | #endif | |
b0fd253a WD |
526 | exit_cleanup(RERR_SOCKETIO); |
527 | } | |
528 | FD_SET(sp[i], &deffds); | |
529 | if (maxfd < sp[i]) | |
530 | maxfd = sp[i]; | |
f0fca04e AT |
531 | } |
532 | ||
f0fca04e | 533 | /* now accept incoming connections - forking a new process |
a3a84107 | 534 | * for each incoming connection */ |
f0fca04e AT |
535 | while (1) { |
536 | fd_set fds; | |
c4a5c57d | 537 | pid_t pid; |
f0fca04e | 538 | int fd; |
2d6dbe29 | 539 | struct sockaddr_storage addr; |
d54765c4 | 540 | socklen_t addrlen = sizeof addr; |
f0fca04e | 541 | |
15b84e14 | 542 | /* close log file before the potentially very long select so |
a3a84107 WD |
543 | * file can be trimmed by another process instead of growing |
544 | * forever */ | |
8ee6adef | 545 | logfile_close(); |
45a83540 | 546 | |
b0fd253a WD |
547 | #ifdef FD_COPY |
548 | FD_COPY(&deffds, &fds); | |
549 | #else | |
550 | fds = deffds; | |
551 | #endif | |
f0fca04e | 552 | |
b0fd253a | 553 | if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) |
9c07d253 | 554 | continue; |
f0fca04e | 555 | |
2c7d63c7 | 556 | for (i = 0, fd = -1; sp[i] >= 0; i++) { |
b0fd253a WD |
557 | if (FD_ISSET(sp[i], &fds)) { |
558 | fd = accept(sp[i], (struct sockaddr *)&addr, | |
559 | &addrlen); | |
560 | break; | |
561 | } | |
562 | } | |
f0fca04e | 563 | |
b0fd253a | 564 | if (fd < 0) |
9c07d253 | 565 | continue; |
f0fca04e | 566 | |
2b28968d | 567 | SIGACTION(SIGCHLD, sigchld_handler); |
31f440e6 | 568 | |
c4a5c57d | 569 | if ((pid = fork()) == 0) { |
9f639210 | 570 | int ret; |
2c7d63c7 WD |
571 | for (i = 0; sp[i] >= 0; i++) |
572 | close(sp[i]); | |
1da05366 | 573 | /* Re-open log file in child before possibly giving |
8ee6adef WD |
574 | * up privileges (see logfile_close() above). */ |
575 | logfile_reopen(); | |
9f639210 DD |
576 | ret = fn(fd, fd); |
577 | close_all(); | |
578 | _exit(ret); | |
c4a5c57d | 579 | } else if (pid < 0) { |
d62bcc17 WD |
580 | rsyserr(FERROR, errno, |
581 | "could not create child server process"); | |
c4a5c57d MP |
582 | close(fd); |
583 | /* This might have happened because we're | |
584 | * overloaded. Sleep briefly before trying to | |
585 | * accept again. */ | |
586 | sleep(2); | |
bd37c666 | 587 | } else { |
79845f28 | 588 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 589 | close(fd); |
f0fca04e | 590 | } |
f0fca04e | 591 | } |
f0fca04e AT |
592 | } |
593 | ||
594 | ||
595 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
596 | ||
597 | struct | |
598 | { | |
599 | char *name; | |
600 | int level; | |
601 | int option; | |
602 | int value; | |
603 | int opttype; | |
604 | } socket_options[] = { | |
605 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
606 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
607 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
608 | #ifdef TCP_NODELAY | |
609 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
610 | #endif | |
611 | #ifdef IPTOS_LOWDELAY | |
612 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
613 | #endif | |
614 | #ifdef IPTOS_THROUGHPUT | |
615 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
616 | #endif | |
617 | #ifdef SO_SNDBUF | |
618 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
619 | #endif | |
620 | #ifdef SO_RCVBUF | |
621 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
622 | #endif | |
623 | #ifdef SO_SNDLOWAT | |
624 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
625 | #endif | |
626 | #ifdef SO_RCVLOWAT | |
627 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
628 | #endif | |
629 | #ifdef SO_SNDTIMEO | |
630 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
631 | #endif | |
632 | #ifdef SO_RCVTIMEO | |
633 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
634 | #endif | |
635 | {NULL,0,0,0,0}}; | |
636 | ||
9c07d253 | 637 | |
f0fca04e | 638 | |
a7dc44d2 MP |
639 | /** |
640 | * Set user socket options | |
641 | **/ | |
f0fca04e AT |
642 | void set_socket_options(int fd, char *options) |
643 | { | |
644 | char *tok; | |
9c07d253 WD |
645 | |
646 | if (!options || !*options) | |
647 | return; | |
a6801c39 | 648 | |
f0fca04e | 649 | options = strdup(options); |
f0fca04e | 650 | |
9c07d253 WD |
651 | if (!options) |
652 | out_of_memory("set_socket_options"); | |
653 | ||
654 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
655 | int ret=0,i; |
656 | int value = 1; | |
657 | char *p; | |
658 | int got_value = 0; | |
659 | ||
660 | if ((p = strchr(tok,'='))) { | |
661 | *p = 0; | |
662 | value = atoi(p+1); | |
663 | got_value = 1; | |
664 | } | |
665 | ||
9c07d253 | 666 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
667 | if (strcmp(socket_options[i].name,tok)==0) |
668 | break; | |
9c07d253 | 669 | } |
f0fca04e AT |
670 | |
671 | if (!socket_options[i].name) { | |
672 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
673 | continue; | |
674 | } | |
675 | ||
676 | switch (socket_options[i].opttype) { | |
677 | case OPT_BOOL: | |
678 | case OPT_INT: | |
679 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
680 | socket_options[i].option, |
681 | (char *)&value, sizeof (int)); | |
f0fca04e | 682 | break; |
9c07d253 | 683 | |
f0fca04e AT |
684 | case OPT_ON: |
685 | if (got_value) | |
4ccfd96c | 686 | rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); |
f0fca04e AT |
687 | |
688 | { | |
689 | int on = socket_options[i].value; | |
690 | ret = setsockopt(fd,socket_options[i].level, | |
a3a84107 WD |
691 | socket_options[i].option, |
692 | (char *)&on, sizeof (int)); | |
f0fca04e | 693 | } |
9c07d253 | 694 | break; |
f0fca04e | 695 | } |
9c07d253 | 696 | |
d62bcc17 WD |
697 | if (ret != 0) { |
698 | rsyserr(FERROR, errno, | |
699 | "failed to set socket option %s", tok); | |
700 | } | |
f0fca04e AT |
701 | } |
702 | ||
703 | free(options); | |
704 | } | |
705 | ||
a7dc44d2 MP |
706 | /** |
707 | * Become a daemon, discarding the controlling terminal | |
708 | **/ | |
f0fca04e AT |
709 | void become_daemon(void) |
710 | { | |
b11ed3b1 AT |
711 | int i; |
712 | ||
c46ded46 | 713 | if (fork()) { |
f0fca04e | 714 | _exit(0); |
c46ded46 | 715 | } |
f0fca04e AT |
716 | |
717 | /* detach from the terminal */ | |
4f5b0756 | 718 | #ifdef HAVE_SETSID |
f0fca04e | 719 | setsid(); |
4f5b0756 | 720 | #elif defined TIOCNOTTY |
c46ded46 AT |
721 | i = open("/dev/tty", O_RDWR); |
722 | if (i >= 0) { | |
9c07d253 | 723 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 724 | close(i); |
f0fca04e | 725 | } |
f0fca04e | 726 | #endif |
b11ed3b1 | 727 | /* make sure that stdin, stdout an stderr don't stuff things |
a3a84107 | 728 | * up (library functions, for example) */ |
9c07d253 WD |
729 | for (i = 0; i < 3; i++) { |
730 | close(i); | |
b11ed3b1 AT |
731 | open("/dev/null", O_RDWR); |
732 | } | |
bc2e93eb | 733 | } |
ff8b29b8 | 734 | |
eecd22ff | 735 | |
a7dc44d2 MP |
736 | /** |
737 | * This is like socketpair but uses tcp. It is used by the Samba | |
738 | * regression test code. | |
9c07d253 | 739 | * |
a7dc44d2 MP |
740 | * The function guarantees that nobody else can attach to the socket, |
741 | * or if they do that this function fails and the socket gets closed | |
742 | * returns 0 on success, -1 on failure the resulting file descriptors | |
743 | * are symmetrical. | |
744 | **/ | |
eecd22ff MP |
745 | static int socketpair_tcp(int fd[2]) |
746 | { | |
747 | int listener; | |
748 | struct sockaddr_in sock; | |
749 | struct sockaddr_in sock2; | |
a3a84107 | 750 | socklen_t socklen = sizeof sock; |
eb8ffa90 | 751 | int connect_done = 0; |
9c07d253 | 752 | |
eecd22ff MP |
753 | fd[0] = fd[1] = listener = -1; |
754 | ||
a3a84107 | 755 | memset(&sock, 0, sizeof sock); |
9c07d253 WD |
756 | |
757 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
758 | goto failed; | |
eecd22ff | 759 | |
a3a84107 | 760 | memset(&sock2, 0, sizeof sock2); |
4f5b0756 | 761 | #ifdef HAVE_SOCKADDR_IN_LEN |
a3a84107 | 762 | sock2.sin_len = sizeof sock2; |
eecd22ff | 763 | #endif |
a3a84107 | 764 | sock2.sin_family = PF_INET; |
eecd22ff | 765 | |
a3a84107 | 766 | bind(listener, (struct sockaddr *)&sock2, sizeof sock2); |
eecd22ff | 767 | |
9c07d253 WD |
768 | if (listen(listener, 1) != 0) |
769 | goto failed; | |
eecd22ff | 770 | |
9c07d253 WD |
771 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
772 | goto failed; | |
eecd22ff | 773 | |
9c07d253 WD |
774 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
775 | goto failed; | |
eecd22ff MP |
776 | |
777 | set_nonblocking(fd[1]); | |
778 | ||
779 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
780 | ||
a3a84107 | 781 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { |
9c07d253 WD |
782 | if (errno != EINPROGRESS) |
783 | goto failed; | |
784 | } else | |
eecd22ff | 785 | connect_done = 1; |
eecd22ff | 786 | |
9c07d253 WD |
787 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
788 | goto failed; | |
eecd22ff MP |
789 | |
790 | close(listener); | |
ab217f7f WD |
791 | listener = -1; |
792 | ||
793 | set_blocking(fd[1]); | |
794 | ||
eecd22ff | 795 | if (connect_done == 0) { |
a3a84107 | 796 | if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 |
9c07d253 WD |
797 | && errno != EISCONN) |
798 | goto failed; | |
eecd22ff MP |
799 | } |
800 | ||
eecd22ff MP |
801 | /* all OK! */ |
802 | return 0; | |
803 | ||
804 | failed: | |
9c07d253 WD |
805 | if (fd[0] != -1) |
806 | close(fd[0]); | |
807 | if (fd[1] != -1) | |
808 | close(fd[1]); | |
809 | if (listener != -1) | |
810 | close(listener); | |
eecd22ff MP |
811 | return -1; |
812 | } | |
813 | ||
814 | ||
d02984bb MP |
815 | |
816 | /** | |
817 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
818 | * stdin and stdout. This is used to fake a connection to a daemon |
819 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
820 | * |
821 | * @return a socket which is attached to a subprocess running | |
822 | * "prog". stdin and stdout are attached. stderr is left attached to | |
823 | * the original stderr | |
824 | **/ | |
eecd22ff MP |
825 | int sock_exec(const char *prog) |
826 | { | |
827 | int fd[2]; | |
9c07d253 | 828 | |
eecd22ff | 829 | if (socketpair_tcp(fd) != 0) { |
d62bcc17 | 830 | rsyserr(FERROR, errno, "socketpair_tcp failed"); |
eecd22ff MP |
831 | return -1; |
832 | } | |
df5cd107 WD |
833 | if (verbose >= 2) |
834 | rprintf(FINFO, "Running socket program: \"%s\"\n", prog); | |
eecd22ff MP |
835 | if (fork() == 0) { |
836 | close(fd[0]); | |
837 | close(0); | |
838 | close(1); | |
839 | dup(fd[1]); | |
840 | dup(fd[1]); | |
9c07d253 | 841 | exit(system(prog)); |
eecd22ff | 842 | } |
9c07d253 | 843 | close(fd[1]); |
eecd22ff MP |
844 | return fd[0]; |
845 | } |