1: /*
2: * Socket functions used in rsync.
3: *
4: * Copyright (C) 1992-2001 Andrew Tridgell <tridge@samba.org>
5: * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
6: * Copyright (C) 2003-2015 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 3 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: *
18: * You should have received a copy of the GNU General Public License along
19: * with this program; if not, visit the http://fsf.org website.
20: */
21:
22: /* This file is now converted to use the new-style getaddrinfo()
23: * interface, which supports IPv6 but is also supported on recent
24: * IPv4-only machines. On systems that don't have that interface, we
25: * emulate it using the KAME implementation. */
26:
27: #include "rsync.h"
28: #include "itypes.h"
29: #ifdef HAVE_NETINET_IN_SYSTM_H
30: #include <netinet/in_systm.h>
31: #endif
32: #ifdef HAVE_NETINET_IP_H
33: #include <netinet/ip.h>
34: #endif
35: #include <netinet/tcp.h>
36:
37: extern char *bind_address;
38: extern char *sockopts;
39: extern int default_af_hint;
40: extern int connect_timeout;
41:
42: #ifdef HAVE_SIGACTION
43: static struct sigaction sigact;
44: #endif
45:
46: static int sock_exec(const char *prog);
47:
48: /* Establish a proxy connection on an open socket to a web proxy by using the
49: * CONNECT method. If proxy_user and proxy_pass are not NULL, they are used to
50: * authenticate to the proxy using the "Basic" proxy-authorization protocol. */
51: static int establish_proxy_connection(int fd, char *host, int port,
52: char *proxy_user, char *proxy_pass)
53: {
54: char *cp, buffer[1024];
55: char *authhdr, authbuf[1024];
56: int len;
57:
58: if (proxy_user && proxy_pass) {
59: stringjoin(buffer, sizeof buffer,
60: proxy_user, ":", proxy_pass, NULL);
61: len = strlen(buffer);
62:
63: if ((len*8 + 5) / 6 >= (int)sizeof authbuf - 3) {
64: rprintf(FERROR,
65: "authentication information is too long\n");
66: return -1;
67: }
68:
69: base64_encode(buffer, len, authbuf, 1);
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) {
80: rsyserr(FERROR, errno, "failed to write to proxy");
81: return -1;
82: }
83:
84: for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) {
85: if (read(fd, cp, 1) != 1) {
86: rsyserr(FERROR, errno, "failed to read from proxy");
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) {
99: rprintf(FERROR, "bad response from proxy -- %s\n",
100: buffer);
101: return -1;
102: }
103: for (cp = &buffer[5]; isDigit(cp) || *cp == '.'; cp++) {}
104: while (*cp == ' ')
105: cp++;
106: if (*cp != '2') {
107: rprintf(FERROR, "bad response from proxy -- %s\n",
108: buffer);
109: return -1;
110: }
111: /* throw away the rest of the HTTP header */
112: while (1) {
113: for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) {
114: if (read(fd, cp, 1) != 1) {
115: rsyserr(FERROR, errno,
116: "failed to read from proxy");
117: return -1;
118: }
119: if (*cp == '\n')
120: break;
121: }
122: if (cp > buffer && *cp == '\n')
123: cp--;
124: if (cp == buffer && (*cp == '\n' || *cp == '\r'))
125: break;
126: }
127: return 0;
128: }
129:
130:
131: /* Try to set the local address for a newly-created socket.
132: * Return -1 if this fails. */
133: int try_bind_local(int s, int ai_family, int ai_socktype,
134: const char *bind_addr)
135: {
136: int error;
137: struct addrinfo bhints, *bres_all, *r;
138:
139: memset(&bhints, 0, sizeof bhints);
140: bhints.ai_family = ai_family;
141: bhints.ai_socktype = ai_socktype;
142: bhints.ai_flags = AI_PASSIVE;
143: if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) {
144: rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n",
145: bind_addr, gai_strerror(error));
146: return -1;
147: }
148:
149: for (r = bres_all; r; r = r->ai_next) {
150: if (bind(s, r->ai_addr, r->ai_addrlen) == -1)
151: continue;
152: freeaddrinfo(bres_all);
153: return s;
154: }
155:
156: /* no error message; there might be some problem that allows
157: * creation of the socket but not binding, perhaps if the
158: * machine has no ipv6 address of this name. */
159: freeaddrinfo(bres_all);
160: return -1;
161: }
162:
163: /* connect() timeout handler based on alarm() */
164: static void contimeout_handler(UNUSED(int val))
165: {
166: connect_timeout = -1;
167: }
168:
169: /* Open a socket to a tcp remote host with the specified port.
170: *
171: * Based on code from Warren. Proxy support by Stephen Rothwell.
172: * getaddrinfo() rewrite contributed by KAME.net.
173: *
174: * Now that we support IPv6 we need to look up the remote machine's address
175: * first, using af_hint to set a preference for the type of address. Then
176: * depending on whether it has v4 or v6 addresses we try to open a connection.
177: *
178: * The loop allows for machines with some addresses which may not be reachable,
179: * perhaps because we can't e.g. route ipv6 to that network but we can get ip4
180: * packets through.
181: *
182: * bind_addr: local address to use. Normally NULL to bind the wildcard address.
183: *
184: * af_hint: address family, e.g. AF_INET or AF_INET6. */
185: int open_socket_out(char *host, int port, const char *bind_addr,
186: int af_hint)
187: {
188: int type = SOCK_STREAM;
189: int error, s, j, addr_cnt, *errnos;
190: struct addrinfo hints, *res0, *res;
191: char portbuf[10];
192: char *h, *cp;
193: int proxied = 0;
194: char buffer[1024];
195: char *proxy_user = NULL, *proxy_pass = NULL;
196:
197: /* if we have a RSYNC_PROXY env variable then redirect our
198: * connetcion via a web proxy at the given address. */
199: h = getenv("RSYNC_PROXY");
200: proxied = h != NULL && *h != '\0';
201:
202: if (proxied) {
203: strlcpy(buffer, h, sizeof buffer);
204:
205: /* Is the USER:PASS@ prefix present? */
206: if ((cp = strrchr(buffer, '@')) != NULL) {
207: *cp++ = '\0';
208: /* The remainder is the HOST:PORT part. */
209: h = cp;
210:
211: if ((cp = strchr(buffer, ':')) == NULL) {
212: rprintf(FERROR,
213: "invalid proxy specification: should be USER:PASS@HOST:PORT\n");
214: return -1;
215: }
216: *cp++ = '\0';
217:
218: proxy_user = buffer;
219: proxy_pass = cp;
220: } else {
221: /* The whole buffer is the HOST:PORT part. */
222: h = buffer;
223: }
224:
225: if ((cp = strchr(h, ':')) == NULL) {
226: rprintf(FERROR,
227: "invalid proxy specification: should be HOST:PORT\n");
228: return -1;
229: }
230: *cp++ = '\0';
231: strlcpy(portbuf, cp, sizeof portbuf);
232: if (DEBUG_GTE(CONNECT, 1)) {
233: rprintf(FINFO, "connection via http proxy %s port %s\n",
234: h, portbuf);
235: }
236: } else {
237: snprintf(portbuf, sizeof portbuf, "%d", port);
238: h = host;
239: }
240:
241: memset(&hints, 0, sizeof hints);
242: hints.ai_family = af_hint;
243: hints.ai_socktype = type;
244: error = getaddrinfo(h, portbuf, &hints, &res0);
245: if (error) {
246: rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n",
247: h, portbuf, gai_strerror(error));
248: return -1;
249: }
250:
251: for (res = res0, addr_cnt = 0; res; res = res->ai_next, addr_cnt++) {}
252: errnos = new_array0(int, addr_cnt);
253: if (!errnos)
254: out_of_memory("open_socket_out");
255:
256: s = -1;
257: /* Try to connect to all addresses for this machine until we get
258: * through. It might e.g. be multi-homed, or have both IPv4 and IPv6
259: * addresses. We need to create a socket for each record, since the
260: * address record tells us what protocol to use to try to connect. */
261: for (res = res0, j = 0; res; res = res->ai_next, j++) {
262: s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
263: if (s < 0)
264: continue;
265:
266: if (bind_addr
267: && try_bind_local(s, res->ai_family, type,
268: bind_addr) == -1) {
269: close(s);
270: s = -1;
271: continue;
272: }
273: if (connect_timeout > 0) {
274: SIGACTION(SIGALRM, contimeout_handler);
275: alarm(connect_timeout);
276: }
277:
278: set_socket_options(s, sockopts);
279: while (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
280: if (connect_timeout < 0)
281: exit_cleanup(RERR_CONTIMEOUT);
282: if (errno == EINTR)
283: continue;
284: close(s);
285: s = -1;
286: break;
287: }
288:
289: if (connect_timeout > 0)
290: alarm(0);
291:
292: if (s < 0) {
293: errnos[j] = errno;
294: continue;
295: }
296:
297: if (proxied
298: && establish_proxy_connection(s, host, port,
299: proxy_user, proxy_pass) != 0) {
300: close(s);
301: s = -1;
302: continue;
303: }
304: if (DEBUG_GTE(CONNECT, 2)) {
305: char buf[2048];
306: if ((error = getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof buf, NULL, 0, NI_NUMERICHOST)) != 0)
307: snprintf(buf, sizeof buf, "*getnameinfo failure: %s*", gai_strerror(error));
308: rprintf(FINFO, "Connected to %s (%s)\n", h, buf);
309: }
310: break;
311: }
312:
313: if (s < 0 || DEBUG_GTE(CONNECT, 2)) {
314: char buf[2048];
315: for (res = res0, j = 0; res; res = res->ai_next, j++) {
316: if (errnos[j] == 0)
317: continue;
318: if ((error = getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof buf, NULL, 0, NI_NUMERICHOST)) != 0)
319: snprintf(buf, sizeof buf, "*getnameinfo failure: %s*", gai_strerror(error));
320: rsyserr(FERROR, errnos[j], "failed to connect to %s (%s)", h, buf);
321: }
322: if (s < 0)
323: s = -1;
324: }
325:
326: freeaddrinfo(res0);
327: free(errnos);
328:
329: return s;
330: }
331:
332:
333: /* Open an outgoing socket, but allow for it to be intercepted by
334: * $RSYNC_CONNECT_PROG, which will execute a program across a TCP
335: * socketpair rather than really opening a socket.
336: *
337: * We use this primarily in testing to detect TCP flow bugs, but not
338: * cause security problems by really opening remote connections.
339: *
340: * This is based on the Samba LIBSMB_PROG feature.
341: *
342: * bind_addr: local address to use. Normally NULL to get the stack default. */
343: int open_socket_out_wrapped(char *host, int port, const char *bind_addr,
344: int af_hint)
345: {
346: char *prog = getenv("RSYNC_CONNECT_PROG");
347:
348: if (prog && strchr(prog, '%')) {
349: int hlen = strlen(host);
350: int len = strlen(prog) + 1;
351: char *f, *t;
352: for (f = prog; *f; f++) {
353: if (*f != '%')
354: continue;
355: /* Compute more than enough room. */
356: if (f[1] == '%')
357: f++;
358: else
359: len += hlen;
360: }
361: f = prog;
362: if (!(prog = new_array(char, len)))
363: out_of_memory("open_socket_out_wrapped");
364: for (t = prog; *f; f++) {
365: if (*f == '%') {
366: switch (*++f) {
367: case '%':
368: /* Just skips the extra '%'. */
369: break;
370: case 'H':
371: memcpy(t, host, hlen);
372: t += hlen;
373: continue;
374: default:
375: f--; /* pass % through */
376: break;
377: }
378: }
379: *t++ = *f;
380: }
381: *t = '\0';
382: }
383:
384: if (DEBUG_GTE(CONNECT, 1)) {
385: rprintf(FINFO, "%sopening tcp connection to %s port %d\n",
386: prog ? "Using RSYNC_CONNECT_PROG instead of " : "",
387: host, port);
388: }
389: if (prog)
390: return sock_exec(prog);
391: return open_socket_out(host, port, bind_addr, af_hint);
392: }
393:
394:
395: /* Open one or more sockets for incoming data using the specified type,
396: * port, and address.
397: *
398: * The getaddrinfo() call may return several address results, e.g. for
399: * the machine's IPv4 and IPv6 name.
400: *
401: * We return an array of file-descriptors to the sockets, with a trailing
402: * -1 value to indicate the end of the list.
403: *
404: * bind_addr: local address to bind, or NULL to allow it to default. */
405: static int *open_socket_in(int type, int port, const char *bind_addr,
406: int af_hint)
407: {
408: int one = 1;
409: int s, *socks, maxs, i, ecnt;
410: struct addrinfo hints, *all_ai, *resp;
411: char portbuf[10], **errmsgs;
412: int error;
413:
414: memset(&hints, 0, sizeof hints);
415: hints.ai_family = af_hint;
416: hints.ai_socktype = type;
417: hints.ai_flags = AI_PASSIVE;
418: snprintf(portbuf, sizeof portbuf, "%d", port);
419: error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai);
420: if (error) {
421: rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n",
422: bind_addr, gai_strerror(error));
423: return NULL;
424: }
425:
426: /* Count max number of sockets we might open. */
427: for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {}
428:
429: socks = new_array(int, maxs + 1);
430: errmsgs = new_array(char *, maxs);
431: if (!socks || !errmsgs)
432: out_of_memory("open_socket_in");
433:
434: /* We may not be able to create the socket, if for example the
435: * machine knows about IPv6 in the C library, but not in the
436: * kernel. */
437: for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) {
438: s = socket(resp->ai_family, resp->ai_socktype,
439: resp->ai_protocol);
440:
441: if (s == -1) {
442: int r = asprintf(&errmsgs[ecnt++],
443: "socket(%d,%d,%d) failed: %s\n",
444: (int)resp->ai_family, (int)resp->ai_socktype,
445: (int)resp->ai_protocol, strerror(errno));
446: if (r < 0)
447: out_of_memory("open_socket_in");
448: /* See if there's another address that will work... */
449: continue;
450: }
451:
452: setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
453: (char *)&one, sizeof one);
454: if (sockopts)
455: set_socket_options(s, sockopts);
456: else
457: set_socket_options(s, lp_socket_options());
458:
459: #ifdef IPV6_V6ONLY
460: if (resp->ai_family == AF_INET6) {
461: if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
462: (char *)&one, sizeof one) < 0
463: && default_af_hint != AF_INET6) {
464: close(s);
465: continue;
466: }
467: }
468: #endif
469:
470: /* Now we've got a socket - we need to bind it. */
471: if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) {
472: /* Nope, try another */
473: int r = asprintf(&errmsgs[ecnt++],
474: "bind() failed: %s (address-family %d)\n",
475: strerror(errno), (int)resp->ai_family);
476: if (r < 0)
477: out_of_memory("open_socket_in");
478: close(s);
479: continue;
480: }
481:
482: socks[i++] = s;
483: }
484: socks[i] = -1;
485:
486: if (all_ai)
487: freeaddrinfo(all_ai);
488:
489: /* Only output the socket()/bind() messages if we were totally
490: * unsuccessful, or if the daemon is being run with -vv. */
491: for (s = 0; s < ecnt; s++) {
492: if (!i || DEBUG_GTE(BIND, 1))
493: rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]), 0);
494: free(errmsgs[s]);
495: }
496: free(errmsgs);
497:
498: if (!i) {
499: rprintf(FERROR,
500: "unable to bind any inbound sockets on port %d\n",
501: port);
502: free(socks);
503: return NULL;
504: }
505: return socks;
506: }
507:
508:
509: /* Determine if a file descriptor is in fact a socket. */
510: int is_a_socket(int fd)
511: {
512: int v;
513: socklen_t l = sizeof (int);
514:
515: /* Parameters to getsockopt, setsockopt etc are very
516: * unstandardized across platforms, so don't be surprised if
517: * there are compiler warnings on e.g. SCO OpenSwerver or AIX.
518: * It seems they all eventually get the right idea.
519: *
520: * Debian says: ``The fifth argument of getsockopt and
521: * setsockopt is in reality an int [*] (and this is what BSD
522: * 4.* and libc4 and libc5 have). Some POSIX confusion
523: * resulted in the present socklen_t. The draft standard has
524: * not been adopted yet, but glibc2 already follows it and
525: * also has socklen_t [*]. See also accept(2).''
526: *
527: * We now return to your regularly scheduled programming. */
528: return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0;
529: }
530:
531:
532: static void sigchld_handler(UNUSED(int val))
533: {
534: #ifdef WNOHANG
535: while (waitpid(-1, NULL, WNOHANG) > 0) {}
536: #endif
537: #ifndef HAVE_SIGACTION
538: signal(SIGCHLD, sigchld_handler);
539: #endif
540: }
541:
542:
543: void start_accept_loop(int port, int (*fn)(int, int))
544: {
545: fd_set deffds;
546: int *sp, maxfd, i;
547:
548: #ifdef HAVE_SIGACTION
549: sigact.sa_flags = SA_NOCLDSTOP;
550: #endif
551:
552: /* open an incoming socket */
553: sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint);
554: if (sp == NULL)
555: exit_cleanup(RERR_SOCKETIO);
556:
557: /* ready to listen */
558: FD_ZERO(&deffds);
559: for (i = 0, maxfd = -1; sp[i] >= 0; i++) {
560: if (listen(sp[i], lp_listen_backlog()) < 0) {
561: rsyserr(FERROR, errno, "listen() on socket failed");
562: #ifdef INET6
563: if (errno == EADDRINUSE && i > 0) {
564: rprintf(FINFO,
565: "Try using --ipv4 or --ipv6 to avoid this listen() error.\n");
566: }
567: #endif
568: exit_cleanup(RERR_SOCKETIO);
569: }
570: FD_SET(sp[i], &deffds);
571: if (maxfd < sp[i])
572: maxfd = sp[i];
573: }
574:
575: /* now accept incoming connections - forking a new process
576: * for each incoming connection */
577: while (1) {
578: fd_set fds;
579: pid_t pid;
580: int fd;
581: struct sockaddr_storage addr;
582: socklen_t addrlen = sizeof addr;
583:
584: /* close log file before the potentially very long select so
585: * file can be trimmed by another process instead of growing
586: * forever */
587: logfile_close();
588:
589: #ifdef FD_COPY
590: FD_COPY(&deffds, &fds);
591: #else
592: fds = deffds;
593: #endif
594:
595: if (select(maxfd + 1, &fds, NULL, NULL, NULL) < 1)
596: continue;
597:
598: for (i = 0, fd = -1; sp[i] >= 0; i++) {
599: if (FD_ISSET(sp[i], &fds)) {
600: fd = accept(sp[i], (struct sockaddr *)&addr,
601: &addrlen);
602: break;
603: }
604: }
605:
606: if (fd < 0)
607: continue;
608:
609: SIGACTION(SIGCHLD, sigchld_handler);
610:
611: if ((pid = fork()) == 0) {
612: int ret;
613: for (i = 0; sp[i] >= 0; i++)
614: close(sp[i]);
615: /* Re-open log file in child before possibly giving
616: * up privileges (see logfile_close() above). */
617: logfile_reopen();
618: ret = fn(fd, fd);
619: close_all();
620: _exit(ret);
621: } else if (pid < 0) {
622: rsyserr(FERROR, errno,
623: "could not create child server process");
624: close(fd);
625: /* This might have happened because we're
626: * overloaded. Sleep briefly before trying to
627: * accept again. */
628: sleep(2);
629: } else {
630: /* Parent doesn't need this fd anymore. */
631: close(fd);
632: }
633: }
634: }
635:
636:
637: enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
638:
639: struct
640: {
641: char *name;
642: int level;
643: int option;
644: int value;
645: int opttype;
646: } socket_options[] = {
647: {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
648: {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
649: #ifdef SO_BROADCAST
650: {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
651: #endif
652: #ifdef TCP_NODELAY
653: {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
654: #endif
655: #ifdef IPTOS_LOWDELAY
656: {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
657: #endif
658: #ifdef IPTOS_THROUGHPUT
659: {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
660: #endif
661: #ifdef SO_SNDBUF
662: {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
663: #endif
664: #ifdef SO_RCVBUF
665: {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
666: #endif
667: #ifdef SO_SNDLOWAT
668: {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
669: #endif
670: #ifdef SO_RCVLOWAT
671: {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
672: #endif
673: #ifdef SO_SNDTIMEO
674: {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
675: #endif
676: #ifdef SO_RCVTIMEO
677: {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
678: #endif
679: {NULL,0,0,0,0}
680: };
681:
682:
683: /* Set user socket options. */
684: void set_socket_options(int fd, char *options)
685: {
686: char *tok;
687:
688: if (!options || !*options)
689: return;
690:
691: options = strdup(options);
692:
693: if (!options)
694: out_of_memory("set_socket_options");
695:
696: for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) {
697: int ret=0,i;
698: int value = 1;
699: char *p;
700: int got_value = 0;
701:
702: if ((p = strchr(tok,'='))) {
703: *p = 0;
704: value = atoi(p+1);
705: got_value = 1;
706: }
707:
708: for (i = 0; socket_options[i].name; i++) {
709: if (strcmp(socket_options[i].name,tok)==0)
710: break;
711: }
712:
713: if (!socket_options[i].name) {
714: rprintf(FERROR,"Unknown socket option %s\n",tok);
715: continue;
716: }
717:
718: switch (socket_options[i].opttype) {
719: case OPT_BOOL:
720: case OPT_INT:
721: ret = setsockopt(fd,socket_options[i].level,
722: socket_options[i].option,
723: (char *)&value, sizeof (int));
724: break;
725:
726: case OPT_ON:
727: if (got_value)
728: rprintf(FERROR,"syntax error -- %s does not take a value\n",tok);
729:
730: {
731: int on = socket_options[i].value;
732: ret = setsockopt(fd,socket_options[i].level,
733: socket_options[i].option,
734: (char *)&on, sizeof (int));
735: }
736: break;
737: }
738:
739: if (ret != 0) {
740: rsyserr(FERROR, errno,
741: "failed to set socket option %s", tok);
742: }
743: }
744:
745: free(options);
746: }
747:
748:
749: /* This is like socketpair but uses tcp. The function guarantees that nobody
750: * else can attach to the socket, or if they do that this function fails and
751: * the socket gets closed. Returns 0 on success, -1 on failure. The resulting
752: * file descriptors are symmetrical. Currently only for RSYNC_CONNECT_PROG. */
753: static int socketpair_tcp(int fd[2])
754: {
755: int listener;
756: struct sockaddr_in sock;
757: struct sockaddr_in sock2;
758: socklen_t socklen = sizeof sock;
759: int connect_done = 0;
760:
761: fd[0] = fd[1] = listener = -1;
762:
763: memset(&sock, 0, sizeof sock);
764:
765: if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1)
766: goto failed;
767:
768: memset(&sock2, 0, sizeof sock2);
769: #ifdef HAVE_SOCKADDR_IN_LEN
770: sock2.sin_len = sizeof sock2;
771: #endif
772: sock2.sin_family = PF_INET;
773: sock2.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
774:
775: if (bind(listener, (struct sockaddr *)&sock2, sizeof sock2) != 0
776: || listen(listener, 1) != 0
777: || getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0
778: || (fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1)
779: goto failed;
780:
781: set_nonblocking(fd[1]);
782:
783: sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
784:
785: if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) {
786: if (errno != EINPROGRESS)
787: goto failed;
788: } else
789: connect_done = 1;
790:
791: if ((fd[0] = accept(listener, (struct sockaddr *)&sock2, &socklen)) == -1)
792: goto failed;
793:
794: close(listener);
795: listener = -1;
796:
797: set_blocking(fd[1]);
798:
799: if (connect_done == 0) {
800: if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0
801: && errno != EISCONN)
802: goto failed;
803: }
804:
805: /* all OK! */
806: return 0;
807:
808: failed:
809: if (fd[0] != -1)
810: close(fd[0]);
811: if (fd[1] != -1)
812: close(fd[1]);
813: if (listener != -1)
814: close(listener);
815: return -1;
816: }
817:
818:
819: /* Run a program on a local tcp socket, so that we can talk to it's stdin and
820: * stdout. This is used to fake a connection to a daemon for testing -- not
821: * for the normal case of running SSH.
822: *
823: * Retruns a socket which is attached to a subprocess running "prog". stdin and
824: * stdout are attached. stderr is left attached to the original stderr. */
825: static int sock_exec(const char *prog)
826: {
827: pid_t pid;
828: int fd[2];
829:
830: if (socketpair_tcp(fd) != 0) {
831: rsyserr(FERROR, errno, "socketpair_tcp failed");
832: return -1;
833: }
834: if (DEBUG_GTE(CMD, 1))
835: rprintf(FINFO, "Running socket program: \"%s\"\n", prog);
836:
837: pid = fork();
838: if (pid < 0) {
839: rsyserr(FERROR, errno, "fork");
840: exit_cleanup(RERR_IPC);
841: }
842:
843: if (pid == 0) {
844: close(fd[0]);
845: if (dup2(fd[1], STDIN_FILENO) < 0
846: || dup2(fd[1], STDOUT_FILENO) < 0) {
847: fprintf(stderr, "Failed to run \"%s\"\n", prog);
848: exit(1);
849: }
850: exit(system(prog));
851: }
852:
853: close(fd[1]);
854: return fd[0];
855: }
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