1 /* -*- c-file-style: "linux" -*-
3 Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4 Copyright (C) 2001 by Martin Pool <mbp@samba.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 socket functions used in rsync
29 /* Establish a proxy connection on an open socket to a web roxy by
30 * using the CONNECT method. */
31 static int establish_proxy_connection(int fd, char *host, int port)
36 snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
37 if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) {
38 rprintf(FERROR, "failed to write to proxy: %s\n",
43 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) {
44 if (read(fd, cp, 1) != 1) {
45 rprintf(FERROR, "failed to read from proxy: %s\n",
58 if (strncmp(buffer, "HTTP/", 5) != 0) {
59 rprintf(FERROR, "bad response from proxy - %s\n",
63 for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++)
68 rprintf(FERROR, "bad response from proxy - %s\n",
72 /* throw away the rest of the HTTP header */
74 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1];
76 if (read(fd, cp, 1) != 1) {
77 rprintf(FERROR, "failed to read from proxy: %s\n",
84 if ((cp > buffer) && (*cp == '\n'))
86 if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r')))
93 /* open a socket to a tcp remote host with the specified port
94 based on code from Warren
95 proxy support by Stephen Rothwell */
96 int open_socket_out(char *host, int port, struct in_addr *address)
98 int type = SOCK_STREAM;
99 struct sockaddr_in sock_out;
100 struct sockaddr_in sock;
109 /* if we have a RSYNC_PROXY env variable then redirect our
110 * connetcion via a web proxy at the given address. The format
111 * is hostname:port */
112 h = getenv("RSYNC_PROXY");
113 proxied = (h != NULL) && (*h != '\0');
116 strlcpy(buffer, h, sizeof(buffer));
117 cp = strchr(buffer, ':');
120 "invalid proxy specification: should be HOST:PORT\n");
131 res = socket(PF_INET, type, 0);
136 hp = gethostbyname(h);
138 rprintf(FERROR,"unknown host: \"%s\"\n", h);
143 memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
144 sock_out.sin_port = htons(p);
145 sock_out.sin_family = PF_INET;
148 sock.sin_addr = *address;
150 sock.sin_family = hp->h_addrtype;
151 bind(res, (struct sockaddr * ) &sock,sizeof(sock));
154 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
155 rprintf(FERROR,"failed to connect to %s - %s\n", h, strerror(errno));
160 if (proxied && establish_proxy_connection(res, host, port) != 0) {
169 /****************************************************************************
170 open a socket of the specified type, port and address for incoming data
171 ****************************************************************************/
172 static int open_socket_in(int type, int port, struct in_addr *address)
174 struct sockaddr_in sock;
178 memset((char *)&sock,0,sizeof(sock));
179 sock.sin_port = htons(port);
180 sock.sin_family = AF_INET;
182 sock.sin_addr = *address;
184 sock.sin_addr.s_addr = INADDR_ANY;
186 res = socket(AF_INET, type, 0);
188 rprintf(FERROR,"socket failed: %s\n",
193 setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
195 /* now we've got a socket - we need to bind it */
196 if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) {
197 rprintf(FERROR,"bind failed on port %d: %s\n", port,
199 if (errno == EACCES && port < 1024) {
200 rprintf(FERROR, "Note: you must be root to bind "
201 "to low-numbered ports");
212 * Determine if a file descriptor is in fact a socket
214 int is_a_socket(int fd)
220 /* Parameters to getsockopt, setsockopt etc are very
221 * unstandardized across platforms, so don't be surprised if
222 * there are compiler warnings on e.g. SCO OpenSwerver or AIX.
223 * It seems they all eventually get the right idea.
225 * Debian says: ``The fifth argument of getsockopt and
226 * setsockopt is in reality an int [*] (and this is what BSD
227 * 4.* and libc4 and libc5 have). Some POSIX confusion
228 * resulted in the present socklen_t. The draft standard has
229 * not been adopted yet, but glibc2 already follows it and
230 * also has socklen_t [*]. See also accept(2).''
232 * We now return to your regularly scheduled programming. */
233 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
237 void start_accept_loop(int port, int (*fn)(int ))
240 extern struct in_addr socket_address;
242 /* open an incoming socket */
243 s = open_socket_in(SOCK_STREAM, port, &socket_address);
245 exit_cleanup(RERR_SOCKETIO);
247 /* ready to listen */
248 if (listen(s, 5) == -1) {
250 exit_cleanup(RERR_SOCKETIO);
254 /* now accept incoming connections - forking a new process
255 for each incoming connection */
259 struct sockaddr addr;
260 socklen_t in_addrlen = sizeof(addr);
262 /* close log file before the potentially very long select so
263 file can be trimmed by another process instead of growing
270 if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
274 if(!FD_ISSET(s, &fds)) continue;
276 /* See note above prototypes. */
277 fd = accept(s,&addr, &in_addrlen);
279 if (fd == -1) continue;
281 signal(SIGCHLD, SIG_IGN);
283 /* we shouldn't have any children left hanging around
284 but I have had reports that on Digital Unix zombies
285 are produced, so this ensures that they are reaped */
287 while (waitpid(-1, NULL, WNOHANG) > 0);
293 /* open log file in child before possibly giving
305 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
314 } socket_options[] = {
315 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
316 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
317 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
319 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
321 #ifdef IPTOS_LOWDELAY
322 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
324 #ifdef IPTOS_THROUGHPUT
325 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
328 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
331 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
334 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
337 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
340 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
343 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
349 /****************************************************************************
350 set user socket options
351 ****************************************************************************/
352 void set_socket_options(int fd, char *options)
355 if (!options || !*options) return;
357 options = strdup(options);
359 if (!options) out_of_memory("set_socket_options");
361 for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
367 if ((p = strchr(tok,'='))) {
373 for (i=0;socket_options[i].name;i++)
374 if (strcmp(socket_options[i].name,tok)==0)
377 if (!socket_options[i].name) {
378 rprintf(FERROR,"Unknown socket option %s\n",tok);
382 switch (socket_options[i].opttype) {
385 ret = setsockopt(fd,socket_options[i].level,
386 socket_options[i].option,(char *)&value,sizeof(int));
391 rprintf(FERROR,"syntax error - %s does not take a value\n",tok);
394 int on = socket_options[i].value;
395 ret = setsockopt(fd,socket_options[i].level,
396 socket_options[i].option,(char *)&on,sizeof(int));
402 rprintf(FERROR, "failed to set socket option %s: %s\n", tok,
409 /****************************************************************************
410 become a daemon, discarding the controlling terminal
411 ****************************************************************************/
412 void become_daemon(void)
420 /* detach from the terminal */
425 i = open("/dev/tty", O_RDWR);
427 ioctl(i, (int) TIOCNOTTY, (char *)0);
430 #endif /* TIOCNOTTY */
432 /* make sure that stdin, stdout an stderr don't stuff things
433 up (library functions, for example) */
436 open("/dev/null", O_RDWR);
440 /*******************************************************************
441 return the IP addr of the client as a string
442 ******************************************************************/
443 char *client_addr(int fd)
446 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
447 socklen_t length = sizeof(sa);
448 static char addr_buf[100];
449 static int initialised;
451 if (initialised) return addr_buf;
455 if (getpeername(fd, &sa, &length)) {
456 exit_cleanup(RERR_SOCKETIO);
459 strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
464 /*******************************************************************
465 return the DNS name of the client
466 ******************************************************************/
467 char *client_name(int fd)
470 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
471 socklen_t length = sizeof(sa);
472 static char name_buf[100];
475 char *def = "UNKNOWN";
476 static int initialised;
478 if (initialised) return name_buf;
482 strcpy(name_buf,def);
484 if (getpeername(fd, &sa, &length)) {
485 exit_cleanup(RERR_SOCKETIO);
488 /* Look up the remote host name. */
489 if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
490 sizeof(sockin->sin_addr),
492 strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
496 /* do a forward lookup as well to prevent spoofing */
497 hp = gethostbyname(name_buf);
499 strcpy (name_buf,def);
500 rprintf (FERROR, "reverse name lookup for \"%s\" failed\n",
503 for (p=hp->h_addr_list;*p;p++) {
504 if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
509 strcpy(name_buf,def);
510 rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
518 Convert a string to an IP address. The string can be a name or
519 dotted decimal number.
521 Returns a pointer to a static in_addr struct -- if you call this
522 more than once then you should copy it.
524 struct in_addr *ip_address(const char *str)
526 static struct in_addr ret;
530 rprintf (FERROR, "ip_address received NULL name\n");
534 /* try as an IP address */
535 if (inet_aton(str, &ret) != 0) {
539 /* otherwise assume it's a network name of some sort and use
541 if ((hp = gethostbyname (str)) == 0) {
542 rprintf(FERROR, "gethostbyname failed for \"%s\": unknown host?\n",str);
546 if (hp->h_addr == NULL) {
547 rprintf(FERROR, "gethostbyname: host address is invalid for host \"%s\"\n",str);
551 if (hp->h_length > sizeof ret) {
552 rprintf(FERROR, "gethostbyname: host address for \"%s\" is too large\n",
557 if (hp->h_addrtype != AF_INET) {
558 rprintf (FERROR, "gethostname: host address for \"%s\" is not IPv4\n",
563 /* This is kind of difficult. The only field in ret is
564 s_addr, which is the IP address as a 32-bit int. On
565 UNICOS, s_addr is in fact a *bitfield* for reasons best
566 know to Cray. This means we can't memcpy in to it. On the
567 other hand, h_addr is a char*, so we can't just assign.
569 Since there's meant to be only one field inside the in_addr
570 structure we will try just copying over the top and see how
572 memcpy (&ret, hp->h_addr, hp->h_length);