1 /* -*- c-file-style: "linux" -*-
3 Copyright (C) 1998-2000 by Andrew Tridgell
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 socket functions used in rsync
28 /* establish a proxy connection on an open socket to a web roxy by using the CONNECT
30 static int establish_proxy_connection(int fd, char *host, int port)
35 slprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
36 if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) {
37 rprintf(FERROR, "failed to write to proxy - %s\n",
42 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) {
43 if (read(fd, cp, 1) != 1) {
44 rprintf(FERROR, "failed to read from proxy\n");
56 if (strncmp(buffer, "HTTP/", 5) != 0) {
57 rprintf(FERROR, "bad response from proxy - %s\n",
61 for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++)
66 rprintf(FERROR, "bad response from proxy - %s\n",
70 /* throw away the rest of the HTTP header */
72 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1];
74 if (read(fd, cp, 1) != 1) {
75 rprintf(FERROR, "failed to read from proxy\n");
81 if ((cp > buffer) && (*cp == '\n'))
83 if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r')))
90 /* open a socket to a tcp remote host with the specified port
91 based on code from Warren
92 proxy support by Stephen Rothwell */
93 int open_socket_out(char *host, int port, struct in_addr *address)
95 int type = SOCK_STREAM;
96 struct sockaddr_in sock_out;
97 struct sockaddr_in sock;
106 /* if we have a RSYNC_PROXY env variable then redirect our connetcion via a web proxy
107 at the given address. The format is hostname:port */
108 h = getenv("RSYNC_PROXY");
109 proxied = (h != NULL) && (*h != '\0');
112 strlcpy(buffer, h, sizeof(buffer));
113 cp = strchr(buffer, ':');
115 rprintf(FERROR, "invalid proxy specification\n");
126 res = socket(PF_INET, type, 0);
131 hp = gethostbyname(h);
133 rprintf(FERROR,"unknown host: %s\n", h);
138 memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
139 sock_out.sin_port = htons(p);
140 sock_out.sin_family = PF_INET;
143 sock.sin_addr = *address;
145 sock.sin_family = hp->h_addrtype;
146 bind(res, (struct sockaddr * ) &sock,sizeof(sock));
149 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
150 rprintf(FERROR,"failed to connect to %s - %s\n", h, strerror(errno));
155 if (proxied && establish_proxy_connection(res, host, port) != 0) {
164 /****************************************************************************
165 open a socket of the specified type, port and address for incoming data
166 ****************************************************************************/
167 static int open_socket_in(int type, int port, struct in_addr *address)
170 struct sockaddr_in sock;
171 char host_name[MAXHOSTNAMELEN];
175 /* get my host name */
176 if (gethostname(host_name, sizeof(host_name)) == -1) {
177 rprintf(FERROR,"gethostname failed\n");
182 if ((hp = gethostbyname(host_name)) == 0) {
183 rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name);
187 memset((char *)&sock,0,sizeof(sock));
188 memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length);
189 sock.sin_port = htons(port);
190 sock.sin_family = hp->h_addrtype;
192 sock.sin_addr = *address;
194 sock.sin_addr.s_addr = INADDR_ANY;
196 res = socket(hp->h_addrtype, type, 0);
198 rprintf(FERROR,"socket failed\n");
202 setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
204 /* now we've got a socket - we need to bind it */
205 if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) {
206 rprintf(FERROR,"bind failed on port %d\n", port);
216 * Determine if a file descriptor is in fact a socket
218 int is_a_socket(int fd)
223 /* Parameters to getsockopt, setsockopt etc are very
224 * unstandardized across platforms, so don't be surprised if
225 * there are compiler warnings on e.g. SCO OpenSwerver. It
226 * seems they all eventually get the right idea.
228 * Debian says: ``The fifth argument of getsockopt and
229 * setsockopt is in reality an int [*] (and this is what BSD
230 * 4.* and libc4 and libc5 have). Some POSIX confusion
231 * resulted in the present socklen_t. The draft standard has
232 * not been adopted yet, but glibc2 already follows it and
233 * also has socklen_t [*]. See also accept(2).''
235 * We now return to your regularly scheduled programming. */
236 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
240 void start_accept_loop(int port, int (*fn)(int ))
243 extern struct in_addr socket_address;
245 /* open an incoming socket */
246 s = open_socket_in(SOCK_STREAM, port, &socket_address);
248 exit_cleanup(RERR_SOCKETIO);
250 /* ready to listen */
251 if (listen(s, 5) == -1) {
253 exit_cleanup(RERR_SOCKETIO);
257 /* now accept incoming connections - forking a new process
258 for each incoming connection */
262 struct sockaddr addr;
263 int in_addrlen = sizeof(addr);
265 /* close log file before the potentially very long select so
266 file can be trimmed by another process instead of growing
273 if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
277 if(!FD_ISSET(s, &fds)) continue;
279 /* See note above prototypes. */
280 fd = accept(s,&addr,&in_addrlen);
282 if (fd == -1) continue;
284 signal(SIGCHLD, SIG_IGN);
286 /* we shouldn't have any children left hanging around
287 but I have had reports that on Digital Unix zombies
288 are produced, so this ensures that they are reaped */
290 while (waitpid(-1, NULL, WNOHANG) > 0);
296 /* open log file in child before possibly giving
308 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
317 } socket_options[] = {
318 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
319 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
320 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
322 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
324 #ifdef IPTOS_LOWDELAY
325 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
327 #ifdef IPTOS_THROUGHPUT
328 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
331 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
334 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
337 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
340 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
343 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
346 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
352 /****************************************************************************
353 set user socket options
354 ****************************************************************************/
355 void set_socket_options(int fd, char *options)
358 if (!options || !*options) return;
360 options = strdup(options);
362 if (!options) out_of_memory("set_socket_options");
364 for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
370 if ((p = strchr(tok,'='))) {
376 for (i=0;socket_options[i].name;i++)
377 if (strcmp(socket_options[i].name,tok)==0)
380 if (!socket_options[i].name) {
381 rprintf(FERROR,"Unknown socket option %s\n",tok);
385 switch (socket_options[i].opttype) {
388 ret = setsockopt(fd,socket_options[i].level,
389 socket_options[i].option,(char *)&value,sizeof(int));
394 rprintf(FERROR,"syntax error - %s does not take a value\n",tok);
397 int on = socket_options[i].value;
398 ret = setsockopt(fd,socket_options[i].level,
399 socket_options[i].option,(char *)&on,sizeof(int));
405 rprintf(FERROR,"Failed to set socket option %s\n",tok);
411 /****************************************************************************
412 become a daemon, discarding the controlling terminal
413 ****************************************************************************/
414 void become_daemon(void)
422 /* detach from the terminal */
427 i = open("/dev/tty", O_RDWR);
429 ioctl(i, (int) TIOCNOTTY, (char *)0);
432 #endif /* TIOCNOTTY */
434 /* make sure that stdin, stdout an stderr don't stuff things
435 up (library functions, for example) */
438 open("/dev/null", O_RDWR);
442 /*******************************************************************
443 return the IP addr of the client as a string
444 ******************************************************************/
445 char *client_addr(int fd)
448 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
449 int length = sizeof(sa);
450 static char addr_buf[100];
451 static int initialised;
453 if (initialised) return addr_buf;
457 if (getpeername(fd, &sa, &length)) {
458 exit_cleanup(RERR_SOCKETIO);
461 strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
466 /*******************************************************************
467 return the DNS name of the client
468 ******************************************************************/
469 char *client_name(int fd)
472 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
473 int length = sizeof(sa);
474 static char name_buf[100];
477 char *def = "UNKNOWN";
478 static int initialised;
480 if (initialised) return name_buf;
484 strcpy(name_buf,def);
486 if (getpeername(fd, &sa, &length)) {
487 exit_cleanup(RERR_SOCKETIO);
490 /* Look up the remote host name. */
491 if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
492 sizeof(sockin->sin_addr),
494 strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
498 /* do a forward lookup as well to prevent spoofing */
499 hp = gethostbyname(name_buf);
501 strcpy(name_buf,def);
502 rprintf(FERROR,"reverse name lookup failed\n");
504 for (p=hp->h_addr_list;*p;p++) {
505 if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
510 strcpy(name_buf,def);
511 rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
518 /*******************************************************************
519 convert a string to an IP address. The string can be a name or
520 dotted decimal number
521 ******************************************************************/
522 struct in_addr *ip_address(const char *str)
524 static struct in_addr ret;
527 /* try as an IP address */
528 if (inet_aton(str, &ret) != 0) {
532 /* otherwise assume it's a network name of some sort and use
534 if ((hp = gethostbyname(str)) == 0) {
535 rprintf(FERROR, "gethostbyname: Unknown host. %s\n",str);
539 if (hp->h_addr == NULL) {
540 rprintf(FERROR, "gethostbyname: host address is invalid for host %s\n",str);
544 if (hp->h_length > sizeof(ret)) {
545 rprintf(FERROR, "gethostbyname: host address is too large\n");
549 memcpy(&ret.s_addr, hp->h_addr, hp->h_length);