2 Copyright (C) Andrew Tridgell 1998
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 socket functions used in rsync
27 /* establish a proxy connection on an open socket to a web roxy by using the CONNECT
29 static int establish_proxy_connection(int fd, char *host, int port)
34 slprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
35 if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) {
36 rprintf(FERROR, "failed to write to proxy - %s\n",
41 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) {
42 if (read(fd, cp, 1) != 1) {
43 rprintf(FERROR, "failed to read from proxy\n");
55 if (strncmp(buffer, "HTTP/", 5) != 0) {
56 rprintf(FERROR, "bad response from proxy - %s\n",
60 for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++)
65 rprintf(FERROR, "bad response from proxy - %s\n",
69 /* throw away the rest of the HTTP header */
71 for (cp = buffer; cp < &buffer[sizeof(buffer) - 1];
73 if (read(fd, cp, 1) != 1) {
74 rprintf(FERROR, "failed to read from proxy\n");
80 if ((cp > buffer) && (*cp == '\n'))
82 if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r')))
89 /* open a socket to a tcp remote host with the specified port
90 based on code from Warren
91 proxy support by Stephen Rothwell */
92 int open_socket_out(char *host, int port)
94 int type = SOCK_STREAM;
95 struct sockaddr_in sock_out;
104 /* if we have a RSYNC_PROXY env variable then redirect our connetcion via a web proxy
105 at the given address. The format is hostname:port */
106 h = getenv("RSYNC_PROXY");
107 proxied = (h != NULL) && (*h != '\0');
110 strlcpy(buffer, h, sizeof(buffer));
111 cp = strchr(buffer, ':');
113 rprintf(FERROR, "invalid proxy specification\n");
124 res = socket(PF_INET, type, 0);
129 hp = gethostbyname(h);
131 rprintf(FERROR,"unknown host: %s\n", h);
136 memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
137 sock_out.sin_port = htons(p);
138 sock_out.sin_family = PF_INET;
140 if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
141 rprintf(FERROR,"failed to connect to %s - %s\n", h, strerror(errno));
146 if (proxied && establish_proxy_connection(res, host, port) != 0) {
155 /****************************************************************************
156 open a socket of the specified type, port and address for incoming data
157 ****************************************************************************/
158 static int open_socket_in(int type, int port, struct in_addr *address)
161 struct sockaddr_in sock;
162 char host_name[MAXHOSTNAMELEN];
166 /* get my host name */
167 if (gethostname(host_name, sizeof(host_name)) == -1) {
168 rprintf(FERROR,"gethostname failed\n");
173 if ((hp = gethostbyname(host_name)) == 0) {
174 rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name);
178 memset((char *)&sock,0,sizeof(sock));
179 memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length);
180 sock.sin_port = htons(port);
181 sock.sin_family = hp->h_addrtype;
183 sock.sin_addr = *address;
185 sock.sin_addr.s_addr = INADDR_ANY;
187 res = socket(hp->h_addrtype, type, 0);
189 rprintf(FERROR,"socket failed\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\n", port);
206 /****************************************************************************
207 determine if a file descriptor is in fact a socket
208 ****************************************************************************/
209 int is_a_socket(int fd)
213 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
217 void start_accept_loop(int port, int (*fn)(int ))
220 extern struct in_addr socket_address;
222 /* open an incoming socket */
223 s = open_socket_in(SOCK_STREAM, port, &socket_address);
225 exit_cleanup(RERR_SOCKETIO);
227 /* ready to listen */
228 if (listen(s, 5) == -1) {
230 exit_cleanup(RERR_SOCKETIO);
234 /* now accept incoming connections - forking a new process
235 for each incoming connection */
239 struct sockaddr addr;
240 int in_addrlen = sizeof(addr);
245 if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
249 if(!FD_ISSET(s, &fds)) continue;
251 fd = accept(s,&addr,&in_addrlen);
253 if (fd == -1) continue;
255 signal(SIGCHLD, SIG_IGN);
257 /* we shouldn't have any children left hanging around
258 but I have had reports that on Digital Unix zombies
259 are produced, so this ensures that they are reaped */
261 while (waitpid(-1, NULL, WNOHANG) > 0);
275 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
284 } socket_options[] = {
285 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
286 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
287 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
289 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
291 #ifdef IPTOS_LOWDELAY
292 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
294 #ifdef IPTOS_THROUGHPUT
295 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
298 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
301 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
304 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
307 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
310 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
313 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
319 /****************************************************************************
320 set user socket options
321 ****************************************************************************/
322 void set_socket_options(int fd, char *options)
325 if (!options || !*options) return;
327 options = strdup(options);
329 if (!options) out_of_memory("set_socket_options");
331 for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
337 if ((p = strchr(tok,'='))) {
343 for (i=0;socket_options[i].name;i++)
344 if (strcmp(socket_options[i].name,tok)==0)
347 if (!socket_options[i].name) {
348 rprintf(FERROR,"Unknown socket option %s\n",tok);
352 switch (socket_options[i].opttype) {
355 ret = setsockopt(fd,socket_options[i].level,
356 socket_options[i].option,(char *)&value,sizeof(int));
361 rprintf(FERROR,"syntax error - %s does not take a value\n",tok);
364 int on = socket_options[i].value;
365 ret = setsockopt(fd,socket_options[i].level,
366 socket_options[i].option,(char *)&on,sizeof(int));
372 rprintf(FERROR,"Failed to set socket option %s\n",tok);
378 /****************************************************************************
379 become a daemon, discarding the controlling terminal
380 ****************************************************************************/
381 void become_daemon(void)
389 /* detach from the terminal */
394 i = open("/dev/tty", O_RDWR);
396 ioctl(i, (int) TIOCNOTTY, (char *)0);
399 #endif /* TIOCNOTTY */
401 /* make sure that stdin, stdout an stderr don't stuff things
402 up (library functions, for example) */
405 open("/dev/null", O_RDWR);
409 /*******************************************************************
410 return the IP addr of the client as a string
411 ******************************************************************/
412 char *client_addr(int fd)
415 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
416 int length = sizeof(sa);
417 static char addr_buf[100];
418 static int initialised;
420 if (initialised) return addr_buf;
424 if (getpeername(fd, &sa, &length)) {
425 exit_cleanup(RERR_SOCKETIO);
428 strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
433 /*******************************************************************
434 return the DNS name of the client
435 ******************************************************************/
436 char *client_name(int fd)
439 struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
440 int length = sizeof(sa);
441 static char name_buf[100];
444 char *def = "UNKNOWN";
445 static int initialised;
447 if (initialised) return name_buf;
451 strcpy(name_buf,def);
453 if (getpeername(fd, &sa, &length)) {
454 exit_cleanup(RERR_SOCKETIO);
457 /* Look up the remote host name. */
458 if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
459 sizeof(sockin->sin_addr),
461 strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
465 /* do a forward lookup as well to prevent spoofing */
466 hp = gethostbyname(name_buf);
468 strcpy(name_buf,def);
469 rprintf(FERROR,"reverse name lookup failed\n");
471 for (p=hp->h_addr_list;*p;p++) {
472 if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
477 strcpy(name_buf,def);
478 rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
485 /*******************************************************************
486 convert a string to an IP address. The string can be a name or
487 dotted decimal number
488 ******************************************************************/
489 struct in_addr *ip_address(const char *str)
491 static struct in_addr ret;
494 /* try as an IP address */
495 if (inet_aton(str, &ret) != 0) {
499 /* otherwise assume it's a network name of some sort and use
501 if ((hp = gethostbyname(str)) == 0) {
502 rprintf(FERROR, "gethostbyname: Unknown host. %s\n",str);
506 if (hp->h_addr == NULL) {
507 rprintf(FERROR, "gethostbyname: host address is invalid for host %s\n",str);
511 if (hp->h_length > sizeof(ret)) {
512 rprintf(FERROR, "gethostbyname: host address is too large\n");
516 memcpy(&ret.s_addr, hp->h_addr, hp->h_length);