1 /* Establishing and handling network connections.
2 Copyright (C) 1995, 1996, 1997, 2001, 2002 Free Software Foundation, Inc.
4 This file is part of GNU Wget.
6 GNU Wget 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 GNU Wget 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 Wget; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 In addition, as a special exception, the Free Software Foundation
21 gives permission to link the code of its release of Wget with the
22 OpenSSL project's "OpenSSL" library (or with modified versions of it
23 that use the same license as the "OpenSSL" library), and distribute
24 the linked executables. You must obey the GNU General Public License
25 in all respects for all of the code used other than "OpenSSL". If you
26 modify this file, you may extend this exception to your version of the
27 file, but you are not obligated to do so. If you do not wish to do
28 so, delete this exception statement from your version. */
34 #include <sys/types.h>
43 # include <sys/socket.h>
45 # include <netinet/in.h>
47 # include <arpa/inet.h>
56 #endif /* HAVE_STRING_H */
57 #ifdef HAVE_SYS_SELECT_H
58 # include <sys/select.h>
59 #endif /* HAVE_SYS_SELECT_H */
70 /* Variables shared by bindport and acceptport: */
71 static int msock = -1;
72 static struct sockaddr *addr;
74 static ip_address bind_address;
75 static int bind_address_resolved;
78 resolve_bind_address (void)
80 struct address_list *al;
82 if (bind_address_resolved || opt.bind_address == NULL)
86 al = lookup_host (opt.bind_address, 1);
89 logprintf (LOG_NOTQUIET,
90 _("Unable to convert `%s' to a bind address. Reverting to ANY.\n"),
95 address_list_copy_one (al, 0, &bind_address);
96 address_list_release (al);
97 bind_address_resolved = 1;
102 const struct sockaddr *addr;
108 connect_with_timeout_callback (void *arg)
110 struct cwt_context *ctx = (struct cwt_context *)arg;
111 ctx->result = connect (ctx->fd, ctx->addr, ctx->addrlen);
114 /* Like connect, but specifies a timeout. If connecting takes longer
115 than TIMEOUT seconds, -1 is returned and errno is set to
119 connect_with_timeout (int fd, const struct sockaddr *addr, int addrlen,
122 struct cwt_context ctx;
125 ctx.addrlen = addrlen;
127 if (run_with_timeout (timeout, connect_with_timeout_callback, &ctx))
132 if (ctx.result == -1 && errno == EINTR)
137 /* A kludge, but still better than passing the host name all the way
138 to connect_to_one. */
139 static const char *connection_host_name;
142 set_connection_host_name (const char *host)
145 assert (connection_host_name == NULL);
147 assert (connection_host_name != NULL);
149 connection_host_name = host;
152 /* Connect to a remote host whose address has been resolved. */
154 connect_to_one (ip_address *addr, unsigned short port, int silent)
157 int sock, save_errno;
159 /* Set port and protocol */
160 wget_sockaddr_set_address (&sa, ip_default_family, port, addr);
164 char *pretty_addr = pretty_print_address (addr);
165 if (connection_host_name
166 && 0 != strcmp (connection_host_name, pretty_addr))
167 logprintf (LOG_VERBOSE, _("Connecting to %s[%s]:%hu... "),
168 connection_host_name, pretty_addr, port);
170 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "),
174 /* Make an internet socket, stream type. */
175 sock = socket (ip_default_family, SOCK_STREAM, 0);
180 /* For very small rate limits, set the buffer size (and hence,
181 hopefully, the size of the kernel window) to the size of the
183 if (opt.limit_rate && opt.limit_rate < 8192)
185 int bufsize = opt.limit_rate;
188 setsockopt (sock, SOL_SOCKET, SO_RCVBUF,
189 (char *)&bufsize, sizeof (bufsize));
193 resolve_bind_address ();
194 if (bind_address_resolved)
196 /* Bind the client side to the requested address. */
198 wget_sockaddr_set_address (&bsa, ip_default_family, 0, &bind_address);
199 if (bind (sock, &bsa.sa, sockaddr_len ()))
207 /* Connect the socket to the remote host. */
208 if (connect_with_timeout (sock, &sa.sa, sockaddr_len (), opt.timeout) < 0)
220 logprintf (LOG_VERBOSE, _("connected.\n"));
221 DEBUGP (("Created socket %d.\n", sock));
227 logprintf (LOG_VERBOSE, "failed: %s.\n", strerror (errno));
234 /* Connect to a remote host whose address has been resolved. */
236 connect_to_many (struct address_list *al, unsigned short port, int silent)
240 address_list_get_bounds (al, &start, &end);
241 for (i = start; i < end; i++)
245 address_list_copy_one (al, i, &addr);
247 sock = connect_to_one (&addr, port, silent);
252 address_list_set_faulty (al, i);
254 /* The attempt to connect has failed. Continue with the loop
255 and try next address. */
262 test_socket_open (int sock)
268 /* Check if we still have a valid (non-EOF) connection. From Andrew
269 * Maholski's code in the Unix Socket FAQ. */
271 FD_ZERO (&check_set);
272 FD_SET (sock, &check_set);
274 /* Wait one microsecond */
278 /* If we get a timeout, then that means still connected */
279 if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
281 /* Connection is valid (not EOF), so continue */
287 /* Without select, it's hard to know for sure. */
292 /* Bind the local port PORT. This does all the necessary work, which
293 is creating a socket, setting SO_REUSEADDR option on it, then
294 calling bind() and listen(). If *PORT is 0, a random port is
295 chosen by the system, and its value is stored to *PORT. The
296 internal variable MPORT is set to the value of the ensuing master
297 socket. Call acceptport() to block for and accept a connection. */
299 bindport (unsigned short *port, int family)
303 memset (&srv, 0, sizeof (wget_sockaddr));
307 if ((msock = socket (family, SOCK_STREAM, 0)) < 0)
311 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
312 (char *)&optval, sizeof (optval)) < 0)
316 resolve_bind_address ();
317 wget_sockaddr_set_address (&srv, ip_default_family, htons (*port),
318 bind_address_resolved ? &bind_address : NULL);
319 if (bind (msock, &srv.sa, sockaddr_len ()) < 0)
325 DEBUGP (("Master socket fd %d bound.\n", msock));
328 /* #### addrlen should be a 32-bit type, which int is not
329 guaranteed to be. Oh, and don't try to make it a size_t,
330 because that can be 64-bit. */
331 int sa_len = sockaddr_len ();
332 if (getsockname (msock, &srv.sa, &sa_len) < 0)
338 *port = wget_sockaddr_get_port (&srv);
339 DEBUGP (("using port %i.\n", *port));
341 if (listen (msock, 1) < 0)
351 /* Wait for file descriptor FD to be available, timing out after
352 MAXTIME seconds. "Available" means readable if writep is 0,
355 Returns 1 if FD is available, 0 for timeout and -1 for error. */
358 select_fd (int fd, double maxtime, int writep)
361 fd_set *rd = NULL, *wrt = NULL;
362 struct timeval tmout;
367 *(writep ? &wrt : &rd) = &fds;
369 tmout.tv_sec = (long)maxtime;
370 tmout.tv_usec = 1000000L * (maxtime - (long)maxtime);
373 result = select (fd + 1, rd, wrt, NULL, &tmout);
374 while (result < 0 && errno == EINTR);
376 /* When we've timed out, set errno to ETIMEDOUT for the convenience
383 #endif /* HAVE_SELECT */
385 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
386 that bindport() has been used to initialize MSOCK to a correct
387 value. It blocks the caller until a connection is established. If
388 no connection is established for OPT.TIMEOUT seconds, the function
389 exits with an error status. */
391 acceptport (int *sock)
393 int addrlen = sockaddr_len ();
396 if (select_fd (msock, opt.timeout, 0) <= 0)
399 if ((*sock = accept (msock, addr, &addrlen)) < 0)
401 DEBUGP (("Created socket fd %d.\n", *sock));
405 /* Close SOCK, as well as the most recently remembered MSOCK, created
406 via bindport(). If SOCK is -1, close MSOCK only. */
410 /*shutdown (sock, 2);*/
418 /* Return the local IP address associated with the connection on FD. */
421 conaddr (int fd, ip_address *ip)
425 /* see bindport() for discussion of using `int' here. */
426 int addrlen = sizeof (mysrv);
428 if (getsockname (fd, &mysrv.sa, (int *)&addrlen) < 0)
431 switch (mysrv.sa.sa_family)
435 memcpy (ip, &mysrv.sin6.sin6_addr, 16);
439 map_ipv4_to_ip ((ip4_address *)&mysrv.sin.sin_addr, ip);
447 /* Read at most LEN bytes from FD, storing them to BUF. This is
448 virtually the same as read(), but takes care of EINTR braindamage
449 and uses select() to timeout the stale connections (a connection is
450 stale if more than OPT.TIMEOUT time is spent in select() or
454 iread (int fd, char *buf, int len)
460 if (select_fd (fd, opt.timeout, 0) <= 0)
464 res = READ (fd, buf, len);
465 while (res == -1 && errno == EINTR);
470 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
471 unlike iread(), it makes sure that all of BUF is actually written
472 to FD, so callers needn't bother with checking that the return
473 value equals to LEN. Instead, you should simply check for -1. */
476 iwrite (int fd, char *buf, int len)
480 /* `write' may write less than LEN bytes, thus the outward loop
481 keeps trying it until all was written, or an error occurred. The
482 inner loop is reserved for the usual EINTR f*kage, and the
483 innermost loop deals with the same during select(). */
488 if (select_fd (fd, opt.timeout, 1) <= 0)
492 res = WRITE (fd, buf, len);
493 while (res == -1 && errno == EINTR);