1 /* Establishing and handling network connections.
2 Copyright (C) 1995, 1996, 1997 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. */
23 #include <sys/types.h>
32 # include <sys/socket.h>
34 # include <netinet/in.h>
36 # include <arpa/inet.h>
45 #endif /* HAVE_STRING_H */
46 #ifdef HAVE_SYS_SELECT_H
47 # include <sys/select.h>
48 #endif /* HAVE_SYS_SELECT_H */
58 /* Variables shared by bindport and acceptport: */
59 static int msock = -1;
60 static struct sockaddr *addr;
62 /* A kludge, but still better than passing the host name all the way
64 static const char *connection_host_name;
67 set_connection_host_name (const char *host)
70 assert (connection_host_name == NULL);
72 assert (connection_host_name != NULL);
74 connection_host_name = host;
77 /* Connect to a remote host whose address has been resolved. */
79 connect_to_one (ip_address *addr, unsigned short port, int silent)
84 /* Set port and protocol */
85 wget_sockaddr_set_address (&sa, ip_default_family, port, addr);
89 char *pretty_addr = pretty_print_address (addr);
90 if (connection_host_name
91 && 0 != strcmp (connection_host_name, pretty_addr))
92 logprintf (LOG_VERBOSE, _("Connecting to %s[%s]:%hu... "),
93 connection_host_name, pretty_addr, port);
95 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "),
99 /* Make an internet socket, stream type. */
100 sock = socket (ip_default_family, SOCK_STREAM, 0);
104 if (opt.bind_address)
106 /* Bind the client side to the requested address. */
107 if (bind (sock, (struct sockaddr *)opt.bind_address, sockaddr_len ()))
115 /* Connect the socket to the remote host. */
116 if (connect (sock, &sa.sa, sockaddr_len ()) < 0)
128 logprintf (LOG_VERBOSE, _("connected.\n"));
129 DEBUGP (("Created socket %d.\n", sock));
135 logprintf (LOG_VERBOSE, "failed: %s.\n", strerror (errno));
142 /* Connect to a remote host whose address has been resolved. */
144 connect_to_many (struct address_list *al, unsigned short port, int silent)
148 address_list_get_bounds (al, &start, &end);
149 for (i = start; i < end; i++)
153 address_list_copy_one (al, i, &addr);
155 sock = connect_to_one (&addr, port, silent);
160 address_list_set_faulty (al, i);
162 /* The attempt to connect has failed. Continue with the loop
163 and try next address. */
170 test_socket_open (int sock)
176 /* Check if we still have a valid (non-EOF) connection. From Andrew
177 * Maholski's code in the Unix Socket FAQ. */
179 FD_ZERO (&check_set);
180 FD_SET (sock, &check_set);
182 /* Wait one microsecond */
186 /* If we get a timeout, then that means still connected */
187 if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
189 /* Connection is valid (not EOF), so continue */
195 /* Without select, it's hard to know for sure. */
200 /* Bind the local port PORT. This does all the necessary work, which
201 is creating a socket, setting SO_REUSEADDR option on it, then
202 calling bind() and listen(). If *PORT is 0, a random port is
203 chosen by the system, and its value is stored to *PORT. The
204 internal variable MPORT is set to the value of the ensuing master
205 socket. Call acceptport() to block for and accept a connection. */
207 bindport (unsigned short *port, int family)
211 memset (&srv, 0, sizeof (wget_sockaddr));
215 if ((msock = socket (family, SOCK_STREAM, 0)) < 0)
217 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
218 (char *)&optval, sizeof (optval)) < 0)
221 if (opt.bind_address == NULL)
222 wget_sockaddr_set_address (&srv, ip_default_family, htons (*port), NULL);
224 srv = *opt.bind_address;
225 wget_sockaddr_set_port (&srv, *port);
226 if (bind (msock, &srv.sa, sockaddr_len ()) < 0)
232 DEBUGP (("Master socket fd %d bound.\n", msock));
235 /* #### addrlen should be a 32-bit type, which int is not
236 guaranteed to be. Oh, and don't try to make it a size_t,
237 because that can be 64-bit. */
238 int sa_len = sockaddr_len ();
239 if (getsockname (msock, &srv.sa, &sa_len) < 0)
245 *port = wget_sockaddr_get_port (&srv);
246 DEBUGP (("using port %i.\n", *port));
248 if (listen (msock, 1) < 0)
258 /* Wait for file descriptor FD to be readable, MAXTIME being the
259 timeout in seconds. If WRITEP is non-zero, checks for FD being
262 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
265 select_fd (int fd, int maxtime, int writep)
267 fd_set fds, exceptfds;
268 struct timeval timeout;
272 FD_ZERO (&exceptfds);
273 FD_SET (fd, &exceptfds);
274 timeout.tv_sec = maxtime;
276 /* HPUX reportedly warns here. What is the correct incantation? */
277 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
278 &exceptfds, &timeout);
280 #endif /* HAVE_SELECT */
282 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
283 that bindport() has been used to initialize MSOCK to a correct
284 value. It blocks the caller until a connection is established. If
285 no connection is established for OPT.TIMEOUT seconds, the function
286 exits with an error status. */
288 acceptport (int *sock)
290 int addrlen = sockaddr_len ();
293 if (select_fd (msock, opt.timeout, 0) <= 0)
296 if ((*sock = accept (msock, addr, &addrlen)) < 0)
298 DEBUGP (("Created socket fd %d.\n", *sock));
302 /* Close SOCK, as well as the most recently remembered MSOCK, created
303 via bindport(). If SOCK is -1, close MSOCK only. */
307 /*shutdown (sock, 2);*/
315 /* Return the local IP address associated with the connection on FD. */
318 conaddr (int fd, ip_address *ip)
322 /* see bindport() for discussion of using `int' here. */
323 int addrlen = sizeof (mysrv);
325 if (getsockname (fd, &mysrv.sa, (int *)&addrlen) < 0)
328 switch (mysrv.sa.sa_family)
332 memcpy (ip, &mysrv.sin6.sin6_addr, 16);
336 map_ipv4_to_ip ((ip4_address *)&mysrv.sin.sin_addr, ip);
344 /* Read at most LEN bytes from FD, storing them to BUF. This is
345 virtually the same as read(), but takes care of EINTR braindamage
346 and uses select() to timeout the stale connections (a connection is
347 stale if more than OPT.TIMEOUT time is spent in select() or
350 iread (int fd, char *buf, int len)
361 res = select_fd (fd, opt.timeout, 0);
363 while (res == -1 && errno == EINTR);
366 /* Set errno to ETIMEDOUT on timeout. */
368 /* #### Potentially evil! */
374 res = READ (fd, buf, len);
376 while (res == -1 && errno == EINTR);
381 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
382 doesn't bother with select(). Unlike iread(), it makes sure that
383 all of BUF is actually written to FD, so callers needn't bother
384 with checking that the return value equals to LEN. Instead, you
385 should simply check for -1. */
387 iwrite (int fd, char *buf, int len)
391 /* `write' may write less than LEN bytes, thus the outward loop
392 keeps trying it until all was written, or an error occurred. The
393 inner loop is reserved for the usual EINTR f*kage, and the
394 innermost loop deals with the same during select(). */
404 res = select_fd (fd, opt.timeout, 1);
406 while (res == -1 && errno == EINTR);
409 /* Set errno to ETIMEDOUT on timeout. */
411 /* #### Potentially evil! */
417 res = WRITE (fd, buf, len);
419 while (res == -1 && errno == EINTR);