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 (unsigned char *addr, unsigned short port, int silent)
81 struct sockaddr_in sock_name;
84 /* Set port and protocol */
85 sock_name.sin_family = AF_INET;
86 sock_name.sin_port = htons (port);
87 memcpy ((unsigned char *)&sock_name.sin_addr, addr, 4);
91 char *pretty_addr = pretty_print_address (addr);
92 if (connection_host_name
93 && 0 != strcmp (connection_host_name, pretty_addr))
94 logprintf (LOG_VERBOSE, _("Connecting to %s[%s]:%hu... "),
95 connection_host_name, pretty_addr, port);
97 logprintf (LOG_VERBOSE, _("Connecting to %s:%hu... "),
101 /* Make an internet socket, stream type. */
102 sock = socket (AF_INET, SOCK_STREAM, 0);
106 if (opt.bind_address)
108 /* Bind the client side to the requested address. */
109 if (bind (sock, (struct sockaddr *)opt.bind_address,
110 sizeof (*opt.bind_address)))
118 /* Connect the socket to the remote host. */
119 if (connect (sock, (struct sockaddr *)&sock_name, sizeof (sock_name)) < 0)
131 logprintf (LOG_VERBOSE, _("connected.\n"));
132 DEBUGP (("Created socket %d.\n", sock));
138 logprintf (LOG_VERBOSE, "failed: %s.\n", strerror (errno));
145 /* Connect to a remote host whose address has been resolved. */
147 connect_to_many (struct address_list *al, unsigned short port, int silent)
151 for (i = 0; i < address_list_count (al); i++)
153 unsigned char addr[4];
155 address_list_copy_one (al, i, addr);
157 sock = connect_to_one (addr, port, silent);
161 /* Perhaps we should have a way of removing the failing entry
162 from the address list? */
164 /* The attempt to connect has failed. Continue with the loop
165 and try next address. */
172 test_socket_open (int sock)
178 /* Check if we still have a valid (non-EOF) connection. From Andrew
179 * Maholski's code in the Unix Socket FAQ. */
181 FD_ZERO (&check_set);
182 FD_SET (sock, &check_set);
184 /* Wait one microsecond */
188 /* If we get a timeout, then that means still connected */
189 if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
191 /* Connection is valid (not EOF), so continue */
197 /* Without select, it's hard to know for sure. */
202 /* Bind the local port PORT. This does all the necessary work, which
203 is creating a socket, setting SO_REUSEADDR option on it, then
204 calling bind() and listen(). If *PORT is 0, a random port is
205 chosen by the system, and its value is stored to *PORT. The
206 internal variable MPORT is set to the value of the ensuing master
207 socket. Call acceptport() to block for and accept a connection. */
209 bindport (unsigned short *port)
212 static struct sockaddr_in srv;
215 addr = (struct sockaddr *) &srv;
216 if ((msock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
218 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
219 (char *)&optval, sizeof (optval)) < 0)
222 if (opt.bind_address == NULL)
224 srv.sin_family = AF_INET;
225 srv.sin_addr.s_addr = htonl (INADDR_ANY);
228 srv = *opt.bind_address;
230 srv.sin_port = htons (*port);
231 if (bind (msock, addr, sizeof (struct sockaddr_in)) < 0)
237 DEBUGP (("Master socket fd %d bound.\n", msock));
240 /* #### addrlen should be a 32-bit type, which int is not
241 guaranteed to be. Oh, and don't try to make it a size_t,
242 because that can be 64-bit. */
243 int addrlen = sizeof (struct sockaddr_in);
244 if (getsockname (msock, addr, &addrlen) < 0)
250 *port = ntohs (srv.sin_port);
252 if (listen (msock, 1) < 0)
262 /* Wait for file descriptor FD to be readable, MAXTIME being the
263 timeout in seconds. If WRITEP is non-zero, checks for FD being
266 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
269 select_fd (int fd, int maxtime, int writep)
271 fd_set fds, exceptfds;
272 struct timeval timeout;
276 FD_ZERO (&exceptfds);
277 FD_SET (fd, &exceptfds);
278 timeout.tv_sec = maxtime;
280 /* HPUX reportedly warns here. What is the correct incantation? */
281 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
282 &exceptfds, &timeout);
284 #endif /* HAVE_SELECT */
286 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
287 that bindport() has been used to initialize MSOCK to a correct
288 value. It blocks the caller until a connection is established. If
289 no connection is established for OPT.TIMEOUT seconds, the function
290 exits with an error status. */
292 acceptport (int *sock)
294 int addrlen = sizeof (struct sockaddr_in);
297 if (select_fd (msock, opt.timeout, 0) <= 0)
300 if ((*sock = accept (msock, addr, &addrlen)) < 0)
302 DEBUGP (("Created socket fd %d.\n", *sock));
306 /* Close SOCK, as well as the most recently remembered MSOCK, created
307 via bindport(). If SOCK is -1, close MSOCK only. */
311 /*shutdown (sock, 2);*/
319 /* Return the local IP address associated with the connection on FD.
320 It is returned in a static buffer. */
324 static unsigned char res[4];
325 struct sockaddr_in mysrv;
326 struct sockaddr *myaddr;
327 int addrlen = sizeof (mysrv); /* see bindport() for discussion of
330 myaddr = (struct sockaddr *) (&mysrv);
331 if (getsockname (fd, myaddr, (int *)&addrlen) < 0)
333 memcpy (res, &mysrv.sin_addr, 4);
337 /* Read at most LEN bytes from FD, storing them to BUF. This is
338 virtually the same as read(), but takes care of EINTR braindamage
339 and uses select() to timeout the stale connections (a connection is
340 stale if more than OPT.TIMEOUT time is spent in select() or
343 iread (int fd, char *buf, int len)
354 res = select_fd (fd, opt.timeout, 0);
356 while (res == -1 && errno == EINTR);
359 /* Set errno to ETIMEDOUT on timeout. */
361 /* #### Potentially evil! */
367 res = READ (fd, buf, len);
369 while (res == -1 && errno == EINTR);
374 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
375 doesn't bother with select(). Unlike iread(), it makes sure that
376 all of BUF is actually written to FD, so callers needn't bother
377 with checking that the return value equals to LEN. Instead, you
378 should simply check for -1. */
380 iwrite (int fd, char *buf, int len)
384 /* `write' may write less than LEN bytes, thus the outward loop
385 keeps trying it until all was written, or an error occurred. The
386 inner loop is reserved for the usual EINTR f*kage, and the
387 innermost loop deals with the same during select(). */
397 res = select_fd (fd, opt.timeout, 1);
399 while (res == -1 && errno == EINTR);
402 /* Set errno to ETIMEDOUT on timeout. */
404 /* #### Potentially evil! */
410 res = WRITE (fd, buf, len);
412 while (res == -1 && errno == EINTR);