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>
31 # include <sys/socket.h>
33 # include <netinet/in.h>
35 # include <arpa/inet.h>
44 #endif /* HAVE_STRING_H */
45 #ifdef HAVE_SYS_SELECT_H
46 # include <sys/select.h>
47 #endif /* HAVE_SYS_SELECT_H */
57 /* Variables shared by bindport and acceptport: */
58 static int msock = -1;
59 static struct sockaddr *addr;
62 /* Create an internet connection to HOSTNAME on PORT. The created
63 socket will be stored to *SOCK. */
65 make_connection (int *sock, char *hostname, unsigned short port)
67 struct sockaddr_in sock_name;
69 if (!lookup_host (hostname, (unsigned char *)&sock_name.sin_addr))
72 /* Set port and protocol */
73 sock_name.sin_family = AF_INET;
74 sock_name.sin_port = htons (port);
76 /* Make an internet socket, stream type. */
77 if ((*sock = socket (AF_INET, SOCK_STREAM, 0)) == -1)
80 if (opt.bind_address != NULL)
82 /* Bind the client side to the requested address. */
83 if (bind (*sock, (struct sockaddr *) opt.bind_address,
84 sizeof (*opt.bind_address)))
88 /* Connect the socket to the remote host. */
89 if (connect (*sock, (struct sockaddr *) &sock_name, sizeof (sock_name)))
91 if (errno == ECONNREFUSED)
96 DEBUGP (("Created fd %d.\n", *sock));
101 test_socket_open (int sock)
107 /* Check if we still have a valid (non-EOF) connection. From Andrew
108 * Maholski's code in the Unix Socket FAQ. */
110 FD_ZERO (&check_set);
111 FD_SET (sock, &check_set);
113 /* Wait one microsecond */
117 /* If we get a timeout, then that means still connected */
118 if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
120 /* Connection is valid (not EOF), so continue */
126 /* Without select, it's hard to know for sure. */
131 /* Bind the local port PORT. This does all the necessary work, which
132 is creating a socket, setting SO_REUSEADDR option on it, then
133 calling bind() and listen(). If *PORT is 0, a random port is
134 chosen by the system, and its value is stored to *PORT. The
135 internal variable MPORT is set to the value of the ensuing master
136 socket. Call acceptport() to block for and accept a connection. */
138 bindport (unsigned short *port)
141 static struct sockaddr_in srv;
144 addr = (struct sockaddr *) &srv;
145 if ((msock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
147 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
148 (char *)&optval, sizeof (optval)) < 0)
151 if (opt.bind_address == NULL)
153 srv.sin_family = AF_INET;
154 srv.sin_addr.s_addr = htonl (INADDR_ANY);
157 srv = *opt.bind_address;
159 srv.sin_port = htons (*port);
160 if (bind (msock, addr, sizeof (struct sockaddr_in)) < 0)
166 DEBUGP (("Master socket fd %d bound.\n", msock));
169 /* #### addrlen should be a 32-bit type, which int is not
170 guaranteed to be. Oh, and don't try to make it a size_t,
171 because that can be 64-bit. */
172 int addrlen = sizeof (struct sockaddr_in);
173 if (getsockname (msock, addr, &addrlen) < 0)
179 *port = ntohs (srv.sin_port);
181 if (listen (msock, 1) < 0)
191 /* Wait for file descriptor FD to be readable, MAXTIME being the
192 timeout in seconds. If WRITEP is non-zero, checks for FD being
195 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
198 select_fd (int fd, int maxtime, int writep)
200 fd_set fds, exceptfds;
201 struct timeval timeout;
205 FD_ZERO (&exceptfds);
206 FD_SET (fd, &exceptfds);
207 timeout.tv_sec = maxtime;
209 /* HPUX reportedly warns here. What is the correct incantation? */
210 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
211 &exceptfds, &timeout);
213 #endif /* HAVE_SELECT */
215 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
216 that bindport() has been used to initialize MSOCK to a correct
217 value. It blocks the caller until a connection is established. If
218 no connection is established for OPT.TIMEOUT seconds, the function
219 exits with an error status. */
221 acceptport (int *sock)
223 int addrlen = sizeof (struct sockaddr_in);
226 if (select_fd (msock, opt.timeout, 0) <= 0)
229 if ((*sock = accept (msock, addr, &addrlen)) < 0)
231 DEBUGP (("Created socket fd %d.\n", *sock));
235 /* Close SOCK, as well as the most recently remembered MSOCK, created
236 via bindport(). If SOCK is -1, close MSOCK only. */
240 /*shutdown (sock, 2);*/
248 /* Return the local IP address associated with the connection on FD.
249 It is returned in a static buffer. */
253 static unsigned char res[4];
254 struct sockaddr_in mysrv;
255 struct sockaddr *myaddr;
256 int addrlen = sizeof (mysrv); /* see bindport() for discussion of
259 myaddr = (struct sockaddr *) (&mysrv);
260 if (getsockname (fd, myaddr, (int *)&addrlen) < 0)
262 memcpy (res, &mysrv.sin_addr, 4);
266 /* Read at most LEN bytes from FD, storing them to BUF. This is
267 virtually the same as read(), but takes care of EINTR braindamage
268 and uses select() to timeout the stale connections (a connection is
269 stale if more than OPT.TIMEOUT time is spent in select() or
272 iread (int fd, char *buf, int len)
283 res = select_fd (fd, opt.timeout, 0);
285 while (res == -1 && errno == EINTR);
288 /* Set errno to ETIMEDOUT on timeout. */
290 /* #### Potentially evil! */
296 res = READ (fd, buf, len);
298 while (res == -1 && errno == EINTR);
303 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
304 doesn't bother with select(). Unlike iread(), it makes sure that
305 all of BUF is actually written to FD, so callers needn't bother
306 with checking that the return value equals to LEN. Instead, you
307 should simply check for -1. */
309 iwrite (int fd, char *buf, int len)
313 /* `write' may write less than LEN bytes, thus the outward loop
314 keeps trying it until all was written, or an error occurred. The
315 inner loop is reserved for the usual EINTR f*kage, and the
316 innermost loop deals with the same during select(). */
326 res = select_fd (fd, opt.timeout, 1);
328 while (res == -1 && errno == EINTR);
331 /* Set errno to ETIMEDOUT on timeout. */
333 /* #### Potentially evil! */
339 res = WRITE (fd, buf, len);
341 while (res == -1 && errno == EINTR);