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;
68 /* struct hostent *hptr; */
70 /* Get internet address of the host. We can do it either by calling
71 ngethostbyname, or by calling store_hostaddress, from host.c.
72 storehostaddress is better since it caches calls to
75 if (!store_hostaddress ((unsigned char *)&sock_name.sin_addr, hostname))
78 if (!(hptr = ngethostbyname (hostname)))
80 /* Copy the address of the host to socket description. */
81 memcpy (&sock_name.sin_addr, hptr->h_addr, hptr->h_length);
84 /* Set port and protocol */
85 sock_name.sin_family = AF_INET;
86 sock_name.sin_port = htons (port);
88 /* Make an internet socket, stream type. */
89 if ((*sock = socket (AF_INET, SOCK_STREAM, 0)) == -1)
92 if (opt.bind_address != NULL)
94 /* Bind the client side to the requested address. */
95 if (bind (*sock, (struct sockaddr *) opt.bind_address,
96 sizeof (*opt.bind_address)))
100 /* Connect the socket to the remote host. */
101 if (connect (*sock, (struct sockaddr *) &sock_name, sizeof (sock_name)))
103 if (errno == ECONNREFUSED)
108 DEBUGP (("Created fd %d.\n", *sock));
113 test_socket_open (int sock)
119 /* Check if we still have a valid (non-EOF) connection. From Andrew
120 * Maholski's code in the Unix Socket FAQ. */
122 FD_ZERO (&check_set);
123 FD_SET (sock, &check_set);
125 /* Wait one microsecond */
129 /* If we get a timeout, then that means still connected */
130 if (select (sock + 1, &check_set, NULL, NULL, &to) == 0)
132 /* Connection is valid (not EOF), so continue */
138 /* Without select, it's hard to know for sure. */
143 /* Bind the local port PORT. This does all the necessary work, which
144 is creating a socket, setting SO_REUSEADDR option on it, then
145 calling bind() and listen(). If *PORT is 0, a random port is
146 chosen by the system, and its value is stored to *PORT. The
147 internal variable MPORT is set to the value of the ensuing master
148 socket. Call acceptport() to block for and accept a connection. */
150 bindport (unsigned short *port)
153 static struct sockaddr_in srv;
156 addr = (struct sockaddr *) &srv;
157 if ((msock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
159 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
160 (char *)&optval, sizeof (optval)) < 0)
163 if (opt.bind_address == NULL)
165 srv.sin_family = AF_INET;
166 srv.sin_addr.s_addr = htonl (INADDR_ANY);
169 srv = *opt.bind_address;
171 srv.sin_port = htons (*port);
172 if (bind (msock, addr, sizeof (struct sockaddr_in)) < 0)
178 DEBUGP (("Master socket fd %d bound.\n", msock));
181 /* #### addrlen should be a 32-bit type, which int is not
182 guaranteed to be. Oh, and don't try to make it a size_t,
183 because that can be 64-bit. */
184 int addrlen = sizeof (struct sockaddr_in);
185 if (getsockname (msock, addr, &addrlen) < 0)
191 *port = ntohs (srv.sin_port);
193 if (listen (msock, 1) < 0)
203 /* Wait for file descriptor FD to be readable, MAXTIME being the
204 timeout in seconds. If WRITEP is non-zero, checks for FD being
207 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
210 select_fd (int fd, int maxtime, int writep)
212 fd_set fds, exceptfds;
213 struct timeval timeout;
217 FD_ZERO (&exceptfds);
218 FD_SET (fd, &exceptfds);
219 timeout.tv_sec = maxtime;
221 /* HPUX reportedly warns here. What is the correct incantation? */
222 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
223 &exceptfds, &timeout);
225 #endif /* HAVE_SELECT */
227 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
228 that bindport() has been used to initialize MSOCK to a correct
229 value. It blocks the caller until a connection is established. If
230 no connection is established for OPT.TIMEOUT seconds, the function
231 exits with an error status. */
233 acceptport (int *sock)
235 int addrlen = sizeof (struct sockaddr_in);
238 if (select_fd (msock, opt.timeout, 0) <= 0)
241 if ((*sock = accept (msock, addr, &addrlen)) < 0)
243 DEBUGP (("Created socket fd %d.\n", *sock));
247 /* Close SOCK, as well as the most recently remembered MSOCK, created
248 via bindport(). If SOCK is -1, close MSOCK only. */
252 /*shutdown (sock, 2);*/
260 /* Return the local IP address associated with the connection on FD.
261 It is returned in a static buffer. */
265 static unsigned char res[4];
266 struct sockaddr_in mysrv;
267 struct sockaddr *myaddr;
268 int addrlen = sizeof (mysrv); /* see bindport() for discussion of
271 myaddr = (struct sockaddr *) (&mysrv);
272 if (getsockname (fd, myaddr, (int *)&addrlen) < 0)
274 memcpy (res, &mysrv.sin_addr, 4);
278 /* Read at most LEN bytes from FD, storing them to BUF. This is
279 virtually the same as read(), but takes care of EINTR braindamage
280 and uses select() to timeout the stale connections (a connection is
281 stale if more than OPT.TIMEOUT time is spent in select() or
284 iread (int fd, char *buf, int len)
295 res = select_fd (fd, opt.timeout, 0);
297 while (res == -1 && errno == EINTR);
300 /* Set errno to ETIMEDOUT on timeout. */
302 /* #### Potentially evil! */
308 res = READ (fd, buf, len);
310 while (res == -1 && errno == EINTR);
315 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
316 doesn't bother with select(). Unlike iread(), it makes sure that
317 all of BUF is actually written to FD, so callers needn't bother
318 with checking that the return value equals to LEN. Instead, you
319 should simply check for -1. */
321 iwrite (int fd, char *buf, int len)
325 /* `write' may write less than LEN bytes, thus the outward loop
326 keeps trying it until all was written, or an error occurred. The
327 inner loop is reserved for the usual EINTR f*kage, and the
328 innermost loop deals with the same during select(). */
338 res = select_fd (fd, opt.timeout, 1);
340 while (res == -1 && errno == EINTR);
343 /* Set errno to ETIMEDOUT on timeout. */
345 /* #### Potentially evil! */
351 res = WRITE (fd, buf, len);
353 while (res == -1 && errno == EINTR);