1 /* Establishing and handling network connections.
2 Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of Wget.
6 This program 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 This program 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 this program; 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>
34 # include <arpa/inet.h>
42 #endif /* HAVE_STRING_H */
43 #ifdef HAVE_SYS_SELECT_H
44 # include <sys/select.h>
45 #endif /* HAVE_SYS_SELECT_H */
55 /* Variables shared by bindport and acceptport: */
56 static int msock = -1;
57 static struct sockaddr *addr;
60 /* Create an internet connection to HOSTNAME on PORT. The created
61 socket will be stored to *SOCK. */
63 make_connection (int *sock, char *hostname, unsigned short port)
65 struct sockaddr_in sock_name;
66 /* struct hostent *hptr; */
68 /* Get internet address of the host. We can do it either by calling
69 ngethostbyname, or by calling store_hostaddress, from host.c.
70 storehostaddress is better since it caches calls to
73 if (!store_hostaddress ((unsigned char *)&sock_name.sin_addr, hostname))
76 if (!(hptr = ngethostbyname (hostname)))
78 /* Copy the address of the host to socket description. */
79 memcpy (&sock_name.sin_addr, hptr->h_addr, hptr->h_length);
82 /* Set port and protocol */
83 sock_name.sin_family = AF_INET;
84 sock_name.sin_port = htons (port);
86 /* Make an internet socket, stream type. */
87 if ((*sock = socket (AF_INET, SOCK_STREAM, 0)) == -1)
90 if (opt.bind_address != NULL)
92 /* Bind the client side to the requested address. */
93 if (bind (*sock, (struct sockaddr *) opt.bind_address,
94 sizeof (*opt.bind_address)))
98 /* Connect the socket to the remote host. */
99 if (connect (*sock, (struct sockaddr *) &sock_name, sizeof (sock_name)))
101 if (errno == ECONNREFUSED)
106 DEBUGP (("Created fd %d.\n", *sock));
110 /* Bind the local port PORT. This does all the necessary work, which
111 is creating a socket, setting SO_REUSEADDR option on it, then
112 calling bind() and listen(). If *PORT is 0, a random port is
113 chosen by the system, and its value is stored to *PORT. The
114 internal variable MPORT is set to the value of the ensuing master
115 socket. Call acceptport() to block for and accept a connection. */
117 bindport (unsigned short *port)
120 static struct sockaddr_in srv;
123 addr = (struct sockaddr *) &srv;
124 if ((msock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
126 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
127 (char *)&optval, sizeof (optval)) < 0)
130 if (opt.bind_address == NULL)
132 srv.sin_family = AF_INET;
133 srv.sin_addr.s_addr = htonl (INADDR_ANY);
136 srv = *opt.bind_address;
138 srv.sin_port = htons (*port);
139 if (bind (msock, addr, sizeof (struct sockaddr_in)) < 0)
145 DEBUGP (("Master socket fd %d bound.\n", msock));
148 size_t addrlen = sizeof (struct sockaddr_in);
149 if (getsockname (msock, addr, (int *)&addrlen) < 0)
155 *port = ntohs (srv.sin_port);
157 if (listen (msock, 1) < 0)
167 /* Wait for file descriptor FD to be readable, MAXTIME being the
168 timeout in seconds. If WRITEP is non-zero, checks for FD being
171 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
174 select_fd (int fd, int maxtime, int writep)
176 fd_set fds, exceptfds;
177 struct timeval timeout;
181 FD_ZERO (&exceptfds);
182 FD_SET (fd, &exceptfds);
183 timeout.tv_sec = maxtime;
185 /* HPUX reportedly warns here. What is the correct incantation? */
186 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
187 &exceptfds, &timeout);
189 #endif /* HAVE_SELECT */
191 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
192 that bindport() has been used to initialize MSOCK to a correct
193 value. It blocks the caller until a connection is established. If
194 no connection is established for OPT.TIMEOUT seconds, the function
195 exits with an error status. */
197 acceptport (int *sock)
199 int addrlen = sizeof (struct sockaddr_in);
202 if (select_fd (msock, opt.timeout, 0) <= 0)
205 if ((*sock = accept (msock, addr, &addrlen)) < 0)
207 DEBUGP (("Created socket fd %d.\n", *sock));
211 /* Close SOCK, as well as the most recently remembered MSOCK, created
212 via bindport(). If SOCK is -1, close MSOCK only. */
216 /*shutdown (sock, 2);*/
224 /* Return the local IP address associated with the connection on FD.
225 It is returned in a static buffer. */
229 static unsigned char res[4];
230 struct sockaddr_in mysrv;
231 struct sockaddr *myaddr;
232 size_t addrlen = sizeof (mysrv);
234 myaddr = (struct sockaddr *) (&mysrv);
235 if (getsockname (fd, myaddr, (int *)&addrlen) < 0)
237 memcpy (res, &mysrv.sin_addr, 4);
241 /* Read at most LEN bytes from FD, storing them to BUF. This is
242 virtually the same as read(), but takes care of EINTR braindamage
243 and uses select() to timeout the stale connections (a connection is
244 stale if more than OPT.TIMEOUT time is spent in select() or
247 iread (int fd, char *buf, int len)
258 res = select_fd (fd, opt.timeout, 0);
260 while (res == -1 && errno == EINTR);
263 /* Set errno to ETIMEDOUT on timeout. */
265 /* #### Potentially evil! */
271 res = READ (fd, buf, len);
273 while (res == -1 && errno == EINTR);
278 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
279 doesn't bother with select(). Unlike iread(), it makes sure that
280 all of BUF is actually written to FD, so callers needn't bother
281 with checking that the return value equals to LEN. Instead, you
282 should simply check for -1. */
284 iwrite (int fd, char *buf, int len)
288 /* `write' may write less than LEN bytes, thus the outward loop
289 keeps trying it until all was written, or an error occurred. The
290 inner loop is reserved for the usual EINTR f*kage, and the
291 innermost loop deals with the same during select(). */
301 res = select_fd (fd, opt.timeout, 1);
303 while (res == -1 && errno == EINTR);
306 /* Set errno to ETIMEDOUT on timeout. */
308 /* #### Potentially evil! */
314 res = WRITE (fd, buf, len);
316 while (res == -1 && errno == EINTR);