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 /* Connect the socket to the remote host. */
91 if (connect (*sock, (struct sockaddr *) &sock_name, sizeof (sock_name)))
93 if (errno == ECONNREFUSED)
98 DEBUGP (("Created fd %d.\n", *sock));
102 /* Bind the local port PORT. This does all the necessary work, which
103 is creating a socket, setting SO_REUSEADDR option on it, then
104 calling bind() and listen(). If *PORT is 0, a random port is
105 chosen by the system, and its value is stored to *PORT. The
106 internal variable MPORT is set to the value of the ensuing master
107 socket. Call acceptport() to block for and accept a connection. */
109 bindport (unsigned short *port)
112 static struct sockaddr_in srv;
115 addr = (struct sockaddr *) &srv;
116 if ((msock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
118 if (setsockopt (msock, SOL_SOCKET, SO_REUSEADDR,
119 (char *)&optval, sizeof (optval)) < 0)
121 srv.sin_family = AF_INET;
122 srv.sin_addr.s_addr = htonl (INADDR_ANY);
123 srv.sin_port = htons (*port);
124 if (bind (msock, addr, sizeof (struct sockaddr_in)) < 0)
130 DEBUGP (("Master socket fd %d bound.\n", msock));
133 size_t addrlen = sizeof (struct sockaddr_in);
134 if (getsockname (msock, addr, (int *)&addrlen) < 0)
140 *port = ntohs (srv.sin_port);
142 if (listen (msock, 1) < 0)
152 /* Wait for file descriptor FD to be readable, MAXTIME being the
153 timeout in seconds. If WRITEP is non-zero, checks for FD being
156 Returns 1 if FD is accessible, 0 for timeout and -1 for error in
159 select_fd (int fd, int maxtime, int writep)
161 fd_set fds, exceptfds;
162 struct timeval timeout;
166 FD_ZERO (&exceptfds);
167 FD_SET (fd, &exceptfds);
168 timeout.tv_sec = maxtime;
170 /* HPUX reportedly warns here. What is the correct incantation? */
171 return select (fd + 1, writep ? NULL : &fds, writep ? &fds : NULL,
172 &exceptfds, &timeout);
174 #endif /* HAVE_SELECT */
176 /* Call accept() on MSOCK and store the result to *SOCK. This assumes
177 that bindport() has been used to initialize MSOCK to a correct
178 value. It blocks the caller until a connection is established. If
179 no connection is established for OPT.TIMEOUT seconds, the function
180 exits with an error status. */
182 acceptport (int *sock)
184 int addrlen = sizeof (struct sockaddr_in);
187 if (select_fd (msock, opt.timeout, 0) <= 0)
190 if ((*sock = accept (msock, addr, &addrlen)) < 0)
192 DEBUGP (("Created socket fd %d.\n", *sock));
196 /* Close SOCK, as well as the most recently remembered MSOCK, created
197 via bindport(). If SOCK is -1, close MSOCK only. */
201 /*shutdown (sock, 2);*/
209 /* Return the local IP address associated with the connection on FD.
210 It is returned in a static buffer. */
214 static unsigned char res[4];
215 struct sockaddr_in mysrv;
216 struct sockaddr *myaddr;
217 size_t addrlen = sizeof (mysrv);
219 myaddr = (struct sockaddr *) (&mysrv);
220 if (getsockname (fd, myaddr, (int *)&addrlen) < 0)
222 memcpy (res, &mysrv.sin_addr, 4);
226 /* Read at most LEN bytes from FD, storing them to BUF. This is
227 virtually the same as read(), but takes care of EINTR braindamage
228 and uses select() to timeout the stale connections (a connection is
229 stale if more than OPT.TIMEOUT time is spent in select() or
232 iread (int fd, char *buf, int len)
243 res = select_fd (fd, opt.timeout, 0);
245 while (res == -1 && errno == EINTR);
248 /* Set errno to ETIMEDOUT on timeout. */
250 /* #### Potentially evil! */
256 res = READ (fd, buf, len);
258 while (res == -1 && errno == EINTR);
263 /* Write LEN bytes from BUF to FD. This is similar to iread(), but
264 doesn't bother with select(). Unlike iread(), it makes sure that
265 all of BUF is actually written to FD, so callers needn't bother
266 with checking that the return value equals to LEN. Instead, you
267 should simply check for -1. */
269 iwrite (int fd, char *buf, int len)
273 /* `write' may write less than LEN bytes, thus the outward loop
274 keeps trying it until all was written, or an error occurred. The
275 inner loop is reserved for the usual EINTR f*kage, and the
276 innermost loop deals with the same during select(). */
286 res = select_fd (fd, opt.timeout, 1);
288 while (res == -1 && errno == EINTR);
291 /* Set errno to ETIMEDOUT on timeout. */
293 /* #### Potentially evil! */
299 res = WRITE (fd, buf, len);
301 while (res == -1 && errno == EINTR);