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- /* Establishing and handling network connections.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif /* HAVE_CONFIG_H */
- #include "systhings.h"
-
- #include <stdio.h>
- #include <sys/types.h>
- #ifdef HAVE_UNISTD_H
- # include <unistd.h>
- #endif
-
- #ifdef WINDOWS
- # include <winsock.h>
- # include "windecl.h"
- #else
- # include <sys/socket.h>
- # include <netdb.h>
- # include <netinet/in.h>
- # include <arpa/inet.h>
- #endif /* WINDOWS */
-
- #include <errno.h>
- #ifdef HAVE_STRING_H
- # include <string.h>
- #else
- # include <strings.h>
- #endif /* HAVE_STRING_H */
- #ifdef HAVE_SYS_SELECT_H
- # include <sys/select.h>
- #endif /* HAVE_SYS_SELECT_H */
-
- #include "wget.h"
- #include "options.h"
- #include "utils.h"
- #include "connect.h"
- #include "host.h"
-
- #ifndef errno
- extern int errno;
- #endif
-
- extern struct options opt;
-
- /* Global variables share by bindport and acceptport: */
- int msock = -1, addrlen;
- struct sockaddr *addr;
- struct sockaddr_in srv;
-
-
- uerr_t
- make_connection(int *sock, char *hostname, unsigned short port)
- {
- struct sockaddr_in sock_name;
- /* struct hostent *hptr; */
-
- /* Get internet address of the host. We can do it either by calling
- ngethostbyname, or by calling store_hostaddress, from
- host.c. Storehostaddress is better since it caches calls to
- gethostbyname. */
- #if 1
- if (!store_hostaddress((unsigned char *)&sock_name.sin_addr, hostname))
- return HOSTERR;
- #else /* never */
- if (!(hptr = ngethostbyname(hostname)))
- return HOSTERR;
- /* Copy the address of the host to socket description. */
- memcpy(&sock_name.sin_addr, hptr->h_addr, hptr->h_length);
- #endif
- /* Set port and protocol */
- sock_name.sin_family = AF_INET;
- sock_name.sin_port = htons(port);
- /* Make an internet socket, stream type. */
- if ((*sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
- return CONSOCKERR;
-
- /* Connect the socket to the remote host. */
- if (connect(*sock, (struct sockaddr *) &sock_name, sizeof (sock_name)))
- {
- if (errno == ECONNREFUSED)
- return CONREFUSED;
- else
- return CONERROR;
- }
- #ifdef DEBUG
- if (opt.debug)
- fprintf(opt.lfile, "Created fd %d.\n", *sock);
- #endif
- return NOCONERROR;
- }
-
- /* bindport does all the work necessary to bind a port, creating a
- master socket msock. Use acceptport to call accept and receive the
- actual socket. */
- uerr_t
- bindport(unsigned short *port)
- {
- int optval = 1;
-
- msock = -1;
- addr = (struct sockaddr *) & srv;
- addrlen = sizeof(srv);
- if ((msock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
- return CONSOCKERR;
- if (setsockopt(msock, SOL_SOCKET, SO_REUSEADDR, (char *)&optval, sizeof(optval)) < 0)
- return CONSOCKERR;
- srv.sin_family = AF_INET;
- srv.sin_addr.s_addr = htonl(INADDR_ANY);
- srv.sin_port = htons(*port);
- if (bind(msock, addr, addrlen) < 0)
- {
- CLOSE(msock);
- msock = -1;
- return BINDERR;
- }
- #ifdef DEBUG
- if (opt.debug)
- fprintf(opt.lfile, "Master socket fd %d bound.\n", msock);
- #endif
- if (!*port)
- {
- if (getsockname(msock, addr, &addrlen) < 0)
- {
- CLOSE(msock);
- msock = -1;
- return CONPORTERR;
- }
- *port = ntohs(srv.sin_port);
- }
- if (listen(msock, 1) < 0)
- {
- CLOSE(msock);
- msock = -1;
- return LISTENERR;
- }
- return BINDOK;
- }
-
- /* Acceptport uses msock and addrlen to call the accept system call
- and return the data socket of the connection. It blocks the caller,
- as per accept. */
- uerr_t
- acceptport(int *sock)
- {
- #ifdef HAVE_SELECT
- if (select_fd(msock, opt.timeout) <= 0)
- return ACCEPTERR;
- #endif
- if ((*sock = accept(msock, addr, &addrlen)) < 0)
- return ACCEPTERR;
- #ifdef DEBUG
- if (opt.debug)
- fprintf(opt.lfile, "Created socket fd %d.\n", *sock);
- #endif
- return ACCEPTOK;
- }
-
- /* Closes the sockets. If sock is -1, close only msock (which is
- private to connect.c. */
- void
- closeport(int sock)
- {
- /*shutdown(sock, 2);*/
- if (sock != -1)
- CLOSE(sock);
- if (msock != -1)
- CLOSE(msock);
- msock = -1;
- }
-
- /* Return the local IP address associated with the connection on fd.
- It is returned in a static buffer. */
- unsigned char *
- conaddr(int fd)
- {
- static unsigned char res[4];
- struct sockaddr_in mysrv;
- struct sockaddr *myaddr;
- int len = sizeof(mysrv);
-
- myaddr = (struct sockaddr *)(&mysrv);
- if (getsockname(fd, myaddr, &len) < 0)
- return NULL;
- memcpy(res, &mysrv.sin_addr, 4);
- return res;
- }
-
- #ifdef HAVE_SELECT
- /* select_fd - Waits for file descriptor fd to be readable, where
- maxtime is the timeout in seconds. Returns 1 if fd is readable, 0
- for timeout and -1 for error. */
- int
- select_fd(int fd, int maxtime)
- {
- fd_set readfds, exceptfds;
- struct timeval timeout;
- int nfds;
-
- FD_ZERO(&readfds);
- FD_SET(fd, &readfds);
- FD_ZERO(&exceptfds);
- FD_SET(fd, &exceptfds);
- timeout.tv_sec = maxtime;
- timeout.tv_usec = 0;
- /* This is just a minor HPUX change to avoid warnings. */
- #ifndef __hpux
- nfds = select(fd + 1, &readfds, NULL, &exceptfds, &timeout);
- #else /* __hpux */
- nfds = select(fd + 1, (int *)&readfds, NULL, (int *)&exceptfds, &timeout);
- #endif /* __hpux */
- return nfds;
- }
- #endif /* HAVE_SELECT */
-
- /* The same like read, but takes care of EINTR and uses select to
- timeout the stale connections. */
- int
- iread(int fd, char *buf, int len)
- {
- int res;
-
- do
- {
- #ifdef HAVE_SELECT
- if (opt.timeout)
- {
- do
- {
- res = select_fd(fd, opt.timeout);
- } while (res == -1 && errno == EINTR);
- if (res <= 0)
- {
- /* Set errno to ETIMEDOUT on timeout. */
- if (res == 0)
- errno = ETIMEDOUT;
- return -1;
- }
- }
- #endif
- res = READ(fd, buf, len);
- } while (res == -1 && errno == EINTR);
-
- return res;
- }
-
- /* Similar to iread, but doesn't do select. */
- int
- iwrite(int fd, char *buf, int len)
- {
- int res;
-
- do
- {
- res = WRITE(fd, buf, len);
- } while (res == -1 && errno == EINTR);
-
- return res;
- }
-