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      1 /*      $NetBSD: h_netget.c,v 1.2 2012/04/17 09:23:21 jruoho Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * simple utility to fetch a webpage.  we wouldn't need this
     30  * if we had something like netcat in base
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __RCSID("$NetBSD: h_netget.c,v 1.2 2012/04/17 09:23:21 jruoho Exp $");
     35 
     36 #include <sys/types.h>
     37 #include <sys/socket.h>
     38 
     39 #include <arpa/inet.h>
     40 
     41 #include <netinet/in.h>
     42 
     43 #include <err.h>
     44 #include <fcntl.h>
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 #include <unistd.h>
     49 
     50 #define GETSTR "GET / HTTP/1.0\n\n"
     51 
     52 int
     53 main(int argc, char *argv[])
     54 {
     55 	char buf[8192];
     56 	struct sockaddr_in sin;
     57 	ssize_t n;
     58 	int s, fd;
     59 
     60 	setprogname(argv[0]);
     61 	if (argc != 4) {
     62 		fprintf(stderr, "usage: %s address port savefile\n",
     63 		    getprogname());
     64 		return EXIT_FAILURE;
     65 	}
     66 
     67 	s = socket(PF_INET, SOCK_STREAM, 0);
     68 	if (s == -1)
     69 		err(EXIT_FAILURE, "socket");
     70 
     71 	memset(&sin, 0, sizeof(sin));
     72 	sin.sin_len = sizeof(sin);
     73 	sin.sin_family = AF_INET;
     74 	sin.sin_port = htons(atoi(argv[2]));
     75 	sin.sin_addr.s_addr = inet_addr(argv[1]);
     76 
     77 	fd = open(argv[3], O_CREAT | O_RDWR, 0644);
     78 	if (fd == -1)
     79 		err(EXIT_FAILURE, "open");
     80 	if (ftruncate(fd, 0) == -1)
     81 		err(EXIT_FAILURE, "ftruncate savefile");
     82 
     83 	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) == -1)
     84 		err(EXIT_FAILURE, "connect");
     85 
     86 	if (write(s, GETSTR, strlen(GETSTR)) != strlen(GETSTR))
     87 		err(EXIT_FAILURE, "socket write");
     88 
     89 	for (;;) {
     90 		n = read(s, buf, sizeof(buf));
     91 		if (n == 0)
     92 			break;
     93 		if (n == -1)
     94 			err(EXIT_FAILURE, "socket read");
     95 
     96 		if (write(fd, buf, n) != n)
     97 			err(EXIT_FAILURE, "write file");
     98 	}
     99 
    100 	return EXIT_SUCCESS;
    101 }
    102