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