1 /*- 2 * Copyright (c) 2004 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <sys/time.h> 32 33 #include <netinet/in.h> 34 35 #include <arpa/inet.h> 36 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 41 static void 42 usage(void) 43 { 44 45 fprintf(stderr, "netreceive [port]\n"); 46 exit(-1); 47 } 48 49 int 50 main(int argc, char *argv[]) 51 { 52 struct sockaddr_in sin; 53 char *dummy, *packet; 54 long port; 55 int s, v; 56 57 if (argc != 2) 58 usage(); 59 60 bzero(&sin, sizeof(sin)); 61 sin.sin_len = sizeof(sin); 62 sin.sin_family = AF_INET; 63 sin.sin_addr.s_addr = htonl(INADDR_ANY); 64 65 port = strtoul(argv[1], &dummy, 10); 66 if (port < 1 || port > 65535 || *dummy != '\0') 67 usage(); 68 sin.sin_port = htons(port); 69 70 packet = malloc(65536); 71 if (packet == NULL) { 72 perror("malloc"); 73 return (-1); 74 } 75 bzero(packet, 65536); 76 77 s = socket(PF_INET, SOCK_DGRAM, 0); 78 if (s == -1) { 79 perror("socket"); 80 return (-1); 81 } 82 83 v = 128 * 1024; 84 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &v, sizeof(v)) < 0) { 85 perror("SO_RCVBUF"); 86 return (-1); 87 } 88 89 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 90 perror("bind"); 91 return (-1); 92 } 93 94 printf("netreceive listening on UDP port %d\n", (u_short)port); 95 96 while (1) { 97 if (recv(s, packet, 65536, 0) < 0) 98 perror("recv"); 99 } 100 } 101