1 /* 2 * Copyright (c) 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/usr.sbin/dntpd/socket.c,v 1.4 2007/06/25 21:33:36 dillon Exp $ 35 */ 36 37 #include "defs.h" 38 39 int 40 udp_socket(const char *target, int port, struct sockaddr *sam) 41 { 42 struct addrinfo hints, *res, *res0; 43 char servname[128]; 44 const char *cause = NULL; 45 int error; 46 int fd; 47 int tos; 48 49 memset(&hints, 0, sizeof(hints)); 50 hints.ai_family = family; 51 hints.ai_socktype = SOCK_DGRAM; 52 snprintf(servname, sizeof(servname), "%d", port); 53 error = getaddrinfo(target, servname, &hints, &res0); 54 if (error) { 55 logerr("getaddrinfo (%s) init error", target, gai_strerror(error)); 56 return(-1); 57 } 58 59 fd = -1; 60 for (res = res0; res; res = res->ai_next) { 61 fd = socket(res->ai_family, res->ai_socktype, 62 res->ai_protocol); 63 if (fd < 0) { 64 cause = "socket"; 65 continue; 66 } 67 68 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { 69 logerr("%s: unable to set non-blocking mode", target); 70 close(fd); 71 fd = -1; 72 continue; 73 } 74 75 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) { 76 cause = "connect"; 77 close(fd); 78 fd = -1; 79 continue; 80 } 81 82 break; /* okay we got one */ 83 } 84 85 if (fd < 0) { 86 logerr("Unable to establish a connection with %s: %s", target, cause); 87 return(-1); 88 } 89 memcpy(sam, res->ai_addr, res->ai_addr->sa_len); 90 freeaddrinfo(res0); 91 92 #ifdef IPTOS_LOWDELAY 93 tos = IPTOS_LOWDELAY; 94 setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); 95 #endif 96 #if 0 97 #ifdef IP_PORTRANGE 98 tos = IP_PORTRANGE_HIGH; 99 setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, &tos, sizeof(tos)); 100 #endif 101 #endif 102 return(fd); 103 } 104