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 dns_error_policy_t dns_error_policy) 42 { 43 struct addrinfo hints, *res, *res0; 44 char servname[128]; 45 const char *cause = NULL; 46 int error; 47 int fd; 48 int tos; 49 50 memset(&hints, 0, sizeof(hints)); 51 hints.ai_family = family; 52 hints.ai_socktype = SOCK_DGRAM; 53 snprintf(servname, sizeof(servname), "%d", port); 54 error = getaddrinfo(target, servname, &hints, &res0); 55 if (error) { 56 if (dns_error_policy == LOG_DNS_ERROR) 57 logerr("getaddrinfo (%s) init error: %s", target, 58 gai_strerror(error)); 59 return(-1); 60 } 61 62 fd = -1; 63 for (res = res0; res; res = res->ai_next) { 64 fd = socket(res->ai_family, res->ai_socktype, 65 res->ai_protocol); 66 if (fd < 0) { 67 cause = "socket"; 68 continue; 69 } 70 71 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { 72 logerr("%s: unable to set non-blocking mode", target); 73 close(fd); 74 fd = -1; 75 continue; 76 } 77 78 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) { 79 cause = "connect"; 80 close(fd); 81 fd = -1; 82 continue; 83 } 84 85 break; /* okay we got one */ 86 } 87 88 if (fd < 0) { 89 logerr("Unable to establish a connection with %s: %s", target, cause); 90 return(-1); 91 } 92 memcpy(sam, res->ai_addr, res->ai_addr->sa_len); 93 freeaddrinfo(res0); 94 95 #ifdef IPTOS_LOWDELAY 96 tos = IPTOS_LOWDELAY; 97 setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); 98 #endif 99 #if 0 100 #ifdef IP_PORTRANGE 101 tos = IP_PORTRANGE_HIGH; 102 setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, &tos, sizeof(tos)); 103 #endif 104 #endif 105 return(fd); 106 } 107