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_in *sam) 41 { 42 struct hostent *hp; 43 int rc; 44 int fd; 45 int tos; 46 47 if ((rc = inet_aton(target, &sam->sin_addr)) == 0) { 48 if ((hp = gethostbyname2(target, AF_INET)) == NULL) { 49 logerr("Unable to resolve server %s", target); 50 return(-1); 51 } 52 bcopy(hp->h_addr_list[0], &sam->sin_addr, hp->h_length); 53 } else if (rc != 1) { 54 logerrstr("unable to resolve server %s", target); 55 return(-1); 56 } 57 if ((fd = socket(PF_INET, SOCK_DGRAM, PF_UNSPEC)) < 0) { 58 logerr("socket(%s)", target); 59 return(-1); 60 } 61 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { 62 logerr("socket(%s) unable to set non-blocking mode", target); 63 close(fd); 64 return(-1); 65 } 66 sam->sin_port = htons(port); 67 sam->sin_len = sizeof(sam); 68 sam->sin_family = AF_INET; 69 if (connect(fd, (void *)sam, sizeof(*sam)) < 0) { 70 logerr("connect(%s)", target); 71 close(fd); 72 return(-1); 73 } 74 #ifdef IPTOS_LOWDELAY 75 tos = IPTOS_LOWDELAY; 76 setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); 77 #endif 78 #if 0 79 #ifdef IP_PORTRANGE 80 tos = IP_PORTRANGE_HIGH; 81 setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, &tos, sizeof(tos)); 82 #endif 83 #endif 84 return(fd); 85 } 86 87