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 1.3 2005/04/25 17:42:49 dillon Exp $ 35 */ 36 37 #include "defs.h" 38 39 int 40 udp_socket(const char *target, int port) 41 { 42 struct sockaddr_in sam; 43 struct hostent *hp; 44 int rc; 45 int fd; 46 int tos; 47 48 if ((rc = inet_aton(target, &sam.sin_addr)) == 0) { 49 if ((hp = gethostbyname2(target, AF_INET)) == NULL) { 50 logerr("Unable to resolve %s", target); 51 return(-1); 52 } 53 bcopy(hp->h_addr_list[0], &sam.sin_addr, hp->h_length); 54 } else if (rc != 1) { 55 logerrstr("unable to resolve ip/host: %s", target); 56 return(-1); 57 } 58 if ((fd = socket(PF_INET, SOCK_DGRAM, PF_UNSPEC)) < 0) { 59 logerr("socket(%s)", target); 60 return(-1); 61 } 62 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { 63 logerr("socket(%s) unable to set non-blocking mode", target); 64 close(fd); 65 return(-1); 66 } 67 sam.sin_port = htons(port); 68 sam.sin_len = sizeof(sam); 69 sam.sin_family = AF_INET; 70 if (connect(fd, (void *)&sam, sizeof(sam)) < 0) { 71 logerr("connect(%s)", target); 72 close(fd); 73 return(-1); 74 } 75 #ifdef IPTOS_LOWDELAY 76 tos = IPTOS_LOWDELAY; 77 setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); 78 #endif 79 #if 0 80 #ifdef IP_PORTRANGE 81 tos = IP_PORTRANGE_HIGH; 82 setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, &tos, sizeof(tos)); 83 #endif 84 #endif 85 return(fd); 86 } 87 88