usr.sbin/dntpd/socket.c

   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