sbin/mount_nfs/udp_xfer.c

   1 /*      $NetBSD: udp_xfer.c,v 1.1 2006/01/21 10:32:23 dsl Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by David Laight.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: udp_xfer.c,v 1.1 2006/01/21 10:32:23 dsl Exp $");
  34
  35 #include <sys/types.h>
  36 #include <unistd.h>
  37 #include <sys/socket.h>
  38 #include <netinet/in.h>
  39 #include <sys/poll.h>
  40 #include <netdb.h>
  41 #include <err.h>
  42
  43 typedef uint32_t n_long;
  44 #include <net.h>
  45
  46 void
  47 set_port(struct sockaddr *sa, int port)
  48 {
  49
  50         switch (sa->sa_family) {
  51         case AF_INET:
  52                 ((struct sockaddr_in *)sa)->sin_port = port;
  53                 break;
  54 #ifdef INET6
  55         case AF_INET6:
  56                 ((struct sockaddr_in6 *)sa)->sin6_port = port;
  57                 break;
  58 #endif
  59         default:
  60                 errx(1, "Unsupported socket family %d",
  61                     sa->sa_family);
  62         }
  63 }
  64
  65 ssize_t
  66 sendudp(struct iodesc *d, void *pkt, size_t len)
  67 {
  68         int sock;
  69         int range = IP_PORTRANGE_LOW;
  70
  71         if (d->socket >= 0) {
  72                 close(d->socket);
  73                 d->socket = -1;
  74         }
  75
  76         sock = socket(d->ai->ai_family, SOCK_DGRAM, IPPROTO_UDP);
  77         if (sock < 0)
  78                 return -1;
  79         d->socket = sock;
  80         set_port(d->ai->ai_addr, d->destport);
  81
  82         setsockopt(sock, IPPROTO_IP, IP_PORTRANGE, &range, sizeof(range));
  83
  84         if (connect(sock, d->ai->ai_addr, d->ai->ai_addrlen) != 0)
  85                 return -1;
  86
  87         return send(sock, pkt, len, 0);
  88 }
  89
  90 ssize_t
  91 readudp(struct iodesc *d, void *pkt, size_t len, time_t tleft)
  92 {
  93         struct pollfd pfd = {d->socket, POLLIN, 0};
  94
  95         if (poll(&pfd, 1, tleft * 1000) != 1)
  96                 return -1;
  97
  98         return recv(d->socket, pkt, len, 0);
  99 }