Home | History | Annotate | Line # | Download | only in mount_nfs 
      1 /*	$NetBSD: udp_xfer.c,v 1.2 2008/04/29 06:53:01 martin 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 1.2 2008/04/29 06:53:01 martin 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 }
    100