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c5b86c3b76
bootp/arp/rarp/rpc all use the sendrecv implementation in net.c. tftp has its own implementation because it passes an extra parameter into the recv callback for the received payload type to be held. These sendrecv implementations are otherwise equivalent, so consolidate them. The other users of sendrecv won't be using the extra argument to recv, but this gives us only one place to worry about respecting timeouts and one consistent timeout behavior. Tested by: sbruno Reviewed by: sbruno, tsoome MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D14373
220 lines
5.4 KiB
C
220 lines
5.4 KiB
C
/* $NetBSD: rarp.c,v 1.16 1997/07/07 15:52:52 drochner Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: arp.c,v 1.5 93/07/15 05:52:26 leres Exp (LBL)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netinet/in_systm.h>
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#include <string.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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static ssize_t rarpsend(struct iodesc *, void *, size_t);
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static ssize_t rarprecv(struct iodesc *, void **, void **, time_t, void *);
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/*
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* Ethernet (Reverse) Address Resolution Protocol (see RFC 903, and 826).
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*/
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int
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rarp_getipaddress(int sock)
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{
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struct iodesc *d;
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struct ether_arp *ap;
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void *pkt;
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struct {
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u_char header[ETHER_SIZE];
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struct {
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struct ether_arp arp;
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u_char pad[18]; /* 60 - sizeof(arp) */
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} data;
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} wbuf;
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#ifdef RARP_DEBUG
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if (debug)
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printf("rarp: socket=%d\n", sock);
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#endif
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if (!(d = socktodesc(sock))) {
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printf("rarp: bad socket. %d\n", sock);
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return (-1);
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}
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#ifdef RARP_DEBUG
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if (debug)
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printf("rarp: d=%x\n", (u_int)d);
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#endif
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bzero((char*)&wbuf.data, sizeof(wbuf.data));
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ap = &wbuf.data.arp;
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ap->arp_hrd = htons(ARPHRD_ETHER);
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ap->arp_pro = htons(ETHERTYPE_IP);
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ap->arp_hln = sizeof(ap->arp_sha); /* hardware address length */
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ap->arp_pln = sizeof(ap->arp_spa); /* protocol address length */
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ap->arp_op = htons(ARPOP_REVREQUEST);
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bcopy(d->myea, ap->arp_sha, 6);
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bcopy(d->myea, ap->arp_tha, 6);
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pkt = NULL;
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if (sendrecv(d,
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rarpsend, &wbuf.data, sizeof(wbuf.data),
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rarprecv, &pkt, (void *)&ap, NULL) < 0) {
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printf("No response for RARP request\n");
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return (-1);
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}
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bcopy(ap->arp_tpa, (char *)&myip, sizeof(myip));
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#if 0
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/* XXX - Can NOT assume this is our root server! */
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bcopy(ap->arp_spa, (char *)&rootip, sizeof(rootip));
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#endif
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free(pkt);
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/* Compute our "natural" netmask. */
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if (IN_CLASSA(myip.s_addr))
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netmask = IN_CLASSA_NET;
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else if (IN_CLASSB(myip.s_addr))
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netmask = IN_CLASSB_NET;
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else
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netmask = IN_CLASSC_NET;
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d->myip = myip;
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return (0);
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}
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/*
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* Broadcast a RARP request (i.e. who knows who I am)
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*/
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static ssize_t
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rarpsend(struct iodesc *d, void *pkt, size_t len)
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{
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#ifdef RARP_DEBUG
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if (debug)
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printf("rarpsend: called\n");
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#endif
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return (sendether(d, pkt, len, bcea, ETHERTYPE_REVARP));
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}
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/*
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* Returns 0 if this is the packet we're waiting for
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* else -1 (and errno == 0)
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*/
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static ssize_t
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rarprecv(struct iodesc *d, void **pkt, void **payload, time_t tleft,
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void *extra)
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{
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ssize_t n;
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struct ether_arp *ap;
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void *ptr = NULL;
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uint16_t etype; /* host order */
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#ifdef RARP_DEBUG
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if (debug)
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printf("rarprecv: ");
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#endif
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n = readether(d, &ptr, (void **)&ap, tleft, &etype);
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errno = 0; /* XXX */
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if (n == -1 || n < sizeof(struct ether_arp)) {
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#ifdef RARP_DEBUG
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if (debug)
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printf("bad len=%d\n", n);
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#endif
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free(ptr);
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return (-1);
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}
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if (etype != ETHERTYPE_REVARP) {
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#ifdef RARP_DEBUG
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if (debug)
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printf("bad type=0x%x\n", etype);
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#endif
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free(ptr);
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return (-1);
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}
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if (ap->arp_hrd != htons(ARPHRD_ETHER) ||
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ap->arp_pro != htons(ETHERTYPE_IP) ||
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ap->arp_hln != sizeof(ap->arp_sha) ||
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ap->arp_pln != sizeof(ap->arp_spa) )
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{
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#ifdef RARP_DEBUG
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if (debug)
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printf("bad hrd/pro/hln/pln\n");
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#endif
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free(ptr);
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return (-1);
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}
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if (ap->arp_op != htons(ARPOP_REVREPLY)) {
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#ifdef RARP_DEBUG
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if (debug)
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printf("bad op=0x%x\n", ntohs(ap->arp_op));
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#endif
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free(ptr);
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return (-1);
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}
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/* Is the reply for our Ethernet address? */
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if (bcmp(ap->arp_tha, d->myea, 6)) {
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#ifdef RARP_DEBUG
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if (debug)
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printf("unwanted address\n");
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#endif
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free(ptr);
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return (-1);
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}
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/* We have our answer. */
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#ifdef RARP_DEBUG
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if (debug)
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printf("got it\n");
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#endif
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*pkt = ptr;
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*payload = ap;
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return (n);
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}
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