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283 lines
6.3 KiB
C
283 lines
6.3 KiB
C
/* $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr 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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* 4. 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: net.c,v 1.9 93/08/06 19:32:15 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 <string.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 <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include "stand.h"
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#include "net.h"
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/*
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* Send a packet and wait for a reply, with exponential backoff.
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*
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* The send routine must return the actual number of bytes written,
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* or -1 on error.
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*
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* The receive routine can indicate success by returning the number of
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* bytes read; it can return 0 to indicate EOF; it can return -1 with a
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* non-zero errno to indicate failure; finally, it can return -1 with a
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* zero errno to indicate it isn't done yet.
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*/
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ssize_t
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sendrecv(struct iodesc *d,
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ssize_t (*sproc)(struct iodesc *, void *, size_t),
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void *sbuf, size_t ssize,
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ssize_t (*rproc)(struct iodesc *, void *, size_t, time_t),
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void *rbuf, size_t rsize)
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{
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ssize_t cc;
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time_t t, tmo, tlast;
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long tleft;
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#ifdef NET_DEBUG
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if (debug)
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printf("sendrecv: called\n");
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#endif
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tmo = MINTMO;
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tlast = 0;
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tleft = 0;
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t = getsecs();
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for (;;) {
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if (tleft <= 0) {
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if (tmo >= MAXTMO) {
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errno = ETIMEDOUT;
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return -1;
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}
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cc = (*sproc)(d, sbuf, ssize);
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if (cc != -1 && cc < ssize)
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panic("sendrecv: short write! (%zd < %zd)",
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cc, ssize);
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tleft = tmo;
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tmo <<= 1;
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if (tmo > MAXTMO)
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tmo = MAXTMO;
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if (cc == -1) {
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/* Error on transmit; wait before retrying */
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while ((getsecs() - t) < tmo)
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;
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tleft = 0;
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continue;
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}
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tlast = t;
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}
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/* Try to get a packet and process it. */
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cc = (*rproc)(d, rbuf, rsize, tleft);
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/* Return on data, EOF or real error. */
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if (cc != -1 || errno != 0)
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return (cc);
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/* Timed out or didn't get the packet we're waiting for */
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t = getsecs();
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tleft -= t - tlast;
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tlast = t;
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}
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}
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/*
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* Like inet_addr() in the C library, but we only accept base-10.
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* Return values are in network order.
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*/
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n_long
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inet_addr(char *cp)
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{
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u_long val;
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int n;
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char c;
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u_int parts[4];
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u_int *pp = parts;
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for (;;) {
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/*
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, other=decimal.
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*/
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val = 0;
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while ((c = *cp) != '\0') {
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if (c >= '0' && c <= '9') {
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val = (val * 10) + (c - '0');
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cp++;
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continue;
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}
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break;
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}
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if (*cp == '.') {
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/*
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* Internet format:
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* a.b.c.d
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* a.b.c (with c treated as 16-bits)
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* a.b (with b treated as 24 bits)
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*/
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if (pp >= parts + 3 || val > 0xff)
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goto bad;
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*pp++ = val, cp++;
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} else
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break;
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}
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/*
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* Check for trailing characters.
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*/
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if (*cp != '\0')
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goto bad;
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/*
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* Concoct the address according to
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* the number of parts specified.
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*/
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n = pp - parts + 1;
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switch (n) {
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case 1: /* a -- 32 bits */
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break;
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case 2: /* a.b -- 8.24 bits */
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if (val > 0xffffff)
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goto bad;
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val |= parts[0] << 24;
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break;
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case 3: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff)
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goto bad;
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff)
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goto bad;
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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}
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return (htonl(val));
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bad:
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return (htonl(INADDR_NONE));
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}
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char *
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inet_ntoa(struct in_addr ia)
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{
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return (intoa(ia.s_addr));
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}
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/* Similar to inet_ntoa() */
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char *
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intoa(n_long addr)
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{
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char *cp;
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u_int byte;
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int n;
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static char buf[17]; /* strlen(".255.255.255.255") + 1 */
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addr = ntohl(addr);
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cp = &buf[sizeof buf];
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*--cp = '\0';
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n = 4;
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do {
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byte = addr & 0xff;
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*--cp = byte % 10 + '0';
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byte /= 10;
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if (byte > 0) {
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*--cp = byte % 10 + '0';
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byte /= 10;
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if (byte > 0)
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*--cp = byte + '0';
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}
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*--cp = '.';
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addr >>= 8;
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} while (--n > 0);
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return (cp+1);
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}
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static char *
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number(char *s, int *n)
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{
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for (*n = 0; isdigit(*s); s++)
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*n = (*n * 10) + *s - '0';
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return s;
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}
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n_long
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ip_convertaddr(char *p)
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{
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#define IP_ANYADDR 0
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n_long addr = 0, n;
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if (p == (char *)0 || *p == '\0')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 24) & 0xff000000;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 16) & 0xff0000;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= (n << 8) & 0xff00;
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if (*p == '\0' || *p++ != '.')
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return IP_ANYADDR;
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p = number(p, &n);
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addr |= n & 0xff;
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if (*p != '\0')
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return IP_ANYADDR;
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return htonl(addr);
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}
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