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76a1f42f3f
The previous code failed to return an error condition when the whole input was invalid due to improper handling of the sscanf return value. Actually, this failure was properly being caught by a test in tools/regression/lib/libc/net/test-ether.t but was not noticed because these tests are never run. (On my way to fixing that ;-) The fix applied here resembles the implementation of ether_line in NetBSD modulo the setting of an errno value (which is not documented as an expectation in the manpage anyway).
233 lines
5.7 KiB
C
233 lines
5.7 KiB
C
/*
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* Copyright (c) 1995 Bill Paul <wpaul@ctr.columbia.edu>.
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* Copyright (c) 2007 Robert N. M. Watson
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* All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bill Paul.
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* 4. Neither the name of the author nor the names of any co-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 Bill Paul 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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* ethernet address conversion and lookup routines
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*
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* Written by Bill Paul <wpaul@ctr.columbia.edu>
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* Center for Telecommunications Research
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* Columbia University, New York City
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <net/ethernet.h>
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef _PATH_ETHERS
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#define _PATH_ETHERS "/etc/ethers"
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#endif
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/*
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* Parse a string of text containing an ethernet address and hostname and
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* separate it into its component parts.
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*/
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int
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ether_line(const char *l, struct ether_addr *e, char *hostname)
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{
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int i, o[6];
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i = sscanf(l, "%x:%x:%x:%x:%x:%x %s", &o[0], &o[1], &o[2], &o[3],
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&o[4], &o[5], hostname);
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if (i == 7) {
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for (i = 0; i < 6; i++)
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e->octet[i] = o[i];
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return (0);
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} else {
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return (-1);
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}
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}
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/*
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* Convert an ASCII representation of an ethernet address to binary form.
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*/
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struct ether_addr *
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ether_aton_r(const char *a, struct ether_addr *e)
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{
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int i;
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unsigned int o0, o1, o2, o3, o4, o5;
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i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o0, &o1, &o2, &o3, &o4, &o5);
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if (i != 6)
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return (NULL);
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e->octet[0]=o0;
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e->octet[1]=o1;
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e->octet[2]=o2;
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e->octet[3]=o3;
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e->octet[4]=o4;
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e->octet[5]=o5;
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return (e);
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}
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struct ether_addr *
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ether_aton(const char *a)
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{
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static struct ether_addr e;
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return (ether_aton_r(a, &e));
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}
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/*
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* Convert a binary representation of an ethernet address to an ASCII string.
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*/
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char *
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ether_ntoa_r(const struct ether_addr *n, char *a)
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{
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int i;
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i = sprintf(a, "%02x:%02x:%02x:%02x:%02x:%02x", n->octet[0],
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n->octet[1], n->octet[2], n->octet[3], n->octet[4], n->octet[5]);
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if (i < 17)
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return (NULL);
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return (a);
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}
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char *
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ether_ntoa(const struct ether_addr *n)
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{
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static char a[18];
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return (ether_ntoa_r(n, a));
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}
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/*
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* Map an ethernet address to a hostname. Use either /etc/ethers or NIS/YP.
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*/
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int
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ether_ntohost(char *hostname, const struct ether_addr *e)
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{
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FILE *fp;
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char buf[BUFSIZ + 2];
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struct ether_addr local_ether;
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char local_host[MAXHOSTNAMELEN];
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#ifdef YP
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char *result;
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int resultlen;
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char *ether_a;
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char *yp_domain;
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#endif
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if ((fp = fopen(_PATH_ETHERS, "re")) == NULL)
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return (1);
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while (fgets(buf,BUFSIZ,fp)) {
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if (buf[0] == '#')
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continue;
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#ifdef YP
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if (buf[0] == '+') {
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if (yp_get_default_domain(&yp_domain))
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continue;
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ether_a = ether_ntoa(e);
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if (yp_match(yp_domain, "ethers.byaddr", ether_a,
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strlen(ether_a), &result, &resultlen)) {
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continue;
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}
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strncpy(buf, result, resultlen);
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buf[resultlen] = '\0';
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free(result);
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}
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#endif
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if (!ether_line(buf, &local_ether, local_host)) {
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if (!bcmp((char *)&local_ether.octet[0],
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(char *)&e->octet[0], 6)) {
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/* We have a match. */
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strcpy(hostname, local_host);
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fclose(fp);
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return(0);
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}
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}
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}
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fclose(fp);
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return (1);
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}
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/*
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* Map a hostname to an ethernet address using /etc/ethers or NIS/YP.
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*/
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int
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ether_hostton(const char *hostname, struct ether_addr *e)
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{
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FILE *fp;
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char buf[BUFSIZ + 2];
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struct ether_addr local_ether;
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char local_host[MAXHOSTNAMELEN];
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#ifdef YP
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char *result;
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int resultlen;
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char *yp_domain;
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#endif
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if ((fp = fopen(_PATH_ETHERS, "re")) == NULL)
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return (1);
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while (fgets(buf,BUFSIZ,fp)) {
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if (buf[0] == '#')
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continue;
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#ifdef YP
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if (buf[0] == '+') {
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if (yp_get_default_domain(&yp_domain))
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continue;
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if (yp_match(yp_domain, "ethers.byname", hostname,
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strlen(hostname), &result, &resultlen)) {
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continue;
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}
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strncpy(buf, result, resultlen);
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buf[resultlen] = '\0';
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free(result);
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}
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#endif
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if (!ether_line(buf, &local_ether, local_host)) {
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if (!strcmp(hostname, local_host)) {
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/* We have a match. */
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bcopy((char *)&local_ether.octet[0],
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(char *)&e->octet[0], 6);
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fclose(fp);
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return(0);
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}
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}
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}
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fclose(fp);
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return (1);
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}
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