GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/net/ethers.c Lines: 0 102 0.0 %
Date: 2017-11-13 Branches: 0 70 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: ethers.c,v 1.25 2016/09/21 04:38:56 guenther Exp $	*/
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/*
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 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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/*
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 * ethers(3) a la Sun.
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 * Originally Written by Roland McGrath <roland@frob.com> 10/14/93.
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 * Substantially modified by Todd C. Miller <Todd.Miller@courtesan.com>
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 */
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#include <sys/types.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 <paths.h>
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#include <errno.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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#include <ctype.h>
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#include <limits.h>
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#ifdef YP
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#include <rpcsvc/ypclnt.h>
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#endif
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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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static char * _ether_aton(const char *, struct ether_addr *);
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char *
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ether_ntoa(struct ether_addr *e)
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{
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	static char a[] = "xx:xx:xx:xx:xx:xx";
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	(void)snprintf(a, sizeof a, "%02x:%02x:%02x:%02x:%02x:%02x",
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	    e->ether_addr_octet[0], e->ether_addr_octet[1],
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	    e->ether_addr_octet[2], e->ether_addr_octet[3],
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	    e->ether_addr_octet[4], e->ether_addr_octet[5]);
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	return (a);
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}
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static char *
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_ether_aton(const char *s, struct ether_addr *e)
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{
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	int i;
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	long l;
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	char *pp;
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	while (isspace((unsigned char)*s))
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		s++;
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	/* expect 6 hex octets separated by ':' or space/NUL if last octet */
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	for (i = 0; i < 6; i++) {
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		l = strtol(s, &pp, 16);
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		if (pp == s || l > 0xFF || l < 0)
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			return (NULL);
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		if (!(*pp == ':' ||
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		    (i == 5 && (isspace((unsigned char)*pp) ||
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		    *pp == '\0'))))
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			return (NULL);
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		e->ether_addr_octet[i] = (u_char)l;
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		s = pp + 1;
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	}
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	/* return character after the octets ala strtol(3) */
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	return (pp);
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}
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struct ether_addr *
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ether_aton(const char *s)
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{
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	static struct ether_addr n;
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	return (_ether_aton(s, &n) ? &n : NULL);
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}
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int
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ether_ntohost(char *hostname, struct ether_addr *e)
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{
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	FILE *f;
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	char buf[BUFSIZ+1], *p;
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	size_t len;
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	struct ether_addr try;
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#ifdef YP
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	char trybuf[sizeof("xx:xx:xx:xx:xx:xx")];
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	int trylen;
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#endif
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#ifdef YP
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	snprintf(trybuf, sizeof trybuf, "%x:%x:%x:%x:%x:%x",
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	    e->ether_addr_octet[0], e->ether_addr_octet[1],
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	    e->ether_addr_octet[2], e->ether_addr_octet[3],
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	    e->ether_addr_octet[4], e->ether_addr_octet[5]);
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	trylen = strlen(trybuf);
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#endif
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	f = fopen(_PATH_ETHERS, "re");
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	if (f == NULL)
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		return (-1);
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	while ((p = fgetln(f, &len)) != NULL) {
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		if (p[len-1] == '\n')
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			len--;
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		if (len > sizeof(buf) - 2)
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			continue;
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		(void)memcpy(buf, p, len);
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		buf[len] = '\n';	/* code assumes newlines later on */
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		buf[len+1] = '\0';
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#ifdef YP
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		/* A + in the file means try YP now.  */
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		if (!strncmp(buf, "+\n", sizeof(buf))) {
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			char *ypbuf, *ypdom;
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			int ypbuflen;
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			if (yp_get_default_domain(&ypdom))
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				continue;
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			if (yp_match(ypdom, "ethers.byaddr", trybuf,
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			    trylen, &ypbuf, &ypbuflen))
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				continue;
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			if (ether_line(ypbuf, &try, hostname) == 0) {
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				free(ypbuf);
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				(void)fclose(f);
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				return (0);
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			}
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			free(ypbuf);
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			continue;
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		}
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#endif
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		if (ether_line(buf, &try, hostname) == 0 &&
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		    memcmp(&try, e, sizeof(try)) == 0) {
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			(void)fclose(f);
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			return (0);
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		}
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	}
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	(void)fclose(f);
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	errno = ENOENT;
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	return (-1);
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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 *f;
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	char buf[BUFSIZ+1], *p;
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	char try[HOST_NAME_MAX+1];
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	size_t len;
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#ifdef YP
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	int hostlen = strlen(hostname);
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#endif
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	f = fopen(_PATH_ETHERS, "re");
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	if (f==NULL)
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		return (-1);
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	while ((p = fgetln(f, &len)) != NULL) {
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		if (p[len-1] == '\n')
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			len--;
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		if (len > sizeof(buf) - 2)
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			continue;
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		memcpy(buf, p, len);
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		buf[len] = '\n';	/* code assumes newlines later on */
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		buf[len+1] = '\0';
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#ifdef YP
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		/* A + in the file means try YP now.  */
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		if (!strncmp(buf, "+\n", sizeof(buf))) {
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			char *ypbuf, *ypdom;
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			int ypbuflen;
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			if (yp_get_default_domain(&ypdom))
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				continue;
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			if (yp_match(ypdom, "ethers.byname", hostname, hostlen,
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			    &ypbuf, &ypbuflen))
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				continue;
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			if (ether_line(ypbuf, e, try) == 0) {
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				free(ypbuf);
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				(void)fclose(f);
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				return (0);
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			}
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			free(ypbuf);
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			continue;
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		}
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#endif
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		if (ether_line(buf, e, try) == 0 && strcmp(hostname, try) == 0) {
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			(void)fclose(f);
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			return (0);
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		}
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	}
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	(void)fclose(f);
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	errno = ENOENT;
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	return (-1);
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}
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int
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ether_line(const char *line, struct ether_addr *e, char *hostname)
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{
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	char *p;
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	size_t n;
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	/* Parse "xx:xx:xx:xx:xx:xx" */
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	if ((p = _ether_aton(line, e)) == NULL || (*p != ' ' && *p != '\t'))
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		goto bad;
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	/* Now get the hostname */
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	while (isspace((unsigned char)*p))
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		p++;
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	if (*p == '\0')
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		goto bad;
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	n = strcspn(p, " \t\n");
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	if (n >= HOST_NAME_MAX+1)
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		goto bad;
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	strlcpy(hostname, p, n + 1);
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	return (0);
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bad:
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	errno = EINVAL;
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	return (-1);
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}
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DEF_WEAK(ether_line);