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/* $OpenBSD: stdhosts.c,v 1.16 2009/10/27 23:59:58 deraadt Exp $ */
/*
* Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <err.h>
static int
read_line(FILE *fp, char *buf, int size)
{
int done = 0;
do {
while (fgets(buf, size, fp)) {
int len = strlen(buf);
done += len;
if (len > 1 && buf[len-2] == '\\' &&
buf[len-1] == '\n') {
int ch;
buf += len - 2;
size -= len - 2;
*buf = '\n';
buf[1] = '\0';
/*
* Skip leading white space on next line
*/
while ((ch = getc(fp)) != EOF &&
isascii(ch) && isspace(ch))
;
(void) ungetc(ch, fp);
} else
return done;
}
} while (size > 0 && !feof(fp));
return done;
}
int
main(int argc, char *argv[])
{
char data_line[1024], *p, *k, *v;
int line_no = 0, len;
struct in_addr host_addr;
FILE *data_file;
if (argc > 2) {
fprintf(stderr, "usage: stdhosts [file]\n");
exit(1);
}
if (argc == 2) {
if ((data_file = fopen(argv[argc-1], "r")) == NULL)
err(1, "error opening %s", argv[argc-1]);
} else
data_file = stdin;
while (read_line(data_file, data_line, sizeof(data_line))) {
line_no++;
len = strlen(data_line);
if (len > 0) {
if (data_line[0] == '#')
continue;
}
/*
* Check if we have the whole line
*/
if (data_line[len-1] != '\n') {
if (argc == 2)
fprintf(stderr,
"line %d in \"%s\" is too long",
line_no, argv[1]);
else
fprintf(stderr,
"line %d in \"stdin\" is too long", line_no);
} else
data_line[len-1] = '\0';
p = (char *) &data_line;
k = p; /* save start of key */
while (!isspace(*p)) /* find first "space" */
p++;
while (isspace(*p)) /* replace space with <NUL> */
*p++ = '\0';
v = p; /* save start of value */
while (*p != '\0') /* find end of string */
p++;
if (inet_aton(k, &host_addr))
printf("%s %s\n", inet_ntoa(host_addr), v);
}
return(0);
}
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