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sysloguread.c
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sysloguread.c
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/* sysloguread.c - UDP syslog reader.
* Copyright (C) 2005 Bruce Guenter <bruceg@em.ca>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include "setuidgid.h"
#include "sockaddr_in.h"
#include "syslogread.h"
void write_err(const char* str)
{
write(2, str, strlen(str));
}
void error(const char* msg)
{
write_err("sysloguread: Error: ");
write_err(msg);
write_err("\n");
}
void die(const char* msg)
{
error(msg);
exit(1);
}
void usage(const char* msg)
{
if(msg)
error(msg);
write_err("Usage: sysloguread [-g GID] [-u UID] [-U] IP PORT ...\n");
exit(1);
}
static int* sockets;
static char** socket_names;
static int num_sockets;
static gid_t opt_gid = 0;
static uid_t opt_uid = 0;
void parse_args(int argc, char* argv[])
{
int ch;
while((ch = getopt(argc, argv, "g:u:U")) != EOF) {
switch(ch) {
case 'g': opt_gid = parse_gid(optarg); break;
case 'u': opt_uid = parse_uid(optarg); break;
case 'U':
opt_gid = parse_gid(getenv("GID"));
opt_uid = parse_uid(getenv("UID"));
break;
default:
usage(0);
}
}
if((argc - optind) % 2)
usage("Missing port number");
num_sockets = (argc - optind) / 2;
if(num_sockets <= 0)
usage("You must specify at least one socket");
socket_names = argv + optind;
sockets = calloc(num_sockets, sizeof(int));
}
void make_sockets(void)
{
int i;
for(i = 0; i < num_sockets; i++) {
struct sockaddr_in sa;
if((sockets[i] = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
die("Could not create socket");
make_sockaddr_in(socket_names[i*2], socket_names[i*2+1], &sa);
if(bind(sockets[i], (struct sockaddr*)&sa, sizeof sa))
die("Could not bind socket to address");
}
setuidgid(opt_uid, opt_gid);
}
int main(int argc, char* argv[])
{
parse_args(argc, argv);
make_sockets();
main_loop(num_sockets, sockets);
return 0;
}