/* Simple syslog proxy for Linux and FreeBSD
 *
 * (c) 2004 MadCamel - Public Domain, use at your own risk.
 * 
 * This program creates a log socket and proxies syslog messages to the real
 * log socket. Useful for chroot stuff.
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>

#ifdef __FreeBSD__
# define LOG_PATH "/var/run/log"
#endif
#ifdef __LINUX__
# define LOG_PATH "/dev/log"
#endif

int main(int argc, char **argv)
{
	struct sockaddr_un sa;
	int readsock, writesock, nread;
	char buf[8192];

	if (argc < 2) {
		printf("usage: %s <path>\n", argv[0]);
		exit(1);
	}

	memset(&buf, 0, sizeof(buf));

	/* Setup listen socket */
	if ((readsock = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
		perror("socket");
		exit(1);
	}

	sa.sun_family = AF_UNIX;

	if (snprintf(sa.sun_path, sizeof(sa.sun_path), "%s", argv[1]) < 0) {
		fprintf(stderr, "Socket name too long\n");
		exit(1);
	}

	unlink(sa.sun_path);

	if (bind(readsock, (struct sockaddr *)&sa, (socklen_t)sizeof(sa)) < 0) {
		perror("bind");
		exit(1);
	}

	/* Connect to log socket */

	if ((writesock = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0) {
		perror("socket");
		exit(1);
	}

	sa.sun_family = AF_UNIX;
	sprintf(sa.sun_path, "%s", LOG_PATH);

	if (connect(writesock, (struct sockaddr *)&sa, (socklen_t)sizeof(sa)) < 0) {
		perror("connect");
		exit(1);
	}

	daemon(0,0);

	/* Pass data */
	while ( ( nread = read(readsock, &buf, sizeof(buf)-2) ) > -1) {
		write(writesock, &buf, nread);
	}
}