/* $Id$ */

FIXME: Check and tidy it up first!


#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <netinet/in.h>
#include <string.h>


int main(int argc,char **argv)
{
int fdunix,fdtcp,fdtcplisten;
struct sockaddr_un sockaddr_unix;
struct sockaddr_in sockaddr_tcp;
const char *pathnameunix,*nametcp;
struct pollfd pollfds[2];
int fdi,fdo;
socklen_t sockaddr_tcp_len;
int setsockopt_SO_REUSEADDR_on;

	if (argc!=3) {
		fprintf(stderr,"%s: <pathname UNIX socket> <name TCP>\n",argv[0]);
		exit(EXIT_FAILURE);
		}
	pathnameunix=argv[1];
	nametcp=argv[2];

	if (-1==(fdunix=socket(PF_UNIX,SOCK_STREAM,0))) {
		fprintf(stderr,"socket(PF_UNIX,SOCK_STREAM,0)=%d: %m\n",fdunix);
		exit(EXIT_FAILURE);
		}
	memset(&sockaddr_unix,0,sizeof(sockaddr_unix));
	sockaddr_unix.sun_family=AF_UNIX;
	strncpy(sockaddr_unix.sun_path,pathnameunix,sizeof(sockaddr_unix.sun_path));
	if (connect(fdunix,(const struct sockaddr *)&sockaddr_unix,sizeof(sockaddr_unix))) {
		fprintf(stderr,"connect(UNIX socket,\"%s\"): %m\n",pathnameunix);
		exit(EXIT_FAILURE);
		}

	if (-1==(fdtcplisten=socket(PF_INET,SOCK_STREAM,0))) {
		fprintf(stderr,"socket(PF_INET,SOCK_STREAM,0)=%d: %m\n",fdtcplisten);
		exit(EXIT_FAILURE);
		}
	setsockopt_SO_REUSEADDR_on=1;
	if (setsockopt(fdtcplisten,SOL_SOCKET,SO_REUSEADDR,&setsockopt_SO_REUSEADDR_on,sizeof(setsockopt_SO_REUSEADDR_on))) {
		fprintf(stderr,"setsockopt(TCP socket,SOL_SOCKET,SO_REUSEADDR,&1,sizeof(1)): %m\n");
		exit(EXIT_FAILURE);
		}
	memset(&sockaddr_tcp,0,sizeof(sockaddr_tcp));
	sockaddr_tcp.sin_family=AF_INET;
	sockaddr_tcp.sin_addr.s_addr=htonl(INADDR_LOOPBACK);
	sockaddr_tcp.sin_port=htons(atoi(nametcp));
	if (bind(fdtcplisten,(const struct sockaddr *)&sockaddr_tcp,sizeof(sockaddr_tcp))) {
		fprintf(stderr,"bind(TCP socket,127.0.0.1:%s): %m\n",nametcp);
		exit(EXIT_FAILURE);
		}
	if (listen(fdtcplisten,1)) {
		fprintf(stderr,"listen(TCP socket,1): %m\n");
		exit(EXIT_FAILURE);
		}
	sockaddr_tcp_len=sizeof(sockaddr_tcp);
	fprintf(stderr,"accept... ");
	if (-1==(fdtcp=accept(fdtcplisten,(struct sockaddr *)&sockaddr_tcp,&sockaddr_tcp_len))) {
		fprintf(stderr,"accept(TCP socket): %m\n");
		exit(EXIT_FAILURE);
		}
	fprintf(stderr,"done\n");
	if (close(fdtcplisten)) {
		fprintf(stderr,"close(TCP listen socket): %m\n");
		exit(EXIT_FAILURE);
		}

	for (;;) {
		pollfds[0].fd=fdunix;
		pollfds[0].events=POLLIN;
		pollfds[1].fd=fdtcp;
		pollfds[1].events=POLLIN;
		if (0>=poll(pollfds,sizeof(pollfds)/sizeof(*pollfds),-1)) {
			fprintf(stderr,"poll(UNIX socket,PIPE socket): %m\n");
			exit(EXIT_FAILURE);
			}
		if (pollfds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) {
			fprintf(stderr,"poll(UNIX socket): revents=0x%X\n",(unsigned)pollfds[0].revents);
			exit(EXIT_FAILURE);
			}
		if (pollfds[1].revents & (POLLERR|POLLHUP|POLLNVAL)) {
			fprintf(stderr,"poll(PIPE socket): revents=0x%X\n",(unsigned)pollfds[1].revents);
			exit(EXIT_FAILURE);
			}
		for (fdi=0;fdi<sizeof(pollfds)/sizeof(*pollfds);fdi++) {
			for (;;) {
				ssize_t got;
				char buf[0x1000];

				if (fcntl(pollfds[fdi].fd,F_SETFL,O_NONBLOCK)) {
					fprintf(stderr,"fcntl(%s socket,F_SETFL,O_NONBLOCK): %m\n",
							(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
					exit(EXIT_FAILURE);
					}
				got=read(pollfds[fdi].fd,buf,sizeof(buf));
				if (got<0) {
					if (errno==EAGAIN)
						break;
					fprintf(stderr,"read(%s socket): %m\n",
							(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
					exit(EXIT_FAILURE);
					}
				if (got==0)
					exit(EXIT_SUCCESS);
				for (fdo=0;fdo<sizeof(pollfds)/sizeof(*pollfds);fdo++) {
					if (fdi==fdo)
						continue;
					if (fcntl(pollfds[fdo].fd,F_SETFL,0 /* !O_NONBLOCK */)) {
						fprintf(stderr,"fcntl(%s socket,F_SETFL,0 /* !O_NONBLOCK */): %m\n",
								(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
						exit(EXIT_FAILURE);
						}
					if (got!=write(pollfds[fdo].fd,buf,got)) {
						fprintf(stderr,"write(%s socket,%ld): %m\n",
								(fdo==0 ? "UNIX" : (fdo==1 ? "PIPE" : "<UNKNOWN>")),
								(long)got);
						exit(EXIT_FAILURE);
						}
					}
				}
			}
		}
	return EXIT_SUCCESS;
}