[The point, of course, is that this inetd substitute can be run as a
non-root user.

If you are having trouble getting this to work, you'll presumably want
to improve the error handling (so it writes a log file or something).

This wheel has been reinvented in various ways; here are some pointers
from Kragen Sittler:

    I run cvs pserver from tcpserver, which is essentially the same as a
    one-daemon inetd (with a few extra features, like a limit on the number of
    simultaneous connections).

    See <URL:http://pobox.com/~djb/ucspi-tcp.html> for more.  It lists several
    other programs that do similar stuff: xinetd, faucet from netpipes
    <URL:http://web.purplefrog.com/~thoth/netpipes/netpipes.html>,
    socket <URL:http://www.freebsd.org/cgi/pds.cgi?ports/sysutils/socket>,
    and netcat (URL unknown).

-kingdon]

Date: Wed, 16 Dec 1998 11:01:13 +0100
From: Patrick Debois <Patrick.Debois@lin.vlaanderen.be>
To: bug-cvs@gnu.org
Subject: [Fwd: Contribution:Basic Inetd substitute]
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Jim Kingdon wrote:

> > because my ISP won't let me mess with his inetd.conf,i wrote some inetd
> > substitute. It is far from perfect but does the job for me.
>
> Please send such items to bug-cvs@gnu.org.  Note that submissions to
> bug-cvs may be distributed under the terms of the GNU Public License,
> so if you don't like this, don't submit them.




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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define SERV_TCP_PORT	2401
#define SERV_HOST_ADDR	"192.41.12.111"

char *pname;

main(argc, argv, envp)
int argc;
char *argv[];
char **envp;
{
	int sockfd, newsockfd, clilen,childpid;
	struct sockaddr_in cli_addr, serv_addr;

	pname = argv [0];
	
	if ((sockfd = socket (AF_INET,SOCK_STREAM,0)) <0)
	{
		printf("error: can't open stream socket");
		exit(0);
	}

	bzero((char *) &serv_addr, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	serv_addr.sin_port = htons(SERV_TCP_PORT);

	if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
	{
		printf("error: can't bind local address");
		exit(0);
	}
	
	listen (sockfd, 5);

	for ( ; ; ) {
		clilen = sizeof(cli_addr);
		newsockfd = accept(sockfd, (struct sockaddr * )  &cli_addr,&clilen);
		if (newsockfd < 0)
		{
			printf("error: accept error");
			exit(0);
		}
		if ((childpid = fork()) < 0)
		{
			close(sockfd);
			printf("error: fork error");
			exit(0);
		}
		else if (childpid == 0) {
			close (sockfd);
			close(0);
			close(1);
			close(2);
			dup(newsockfd);
			dup(newsockfd);
			dup(newsockfd);
			(void) execlp ("/usr/home/jedi/usr/local/bin/cvs","cvs","--allow-root=/usr/home/jedi/cvs","pserver",NULL);
			close (newsockfd);
			exit(0);
		}
		close (newsockfd);
	}
}

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