4.3BSD/usr/src/etc/fingerd.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)fingerd.c	5.1 (Berkeley) 6/6/85";
#endif not lint

/*
 * Finger server.
 */
#include <sys/types.h>
#include <netinet/in.h>

#include <stdio.h>
#include <ctype.h>

main(argc, argv)
	char *argv[];
{
	register char *sp;
	char line[512];
	struct sockaddr_in sin;
	int i, p[2], pid, status;
	FILE *fp;
	char *av[4];

	i = sizeof (sin);
	if (getpeername(0, &sin, &i) < 0)
		fatal(argv[0], "getpeername");
	line[0] = '\0';
	gets(line);
	sp = line;
	av[0] = "finger";
	i = 1;
	while (1) {
		while (isspace(*sp))
			sp++;
		if (!*sp)
			break;
		if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
			sp += 2;
			av[i++] = "-l";
		}
		if (*sp && !isspace(*sp)) {
			av[i++] = sp;
			while (*sp && !isspace(*sp))
				sp++;
			*sp = '\0';
		}
	}
	av[i] = 0;
	if (pipe(p) < 0)
		fatal(argv[0], "pipe");
	if ((pid = fork()) == 0) {
		close(p[0]);
		if (p[1] != 1) {
			dup2(p[1], 1);
			close(p[1]);
		}
		execv("/usr/ucb/finger", av);
		_exit(1);
	}
	if (pid == -1)
		fatal(argv[0], "fork");
	close(p[1]);
	if ((fp = fdopen(p[0], "r")) == NULL)
		fatal(argv[0], "fdopen");
	while ((i = getc(fp)) != EOF) {
		if (i == '\n')
			putchar('\r');
		putchar(i);
	}
	fclose(fp);
	while ((i = wait(&status)) != pid && i != -1)
		;
	return(0);
}

fatal(prog, s)
	char *prog, *s;
{

	fprintf(stderr, "%s: ", prog);
	perror(s);
	exit(1);
}