/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

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

#define MAXARGS 10

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

int
main(argc, argv)
        int argc;
        char *argv[];
{
        register char *sp;
        char line[512];
        struct sockaddr_storage sin;
        pid_t pid, w;
        int i, p[2], status;
        FILE *fp;
        char *av[MAXARGS + 1];

        i = sizeof (sin);
        if (getpeername(0, (struct sockaddr *)&sin, &i) < 0)
                fatal(argv[0], "getpeername");
        line[0] = '\0';
        if (fgets(line, sizeof (line), stdin) == NULL)
                exit(1);
        sp = line;
        av[0] = "finger";
        i = 1;

        /* skip past leading white space */
        while (isspace(*sp))
                sp++;

        /*
         * The finger protocol says a "/W" switch means verbose output.
         * We explicitly set either the "long" or "short" output flags
         * to the finger program so that we don't have to know what what
         * the "finger" program's default is.
         */
        if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
                sp += 2;
                av[i++] = "-l";
        } else {
                av[i++] = "-s";
        }

        /* look for username arguments */
        while (i < MAXARGS) {

                /* skip over leading white space */
                while (isspace(*sp))
                        sp++;

                /* check for end of "command line" */
                if (*sp == '\0')
                        break;

                /* pick up another name argument */
                av[i++] = sp;
                while ((*sp != '\0') && !isspace(*sp))
                        sp++;

                /* check again for end of "command line" */
                if (*sp == '\0')
                        break;
                else
                        *sp++ = '\0';
        }

        av[i] = (char *)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/bin/finger", av);
                printf("No local finger program found\n");
                fflush(stdout);
                _exit(1);
        }
        if (pid == (pid_t)-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 ((w = wait(&status)) != pid && w != (pid_t)-1)
                ;
        return (0);
}

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

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