usr/src/libexec/fingerd/fingerd.c

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

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

#ifndef lint
static char sccsid[] = "@(#)fingerd.c   5.6 (Berkeley) 6/1/90";
#endif /* not lint */

#include <stdio.h>
#include "pathnames.h"

main()
{
        register FILE *fp;
        register int ch;
        register char *lp;
        int p[2];
#define ENTRIES 50
        char **ap, *av[ENTRIES + 1], line[1024], *strtok();

#ifdef LOGGING                                  /* unused for now */
#include <netinet/in.h>
        struct sockaddr_in sin;
        int sval;

        sval = sizeof(sin);
        if (getpeername(0, &sin, &sval) < 0)
                fatal("getpeername");
#endif

        if (!fgets(line, sizeof(line), stdin))
                exit(1);

        av[0] = "finger";
        for (lp = line, ap = &av[1];;) {
                *ap = strtok(lp, " \t\r\n");
                if (!*ap)
                        break;
                /* RFC742: "/[Ww]" == "-l" */
                if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w'))
                        *ap = "-l";
                if (++ap == av + ENTRIES)
                        break;
                lp = NULL;
        }

        if (pipe(p) < 0)
                fatal("pipe");

        switch(fork()) {
        case 0:
                (void)close(p[0]);
                if (p[1] != 1) {
                        (void)dup2(p[1], 1);
                        (void)close(p[1]);
                }
                execv(_PATH_FINGER, av);
                _exit(1);
        case -1:
                fatal("fork");
        }
        (void)close(p[1]);
        if (!(fp = fdopen(p[0], "r")))
                fatal("fdopen");
        while ((ch = getc(fp)) != EOF) {
                if (ch == '\n')
                        putchar('\r');
                putchar(ch);
        }
        exit(0);
}

fatal(msg)
        char *msg;
{
        extern int errno;
        char *strerror();

        fprintf(stderr, "fingerd: %s: %s\r\n", msg, strerror(errno));
        exit(1);
}