Il CD di internet/CD.iso/SOURCE/N/TCPIP/NETKIT-B.05/NETKIT-B/NetKit-B-0.05/fingerd/fingerd.c

C/C++ Source or Header | 1994-06-17 | 4.3 KB | 168 lines

/*
 * 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[] = "from: @(#)fingerd.c    5.6 (Berkeley) 6/1/90";*/
static char rcsid[] = "$Id: fingerd.c,v 1.1 1994/05/23 09:03:33 rzsfl Exp rzsfl $";
#endif /* not lint */

#include <stdio.h>
#include "pathnames.h"
#include <pwd.h>
#include <syslog.h>
#include <sys/utsname.h>
#include <string.h>
#include <netdb.h>


main(argc, argv)
    int argc;
    char *argv[];
{
    extern int opterr, optind;
    struct passwd *pw;
    char *sp;
    register FILE *fp;
    register int ch, ca;
    register char *lp;
    int p[2];
#define    ENTRIES    50
    char **ap, *av[ENTRIES + 1], line[1024], *strtok();
    int welcome = 0;

    opterr = 0;
    while ((ca = getopt(argc, argv, "w")) != EOF)
        switch(ca) {
        case 'w':
            welcome = 1;
            break;
        case '?':
        default:
            syslog(LOG_ERR, "usage: fingerd [-w]");
            exit(1);
        }
    argc -= optind;
    argv += optind;

#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);

    if(welcome) {
        char myname[128];
        struct hostent *hp;
        struct utsname utsname;

        (void) uname(&utsname);
        gethostname(myname, sizeof(myname));
        if ((hp = gethostbyname(myname)))
            strcpy(myname, hp->h_name);
        printf("\r\nWelcome to %s version %s at %s !\r\n\n",
                utsname.sysname, utsname.release, myname);
        fflush(stdout);
        sprintf(myname, "%s -c %s", _PATH_SH, _PATH_UPTIME);
        system(myname);
        fflush(stdout);
        printf("\r\n");
        fflush(stdout);
    }

    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");

    if ((pw = getpwnam("nobody")) != NULL) {
        (void) setgid(pw->pw_gid);
        (void) setuid(pw->pw_uid);
    }

    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);
}