Serving the Web/ServingTheWeb1995.disc1of1.iso/linux/slacksrce/d/libc/libc-4.6/libc-4/libc-linux/inet/rexec.c

C/C++ Source or Header | 1994-10-14 | 4.6 KB | 172 lines

/*
 * Copyright (c) 1980, 1993
 *    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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rexec.c    8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include "inetprivate.h"

#if NLS
#include "nl_types.h"
#endif

int    rexecoptions;

int
rexec(ahost, rport, name, pass, cmd, fd2p)
    char **ahost;
    int rport;
    const char *name, *pass, *cmd;
    int *fd2p;
{
    int s, timo = 1, s3;
    struct sockaddr_in sin, sin2, from;
    char c;
    u_short port;
    struct hostent *hp;

#if NLS
    libc_nls_init();
#endif
    hp = gethostbyname(*ahost);
    if (hp == 0) {
#if NLS
        fprintf(stderr, "%s: %s\n", *ahost,
                              catgets(_libc_cat, HerrorListSet,
                      2, "unknown host"));
#else
        fprintf(stderr, "%s: unknown host\n", *ahost);
#endif
        return (-1);
    }
    *ahost = hp->h_name;
    ruserpass(hp->h_name, &name, &pass);
retry:
    s = socket(AF_INET, SOCK_STREAM, 0);
    if (s < 0) {
#if NLS
        perror(catgets(_libc_cat, NetMiscSet,
                   NetMiscRexecSocket,
                   "rcmd: socket"));
#else
        perror("rexec: socket");
#endif
        return (-1);
    }
    sin.sin_family = hp->h_addrtype;
    sin.sin_port = rport;
    bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
    if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
        if (errno == ECONNREFUSED && timo <= 16) {
            (void) close(s);
            sleep(timo);
            timo *= 2;
            goto retry;
        }
        perror(hp->h_name);
        return (-1);
    }
    if (fd2p == 0) {
        (void) write(s, "", 1);
        port = 0;
    } else {
        char num[8];
        int s2, sin2len;

        s2 = socket(AF_INET, SOCK_STREAM, 0);
        if (s2 < 0) {
            (void) close(s);
            return (-1);
        }
        sin2len = sizeof (sin2);
        sin2.sin_addr.s_addr = INADDR_ANY;
        sin2.sin_family = sin.sin_family;
        bind(s2, &sin2, sin2len);
        listen(s2, 1);
        if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
          sin2len != sizeof (sin2)) {
#if NLS
            perror(catgets(_libc_cat, NetMiscSet,
                       NetMiscGetsockname,
                       "getsockname"));
#else
            perror("getsockname");
#endif
            (void) close(s2);
            goto bad;
        }
        port = ntohs((u_short)sin2.sin_port);
        (void) sprintf(num, "%u", port);
        (void) write(s, num, strlen(num)+1);
        { int len = sizeof (from);
          s3 = accept(s2, (struct sockaddr *)&from, &len);
          close(s2);
          if (s3 < 0) {
#if NLS
            perror(catgets(_libc_cat, NetMiscSet,
                       NetMiscAccept,
                       "accept"));
#else
            perror("accept");
#endif
            port = 0;
            goto bad;
          }
        }
        *fd2p = s3;
    }
    (void) write(s, name, strlen(name) + 1);
    /* should public key encypt the password here */
    (void) write(s, pass, strlen(pass) + 1);
    (void) write(s, cmd, strlen(cmd) + 1);
    if (read(s, &c, 1) != 1) {
        perror(*ahost);
        goto bad;
    }
    if (c != 0) {
        while (read(s, &c, 1) == 1) {
            (void) write(2, &c, 1);
            if (c == '\n')
                break;
        }
        goto bad;
    }
    return (s);
bad:
    if (port)
        (void) close(*fd2p);
    (void) close(s);
    return (-1);
}