libc/net/rexec.c

/*
 * 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 1989 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <stdio.h>
#include <netdb.h>
#include <errno.h>
#include <strings.h>
#include <unistd.h>


char    *getpass();

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

    hp = gethostbyname(*ahost);
    if (hp == 0) {
        fprintf(stderr, "%s: unknown host\n", *ahost);
        return (-1);
    }
    *ahost = hp->h_name;
    _ruserpass(hp->h_name, &name, &pass);
retry:
    s = socket(AF_INET, SOCK_STREAM, 0);
    if (s < 0) {
        perror("rexec: socket");
        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, &sin, sizeof(sin)) < 0) {
        if (errno == ECONNREFUSED && timo <= 16) {
            (void) close(s);
            sleep(timo);
            timo *= 2;
            goto retry;
        }
        perror(hp->h_name);
        (void) close(s);
        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);
        }
        listen(s2, 1);
        sin2len = sizeof (sin2);
        if (getsockname(s2, (char *)&sin2, &sin2len) < 0 ||
          sin2len != sizeof (sin2)) {
            perror("getsockname");
            (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, &from, &len);
          close(s2);
          if (s3 < 0) {
            perror("accept");
            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);
}