BSD 4_4 release

[unix-history] / usr / src / lib / libcompat / 4.3 / rexec.c

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

#include <netinet/in.h>

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

extern  errno;
char    *index();
int     rexecoptions;
char    *getpass(), *getlogin();

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

       hp = gethostbyname(*ahost);
       if (hp == 0) {
               herror(*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, (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);
               }
               listen(s2, 1);
               sin2len = sizeof (sin2);
               if (getsockname(s2, (struct sockaddr *)&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, (struct sockaddr *)&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);
}