inet/rexec.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)rexec.c     8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40
  41 #include <netinet/in.h>
  42
  43 #include <stdio.h>
  44 #include <netdb.h>
  45 #include <errno.h>
  46
  47 extern  errno;
  48 char    *index();
  49 int     rexecoptions;
  50 char    *getpass(), *getlogin();
  51
  52 rexec(ahost, rport, name, pass, cmd, fd2p)
  53         char **ahost;
  54         int rport;
  55         char *name, *pass, *cmd;
  56         int *fd2p;
  57 {
  58         struct sockaddr_in sin, sin2, from;
  59         struct hostent *hp;
  60         u_short port;
  61         int s, timo = 1, s3;
  62         char c;
  63
  64         hp = gethostbyname(*ahost);
  65         if (hp == 0) {
  66                 herror(*ahost);
  67                 return (-1);
  68         }
  69         *ahost = hp->h_name;
  70         ruserpass(hp->h_name, &name, &pass);
  71 retry:
  72         s = socket(AF_INET, SOCK_STREAM, 0);
  73         if (s < 0) {
  74                 perror("rexec: socket");
  75                 return (-1);
  76         }
  77         sin.sin_family = hp->h_addrtype;
  78         sin.sin_port = rport;
  79         bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
  80         if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
  81                 if (errno == ECONNREFUSED && timo <= 16) {
  82                         (void) close(s);
  83                         sleep(timo);
  84                         timo *= 2;
  85                         goto retry;
  86                 }
  87                 perror(hp->h_name);
  88                 return (-1);
  89         }
  90         if (fd2p == 0) {
  91                 (void) write(s, "", 1);
  92                 port = 0;
  93         } else {
  94                 char num[8];
  95                 int s2, sin2len;
  96
  97                 s2 = socket(AF_INET, SOCK_STREAM, 0);
  98                 if (s2 < 0) {
  99                         (void) close(s);
 100                         return (-1);
 101                 }
 102                 listen(s2, 1);
 103                 sin2len = sizeof (sin2);
 104                 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
 105                   sin2len != sizeof (sin2)) {
 106                         perror("getsockname");
 107                         (void) close(s2);
 108                         goto bad;
 109                 }
 110                 port = ntohs((u_short)sin2.sin_port);
 111                 (void) sprintf(num, "%u", port);
 112                 (void) write(s, num, strlen(num)+1);
 113                 { int len = sizeof (from);
 114                   s3 = accept(s2, (struct sockaddr *)&from, &len);
 115                   close(s2);
 116                   if (s3 < 0) {
 117                         perror("accept");
 118                         port = 0;
 119                         goto bad;
 120                   }
 121                 }
 122                 *fd2p = s3;
 123         }
 124         (void) write(s, name, strlen(name) + 1);
 125         /* should public key encypt the password here */
 126         (void) write(s, pass, strlen(pass) + 1);
 127         (void) write(s, cmd, strlen(cmd) + 1);
 128         if (read(s, &c, 1) != 1) {
 129                 perror(*ahost);
 130                 goto bad;
 131         }
 132         if (c != 0) {
 133                 while (read(s, &c, 1) == 1) {
 134                         (void) write(2, &c, 1);
 135                         if (c == '\n')
 136                                 break;
 137                 }
 138                 goto bad;
 139         }
 140         return (s);
 141 bad:
 142         if (port)
 143                 (void) close(*fd2p);
 144         (void) close(s);
 145         return (-1);
 146 }