lib/libcompat/4.3/rexec.c

   1 /*      $NetBSD: rexec.c,v 1.15 2002/11/11 23:43:03 thorpej Exp $       */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)rexec.c     8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: rexec.c,v 1.15 2002/11/11 23:43:03 thorpej Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/types.h>
  42 #include <sys/socket.h>
  43
  44 #include <netinet/in.h>
  45
  46 #include <assert.h>
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <netdb.h>
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 int     rexecoptions;
  55
  56 int     ruserpass __P((const char *, char **, char **));
  57 int     rexec __P((char **, int, char *, char *, char *, int *));
  58
  59 int
  60 rexec(ahost, rport, name, pass, cmd, fd2p)
  61         char **ahost;
  62         int rport;
  63         char *name, *pass, *cmd;
  64         int *fd2p;
  65 {
  66         struct sockaddr_in rsin, from;
  67         socklen_t fromlen;
  68         struct hostent *hp;
  69         u_short port;
  70         size_t len;
  71         unsigned int timo = 1;
  72         int s, s3;
  73         char c;
  74
  75         _DIAGASSERT(ahost != NULL);
  76         _DIAGASSERT(name != NULL);
  77         _DIAGASSERT(pass != NULL);
  78         _DIAGASSERT(cmd != NULL);
  79         /* fd2p may be NULL */
  80
  81         hp = gethostbyname(*ahost);
  82         if (hp == 0) {
  83                 warnx("Error resolving %s (%s)", *ahost, hstrerror(h_errno));
  84                 return -1;
  85         }
  86         *ahost = hp->h_name;
  87         (void)ruserpass(hp->h_name, &name, &pass);
  88 retry:
  89         if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
  90                 warn("Cannot create socket");
  91                 return (-1);
  92         }
  93         rsin.sin_family = hp->h_addrtype;
  94         rsin.sin_len = sizeof(rsin);
  95         rsin.sin_port = rport;
  96         /* Avoid data corruption from bogus DNS results */
  97         if (hp->h_length > (int) sizeof(rsin.sin_addr))
  98                 len = sizeof(rsin.sin_addr);
  99         else
 100                 len = hp->h_length;
 101         memcpy(&rsin.sin_addr, hp->h_addr, len);
 102         if (connect(s, (struct sockaddr *)(void *)&rsin, sizeof(rsin)) == -1) {
 103                 if (errno == ECONNREFUSED && timo <= 16) {
 104                         (void)close(s);
 105                         sleep(timo);
 106                         timo *= 2;
 107                         goto retry;
 108                 }
 109                 warn("Cannot connect to %s", hp->h_name);
 110                 return -1;
 111         }
 112         port = 0;
 113         if (fd2p == 0) {
 114                 (void)write(s, "", 1);
 115         } else {
 116                 char num[8];
 117                 int s2;
 118                 struct sockaddr_in sin2;
 119                 socklen_t sin2len;
 120
 121                 s2 = socket(AF_INET, SOCK_STREAM, 0);
 122                 if (s2 == -1) {
 123                         warn("Error creating socket");
 124                         (void)close(s);
 125                         return -1;
 126                 }
 127                 listen(s2, 1);
 128                 sin2len = sizeof(sin2);
 129                 if (getsockname(s2, (struct sockaddr *)(void *)&sin2,
 130                     &sin2len) == -1 || sin2len != sizeof(sin2)) {
 131                         warn("Failed to get socket name");
 132                         (void)close(s2);
 133                         goto bad;
 134                 }
 135                 port = ntohs((u_short)sin2.sin_port);
 136                 (void)snprintf(num, sizeof(num), "%u", port);
 137                 (void)write(s, num, strlen(num)+1);
 138
 139                 fromlen = sizeof(from);
 140                 s3 = accept(s2, (struct sockaddr *)(void *)&from, &fromlen);
 141                 (void)close(s2);
 142                 if (s3 == -1) {
 143                         warn("Error accepting connection");
 144                         port = 0;
 145                         goto bad;
 146                 }
 147                 *fd2p = s3;
 148         }
 149         (void)write(s, name, strlen(name) + 1);
 150         /* should public key encypt the password here */
 151         (void)write(s, pass, strlen(pass) + 1);
 152         (void)write(s, cmd, strlen(cmd) + 1);
 153         if (read(s, &c, 1) != 1) {
 154                 warn("Error reading from %s", *ahost);
 155                 goto bad;
 156         }
 157         if (c != 0) {
 158                 while (read(s, &c, 1) == 1) {
 159                         (void) write(2, &c, 1);
 160                         if (c == '\n')
 161                                 break;
 162                 }
 163                 goto bad;
 164         }
 165         return s;
 166 bad:
 167         if (port)
 168                 (void)close(*fd2p);
 169         (void)close(s);
 170         return -1;
 171 }