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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)rexec.c     8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36
  37 #include <netinet/in.h>
  38
  39 #include <alloca.h>
  40 #include <stdio.h>
  41 #include <netdb.h>
  42 #include <errno.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 int     rexecoptions;
  48 libc_freeres_ptr (static char *ahostbuf);
  49
  50 int
  51 rexec_af(ahost, rport, name, pass, cmd, fd2p, af)
  52         char **ahost;
  53         int rport;
  54         const char *name, *pass, *cmd;
  55         int *fd2p;
  56         sa_family_t af;
  57 {
  58         struct sockaddr_storage sa2, from;
  59         struct addrinfo hints, *res0;
  60         const char *orig_name = name;
  61         const char *orig_pass = pass;
  62         u_short port = 0;
  63         int s, timo = 1, s3;
  64         char c;
  65         int gai;
  66         char servbuff[NI_MAXSERV];
  67
  68         __snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));
  69         servbuff[sizeof(servbuff) - 1] = '\0';
  70
  71         memset(&hints, '\0', sizeof(hints));
  72         hints.ai_family = af;
  73         hints.ai_socktype = SOCK_STREAM;
  74         hints.ai_flags = AI_CANONNAME;
  75         gai = getaddrinfo(*ahost, servbuff, &hints, &res0);
  76         if (gai){
  77                 /* XXX: set errno? */
  78                 return -1;
  79         }
  80
  81         if (res0->ai_canonname){
  82                 free (ahostbuf);
  83                 ahostbuf = strdup (res0->ai_canonname);
  84                 if (ahostbuf == NULL) {
  85                         perror ("rexec: strdup");
  86                         return (-1);
  87                 }
  88                 *ahost = ahostbuf;
  89         } else
  90                 *ahost = NULL;
  91         ruserpass(res0->ai_canonname, &name, &pass);
  92 retry:
  93         s = __socket(res0->ai_family, res0->ai_socktype, 0);
  94         if (s < 0) {
  95                 perror("rexec: socket");
  96                 return (-1);
  97         }
  98         if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
  99                 if (errno == ECONNREFUSED && timo <= 16) {
 100                         (void) __close(s);
 101                         __sleep(timo);
 102                         timo *= 2;
 103                         goto retry;
 104                 }
 105                 perror(res0->ai_canonname);
 106                 return (-1);
 107         }
 108         if (fd2p == 0) {
 109                 (void) __write(s, "", 1);
 110                 port = 0;
 111         } else {
 112                 char num[32];
 113                 int s2, sa2len;
 114
 115                 s2 = __socket(res0->ai_family, res0->ai_socktype, 0);
 116                 if (s2 < 0) {
 117                         (void) __close(s);
 118                         return (-1);
 119                 }
 120                 __listen(s2, 1);
 121                 sa2len = sizeof (sa2);
 122                 if (__getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {
 123                         perror("getsockname");
 124                         (void) __close(s2);
 125                         goto bad;
 126                 } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {
 127                         __set_errno(EINVAL);
 128                         (void) __close(s2);
 129                         goto bad;
 130                 }
 131                 port = 0;
 132                 if (!getnameinfo((struct sockaddr *)&sa2, sa2len,
 133                                  NULL, 0, servbuff, sizeof(servbuff),
 134                                  NI_NUMERICSERV))
 135                         port = atoi(servbuff);
 136                 (void) sprintf(num, "%u", port);
 137                 (void) __write(s, num, strlen(num)+1);
 138                 { int len = sizeof (from);
 139                   s3 = accept(s2, (struct sockaddr *)&from, &len);
 140                   __close(s2);
 141                   if (s3 < 0) {
 142                         perror("accept");
 143                         port = 0;
 144                         goto bad;
 145                   }
 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
 154         /* We don't need the memory allocated for the name and the password
 155            in ruserpass anymore.  */
 156         if (name != orig_name)
 157           free ((char *) name);
 158         if (pass != orig_pass)
 159           free ((char *) pass);
 160
 161         if (__read(s, &c, 1) != 1) {
 162                 perror(*ahost);
 163                 goto bad;
 164         }
 165         if (c != 0) {
 166                 while (__read(s, &c, 1) == 1) {
 167                         (void) __write(2, &c, 1);
 168                         if (c == '\n')
 169                                 break;
 170                 }
 171                 goto bad;
 172         }
 173         freeaddrinfo(res0);
 174         return (s);
 175 bad:
 176         if (port)
 177                 (void) __close(*fd2p);
 178         (void) __close(s);
 179         freeaddrinfo(res0);
 180         return (-1);
 181 }
 182 libc_hidden_def (rexec_af)
 183
 184 int
 185 rexec(ahost, rport, name, pass, cmd, fd2p)
 186         char **ahost;
 187         int rport;
 188         const char *name, *pass, *cmd;
 189         int *fd2p;
 190 {
 191         return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
 192 }