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 char    ahostbuf[NI_MAXHOST];
  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", 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                 strncpy(ahostbuf, res0->ai_canonname, sizeof(ahostbuf));
  83                 ahostbuf[sizeof(ahostbuf)-1] = '\0';
  84                 *ahost = ahostbuf;
  85         }
  86         else{
  87                 *ahost = NULL;
  88         }
  89         ruserpass(res0->ai_canonname, &name, &pass);
  90 retry:
  91         s = __socket(res0->ai_family, res0->ai_socktype, 0);
  92         if (s < 0) {
  93                 perror("rexec: socket");
  94                 return (-1);
  95         }
  96         if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
  97                 if (errno == ECONNREFUSED && timo <= 16) {
  98                         (void) __close(s);
  99                         __sleep(timo);
 100                         timo *= 2;
 101                         goto retry;
 102                 }
 103                 perror(res0->ai_canonname);
 104                 return (-1);
 105         }
 106         if (fd2p == 0) {
 107                 (void) __write(s, "", 1);
 108                 port = 0;
 109         } else {
 110                 char num[32];
 111                 int s2, sa2len;
 112
 113                 s2 = __socket(res0->ai_family, res0->ai_socktype, 0);
 114                 if (s2 < 0) {
 115                         (void) __close(s);
 116                         return (-1);
 117                 }
 118                 listen(s2, 1);
 119                 sa2len = sizeof (sa2);
 120                 if (getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0 ||
 121                     sa2len != SA_LEN((struct sockaddr *)&sa2)) {
 122                         perror("getsockname");
 123                         (void) __close(s2);
 124                         goto bad;
 125                 }
 126                 port = 0;
 127                 if (!getnameinfo((struct sockaddr *)&sa2, sa2len,
 128                                  NULL, 0, servbuff, sizeof(servbuff),
 129                                  NI_NUMERICSERV))
 130                         port = atoi(servbuff);
 131                 (void) sprintf(num, "%u", port);
 132                 (void) __write(s, num, strlen(num)+1);
 133                 { int len = sizeof (from);
 134                   s3 = accept(s2, (struct sockaddr *)&from, &len);
 135                   __close(s2);
 136                   if (s3 < 0) {
 137                         perror("accept");
 138                         port = 0;
 139                         goto bad;
 140                   }
 141                 }
 142                 *fd2p = s3;
 143         }
 144         (void) __write(s, name, strlen(name) + 1);
 145         /* should public key encypt the password here */
 146         (void) __write(s, pass, strlen(pass) + 1);
 147         (void) __write(s, cmd, strlen(cmd) + 1);
 148
 149         /* We don't need the memory allocated for the name and the password
 150            in ruserpass anymore.  */
 151         if (name != orig_name)
 152           free ((char *) name);
 153         if (pass != orig_pass)
 154           free ((char *) pass);
 155
 156         if (__read(s, &c, 1) != 1) {
 157                 perror(*ahost);
 158                 goto bad;
 159         }
 160         if (c != 0) {
 161                 while (__read(s, &c, 1) == 1) {
 162                         (void) __write(2, &c, 1);
 163                         if (c == '\n')
 164                                 break;
 165                 }
 166                 goto bad;
 167         }
 168         freeaddrinfo(res0);
 169         return (s);
 170 bad:
 171         if (port)
 172                 (void) __close(*fd2p);
 173         (void) __close(s);
 174         freeaddrinfo(res0);
 175         return (-1);
 176 }
 177
 178 int
 179 rexec(ahost, rport, name, pass, cmd, fd2p)
 180         char **ahost;
 181         int rport;
 182         const char *name, *pass, *cmd;
 183         int *fd2p;
 184 {
 185         return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
 186 }