remote-cstms.c

   1 /* GNU Make remote job exportation interface to the Customs daemon.
   2    THIS CODE IS NOT SUPPORTED BY THE GNU PROJECT.
   3    Please do not send bug reports or questions about it to
   4    the Make maintainers.
   5
   6 Copyright (C) 1988, 1989, 1992, 1993 Free Software Foundation, Inc.
   7 This file is part of GNU Make.
   8
   9 GNU Make is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU Make is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Make; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23 #include "make.h"
  24 #include "commands.h"
  25 #include "job.h"
  26 #include <sys/time.h>
  27 #include <netdb.h>
  28
  29 #define __STRICT_BSD__          /* Don't make conflicting declarations.  */
  30 #include "customs.h"
  31
  32
  33 char *remote_description = "Customs";
  34
  35 /* File name of the Customs `export' client command.
  36    A full path name can be used to avoid some path-searching overhead.  */
  37 #define EXPORT_COMMAND  "/usr/local/bin/export"
  38
  39 /* ExportPermit gotten by start_remote_job_p, and used by start_remote_job.  */
  40 static ExportPermit permit;
  41
  42 /* Normalized path name of the current directory.  */
  43 static char *normalized_cwd;
  44
  45 /* Return nonzero if the next job should be done remotely.  */
  46
  47 int
  48 start_remote_job_p ()
  49 {
  50   static int inited = 0;
  51   int status;
  52
  53   /* Allow the user to turn off job exportation
  54      (useful while he is debugging Customs, for example).  */
  55   if (getenv ("GNU_MAKE_NO_CUSTOMS") != 0)
  56     return 0;
  57
  58   if (!inited)
  59     {
  60       /* For secure Customs, make is installed setuid root and
  61          Customs requires a privileged source port be used.  */
  62       make_access ();
  63
  64       /* Ping the daemon once to see if it is there.  */
  65       inited = Customs_Ping () == RPC_SUCCESS ? 1 : -1;
  66
  67       /* Return to normal user access.  */
  68       user_access ();
  69
  70       if (starting_directory == 0)
  71         /* main couldn't figure it out.  */
  72         inited = -1;
  73       else
  74         {
  75           /* Normalize the current directory path name to something
  76              that should work on all machines exported to.  */
  77
  78           normalized_cwd = (char *) xmalloc (GET_PATH_MAX);
  79           strcpy (normalized_cwd, starting_directory);
  80           if (Customs_NormPath (normalized_cwd, GET_PATH_MAX) < 0)
  81             /* Path normalization failure means using Customs
  82                won't work, but it's not really an error.  */
  83             inited = -1;
  84         }
  85     }
  86
  87   if (inited < 0)
  88     return 0;
  89
  90   status = Customs_Host (EXPORT_SAME, &permit);
  91   if (status != RPC_SUCCESS)
  92     {
  93       if (debug_flag)
  94         printf ("Customs won't export: %s\n", Rpc_ErrorMessage (status));
  95       return 0;
  96     }
  97
  98   return !CUSTOMS_FAIL (&permit.addr);
  99 }
 100 \f
 101 /* Start a remote job running the command in ARGV, with environment from
 102    ENVP.  It gets standard input from STDIN_FD.  On failure, return
 103    nonzero.  On success, return zero, and set *USED_STDIN to nonzero if it
 104    will actually use STDIN_FD, zero if not, set *ID_PTR to a unique
 105    identification, and set *IS_REMOTE to nonzero if the job is remote, zero
 106    if it is local (meaning *ID_PTR is a process ID).  */
 107
 108 int
 109 start_remote_job (argv, envp, stdin_fd, is_remote, id_ptr, used_stdin)
 110      char **argv, **envp;
 111      int stdin_fd;
 112      int *is_remote;
 113      int *id_ptr;
 114      int *used_stdin;
 115 {
 116   extern int vfork (), execve ();
 117   char waybill[MAX_DATA_SIZE], msg[128];
 118   struct timeval timeout;
 119   struct sockaddr_in sin;
 120   int len;
 121   int retsock, retport, sock;
 122   Rpc_Stat status;
 123   int pid;
 124
 125   /* Create the return socket.  */
 126   retsock = Rpc_UdpCreate (True, 0);
 127   if (retsock < 0)
 128     {
 129       error ("exporting: Couldn't create return socket.");
 130       return 1;
 131     }
 132
 133   /* Get the return socket's port number.  */
 134   len = sizeof (sin);
 135   if (getsockname (retsock, (struct sockaddr *) &sin, &len) < 0)
 136     {
 137       (void) close (retsock);
 138       perror_with_name ("exporting: ", "getsockname");
 139       return 1;
 140     }
 141   retport = sin.sin_port;
 142
 143   /* Create the TCP socket for talking to the remote child.  */
 144   sock = Rpc_TcpCreate (False, 0);
 145
 146   /* Create a WayBill to give to the server.  */
 147   len = Customs_MakeWayBill (&permit, normalized_cwd, argv[0], argv,
 148                              envp, retport, waybill);
 149
 150   /* Modify the waybill as if the remote child had done `child_access ()'.  */
 151   {
 152     WayBill *wb = (WayBill *) waybill;
 153     wb->euid = wb->ruid;
 154     wb->rgid = wb->rgid;
 155   }
 156
 157   /* Send the request to the server, timing out in 20 seconds.  */
 158   timeout.tv_usec = 0;
 159   timeout.tv_sec = 20;
 160   sin.sin_family = AF_INET;
 161   sin.sin_port = htons (Customs_Port ());
 162   sin.sin_addr = permit.addr;
 163   status = Rpc_Call (sock, &sin, (Rpc_Proc) CUSTOMS_IMPORT,
 164                      len, (Rpc_Opaque) waybill,
 165                      sizeof(msg), (Rpc_Opaque) msg,
 166                      1, &timeout);
 167   if (status != RPC_SUCCESS)
 168     {
 169       (void) close (retsock);
 170       (void) close (sock);
 171       error ("exporting: %s", Rpc_ErrorMessage (status));
 172       return 1;
 173     }
 174   else if (msg[0] != 'O' || msg[1] != 'k' || msg[2] != '\0')
 175     {
 176       (void) close (retsock);
 177       (void) close (sock);
 178       error ("CUSTOMS_IMPORT: %s", msg);
 179       return 1;
 180     }
 181   else if (debug_flag)
 182     {
 183       struct hostent *host = gethostbyaddr (&permit.addr, sizeof (permit.addr),
 184                                             AF_INET);
 185       printf ("Job exported to %s ID %u\n",
 186               host == 0 ? inet_ntoa (permit.addr) : host->h_name,
 187               permit.id);
 188     }
 189
 190   fflush (stdout);
 191   fflush (stderr);
 192
 193   pid = vfork ();
 194   if (pid < 0)
 195     {
 196       /* The fork failed!  */
 197       perror_with_name ("vfork", "");
 198       return 1;
 199     }
 200   else if (pid == 0)
 201     {
 202       /* Child side.  Run `export' to handle the connection.  */
 203       static char sock_buf[20], retsock_buf[20], id_buf[20];
 204       static char *new_argv[6] =
 205         { EXPORT_COMMAND, "-id", sock_buf, retsock_buf, id_buf, 0 };
 206
 207       /* Set up the arguments.  */
 208       (void) sprintf (sock_buf, "%d", sock);
 209       (void) sprintf (retsock_buf, "%d", retsock);
 210       (void) sprintf (id_buf, "%x", permit.id);
 211
 212       /* Get the right stdin.  */
 213       if (stdin_fd != 0)
 214         (void) dup2 (stdin_fd, 0);
 215
 216       /* Unblock signals in the child.  */
 217       unblock_sigs ();
 218
 219       /* Run the command.  */
 220       exec_command (new_argv, envp);
 221     }
 222
 223   /* Parent side.  Return the `export' process's ID.  */
 224   (void) close (retsock);
 225   (void) close (sock);
 226   *is_remote = 0;
 227   *id_ptr = pid;
 228   return 0;
 229 }
 230 \f
 231 /* Get the status of a dead remote child.  Block waiting for one to die
 232    if BLOCK is nonzero.  Set *EXIT_CODE_PTR to the exit status, *SIGNAL_PTR
 233    to the termination signal or zero if it exited normally, and *COREDUMP_PTR
 234    nonzero if it dumped core.  Return the ID of the child that died,
 235    0 if we would have to block and !BLOCK, or < 0 if there were none.  */
 236
 237 int
 238 remote_status (exit_code_ptr, signal_ptr, coredump_ptr, block)
 239      int *exit_code_ptr, *signal_ptr, *coredump_ptr;
 240      int block;
 241 {
 242   return -1;
 243 }
 244
 245 /* Block asynchronous notification of remote child death.
 246    If this notification is done by raising the child termination
 247    signal, do not block that signal.  */
 248 void
 249 block_remote_children ()
 250 {
 251   return;
 252 }
 253
 254 /* Restore asynchronous notification of remote child death.
 255    If this is done by raising the child termination signal,
 256    do not unblock that signal.  */
 257 void
 258 unblock_remote_children ()
 259 {
 260   return;
 261 }
 262
 263 /* Send signal SIG to child ID.  Return 0 if successful, -1 if not.  */
 264 int
 265 remote_kill (id, sig)
 266      int id;
 267      int sig;
 268 {
 269   return -1;
 270 }