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300 lines
8.4 KiB
C
300 lines
8.4 KiB
C
/* GNU Make remote job exportation interface to the Customs daemon.
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THIS CODE IS NOT SUPPORTED BY THE GNU PROJECT.
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Please do not send bug reports or questions about it to
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the Make maintainers.
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Copyright (C) 1988-2016 Free Software Foundation, Inc.
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This file is part of GNU Make.
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GNU Make is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3 of the License, or (at your option) any later
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version.
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GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "makeint.h"
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#include "filedef.h"
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#include "commands.h"
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#include "job.h"
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#include "debug.h"
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#include <sys/time.h>
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#include <netdb.h>
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#include "customs.h"
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char *remote_description = "Customs";
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/* File name of the Customs 'export' client command.
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A full path name can be used to avoid some path-searching overhead. */
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#define EXPORT_COMMAND "/usr/local/bin/export"
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/* ExportPermit gotten by start_remote_job_p, and used by start_remote_job. */
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static ExportPermit permit;
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/* Normalized path name of the current directory. */
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static char *normalized_cwd;
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/* Call once at startup even if no commands are run. */
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void
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remote_setup (void)
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{
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}
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/* Called before exit. */
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void
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remote_cleanup (void)
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{
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}
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/* Return nonzero if the next job should be done remotely. */
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int
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start_remote_job_p (int first_p)
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{
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static int inited = 0;
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int status;
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int njobs;
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if (!inited)
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{
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/* Allow the user to turn off job exportation (useful while he is
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debugging Customs, for example). */
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if (getenv ("GNU_MAKE_NO_CUSTOMS") != 0)
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{
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inited = -1;
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return 0;
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}
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/* For secure Customs, make is installed setuid root and
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Customs requires a privileged source port be used. */
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make_access ();
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if (ISDB (DB_JOBS))
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Rpc_Debug (1);
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/* Ping the daemon once to see if it is there. */
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inited = Customs_Ping () == RPC_SUCCESS ? 1 : -1;
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/* Return to normal user access. */
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user_access ();
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if (starting_directory == 0)
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/* main couldn't figure it out. */
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inited = -1;
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else
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{
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/* Normalize the current directory path name to something
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that should work on all machines exported to. */
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normalized_cwd = xmalloc (GET_PATH_MAX);
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strcpy (normalized_cwd, starting_directory);
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if (Customs_NormPath (normalized_cwd, GET_PATH_MAX) < 0)
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/* Path normalization failure means using Customs
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won't work, but it's not really an error. */
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inited = -1;
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}
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}
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if (inited < 0)
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return 0;
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njobs = job_slots_used;
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if (!first_p)
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njobs -= 1; /* correction for being called from reap_children() */
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/* the first job should run locally, or, if the -l flag is given, we use
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that as clue as to how many local jobs should be scheduled locally */
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if (max_load_average < 0 && njobs == 0 || njobs < max_load_average)
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return 0;
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status = Customs_Host (EXPORT_SAME, &permit);
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if (status != RPC_SUCCESS)
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{
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DB (DB_JOBS, (_("Customs won't export: %s\n"),
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Rpc_ErrorMessage (status)));
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return 0;
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}
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return !CUSTOMS_FAIL (&permit.addr);
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}
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/* Start a remote job running the command in ARGV, with environment from
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ENVP. It gets standard input from STDIN_FD. On failure, return
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nonzero. On success, return zero, and set *USED_STDIN to nonzero if it
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will actually use STDIN_FD, zero if not, set *ID_PTR to a unique
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identification, and set *IS_REMOTE to nonzero if the job is remote, zero
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if it is local (meaning *ID_PTR is a process ID). */
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int
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start_remote_job (char **argv, char **envp, int stdin_fd,
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int *is_remote, int *id_ptr, int *used_stdin)
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{
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char waybill[MAX_DATA_SIZE], msg[128];
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struct hostent *host;
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struct timeval timeout;
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struct sockaddr_in sin;
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int len;
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int retsock, retport, sock;
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Rpc_Stat status;
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int pid;
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/* Create the return socket. */
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retsock = Rpc_UdpCreate (True, 0);
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if (retsock < 0)
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{
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O (error, NILF, "exporting: Couldn't create return socket.");
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return 1;
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}
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/* Get the return socket's port number. */
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len = sizeof (sin);
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if (getsockname (retsock, (struct sockaddr *) &sin, &len) < 0)
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{
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(void) close (retsock);
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perror_with_name ("exporting: ", "getsockname");
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return 1;
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}
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retport = sin.sin_port;
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/* Create the TCP socket for talking to the remote child. */
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sock = Rpc_TcpCreate (False, 0);
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/* Create a WayBill to give to the server. */
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len = Customs_MakeWayBill (&permit, normalized_cwd, argv[0], argv,
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envp, retport, waybill);
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/* Modify the waybill as if the remote child had done 'child_access ()'. */
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{
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WayBill *wb = (WayBill *) waybill;
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wb->ruid = wb->euid;
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wb->rgid = wb->egid;
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}
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/* Send the request to the server, timing out in 20 seconds. */
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timeout.tv_usec = 0;
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timeout.tv_sec = 20;
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sin.sin_family = AF_INET;
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sin.sin_port = htons (Customs_Port ());
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sin.sin_addr = permit.addr;
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status = Rpc_Call (sock, &sin, (Rpc_Proc) CUSTOMS_IMPORT,
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len, (Rpc_Opaque) waybill,
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sizeof (msg), (Rpc_Opaque) msg,
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1, &timeout);
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host = gethostbyaddr ((char *)&permit.addr, sizeof(permit.addr), AF_INET);
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{
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const char *hnm = host ? host->h_name : inet_ntoa (permit.addr);
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size_t hlen = strlen (hnm);
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if (status != RPC_SUCCESS)
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{
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const char *err = Rpc_ErrorMessage (status);
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(void) close (retsock);
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(void) close (sock);
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error (NILF, hlen + strlen (err),
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"exporting to %s: %s", hnm, err);
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return 1;
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}
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else if (msg[0] != 'O' || msg[1] != 'k' || msg[2] != '\0')
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{
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(void) close (retsock);
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(void) close (sock);
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error (NILF, hlen + strlen (msg), "exporting to %s: %s", hnm, msg);
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return 1;
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}
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else
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{
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error (NILF, hlen + INTSTR_LENGTH,
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"*** exported to %s (id %u)", hnm, permit.id);
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}
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fflush (stdout);
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fflush (stderr);
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}
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pid = vfork ();
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if (pid < 0)
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{
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/* The fork failed! */
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perror_with_name ("fork", "");
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return 1;
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}
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else if (pid == 0)
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{
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/* Child side. Run 'export' to handle the connection. */
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static char sock_buf[20], retsock_buf[20], id_buf[20];
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static char *new_argv[6] =
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{ EXPORT_COMMAND, "-id", sock_buf, retsock_buf, id_buf, 0 };
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/* Set up the arguments. */
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(void) sprintf (sock_buf, "%d", sock);
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(void) sprintf (retsock_buf, "%d", retsock);
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(void) sprintf (id_buf, "%x", permit.id);
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/* Get the right stdin. */
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if (stdin_fd != 0)
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(void) dup2 (stdin_fd, 0);
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/* Unblock signals in the child. */
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unblock_sigs ();
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/* Run the command. */
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exec_command (new_argv, envp);
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}
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/* Parent side. Return the 'export' process's ID. */
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(void) close (retsock);
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(void) close (sock);
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*is_remote = 0;
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*id_ptr = pid;
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*used_stdin = 1;
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return 0;
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}
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/* Get the status of a dead remote child. Block waiting for one to die
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if BLOCK is nonzero. Set *EXIT_CODE_PTR to the exit status, *SIGNAL_PTR
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to the termination signal or zero if it exited normally, and *COREDUMP_PTR
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nonzero if it dumped core. Return the ID of the child that died,
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0 if we would have to block and !BLOCK, or < 0 if there were none. */
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int
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remote_status (int *exit_code_ptr, int *signal_ptr, int *coredump_ptr,
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int block)
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{
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return -1;
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}
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/* Block asynchronous notification of remote child death.
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If this notification is done by raising the child termination
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signal, do not block that signal. */
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void
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block_remote_children (void)
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{
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return;
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}
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/* Restore asynchronous notification of remote child death.
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If this is done by raising the child termination signal,
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do not unblock that signal. */
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void
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unblock_remote_children (void)
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{
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return;
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}
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/* Send signal SIG to child ID. Return 0 if successful, -1 if not. */
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int
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remote_kill (int id, int sig)
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{
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return -1;
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}
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