+++ /dev/null
-// $Id: ncontext.c 2414 2006-12-08 13:20:10Z dhozac $ --*- c -*--
-
-// Copyright (C) 2004-2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
-// Copyright (C) 2006 Daniel Hokka Zakrisson <daniel@hozac.com>
-//
-// This program is free software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation; version 2 of the License.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "util.h"
-#include "lib/internal.h"
-#include "lib_internal/util.h"
-#include "lib_internal/jail.h"
-
-#include <vserver.h>
-#include <getopt.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <assert.h>
-#include <signal.h>
-#include <sys/types.h>
-
-
-#define ENSC_WRAPPERS_PREFIX "ncontext: "
-#define ENSC_WRAPPERS_UNISTD 1
-#define ENSC_WRAPPERS_VSERVER 1
-#define ENSC_WRAPPERS_FCNTL 1
-#define ENSC_WRAPPERS_SOCKET 1
-#define ENSC_WRAPPERS_IOSOCK 1
-#include <wrappers.h>
-
-#define CMD_HELP 0x1000
-#define CMD_VERSION 0x1001
-#define CMD_NID 0x4000
-#define CMD_CREATE 0x4001
-#define CMD_MIGRATE 0x4002
-#define CMD_DISCONNECT 0x4003
-#define CMD_SILENT 0x4004
-#define CMD_SYNCSOCK 0x4005
-#define CMD_SYNCMSG 0x4006
-#define CMD_MIGRATESELF 0x4007
-#define CMD_SILENTEXIST 0x4008
-
-
-struct option const
-CMDLINE_OPTIONS[] = {
- { "help", no_argument, 0, CMD_HELP },
- { "version", no_argument, 0, CMD_VERSION },
- { "nid", required_argument, 0, CMD_NID },
- { "create", no_argument, 0, CMD_CREATE },
- { "migrate", no_argument, 0, CMD_MIGRATE },
- { "migrate-self", no_argument, 0, CMD_MIGRATESELF },
- { "disconnect", no_argument, 0, CMD_DISCONNECT },
- { "silent", no_argument, 0, CMD_SILENT },
- { "silentexist", no_argument, 0, CMD_SILENTEXIST },
- { "syncsock", required_argument, 0, CMD_SYNCSOCK },
- { "syncmsg", required_argument, 0, CMD_SYNCMSG },
- { 0,0,0,0 },
-};
-
-struct Arguments {
- bool do_create;
- bool do_migrate;
- bool do_migrateself;
- bool do_disconnect;
- bool is_silentexist;
- int verbosity;
- nid_t nid;
- char const * sync_sock;
- char const * sync_msg;
-};
-
-int wrapper_exit_code = 255;
-
-static void
-showHelp(int fd, char const *cmd, int res)
-{
- WRITE_MSG(fd, "Usage:\n ");
- WRITE_STR(fd, cmd);
- WRITE_MSG(fd,
- " --create [--nid <nid>] <opts>* [--] <program> <args>*\n ");
- WRITE_STR(fd, cmd);
- WRITE_MSG(fd,
- " [(--migrate --nid <nid>)|--migrate-self] <opts>* [--] <program> <args>*\n"
- "\n"
- "<opts> can be:\n"
- " --disconnect ... start program in background\n"
- " --silent ... be silent\n"
- " --silentexist ... be silent when context exists already; useful\n"
- " for '--create' only\n"
- " --syncsock <filename>\n"
- " ... before executing the program, send a message\n"
- " to the socket and wait until it closes.\n"
- " <filename> must be a SOCK_STREAM unix socket\n"
- " --syncmsg <message>\n"
- " ... use <message> as synchronization message; by\n"
- " default, 'ok' will be used\n"
- "\n"
- "'ncontext --create' exits with code 254 iff the context exists already.\n"
- "\n"
- "Please report bugs to " PACKAGE_BUGREPORT "\n");
-
- exit(res);
-}
-
-static void
-showVersion()
-{
- WRITE_MSG(1,
- "ncontext " VERSION " -- manages the creation of network contexts\n"
- "This program is part of " PACKAGE_STRING "\n\n"
- "Copyright (C) 2004-2006 Enrico Scholz\n"
- "Copyright (C) 2006 Daniel Hokka Zakrisson\n"
- VERSION_COPYRIGHT_DISCLAIMER);
- exit(0);
-}
-
-#include "context-sync.hc"
-
-static inline ALWAYSINLINE void
-tellContext(nid_t nid, bool do_it)
-{
- char buf[sizeof(nid_t)*3+2];
- size_t l;
-
- if (!do_it) return;
-
- l = utilvserver_fmt_long(buf,nid);
-
- WRITE_MSG(1, "New network context is ");
- Vwrite (1, buf, l);
- WRITE_MSG(1, "\n");
-}
-
-static int
-connectExternalSync(char const *filename)
-{
- int fd;
- struct sockaddr_un addr;
-
- if (filename==0) return -1;
-
- ENSC_INIT_UNIX_SOCK(addr, filename);
-
- fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
- Econnect(fd, &addr, sizeof(addr));
-
- return fd;
-}
-
-static void
-doExternalSync(int fd, char const *msg)
-{
- char c;
-
- if (fd==-1) return;
-
- if (msg) EsendAll(fd, msg, strlen(msg));
- Eshutdown(fd, SHUT_WR);
-
- if (TEMP_FAILURE_RETRY(recv(fd, &c, 1, MSG_NOSIGNAL))!=0) {
- WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "unexpected external synchronization event\n");
- exit(wrapper_exit_code);
- }
-
- Eclose(fd);
-}
-
-static inline ALWAYSINLINE int
-doit(struct Arguments const *args, char *argv[])
-{
- int p[2][2];
- pid_t pid = initSync(p, args->do_disconnect);
-
- if (pid==0) {
- nid_t nid;
- int ext_sync_fd = connectExternalSync(args->sync_sock);
-
- doSyncStage0(p, args->do_disconnect);
-
- if (args->do_create) {
- nid = vc_net_create(args->nid);
- if (nid==VC_NOCTX) {
- switch (errno) {
- case EEXIST :
- if (!args->is_silentexist)
- perror(ENSC_WRAPPERS_PREFIX "vc_net_create()");
- return 254;
- default :
- perror(ENSC_WRAPPERS_PREFIX "vc_net_create()");
- return wrapper_exit_code;
- }
- }
- tellContext(nid, args->verbosity>=1);
- }
- else
- nid = args->nid;
-
- if (args->do_migrate && !args->do_migrateself)
- Evc_net_migrate(nid);
-
- doExternalSync(ext_sync_fd, args->sync_msg);
- doSyncStage1(p, args->do_disconnect);
- DPRINTF("doit: pid=%u, ppid=%u\n", getpid(), getppid());
- execvp (argv[optind],argv+optind);
- doSyncStage2(p, args->do_disconnect);
-
- PERROR_Q(ENSC_WRAPPERS_PREFIX "execvp", argv[optind]);
- exit(wrapper_exit_code);
- }
-
- assert(args->do_disconnect);
-
- waitOnSync(pid, p, args->nid!=VC_DYNAMIC_XID && args->do_migrate);
- return EXIT_SUCCESS;
-}
-
-int main (int argc, char *argv[])
-{
- struct Arguments args = {
- .nid = VC_DYNAMIC_XID,
- .do_create = false,
- .do_migrate = false,
- .do_migrateself = false,
- .do_disconnect = false,
- .is_silentexist = false,
- .verbosity = 1,
- .sync_msg = "ok",
- };
-
- while (1) {
- int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
- if (c==-1) break;
-
- switch (c) {
- case CMD_HELP : showHelp(1, argv[0], 0);
- case CMD_VERSION : showVersion();
- case CMD_CREATE : args.do_create = true; break;
- case CMD_MIGRATE : args.do_migrate = true; break;
- case CMD_DISCONNECT : args.do_disconnect = true; break;
- case CMD_SILENTEXIST : args.is_silentexist = true; break;
- case CMD_SYNCSOCK : args.sync_sock = optarg; break;
- case CMD_SYNCMSG : args.sync_msg = optarg; break;
- case CMD_NID : args.nid = Evc_nidopt2nid(optarg,true); break;
- case CMD_SILENT : --args.verbosity; break;
- case CMD_MIGRATESELF :
- args.do_migrate = true;
- args.do_migrateself = true;
- break;
-
- default :
- WRITE_MSG(2, "Try '");
- WRITE_STR(2, argv[0]);
- WRITE_MSG(2, " --help' for more information.\n");
- return wrapper_exit_code;
- break;
- }
- }
-
- signal(SIGCHLD, SIG_DFL);
-
- if (args.do_migrateself)
- args.nid = Evc_get_task_nid(0);
-
- if (!args.do_create && !args.do_migrate)
- WRITE_MSG(2, "Neither '--create' nor '--migrate' specified; try '--help' for more information\n");
- else if (args.do_create && args.do_migrate)
- WRITE_MSG(2, "Can not specify '--create' and '--migrate' at the same time; try '--help' for more information\n");
- else if (!args.do_create && args.nid==VC_DYNAMIC_XID)
- WRITE_MSG(2, "Can not migrate to an unknown context\n");
- else if (optind>=argc)
- WRITE_MSG(2, "No command given; use '--help' for more information.\n");
- else
- return doit(&args, argv);
-
- return wrapper_exit_code;
-}
git://git.onelab.eu / util-vserver.git / blobdiff