main.c

Rsync 3.0.5 source code

			io_start_buffering_out(f_out);
		if (!filesfrom_host)
			set_msg_fd_in(f_in);
		send_filter_list(f_out);
		if (filesfrom_host)
			filesfrom_fd = f_in;

		if (write_batch && !am_server)
			start_write_batch(f_out);
		flist = send_file_list(f_out, argc, argv);
		set_msg_fd_in(-1);
		if (verbose > 3)
			rprintf(FINFO,"file list sent\n");

		if (protocol_version >= 23)
			io_start_multiplex_in();

		io_flush(NORMAL_FLUSH);
		send_files(f_in, f_out);
		io_flush(FULL_FLUSH);
		handle_stats(-1);
		if (protocol_version >= 24)
			read_final_goodbye(f_in);
		if (pid != -1) {
			if (verbose > 3)
				rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
			io_flush(FULL_FLUSH);
			wait_process_with_flush(pid, &exit_code);
		}
		output_summary();
		io_flush(FULL_FLUSH);
		exit_cleanup(exit_code);
	}

	if (!read_batch) {
		if (protocol_version >= 23)
			io_start_multiplex_in();
		if (need_messages_from_generator)
			io_start_multiplex_out();
	}

	send_filter_list(read_batch ? -1 : f_out);

	if (filesfrom_fd >= 0) {
		io_set_filesfrom_fds(filesfrom_fd, f_out);
		filesfrom_fd = -1;
	}

	if (write_batch && !am_server)
		start_write_batch(f_in);
	flist = recv_file_list(f_in);
	if (inc_recurse && file_total == 1)
		recv_additional_file_list(f_in);

	if (flist && flist->used > 0) {
		local_name = get_local_name(flist, argv[0]);

		check_alt_basis_dirs();

		exit_code2 = do_recv(f_in, f_out, local_name);
	} else {
		handle_stats(-1);
		output_summary();
	}

	if (pid != -1) {
		if (verbose > 3)
			rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
		io_flush(FULL_FLUSH);
		wait_process_with_flush(pid, &exit_code);
	}

	return MAX(exit_code, exit_code2);
}

static int copy_argv(char *argv[])
{
	int i;

	for (i = 0; argv[i]; i++) {
		if (!(argv[i] = strdup(argv[i]))) {
			rprintf (FERROR, "out of memory at %s(%d)\n",
				 __FILE__, __LINE__);
			return RERR_MALLOC;
		}
	}

	return 0;
}


/**
 * Start a client for either type of remote connection.  Work out
 * whether the arguments request a remote shell or rsyncd connection,
 * and call the appropriate connection function, then run_client.
 *
 * Calls either start_socket_client (for sockets) or do_cmd and
 * client_run (for ssh).
 **/
static int start_client(int argc, char *argv[])
{
	char *p, *shell_machine = NULL, *shell_user = NULL;
	char **remote_argv;
	int remote_argc;
	int f_in, f_out;
	int ret;
	pid_t pid;

	/* Don't clobber argv[] so that ps(1) can still show the right
	 * command line. */
	if ((ret = copy_argv(argv)) != 0)
		return ret;

	if (!read_batch) { /* for read_batch, NO source is specified */
		char *path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
		if (path) { /* source is remote */
			char *dummy_host;
			int dummy_port = 0;
			*argv = path;
			remote_argv = argv;
			remote_argc = argc;
			argv += argc - 1;
			if (argc == 1 || **argv == ':')
				argc = 0; /* no dest arg */
			else if (check_for_hostspec(*argv, &dummy_host, &dummy_port)) {
				rprintf(FERROR,
					"The source and destination cannot both be remote.\n");
				exit_cleanup(RERR_SYNTAX);
			} else {
				remote_argc--; /* don't count dest */
				argc = 1;
			}
			if (filesfrom_host && *filesfrom_host
			    && strcmp(filesfrom_host, shell_machine) != 0) {
				rprintf(FERROR,
					"--files-from hostname is not the same as the transfer hostname\n");
				exit_cleanup(RERR_SYNTAX);
			}
			am_sender = 0;
			if (rsync_port)
				daemon_over_rsh = shell_cmd ? 1 : -1;
		} else { /* source is local, check dest arg */
			am_sender = 1;

			if (argc > 1) {
				p = argv[--argc];
				remote_argv = argv + argc;
			} else {
				static char *dotarg[1] = { "." };
				p = dotarg[0];
				remote_argv = dotarg;
			}
			remote_argc = 1;

			path = check_for_hostspec(p, &shell_machine, &rsync_port);
			if (path && filesfrom_host && *filesfrom_host
			    && strcmp(filesfrom_host, shell_machine) != 0) {
				rprintf(FERROR,
					"--files-from hostname is not the same as the transfer hostname\n");
				exit_cleanup(RERR_SYNTAX);
			}
			if (!path) { /* no hostspec found, so src & dest are local */
				local_server = 1;
				if (filesfrom_host) {
					rprintf(FERROR,
						"--files-from cannot be remote when the transfer is local\n");
					exit_cleanup(RERR_SYNTAX);
				}
				shell_machine = NULL;
			} else { /* hostspec was found, so dest is remote */
				argv[argc] = path;
				if (rsync_port)
					daemon_over_rsh = shell_cmd ? 1 : -1;
			}
		}
	} else {  /* read_batch */
		local_server = 1;
		if (check_for_hostspec(argv[argc-1], &shell_machine, &rsync_port)) {
			rprintf(FERROR, "remote destination is not allowed with --read-batch\n");
			exit_cleanup(RERR_SYNTAX);
		}
		remote_argv = argv += argc - 1;
		remote_argc = argc = 1;
	}

	if (am_sender) {
		char *dummy_host;
		int dummy_port = rsync_port;
		int i;
		/* For local source, extra source args must not have hostspec. */
		for (i = 1; i < argc; i++) {
			if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
				rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
				exit_cleanup(RERR_SYNTAX);
			}
		}
	} else {
		char *dummy_host;
		int dummy_port = rsync_port;
		int i;
		/* For remote source, any extra source args must have either
		 * the same hostname or an empty hostname. */
		for (i = 1; i < remote_argc; i++) {
			char *arg = check_for_hostspec(remote_argv[i], &dummy_host, &dummy_port);
			if (!arg) {
				rprintf(FERROR, "Unexpected local arg: %s\n", remote_argv[i]);
				rprintf(FERROR, "If arg is a remote file/dir, prefix it with a colon (:).\n");
				exit_cleanup(RERR_SYNTAX);
			}
			if (*dummy_host && strcmp(dummy_host, shell_machine) != 0) {
				rprintf(FERROR, "All source args must come from the same machine.\n");
				exit_cleanup(RERR_SYNTAX);
			}
			if (rsync_port != dummy_port) {
				if (!rsync_port || !dummy_port)
					rprintf(FERROR, "All source args must use the same hostspec format.\n");
				else
					rprintf(FERROR, "All source args must use the same port number.\n");
				exit_cleanup(RERR_SYNTAX);
			}
			remote_argv[i] = arg;
		}
	}

	if (daemon_over_rsh < 0)
		return start_socket_client(shell_machine, remote_argc, remote_argv, argc, argv);

	if (password_file && !daemon_over_rsh) {
		rprintf(FERROR, "The --password-file option may only be "
				"used when accessing an rsync daemon.\n");
		exit_cleanup(RERR_SYNTAX);
	}

	if (connect_timeout) {
		rprintf(FERROR, "The --contimeout option may only be "
				"used when connecting to an rsync daemon.\n");
		exit_cleanup(RERR_SYNTAX);
	}

	if (shell_machine) {
		p = strrchr(shell_machine,'@');
		if (p) {
			*p = 0;
			shell_user = shell_machine;
			shell_machine = p+1;
		}
	}

	if (verbose > 3) {
		rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
			NS(shell_cmd), NS(shell_machine), NS(shell_user),
			remote_argv ? NS(remote_argv[0]) : "");
	}

	pid = do_cmd(shell_cmd, shell_machine, shell_user, remote_argv, remote_argc,
		     &f_in, &f_out);

	/* if we're running an rsync server on the remote host over a
	 * remote shell command, we need to do the RSYNCD protocol first */
	if (daemon_over_rsh) {
		int tmpret;
		tmpret = start_inband_exchange(f_in, f_out, shell_user, remote_argc, remote_argv);
		if (tmpret < 0)
			return tmpret;
	}

	ret = client_run(f_in, f_out, pid, argc, argv);

	fflush(stdout);
	fflush(stderr);

	return ret;
}


static RETSIGTYPE sigusr1_handler(UNUSED(int val))
{
	exit_cleanup(RERR_SIGNAL1);
}

static RETSIGTYPE sigusr2_handler(UNUSED(int val))
{
	if (!am_server)
		output_summary();
	close_all();
	if (got_xfer_error)
		_exit(RERR_PARTIAL);
	_exit(0);
}

RETSIGTYPE remember_children(UNUSED(int val))
{
#ifdef WNOHANG
	int cnt, status;
	pid_t pid;
	/* An empty waitpid() loop was put here by Tridge and we could never
	 * get him to explain why he put it in, so rather than taking it
	 * out we're instead saving the child exit statuses for later use.
	 * The waitpid() loop presumably eliminates all possibility of leaving
	 * zombie children, maybe that's why he did it. */
	while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
		/* save the child's exit status */
		for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
			if (pid_stat_table[cnt].pid == 0) {
				pid_stat_table[cnt].pid = pid;
				pid_stat_table[cnt].status = status;
				break;
			}
		}
	}
#endif
#ifndef HAVE_SIGACTION
	signal(SIGCHLD, remember_children);
#endif
}


/**
 * This routine catches signals and tries to send them to gdb.
 *
 * Because it's called from inside a signal handler it ought not to
 * use too many library routines.
 *
 * @todo Perhaps use "screen -X" instead/as well, to help people
 * debugging without easy access to X.  Perhaps use an environment
 * variable, or just call a script?
 *
 * @todo The /proc/ magic probably only works on Linux (and
 * Solaris?)  Can we be more portable?
 **/
#ifdef MAINTAINER_MODE
const char *get_panic_action(void)
{
	const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");

	if (cmd_fmt)
		return cmd_fmt;
	else
		return "xterm -display :0 -T Panic -n Panic "
			"-e gdb /proc/%d/exe %d";
}


/**
 * Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
 *
 * This signal handler is only installed if we were configured with
 * --enable-maintainer-mode.  Perhaps it should always be on and we
 * should just look at the environment variable, but I'm a bit leery
 * of a signal sending us into a busy loop.
 **/
static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
{
	char cmd_buf[300];
	int ret;

	snprintf(cmd_buf, sizeof cmd_buf, get_panic_action(),
		 getpid(), getpid());

	/* Unless we failed to execute gdb, we allow the process to
	 * continue.  I'm not sure if that's right. */
	ret = system(cmd_buf);
	if (ret)
		_exit(ret);
}
#endif


int main(int argc,char *argv[])
{
	int ret;
	int orig_argc = argc;
	char **orig_argv = argv;
#ifdef HAVE_SIGACTION
# ifdef HAVE_SIGPROCMASK
	sigset_t sigmask;

	sigemptyset(&sigmask);
# endif
	sigact.sa_flags = SA_NOCLDSTOP;
#endif
	SIGACTMASK(SIGUSR1, sigusr1_handler);
	SIGACTMASK(SIGUSR2, sigusr2_handler);
	SIGACTMASK(SIGCHLD, remember_children);
#ifdef MAINTAINER_MODE
	SIGACTMASK(SIGSEGV, rsync_panic_handler);
	SIGACTMASK(SIGFPE, rsync_panic_handler);
	SIGACTMASK(SIGABRT, rsync_panic_handler);
	SIGACTMASK(SIGBUS, rsync_panic_handler);
#endif

	starttime = time(NULL);
	our_uid = MY_UID();
	am_root = our_uid == 0;

	memset(&stats, 0, sizeof(stats));

	if (argc < 2) {
		usage(FERROR);
		exit_cleanup(RERR_SYNTAX);
	}

	/* we set a 0 umask so that correct file permissions can be
	 * carried across */
	orig_umask = umask(0);

#if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
	setlocale(LC_CTYPE, "");
#endif

	if (!parse_arguments(&argc, (const char ***) &argv)) {
		/* FIXME: We ought to call the same error-handling
		 * code here, rather than relying on getopt. */
		option_error();
		exit_cleanup(RERR_SYNTAX);
	}

	SIGACTMASK(SIGINT, sig_int);
	SIGACTMASK(SIGHUP, sig_int);
	SIGACTMASK(SIGTERM, sig_int);
#if defined HAVE_SIGACTION && HAVE_SIGPROCMASK
	sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
#endif

	/* Ignore SIGPIPE; we consistently check error codes and will
	 * see the EPIPE. */
	SIGACTION(SIGPIPE, SIG_IGN);
#ifdef SIGXFSZ
	SIGACTION(SIGXFSZ, SIG_IGN);
#endif

	/* Initialize change_dir() here because on some old systems getcwd
	 * (implemented by forking "pwd" and reading its output) doesn't
	 * work when there are other child processes.  Also, on all systems
	 * that implement getcwd that way "pwd" can't be found after chroot. */
	change_dir(NULL, CD_NORMAL);

	init_flist();

	if ((write_batch || read_batch) && !am_server) {
		if (write_batch)
			write_batch_shell_file(orig_argc, orig_argv, argc);

		if (read_batch && strcmp(batch_name, "-") == 0)
			batch_fd = STDIN_FILENO;
		else {
			batch_fd = do_open(batch_name,
				   write_batch ? O_WRONLY | O_CREAT | O_TRUNC
				   : O_RDONLY, S_IRUSR | S_IWUSR);
		}
		if (batch_fd < 0) {
			rsyserr(FERROR, errno, "Batch file %s open error",
				full_fname(batch_name));
			exit_cleanup(RERR_FILEIO);
		}
		if (read_batch)
			read_stream_flags(batch_fd);
		else
			write_stream_flags(batch_fd);
	}
	if (write_batch < 0)
		dry_run = 1;

	if (am_server) {
#ifdef ICONV_CONST
		setup_iconv();
#endif
	} else if (am_daemon)
		return daemon_main();

	if (am_server && protect_args) {
		char buf[MAXPATHLEN];
		protect_args = 2;
		read_args(STDIN_FILENO, NULL, buf, sizeof buf, 1, &argv, &argc, NULL);
		if (!parse_arguments(&argc, (const char ***) &argv)) {
			option_error();
			exit_cleanup(RERR_SYNTAX);
		}
	}

	if (argc < 1) {
		usage(FERROR);
		exit_cleanup(RERR_SYNTAX);
	}

	if (am_server) {
		set_nonblocking(STDIN_FILENO);
		set_nonblocking(STDOUT_FILENO);
		if (am_daemon)
			return start_daemon(STDIN_FILENO, STDOUT_FILENO);
		start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
	}

	ret = start_client(argc, argv);
	if (ret == -1)
		exit_cleanup(RERR_STARTCLIENT);
	else
		exit_cleanup(ret);

	return ret;
}