Attachment 1661 Details for Bug 3392 – main.c from my custom rsync, showing rewritten get_local_name

main.c from my custom rsync, showing rewritten get_local_name

main.c (text/x-csrc), 32.31 KB, created by Matt McCutchen on 2006-01-10 17:22:36 UTC

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Creator: Matt McCutchen

Created: 2006-01-10 17:22:36 UTC

Size: 32.31 KB

patch

obsolete

>/* -*- c-file-style: "linux" -*-
>
>   Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
>   Copyright (C) Paul Mackerras 1996
>   Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
>
>   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; either version 2 of the License, or
>   (at your option) any later version.
>
>   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., 675 Mass Ave, Cambridge, MA 02139, USA.
>*/
>
>#include "rsync.h"
>#if defined CONFIG_LOCALE && defined HAVE_LOCALE_H
>#include <locale.h>
>#endif
>
>extern int verbose;
>extern int dry_run;
>extern int list_only;
>extern int am_root;
>extern int am_server;
>extern int am_sender;
>extern int am_generator;
>extern int am_daemon;
>extern int blocking_io;
>extern int remove_sent_files;
>extern int daemon_over_rsh;
>extern int need_messages_from_generator;
>extern int kluge_around_eof;
>extern int do_stats;
>extern int log_got_error;
>extern int module_id;
>extern int orig_umask;
>extern int copy_links;
>extern int keep_dirlinks;
>extern int preserve_hard_links;
>extern int protocol_version;
>extern int recurse;
>extern int fuzzy_basis;
>extern int relative_paths;
>extern int rsync_port;
>extern int inplace;
>extern int make_backups;
>extern int whole_file;
>extern int read_batch;
>extern int write_batch;
>extern int batch_fd;
>extern int batch_gen_fd;
>extern int filesfrom_fd;
>extern pid_t cleanup_child_pid;
>extern struct stats stats;
>extern char *filesfrom_host;
>extern char *partial_dir;
>extern char *basis_dir[];
>extern char *rsync_path;
>extern char *shell_cmd;
>extern char *batch_name;
>
>int local_server = 0;
>struct file_list *the_file_list;
>
>/* There's probably never more than at most 2 outstanding child processes,
> * but set it higher, just in case. */
>#define MAXCHILDPROCS 5
>
>struct pid_status {
>	pid_t pid;
>	int   status;
>} pid_stat_table[MAXCHILDPROCS];
>
>static time_t starttime, endtime;
>static int64 total_read, total_written;
>
>static void show_malloc_stats(void);
>
>/****************************************************************************
>wait for a process to exit, calling io_flush while waiting
>****************************************************************************/
>void wait_process(pid_t pid, int *status)
>{
>	pid_t waited_pid;
>	int cnt;
>
>	while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
>		msleep(20);
>		io_flush(FULL_FLUSH);
>	}
>
>	if (waited_pid == -1 && errno == ECHILD) {
>		/* status of requested child no longer available.
>		 * check to see if it was processed by the sigchld_handler.
>		 */
>		for (cnt = 0;  cnt < MAXCHILDPROCS; cnt++) {
>			if (pid == pid_stat_table[cnt].pid) {
>				*status = pid_stat_table[cnt].status;
>				pid_stat_table[cnt].pid = 0;
>				break;
>			}
>		}
>	}
>
>	/* TODO: If the child exited on a signal, then log an
>	 * appropriate error message.  Perhaps we should also accept a
>	 * message describing the purpose of the child.  Also indicate
>	 * this to the caller so that thhey know something went
>	 * wrong.  */
>	*status = WEXITSTATUS(*status);
>}
>
>/* This function gets called from all 3 processes.  We want the client side
> * to actually output the text, but the sender is the only process that has
> * all the stats we need.  So, if we're a client sender, we do the report.
> * If we're a server sender, we write the stats on the supplied fd.  If
> * we're the client receiver we read the stats from the supplied fd and do
> * the report.  All processes might also generate a set of debug stats, if
> * the verbose level is high enough (this is the only thing that the
> * generator process and the server receiver ever do here). */
>static void handle_stats(int f)
>{
>	endtime = time(NULL);
>
>	/* Cache two stats because the read/write code can change it. */
>	total_read = stats.total_read;
>	total_written = stats.total_written;
>
>	if (do_stats && verbose > 1) {
>		/* These come out from every process */
>		show_malloc_stats();
>		show_flist_stats();
>	}
>
>	if (am_generator)
>		return;
>
>	if (am_daemon) {
>		log_exit(0, __FILE__, __LINE__);
>		if (f == -1 || !am_sender)
>			return;
>	}
>
>	if (am_server) {
>		if (am_sender) {
>			write_longint(f, total_read);
>			write_longint(f, total_written);
>			write_longint(f, stats.total_size);
>			if (protocol_version >= 29) {
>				write_longint(f, stats.flist_buildtime);
>				write_longint(f, stats.flist_xfertime);
>			}
>		}
>		return;
>	}
>
>	/* this is the client */
>
>	if (f < 0 && !am_sender) /* e.g. when we got an empty file list. */
>		; 
>	else if (!am_sender) {
>		/* Read the first two in opposite order because the meaning of
>		 * read/write swaps when switching from sender to receiver. */
>		total_written = read_longint(f);
>		total_read = read_longint(f);
>		stats.total_size = read_longint(f);
>		if (protocol_version >= 29) {
>			stats.flist_buildtime = read_longint(f);
>			stats.flist_xfertime = read_longint(f);
>		}
>	} else if (write_batch) {
>		/* The --read-batch process is going to be a client
>		 * receiver, so we need to give it the stats. */
>		write_longint(batch_fd, total_read);
>		write_longint(batch_fd, total_written);
>		write_longint(batch_fd, stats.total_size);
>		if (protocol_version >= 29) {
>			write_longint(batch_fd, stats.flist_buildtime);
>			write_longint(batch_fd, stats.flist_xfertime);
>		}
>	}
>}
>
>static void output_summary(void)
>{
>	if (do_stats) {
>		rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
>		rprintf(FINFO,"Number of files transferred: %d\n",
>			stats.num_transferred_files);
>		rprintf(FINFO,"Total file size: %.0f bytes\n",
>			(double)stats.total_size);
>		rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
>			(double)stats.total_transferred_size);
>		rprintf(FINFO,"Literal data: %.0f bytes\n",
>			(double)stats.literal_data);
>		rprintf(FINFO,"Matched data: %.0f bytes\n",
>			(double)stats.matched_data);
>		rprintf(FINFO,"File list size: %d\n", stats.flist_size);
>		if (stats.flist_buildtime) {
>			rprintf(FINFO,
>				"File list generation time: %.3f seconds\n",
>				(double)stats.flist_buildtime / 1000);
>			rprintf(FINFO,
>				"File list transfer time: %.3f seconds\n",
>				(double)stats.flist_xfertime / 1000);
>		}
>		rprintf(FINFO,"Total bytes sent: %.0f\n",
>			(double)total_written);
>		rprintf(FINFO,"Total bytes received: %.0f\n",
>			(double)total_read);
>	}
>
>	if (verbose || do_stats) {
>		rprintf(FINFO,
>			"\nsent %.0f bytes  received %.0f bytes  %.2f bytes/sec\n",
>			(double)total_written, (double)total_read,
>			(total_written + total_read)/(0.5 + (endtime - starttime)));
>		rprintf(FINFO, "total size is %.0f  speedup is %.2f\n",
>			(double)stats.total_size,
>			(double)stats.total_size / (total_written+total_read));
>	}
>
>	fflush(stdout);
>	fflush(stderr);
>}
>
>
>/**
> * If our C library can get malloc statistics, then show them to FINFO
> **/
>static void show_malloc_stats(void)
>{
>#ifdef HAVE_MALLINFO
>	struct mallinfo mi;
>
>	mi = mallinfo();
>
>	rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
>		getpid(), am_server ? "server " : "",
>		am_daemon ? "daemon " : "", who_am_i());
>	rprintf(FINFO, "  arena:     %10ld   (bytes from sbrk)\n",
>		(long)mi.arena);
>	rprintf(FINFO, "  ordblks:   %10ld   (chunks not in use)\n",
>		(long)mi.ordblks);
>	rprintf(FINFO, "  smblks:    %10ld\n",
>		(long)mi.smblks);
>	rprintf(FINFO, "  hblks:     %10ld   (chunks from mmap)\n",
>		(long)mi.hblks);
>	rprintf(FINFO, "  hblkhd:    %10ld   (bytes from mmap)\n",
>		(long)mi.hblkhd);
>	rprintf(FINFO, "  allmem:    %10ld   (bytes from sbrk + mmap)\n",
>		(long)mi.arena + mi.hblkhd);
>	rprintf(FINFO, "  usmblks:   %10ld\n",
>		(long)mi.usmblks);
>	rprintf(FINFO, "  fsmblks:   %10ld\n",
>		(long)mi.fsmblks);
>	rprintf(FINFO, "  uordblks:  %10ld   (bytes used)\n",
>		(long)mi.uordblks);
>	rprintf(FINFO, "  fordblks:  %10ld   (bytes free)\n",
>		(long)mi.fordblks);
>	rprintf(FINFO, "  keepcost:  %10ld   (bytes in releasable chunk)\n",
>		(long)mi.keepcost);
>#endif /* HAVE_MALLINFO */
>}
>
>
>/* Start the remote shell.   cmd may be NULL to use the default. */
>static pid_t do_cmd(char *cmd, char *machine, char *user, char *path,
>		    int *f_in, int *f_out)
>{
>	int i, argc = 0;
>	char *args[MAX_ARGS];
>	pid_t ret;
>	char *tok, *dir = NULL;
>	int dash_l_set = 0;
>
>	if (!read_batch && !local_server) {
>		char *rsh_env = getenv(RSYNC_RSH_ENV);
>		if (!cmd)
>			cmd = rsh_env;
>		if (!cmd)
>			cmd = RSYNC_RSH;
>		cmd = strdup(cmd);
>		if (!cmd)
>			goto oom;
>
>		for (tok = strtok(cmd, " "); tok; tok = strtok(NULL, " ")) {
>			/* Comparison leaves rooms for server_options(). */
>			if (argc >= MAX_ARGS - MAX_SERVER_ARGS) {
>				rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
>				exit_cleanup(RERR_SYNTAX);
>			}
>			args[argc++] = tok;
>		}
>
>		/* check to see if we've already been given '-l user' in
>		 * the remote-shell command */
>		for (i = 0; i < argc-1; i++) {
>			if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
>				dash_l_set = 1;
>		}
>
>#ifdef HAVE_REMSH
>		/* remsh (on HPUX) takes the arguments the other way around */
>		args[argc++] = machine;
>		if (user && !(daemon_over_rsh && dash_l_set)) {
>			args[argc++] = "-l";
>			args[argc++] = user;
>		}
>#else
>		if (user && !(daemon_over_rsh && dash_l_set)) {
>			args[argc++] = "-l";
>			args[argc++] = user;
>		}
>		args[argc++] = machine;
>#endif
>
>		args[argc++] = rsync_path;
>
>		if (blocking_io < 0) {
>			char *cp;
>			if ((cp = strrchr(cmd, '/')) != NULL)
>				cp++;
>			else
>				cp = cmd;
>			if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
>				blocking_io = 1;
>		}
>
>		server_options(args,&argc);
>
>		if (argc >= MAX_ARGS - 2) {
>			rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
>			exit_cleanup(RERR_SYNTAX);
>		}
>	}
>
>	args[argc++] = ".";
>
>	if (!daemon_over_rsh && path && *path)
>		args[argc++] = path;
>
>	args[argc] = NULL;
>
>	if (verbose > 3) {
>		rprintf(FINFO,"cmd=");
>		for (i = 0; i < argc; i++)
>			rprintf(FINFO, "%s ", safe_fname(args[i]));
>		rprintf(FINFO,"\n");
>	}
>
>	if (read_batch) {
>		int from_gen_pipe[2];
>		if (fd_pair(from_gen_pipe) < 0) {
>			rsyserr(FERROR, errno, "pipe");
>			exit_cleanup(RERR_IPC);
>		}
>		batch_gen_fd = from_gen_pipe[0];
>		*f_out = from_gen_pipe[1];
>		*f_in = batch_fd;
>		ret = -1; /* no child pid */
>	} else if (local_server) {
>		/* If the user didn't request --[no-]whole-file, force
>		 * it on, but only if we're not batch processing. */
>		if (whole_file < 0 && !write_batch)
>			whole_file = 1;
>		ret = local_child(argc, args, f_in, f_out, child_main);
>	} else
>		ret = piped_child(args,f_in,f_out);
>
>	if (dir)
>		free(dir);
>
>	return ret;
>
>oom:
>	out_of_memory("do_cmd");
>	return 0; /* not reached */
>}
>
>/*
> * The rsync receiving end operates in one of two modes:
> *
> * * In mode 1, it enters a directory and receives an unlimited number of files
> *   into the directory, placing them according to their names in the file list.
> *
> * * In mode 2, it receives a single file and names it according to the
> *   destination path, ignoring the file list.  This name is the "local name".
> *
> * The task of "get_local_name" is to decide on a mode and maybe a local name,
> * given the destination path.  It changes directory if necessary and then
> * returns the local name to indicate mode 2 or NULL to indicate mode 1.
> *
> * So that "default_mode_for_dir_acl" works correctly, the local name, if any,
> * must be a single path component so that "." is the containing directory.
> * This is the only reason I changed "get_local_name" at all.
> */
>static char *get_local_name(struct file_list *flist,char *dest_path)
>{
>	STRUCT_STAT st;
>
>	if (verbose > 2)
>		rprintf(FINFO,"get_local_name count=%d %s\n",
>			flist->count, NS(dest_path));
>
>	if (!dest_path)
>		return NULL;
>
>	/*
>	 * If the destination path refers to an existing directory, enter it and
>	 * use mode 1.  If there is something other than a directory at the
>	 * destination path, we had better be transferring only one file, and
>	 * that file will overwrite whatever is now at the destination path.
>	 */
>	if (do_lstat(dest_path, &st) == 0) {
>		if (S_ISDIR(st.st_mode)) {
>			if (!push_dir(dest_path)) {
>				rsyserr(FERROR, errno, "push_dir#1 %s failed",
>					full_fname(dest_path));
>				exit_cleanup(RERR_FILESELECT);
>			}
>			if (verbose > 2)
>				rprintf(FINFO,"entered existing destination directory %s\n",safe_fname(dest_path));
>			return NULL;
>		} else {
>			if (verbose > 2)
>				rprintf(FINFO,"destination is existing file %s -- might overwrite\n",safe_fname(dest_path));
>			if (flist->count > 1) {
>				rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
>				exit_cleanup(RERR_FILESELECT);
>			}
>		}
>	}
>	
>	/*
>	 * If the destination path ends in a slash or we are transferring
>	 * multiple files, create a directory at the destination path, enter the
>	 * new directory, and use mode 1.
>	 */
>	int len = strlen(dest_path);
>	if (flist->count > 1 || (len > 0 && dest_path[len-1] == '/')) {
>		/* Lop off the final slash if any. */
>		if (dest_path[len-1] == '/')
>			dest_path[len-1] = '\0';
>
>		/* Make the directory.  Set our umask back to normal for a
>		 * moment and supply 777 to mkdir so that either the umask or
>		 * the default ACL will take effect as appropriate. */
>		umask(orig_umask);
>		if (do_mkdir(dest_path, 0777) != 0) {
>			rsyserr(FERROR, errno, "mkdir %s failed", full_fname(dest_path));
>			exit_cleanup(RERR_FILEIO);
>		}
>		umask(0);
>
>		if (verbose > 0)
>			rprintf(FINFO, "created directory %s\n", safe_fname(dest_path));
>
>		/* If it's a dry run, we didn't really create anything; just succeed */
>		if (dry_run) {
>			dry_run++;
>			return NULL;
>		}
>
>		if (!push_dir(dest_path)) {
>			rsyserr(FERROR, errno, "push_dir#2 %s failed",
>				full_fname(dest_path));
>			exit_cleanup(RERR_FILESELECT);
>		}
>		if (verbose > 2)
>			rprintf(FINFO,"entered new destination directory %s\n",safe_fname(dest_path));
>
>		return NULL;
>	}
>	
>	/*
>	 * Otherwise, we are writing a single file, possibly on top of an
>	 * existing file that is not a directory.  Change to the containing
>	 * directory of the destination file, return the basename of the
>	 * destination file as the local name, and use mode 2.
>	 */
>	char *dest_path_1 = strdup(dest_path);
>	char *dest_path_2 = strdup(dest_path);
>
>	char *dest_dirname = dirname(dest_path_1);
>	char *dest_basename = basename(dest_path_2);
>
>	if (!push_dir(dest_dirname)) {
>		rsyserr(FERROR, errno, "push_dir#2.5 %s failed",
>			full_fname(dest_dirname));
>		exit_cleanup(RERR_FILESELECT);
>	}
>	if (verbose > 2)
>		rprintf(FINFO,"entered containing directory %s of destination file\n",safe_fname(dest_dirname));
>
>	free(dest_path_1);
>
>	/* dest_basename should be a suffix of dest_path.  Find the suffix. */
>	char *dest_basename_2 = dest_path + (len - strlen(dest_basename));
>	/* Check to make sure we got it. */
>	if (dest_basename_2 < dest_path || strcmp(dest_basename, dest_basename_2) != 0) {
>		rprintf(FERROR, "Uh-oh: Basename of the destination file isn't a suffix of the destination path!\n");
>		exit_cleanup(RERR_FILESELECT);
>	}
>
>	/* Now we can safely free dest_path_2 and return a pointer to memory
>	 * that won't get freed. */
>	free(dest_path_2);
>
>	if (verbose > 2)
>		rprintf(FINFO,"the local name is %s\n",safe_fname(dest_basename_2));
>
>	return dest_basename_2;
>}
>
>
>/* This is only called by the sender. */
>static void read_final_goodbye(int f_in, int f_out)
>{
>	int i;
>
>	if (protocol_version < 29)
>		i = read_int(f_in);
>	else {
>		while ((i = read_int(f_in)) == the_file_list->count
>		    && read_shortint(f_in) == ITEM_IS_NEW) {
>			/* Forward the keep-alive (no-op) to the receiver. */
>			write_int(f_out, the_file_list->count);
>			write_shortint(f_out, ITEM_IS_NEW);
>		}
>	}
>
>	if (i != -1) {
>		rprintf(FERROR, "Invalid packet at end of run (%d) [%s]\n",
>			i, who_am_i());
>		exit_cleanup(RERR_PROTOCOL);
>	}
>}
>
>
>static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
>{
>	int i;
>	struct file_list *flist;
>	char *dir = argv[0];
>
>	if (verbose > 2) {
>		rprintf(FINFO, "server_sender starting pid=%ld\n",
>			(long)getpid());
>	}
>
>	if (am_daemon && lp_write_only(module_id)) {
>		rprintf(FERROR, "ERROR: module is write only\n");
>		exit_cleanup(RERR_SYNTAX);
>		return;
>	}
>	if (am_daemon && lp_read_only(module_id) && remove_sent_files) {
>		rprintf(FERROR,
>		    "ERROR: --remove-sent-files cannot be used with a read-only module\n");
>		exit_cleanup(RERR_SYNTAX);
>		return;
>	}
>
>	if (!relative_paths && !push_dir(dir)) {
>		rsyserr(FERROR, errno, "push_dir#3 %s failed",
>			full_fname(dir));
>		exit_cleanup(RERR_FILESELECT);
>	}
>	argc--;
>	argv++;
>
>	if (strcmp(dir,".")) {
>		int l = strlen(dir);
>		if (strcmp(dir,"/") == 0)
>			l = 0;
>		for (i = 0; i < argc; i++)
>			argv[i] += l+1;
>	}
>
>	if (argc == 0 && (recurse || list_only)) {
>		argc = 1;
>		argv--;
>		argv[0] = ".";
>	}
>
>	flist = send_file_list(f_out,argc,argv);
>	if (!flist || flist->count == 0) {
>		exit_cleanup(0);
>	}
>	the_file_list = flist;
>
>	io_start_buffering_in();
>	io_start_buffering_out();
>
>	send_files(flist,f_out,f_in);
>	io_flush(FULL_FLUSH);
>	handle_stats(f_out);
>	if (protocol_version >= 24)
>		read_final_goodbye(f_in, f_out);
>	io_flush(FULL_FLUSH);
>	exit_cleanup(0);
>}
>
>
>static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
>{
>	int pid;
>	int status = 0;
>	int error_pipe[2];
>
>	/* The receiving side mustn't obey this, or an existing symlink that
>	 * points to an identical file won't be replaced by the referent. */
>	copy_links = 0;
>
>	if (preserve_hard_links)
>		init_hard_links();
>
>	if (fd_pair(error_pipe) < 0) {
>		rsyserr(FERROR, errno, "pipe failed in do_recv");
>		exit_cleanup(RERR_IPC);
>	}
>
>	io_flush(NORMAL_FLUSH);
>
>	if ((pid = do_fork()) == -1) {
>		rsyserr(FERROR, errno, "fork failed in do_recv");
>		exit_cleanup(RERR_IPC);
>	}
>
>	if (pid == 0) {
>		close(error_pipe[0]);
>		if (f_in != f_out)
>			close(f_out);
>
>		/* we can't let two processes write to the socket at one time */
>		close_multiplexing_out();
>
>		/* set place to send errors */
>		set_msg_fd_out(error_pipe[1]);
>
>		recv_files(f_in, flist, local_name);
>		io_flush(FULL_FLUSH);
>		handle_stats(f_in);
>
>		send_msg(MSG_DONE, "", 0);
>		io_flush(FULL_FLUSH);
>
>		/* Handle any keep-alive packets from the post-processing work
>		 * that the generator does. */
>		if (protocol_version >= 29) {
>			kluge_around_eof = -1;
>
>			/* This should only get stopped via a USR2 signal. */
>			while (read_int(f_in) == flist->count
>			    && read_shortint(f_in) == ITEM_IS_NEW) {}
>
>			rprintf(FERROR, "Invalid packet at end of run [%s]\n",
>				who_am_i());
>			exit_cleanup(RERR_PROTOCOL);
>		}
>
>		/* Finally, we go to sleep until our parent kills us with a
>		 * USR2 signal.  We sleep for a short time, as on some OSes
>		 * a signal won't interrupt a sleep! */
>		while (1)
>			msleep(20);
>	}
>
>	am_generator = 1;
>	close_multiplexing_in();
>	if (write_batch && !am_server)
>		stop_write_batch();
>
>	close(error_pipe[1]);
>	if (f_in != f_out)
>		close(f_in);
>
>	io_start_buffering_out();
>
>	set_msg_fd_in(error_pipe[0]);
>
>	generate_files(f_out, flist, local_name);
>
>	handle_stats(-1);
>	io_flush(FULL_FLUSH);
>	if (protocol_version >= 24) {
>		/* send a final goodbye message */
>		write_int(f_out, -1);
>	}
>	io_flush(FULL_FLUSH);
>
>	set_msg_fd_in(-1);
>	kill(pid, SIGUSR2);
>	wait_process(pid, &status);
>	return status;
>}
>
>
>static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
>{
>	int status;
>	struct file_list *flist;
>	char *local_name = NULL;
>	char *dir = NULL;
>	int save_verbose = verbose;
>
>	if (filesfrom_fd >= 0) {
>		/* We can't mix messages with files-from data on the socket,
>		 * so temporarily turn off verbose messages. */
>		verbose = 0;
>	}
>
>	if (verbose > 2) {
>		rprintf(FINFO, "server_recv(%d) starting pid=%ld\n",
>			argc, (long)getpid());
>	}
>
>	if (am_daemon && lp_read_only(module_id)) {
>		rprintf(FERROR,"ERROR: module is read only\n");
>		exit_cleanup(RERR_SYNTAX);
>		return;
>	}
>
>
>	if (argc > 0) {
>		dir = argv[0];
>		argc--;
>		argv++;
>		if (!am_daemon && !push_dir(dir)) {
>			rsyserr(FERROR, errno, "push_dir#4 %s failed",
>				full_fname(dir));
>			exit_cleanup(RERR_FILESELECT);
>		}
>	}
>
>	io_start_buffering_in();
>	recv_filter_list(f_in);
>
>	if (filesfrom_fd >= 0) {
>		/* We need to send the files-from names to the sender at the
>		 * same time that we receive the file-list from them, so we
>		 * need the IO routines to automatically write out the names
>		 * onto our f_out socket as we read the file-list.  This
>		 * avoids both deadlock and extra delays/buffers. */
>		io_set_filesfrom_fds(filesfrom_fd, f_out);
>		filesfrom_fd = -1;
>	}
>
>	flist = recv_file_list(f_in);
>	verbose = save_verbose;
>	if (!flist) {
>		rprintf(FERROR,"server_recv: recv_file_list error\n");
>		exit_cleanup(RERR_FILESELECT);
>	}
>	the_file_list = flist;
>
>	if (argc > 0) {
>		if (strcmp(dir,".")) {
>			argv[0] += strlen(dir);
>			if (argv[0][0] == '/')
>				argv[0]++;
>		}
>		local_name = get_local_name(flist,argv[0]);
>	}
>
>	status = do_recv(f_in,f_out,flist,local_name);
>	exit_cleanup(status);
>}
>
>
>int child_main(int argc, char *argv[])
>{
>	start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
>	return 0;
>}
>
>
>void start_server(int f_in, int f_out, int argc, char *argv[])
>{
>	set_nonblocking(f_in);
>	set_nonblocking(f_out);
>
>	io_set_sock_fds(f_in, f_out);
>	setup_protocol(f_out, f_in);
>
>	if (protocol_version >= 23)
>		io_start_multiplex_out();
>
>	if (am_sender) {
>		keep_dirlinks = 0; /* Must be disabled on the sender. */
>		if (need_messages_from_generator)
>			io_start_multiplex_in();
>
>		recv_filter_list(f_in);
>		do_server_sender(f_in, f_out, argc, argv);
>	} else {
>		do_server_recv(f_in, f_out, argc, argv);
>	}
>	exit_cleanup(0);
>}
>
>
>/*
> * This is called once the connection has been negotiated.  It is used
> * for rsyncd, remote-shell, and local connections.
> */
>int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
>{
>	struct file_list *flist = NULL;
>	int status = 0, status2 = 0;
>	char *local_name = NULL;
>
>	cleanup_child_pid = pid;
>	if (!read_batch) {
>		set_nonblocking(f_in);
>		set_nonblocking(f_out);
>	}
>
>	io_set_sock_fds(f_in, f_out);
>	setup_protocol(f_out,f_in);
>
>	if (protocol_version >= 23 && !read_batch)
>		io_start_multiplex_in();
>
>	/* We set our stderr file handle to blocking because ssh might have
>	 * set it to non-blocking.  This can be particularly troublesome if
>	 * stderr is a clone of stdout, because ssh would have set our stdout
>	 * to non-blocking at the same time (which can easily cause us to lose
>	 * output from our print statements).  This kluge shouldn't cause ssh
>	 * any problems for how we use it.  Note also that we delayed setting
>	 * this until after the above protocol setup so that we know for sure
>	 * that ssh is done twiddling its file descriptors.  */
>	set_blocking(STDERR_FILENO);
>
>	if (am_sender) {
>		keep_dirlinks = 0; /* Must be disabled on the sender. */
>		io_start_buffering_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");
>		the_file_list = flist;
>
>		io_flush(NORMAL_FLUSH);
>		send_files(flist,f_out,f_in);
>		io_flush(FULL_FLUSH);
>		handle_stats(-1);
>		if (protocol_version >= 24)
>			read_final_goodbye(f_in, f_out);
>		if (pid != -1) {
>			if (verbose > 3)
>				rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
>			io_flush(FULL_FLUSH);
>			wait_process(pid, &status);
>		}
>		output_summary();
>		io_flush(FULL_FLUSH);
>		exit_cleanup(status);
>	}
>
>	if (need_messages_from_generator && !read_batch)
>		io_start_multiplex_out();
>
>	if (argc == 0)
>		list_only |= 1;
>
>	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);
>	the_file_list = flist;
>
>	if (flist && flist->count > 0) {
>		local_name = get_local_name(flist, argv[0]);
>
>		status2 = do_recv(f_in, f_out, flist, 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(pid, &status);
>	}
>
>	return MAX(status, status2);
>}
>
>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;
>	char *shell_machine = NULL;
>	char *shell_path = NULL;
>	char *shell_user = NULL;
>	int ret;
>	pid_t pid;
>	int f_in,f_out;
>	int rc;
>
>	/* Don't clobber argv[] so that ps(1) can still show the right
>	 * command line. */
>	if ((rc = copy_argv(argv)))
>		return rc;
>
>	if (!read_batch) { /* for read_batch, NO source is specified */
>		argc--;
>		shell_path = check_for_hostspec(argv[0], &shell_machine, &rsync_port);
>		if (shell_path) { /* source is remote */
>			argv++;
>			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);
>			}
>			if (rsync_port) {
>				if (!shell_cmd) {
>					return start_socket_client(shell_machine,
>								   shell_path,
>								   argc, argv);
>				}
>				daemon_over_rsh = 1;
>			}
>
>			am_sender = 0;
>		} else { /* source is local, check dest arg */
>			am_sender = 1;
>
>			if (argc < 1) { /* destination required */
>				usage(FERROR);
>				exit_cleanup(RERR_SYNTAX);
>			}
>
>			shell_path = check_for_hostspec(argv[argc], &shell_machine, &rsync_port);
>			if (shell_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 (!shell_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;
>				shell_path = argv[argc];
>			} else if (rsync_port) {
>				if (!shell_cmd) {
>					return start_socket_client(shell_machine,
>								   shell_path,
>								   argc, argv);
>				}
>				daemon_over_rsh = 1;
>			}
>		}
>	} else {  /* read_batch */
>		local_server = 1;
>		shell_path = argv[argc-1];
>		if (check_for_hostspec(shell_path, &shell_machine, &rsync_port)) {
>			rprintf(FERROR, "remote destination is not allowed with --read-batch\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",
>			shell_cmd ? safe_fname(shell_cmd) : "",
>			shell_machine ? safe_fname(shell_machine) : "",
>			shell_user ? safe_fname(shell_user) : "",
>			shell_path ? safe_fname(shell_path) : "");
>	}
>
>	/* for remote source, only single dest arg can remain ... */
>	if (!am_sender && argc > 1) {
>		usage(FERROR);
>		exit_cleanup(RERR_SYNTAX);
>	}
>
>	/* ... or no dest at all */
>	if (!am_sender && argc == 0)
>		list_only |= 1;
>
>	pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
>		     &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(shell_user, shell_path,
>					       f_in, f_out, argc);
>		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_SIGNAL);
>}
>
>static RETSIGTYPE sigusr2_handler(UNUSED(int val))
>{
>	if (!am_server)
>		output_summary();
>	close_all();
>	if (log_got_error)
>		_exit(RERR_PARTIAL);
>	_exit(0);
>}
>
>static RETSIGTYPE sigchld_handler(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
>}
>
>
>/**
> * 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;
>
>	sprintf(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;
>
>	signal(SIGUSR1, sigusr1_handler);
>	signal(SIGUSR2, sigusr2_handler);
>	signal(SIGCHLD, sigchld_handler);
>#ifdef MAINTAINER_MODE
>	signal(SIGSEGV, rsync_panic_handler);
>	signal(SIGFPE, rsync_panic_handler);
>	signal(SIGABRT, rsync_panic_handler);
>	signal(SIGBUS, rsync_panic_handler);
>#endif /* def MAINTAINER_MODE */
>
>	starttime = time(NULL);
>	am_root = (MY_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 = (int)umask(0);
>
>	if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
>		/* FIXME: We ought to call the same error-handling
>		 * code here, rather than relying on getopt. */
>		option_error();
>		exit_cleanup(RERR_SYNTAX);
>	}
>
>	signal(SIGINT,SIGNAL_CAST sig_int);
>	signal(SIGHUP,SIGNAL_CAST sig_int);
>	signal(SIGTERM,SIGNAL_CAST sig_int);
>
>	/* Ignore SIGPIPE; we consistently check error codes and will
>	 * see the EPIPE. */
>	signal(SIGPIPE, SIG_IGN);
>
>#if defined CONFIG_LOCALE && defined HAVE_SETLOCALE
>	setlocale(LC_CTYPE, "");
>#endif
>
>	/* Initialize push_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. */
>	push_dir(NULL);
>
>	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);
>	}
>	if (write_batch < 0)
>		dry_run = 1;
>
>	if (am_daemon && !am_server)
>		return daemon_main();
>
>	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;
>}

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Attachments on bug 3392: 1661