Attachment 2873 Details for Bug 4899 – Suggested solution of the bug

Suggested solution of the bug

flist.c (text/plain), 47.63 KB, created by David Pei on 2007-08-20 02:51:03 UTC

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Creator: David Pei

Created: 2007-08-20 02:51:03 UTC

Size: 47.63 KB

patch

obsolete

>/*
> * Generate and receive file lists.
> *
> * Copyright (C) 1996 Andrew Tridgell
> * Copyright (C) 1996 Paul Mackerras
> * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
> * Copyright (C) 2002, 2003, 2004, 2005, 2006 Wayne Davison
> *
> * 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.,
> * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
> */
>
>#include "rsync.h"
>
>extern int verbose;
>extern int list_only;
>extern int am_root;
>extern int am_server;
>extern int am_daemon;
>extern int am_sender;
>extern int do_progress;
>extern int always_checksum;
>extern int module_id;
>extern int ignore_errors;
>extern int numeric_ids;
>extern int recurse;
>extern int xfer_dirs;
>extern int filesfrom_fd;
>extern int one_file_system;
>extern int copy_dirlinks;
>extern int keep_dirlinks;
>extern int preserve_links;
>extern int preserve_hard_links;
>extern int preserve_devices;
>extern int preserve_specials;
>extern int preserve_uid;
>extern int preserve_gid;
>extern int relative_paths;
>extern int implied_dirs;
>extern int prune_empty_dirs;
>extern int copy_links;
>extern int copy_unsafe_links;
>extern int protocol_version;
>extern int sanitize_paths;
>extern struct stats stats;
>extern struct file_list *the_file_list;
>
>extern char curr_dir[MAXPATHLEN];
>
>extern struct chmod_mode_struct *chmod_modes;
>
>extern struct filter_list_struct filter_list;
>extern struct filter_list_struct server_filter_list;
>
>int io_error;
>int checksum_len;
>dev_t filesystem_dev; /* used to implement -x */
>unsigned int file_struct_len;
>
>static char empty_sum[MD4_SUM_LENGTH];
>static int flist_count_offset;
>
>static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
>static void output_flist(struct file_list *flist);
>
>void init_flist(void)
>{
>	struct file_struct f;
>
>	/* Figure out how big the file_struct is without trailing padding */
>	file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
>	checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
>}
>
>static int show_filelist_p(void)
>{
>	return verbose && xfer_dirs && !am_server;
>}
>
>static void start_filelist_progress(char *kind)
>{
>	rprintf(FCLIENT, "%s ... ", kind);
>	if (verbose > 1 || do_progress)
>		rprintf(FCLIENT, "\n");
>	rflush(FINFO);
>}
>
>static void emit_filelist_progress(int count)
>{
>	rprintf(FCLIENT, " %d files...\r", count);
>}
>
>static void maybe_emit_filelist_progress(int count)
>{
>	if (do_progress && show_filelist_p() && (count % 100) == 0)
>		emit_filelist_progress(count);
>}
>
>static void finish_filelist_progress(const struct file_list *flist)
>{
>	if (do_progress) {
>		/* This overwrites the progress line */
>		rprintf(FINFO, "%d file%sto consider\n",
>			flist->count, flist->count == 1 ? " " : "s ");
>	} else
>		rprintf(FINFO, "done\n");
>}
>
>void show_flist_stats(void)
>{
>	/* Nothing yet */
>}
>
>static void list_file_entry(struct file_struct *f)
>{
>	char permbuf[PERMSTRING_SIZE];
>
>	if (!f->basename) {
>		/* this can happen if duplicate names were removed */
>		return;
>	}
>
>	permstring(permbuf, f->mode);
>
>#ifdef SUPPORT_LINKS
>	if (preserve_links && S_ISLNK(f->mode)) {
>		rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
>			permbuf,
>			(double)f->length, timestring(f->modtime),
>			f_name(f, NULL), f->u.link);
>	} else
>#endif
>	{
>		rprintf(FINFO, "%s %11.0f %s %s\n",
>			permbuf,
>			(double)f->length, timestring(f->modtime),
>			f_name(f, NULL));
>	}
>}
>
>/* Stat either a symlink or its referent, depending on the settings of
> * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
> *
> * If path is the name of a symlink, then the linkbuf buffer (which must hold
> * MAXPATHLEN chars) will be set to the symlink's target string.
> *
> * The stat structure pointed to by stp will contain information about the
> * link or the referent as appropriate, if they exist. */
>static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
>{
>#ifdef SUPPORT_LINKS
>	if (link_stat(path, stp, copy_dirlinks) < 0)
>		return -1;
>	if (S_ISLNK(stp->st_mode)) {
>		int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
>		if (llen < 0)
>			return -1;
>		linkbuf[llen] = '\0';
>		if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
>			if (verbose > 1) {
>				rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
>					path, linkbuf);
>			}
>			return do_stat(path, stp);
>		}
>	}
>	return 0;
>#else
>	return do_stat(path, stp);
>#endif
>}
>
>int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
>{
>#ifdef SUPPORT_LINKS
>	if (copy_links)
>		return do_stat(path, stp);
>	if (do_lstat(path, stp) < 0)
>		return -1;
>	if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
>		STRUCT_STAT st;
>		if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
>			*stp = st;
>	}
>	return 0;
>#else
>	return do_stat(path, stp);
>#endif
>}
>
>/* This function is used to check if a file should be included/excluded
> * from the list of files based on its name and type etc.  The value of
> * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
>static int is_excluded(char *fname, int is_dir, int filter_level)
>{
>#if 0 /* This currently never happens, so avoid a useless compare. */
>	if (filter_level == NO_FILTERS)
>		return 0;
>#endif
>	if (fname) {
>		/* never exclude '.', even if somebody does --exclude '*' */
>		if (fname[0] == '.' && !fname[1])
>			return 0;
>		/* Handle the -R version of the '.' dir. */
>		if (fname[0] == '/') {
>			int len = strlen(fname);
>			if (fname[len-1] == '.' && fname[len-2] == '/')
>				return 0;
>		}
>	}
>	if (server_filter_list.head
>	    && check_filter(&server_filter_list, fname, is_dir) < 0)
>		return 1;
>	if (filter_level != ALL_FILTERS)
>		return 0;
>	if (filter_list.head
>	    && check_filter(&filter_list, fname, is_dir) < 0)
>		return 1;
>	return 0;
>}
>
>static int to_wire_mode(mode_t mode)
>{
>#ifdef SUPPORT_LINKS
>#if _S_IFLNK != 0120000
>	if (S_ISLNK(mode))
>		return (mode & ~(_S_IFMT)) | 0120000;
>#endif
>#endif
>	return mode;
>}
>
>static mode_t from_wire_mode(int mode)
>{
>#if _S_IFLNK != 0120000
>	if ((mode & (_S_IFMT)) == 0120000)
>		return (mode & ~(_S_IFMT)) | _S_IFLNK;
>#endif
>	return mode;
>}
>
>static void send_directory(int f, struct file_list *flist,
>			   char *fbuf, int len);
>
>static char *flist_dir;
>static int flist_dir_len;
>
>
>/**
> * Make sure @p flist is big enough to hold at least @p flist->count
> * entries.
> **/
>void flist_expand(struct file_list *flist)
>{
>	struct file_struct **new_ptr;
>
>	if (flist->count < flist->malloced)
>		return;
>
>	if (flist->malloced < FLIST_START)
>		flist->malloced = FLIST_START;
>	else if (flist->malloced >= FLIST_LINEAR)
>		flist->malloced += FLIST_LINEAR;
>	else
>		flist->malloced *= 2;
>
>	/*
>	 * In case count jumped or we are starting the list
>	 * with a known size just set it.
>	 */
>	if (flist->malloced < flist->count)
>		flist->malloced = flist->count;
>
>	new_ptr = realloc_array(flist->files, struct file_struct *,
>				flist->malloced);
>
>	if (verbose >= 2 && flist->malloced != FLIST_START) {
>		rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
>		    who_am_i(),
>		    (double)sizeof flist->files[0] * flist->malloced,
>		    (new_ptr == flist->files) ? " not" : "");
>	}
>
>	flist->files = new_ptr;
>
>	if (!flist->files)
>		out_of_memory("flist_expand");
>}
>
>static void send_file_entry(struct file_struct *file, int f)
>{
>	unsigned short flags;
>	static time_t modtime;
>	static mode_t mode;
>	static int64 dev;
>	static dev_t rdev;
>	static uint32 rdev_major;
>	static uid_t uid;
>	static gid_t gid;
>	static char lastname[MAXPATHLEN];
>	char fname[MAXPATHLEN];
>	int l1, l2;
>
>	if (f < 0)
>		return;
>
>	if (!file) {
>		write_byte(f, 0);
>		modtime = 0, mode = 0;
>		dev = 0, rdev = MAKEDEV(0, 0);
>		rdev_major = 0;
>		uid = 0, gid = 0;
>		*lastname = '\0';
>		return;
>	}
>
>	f_name(file, fname);
>
>	flags = file->flags & XMIT_TOP_DIR;
>
>	if (file->mode == mode)
>		flags |= XMIT_SAME_MODE;
>	else
>		mode = file->mode;
>	if ((preserve_devices && IS_DEVICE(mode))
>	 || (preserve_specials && IS_SPECIAL(mode))) {
>		if (protocol_version < 28) {
>			if (file->u.rdev == rdev)
>				flags |= XMIT_SAME_RDEV_pre28;
>			else
>				rdev = file->u.rdev;
>		} else {
>			rdev = file->u.rdev;
>			if ((uint32)major(rdev) == rdev_major)
>				flags |= XMIT_SAME_RDEV_MAJOR;
>			else
>				rdev_major = major(rdev);
>			if ((uint32)minor(rdev) <= 0xFFu)
>				flags |= XMIT_RDEV_MINOR_IS_SMALL;
>		}
>	} else if (protocol_version < 28)
>		rdev = MAKEDEV(0, 0);
>	if (file->uid == uid)
>		flags |= XMIT_SAME_UID;
>	else
>		uid = file->uid;
>	if (file->gid == gid)
>		flags |= XMIT_SAME_GID;
>	else
>		gid = file->gid;
>	if (file->modtime == modtime)
>		flags |= XMIT_SAME_TIME;
>	else
>		modtime = file->modtime;
>
>#ifdef SUPPORT_HARD_LINKS
>	if (file->link_u.idev) {
>		if (file->F_DEV == dev) {
>			if (protocol_version >= 28)
>				flags |= XMIT_SAME_DEV;
>		} else
>			dev = file->F_DEV;
>		flags |= XMIT_HAS_IDEV_DATA;
>	}
>#endif
>
>	for (l1 = 0;
>	    lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
>	    l1++) {}
>	l2 = strlen(fname+l1);
>
>	if (l1 > 0)
>		flags |= XMIT_SAME_NAME;
>	if (l2 > 255)
>		flags |= XMIT_LONG_NAME;
>
>	/* We must make sure we don't send a zero flag byte or the
>	 * other end will terminate the flist transfer.  Note that
>	 * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
>	 * it's harmless way to add a bit to the first flag byte. */
>	if (protocol_version >= 28) {
>		if (!flags && !S_ISDIR(mode))
>			flags |= XMIT_TOP_DIR;
>		if ((flags & 0xFF00) || !flags) {
>			flags |= XMIT_EXTENDED_FLAGS;
>			write_byte(f, flags);
>			write_byte(f, flags >> 8);
>		} else
>			write_byte(f, flags);
>	} else {
>		if (!(flags & 0xFF))
>			flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
>		write_byte(f, flags);
>	}
>	if (flags & XMIT_SAME_NAME)
>		write_byte(f, l1);
>	if (flags & XMIT_LONG_NAME)
>		write_int(f, l2);
>	else
>		write_byte(f, l2);
>	write_buf(f, fname + l1, l2);
>
>	write_longint(f, file->length);
>	if (!(flags & XMIT_SAME_TIME))
>		write_int(f, modtime);
>	if (!(flags & XMIT_SAME_MODE))
>		write_int(f, to_wire_mode(mode));
>	if (preserve_uid && !(flags & XMIT_SAME_UID)) {
>		if (!numeric_ids)
>			add_uid(uid);
>		write_int(f, uid);
>	}
>	if (preserve_gid && !(flags & XMIT_SAME_GID)) {
>		if (!numeric_ids)
>			add_gid(gid);
>		write_int(f, gid);
>	}
>	if ((preserve_devices && IS_DEVICE(mode))
>	 || (preserve_specials && IS_SPECIAL(mode))) {
>		if (protocol_version < 28) {
>			if (!(flags & XMIT_SAME_RDEV_pre28))
>				write_int(f, (int)rdev);
>		} else {
>			if (!(flags & XMIT_SAME_RDEV_MAJOR))
>				write_int(f, major(rdev));
>			if (flags & XMIT_RDEV_MINOR_IS_SMALL)
>				write_byte(f, minor(rdev));
>			else
>				write_int(f, minor(rdev));
>		}
>	}
>
>#ifdef SUPPORT_LINKS
>	if (preserve_links && S_ISLNK(mode)) {
>		int len = strlen(file->u.link);
>		write_int(f, len);
>		write_buf(f, file->u.link, len);
>	}
>#endif
>
>#ifdef SUPPORT_HARD_LINKS
>	if (file->link_u.idev) {
>		if (protocol_version < 26) {
>			/* 32-bit dev_t and ino_t */
>			write_int(f, dev);
>			write_int(f, file->F_INODE);
>		} else {
>			/* 64-bit dev_t and ino_t */
>			if (!(flags & XMIT_SAME_DEV))
>				write_longint(f, dev);
>			write_longint(f, file->F_INODE);
>		}
>	}
>#endif
>
>	if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
>		char *sum;
>		if (S_ISREG(mode))
>			sum = file->u.sum;
>		else {
>			/* Prior to 28, we sent a useless set of nulls. */
>			sum = empty_sum;
>		}
>		write_buf(f, sum, checksum_len);
>	}
>
>	strlcpy(lastname, fname, MAXPATHLEN);
>}
>
>static struct file_struct *receive_file_entry(struct file_list *flist,
>					      unsigned short flags, int f)
>{
>	static time_t modtime;
>	static mode_t mode;
>	static int64 dev;
>	static dev_t rdev;
>	static uint32 rdev_major;
>	static uid_t uid;
>	static gid_t gid;
>	static char lastname[MAXPATHLEN], *lastdir;
>	static int lastdir_depth, lastdir_len = -1;
>	static unsigned int del_hier_name_len = 0;
>	static int in_del_hier = 0;
>	char thisname[MAXPATHLEN];
>	unsigned int l1 = 0, l2 = 0;
>	int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
>	OFF_T file_length;
>	char *basename, *dirname, *bp;
>	struct file_struct *file;
>
>	if (!flist) {
>		modtime = 0, mode = 0;
>		dev = 0, rdev = MAKEDEV(0, 0);
>		rdev_major = 0;
>		uid = 0, gid = 0;
>		*lastname = '\0';
>		lastdir_len = -1;
>		in_del_hier = 0;
>		return NULL;
>	}
>
>	if (flags & XMIT_SAME_NAME)
>		l1 = read_byte(f);
>
>	if (flags & XMIT_LONG_NAME)
>		l2 = read_int(f);
>	else
>		l2 = read_byte(f);
>
>	if (l2 >= MAXPATHLEN - l1) {
>		rprintf(FERROR,
>			"overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
>			flags, l1, l2, lastname);
>		overflow_exit("receive_file_entry");
>	}
>
>	strlcpy(thisname, lastname, l1 + 1);
>	read_sbuf(f, &thisname[l1], l2);
>	thisname[l1 + l2] = 0;
>
>	strlcpy(lastname, thisname, MAXPATHLEN);
>
>	clean_fname(thisname, 0);
>
>	if (sanitize_paths)
>		sanitize_path(thisname, thisname, "", 0, NULL);
>
>	if ((basename = strrchr(thisname, '/')) != NULL) {
>		dirname_len = ++basename - thisname; /* counts future '\0' */
>		if (lastdir_len == dirname_len - 1
>		    && strncmp(thisname, lastdir, lastdir_len) == 0) {
>			dirname = lastdir;
>			dirname_len = 0; /* indicates no copy is needed */
>		} else
>			dirname = thisname;
>	} else {
>		basename = thisname;
>		dirname = NULL;
>		dirname_len = 0;
>	}
>	basename_len = strlen(basename) + 1; /* count the '\0' */
>
>	file_length = read_longint(f);
>	if (!(flags & XMIT_SAME_TIME))
>		modtime = (time_t)read_int(f);
>	if (!(flags & XMIT_SAME_MODE))
>		mode = from_wire_mode(read_int(f));
>
>	if (chmod_modes && !S_ISLNK(mode))
>		mode = tweak_mode(mode, chmod_modes);
>
>	if (preserve_uid && !(flags & XMIT_SAME_UID))
>		uid = (uid_t)read_int(f);
>	if (preserve_gid && !(flags & XMIT_SAME_GID))
>		gid = (gid_t)read_int(f);
>
>	if ((preserve_devices && IS_DEVICE(mode))
>	 || (preserve_specials && IS_SPECIAL(mode))) {
>		if (protocol_version < 28) {
>			if (!(flags & XMIT_SAME_RDEV_pre28))
>				rdev = (dev_t)read_int(f);
>		} else {
>			uint32 rdev_minor;
>			if (!(flags & XMIT_SAME_RDEV_MAJOR))
>				rdev_major = read_int(f);
>			if (flags & XMIT_RDEV_MINOR_IS_SMALL)
>				rdev_minor = read_byte(f);
>			else
>				rdev_minor = read_int(f);
>			rdev = MAKEDEV(rdev_major, rdev_minor);
>		}
>	} else if (protocol_version < 28)
>		rdev = MAKEDEV(0, 0);
>
>#ifdef SUPPORT_LINKS
>	if (preserve_links && S_ISLNK(mode)) {
>		linkname_len = read_int(f) + 1; /* count the '\0' */
>		if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
>			rprintf(FERROR, "overflow: linkname_len=%d\n",
>				linkname_len - 1);
>			overflow_exit("receive_file_entry");
>		}
>	}
>	else
>#endif
>		linkname_len = 0;
>
>	sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
>
>	alloc_len = file_struct_len + dirname_len + basename_len
>		  + linkname_len + sum_len;
>	bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
>
>	file = (struct file_struct *)bp;
>	memset(bp, 0, file_struct_len);
>	bp += file_struct_len;
>
>	file->modtime = modtime;
>	file->length = file_length;
>	file->mode = mode;
>	file->uid = uid;
>	file->gid = gid;
>
>	if (dirname_len) {
>		file->dirname = lastdir = bp;
>		lastdir_len = dirname_len - 1;
>		memcpy(bp, dirname, dirname_len - 1);
>		bp += dirname_len;
>		bp[-1] = '\0';
>		lastdir_depth = count_dir_elements(lastdir);
>		file->dir.depth = lastdir_depth + 1;
>	} else if (dirname) {
>		file->dirname = dirname; /* we're reusing lastname */
>		file->dir.depth = lastdir_depth + 1;
>	} else
>		file->dir.depth = 1;
>
>	if (S_ISDIR(mode)) {
>		if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
>			file->dir.depth--;
>		if (flags & XMIT_TOP_DIR) {
>			in_del_hier = recurse;
>			del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
>			if (relative_paths && del_hier_name_len > 2
>			    && lastname[del_hier_name_len-1] == '.'
>			    && lastname[del_hier_name_len-2] == '/')
>				del_hier_name_len -= 2;
>			file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
>		} else if (in_del_hier) {
>			if (!relative_paths || !del_hier_name_len
>			 || (l1 >= del_hier_name_len
>			  && lastname[del_hier_name_len] == '/'))
>				file->flags |= FLAG_DEL_HERE;
>			else
>				in_del_hier = 0;
>		}
>	}
>
>	file->basename = bp;
>	memcpy(bp, basename, basename_len);
>	bp += basename_len;
>
>	if ((preserve_devices && IS_DEVICE(mode))
>	 || (preserve_specials && IS_SPECIAL(mode)))
>		file->u.rdev = rdev;
>
>#ifdef SUPPORT_LINKS
>	if (linkname_len) {
>		file->u.link = bp;
>		read_sbuf(f, bp, linkname_len - 1);
>		if (sanitize_paths)
>			sanitize_path(bp, bp, "", lastdir_depth, NULL);
>		bp += linkname_len;
>	}
>#endif
>
>#ifdef SUPPORT_HARD_LINKS
>	if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
>		flags |= XMIT_HAS_IDEV_DATA;
>	if (flags & XMIT_HAS_IDEV_DATA) {
>		int64 inode;
>		if (protocol_version < 26) {
>			dev = read_int(f);
>			inode = read_int(f);
>		} else {
>			if (!(flags & XMIT_SAME_DEV))
>				dev = read_longint(f);
>			inode = read_longint(f);
>		}
>		if (flist->hlink_pool) {
>			file->link_u.idev = pool_talloc(flist->hlink_pool,
>			    struct idev, 1, "inode_table");
>			file->F_INODE = inode;
>			file->F_DEV = dev;
>		}
>	}
>#endif
>
>	if (always_checksum && (sum_len || protocol_version < 28)) {
>		char *sum;
>		if (sum_len) {
>			file->u.sum = sum = bp;
>			/*bp += sum_len;*/
>		} else {
>			/* Prior to 28, we get a useless set of nulls. */
>			sum = empty_sum;
>		}
>		read_buf(f, sum, checksum_len);
>	}
>
>	return file;
>}
>
>/**
> * Create a file_struct for a named file by reading its stat()
> * information and performing extensive checks against global
> * options.
> *
> * @return the new file, or NULL if there was an error or this file
> * should be excluded.
> *
> * @todo There is a small optimization opportunity here to avoid
> * stat()ing the file in some circumstances, which has a certain cost.
> * We are called immediately after doing readdir(), and so we may
> * already know the d_type of the file.  We could for example avoid
> * statting directories if we're not recursing, but this is not a very
> * important case.  Some systems may not have d_type.
> **/
>struct file_struct *make_file(char *fname, struct file_list *flist,
>			      STRUCT_STAT *stp, unsigned short flags,
>			      int filter_level)
>{
>	static char *lastdir;
>	static int lastdir_len = -1;
>	struct file_struct *file;
>	STRUCT_STAT st;
>	char sum[SUM_LENGTH];
>	char thisname[MAXPATHLEN];
>	char linkname[MAXPATHLEN];
>	int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
>	char *basename, *dirname, *bp;
>
>	if (!flist || !flist->count)	/* Ignore lastdir when invalid. */
>		lastdir_len = -1;
>
>	if (strlcpy(thisname, fname, sizeof thisname)
>	    >= sizeof thisname - flist_dir_len) {
>		rprintf(FINFO, "skipping overly long name: %s\n", fname);
>		return NULL;
>	}
>	clean_fname(thisname, 0);
>	if (sanitize_paths)
>		sanitize_path(thisname, thisname, "", 0, NULL);
>
>	memset(sum, 0, SUM_LENGTH);
>
>	/* In case a mounted dir crashed, than stat will hang there even
>	   the dir has been filtered */
>	if (filter_level != NO_FILTERS
>            && is_excluded(thisname, 1, filter_level)) {
>		rprintf(FINFO, "Excluding %s\n", thisname);
>		return NULL; 
>	} else if (stp && S_ISDIR(stp->st_mode)) {
>		st = *stp; /* Needed for "symlink/." with --relative. */
>		*linkname = '\0'; /* make IBM code checker happy */
>	} else if (readlink_stat(thisname, &st, linkname) != 0) {
>		int save_errno = errno;
>		/* See if file is excluded before reporting an error. */
>		if (filter_level != NO_FILTERS
>		    && is_excluded(thisname, 0, filter_level))
>			return NULL;
>		if (save_errno == ENOENT) {
>#ifdef SUPPORT_LINKS
>			/* Avoid "vanished" error if symlink points nowhere. */
>			if (copy_links && do_lstat(thisname, &st) == 0
>			    && S_ISLNK(st.st_mode)) {
>				io_error |= IOERR_GENERAL;
>				rprintf(FERROR, "symlink has no referent: %s\n",
>					full_fname(thisname));
>			} else
>#endif
>			{
>				enum logcode c = am_daemon && protocol_version < 28
>				    ? FERROR : FINFO;
>				io_error |= IOERR_VANISHED;
>				rprintf(c, "file has vanished: %s\n",
>					full_fname(thisname));
>			}
>		} else {
>			io_error |= IOERR_GENERAL;
>			rsyserr(FERROR, save_errno, "readlink %s failed",
>				full_fname(thisname));
>		}
>		return NULL;
>	}
>
>	/* backup.c calls us with filter_level set to NO_FILTERS. */
>	if (filter_level == NO_FILTERS)
>		goto skip_filters;
>
>	if (S_ISDIR(st.st_mode) && !xfer_dirs) {
>		rprintf(FINFO, "skipping directory %s\n", thisname);
>		return NULL;
>	}
>
>	/* We only care about directories because we need to avoid recursing
>	 * into a mount-point directory, not to avoid copying a symlinked
>	 * file if -L (or similar) was specified. */
>	if (one_file_system && st.st_dev != filesystem_dev
>	 && S_ISDIR(st.st_mode)) {
>		if (one_file_system > 1) {
>			if (verbose > 2) {
>				rprintf(FINFO, "skipping mount-point dir %s\n",
>					thisname);
>			}
>			return NULL;
>		}
>		flags |= FLAG_MOUNT_POINT;
>	}
>
>	if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
>		return NULL;
>
>	if (lp_ignore_nonreadable(module_id)) {
>#ifdef SUPPORT_LINKS
>		if (!S_ISLNK(st.st_mode))
>#endif
>			if (access(thisname, R_OK) != 0)
>				return NULL;
>	}
>
>  skip_filters:
>
>	if (verbose > 2) {
>		rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
>			who_am_i(), thisname, filter_level);
>	}
>
>	if ((basename = strrchr(thisname, '/')) != NULL) {
>		dirname_len = ++basename - thisname; /* counts future '\0' */
>		if (lastdir_len == dirname_len - 1
>		    && strncmp(thisname, lastdir, lastdir_len) == 0) {
>			dirname = lastdir;
>			dirname_len = 0; /* indicates no copy is needed */
>		} else
>			dirname = thisname;
>	} else {
>		basename = thisname;
>		dirname = NULL;
>		dirname_len = 0;
>	}
>	basename_len = strlen(basename) + 1; /* count the '\0' */
>
>#ifdef SUPPORT_LINKS
>	linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
>#else
>	linkname_len = 0;
>#endif
>
>	sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
>	        ? MD4_SUM_LENGTH : 0;
>
>	alloc_len = file_struct_len + dirname_len + basename_len
>		  + linkname_len + sum_len;
>	if (flist)
>		bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
>	else {
>		if (!(bp = new_array(char, alloc_len)))
>			out_of_memory("make_file");
>	}
>
>	file = (struct file_struct *)bp;
>	memset(bp, 0, file_struct_len);
>	bp += file_struct_len;
>
>	file->flags = flags;
>	file->modtime = st.st_mtime;
>	file->length = st.st_size;
>	file->mode = st.st_mode;
>	file->uid = st.st_uid;
>	file->gid = st.st_gid;
>
>#ifdef SUPPORT_HARD_LINKS
>	if (flist && flist->hlink_pool) {
>		if (protocol_version < 28) {
>			if (S_ISREG(st.st_mode))
>				file->link_u.idev = pool_talloc(
>				    flist->hlink_pool, struct idev, 1,
>				    "inode_table");
>		} else {
>			if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
>				file->link_u.idev = pool_talloc(
>				    flist->hlink_pool, struct idev, 1,
>				    "inode_table");
>		}
>	}
>	if (file->link_u.idev) {
>		file->F_DEV = st.st_dev;
>		file->F_INODE = st.st_ino;
>	}
>#endif
>
>	if (dirname_len) {
>		file->dirname = lastdir = bp;
>		lastdir_len = dirname_len - 1;
>		memcpy(bp, dirname, dirname_len - 1);
>		bp += dirname_len;
>		bp[-1] = '\0';
>	} else if (dirname)
>		file->dirname = dirname;
>
>	file->basename = bp;
>	memcpy(bp, basename, basename_len);
>	bp += basename_len;
>
>#ifdef HAVE_STRUCT_STAT_ST_RDEV
>	if ((preserve_devices && IS_DEVICE(st.st_mode))
>	 || (preserve_specials && IS_SPECIAL(st.st_mode)))
>		file->u.rdev = st.st_rdev;
>#endif
>
>#ifdef SUPPORT_LINKS
>	if (linkname_len) {
>		file->u.link = bp;
>		memcpy(bp, linkname, linkname_len);
>		bp += linkname_len;
>	}
>#endif
>
>	if (sum_len) {
>		file->u.sum = bp;
>		file_checksum(thisname, bp, st.st_size);
>		/*bp += sum_len;*/
>	}
>
>	file->dir.root = flist_dir;
>
>	/* This code is only used by the receiver when it is building
>	 * a list of files for a delete pass. */
>	if (keep_dirlinks && linkname_len && flist) {
>		STRUCT_STAT st2;
>		int save_mode = file->mode;
>		file->mode = S_IFDIR; /* Find a directory with our name. */
>		if (flist_find(the_file_list, file) >= 0
>		    && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
>			file->modtime = st2.st_mtime;
>			file->length = st2.st_size;
>			file->mode = st2.st_mode;
>			file->uid = st2.st_uid;
>			file->gid = st2.st_gid;
>			file->u.link = NULL;
>		} else
>			file->mode = save_mode;
>	}
>
>	if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
>		stats.total_size += st.st_size;
>
>	return file;
>}
>
>static struct file_struct *send_file_name(int f, struct file_list *flist,
>					  char *fname, STRUCT_STAT *stp,
>					  unsigned short flags)
>{
>	struct file_struct *file;
>
>	file = make_file(fname, flist, stp, flags,
>			 f == -2 ? SERVER_FILTERS : ALL_FILTERS);
>	if (!file)
>		return NULL;
>
>	if (chmod_modes && !S_ISLNK(file->mode))
>		file->mode = tweak_mode(file->mode, chmod_modes);
>
>	maybe_emit_filelist_progress(flist->count + flist_count_offset);
>
>	flist_expand(flist);
>
>	if (file->basename[0]) {
>		flist->files[flist->count++] = file;
>		send_file_entry(file, f);
>	}
>	return file;
>}
>
>static void send_if_directory(int f, struct file_list *flist,
>			      struct file_struct *file,
>			      char *fbuf, unsigned int ol)
>{
>	char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
>
>	if (S_ISDIR(file->mode)
>	    && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
>		void *save_filters;
>		unsigned int len = strlen(fbuf);
>		if (len > 1 && fbuf[len-1] == '/')
>			fbuf[--len] = '\0';
>		if (len >= MAXPATHLEN - 1) {
>			io_error |= IOERR_GENERAL;
>			rprintf(FERROR, "skipping long-named directory: %s\n",
>				full_fname(fbuf));
>			return;
>		}
>		save_filters = push_local_filters(fbuf, len);
>		send_directory(f, flist, fbuf, len);
>		pop_local_filters(save_filters);
>		fbuf[ol] = '\0';
>		if (is_dot_dir)
>			fbuf[ol-1] = '.';
>	}
>}
>
>/* This function is normally called by the sender, but the receiving side also
> * calls it from get_dirlist() with f set to -1 so that we just construct the
> * file list in memory without sending it over the wire.  Also, get_dirlist()
> * might call this with f set to -2, which also indicates that local filter
> * rules should be ignored. */
>static void send_directory(int f, struct file_list *flist,
>			   char *fbuf, int len)
>{
>	struct dirent *di;
>	unsigned remainder;
>	char *p;
>	DIR *d;
>	int start = flist->count;
>
>	if (!(d = opendir(fbuf))) {
>		io_error |= IOERR_GENERAL;
>		rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
>		return;
>	}
>
>	p = fbuf + len;
>	if (len != 1 || *fbuf != '/')
>		*p++ = '/';
>	*p = '\0';
>	remainder = MAXPATHLEN - (p - fbuf);
>
>	for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
>		char *dname = d_name(di);
>		if (dname[0] == '.' && (dname[1] == '\0'
>		    || (dname[1] == '.' && dname[2] == '\0')))
>			continue;
>		if (strlcpy(p, dname, remainder) >= remainder) {
>			io_error |= IOERR_GENERAL;
>			rprintf(FINFO,
>				"cannot send long-named file %s\n",
>				full_fname(fbuf));
>			continue;
>		}
>
>		send_file_name(f, flist, fbuf, NULL, 0);
>	}
>
>	fbuf[len] = '\0';
>
>	if (errno) {
>		io_error |= IOERR_GENERAL;
>		rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
>	}
>
>	closedir(d);
>
>	if (recurse) {
>		int i, end = flist->count - 1;
>		for (i = start; i <= end; i++)
>			send_if_directory(f, flist, flist->files[i], fbuf, len);
>	}
>}
>
>struct file_list *send_file_list(int f, int argc, char *argv[])
>{
>	int len;
>	STRUCT_STAT st;
>	char *p, *dir, olddir[sizeof curr_dir];
>	char lastpath[MAXPATHLEN] = "";
>	struct file_list *flist;
>	struct timeval start_tv, end_tv;
>	int64 start_write;
>	int use_ff_fd = 0;
>
>	rprintf(FLOG, "building file list\n");
>	if (show_filelist_p())
>		start_filelist_progress("building file list");
>
>	start_write = stats.total_written;
>	gettimeofday(&start_tv, NULL);
>
>	flist = flist_new(WITH_HLINK, "send_file_list");
>
>	io_start_buffering_out();
>	if (filesfrom_fd >= 0) {
>		if (argv[0] && !push_dir(argv[0], 0)) {
>			rsyserr(FERROR, errno, "push_dir %s failed",
>				full_fname(argv[0]));
>			exit_cleanup(RERR_FILESELECT);
>		}
>		use_ff_fd = 1;
>	}
>
>	while (1) {
>		char fbuf[MAXPATHLEN];
>		char *fn;
>		int is_dot_dir;
>
>		if (use_ff_fd) {
>			if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
>				break;
>			sanitize_path(fbuf, fbuf, "", 0, NULL);
>		} else {
>			if (argc-- == 0)
>				break;
>			strlcpy(fbuf, *argv++, MAXPATHLEN);
>			if (sanitize_paths)
>				sanitize_path(fbuf, fbuf, "", 0, NULL);
>		}
>
>		len = strlen(fbuf);
>		if (relative_paths) {
>			/* We clean up fbuf below. */
>			is_dot_dir = 0;
>		} else if (!len || fbuf[len - 1] == '/') {
>			if (len == 2 && fbuf[0] == '.') {
>				/* Turn "./" into just "." rather than "./." */
>				fbuf[1] = '\0';
>			} else {
>				if (len + 1 >= MAXPATHLEN)
>					overflow_exit("send_file_list");
>				fbuf[len++] = '.';
>				fbuf[len] = '\0';
>			}
>			is_dot_dir = 1;
>		} else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
>		    && (len == 2 || fbuf[len-3] == '/')) {
>			if (len + 2 >= MAXPATHLEN)
>				overflow_exit("send_file_list");
>			fbuf[len++] = '/';
>			fbuf[len++] = '.';
>			fbuf[len] = '\0';
>			is_dot_dir = 1;
>		} else {
>			is_dot_dir = fbuf[len-1] == '.'
>				   && (len == 1 || fbuf[len-2] == '/');
>		}
>
>		if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
>			io_error |= IOERR_GENERAL;
>			rsyserr(FERROR, errno, "link_stat %s failed",
>				full_fname(fbuf));
>			continue;
>		}
>
>		if (S_ISDIR(st.st_mode) && !xfer_dirs) {
>			rprintf(FINFO, "skipping directory %s\n", fbuf);
>			continue;
>		}
>
>		dir = NULL;
>		olddir[0] = '\0';
>
>		if (!relative_paths) {
>			p = strrchr(fbuf, '/');
>			if (p) {
>				*p = '\0';
>				if (p == fbuf)
>					dir = "/";
>				else
>					dir = fbuf;
>				len -= p - fbuf + 1;
>				fn = p + 1;
>			} else
>				fn = fbuf;
>		} else {
>			if ((p = strstr(fbuf, "/./")) != NULL) {
>				*p = '\0';
>				if (p == fbuf)
>					dir = "/";
>				else
>					dir = fbuf;
>				len -= p - fbuf + 3;
>				fn = p + 3;
>			} else
>				fn = fbuf;
>			/* Get rid of trailing "/" and "/.". */
>			while (len) {
>				if (fn[len - 1] == '/') {
>					is_dot_dir = 1;
>					if (!--len && !dir) {
>						len++;
>						break;
>					}
>				}
>				else if (len >= 2 && fn[len - 1] == '.'
>						  && fn[len - 2] == '/') {
>					is_dot_dir = 1;
>					if (!(len -= 2) && !dir) {
>						len++;
>						break;
>					}
>				} else
>					break;
>			}
>			if (len == 1 && fn[0] == '/')
>				fn[len++] = '.';
>			fn[len] = '\0';
>			/* Reject a ".." dir in the active part of the path. */
>			for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
>				if ((p[2] == '/' || p[2] == '\0')
>				 && (p == fn || p[-1] == '/')) {
>					rprintf(FERROR,
>					    "found \"..\" dir in relative path: %s\n",
>					    fbuf);
>					exit_cleanup(RERR_SYNTAX);
>				}
>			}
>		}
>
>		if (!*fn) {
>			len = 1;
>			fn = ".";
>		}
>
>		if (dir && *dir) {
>			static char *lastdir;
>			static int lastdir_len;
>
>			strlcpy(olddir, curr_dir, sizeof olddir);
>
>			if (!push_dir(dir, 0)) {
>				io_error |= IOERR_GENERAL;
>				rsyserr(FERROR, errno, "push_dir %s failed",
>					full_fname(dir));
>				continue;
>			}
>
>			if (lastdir && strcmp(lastdir, dir) == 0) {
>				flist_dir = lastdir;
>				flist_dir_len = lastdir_len;
>			} else {
>				flist_dir = lastdir = strdup(dir);
>				flist_dir_len = lastdir_len = strlen(dir);
>			}
>		}
>
>		if (fn != fbuf)
>			memmove(fbuf, fn, len + 1);
>
>		if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
>			/* Send the implied directories at the start of the
>			 * source spec, so we get their permissions right. */
>			char *lp = lastpath, *slash = fbuf;
>			*p = '\0';
>			/* Skip any initial directories in our path that we
>			 * have in common with lastpath. */
>			for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
>				if (*fn == '/')
>					slash = fn;
>			}
>			*p = '/';
>			if (fn != p || (*lp && *lp != '/')) {
>				int save_copy_links = copy_links;
>				int save_xfer_dirs = xfer_dirs;
>				copy_links |= copy_unsafe_links;
>				xfer_dirs = 1;
>				while ((slash = strchr(slash+1, '/')) != 0) {
>					*slash = '\0';
>					send_file_name(f, flist, fbuf, NULL, 0);
>					*slash = '/';
>				}
>				copy_links = save_copy_links;
>				xfer_dirs = save_xfer_dirs;
>				*p = '\0';
>				strlcpy(lastpath, fbuf, sizeof lastpath);
>				*p = '/';
>			}
>		}
>
>		if (one_file_system)
>			filesystem_dev = st.st_dev;
>
>		if (recurse || (xfer_dirs && is_dot_dir)) {
>			struct file_struct *file;
>			file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
>			if (file)
>				send_if_directory(f, flist, file, fbuf, len);
>		} else
>			send_file_name(f, flist, fbuf, &st, 0);
>
>		if (olddir[0]) {
>			flist_dir = NULL;
>			flist_dir_len = 0;
>			if (!pop_dir(olddir)) {
>				rsyserr(FERROR, errno, "pop_dir %s failed",
>					full_fname(olddir));
>				exit_cleanup(RERR_FILESELECT);
>			}
>		}
>	}
>
>	gettimeofday(&end_tv, NULL);
>	stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
>			      + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
>	if (stats.flist_buildtime == 0)
>		stats.flist_buildtime = 1;
>	start_tv = end_tv;
>
>	send_file_entry(NULL, f);
>
>	if (show_filelist_p())
>		finish_filelist_progress(flist);
>
>	gettimeofday(&end_tv, NULL);
>	stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
>			     + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
>
>	if (flist->hlink_pool) {
>		pool_destroy(flist->hlink_pool);
>		flist->hlink_pool = NULL;
>	}
>
>	/* Sort the list without removing any duplicates.  This allows the
>	 * receiving side to ask for any name they like, which gives us the
>	 * flexibility to change the way we unduplicate names in the future
>	 * without causing a compatibility problem with older versions. */
>	clean_flist(flist, 0, 0);
>
>	send_uid_list(f);
>
>	/* send the io_error flag */
>	write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
>
>	io_end_buffering();
>	stats.flist_size = stats.total_written - start_write;
>	stats.num_files = flist->count;
>
>	if (verbose > 3)
>		output_flist(flist);
>
>	if (verbose > 2)
>		rprintf(FINFO, "send_file_list done\n");
>
>	return flist;
>}
>
>struct file_list *recv_file_list(int f)
>{
>	struct file_list *flist;
>	unsigned short flags;
>	int64 start_read;
>
>	rprintf(FLOG, "receiving file list\n");
>	if (show_filelist_p())
>		start_filelist_progress("receiving file list");
>
>	start_read = stats.total_read;
>
>	flist = flist_new(WITH_HLINK, "recv_file_list");
>
>	flist->count = 0;
>	flist->malloced = 1000;
>	flist->files = new_array(struct file_struct *, flist->malloced);
>	if (!flist->files)
>		goto oom;
>
>	while ((flags = read_byte(f)) != 0) {
>		struct file_struct *file;
>
>		flist_expand(flist);
>
>		if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
>			flags |= read_byte(f) << 8;
>		file = receive_file_entry(flist, flags, f);
>
>		if (S_ISREG(file->mode) || S_ISLNK(file->mode))
>			stats.total_size += file->length;
>
>		flist->files[flist->count++] = file;
>
>		maybe_emit_filelist_progress(flist->count);
>
>		if (verbose > 2) {
>			rprintf(FINFO, "recv_file_name(%s)\n",
>				f_name(file, NULL));
>		}
>	}
>	receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
>
>	if (verbose > 2)
>		rprintf(FINFO, "received %d names\n", flist->count);
>
>	if (show_filelist_p())
>		finish_filelist_progress(flist);
>
>	clean_flist(flist, relative_paths, 1);
>
>	if (f >= 0) {
>		recv_uid_list(f, flist);
>
>		/* Recv the io_error flag */
>		if (lp_ignore_errors(module_id) || ignore_errors)
>			read_int(f);
>		else
>			io_error |= read_int(f);
>	}
>
>	if (verbose > 3)
>		output_flist(flist);
>
>	if (list_only) {
>		int i;
>		for (i = 0; i < flist->count; i++)
>			list_file_entry(flist->files[i]);
>	}
>
>	if (verbose > 2)
>		rprintf(FINFO, "recv_file_list done\n");
>
>	stats.flist_size = stats.total_read - start_read;
>	stats.num_files = flist->count;
>
>	return flist;
>
>  oom:
>	out_of_memory("recv_file_list");
>	return NULL;		/* not reached */
>}
>
>static int file_compare(struct file_struct **file1, struct file_struct **file2)
>{
>	return f_name_cmp(*file1, *file2);
>}
>
>/* Search for an identically-named item in the file list.  Note that the
> * items must agree in their directory-ness, or no match is returned. */
>int flist_find(struct file_list *flist, struct file_struct *f)
>{
>	int low = flist->low, high = flist->high;
>	int diff, mid, mid_up;
>
>	while (low <= high) {
>		mid = (low + high) / 2;
>		if (flist->files[mid]->basename)
>			mid_up = mid;
>		else {
>			/* Scan for the next non-empty entry using the cached
>			 * distance values.  If the value isn't fully up-to-
>			 * date, update it. */
>			mid_up = mid + flist->files[mid]->dir.depth;
>			if (!flist->files[mid_up]->basename) {
>				do {
>				    mid_up += flist->files[mid_up]->dir.depth;
>				} while (!flist->files[mid_up]->basename);
>				flist->files[mid]->dir.depth = mid_up - mid;
>			}
>			if (mid_up > high) {
>				/* If there's nothing left above us, set high to
>				 * a non-empty entry below us and continue. */
>				high = mid - flist->files[mid]->length;
>				if (!flist->files[high]->basename) {
>					do {
>					    high -= flist->files[high]->length;
>					} while (!flist->files[high]->basename);
>					flist->files[mid]->length = mid - high;
>				}
>				continue;
>			}
>		}
>		diff = f_name_cmp(flist->files[mid_up], f);
>		if (diff == 0) {
>			if (protocol_version < 29
>			    && S_ISDIR(flist->files[mid_up]->mode)
>			    != S_ISDIR(f->mode))
>				return -1;
>			return mid_up;
>		}
>		if (diff < 0)
>			low = mid_up + 1;
>		else
>			high = mid - 1;
>	}
>	return -1;
>}
>
>/*
> * Free up any resources a file_struct has allocated
> * and clear the file.
> */
>void clear_file(struct file_struct *file, struct file_list *flist)
>{
>	if (flist->hlink_pool && file->link_u.idev)
>		pool_free(flist->hlink_pool, 0, file->link_u.idev);
>	memset(file, 0, file_struct_len);
>	/* In an empty entry, dir.depth is an offset to the next non-empty
>	 * entry.  Likewise for length in the opposite direction.  We assume
>	 * that we're alone for now since flist_find() will adjust the counts
>	 * it runs into that aren't up-to-date. */
>	file->length = file->dir.depth = 1;
>}
>
>/*
> * allocate a new file list
> */
>struct file_list *flist_new(int with_hlink, char *msg)
>{
>	struct file_list *flist;
>
>	flist = new(struct file_list);
>	if (!flist)
>		out_of_memory(msg);
>
>	memset(flist, 0, sizeof (struct file_list));
>
>	if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
>	    out_of_memory, POOL_INTERN)))
>		out_of_memory(msg);
>
>#ifdef SUPPORT_HARD_LINKS
>	if (with_hlink && preserve_hard_links) {
>		if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
>		    sizeof (struct idev), out_of_memory, POOL_INTERN)))
>			out_of_memory(msg);
>	}
>#endif
>
>	return flist;
>}
>
>/*
> * free up all elements in a flist
> */
>void flist_free(struct file_list *flist)
>{
>	pool_destroy(flist->file_pool);
>	pool_destroy(flist->hlink_pool);
>	free(flist->files);
>	free(flist);
>}
>
>/*
> * This routine ensures we don't have any duplicate names in our file list.
> * duplicate names can cause corruption because of the pipelining
> */
>static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
>{
>	char fbuf[MAXPATHLEN];
>	int i, prev_i = 0;
>
>	if (!flist)
>		return;
>	if (flist->count == 0) {
>		flist->high = -1;
>		return;
>	}
>
>	qsort(flist->files, flist->count,
>	    sizeof flist->files[0], (int (*)())file_compare);
>
>	for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
>		if (flist->files[i]->basename) {
>			prev_i = i;
>			break;
>		}
>	}
>	flist->low = prev_i;
>	while (++i < flist->count) {
>		int j;
>		struct file_struct *file = flist->files[i];
>
>		if (!file->basename)
>			continue;
>		if (f_name_cmp(file, flist->files[prev_i]) == 0)
>			j = prev_i;
>		else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
>			int save_mode = file->mode;
>			/* Make sure that this directory doesn't duplicate a
>			 * non-directory earlier in the list. */
>			flist->high = prev_i;
>			file->mode = S_IFREG;
>			j = flist_find(flist, file);
>			file->mode = save_mode;
>		} else
>			j = -1;
>		if (j >= 0) {
>			struct file_struct *fp = flist->files[j];
>			int keep, drop;
>			/* If one is a dir and the other is not, we want to
>			 * keep the dir because it might have contents in the
>			 * list. */
>			if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
>				if (S_ISDIR(file->mode))
>					keep = i, drop = j;
>				else
>					keep = j, drop = i;
>			} else
>				keep = j, drop = i;
>			if (verbose > 1 && !am_server) {
>				rprintf(FINFO,
>					"removing duplicate name %s from file list (%d)\n",
>					f_name(file, fbuf), drop);
>			}
>			/* Make sure we don't lose track of a user-specified
>			 * top directory. */
>			flist->files[keep]->flags |= flist->files[drop]->flags
>						   & (FLAG_TOP_DIR|FLAG_DEL_HERE);
>
>			clear_file(flist->files[drop], flist);
>
>			if (keep == i) {
>				if (flist->low == drop) {
>					for (j = drop + 1;
>					     j < i && !flist->files[j]->basename;
>					     j++) {}
>					flist->low = j;
>				}
>				prev_i = i;
>			}
>		} else
>			prev_i = i;
>	}
>	flist->high = no_dups ? prev_i : flist->count - 1;
>
>	if (strip_root) {
>		/* We need to strip off the leading slashes for relative
>		 * paths, but this must be done _after_ the sorting phase. */
>		for (i = flist->low; i <= flist->high; i++) {
>			struct file_struct *file = flist->files[i];
>
>			if (!file->dirname)
>				continue;
>			while (*file->dirname == '/')
>				file->dirname++;
>			if (!*file->dirname)
>				file->dirname = NULL;
>		}
>	}
>
>	if (prune_empty_dirs && no_dups) {
>		int j, prev_depth = 0;
>
>		prev_i = 0; /* It's OK that this isn't really true. */
>
>		for (i = flist->low; i <= flist->high; i++) {
>			struct file_struct *fp, *file = flist->files[i];
>
>			/* This temporarily abuses the dir.depth value for a
>			 * directory that is in a chain that might get pruned.
>			 * We restore the old value if it gets a reprieve. */
>			if (S_ISDIR(file->mode) && file->dir.depth) {
>				/* Dump empty dirs when coming back down. */
>				for (j = prev_depth; j >= file->dir.depth; j--) {
>					fp = flist->files[prev_i];
>					if (fp->dir.depth >= 0)
>						break;
>					prev_i = -fp->dir.depth-1;
>					clear_file(fp, flist);
>				}
>				prev_depth = file->dir.depth;
>				if (is_excluded(f_name(file, fbuf), 1,
>						       ALL_FILTERS)) {
>					/* Keep dirs through this dir. */
>					for (j = prev_depth-1; ; j--) {
>						fp = flist->files[prev_i];
>						if (fp->dir.depth >= 0)
>							break;
>						prev_i = -fp->dir.depth-1;
>						fp->dir.depth = j;
>					}
>				} else
>					file->dir.depth = -prev_i-1;
>				prev_i = i;
>			} else {
>				/* Keep dirs through this non-dir. */
>				for (j = prev_depth; ; j--) {
>					fp = flist->files[prev_i];
>					if (fp->dir.depth >= 0)
>						break;
>					prev_i = -fp->dir.depth-1;
>					fp->dir.depth = j;
>				}
>			}
>		}
>		/* Dump empty all remaining empty dirs. */
>		while (1) {
>			struct file_struct *fp = flist->files[prev_i];
>			if (fp->dir.depth >= 0)
>				break;
>			prev_i = -fp->dir.depth-1;
>			clear_file(fp, flist);
>		}
>
>		for (i = flist->low; i <= flist->high; i++) {
>			if (flist->files[i]->basename)
>				break;
>		}
>		flist->low = i;
>		for (i = flist->high; i >= flist->low; i--) {
>			if (flist->files[i]->basename)
>				break;
>		}
>		flist->high = i;
>	}
>}
>
>static void output_flist(struct file_list *flist)
>{
>	char uidbuf[16], gidbuf[16], depthbuf[16];
>	struct file_struct *file;
>	const char *who = who_am_i();
>	int i;
>
>	for (i = 0; i < flist->count; i++) {
>		file = flist->files[i];
>		if ((am_root || am_sender) && preserve_uid)
>			snprintf(uidbuf, sizeof uidbuf, " uid=%ld", (long)file->uid);
>		else
>			*uidbuf = '\0';
>		if (preserve_gid && file->gid != GID_NONE)
>			snprintf(gidbuf, sizeof gidbuf, " gid=%ld", (long)file->gid);
>		else
>			*gidbuf = '\0';
>		if (!am_sender)
>			snprintf(depthbuf, sizeof depthbuf, "%d", file->dir.depth);
>		rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
>			who, i, am_sender ? NS(file->dir.root) : depthbuf,
>			file->dirname ? file->dirname : "",
>			file->dirname ? "/" : "", NS(file->basename),
>			S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
>			(double)file->length, uidbuf, gidbuf, file->flags);
>	}
>}
>
>enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
>enum fnc_type { t_PATH, t_ITEM };
>
>/* Compare the names of two file_struct entities, similar to how strcmp()
> * would do if it were operating on the joined strings.
> *
> * Some differences beginning with protocol_version 29: (1) directory names
> * are compared with an assumed trailing slash so that they compare in a
> * way that would cause them to sort immediately prior to any content they
> * may have; (2) a directory of any name compares after a non-directory of
> * any name at the same depth; (3) a directory with name "." compares prior
> * to anything else.  These changes mean that a directory and a non-dir
> * with the same name will not compare as equal (protocol_version >= 29).
> *
> * The dirname component can be an empty string, but the basename component
> * cannot (and never is in the current codebase).  The basename component
> * may be NULL (for a removed item), in which case it is considered to be
> * after any existing item. */
>int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
>{
>	int dif;
>	const uchar *c1, *c2;
>	enum fnc_state state1, state2;
>	enum fnc_type type1, type2;
>	enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
>
>	if (!f1 || !f1->basename) {
>		if (!f2 || !f2->basename)
>			return 0;
>		return -1;
>	}
>	if (!f2 || !f2->basename)
>		return 1;
>
>	c1 = (uchar*)f1->dirname;
>	c2 = (uchar*)f2->dirname;
>	if (c1 == c2)
>		c1 = c2 = NULL;
>	if (!c1) {
>		type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
>		c1 = (uchar*)f1->basename;
>		if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
>			type1 = t_ITEM;
>			state1 = s_TRAILING;
>			c1 = (uchar*)"";
>		} else
>			state1 = s_BASE;
>	} else {
>		type1 = t_path;
>		state1 = s_DIR;
>	}
>	if (!c2) {
>		type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
>		c2 = (uchar*)f2->basename;
>		if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
>			type2 = t_ITEM;
>			state2 = s_TRAILING;
>			c2 = (uchar*)"";
>		} else
>			state2 = s_BASE;
>	} else {
>		type2 = t_path;
>		state2 = s_DIR;
>	}
>
>	if (type1 != type2)
>		return type1 == t_PATH ? 1 : -1;
>
>	do {
>		if (!*c1) {
>			switch (state1) {
>			case s_DIR:
>				state1 = s_SLASH;
>				c1 = (uchar*)"/";
>				break;
>			case s_SLASH:
>				type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
>				c1 = (uchar*)f1->basename;
>				if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
>					type1 = t_ITEM;
>					state1 = s_TRAILING;
>					c1 = (uchar*)"";
>				} else
>					state1 = s_BASE;
>				break;
>			case s_BASE:
>				state1 = s_TRAILING;
>				if (type1 == t_PATH) {
>					c1 = (uchar*)"/";
>					break;
>				}
>				/* FALL THROUGH */
>			case s_TRAILING:
>				type1 = t_ITEM;
>				break;
>			}
>			if (*c2 && type1 != type2)
>				return type1 == t_PATH ? 1 : -1;
>		}
>		if (!*c2) {
>			switch (state2) {
>			case s_DIR:
>				state2 = s_SLASH;
>				c2 = (uchar*)"/";
>				break;
>			case s_SLASH:
>				type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
>				c2 = (uchar*)f2->basename;
>				if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
>					type2 = t_ITEM;
>					state2 = s_TRAILING;
>					c2 = (uchar*)"";
>				} else
>					state2 = s_BASE;
>				break;
>			case s_BASE:
>				state2 = s_TRAILING;
>				if (type2 == t_PATH) {
>					c2 = (uchar*)"/";
>					break;
>				}
>				/* FALL THROUGH */
>			case s_TRAILING:
>				if (!*c1)
>					return 0;
>				type2 = t_ITEM;
>				break;
>			}
>			if (type1 != type2)
>				return type1 == t_PATH ? 1 : -1;
>		}
>	} while ((dif = (int)*c1++ - (int)*c2++) == 0);
>
>	return dif;
>}
>
>/* Return a copy of the full filename of a flist entry, using the indicated
> * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
> * done because we checked the size when creating the file_struct entry.
> */
>char *f_name(struct file_struct *f, char *fbuf)
>{
>	if (!f || !f->basename)
>		return NULL;
>
>	if (!fbuf) {
>		static char names[5][MAXPATHLEN];
>		static unsigned int n;
>
>		n = (n + 1) % (sizeof names / sizeof names[0]);
>
>		fbuf = names[n];
>	}
>
>	if (f->dirname) {
>		int len = strlen(f->dirname);
>		memcpy(fbuf, f->dirname, len);
>		fbuf[len] = '/';
>		strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
>	} else
>		strlcpy(fbuf, f->basename, MAXPATHLEN);
>
>	return fbuf;
>}
>
>/* Do a non-recursive scan of the named directory, possibly ignoring all
> * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
> * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
> * buffer (the functions we call will append names onto the end, but the old
> * dir value will be restored on exit). */
>struct file_list *get_dirlist(char *dirname, int dlen,
>			      int ignore_filter_rules)
>{
>	struct file_list *dirlist;
>	char dirbuf[MAXPATHLEN];
>	int save_recurse = recurse;
>	int save_xfer_dirs = xfer_dirs;
>
>	if (dlen < 0) {
>		dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
>		if (dlen >= MAXPATHLEN)
>			return NULL;
>		dirname = dirbuf;
>	}
>
>	dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
>
>	recurse = 0;
>	xfer_dirs = 1;
>	send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
>	xfer_dirs = save_xfer_dirs;
>	recurse = save_recurse;
>	if (do_progress)
>		flist_count_offset += dirlist->count;
>
>	clean_flist(dirlist, 0, 0);
>
>	if (verbose > 3)
>		output_flist(dirlist);
>
>	return dirlist;
>}

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Attachments on bug 4899: 2873 | 2876