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generator.c
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generator.c
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/*
* Routines that are exclusive to the generator process.
*
* Copyright (C) 1996-2000 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2009 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 3 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, visit the http://fsf.org website.
*/
#include "rsync.h"
extern int verbose;
extern int dry_run;
extern int do_xfers;
extern int stdout_format_has_i;
extern int logfile_format_has_i;
extern int am_root;
extern int am_server;
extern int am_daemon;
extern int inc_recurse;
extern int do_progress;
extern int relative_paths;
extern int implied_dirs;
extern int keep_dirlinks;
extern int preserve_acls;
extern int preserve_xattrs;
extern int preserve_links;
extern int preserve_devices;
extern int preserve_specials;
extern int preserve_hard_links;
extern int preserve_executability;
extern int preserve_perms;
extern int preserve_times;
extern int delete_mode;
extern int delete_before;
extern int delete_during;
extern int delete_after;
extern int msgdone_cnt;
extern int ignore_errors;
extern int remove_source_files;
extern int delay_updates;
extern int update_only;
extern int ignore_existing;
extern int ignore_non_existing;
extern int inplace;
extern int append_mode;
extern int make_backups;
extern int csum_length;
extern int ignore_times;
extern int size_only;
extern OFF_T max_size;
extern OFF_T min_size;
extern int io_error;
extern int flist_eof;
extern int allowed_lull;
extern int sock_f_out;
extern int ignore_timeout;
extern int protocol_version;
extern int file_total;
extern int fuzzy_basis;
extern int always_checksum;
extern int checksum_len;
extern char *partial_dir;
extern char *basis_dir[MAX_BASIS_DIRS+1];
extern int compare_dest;
extern int copy_dest;
extern int link_dest;
extern int whole_file;
extern int list_only;
extern int read_batch;
extern int safe_symlinks;
extern long block_size; /* "long" because popt can't set an int32. */
extern int unsort_ndx;
extern int max_delete;
extern int force_delete;
extern int one_file_system;
extern struct stats stats;
extern dev_t filesystem_dev;
extern mode_t orig_umask;
extern uid_t our_uid;
extern char *backup_dir;
extern char *backup_suffix;
extern int backup_suffix_len;
extern struct file_list *cur_flist, *first_flist, *dir_flist;
extern struct filter_list_struct daemon_filter_list;
int ignore_perishable = 0;
int non_perishable_cnt = 0;
int maybe_ATTRS_REPORT = 0;
static dev_t dev_zero;
static int deletion_count = 0; /* used to implement --max-delete */
static int deldelay_size = 0, deldelay_cnt = 0;
static char *deldelay_buf = NULL;
static int deldelay_fd = -1;
static int loopchk_limit;
static int dir_tweaking;
static int symlink_timeset_failed_flags;
static int need_retouch_dir_times;
static int need_retouch_dir_perms;
static const char *solo_file = NULL;
/* For calling delete_item() and delete_dir_contents(). */
#define DEL_NO_UID_WRITE (1<<0) /* file/dir has our uid w/o write perm */
#define DEL_RECURSE (1<<1) /* if dir, delete all contents */
#define DEL_DIR_IS_EMPTY (1<<2) /* internal delete_FUNCTIONS use only */
#define DEL_FOR_FILE (1<<3) /* making room for a replacement file */
#define DEL_FOR_DIR (1<<4) /* making room for a replacement dir */
#define DEL_FOR_SYMLINK (1<<5) /* making room for a replacement symlink */
#define DEL_FOR_DEVICE (1<<6) /* making room for a replacement device */
#define DEL_FOR_SPECIAL (1<<7) /* making room for a replacement special */
#define DEL_MAKE_ROOM (DEL_FOR_FILE|DEL_FOR_DIR|DEL_FOR_SYMLINK|DEL_FOR_DEVICE|DEL_FOR_SPECIAL)
enum nonregtype {
TYPE_DIR, TYPE_SPECIAL, TYPE_DEVICE, TYPE_SYMLINK
};
enum delret {
DR_SUCCESS = 0, DR_FAILURE, DR_AT_LIMIT, DR_NOT_EMPTY
};
/* Forward declarations. */
static enum delret delete_dir_contents(char *fname, uint16 flags);
#ifdef SUPPORT_HARD_LINKS
static void handle_skipped_hlink(struct file_struct *file, int itemizing,
enum logcode code, int f_out);
#endif
static int is_backup_file(char *fn)
{
int k = strlen(fn) - backup_suffix_len;
return k > 0 && strcmp(fn+k, backup_suffix) == 0;
}
/* Delete a file or directory. If DEL_RECURSE is set in the flags, this will
* delete recursively.
*
* Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
* a directory! (The buffer is used for recursion, but returned unchanged.)
*/
static enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
{
enum delret ret;
char *what;
int ok;
if (verbose > 2) {
rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
fbuf, (int)mode, (int)flags);
}
if (flags & DEL_NO_UID_WRITE)
do_chmod(fbuf, mode | S_IWUSR);
if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
/* This only happens on the first call to delete_item() since
* delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
ignore_perishable = 1;
/* If DEL_RECURSE is not set, this just reports emptiness. */
ret = delete_dir_contents(fbuf, flags);
ignore_perishable = 0;
if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
goto check_ret;
/* OK: try to delete the directory. */
}
if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && ++deletion_count > max_delete)
return DR_AT_LIMIT;
if (S_ISDIR(mode)) {
what = "rmdir";
ok = do_rmdir(fbuf) == 0;
} else if (make_backups > 0 && (backup_dir || !is_backup_file(fbuf))) {
what = "make_backup";
ok = make_backup(fbuf);
} else {
what = "unlink";
ok = robust_unlink(fbuf) == 0;
}
if (ok) {
if (!(flags & DEL_MAKE_ROOM))
log_delete(fbuf, mode);
ret = DR_SUCCESS;
} else {
if (S_ISDIR(mode) && errno == ENOTEMPTY) {
rprintf(FINFO, "cannot delete non-empty directory: %s\n",
fbuf);
ret = DR_NOT_EMPTY;
} else if (errno != ENOENT) {
rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
what, fbuf);
ret = DR_FAILURE;
} else {
deletion_count--;
ret = DR_SUCCESS;
}
}
check_ret:
if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
const char *desc;
switch (flags & DEL_MAKE_ROOM) {
case DEL_FOR_FILE: desc = "regular file"; break;
case DEL_FOR_DIR: desc = "directory"; break;
case DEL_FOR_SYMLINK: desc = "symlink"; break;
case DEL_FOR_DEVICE: desc = "device file"; break;
case DEL_FOR_SPECIAL: desc = "special file"; break;
default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
}
rprintf(FERROR_XFER, "could not make way for new %s: %s\n",
desc, fbuf);
}
return ret;
}
/* The directory is about to be deleted: if DEL_RECURSE is given, delete all
* its contents, otherwise just checks for content. Returns DR_SUCCESS or
* DR_NOT_EMPTY. Note that fname must point to a MAXPATHLEN buffer! (The
* buffer is used for recursion, but returned unchanged.)
*/
static enum delret delete_dir_contents(char *fname, uint16 flags)
{
struct file_list *dirlist;
enum delret ret;
unsigned remainder;
void *save_filters;
int j, dlen;
char *p;
if (verbose > 3) {
rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
fname, flags);
}
dlen = strlen(fname);
save_filters = push_local_filters(fname, dlen);
non_perishable_cnt = 0;
dirlist = get_dirlist(fname, dlen, 0);
ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
if (!dirlist->used)
goto done;
if (!(flags & DEL_RECURSE)) {
ret = DR_NOT_EMPTY;
goto done;
}
p = fname + dlen;
if (dlen != 1 || *fname != '/')
*p++ = '/';
remainder = MAXPATHLEN - (p - fname);
/* We do our own recursion, so make delete_item() non-recursive. */
flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
| DEL_DIR_IS_EMPTY;
for (j = dirlist->used; j--; ) {
struct file_struct *fp = dirlist->files[j];
if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
if (verbose > 1) {
rprintf(FINFO,
"mount point, %s, pins parent directory\n",
f_name(fp, NULL));
}
ret = DR_NOT_EMPTY;
continue;
}
strlcpy(p, fp->basename, remainder);
if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
do_chmod(fname, fp->mode | S_IWUSR);
/* Save stack by recursing to ourself directly. */
if (S_ISDIR(fp->mode)) {
if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
ret = DR_NOT_EMPTY;
}
if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
ret = DR_NOT_EMPTY;
}
fname[dlen] = '\0';
done:
flist_free(dirlist);
pop_local_filters(save_filters);
if (ret == DR_NOT_EMPTY) {
rprintf(FINFO, "cannot delete non-empty directory: %s\n",
fname);
}
return ret;
}
static int start_delete_delay_temp(void)
{
char fnametmp[MAXPATHLEN];
int save_dry_run = dry_run;
dry_run = 0;
if (!get_tmpname(fnametmp, "deldelay")
|| (deldelay_fd = do_mkstemp(fnametmp, 0600)) < 0) {
rprintf(FINFO, "NOTE: Unable to create delete-delay temp file%s.\n",
inc_recurse ? "" : " -- switching to --delete-after");
delete_during = 0;
delete_after = !inc_recurse;
dry_run = save_dry_run;
return 0;
}
unlink(fnametmp);
dry_run = save_dry_run;
return 1;
}
static int flush_delete_delay(void)
{
if (deldelay_fd < 0 && !start_delete_delay_temp())
return 0;
if (write(deldelay_fd, deldelay_buf, deldelay_cnt) != deldelay_cnt) {
rsyserr(FERROR, errno, "flush of delete-delay buffer");
delete_during = 0;
delete_after = !inc_recurse;
close(deldelay_fd);
return 0;
}
deldelay_cnt = 0;
return 1;
}
static int remember_delete(struct file_struct *file, const char *fname, int flags)
{
int len;
if (deldelay_cnt == deldelay_size && !flush_delete_delay())
return 0;
if (flags & DEL_NO_UID_WRITE)
deldelay_buf[deldelay_cnt++] = '!';
while (1) {
len = snprintf(deldelay_buf + deldelay_cnt,
deldelay_size - deldelay_cnt,
"%x %s%c",
(int)file->mode, fname, '\0');
if ((deldelay_cnt += len) <= deldelay_size)
break;
deldelay_cnt -= len;
if (!flush_delete_delay())
return 0;
}
return 1;
}
static int read_delay_line(char *buf, int *flags_p)
{
static int read_pos = 0;
int j, len, mode;
char *bp, *past_space;
while (1) {
for (j = read_pos; j < deldelay_cnt && deldelay_buf[j]; j++) {}
if (j < deldelay_cnt)
break;
if (deldelay_fd < 0) {
if (j > read_pos)
goto invalid_data;
return -1;
}
deldelay_cnt -= read_pos;
if (deldelay_cnt == deldelay_size)
goto invalid_data;
if (deldelay_cnt && read_pos) {
memmove(deldelay_buf, deldelay_buf + read_pos,
deldelay_cnt);
}
len = read(deldelay_fd, deldelay_buf + deldelay_cnt,
deldelay_size - deldelay_cnt);
if (len == 0) {
if (deldelay_cnt) {
rprintf(FERROR,
"ERROR: unexpected EOF in delete-delay file.\n");
}
return -1;
}
if (len < 0) {
rsyserr(FERROR, errno,
"reading delete-delay file");
return -1;
}
deldelay_cnt += len;
read_pos = 0;
}
bp = deldelay_buf + read_pos;
if (*bp == '!') {
bp++;
*flags_p = DEL_NO_UID_WRITE;
} else
*flags_p = 0;
if (sscanf(bp, "%x ", &mode) != 1) {
invalid_data:
rprintf(FERROR, "ERROR: invalid data in delete-delay file.\n");
return -1;
}
past_space = strchr(bp, ' ') + 1;
len = j - read_pos - (past_space - bp) + 1; /* count the '\0' */
read_pos = j + 1;
if (len > MAXPATHLEN) {
rprintf(FERROR, "ERROR: filename too long in delete-delay file.\n");
return -1;
}
/* The caller needs the name in a MAXPATHLEN buffer, so we copy it
* instead of returning a pointer to our buffer. */
memcpy(buf, past_space, len);
return mode;
}
static void do_delayed_deletions(char *delbuf)
{
int mode, flags;
if (deldelay_fd >= 0) {
if (deldelay_cnt && !flush_delete_delay())
return;
lseek(deldelay_fd, 0, 0);
}
while ((mode = read_delay_line(delbuf, &flags)) >= 0)
delete_item(delbuf, mode, flags | DEL_RECURSE);
if (deldelay_fd >= 0)
close(deldelay_fd);
}
/* This function is used to implement per-directory deletion, and is used by
* all the --delete-WHEN options. Note that the fbuf pointer must point to a
* MAXPATHLEN buffer with the name of the directory in it (the functions we
* call will append names onto the end, but the old dir value will be restored
* on exit). */
static void delete_in_dir(char *fbuf, struct file_struct *file, dev_t *fs_dev)
{
static int already_warned = 0;
struct file_list *dirlist;
char delbuf[MAXPATHLEN];
int dlen, i;
if (!fbuf) {
change_local_filter_dir(NULL, 0, 0);
return;
}
if (verbose > 2)
rprintf(FINFO, "delete_in_dir(%s)\n", fbuf);
if (allowed_lull)
maybe_send_keepalive();
if (io_error && !ignore_errors) {
if (already_warned)
return;
rprintf(FINFO,
"IO error encountered -- skipping file deletion\n");
already_warned = 1;
return;
}
dlen = strlen(fbuf);
change_local_filter_dir(fbuf, dlen, F_DEPTH(file));
if (one_file_system) {
if (file->flags & FLAG_TOP_DIR)
filesystem_dev = *fs_dev;
else if (filesystem_dev != *fs_dev)
return;
}
dirlist = get_dirlist(fbuf, dlen, 0);
/* If an item in dirlist is not found in flist, delete it
* from the filesystem. */
for (i = dirlist->used; i--; ) {
struct file_struct *fp = dirlist->files[i];
if (!F_IS_ACTIVE(fp))
continue;
if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
if (verbose > 1)
rprintf(FINFO, "cannot delete mount point: %s\n",
f_name(fp, NULL));
continue;
}
/* Here we want to match regardless of file type. Replacement
* of a file with one of another type is handled separately by
* a delete_item call with a DEL_MAKE_ROOM flag. */
if (flist_find_ignore_dirness(cur_flist, fp) < 0) {
int flags = DEL_RECURSE;
if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
flags |= DEL_NO_UID_WRITE;
f_name(fp, delbuf);
if (delete_during == 2) {
if (!remember_delete(fp, delbuf, flags))
break;
} else
delete_item(delbuf, fp->mode, flags);
}
}
flist_free(dirlist);
}
/* This deletes any files on the receiving side that are not present on the
* sending side. This is used by --delete-before and --delete-after. */
static void do_delete_pass(void)
{
char fbuf[MAXPATHLEN];
STRUCT_STAT st;
int j;
/* dry_run is incremented when the destination doesn't exist yet. */
if (dry_run > 1 || list_only)
return;
for (j = 0; j < cur_flist->used; j++) {
struct file_struct *file = cur_flist->sorted[j];
f_name(file, fbuf);
if (!(file->flags & FLAG_CONTENT_DIR)) {
change_local_filter_dir(fbuf, strlen(fbuf), F_DEPTH(file));
continue;
}
if (verbose > 1 && file->flags & FLAG_TOP_DIR)
rprintf(FINFO, "deleting in %s\n", fbuf);
if (link_stat(fbuf, &st, keep_dirlinks) < 0
|| !S_ISDIR(st.st_mode))
continue;
delete_in_dir(fbuf, file, &st.st_dev);
}
delete_in_dir(NULL, NULL, &dev_zero);
if (do_progress && !am_server)
rprintf(FINFO, " \r");
}
static inline int time_differs(struct file_struct *file, stat_x *sxp)
{
return cmp_time(sxp->st.st_mtime, file->modtime);
}
static inline int perms_differ(struct file_struct *file, stat_x *sxp)
{
if (preserve_perms)
return !BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS);
if (preserve_executability)
return (sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0);
return 0;
}
static inline int ownership_differs(struct file_struct *file, stat_x *sxp)
{
if (am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file))
return 1;
if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP) && sxp->st.st_gid != (gid_t)F_GROUP(file))
return 1;
return 0;
}
#ifdef SUPPORT_ACLS
static inline int acls_differ(const char *fname, struct file_struct *file, stat_x *sxp)
{
if (preserve_acls) {
if (!ACL_READY(*sxp))
get_acl(fname, sxp);
if (set_acl(NULL, file, sxp, file->mode))
return 1;
}
return 0;
}
#endif
#ifdef SUPPORT_XATTRS
static inline int xattrs_differ(const char *fname, struct file_struct *file, stat_x *sxp)
{
if (preserve_xattrs) {
if (!XATTR_READY(*sxp))
get_xattr(fname, sxp);
if (xattr_diff(file, sxp, 0))
return 1;
}
return 0;
}
#endif
int unchanged_attrs(const char *fname, struct file_struct *file, stat_x *sxp)
{
if (S_ISLNK(file->mode)) {
#ifdef CAN_SET_SYMLINK_TIMES
if (preserve_times & PRESERVE_LINK_TIMES && time_differs(file, sxp))
return 0;
#endif
#ifdef CAN_CHMOD_SYMLINK
if (perms_differ(file, sxp))
return 0;
#endif
#ifdef CAN_CHOWN_SYMLINK
if (ownership_differs(file, sxp))
return 0;
#endif
#if defined SUPPORT_ACLS && 0 /* no current symlink-ACL support */
if (acls_differ(fname, file, sxp))
return 0;
#endif
#if defined SUPPORT_XATTRS && !defined NO_SYMLINK_XATTRS
if (xattrs_differ(fname, file, sxp))
return 0;
#endif
} else {
if (preserve_times && time_differs(file, sxp))
return 0;
if (perms_differ(file, sxp))
return 0;
if (ownership_differs(file, sxp))
return 0;
#ifdef SUPPORT_ACLS
if (acls_differ(fname, file, sxp))
return 0;
#endif
#ifdef SUPPORT_XATTRS
if (xattrs_differ(fname, file, sxp))
return 0;
#endif
}
return 1;
}
void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statret,
stat_x *sxp, int32 iflags, uchar fnamecmp_type,
const char *xname)
{
if (statret >= 0) { /* A from-dest-dir statret can == 1! */
int keep_time = !preserve_times ? 0
: S_ISDIR(file->mode) ? preserve_times & PRESERVE_DIR_TIMES
: S_ISLNK(file->mode) ? preserve_times & PRESERVE_LINK_TIMES
: 1;
if (S_ISREG(file->mode) && F_LENGTH(file) != sxp->st.st_size)
iflags |= ITEM_REPORT_SIZE;
if (file->flags & FLAG_TIME_FAILED) { /* symlinks only */
if (iflags & ITEM_LOCAL_CHANGE)
iflags |= symlink_timeset_failed_flags;
} else if (keep_time
? cmp_time(file->modtime, sxp->st.st_mtime) != 0
: iflags & (ITEM_TRANSFER|ITEM_LOCAL_CHANGE) && !(iflags & ITEM_MATCHED)
&& (!(iflags & ITEM_XNAME_FOLLOWS) || *xname))
iflags |= ITEM_REPORT_TIME;
#if !defined HAVE_LCHMOD && !defined HAVE_SETATTRLIST
if (S_ISLNK(file->mode)) {
;
} else
#endif
if (preserve_perms) {
if (!BITS_EQUAL(sxp->st.st_mode, file->mode, CHMOD_BITS))
iflags |= ITEM_REPORT_PERMS;
} else if (preserve_executability
&& ((sxp->st.st_mode & 0111 ? 1 : 0) ^ (file->mode & 0111 ? 1 : 0)))
iflags |= ITEM_REPORT_PERMS;
if (uid_ndx && am_root && (uid_t)F_OWNER(file) != sxp->st.st_uid)
iflags |= ITEM_REPORT_OWNER;
if (gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
&& sxp->st.st_gid != (gid_t)F_GROUP(file))
iflags |= ITEM_REPORT_GROUP;
#ifdef SUPPORT_ACLS
if (preserve_acls && !S_ISLNK(file->mode)) {
if (!ACL_READY(*sxp))
get_acl(fnamecmp, sxp);
if (set_acl(NULL, file, sxp, file->mode))
iflags |= ITEM_REPORT_ACL;
}
#endif
#ifdef SUPPORT_XATTRS
if (preserve_xattrs) {
if (!XATTR_READY(*sxp))
get_xattr(fnamecmp, sxp);
if (xattr_diff(file, sxp, 1))
iflags |= ITEM_REPORT_XATTR;
}
#endif
} else {
#ifdef SUPPORT_XATTRS
if (preserve_xattrs && xattr_diff(file, NULL, 1))
iflags |= ITEM_REPORT_XATTR;
#endif
iflags |= ITEM_IS_NEW;
}
iflags &= 0xffff;
if ((iflags & (SIGNIFICANT_ITEM_FLAGS|ITEM_REPORT_XATTR) || verbose > 1
|| stdout_format_has_i > 1 || (xname && *xname)) && !read_batch) {
if (protocol_version >= 29) {
if (ndx >= 0)
write_ndx(sock_f_out, ndx);
write_shortint(sock_f_out, iflags);
if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
write_byte(sock_f_out, fnamecmp_type);
if (iflags & ITEM_XNAME_FOLLOWS)
write_vstring(sock_f_out, xname, strlen(xname));
#ifdef SUPPORT_XATTRS
if (preserve_xattrs && do_xfers
&& iflags & (ITEM_REPORT_XATTR|ITEM_TRANSFER)) {
send_xattr_request(NULL, file,
iflags & ITEM_REPORT_XATTR ? sock_f_out : -1);
}
#endif
} else if (ndx >= 0) {
enum logcode code = logfile_format_has_i ? FINFO : FCLIENT;
log_item(code, file, &stats, iflags, xname);
}
}
}
/* Perform our quick-check heuristic for determining if a file is unchanged. */
int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
{
if (st->st_size != F_LENGTH(file))
return 0;
/* if always checksum is set then we use the checksum instead
of the file time to determine whether to sync */
if (always_checksum > 0 && S_ISREG(st->st_mode)) {
char sum[MAX_DIGEST_LEN];
file_checksum(fn, sum, st->st_size);
return memcmp(sum, F_SUM(file), checksum_len) == 0;
}
if (size_only > 0)
return 1;
if (ignore_times)
return 0;
return cmp_time(st->st_mtime, file->modtime) == 0;
}
/*
* set (initialize) the size entries in the per-file sum_struct
* calculating dynamic block and checksum sizes.
*
* This is only called from generate_and_send_sums() but is a separate
* function to encapsulate the logic.
*
* The block size is a rounded square root of file length.
*
* The checksum size is determined according to:
* blocksum_bits = BLOCKSUM_BIAS + 2*log2(file_len) - log2(block_len)
* provided by Donovan Baarda which gives a probability of rsync
* algorithm corrupting data and falling back using the whole md4
* checksums.
*
* This might be made one of several selectable heuristics.
*/
static void sum_sizes_sqroot(struct sum_struct *sum, int64 len)
{
int32 blength;
int s2length;
int64 l;
if (len < 0) {
/* The file length overflowed our int64 var, so we can't process this file. */
sum->count = -1; /* indicate overflow error */
return;
}
if (block_size)
blength = block_size;
else if (len <= BLOCK_SIZE * BLOCK_SIZE)
blength = BLOCK_SIZE;
else {
int32 max_blength = protocol_version < 30 ? OLD_MAX_BLOCK_SIZE : MAX_BLOCK_SIZE;
int32 c;
int cnt;
for (c = 1, l = len, cnt = 0; l >>= 2; c <<= 1, cnt++) {}
if (c < 0 || c >= max_blength)
blength = max_blength;
else {
blength = 0;
do {
blength |= c;
if (len < (int64)blength * blength)
blength &= ~c;
c >>= 1;
} while (c >= 8); /* round to multiple of 8 */
blength = MAX(blength, BLOCK_SIZE);
}
}
if (protocol_version < 27) {
s2length = csum_length;
} else if (csum_length == SUM_LENGTH) {
s2length = SUM_LENGTH;
} else {
int32 c;
int b = BLOCKSUM_BIAS;
for (l = len; l >>= 1; b += 2) {}
for (c = blength; (c >>= 1) && b; b--) {}
/* add a bit, subtract rollsum, round up. */
s2length = (b + 1 - 32 + 7) / 8; /* --optimize in compiler-- */
s2length = MAX(s2length, csum_length);
s2length = MIN(s2length, SUM_LENGTH);
}
sum->flength = len;
sum->blength = blength;
sum->s2length = s2length;
sum->remainder = (int32)(len % blength);
sum->count = (int32)(l = (len / blength) + (sum->remainder != 0));
if ((int64)sum->count != l)
sum->count = -1;
if (sum->count && verbose > 2) {
rprintf(FINFO,
"count=%.0f rem=%ld blength=%ld s2length=%d flength=%.0f\n",
(double)sum->count, (long)sum->remainder, (long)sum->blength,
sum->s2length, (double)sum->flength);
}
}
/*
* Generate and send a stream of signatures/checksums that describe a buffer
*
* Generate approximately one checksum every block_len bytes.
*/
static int generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
{
int32 i;
struct map_struct *mapbuf;
struct sum_struct sum;
OFF_T offset = 0;
sum_sizes_sqroot(&sum, len);
if (sum.count < 0)
return -1;
write_sum_head(f_out, &sum);
if (append_mode > 0 && f_copy < 0)
return 0;
if (len > 0)
mapbuf = map_file(fd, len, MAX_MAP_SIZE, sum.blength);
else
mapbuf = NULL;
for (i = 0; i < sum.count; i++) {
int32 n1 = (int32)MIN(len, (OFF_T)sum.blength);
char *map = map_ptr(mapbuf, offset, n1);
char sum2[SUM_LENGTH];
uint32 sum1;
len -= n1;
offset += n1;
if (f_copy >= 0) {
full_write(f_copy, map, n1);
if (append_mode > 0)
continue;
}
sum1 = get_checksum1(map, n1);
get_checksum2(map, n1, sum2);
if (verbose > 3) {
rprintf(FINFO,
"chunk[%.0f] offset=%.0f len=%ld sum1=%08lx\n",
(double)i, (double)offset - n1, (long)n1,
(unsigned long)sum1);
}
write_int(f_out, sum1);
write_buf(f_out, sum2, sum.s2length);
}
if (mapbuf)
unmap_file(mapbuf);
return 0;
}
/* Try to find a filename in the same dir as "fname" with a similar name. */
static int find_fuzzy(struct file_struct *file, struct file_list *dirlist)
{
int fname_len, fname_suf_len;
const char *fname_suf, *fname = file->basename;
uint32 lowest_dist = 25 << 16; /* ignore a distance greater than 25 */
int j, lowest_j = -1;
fname_len = strlen(fname);
fname_suf = find_filename_suffix(fname, fname_len, &fname_suf_len);
for (j = 0; j < dirlist->used; j++) {
struct file_struct *fp = dirlist->files[j];
const char *suf, *name;
int len, suf_len;
uint32 dist;
if (!S_ISREG(fp->mode) || !F_LENGTH(fp)
|| fp->flags & FLAG_FILE_SENT)
continue;
name = fp->basename;
if (F_LENGTH(fp) == F_LENGTH(file)
&& cmp_time(fp->modtime, file->modtime) == 0) {
if (verbose > 4) {
rprintf(FINFO,
"fuzzy size/modtime match for %s\n",
name);
}
return j;
}
len = strlen(name);
suf = find_filename_suffix(name, len, &suf_len);
dist = fuzzy_distance(name, len, fname, fname_len);
/* Add some extra weight to how well the suffixes match. */
dist += fuzzy_distance(suf, suf_len, fname_suf, fname_suf_len)
* 10;
if (verbose > 4) {
rprintf(FINFO, "fuzzy distance for %s = %d.%05d\n",
name, (int)(dist>>16), (int)(dist&0xFFFF));
}
if (dist <= lowest_dist) {
lowest_dist = dist;
lowest_j = j;
}
}
return lowest_j;
}
/* Copy a file found in our --copy-dest handling. */
static int copy_altdest_file(const char *src, const char *dest, struct file_struct *file)
{
char buf[MAXPATHLEN];
const char *copy_to, *partialptr;
int save_preserve_xattrs = preserve_xattrs;
int ok, fd_w;
if (inplace) {
/* Let copy_file open the destination in place. */
fd_w = -1;
copy_to = dest;
} else {
fd_w = open_tmpfile(buf, dest, file);
if (fd_w < 0)
return -1;
copy_to = buf;
}
cleanup_set(copy_to, NULL, NULL, -1, -1);
if (copy_file(src, copy_to, fd_w, file->mode, 0) < 0) {
if (verbose) {
rsyserr(FINFO, errno, "copy_file %s => %s",
full_fname(src), copy_to);
}
/* Try to clean up. */
unlink(copy_to);
cleanup_disable();
return -1;