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flist.c
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flist.c
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/*
Copyright (C) Andrew Tridgell 1996
Copyright (C) Paul Mackerras 1996
Copyright (C) 2001, 2002 by Martin Pool <[email protected]>
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.
*/
/** @file flist.c
* Generate and receive file lists
*
* @todo Get rid of the string_area optimization. Efficiently
* allocating blocks is the responsibility of the system's malloc
* library, not of rsync.
*
* @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
*
**/
#include "rsync.h"
extern struct stats stats;
extern int verbose;
extern int do_progress;
extern int am_server;
extern int always_checksum;
extern int cvs_exclude;
extern int recurse;
extern int one_file_system;
extern int make_backups;
extern int preserve_links;
extern int preserve_hard_links;
extern int preserve_perms;
extern int preserve_devices;
extern int preserve_uid;
extern int preserve_gid;
extern int preserve_times;
extern int relative_paths;
extern int copy_links;
extern int copy_unsafe_links;
extern int remote_version;
extern int io_error;
extern int sanitize_paths;
extern int read_batch;
extern int write_batch;
static char topsrcname[MAXPATHLEN];
static struct exclude_struct **local_exclude_list;
static struct file_struct null_file;
static void clean_flist(struct file_list *flist, int strip_root);
static int show_filelist_p(void)
{
return verbose && recurse && !am_server;
}
static void start_filelist_progress(char *kind)
{
rprintf(FINFO, "%s ... ", kind);
if ((verbose > 1) || do_progress)
rprintf(FINFO, "\n");
rflush(FINFO);
}
static void emit_filelist_progress(const struct file_list *flist)
{
rprintf(FINFO, " %d files...\r", flist->count);
}
static void maybe_emit_filelist_progress(const struct file_list *flist)
{
if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
emit_filelist_progress(flist);
}
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 struct string_area *string_area_new(int size)
{
struct string_area *a;
if (size <= 0)
size = ARENA_SIZE;
a = malloc(sizeof(*a));
if (!a)
out_of_memory("string_area_new");
a->current = a->base = malloc(size);
if (!a->current)
out_of_memory("string_area_new buffer");
a->end = a->base + size;
a->next = NULL;
return a;
}
static void string_area_free(struct string_area *a)
{
struct string_area *next;
for (; a; a = next) {
next = a->next;
free(a->base);
}
}
static char *string_area_malloc(struct string_area **ap, int size)
{
char *p;
struct string_area *a;
/* does the request fit into the current space? */
a = *ap;
if (a->current + size >= a->end) {
/* no; get space, move new string_area to front of the list */
a = string_area_new(size > ARENA_SIZE ? size : ARENA_SIZE);
a->next = *ap;
*ap = a;
}
/* have space; do the "allocation." */
p = a->current;
a->current += size;
return p;
}
static char *string_area_strdup(struct string_area **ap, const char *src)
{
char *dest = string_area_malloc(ap, strlen(src) + 1);
return strcpy(dest, src);
}
static void list_file_entry(struct file_struct *f)
{
char perms[11];
if (!f->basename)
/* this can happen if duplicate names were removed */
return;
permstring(perms, f->mode);
if (preserve_links && S_ISLNK(f->mode)) {
rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
perms,
(double) f->length, timestring(f->modtime),
f_name(f), f->link);
} else {
rprintf(FINFO, "%s %11.0f %s %s\n",
perms,
(double) f->length, timestring(f->modtime),
f_name(f));
}
}
int readlink_stat(const char *Path, STRUCT_STAT * Buffer, char *Linkbuf)
{
#if SUPPORT_LINKS
if (copy_links) {
return do_stat(Path, Buffer);
}
if (do_lstat(Path, Buffer) == -1) {
return -1;
}
if (S_ISLNK(Buffer->st_mode)) {
int l;
if ((l =
readlink((char *) Path, Linkbuf,
MAXPATHLEN - 1)) == -1) {
return -1;
}
Linkbuf[l] = 0;
if (copy_unsafe_links && (topsrcname[0] != '\0') &&
unsafe_symlink(Linkbuf, topsrcname)) {
return do_stat(Path, Buffer);
}
}
return 0;
#else
return do_stat(Path, Buffer);
#endif
}
int link_stat(const char *Path, STRUCT_STAT * Buffer)
{
#if SUPPORT_LINKS
if (copy_links) {
return do_stat(Path, Buffer);
} else {
return do_lstat(Path, Buffer);
}
#else
return do_stat(Path, Buffer);
#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
*/
static int check_exclude_file(int f, char *fname, STRUCT_STAT * st)
{
extern int delete_excluded;
/* f is set to -1 when calculating deletion file list */
if ((f == -1) && delete_excluded) {
return 0;
}
if (check_exclude(fname, local_exclude_list, st)) {
return 1;
}
return 0;
}
/* used by the one_file_system code */
static dev_t filesystem_dev;
static void set_filesystem(char *fname)
{
STRUCT_STAT st;
if (link_stat(fname, &st) != 0)
return;
filesystem_dev = st.st_dev;
}
static int to_wire_mode(mode_t mode)
{
if (S_ISLNK(mode) && (_S_IFLNK != 0120000)) {
return (mode & ~(_S_IFMT)) | 0120000;
}
return (int) mode;
}
static mode_t from_wire_mode(int mode)
{
if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000)) {
return (mode & ~(_S_IFMT)) | _S_IFLNK;
}
return (mode_t) mode;
}
static void send_directory(int f, struct file_list *flist, char *dir);
static char *flist_dir;
/**
* Make sure @p flist is big enough to hold at least @p flist->count
* entries.
**/
static void flist_expand(struct file_list *flist)
{
if (flist->count >= flist->malloced) {
size_t new_bytes;
void *new_ptr;
if (flist->malloced < 1000)
flist->malloced += 1000;
else
flist->malloced *= 2;
new_bytes = sizeof(flist->files[0]) * flist->malloced;
if (flist->files)
new_ptr = realloc(flist->files, new_bytes);
else
new_ptr = malloc(new_bytes);
if (verbose >= 2) {
rprintf(FINFO, "expand file_list to %.0f bytes, did%s move\n",
(double) new_bytes,
(new_ptr == flist->files) ? " not" : "");
}
flist->files = (struct file_struct **) new_ptr;
if (!flist->files)
out_of_memory("flist_expand");
}
}
static void send_file_entry(struct file_struct *file, int f,
unsigned base_flags)
{
unsigned char flags;
static time_t last_time;
static mode_t last_mode;
static DEV64_T last_rdev;
static uid_t last_uid;
static gid_t last_gid;
static char lastname[MAXPATHLEN];
char *fname;
int l1, l2;
if (f == -1)
return;
if (!file) {
write_byte(f, 0);
return;
}
fname = f_name(file);
flags = base_flags;
if (file->mode == last_mode)
flags |= SAME_MODE;
if (file->rdev == last_rdev)
flags |= SAME_RDEV;
if (file->uid == last_uid)
flags |= SAME_UID;
if (file->gid == last_gid)
flags |= SAME_GID;
if (file->modtime == last_time)
flags |= SAME_TIME;
for (l1 = 0;
lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
l1++);
l2 = strlen(fname) - l1;
if (l1 > 0)
flags |= SAME_NAME;
if (l2 > 255)
flags |= LONG_NAME;
/* we must make sure we don't send a zero flags byte or the other
end will terminate the flist transfer */
if (flags == 0 && !S_ISDIR(file->mode))
flags |= FLAG_DELETE;
if (flags == 0)
flags |= LONG_NAME;
write_byte(f, flags);
if (flags & SAME_NAME)
write_byte(f, l1);
if (flags & LONG_NAME)
write_int(f, l2);
else
write_byte(f, l2);
write_buf(f, fname + l1, l2);
write_longint(f, file->length);
if (!(flags & SAME_TIME))
write_int(f, (int) file->modtime);
if (!(flags & SAME_MODE))
write_int(f, to_wire_mode(file->mode));
if (preserve_uid && !(flags & SAME_UID)) {
add_uid(file->uid);
write_int(f, (int) file->uid);
}
if (preserve_gid && !(flags & SAME_GID)) {
add_gid(file->gid);
write_int(f, (int) file->gid);
}
if (preserve_devices && IS_DEVICE(file->mode)
&& !(flags & SAME_RDEV))
write_int(f, (int) file->rdev);
#if SUPPORT_LINKS
if (preserve_links && S_ISLNK(file->mode)) {
write_int(f, strlen(file->link));
write_buf(f, file->link, strlen(file->link));
}
#endif
#if SUPPORT_HARD_LINKS
if (preserve_hard_links && S_ISREG(file->mode)) {
if (remote_version < 26) {
/* 32-bit dev_t and ino_t */
write_int(f, (int) file->dev);
write_int(f, (int) file->inode);
} else {
/* 64-bit dev_t and ino_t */
write_longint(f, file->dev);
write_longint(f, file->inode);
}
}
#endif
if (always_checksum) {
if (remote_version < 21) {
write_buf(f, file->sum, 2);
} else {
write_buf(f, file->sum, MD4_SUM_LENGTH);
}
}
last_mode = file->mode;
last_rdev = file->rdev;
last_uid = file->uid;
last_gid = file->gid;
last_time = file->modtime;
strlcpy(lastname, fname, MAXPATHLEN);
lastname[MAXPATHLEN - 1] = 0;
}
static void receive_file_entry(struct file_struct **fptr,
unsigned flags, int f)
{
static time_t last_time;
static mode_t last_mode;
static DEV64_T last_rdev;
static uid_t last_uid;
static gid_t last_gid;
static char lastname[MAXPATHLEN];
char thisname[MAXPATHLEN];
unsigned int l1 = 0, l2 = 0;
char *p;
struct file_struct *file;
if (flags & SAME_NAME)
l1 = read_byte(f);
if (flags & LONG_NAME)
l2 = read_int(f);
else
l2 = read_byte(f);
file = (struct file_struct *) malloc(sizeof(*file));
if (!file)
out_of_memory("receive_file_entry");
memset((char *) file, 0, sizeof(*file));
(*fptr) = file;
if (l2 >= MAXPATHLEN - l1) {
rprintf(FERROR,
"overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
flags, l1, l2, lastname);
overflow("receive_file_entry");
}
strlcpy(thisname, lastname, l1 + 1);
read_sbuf(f, &thisname[l1], l2);
thisname[l1 + l2] = 0;
strlcpy(lastname, thisname, MAXPATHLEN);
lastname[MAXPATHLEN - 1] = 0;
clean_fname(thisname);
if (sanitize_paths) {
sanitize_path(thisname, NULL);
}
if ((p = strrchr(thisname, '/'))) {
static char *lastdir;
*p = 0;
if (lastdir && strcmp(thisname, lastdir) == 0) {
file->dirname = lastdir;
} else {
file->dirname = strdup(thisname);
lastdir = file->dirname;
}
file->basename = strdup(p + 1);
} else {
file->dirname = NULL;
file->basename = strdup(thisname);
}
if (!file->basename)
out_of_memory("receive_file_entry 1");
file->flags = flags;
file->length = read_longint(f);
file->modtime =
(flags & SAME_TIME) ? last_time : (time_t) read_int(f);
file->mode =
(flags & SAME_MODE) ? last_mode : from_wire_mode(read_int(f));
if (preserve_uid)
file->uid =
(flags & SAME_UID) ? last_uid : (uid_t) read_int(f);
if (preserve_gid)
file->gid =
(flags & SAME_GID) ? last_gid : (gid_t) read_int(f);
if (preserve_devices && IS_DEVICE(file->mode))
file->rdev =
(flags & SAME_RDEV) ? last_rdev : (dev_t) read_int(f);
if (preserve_links && S_ISLNK(file->mode)) {
int l = read_int(f);
if (l < 0) {
rprintf(FERROR, "overflow: l=%d\n", l);
overflow("receive_file_entry");
}
file->link = (char *) malloc(l + 1);
if (!file->link)
out_of_memory("receive_file_entry 2");
read_sbuf(f, file->link, l);
if (sanitize_paths) {
sanitize_path(file->link, file->dirname);
}
}
#if SUPPORT_HARD_LINKS
if (preserve_hard_links && S_ISREG(file->mode)) {
if (remote_version < 26) {
file->dev = read_int(f);
file->inode = read_int(f);
} else {
file->dev = read_longint(f);
file->inode = read_longint(f);
}
}
#endif
if (always_checksum) {
file->sum = (char *) malloc(MD4_SUM_LENGTH);
if (!file->sum)
out_of_memory("md4 sum");
if (remote_version < 21) {
read_buf(f, file->sum, 2);
} else {
read_buf(f, file->sum, MD4_SUM_LENGTH);
}
}
last_mode = file->mode;
last_rdev = file->rdev;
last_uid = file->uid;
last_gid = file->gid;
last_time = file->modtime;
if (!preserve_perms) {
extern int orig_umask;
/* set an appropriate set of permissions based on original
permissions and umask. This emulates what GNU cp does */
file->mode &= ~orig_umask;
}
}
/* determine if a file in a different filesstem should be skipped
when one_file_system is set. We bascally only want to include
the mount points - but they can be hard to find! */
static int skip_filesystem(char *fname, STRUCT_STAT * st)
{
STRUCT_STAT st2;
char *p = strrchr(fname, '/');
/* skip all but directories */
if (!S_ISDIR(st->st_mode))
return 1;
/* if its not a subdirectory then allow */
if (!p)
return 0;
*p = 0;
if (link_stat(fname, &st2)) {
*p = '/';
return 0;
}
*p = '/';
return (st2.st_dev != filesystem_dev);
}
#define STRDUP(ap, p) (ap ? string_area_strdup(ap, p) : strdup(p))
/* IRIX cc cares that the operands to the ternary have the same type. */
#define MALLOC(ap, i) (ap ? (void*) string_area_malloc(ap, i) : malloc(i))
/**
* 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(int f, char *fname, struct string_area **ap,
int noexcludes)
{
struct file_struct *file;
STRUCT_STAT st;
char sum[SUM_LENGTH];
char *p;
char cleaned_name[MAXPATHLEN];
char linkbuf[MAXPATHLEN];
extern int module_id;
strlcpy(cleaned_name, fname, MAXPATHLEN);
cleaned_name[MAXPATHLEN - 1] = 0;
clean_fname(cleaned_name);
if (sanitize_paths) {
sanitize_path(cleaned_name, NULL);
}
fname = cleaned_name;
memset(sum, 0, SUM_LENGTH);
if (readlink_stat(fname, &st, linkbuf) != 0) {
int save_errno = errno;
if ((errno == ENOENT) && copy_links && !noexcludes) {
/* symlink pointing nowhere, see if excluded */
memset((char *) &st, 0, sizeof(st));
if (check_exclude_file(f, fname, &st)) {
/* file is excluded anyway, ignore silently */
return NULL;
}
}
io_error = 1;
rprintf(FERROR, "readlink %s: %s\n",
fname, strerror(save_errno));
return NULL;
}
/* we use noexcludes from backup.c */
if (noexcludes)
goto skip_excludes;
if (S_ISDIR(st.st_mode) && !recurse) {
rprintf(FINFO, "skipping directory %s\n", fname);
return NULL;
}
if (one_file_system && st.st_dev != filesystem_dev) {
if (skip_filesystem(fname, &st))
return NULL;
}
if (check_exclude_file(f, fname, &st))
return NULL;
if (lp_ignore_nonreadable(module_id) && access(fname, R_OK) != 0)
return NULL;
skip_excludes:
if (verbose > 2)
rprintf(FINFO, "make_file(%d,%s)\n", f, fname);
file = (struct file_struct *) malloc(sizeof(*file));
if (!file)
out_of_memory("make_file");
memset((char *) file, 0, sizeof(*file));
if ((p = strrchr(fname, '/'))) {
static char *lastdir;
*p = 0;
if (lastdir && strcmp(fname, lastdir) == 0) {
file->dirname = lastdir;
} else {
file->dirname = strdup(fname);
lastdir = file->dirname;
}
file->basename = STRDUP(ap, p + 1);
*p = '/';
} else {
file->dirname = NULL;
file->basename = STRDUP(ap, fname);
}
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;
file->dev = st.st_dev;
file->inode = st.st_ino;
#ifdef HAVE_STRUCT_STAT_ST_RDEV
file->rdev = st.st_rdev;
#endif
#if SUPPORT_LINKS
if (S_ISLNK(st.st_mode)) {
file->link = STRDUP(ap, linkbuf);
}
#endif
if (always_checksum) {
file->sum = (char *) MALLOC(ap, MD4_SUM_LENGTH);
if (!file->sum)
out_of_memory("md4 sum");
/* drat. we have to provide a null checksum for non-regular
files in order to be compatible with earlier versions
of rsync */
if (S_ISREG(st.st_mode)) {
file_checksum(fname, file->sum, st.st_size);
} else {
memset(file->sum, 0, MD4_SUM_LENGTH);
}
}
if (flist_dir) {
static char *lastdir;
if (lastdir && strcmp(lastdir, flist_dir) == 0) {
file->basedir = lastdir;
} else {
file->basedir = strdup(flist_dir);
lastdir = file->basedir;
}
} else {
file->basedir = NULL;
}
if (!S_ISDIR(st.st_mode))
stats.total_size += st.st_size;
return file;
}
void send_file_name(int f, struct file_list *flist, char *fname,
int recursive, unsigned base_flags)
{
struct file_struct *file;
file = make_file(f, fname, &flist->string_area, 0);
if (!file)
return;
maybe_emit_filelist_progress(flist);
flist_expand(flist);
if (write_batch) /* dw */
file->flags = FLAG_DELETE;
if (strcmp(file->basename, "")) {
flist->files[flist->count++] = file;
send_file_entry(file, f, base_flags);
}
if (S_ISDIR(file->mode) && recursive) {
struct exclude_struct **last_exclude_list =
local_exclude_list;
send_directory(f, flist, f_name(file));
local_exclude_list = last_exclude_list;
return;
}
}
static void send_directory(int f, struct file_list *flist, char *dir)
{
DIR *d;
struct dirent *di;
char fname[MAXPATHLEN];
int l;
char *p;
d = opendir(dir);
if (!d) {
io_error = 1;
rprintf(FERROR, "opendir(%s): %s\n", dir, strerror(errno));
return;
}
strlcpy(fname, dir, MAXPATHLEN);
l = strlen(fname);
if (fname[l - 1] != '/') {
if (l == MAXPATHLEN - 1) {
io_error = 1;
rprintf(FERROR,
"skipping long-named directory %s\n",
fname);
closedir(d);
return;
}
strlcat(fname, "/", MAXPATHLEN);
l++;
}
p = fname + strlen(fname);
local_exclude_list = NULL;
if (cvs_exclude) {
if (strlen(fname) + strlen(".cvsignore") <= MAXPATHLEN - 1) {
strcpy(p, ".cvsignore");
local_exclude_list =
make_exclude_list(fname, NULL, 0, 0);
} else {
io_error = 1;
rprintf(FINFO,
"cannot cvs-exclude in long-named directory %s\n",
fname);
}
}
for (di = readdir(d); di; di = readdir(d)) {
char *dname = d_name(di);
if (strcmp(dname, ".") == 0 || strcmp(dname, "..") == 0)
continue;
strlcpy(p, dname, MAXPATHLEN - l);
send_file_name(f, flist, fname, recurse, 0);
}
if (local_exclude_list) {
add_exclude_list("!", &local_exclude_list, 0);
}
closedir(d);
}
/*
*
* I *think* f==-1 means that the list should just be built in memory
* and not transmitted. But who can tell? -- mbp
*/
struct file_list *send_file_list(int f, int argc, char *argv[])
{
int i, l;
STRUCT_STAT st;
char *p, *dir, *olddir;
char lastpath[MAXPATHLEN] = "";
struct file_list *flist;
int64 start_write;
if (show_filelist_p() && f != -1)
start_filelist_progress("building file list");
start_write = stats.total_written;
flist = flist_new();
if (f != -1) {
io_start_buffering(f);
}
for (i = 0; i < argc; i++) {
char *fname = topsrcname;
strlcpy(fname, argv[i], MAXPATHLEN);
l = strlen(fname);
if (l != 1 && fname[l - 1] == '/') {
if ((l == 2) && (fname[0] == '.')) {
/* Turn ./ into just . rather than ./.
This was put in to avoid a problem with
rsync -aR --delete from ./
The send_file_name() below of ./ was
mysteriously preventing deletes */
fname[1] = 0;
} else {
strlcat(fname, ".", MAXPATHLEN);
}
}
if (link_stat(fname, &st) != 0) {
if (f != -1) {
io_error = 1;
rprintf(FERROR, "link_stat %s : %s\n",
fname, strerror(errno));
}
continue;
}
if (S_ISDIR(st.st_mode) && !recurse) {
rprintf(FINFO, "skipping directory %s\n", fname);
continue;
}
dir = NULL;
olddir = NULL;
if (!relative_paths) {
p = strrchr(fname, '/');
if (p) {
*p = 0;
if (p == fname)
dir = "/";
else
dir = fname;
fname = p + 1;
}
} else if (f != -1 && (p = strrchr(fname, '/'))) {
/* this ensures we send the intermediate directories,
thus getting their permissions right */
*p = 0;
if (strcmp(lastpath, fname)) {
strlcpy(lastpath, fname, sizeof(lastpath));
*p = '/';
for (p = fname + 1; (p = strchr(p, '/'));
p++) {
int copy_links_saved = copy_links;
int recurse_saved = recurse;
*p = 0;
copy_links = copy_unsafe_links;
/* set recurse to 1 to prevent make_file
from ignoring directory, but still
turn off the recursive parameter to
send_file_name */
recurse = 1;
send_file_name(f, flist, fname, 0,
0);
copy_links = copy_links_saved;
recurse = recurse_saved;
*p = '/';
}
} else {
*p = '/';
}
}
if (!*fname)
fname = ".";
if (dir && *dir) {
olddir = push_dir(dir, 1);
if (!olddir) {
io_error = 1;
rprintf(FERROR, "push_dir %s : %s\n",
dir, strerror(errno));
continue;
}
flist_dir = dir;
}
if (one_file_system)
set_filesystem(fname);
send_file_name(f, flist, fname, recurse, FLAG_DELETE);
if (olddir != NULL) {
flist_dir = NULL;
if (pop_dir(olddir) != 0) {
rprintf(FERROR, "pop_dir %s : %s\n",
dir, strerror(errno));
exit_cleanup(RERR_FILESELECT);
}
}
}
topsrcname[0] = '\0';
if (f != -1) {
send_file_entry(NULL, f, 0);
}
if (show_filelist_p() && f != -1) {
finish_filelist_progress(flist);
}
clean_flist(flist, 0);
/* now send the uid/gid list. This was introduced in protocol
version 15 */
if (f != -1 && remote_version >= 15) {
send_uid_list(f);