/**
* Stat either a symlink or its referent, depending on the settings of
* copy_links, copy_unsafe_links, etc.
*
* @retval -1 on error
*
* @retval 0 for success
*
* @post If @p path is a symlink, then @p linkbuf (of size @c
* MAXPATHLEN) contains the symlink target.
*
* @post @p buffer contains information about the link or the
* referrent as appropriate, if they exist.
**/
static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
{
#ifdef SUPPORT_LINKS
if (copy_links)
return do_stat(path, buffer);
if (link_stat(path, buffer, 0) < 0)
return -1;
if (S_ISLNK(buffer->st_mode)) {
int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
if (l == -1)
return -1;
linkbuf[l] = 0;
if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
if (verbose > 1) {
rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
safe_fname(path), safe_fname(linkbuf));
}
return do_stat(path, buffer);
}
}
return 0;
#else
return do_stat(path, buffer);
#endif
}
static void hard_link_one(int i)
{
STRUCT_STAT st1, st2;
if (link_stat(f_name(&hlink_list[i - 1]), &st1) != 0)
return;
if (link_stat(f_name(&hlink_list[i]), &st2) != 0) {
if (do_link
(f_name(&hlink_list[i - 1]),
f_name(&hlink_list[i])) != 0) {
if (verbose > 0)
rprintf(FINFO, "link %s => %s : %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]),
strerror(errno));
return;
}
} else {
if (st2.st_dev == st1.st_dev && st2.st_ino == st1.st_ino)
return;
if (robust_unlink(f_name(&hlink_list[i])) != 0 ||
do_link(f_name(&hlink_list[i - 1]),
f_name(&hlink_list[i])) != 0) {
if (verbose > 0)
rprintf(FINFO, "link %s => %s : %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]),
strerror(errno));
return;
}
}
if (verbose > 0)
rprintf(FINFO, "%s => %s\n",
f_name(&hlink_list[i]),
f_name(&hlink_list[i - 1]));
}
/**
* Acts on file number @p i from @p flist, whose name is @p fname.
*
* First fixes up permissions, then generates checksums for the file.
*
* @note This comment was added later by mbp who was trying to work it
* out. It might be wrong.
**/
int recv_generator(char *fname, struct file_list *flist, int i, int f_out)
{
int fd;
STRUCT_STAT st;
struct map_struct *buf;
struct sum_struct *s;
int statret;
struct file_struct *file = flist->files[i];
struct timeval tv_start;
char *fnamecmp;
char fnamecmpbuf[MAXPATHLEN];
extern char *compare_dest;
extern int list_only;
extern int preserve_perms;
extern int only_existing;
extern int orig_umask;
if (list_only) return 0;
if (verbose > 2)
rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
statret = link_stat(fname,&st);
if (only_existing && statret == -1 && errno == ENOENT) {
/* we only want to update existing files */
if (verbose > 1) rprintf(FINFO, "not creating new file \"%s\"\n",fname);
return 0;
}
if (statret == 0 &&
!preserve_perms &&
(S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
/* if the file exists already and we aren't perserving
presmissions then act as though the remote end sent
us the file permissions we already have */
file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
}
if (S_ISDIR(file->mode)) {
/* The file to be received is a directory, so we need
* to prepare appropriately. If there is already a
* file of that name and it is *not* a directory, then
* we need to delete it. If it doesn't exist, then
* recursively create it. */
if (dry_run) return 0; /* XXXX -- might cause inaccuracies?? -- mbp */
if (statret == 0 && !S_ISDIR(st.st_mode)) {
if (robust_unlink(fname) != 0) {
rprintf(FERROR, RSYNC_NAME
": recv_generator: unlink \"%s\" to make room for directory: %s\n",
fname,strerror(errno));
return 0;
}
statret = -1;
}
if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
if (!(relative_paths && errno==ENOENT &&
create_directory_path(fname, orig_umask)==0 &&
do_mkdir(fname,file->mode)==0)) {
rprintf(FERROR, RSYNC_NAME ": recv_generator: mkdir \"%s\": %s (2)\n",
fname,strerror(errno));
}
}
/* f_out is set to -1 when doing final directory
permission and modification time repair */
if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
rprintf(FINFO,"%s/\n",fname);
return 0;
}
if (preserve_links && S_ISLNK(file->mode)) {
#if SUPPORT_LINKS
char lnk[MAXPATHLEN];
int l;
extern int safe_symlinks;
if (safe_symlinks && unsafe_symlink(file->link, fname)) {
if (verbose) {
rprintf(FINFO,"ignoring unsafe symlink \"%s\" -> \"%s\"\n",
fname,file->link);
}
return 0;
}
if (statret == 0) {
l = readlink(fname,lnk,MAXPATHLEN-1);
if (l > 0) {
lnk[l] = 0;
/* A link already pointing to the
* right place -- no further action
* required. */
if (strcmp(lnk,file->link) == 0) {
set_perms(fname,file,&st,1);
return 0;
}
}
/* Not a symlink, so delete whatever's
* already there and put a new symlink
* in place. */
delete_file(fname);
}
if (do_symlink(file->link,fname) != 0) {
rprintf(FERROR,RSYNC_NAME": symlink \"%s\" -> \"%s\": %s\n",
fname,file->link,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose) {
rprintf(FINFO,"%s -> %s\n", fname,file->link);
}
}
#endif
return 0;
}
#ifdef HAVE_MKNOD
if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
if (statret != 0 ||
st.st_mode != file->mode ||
st.st_rdev != file->rdev) {
delete_file(fname);
if (verbose > 2)
rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
fname,(int)file->mode,(int)file->rdev);
if (do_mknod(fname,file->mode,file->rdev) != 0) {
rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose)
rprintf(FINFO,"%s\n",fname);
}
} else {
set_perms(fname,file,&st,1);
}
return 0;
}
#endif
if (preserve_hard_links && check_hard_link(file)) {
if (verbose > 1)
rprintf(FINFO, "recv_generator: \"%s\" is a hard link\n",f_name(file));
return 0;
}
if (!S_ISREG(file->mode)) {
rprintf(FINFO, "skipping non-regular file \"%s\"\n",fname);
return 0;
}
fnamecmp = fname;
if ((statret == -1) && (compare_dest != NULL)) {
/* try the file at compare_dest instead */
int saveerrno = errno;
snprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
statret = link_stat(fnamecmpbuf,&st);
if (!S_ISREG(st.st_mode))
statret = -1;
if (statret == -1)
errno = saveerrno;
else
fnamecmp = fnamecmpbuf;
}
if (statret == -1) {
if (errno == ENOENT) {
write_int(f_out,i);
if (!dry_run) {
if(do_stats){
gettimeofday(&tv_start,0);
rprintf(FINFO, "File start: %s time: %d %d\n",fnamecmp,
tv_start.tv_sec,
tv_start.tv_usec);
}
send_sums(NULL,f_out);
return 1;
}
} else {
if (verbose > 1)
rprintf(FERROR, RSYNC_NAME
": recv_generator failed to open \"%s\": %s\n",
fname, strerror(errno));
return 0;
}
}
if (!S_ISREG(st.st_mode)) {
if (delete_file(fname) != 0) {
return 0;
}
if(do_stats){
gettimeofday(&tv_start,0);
rprintf(FINFO, "File start: %s time: %d %d\n",fnamecmp,
tv_start.tv_sec,
tv_start.tv_usec);
}
/* now pretend the file didn't exist */
write_int(f_out,i);
if (!dry_run) send_sums(NULL,f_out);
return 1;
}
if (opt_ignore_existing && fnamecmp == fname) {
if (verbose > 1)
rprintf(FINFO,"%s exists\n",fname);
return 0;
}
if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
if (verbose > 1)
rprintf(FINFO,"%s is newer\n",fname);
return 0;
}
if (skip_file(fname, file, &st)) {
if (fnamecmp == fname)
set_perms(fname,file,&st,1);
return 0;
}
if (dry_run) {
if(do_stats){
gettimeofday(&tv_start,0);
rprintf(FINFO, "File start: %s time: %d %d\n",fnamecmp,
tv_start.tv_sec,
tv_start.tv_usec);
}
write_int(f_out,i);
return 1;
}
if (disable_deltas_p()) {
if(do_stats){
gettimeofday(&tv_start,0);
rprintf(FINFO, "File start: %s time: %d %d\n",fnamecmp,
tv_start.tv_sec,
tv_start.tv_usec);
}
write_int(f_out,i);
send_sums(NULL,f_out);
return 1;
}
if(do_stats){
gettimeofday(&tv_start,0);
rprintf(FINFO, "File start: %s time: %d %d\n",fnamecmp,
tv_start.tv_sec,
tv_start.tv_usec);
}
/* open the file */
fd = do_open(fnamecmp, O_RDONLY, 0);
if (fd == -1) {
rprintf(FERROR,RSYNC_NAME": failed to open \"%s\", continuing : %s\n",fnamecmp,strerror(errno));
/* pretend the file didn't exist */
write_int(f_out,i);
send_sums(NULL,f_out);
return 1;
}
if (st.st_size > 0) {
buf = map_file(fd,st.st_size);
} else {
buf = NULL;
}
if (verbose > 3)
rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
if(do_stats){
timing(TIMING_START);
}
s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
if(do_stats){
rprintf(FINFO, "Generator: %s %s\n", fnamecmp,timing(TIMING_END));
}
if (verbose > 2)
rprintf(FINFO,"sending sums for %d\n",i);
write_int(f_out,i);
if(do_stats){
timing(TIMING_START);
}
send_sums(s,f_out);
if(do_stats){
rprintf(FINFO, "Send sums: %s %s\n", fnamecmp,timing(TIMING_END));
}
close(fd);
if (buf) unmap_file(buf);
free_sums(s);
return 1;
}
int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
int report)
{
int updated = 0;
STRUCT_STAT st2;
int change_uid, change_gid;
extern int am_daemon;
if (dry_run) return 0;
if (!st) {
if (link_stat(fname,&st2) != 0) {
rprintf(FERROR,"stat %s : %s\n",fname,strerror(errno));
return 0;
}
st = &st2;
}
if (preserve_times && !S_ISLNK(st->st_mode) &&
st->st_mtime != file->modtime) {
/* don't complain about not setting times on directories
because some filesystems can't do it */
if (set_modtime(fname,file->modtime) != 0 &&
!S_ISDIR(st->st_mode)) {
rprintf(FERROR,"failed to set times on %s : %s\n",
fname,strerror(errno));
return 0;
} else {
updated = 1;
}
}
change_uid = am_root && preserve_uid && st->st_uid != file->uid;
change_gid = !am_daemon && preserve_gid && file->gid != (gid_t) -1 && \
st->st_gid != file->gid;
if (change_gid && !am_root) {
/* enforce bsd-style group semantics: non-root can only
change to groups that the user is a member of */
change_gid = is_in_group(file->gid);
}
if (change_uid || change_gid) {
if (do_lchown(fname,
change_uid?file->uid:st->st_uid,
change_gid?file->gid:st->st_gid) != 0) {
/* shouldn't have attempted to change uid or gid
unless have the privilege */
rprintf(FERROR,"chown %s : %s\n", fname,strerror(errno));
return 0;
}
updated = 1;
}
#ifdef HAVE_CHMOD
if (!S_ISLNK(st->st_mode)) {
int file_mode;
if (preserve_perms)
file_mode = file->mode;
else
file_mode = file->mode & ACCESSPERMS;
if (st->st_mode != file->mode) {
updated = 1;
if (do_chmod(fname,file_mode) != 0) {
rprintf(FERROR,"failed to set permissions on %s : %s\n",
fname,strerror(errno));
return 0;
}
}
}
#endif
if (verbose > 1 && report) {
if (updated)
rprintf(FINFO,"%s\n",fname);
else
rprintf(FINFO,"%s is uptodate\n",fname);
}
return updated;
}
void recv_generator(char *fname,struct file_list *flist,int i,int f_out)
{
int fd;
STRUCT_STAT st;
struct map_struct *buf;
struct sum_struct *s;
int statret;
struct file_struct *file = flist->files[i];
char *fnamecmp;
char fnamecmpbuf[MAXPATHLEN];
extern char *compare_dest;
extern int list_only;
if (list_only) return;
if (verbose > 2)
rprintf(FINFO,"recv_generator(%s,%d)\n",fname,i);
statret = link_stat(fname,&st);
if (S_ISDIR(file->mode)) {
if (dry_run) return;
if (statret == 0 && !S_ISDIR(st.st_mode)) {
if (robust_unlink(fname) != 0) {
rprintf(FERROR,"unlink %s : %s\n",fname,strerror(errno));
return;
}
statret = -1;
}
if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
if (!(relative_paths && errno==ENOENT &&
create_directory_path(fname)==0 &&
do_mkdir(fname,file->mode)==0)) {
rprintf(FERROR,"mkdir %s : %s (2)\n",
fname,strerror(errno));
}
}
if (set_perms(fname,file,NULL,0) && verbose)
rprintf(FINFO,"%s/\n",fname);
return;
}
if (preserve_links && S_ISLNK(file->mode)) {
#if SUPPORT_LINKS
char lnk[MAXPATHLEN];
int l;
extern int safe_symlinks;
if (safe_symlinks && unsafe_symlink(file->link, fname)) {
if (verbose) {
rprintf(FINFO,"ignoring unsafe symlink %s -> %s\n",
fname,file->link);
}
return;
}
if (statret == 0) {
l = readlink(fname,lnk,MAXPATHLEN-1);
if (l > 0) {
lnk[l] = 0;
if (strcmp(lnk,file->link) == 0) {
set_perms(fname,file,&st,1);
return;
}
}
}
delete_file(fname);
if (do_symlink(file->link,fname) != 0) {
rprintf(FERROR,"link %s -> %s : %s\n",
fname,file->link,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose) {
rprintf(FINFO,"%s -> %s\n",
fname,file->link);
}
}
#endif
return;
}
#ifdef HAVE_MKNOD
if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
if (statret != 0 ||
st.st_mode != file->mode ||
st.st_rdev != file->rdev) {
delete_file(fname);
if (verbose > 2)
rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
fname,(int)file->mode,(int)file->rdev);
if (do_mknod(fname,file->mode,file->rdev) != 0) {
rprintf(FERROR,"mknod %s : %s\n",fname,strerror(errno));
} else {
set_perms(fname,file,NULL,0);
if (verbose)
rprintf(FINFO,"%s\n",fname);
}
} else {
set_perms(fname,file,&st,1);
}
return;
}
#endif
if (preserve_hard_links && check_hard_link(file)) {
if (verbose > 1)
rprintf(FINFO,"%s is a hard link\n",f_name(file));
return;
}
if (!S_ISREG(file->mode)) {
rprintf(FINFO,"skipping non-regular file %s\n",fname);
return;
}
fnamecmp = fname;
if ((statret == -1) && (compare_dest != NULL)) {
/* try the file at compare_dest instead */
int saveerrno = errno;
slprintf(fnamecmpbuf,MAXPATHLEN,"%s/%s",compare_dest,fname);
statret = link_stat(fnamecmpbuf,&st);
if (!S_ISREG(st.st_mode))
statret = -1;
if (statret == -1)
errno = saveerrno;
else
fnamecmp = fnamecmpbuf;
}
if (statret == -1) {
if (errno == ENOENT) {
write_int(f_out,i);
if (!dry_run) send_sums(NULL,f_out);
} else {
if (verbose > 1)
rprintf(FERROR,"recv_generator failed to open %s\n",fname);
}
return;
}
if (!S_ISREG(st.st_mode)) {
if (delete_file(fname) != 0) {
return;
}
/* now pretend the file didn't exist */
write_int(f_out,i);
if (!dry_run) send_sums(NULL,f_out);
return;
}
if (update_only && st.st_mtime > file->modtime && fnamecmp == fname) {
if (verbose > 1)
rprintf(FINFO,"%s is newer\n",fname);
return;
}
if (skip_file(fname, file, &st)) {
if (fnamecmp == fname)
set_perms(fname,file,&st,1);
return;
}
if (dry_run) {
write_int(f_out,i);
return;
}
if (whole_file) {
write_int(f_out,i);
send_sums(NULL,f_out);
return;
}
/* open the file */
fd = open(fnamecmp,O_RDONLY);
if (fd == -1) {
rprintf(FERROR,"failed to open %s : %s\n",fnamecmp,strerror(errno));
rprintf(FERROR,"skipping %s\n",fname);
return;
}
if (st.st_size > 0) {
buf = map_file(fd,st.st_size);
} else {
buf = NULL;
}
if (verbose > 3)
rprintf(FINFO,"gen mapped %s of size %d\n",fnamecmp,(int)st.st_size);
s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
if (verbose > 2)
rprintf(FINFO,"sending sums for %d\n",i);
write_int(f_out,i);
send_sums(s,f_out);
close(fd);
if (buf) unmap_file(buf);
free_sums(s);
}
