/**
* main routine for receiver process.
*
* Receiver process runs on the same host as the generator process. */
int recv_files(int f_in, char *local_name)
{
int fd1,fd2;
STRUCT_STAT st;
int iflags, xlen;
char *fname, fbuf[MAXPATHLEN];
char xname[MAXPATHLEN];
char fnametmp[MAXPATHLEN];
char *fnamecmp, *partialptr;
char fnamecmpbuf[MAXPATHLEN];
uchar fnamecmp_type;
struct file_struct *file;
struct stats initial_stats;
int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
enum logcode log_code = log_before_transfer ? FLOG : FINFO;
int max_phase = protocol_version >= 29 ? 2 : 1;
int dflt_perms = (ACCESSPERMS & ~orig_umask);
#if 0 /* was SUPPORT_ACLS */
const char *parent_dirname = "";
#endif
int ndx, recv_ok;
if (verbose > 2)
rprintf(FINFO, "recv_files(%d) starting\n", cur_flist->used);
if (delay_updates)
delayed_bits = bitbag_create(cur_flist->used + 1);
while (1) {
struct sum_struct sum;
int numMatchTokens = -1, nextToken = 0;
char *nextData = NULL;
static char file_sum[MAX_DIGEST_LEN];
cleanup_disable();
/* This call also sets cur_flist. */
ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
xname, &xlen);
if (ndx == NDX_DONE) {
if (inc_recurse && first_flist) {
if (read_batch)
gen_wants_ndx(first_flist->used + first_flist->ndx_start);
flist_free(first_flist);
if (first_flist)
continue;
} else if (read_batch && first_flist)
gen_wants_ndx(first_flist->used);
if (++phase > max_phase)
break;
if (verbose > 2)
rprintf(FINFO, "recv_files phase=%d\n", phase);
if (phase == 2 && delay_updates)
handle_delayed_updates(local_name);
send_msg(MSG_DONE, "", 0, 0);
continue;
}
if (ndx - cur_flist->ndx_start >= 0)
file = cur_flist->files[ndx - cur_flist->ndx_start];
else
file = dir_flist->files[cur_flist->parent_ndx];
fname = local_name ? local_name : f_name(file, fbuf);
if (verbose > 2)
rprintf(FINFO, "recv_files(%s)\n", fname);
#ifdef SUPPORT_XATTRS
if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers)
recv_xattr_request(file, f_in);
#endif
if (!(iflags & ITEM_TRANSFER)) {
maybe_log_item(file, iflags, itemizing, xname);
#ifdef SUPPORT_XATTRS
if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
&& !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE))
set_file_attrs(fname, file, NULL, fname, 0);
#endif
continue;
}
if (phase == 2) {
rprintf(FERROR,
"got transfer request in phase 2 [%s]\n",
who_am_i());
exit_cleanup(RERR_PROTOCOL);
}
if (file->flags & FLAG_FILE_SENT) {
if (csum_length == SHORT_SUM_LENGTH) {
if (keep_partial && !partial_dir)
make_backups = -make_backups; /* prevents double backup */
if (append_mode)
sparse_files = -sparse_files;
append_mode = -append_mode;
csum_length = SUM_LENGTH;
redoing = 1;
}
} else {
if (csum_length != SHORT_SUM_LENGTH) {
if (keep_partial && !partial_dir)
make_backups = -make_backups;
if (append_mode)
sparse_files = -sparse_files;
append_mode = -append_mode;
csum_length = SHORT_SUM_LENGTH;
redoing = 0;
}
}
if (!am_server && do_progress)
set_current_file_index(file, ndx);
stats.num_transferred_files++;
stats.total_transferred_size += F_LENGTH(file);
cleanup_got_literal = 0;
if (daemon_filter_list.head
&& check_filter(&daemon_filter_list, FLOG, fname, 0) < 0) {
rprintf(FERROR, "attempt to hack rsync failed.\n");
exit_cleanup(RERR_PROTOCOL);
}
read_sum_head(f_in, &sum);
if (read_batch) {
int wanted = redoing
? we_want_redo(ndx)
: gen_wants_ndx(ndx);
if (!wanted) {
rprintf(FINFO,
"(Skipping batched update for%s \"%s\")\n",
redoing ? " resend of" : "",
fname);
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
file->flags |= FLAG_FILE_SENT;
continue;
}
}
if (!do_xfers) { /* log the transfer */
log_item(FCLIENT, file, &stats, iflags, NULL);
if (read_batch)
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
continue;
}
if (write_batch < 0) {
log_item(FCLIENT, file, &stats, iflags, NULL);
if (!am_server)
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
continue;
}
partialptr = partial_dir ? partial_dir_fname(fname) : fname;
if (protocol_version >= 29) {
switch (fnamecmp_type) {
case FNAMECMP_FNAME:
fnamecmp = fname;
break;
case FNAMECMP_PARTIAL_DIR:
fnamecmp = partialptr;
break;
case FNAMECMP_BACKUP:
fnamecmp = get_backup_name(fname);
break;
case FNAMECMP_FUZZY:
if (file->dirname) {
pathjoin(fnamecmpbuf, MAXPATHLEN,
file->dirname, xname);
fnamecmp = fnamecmpbuf;
} else
fnamecmp = xname;
break;
default:
if (fnamecmp_type >= basis_dir_cnt) {
rprintf(FERROR,
"invalid basis_dir index: %d.\n",
fnamecmp_type);
exit_cleanup(RERR_PROTOCOL);
}
pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
basis_dir[fnamecmp_type], fname);
fnamecmp = fnamecmpbuf;
break;
}
if (!fnamecmp || (daemon_filter_list.head
&& check_filter(&daemon_filter_list, FLOG, fname, 0) < 0)) {
fnamecmp = fname;
fnamecmp_type = FNAMECMP_FNAME;
}
} else {
/* Reminder: --inplace && --partial-dir are never
* enabled at the same time. */
if (inplace && make_backups > 0) {
if (!(fnamecmp = get_backup_name(fname)))
fnamecmp = fname;
else
fnamecmp_type = FNAMECMP_BACKUP;
} else if (partial_dir && partialptr)
fnamecmp = partialptr;
else
fnamecmp = fname;
}
initial_stats = stats;
/*
* Opening/reading/writing files in BackupPC is quite expensive, given the
* compression. Before we open the file and call mkstemp, we peek ahead at
* the delta tokens to see if the file is unchanged. If so, we skip the file
* open, mkstemp and writing. The file is unchanged if the tokens
* are sequential matching block numbers, which are encoded as
* negative integers (ie: -1, -2, -3...), with no literal data
* tokens (which have positive numbers).
*
* If the file has changed, at some point a matching block token
* will be out of order, or we will encounter a literal data token.
* At that point, we stop reading ahead and proceed as normal.
* We pass the number of matching block tokens, and the first
* unexpected token, to receive_data(), so it can process all
* the tokens back (basically playing them back).
*
* Of course, this only applies if the file exists already,
* and protocol_version 30 is required since older protocols
* use MD4 for the full-file digest, not MD5.
*
* First we need to read the sum struct, then start reading the
* tokens.
*/
recv_ok = 0;
if ( protocol_version >= 30 ) {
numMatchTokens = 0;
while ( (nextToken = recv_token(f_in, &nextData)) != 0 ) {
if ( nextToken != -numMatchTokens - 1 ) break;
numMatchTokens++;
}
if ( nextToken == 0 ) {
OFF_T flength = (OFF_T)numMatchTokens * sum.blength;
if ( sum.remainder && numMatchTokens > 0 )
flength -= sum.blength - sum.remainder;
/*
* Likely exact match - read the final file digest and make
* sure the digest and file size match the existing file.
* If so, this call creates the temporary file so the
* attributes can be checked/set, and then renamed as
* before.
*/
read_buf(f_in, file_sum, MD5_DIGEST_LEN);
if ( !bpc_sysCall_checkFileMatch(fnamecmp, fnametmp, file, file_sum, flength) ) {
recv_ok = 1;
if ( log_before_transfer ) {
iflags &= ~ITEM_REPORT_CHANGE;
log_item(FCLIENT, file, &initial_stats, iflags, NULL);
}
}
}
}
if ( !recv_ok ) {
/*
* proceed as normal, remembering to replay the tokens we read ahead above:
* first, numMatchTokens: -1, -2, ..., -numMatchTokens,
* then (nextToken,nextData). After that we go back to reading the
* remaining tokens from f_in.
*/
/* open the file */
fd1 = do_open(fnamecmp, O_RDONLY, 0);
if ( fd1 < 0 && protocol_version >= 30 && always_checksum ) {
/*
* For protocol_version >= 30 and if always_checksum is set, we can use the
* MD5 whole-file digest to check for a potential match via the pool.
* Use that as the basis if the file is there. The generator does
* the same in recv_generator().
*/
if ( S_ISREG(file->mode) && !bpc_sysCall_poolFileCheck(fnamecmp, file) ) {
fd1 = do_open(fnamecmp, O_RDONLY, 0);
}
}
if (fd1 == -1 && protocol_version < 29) {
if (fnamecmp != fname) {
fnamecmp = fname;
fd1 = do_open(fnamecmp, O_RDONLY, 0);
}
if (fd1 == -1 && basis_dir[0]) {
/* pre-29 allowed only one alternate basis */
pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
basis_dir[0], fname);
fnamecmp = fnamecmpbuf;
fd1 = do_open(fnamecmp, O_RDONLY, 0);
}
}
updating_basis_or_equiv = inplace
&& (fnamecmp == fname || fnamecmp_type == FNAMECMP_BACKUP);
if (fd1 == -1) {
st.st_mode = 0;
st.st_size = 0;
} else if (do_fstat(fd1,&st) != 0) {
rsyserr(FERROR_XFER, errno, "fstat %s failed",
full_fname(fnamecmp));
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
bpc_close(fd1);
if (inc_recurse)
send_msg_int(MSG_NO_SEND, ndx);
continue;
}
if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
/* this special handling for directories
* wouldn't be necessary if robust_rename()
* and the underlying robust_unlink could cope
* with directories
*/
rprintf(FERROR_XFER, "recv_files: %s is a directory\n",
full_fname(fnamecmp));
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
bpc_close(fd1);
if (inc_recurse)
send_msg_int(MSG_NO_SEND, ndx);
continue;
}
if (fd1 != -1 && !S_ISREG(st.st_mode)) {
bpc_close(fd1);
fd1 = -1;
}
/* If we're not preserving permissions, change the file-list's
* mode based on the local permissions and some heuristics. */
if (!preserve_perms) {
int exists = fd1 != -1;
#if 0 /* was SUPPORT_ACLS */
const char *dn = file->dirname ? file->dirname : ".";
if (parent_dirname != dn
&& strcmp(parent_dirname, dn) != 0) {
dflt_perms = default_perms_for_dir(dn);
parent_dirname = dn;
}
#endif
file->mode = dest_mode(file->mode, st.st_mode,
dflt_perms, exists);
}
/* We now check to see if we are writing the file "inplace" */
if (inplace) {
fd2 = do_open(fname, O_WRONLY|O_CREAT, 0600);
if (fd2 == -1) {
rsyserr(FERROR_XFER, errno, "open %s failed",
full_fname(fname));
}
} else {
fd2 = open_tmpfile(fnametmp, fname, file);
if (fd2 != -1)
cleanup_set(fnametmp, partialptr, file, fd1, fd2);
}
if (fd2 == -1) {
discard_receive_data(f_in, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
if (fd1 != -1)
bpc_close(fd1);
if (inc_recurse)
send_msg_int(MSG_NO_SEND, ndx);
continue;
}
/* log the transfer */
if (log_before_transfer)
log_item(FCLIENT, file, &initial_stats, iflags, NULL);
else if (!am_server && verbose && do_progress)
rprintf(FINFO, "%s\n", fname);
/* recv file data */
recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
fname, fd2, F_LENGTH(file),
&sum, numMatchTokens, nextToken, nextData, file_sum);
if (fd1 != -1)
bpc_close(fd1);
if (bpc_close(fd2) < 0) {
rsyserr(FERROR, errno, "close failed on %s",
full_fname(fnametmp));
exit_cleanup(RERR_FILEIO);
}
}
log_item(log_code, file, &initial_stats, iflags, NULL);
if ((recv_ok && (!delay_updates || !partialptr)) || inplace) {
if (partialptr == fname)
partialptr = NULL;
if (!finish_transfer(fname, fnametmp, fnamecmp,
partialptr, file, recv_ok, 1))
recv_ok = -1;
else if (fnamecmp == partialptr) {
do_unlink(partialptr);
handle_partial_dir(partialptr, PDIR_DELETE);
}
} else if (keep_partial && partialptr) {
if (!handle_partial_dir(partialptr, PDIR_CREATE)) {
rprintf(FERROR,
"Unable to create partial-dir for %s -- discarding %s.\n",
local_name ? local_name : f_name(file, NULL),
recv_ok ? "completed file" : "partial file");
do_unlink(fnametmp);
recv_ok = -1;
} else if (!finish_transfer(partialptr, fnametmp, fnamecmp, NULL,
file, recv_ok, !partial_dir))
recv_ok = -1;
else if (delay_updates && recv_ok) {
bitbag_set_bit(delayed_bits, ndx);
recv_ok = 2;
} else
partialptr = NULL;
} else
do_unlink(fnametmp);
cleanup_disable();
if (read_batch)
file->flags |= FLAG_FILE_SENT;
switch (recv_ok) {
case 2:
break;
case 1:
if (remove_source_files || inc_recurse
|| (preserve_hard_links && F_IS_HLINKED(file)))
send_msg_int(MSG_SUCCESS, ndx);
break;
case 0: {
enum logcode msgtype = redoing ? FERROR_XFER : FWARNING;
if (msgtype == FERROR_XFER || verbose) {
char *errstr, *redostr, *keptstr;
if (!(keep_partial && partialptr) && !inplace)
keptstr = "discarded";
else if (partial_dir)
keptstr = "put into partial-dir";
else
keptstr = "retained";
if (msgtype == FERROR_XFER) {
errstr = "ERROR";
redostr = "";
} else {
errstr = "WARNING";
redostr = read_batch ? " (may try again)"
: " (will try again)";
}
rprintf(msgtype,
"%s: %s failed verification -- update %s%s.\n",
errstr, local_name ? f_name(file, NULL) : fname,
keptstr, redostr);
}
if (!redoing) {
if (read_batch)
flist_ndx_push(&batch_redo_list, ndx);
send_msg_int(MSG_REDO, ndx);
file->flags |= FLAG_FILE_SENT;
bpc_sysCall_printfileStatus(fname, "retry");
} else if (inc_recurse)
send_msg_int(MSG_NO_SEND, ndx);
bpc_sysCall_printfileStatus(fname, "fail");
break;
}
case -1:
if (inc_recurse)
send_msg_int(MSG_NO_SEND, ndx);
break;
}
}
if (make_backups < 0)
make_backups = -make_backups;
if (phase == 2 && delay_updates) /* for protocol_version < 29 */
handle_delayed_updates(local_name);
if (verbose > 2)
rprintf(FINFO,"recv_files finished\n");
return 0;
}
static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
const char *fname, int fd, OFF_T total_size)
{
static char file_sum1[MAX_DIGEST_LEN];
static char file_sum2[MAX_DIGEST_LEN];
struct map_struct *mapbuf;
struct sum_struct sum;
int32 len, sum_len;
OFF_T offset = 0;
OFF_T offset2;
char *data;
int32 i;
char *map = NULL;
read_sum_head(f_in, &sum);
if (fd_r >= 0 && size_r > 0) {
int32 read_size = MAX(sum.blength * 2, 16*1024);
mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
if (verbose > 2) {
rprintf(FINFO, "recv mapped %s of size %.0f\n",
fname_r, (double)size_r);
}
} else
mapbuf = NULL;
sum_init(checksum_seed);
if (append_mode > 0) {
OFF_T j;
sum.flength = (OFF_T)sum.count * sum.blength;
if (sum.remainder)
sum.flength -= sum.blength - sum.remainder;
if (append_mode == 2) {
for (j = CHUNK_SIZE; j < sum.flength; j += CHUNK_SIZE) {
if (do_progress)
show_progress(offset, total_size);
sum_update(map_ptr(mapbuf, offset, CHUNK_SIZE),
CHUNK_SIZE);
offset = j;
}
if (offset < sum.flength) {
int32 len = (int32)(sum.flength - offset);
if (do_progress)
show_progress(offset, total_size);
sum_update(map_ptr(mapbuf, offset, len), len);
}
}
offset = sum.flength;
if (fd != -1 && (j = do_lseek(fd, offset, SEEK_SET)) != offset) {
rsyserr(FERROR_XFER, errno, "lseek of %s returned %.0f, not %.0f",
full_fname(fname), (double)j, (double)offset);
exit_cleanup(RERR_FILEIO);
}
}
while ((i = recv_token(f_in, &data)) != 0) {
if (do_progress)
show_progress(offset, total_size);
if (i > 0) {
if (verbose > 3) {
rprintf(FINFO,"data recv %d at %.0f\n",
i,(double)offset);
}
stats.literal_data += i;
cleanup_got_literal = 1;
sum_update(data, i);
if (fd != -1 && write_file(fd,data,i) != i)
goto report_write_error;
offset += i;
continue;
}
i = -(i+1);
offset2 = i * (OFF_T)sum.blength;
len = sum.blength;
if (i == (int)sum.count-1 && sum.remainder != 0)
len = sum.remainder;
stats.matched_data += len;
if (verbose > 3) {
rprintf(FINFO,
"chunk[%d] of size %ld at %.0f offset=%.0f\n",
i, (long)len, (double)offset2, (double)offset);
}
if (mapbuf) {
map = map_ptr(mapbuf,offset2,len);
see_token(map, len);
sum_update(map, len);
}
if (updating_basis_or_equiv) {
if (offset == offset2 && fd != -1) {
OFF_T pos;
if (flush_write_file(fd) < 0)
goto report_write_error;
offset += len;
if ((pos = do_lseek(fd, len, SEEK_CUR)) != offset) {
rsyserr(FERROR_XFER, errno,
"lseek of %s returned %.0f, not %.0f",
full_fname(fname),
(double)pos, (double)offset);
exit_cleanup(RERR_FILEIO);
}
continue;
}
}
if (fd != -1 && map && write_file(fd, map, len) != (int)len)
goto report_write_error;
offset += len;
}
if (flush_write_file(fd) < 0)
goto report_write_error;
#ifdef HAVE_FTRUNCATE
if (inplace && fd != -1
&& ftruncate(fd, offset) < 0) {
rsyserr(FERROR_XFER, errno, "ftruncate failed on %s",
full_fname(fname));
}
#endif
if (do_progress)
end_progress(total_size);
if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
report_write_error:
rsyserr(FERROR_XFER, errno, "write failed on %s",
full_fname(fname));
exit_cleanup(RERR_FILEIO);
}
sum_len = sum_end(file_sum1);
if (mapbuf)
unmap_file(mapbuf);
read_buf(f_in, file_sum2, sum_len);
if (verbose > 2)
rprintf(FINFO,"got file_sum\n");
if (fd != -1 && memcmp(file_sum1, file_sum2, sum_len) != 0)
return 0;
return 1;
}
static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
char *fname, int fd, OFF_T total_size)
{
static char file_sum1[MD4_SUM_LENGTH];
static char file_sum2[MD4_SUM_LENGTH];
struct map_struct *mapbuf;
struct sum_struct sum;
int32 len;
OFF_T offset = 0;
OFF_T offset2;
char *data;
int32 i;
char *map = NULL;
read_sum_head(f_in, &sum);
if (fd_r >= 0 && size_r > 0) {
int32 read_size = MAX(sum.blength * 2, 16*1024);
mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
if (verbose > 2) {
rprintf(FINFO, "recv mapped %s of size %.0f\n",
safe_fname(fname_r), (double)size_r);
}
} else
mapbuf = NULL;
sum_init(checksum_seed);
while ((i = recv_token(f_in, &data)) != 0) {
if (do_progress)
show_progress(offset, total_size);
if (i > 0) {
if (verbose > 3) {
rprintf(FINFO,"data recv %d at %.0f\n",
i,(double)offset);
}
stats.literal_data += i;
cleanup_got_literal = 1;
sum_update(data, i);
if (fd != -1 && write_file(fd,data,i) != i)
goto report_write_error;
offset += i;
continue;
}
i = -(i+1);
offset2 = i * (OFF_T)sum.blength;
len = sum.blength;
if (i == (int)sum.count-1 && sum.remainder != 0)
len = sum.remainder;
stats.matched_data += len;
if (verbose > 3) {
rprintf(FINFO,
"chunk[%d] of size %ld at %.0f offset=%.0f\n",
i, (long)len, (double)offset2, (double)offset);
}
if (mapbuf) {
map = map_ptr(mapbuf,offset2,len);
see_token(map, len);
sum_update(map, len);
}
if (inplace) {
if (offset == offset2 && fd != -1) {
if (flush_write_file(fd) < 0)
goto report_write_error;
offset += len;
if (do_lseek(fd, len, SEEK_CUR) != offset) {
rsyserr(FERROR, errno,
"lseek failed on %s",
full_fname(fname));
exit_cleanup(RERR_FILEIO);
}
continue;
}
}
if (fd != -1 && map && write_file(fd, map, len) != (int)len)
goto report_write_error;
offset += len;
}
if (flush_write_file(fd) < 0)
goto report_write_error;
#ifdef HAVE_FTRUNCATE
if (inplace && fd != -1)
ftruncate(fd, offset);
#endif
if (do_progress)
end_progress(total_size);
if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
report_write_error:
rsyserr(FERROR, errno, "write failed on %s",
full_fname(fname));
exit_cleanup(RERR_FILEIO);
}
sum_end(file_sum1);
if (mapbuf)
unmap_file(mapbuf);
read_buf(f_in,file_sum2,MD4_SUM_LENGTH);
if (verbose > 2)
rprintf(FINFO,"got file_sum\n");
if (fd != -1 && memcmp(file_sum1, file_sum2, MD4_SUM_LENGTH) != 0)
return 0;
return 1;
}