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-rw-r--r--sender.c461
1 files changed, 461 insertions, 0 deletions
diff --git a/sender.c b/sender.c
new file mode 100644
index 0000000..3d4f052
--- /dev/null
+++ b/sender.c
@@ -0,0 +1,461 @@
+/*
+ * Routines only used by the sending process.
+ *
+ * Copyright (C) 1996 Andrew Tridgell
+ * Copyright (C) 1996 Paul Mackerras
+ * Copyright (C) 2003-2022 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"
+#include "inums.h"
+
+extern int do_xfers;
+extern int am_server;
+extern int am_daemon;
+extern int local_server;
+extern int inc_recurse;
+extern int log_before_transfer;
+extern int stdout_format_has_i;
+extern int logfile_format_has_i;
+extern int want_xattr_optim;
+extern int csum_length;
+extern int append_mode;
+extern int copy_links;
+extern int io_error;
+extern int flist_eof;
+extern int whole_file;
+extern int allowed_lull;
+extern int copy_devices;
+extern int preserve_xattrs;
+extern int protocol_version;
+extern int remove_source_files;
+extern int updating_basis_file;
+extern int make_backups;
+extern int inplace;
+extern int inplace_partial;
+extern int batch_fd;
+extern int write_batch;
+extern int file_old_total;
+extern BOOL want_progress_now;
+extern struct stats stats;
+extern struct file_list *cur_flist, *first_flist, *dir_flist;
+extern char num_dev_ino_buf[4 + 8 + 8];
+
+BOOL extra_flist_sending_enabled;
+
+/**
+ * @file
+ *
+ * The sender gets checksums from the generator, calculates deltas,
+ * and transmits them to the receiver. The sender process runs on the
+ * machine holding the source files.
+ **/
+
+/**
+ * Receive the checksums for a buffer
+ **/
+static struct sum_struct *receive_sums(int f)
+{
+ struct sum_struct *s = new(struct sum_struct);
+ int lull_mod = protocol_version >= 31 ? 0 : allowed_lull * 5;
+ OFF_T offset = 0;
+ int32 i;
+
+ read_sum_head(f, s);
+
+ s->sums = NULL;
+
+ if (DEBUG_GTE(DELTASUM, 3)) {
+ rprintf(FINFO, "count=%s n=%ld rem=%ld\n",
+ big_num(s->count), (long)s->blength, (long)s->remainder);
+ }
+
+ if (append_mode > 0) {
+ s->flength = (OFF_T)s->count * s->blength;
+ if (s->remainder)
+ s->flength -= s->blength - s->remainder;
+ return s;
+ }
+
+ if (s->count == 0)
+ return(s);
+
+ s->sums = new_array(struct sum_buf, s->count);
+
+ for (i = 0; i < s->count; i++) {
+ s->sums[i].sum1 = read_int(f);
+ read_buf(f, s->sums[i].sum2, s->s2length);
+
+ s->sums[i].offset = offset;
+ s->sums[i].flags = 0;
+
+ if (i == s->count-1 && s->remainder != 0)
+ s->sums[i].len = s->remainder;
+ else
+ s->sums[i].len = s->blength;
+ offset += s->sums[i].len;
+
+ if (lull_mod && !(i % lull_mod))
+ maybe_send_keepalive(time(NULL), True);
+
+ if (DEBUG_GTE(DELTASUM, 3)) {
+ rprintf(FINFO,
+ "chunk[%d] len=%d offset=%s sum1=%08x\n",
+ i, s->sums[i].len, big_num(s->sums[i].offset),
+ s->sums[i].sum1);
+ }
+ }
+
+ s->flength = offset;
+
+ return s;
+}
+
+void successful_send(int ndx)
+{
+ char fname[MAXPATHLEN];
+ char *failed_op;
+ struct file_struct *file;
+ struct file_list *flist;
+ STRUCT_STAT st;
+
+ if (!remove_source_files)
+ return;
+
+ flist = flist_for_ndx(ndx, "successful_send");
+ file = flist->files[ndx - flist->ndx_start];
+ if (!change_pathname(file, NULL, 0))
+ return;
+ f_name(file, fname);
+
+ if ((copy_links ? do_stat(fname, &st) : do_lstat(fname, &st)) < 0) {
+ failed_op = "re-lstat";
+ goto failed;
+ }
+
+ if (local_server
+ && (int64)st.st_dev == IVAL64(num_dev_ino_buf, 4)
+ && (int64)st.st_ino == IVAL64(num_dev_ino_buf, 4 + 8)) {
+ rprintf(FERROR_XFER, "ERROR: Skipping sender remove of destination file: %s\n", fname);
+ return;
+ }
+
+ if (st.st_size != F_LENGTH(file) || st.st_mtime != file->modtime
+#ifdef ST_MTIME_NSEC
+ || (NSEC_BUMP(file) && (uint32)st.ST_MTIME_NSEC != F_MOD_NSEC(file))
+#endif
+ ) {
+ rprintf(FERROR_XFER, "ERROR: Skipping sender remove for changed file: %s\n", fname);
+ return;
+ }
+
+ if (do_unlink(fname) < 0) {
+ failed_op = "remove";
+ failed:
+ if (errno == ENOENT)
+ rprintf(FINFO, "sender file already removed: %s\n", fname);
+ else
+ rsyserr(FERROR_XFER, errno, "sender failed to %s %s", failed_op, fname);
+ } else {
+ if (INFO_GTE(REMOVE, 1))
+ rprintf(FINFO, "sender removed %s\n", fname);
+ }
+}
+
+static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
+ const char *fname, struct file_struct *file,
+ uchar fnamecmp_type, char *buf, int len)
+{
+ write_ndx(f_out, ndx);
+ if (protocol_version < 29)
+ return;
+ write_shortint(f_out, iflags);
+ if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
+ write_byte(f_out, fnamecmp_type);
+ if (iflags & ITEM_XNAME_FOLLOWS)
+ write_vstring(f_out, buf, len);
+#ifdef SUPPORT_XATTRS
+ if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+ && !(want_xattr_optim && BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
+ send_xattr_request(fname, file, f_out);
+#endif
+}
+
+void send_files(int f_in, int f_out)
+{
+ int fd = -1;
+ struct sum_struct *s;
+ struct map_struct *mbuf = NULL;
+ STRUCT_STAT st;
+ char fname[MAXPATHLEN], xname[MAXPATHLEN];
+ const char *path, *slash;
+ uchar fnamecmp_type;
+ int iflags, xlen;
+ struct file_struct *file;
+ int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
+ int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
+ enum logcode log_code = log_before_transfer ? FLOG : FINFO;
+ int f_xfer = write_batch < 0 ? batch_fd : f_out;
+ int save_io_error = io_error;
+ int ndx, j;
+
+ if (DEBUG_GTE(SEND, 1))
+ rprintf(FINFO, "send_files starting\n");
+
+ if (whole_file < 0)
+ whole_file = 0;
+
+ progress_init();
+
+ while (1) {
+ if (inc_recurse) {
+ send_extra_file_list(f_out, MIN_FILECNT_LOOKAHEAD);
+ extra_flist_sending_enabled = !flist_eof;
+ }
+
+ /* This call also sets cur_flist. */
+ ndx = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type,
+ xname, &xlen);
+ extra_flist_sending_enabled = False;
+
+ if (ndx == NDX_DONE) {
+ if (!am_server && cur_flist) {
+ set_current_file_index(NULL, 0);
+ if (INFO_GTE(PROGRESS, 2))
+ end_progress(0);
+ }
+ if (inc_recurse && first_flist) {
+ file_old_total -= first_flist->used;
+ flist_free(first_flist);
+ if (first_flist) {
+ if (first_flist == cur_flist)
+ file_old_total = cur_flist->used;
+ write_ndx(f_out, NDX_DONE);
+ continue;
+ }
+ }
+ if (++phase > max_phase)
+ break;
+ if (DEBUG_GTE(SEND, 1))
+ rprintf(FINFO, "send_files phase=%d\n", phase);
+ write_ndx(f_out, NDX_DONE);
+ continue;
+ }
+
+ if (inc_recurse)
+ send_extra_file_list(f_out, MIN_FILECNT_LOOKAHEAD);
+
+ 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];
+ if (F_PATHNAME(file)) {
+ path = F_PATHNAME(file);
+ slash = "/";
+ } else {
+ path = slash = "";
+ }
+ if (!change_pathname(file, NULL, 0))
+ continue;
+ f_name(file, fname);
+
+ if (DEBUG_GTE(SEND, 1))
+ rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
+
+#ifdef SUPPORT_XATTRS
+ if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+ && !(want_xattr_optim && BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
+ recv_xattr_request(file, f_in);
+#endif
+
+ if (!(iflags & ITEM_TRANSFER)) {
+ maybe_log_item(file, iflags, itemizing, xname);
+ write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
+ if (iflags & ITEM_IS_NEW) {
+ stats.created_files++;
+ if (S_ISREG(file->mode)) {
+ /* Nothing further to count. */
+ } else if (S_ISDIR(file->mode))
+ stats.created_dirs++;
+#ifdef SUPPORT_LINKS
+ else if (S_ISLNK(file->mode))
+ stats.created_symlinks++;
+#endif
+ else if (IS_DEVICE(file->mode))
+ stats.created_devices++;
+ else
+ stats.created_specials++;
+ }
+ 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) {
+ /* For inplace: redo phase turns off the backup
+ * flag so that we do a regular inplace send. */
+ make_backups = -make_backups;
+ append_mode = -append_mode;
+ csum_length = SUM_LENGTH;
+ }
+ } else {
+ if (csum_length != SHORT_SUM_LENGTH) {
+ make_backups = -make_backups;
+ append_mode = -append_mode;
+ csum_length = SHORT_SUM_LENGTH;
+ }
+ if (iflags & ITEM_IS_NEW)
+ stats.created_files++;
+ }
+
+ updating_basis_file = (inplace_partial && fnamecmp_type == FNAMECMP_PARTIAL_DIR)
+ || (inplace && (protocol_version >= 29 ? fnamecmp_type == FNAMECMP_FNAME : make_backups <= 0));
+
+ if (!am_server)
+ set_current_file_index(file, ndx);
+ stats.xferred_files++;
+ stats.total_transferred_size += F_LENGTH(file);
+
+ remember_initial_stats();
+
+ if (!do_xfers) { /* log the transfer */
+ log_item(FCLIENT, file, iflags, NULL);
+ write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
+ continue;
+ }
+
+ if (!(s = receive_sums(f_in))) {
+ io_error |= IOERR_GENERAL;
+ rprintf(FERROR_XFER, "receive_sums failed\n");
+ exit_cleanup(RERR_PROTOCOL);
+ }
+
+ fd = do_open(fname, O_RDONLY, 0);
+ if (fd == -1) {
+ if (errno == ENOENT) {
+ enum logcode c = am_daemon && protocol_version < 28 ? FERROR : FWARNING;
+ io_error |= IOERR_VANISHED;
+ rprintf(c, "file has vanished: %s\n",
+ full_fname(fname));
+ } else {
+ io_error |= IOERR_GENERAL;
+ rsyserr(FERROR_XFER, errno,
+ "send_files failed to open %s",
+ full_fname(fname));
+ }
+ free_sums(s);
+ if (protocol_version >= 30)
+ send_msg_int(MSG_NO_SEND, ndx);
+ continue;
+ }
+
+ /* map the local file */
+ if (do_fstat(fd, &st) != 0) {
+ io_error |= IOERR_GENERAL;
+ rsyserr(FERROR_XFER, errno, "fstat failed");
+ free_sums(s);
+ close(fd);
+ exit_cleanup(RERR_FILEIO);
+ }
+
+ if (IS_DEVICE(st.st_mode)) {
+ if (!copy_devices) {
+ rprintf(FERROR, "attempt to copy device contents without --copy-devices\n");
+ exit_cleanup(RERR_PROTOCOL);
+ }
+ if (st.st_size == 0)
+ st.st_size = get_device_size(fd, fname);
+ }
+
+ if (append_mode > 0 && st.st_size < F_LENGTH(file)) {
+ rprintf(FWARNING, "skipped diminished file: %s\n",
+ full_fname(fname));
+ free_sums(s);
+ close(fd);
+ if (protocol_version >= 30)
+ send_msg_int(MSG_NO_SEND, ndx);
+ continue;
+ }
+
+ if (st.st_size) {
+ int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
+ mbuf = map_file(fd, st.st_size, read_size, s->blength);
+ } else
+ mbuf = NULL;
+
+ if (DEBUG_GTE(DELTASUM, 2)) {
+ rprintf(FINFO, "send_files mapped %s%s%s of size %s\n",
+ path,slash,fname, big_num(st.st_size));
+ }
+
+ write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
+ write_sum_head(f_xfer, s);
+
+ if (DEBUG_GTE(DELTASUM, 2))
+ rprintf(FINFO, "calling match_sums %s%s%s\n", path,slash,fname);
+
+ if (log_before_transfer)
+ log_item(FCLIENT, file, iflags, NULL);
+ else if (!am_server && INFO_GTE(NAME, 1) && INFO_EQ(PROGRESS, 1))
+ rprintf(FCLIENT, "%s\n", fname);
+
+ set_compression(fname);
+
+ match_sums(f_xfer, s, mbuf, st.st_size);
+ if (INFO_GTE(PROGRESS, 1))
+ end_progress(st.st_size);
+ else if (want_progress_now)
+ instant_progress(fname);
+
+ log_item(log_code, file, iflags, NULL);
+
+ if (mbuf) {
+ j = unmap_file(mbuf);
+ if (j) {
+ io_error |= IOERR_GENERAL;
+ rsyserr(FERROR_XFER, j,
+ "read errors mapping %s",
+ full_fname(fname));
+ }
+ }
+ close(fd);
+
+ free_sums(s);
+
+ if (DEBUG_GTE(SEND, 1))
+ rprintf(FINFO, "sender finished %s%s%s\n", path,slash,fname);
+
+ /* Flag that we actually sent this entry. */
+ file->flags |= FLAG_FILE_SENT;
+ }
+ if (make_backups < 0)
+ make_backups = -make_backups;
+
+ if (io_error != save_io_error && protocol_version >= 30)
+ send_msg_int(MSG_IO_ERROR, io_error);
+
+ if (DEBUG_GTE(SEND, 1))
+ rprintf(FINFO, "send files finished\n");
+
+ match_report();
+
+ write_ndx(f_out, NDX_DONE);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 15:54:41 +0000