sender.c

   1 /*
   2  * Routines only used by the sending process.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2003-2022 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  20  */
  21
  22 #include "rsync.h"
  23 #include "inums.h"
  24
  25 extern int do_xfers;
  26 extern int am_server;
  27 extern int am_daemon;
  28 extern int local_server;
  29 extern int inc_recurse;
  30 extern int log_before_transfer;
  31 extern int stdout_format_has_i;
  32 extern int logfile_format_has_i;
  33 extern int want_xattr_optim;
  34 extern int csum_length;
  35 extern int append_mode;
  36 extern int copy_links;
  37 extern int io_error;
  38 extern int flist_eof;
  39 extern int whole_file;
  40 extern int allowed_lull;
  41 extern int copy_devices;
  42 extern int preserve_xattrs;
  43 extern int protocol_version;
  44 extern int remove_source_files;
  45 extern int updating_basis_file;
  46 extern int make_backups;
  47 extern int inplace;
  48 extern int inplace_partial;
  49 extern int batch_fd;
  50 extern int write_batch;
  51 extern int file_old_total;
  52 extern BOOL want_progress_now;
  53 extern struct stats stats;
  54 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  55 extern char num_dev_ino_buf[4 + 8 + 8];
  56
  57 BOOL extra_flist_sending_enabled;
  58
  59 /**
  60  * @file
  61  *
  62  * The sender gets checksums from the generator, calculates deltas,
  63  * and transmits them to the receiver.  The sender process runs on the
  64  * machine holding the source files.
  65  **/
  66
  67 /**
  68  * Receive the checksums for a buffer
  69  **/
  70 static struct sum_struct *receive_sums(int f)
  71 {
  72         struct sum_struct *s = new(struct sum_struct);
  73         int lull_mod = protocol_version >= 31 ? 0 : allowed_lull * 5;
  74         OFF_T offset = 0;
  75         int32 i;
  76
  77         read_sum_head(f, s);
  78
  79         s->sums = NULL;
  80
  81         if (DEBUG_GTE(DELTASUM, 3)) {
  82                 rprintf(FINFO, "count=%s n=%ld rem=%ld\n",
  83                         big_num(s->count), (long)s->blength, (long)s->remainder);
  84         }
  85
  86         if (append_mode > 0) {
  87                 s->flength = (OFF_T)s->count * s->blength;
  88                 if (s->remainder)
  89                         s->flength -= s->blength - s->remainder;
  90                 return s;
  91         }
  92
  93         if (s->count == 0)
  94                 return(s);
  95
  96         s->sums = new_array(struct sum_buf, s->count);
  97
  98         for (i = 0; i < s->count; i++) {
  99                 s->sums[i].sum1 = read_int(f);
 100                 read_buf(f, s->sums[i].sum2, s->s2length);
 101
 102                 s->sums[i].offset = offset;
 103                 s->sums[i].flags = 0;
 104
 105                 if (i == s->count-1 && s->remainder != 0)
 106                         s->sums[i].len = s->remainder;
 107                 else
 108                         s->sums[i].len = s->blength;
 109                 offset += s->sums[i].len;
 110
 111                 if (lull_mod && !(i % lull_mod))
 112                         maybe_send_keepalive(time(NULL), True);
 113
 114                 if (DEBUG_GTE(DELTASUM, 3)) {
 115                         rprintf(FINFO,
 116                                 "chunk[%d] len=%d offset=%s sum1=%08x\n",
 117                                 i, s->sums[i].len, big_num(s->sums[i].offset),
 118                                 s->sums[i].sum1);
 119                 }
 120         }
 121
 122         s->flength = offset;
 123
 124         return s;
 125 }
 126
 127 void successful_send(int ndx)
 128 {
 129         char fname[MAXPATHLEN];
 130         char *failed_op;
 131         struct file_struct *file;
 132         struct file_list *flist;
 133         STRUCT_STAT st;
 134
 135         if (!remove_source_files)
 136                 return;
 137
 138         flist = flist_for_ndx(ndx, "successful_send");
 139         file = flist->files[ndx - flist->ndx_start];
 140         if (!change_pathname(file, NULL, 0))
 141                 return;
 142         f_name(file, fname);
 143
 144         if ((copy_links ? do_stat(fname, &st) : do_lstat(fname, &st)) < 0) {
 145                 failed_op = "re-lstat";
 146                 goto failed;
 147         }
 148
 149         if (local_server
 150          && (int64)st.st_dev == IVAL64(num_dev_ino_buf, 4)
 151          && (int64)st.st_ino == IVAL64(num_dev_ino_buf, 4 + 8)) {
 152                 rprintf(FERROR_XFER, "ERROR: Skipping sender remove of destination file: %s\n", fname);
 153                 return;
 154         }
 155
 156         if (st.st_size != F_LENGTH(file) || st.st_mtime != file->modtime
 157 #ifdef ST_MTIME_NSEC
 158          || (NSEC_BUMP(file) && (uint32)st.ST_MTIME_NSEC != F_MOD_NSEC(file))
 159 #endif
 160         ) {
 161                 rprintf(FERROR_XFER, "ERROR: Skipping sender remove for changed file: %s\n", fname);
 162                 return;
 163         }
 164
 165         if (do_unlink(fname) < 0) {
 166                 failed_op = "remove";
 167           failed:
 168                 if (errno == ENOENT)
 169                         rprintf(FINFO, "sender file already removed: %s\n", fname);
 170                 else
 171                         rsyserr(FERROR_XFER, errno, "sender failed to %s %s", failed_op, fname);
 172         } else {
 173                 if (INFO_GTE(REMOVE, 1))
 174                         rprintf(FINFO, "sender removed %s\n", fname);
 175         }
 176 }
 177
 178 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 179                                 const char *fname, struct file_struct *file,
 180                                 uchar fnamecmp_type, char *buf, int len)
 181 {
 182         write_ndx(f_out, ndx);
 183         if (protocol_version < 29)
 184                 return;
 185         write_shortint(f_out, iflags);
 186         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 187                 write_byte(f_out, fnamecmp_type);
 188         if (iflags & ITEM_XNAME_FOLLOWS)
 189                 write_vstring(f_out, buf, len);
 190 #ifdef SUPPORT_XATTRS
 191         if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
 192          && !(want_xattr_optim && BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
 193                 send_xattr_request(fname, file, f_out);
 194 #endif
 195 }
 196
 197 void send_files(int f_in, int f_out)
 198 {
 199         int fd = -1;
 200         struct sum_struct *s;
 201         struct map_struct *mbuf = NULL;
 202         STRUCT_STAT st;
 203         char fname[MAXPATHLEN], xname[MAXPATHLEN];
 204         const char *path, *slash;
 205         uchar fnamecmp_type;
 206         int iflags, xlen;
 207         struct file_struct *file;
 208         int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
 209         int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
 210         enum logcode log_code = log_before_transfer ? FLOG : FINFO;
 211         int f_xfer = write_batch < 0 ? batch_fd : f_out;
 212         int save_io_error = io_error;
 213         int ndx, j;
 214
 215         if (DEBUG_GTE(SEND, 1))
 216                 rprintf(FINFO, "send_files starting\n");
 217
 218         if (whole_file < 0)
 219                 whole_file = 0;
 220
 221         progress_init();
 222
 223         while (1) {
 224                 if (inc_recurse) {
 225                         send_extra_file_list(f_out, MIN_FILECNT_LOOKAHEAD);
 226                         extra_flist_sending_enabled = !flist_eof;
 227                 }
 228
 229                 /* This call also sets cur_flist. */
 230                 ndx = read_ndx_and_attrs(f_in, f_out, &iflags, &fnamecmp_type,
 231                                          xname, &xlen);
 232                 extra_flist_sending_enabled = False;
 233
 234                 if (ndx == NDX_DONE) {
 235                         if (!am_server && cur_flist) {
 236                                 set_current_file_index(NULL, 0);
 237                                 if (INFO_GTE(PROGRESS, 2))
 238                                         end_progress(0);
 239                         }
 240                         if (inc_recurse && first_flist) {
 241                                 file_old_total -= first_flist->used;
 242                                 flist_free(first_flist);
 243                                 if (first_flist) {
 244                                         if (first_flist == cur_flist)
 245                                                 file_old_total = cur_flist->used;
 246                                         write_ndx(f_out, NDX_DONE);
 247                                         continue;
 248                                 }
 249                         }
 250                         if (++phase > max_phase)
 251                                 break;
 252                         if (DEBUG_GTE(SEND, 1))
 253                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 254                         write_ndx(f_out, NDX_DONE);
 255                         continue;
 256                 }
 257
 258                 if (inc_recurse)
 259                         send_extra_file_list(f_out, MIN_FILECNT_LOOKAHEAD);
 260
 261                 if (ndx - cur_flist->ndx_start >= 0)
 262                         file = cur_flist->files[ndx - cur_flist->ndx_start];
 263                 else
 264                         file = dir_flist->files[cur_flist->parent_ndx];
 265                 if (F_PATHNAME(file)) {
 266                         path = F_PATHNAME(file);
 267                         slash = "/";
 268                 } else {
 269                         path = slash = "";
 270                 }
 271                 if (!change_pathname(file, NULL, 0))
 272                         continue;
 273                 f_name(file, fname);
 274
 275                 if (DEBUG_GTE(SEND, 1))
 276                         rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
 277
 278 #ifdef SUPPORT_XATTRS
 279                 if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
 280                  && !(want_xattr_optim && BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
 281                         recv_xattr_request(file, f_in);
 282 #endif
 283
 284                 if (!(iflags & ITEM_TRANSFER)) {
 285                         maybe_log_item(file, iflags, itemizing, xname);
 286                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
 287                         if (iflags & ITEM_IS_NEW) {
 288                                 stats.created_files++;
 289                                 if (S_ISREG(file->mode)) {
 290                                         /* Nothing further to count. */
 291                                 } else if (S_ISDIR(file->mode))
 292                                         stats.created_dirs++;
 293 #ifdef SUPPORT_LINKS
 294                                 else if (S_ISLNK(file->mode))
 295                                         stats.created_symlinks++;
 296 #endif
 297                                 else if (IS_DEVICE(file->mode))
 298                                         stats.created_devices++;
 299                                 else
 300                                         stats.created_specials++;
 301                         }
 302                         continue;
 303                 }
 304                 if (phase == 2) {
 305                         rprintf(FERROR,
 306                                 "got transfer request in phase 2 [%s]\n",
 307                                 who_am_i());
 308                         exit_cleanup(RERR_PROTOCOL);
 309                 }
 310
 311                 if (file->flags & FLAG_FILE_SENT) {
 312                         if (csum_length == SHORT_SUM_LENGTH) {
 313                                 /* For inplace: redo phase turns off the backup
 314                                  * flag so that we do a regular inplace send. */
 315                                 make_backups = -make_backups;
 316                                 append_mode = -append_mode;
 317                                 csum_length = SUM_LENGTH;
 318                         }
 319                 } else {
 320                         if (csum_length != SHORT_SUM_LENGTH) {
 321                                 make_backups = -make_backups;
 322                                 append_mode = -append_mode;
 323                                 csum_length = SHORT_SUM_LENGTH;
 324                         }
 325                         if (iflags & ITEM_IS_NEW)
 326                                 stats.created_files++;
 327                 }
 328
 329                 updating_basis_file = (inplace_partial && fnamecmp_type == FNAMECMP_PARTIAL_DIR)
 330                     || (inplace && (protocol_version >= 29 ? fnamecmp_type == FNAMECMP_FNAME : make_backups <= 0));
 331
 332                 if (!am_server)
 333                         set_current_file_index(file, ndx);
 334                 stats.xferred_files++;
 335                 stats.total_transferred_size += F_LENGTH(file);
 336
 337                 remember_initial_stats();
 338
 339                 if (!do_xfers) { /* log the transfer */
 340                         log_item(FCLIENT, file, iflags, NULL);
 341                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
 342                         continue;
 343                 }
 344
 345                 if (!(s = receive_sums(f_in))) {
 346                         io_error |= IOERR_GENERAL;
 347                         rprintf(FERROR_XFER, "receive_sums failed\n");
 348                         exit_cleanup(RERR_PROTOCOL);
 349                 }
 350
 351                 fd = do_open(fname, O_RDONLY, 0);
 352                 if (fd == -1) {
 353                         if (errno == ENOENT) {
 354                                 enum logcode c = am_daemon && protocol_version < 28 ? FERROR : FWARNING;
 355                                 io_error |= IOERR_VANISHED;
 356                                 rprintf(c, "file has vanished: %s\n",
 357                                         full_fname(fname));
 358                         } else {
 359                                 io_error |= IOERR_GENERAL;
 360                                 rsyserr(FERROR_XFER, errno,
 361                                         "send_files failed to open %s",
 362                                         full_fname(fname));
 363                         }
 364                         free_sums(s);
 365                         if (protocol_version >= 30)
 366                                 send_msg_int(MSG_NO_SEND, ndx);
 367                         continue;
 368                 }
 369
 370                 /* map the local file */
 371                 if (do_fstat(fd, &st) != 0) {
 372                         io_error |= IOERR_GENERAL;
 373                         rsyserr(FERROR_XFER, errno, "fstat failed");
 374                         free_sums(s);
 375                         close(fd);
 376                         exit_cleanup(RERR_FILEIO);
 377                 }
 378
 379                 if (IS_DEVICE(st.st_mode)) {
 380                         if (!copy_devices) {
 381                                 rprintf(FERROR, "attempt to copy device contents without --copy-devices\n");
 382                                 exit_cleanup(RERR_PROTOCOL);
 383                         }
 384                         if (st.st_size == 0)
 385                                 st.st_size = get_device_size(fd, fname);
 386                 }
 387
 388                 if (append_mode > 0 && st.st_size < F_LENGTH(file)) {
 389                         rprintf(FWARNING, "skipped diminished file: %s\n",
 390                                 full_fname(fname));
 391                         free_sums(s);
 392                         close(fd);
 393                         if (protocol_version >= 30)
 394                                 send_msg_int(MSG_NO_SEND, ndx);
 395                         continue;
 396                 }
 397
 398                 if (st.st_size) {
 399                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 400                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 401                 } else
 402                         mbuf = NULL;
 403
 404                 if (DEBUG_GTE(DELTASUM, 2)) {
 405                         rprintf(FINFO, "send_files mapped %s%s%s of size %s\n",
 406                                 path,slash,fname, big_num(st.st_size));
 407                 }
 408
 409                 write_ndx_and_attrs(f_out, ndx, iflags, fname, file, fnamecmp_type, xname, xlen);
 410                 write_sum_head(f_xfer, s);
 411
 412                 if (DEBUG_GTE(DELTASUM, 2))
 413                         rprintf(FINFO, "calling match_sums %s%s%s\n", path,slash,fname);
 414
 415                 if (log_before_transfer)
 416                         log_item(FCLIENT, file, iflags, NULL);
 417                 else if (!am_server && INFO_GTE(NAME, 1) && INFO_EQ(PROGRESS, 1))
 418                         rprintf(FCLIENT, "%s\n", fname);
 419
 420                 set_compression(fname);
 421
 422                 match_sums(f_xfer, s, mbuf, st.st_size);
 423                 if (INFO_GTE(PROGRESS, 1))
 424                         end_progress(st.st_size);
 425                 else if (want_progress_now)
 426                         instant_progress(fname);
 427
 428                 log_item(log_code, file, iflags, NULL);
 429
 430                 if (mbuf) {
 431                         j = unmap_file(mbuf);
 432                         if (j) {
 433                                 io_error |= IOERR_GENERAL;
 434                                 rsyserr(FERROR_XFER, j,
 435                                         "read errors mapping %s",
 436                                         full_fname(fname));
 437                         }
 438                 }
 439                 close(fd);
 440
 441                 free_sums(s);
 442
 443                 if (DEBUG_GTE(SEND, 1))
 444                         rprintf(FINFO, "sender finished %s%s%s\n", path,slash,fname);
 445
 446                 /* Flag that we actually sent this entry. */
 447                 file->flags |= FLAG_FILE_SENT;
 448         }
 449         if (make_backups < 0)
 450                 make_backups = -make_backups;
 451
 452         if (io_error != save_io_error && protocol_version >= 30)
 453                 send_msg_int(MSG_IO_ERROR, io_error);
 454
 455         if (DEBUG_GTE(SEND, 1))
 456                 rprintf(FINFO, "send files finished\n");
 457
 458         match_report();
 459
 460         write_ndx(f_out, NDX_DONE);
 461 }