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) 2003-2008 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
  24 extern int verbose;
  25 extern int dry_run;
  26 extern int do_xfers;
  27 extern int am_server;
  28 extern int am_daemon;
  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 csum_length;
  34 extern int append_mode;
  35 extern int io_error;
  36 extern int allowed_lull;
  37 extern int preserve_xattrs;
  38 extern int protocol_version;
  39 extern int remove_source_files;
  40 extern int updating_basis_file;
  41 extern int make_backups;
  42 extern int do_progress;
  43 extern int inplace;
  44 extern int batch_fd;
  45 extern int write_batch;
  46 extern struct stats stats;
  47 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  48
  49 /**
  50  * @file
  51  *
  52  * The sender gets checksums from the generator, calculates deltas,
  53  * and transmits them to the receiver.  The sender process runs on the
  54  * machine holding the source files.
  55  **/
  56
  57 /**
  58  * Receive the checksums for a buffer
  59  **/
  60 static struct sum_struct *receive_sums(int f)
  61 {
  62         struct sum_struct *s;
  63         int32 i;
  64         int lull_mod = allowed_lull * 5;
  65         OFF_T offset = 0;
  66
  67         if (!(s = new(struct sum_struct)))
  68                 out_of_memory("receive_sums");
  69
  70         read_sum_head(f, s);
  71
  72         s->sums = NULL;
  73
  74         if (verbose > 3) {
  75                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  76                         (double)s->count, (long)s->blength, (long)s->remainder);
  77         }
  78
  79         if (append_mode > 0) {
  80                 s->flength = (OFF_T)s->count * s->blength;
  81                 if (s->remainder)
  82                         s->flength -= s->blength - s->remainder;
  83                 return s;
  84         }
  85
  86         if (s->count == 0)
  87                 return(s);
  88
  89         if (!(s->sums = new_array(struct sum_buf, s->count)))
  90                 out_of_memory("receive_sums");
  91
  92         for (i = 0; i < s->count; i++) {
  93                 s->sums[i].sum1 = read_int(f);
  94                 read_buf(f, s->sums[i].sum2, s->s2length);
  95
  96                 s->sums[i].offset = offset;
  97                 s->sums[i].flags = 0;
  98
  99                 if (i == s->count-1 && s->remainder != 0)
 100                         s->sums[i].len = s->remainder;
 101                 else
 102                         s->sums[i].len = s->blength;
 103                 offset += s->sums[i].len;
 104
 105                 if (allowed_lull && !(i % lull_mod))
 106                         maybe_send_keepalive();
 107
 108                 if (verbose > 3) {
 109                         rprintf(FINFO,
 110                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
 111                                 i, s->sums[i].len, (double)s->sums[i].offset,
 112                                 s->sums[i].sum1);
 113                 }
 114         }
 115
 116         s->flength = offset;
 117
 118         return s;
 119 }
 120
 121 void successful_send(int ndx)
 122 {
 123         char fname[MAXPATHLEN];
 124         struct file_struct *file;
 125         struct file_list *flist;
 126
 127         if (!remove_source_files)
 128                 return;
 129
 130         if (!(flist = flist_for_ndx(ndx))) {
 131                 rprintf(FERROR,
 132                         "INTERNAL ERROR: unable to find flist for item %d\n",
 133                         ndx);
 134                 return;
 135         }
 136
 137         file = flist->files[ndx - flist->ndx_start];
 138         if (!change_pathname(file, NULL, 0))
 139                 return;
 140         f_name(file, fname);
 141
 142         if (do_unlink(fname) == 0) {
 143                 if (verbose > 1)
 144                         rprintf(FINFO, "sender removed %s\n", fname);
 145         } else
 146                 rsyserr(FERROR, errno, "sender failed to remove %s", fname);
 147 }
 148
 149 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 150                                 const char *fname, struct file_struct *file,
 151                                 uchar fnamecmp_type, char *buf, int len)
 152 {
 153         write_ndx(f_out, ndx);
 154         if (protocol_version < 29)
 155                 return;
 156         write_shortint(f_out, iflags);
 157         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 158                 write_byte(f_out, fnamecmp_type);
 159         if (iflags & ITEM_XNAME_FOLLOWS)
 160                 write_vstring(f_out, buf, len);
 161 #ifdef SUPPORT_XATTRS
 162         if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
 163                 send_xattr_request(fname, file, f_out);
 164 #endif
 165 }
 166
 167 void send_files(int f_in, int f_out)
 168 {
 169         int fd = -1;
 170         struct sum_struct *s;
 171         struct map_struct *mbuf = NULL;
 172         STRUCT_STAT st;
 173         char fname[MAXPATHLEN], xname[MAXPATHLEN];
 174         const char *path, *slash;
 175         uchar fnamecmp_type;
 176         int iflags, xlen;
 177         struct file_struct *file;
 178         int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
 179         struct stats initial_stats;
 180         int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
 181         enum logcode log_code = log_before_transfer ? FLOG : FINFO;
 182         int f_xfer = write_batch < 0 ? batch_fd : f_out;
 183         int ndx, j;
 184
 185         if (verbose > 2)
 186                 rprintf(FINFO, "send_files starting\n");
 187
 188         while (1) {
 189                 if (inc_recurse)
 190                         send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
 191
 192                 /* This call also sets cur_flist. */
 193                 ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
 194                                          xname, &xlen);
 195                 if (ndx == NDX_DONE) {
 196                         if (inc_recurse && first_flist) {
 197                                 flist_free(first_flist);
 198                                 if (first_flist) {
 199                                         write_ndx(f_out, NDX_DONE);
 200                                         continue;
 201                                 }
 202                         }
 203                         if (++phase > max_phase)
 204                                 break;
 205                         if (verbose > 2)
 206                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 207                         write_ndx(f_out, NDX_DONE);
 208                         continue;
 209                 }
 210
 211                 if (inc_recurse)
 212                         send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
 213
 214                 if (ndx - cur_flist->ndx_start >= 0)
 215                         file = cur_flist->files[ndx - cur_flist->ndx_start];
 216                 else
 217                         file = dir_flist->files[cur_flist->parent_ndx];
 218                 if (F_PATHNAME(file)) {
 219                         path = F_PATHNAME(file);
 220                         slash = "/";
 221                 } else {
 222                         path = slash = "";
 223                 }
 224                 if (!change_pathname(file, NULL, 0))
 225                         continue;
 226                 f_name(file, fname);
 227
 228                 if (verbose > 2)
 229                         rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
 230
 231 #ifdef SUPPORT_XATTRS
 232                 if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
 233                         recv_xattr_request(file, f_in);
 234 #endif
 235
 236                 if (!(iflags & ITEM_TRANSFER)) {
 237                         maybe_log_item(file, iflags, itemizing, xname);
 238                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 239                                             fnamecmp_type, xname, xlen);
 240                         continue;
 241                 }
 242                 if (phase == 2) {
 243                         rprintf(FERROR,
 244                                 "got transfer request in phase 2 [%s]\n",
 245                                 who_am_i());
 246                         exit_cleanup(RERR_PROTOCOL);
 247                 }
 248
 249                 if (file->flags & FLAG_FILE_SENT) {
 250                         if (csum_length == SHORT_SUM_LENGTH) {
 251                                 /* For inplace: redo phase turns off the backup
 252                                  * flag so that we do a regular inplace send. */
 253                                 make_backups = -make_backups;
 254                                 append_mode = -append_mode;
 255                                 csum_length = SUM_LENGTH;
 256                         }
 257                 } else {
 258                         if (csum_length != SHORT_SUM_LENGTH) {
 259                                 make_backups = -make_backups;
 260                                 append_mode = -append_mode;
 261                                 csum_length = SHORT_SUM_LENGTH;
 262                         }
 263                 }
 264
 265                 updating_basis_file = inplace && (protocol_version >= 29
 266                         ? fnamecmp_type == FNAMECMP_FNAME : make_backups <= 0);
 267
 268                 if (!am_server && do_progress)
 269                         set_current_file_index(file, ndx);
 270                 stats.num_transferred_files++;
 271                 stats.total_transferred_size += F_LENGTH(file);
 272
 273                 if (!do_xfers) { /* log the transfer */
 274                         log_item(FCLIENT, file, &stats, iflags, NULL);
 275                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 276                                             fnamecmp_type, xname, xlen);
 277                         continue;
 278                 }
 279
 280                 initial_stats = stats;
 281
 282                 if (!(s = receive_sums(f_in))) {
 283                         io_error |= IOERR_GENERAL;
 284                         rprintf(FERROR, "receive_sums failed\n");
 285                         exit_cleanup(RERR_PROTOCOL);
 286                 }
 287
 288                 fd = do_open(fname, O_RDONLY, 0);
 289                 if (fd == -1) {
 290                         if (errno == ENOENT) {
 291                                 enum logcode c = am_daemon
 292                                     && protocol_version < 28 ? FERROR
 293                                                              : FWARNING;
 294                                 io_error |= IOERR_VANISHED;
 295                                 rprintf(c, "file has vanished: %s\n",
 296                                         full_fname(fname));
 297                         } else {
 298                                 io_error |= IOERR_GENERAL;
 299                                 rsyserr(FERROR_XFER, errno,
 300                                         "send_files failed to open %s",
 301                                         full_fname(fname));
 302                         }
 303                         free_sums(s);
 304                         if (protocol_version >= 30)
 305                                 send_msg_int(MSG_NO_SEND, ndx);
 306                         continue;
 307                 }
 308
 309                 /* map the local file */
 310                 if (do_fstat(fd, &st) != 0) {
 311                         io_error |= IOERR_GENERAL;
 312                         rsyserr(FERROR, errno, "fstat failed");
 313                         free_sums(s);
 314                         close(fd);
 315                         exit_cleanup(RERR_PROTOCOL);
 316                 }
 317
 318                 if (st.st_size) {
 319                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 320                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 321                 } else
 322                         mbuf = NULL;
 323
 324                 if (verbose > 2) {
 325                         rprintf(FINFO, "send_files mapped %s%s%s of size %.0f\n",
 326                                 path,slash,fname, (double)st.st_size);
 327                 }
 328
 329                 write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 330                                     fnamecmp_type, xname, xlen);
 331                 write_sum_head(f_xfer, s);
 332
 333                 if (verbose > 2)
 334                         rprintf(FINFO, "calling match_sums %s%s%s\n", path,slash,fname);
 335
 336                 if (log_before_transfer)
 337                         log_item(FCLIENT, file, &initial_stats, iflags, NULL);
 338                 else if (!am_server && verbose && do_progress)
 339                         rprintf(FCLIENT, "%s\n", fname);
 340
 341                 set_compression(fname);
 342
 343                 match_sums(f_xfer, s, mbuf, st.st_size);
 344                 if (do_progress)
 345                         end_progress(st.st_size);
 346
 347                 log_item(log_code, file, &initial_stats, iflags, NULL);
 348
 349                 if (mbuf) {
 350                         j = unmap_file(mbuf);
 351                         if (j) {
 352                                 io_error |= IOERR_GENERAL;
 353                                 rsyserr(FERROR_XFER, j,
 354                                         "read errors mapping %s",
 355                                         full_fname(fname));
 356                         }
 357                 }
 358                 close(fd);
 359
 360                 free_sums(s);
 361
 362                 if (verbose > 2)
 363                         rprintf(FINFO, "sender finished %s%s%s\n", path,slash,fname);
 364
 365                 /* Flag that we actually sent this entry. */
 366                 file->flags |= FLAG_FILE_SENT;
 367         }
 368         if (make_backups < 0)
 369                 make_backups = -make_backups;
 370
 371         if (verbose > 2)
 372                 rprintf(FINFO, "send files finished\n");
 373
 374         match_report();
 375
 376         write_ndx(f_out, NDX_DONE);
 377 }