sender.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include "rsync.h"
  21
  22 extern int verbose;
  23 extern int do_xfers;
  24 extern int am_server;
  25 extern int am_daemon;
  26 extern int log_before_transfer;
  27 extern int log_format_has_i;
  28 extern int daemon_log_format_has_i;
  29 extern int csum_length;
  30 extern int io_error;
  31 extern int protocol_version;
  32 extern int remove_sent_files;
  33 extern int updating_basis_file;
  34 extern int make_backups;
  35 extern int do_progress;
  36 extern int inplace;
  37 extern int batch_fd;
  38 extern int write_batch;
  39 extern struct stats stats;
  40 extern struct file_list *the_file_list;
  41 extern char *log_format;
  42
  43
  44 /**
  45  * @file
  46  *
  47  * The sender gets checksums from the generator, calculates deltas,
  48  * and transmits them to the receiver.  The sender process runs on the
  49  * machine holding the source files.
  50  **/
  51
  52 /**
  53  * Receive the checksums for a buffer
  54  **/
  55 static struct sum_struct *receive_sums(int f)
  56 {
  57         struct sum_struct *s;
  58         int32 i;
  59         OFF_T offset = 0;
  60
  61         if (!(s = new(struct sum_struct)))
  62                 out_of_memory("receive_sums");
  63
  64         read_sum_head(f, s);
  65
  66         s->sums = NULL;
  67
  68         if (verbose > 3) {
  69                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  70                         (double)s->count, (long)s->blength, (long)s->remainder);
  71         }
  72
  73         if (s->count == 0)
  74                 return(s);
  75
  76         if (!(s->sums = new_array(struct sum_buf, s->count)))
  77                 out_of_memory("receive_sums");
  78
  79         for (i = 0; i < s->count; i++) {
  80                 s->sums[i].sum1 = read_int(f);
  81                 read_buf(f, s->sums[i].sum2, s->s2length);
  82
  83                 s->sums[i].offset = offset;
  84                 s->sums[i].flags = 0;
  85
  86                 if (i == s->count-1 && s->remainder != 0)
  87                         s->sums[i].len = s->remainder;
  88                 else
  89                         s->sums[i].len = s->blength;
  90                 offset += s->sums[i].len;
  91
  92                 if (verbose > 3) {
  93                         rprintf(FINFO,
  94                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
  95                                 i, s->sums[i].len, (double)s->sums[i].offset,
  96                                 s->sums[i].sum1);
  97                 }
  98         }
  99
 100         s->flength = offset;
 101
 102         return s;
 103 }
 104
 105 void successful_send(int ndx)
 106 {
 107         char fname[MAXPATHLEN];
 108         struct file_struct *file;
 109         unsigned int offset;
 110
 111         if (ndx < 0 || ndx >= the_file_list->count)
 112                 return;
 113
 114         file = the_file_list->files[ndx];
 115         /* The generator might tell us about symlinks we didn't send. */
 116         if (!(file->flags & FLAG_SENT) && !S_ISLNK(file->mode))
 117                 return;
 118         if (file->dir.root) {
 119                 offset = stringjoin(fname, sizeof fname,
 120                                     file->dir.root, "/", NULL);
 121         } else
 122                 offset = 0;
 123         f_name_to(file, fname + offset);
 124         if (remove_sent_files && do_unlink(fname) == 0 && verbose > 1) {
 125                 rprintf(FINFO, "sender removed %s\n",
 126                         safe_fname(fname + offset));
 127         }
 128 }
 129
 130 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 131                                 uchar fnamecmp_type, char *buf, int len)
 132 {
 133         write_int(f_out, ndx);
 134         if (protocol_version < 29)
 135                 return;
 136         write_shortint(f_out, iflags);
 137         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 138                 write_byte(f_out, fnamecmp_type);
 139         if (iflags & ITEM_XNAME_FOLLOWS)
 140                 write_vstring(f_out, buf, len);
 141 }
 142
 143 /* This is also used by receive.c with f_out = -1. */
 144 int read_item_attrs(int f_in, int f_out, int ndx, uchar *type_ptr,
 145                     char *buf, int *len_ptr)
 146 {
 147         int len;
 148         uchar fnamecmp_type = FNAMECMP_FNAME;
 149         int iflags = protocol_version >= 29 ? read_shortint(f_in)
 150                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 151
 152         /* Handle the new keep-alive (no-op) packet. */
 153         if (ndx == the_file_list->count && iflags == ITEM_IS_NEW)
 154                 ;
 155         else if (ndx < 0 || ndx >= the_file_list->count) {
 156                 rprintf(FERROR, "Invalid file index: %d (count=%d) [%s]\n",
 157                         ndx, the_file_list->count, who_am_i());
 158                 exit_cleanup(RERR_PROTOCOL);
 159         } else if (iflags == ITEM_IS_NEW) {
 160                 rprintf(FERROR, "Invalid itemized flag word: %x [%s]\n",
 161                         iflags, who_am_i());
 162                 exit_cleanup(RERR_PROTOCOL);
 163         }
 164
 165         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 166                 fnamecmp_type = read_byte(f_in);
 167         *type_ptr = fnamecmp_type;
 168
 169         if (iflags & ITEM_XNAME_FOLLOWS) {
 170                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 171                         exit_cleanup(RERR_PROTOCOL);
 172         } else {
 173                 *buf = '\0';
 174                 len = -1;
 175         }
 176         *len_ptr = len;
 177
 178         /* Temporary handling of 2.6.4pre3 */
 179         if (iflags & ITEM_DUMMY_BIT && iflags & (ITEM_LOCAL_CHANGE|ITEM_TRANSFER))
 180                 iflags &= ~ITEM_DUMMY_BIT;
 181
 182         if (iflags & ITEM_TRANSFER) {
 183                 if (!S_ISREG(the_file_list->files[ndx]->mode)) {
 184                         rprintf(FERROR,
 185                                 "received request to transfer non-regular file: %d [%s]\n",
 186                                 ndx, who_am_i());
 187                         exit_cleanup(RERR_PROTOCOL);
 188                 }
 189         } else if (f_out >= 0) {
 190                 write_ndx_and_attrs(f_out, ndx, iflags,
 191                                     fnamecmp_type, buf, len);
 192         }
 193
 194         return iflags;
 195 }
 196
 197 void send_files(struct file_list *flist, int f_out, int f_in)
 198 {
 199         int fd = -1;
 200         struct sum_struct *s;
 201         struct map_struct *mbuf = NULL;
 202         STRUCT_STAT st;
 203         char *fname2, fname[MAXPATHLEN];
 204         char xname[MAXPATHLEN];
 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         struct stats initial_stats;
 210         int save_make_backups = make_backups;
 211         int itemizing = am_daemon ? daemon_log_format_has_i
 212                       : !am_server && log_format_has_i;
 213         int f_xfer = write_batch < 0 ? batch_fd : f_out;
 214         int i, j;
 215
 216         if (verbose > 2)
 217                 rprintf(FINFO, "send_files starting\n");
 218
 219         while (1) {
 220                 unsigned int offset;
 221
 222                 i = read_int(f_in);
 223                 if (i == -1) {
 224                         if (++phase > max_phase)
 225                                 break;
 226                         csum_length = SUM_LENGTH;
 227                         if (verbose > 2)
 228                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 229                         write_int(f_out, -1);
 230                         /* For inplace: redo phase turns off the backup
 231                          * flag so that we do a regular inplace send. */
 232                         make_backups = 0;
 233                         continue;
 234                 }
 235
 236                 iflags = read_item_attrs(f_in, f_xfer, i, &fnamecmp_type,
 237                                          xname, &xlen);
 238                 if (iflags == ITEM_IS_NEW) /* no-op packet */
 239                         continue;
 240
 241                 file = flist->files[i];
 242                 if (file->dir.root) {
 243                         /* N.B. We're sure that this fits, so offset is OK. */
 244                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 245                         if (!offset || fname[offset-1] != '/')
 246                                 fname[offset++] = '/';
 247                 } else
 248                         offset = 0;
 249                 fname2 = f_name_to(file, fname + offset);
 250
 251                 if (verbose > 2)
 252                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 253
 254                 if (!(iflags & ITEM_TRANSFER)) {
 255                         maybe_log_item(file, iflags, itemizing, xname);
 256                         continue;
 257                 }
 258                 if (phase == 2) {
 259                         rprintf(FERROR,
 260                                 "got transfer request in phase 2 [%s]\n",
 261                                 who_am_i());
 262                         exit_cleanup(RERR_PROTOCOL);
 263                 }
 264
 265                 updating_basis_file = inplace && (protocol_version >= 29
 266                         ? fnamecmp_type == FNAMECMP_FNAME : !make_backups);
 267
 268                 stats.current_file_index = i;
 269                 stats.num_transferred_files++;
 270                 stats.total_transferred_size += file->length;
 271
 272                 if (!do_xfers) { /* log the transfer */
 273                         if (!am_server && log_format)
 274                                 log_item(file, &stats, iflags, NULL);
 275                         write_ndx_and_attrs(f_xfer, i, iflags, fnamecmp_type,
 276                                             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                         return;
 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                                                              : FINFO;
 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, errno,
 300                                         "send_files failed to open %s",
 301                                         full_fname(fname));
 302                         }
 303                         free_sums(s);
 304                         continue;
 305                 }
 306
 307                 /* map the local file */
 308                 if (do_fstat(fd, &st) != 0) {
 309                         io_error |= IOERR_GENERAL;
 310                         rsyserr(FERROR, errno, "fstat failed");
 311                         free_sums(s);
 312                         close(fd);
 313                         return;
 314                 }
 315
 316                 if (st.st_size) {
 317                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 318                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 319                 } else
 320                         mbuf = NULL;
 321
 322                 if (verbose > 2) {
 323                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 324                                 safe_fname(fname), (double)st.st_size);
 325                 }
 326
 327                 write_ndx_and_attrs(f_xfer, i, iflags, fnamecmp_type,
 328                                     xname, xlen);
 329                 write_sum_head(f_xfer, s);
 330
 331                 if (verbose > 2) {
 332                         rprintf(FINFO, "calling match_sums %s\n",
 333                                 safe_fname(fname));
 334                 }
 335
 336                 if (log_before_transfer)
 337                         log_item(file, &initial_stats, iflags, NULL);
 338                 else if (!am_server && verbose && do_progress)
 339                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 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                 if (!log_before_transfer)
 348                         log_item(file, &initial_stats, iflags, NULL);
 349
 350                 if (mbuf) {
 351                         j = unmap_file(mbuf);
 352                         if (j) {
 353                                 io_error |= IOERR_GENERAL;
 354                                 rsyserr(FERROR, j,
 355                                         "read errors mapping %s",
 356                                         full_fname(fname));
 357                         }
 358                 }
 359                 close(fd);
 360
 361                 free_sums(s);
 362
 363                 if (verbose > 2) {
 364                         rprintf(FINFO, "sender finished %s\n",
 365                                 safe_fname(fname));
 366                 }
 367
 368                 /* Flag that we actually sent this entry. */
 369                 file->flags |= FLAG_SENT;
 370         }
 371         make_backups = save_make_backups;
 372
 373         if (verbose > 2)
 374                 rprintf(FINFO, "send files finished\n");
 375
 376         match_report();
 377
 378         write_int(f_out, -1);
 379 }