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 allowed_lull;
  32 extern int protocol_version;
  33 extern int remove_sent_files;
  34 extern int updating_basis_file;
  35 extern int make_backups;
  36 extern int do_progress;
  37 extern int inplace;
  38 extern int batch_fd;
  39 extern int write_batch;
  40 extern struct stats stats;
  41 extern struct file_list *the_file_list;
  42 extern char *log_format;
  43
  44
  45 /**
  46  * @file
  47  *
  48  * The sender gets checksums from the generator, calculates deltas,
  49  * and transmits them to the receiver.  The sender process runs on the
  50  * machine holding the source files.
  51  **/
  52
  53 /**
  54  * Receive the checksums for a buffer
  55  **/
  56 static struct sum_struct *receive_sums(int f)
  57 {
  58         struct sum_struct *s;
  59         int32 i;
  60         int lull_mod = allowed_lull * 5;
  61         OFF_T offset = 0;
  62
  63         if (!(s = new(struct sum_struct)))
  64                 out_of_memory("receive_sums");
  65
  66         read_sum_head(f, s);
  67
  68         s->sums = NULL;
  69
  70         if (verbose > 3) {
  71                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  72                         (double)s->count, (long)s->blength, (long)s->remainder);
  73         }
  74
  75         if (s->count == 0)
  76                 return(s);
  77
  78         if (!(s->sums = new_array(struct sum_buf, s->count)))
  79                 out_of_memory("receive_sums");
  80
  81         for (i = 0; i < s->count; i++) {
  82                 s->sums[i].sum1 = read_int(f);
  83                 read_buf(f, s->sums[i].sum2, s->s2length);
  84
  85                 s->sums[i].offset = offset;
  86                 s->sums[i].flags = 0;
  87
  88                 if (i == s->count-1 && s->remainder != 0)
  89                         s->sums[i].len = s->remainder;
  90                 else
  91                         s->sums[i].len = s->blength;
  92                 offset += s->sums[i].len;
  93
  94                 if (allowed_lull && !(i % lull_mod))
  95                         maybe_send_keepalive();
  96
  97                 if (verbose > 3) {
  98                         rprintf(FINFO,
  99                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
 100                                 i, s->sums[i].len, (double)s->sums[i].offset,
 101                                 s->sums[i].sum1);
 102                 }
 103         }
 104
 105         s->flength = offset;
 106
 107         return s;
 108 }
 109
 110 void successful_send(int ndx)
 111 {
 112         char fname[MAXPATHLEN];
 113         struct file_struct *file;
 114         unsigned int offset;
 115
 116         if (ndx < 0 || ndx >= the_file_list->count)
 117                 return;
 118
 119         file = the_file_list->files[ndx];
 120         /* The generator might tell us about symlinks we didn't send. */
 121         if (!(file->flags & FLAG_SENT) && !S_ISLNK(file->mode))
 122                 return;
 123         if (file->dir.root) {
 124                 offset = stringjoin(fname, sizeof fname,
 125                                     file->dir.root, "/", NULL);
 126         } else
 127                 offset = 0;
 128         f_name_to(file, fname + offset);
 129         if (remove_sent_files && do_unlink(fname) == 0 && verbose > 1) {
 130                 rprintf(FINFO, "sender removed %s\n",
 131                         safe_fname(fname + offset));
 132         }
 133 }
 134
 135 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 136                                 uchar fnamecmp_type, char *buf, int len)
 137 {
 138         write_int(f_out, ndx);
 139         if (protocol_version < 29)
 140                 return;
 141         write_shortint(f_out, iflags);
 142         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 143                 write_byte(f_out, fnamecmp_type);
 144         if (iflags & ITEM_XNAME_FOLLOWS)
 145                 write_vstring(f_out, buf, len);
 146 }
 147
 148 /* This is also used by receive.c with f_out = -1. */
 149 int read_item_attrs(int f_in, int f_out, int ndx, uchar *type_ptr,
 150                     char *buf, int *len_ptr)
 151 {
 152         int len;
 153         uchar fnamecmp_type = FNAMECMP_FNAME;
 154         int iflags = protocol_version >= 29 ? read_shortint(f_in)
 155                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 156
 157         /* Handle the new keep-alive (no-op) packet. */
 158         if (ndx == the_file_list->count && iflags == ITEM_IS_NEW)
 159                 ;
 160         else if (ndx < 0 || ndx >= the_file_list->count) {
 161                 rprintf(FERROR, "Invalid file index: %d (count=%d) [%s]\n",
 162                         ndx, the_file_list->count, who_am_i());
 163                 exit_cleanup(RERR_PROTOCOL);
 164         } else if (iflags == ITEM_IS_NEW) {
 165                 rprintf(FERROR, "Invalid itemized flag word: %x [%s]\n",
 166                         iflags, who_am_i());
 167                 exit_cleanup(RERR_PROTOCOL);
 168         }
 169
 170         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 171                 fnamecmp_type = read_byte(f_in);
 172         *type_ptr = fnamecmp_type;
 173
 174         if (iflags & ITEM_XNAME_FOLLOWS) {
 175                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 176                         exit_cleanup(RERR_PROTOCOL);
 177         } else {
 178                 *buf = '\0';
 179                 len = -1;
 180         }
 181         *len_ptr = len;
 182
 183         if (iflags & ITEM_TRANSFER) {
 184                 if (!S_ISREG(the_file_list->files[ndx]->mode)) {
 185                         rprintf(FERROR,
 186                                 "received request to transfer non-regular file: %d [%s]\n",
 187                                 ndx, who_am_i());
 188                         exit_cleanup(RERR_PROTOCOL);
 189                 }
 190         } else if (f_out >= 0) {
 191                 write_ndx_and_attrs(f_out, ndx, iflags,
 192                                     fnamecmp_type, buf, len);
 193         }
 194
 195         return iflags;
 196 }
 197
 198 void send_files(struct file_list *flist, int f_out, int f_in)
 199 {
 200         int fd = -1;
 201         struct sum_struct *s;
 202         struct map_struct *mbuf = NULL;
 203         STRUCT_STAT st;
 204         char *fname2, fname[MAXPATHLEN];
 205         char xname[MAXPATHLEN];
 206         uchar fnamecmp_type;
 207         int iflags, xlen;
 208         struct file_struct *file;
 209         int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
 210         struct stats initial_stats;
 211         int save_make_backups = make_backups;
 212         int itemizing = am_daemon ? daemon_log_format_has_i
 213                       : !am_server && log_format_has_i;
 214         int f_xfer = write_batch < 0 ? batch_fd : f_out;
 215         int i, j;
 216
 217         if (verbose > 2)
 218                 rprintf(FINFO, "send_files starting\n");
 219
 220         while (1) {
 221                 unsigned int offset;
 222
 223                 i = read_int(f_in);
 224                 if (i == -1) {
 225                         if (++phase > max_phase)
 226                                 break;
 227                         csum_length = SUM_LENGTH;
 228                         if (verbose > 2)
 229                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 230                         write_int(f_out, -1);
 231                         /* For inplace: redo phase turns off the backup
 232                          * flag so that we do a regular inplace send. */
 233                         make_backups = 0;
 234                         continue;
 235                 }
 236
 237                 iflags = read_item_attrs(f_in, f_out, i, &fnamecmp_type,
 238                                          xname, &xlen);
 239                 if (iflags == ITEM_IS_NEW) /* no-op packet */
 240                         continue;
 241
 242                 file = flist->files[i];
 243                 if (file->dir.root) {
 244                         /* N.B. We're sure that this fits, so offset is OK. */
 245                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 246                         if (!offset || fname[offset-1] != '/')
 247                                 fname[offset++] = '/';
 248                 } else
 249                         offset = 0;
 250                 fname2 = f_name_to(file, fname + offset);
 251
 252                 if (verbose > 2)
 253                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 254
 255                 if (!(iflags & ITEM_TRANSFER)) {
 256                         maybe_log_item(file, iflags, itemizing, xname);
 257                         continue;
 258                 }
 259                 if (phase == 2) {
 260                         rprintf(FERROR,
 261                                 "got transfer request in phase 2 [%s]\n",
 262                                 who_am_i());
 263                         exit_cleanup(RERR_PROTOCOL);
 264                 }
 265
 266                 updating_basis_file = inplace && (protocol_version >= 29
 267                         ? fnamecmp_type == FNAMECMP_FNAME : !make_backups);
 268
 269                 stats.current_file_index = i;
 270                 stats.num_transferred_files++;
 271                 stats.total_transferred_size += file->length;
 272
 273                 if (!do_xfers) { /* log the transfer */
 274                         if (!am_server && log_format)
 275                                 log_item(file, &stats, iflags, NULL);
 276                         write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
 277                                             xname, xlen);
 278                         continue;
 279                 }
 280
 281                 initial_stats = stats;
 282
 283                 if (!(s = receive_sums(f_in))) {
 284                         io_error |= IOERR_GENERAL;
 285                         rprintf(FERROR, "receive_sums failed\n");
 286                         return;
 287                 }
 288
 289                 fd = do_open(fname, O_RDONLY, 0);
 290                 if (fd == -1) {
 291                         if (errno == ENOENT) {
 292                                 enum logcode c = am_daemon
 293                                     && protocol_version < 28 ? FERROR
 294                                                              : FINFO;
 295                                 io_error |= IOERR_VANISHED;
 296                                 rprintf(c, "file has vanished: %s\n",
 297                                         full_fname(fname));
 298                         } else {
 299                                 io_error |= IOERR_GENERAL;
 300                                 rsyserr(FERROR, errno,
 301                                         "send_files failed to open %s",
 302                                         full_fname(fname));
 303                         }
 304                         free_sums(s);
 305                         continue;
 306                 }
 307
 308                 /* map the local file */
 309                 if (do_fstat(fd, &st) != 0) {
 310                         io_error |= IOERR_GENERAL;
 311                         rsyserr(FERROR, errno, "fstat failed");
 312                         free_sums(s);
 313                         close(fd);
 314                         return;
 315                 }
 316
 317                 if (st.st_size) {
 318                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 319                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 320                 } else
 321                         mbuf = NULL;
 322
 323                 if (verbose > 2) {
 324                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 325                                 safe_fname(fname), (double)st.st_size);
 326                 }
 327
 328                 write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
 329                                     xname, xlen);
 330                 write_sum_head(f_xfer, s);
 331
 332                 if (verbose > 2) {
 333                         rprintf(FINFO, "calling match_sums %s\n",
 334                                 safe_fname(fname));
 335                 }
 336
 337                 if (log_before_transfer)
 338                         log_item(file, &initial_stats, iflags, NULL);
 339                 else if (!am_server && verbose && do_progress)
 340                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 341
 342                 set_compression(fname);
 343
 344                 match_sums(f_xfer, s, mbuf, st.st_size);
 345                 if (do_progress)
 346                         end_progress(st.st_size);
 347
 348                 if (!log_before_transfer)
 349                         log_item(file, &initial_stats, iflags, NULL);
 350
 351                 if (mbuf) {
 352                         j = unmap_file(mbuf);
 353                         if (j) {
 354                                 io_error |= IOERR_GENERAL;
 355                                 rsyserr(FERROR, j,
 356                                         "read errors mapping %s",
 357                                         full_fname(fname));
 358                         }
 359                 }
 360                 close(fd);
 361
 362                 free_sums(s);
 363
 364                 if (verbose > 2) {
 365                         rprintf(FINFO, "sender finished %s\n",
 366                                 safe_fname(fname));
 367                 }
 368
 369                 /* Flag that we actually sent this entry. */
 370                 file->flags |= FLAG_SENT;
 371         }
 372         make_backups = save_make_backups;
 373
 374         if (verbose > 2)
 375                 rprintf(FINFO, "send files finished\n");
 376
 377         match_report();
 378
 379         write_int(f_out, -1);
 380 }