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 dry_run;
  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 struct stats stats;
  38 extern struct file_list *the_file_list;
  39 extern char *log_format;
  40
  41
  42 /**
  43  * @file
  44  *
  45  * The sender gets checksums from the generator, calculates deltas,
  46  * and transmits them to the receiver.  The sender process runs on the
  47  * machine holding the source files.
  48  **/
  49
  50 /**
  51  * Receive the checksums for a buffer
  52  **/
  53 static struct sum_struct *receive_sums(int f)
  54 {
  55         struct sum_struct *s;
  56         int32 i;
  57         OFF_T offset = 0;
  58
  59         if (!(s = new(struct sum_struct)))
  60                 out_of_memory("receive_sums");
  61
  62         read_sum_head(f, s);
  63
  64         s->sums = NULL;
  65
  66         if (verbose > 3) {
  67                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  68                         (double)s->count, (long)s->blength, (long)s->remainder);
  69         }
  70
  71         if (s->count == 0)
  72                 return(s);
  73
  74         if (!(s->sums = new_array(struct sum_buf, s->count)))
  75                 out_of_memory("receive_sums");
  76
  77         for (i = 0; i < s->count; i++) {
  78                 s->sums[i].sum1 = read_int(f);
  79                 read_buf(f, s->sums[i].sum2, s->s2length);
  80
  81                 s->sums[i].offset = offset;
  82                 s->sums[i].flags = 0;
  83
  84                 if (i == s->count-1 && s->remainder != 0)
  85                         s->sums[i].len = s->remainder;
  86                 else
  87                         s->sums[i].len = s->blength;
  88                 offset += s->sums[i].len;
  89
  90                 if (verbose > 3) {
  91                         rprintf(FINFO,
  92                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
  93                                 i, s->sums[i].len, (double)s->sums[i].offset,
  94                                 s->sums[i].sum1);
  95                 }
  96         }
  97
  98         s->flength = offset;
  99
 100         return s;
 101 }
 102
 103 void successful_send(int ndx)
 104 {
 105         char fname[MAXPATHLEN];
 106         struct file_struct *file;
 107         unsigned int offset;
 108
 109         if (ndx < 0 || ndx >= the_file_list->count)
 110                 return;
 111
 112         file = the_file_list->files[ndx];
 113         /* The generator might tell us about symlinks we didn't send. */
 114         if (!(file->flags & FLAG_SENT) && !S_ISLNK(file->mode))
 115                 return;
 116         if (file->dir.root) {
 117                 offset = stringjoin(fname, sizeof fname,
 118                                     file->dir.root, "/", NULL);
 119         } else
 120                 offset = 0;
 121         f_name_to(file, fname + offset);
 122         if (remove_sent_files && do_unlink(fname) == 0 && verbose > 1) {
 123                 rprintf(FINFO, "sender removed %s\n",
 124                         safe_fname(fname + offset));
 125         }
 126 }
 127
 128 /* This is also used by receive.c with f_out = -1. */
 129 int read_iflags(int f_in, int f_out, int ndx, char *buf)
 130 {
 131         int len;
 132         int iflags = protocol_version >= 29 ? read_shortint(f_in)
 133                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 134         int isave = iflags; /* XXX remove soon */
 135
 136         /* Handle the new keep-alive (no-op) packet. */
 137         if (ndx == the_file_list->count && iflags == ITEM_IS_NEW)
 138                 ;
 139         else if (ndx < 0 || ndx >= the_file_list->count) {
 140                 rprintf(FERROR, "Invalid file index %d (count=%d) [%s]\n",
 141                         ndx, the_file_list->count, who_am_i());
 142                 exit_cleanup(RERR_PROTOCOL);
 143         } else if (iflags == ITEM_IS_NEW) {
 144                 rprintf(FERROR, "Invalid itemized flag word [%s]\n",
 145                         who_am_i());
 146                 exit_cleanup(RERR_PROTOCOL);
 147         }
 148
 149         if (iflags & ITEM_HARD_LINKED)
 150                 len = read_vstring(f_in, buf, MAXPATHLEN);
 151         else {
 152                 *buf = '\0';
 153                 len = -1;
 154         }
 155
 156         /* XXX Temporary backward compatibility when talking to 2.6.4pre[12] */
 157         if (protocol_version >= 29 && iflags & ITEM_TRANSFER
 158             && !S_ISREG(the_file_list->files[ndx]->mode)) {
 159                 iflags &= ~ITEM_TRANSFER;
 160                 iflags |= ITEM_LOCAL_CHANGE;
 161         }
 162
 163         if (iflags & ITEM_TRANSFER) {
 164                 if (!S_ISREG(the_file_list->files[ndx]->mode)) {
 165                         rprintf(FERROR,
 166                                 "received index of non-regular file: %d [%s]\n",
 167                                 ndx, who_am_i());
 168                         exit_cleanup(RERR_PROTOCOL);
 169                 }
 170         } else if (f_out >= 0) {
 171                 write_int(f_out, ndx);
 172                 write_shortint(f_out, isave /*XXX iflags */);
 173                 if (len >= 0)
 174                         write_vstring(f_out, buf, len);
 175         }
 176
 177         return iflags;
 178 }
 179
 180 void send_files(struct file_list *flist, int f_out, int f_in)
 181 {
 182         int fd = -1;
 183         struct sum_struct *s;
 184         struct map_struct *mbuf = NULL;
 185         STRUCT_STAT st;
 186         char *fname2, fname[MAXPATHLEN];
 187         char fnametmp[MAXPATHLEN];
 188         int iflags;
 189         struct file_struct *file;
 190         int phase = 0;
 191         struct stats initial_stats;
 192         int save_make_backups = make_backups;
 193         int itemizing = am_daemon ? daemon_log_format_has_i
 194                       : !am_server && log_format_has_i;
 195         int i, j;
 196
 197         if (verbose > 2)
 198                 rprintf(FINFO, "send_files starting\n");
 199
 200         while (1) {
 201                 unsigned int offset;
 202
 203                 i = read_int(f_in);
 204                 if (i == -1) {
 205                         if (phase == 0) {
 206                                 phase++;
 207                                 csum_length = SUM_LENGTH;
 208                                 write_int(f_out, -1);
 209                                 if (verbose > 2)
 210                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 211                                 /* For inplace: redo phase turns off the backup
 212                                  * flag so that we do a regular inplace send. */
 213                                 make_backups = 0;
 214                                 continue;
 215                         }
 216                         break;
 217                 }
 218
 219                 iflags = read_iflags(f_in, f_out, i, fnametmp);
 220                 if (iflags == ITEM_IS_NEW) /* no-op packet */
 221                         continue;
 222
 223                 file = flist->files[i];
 224                 if (file->dir.root) {
 225                         /* N.B. We're sure that this fits, so offset is OK. */
 226                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 227                         if (!offset || fname[offset-1] != '/')
 228                                 fname[offset++] = '/';
 229                 } else
 230                         offset = 0;
 231                 fname2 = f_name_to(file, fname + offset);
 232
 233                 if (verbose > 2)
 234                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 235
 236                 if (!(iflags & ITEM_TRANSFER)) {
 237                         maybe_log_item(file, iflags, itemizing, fnametmp);
 238                         continue;
 239                 }
 240
 241                 if (inplace && protocol_version >= 29) {
 242                         updating_basis_file = !(iflags & ITEM_USING_ALT_BASIS);
 243                 } else
 244                         updating_basis_file = inplace && !make_backups;
 245
 246                 stats.current_file_index = i;
 247                 stats.num_transferred_files++;
 248                 stats.total_transferred_size += file->length;
 249
 250                 if (dry_run) { /* log the transfer */
 251                         if (!am_server && log_format)
 252                                 log_item(file, &stats, iflags, NULL);
 253                         write_int(f_out, i);
 254                         if (protocol_version >= 29)
 255                                 write_shortint(f_out, iflags);
 256                         continue;
 257                 }
 258
 259                 initial_stats = stats;
 260
 261                 if (!(s = receive_sums(f_in))) {
 262                         io_error |= IOERR_GENERAL;
 263                         rprintf(FERROR, "receive_sums failed\n");
 264                         return;
 265                 }
 266
 267                 fd = do_open(fname, O_RDONLY, 0);
 268                 if (fd == -1) {
 269                         if (errno == ENOENT) {
 270                                 enum logcode c = am_daemon
 271                                     && protocol_version < 28 ? FERROR
 272                                                              : FINFO;
 273                                 io_error |= IOERR_VANISHED;
 274                                 rprintf(c, "file has vanished: %s\n",
 275                                         full_fname(fname));
 276                         } else {
 277                                 io_error |= IOERR_GENERAL;
 278                                 rsyserr(FERROR, errno,
 279                                         "send_files failed to open %s",
 280                                         full_fname(fname));
 281                         }
 282                         free_sums(s);
 283                         continue;
 284                 }
 285
 286                 /* map the local file */
 287                 if (do_fstat(fd, &st) != 0) {
 288                         io_error |= IOERR_GENERAL;
 289                         rsyserr(FERROR, errno, "fstat failed");
 290                         free_sums(s);
 291                         close(fd);
 292                         return;
 293                 }
 294
 295                 if (st.st_size) {
 296                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 297                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 298                 } else
 299                         mbuf = NULL;
 300
 301                 if (verbose > 2) {
 302                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 303                                 safe_fname(fname), (double)st.st_size);
 304                 }
 305
 306                 write_int(f_out, i);
 307                 if (protocol_version >= 29)
 308                         write_shortint(f_out, iflags);
 309                 write_sum_head(f_out, s);
 310
 311                 if (verbose > 2) {
 312                         rprintf(FINFO, "calling match_sums %s\n",
 313                                 safe_fname(fname));
 314                 }
 315
 316                 if (log_before_transfer)
 317                         log_item(file, &initial_stats, iflags, NULL);
 318                 else if (!am_server && verbose && do_progress)
 319                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 320
 321                 set_compression(fname);
 322
 323                 match_sums(f_out, s, mbuf, st.st_size);
 324                 if (!log_before_transfer)
 325                         log_item(file, &initial_stats, iflags, NULL);
 326
 327                 if (mbuf) {
 328                         j = unmap_file(mbuf);
 329                         if (j) {
 330                                 io_error |= IOERR_GENERAL;
 331                                 rsyserr(FERROR, j,
 332                                         "read errors mapping %s",
 333                                         full_fname(fname));
 334                         }
 335                 }
 336                 close(fd);
 337
 338                 free_sums(s);
 339
 340                 if (verbose > 2) {
 341                         rprintf(FINFO, "sender finished %s\n",
 342                                 safe_fname(fname));
 343                 }
 344
 345                 /* Flag that we actually sent this entry. */
 346                 file->flags |= FLAG_SENT;
 347         }
 348         make_backups = save_make_backups;
 349
 350         if (verbose > 2)
 351                 rprintf(FINFO, "send files finished\n");
 352
 353         match_report();
 354
 355         write_int(f_out, -1);
 356 }