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 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 129                                 uchar fnamecmp_type, char *buf, int len)
 130 {
 131         write_int(f_out, ndx);
 132         if (protocol_version < 29)
 133                 return;
 134         write_shortint(f_out, iflags);
 135         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 136                 write_byte(f_out, fnamecmp_type);
 137         if (iflags & ITEM_XNAME_FOLLOWS)
 138                 write_vstring(f_out, buf, len);
 139 }
 140
 141 /* This is also used by receive.c with f_out = -1. */
 142 int read_item_attrs(int f_in, int f_out, int ndx, uchar *type_ptr,
 143                     char *buf, int *len_ptr)
 144 {
 145         int len;
 146         uchar fnamecmp_type = FNAMECMP_FNAME;
 147         int iflags = protocol_version >= 29 ? read_shortint(f_in)
 148                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 149         int isave = iflags; /* XXX remove soon */
 150
 151         /* Handle the new keep-alive (no-op) packet. */
 152         if (ndx == the_file_list->count && iflags == ITEM_IS_NEW)
 153                 ;
 154         else if (ndx < 0 || ndx >= the_file_list->count) {
 155                 rprintf(FERROR, "Invalid file index: %d (count=%d) [%s]\n",
 156                         ndx, the_file_list->count, who_am_i());
 157                 exit_cleanup(RERR_PROTOCOL);
 158         } else if (iflags == ITEM_IS_NEW) {
 159                 rprintf(FERROR, "Invalid itemized flag word: %x [%s]\n",
 160                         iflags, who_am_i());
 161                 exit_cleanup(RERR_PROTOCOL);
 162         }
 163
 164         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 165                 fnamecmp_type = read_byte(f_in);
 166         *type_ptr = fnamecmp_type;
 167
 168         if (iflags & ITEM_XNAME_FOLLOWS) {
 169                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 170                         exit_cleanup(RERR_PROTOCOL);
 171         } else {
 172                 *buf = '\0';
 173                 len = -1;
 174         }
 175         *len_ptr = len;
 176
 177         /* XXX Temporary backward compatibility when talking to 2.6.4pre[12] */
 178         if (protocol_version >= 29 && iflags & ITEM_TRANSFER
 179             && !S_ISREG(the_file_list->files[ndx]->mode)) {
 180                 iflags &= ~ITEM_TRANSFER;
 181                 iflags |= ITEM_LOCAL_CHANGE;
 182         }
 183
 184         if (iflags & ITEM_TRANSFER) {
 185                 if (!S_ISREG(the_file_list->files[ndx]->mode)) {
 186                         rprintf(FERROR,
 187                                 "received request to transfer non-regular file: %d [%s]\n",
 188                                 ndx, who_am_i());
 189                         exit_cleanup(RERR_PROTOCOL);
 190                 }
 191         } else if (f_out >= 0) {
 192                 write_ndx_and_attrs(f_out, ndx, isave /*XXX iflags */,
 193                                     fnamecmp_type, buf, len);
 194         }
 195
 196         return iflags;
 197 }
 198
 199 void send_files(struct file_list *flist, int f_out, int f_in)
 200 {
 201         int fd = -1;
 202         struct sum_struct *s;
 203         struct map_struct *mbuf = NULL;
 204         STRUCT_STAT st;
 205         char *fname2, fname[MAXPATHLEN];
 206         char xname[MAXPATHLEN];
 207         uchar fnamecmp_type;
 208         int iflags, xlen;
 209         struct file_struct *file;
 210         int phase = 0;
 211         struct stats initial_stats;
 212         int save_make_backups = make_backups;
 213         int itemizing = am_daemon ? daemon_log_format_has_i
 214                       : !am_server && log_format_has_i;
 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)
 226                                 break;
 227                         phase = 1;
 228                         csum_length = SUM_LENGTH;
 229                         if (verbose > 2)
 230                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 231                         write_int(f_out, -1);
 232                         /* For inplace: redo phase turns off the backup
 233                          * flag so that we do a regular inplace send. */
 234                         make_backups = 0;
 235                         continue;
 236                 }
 237
 238                 iflags = read_item_attrs(f_in, f_out, i, &fnamecmp_type,
 239                                          xname, &xlen);
 240                 if (iflags == ITEM_IS_NEW) /* no-op packet */
 241                         continue;
 242
 243                 file = flist->files[i];
 244                 if (file->dir.root) {
 245                         /* N.B. We're sure that this fits, so offset is OK. */
 246                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 247                         if (!offset || fname[offset-1] != '/')
 248                                 fname[offset++] = '/';
 249                 } else
 250                         offset = 0;
 251                 fname2 = f_name_to(file, fname + offset);
 252
 253                 if (verbose > 2)
 254                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 255
 256                 if (!(iflags & ITEM_TRANSFER)) {
 257                         maybe_log_item(file, iflags, itemizing, xname);
 258                         continue;
 259                 }
 260
 261                 updating_basis_file = inplace && (protocol_version >= 29
 262                         ? fnamecmp_type == FNAMECMP_FNAME : !make_backups);
 263
 264                 stats.current_file_index = i;
 265                 stats.num_transferred_files++;
 266                 stats.total_transferred_size += file->length;
 267
 268                 if (dry_run) { /* log the transfer */
 269                         if (!am_server && log_format)
 270                                 log_item(file, &stats, iflags, NULL);
 271                         write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
 272                                             xname, xlen);
 273                         continue;
 274                 }
 275
 276                 initial_stats = stats;
 277
 278                 if (!(s = receive_sums(f_in))) {
 279                         io_error |= IOERR_GENERAL;
 280                         rprintf(FERROR, "receive_sums failed\n");
 281                         return;
 282                 }
 283
 284                 fd = do_open(fname, O_RDONLY, 0);
 285                 if (fd == -1) {
 286                         if (errno == ENOENT) {
 287                                 enum logcode c = am_daemon
 288                                     && protocol_version < 28 ? FERROR
 289                                                              : FINFO;
 290                                 io_error |= IOERR_VANISHED;
 291                                 rprintf(c, "file has vanished: %s\n",
 292                                         full_fname(fname));
 293                         } else {
 294                                 io_error |= IOERR_GENERAL;
 295                                 rsyserr(FERROR, errno,
 296                                         "send_files failed to open %s",
 297                                         full_fname(fname));
 298                         }
 299                         free_sums(s);
 300                         continue;
 301                 }
 302
 303                 /* map the local file */
 304                 if (do_fstat(fd, &st) != 0) {
 305                         io_error |= IOERR_GENERAL;
 306                         rsyserr(FERROR, errno, "fstat failed");
 307                         free_sums(s);
 308                         close(fd);
 309                         return;
 310                 }
 311
 312                 if (st.st_size) {
 313                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 314                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 315                 } else
 316                         mbuf = NULL;
 317
 318                 if (verbose > 2) {
 319                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 320                                 safe_fname(fname), (double)st.st_size);
 321                 }
 322
 323                 write_ndx_and_attrs(f_out, i, iflags, fnamecmp_type,
 324                                     xname, xlen);
 325                 write_sum_head(f_out, s);
 326
 327                 if (verbose > 2) {
 328                         rprintf(FINFO, "calling match_sums %s\n",
 329                                 safe_fname(fname));
 330                 }
 331
 332                 if (log_before_transfer)
 333                         log_item(file, &initial_stats, iflags, NULL);
 334                 else if (!am_server && verbose && do_progress)
 335                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 336
 337                 set_compression(fname);
 338
 339                 match_sums(f_out, s, mbuf, st.st_size);
 340                 if (do_progress)
 341                         end_progress(st.st_size);
 342
 343                 if (!log_before_transfer)
 344                         log_item(file, &initial_stats, iflags, NULL);
 345
 346                 if (mbuf) {
 347                         j = unmap_file(mbuf);
 348                         if (j) {
 349                                 io_error |= IOERR_GENERAL;
 350                                 rsyserr(FERROR, j,
 351                                         "read errors mapping %s",
 352                                         full_fname(fname));
 353                         }
 354                 }
 355                 close(fd);
 356
 357                 free_sums(s);
 358
 359                 if (verbose > 2) {
 360                         rprintf(FINFO, "sender finished %s\n",
 361                                 safe_fname(fname));
 362                 }
 363
 364                 /* Flag that we actually sent this entry. */
 365                 file->flags |= FLAG_SENT;
 366         }
 367         make_backups = save_make_backups;
 368
 369         if (verbose > 2)
 370                 rprintf(FINFO, "send files finished\n");
 371
 372         match_report();
 373
 374         write_int(f_out, -1);
 375 }