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         flist = flist_for_ndx(ndx, "successful_send");
 131         file = flist->files[ndx - flist->ndx_start];
 132         if (!change_pathname(file, NULL, 0))
 133                 return;
 134         f_name(file, fname);
 135
 136         if (do_unlink(fname) == 0) {
 137                 if (verbose > 1)
 138                         rprintf(FINFO, "sender removed %s\n", fname);
 139         } else
 140                 rsyserr(FERROR, errno, "sender failed to remove %s", fname);
 141 }
 142
 143 static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 144                                 const char *fname, struct file_struct *file,
 145                                 uchar fnamecmp_type, char *buf, int len)
 146 {
 147         write_ndx(f_out, ndx);
 148         if (protocol_version < 29)
 149                 return;
 150         write_shortint(f_out, iflags);
 151         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 152                 write_byte(f_out, fnamecmp_type);
 153         if (iflags & ITEM_XNAME_FOLLOWS)
 154                 write_vstring(f_out, buf, len);
 155 #ifdef SUPPORT_XATTRS
 156         if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
 157                 send_xattr_request(fname, file, f_out);
 158 #endif
 159 }
 160
 161 void send_files(int f_in, int f_out)
 162 {
 163         int fd = -1;
 164         struct sum_struct *s;
 165         struct map_struct *mbuf = NULL;
 166         STRUCT_STAT st;
 167         char fname[MAXPATHLEN], xname[MAXPATHLEN];
 168         const char *path, *slash;
 169         uchar fnamecmp_type;
 170         int iflags, xlen;
 171         struct file_struct *file;
 172         int phase = 0, max_phase = protocol_version >= 29 ? 2 : 1;
 173         struct stats initial_stats;
 174         int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
 175         enum logcode log_code = log_before_transfer ? FLOG : FINFO;
 176         int f_xfer = write_batch < 0 ? batch_fd : f_out;
 177         int ndx, j;
 178
 179         if (verbose > 2)
 180                 rprintf(FINFO, "send_files starting\n");
 181
 182         while (1) {
 183                 if (inc_recurse)
 184                         send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
 185
 186                 /* This call also sets cur_flist. */
 187                 ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
 188                                          xname, &xlen);
 189                 if (ndx == NDX_DONE) {
 190                         if (inc_recurse && first_flist) {
 191                                 flist_free(first_flist);
 192                                 if (first_flist) {
 193                                         write_ndx(f_out, NDX_DONE);
 194                                         continue;
 195                                 }
 196                         }
 197                         if (++phase > max_phase)
 198                                 break;
 199                         if (verbose > 2)
 200                                 rprintf(FINFO, "send_files phase=%d\n", phase);
 201                         write_ndx(f_out, NDX_DONE);
 202                         continue;
 203                 }
 204
 205                 if (inc_recurse)
 206                         send_extra_file_list(f_out, FILECNT_LOOKAHEAD);
 207
 208                 if (ndx - cur_flist->ndx_start >= 0)
 209                         file = cur_flist->files[ndx - cur_flist->ndx_start];
 210                 else
 211                         file = dir_flist->files[cur_flist->parent_ndx];
 212                 if (F_PATHNAME(file)) {
 213                         path = F_PATHNAME(file);
 214                         slash = "/";
 215                 } else {
 216                         path = slash = "";
 217                 }
 218                 if (!change_pathname(file, NULL, 0))
 219                         continue;
 220                 f_name(file, fname);
 221
 222                 if (verbose > 2)
 223                         rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
 224
 225 #ifdef SUPPORT_XATTRS
 226                 if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
 227                         recv_xattr_request(file, f_in);
 228 #endif
 229
 230                 if (!(iflags & ITEM_TRANSFER)) {
 231                         maybe_log_item(file, iflags, itemizing, xname);
 232                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 233                                             fnamecmp_type, xname, xlen);
 234                         continue;
 235                 }
 236                 if (phase == 2) {
 237                         rprintf(FERROR,
 238                                 "got transfer request in phase 2 [%s]\n",
 239                                 who_am_i());
 240                         exit_cleanup(RERR_PROTOCOL);
 241                 }
 242
 243                 if (file->flags & FLAG_FILE_SENT) {
 244                         if (csum_length == SHORT_SUM_LENGTH) {
 245                                 /* For inplace: redo phase turns off the backup
 246                                  * flag so that we do a regular inplace send. */
 247                                 make_backups = -make_backups;
 248                                 append_mode = -append_mode;
 249                                 csum_length = SUM_LENGTH;
 250                         }
 251                 } else {
 252                         if (csum_length != SHORT_SUM_LENGTH) {
 253                                 make_backups = -make_backups;
 254                                 append_mode = -append_mode;
 255                                 csum_length = SHORT_SUM_LENGTH;
 256                         }
 257                 }
 258
 259                 updating_basis_file = inplace && (protocol_version >= 29
 260                         ? fnamecmp_type == FNAMECMP_FNAME : make_backups <= 0);
 261
 262                 if (!am_server && do_progress)
 263                         set_current_file_index(file, ndx);
 264                 stats.num_transferred_files++;
 265                 stats.total_transferred_size += F_LENGTH(file);
 266
 267                 if (!do_xfers) { /* log the transfer */
 268                         log_item(FCLIENT, file, &stats, iflags, NULL);
 269                         write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 270                                             fnamecmp_type, xname, xlen);
 271                         continue;
 272                 }
 273
 274                 initial_stats = stats;
 275
 276                 if (!(s = receive_sums(f_in))) {
 277                         io_error |= IOERR_GENERAL;
 278                         rprintf(FERROR_XFER, "receive_sums failed\n");
 279                         exit_cleanup(RERR_PROTOCOL);
 280                 }
 281
 282                 fd = do_open(fname, O_RDONLY, 0);
 283                 if (fd == -1) {
 284                         if (errno == ENOENT) {
 285                                 enum logcode c = am_daemon
 286                                     && protocol_version < 28 ? FERROR
 287                                                              : FWARNING;
 288                                 io_error |= IOERR_VANISHED;
 289                                 rprintf(c, "file has vanished: %s\n",
 290                                         full_fname(fname));
 291                         } else {
 292                                 io_error |= IOERR_GENERAL;
 293                                 rsyserr(FERROR_XFER, errno,
 294                                         "send_files failed to open %s",
 295                                         full_fname(fname));
 296                         }
 297                         free_sums(s);
 298                         if (protocol_version >= 30)
 299                                 send_msg_int(MSG_NO_SEND, ndx);
 300                         continue;
 301                 }
 302
 303                 /* map the local file */
 304                 if (do_fstat(fd, &st) != 0) {
 305                         io_error |= IOERR_GENERAL;
 306                         rsyserr(FERROR_XFER, errno, "fstat failed");
 307                         free_sums(s);
 308                         close(fd);
 309                         exit_cleanup(RERR_PROTOCOL);
 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%s%s of size %.0f\n",
 320                                 path,slash,fname, (double)st.st_size);
 321                 }
 322
 323                 write_ndx_and_attrs(f_out, ndx, iflags, fname, file,
 324                                     fnamecmp_type, xname, xlen);
 325                 write_sum_head(f_xfer, s);
 326
 327                 if (verbose > 2)
 328                         rprintf(FINFO, "calling match_sums %s%s%s\n", path,slash,fname);
 329
 330                 if (log_before_transfer)
 331                         log_item(FCLIENT, file, &initial_stats, iflags, NULL);
 332                 else if (!am_server && verbose && do_progress)
 333                         rprintf(FCLIENT, "%s\n", fname);
 334
 335                 set_compression(fname);
 336
 337                 match_sums(f_xfer, s, mbuf, st.st_size);
 338                 if (do_progress)
 339                         end_progress(st.st_size);
 340
 341                 log_item(log_code, file, &initial_stats, iflags, NULL);
 342
 343                 if (mbuf) {
 344                         j = unmap_file(mbuf);
 345                         if (j) {
 346                                 io_error |= IOERR_GENERAL;
 347                                 rsyserr(FERROR_XFER, j,
 348                                         "read errors mapping %s",
 349                                         full_fname(fname));
 350                         }
 351                 }
 352                 close(fd);
 353
 354                 free_sums(s);
 355
 356                 if (verbose > 2)
 357                         rprintf(FINFO, "sender finished %s%s%s\n", path,slash,fname);
 358
 359                 /* Flag that we actually sent this entry. */
 360                 file->flags |= FLAG_FILE_SENT;
 361         }
 362         if (make_backups < 0)
 363                 make_backups = -make_backups;
 364
 365         if (verbose > 2)
 366                 rprintf(FINFO, "send files finished\n");
 367
 368         match_report();
 369
 370         write_ndx(f_out, NDX_DONE);
 371 }