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 what_has_changed;
  24 extern int csum_length;
  25 extern struct stats stats;
  26 extern int io_error;
  27 extern int dry_run;
  28 extern int am_server;
  29 extern int am_daemon;
  30 extern int protocol_version;
  31 extern int updating_basis_file;
  32 extern int make_backups;
  33 extern int inplace;
  34 extern struct stats stats;
  35
  36
  37 /**
  38  * @file
  39  *
  40  * The sender gets checksums from the generator, calculates deltas,
  41  * and transmits them to the receiver.  The sender process runs on the
  42  * machine holding the source files.
  43  **/
  44
  45 /**
  46  * Receive the checksums for a buffer
  47  **/
  48 static struct sum_struct *receive_sums(int f)
  49 {
  50         struct sum_struct *s;
  51         int32 i;
  52         OFF_T offset = 0;
  53
  54         if (!(s = new(struct sum_struct)))
  55                 out_of_memory("receive_sums");
  56
  57         read_sum_head(f, s);
  58
  59         s->sums = NULL;
  60
  61         if (verbose > 3) {
  62                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  63                         (double)s->count, (long)s->blength, (long)s->remainder);
  64         }
  65
  66         if (s->count == 0)
  67                 return(s);
  68
  69         if (!(s->sums = new_array(struct sum_buf, s->count)))
  70                 out_of_memory("receive_sums");
  71
  72         for (i = 0; i < s->count; i++) {
  73                 s->sums[i].sum1 = read_int(f);
  74                 read_buf(f, s->sums[i].sum2, s->s2length);
  75
  76                 s->sums[i].offset = offset;
  77                 s->sums[i].flags = 0;
  78
  79                 if (i == s->count-1 && s->remainder != 0)
  80                         s->sums[i].len = s->remainder;
  81                 else
  82                         s->sums[i].len = s->blength;
  83                 offset += s->sums[i].len;
  84
  85                 if (verbose > 3) {
  86                         rprintf(FINFO,
  87                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
  88                                 i, s->sums[i].len, (double)s->sums[i].offset,
  89                                 s->sums[i].sum1);
  90                 }
  91         }
  92
  93         s->flength = offset;
  94
  95         return s;
  96 }
  97
  98
  99
 100 void send_files(struct file_list *flist, int f_out, int f_in)
 101 {
 102         int fd = -1;
 103         struct sum_struct *s;
 104         struct map_struct *mbuf = NULL;
 105         STRUCT_STAT st;
 106         char *fname2, fname[MAXPATHLEN];
 107         int i;
 108         struct file_struct *file;
 109         int phase = 0;
 110         struct stats initial_stats;
 111         int save_make_backups = make_backups;
 112         int j;
 113
 114         if (verbose > 2)
 115                 rprintf(FINFO, "send_files starting\n");
 116
 117         while (1) {
 118                 unsigned int offset;
 119
 120                 i = read_int(f_in);
 121                 if (i == -1) {
 122                         if (phase == 0) {
 123                                 phase++;
 124                                 csum_length = SUM_LENGTH;
 125                                 write_int(f_out, -1);
 126                                 if (verbose > 2)
 127                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 128                                 /* For inplace: redo phase turns off the backup
 129                                  * flag so that we do a regular inplace send. */
 130                                 make_backups = 0;
 131                                 continue;
 132                         }
 133                         break;
 134                 }
 135
 136                 if (i < 0 || i >= flist->count) {
 137                         rprintf(FERROR, "Invalid file index %d (count=%d)\n",
 138                                 i, flist->count);
 139                         exit_cleanup(RERR_PROTOCOL);
 140                 }
 141
 142                 if (inplace && protocol_version >= 29) {
 143                         uchar fnamecmp_type = read_byte(f_in);
 144                         updating_basis_file = fnamecmp_type == FNAMECMP_FNAME;
 145                 } else
 146                         updating_basis_file = inplace && !make_backups;
 147
 148                 file = flist->files[i];
 149                 if (S_ISDIR(file->mode)) {
 150                         rprintf(FERROR, "[%s] got index of directory: %d\n",
 151                                 who_am_i(), i);
 152                         exit_cleanup(RERR_PROTOCOL);
 153                 }
 154
 155                 stats.current_file_index = i;
 156                 stats.num_transferred_files++;
 157                 stats.total_transferred_size += file->length;
 158
 159                 if (file->dir.root) {
 160                         /* N.B. We're sure that this fits, so offset is OK. */
 161                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 162                         if (!offset || fname[offset-1] != '/')
 163                                 fname[offset++] = '/';
 164                 } else
 165                         offset = 0;
 166                 fname2 = f_name_to(file, fname + offset);
 167
 168                 if (verbose > 2)
 169                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 170
 171                 if (dry_run) { /* log the transfer */
 172                         if (!am_server && verbose && !what_has_changed)
 173                                 rprintf(FINFO, "%s\n", safe_fname(fname2));
 174                         write_int(f_out, i);
 175                         continue;
 176                 }
 177
 178                 initial_stats = stats;
 179
 180                 if (!(s = receive_sums(f_in))) {
 181                         io_error |= IOERR_GENERAL;
 182                         rprintf(FERROR, "receive_sums failed\n");
 183                         return;
 184                 }
 185
 186                 fd = do_open(fname, O_RDONLY, 0);
 187                 if (fd == -1) {
 188                         if (errno == ENOENT) {
 189                                 enum logcode c = am_daemon
 190                                     && protocol_version < 28 ? FERROR
 191                                                              : FINFO;
 192                                 io_error |= IOERR_VANISHED;
 193                                 rprintf(c, "file has vanished: %s\n",
 194                                         full_fname(fname));
 195                         } else {
 196                                 io_error |= IOERR_GENERAL;
 197                                 rsyserr(FERROR, errno,
 198                                         "send_files failed to open %s",
 199                                         full_fname(fname));
 200                         }
 201                         free_sums(s);
 202                         continue;
 203                 }
 204
 205                 /* map the local file */
 206                 if (do_fstat(fd, &st) != 0) {
 207                         io_error |= IOERR_GENERAL;
 208                         rsyserr(FERROR, errno, "fstat failed");
 209                         free_sums(s);
 210                         close(fd);
 211                         return;
 212                 }
 213
 214                 if (st.st_size) {
 215                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 216                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 217                 } else
 218                         mbuf = NULL;
 219
 220                 if (verbose > 2) {
 221                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 222                                 safe_fname(fname), (double)st.st_size);
 223                 }
 224
 225                 write_int(f_out, i);
 226                 write_sum_head(f_out, s);
 227
 228                 if (verbose > 2) {
 229                         rprintf(FINFO, "calling match_sums %s\n",
 230                                 safe_fname(fname));
 231                 }
 232
 233                 /* log the transfer */
 234                 if (!am_server && verbose && !what_has_changed)
 235                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 236
 237                 set_compression(fname);
 238
 239                 match_sums(f_out, s, mbuf, st.st_size);
 240                 log_send(file, &initial_stats);
 241
 242                 if (mbuf) {
 243                         j = unmap_file(mbuf);
 244                         if (j) {
 245                                 io_error |= IOERR_GENERAL;
 246                                 rsyserr(FERROR, j,
 247                                         "read errors mapping %s",
 248                                         full_fname(fname));
 249                         }
 250                 }
 251                 close(fd);
 252
 253                 free_sums(s);
 254
 255                 if (verbose > 2) {
 256                         rprintf(FINFO, "sender finished %s\n",
 257                                 safe_fname(fname));
 258                 }
 259         }
 260         make_backups = save_make_backups;
 261
 262         if (verbose > 2)
 263                 rprintf(FINFO, "send files finished\n");
 264
 265         match_report();
 266
 267         write_int(f_out, -1);
 268 }