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