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