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
  31
  32 /**
  33  * @file
  34  *
  35  * The sender gets checksums from the generator, calculates deltas,
  36  * and transmits them to the receiver.  The sender process runs on the
  37  * machine holding the source files.
  38  **/
  39 void read_sum_head(int f, struct sum_struct *sum)
  40 {
  41         sum->count = read_int(f);
  42         sum->blength = read_int(f);
  43         if (protocol_version < 27) {
  44                 sum->s2length = csum_length;
  45         } else {
  46                 sum->s2length = read_int(f);
  47                 if (sum->s2length > MD4_SUM_LENGTH) {
  48                         rprintf(FERROR, "Invalid checksum length %ld\n",
  49                             (long)sum->s2length);
  50                         exit_cleanup(RERR_PROTOCOL);
  51                 }
  52         }
  53         sum->remainder = read_int(f);
  54 }
  55
  56 /**
  57  * Receive the checksums for a buffer
  58  **/
  59 static struct sum_struct *receive_sums(int f)
  60 {
  61         struct sum_struct *s;
  62         int i;
  63         OFF_T offset = 0;
  64
  65         s = new(struct sum_struct);
  66         if (!s) out_of_memory("receive_sums");
  67
  68         read_sum_head(f, s);
  69
  70         s->sums = NULL;
  71
  72         if (verbose > 3) {
  73                 rprintf(FINFO, "count=%ld n=%u rem=%u\n",
  74                         (long)s->count, s->blength, s->remainder);
  75         }
  76
  77         if (s->count == 0)
  78                 return(s);
  79
  80         s->sums = new_array(struct sum_buf, s->count);
  81         if (!s->sums) out_of_memory("receive_sums");
  82
  83         for (i = 0; i < (int) s->count; i++) {
  84                 s->sums[i].sum1 = read_int(f);
  85                 read_buf(f, s->sums[i].sum2, s->s2length);
  86
  87                 s->sums[i].offset = offset;
  88                 s->sums[i].i = i;
  89
  90                 if (i == (int) s->count-1 && s->remainder != 0) {
  91                         s->sums[i].len = s->remainder;
  92                 } else {
  93                         s->sums[i].len = s->blength;
  94                 }
  95                 offset += s->sums[i].len;
  96
  97                 if (verbose > 3)
  98                         rprintf(FINFO, "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
  99                                 i, s->sums[i].len, (double)s->sums[i].offset, s->sums[i].sum1);
 100         }
 101
 102         s->flength = offset;
 103
 104         return s;
 105 }
 106
 107
 108
 109 void send_files(struct file_list *flist, int f_out, int f_in)
 110 {
 111         int fd = -1;
 112         struct sum_struct *s;
 113         struct map_struct *mbuf = NULL;
 114         STRUCT_STAT st;
 115         char fname[MAXPATHLEN];
 116         int i;
 117         struct file_struct *file;
 118         int phase = 0;
 119         extern struct stats stats;
 120         struct stats initial_stats;
 121         extern int write_batch;
 122         extern int read_batch;
 123         int checksums_match;
 124         int buff_len;
 125         char buff[CHUNK_SIZE];
 126         int j;
 127         int done;
 128
 129         if (verbose > 2)
 130                 rprintf(FINFO, "send_files starting\n");
 131
 132         while (1) {
 133                 unsigned int offset;
 134
 135                 i = read_int(f_in);
 136                 if (i == -1) {
 137                         if (phase == 0) {
 138                                 phase++;
 139                                 csum_length = SUM_LENGTH;
 140                                 write_int(f_out, -1);
 141                                 if (verbose > 2)
 142                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 143                                 continue;
 144                         }
 145                         break;
 146                 }
 147
 148                 if (i < 0 || i >= flist->count) {
 149                         rprintf(FERROR, "Invalid file index %d (count=%d)\n",
 150                                 i, flist->count);
 151                         exit_cleanup(RERR_PROTOCOL);
 152                 }
 153
 154                 file = flist->files[i];
 155
 156                 stats.current_file_index = i;
 157                 stats.num_transferred_files++;
 158                 stats.total_transferred_size += file->length;
 159
 160                 if (file->basedir) {
 161                         /* N.B. We're sure that this fits, so offset is OK. */
 162                         offset = strlcpy(fname, file->basedir, sizeof fname);
 163                         if (!offset || fname[offset-1] != '/')
 164                                 fname[offset++] = '/';
 165                 } else
 166                         offset = 0;
 167                 f_name_to(file, fname + offset);
 168
 169                 if (verbose > 2)
 170                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 171
 172                 if (dry_run) {
 173                         if (!am_server && verbose) {
 174                                 rprintf(FINFO, "%s\n", fname+offset);
 175                         }
 176                         write_int(f_out, i);
 177                         continue;
 178                 }
 179
 180                 initial_stats = stats;
 181
 182                 s = receive_sums(f_in);
 183                 if (!s) {
 184                         io_error |= IOERR_GENERAL;
 185                         rprintf(FERROR, "receive_sums failed\n");
 186                         return;
 187                 }
 188
 189                 if (write_batch)
 190                         write_batch_csum_info(&i, s);
 191
 192                 if (!read_batch) {
 193                         fd = do_open(fname, O_RDONLY, 0);
 194                         if (fd == -1) {
 195                                 if (errno == ENOENT) {
 196                                         enum logcode c = am_daemon
 197                                             && protocol_version < 28 ? FERROR
 198                                                                      : FINFO;
 199                                         io_error |= IOERR_VANISHED;
 200                                         rprintf(c, "file has vanished: %s\n",
 201                                                 full_fname(fname));
 202                                 } else {
 203                                         io_error |= IOERR_GENERAL;
 204                                         rsyserr(FERROR, errno,
 205                                                 "send_files failed to open %s",
 206                                                 full_fname(fname));
 207                                 }
 208                                 free_sums(s);
 209                                 continue;
 210                         }
 211
 212                         /* map the local file */
 213                         if (do_fstat(fd, &st) != 0) {
 214                                 io_error |= IOERR_GENERAL;
 215                                 rsyserr(FERROR, errno, "fstat failed");
 216                                 free_sums(s);
 217                                 close(fd);
 218                                 return;
 219                         }
 220
 221                         mbuf = st.st_size ? map_file(fd, st.st_size) : NULL;
 222
 223                         if (verbose > 2) {
 224                                 rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 225                                         fname, (double)st.st_size);
 226                         }
 227
 228                         write_int(f_out, i);
 229
 230                         if (write_batch)
 231                                 write_batch_delta_file((char *)&i, sizeof i);
 232
 233                         write_sum_head(f_out, s);
 234                 }
 235
 236                 if (verbose > 2 && !read_batch)
 237                         rprintf(FINFO, "calling match_sums %s\n", fname);
 238
 239                 if (!am_server && verbose) {
 240                         rprintf(FINFO, "%s\n", fname+offset);
 241                 }
 242
 243                 set_compression(fname);
 244
 245                 if (read_batch) {
 246                         /* read checksums originally computed on sender side */
 247                         read_batch_csum_info(i, s, &checksums_match);
 248                         if (checksums_match) {
 249                                 read_batch_delta_file((char*)&j, sizeof (int));
 250                                 if (j != i) {    /* if flist index entries don't match*/
 251                                         rprintf(FINFO, "index mismatch in send_files\n");
 252                                         rprintf(FINFO, "read index = %d flist ndx = %d\n", j, i);
 253                                         close_batch_delta_file();
 254                                         close_batch_csums_file();
 255                                         exit_cleanup(1);
 256                                 } else {
 257                                         write_int(f_out, j);
 258                                         write_sum_head(f_out, s);
 259                                         done = 0;
 260                                         while (!done) {
 261                                                 read_batch_delta_file((char*)&buff_len, sizeof (int));
 262                                                 write_int(f_out, buff_len);
 263                                                 if (buff_len == 0) {
 264                                                         done = 1;
 265                                                 } else {
 266                                                         if (buff_len > 0) {
 267                                                                 read_batch_delta_file(buff, buff_len);
 268                                                                 write_buf(f_out, buff, buff_len);
 269                                                         }
 270                                                 }
 271                                         }
 272                                         read_batch_delta_file(buff, MD4_SUM_LENGTH);
 273                                         write_buf(f_out, buff, MD4_SUM_LENGTH);
 274
 275                                 }
 276                         } else {  /* not checksum match */
 277                                 rprintf (FINFO, "readbatch & checksums don't match\n");
 278                                 rprintf (FINFO, "filename=%s is being skipped\n", fname);
 279                                 continue;
 280                         }
 281                 } else  { /* not read_batch */
 282                         match_sums(f_out, s, mbuf, st.st_size);
 283                         log_send(file, &initial_stats);
 284                 }
 285
 286                 if (!read_batch) {
 287                         if (mbuf) {
 288                                 j = unmap_file(mbuf);
 289                                 if (j) {
 290                                         io_error |= IOERR_GENERAL;
 291                                         rsyserr(FERROR, j,
 292                                                 "read errors mapping %s",
 293                                                 full_fname(fname));
 294                                 }
 295                         }
 296                         close(fd);
 297                 }
 298
 299                 free_sums(s);
 300
 301                 if (verbose > 2)
 302                         rprintf(FINFO, "sender finished %s\n", fname);
 303         }
 304
 305         if (verbose > 2)
 306                 rprintf(FINFO, "send files finished\n");
 307
 308         match_report();
 309
 310         write_int(f_out, -1);
 311         if (write_batch || read_batch) {
 312                 close_batch_csums_file();
 313                 close_batch_delta_file();
 314         }
 315
 316 }
 317
 318
 319
 320
 321