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 log_before_transfer;
  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 do_progress;
  34 extern int inplace;
  35 extern char *log_format;
  36 extern struct stats stats;
  37
  38
  39 /**
  40  * @file
  41  *
  42  * The sender gets checksums from the generator, calculates deltas,
  43  * and transmits them to the receiver.  The sender process runs on the
  44  * machine holding the source files.
  45  **/
  46
  47 /**
  48  * Receive the checksums for a buffer
  49  **/
  50 static struct sum_struct *receive_sums(int f)
  51 {
  52         struct sum_struct *s;
  53         int32 i;
  54         OFF_T offset = 0;
  55
  56         if (!(s = new(struct sum_struct)))
  57                 out_of_memory("receive_sums");
  58
  59         read_sum_head(f, s);
  60
  61         s->sums = NULL;
  62
  63         if (verbose > 3) {
  64                 rprintf(FINFO, "count=%.0f n=%ld rem=%ld\n",
  65                         (double)s->count, (long)s->blength, (long)s->remainder);
  66         }
  67
  68         if (s->count == 0)
  69                 return(s);
  70
  71         if (!(s->sums = new_array(struct sum_buf, s->count)))
  72                 out_of_memory("receive_sums");
  73
  74         for (i = 0; i < s->count; i++) {
  75                 s->sums[i].sum1 = read_int(f);
  76                 read_buf(f, s->sums[i].sum2, s->s2length);
  77
  78                 s->sums[i].offset = offset;
  79                 s->sums[i].flags = 0;
  80
  81                 if (i == s->count-1 && s->remainder != 0)
  82                         s->sums[i].len = s->remainder;
  83                 else
  84                         s->sums[i].len = s->blength;
  85                 offset += s->sums[i].len;
  86
  87                 if (verbose > 3) {
  88                         rprintf(FINFO,
  89                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
  90                                 i, s->sums[i].len, (double)s->sums[i].offset,
  91                                 s->sums[i].sum1);
  92                 }
  93         }
  94
  95         s->flength = offset;
  96
  97         return s;
  98 }
  99
 100
 101
 102 void send_files(struct file_list *flist, int f_out, int f_in)
 103 {
 104         int fd = -1;
 105         struct sum_struct *s;
 106         struct map_struct *mbuf = NULL;
 107         STRUCT_STAT st;
 108         char *fname2, fname[MAXPATHLEN];
 109         int iflags;
 110         struct file_struct *file;
 111         int phase = 0;
 112         struct stats initial_stats;
 113         int save_make_backups = make_backups;
 114         int i, j;
 115
 116         if (verbose > 2)
 117                 rprintf(FINFO, "send_files starting\n");
 118
 119         while (1) {
 120                 unsigned int offset;
 121
 122                 i = read_int(f_in);
 123                 if (i == -1) {
 124                         if (phase == 0) {
 125                                 phase++;
 126                                 csum_length = SUM_LENGTH;
 127                                 write_int(f_out, -1);
 128                                 if (verbose > 2)
 129                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 130                                 /* For inplace: redo phase turns off the backup
 131                                  * flag so that we do a regular inplace send. */
 132                                 make_backups = 0;
 133                                 continue;
 134                         }
 135                         break;
 136                 }
 137
 138                 if (i < 0 || i >= flist->count) {
 139                         rprintf(FERROR, "Invalid file index %d (count=%d)\n",
 140                                 i, flist->count);
 141                         exit_cleanup(RERR_PROTOCOL);
 142                 }
 143
 144                 file = flist->files[i];
 145
 146                 if (protocol_version >= 29) {
 147                         iflags = read_byte(f_in);
 148                         iflags |= read_byte(f_in) << 8;
 149                         if (!(iflags & ITEM_UPDATING) || !S_ISREG(file->mode)) {
 150                                 if (am_server) {
 151                                         write_int(f_out, i);
 152                                         write_byte(f_out, iflags);
 153                                         write_byte(f_out, iflags >> 8);
 154                                 } else
 155                                         log_send(file, &stats, iflags);
 156                                 continue;
 157                         }
 158                 } else
 159                         iflags = ITEM_UPDATING | ITEM_MISSING_DATA;
 160
 161                 if (inplace && protocol_version >= 29) {
 162                         uchar fnamecmp_type = read_byte(f_in);
 163                         updating_basis_file = fnamecmp_type == FNAMECMP_FNAME;
 164                 } else
 165                         updating_basis_file = inplace && !make_backups;
 166
 167                 if (!S_ISREG(file->mode)) {
 168                         rprintf(FERROR, "[%s] got index of non-regular file: %d\n",
 169                                 who_am_i(), i);
 170                         exit_cleanup(RERR_PROTOCOL);
 171                 }
 172
 173                 stats.current_file_index = i;
 174                 stats.num_transferred_files++;
 175                 stats.total_transferred_size += file->length;
 176
 177                 if (file->dir.root) {
 178                         /* N.B. We're sure that this fits, so offset is OK. */
 179                         offset = strlcpy(fname, file->dir.root, sizeof fname);
 180                         if (!offset || fname[offset-1] != '/')
 181                                 fname[offset++] = '/';
 182                 } else
 183                         offset = 0;
 184                 fname2 = f_name_to(file, fname + offset);
 185
 186                 if (verbose > 2)
 187                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 188
 189                 if (dry_run) { /* log the transfer */
 190                         if (!am_server && log_format)
 191                                 log_send(file, &stats, iflags);
 192                         write_int(f_out, i);
 193                         if (protocol_version >= 29) {
 194                                 write_byte(f_out, iflags);
 195                                 write_byte(f_out, iflags >> 8);
 196                         }
 197                         continue;
 198                 }
 199
 200                 initial_stats = stats;
 201
 202                 if (!(s = receive_sums(f_in))) {
 203                         io_error |= IOERR_GENERAL;
 204                         rprintf(FERROR, "receive_sums failed\n");
 205                         return;
 206                 }
 207
 208                 fd = do_open(fname, O_RDONLY, 0);
 209                 if (fd == -1) {
 210                         if (errno == ENOENT) {
 211                                 enum logcode c = am_daemon
 212                                     && protocol_version < 28 ? FERROR
 213                                                              : FINFO;
 214                                 io_error |= IOERR_VANISHED;
 215                                 rprintf(c, "file has vanished: %s\n",
 216                                         full_fname(fname));
 217                         } else {
 218                                 io_error |= IOERR_GENERAL;
 219                                 rsyserr(FERROR, errno,
 220                                         "send_files failed to open %s",
 221                                         full_fname(fname));
 222                         }
 223                         free_sums(s);
 224                         continue;
 225                 }
 226
 227                 /* map the local file */
 228                 if (do_fstat(fd, &st) != 0) {
 229                         io_error |= IOERR_GENERAL;
 230                         rsyserr(FERROR, errno, "fstat failed");
 231                         free_sums(s);
 232                         close(fd);
 233                         return;
 234                 }
 235
 236                 if (st.st_size) {
 237                         int32 read_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 238                         mbuf = map_file(fd, st.st_size, read_size, s->blength);
 239                 } else
 240                         mbuf = NULL;
 241
 242                 if (verbose > 2) {
 243                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 244                                 safe_fname(fname), (double)st.st_size);
 245                 }
 246
 247                 write_int(f_out, i);
 248                 if (protocol_version >= 29) {
 249                         write_byte(f_out, iflags);
 250                         write_byte(f_out, iflags >> 8);
 251                 }
 252                 write_sum_head(f_out, s);
 253
 254                 if (verbose > 2) {
 255                         rprintf(FINFO, "calling match_sums %s\n",
 256                                 safe_fname(fname));
 257                 }
 258
 259                 if (log_before_transfer)
 260                         log_send(file, &initial_stats, iflags);
 261                 else if (!am_server && verbose && do_progress)
 262                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 263
 264                 set_compression(fname);
 265
 266                 match_sums(f_out, s, mbuf, st.st_size);
 267                 if (!log_before_transfer)
 268                         log_send(file, &initial_stats, iflags);
 269
 270                 if (mbuf) {
 271                         j = unmap_file(mbuf);
 272                         if (j) {
 273                                 io_error |= IOERR_GENERAL;
 274                                 rsyserr(FERROR, j,
 275                                         "read errors mapping %s",
 276                                         full_fname(fname));
 277                         }
 278                 }
 279                 close(fd);
 280
 281                 free_sums(s);
 282
 283                 if (verbose > 2) {
 284                         rprintf(FINFO, "sender finished %s\n",
 285                                 safe_fname(fname));
 286                 }
 287         }
 288         make_backups = save_make_backups;
 289
 290         if (verbose > 2)
 291                 rprintf(FINFO, "send files finished\n");
 292
 293         match_report();
 294
 295         write_int(f_out, -1);
 296 }