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