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 void read_sum_head(int f, struct sum_struct *sum)
  42 {
  43         sum->count = read_int(f);
  44         sum->blength = read_int(f);
  45         if (protocol_version < 27) {
  46                 sum->s2length = csum_length;
  47         } else {
  48                 sum->s2length = read_int(f);
  49                 if (sum->s2length > MD4_SUM_LENGTH) {
  50                         rprintf(FERROR, "Invalid checksum length %ld\n",
  51                             (long)sum->s2length);
  52                         exit_cleanup(RERR_PROTOCOL);
  53                 }
  54         }
  55         sum->remainder = read_int(f);
  56 }
  57
  58 /**
  59  * Receive the checksums for a buffer
  60  **/
  61 static struct sum_struct *receive_sums(int f)
  62 {
  63         struct sum_struct *s;
  64         int i;
  65         OFF_T offset = 0;
  66
  67         if (!(s = new(struct sum_struct)))
  68                 out_of_memory("receive_sums");
  69
  70         read_sum_head(f, s);
  71
  72         s->sums = NULL;
  73
  74         if (verbose > 3) {
  75                 rprintf(FINFO, "count=%ld n=%u rem=%u\n",
  76                         (long)s->count, s->blength, s->remainder);
  77         }
  78
  79         if (s->count == 0)
  80                 return(s);
  81
  82         if (!(s->sums = new_array(struct sum_buf, s->count)))
  83                 out_of_memory("receive_sums");
  84
  85         for (i = 0; i < (int)s->count; i++) {
  86                 s->sums[i].sum1 = read_int(f);
  87                 read_buf(f, s->sums[i].sum2, s->s2length);
  88
  89                 s->sums[i].offset = offset;
  90                 s->sums[i].flags = 0;
  91
  92                 if (i == (int)s->count-1 && s->remainder != 0)
  93                         s->sums[i].len = s->remainder;
  94                 else
  95                         s->sums[i].len = s->blength;
  96                 offset += s->sums[i].len;
  97
  98                 if (verbose > 3) {
  99                         rprintf(FINFO,
 100                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
 101                                 i, s->sums[i].len, (double)s->sums[i].offset,
 102                                 s->sums[i].sum1);
 103                 }
 104         }
 105
 106         s->flength = offset;
 107
 108         return s;
 109 }
 110
 111
 112
 113 void send_files(struct file_list *flist, int f_out, int f_in)
 114 {
 115         int fd = -1;
 116         struct sum_struct *s;
 117         struct map_struct *mbuf = NULL;
 118         STRUCT_STAT st;
 119         char *fname2, fname[MAXPATHLEN];
 120         int i;
 121         struct file_struct *file;
 122         int phase = 0;
 123         struct stats initial_stats;
 124         int save_make_backups = make_backups;
 125         int j;
 126
 127         if (verbose > 2)
 128                 rprintf(FINFO, "send_files starting\n");
 129
 130         while (1) {
 131                 unsigned int offset;
 132
 133                 i = read_int(f_in);
 134                 if (i == -1) {
 135                         if (phase == 0) {
 136                                 phase++;
 137                                 csum_length = SUM_LENGTH;
 138                                 write_int(f_out, -1);
 139                                 if (verbose > 2)
 140                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 141                                 /* inplace resends run without a backup file */
 142                                 make_backups = 0;
 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                 fname2 = 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) /* log the transfer */
 174                                 rprintf(FINFO, "%s\n", safe_fname(fname2));
 175                         write_int(f_out, i);
 176                         continue;
 177                 }
 178
 179                 initial_stats = stats;
 180
 181                 if (!(s = receive_sums(f_in))) {
 182                         io_error |= IOERR_GENERAL;
 183                         rprintf(FERROR, "receive_sums failed\n");
 184                         return;
 185                 }
 186
 187                 fd = do_open(fname, O_RDONLY, 0);
 188                 if (fd == -1) {
 189                         if (errno == ENOENT) {
 190                                 enum logcode c = am_daemon
 191                                     && protocol_version < 28 ? FERROR
 192                                                              : FINFO;
 193                                 io_error |= IOERR_VANISHED;
 194                                 rprintf(c, "file has vanished: %s\n",
 195                                         full_fname(fname));
 196                         } else {
 197                                 io_error |= IOERR_GENERAL;
 198                                 rsyserr(FERROR, errno,
 199                                         "send_files failed to open %s",
 200                                         full_fname(fname));
 201                         }
 202                         free_sums(s);
 203                         continue;
 204                 }
 205
 206                 /* map the local file */
 207                 if (do_fstat(fd, &st) != 0) {
 208                         io_error |= IOERR_GENERAL;
 209                         rsyserr(FERROR, errno, "fstat failed");
 210                         free_sums(s);
 211                         close(fd);
 212                         return;
 213                 }
 214
 215                 if (st.st_size) {
 216                         OFF_T map_size = MAX(s->blength * 3, MAX_MAP_SIZE);
 217                         mbuf = map_file(fd, st.st_size, map_size, s->blength);
 218                 } else
 219                         mbuf = NULL;
 220
 221                 if (verbose > 2) {
 222                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 223                                 safe_fname(fname), (double)st.st_size);
 224                 }
 225
 226                 write_int(f_out, i);
 227                 write_sum_head(f_out, s);
 228
 229                 if (verbose > 2) {
 230                         rprintf(FINFO, "calling match_sums %s\n",
 231                                 safe_fname(fname));
 232                 }
 233
 234                 if (!am_server && verbose) /* log the transfer */
 235                         rprintf(FINFO, "%s\n", safe_fname(fname2));
 236
 237                 set_compression(fname);
 238
 239                 match_sums(f_out, s, mbuf, st.st_size);
 240                 log_send(file, &initial_stats);
 241
 242                 if (mbuf) {
 243                         j = unmap_file(mbuf);
 244                         if (j) {
 245                                 io_error |= IOERR_GENERAL;
 246                                 rsyserr(FERROR, j,
 247                                         "read errors mapping %s",
 248                                         full_fname(fname));
 249                         }
 250                 }
 251                 close(fd);
 252
 253                 free_sums(s);
 254
 255                 if (verbose > 2) {
 256                         rprintf(FINFO, "sender finished %s\n",
 257                                 safe_fname(fname));
 258                 }
 259         }
 260         make_backups = save_make_backups;
 261
 262         if (verbose > 2)
 263                 rprintf(FINFO, "send files finished\n");
 264
 265         match_report();
 266
 267         write_int(f_out, -1);
 268 }