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         int j;
 122
 123         if (verbose > 2)
 124                 rprintf(FINFO, "send_files starting\n");
 125
 126         while (1) {
 127                 unsigned int offset;
 128
 129                 i = read_int(f_in);
 130                 if (i == -1) {
 131                         if (phase == 0) {
 132                                 phase++;
 133                                 csum_length = SUM_LENGTH;
 134                                 write_int(f_out, -1);
 135                                 if (verbose > 2)
 136                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 137                                 continue;
 138                         }
 139                         break;
 140                 }
 141
 142                 if (i < 0 || i >= flist->count) {
 143                         rprintf(FERROR, "Invalid file index %d (count=%d)\n",
 144                                 i, flist->count);
 145                         exit_cleanup(RERR_PROTOCOL);
 146                 }
 147
 148                 file = flist->files[i];
 149
 150                 stats.current_file_index = i;
 151                 stats.num_transferred_files++;
 152                 stats.total_transferred_size += file->length;
 153
 154                 if (file->basedir) {
 155                         /* N.B. We're sure that this fits, so offset is OK. */
 156                         offset = strlcpy(fname, file->basedir, sizeof fname);
 157                         if (!offset || fname[offset-1] != '/')
 158                                 fname[offset++] = '/';
 159                 } else
 160                         offset = 0;
 161                 f_name_to(file, fname + offset);
 162
 163                 if (verbose > 2)
 164                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 165
 166                 if (dry_run) {
 167                         if (!am_server && verbose) {
 168                                 rprintf(FINFO, "%s\n", fname+offset);
 169                         }
 170                         write_int(f_out, i);
 171                         continue;
 172                 }
 173
 174                 initial_stats = stats;
 175
 176                 s = receive_sums(f_in);
 177                 if (!s) {
 178                         io_error |= IOERR_GENERAL;
 179                         rprintf(FERROR, "receive_sums failed\n");
 180                         return;
 181                 }
 182
 183                 fd = do_open(fname, O_RDONLY, 0);
 184                 if (fd == -1) {
 185                         if (errno == ENOENT) {
 186                                 enum logcode c = am_daemon
 187                                     && protocol_version < 28 ? FERROR
 188                                                              : FINFO;
 189                                 io_error |= IOERR_VANISHED;
 190                                 rprintf(c, "file has vanished: %s\n",
 191                                         full_fname(fname));
 192                         } else {
 193                                 io_error |= IOERR_GENERAL;
 194                                 rsyserr(FERROR, errno,
 195                                         "send_files failed to open %s",
 196                                         full_fname(fname));
 197                         }
 198                         free_sums(s);
 199                         continue;
 200                 }
 201
 202                 /* map the local file */
 203                 if (do_fstat(fd, &st) != 0) {
 204                         io_error |= IOERR_GENERAL;
 205                         rsyserr(FERROR, errno, "fstat failed");
 206                         free_sums(s);
 207                         close(fd);
 208                         return;
 209                 }
 210
 211                 mbuf = st.st_size ? map_file(fd, st.st_size) : NULL;
 212
 213                 if (verbose > 2) {
 214                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 215                                 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", fname);
 223
 224                 if (!am_server && verbose) {
 225                         rprintf(FINFO, "%s\n", fname+offset);
 226                 }
 227
 228                 set_compression(fname);
 229
 230                 match_sums(f_out, s, mbuf, st.st_size);
 231                 log_send(file, &initial_stats);
 232
 233                 if (mbuf) {
 234                         j = unmap_file(mbuf);
 235                         if (j) {
 236                                 io_error |= IOERR_GENERAL;
 237                                 rsyserr(FERROR, j,
 238                                         "read errors mapping %s",
 239                                         full_fname(fname));
 240                         }
 241                 }
 242                 close(fd);
 243
 244                 free_sums(s);
 245
 246                 if (verbose > 2)
 247                         rprintf(FINFO, "sender finished %s\n", fname);
 248         }
 249
 250         if (verbose > 2)
 251                 rprintf(FINFO, "send files finished\n");
 252
 253         match_report();
 254
 255         write_int(f_out, -1);
 256 }