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 struct stats stats;
  31
  32
  33 /**
  34  * @file
  35  *
  36  * The sender gets checksums from the generator, calculates deltas,
  37  * and transmits them to the receiver.  The sender process runs on the
  38  * machine holding the source files.
  39  **/
  40 void read_sum_head(int f, struct sum_struct *sum)
  41 {
  42         sum->count = read_int(f);
  43         sum->blength = read_int(f);
  44         if (protocol_version < 27) {
  45                 sum->s2length = csum_length;
  46         } else {
  47                 sum->s2length = read_int(f);
  48                 if (sum->s2length > MD4_SUM_LENGTH) {
  49                         rprintf(FERROR, "Invalid checksum length %ld\n",
  50                             (long)sum->s2length);
  51                         exit_cleanup(RERR_PROTOCOL);
  52                 }
  53         }
  54         sum->remainder = read_int(f);
  55 }
  56
  57 /**
  58  * Receive the checksums for a buffer
  59  **/
  60 static struct sum_struct *receive_sums(int f)
  61 {
  62         struct sum_struct *s;
  63         int i;
  64         OFF_T offset = 0;
  65
  66         if (!(s = new(struct sum_struct)))
  67                 out_of_memory("receive_sums");
  68
  69         read_sum_head(f, s);
  70
  71         s->sums = NULL;
  72
  73         if (verbose > 3) {
  74                 rprintf(FINFO, "count=%ld n=%u rem=%u\n",
  75                         (long)s->count, s->blength, s->remainder);
  76         }
  77
  78         if (s->count == 0)
  79                 return(s);
  80
  81         if (!(s->sums = new_array(struct sum_buf, s->count)))
  82                 out_of_memory("receive_sums");
  83
  84         for (i = 0; i < (int)s->count; i++) {
  85                 s->sums[i].sum1 = read_int(f);
  86                 read_buf(f, s->sums[i].sum2, s->s2length);
  87
  88                 s->sums[i].offset = offset;
  89                 s->sums[i].flags = 0;
  90
  91                 if (i == (int)s->count-1 && s->remainder != 0)
  92                         s->sums[i].len = s->remainder;
  93                 else
  94                         s->sums[i].len = s->blength;
  95                 offset += s->sums[i].len;
  96
  97                 if (verbose > 3) {
  98                         rprintf(FINFO,
  99                                 "chunk[%d] len=%d offset=%.0f sum1=%08x\n",
 100                                 i, s->sums[i].len, (double)s->sums[i].offset,
 101                                 s->sums[i].sum1);
 102                 }
 103         }
 104
 105         s->flength = offset;
 106
 107         return s;
 108 }
 109
 110
 111
 112 void send_files(struct file_list *flist, int f_out, int f_in)
 113 {
 114         int fd = -1;
 115         struct sum_struct *s;
 116         struct map_struct *mbuf = NULL;
 117         STRUCT_STAT st;
 118         char fname[MAXPATHLEN];
 119         int i;
 120         struct file_struct *file;
 121         int phase = 0;
 122         struct stats initial_stats;
 123         int j;
 124
 125         if (verbose > 2)
 126                 rprintf(FINFO, "send_files starting\n");
 127
 128         while (1) {
 129                 unsigned int offset;
 130
 131                 i = read_int(f_in);
 132                 if (i == -1) {
 133                         if (phase == 0) {
 134                                 phase++;
 135                                 csum_length = SUM_LENGTH;
 136                                 write_int(f_out, -1);
 137                                 if (verbose > 2)
 138                                         rprintf(FINFO, "send_files phase=%d\n", phase);
 139                                 continue;
 140                         }
 141                         break;
 142                 }
 143
 144                 if (i < 0 || i >= flist->count) {
 145                         rprintf(FERROR, "Invalid file index %d (count=%d)\n",
 146                                 i, flist->count);
 147                         exit_cleanup(RERR_PROTOCOL);
 148                 }
 149
 150                 file = flist->files[i];
 151
 152                 stats.current_file_index = i;
 153                 stats.num_transferred_files++;
 154                 stats.total_transferred_size += file->length;
 155
 156                 if (file->basedir) {
 157                         /* N.B. We're sure that this fits, so offset is OK. */
 158                         offset = strlcpy(fname, file->basedir, sizeof fname);
 159                         if (!offset || fname[offset-1] != '/')
 160                                 fname[offset++] = '/';
 161                 } else
 162                         offset = 0;
 163                 f_name_to(file, fname + offset);
 164
 165                 if (verbose > 2)
 166                         rprintf(FINFO, "send_files(%d, %s)\n", i, fname);
 167
 168                 if (dry_run) {
 169                         if (!am_server && verbose) {
 170                                 rprintf(FINFO, "%s\n", fname+offset);
 171                         }
 172                         write_int(f_out, i);
 173                         continue;
 174                 }
 175
 176                 initial_stats = stats;
 177
 178                 if (!(s = receive_sums(f_in))) {
 179                         io_error |= IOERR_GENERAL;
 180                         rprintf(FERROR, "receive_sums failed\n");
 181                         return;
 182                 }
 183
 184                 fd = do_open(fname, O_RDONLY, 0);
 185                 if (fd == -1) {
 186                         if (errno == ENOENT) {
 187                                 enum logcode c = am_daemon
 188                                     && protocol_version < 28 ? FERROR
 189                                                              : FINFO;
 190                                 io_error |= IOERR_VANISHED;
 191                                 rprintf(c, "file has vanished: %s\n",
 192                                         full_fname(fname));
 193                         } else {
 194                                 io_error |= IOERR_GENERAL;
 195                                 rsyserr(FERROR, errno,
 196                                         "send_files failed to open %s",
 197                                         full_fname(fname));
 198                         }
 199                         free_sums(s);
 200                         continue;
 201                 }
 202
 203                 /* map the local file */
 204                 if (do_fstat(fd, &st) != 0) {
 205                         io_error |= IOERR_GENERAL;
 206                         rsyserr(FERROR, errno, "fstat failed");
 207                         free_sums(s);
 208                         close(fd);
 209                         return;
 210                 }
 211
 212                 mbuf = st.st_size ? map_file(fd, st.st_size, s->blength) : NULL;
 213
 214                 if (verbose > 2) {
 215                         rprintf(FINFO, "send_files mapped %s of size %.0f\n",
 216                                 fname, (double)st.st_size);
 217                 }
 218
 219                 write_int(f_out, i);
 220                 write_sum_head(f_out, s);
 221
 222                 if (verbose > 2)
 223                         rprintf(FINFO, "calling match_sums %s\n", fname);
 224
 225                 if (!am_server && verbose) {
 226                         rprintf(FINFO, "%s\n", fname+offset);
 227                 }
 228
 229                 set_compression(fname);
 230
 231                 match_sums(f_out, s, mbuf, st.st_size);
 232                 log_send(file, &initial_stats);
 233
 234                 if (mbuf) {
 235                         j = unmap_file(mbuf);
 236                         if (j) {
 237                                 io_error |= IOERR_GENERAL;
 238                                 rsyserr(FERROR, j,
 239                                         "read errors mapping %s",
 240                                         full_fname(fname));
 241                         }
 242                 }
 243                 close(fd);
 244
 245                 free_sums(s);
 246
 247                 if (verbose > 2)
 248                         rprintf(FINFO, "sender finished %s\n", fname);
 249         }
 250
 251         if (verbose > 2)
 252                 rprintf(FINFO, "send files finished\n");
 253
 254         match_report();
 255
 256         write_int(f_out, -1);
 257 }