rsync.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 /* this file contains code used by more than one part of the rsync
  21    process */
  22
  23 #include "rsync.h"
  24
  25 extern int verbose;
  26 extern int dry_run;
  27 extern int daemon_log_format_has_i;
  28 extern int preserve_times;
  29 extern int omit_dir_times;
  30 extern int am_root;
  31 extern int am_server;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int am_starting_up;
  35 extern int preserve_uid;
  36 extern int preserve_gid;
  37 extern int inplace;
  38 extern int keep_dirlinks;
  39 extern int make_backups;
  40 extern struct stats stats;
  41
  42
  43 /*
  44   free a sums struct
  45   */
  46 void free_sums(struct sum_struct *s)
  47 {
  48         if (s->sums) free(s->sums);
  49         free(s);
  50 }
  51
  52
  53 int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
  54               int flags)
  55 {
  56         int updated = 0;
  57         STRUCT_STAT st2;
  58         int change_uid, change_gid;
  59
  60         if (!st) {
  61                 if (dry_run)
  62                         return 1;
  63                 if (link_stat(fname, &st2, 0) < 0) {
  64                         rsyserr(FERROR, errno, "stat %s failed",
  65                                 full_fname(fname));
  66                         return 0;
  67                 }
  68                 st = &st2;
  69         }
  70
  71         if (!preserve_times || S_ISLNK(st->st_mode)
  72          || (S_ISDIR(st->st_mode) && omit_dir_times))
  73                 flags |= PERMS_SKIP_MTIME;
  74         if (!(flags & PERMS_SKIP_MTIME)
  75             && cmp_modtime(st->st_mtime, file->modtime) != 0) {
  76                 if (set_modtime(fname,file->modtime) != 0) {
  77                         rsyserr(FERROR, errno, "failed to set times on %s",
  78                                 full_fname(fname));
  79                         return 0;
  80                 }
  81                 updated = 1;
  82         }
  83
  84         change_uid = am_root && preserve_uid && st->st_uid != file->uid;
  85         change_gid = preserve_gid && file->gid != GID_NONE
  86                 && st->st_gid != file->gid;
  87 #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
  88         if (S_ISLNK(st->st_mode))
  89                 ;
  90         else
  91 #endif
  92         if (change_uid || change_gid) {
  93                 if (verbose > 2) {
  94                         if (change_uid) {
  95                                 rprintf(FINFO,
  96                                         "set uid of %s from %ld to %ld\n",
  97                                         safe_fname(fname),
  98                                         (long)st->st_uid, (long)file->uid);
  99                         }
 100                         if (change_gid) {
 101                                 rprintf(FINFO,
 102                                         "set gid of %s from %ld to %ld\n",
 103                                         safe_fname(fname),
 104                                         (long)st->st_gid, (long)file->gid);
 105                         }
 106                 }
 107                 if (do_lchown(fname,
 108                     change_uid ? file->uid : st->st_uid,
 109                     change_gid ? file->gid : st->st_gid) != 0) {
 110                         /* shouldn't have attempted to change uid or gid
 111                          * unless have the privilege */
 112                         rsyserr(FERROR, errno, "%s %s failed",
 113                             change_uid ? "chown" : "chgrp",
 114                             full_fname(fname));
 115                         return 0;
 116                 }
 117                 /* a lchown had been done - we have to re-stat if the
 118                  * destination had the setuid or setgid bits set due
 119                  * to the side effect of the chown call */
 120                 if (st->st_mode & (S_ISUID | S_ISGID)) {
 121                         link_stat(fname, st,
 122                                   keep_dirlinks && S_ISDIR(st->st_mode));
 123                 }
 124                 updated = 1;
 125         }
 126
 127 #ifdef HAVE_CHMOD
 128         if (!S_ISLNK(st->st_mode)) {
 129                 if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) {
 130                         updated = 1;
 131                         if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) {
 132                                 rsyserr(FERROR, errno, "failed to set permissions on %s",
 133                                         full_fname(fname));
 134                                 return 0;
 135                         }
 136                 }
 137         }
 138 #endif
 139
 140         if (verbose > 1 && flags & PERMS_REPORT) {
 141                 enum logcode code = daemon_log_format_has_i || dry_run
 142                                   ? FCLIENT : FINFO;
 143                 if (updated)
 144                         rprintf(code, "%s\n", safe_fname(fname));
 145                 else
 146                         rprintf(code, "%s is uptodate\n", safe_fname(fname));
 147         }
 148         return updated;
 149 }
 150
 151
 152 void sig_int(void)
 153 {
 154         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 155          * for a password, then our cleanup's sending of a SIGUSR1
 156          * signal to all our children may kill ssh before it has a
 157          * chance to restore the tty settings (i.e. turn echo back
 158          * on).  By sleeping for a short time, ssh gets a bigger
 159          * chance to do the right thing.  If child processes are
 160          * not ssh waiting for a password, then this tiny delay
 161          * shouldn't hurt anything. */
 162         msleep(400);
 163         exit_cleanup(RERR_SIGNAL);
 164 }
 165
 166
 167 /* finish off a file transfer, renaming the file and setting the permissions
 168    and ownership */
 169 void finish_transfer(char *fname, char *fnametmp, struct file_struct *file,
 170                      int ok_to_set_time, int overwriting_basis)
 171 {
 172         int ret;
 173
 174         if (inplace) {
 175                 if (verbose > 2)
 176                         rprintf(FINFO, "finishing %s\n", safe_fname(fname));
 177                 goto do_set_perms;
 178         }
 179
 180         if (make_backups && overwriting_basis && !make_backup(fname))
 181                 return;
 182
 183         /* Change permissions before putting the file into place. */
 184         set_perms(fnametmp, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME);
 185
 186         /* move tmp file over real file */
 187         if (verbose > 2) {
 188                 rprintf(FINFO, "renaming %s to %s\n",
 189                         safe_fname(fnametmp), safe_fname(fname));
 190         }
 191         ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS);
 192         if (ret < 0) {
 193                 rsyserr(FERROR, errno, "%s %s -> \"%s\"",
 194                     ret == -2 ? "copy" : "rename",
 195                     full_fname(fnametmp), safe_fname(fname));
 196                 do_unlink(fnametmp);
 197                 return;
 198         }
 199         if (ret == 0) {
 200                 /* The file was moved into place (not copied), so it's done. */
 201                 return;
 202         }
 203     do_set_perms:
 204         set_perms(fname, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME);
 205 }
 206
 207 const char *who_am_i(void)
 208 {
 209         if (am_starting_up)
 210                 return am_server ? "server" : "client";
 211         return am_sender ? "sender" : am_generator ? "generator" : "receiver";
 212 }