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 preserve_times;
  28 extern int am_root;
  29 extern int preserve_uid;
  30 extern int preserve_gid;
  31 extern int preserve_perms;
  32 extern int make_backups;
  33
  34
  35 /*
  36   free a sums struct
  37   */
  38 void free_sums(struct sum_struct *s)
  39 {
  40         if (s->sums) free(s->sums);
  41         free(s);
  42 }
  43
  44
  45 /*
  46  * delete a file or directory. If force_delete is set then delete
  47  * recursively
  48  */
  49 int delete_file(char *fname)
  50 {
  51         DIR *d;
  52         struct dirent *di;
  53         char buf[MAXPATHLEN];
  54         extern int force_delete;
  55         STRUCT_STAT st;
  56         int ret;
  57         extern int recurse;
  58
  59 #if SUPPORT_LINKS
  60         ret = do_lstat(fname, &st);
  61 #else
  62         ret = do_stat(fname, &st);
  63 #endif
  64         if (ret) {
  65                 return -1;
  66         }
  67
  68         if (!S_ISDIR(st.st_mode)) {
  69                 if (robust_unlink(fname) == 0 || errno == ENOENT) return 0;
  70                 rprintf(FERROR,"delete_file: unlink(%s) : %s\n", fname, strerror(errno));
  71                 return -1;
  72         }
  73
  74         if (do_rmdir(fname) == 0 || errno == ENOENT) return 0;
  75         if (!force_delete || !recurse ||
  76             (errno != ENOTEMPTY && errno != EEXIST)) {
  77                 rprintf(FERROR,"delete_file: rmdir(%s) : %s\n", fname, strerror(errno));
  78                 return -1;
  79         }
  80
  81         /* now we do a recsursive delete on the directory ... */
  82         d = opendir(fname);
  83         if (!d) {
  84                 rprintf(FERROR,"delete_file: opendir(%s): %s\n",
  85                         fname,strerror(errno));
  86                 return -1;
  87         }
  88
  89         for (di=readdir(d); di; di=readdir(d)) {
  90                 char *dname = d_name(di);
  91                 if (strcmp(dname,".")==0 ||
  92                     strcmp(dname,"..")==0)
  93                         continue;
  94                 snprintf(buf, sizeof(buf), "%s/%s", fname, dname);
  95                 if (verbose > 0)
  96                         rprintf(FINFO,"deleting %s\n", buf);
  97                 if (delete_file(buf) != 0) {
  98                         closedir(d);
  99                         return -1;
 100                 }
 101         }
 102
 103         closedir(d);
 104
 105         if (do_rmdir(fname) != 0) {
 106                 rprintf(FERROR,"delete_file: rmdir(%s) : %s\n", fname, strerror(errno));
 107                 return -1;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static int is_in_group(gid_t gid)
 114 {
 115 #ifdef GETGROUPS_T
 116         static gid_t last_in = (gid_t) -2, last_out;
 117         static int ngroups = -2;
 118         static GETGROUPS_T *gidset;
 119         int n;
 120
 121         if (gid == last_in)
 122                 return last_out;
 123         if (ngroups < -1) {
 124                 /* treat failure (-1) as if not member of any group */
 125                 ngroups = getgroups(0, 0);
 126                 if (ngroups > 0) {
 127                         gidset = (GETGROUPS_T *) malloc(ngroups * sizeof(GETGROUPS_T));
 128                         ngroups = getgroups(ngroups, gidset);
 129                 }
 130         }
 131
 132         last_in = gid;
 133         last_out = 0;
 134         for (n = 0; n < ngroups; n++) {
 135                 if (gidset[n] == gid) {
 136                         last_out = 1;
 137                         break;
 138                 }
 139         }
 140         return last_out;
 141
 142 #else
 143         return 0;
 144 #endif
 145 }
 146
 147 int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
 148               int report)
 149 {
 150         int updated = 0;
 151         STRUCT_STAT st2;
 152         int change_uid, change_gid;
 153
 154         if (dry_run) return 0;
 155
 156         if (!st) {
 157                 if (link_stat(fname,&st2) != 0) {
 158                         rprintf(FERROR,"stat %s : %s\n",fname,strerror(errno));
 159                         return 0;
 160                 }
 161                 st = &st2;
 162         }
 163
 164         if (preserve_times && !S_ISLNK(st->st_mode) &&
 165             cmp_modtime(st->st_mtime, file->modtime) != 0) {
 166                 /* don't complain about not setting times on directories
 167                    because some filesystems can't do it */
 168                 if (set_modtime(fname,file->modtime) != 0 &&
 169                     !S_ISDIR(st->st_mode)) {
 170                         rprintf(FERROR,"failed to set times on %s : %s\n",
 171                                 fname,strerror(errno));
 172                         return 0;
 173                 } else {
 174                         updated = 1;
 175                 }
 176         }
 177
 178         change_uid = am_root && preserve_uid && st->st_uid != file->uid;
 179         change_gid = preserve_gid && file->gid != (gid_t) -1 && \
 180                                 st->st_gid != file->gid;
 181         if (change_gid && !am_root) {
 182                 /* enforce bsd-style group semantics: non-root can only
 183                     change to groups that the user is a member of */
 184                 change_gid = is_in_group(file->gid);
 185         }
 186         if (change_uid || change_gid) {
 187                 if (do_lchown(fname,
 188                               change_uid?file->uid:st->st_uid,
 189                               change_gid?file->gid:st->st_gid) != 0) {
 190                         /* shouldn't have attempted to change uid or gid
 191                              unless have the privilege */
 192                         rprintf(FERROR,"chown %s : %s\n", fname,strerror(errno));
 193                         return 0;
 194                 }
 195                 /* a lchown had been done - we have to re-stat if the
 196                    destination had the setuid or setgid bits set due
 197                    to the side effect of the chown call */
 198                 if (st->st_mode & (S_ISUID | S_ISGID)) {
 199                         link_stat(fname, st);
 200                 }
 201                 updated = 1;
 202         }
 203
 204 #ifdef HAVE_CHMOD
 205         if (!S_ISLNK(st->st_mode)) {
 206                 if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) {
 207                         updated = 1;
 208                         if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) {
 209                                 rprintf(FERROR,"failed to set permissions on %s : %s\n",
 210                                         fname,strerror(errno));
 211                                 return 0;
 212                         }
 213                 }
 214         }
 215 #endif
 216
 217         if (verbose > 1 && report) {
 218                 if (updated)
 219                         rprintf(FINFO,"%s\n",fname);
 220                 else
 221                         rprintf(FINFO,"%s is uptodate\n",fname);
 222         }
 223         return updated;
 224 }
 225
 226
 227 void sig_int(void)
 228 {
 229         exit_cleanup(RERR_SIGNAL);
 230 }
 231
 232
 233 /* finish off a file transfer, renaming the file and setting the permissions
 234    and ownership */
 235 void finish_transfer(char *fname, char *fnametmp, struct file_struct *file)
 236 {
 237         if (make_backups && !make_backup(fname))
 238                 return;
 239
 240         /* move tmp file over real file */
 241         if (robust_rename(fnametmp,fname) != 0) {
 242                 if (errno == EXDEV) {
 243                         /* rename failed on cross-filesystem link.
 244                            Copy the file instead. */
 245                         if (copy_file(fnametmp,fname, file->mode & INITACCESSPERMS)) {
 246                                 rprintf(FERROR,"copy %s -> %s : %s\n",
 247                                         fnametmp,fname,strerror(errno));
 248                         } else {
 249                                 set_perms(fname,file,NULL,0);
 250                         }
 251                 } else {
 252                         rprintf(FERROR,"rename %s -> %s : %s\n",
 253                                 fnametmp,fname,strerror(errno));
 254                 }
 255                 do_unlink(fnametmp);
 256         } else {
 257                 set_perms(fname,file,NULL,0);
 258         }
 259 }