| 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 != file->mode) { |
| 207 | updated = 1; |
| 208 | if (do_chmod(fname,file->mode) != 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 | rprintf(FINFO,"\nrsync.c:sig_int() called.\n"); |
| 230 | exit_cleanup(RERR_SIGNAL); |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* finish off a file transfer, renaming the file and setting the permissions |
| 235 | and ownership */ |
| 236 | void finish_transfer(char *fname, char *fnametmp, struct file_struct *file) |
| 237 | { |
| 238 | if (make_backups && !make_backup(fname)) |
| 239 | return; |
| 240 | |
| 241 | /* move tmp file over real file */ |
| 242 | if (robust_rename(fnametmp,fname) != 0) { |
| 243 | if (errno == EXDEV) { |
| 244 | /* rename failed on cross-filesystem link. |
| 245 | Copy the file instead. */ |
| 246 | if (copy_file(fnametmp,fname, file->mode & INITACCESSPERMS)) { |
| 247 | rprintf(FERROR,"copy %s -> %s : %s\n", |
| 248 | fnametmp,fname,strerror(errno)); |
| 249 | } else { |
| 250 | set_perms(fname,file,NULL,0); |
| 251 | } |
| 252 | } else { |
| 253 | rprintf(FERROR,"rename %s -> %s : %s\n", |
| 254 | fnametmp,fname,strerror(errno)); |
| 255 | } |
| 256 | do_unlink(fnametmp); |
| 257 | } else { |
| 258 | set_perms(fname,file,NULL,0); |
| 259 | } |
| 260 | } |