| 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 am_sender; |
| 30 | extern int am_generator; |
| 31 | extern int preserve_uid; |
| 32 | extern int preserve_gid; |
| 33 | extern int force_delete; |
| 34 | extern int recurse; |
| 35 | extern int keep_dirlinks; |
| 36 | extern int make_backups; |
| 37 | extern char *backup_dir; |
| 38 | extern int inplace; |
| 39 | |
| 40 | |
| 41 | /* |
| 42 | free a sums struct |
| 43 | */ |
| 44 | void free_sums(struct sum_struct *s) |
| 45 | { |
| 46 | if (s->sums) free(s->sums); |
| 47 | free(s); |
| 48 | } |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | * delete a file or directory. If force_delete is set then delete |
| 53 | * recursively |
| 54 | */ |
| 55 | int delete_file(char *fname) |
| 56 | { |
| 57 | DIR *d; |
| 58 | struct dirent *di; |
| 59 | char buf[MAXPATHLEN]; |
| 60 | STRUCT_STAT st; |
| 61 | int ret; |
| 62 | |
| 63 | #if SUPPORT_LINKS |
| 64 | ret = do_lstat(fname, &st); |
| 65 | #else |
| 66 | ret = do_stat(fname, &st); |
| 67 | #endif |
| 68 | if (ret) |
| 69 | return -1; |
| 70 | |
| 71 | if (!S_ISDIR(st.st_mode)) { |
| 72 | if (robust_unlink(fname) == 0 || errno == ENOENT) |
| 73 | return 0; |
| 74 | rsyserr(FERROR, errno, "delete_file: unlink %s failed", |
| 75 | full_fname(fname)); |
| 76 | return -1; |
| 77 | } |
| 78 | |
| 79 | if (do_rmdir(fname) == 0 || errno == ENOENT) |
| 80 | return 0; |
| 81 | if (!force_delete || !recurse |
| 82 | || (errno != ENOTEMPTY && errno != EEXIST)) { |
| 83 | rsyserr(FERROR, errno, "delete_file: rmdir %s failed", |
| 84 | full_fname(fname)); |
| 85 | return -1; |
| 86 | } |
| 87 | |
| 88 | /* now we do a recsursive delete on the directory ... */ |
| 89 | if (!(d = opendir(fname))) { |
| 90 | rsyserr(FERROR, errno, "delete_file: opendir %s failed", |
| 91 | full_fname(fname)); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) { |
| 96 | char *dname = d_name(di); |
| 97 | if (dname[0] == '.' && (dname[1] == '\0' |
| 98 | || (dname[1] == '.' && dname[2] == '\0'))) |
| 99 | continue; |
| 100 | pathjoin(buf, sizeof buf, fname, dname); |
| 101 | if (verbose > 0) |
| 102 | rprintf(FINFO, "deleting %s\n", safe_fname(buf)); |
| 103 | if (delete_file(buf) != 0) { |
| 104 | closedir(d); |
| 105 | return -1; |
| 106 | } |
| 107 | } |
| 108 | if (errno) { |
| 109 | rsyserr(FERROR, errno, "delete_file: readdir %s failed", |
| 110 | full_fname(fname)); |
| 111 | closedir(d); |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | closedir(d); |
| 116 | |
| 117 | if (do_rmdir(fname) != 0) { |
| 118 | rsyserr(FERROR, errno, "delete_file: rmdir %s failed", |
| 119 | full_fname(fname)); |
| 120 | return -1; |
| 121 | } |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st, |
| 127 | int flags) |
| 128 | { |
| 129 | int updated = 0; |
| 130 | STRUCT_STAT st2; |
| 131 | int change_uid, change_gid; |
| 132 | |
| 133 | if (dry_run) |
| 134 | return 0; |
| 135 | |
| 136 | if (!st) { |
| 137 | if (link_stat(fname, &st2, 0) < 0) { |
| 138 | rsyserr(FERROR, errno, "stat %s failed", |
| 139 | full_fname(fname)); |
| 140 | return 0; |
| 141 | } |
| 142 | st = &st2; |
| 143 | } |
| 144 | |
| 145 | if (!preserve_times || S_ISLNK(st->st_mode) |
| 146 | || (make_backups && !backup_dir && S_ISDIR(st->st_mode))) |
| 147 | flags |= PERMS_SKIP_MTIME; |
| 148 | if (!(flags & PERMS_SKIP_MTIME) |
| 149 | && cmp_modtime(st->st_mtime, file->modtime) != 0) { |
| 150 | /* don't complain about not setting times on directories |
| 151 | * because some filesystems can't do it */ |
| 152 | if (set_modtime(fname,file->modtime) != 0 && |
| 153 | !S_ISDIR(st->st_mode)) { |
| 154 | rsyserr(FERROR, errno, "failed to set times on %s", |
| 155 | full_fname(fname)); |
| 156 | return 0; |
| 157 | } |
| 158 | updated = 1; |
| 159 | } |
| 160 | |
| 161 | change_uid = am_root && preserve_uid && st->st_uid != file->uid; |
| 162 | change_gid = preserve_gid && file->gid != GID_NONE |
| 163 | && st->st_gid != file->gid; |
| 164 | if (change_uid || change_gid) { |
| 165 | if (verbose > 2) { |
| 166 | if (change_uid) { |
| 167 | rprintf(FINFO, |
| 168 | "set uid of %s from %ld to %ld\n", |
| 169 | fname, (long)st->st_uid, (long)file->uid); |
| 170 | } |
| 171 | if (change_gid) { |
| 172 | rprintf(FINFO, |
| 173 | "set gid of %s from %ld to %ld\n", |
| 174 | fname, (long)st->st_gid, (long)file->gid); |
| 175 | } |
| 176 | } |
| 177 | if (do_lchown(fname, |
| 178 | change_uid ? file->uid : st->st_uid, |
| 179 | change_gid ? file->gid : st->st_gid) != 0) { |
| 180 | /* shouldn't have attempted to change uid or gid |
| 181 | * unless have the privilege */ |
| 182 | rsyserr(FERROR, errno, "%s %s failed", |
| 183 | change_uid ? "chown" : "chgrp", |
| 184 | full_fname(fname)); |
| 185 | return 0; |
| 186 | } |
| 187 | /* a lchown had been done - we have to re-stat if the |
| 188 | * destination had the setuid or setgid bits set due |
| 189 | * to the side effect of the chown call */ |
| 190 | if (st->st_mode & (S_ISUID | S_ISGID)) { |
| 191 | link_stat(fname, st, |
| 192 | keep_dirlinks && S_ISDIR(st->st_mode)); |
| 193 | } |
| 194 | updated = 1; |
| 195 | } |
| 196 | |
| 197 | #ifdef HAVE_CHMOD |
| 198 | if (!S_ISLNK(st->st_mode)) { |
| 199 | if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) { |
| 200 | updated = 1; |
| 201 | if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) { |
| 202 | rsyserr(FERROR, errno, "failed to set permissions on %s", |
| 203 | full_fname(fname)); |
| 204 | return 0; |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | #endif |
| 209 | |
| 210 | if (verbose > 1 && flags & PERMS_REPORT) { |
| 211 | if (updated) |
| 212 | rprintf(FINFO,"%s\n",fname); |
| 213 | else |
| 214 | rprintf(FINFO,"%s is uptodate\n",fname); |
| 215 | } |
| 216 | return updated; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | void sig_int(void) |
| 221 | { |
| 222 | /* KLUGE: if the user hits Ctrl-C while ssh is prompting |
| 223 | * for a password, then our cleanup's sending of a SIGUSR1 |
| 224 | * signal to all our children may kill ssh before it has a |
| 225 | * chance to restore the tty settings (i.e. turn echo back |
| 226 | * on). By sleeping for a short time, ssh gets a bigger |
| 227 | * chance to do the right thing. If child processes are |
| 228 | * not ssh waiting for a password, then this tiny delay |
| 229 | * shouldn't hurt anything. */ |
| 230 | msleep(400); |
| 231 | exit_cleanup(RERR_SIGNAL); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | /* finish off a file transfer, renaming the file and setting the permissions |
| 236 | and ownership */ |
| 237 | void finish_transfer(char *fname, char *fnametmp, struct file_struct *file, |
| 238 | int ok_to_set_time) |
| 239 | { |
| 240 | int ret; |
| 241 | |
| 242 | if (make_backups && !make_backup(fname)) |
| 243 | return; |
| 244 | |
| 245 | if (inplace) { |
| 246 | if (verbose > 2) |
| 247 | rprintf(FINFO, "finishing %s\n", fname); |
| 248 | goto do_set_perms; |
| 249 | } |
| 250 | |
| 251 | /* move tmp file over real file */ |
| 252 | if (verbose > 2) |
| 253 | rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname); |
| 254 | ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS); |
| 255 | if (ret < 0) { |
| 256 | rsyserr(FERROR, errno, "%s %s -> \"%s\"", |
| 257 | ret == -2 ? "copy" : "rename", |
| 258 | full_fname(fnametmp), fname); |
| 259 | do_unlink(fnametmp); |
| 260 | return; |
| 261 | } |
| 262 | do_set_perms: |
| 263 | set_perms(fname, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME); |
| 264 | } |
| 265 | |
| 266 | const char *who_am_i(void) |
| 267 | { |
| 268 | return am_sender ? "sender" : am_generator ? "generator" : "receiver"; |
| 269 | } |