| 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 | #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H |
| 25 | #include <iconv.h> |
| 26 | #endif |
| 27 | #if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET |
| 28 | #include <libcharset.h> |
| 29 | #elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO |
| 30 | #include <langinfo.h> |
| 31 | #endif |
| 32 | |
| 33 | extern int verbose; |
| 34 | extern int dry_run; |
| 35 | extern int daemon_log_format_has_i; |
| 36 | extern int preserve_perms; |
| 37 | extern int preserve_executability; |
| 38 | extern int preserve_times; |
| 39 | extern int omit_dir_times; |
| 40 | extern int orig_umask; |
| 41 | extern int am_root; |
| 42 | extern int am_server; |
| 43 | extern int am_sender; |
| 44 | extern int am_generator; |
| 45 | extern int am_starting_up; |
| 46 | extern int preserve_uid; |
| 47 | extern int preserve_gid; |
| 48 | extern int inplace; |
| 49 | extern int keep_dirlinks; |
| 50 | extern int make_backups; |
| 51 | extern struct stats stats; |
| 52 | |
| 53 | #if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H |
| 54 | iconv_t ic_chck = (iconv_t)-1; |
| 55 | |
| 56 | static const char *default_charset(void) |
| 57 | { |
| 58 | #if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET |
| 59 | return locale_charset(); |
| 60 | #elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO |
| 61 | return nl_langinfo(CODESET); |
| 62 | #else |
| 63 | return ""; /* Works with (at the very least) gnu iconv... */ |
| 64 | #endif |
| 65 | } |
| 66 | |
| 67 | void setup_iconv() |
| 68 | { |
| 69 | const char *defset; |
| 70 | |
| 71 | if (!am_server) |
| 72 | return; |
| 73 | |
| 74 | defset = default_charset(); |
| 75 | |
| 76 | /* It's OK if this fails... */ |
| 77 | ic_chck = iconv_open(defset, defset); |
| 78 | |
| 79 | if (verbose > 3) { |
| 80 | if (ic_chck == (iconv_t)-1) { |
| 81 | rprintf(FINFO, |
| 82 | "note: iconv_open(\"%s\", \"%s\") failed (%d)" |
| 83 | " -- using isprint() instead of iconv().\n", |
| 84 | defset, defset, errno); |
| 85 | } else { |
| 86 | rprintf(FINFO, |
| 87 | "note: iconv_open(\"%s\", \"%s\") succeeded.\n", |
| 88 | defset, defset); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | #endif |
| 93 | |
| 94 | /* |
| 95 | free a sums struct |
| 96 | */ |
| 97 | void free_sums(struct sum_struct *s) |
| 98 | { |
| 99 | if (s->sums) free(s->sums); |
| 100 | free(s); |
| 101 | } |
| 102 | |
| 103 | /* This is only called when we aren't preserving permissions. Figure out what |
| 104 | * the permissions should be and return them merged back into the mode. */ |
| 105 | mode_t dest_mode(mode_t flist_mode, mode_t dest_mode, int exists) |
| 106 | { |
| 107 | /* If the file already exists, we'll return the local permissions, |
| 108 | * possibly tweaked by the --executability option. */ |
| 109 | if (exists) { |
| 110 | if (preserve_executability && S_ISREG(flist_mode)) { |
| 111 | /* If the source file is executable, grant execute |
| 112 | * rights to everyone who can read, but ONLY if the |
| 113 | * file isn't already executable. */ |
| 114 | if (!(flist_mode & 0111)) |
| 115 | dest_mode &= ~0111; |
| 116 | else if (!(dest_mode & 0111)) |
| 117 | dest_mode |= (dest_mode & 0444) >> 2; |
| 118 | } |
| 119 | } else |
| 120 | dest_mode = flist_mode & ACCESSPERMS & ~orig_umask; |
| 121 | return (flist_mode & ~CHMOD_BITS) | (dest_mode & CHMOD_BITS); |
| 122 | } |
| 123 | |
| 124 | int set_file_attrs(char *fname, struct file_struct *file, STRUCT_STAT *st, |
| 125 | int flags) |
| 126 | { |
| 127 | int updated = 0; |
| 128 | STRUCT_STAT st2; |
| 129 | int change_uid, change_gid; |
| 130 | |
| 131 | if (!st) { |
| 132 | if (dry_run) |
| 133 | return 1; |
| 134 | if (link_stat(fname, &st2, 0) < 0) { |
| 135 | rsyserr(FERROR, errno, "stat %s failed", |
| 136 | full_fname(fname)); |
| 137 | return 0; |
| 138 | } |
| 139 | st = &st2; |
| 140 | if (!preserve_perms && S_ISDIR(file->mode) |
| 141 | && st->st_mode & S_ISGID) { |
| 142 | /* We just created this directory and its setgid |
| 143 | * bit is on, so make sure it stays on. */ |
| 144 | file->mode |= S_ISGID; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | if (!preserve_times || (S_ISDIR(st->st_mode) && omit_dir_times)) |
| 149 | flags |= ATTRS_SKIP_MTIME; |
| 150 | if (!(flags & ATTRS_SKIP_MTIME) |
| 151 | && cmp_modtime(st->st_mtime, file->modtime) != 0) { |
| 152 | int ret = set_modtime(fname, file->modtime, st->st_mode); |
| 153 | if (ret < 0) { |
| 154 | rsyserr(FERROR, errno, "failed to set times on %s", |
| 155 | full_fname(fname)); |
| 156 | return 0; |
| 157 | } |
| 158 | if (ret == 0) /* ret == 1 if symlink could not be set */ |
| 159 | updated = 1; |
| 160 | } |
| 161 | |
| 162 | change_uid = am_root && preserve_uid && st->st_uid != file->uid; |
| 163 | change_gid = preserve_gid && file->gid != GID_NONE |
| 164 | && st->st_gid != file->gid; |
| 165 | #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK |
| 166 | if (S_ISLNK(st->st_mode)) |
| 167 | ; |
| 168 | else |
| 169 | #endif |
| 170 | if (change_uid || change_gid) { |
| 171 | if (verbose > 2) { |
| 172 | if (change_uid) { |
| 173 | rprintf(FINFO, |
| 174 | "set uid of %s from %ld to %ld\n", |
| 175 | fname, |
| 176 | (long)st->st_uid, (long)file->uid); |
| 177 | } |
| 178 | if (change_gid) { |
| 179 | rprintf(FINFO, |
| 180 | "set gid of %s from %ld to %ld\n", |
| 181 | fname, |
| 182 | (long)st->st_gid, (long)file->gid); |
| 183 | } |
| 184 | } |
| 185 | if (do_lchown(fname, |
| 186 | change_uid ? file->uid : st->st_uid, |
| 187 | change_gid ? file->gid : st->st_gid) != 0) { |
| 188 | /* shouldn't have attempted to change uid or gid |
| 189 | * unless have the privilege */ |
| 190 | rsyserr(FERROR, errno, "%s %s failed", |
| 191 | change_uid ? "chown" : "chgrp", |
| 192 | full_fname(fname)); |
| 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 | keep_dirlinks && S_ISDIR(st->st_mode)); |
| 201 | } |
| 202 | updated = 1; |
| 203 | } |
| 204 | |
| 205 | #ifdef HAVE_CHMOD |
| 206 | if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) { |
| 207 | int ret = do_chmod(fname, file->mode); |
| 208 | if (ret < 0) { |
| 209 | rsyserr(FERROR, errno, |
| 210 | "failed to set permissions on %s", |
| 211 | full_fname(fname)); |
| 212 | return 0; |
| 213 | } |
| 214 | if (ret == 0) /* ret == 1 if symlink could not be set */ |
| 215 | updated = 1; |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | if (verbose > 1 && flags & ATTRS_REPORT) { |
| 220 | enum logcode code = daemon_log_format_has_i || dry_run |
| 221 | ? FCLIENT : FINFO; |
| 222 | if (updated) |
| 223 | rprintf(code, "%s\n", fname); |
| 224 | else |
| 225 | rprintf(code, "%s is uptodate\n", fname); |
| 226 | } |
| 227 | return updated; |
| 228 | } |
| 229 | |
| 230 | RETSIGTYPE sig_int(UNUSED(int val)) |
| 231 | { |
| 232 | /* KLUGE: if the user hits Ctrl-C while ssh is prompting |
| 233 | * for a password, then our cleanup's sending of a SIGUSR1 |
| 234 | * signal to all our children may kill ssh before it has a |
| 235 | * chance to restore the tty settings (i.e. turn echo back |
| 236 | * on). By sleeping for a short time, ssh gets a bigger |
| 237 | * chance to do the right thing. If child processes are |
| 238 | * not ssh waiting for a password, then this tiny delay |
| 239 | * shouldn't hurt anything. */ |
| 240 | msleep(400); |
| 241 | exit_cleanup(RERR_SIGNAL); |
| 242 | } |
| 243 | |
| 244 | /* Finish off a file transfer: renaming the file and setting the file's |
| 245 | * attributes (e.g. permissions, ownership, etc.). If partialptr is not |
| 246 | * NULL and the robust_rename() call is forced to copy the temp file, we |
| 247 | * stage the file into the partial-dir and then rename it into place. */ |
| 248 | void finish_transfer(char *fname, char *fnametmp, char *partialptr, |
| 249 | struct file_struct *file, int ok_to_set_time, |
| 250 | int overwriting_basis) |
| 251 | { |
| 252 | int ret; |
| 253 | |
| 254 | if (inplace) { |
| 255 | if (verbose > 2) |
| 256 | rprintf(FINFO, "finishing %s\n", fname); |
| 257 | fnametmp = fname; |
| 258 | goto do_set_file_attrs; |
| 259 | } |
| 260 | |
| 261 | if (make_backups && overwriting_basis && !make_backup(fname)) |
| 262 | return; |
| 263 | |
| 264 | /* Change permissions before putting the file into place. */ |
| 265 | set_file_attrs(fnametmp, file, NULL, |
| 266 | ok_to_set_time ? 0 : ATTRS_SKIP_MTIME); |
| 267 | |
| 268 | /* move tmp file over real file */ |
| 269 | if (verbose > 2) |
| 270 | rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname); |
| 271 | ret = robust_rename(fnametmp, fname, partialptr, |
| 272 | file->mode & INITACCESSPERMS); |
| 273 | if (ret < 0) { |
| 274 | rsyserr(FERROR, errno, "%s %s -> \"%s\"", |
| 275 | ret == -2 ? "copy" : "rename", |
| 276 | full_fname(fnametmp), fname); |
| 277 | do_unlink(fnametmp); |
| 278 | return; |
| 279 | } |
| 280 | if (ret == 0) { |
| 281 | /* The file was moved into place (not copied), so it's done. */ |
| 282 | return; |
| 283 | } |
| 284 | /* The file was copied, so tweak the perms of the copied file. If it |
| 285 | * was copied to partialptr, move it into its final destination. */ |
| 286 | fnametmp = partialptr ? partialptr : fname; |
| 287 | |
| 288 | do_set_file_attrs: |
| 289 | set_file_attrs(fnametmp, file, NULL, |
| 290 | ok_to_set_time ? 0 : ATTRS_SKIP_MTIME); |
| 291 | |
| 292 | if (partialptr) { |
| 293 | if (do_rename(fnametmp, fname) < 0) { |
| 294 | rsyserr(FERROR, errno, "rename %s -> \"%s\"", |
| 295 | full_fname(fnametmp), fname); |
| 296 | } else |
| 297 | handle_partial_dir(partialptr, PDIR_DELETE); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | const char *who_am_i(void) |
| 302 | { |
| 303 | if (am_starting_up) |
| 304 | return am_server ? "server" : "client"; |
| 305 | return am_sender ? "sender" : am_generator ? "generator" : "receiver"; |
| 306 | } |