1/* 2 * Routines common to more than one of the rsync processes. 3 * 4 * Copyright (C) 1996 Andrew Tridgell 5 * Copyright (C) 1996 Paul Mackerras 6 * Copyright (C) 2003, 2004, 2005, 2006 Wayne Davison 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. 21 */ 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 33extern int verbose; 34extern int dry_run; 35extern int preserve_perms; 36extern int preserve_executability; 37extern int preserve_times; 38extern int omit_dir_times; 39extern int am_root; 40extern int am_server; 41extern int am_sender; 42extern int am_generator; 43extern int am_starting_up; 44extern int allow_8bit_chars; 45extern int preserve_uid; 46extern int preserve_gid; 47extern int inplace; 48extern int keep_dirlinks; 49extern int make_backups; 50extern mode_t orig_umask; 51extern struct stats stats; 52extern struct chmod_mode_struct *daemon_chmod_modes; 53 54#if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H 55iconv_t ic_chck = (iconv_t)-1; 56 57static const char *default_charset(void) 58{ 59#if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET 60 return locale_charset(); 61#elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO 62 return nl_langinfo(CODESET); 63#else 64 return ""; /* Works with (at the very least) gnu iconv... */ 65#endif 66} 67 68void setup_iconv() 69{ 70 if (!am_server && !allow_8bit_chars) { 71 const char *defset = default_charset(); 72 73 /* It's OK if this fails... */ 74 ic_chck = iconv_open(defset, defset); 75 76 if (verbose > 3) { 77 if (ic_chck == (iconv_t)-1) { 78 rprintf(FINFO, 79 "note: iconv_open(\"%s\", \"%s\") failed (%d)" 80 " -- using isprint() instead of iconv().\n", 81 defset, defset, errno); 82 } else { 83 rprintf(FINFO, 84 "note: iconv_open(\"%s\", \"%s\") succeeded.\n", 85 defset, defset); 86 } 87 } 88 } 89} 90#endif 91 92/* 93 free a sums struct 94 */ 95void free_sums(struct sum_struct *s) 96{ 97 if (s->sums) free(s->sums); 98 free(s); 99} 100 101/* This is only called when we aren't preserving permissions. Figure out what 102 * the permissions should be and return them merged back into the mode. */ 103mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int exists) 104{ 105 int new_mode; 106 /* If the file already exists, we'll return the local permissions, 107 * possibly tweaked by the --executability option. */ 108 if (exists) { 109 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS); 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 new_mode &= ~0111; 116 else if (!(stat_mode & 0111)) 117 new_mode |= (new_mode & 0444) >> 2; 118 } 119 } else { 120 /* Apply the umask and turn off special permissions. */ 121 new_mode = flist_mode & (~CHMOD_BITS | (ACCESSPERMS & ~orig_umask)); 122 } 123 return new_mode; 124} 125 126int set_file_attrs(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 mode_t new_mode = file->mode; 133 134 if (!st) { 135 if (dry_run) 136 return 1; 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 if (!preserve_perms && S_ISDIR(new_mode) 144 && st->st_mode & S_ISGID) { 145 /* We just created this directory and its setgid 146 * bit is on, so make sure it stays on. */ 147 new_mode |= S_ISGID; 148 } 149 } 150 151 if (!preserve_times || (S_ISDIR(st->st_mode) && omit_dir_times)) 152 flags |= ATTRS_SKIP_MTIME; 153 if (!(flags & ATTRS_SKIP_MTIME) 154 && cmp_time(st->st_mtime, file->modtime) != 0) { 155 int ret = set_modtime(fname, file->modtime, st->st_mode); 156 if (ret < 0) { 157 rsyserr(FERROR, errno, "failed to set times on %s", 158 full_fname(fname)); 159 return 0; 160 } 161 if (ret == 0) /* ret == 1 if symlink could not be set */ 162 updated = 1; 163 } 164 165 change_uid = am_root && preserve_uid && st->st_uid != file->uid; 166 change_gid = preserve_gid && file->gid != GID_NONE 167 && st->st_gid != file->gid; 168#if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK 169 if (S_ISLNK(st->st_mode)) 170 ; 171 else 172#endif 173 if (change_uid || change_gid) { 174 if (verbose > 2) { 175 if (change_uid) { 176 rprintf(FINFO, 177 "set uid of %s from %ld to %ld\n", 178 fname, 179 (long)st->st_uid, (long)file->uid); 180 } 181 if (change_gid) { 182 rprintf(FINFO, 183 "set gid of %s from %ld to %ld\n", 184 fname, 185 (long)st->st_gid, (long)file->gid); 186 } 187 } 188 if (do_lchown(fname, 189 change_uid ? file->uid : st->st_uid, 190 change_gid ? file->gid : st->st_gid) != 0) { 191 /* shouldn't have attempted to change uid or gid 192 * unless have the privilege */ 193 rsyserr(FERROR, errno, "%s %s failed", 194 change_uid ? "chown" : "chgrp", 195 full_fname(fname)); 196 return 0; 197 } 198 /* a lchown had been done - we have to re-stat if the 199 * destination had the setuid or setgid bits set due 200 * to the side effect of the chown call */ 201 if (st->st_mode & (S_ISUID | S_ISGID)) { 202 link_stat(fname, st, 203 keep_dirlinks && S_ISDIR(st->st_mode)); 204 } 205 updated = 1; 206 } 207 208 if (daemon_chmod_modes && !S_ISLNK(new_mode)) 209 new_mode = tweak_mode(new_mode, daemon_chmod_modes); 210#ifdef HAVE_CHMOD 211 if ((st->st_mode & CHMOD_BITS) != (new_mode & CHMOD_BITS)) { 212 int ret = do_chmod(fname, new_mode); 213 if (ret < 0) { 214 rsyserr(FERROR, errno, 215 "failed to set permissions on %s", 216 full_fname(fname)); 217 return 0; 218 } 219 if (ret == 0) /* ret == 1 if symlink could not be set */ 220 updated = 1; 221 } 222#endif 223 224 if (verbose > 1 && flags & ATTRS_REPORT) { 225 if (updated) 226 rprintf(FCLIENT, "%s\n", fname); 227 else 228 rprintf(FCLIENT, "%s is uptodate\n", fname); 229 } 230 return updated; 231} 232 233RETSIGTYPE sig_int(UNUSED(int val)) 234{ 235 /* KLUGE: if the user hits Ctrl-C while ssh is prompting 236 * for a password, then our cleanup's sending of a SIGUSR1 237 * signal to all our children may kill ssh before it has a 238 * chance to restore the tty settings (i.e. turn echo back 239 * on). By sleeping for a short time, ssh gets a bigger 240 * chance to do the right thing. If child processes are 241 * not ssh waiting for a password, then this tiny delay 242 * shouldn't hurt anything. */ 243 msleep(400); 244 exit_cleanup(RERR_SIGNAL); 245} 246 247/* Finish off a file transfer: renaming the file and setting the file's 248 * attributes (e.g. permissions, ownership, etc.). If partialptr is not 249 * NULL and the robust_rename() call is forced to copy the temp file, we 250 * stage the file into the partial-dir and then rename it into place. */ 251void finish_transfer(char *fname, char *fnametmp, char *partialptr, 252 struct file_struct *file, int ok_to_set_time, 253 int overwriting_basis) 254{ 255 int ret; 256 257 if (inplace) { 258 if (verbose > 2) 259 rprintf(FINFO, "finishing %s\n", fname); 260 fnametmp = fname; 261 goto do_set_file_attrs; 262 } 263 264 if (make_backups && overwriting_basis && !make_backup(fname)) 265 return; 266 267 /* Change permissions before putting the file into place. */ 268 set_file_attrs(fnametmp, file, NULL, 269 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME); 270 271 /* move tmp file over real file */ 272 if (verbose > 2) 273 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname); 274 ret = robust_rename(fnametmp, fname, partialptr, 275 file->mode & INITACCESSPERMS); 276 if (ret < 0) { 277 rsyserr(FERROR, errno, "%s %s -> \"%s\"", 278 ret == -2 ? "copy" : "rename", 279 full_fname(fnametmp), fname); 280 do_unlink(fnametmp); 281 return; 282 } 283 if (ret == 0) { 284 /* The file was moved into place (not copied), so it's done. */ 285 return; 286 } 287 /* The file was copied, so tweak the perms of the copied file. If it 288 * was copied to partialptr, move it into its final destination. */ 289 fnametmp = partialptr ? partialptr : fname; 290 291 do_set_file_attrs: 292 set_file_attrs(fnametmp, file, NULL, 293 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME); 294 295 if (partialptr) { 296 if (do_rename(fnametmp, fname) < 0) { 297 rsyserr(FERROR, errno, "rename %s -> \"%s\"", 298 full_fname(fnametmp), fname); 299 } else 300 handle_partial_dir(partialptr, PDIR_DELETE); 301 } 302} 303 304const char *who_am_i(void) 305{ 306 if (am_starting_up) 307 return am_server ? "server" : "client"; 308 return am_sender ? "sender" : am_generator ? "generator" : "receiver"; 309} 310