| 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 daemon_log_format_has_i; |
| 28 | extern int preserve_times; |
| 29 | extern int omit_dir_times; |
| 30 | extern int am_root; |
| 31 | extern int am_server; |
| 32 | extern int am_sender; |
| 33 | extern int am_generator; |
| 34 | extern int am_starting_up; |
| 35 | extern int preserve_uid; |
| 36 | extern int preserve_gid; |
| 37 | extern int inplace; |
| 38 | extern int keep_dirlinks; |
| 39 | extern int make_backups; |
| 40 | extern struct stats stats; |
| 41 | |
| 42 | |
| 43 | /* |
| 44 | free a sums struct |
| 45 | */ |
| 46 | void free_sums(struct sum_struct *s) |
| 47 | { |
| 48 | if (s->sums) free(s->sums); |
| 49 | free(s); |
| 50 | } |
| 51 | |
| 52 | |
| 53 | int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st, |
| 54 | int flags) |
| 55 | { |
| 56 | int updated = 0; |
| 57 | STRUCT_STAT st2; |
| 58 | int change_uid, change_gid; |
| 59 | |
| 60 | if (!st) { |
| 61 | if (dry_run) |
| 62 | return 1; |
| 63 | if (link_stat(fname, &st2, 0) < 0) { |
| 64 | rsyserr(FERROR, errno, "stat %s failed", |
| 65 | full_fname(fname)); |
| 66 | return 0; |
| 67 | } |
| 68 | st = &st2; |
| 69 | } |
| 70 | |
| 71 | if (!preserve_times || S_ISLNK(st->st_mode) |
| 72 | || (S_ISDIR(st->st_mode) && omit_dir_times)) |
| 73 | flags |= PERMS_SKIP_MTIME; |
| 74 | if (!(flags & PERMS_SKIP_MTIME) |
| 75 | && cmp_modtime(st->st_mtime, file->modtime) != 0) { |
| 76 | if (set_modtime(fname,file->modtime) != 0) { |
| 77 | rsyserr(FERROR, errno, "failed to set times on %s", |
| 78 | full_fname(fname)); |
| 79 | return 0; |
| 80 | } |
| 81 | updated = 1; |
| 82 | } |
| 83 | |
| 84 | change_uid = am_root && preserve_uid && st->st_uid != file->uid; |
| 85 | change_gid = preserve_gid && file->gid != GID_NONE |
| 86 | && st->st_gid != file->gid; |
| 87 | #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK |
| 88 | if (S_ISLNK(st->st_mode)) |
| 89 | ; |
| 90 | else |
| 91 | #endif |
| 92 | if (change_uid || change_gid) { |
| 93 | if (verbose > 2) { |
| 94 | if (change_uid) { |
| 95 | rprintf(FINFO, |
| 96 | "set uid of %s from %ld to %ld\n", |
| 97 | safe_fname(fname), |
| 98 | (long)st->st_uid, (long)file->uid); |
| 99 | } |
| 100 | if (change_gid) { |
| 101 | rprintf(FINFO, |
| 102 | "set gid of %s from %ld to %ld\n", |
| 103 | safe_fname(fname), |
| 104 | (long)st->st_gid, (long)file->gid); |
| 105 | } |
| 106 | } |
| 107 | if (do_lchown(fname, |
| 108 | change_uid ? file->uid : st->st_uid, |
| 109 | change_gid ? file->gid : st->st_gid) != 0) { |
| 110 | /* shouldn't have attempted to change uid or gid |
| 111 | * unless have the privilege */ |
| 112 | rsyserr(FERROR, errno, "%s %s failed", |
| 113 | change_uid ? "chown" : "chgrp", |
| 114 | full_fname(fname)); |
| 115 | return 0; |
| 116 | } |
| 117 | /* a lchown had been done - we have to re-stat if the |
| 118 | * destination had the setuid or setgid bits set due |
| 119 | * to the side effect of the chown call */ |
| 120 | if (st->st_mode & (S_ISUID | S_ISGID)) { |
| 121 | link_stat(fname, st, |
| 122 | keep_dirlinks && S_ISDIR(st->st_mode)); |
| 123 | } |
| 124 | updated = 1; |
| 125 | } |
| 126 | |
| 127 | #ifdef HAVE_CHMOD |
| 128 | if (!S_ISLNK(st->st_mode)) { |
| 129 | if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) { |
| 130 | updated = 1; |
| 131 | if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) { |
| 132 | rsyserr(FERROR, errno, "failed to set permissions on %s", |
| 133 | full_fname(fname)); |
| 134 | return 0; |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | #endif |
| 139 | |
| 140 | if (verbose > 1 && flags & PERMS_REPORT) { |
| 141 | enum logcode code = daemon_log_format_has_i || dry_run |
| 142 | ? FCLIENT : FINFO; |
| 143 | if (updated) |
| 144 | rprintf(code, "%s\n", safe_fname(fname)); |
| 145 | else |
| 146 | rprintf(code, "%s is uptodate\n", safe_fname(fname)); |
| 147 | } |
| 148 | return updated; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | void sig_int(void) |
| 153 | { |
| 154 | /* KLUGE: if the user hits Ctrl-C while ssh is prompting |
| 155 | * for a password, then our cleanup's sending of a SIGUSR1 |
| 156 | * signal to all our children may kill ssh before it has a |
| 157 | * chance to restore the tty settings (i.e. turn echo back |
| 158 | * on). By sleeping for a short time, ssh gets a bigger |
| 159 | * chance to do the right thing. If child processes are |
| 160 | * not ssh waiting for a password, then this tiny delay |
| 161 | * shouldn't hurt anything. */ |
| 162 | msleep(400); |
| 163 | exit_cleanup(RERR_SIGNAL); |
| 164 | } |
| 165 | |
| 166 | |
| 167 | /* finish off a file transfer, renaming the file and setting the permissions |
| 168 | and ownership */ |
| 169 | void finish_transfer(char *fname, char *fnametmp, struct file_struct *file, |
| 170 | int ok_to_set_time, int overwriting_basis) |
| 171 | { |
| 172 | int ret; |
| 173 | |
| 174 | if (inplace) { |
| 175 | if (verbose > 2) |
| 176 | rprintf(FINFO, "finishing %s\n", safe_fname(fname)); |
| 177 | goto do_set_perms; |
| 178 | } |
| 179 | |
| 180 | if (make_backups && overwriting_basis && !make_backup(fname)) |
| 181 | return; |
| 182 | |
| 183 | /* Change permissions before putting the file into place. */ |
| 184 | set_perms(fnametmp, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME); |
| 185 | |
| 186 | /* move tmp file over real file */ |
| 187 | if (verbose > 2) { |
| 188 | rprintf(FINFO, "renaming %s to %s\n", |
| 189 | safe_fname(fnametmp), safe_fname(fname)); |
| 190 | } |
| 191 | ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS); |
| 192 | if (ret < 0) { |
| 193 | rsyserr(FERROR, errno, "%s %s -> \"%s\"", |
| 194 | ret == -2 ? "copy" : "rename", |
| 195 | full_fname(fnametmp), safe_fname(fname)); |
| 196 | do_unlink(fnametmp); |
| 197 | return; |
| 198 | } |
| 199 | if (ret == 0) { |
| 200 | /* The file was moved into place (not copied), so it's done. */ |
| 201 | return; |
| 202 | } |
| 203 | do_set_perms: |
| 204 | set_perms(fname, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME); |
| 205 | } |
| 206 | |
| 207 | const char *who_am_i(void) |
| 208 | { |
| 209 | if (am_starting_up) |
| 210 | return am_server ? "server" : "client"; |
| 211 | return am_sender ? "sender" : am_generator ? "generator" : "receiver"; |
| 212 | } |