static int
fdochroot(int fcwd)
{
if (fchroot(fcwd) != 0) {
syswarn(1, errno, "Can't fchroot to \".\"");
return -1;
}
return updatepath();
}
inline static void
restoreRoot(struct Options const *opt)
{
if (opt->do_chroot!=0 && fchroot(opt->cur_rootdir_fd)==-1) {
perror("secure-mount: fchdir(\"/\")");
WRITE_MSG(2, "Failed to restore root-directory; aborting\n");
exit(1);
}
}
static int
updateMtab(struct MountInfo const *mnt, struct Options const *opt)
{
int res = -1;
int fd;
assert(opt->mtab!=0);
if (opt->do_chroot && fchroot(opt->cur_dir_fd)==-1) {
perror("secure-mount: fchroot(\".\")");
return -1;
}
fd=open(opt->mtab, O_CREAT|O_APPEND|O_WRONLY, 0644);
if (fd==-1) {
perror("secure-mount: open(<mtab>)");
goto err0;
}
if (lockf(fd, F_LOCK, 0)==-1) {
perror("secure-mount: lockf()");
goto err1;
}
if (writeStrX(fd, mnt->src)==-1 ||
writeStrX(fd, " ")==-1 ||
writeStrX(fd, mnt->dst)==-1 ||
writeStrX(fd, mnt->xflag & XFLAG_FILE ? "/" : "")==-1 ||
writeStrX(fd, mnt->xflag & XFLAG_FILE ? mnt->name : "")==-1 ||
writeStrX(fd, " ")==-1 ||
writeStrX(fd, getType(mnt))==-1 ||
writeStrX(fd, " ")==-1 ||
writeStrX(fd, mnt->data ? mnt->data : "defaults")==-1 ||
writeStrX(fd, " 0 0\n")==-1) {
perror("secure-mount: write()");
goto err1;
}
res = 0;
err1: close(fd);
err0:
restoreRoot(opt);
return res;
}