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|
#!/usr/bin/perl -w
#
# $OpenBSD: recover,v 1.6 2000/04/21 17:06:13 millert Exp $
#
# Script to (safely) recover nvi edit sessions.
#
use Fcntl;
require 'sys/syscall.ph';
$recoverdir = $ARGV[0] || "/var/tmp/vi.recover";
$sendmail = "/usr/sbin/sendmail";
die "Sorry, $0 must be run as root\n" if $>;
# Make the recovery dir if it does not already exist.
if (!sysopen(DIR, $recoverdir, O_RDONLY|O_NOFOLLOW) || !stat(DIR)) {
die "Warning! $recoverdir is a symbolic link! (ignoring)\n"
if -l $recoverdir;
mkdir($recoverdir, 01777) || die "Unable to create $recoverdir: $!\n";
chmod(01777, $recoverdir);
exit(0);
}
#
# Sanity check the vi recovery dir
# Perl doesn't support fchdir, fchmod, or fchown so we call
# fchdir(2) via the syscall interface and then just modify ".".
#
die "Warning! $recoverdir is not a directory! (ignoring)\n"
unless -d _;
die "$0: can't chdir to $recoverdir: $!\n"
unless syscall(&SYS_fchdir, fileno(DIR)) == 0;
if (! -O _) {
warn "Warning! $recoverdir is not owned by root! (fixing)\n";
chown(0, 0, ".");
}
if (((stat(_))[2] & 07777) != 01777) {
warn "Warning! $recoverdir is not mode 01777! (fixing)\n";
chmod(01777, ".");
}
# Check editor backup files.
opendir(RECDIR, ".") || die "$0: can't open $recoverdir: $!\n";
foreach $file (readdir(RECDIR)) {
next unless $file =~ /^vi\./;
#
# Unmodified vi editor backup files either have the
# execute bit set or are zero length. Delete them.
# Anything that is not a normal file gets deleted too.
#
lstat($file) || die "$0: can't stat $file: $!\n";
if (-x _ || ! -s _ || ! -f _) {
unlink($file) unless -d _;
}
}
#
# It is possible to get incomplete recovery files if the editor crashes
# at the right time.
#
rewinddir(RECDIR);
foreach $file (readdir(RECDIR)) {
next unless $file =~ /^recover\./;
if (!sysopen(RECFILE, $file, O_RDONLY|O_NOFOLLOW)) {
warn "$0: can't open $file: $!\n";
next;
}
#
# Delete anything that is not a regular file as that is either
# filesystem corruption from fsck or an exploit attempt.
#
if (!stat(RECFILE)) {
warn "$0: can't stat $file: $!\n";
close(RECFILE);
next;
}
if (! -f _ || ! -s _) {
unlink($file) unless -d _;
close(RECFILE);
next;
}
#
# Slurp in the recover.* file and search for X-vi-recover-path
# (which should point to an existing vi.* file).
#
@recfile = <RECFILE>;
close(RECFILE);
@backups = grep(s/^X-vi-recover-path:\s*(.*)[\r\n]*$/$1/, @recfile);
#
# Delete any recovery files that are zero length, corrupted,
# or that have no corresponding backup file. Else send mail
# to the user.
#
if ($#backups != 0) {
unlink($file);
} elsif (! -s $backups[0]) {
unlink($file, $backups[0]);
} else {
open(SENDMAIL, "|$sendmail -t") ||
die "$0: can't run $sendmail -t: $!\n";
print SENDMAIL @recfile;
close(SENDMAIL);
}
}
closedir(RECDIR);
close(DIR);
exit(0);
|
