Daemon: change option name 'run_dir' to 'pidfile'

[pve-common.git] / data / PVE / Daemon.pm

diff --git a/data/PVE/Daemon.pm b/data/PVE/Daemon.pm
index 9ba05dc20949225d63fb49ad3e81058ae9f5cbcf..264f8be5e2a840aa7969a47ef95fbda017d7cbc8 100644 (file)
--- a/data/PVE/Daemon.pm
+++ b/data/PVE/Daemon.pm
@@ -12,14 +12,20 @@ package PVE::Daemon;
 # * handle worker processes (option 'max_workers')
 # * allow to restart while workers are still runningl
 #   (option 'leave_children_open_on_reload')
+# * run as different user using setuid/setgid
  
 use strict;
 use warnings;
+use English;
+
 use PVE::SafeSyslog;
 use PVE::INotify;
 
 use POSIX ":sys_wait_h";
 use Fcntl ':flock';
+use Socket qw(IPPROTO_TCP TCP_NODELAY SOMAXCONN);
+use IO::Socket::INET;
+
 use Getopt::Long;
 use Time::HiRes qw (gettimeofday);
 
@@ -178,7 +184,7 @@ my $start_workers = sub {
 };
 
 my $terminate_server = sub {
-    my ($self) = @_;
+    my ($self, $allow_open_children) = @_;
 
     $self->{terminate} = 1; # set flag to avoid worker restart
 
@@ -198,7 +204,7 @@ my $terminate_server = sub {
     }
 
     # if configured, leave children running on HUP
-    return if $self->{got_hup_signal} &&
+    return if $allow_open_children &&
        $self->{leave_children_open_on_reload};
 
     # else, send TERM to old workers
@@ -290,7 +296,7 @@ my $server_run = sub {
     local $SIG{TERM} = sub {
        local ($@, $!, $?); # do not overwrite error vars
        syslog('info', "received signal TERM");
-       &$terminate_server($self);
+       &$terminate_server($self, 0);
        &$server_cleanup($self);
        &$old_sig_term(@_) if $old_sig_term;
     };
@@ -299,7 +305,7 @@ my $server_run = sub {
     local $SIG{QUIT} = sub {
        local ($@, $!, $?); # do not overwrite error vars
        syslog('info', "received signal QUIT");
-       &$terminate_server($self);
+       &$terminate_server($self, 0);
        &$server_cleanup($self);
        &$old_sig_quit(@_) if $old_sig_quit;
     };
@@ -309,7 +315,7 @@ my $server_run = sub {
        local ($@, $!, $?); # do not overwrite error vars
        syslog('info', "received signal INT");
        $SIG{INT} = 'DEFAULT'; # allow to terminate now
-       &$terminate_server($self);
+       &$terminate_server($self, 0);
        &$server_cleanup($self);
        &$old_sig_int(@_) if $old_sig_int;
     };
@@ -319,7 +325,7 @@ my $server_run = sub {
        syslog('info', "received signal HUP");
        $self->{got_hup_signal} = 1;
        if ($self->{max_workers}) {
-           &$terminate_server($self);
+           &$terminate_server($self, 1);
        } elsif ($self->can('hup')) {
            eval { $self->hup() };
            warn $@ if $@;
@@ -355,7 +361,7 @@ my $server_run = sub {
     if ($err) {
        syslog ('err', "ERROR: $err");
 
-       &$terminate_server($self);
+       &$terminate_server($self, 1);
 
        if (my $wait_time = $self->{restart_on_error}) {
            $self->restart_daemon($wait_time);
@@ -405,30 +411,50 @@ sub new {
 
        $self = bless { 
            name => $name,
-           run_dir => '/var/run',
+           pidfile => "/var/run/${name}.pid",
            env_restart_pve_daemon => $restart,
            env_pve_lock_fd => $lockfd,
            workers => {},
            old_workers => {},
        }, $class;
 
+
        foreach my $opt (keys %params) {
            my $value = $params{$opt};
            if ($opt eq 'restart_on_error') {
                $self->{$opt} = $value;
            } elsif ($opt eq 'stop_wait_time') {
                $self->{$opt} = $value;
-           } elsif ($opt eq 'run_dir') {
+           } elsif ($opt eq 'pidfile') {
                $self->{$opt} = $value;
            } elsif ($opt eq 'max_workers') {
                $self->{$opt} = $value;
            } elsif ($opt eq 'leave_children_open_on_reload') {
                $self->{$opt} = $value;
+           } elsif ($opt eq 'setgid') {
+               $self->{$opt} = $value;
+           } elsif ($opt eq 'setuid') {
+               $self->{$opt} = $value;
            } else {
                die "unknown daemon option '$opt'\n";
            }
        }
        
+       if (my $gidstr = $self->{setgid}) {
+           my $gid = getgrnam($gidstr) || die "getgrnam failed - $!\n";
+           POSIX::setgid($gid) || die "setgid $gid failed - $!\n";
+           $EGID = "$gid $gid"; # this calls setgroups
+           # just to be sure
+           die "detected strange gid\n" if !($GID eq "$gid $gid" && $EGID eq "$gid $gid");
+       }
+
+       if (my $uidstr = $self->{setuid}) {
+           my $uid = getpwnam($uidstr) || die "getpwnam failed - $!\n";
+           POSIX::setuid($uid) || die "setuid $uid failed - $!\n";
+           # just to be sure
+           die "detected strange uid\n" if !($UID == $uid && $EUID == $uid);
+       }
+
        if ($restart && $self->{max_workers}) {
            if (my $wpids = $ENV{PVE_DAEMON_WORKER_PIDS}) {
                foreach my $pid (split(':', $wpids)) {
@@ -439,8 +465,6 @@ sub new {
            }
        }
 
-       $self->{pidfile} = "$self->{run_dir}/${name}.pid";
-
        $self->{nodename} = PVE::INotify::nodename();
 
        $self->{cmdline} = [];
@@ -755,5 +779,49 @@ sub register_status_command {
        }});
 }
 
+# some useful helper
+
+sub create_reusable_socket {
+    my ($self, $port, $host) = @_;
+
+    die "no port specifed" if !$port;
+
+    my ($socket, $sockfd);
+
+    if (defined($sockfd = $ENV{"PVE_DAEMON_SOCKET_$port"}) &&
+       $self->{env_restart_pve_daemon}) {
+
+       die "unable to parse socket fd '$sockfd'\n" 
+           if $sockfd !~ m/^(\d+)$/;
+       $sockfd = $1; # untaint
+
+       $socket = IO::Socket::INET->new;
+       $socket->fdopen($sockfd, 'w') || 
+           die "cannot fdopen file descriptor '$sockfd' - $!\n";
+
+    } else {
+
+       $socket = IO::Socket::INET->new(
+           LocalAddr => $host,
+           LocalPort => $port,
+           Listen => SOMAXCONN,
+           Proto  => 'tcp',
+           ReuseAddr => 1) ||
+           die "unable to create socket - $@\n";
+
+       # we often observe delays when using Nagle algorithm,
+       # so we disable that to maximize performance
+       setsockopt($socket, IPPROTO_TCP, TCP_NODELAY, 1);
+
+       $ENV{"PVE_DAEMON_SOCKET_$port"} = $socket->fileno;
+    }
+
+    # remove FD_CLOEXEC bit to reuse on exec
+    $socket->fcntl(Fcntl::F_SETFD(), 0);
+    
+    return $socket;
+}
+
+
 1;