import of dnsmasq-2.16.tar.gz

CHANGELOG

@@ -1213,4 +1213,43 @@ version 2.15
 	    Improve error messages when there are problems with
 	    configuration.
 
+version 2.16
+	    Fixed typo in OpenBSD-only code which stopped compilation
+            under that OS. Chris Weinhaupl gets credit for reporting 
+            this.
+
+	    Added dhcp-authoritative option which restores non-RFC 
+	    compliant but desirable behaviour of pre-2.14 versions and
+            avoids long timeouts while DHCP clients try to renew leases
+            which are unknown to dnsmasq. Thanks to John Mastwijk for 
+	    help with this.	 
+
+	    Added support to the DHCP option code to allow RFC-3397 
+	    domain search DHCP option (119) to be sent.
+
+            Set NONBLOCK on all listening sockets to workaround non-POSIX
+            compliance in Linux 2.4 and 2.6. This fixes rare hangs which
+            occured when corrupted packets were received. Thanks to
+	    Joris van Rantwijk for chasing that down.
+ 
+	    Updated config.h for NetBSD. Thanks to Martin Lambers.
+
+            Do a better job of distinguishing between retransmissions
+	    and new queries when forwarding. This fixes a bug
+	    triggered by the polipo web cache which sends A and AAAA
+	    queries both with the same transaction-ID. Thanks to 
+	    Joachim Berdal Haga and Juliusz Chroboczek for help with this.
+
+	    Rewrote cache code to store CNAMES, rather then chasing
+	    them before storage. This eliminates bad situations when
+	    clients get inconsistent views depending on if data comes
+	    from the cache.
+
+	    Allow for more than one --addn-hosts flag.
+
+	    Clarify logged message when a DHCP lease clashes with an
+	    /etc/hosts entry. Thanks to Mat Swift for the suggestion.
+
+	    Added dynamic-dnsmasq from Peter Willis to the contrib
+	    section.
 

FAQ

@@ -284,6 +284,22 @@ A: Yes, new releases of dnsmasq are always announced through
    freshmeat.net, and they allow you to subcribe to email alerts when
    new versions of particular projects are released.
 
+Q: What does the dhcp-authoritative option do? 
+
+A: See http://www.isc.org/index.pl?/sw/dhcp/authoritative.php - that's
+   for the ISC daemon, but the same applies to dnsmasq.
+
+Q: Why does my Gentoo box pause for a minute before getting a new
+   lease?
+
+A: Because when a Gentoo box shuts down, it releases its lease with
+   the server but remembers it on the client; this seems to be a 
+   Gentoo-specific patch to dhcpcd. On restart it tries to renew
+   a lease which is long gone, as far as dnsmasq is concerned, and
+   dnsmasq ignores it until is times out and restarts the process.
+   To fix this, set the dhcp-authoritative flag in dnsmasq.
+
+
 
 
 	      

contrib/dynamic-dnsmasq/dynamic-dnsmasq.pl

+#!/usr/bin/perl
+# dynamic-dnsmasq.pl - update dnsmasq's internal dns entries dynamically
+# Copyright (C) 2004  Peter Willis
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+# 
+# the purpose of this script is to be able to update dnsmasq's dns
+# records from a remote dynamic dns client.
+# 
+# basic use of this script:
+# dynamic-dnsmasq.pl add testaccount 1234 testaccount.mydomain.com
+# dynamic-dnsmasq.pl listen &
+# 
+# this script tries to emulate DynDNS.org's dynamic dns service, so
+# technically you should be able to use any DynDNS.org client to
+# update the records here. tested and confirmed to work with ddnsu
+# 1.3.1. just point the client's host to the IP of this machine,
+# port 9020, and include the hostname, user and pass, and it should
+# work.
+# 
+# make sure "addn-hosts=/etc/dyndns-hosts" is in your /etc/dnsmasq.conf
+# file and "nopoll" is commented out.
+
+use strict;
+use IO::Socket;
+use MIME::Base64;
+use DB_File;
+use Fcntl;
+
+my $accountdb = "accounts.db";
+my $recordfile = "/etc/dyndns-hosts";
+my $dnsmasqpidfile = "/var/run/dnsmasq.pid"; # if this doesn't exist, will look for process in /proc
+my $listenaddress = "0.0.0.0";
+my $listenport = 9020;
+
+# no editing past this point should be necessary
+
+if ( @ARGV < 1 ) {
+	die "Usage: $0 ADD|DEL|LISTUSERS|WRITEHOSTSFILE|LISTEN\n";
+} elsif ( lc $ARGV[0] eq "add" ) {
+	die "Usage: $0 ADD USER PASS HOSTNAME\n" unless @ARGV == 4;
+	add_acct($ARGV[1], $ARGV[2], $ARGV[3]);
+} elsif ( lc $ARGV[0] eq "del" ) {
+	die "Usage: $0 DEL USER\n" unless @ARGV == 2;
+	print "Are you sure you want to delete user \"$ARGV[1]\"? [N/y] ";
+	my $resp = <STDIN>;
+	chomp $resp;
+	if ( lc substr($resp,0,1) eq "y" ) {
+		del_acct($ARGV[1]);
+	}
+} elsif ( lc $ARGV[0] eq "listusers" or lc $ARGV[0] eq "writehostsfile" ) {
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	my $fh;
+	if ( lc $ARGV[0] eq "writehostsfile" ) {
+        	open($fh, ">$recordfile") || die "Couldn't open recordfile \"$recordfile\": $!\n";
+	       	flock($fh, 2);
+	       	seek($fh, 0, 0);
+	       	truncate($fh, 0);
+        }
+	while ( my ($key, $val) = each %h ) {
+		my ($pass, $domain, $ip) = split("\t",$val);
+		if ( lc $ARGV[0] eq "listusers" ) {
+			print "user $key, hostname $domain, ip $ip\n";
+		} else {
+			if ( defined $ip ) {
+				print $fh "$ip\t$domain\n";
+			}
+		}
+	}
+	if ( lc $ARGV[0] eq "writehostsfile" ) {
+		flock($fh, 8);
+		close($fh);
+		dnsmasq_rescan_configs();
+	}
+	undef $X;
+	untie %h;
+} elsif ( lc $ARGV[0] eq "listen" ) {
+	listen_for_updates();
+}
+
+sub listen_for_updates {
+	my $sock = IO::Socket::INET->new(Listen    => 5,
+		LocalAddr => $listenaddress, LocalPort => $listenport,
+		Proto     => 'tcp', ReuseAddr => 1,
+		MultiHomed => 1) || die "Could not open listening socket: $!\n";
+	$SIG{'CHLD'} = 'IGNORE';
+	while ( my $client = $sock->accept() ) {
+		my $p = fork();
+		if ( $p != 0 ) {
+			next;
+		}
+		$SIG{'CHLD'} = 'DEFAULT';
+		my @headers;
+		my %cgi;
+		while ( <$client> ) {
+			s/(\r|\n)//g;
+			last if $_ eq "";
+			push @headers, $_;
+		}
+		foreach my $header (@headers) {
+			if ( $header =~ /^GET \/nic\/update\?([^\s].+) HTTP\/1\.[01]$/ ) {
+				foreach my $element (split('&', $1)) {
+					$cgi{(split '=', $element)[0]} = (split '=', $element)[1];
+				}
+			} elsif ( $header =~ /^Authorization: basic (.+)$/ ) {
+				unless ( defined $cgi{'hostname'} ) {
+					print_http_response($client, undef, "badsys");
+					exit(1);
+				}
+				if ( !exists $cgi{'myip'} ) {
+					$cgi{'myip'} = $client->peerhost();
+				}
+				my ($user,$pass) = split ":", MIME::Base64::decode($1);
+				if ( authorize($user, $pass, $cgi{'hostname'}, $cgi{'myip'}) == 0 ) {
+					print_http_response($client, $cgi{'myip'}, "good");
+					update_dns(\%cgi);
+				} else {
+					print_http_response($client, undef, "badauth");
+					exit(1);
+				}
+				last;
+			}
+		}
+		exit(0);
+	}
+	return(0);
+}
+
+sub add_acct {
+	my ($user, $pass, $hostname) = @_;
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	$X->put($user, join("\t", ($pass, $hostname)));
+	undef $X;
+	untie %h;
+}
+
+sub del_acct {
+        my ($user, $pass, $hostname) = @_;
+        my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+        $X->del($user);
+        undef $X;
+        untie %h;
+}
+
+
+sub authorize {
+	my $user = shift;
+	my $pass = shift;
+	my $hostname = shift;
+	my $ip = shift;;
+	my $X = tie my %h, "DB_File", $accountdb, O_RDWR|O_CREAT, 0600, $DB_HASH;
+	my ($spass, $shost) = split("\t", $h{$user});
+	if ( defined $h{$user} and ($spass eq $pass) and ($shost eq $hostname) ) {
+		$X->put($user, join("\t", $spass, $shost, $ip));
+		undef $X;
+		untie %h;
+		return(0);
+	}
+	undef $X;
+	untie %h;
+	return(1);
+}
+
+sub print_http_response {
+	my $sock = shift;
+	my $ip = shift;
+	my $response = shift;
+	print $sock "HTTP/1.0 200 OK\n";
+	my @tmp = split /\s+/, scalar gmtime();
+	print $sock "Date: $tmp[0], $tmp[2] $tmp[1] $tmp[4] $tmp[3] GMT\n";
+	print $sock "Server: Peter's Fake DynDNS.org Server/1.0\n";
+	print $sock "Content-Type: text/plain; charset=ISO-8859-1\n";
+	print $sock "Connection: close\n";
+	print $sock "Transfer-Encoding: chunked\n";
+	print $sock "\n";
+	#print $sock "12\n"; # this was part of the dyndns response but i'm not sure what it is
+	print $sock "$response", defined($ip)? " $ip" : "" . "\n";
+}
+
+sub update_dns {
+	my $hashref = shift;
+	my @records;
+	my $found = 0;
+	# update the addn-hosts file
+	open(FILE, "+<$recordfile") || die "Couldn't open recordfile \"$recordfile\": $!\n";
+	flock(FILE, 2);
+	while ( <FILE> ) {
+		if ( /^(\d+\.\d+\.\d+\.\d+)\s+$$hashref{'hostname'}\n$/si ) {
+			if ( $1 ne $$hashref{'myip'} ) {
+				push @records, "$$hashref{'myip'}\t$$hashref{'hostname'}\n";
+				$found = 1;
+			}
+		} else {
+			push @records, $_;
+		}
+	}
+	unless ( $found ) {
+		push @records, "$$hashref{'myip'}\t$$hashref{'hostname'}\n";
+	}
+	sysseek(FILE, 0, 0);
+	truncate(FILE, 0);
+	syswrite(FILE, join("", @records));
+	flock(FILE, 8);
+	close(FILE);
+	dnsmasq_rescan_configs();
+	return(0);
+}
+
+sub dnsmasq_rescan_configs {
+	# send the HUP signal to dnsmasq
+	if ( -r $dnsmasqpidfile ) {
+		open(PID,"<$dnsmasqpidfile") || die "Could not open PID file \"$dnsmasqpidfile\": $!\n";
+		my $pid = <PID>;
+		close(PID);
+		chomp $pid;
+		if ( kill(0, $pid) ) {
+			kill(1, $pid);
+		} else {
+			goto LOOKFORDNSMASQ;
+		}
+	} else {
+		LOOKFORDNSMASQ:
+		opendir(DIR,"/proc") || die "Couldn't opendir /proc: $!\n";
+		my @dirs = grep(/^\d+$/, readdir(DIR));
+		closedir(DIR);
+		foreach my $process (@dirs) {
+			if ( open(FILE,"</proc/$process/cmdline") ) {
+				my $cmdline = <FILE>;
+				close(FILE);
+				if ( (split(/\0/,$cmdline))[0] =~ /dnsmasq/ ) {
+					kill(1, $process);
+				}
+			}
+		}
+	}
+	return(0);
+}

dnsmasq-rh.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.15
+Version: 2.16
 Release: 1
 Copyright: GPL
 Group: System Environment/Daemons

dnsmasq-suse.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.15
+Version: 2.16
 Release: 1
 Copyright: GPL
 Group: Productivity/Networking/DNS/Servers

dnsmasq.8

@@ -34,8 +34,8 @@ Don't read the hostnames in /etc/hosts.
 .TP
 .B \-H, --addn-hosts=<file>
 Additional hosts file. Read the specified file as well as /etc/hosts. If -h is given, read
-only the specified file. At most one additional hosts file may be
-given.
+only the specified file. This option may be repeated for more than one
+additional hosts file.
 .TP
 .B \-T, --local-ttl=<time>
 When replying with information from /etc/hosts or the DHCP leases
@@ -423,6 +423,12 @@ default is 150. This limit is to prevent DoS attacks from hosts which
 create thousands of leases and use lots of memory in the dnsmasq
 process.
 .TP
+.B \-K, --dhcp-authoritative
+Should be set when dnsmasq is definatively the only DHCP server on a network.
+It changes the behaviour from strict RFC compliance so that DHCP requests on
+unknown leases from unknown hosts are not ignored. This allows new hosts
+to get a lease without a tedious timeout under all circumstances.
+.TP
 .B \-l, --dhcp-leasefile=<path>
 Use the specified file to store DHCP lease information. If this option
 is given but no dhcp-range option is given then dnsmasq version 1

dnsmasq.conf.example

@@ -238,6 +238,9 @@ bogus-priv
 #dhcp-option=46,8           # netbios node type
 #dhcp-option=47             # empty netbios scope.
 
+# Send RFC-3397 DNS domain search DHCP option. WARNING: Your DHCP client
+# probably doesn't support this......
+#dhcp-option=119,eng.apple.com,marketing.apple.com 
 
 # Set the boot filename and tftpd server name and address
 # for BOOTP. You will only need this is you want to
@@ -252,6 +255,16 @@ bogus-priv
 # the line below.
 #dhcp-leasefile=/var/lib/misc/dnsmasq.leases
 
+# Set the DHCP server to authoritative mode. In this mode it will barge in 
+# and take over the lease for any client which broadcasts on the network, 
+# whether it has a record of the lease or not. This avoids long timeouts
+# when a machine wakes up on a new network. DO NOT enable this if there's 
+# the slighest chance that you might end up accidentally configuring a DHCP
+# server for your campus/company accidentally. The ISC server uses the same
+# the same option, and this URL provides more information:
+# http://www.isc.org/index.pl?/sw/dhcp/authoritative.php
+#dhcp-authoritative
+
 # Set the cachesize here.
 #cache-size=150
 

rpm/dnsmasq-SuSE.patch

 --- dnsmasq.8	2004-08-08 20:57:56.000000000 +0200
 +++ dnsmasq.8	2004-08-12 00:40:01.000000000 +0200
-@@ -63,7 +63,7 @@
+@@ -69,7 +69,7 @@
  .TP
  .B \-g, --group=<groupname> 
  Specify the group which dnsmasq will run
@@ -31,7 +31,7 @@
  #define IP6INTERFACES "/proc/net/if_inet6"
  #define UPTIME "/proc/uptime"
  #define DHCP_SERVER_PORT 67
-@@ -176,7 +176,7 @@
+@@ -187,7 +187,7 @@
  
  /* platform independent options. */
  #undef HAVE_BROKEN_RTC

src/config.h

@@ -12,7 +12,7 @@
 
 /* Author's email: simon@thekelleys.org.uk */
 
-#define VERSION "2.15"
+#define VERSION "2.16"
 
 #define FTABSIZ 150 /* max number of outstanding requests */
 #define MAX_PROCS 20 /* max no children for TCP requests */
@@ -156,7 +156,7 @@ HAVE_PSELECT
    If your C library implements pselect, define this.
 
 HAVE_BPF
-   If your OS implements Berkeley PAcket filter, define this.
+   If your OS implements Berkeley Packet filter, define this.
 
 NOTES:
    For Linux you should define 
@@ -176,10 +176,12 @@ NOTES:
    you should NOT define  
      HAVE_LINUX_IPV6_PROC 
    and you MAY define  
-     HAVE_ARC4RANDOM - OpenBSD and FreeBSD 
-     HAVE_DEV_URANDOM - OpenBSD and FreeBSD
-     HAVE_DEV_RANDOM - FreeBSD (OpenBSD with hardware random number generator)
-     HAVE_GETOPT_LONG - only if you link GNU getopt. 
+     HAVE_ARC4RANDOM - OpenBSD and FreeBSD and NetBSD version 2.0 or later
+     HAVE_DEV_URANDOM - OpenBSD and FreeBSD and NetBSD
+     HAVE_DEV_RANDOM - FreeBSD  and NetBSD 
+                       (OpenBSD with hardware random number generator)
+     HAVE_GETOPT_LONG - NetBSD 
+                       (FreeBSD and OpenBSD only if you link GNU getopt) 
 
 */
 
@@ -250,9 +252,6 @@ typedef unsigned long in_addr_t;
 #endif
 #endif
 
-/* #elif defined(__OpenBSD__)
-#error The sockets API in OpenBSD does not provide facilities required by dnsmasq
-*/
 #elif defined(__FreeBSD__) || defined(__OpenBSD__)
 #undef HAVE_LINUX_IPV6_PROC
 #undef HAVE_GETOPT_LONG
@@ -275,16 +274,16 @@ typedef unsigned long in_addr_t;
 #define BIND_8_COMPAT
 /* Define before sys/socket.h is included so we get socklen_t */
 #define _BSD_SOCKLEN_T_
-/* The three below are not defined in Mac OS X arpa/nameserv.h */
+/* This is not defined in Mac OS X arpa/nameserv.h */
 #define IN6ADDRSZ 16
  
 #elif defined(__NetBSD__)
 #undef HAVE_LINUX_IPV6_PROC
-#undef HAVE_GETOPT_LONG
+#define HAVE_GETOPT_LONG
 #undef HAVE_ARC4RANDOM
 #define HAVE_RANDOM
-#undef HAVE_DEV_URANDOM
-#undef HAVE_DEV_RANDOM
+#define HAVE_DEV_URANDOM
+#define HAVE_DEV_RANDOM
 #define HAVE_SOCKADDR_SA_LEN
 #undef HAVE_PSELECT
 #define HAVE_BPF

src/dhcp.c

@@ -18,13 +18,14 @@ void dhcp_init(struct daemon *daemon)
 {
   int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
   struct sockaddr_in saddr;
-  int oneopt = 1, zeroopt = 0;
+  int flags, oneopt = 1, zeroopt = 0;
   struct dhcp_config *configs, *cp;
 
   if (fd == -1)
     die ("cannot create DHCP socket : %s", NULL);
   
-  if (
+  if ((flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
 #if defined(IP_PKTINFO)
       setsockopt(fd, SOL_IP, IP_PKTINFO, &oneopt, sizeof(oneopt)) == -1 ||
 #elif defined(IP_RECVIF)
@@ -72,6 +73,8 @@ void dhcp_init(struct daemon *daemon)
      socket receive buffer size to one to avoid that. (zero is
      rejected as non-sensical by some BSD kernels) */
   if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IP))) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
       setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) == -1)
     die("cannot create DHCP packet socket: %s. "
 	"Is CONFIG_PACKET enabled in your kernel?", NULL);
@@ -160,7 +163,7 @@ void dhcp_packet(struct daemon *daemon, time_t now)
 #else
   {
     struct iname *name;
-    for (name = daemon->if_names; names->isloop; names = names->next);
+    for (name = daemon->if_names; name->isloop; name = name->next);
     strcpy(ifr.ifr_name, name->name);
   }
 #endif
@@ -257,7 +260,7 @@ void dhcp_packet(struct daemon *daemon, time_t now)
   lease_prune(NULL, now); /* lose any expired leases */
   newlen = dhcp_reply(daemon, iface_addr, ifr.ifr_name, sz, now);
   lease_update_file(0, now);
-  lease_update_dns();
+  lease_update_dns(daemon);
   
   if (newlen == 0)
     return;
@@ -283,7 +286,9 @@ void dhcp_packet(struct daemon *daemon, time_t now)
 	  dest.sin_addr = mess->ciaddr;
 	}
       
-      sendto(daemon->dhcpfd, mess, newlen, 0, (struct sockaddr *)&dest, sizeof(dest));
+      while(sendto(daemon->dhcpfd, mess, newlen, 0, 
+		   (struct sockaddr *)&dest, sizeof(dest)) == -1 &&
+	    retry_send());
     }
   else
     {
@@ -353,7 +358,8 @@ void dhcp_packet(struct daemon *daemon, time_t now)
 	iov[0].iov_len = sizeof(struct ether_header);
 	iov[1].iov_base = (char *)rawpacket;
 	iov[1].iov_len = ntohs(rawpacket->ip.ip_len);
-	writev(daemon->dhcp_raw_fd, iov, 2);
+	while (writev(daemon->dhcp_raw_fd, iov, 2) == -1 &&
+	       errno == EINTR);
 #else
 	struct sockaddr_ll dest;
 	
@@ -362,9 +368,9 @@ void dhcp_packet(struct daemon *daemon, time_t now)
 	dest.sll_ifindex = iface_index;
 	dest.sll_protocol = htons(ETHERTYPE_IP);
 	memcpy(dest.sll_addr, hwdest, ETHER_ADDR_LEN); 
-	sendto(daemon->dhcp_raw_fd, rawpacket, ntohs(rawpacket->ip.ip_len), 
-	       0, (struct sockaddr *)&dest, sizeof(dest));
-	
+	while (sendto(daemon->dhcp_raw_fd, rawpacket, ntohs(rawpacket->ip.ip_len), 
+		      0, (struct sockaddr *)&dest, sizeof(dest)) == -1 &&
+	       errno == EINTR);
 #endif
       }
     }
@@ -624,7 +630,7 @@ void dhcp_update_configs(struct dhcp_config *configs)
 	(crec = cache_find_by_name(NULL, config->hostname, 0, F_IPV4)) &&
 	(crec->flags & F_HOSTS))
       {
-	config->addr = crec->addr.addr.addr4;
+	config->addr = crec->addr.addr.addr.addr4;
 	config->flags |= CONFIG_ADDR;
       }
 }

src/dnsmasq.c

@@ -314,7 +314,7 @@ int main (int argc, char **argv)
 	      dhcp_update_configs(daemon->dhcp_conf);
 	      lease_update_from_configs(daemon->dhcp_conf, daemon->domain_suffix); 
 	      lease_update_file(0, now); 
-	      lease_update_dns();
+	      lease_update_dns(daemon);
 	    }
 	  if (daemon->resolv_files && (daemon->options & OPT_NO_POLL))
 	    {
@@ -326,7 +326,7 @@ int main (int argc, char **argv)
       
       if (sigusr1)
 	{
-	  dump_cache(daemon->options & (OPT_DEBUG | OPT_LOG), daemon->cachesize);
+	  dump_cache(daemon);
 	  sigusr1 = 0;
 	}
       
@@ -379,7 +379,7 @@ int main (int argc, char **argv)
 
 #ifdef HAVE_ISC_READER
 	  if (daemon->lease_file && !daemon->dhcp)
-	    load_dhcp(daemon->lease_file, daemon->domain_suffix, now, daemon->namebuff);
+	    load_dhcp(daemon, now);
 #endif
 
 	  if (!(daemon->options & OPT_NO_POLL))
@@ -638,8 +638,10 @@ int icmp_ping(struct daemon *daemon, struct in_addr addr)
   
   setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt));
 
-  if (sendto(daemon->dhcp_icmp_fd, (char *)&packet.icmp, sizeof(struct icmp), 0, 
-	     (struct sockaddr *)&saddr, sizeof(saddr)) == sizeof(struct icmp))
+  while (sendto(daemon->dhcp_icmp_fd, (char *)&packet.icmp, sizeof(struct icmp), 0, 
+		(struct sockaddr *)&saddr, sizeof(saddr)) == -1 &&
+	 retry_send());
+  
   for (now = start = dnsmasq_time(daemon->uptime_fd); difftime(now, start) < 3.0;)
     {
       struct timeval tv;

src/dnsmasq.h

@@ -95,6 +95,7 @@
 #define OPT_ETHERS         16384
 #define OPT_RESOLV_DOMAIN  32768
 #define OPT_NO_FORK        65536
+#define OPT_AUTHORITATIVE  131072
 
 struct all_addr {
   union {
@@ -129,7 +130,14 @@ union bigname {
 struct crec { 
   struct crec *next, *prev, *hash_next;
   time_t ttd; /* time to die */
+  int uid; 
+  union {
     struct all_addr addr;
+    struct {
+      struct crec *cache;
+      int uid;
+    } cname;
+  } addr;
   unsigned short flags;
   union {
     char sname[SMALLDNAME];
@@ -152,7 +160,7 @@ struct crec {
 #define F_SERVER    2048
 #define F_NXDOMAIN  4096
 #define F_QUERY     8192
-#define F_ADDN      16384
+#define F_CNAME     16384
 #define F_NOERR     32768
 
 /* struct sockaddr is not large enough to hold any address,
@@ -227,6 +235,13 @@ struct resolvc {
   char *name;
 };
 
+/* adn-hosts parms from command-line */
+struct hostsfile {
+  struct hostsfile *next;
+  char *fname;
+  int index; /* matches to cache entries fro logging */
+};
+
 struct frec {
   union mysockaddr source;
   struct all_addr dest;
@@ -234,6 +249,7 @@ struct frec {
   unsigned int iface;
   unsigned short orig_id, new_id;
   int fd;
+  unsigned int crc;
   time_t time;
   struct frec *next;
 };
@@ -340,7 +356,7 @@ struct daemon {
   int cachesize;
   int port, query_port;
   unsigned long local_ttl;
-  char *addn_hosts;
+  struct hostsfile *addn_hosts;
   struct dhcp_context *dhcp;
   struct dhcp_config *dhcp_conf;
   struct dhcp_opt *dhcp_opts;
@@ -369,7 +385,8 @@ struct daemon {
 
 /* cache.c */
 void cache_init(int cachesize, int log);
-void log_query(unsigned short flags, char *name, struct all_addr *addr, unsigned short type);
+void log_query(unsigned short flags, char *name, struct all_addr *addr, 
+	       unsigned short type, struct hostsfile *addn_hosts, int index);
 struct crec *cache_find_by_addr(struct crec *crecp,
 				struct all_addr *addr, time_t now, 
 				unsigned short prot);
@@ -377,12 +394,12 @@ struct crec *cache_find_by_name(struct crec *crecp,
 				char *name, time_t now, unsigned short  prot);
 void cache_end_insert(void);
 void cache_start_insert(void);
-void cache_insert(char *name, struct all_addr *addr,
+struct crec *cache_insert(char *name, struct all_addr *addr,
 			  time_t now, unsigned long ttl, unsigned short flags);
-void cache_reload(int opts, char *buff, char *domain_suffix, char *addn_hosts);
-void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd);
+void cache_reload(int opts, char *buff, char *domain_suffix, struct hostsfile  *addn_hosts);
+void cache_add_dhcp_entry(struct daemon *daemon, char *host_name, struct in_addr *host_address, time_t ttd);
 void cache_unhash_dhcp(void);
-void dump_cache(int debug, int size);
+void dump_cache(struct daemon *daemon);
 char *cache_get_name(struct crec *crecp);
 
 /* rfc1035.c */
@@ -392,14 +409,14 @@ int setup_reply(HEADER *header, unsigned int qlen,
 		struct all_addr *addrp, unsigned short flags,
 		unsigned long local_ttl);
 void extract_addresses(HEADER *header, unsigned int qlen, char *namebuff, 
-		       time_t now, struct doctor *doctors);
-void extract_neg_addrs(HEADER *header, unsigned int qlen, char *namebuff, time_t now, unsigned short flags);
+		       time_t now, struct daemon *daemon);
 int answer_request(HEADER *header, char *limit, unsigned int qlen, struct daemon *daemon, time_t now);
 int check_for_bogus_wildcard(HEADER *header, unsigned int qlen, char *name, 
 			     struct bogus_addr *addr, time_t now);
 unsigned char *find_pseudoheader(HEADER *header, unsigned int plen,
 				 unsigned int *len, unsigned char **p);
 int check_for_local_domain(char *name, time_t now, struct mx_record *mx);
+unsigned int questions_crc(HEADER *header, unsigned int plen);
 int resize_packet(HEADER *header, unsigned int plen, 
 		  unsigned char *pheader, unsigned int hlen);
 
@@ -417,6 +434,7 @@ int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
 int hostname_isequal(unsigned char *a, unsigned char *b);
 time_t dnsmasq_time(int fd);
 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
+int retry_send(void);
 
 /* option.c */
 struct daemon *read_opts (int argc, char **argv);
@@ -452,7 +470,7 @@ struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct i
 
 /* lease.c */
 void lease_update_file(int force, time_t now);
-void lease_update_dns(void);
+void lease_update_dns(struct daemon *daemon);
 void lease_init(struct daemon *daemon, time_t now);
 struct dhcp_lease *lease_allocate(unsigned char *clid, int clid_len, struct in_addr addr);
 void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr);
@@ -471,6 +489,6 @@ int icmp_ping(struct daemon *daemon, struct in_addr addr);
 
 /* isc.c */
 #ifdef HAVE_ISC_READER
-void load_dhcp(char *file, char *suffix, time_t now, char *hostname);
+void load_dhcp(struct daemon *daemon, time_t now);
 #endif
 

src/isc.c

@@ -55,8 +55,9 @@ static int next_token (char *token, int buffsize, FILE * fp)
   return count ? 1 : 0;
 }
 
-void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
+void load_dhcp(struct daemon *daemon, time_t now)
 {
+  char *hostname = daemon->namebuff;
   char token[MAXTOK], *dot;
   struct in_addr host_address;
   time_t ttd, tts;
@@ -64,10 +65,10 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
   struct isc_lease *lease, *tmp, **up;
   struct stat statbuf;
 
-  if (stat(file, &statbuf) == -1)
+  if (stat(daemon->lease_file, &statbuf) == -1)
     {
       if (!logged_lease)
-	syslog(LOG_WARNING, "failed to access %s: %m", file);
+	syslog(LOG_WARNING, "failed to access %s: %m", daemon->lease_file);
       logged_lease = 1;
       return;
     }
@@ -81,13 +82,13 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
   lease_file_size = statbuf.st_size;
   lease_file_inode = statbuf.st_ino;
   
-  if (!(fp = fopen (file, "r")))
+  if (!(fp = fopen (daemon->lease_file, "r")))
     {
-      syslog (LOG_ERR, "failed to load %s: %m", file);
+      syslog (LOG_ERR, "failed to load %s: %m", daemon->lease_file);
       return;
     }
   
-  syslog (LOG_INFO, "reading %s", file);
+  syslog (LOG_INFO, "reading %s", daemon->lease_file);
 
   while ((next_token(token, MAXTOK, fp)))
     {
@@ -109,7 +110,7 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
 			    if (!canonicalise(hostname))
 			      {
 				*hostname = 0;
-				syslog(LOG_ERR, "bad name in %s", file); 
+				syslog(LOG_ERR, "bad name in %s", daemon->lease_file); 
 			      }
 			}
                       else if ((strcmp(token, "ends") == 0) ||
@@ -168,7 +169,7 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
 
 		  if ((dot = strchr(hostname, '.')))
 		    { 
-		      if (!suffix || hostname_isequal(dot+1, suffix))
+		      if (!daemon->domain_suffix || hostname_isequal(dot+1, daemon->domain_suffix))
 			{
 			  syslog(LOG_WARNING, 
 				 "Ignoring DHCP lease for %s because it has an illegal domain part", 
@@ -198,11 +199,12 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
 			{
 			  leases = lease;
 			  strcpy(lease->name, hostname);
-			  if (suffix && (lease->fqdn = malloc(strlen(hostname) + strlen(suffix) + 2)))
+			  if (daemon->domain_suffix && 
+			      (lease->fqdn = malloc(strlen(hostname) + strlen(daemon->domain_suffix) + 2)))
 			    {
 			      strcpy(lease->fqdn, hostname);
 			      strcat(lease->fqdn, ".");
-			      strcat(lease->fqdn, suffix);
+			      strcat(lease->fqdn, daemon->domain_suffix);
 			    }
 			}
 		    }
@@ -235,8 +237,8 @@ void load_dhcp(char *file, char *suffix, time_t now, char *hostname)
 
   for (lease = leases; lease; lease = lease->next)
     {
-      cache_add_dhcp_entry(lease->fqdn, &lease->addr, lease->expires);
-      cache_add_dhcp_entry(lease->name, &lease->addr, lease->expires);
+      cache_add_dhcp_entry(daemon, lease->fqdn, &lease->addr, lease->expires);
+      cache_add_dhcp_entry(daemon, lease->name, &lease->addr, lease->expires);
     }
 }
 

src/lease.c

@@ -167,7 +167,7 @@ void lease_update_file(int force, time_t now)
     }
 }
 
-void lease_update_dns(void)
+void lease_update_dns(struct daemon *daemon)
 {
   struct dhcp_lease *lease;
   
@@ -177,8 +177,8 @@ void lease_update_dns(void)
       
       for (lease = leases; lease; lease = lease->next)
 	{
-	  cache_add_dhcp_entry(lease->fqdn, &lease->addr, lease->expires);
-	  cache_add_dhcp_entry(lease->hostname, &lease->addr, lease->expires);
+	  cache_add_dhcp_entry(daemon, lease->fqdn, &lease->addr, lease->expires);
+	  cache_add_dhcp_entry(daemon, lease->hostname, &lease->addr, lease->expires);
 	}
       
       dns_dirty = 0;

src/network.c

@@ -256,6 +256,8 @@ static int create_ipv6_listener(struct listener **link, int port)
       setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
       setsockopt(fd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
       setsockopt(tcpfd, IPV6_LEVEL, IPV6_V6ONLY, &opt, sizeof(opt)) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
       (flags = fcntl(tcpfd, F_GETFL, 0)) == -1 ||
       fcntl(tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
 #ifdef IPV6_RECVPKTINFO
@@ -321,6 +323,8 @@ struct listener *create_wildcard_listeners(int port)
       !create_ipv6_listener(&l6, port) ||
 #endif
       setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1 ||
+      (flags = fcntl(fd, F_GETFL, 0)) == -1 ||
+      fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
 #if defined(IP_PKTINFO) 
       setsockopt(fd, SOL_IP, IP_PKTINFO, &opt, sizeof(opt)) == -1 ||
 #elif defined(IP_RECVDSTADDR) && defined(IP_RECVIF)
@@ -373,6 +377,8 @@ struct listener *create_bound_listeners(struct irec *interfaces, int port)
 	    /* See Stevens 16.6 */
 	    (flags = fcntl(new->tcpfd, F_GETFL, 0)) == -1 ||
 	    fcntl(new->tcpfd, F_SETFL, flags | O_NONBLOCK) == -1 ||
+	    (flags = fcntl(new->fd, F_GETFL, 0)) == -1 ||
+	    fcntl(new->fd, F_SETFL, flags | O_NONBLOCK) == -1 ||
 	    bind(new->tcpfd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
 	    bind(new->fd, &iface->addr.sa, sa_len(&iface->addr)) == -1 ||
 	    listen(new->tcpfd, 5) == -1)
@@ -385,6 +391,7 @@ struct listener *create_bound_listeners(struct irec *interfaces, int port)
 struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
 {
   struct serverfd *sfd;
+  int flags;
 
   /* may have a suitable one already */
   for (sfd = *sfds; sfd; sfd = sfd->next )
@@ -402,7 +409,9 @@ struct serverfd *allocate_sfd(union mysockaddr *addr, struct serverfd **sfds)
       return NULL;
     }
   
-  if (bind(sfd->fd, (struct sockaddr *)addr, sa_len(addr)) == -1)
+  if (bind(sfd->fd, (struct sockaddr *)addr, sa_len(addr)) == -1 ||
+      (flags = fcntl(sfd->fd, F_GETFL, 0)) == -1 ||
+      fcntl(sfd->fd, F_SETFL, flags | O_NONBLOCK) == -1)
     {
       int errsave = errno; /* save error from bind. */
       close(sfd->fd);

src/option.c

@@ -21,7 +21,7 @@ struct myoption {
   int val;
 };
 
-#define OPTSTRING "ZDNLERzowefnbvhdkqr:m:p:c:l:s:i:t:u:g:a:x:S:C:A:T:H:Q:I:B:F:G:O:M:X:V:U:j:P:"
+#define OPTSTRING "ZDNLERKzowefnbvhdkqr:m:p:c:l:s:i:t:u:g:a:x:S:C:A:T:H:Q:I:B:F:G:O:M:X:V:U:j:P:"
 
 static struct myoption opts[] = { 
   {"version", 0, 0, 'v'},
@@ -74,6 +74,7 @@ static struct myoption opts[] = {
   {"dhcp-userclass", 1, 0, 'j'},
   {"edns-packet-max", 1, 0, 'P'},
   {"keep-in-foreground", 0, 0, 'k'},
+  {"dhcp-authoritative", 0, 0, 'K'},
   {0, 0, 0, 0}
 };
 
@@ -91,6 +92,7 @@ static struct optflags optmap[] = {
   { 'n', OPT_NO_POLL },
   { 'd', OPT_DEBUG },
   { 'k', OPT_NO_FORK },
+  { 'K', OPT_AUTHORITATIVE },
   { 'o', OPT_ORDER },
   { 'R', OPT_NO_RESOLV },
   { 'E', OPT_EXPAND },
@@ -127,6 +129,7 @@ static char *usage =
 "-I, --except-interface=int          Specify interface(s) NOT to listen on.\n"
 "-j, --dhcp-userclass=<id>,<class>   Map DHCP user class to option set.\n"
 "-k, --keep-in-foreground            Do NOT fork into the background, do NOT run in debug mode.\n"
+"-K, --dhcp-authoritative            Assume we are the only DHCP server on the local network.\n"
 "-l, --dhcp-leasefile=path           Specify where to store DHCP leases (defaults to " LEASEFILE ").\n"
 "-L, --localmx                       Return MX records for local hosts.\n"
 "-m, --mx-host=host_name             Specify the MX name to reply to.\n"
@@ -165,7 +168,7 @@ struct daemon *read_opts (int argc, char **argv)
   int option = 0, i;
   FILE *file_save = NULL, *f = NULL;
   char *file_name_save = NULL, *conffile = CONFFILE;
-  int conffile_set = 0;
+  int hosts_index = 1, conffile_set = 0;
   int line_save = 0, lineno = 0;
   opterr = 0;
   
@@ -398,14 +401,14 @@ struct daemon *read_opts (int argc, char **argv)
 	      break;
 	      
 	    case 'H':
-	      if (daemon->addn_hosts)
 	      {
-		  option = '?';
-		  problem = "only one addn hosts file allowed";
-		}
-	      else
-		daemon->addn_hosts = safe_string_alloc(optarg);
+		struct hostsfile *new = safe_malloc(sizeof(struct hostsfile));
+		new->fname = safe_string_alloc(optarg);
+		new->index = hosts_index++;
+		new->next = daemon->addn_hosts;
+		daemon->addn_hosts = new;
 		break;
+	      }
 
 	    case 's':
 	      if (strcmp (optarg, "#") == 0)
@@ -1009,10 +1012,11 @@ struct daemon *read_opts (int argc, char **argv)
 		new->len = 0;
 		new->is_addr = 0;
 		new->netid = NULL;
+		new->val = NULL;
 				
 		if ((comma = strchr(optarg, ',')))
 		  {
-		    *comma = 0;
+		    *comma++ = 0;
 		
 		    for (cp = optarg; *cp; cp++)
 		      if (!(*cp == ' ' || (*cp >='0' && *cp <= '9')))
@@ -1021,9 +1025,9 @@ struct daemon *read_opts (int argc, char **argv)
 		    if (*cp)
 		      {
 			new->netid = safe_string_alloc(optarg);
-			optarg = comma + 1;
+			optarg = comma;
 			if ((comma = strchr(optarg, ',')))
-			  *comma = 0;
+			  *comma++ = 0;
 		      }
 		  }
 		
@@ -1031,21 +1035,74 @@ struct daemon *read_opts (int argc, char **argv)
 		  {
 		    option = '?';
 		    problem = "bad dhcp-opt";
-		    if (new->netid)
-		      free(new->netid);
-		    free(new);
-		    break;
 		  }
+		else if (comma && new->opt == 119)
+		  {
+		    /* dns search, RFC 3397 */
+		    unsigned char *q, *r, *tail;
+		    unsigned char *p = NULL;
+		    int newlen, len = 0;
 		    
-		daemon->dhcp_opts = new;
+		    optarg = comma;
+		    if ((comma = strchr(optarg, ',')))
+		      *(comma++) = 0;
 
-		if (!comma)
+		    while (optarg && *optarg)
+		      {
+			if (!canonicalise(optarg))
+			  {
+			    option = '?';
+			    problem = "bad dhcp-search-opt";
 			    break;
+			  }
+			
+			if (!(r = realloc(p, len + strlen(optarg) + 2)))
+			  die("could not get memory", NULL);
+			p = memmove(r, p, len);
+			
+			q = p + len;
+			
+			/* add string on the end in RFC1035 format */
+			while (*optarg) 
+			  {
+			    char *cp = q++;
+			    int j;
+			    for (j = 0; *optarg && (*optarg != '.'); optarg++, j++)
+			      *q++ = *optarg;
+			    *cp = j;
+			    if (*optarg)
+			      optarg++;
+			  }
+			*q++ = 0;
 			
+			/* Now tail-compress using earlier names. */
+			newlen = q - p;
+			for (tail = p + len; *tail; tail += (*tail) + 1)
+			  for (r = p; r - p < len; r += (*r) + 1)
+			    if (strcmp(r, tail) == 0)
+			      {
+				PUTSHORT((r - p) | 0xc000, tail); 
+				newlen = tail - p;
+				goto end;
+			      }
+		      end:
+			len = newlen;
+		    
+			optarg = comma;
+			if (optarg && (comma = strchr(optarg, ',')))
+			  *(comma++) = 0;
+		      }
+
+		    new->len = len;
+		    new->val = p;
+		  }
+		else if (comma)
+		  {
+		    /* not option 119 */
 		    /* characterise the value */
 		    is_addr = is_hex = is_dec = 1;
 		    addrs = digs = 1;
-		for (cp = comma+1; *cp; cp++)
+		    for (cp = comma; *cp; cp++)
 		      if (*cp == ',')
 			{
 			  addrs++;
@@ -1068,7 +1125,7 @@ struct daemon *read_opts (int argc, char **argv)
 		
 		    if (is_hex && digs > 1)
 		      {
-		    char *p = comma+1, *q, *r;
+			char *p = comma, *q, *r;
 			new->len = digs;
 			q = new->val = safe_malloc(new->len);
 			while (*p)
@@ -1095,7 +1152,7 @@ struct daemon *read_opts (int argc, char **argv)
 		      {
 			/* Given that we don't know the length,
 			   this appaling hack is the best available */
-		    unsigned int val = atoi(comma+1);
+			unsigned int val = atoi(comma);
 			if (val < 256)
 			  {
 			    new->len = 1;
@@ -1129,9 +1186,9 @@ struct daemon *read_opts (int argc, char **argv)
 			while (addrs--) 
 			  {
 			    cp = comma;
-			if ((comma = strchr(cp+1, ',')))
-			  *comma = 0;
-			in.s_addr = inet_addr(cp+1);
+			    if ((comma = strchr(cp, ',')))
+			      *comma++ = 0;
+			    in.s_addr = inet_addr(cp);
 			    memcpy(op, &in, INADDRSZ);
 			    op += INADDRSZ;
 			  }
@@ -1139,10 +1196,29 @@ struct daemon *read_opts (int argc, char **argv)
 		    else
 		      {
 			/* text arg */
-		    new->len = strlen(comma+1);
+			new->len = strlen(comma);
 			new->val = safe_malloc(new->len);
-		    memcpy(new->val, comma+1, new->len);
+			memcpy(new->val, comma, new->len);
 		      }
+		  }
+
+		if (new->len > 256)
+		  {
+		    option = '?';
+		    problem = "dhcp-option too long";
+		  }
+
+		if (option == '?')
+		  {
+		    if (new->netid)
+		      free(new->netid);
+		    if (new->val)
+		      free(new->val);
+		    free(new);
+		  }
+		else
+		  daemon->dhcp_opts = new;
+
 		break;
 	      }
 

src/rfc2131.c

@@ -408,10 +408,12 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	  (iface_addr.s_addr != option_addr(opt).s_addr))
 	return 0;
       
-      log_packet("RELEASE", &mess->ciaddr, mess->chaddr, iface_name, NULL);
-
       if (lease && lease->addr.s_addr == mess->ciaddr.s_addr)
 	lease_prune(lease, now);
+      else
+	message = "unknown lease";
+
+      log_packet("RELEASE", &mess->ciaddr, mess->chaddr, iface_name, message);
 	
       return 0;
       
@@ -473,22 +475,14 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 		  lease_prune(lease, now);
 		  lease = NULL;
 		}
-	      
-	      if (!lease)
-		{ 
-		  if (lease_find_by_addr(mess->yiaddr))
-		    message = "address in use";
-		  else if (!(lease = lease_allocate(clid, clid_len, mess->yiaddr)))
-		    message = "no leases left";
-		} 
 	    }
 	  else
 	    {
 	      /* INIT-REBOOT */
-	      if (!lease)
+	      if (!lease && !(daemon->options & OPT_AUTHORITATIVE))
 		return 0;
 	      
-	      if (lease->addr.s_addr != mess->yiaddr.s_addr)
+	      if (lease && lease->addr.s_addr != mess->yiaddr.s_addr)
 		message = "wrong address";
 	    }
 	}
@@ -507,31 +501,40 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	  mess->yiaddr = mess->ciaddr;
 	}
       
+      log_packet("REQUEST", &mess->yiaddr, mess->chaddr, iface_name, NULL);
+      
       if (!message)
 	{
 	  struct dhcp_config *addr_config;
+
 	  /* If a machine moves networks whilst it has a lease, we catch that here. */
 	  if (!is_same_net(mess->yiaddr, context->start, context->netmask))
 	    message = "wrong network";
 
-	  /* Check for renewal of a lease which is now outside the allowed range. */
+	  /* Check for renewal of a lease which is outside the allowed range. */
 	  else if (!address_available(context, mess->yiaddr) &&
 		   (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr))
-	    message = "address no longer available";
+	    message = "address not available";
 
 	  /* Check if a new static address has been configured. Be very sure that
 	     when the client does DISCOVER, it will get the static address, otherwise
 	     an endless protocol loop will ensue. */
 	  
-	  else if (have_config(config, CONFIG_ADDR) && !lease_find_by_addr(config->addr))
+	  else if (have_config(config, CONFIG_ADDR) && 
+		   config->addr.s_addr != mess->yiaddr.s_addr &&
+		   (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease))
 	    message = "static lease available";
 
 	  /* Check to see if the address is reserved as a static address for another host */
 	  else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config)
 	    message ="address reserved";
-	}
 
-      log_packet("REQUEST", &mess->yiaddr, mess->chaddr, iface_name, NULL);
+	  else if ((ltmp = lease_find_by_addr(mess->yiaddr)) && ltmp != lease)
+	    message = "address in use";
+	  
+	  else if (!lease && !(lease = lease_allocate(clid, clid_len, mess->yiaddr)))
+	    message = "no leases left";
+	}
       
       if (message)
 	{
@@ -541,11 +544,10 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	  bootp_option_put(mess, NULL, NULL);
 	  p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK);
 	  p = option_put_string(p, end, OPTION_MESSAGE, message);
-	  p = option_end(p, end, mess);
 	  mess->flags |= htons(0x8000); /* broadcast */
-	  return p - (unsigned char *)mess;
 	}
-      
+      else
+	{
 	  log_packet("ACK", &mess->yiaddr, mess->chaddr, iface_name, hostname);
       
 	  lease_set_hwaddr(lease, mess->chaddr);
@@ -565,6 +567,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	    }
 	  p = do_req_options(context, p, end, req_options, daemon, 
 			     hostname, iface_addr, netid, subnet_addr);
+	}
+
       p = option_end(p, end, mess);
       return p - (unsigned char *)mess; 
       

src/util.c

@@ -251,3 +251,20 @@ int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask)
 {
   return (a.s_addr & mask.s_addr) == (b.s_addr & mask.s_addr);
 } 
+
+int retry_send(void)
+{
+   struct timespec waiter;
+   if (errno == EAGAIN)
+     {
+       waiter.tv_sec = 0;
+       waiter.tv_nsec = 10000;
+       nanosleep(&waiter, NULL);
+       return 1;
+     }
+   
+   if (errno == EINTR)
+     return 1;
+
+   return 0;
+}