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DBus support must be enabled at compile-time and run-time. Ensure that src/config.h contains the line #define HAVE_DBUS. and that /etc/dnsmasq.conf contains the line enable-dbus Because dnsmasq can operate stand-alone from the DBus, and may need to provide service before the dbus daemon is available, it will continue to run if the DBus connection is not available at startup. The DBus will be polled every 250ms until a connection is established. Start of polling and final connection establishment are both logged. When dnsmasq establishes a connection to the dbus, it sends the signal "Up". Anything controlling the server settings in dnsmasq should re-invoke the SetServers method (q.v.) when it sees this signal. This allows dnsmasq to be restarted and avoids startup races with the provider of nameserver information. Dnsmasq provides one service on the DBus: uk.org.thekelleys.dnsmasq and a single object: /uk/org/thekelleys/dnsmasq The name of the service may be changed by giving an argument to --enable-dbus. 1. METHODS ---------- Methods are of the form uk.org.thekelleys.<method> Available methods are: GetVersion ---------- Returns a string containing the version of dnsmasq running. ClearCache ---------- Returns nothing. Clears the domain name cache and re-reads /etc/hosts. The same as sending dnsmasq a HUP signal. SetFilterWin2KOption -------------------- Takes boolean, sets or resets the --filterwin2k option. SetBogusPrivOption ------------------ Takes boolean, sets or resets the --bogus-priv option. SetServers ---------- Returns nothing. Takes a set of arguments representing the new upstream DNS servers to be used by dnsmasq. IPv4 addresses are represented as a UINT32 (in network byte order) and IPv6 addresses are represented as sixteen BYTEs (since there is no UINT128 type). Each server address may be followed by one or more STRINGS, which are the domains for which the preceding server should be used. Examples. UINT32: <address1> UNIT32: <address2> is equivalent to --server=<address1> --server=<address2> UINT32 <address1> UINT32 <address2> STRING "somedomain.com" is equivalent to --server=<address1> --server=/somedomain.com/<address2> UINT32 <address1> UINT32 <address2> STRING "somedomain.com" UINT32 <address3> STRING "anotherdomain.com" STRING "thirddomain.com" is equivalent to --server=<address1> --server=/somedomain.com/<address2> --server=/anotherdomain.com/thirddomain.com/<address3> Am IPv4 address of 0.0.0.0 is interpreted as "no address, local only", so UINT32: <0.0.0.0> STRING "local.domain" is equivalent to --local=/local.domain/ Each call to SetServers completely replaces the set of servers specified by via the DBus, but it leaves any servers specified via the command line or /etc/dnsmasq.conf or /etc/resolv.conf alone. SetServersEx ------------ This function is more flexible and the SetServers function, in that it can handle address scoping, port numbers, and is easier for clients to use. Returns nothing. Takes a set of arguments representing the new upstream DNS servers to be used by dnsmasq. All addresses (both IPv4 and IPv6) are represented as STRINGS. Each server address may be followed by one or more STRINGS, which are the domains for which the preceding server should be used. This function takes an array of STRING arrays, where each inner array represents a set of DNS servers and domains for which those servers may be used. Each string represents a list of upstream DNS servers first, and domains second. Mixing of domains and servers within a the string array is not allowed. Examples. [ ["1.2.3.4", "foobar.com"], ["1003:1234:abcd::1%eth0", "eng.mycorp.com", "lab.mycorp.com"] ] is equivalent to --server=/foobar.com/1.2.3.4 \ --server=/eng.mycorp.com/lab.mycorp.com/1003:1234:abcd::1%eth0 An IPv4 address of 0.0.0.0 is interpreted as "no address, local only", so [ ["0.0.0.0", "local.domain"] ] is equivalent to --local=/local.domain/ Each call to SetServersEx completely replaces the set of servers specified by via the DBus, but it leaves any servers specified via the command line or /etc/dnsmasq.conf or /etc/resolv.conf alone. SetDomainServers ---------------- Yes another variation for setting DNS servers, with the capability of SetServersEx, but without using arrays of arrays, which are not sendable with dbus-send. The arguments are an array of strings which are identical to the equivalent arguments --server, so the example for SetServersEx is represented as [ "/foobar.com/1.2.3.4" "/eng.mycorp.com/lab.mycorp.com/1003:1234:abcd::1%eth0" ] GetLoopServers -------------- (Only available if dnsmasq compiled with HAVE_LOOP) Return an array of strings, each string is the IP address of an upstream server which has been found to loop queries back to this dnsmasq instance, and it therefore not being used. AddDhcpLease ------------ Returns nothing. Adds or updates a DHCP or DHCPv6 lease to the internal lease database, as if a client requested and obtained a lease. If a lease for the IPv4 or IPv6 address already exist, it is overwritten. Note that this function will trigger the DhcpLeaseAdded or DhcpLeaseUpdated D-Bus signal and will run the configured DHCP lease script accordingly. This function takes many arguments which are the lease parameters: - A string with the textual representation of the IPv4 or IPv6 address of the client. Examples: "192.168.1.115" "1003:1234:abcd::1%eth0" "2001:db8:abcd::1" - A string representing the hardware address of the client, using the same format as the one used in the lease database. Examples: "00:23:45:67:89:ab" "06-00:20:e0:3b:13:af" (token ring) - The hostname of the client, as an array of bytes (so there is no problem with non-ASCII character encoding). May be empty. Example (for "hostname.or.fqdn"): [104, 111, 115, 116, 110, 97, 109, 101, 46, 111, 114, 46, 102, 113, 100, 110] - The client identifier (IPv4) or DUID (IPv6) as an array of bytes. May be empty. Examples: DHCPv6 DUID: [0, 3, 0, 1, 0, 35, 69, 103, 137, 171] DHCPv4 client identifier: [255, 12, 34, 56, 78, 0, 1, 0, 1, 29, 9, 99, 190, 35, 69, 103, 137, 171] - The duration of the lease, in seconds. If the lease is updated, then the duration replaces the previous duration. Example: 7200 - The IAID (Identity association identifier) of the DHCPv6 lease, as a network byte-order unsigned integer. For DHCPv4 leases, this must be set to 0. Example (for IPv6): 203569230 - A boolean which, if true, indicates that the DHCPv6 lease is for a temporary address (IA_TA). If false, the DHCPv6 lease is for a non-temporary address (IA_NA). For DHCPv4 leases, this must be set to false. RemoveDhcpLease --------------- Returns nothing. Removes a DHCP or DHCPv6 lease to the internal lease database, as if a client sent a release message to abandon a lease. This function takes only one parameter: the text representation of the IPv4 or IPv6 address of the lease to remove. Note that this function will trigger the DhcpLeaseRemoved signal and the configured DHCP lease script will be run with the "del" action. 2. SIGNALS ---------- If dnsmasq's DHCP server is active, it will send signals over DBUS whenever the DHCP lease database changes. Think of these signals as transactions on a database with the IP address acting as the primary key. Signals are of the form: uk.org.thekelleys.<signal> and their parameters are: STRING "192.168.1.115" STRING "01:23:45:67:89:ab" STRING "hostname.or.fqdn" Available signals are: DhcpLeaseAdded --------------- This signal is emitted when a DHCP lease for a given IP address is created. DhcpLeaseDeleted ---------------- This signal is emitted when a DHCP lease for a given IP address is deleted. DhcpLeaseUpdated ---------------- This signal is emitted when a DHCP lease for a given IP address is updated.