tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

dhcp: make DHCP_OPTION_* enum public libsystemd-network provides the public function sd_dhcp_client_set_request_option() to enable the request of a given DHCP option. However the enum defining such options is defined in the internal header dhcp-protocol.h. Move the enum definition to the public header sd-dhcp-client.h and properly namespace values.

sd-dhcp: parse error message in DECLINE or NAK If a client sends a DECLINE or a server sends a NAK, they can include a string with a message to explain the error. Parse this and print it at debug level.

tree-wide: sort includes in *.h This is a continuation of the previous include sort patch, which only sorted for .c files.

libsystemd-network: add support for "Client FQDN" DHCP option This adds support for the Client Fully Qualified Domain Name (FQDN) option [RFC 4702] to libsystemd-network. The option can be used to exchange information about a DHCPv4 client's fully qualified domain name and about responsibility for updating the DNS RR related to the client's address assignment. Other popular DHCP clients (dhclient, dhcpcd) support this option and it would be useful to have it in networkd too.

dhcp,network: implement RFC 4833 (DHCP Timezone option) This one is simply to add: encode the tzdata timezone in the DHCP options and optionally make use of it.

networkd: add DHCP options for private zone

dhcp: add support for vendor specific DHCP option This adds support for option 43 (Vendor Specific Information) to libsystemd-network DHCP code. The option carries an opaque object of n octets, interpreted by vendor-specific code on the clients and servers. [@zonque: adopted to new unhexmem() API]

sd-dhcp-client: allow the max dhcp message size to be set to the MTU of the link

sd-dhcp-client: add support for FORCERENEW This partially implements RFC3203. Note that we are not fully compliant as we do not support authentication.

networkd: dhcp add vendor class indentifier option 60 Vendor Class Identifier be used by DHCP clients to identify their vendor type and configuration. When using this option, vendors can define their own specific identifier values, such as to convey a particular hardware or operating system configuration or other identifying information. Vendor-specified DHCP options—features that let administrators assign separate options to clients with similar configuration requirements. For example, if DHCP-aware clients for example we want to separate different gateway and option for different set of people (dev/test/hr/finance) in a org or devices for example web/database servers or let's say in a embedded device etc and require a different default gateway or DNS server than the rest of clients.

Add support for DHCP static route options This adds support for DHCP options 33 and 121: Static Route and Classless Static Route. To enable this feature, set UseRoutes=true in .network file. Returned routes are added to the routing table.

sd-dhcp: rely on FIONREAD working This fallback will anyway never get tested, so rip it out.

dhcp-lease: add support for parsing a few more dhcp options

sd-dhcp: refactor dhcp_option_append Store a pointer to the options in the DHCPMessage struct, and pass this together with an offset around, rather than a uint8_t**. This avoids us having to (re)compute the pointer; and changes dhcp_option_append from adjusting both the pointer to the next option and the remaining size of the options, to just adjusting the current offset. This makes the code a bit simpler to follow IMHO, but there should be no functional change.

sd-dhcp-client: Add an explicit stop state for the DHCP client Add an explicit stop state for the DHCP client so that the library user can issue a stop at any time the callback has been called. When returning from the callback, check also the stop state and stop any further DHCP processing.

sd-dhcp-client: move magic cookie into DHCPMessage struct Also move the checking of it to the main message handler, rather than the options parser. Fix a bug, so we now drop the packet if any of the magic bytes don't match. Before we used to only drop the packet if they were all wrong.

sd-dhcp-lease: add Root Path support This is necessary when mounting /dev/nfs based on a DHCP lease.

sd-network: add new library This is similar to sd-login, but exposes the state of networkd rather than logind. Include it in libsystemd-dhcp and rename it to libsystemd-network.