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udhcpd: note missing sanity checks on INFORM message handling
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -247,11 +247,23 @@ static void send_inform(struct dhcp_packet *oldpacket)
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{
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struct dhcp_packet packet;
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/* "The server responds to a DHCPINFORM message by sending a DHCPACK
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/* "If a client has obtained a network address through some other means
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* (e.g., manual configuration), it may use a DHCPINFORM request message
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* to obtain other local configuration parameters. Servers receiving a
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* DHCPINFORM message construct a DHCPACK message with any local
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* configuration parameters appropriate for the client without:
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* allocating a new address, checking for an existing binding, filling
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* in 'yiaddr' or including lease time parameters. The servers SHOULD
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* unicast the DHCPACK reply to the address given in the 'ciaddr' field
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* of the DHCPINFORM message.
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* ...
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* The server responds to a DHCPINFORM message by sending a DHCPACK
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* message directly to the address given in the 'ciaddr' field
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* of the DHCPINFORM message. The server MUST NOT send a lease
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* expiration time to the client and SHOULD NOT fill in 'yiaddr'."
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*/
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//TODO: do a few sanity checks: is ciaddr set?
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//Better yet: is ciaddr == IP source addr?
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init_packet(&packet, oldpacket, DHCPACK);
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add_server_options(&packet);
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