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Otherwise we would get a nullptr dereference later on.
Found by coverity. Fixes CID #1237655.
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The magic cookie is set in dhcp_message_init. Test the magic cookie
value intead of writing the last 3/4 of it directly.
Found with Coverity. Fixes: CID#1237732 CID#1237734 CID#1237735
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for END
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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.
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This test should have been updated when changing the magic cookie handling around.
Reported by Ken MacLeod.
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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.
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