Description
There are a several of problems in udp_bind() that are triggered by using the -l (ell) flag.
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The 'addr' field only has space for IPv4 addresses but you attempt to call inet_pton(AF_INET6...). This corrupts the stack and coredumps the process on my machine.
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Even if an INET6 address could be parsed, you are hardcoding AF_INET everywhere else.
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The sin_len and sin_zero fields of sockaddr_in are not being set. One (or both) of these are now causing bind to consistently return errno 49 (can't assign requested address) in OpenBSD 5.6. This worked in 5.5, though I haven't figured out what changed.
3804 adsuck CALL socket(PF_INET,0x2<SOCK_DGRAM>,IPPROTO_IP)
3804 adsuck RET socket 3
3804 adsuck CALL bind(0x3,0xcfbc8594,0x10)
3804 adsuck STRU struct sockaddr { AF_INET, 127.0.0.1:53 }
3804 adsuck RET bind -1 errno 49 Can't assign requested address