Nonterminals in server descriptors

nickname ::= between 1 and 19 alphanumeric characters ([A-Za-z0-9]), case-insensitive.

hexdigest ::= a ‘$’, followed by 40 hexadecimal characters ([A-Fa-f0-9]) encoding a relay’s SHA1(DER(KP_relayid_rsa)).

exitpattern ::= addrspec “:” portspec

portspec ::= “*” | port | port “-” port

port ::= an integer between 1 and 65535, inclusive.

(Some implementations incorrectly generate ports with value 0. Implementations SHOULD accept this, and SHOULD NOT generate it. Connections to port 0 are never permitted.)

addrspec ::= “*” | ip4spec | ip6spec

ipv4spec ::= ip4 | ip4 “/” num_ip4_bits | ip4 “/” ip4mask

ip4 ::= an IPv4 address in dotted-quad format

ip4mask ::= an IPv4 mask in dotted-quad format

num_ip4_bits ::= an integer between 0 and 32

ip6spec ::= ip6 | ip6 “/” num_ip6_bits

ip6 ::= an IPv6 address, surrounded by square brackets.

num_ip6_bits ::= an integer between 0 and 128

bool ::= “0” | “1”