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%%{
machine smtp_ip;
# Parses IPv4/IPv6 address
# Source: https://tools.ietf.org/html/rfc5321#section-4.1.3
Snum = digit{1,3};
IPv4_addr = (Snum ("." Snum){3});
IPv4_address_literal = IPv4_addr >IP4_start %IP4_end;
IPv6_hex = xdigit{1,4};
IPv6_full = IPv6_hex (":" IPv6_hex){7};
IPv6_comp = (IPv6_hex (":" IPv6_hex){0,5})? "::"
(IPv6_hex (":" IPv6_hex){0,5})?;
IPv6v4_full = IPv6_hex (":" IPv6_hex){5} ":" IPv4_address_literal;
IPv6v4_comp = (IPv6_hex (":" IPv6_hex){0,3})? "::"
(IPv6_hex (":" IPv6_hex){0,3} ":")?
IPv4_address_literal;
IPv6_simple = IPv6_full | IPv6_comp;
IPv6_addr = IPv6_simple | IPv6v4_full | IPv6v4_comp;
IPv6_address_literal = "IPv6:" %IP6_start IPv6_addr %IP6_end;
}%%
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