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David Crawshaw f414a9cc01 net/dns/resolver: EDNS OPT record off-by-one

I don't know how to get access to a real packet. Basing this commit
entirely off:

       +------------+--------------+------------------------------+
       | Field Name | Field Type   | Description                  |
       +------------+--------------+------------------------------+
       | NAME       | domain name  | MUST be 0 (root domain)      |
       | TYPE       | u_int16_t    | OPT (41)                     |
       | CLASS      | u_int16_t    | requestor's UDP payload size |
       | TTL        | u_int32_t    | extended RCODE and flags     |
       | RDLEN      | u_int16_t    | length of all RDATA          |
       | RDATA      | octet stream | {attribute,value} pairs      |
       +------------+--------------+------------------------------+

From https://datatracker.ietf.org/doc/html/rfc6891#section-6.1.2

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>

2021-07-27 16:39:27 -07:00

doh_test.go

net/dns/resolver: fall back to IPv6 for well-known DoH servers if v4 fails

2021-07-21 12:45:25 -07:00

forwarder.go

net/dns/resolver: EDNS OPT record off-by-one

2021-07-27 16:39:27 -07:00

macios_ext.go

net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS

2021-06-23 16:04:10 -07:00

neterr_darwin.go

net/dns/resolver: permit larger max responses, signal truncation