commit f090a2233c9180df6b606c1b598fe72a1ae5441c Author: teor teor@torproject.org Date: Tue Feb 4 14:16:17 2020 +1000
Prop 312: Explain address resolution using sockets
As suggested by Nick Mathewson.
Part of 33073. --- proposals/312-relay-auto-ipv6-addr.txt | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/proposals/312-relay-auto-ipv6-addr.txt b/proposals/312-relay-auto-ipv6-addr.txt index 98306c7..3209e0b 100644 --- a/proposals/312-relay-auto-ipv6-addr.txt +++ b/proposals/312-relay-auto-ipv6-addr.txt @@ -101,7 +101,7 @@ Ticket: #33073 1. the Address torrc option 2. the address of the hostname (resolved using DNS, if needed) 3. a local interface address - (by making a self-connected socket, if needed) + (by making an unused socket, if needed) 4. an address reported by a directory server (using X-Your-Address-Is)
When using the Address option, or the hostname, tor supports: @@ -147,7 +147,7 @@ Ticket: #33073 1. the Address torrc option 2. the advertised ORPort address 3. a local interface address - (by making a self-connected socket, if needed) + (by making an unused socket, if needed) 4. the address of the host's own hostname (resolved using DNS, if needed) 5. an address reported by a directory server (using X-Your-Address-Is)
@@ -275,10 +275,11 @@ Ticket: #33073 online, except for short quotes (see [getaddrinfo man page] for the relevant quote).
- If the local interface addresses are unavailable, tor opens a self-connected - UDP socket to a publicly routable address, but doesn't actually send any - packets. Instead, it uses the socket APIs to discover the interface address - for the socket. + If the local interface addresses are unavailable, tor opens a UDP socket to + a publicly routable address, but doesn't actually send any packets. + Instead, it uses the socket APIs to discover the interface address for the + socket. (UDP is used because it is stateless, so the OS will not send any + packets to open a connection.)
Relays that use NAT to reach the Internet may have no publicly routable local interface addresses, even on the public tor network. The NAT box has