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net/dnsfallback: run recursive resolver and compare results

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When performing a fallback DNS query, run the recursive resolver in a
separate goroutine and compare the results returned by the recursive
resolver with the results we get from "regular" bootstrap DNS. This will
allow us to gather data about whether the recursive DNS resolver works
better, worse, or about the same as "regular" bootstrap DNS.

Updates #5853

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Ifa0b0cc9eeb0dccd6f7a3d91675fe44b3b34bd48
This commit is contained in:
Andrew Dunham
2023-06-13 10:53:36 -04:00
parent ffaa6be8a4
commit a7648a6723
3 changed files with 77 additions and 4 deletions
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cmd/tailscaled/depaware.txt
+3 -1
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@@ -118,6 +118,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
L github.com/mdlayher/netlink/nltest from github.com/google/nftables
L github.com/mdlayher/sdnotify from tailscale.com/util/systemd
L 💣 github.com/mdlayher/socket from github.com/mdlayher/netlink
github.com/miekg/dns from tailscale.com/net/dns/recursive
💣 github.com/mitchellh/go-ps from tailscale.com/safesocket
L github.com/pierrec/lz4/v4 from github.com/u-root/uio/uio
L github.com/pierrec/lz4/v4/internal/lz4block from github.com/pierrec/lz4/v4+
@@ -254,6 +255,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/connstats from tailscale.com/net/tstun+
tailscale.com/net/dns from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dns/publicdns from tailscale.com/net/dns/resolver+
tailscale.com/net/dns/recursive from tailscale.com/net/dnsfallback
tailscale.com/net/dns/resolvconffile from tailscale.com/net/dns+
tailscale.com/net/dns/resolver from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dnscache from tailscale.com/control/controlclient+
@@ -442,7 +444,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
embed from tailscale.com+
encoding from encoding/json+
encoding/asn1 from crypto/x509+
encoding/base32 from tailscale.com/tka
encoding/base32 from tailscale.com/tka+
encoding/base64 from encoding/json+
encoding/binary from compress/gzip+
encoding/hex from crypto/x509+