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cherry-pick: aghnet: imp host validation for system resolvers

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Updates #3022.

Squashed commit of the following:

commit 2f63b4e1765d9c9bfeadafcfa42c9d8741b628e1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 28 21:29:28 2021 +0300

    aghnet: fix doc

commit efdc1bb2c8959a9f888d558c32c415e6f3678b0c
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 28 21:19:54 2021 +0300

    all: doc changes

commit 8154797095874771bcf04d109644e6ae33fcb470
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 28 21:15:42 2021 +0300

    aghnet: imp host validation for system resolvers
This commit is contained in:
Ainar Garipov
2021-04-28 21:34:18 +03:00
committed by Ainar Garipov
parent 5b9bbce55d
commit d59938d254
4 changed files with 63 additions and 14 deletions
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12
internal/aghnet/systemresolvers.go
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@@ -26,11 +26,15 @@ type SystemResolvers interface {
}
const (
// fakeDialErr is an error which dialFunc is expected to return.
fakeDialErr agherr.Error = "this error signals the successful dialFunc work"
// errBadAddrPassed is returned when dialFunc can't parse an IP address.
errBadAddrPassed agherr.Error = "the passed string is not a valid IP address"
// badAddrPassedErr is returned when dialFunc can't parse an IP address.
badAddrPassedErr agherr.Error = "the passed string is not a valid IP address"
// errFakeDial is an error which dialFunc is expected to return.
errFakeDial agherr.Error = "this error signals the successful dialFunc work"
// errUnexpectedHostFormat is returned by validateDialedHost when the host has
// more than one percent sign.
errUnexpectedHostFormat agherr.Error = "unexpected host format"
)
// refreshWithTicker refreshes the cache of sr after each tick form tickCh.