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netxlite: call getaddrinfo and handle platform-specific oddities (#764)

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This commit changes our system resolver to call getaddrinfo directly when CGO is enabled. This change allows us to:

1. obtain the CNAME easily

2. obtain the real getaddrinfo retval

3. handle platform specific oddities such as `EAI_NODATA`
returned on Android devices

See https://github.com/ooni/probe/issues/2029 and https://github.com/ooni/probe/issues/2029#issuecomment-1140258729 in particular.

See https://github.com/ooni/probe/issues/2033 for documentation regarding the desire to see `getaddrinfo`'s retval.

See https://github.com/ooni/probe/issues/2118 for possible follow-up changes.
This commit is contained in:
Simone Basso 2022-05-28 15:10:30 +02:00 • committed by GitHub
commit cf6dbe48e0
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36 changed files with 1259 additions and 59 deletions
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8
internal/netxlite/errno_windows_test.go
View file

@ -1,5 +1,5 @@
// Code generated by go generate; DO NOT EDIT.
// Generated: 2022-05-19 20:30:45.733431 +0200 CEST m=+0.563360501
// Generated: 2022-05-28 13:27:22.067609692 +0200 CEST m=+0.308977732
package netxlite
@ -198,6 +198,12 @@ func TestClassifySyscallError(t *testing.T) {
}
})
t.Run("for WSAHOST_NOT_FOUND", func(t *testing.T) {
if v := classifySyscallError(windows.WSAHOST_NOT_FOUND); v != FailureDNSNXDOMAINError {
t.Fatalf("expected '%s', got '%s'", FailureDNSNXDOMAINError, v)
}
})
t.Run("for the zero errno value", func(t *testing.T) {
if v := classifySyscallError(syscall.Errno(0)); v != "" {
t.Fatalf("expected empty string, got '%s'", v)