cf6dbe48e0
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.
29 lines
782 B
Go
29 lines
782 B
Go
//go:build cgo && windows
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package netxlite
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//#include <ws2tcpip.h>
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import "C"
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import "syscall"
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const getaddrinfoAIFlags = C.AI_CANONNAME
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// Making constants available to Go code so we can run tests (it seems
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// it's not possible to import C directly in tests, sadly).
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const (
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aiCanonname = C.AI_CANONNAME
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)
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// toError is the function that converts the return value from
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// the getaddrinfo function into a proper Go error.
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func (state *getaddrinfoState) toError(code int64, err error, goos string) error {
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if err == nil {
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// Implementation note: on Windows getaddrinfo directly
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// returns what is basically a winsock2 error. So if there
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// is no other error, just cast code to a syscall err.
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err = syscall.Errno(code)
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}
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return newErrGetaddrinfo(int64(code), err)
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}
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