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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,39 @@ | ||
//go:build !windows | ||
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package dns | ||
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import ( | ||
"fmt" | ||
"os" | ||
"regexp" | ||
) | ||
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var ( | ||
// nameserver xxx.xxx.xxx.xxx | ||
nameserverPattern = regexp.MustCompile(`nameserver\s+(?P<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})`) | ||
) | ||
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func loadSystemResolver() (clients []dnsClient, err error) { | ||
content, err := os.ReadFile("/etc/resolv.conf") | ||
if err != nil { | ||
err = fmt.Errorf("failed to read /etc/resolv.conf: %w", err) | ||
return | ||
} | ||
nameservers := make([]string, 0) | ||
for _, line := range nameserverPattern.FindAllStringSubmatch(string(content), -1) { | ||
addr := line[1] | ||
nameservers = append(nameservers, addr) | ||
} | ||
if len(nameservers) == 0 { | ||
err = fmt.Errorf("no nameserver found in /etc/resolv.conf") | ||
return | ||
} | ||
servers := make([]NameServer, 0, len(nameservers)) | ||
for _, addr := range nameservers { | ||
servers = append(servers, NameServer{ | ||
Addr: fmt.Sprintf("%s:%d", addr, 53), | ||
Net: "udp", | ||
}) | ||
} | ||
return transform(servers, nil), nil | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,7 @@ | ||
//go:build windows | ||
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package dns | ||
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func loadSystemResolver() (clients []dnsClient, err error) { | ||
return nil, errors.New("system resolver is not yet supported on Windows") | ||
} |
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