33 lines
943 B
Go
33 lines
943 B
Go
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package ocicni
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import (
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"os/exec"
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"strings"
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"net"
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"fmt"
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)
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func getContainerIP(nsenterPath, netnsPath, interfaceName, addrType string) (net.IP, error) {
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// Try to retrieve ip inside container network namespace
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output, err := exec.Command(nsenterPath, fmt.Sprintf("--net=%s", netnsPath), "-F", "--",
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"ip", "-o", addrType, "addr", "show", "dev", interfaceName, "scope", "global").CombinedOutput()
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if err != nil {
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return nil, fmt.Errorf("Unexpected command output %s with error: %v", output, err)
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}
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lines := strings.Split(string(output), "\n")
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if len(lines) < 1 {
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return nil, fmt.Errorf("Unexpected command output %s", output)
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}
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fields := strings.Fields(lines[0])
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if len(fields) < 4 {
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return nil, fmt.Errorf("Unexpected address output %s ", lines[0])
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}
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ip, _, err := net.ParseCIDR(fields[3])
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if err != nil {
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return nil, fmt.Errorf("CNI failed to parse ip from output %s due to %v", output, err)
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}
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return ip, nil
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}
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