48 lines
1003 B
Go
48 lines
1003 B
Go
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package internal
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import (
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"bytes"
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"errors"
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"fmt"
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"strings"
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"github.com/cilium/ebpf/internal/unix"
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)
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// ErrorWithLog returns an error that includes logs from the
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// kernel verifier.
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//
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// logErr should be the error returned by the syscall that generated
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// the log. It is used to check for truncation of the output.
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func ErrorWithLog(err error, log []byte, logErr error) error {
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logStr := strings.Trim(CString(log), "\t\r\n ")
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if errors.Is(logErr, unix.ENOSPC) {
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logStr += " (truncated...)"
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}
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return &VerifierError{err, logStr}
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}
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// VerifierError includes information from the eBPF verifier.
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type VerifierError struct {
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cause error
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log string
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}
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func (le *VerifierError) Error() string {
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if le.log == "" {
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return le.cause.Error()
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}
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return fmt.Sprintf("%s: %s", le.cause, le.log)
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}
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// CString turns a NUL / zero terminated byte buffer into a string.
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func CString(in []byte) string {
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inLen := bytes.IndexByte(in, 0)
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if inLen == -1 {
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return ""
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}
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return string(in[:inLen])
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}
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