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When `fctx_query()` is called, a DTrace probe (if enabled) prints the fetch context address, the upstream server address and port, and the latest known SRTT for the server.
29 lines
760 B
Text
Executable file
29 lines
760 B
Text
Executable file
#!/usr/bin/env stap
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#
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# resolver-trace.stp - trace resolver queries
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#
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# Prints every resolver query to an upstream DNS server, each trace is
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# identified by the fetch context. The trace contains the server IP, port and
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# SRTT value.
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#
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# Usage:
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# sudo stap resolver-trace.stp /path/to/named
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# sudo stap resolver-trace.stp /path/to/named -x <pid>
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#
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# Output columns: elapsed milliseconds, fetch context pointer, server socket
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# address and SRTT.
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global start_time
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probe begin {
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start_time = gettimeofday_ms()
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printf("%-10s %-16s %-46s %s\n", "ms", "fctx", "server", "SRTT")
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}
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probe process(@1).mark("resolver_query") {
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printf("%-10d %-16p %-46s %d\n",
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gettimeofday_ms() - start_time,
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$arg1,
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user_string($arg2),
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$arg3)
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}
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