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8fc7ac7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | # SPDX-License-Identifier: Apache-2.0
"""Fixed child used only to attest a fresh Linux network namespace.
The parent launches this file through ``unshare --net``. It performs no
network operation and accepts no command, expression, or package input.
"""
import json
import os
import sys
from pathlib import Path
def main() -> int:
if len(sys.argv) != 2:
return 64
target = Path(sys.argv[1])
interfaces = sorted(path.name for path in Path("/sys/class/net").iterdir())
loopback_state = None
state_path = Path("/sys/class/net/lo/operstate")
if state_path.is_file():
loopback_state = state_path.read_text(encoding="utf-8").strip()
payload = {
"schema": "szl.numerics.network-namespace-evidence/v1",
"network_operations_performed": 0,
"network_namespace": os.readlink("/proc/self/ns/net"),
"interfaces": interfaces,
"loopback_operstate": loopback_state,
}
target.write_text(
json.dumps(payload, sort_keys=True, separators=(",", ":"), ensure_ascii=False),
encoding="utf-8",
)
return 0
if __name__ == "__main__":
raise SystemExit(main())
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