Sync config from arch
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"""Who ended the last Wi-Fi association: the access point, this machine,
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or nobody (the link fell over).
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A BSSID change seen through `iw dev link` is only a fact: we were on one
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radio and now we are on another. Whether that was the client's decision,
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the access point's, or a link failure is the difference between a laptop
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that roams, a router that kicks, and a driver that drops — three problems
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with three owners, and the log used to call all of them "Roamed to".
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`iw event` is the unprivileged view of nl80211's mlme multicast group.
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Every deauthentication and disassociation frame the kernel sends or
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receives is reported with its sender, receiver and 802.11 reason code, and
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the authentication that follows is reported too. That is enough:
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- the frame's sender says who ended it — the AP's address means it kicked
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us, our own means this machine did;
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- the reason code says why, in the AP's or the driver's own words;
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- the delay before the next authentication says whether the client already
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knew where it was going. mac80211 emits the local deauth from inside the
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call that starts the new authentication when it roams, so a roam's gap is
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milliseconds; a lost link is followed by a scan first, and its gap is
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seconds.
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Only the kernel talks to this module, through `iw`. Lines are read with a
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length cap and matched against fixed patterns; two MACs and a reason code
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are the only fields kept, and only our own reason texts reach the shell.
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"""
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import re
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import shutil
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import subprocess
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import threading
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import time
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from collections import deque
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# `iw event -t` line: "<secs>.<usecs>: <ifname> (phy #N): <event...>". The
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# timestamp is CLOCK_REALTIME — the clock the daemon stamps with — and it
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# is optional so recorded fixtures read the same with or without it.
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_PREFIX = r"^(?:(\d+\.\d+): )?\S+(?: \(phy #\d+\))?: "
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_MAC = r"([0-9a-fA-F]{2}(?::[0-9a-fA-F]{2}){5})"
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_ANY_MAC = r"[0-9a-fA-F]{2}(?::[0-9a-fA-F]{2}){5}"
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# A deauth/disassoc frame: "<sender> -> <receiver> reason N: <text>".
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# "unprotected deauth" (a forged frame the kernel refused) does not match:
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# the frame word must follow the prefix directly.
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RE_FRAME = re.compile(_PREFIX + r"(deauth|disassoc) " + _MAC + " -> " + _MAC
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+ r" reason (\d{1,5})\b")
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# The first sign of the next association landing.
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RE_NEXT = re.compile(_PREFIX + r"(?:(?:auth|assoc) " + _ANY_MAC + " -> "
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+ _ANY_MAC + r" status: 0\b|(?:connected|roamed) to "
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+ _ANY_MAC + r"\b)")
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# 802.11 reason codes, in the words a person would use. Codes 3 and 4 mean
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# different things depending on who sent them, so they get a side each
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# (a GX gateway's per-station kick arrives as 8, for instance).
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REASONS = {
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1: "unspecified",
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2: "previous authentication no longer valid",
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5: "the AP is full",
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6: "class 2 frame from an unauthenticated station",
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7: "class 3 frame from an unassociated station",
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9: "not authenticated",
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14: "MIC failure",
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15: "4-way handshake timeout",
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16: "group key handshake timeout",
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17: "IE mismatch in the 4-way handshake",
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23: "802.1X authentication failed",
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34: "poor channel conditions",
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39: "timeout",
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}
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AP_REASONS = {3: "the AP is leaving", 4: "inactivity", 8: "the AP is leaving the BSS"}
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LOCAL_REASONS = {3: "leaving", 4: "beacon loss", 8: "leaving the BSS"}
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def reason_text(code, by_ap):
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"""'reason 2: previous authentication no longer valid'. Only our own
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words, never the tool's: nothing from the wire reaches the shell."""
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side = AP_REASONS if by_ap else LOCAL_REASONS
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text = side.get(code) or REASONS.get(code)
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return "reason %d: %s" % (code, text) if text else "reason %d" % code
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class NlEvents(threading.Thread):
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"""Runs `iw event` forever, restarting it if it dies, keeping the last
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few deauth/disassoc frames and when the next authentication followed.
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Like the probes, this never raises into the daemon: without `iw`, or
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when the socket is refused, the thread backs off and `cause_for`
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answers None — and the link log falls back to plain "Roamed to".
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"""
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MAX_CAUSES = 64
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LINE_CAP = 1024
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def __init__(self):
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super().__init__(name="nl-events", daemon=True)
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self._stop = threading.Event()
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self._proc = None
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self._lock = threading.Lock()
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self._causes = deque(maxlen=self.MAX_CAUSES)
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def stop(self):
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self._stop.set()
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proc = self._proc
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if proc and proc.poll() is None:
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try:
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proc.terminate()
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except OSError:
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pass
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def run(self):
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backoff = 1.0
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while not self._stop.is_set():
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if not shutil.which("iw"):
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time.sleep(min(backoff, 30.0))
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backoff = min(backoff * 2, 30.0)
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continue
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try:
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self._run_once()
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except Exception:
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pass # a spawn or parse failure is a retry, not a crash
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if not self._stop.is_set():
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# `iw event` never exits on its own; if it did, nl80211
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# refused us or the tool is broken — do not spin on it.
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time.sleep(min(backoff, 30.0))
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backoff = min(backoff * 2, 30.0)
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def _run_once(self):
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self._proc = subprocess.Popen(
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["iw", "event", "-t"], stdout=subprocess.PIPE,
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stderr=subprocess.DEVNULL, text=True, errors="replace", bufsize=1,
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)
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try:
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while not self._stop.is_set():
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# A capped read: an over-long line comes back in pieces
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# that match nothing, instead of growing a buffer.
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line = self._proc.stdout.readline(self.LINE_CAP)
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if not line:
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break
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self.consume(line)
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finally:
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proc, self._proc = self._proc, None
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if proc:
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try:
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proc.terminate()
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proc.wait(timeout=2)
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except subprocess.TimeoutExpired:
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# Would not go quietly: do not leave it running.
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try:
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proc.kill()
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proc.wait(timeout=2)
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except (OSError, subprocess.TimeoutExpired):
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pass
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except OSError:
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pass
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def consume(self, line: str, now: float = None):
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m = RE_FRAME.match(line)
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if m:
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t = float(m.group(1)) if m.group(1) else (now or time.time())
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with self._lock:
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self._causes.append({
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"t": t, "frame": m.group(2),
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"sa": m.group(3).lower(), "da": m.group(4).lower(),
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"reason": min(int(m.group(5)), 65535), "next_at": None,
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})
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return
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m = RE_NEXT.match(line)
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if m:
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t = float(m.group(1)) if m.group(1) else (now or time.time())
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with self._lock:
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# Only the newest cause is still waiting for its follow-up.
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if self._causes and self._causes[-1]["next_at"] is None:
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self._causes[-1]["next_at"] = t
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def cause_for(self, bssid: str, now: float, window: float):
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"""The latest frame within `window` seconds that ended our
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association with `bssid`, or None.
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by_ap: the AP sent it. gap_s: seconds until the next authentication
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was seen, None if none has been yet.
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"""
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bssid = (bssid or "").lower()
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if not bssid:
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return None
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with self._lock:
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for c in reversed(self._causes):
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if now - c["t"] > window:
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break
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if bssid not in (c["sa"], c["da"]):
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continue
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gap = None if c["next_at"] is None else max(0.0, c["next_at"] - c["t"])
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return {"t": c["t"], "frame": c["frame"], "by_ap": c["sa"] == bssid,
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"reason": c["reason"], "gap_s": gap}
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return None
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