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import os
import subprocess
import Pyro5.api
class DmesgServer:
@Pyro5.api.expose
def dmesg(self):
# reading last 20 lines of the kernel's dmesg buffer... (requires root privilege)
try:
result = subprocess.check_output(["dmesg", "--nopager", "--level", "info"])
return result.decode().splitlines()[-20:]
except subprocess.SubprocessError as x:
raise OSError("couldn't run the dmesg command in the server: " + str(x))
if __name__ == "__main__":
print("Server is running as:")
print(" uid/gid", os.getuid(), os.getgid())
print(" euid/egid", os.geteuid(), os.getegid())
if os.getuid() != 0:
print("Warning: lacking root privileges to run the 'dmesg' command to read the kernel's buffer. "
"Executing the command will fail. For the desired outcome, run this program as root.")
else:
print("Running as root. This is okay as we're just running the 'dmesg' command for you.")
Pyro5.api.serve({
DmesgServer: "dmesg"
}, host="localhost", use_ns=False)
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