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#!/usr/bin/env ucode
'use strict';
import { basename } from "fs";
let udebug = require("udebug");
let uloop = require("uloop");
let libubus = require("ubus");
uloop.init();
let ubus = libubus.connect();
let opts = {
select: []
};
const usage_message = `
Usage: ${basename(sourcepath())} [<options>] <command> [<args>]
Options:
-f Ignore errors on opening rings
-d <duration>: Only fetch data up to <duration> seconds old
-o <file>|- Set output file for snapshot/stream (or '-' for stdout)
-i <process>[:<name>] Select debug buffer for snapshot/stream
-s <path> Use udebug socket <path>
-q Suppress warnings/error messages
Commands:
list: List available debug buffers
snapshot: Create a pcapng snapshot of debug buffers
set_flag [<name>=0|1 ...] Set ring buffer flags
get_flags Get ring buffer flags
`;
function _warn(str) {
if (opts.quiet)
return;
warn(str);
}
function usage() {
warn(usage_message);
exit(1);
}
while (substr(ARGV[0], 0, 1) == "-") {
let opt = substr(shift(ARGV), 1);
switch(opt) {
case 'd':
opts.duration = +shift(ARGV);
break;
case 's':
opts.socket = shift(ARGV);
break;
case 'i':
push(opts.select, shift(ARGV));
break;
case 'o':
opts.output_file = shift(ARGV);
break;
case 'q':
opts.quiet = true;
break;
case 'f':
opts.force = true;
break;
default:
usage();
}
}
let procs = {};
let selected = [];
let rings = {};
let subscriber;
let pcap;
function ring_selected(ring) {
if (!length(opts.select))
return true;
for (let sel in opts.select) {
let match = split(sel, ":", 2);
if (wildcard(ring.proc_name, match[0]) &&
(!match[1] || wildcard(ring.ring_name, match[1])))
return true;
}
return false;
}
function poll_data() {
let data = [];
for (let ring_id in rings) {
let ring = rings[ring_id];
let s = ring[1].fetch();
if (s)
push(data, s);
}
if (length(data) > 0)
pcap.write(data);
}
function open_ring(ring, poll) {
let ring_name =` ${ring.proc_name}:${ring.ring_name}`;
let ref = udebug.get_ring(ring);
if (!ref)
return null;
if (opts.duration)
ref.set_fetch_duration(opts.duration);
if (poll)
ref.set_poll_cb(() => { poll_data() });
let ring_id = ring.id + "";
ring = [ ring_name, ref ];
rings[ring_id] = ring;
return ring;
}
function open_output() {
if (!opts.output_file) {
_warn(`No output file\n`);
exit(1);
}
let out = opts.output_file;
if (out == "-")
out = null;
pcap = udebug.pcap_file(out);
if (!pcap) {
_warn(`Failed to open output\n`);
exit(1);
}
}
let cmds = {
list: function() {
for (let proc in procs) {
print(`Process ${proc}:\n`);
for (let ring in procs[proc])
print(` - ${ring.ring_name}\n`);
}
},
snapshot: function() {
open_output();
if (!length(selected)) {
_warn(`No available debug buffers\n`);
exit(1);
}
for (let ring in selected) {
if (!open_ring(ring)) {
_warn(`Failed to open ring ${ring.proc_name}:${ring.ring_name}\n`);
if (opts.force)
continue;
exit(1);
}
}
poll_data();
pcap.close();
},
set_flag: function() {
for (let ring in selected) {
if (!length(ring.flags))
continue;
let mask = 0, set = 0;
for (let flag in ring.flags) {
for (let change in ARGV) {
change = split(change, "=", 2);
let name = change[0];
let val = !!int(change[1]);
if (flag[0] == name)
if (val)
set |= flag[1];
else
mask |= flag[1];
}
}
if (!(mask | set))
continue;
let r = open_ring(ring);
if (!r)
continue;
r[1].change_flags(mask, set);
}
},
get_flags: function() {
for (let ring in selected) {
if (!length(ring.flags))
continue;
let r = open_ring(ring);
if (!r)
continue;
print(`${r[0]}\n`);
let flags = r[1].get_flags();
for (let flag in ring.flags)
print(`\t${flag[0]}=${((flags & flag[1]) == flag[1]) ? 1 : 0 }\n`);
}
},
stream: function() {
open_output();
subscriber = ubus.subscriber((req) => {
let type = req.type;
let ring = req.data;
let ring_id = ring.id + "";
if (type == "remove") {
ring = rings[ring_id];
if (!ring)
return;
ring[1].close();
delete rings[ring_id];
} else if (type == "add") {
open_ring(ring, true);
poll_data();
}
});
subscriber.subscribe("udebug");
for (let ring in selected) {
if (!open_ring(ring, true)) {
_warn(`Failed to open ring ${ring_name}\n`);
if (opts.force)
continue;
exit(1);
}
}
let done = () => { uloop.end(); };
signal('SIGINT', done);
signal('SIGTERM', done);
poll_data();
delete opts.duration;
uloop.run();
}
};
let cmd = shift(ARGV);
if (!cmds[cmd])
usage();
let ring_list = ubus.call("udebug", "list");
if (!ring_list || !ring_list.results) {
warn("Failed to get ring buffer list from udebugd\n");
exit(1);
}
ring_list = ring_list.results;
for (let ring in ring_list) {
if (!ring_selected(ring))
continue;
let proc = procs[ring.proc_name];
if (!proc) {
proc = [];
procs[ring.proc_name] = proc;
}
push(proc, ring);
push(selected, ring);
}
if (cmd != "list" && !udebug.init(opts.socket)) {
_warn(`Failed to connect to udebug socket\n`);
exit(1);
}
cmds[cmd]();
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