a536ab821b
o improve parsing and lexing o create data structures based on the parsed file now. o Still need to rewrite main loop and add regex (still uses hard coded devd-generic) o minor man page updates. # There should be one more commit before rc2 Approved by: re (blanket)
592 lines
11 KiB
C++
592 lines
11 KiB
C++
/*-
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* Copyright (c) 2002 M. Warner Losh.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* DEVD control daemon.
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*/
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// TODO list:
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// o rewrite the main loop:
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// - expand variables
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// - find best match
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// - execute it.
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// o need to insert the event_proc structures in order of priority.
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// bigger numbers mean higher priority.
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// o devd.conf and devd man pages need a lot of help:
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// - devd.conf needs to lose the warning about zone files.
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// - devd.conf needs more details on the supported statements.
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// - devd.conf needs an example or two.
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <map>
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#include <string>
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#include <vector>
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#include "devd.h"
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#define CF "/etc/devd.conf"
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using namespace std;
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extern FILE *yyin;
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extern int lineno;
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int dflag;
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int romeo_must_die = 0;
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static void event_loop(void);
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static void usage(void);
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class config;
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class var_list
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{
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public:
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var_list() {}
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virtual ~var_list() {}
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void set_variable(const string &var, const string &val);
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const string &get_variable(const string &var) const;
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bool is_set(const string &var) const;
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static const string bogus;
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static const string nothing;
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private:
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map<string, string> _vars;
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};
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class eps
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{
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public:
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eps() {}
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virtual ~eps() {}
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virtual bool do_match(config &) = 0;
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virtual bool do_action(config &) = 0;
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};
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class match : public eps
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{
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public:
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match(const char *var, const char *re);
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virtual ~match();
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virtual bool do_match(config &);
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virtual bool do_action(config &) { return true; }
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private:
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string _var;
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string _re;
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};
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class action : public eps
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{
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public:
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action(const char *cmd);
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virtual ~action();
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virtual bool do_match(config &) { return true; }
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virtual bool do_action(config &);
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private:
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string _cmd;
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};
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class event_proc
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{
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public:
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event_proc();
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virtual ~event_proc();
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int get_priority() { return (_prio); }
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void set_priority(int prio) { _prio = prio; }
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void add(eps *);
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bool matches(config &);
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bool run(config &);
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private:
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int _prio;
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vector<eps *> _epsvec;
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};
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class config
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{
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public:
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config() : _pidfile("") { push_var_table(); }
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virtual ~config() { reset(); }
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void add_attach(int, event_proc *);
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void add_detach(int, event_proc *);
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void add_directory(const char *);
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void add_nomatch(int, event_proc *);
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void set_pidfile(const char *);
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void reset();
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void parse();
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void drop_pidfile();
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void push_var_table();
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void pop_var_table();
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void set_variable(const char *var, const char *val);
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const string &get_variable(const string &var);
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const string &expand_string(const string &var);
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protected:
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void parse_one_file(const char *fn);
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void parse_files_in_dir(const char *dirname);
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private:
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vector<string> _dir_list;
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string _pidfile;
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vector<var_list *> _var_list_table;
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vector<event_proc *> _attach_list;
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vector<event_proc *> _detach_list;
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vector<event_proc *> _nomatch_list;
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};
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config cfg;
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event_proc::event_proc() : _prio(-1)
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{
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// nothing
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}
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event_proc::~event_proc()
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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delete *i;
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_epsvec.clear();
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}
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void
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event_proc::add(eps *eps)
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{
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_epsvec.push_back(eps);
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}
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bool
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event_proc::matches(config &c)
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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if (!(*i)->do_match(c))
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return (false);
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return (true);
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}
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bool
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event_proc::run(config &c)
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{
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vector<eps *>::const_iterator i;
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for (i = _epsvec.begin(); i != _epsvec.end(); i++)
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if (!(*i)->do_action(c))
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return (false);
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return (true);
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}
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action::action(const char *cmd)
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: _cmd(cmd)
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{
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// nothing
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}
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action::~action()
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{
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// nothing
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}
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bool
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action::do_action(config &)
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{
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// this is lame because we don't expand variables.
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// xxx
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::system(_cmd.c_str());
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return (true);
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}
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match::match(const char *var, const char *re)
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: _var(var), _re(re)
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{
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// nothing
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}
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match::~match()
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{
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// nothing
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}
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bool
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match::do_match(config &)
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{
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// XXX
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return false;
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}
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const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
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const string var_list::nothing = "";
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const string &
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var_list::get_variable(const string &var) const
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{
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map<string, string>::const_iterator i;
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i = _vars.find(var);
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if (i == _vars.end())
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return var_list::bogus;
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return (i->second);
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}
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bool
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var_list::is_set(const string &var) const
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{
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return (_vars.find(var) != _vars.end());
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}
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void
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var_list::set_variable(const string &var, const string &val)
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{
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_vars[var] = val;
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}
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void
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config::reset(void)
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{
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_dir_list.clear();
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_var_list_table.clear();
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// XXX need to cleanup _{attach,detach,nomatch}_list
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}
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void
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config::parse_one_file(const char *fn)
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{
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if (dflag)
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printf("Parsing %s\n", fn);
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yyin = fopen(fn, "r");
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if (yyin == NULL)
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err(1, "Cannot open config file %s", fn);
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if (yyparse() != 0)
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errx(1, "Cannot parse %s at line %d", fn, lineno);
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fclose(yyin);
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}
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void
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config::parse_files_in_dir(const char *dirname)
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{
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DIR *dirp;
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struct dirent *dp;
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char path[PATH_MAX];
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if (dflag)
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printf("Parsing files in %s\n", dirname);
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dirp = opendir(dirname);
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if (dirp == NULL)
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return;
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readdir(dirp); /* Skip . */
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readdir(dirp); /* Skip .. */
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while ((dp = readdir(dirp)) != NULL) {
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if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) {
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snprintf(path, sizeof(path), "%s/%s",
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dirname, dp->d_name);
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parse_one_file(path);
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}
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}
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}
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void
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config::parse(void)
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{
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vector<string>::const_iterator i;
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parse_one_file(CF);
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for (i = _dir_list.begin(); i != _dir_list.end(); i++)
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parse_files_in_dir((*i).c_str());
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}
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void
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config::drop_pidfile()
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{
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FILE *fp;
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if (_pidfile == "")
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return;
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fp = fopen(_pidfile.c_str(), "w");
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if (fp == NULL)
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return;
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fprintf(fp, "%d\n", getpid());
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fclose(fp);
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}
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void
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config::add_attach(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_attach_list.push_back(p);
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}
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void
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config::add_detach(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_detach_list.push_back(p);
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}
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void
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config::add_directory(const char *dir)
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{
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_dir_list.push_back(string(dir));
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}
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void
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config::add_nomatch(int prio, event_proc *p)
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{
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p->set_priority(prio);
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_nomatch_list.push_back(p);
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}
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void
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config::set_pidfile(const char *fn)
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{
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_pidfile = string(fn);
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}
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void
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config::push_var_table()
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{
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var_list *vl;
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vl = new var_list();
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_var_list_table.push_back(vl);
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}
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void
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config::pop_var_table()
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{
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delete _var_list_table.back();
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_var_list_table.pop_back();
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}
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void
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config::set_variable(const char *var, const char *val)
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{
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_var_list_table.back()->set_variable(var, val);
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}
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const string &
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config::get_variable(const string &var)
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{
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vector<var_list *>::reverse_iterator i;
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for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); i++) {
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if ((*i)->is_set(var))
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return (var);
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}
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return (var_list::nothing);
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}
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const string &
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config::expand_string(const string &)
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{
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return var_list::bogus;
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}
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static void
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process_event(const char *buffer)
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{
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char type;
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char cmd[1024];
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char *sp;
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// XXX should involve config
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// XXX and set some variables
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// XXX run the list and so forth
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// Ignore unknown devices for now.
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if (*buffer == '?')
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return;
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type = *buffer++;
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sp = strchr(buffer, ' ');
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if (sp == NULL)
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return; /* Can't happen? */
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*sp = '\0';
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snprintf(cmd, sizeof(cmd), "/etc/devd-generic %s %s", buffer,
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type == '+' ? "start" : "stop");
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if (dflag)
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printf("Trying '%s'\n", cmd);
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system(cmd);
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}
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static void
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event_loop(void)
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{
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int rv;
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int fd;
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char buffer[DEVCTL_MAXBUF];
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fd = open(PATH_DEVCTL, O_RDONLY);
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if (fd == -1)
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err(1, "Can't open devctl");
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
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err(1, "Can't set close-on-exec flag");
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while (1) {
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if (romeo_must_die)
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break;
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rv = read(fd, buffer, sizeof(buffer) - 1);
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if (rv > 0) {
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buffer[rv] = '\0';
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while (buffer[--rv] == '\n')
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buffer[rv] = '\0';
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process_event(buffer);
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} else if (rv < 0) {
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if (errno != EINTR)
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break;
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} else {
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/* EOF */
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break;
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}
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}
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close(fd);
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}
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/*
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* functions that the parser uses.
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*/
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void
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add_attach(int prio, event_proc *p)
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{
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cfg.add_attach(prio, p);
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}
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void
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add_detach(int prio, event_proc *p)
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{
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cfg.add_detach(prio, p);
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}
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void
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add_directory(const char *dir)
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{
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cfg.add_directory(dir);
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free(const_cast<char *>(dir));
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}
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void
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add_nomatch(int prio, event_proc *p)
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{
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cfg.add_nomatch(prio, p);
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}
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event_proc *
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add_to_event_proc(event_proc *ep, eps *eps)
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{
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if (ep == NULL)
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ep = new event_proc();
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ep->add(eps);
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return (ep);
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}
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eps *
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new_action(const char *cmd)
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{
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eps *e = new action(cmd);
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free(const_cast<char *>(cmd));
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return (e);
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}
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eps *
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new_match(const char *var, const char *re)
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{
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eps *e = new match(var, re);
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free(const_cast<char *>(var));
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free(const_cast<char *>(re));
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return (e);
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}
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void
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set_pidfile(const char *name)
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{
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cfg.set_pidfile(name);
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free(const_cast<char *>(name));
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}
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void
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set_variable(const char *var, const char *val)
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{
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cfg.set_variable(var, val);
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free(const_cast<char *>(var));
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free(const_cast<char *>(val));
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}
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static void
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gensighand(int)
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{
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romeo_must_die++;
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_exit(0);
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}
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static void
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usage()
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{
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fprintf(stderr, "usage: %s [-d]", getprogname());
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exit(1);
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}
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/*
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* main
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*/
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int
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main(int argc, char **argv)
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{
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int ch;
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while ((ch = getopt(argc, argv, "d")) != -1) {
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switch (ch) {
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case 'd':
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dflag++;
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break;
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default:
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usage();
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}
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}
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cfg.parse();
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if (!dflag)
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daemon(0, 0);
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cfg.drop_pidfile();
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signal(SIGHUP, gensighand);
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signal(SIGINT, gensighand);
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signal(SIGTERM, gensighand);
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event_loop();
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return (0);
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}
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