804 lines
14 KiB
C++
804 lines
14 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 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 <ctype.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 <regex.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 <algorithm>
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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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static const char nomatch = '?';
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static const char attach = '+';
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static const char detach = '-';
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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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template <class T> void
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delete_and_clear(vector<T *> &v)
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{
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typename vector<T *>::const_iterator i;
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for (i = v.begin(); i != v.end(); i++)
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delete *i;
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v.clear();
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}
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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(config &, 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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regex_t _regex;
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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() const { 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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char *set_vars(char *);
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void find_and_execute(char);
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protected:
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void sort_vector(vector<event_proc *> &);
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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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void expand_one(const char *&src, char *&dst, char *eod);
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bool is_id_char(char);
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bool chop_var(char *&buffer, char *&lhs, char *&rhs);
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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 &c)
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{
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string s = c.expand_string(_cmd);
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if (dflag)
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fprintf(stderr, "Executing '%s'\n", s.c_str());
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::system(s.c_str());
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return (true);
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}
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match::match(config &c, const char *var, const char *re)
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: _var(var)
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{
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string pattern = re;
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_re = "^";
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_re.append(c.expand_string(string(re)));
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_re.append("$");
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regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB);
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}
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match::~match()
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{
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regfree(&_regex);
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}
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bool
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match::do_match(config &c)
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{
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string value = c.get_variable(_var);
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bool retval;
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if (dflag)
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fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
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value.c_str(), _re.c_str());
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retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
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return retval;
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}
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const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_";
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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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if (dflag)
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fprintf(stderr, "%s=%s\n", var.c_str(), val.c_str());
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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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delete_and_clear(_var_list_table);
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delete_and_clear(_attach_list);
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delete_and_clear(_detach_list);
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delete_and_clear(_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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class epv_greater {
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public:
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int operator()(event_proc *const&l1, event_proc *const&l2)
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{
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return (l1->get_priority() > l2->get_priority());
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}
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};
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void
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config::sort_vector(vector<event_proc *> &v)
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{
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sort(v.begin(), v.end(), epv_greater());
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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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sort_vector(_attach_list);
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sort_vector(_detach_list);
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sort_vector(_nomatch_list);
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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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if (dflag)
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fprintf(stderr, "Pushing table\n");
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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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if (dflag)
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fprintf(stderr, "Popping table\n");
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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 ((*i)->get_variable(var));
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}
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return (var_list::nothing);
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}
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bool
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config::is_id_char(char ch)
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{
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return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' ||
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ch == '-'));
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}
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// XXX
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// imp should learn how to make effective use of the string class.
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void
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config::expand_one(const char *&src, char *&dst, char *)
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{
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int count;
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const char *var;
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char buffer[1024];
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string varstr;
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src++;
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// $$ -> $
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if (*src == '$') {
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*dst++ = *src++;
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return;
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}
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// $(foo) -> $(foo)
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// Not sure if I want to support this or not, so for now we just pass
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// it through.
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if (*src == '(') {
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*dst++ = '$';
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count = 1;
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while (count > 0) {
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if (*src == ')')
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count--;
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else if (*src == '(')
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count++;
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*dst++ = *src++;
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}
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return;
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}
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// ${^A-Za-z] -> $\1
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if (!isalpha(*src)) {
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*dst++ = '$';
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*dst++ = *src++;
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return;
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}
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// $var -> replace with value
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var = src++;
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while (is_id_char(*src))
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src++;
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memcpy(buffer, var, src - var);
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buffer[src - var] = '\0';
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varstr = get_variable(buffer);
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strcpy(dst, varstr.c_str());
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dst += strlen(dst);
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}
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const string
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config::expand_string(const string &s)
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{
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const char *src;
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char *dst;
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char buffer[1024];
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src = s.c_str();
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dst = buffer;
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while (*src) {
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if (*src == '$')
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expand_one(src, dst, buffer + sizeof(buffer));
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else
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*dst++ = *src++;
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}
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*dst++ = '\0';
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return (buffer);
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}
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bool
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config::chop_var(char *&buffer, char *&lhs, char *&rhs)
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{
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char *walker;
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if (*buffer == '\0')
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return (false);
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walker = lhs = buffer;
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while (is_id_char(*walker))
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walker++;
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if (*walker != '=')
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return (false);
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walker++; // skip =
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if (*walker == '"') {
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walker++; // skip "
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rhs = walker;
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while (*walker && *walker != '"')
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walker++;
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if (*walker != '"')
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return (false);
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rhs[-2] = '\0';
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*walker++ = '\0';
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} else {
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rhs = walker;
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while (*walker && !isspace(*walker))
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walker++;
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if (*walker != '\0')
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*walker++ = '\0';
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rhs[-1] = '\0';
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}
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buffer = walker;
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return (true);
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}
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char *
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config::set_vars(char *buffer)
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{
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char *lhs;
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char *rhs;
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while (1) {
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if (!chop_var(buffer, lhs, rhs))
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break;
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set_variable(lhs, rhs);
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}
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return (buffer);
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}
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void
|
||
config::find_and_execute(char type)
|
||
{
|
||
vector<event_proc *> *l;
|
||
vector<event_proc *>::const_iterator i;
|
||
char *s;
|
||
|
||
switch (type) {
|
||
default:
|
||
return;
|
||
case nomatch:
|
||
l = &_nomatch_list;
|
||
s = "nomatch";
|
||
break;
|
||
case attach:
|
||
l = &_attach_list;
|
||
s = "attach";
|
||
break;
|
||
case detach:
|
||
l = &_detach_list;
|
||
s = "detach";
|
||
break;
|
||
}
|
||
if (dflag)
|
||
fprintf(stderr, "Processing %s event\n", s);
|
||
for (i = l->begin(); i != l->end(); i++) {
|
||
if ((*i)->matches(*this)) {
|
||
(*i)->run(*this);
|
||
break;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
|
||
static void
|
||
process_event(char *buffer)
|
||
{
|
||
char type;
|
||
char *sp;
|
||
|
||
sp = buffer + 1;
|
||
if (dflag)
|
||
fprintf(stderr, "Processing event '%s'\n", buffer);
|
||
type = *buffer++;
|
||
cfg.push_var_table();
|
||
// No match doesn't have a device, and the format is a little
|
||
// different, so handle it separately.
|
||
if (type != nomatch) {
|
||
sp = strchr(sp, ' ');
|
||
if (sp == NULL)
|
||
return; /* Can't happen? */
|
||
*sp++ = '\0';
|
||
cfg.set_variable("device-name", buffer);
|
||
}
|
||
if (strncmp(sp, "at ", 3) == 0)
|
||
sp += 3;
|
||
sp = cfg.set_vars(sp);
|
||
if (strncmp(sp, "on ", 3) == 0)
|
||
cfg.set_variable("bus", sp + 3);
|
||
cfg.find_and_execute(type);
|
||
cfg.pop_var_table();
|
||
}
|
||
|
||
static void
|
||
event_loop(void)
|
||
{
|
||
int rv;
|
||
int fd;
|
||
char buffer[DEVCTL_MAXBUF];
|
||
|
||
fd = open(PATH_DEVCTL, O_RDONLY);
|
||
if (fd == -1)
|
||
err(1, "Can't open devctl");
|
||
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0)
|
||
err(1, "Can't set close-on-exec flag");
|
||
while (1) {
|
||
if (romeo_must_die)
|
||
break;
|
||
rv = read(fd, buffer, sizeof(buffer) - 1);
|
||
if (rv > 0) {
|
||
buffer[rv] = '\0';
|
||
while (buffer[--rv] == '\n')
|
||
buffer[rv] = '\0';
|
||
process_event(buffer);
|
||
} else if (rv < 0) {
|
||
if (errno != EINTR)
|
||
break;
|
||
} else {
|
||
/* EOF */
|
||
break;
|
||
}
|
||
}
|
||
close(fd);
|
||
}
|
||
|
||
/*
|
||
* functions that the parser uses.
|
||
*/
|
||
void
|
||
add_attach(int prio, event_proc *p)
|
||
{
|
||
cfg.add_attach(prio, p);
|
||
}
|
||
|
||
void
|
||
add_detach(int prio, event_proc *p)
|
||
{
|
||
cfg.add_detach(prio, p);
|
||
}
|
||
|
||
void
|
||
add_directory(const char *dir)
|
||
{
|
||
cfg.add_directory(dir);
|
||
free(const_cast<char *>(dir));
|
||
}
|
||
|
||
void
|
||
add_nomatch(int prio, event_proc *p)
|
||
{
|
||
cfg.add_nomatch(prio, p);
|
||
}
|
||
|
||
event_proc *
|
||
add_to_event_proc(event_proc *ep, eps *eps)
|
||
{
|
||
if (ep == NULL)
|
||
ep = new event_proc();
|
||
ep->add(eps);
|
||
return (ep);
|
||
}
|
||
|
||
eps *
|
||
new_action(const char *cmd)
|
||
{
|
||
eps *e = new action(cmd);
|
||
free(const_cast<char *>(cmd));
|
||
return (e);
|
||
}
|
||
|
||
eps *
|
||
new_match(const char *var, const char *re)
|
||
{
|
||
eps *e = new match(cfg, var, re);
|
||
free(const_cast<char *>(var));
|
||
free(const_cast<char *>(re));
|
||
return (e);
|
||
}
|
||
|
||
void
|
||
set_pidfile(const char *name)
|
||
{
|
||
cfg.set_pidfile(name);
|
||
free(const_cast<char *>(name));
|
||
}
|
||
|
||
void
|
||
set_variable(const char *var, const char *val)
|
||
{
|
||
cfg.set_variable(var, val);
|
||
free(const_cast<char *>(var));
|
||
free(const_cast<char *>(val));
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
gensighand(int)
|
||
{
|
||
romeo_must_die++;
|
||
_exit(0);
|
||
}
|
||
|
||
static void
|
||
usage()
|
||
{
|
||
fprintf(stderr, "usage: %s [-d]\n", getprogname());
|
||
exit(1);
|
||
}
|
||
|
||
/*
|
||
* main
|
||
*/
|
||
int
|
||
main(int argc, char **argv)
|
||
{
|
||
int ch;
|
||
|
||
while ((ch = getopt(argc, argv, "d")) != -1) {
|
||
switch (ch) {
|
||
case 'd':
|
||
dflag++;
|
||
break;
|
||
default:
|
||
usage();
|
||
}
|
||
}
|
||
|
||
cfg.parse();
|
||
if (!dflag)
|
||
daemon(0, 0);
|
||
cfg.drop_pidfile();
|
||
signal(SIGHUP, gensighand);
|
||
signal(SIGINT, gensighand);
|
||
signal(SIGTERM, gensighand);
|
||
event_loop();
|
||
return (0);
|
||
}
|