sbin/devd/devd.hh

   1 /*-
   2  * Copyright (c) 2002-2003 M. Warner Losh.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sbin/devd/devd.hh,v 1.5 2007/12/21 01:00:04 imp Exp $
  27  * $DragonFly: src/sbin/devd/devd.hh,v 1.1 2008/10/03 00:26:21 hasso Exp $
  28  */
  29
  30 #ifndef DEVD_HH
  31 #define DEVD_HH
  32
  33 class config;
  34
  35 /**
  36  * var_list is a collection of variables.  These collections of variables
  37  * are stacked up and popped down for each event that we have to process.
  38  * We have multiple levels so that we can push variables that are unique
  39  * to the event in question, in addition to having global variables.  This
  40  * allows for future flexibility.
  41  */
  42 class var_list
  43 {
  44 public:
  45         var_list() {}
  46         virtual ~var_list() {}
  47         /** Set a variable in this var list.
  48          */
  49         void set_variable(const std::string &var, const std::string &val);
  50         /** Get the variable out of this, and no other, var_list.  If
  51          * no variable of %var is set, then %bogus will be returned.
  52          */
  53         const std::string &get_variable(const std::string &var) const;
  54         /** Is there a variable of %var set in thi stable?
  55          */
  56         bool is_set(const std::string &var) const;
  57         /** A completely bogus string.
  58          */
  59         static const std::string bogus;
  60         static const std::string nothing;
  61 private:
  62         std::map<std::string, std::string> _vars;
  63 };
  64
  65 /**
  66  * eps is short for event_proc_single.  It is a single entry in an
  67  * event_proc.  Each keyword needs its own subclass from eps.
  68  */
  69 class eps
  70 {
  71 public:
  72         eps() {}
  73         virtual ~eps() {}
  74         /** Does this eps match the current config?
  75          */
  76         virtual bool do_match(config &) = 0;
  77         /** Perform some action for this eps.
  78          */
  79         virtual bool do_action(config &) = 0;
  80 };
  81
  82 /**
  83  * match is the subclass used to match an individual variable.  Its
  84  * actions are nops.
  85  */
  86 class match : public eps
  87 {
  88 public:
  89         match(config &, const char *var, const char *re);
  90         virtual ~match();
  91         virtual bool do_match(config &);
  92         virtual bool do_action(config &) { return true; }
  93 private:
  94         std::string _var;
  95         std::string _re;
  96         regex_t _regex;
  97 };
  98
  99 /**
 100  * media is the subclass used to match an individual variable.  Its
 101  * actions are nops.
 102  */
 103 class media : public eps
 104 {
 105 public:
 106         media(config &, const char *var, const char *type);
 107         virtual ~media();
 108         virtual bool do_match(config &);
 109         virtual bool do_action(config &) { return true; }
 110 private:
 111         std::string _var;
 112         int _type;
 113 };
 114
 115 /**
 116  * action is used to fork a process.  It matches everything.
 117  */
 118 class action : public eps
 119 {
 120 public:
 121         action(const char *cmd);
 122         virtual ~action();
 123         virtual bool do_match(config &) { return true; }
 124         virtual bool do_action(config &);
 125 private:
 126         std::string _cmd;
 127 };
 128
 129 class event_proc
 130 {
 131 public:
 132         event_proc();
 133         virtual ~event_proc();
 134         int get_priority() const { return (_prio); }
 135         void set_priority(int prio) { _prio = prio; }
 136         void add(eps *);
 137         bool matches(config &);
 138         bool run(config &);
 139 private:
 140         int _prio;
 141         std::vector<eps *> _epsvec;
 142 };
 143
 144 class config
 145 {
 146 public:
 147         config() { _pidfile = ""; push_var_table(); }
 148         virtual ~config() { reset(); }
 149         void add_attach(int, event_proc *);
 150         void add_detach(int, event_proc *);
 151         void add_directory(const char *);
 152         void add_nomatch(int, event_proc *);
 153         void add_notify(int, event_proc *);
 154         void set_pidfile(const char *);
 155         void reset();
 156         void parse();
 157         void open_pidfile();
 158         void write_pidfile();
 159         void remove_pidfile();
 160         void push_var_table();
 161         void pop_var_table();
 162         void set_variable(const char *var, const char *val);
 163         const std::string &get_variable(const std::string &var);
 164         const std::string expand_string(const std::string &var);
 165         char *set_vars(char *);
 166         void find_and_execute(char);
 167 protected:
 168         void sort_vector(std::vector<event_proc *> &);
 169         void parse_one_file(const char *fn);
 170         void parse_files_in_dir(const char *dirname);
 171         void expand_one(const char *&src, std::string &dst);
 172         bool is_id_char(char);
 173         bool chop_var(char *&buffer, char *&lhs, char *&rhs);
 174 private:
 175         std::vector<std::string> _dir_list;
 176         std::string _pidfile;
 177         std::vector<var_list *> _var_list_table;
 178         std::vector<event_proc *> _attach_list;
 179         std::vector<event_proc *> _detach_list;
 180         std::vector<event_proc *> _nomatch_list;
 181         std::vector<event_proc *> _notify_list;
 182 };
 183
 184 #endif /* DEVD_HH */