1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002-2003 M. Warner Losh. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef DEVD_HH 32 #define DEVD_HH 33 34 class config; 35 36 /** 37 * var_list is a collection of variables. These collections of variables 38 * are stacked up and popped down for each event that we have to process. 39 * We have multiple levels so that we can push variables that are unique 40 * to the event in question, in addition to having global variables. This 41 * allows for future flexibility. 42 */ 43 class var_list 44 { 45 public: 46 /** Set a variable in this var list. 47 */ 48 void set_variable(const std::string &var, const std::string &val); 49 /** Get the variable out of this, and no other, var_list. If 50 * no variable of %var is set, then %bogus will be returned. 51 */ 52 const std::string &get_variable(const std::string &var) const; 53 /** Is there a variable of %var set in this table? 54 */ 55 bool is_set(const std::string &var) const; 56 /** A completely bogus string. 57 */ 58 static const std::string bogus; 59 static const std::string nothing; 60 61 private: 62 std::string fix_value(const std::string &val) const; 63 64 std::map<std::string, std::string> _vars; 65 }; 66 67 /** 68 * eps is short for event_proc_single. It is a single entry in an 69 * event_proc. Each keyword needs its own subclass from eps. 70 */ 71 struct eps 72 { 73 public: 74 virtual ~eps() {} 75 /** Does this eps match the current config? 76 */ 77 virtual bool do_match(config &) = 0; 78 /** Perform some action for this eps. 79 */ 80 virtual bool do_action(config &) = 0; 81 }; 82 83 /** 84 * match is the subclass used to match an individual variable. Its 85 * actions are nops. 86 */ 87 class match : public eps 88 { 89 public: 90 match(config &, const char *var, const char *re); 91 virtual ~match(); 92 virtual bool do_match(config &); 93 virtual bool do_action(config &) { return true; } 94 private: 95 bool _inv; 96 std::string _var; 97 std::string _re; 98 regex_t _regex; 99 }; 100 101 /** 102 * media is the subclass used to match an individual variable. Its 103 * actions are nops. 104 */ 105 class media : public eps 106 { 107 public: 108 media(config &, const char *var, const char *type); 109 virtual ~media(); 110 virtual bool do_match(config &); 111 virtual bool do_action(config &) { return true; } 112 private: 113 std::string _var; 114 int _type; 115 }; 116 117 /** 118 * action is used to fork a process. It matches everything. 119 */ 120 class action : public eps 121 { 122 public: 123 action(const char *cmd); 124 virtual ~action(); 125 virtual bool do_match(config &) { return true; } 126 virtual bool do_action(config &); 127 private: 128 std::string _cmd; 129 }; 130 131 struct event_proc 132 { 133 public: 134 event_proc(); 135 virtual ~event_proc(); 136 int get_priority() const { return (_prio); } 137 void set_priority(int prio) { _prio = prio; } 138 void add(eps *); 139 bool matches(config &) const; 140 bool run(config &) const; 141 private: 142 int _prio; 143 std::vector<eps *> _epsvec; 144 }; 145 146 class config 147 { 148 public: 149 config() { push_var_table(); } 150 virtual ~config() { reset(); } 151 void add_attach(int, event_proc *); 152 void add_detach(int, event_proc *); 153 void add_directory(const char *); 154 void add_nomatch(int, event_proc *); 155 void add_notify(int, event_proc *); 156 void set_pidfile(const char *); 157 void reset(); 158 void parse(); 159 void close_pidfile(); 160 void open_pidfile(); 161 void write_pidfile(); 162 void remove_pidfile(); 163 void push_var_table(); 164 void pop_var_table(); 165 void set_variable(const char *var, const char *val); 166 const std::string &get_variable(const std::string &var); 167 const std::string expand_string(const char * var, 168 const char * prepend = NULL, const char * append = NULL); 169 char *set_vars(char *); 170 void find_and_execute(char); 171 protected: 172 void sort_vector(std::vector<event_proc *> &); 173 void parse_one_file(const char *fn); 174 void parse_files_in_dir(const char *dirname); 175 void expand_one(const char *&src, std::string &dst); 176 bool is_id_char(char) const; 177 bool chop_var(char *&buffer, char *&lhs, char *&rhs) const; 178 private: 179 std::vector<std::string> _dir_list; 180 std::string _pidfile; 181 std::vector<var_list *> _var_list_table; 182 std::vector<event_proc *> _attach_list; 183 std::vector<event_proc *> _detach_list; 184 std::vector<event_proc *> _nomatch_list; 185 std::vector<event_proc *> _notify_list; 186 }; 187 188 #endif /* DEVD_HH */ 189