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annotate src/syslogconfig.h @ 77:c6ba792f1a9a

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systemd only
author Carl Byington <carl@five-ten-sg.com>
date Wed, 15 Jul 2020 13:58:42 -0700
parents c6c8a2102a3e
children
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1 /*
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2
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3 Copyright (c) 2007 Carl Byington - 510 Software Group, released under
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4 the GPL version 3 or any later version at your choice available at
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5 http://www.gnu.org/licenses/gpl-3.0.txt
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6
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7 */
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8
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10 class SYSLOGCONFIG;
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11 class CONTEXT;
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12 class CONFIG;
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13
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14 struct IPPAIR {
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15 int first;
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16 int last;
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17 int cidr;
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18 };
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19
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20 class PATTERN {
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21 const char * pattern; // owned by the string table
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22 regex_t re;
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23 int index; // zero based substring of the regex match that contains the ip address or hostname
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24 int amount; // if positive, count to add to the ip address leaky bucket;
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25 // if negative count to set into the ip address leaky bucket
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26 const char * message; // for logging, owned by the string table
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27 public:
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28 ~PATTERN();
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29 PATTERN(TOKEN &tok, const char *pattern_, int index_, int amount_, const char *msg_);
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30 bool process(char *buf, CONTEXT &con, const char *file_name, int pattern_index);
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31 void dump(int level);
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32 };
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34 struct ltint
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35 {
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36 bool operator()(const int s1, const int s2) const
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37 {
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38 return (unsigned)s1 < (unsigned)s2;
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39 }
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40 };
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41
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42 struct bucket {
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43 int count;
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44 bool blocked; // true iff ever count>threshold
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45 int max_scale; // maximum effective scale
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46 };
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47
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48 typedef map<int, bucket, ltint> ip_buckets;
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49
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50 class IPR {
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51 int reference_count; // number of contexts using this recorder
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52 int daily_timer; // track daily cycle to reduce repeat offenders penalties
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53 ip_buckets violations;
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54 ip_buckets repeat_offenders;
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55 public:
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56 IPR();
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57 int reference(int delta) {reference_count += delta; return reference_count;};
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58 void add(int ip, int amount, CONTEXT &con, const char *file_name, int pattern_index, const char *message);
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59 void leak(int amount, CONTEXT &con);
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60 void free_all(CONTEXT &con);
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61 void update(int ip, bool added, int scale, const char *file_name, int pattern_index, const char *message);
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62 void changed(CONTEXT &con, int ip, bool added);
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63 static IPR* find(const char* name);
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64 static void release(const char* name);
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65 };
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66
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67
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68 typedef SYSLOGCONFIG * SYSLOGCONFIGP;
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69 typedef PATTERN * PATTERNP;
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70 typedef CONTEXT * CONTEXTP;
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71 typedef map<const char *, IPR*> recorder_map;
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72 typedef list<CONTEXTP> context_list;
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73 typedef list<SYSLOGCONFIGP> syslogconfig_list;
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74 typedef list<IPPAIR> ippair_list;
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75 typedef list<PATTERNP> pattern_list;
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76 const int buflen = 1024;
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78 class SYSLOGCONFIG {
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79 TOKEN * tokp;
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80 const char * file_name; // name of the syslog file
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81 pattern_list patterns; // owns the patterns
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82 int fd;
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83 struct stat openfdstat;
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84 int len; // bytes in the buffer
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85 char buf[buflen];
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86 public:
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87 SYSLOGCONFIG(TOKEN &tok, const char *file_name_);
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88 ~SYSLOGCONFIG();
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89 bool failed() { return (fd == -1); };
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90 void open(bool msg);
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91 bool read(CONTEXT &con);
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92 void close();
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93 void add_pattern(PATTERNP pat);
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94 void process(CONTEXT &con);
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95 void dump(int level);
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96 };
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97
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98
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99 class CONTEXT {
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100 public:
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101 const char * name; // name of this context
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102 int threshold;
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103 ippair_list ignore; // owns all the ippairs
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104 const char * add_command; // owned by the string table
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105 const char * remove_command; // ""
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106 IPR * recorder; // used to record violations
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107 syslogconfig_list syslogconfigs; // owns all the syslogconfigs
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108
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109 CONTEXT(const char *nam);
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110 ~CONTEXT();
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111 void set_add(const char *add) { add_command = add; };
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112 void set_remove(const char *remove) { remove_command = remove; };
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113 void set_threshold(int threshold_) { threshold = threshold_; };
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114 int get_threshold() { return threshold; };
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115 void add_syslogconfig(SYSLOGCONFIGP con);
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116 void add_pair(IPPAIR pair);
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117 void dump();
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118 void read(CONFIG &con);
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119 void free_all();
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120 void leak(int delta);
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121 bool looking(int ip);
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122 };
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123
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124
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125 class CONFIG {
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126 public:
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127 // the only mutable stuff once it has been loaded from the config file
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128 int reference_count; // protected by the global config_mutex
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129 // all the rest is constant after loading from the config file
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130 int generation;
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131 time_t load_time;
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132 string_set config_files;
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133 context_list contexts;
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134
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135 CONFIG();
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136 ~CONFIG();
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137 void add_context(CONTEXTP con) {contexts.push_back(con);} ;
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138 void dump();
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139 void read();
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140 void sleep(int duration, time_t &previous);
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141 void free_all();
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142 };
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143
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144 void discard(string_set &s);
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145 const char* register_string(string_set &s, const char *name);
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146 const char* register_string(const char *name);
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147 void clear_strings();
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148 int ip_address(const char *have);
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149 bool load_conf(CONFIG &dc, const char *fn);
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150 void token_init();
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151
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152 extern const char *token_add;
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153 extern const char *token_bucket;
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154 extern const char *token_context;
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155 extern const char *token_file;
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156 extern const char *token_ignore;
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157 extern const char *token_include;
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158 extern const char *token_index;
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159 extern const char *token_lbrace;
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160 extern const char *token_pattern;
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161 extern const char *token_rbrace;
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162 extern const char *token_remove;
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163 extern const char *token_semi;
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164 extern const char *token_slash;
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165 extern const char *token_threshold;
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166