annotate src/context.h @ 133:b8ce1b31237d stable-5-19

uribl lookups fully qualified; allow two component host names
author carl
date Tue, 01 Aug 2006 15:28:13 -0700
parents d9d2f8699621
children f4746d8a12a3
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1 #ifndef context_include
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2 #define context_include
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3
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4 #include "tokenizer.h"
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5 #include <map>
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6
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7
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8 enum status {oksofar, // not rejected yet
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9 white, // whitelisted
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10 black, // blacklisted
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11 reject}; // rejected by a dns list
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12
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13 class DNSBL;
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14 class CONTEXT;
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15 class VERIFY;
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16 class SMTP;
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17 class recorder;
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18
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19 typedef map<char *, char *, ltstr> string_map;
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20 typedef set<int> int_set;
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21 typedef list<SMTP *> smtp_list;
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22 typedef list<char *> string_list;
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23 typedef DNSBL * DNSBLP;
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24 typedef VERIFY * VERIFYP;
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25 typedef list<DNSBLP> dnsblp_list;
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26 typedef map<char *, DNSBLP, ltstr> dnsblp_map;
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27 typedef CONTEXT * CONTEXTP;
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28 typedef list<CONTEXTP> context_list;
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29 typedef map<char *, CONTEXTP, ltstr> context_map;
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30 typedef map<char *, int, ltstr> ns_mapper;
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31 typedef map<char *, VERIFYP, ltstr> verify_map;
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32
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33 class SMTP {
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34 static const int maxlen = 1000;
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35 int fd;
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36 bool error;
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37 time_t stamp;
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38 char efrom[maxlen]; // last envelope from sent on this socket
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39 int pending; // unread bytes in buffer, not including the null terminator
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40 char buffer[maxlen];
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41 public:
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42 SMTP(int f) {fd = f; error = false; now(); efrom[0] = '\0'; init();};
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43 ~SMTP() {if (!error) quit(); closefd();};
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44 void init() {pending = 0; buffer[0] = '\0';};
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45 void append(char *c) {strncat(buffer, c, max(0, maxlen-1-(int)strlen(c)));};
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46 bool err() {return error;};
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47 void now() {stamp = time(NULL);};
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48 time_t get_stamp() {return stamp;};
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49 int get_fd() {return fd;};
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50 int writer();
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51 int reader();
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52 int read_line();
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53 int read_response();
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54 void flush_line(int r);
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55 int cmd(char *c);
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56 int helo();
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57 int rset();
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58 int from(char *f);
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59 int rcpt(char *t);
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60 int quit();
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61 void closefd();
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62 #ifdef VERIFY_DEBUG
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63 static void log(char *m, int v);
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64 static void log(char *m, char *v);
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65 #endif
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66 };
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67
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68 class VERIFY {
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69 char *host; // host to be used to verify recipient addresses
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70 time_t last_err; // time of last socket error
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71 pthread_mutex_t mutex; // protect the lists of sockets and timestamps
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72 smtp_list connections;// open sockets, ready to be used
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73 public:
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74 VERIFY(char *h);
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75 void closer(); // if the oldest socket is ancient, close it
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76 SMTP *get_connection();
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77 void put_connection(SMTP *conn);
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78 bool ok(char *from, char *to);
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79 };
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80
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81 struct DNSBL {
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82 char *name; // nickname for this dns based list
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83 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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84 char *message; // error message with one or two %s operators for the ip address replacement
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85 DNSBL(char *n, char *s, char *m);
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86 bool operator==(const DNSBL &rhs);
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87 };
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88
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89 class CONTEXT {
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90 CONTEXTP parent;
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91 char * name;
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92 context_map children; // map child context names to their contexts
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93 string_set env_to; // this context applies to these envelope recipients
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94 char * verify_host; // use this smtp host to verify email addresses
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95 string_map env_from; // map senders to white/black/unknown
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96 context_map env_from_context; // map senders to a child context
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97 char * env_from_default; // default value for senders that are not found in the map white/black/unknown/inherit
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98 bool content_filtering; //
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99 char * content_suffix; // for url body filtering based on ip addresses of hostnames in the body
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100 char * content_message; // ""
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101 char * uribl_suffix; // for uribl body filtering based on hostnames in the body
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102 char * uribl_message; // ""
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103 string_set content_host_ignore;// hosts to ignore for content sbl checking
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104 string_set content_tlds; //
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105 string_set content_cctlds; //
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106 string_set html_tags; // set of valid html tags
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107 int host_limit; // limit on host names
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108 char * host_limit_message; // error message for excessive host names
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109 bool host_random; // pick a random selection of host names rather than error for excessive hosts
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110 int tag_limit; // limit on bad html tags
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111 char * tag_limit_message; // error message for excessive bad html tags
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112 dnsblp_map dnsbl_names; // name to dnsbl mapping for lists that are available in this context and children
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113 dnsblp_list dnsbl_list; // list of dnsbls to be used in this context
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114
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115 public:
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116 CONTEXT(CONTEXTP parent_, char *name_);
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117 ~CONTEXT();
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118 CONTEXTP get_parent() {return parent;};
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119 bool is_parent(CONTEXTP p); // is p a parent of this?
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120 char* get_full_name(char *buf, int size);
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121 void add_context(CONTEXTP child) {children[child->name] = child;};
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122 bool allow_env_to(char *to) {return (parent) ? parent->cover_env_to(to) : true;};
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123 bool cover_env_to(char *to);
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124
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125 void set_verify(char *host) {verify_host = host;};
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126 char* get_verify() {return verify_host;};
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127 VERIFYP find_verify(char *to);
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128
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129 void add_to(char *to) {env_to.insert(to);};
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130 void add_from(char *from, char *status) {env_from[from] = status;};
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131 void add_from_context(char *from, CONTEXTP con) {env_from_context[from] = con;};
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132 void set_from_default(char *status) {env_from_default = status;};
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133 char* find_from(char *from);
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134 CONTEXTP find_context(char *from);
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135 CONTEXTP find_from_context_name(char *name);
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136
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137 void set_content_filtering(bool filter) {content_filtering = filter;};
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138 void set_content_suffix(char *suffix) {content_suffix = suffix;};
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139 void set_content_message(char *message) {content_message = message;};
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140 void set_uribl_suffix(char *suffix) {uribl_suffix = suffix;};
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141 void set_uribl_message(char *message) {uribl_message = message;};
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142 void add_ignore(char *host) {content_host_ignore.insert(host);};
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143 void add_tld(char *tld) {content_tlds.insert(tld);};
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144 void add_cctld(char *cctld) {content_cctlds.insert(cctld);};
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145
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146 void set_host_limit(int limit) {host_limit = limit;};
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147 void set_host_message(char *message) {host_limit_message = message;};
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148 void set_host_random(bool random) {host_random = random;};
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149 void set_tag_limit(int limit) {tag_limit = limit;};
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150 void set_tag_message(char *message) {tag_limit_message = message;};
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151 void add_tag(char *tag) {html_tags.insert(tag);};
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152
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153 void add_dnsbl(char *name, DNSBLP dns) {dnsbl_names[name] = dns;};
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154 void add_dnsbl(DNSBLP dns) {dnsbl_list.push_back(dns);};
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155 DNSBLP find_dnsbl(char *name);
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156
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157 bool get_content_filtering() {return content_filtering;};
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158 int get_host_limit() {return host_limit;};
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159 bool get_host_random() {return host_random;};
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160 char* get_content_suffix();
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161 char* get_content_message();
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162 char* get_uribl_suffix();
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163 char* get_uribl_message();
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164 string_set& get_content_host_ignore();
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165 string_set& get_content_tlds();
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166 string_set& get_content_cctlds();
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167 string_set& get_html_tags();
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168 dnsblp_list& get_dnsbl_list();
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169
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170 bool acceptable_content(recorder &memory, char *&msg);
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171 bool ignore_host(char *host);
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172
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173 void dump(int level = 0);
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174 };
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175
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176
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177 struct CONFIG {
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178 // the only mutable stuff once it has been loaded from the config file
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179 int reference_count; // protected by the global config_mutex
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180 // all the rest is constant after loading from the config file
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181 int generation;
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182 time_t load_time;
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183 string_set config_files;
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184 context_list contexts; // owns all the contexts, not just top level contexts
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185 context_map env_to; // map recipient to a filtering context
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186 CONTEXTP default_context;// for env_to values that don't have their own specific filtering context
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187 // the default context is also used for some of the content filtering values
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188
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189 CONFIG();
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190 ~CONFIG();
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191 void add_context(CONTEXTP con);
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192 void add_to(char *to, CONTEXTP con);
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193 CONTEXTP find_context(char *to);
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194 void dump();
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195 };
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196
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197 extern char *token_black;
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198 extern char *token_cctld;
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199 extern char *token_content;
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200 extern char *token_context;
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201 extern char *token_dccfrom;
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202 extern char *token_dccto;
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203 extern char *token_default;
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204 extern char *token_dnsbl;
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205 extern char *token_dnsbll;
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206 extern char *token_envfrom;
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207 extern char *token_envto;
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208 extern char *token_filter;
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209 extern char *token_host_limit;
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210 extern char *token_html_limit;
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211 extern char *token_html_tags;
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212 extern char *token_ignore;
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213 extern char *token_include;
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214 extern char *token_inherit;
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215 extern char *token_lbrace;
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216 extern char *token_mailhost;
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217 extern char *token_many;
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218 extern char *token_off;
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219 extern char *token_ok2;
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220 extern char *token_ok;
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221 extern char *token_on;
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222 extern char *token_rbrace;
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223 extern char *token_semi;
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224 extern char *token_soft;
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225 extern char *token_substitute;
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226 extern char *token_tld;
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227 extern char *token_unknown;
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228 extern char *token_uribl;
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229 extern char *token_white;
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230
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231 extern char *token_myhostname;
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232
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233 extern verify_map verifiers; // map of smtp hosts to verify structures, owns all the verify structures
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234 extern string_set all_strings; // owns all the strings, only modified by the config loader thread
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235
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236 void discard(string_set &s);
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237 char* register_string(string_set &s, char *name);
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238 char* register_string(char *name);
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239 CONFIG *parse_config(char *fn);
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240 bool load_conf(CONFIG &dc, char *fn);
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241 void add_verify_host(char *host);
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242 void* verify_closer(void *arg);
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243 void token_init();
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244
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245 #endif