Mercurial > dnsbl

annotate src/context.h @ 291:9f0d9fcb58dd stable-6-0-42

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Never add auto-whitelist entries for outgoing mail from localhost
author Carl Byington <carl@five-ten-sg.com>
date Sat, 28 Jun 2014 17:01:56 -0700
parents 368572c57013
children 802e2b779ed1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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c7fc218686f5 gpl3, block mail to recipients that cannot reply
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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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9 #ifndef context_include
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10 #define context_include
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11
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12 enum status {oksofar, // not rejected yet
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13 white, // whitelisted
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14 black, // blacklisted
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15 reject}; // rejected by a dns list
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16
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17 class DNSBL;
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18 class DNSWL;
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19 class CONTEXT;
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20 class VERIFY;
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21 class SMTP;
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22 class WHITELISTER;
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23 class DELAYWHITE;
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24 class recorder;
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25
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26 typedef map<const char *, const char *, ltstr> string_map;
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27 typedef set<int> int_set;
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28 typedef set<int32_t> int32_t_set;
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29 typedef int32_t_set * int32_t_set_p;
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30 typedef list<SMTP *> smtp_list;
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31 typedef DNSBL * DNSBLP;
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32 typedef DNSWL * DNSWLP;
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33 typedef VERIFY * VERIFYP;
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34 typedef WHITELISTER * WHITELISTERP;
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35 typedef DELAYWHITE * DELAYWHITEP;
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36 typedef list<DNSBLP> dnsblp_list;
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37 typedef map<const char *, DNSBLP, ltstr> dnsblp_map;
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38 typedef list<DNSWLP> dnswlp_list;
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39 typedef map<const char *, DNSWLP, ltstr> dnswlp_map;
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40 typedef CONTEXT * CONTEXTP;
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41 typedef list<CONTEXTP> context_list;
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42 typedef map<const char *, CONTEXTP, ltstr> context_map;
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43 typedef map<const char *, int32_t, ltstr> ns_mapper; // name to ipv4 address
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44 typedef map<const char *, int, ltstr> rates;
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45 typedef map<const char *, int32_t_set_p, ltstr> auth_addresses;
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46 typedef map<const char *, time_t, ltstr> autowhite_sent;
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47 typedef map<const char *, VERIFYP, ltstr> verify_map;
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48 typedef map<const char *, WHITELISTERP, ltstr> whitelister_map;
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49 typedef list<DELAYWHITEP> delay_whitelist;
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50
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51 class SMTP {
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52 static const int maxlen = 1000;
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53 int fd;
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54 bool error;
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55 time_t stamp;
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56 char efrom[maxlen]; // last envelope from sent on this socket
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57 int pending; // unread bytes in buffer, not including the null terminator
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58 char buffer[maxlen];
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59 public:
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60 SMTP(int f) {fd = f; error = false; now(); efrom[0] = '\0'; init();};
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61 ~SMTP() {if (!error) quit(); closefd();};
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62 void init() {pending = 0; buffer[0] = '\0';};
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63 void append(const char *c) {strncat(buffer, c, max(0, maxlen-1-(int)strlen(c)));};
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64 bool err() {return error;};
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65 void now() {stamp = time(NULL);};
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66 time_t get_stamp() {return stamp;};
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67 int get_fd() {return fd;};
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68 int writer();
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69 int reader();
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70 int read_line();
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71 int read_response();
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72 void flush_line(int r);
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73 int cmd(const char *c);
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74 int helo();
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75 int rset();
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76 int from(const char *f);
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77 int rcpt(const char *t);
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78 int quit();
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79 void closefd();
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80 #ifdef VERIFY_DEBUG
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81 static void log(const char *m, int v);
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82 static void log(const char *m, const char *v);
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83 #endif
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84 };
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85
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86 class VERIFY {
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87 const char *host; // host to be used to verify recipient addresses
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88 time_t last_err; // time of last socket error
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89 pthread_mutex_t mutex; // protect the lists of sockets and timestamps
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90 smtp_list connections;// open sockets, ready to be used
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91 public:
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92 VERIFY(const char *h);
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93 void closer(); // if the oldest socket is ancient, close it
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94 SMTP *get_connection();
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95 void put_connection(SMTP *conn);
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96 bool ok(const char *from, const char *to);
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97 };
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98
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99 class WHITELISTER {
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100 const char *fn; // file to use
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101 int days; // how long do we keep entries
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102 pthread_mutex_t mutex; // protect the flag and map
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103 time_t loaded; // when we loaded this file
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104 bool need; // force writing on new entries
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105 autowhite_sent rcpts; // recipient map to remember when we sent them mail
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106 public:
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107 WHITELISTER(const char *f, int d);
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108 void merge();
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109 void writer(); // dump any changes back to the file
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110 void sent(const char *to);
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111 bool is_white(const char *from); // should we white list this sender (did we send them anything recently)
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112 int get_days() {return days;};
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113 void set_days(int d) {days = d;};
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114 };
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115
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116 class DELAYWHITE {
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117 const char *loto;
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118 WHITELISTERP w;
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119 CONTEXTP con;
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120 public:
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121 DELAYWHITE(const char *loto_, WHITELISTERP w_, CONTEXTP con_);
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122 const char *get_loto() {return loto;};
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123 WHITELISTERP get_w() {return w;};
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124 CONTEXTP get_con() {return con;};
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125 };
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126
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127 struct DNSBL {
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128 const char *name; // nickname for this dns based list
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129 const char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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130 const char *message; // error message with one or two %s operators for the ip address replacement
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131 DNSBL(const char *n, const char *s, const char *m);
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132 bool operator==(const DNSBL &rhs);
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133 };
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134
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135 struct DNSWL {
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136 const char *name; // nickname for this dns based list
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137 const char *suffix; // whitelist suffix like list.dnswl.org
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138 int level; // matches 127.0.x.y where y >= level
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139 DNSWL(const char *n, const char *s, const int l);
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140 bool operator==(const DNSWL &rhs);
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141 };
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142
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143 class CONTEXT {
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144 CONTEXTP parent;
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145 const char * name;
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146 context_map children; // map child context names to their contexts
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147 string_set env_to; // this context applies to these envelope recipients
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148 const char * verify_host; // use this smtp host to verify email addresses
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149 VERIFYP verifier; // pointer to the verifier structure
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150 const char * generic_regx; // pointer to generic regular expression
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151 const char * generic_message; // pointer to generic message with one %s
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152 regex_t generic_pattern; // compiled regex pattern
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153 const char * white_regx; // pointer to whitelist regular expression
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154 regex_t white_pattern; // compiled regex pattern
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155 const char * autowhite_file; // file to use for automatic whitelisting
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156 WHITELISTERP whitelister; // pointer to the auto whitelister structure
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157 string_map env_from; // map senders to white/black/unknown
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158 context_map env_from_context; // map senders to a child context
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159 const char * env_from_default; // default value for senders that are not found in the map white/black/unknown/inherit
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160 bool content_filtering; //
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161 const char * content_suffix; // for url body filtering based on ip addresses of hostnames in the body
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162 const char * content_message; // ""
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163 const char * uribl_suffix; // for uribl body filtering based on hostnames in the body
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164 const char * uribl_message; // ""
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165 string_set content_host_ignore; // hosts to ignore for content sbl checking
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166 string_set content_tlds; // names that are tlds
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167 string_set content_tldwilds; // *.names that are tlds
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168 string_set content_tldnots; // names that are not tlds
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169 string_set html_tags; // set of valid html tags
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170 int host_limit; // limit on host names
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171 const char * host_limit_message; // error message for excessive host names
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172 bool host_random; // pick a random selection of host names rather than error for excessive hosts
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173 int tag_limit; // limit on bad html tags
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174 const char * tag_limit_message; // error message for excessive bad html tags
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175 int spamassassin_limit; // max score from spamassassin
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176 bool require_match; // require matching context filtering context
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177 bool require_rdns; // require proper rdns on client ip
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178 bool dcc_greylist; // should we do dcc greylisting?
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179 int dcc_bulk_threshold; // off = 0, many = 1000
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180 dnsblp_map dnsbl_names; // name to dnsbl mapping for lists that are available in this context and children
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181 dnsblp_list dnsbl_list; // list of dnsbls to be used in this context
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182 bool dnsbl_list_parsed; // true iff we have actually parsed a dnsbl_list
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183 dnswlp_map dnswl_names; // name to dnswl mapping for lists that are available in this context and children
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184 dnswlp_list dnswl_list; // list of dnswls to be used in this context
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185 bool dnswl_list_parsed; // true iff we have actually parsed a dnswl_list
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186 int default_rate_limit; // if not specified per user
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187 int default_address_limit; // if not specified per user
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188 int daily_rate_multiple; // daily multiplier applied to hourly rate
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189 int daily_address_multiple; // daily multiplier applied to hourly rate
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190 rates rcpt_per_hour; // per user limits on number of recipients per hour
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191 rates addresses_per_hour; // per user limits on number of unique ip address connections per hour
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192
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193
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194 public:
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195 CONTEXT(CONTEXTP parent_, const char *name_);
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196 ~CONTEXT();
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197 CONTEXTP get_parent() {return parent;};
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198 bool is_parent(CONTEXTP p); // is p a parent of this?
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199 const char* get_full_name(char *buffer, int size);
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200 void add_context(CONTEXTP child) {children[child->name] = child;};
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201 bool allow_env_to(const char *to) {return (parent) ? parent->cover_env_to(to) : true;};
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202 bool cover_env_to(const char *to);
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203
214
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204 void set_verifier(VERIFYP v) {verifier = v;};
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205 void set_verify(const char *host) {verify_host = host;};
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206 const char* get_verify() {return verify_host;};
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207 VERIFYP find_verify(const char *to);
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208
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209
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210 void set_whitelister(WHITELISTERP v) {whitelister = v;};
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211 void set_autowhite(const char *fn) {autowhite_file = fn;};
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212 const char* get_autowhite() {return autowhite_file;};
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213 WHITELISTERP find_autowhite(const char *from, const char *to);
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214
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215 void set_default_rate_limit(int limit) {default_rate_limit = limit;};
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216 void set_default_address_limit(int limit) {default_address_limit = limit;};
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217 void set_daily_rate_multiple(int multiple) {daily_rate_multiple = multiple;};
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218 void set_daily_address_multiple(int multiple) {daily_address_multiple = multiple;};
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219 void add_rate_limit(const char *user, int limit) {rcpt_per_hour[user] = limit;};
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220 void add_address_limit(const char *user, int limit) {addresses_per_hour[user] = limit;};
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221 int find_rate_limit(const char *user); // recipients per hour/day
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222 int find_address_limit(const char *user); // unique ip address connections per hour/day
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223 bool is_unauthenticated_limited(const char *user);
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224 int get_daily_rate_multiple() {return daily_rate_multiple;};
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225 int get_daily_address_multiple() {return daily_address_multiple;};
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226
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227 void add_to(const char *to) {env_to.insert(to);};
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228 void add_from(const char *from, const char *status) {env_from[from] = status;};
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229 void add_from_context(const char *from, CONTEXTP con) {env_from_context[from] = con;};
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230 void set_from_default(const char *status) {env_from_default = status;};
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231 const char* find_from(const char *from, bool update_white = false, const char *queueid = NULL);
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232 CONTEXTP find_context(const char *from);
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233 CONTEXTP find_from_context_name(const char *name);
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234
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235 void set_content_filtering(bool filter) {content_filtering = filter; };
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236 void set_content_suffix(const char *suffix) {content_suffix = suffix; };
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237 void set_content_message(const char *message) {content_message = message; };
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238 void set_uribl_suffix(const char *suffix) {uribl_suffix = suffix; };
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239 void set_uribl_message(const char *message) {uribl_message = message; };
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240 void add_ignore(const char *host) {content_host_ignore.insert(host);};
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241 void add_tld(const char *tld) {content_tlds.insert(tld); };
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242 void add_tldwild(const char *tld) {content_tldwilds.insert(tld); };
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243 void add_tldnot(const char *tld) {content_tldnots.insert(tld); };
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244
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245 void set_host_limit(int limit) {host_limit = limit; };
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246 void set_host_message(const char *message) {host_limit_message = message;};
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247 void set_host_random(bool random) {host_random = random; };
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248 void set_spamassassin_limit(int limit) {spamassassin_limit = limit; };
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249 void set_tag_limit(int limit) {tag_limit = limit; };
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250 void set_tag_message(const char *message) {tag_limit_message = message;};
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251 void add_tag(const char *tag) {html_tags.insert(tag); };
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252
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253 void add_dnsbl(const char *name, DNSBLP dns) {dnsbl_names[name] = dns; };
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254 void add_dnsbl(DNSBLP dns) {dnsbl_list.push_back(dns);};
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255 DNSBLP find_dnsbl(const char *name);
255
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256 void set_dnsbll_parsed() {dnsbl_list_parsed = true;};
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257
249
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258 void add_dnswl(const char *name, DNSWLP dns) {dnswl_names[name] = dns; };
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259 void add_dnswl(DNSWLP dns) {dnswl_list.push_back(dns);};
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260 DNSWLP find_dnswl(const char *name);
255
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261 void set_dnswll_parsed() {dnswl_list_parsed = true;};
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262
233
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263 bool set_white(const char *regx);
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264 bool white_match(const char *from);
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265
214
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266 bool set_generic(const char *regx, const char *msg);
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267 const char* generic_match(const char *client);
168
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268
214
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269 void set_require(bool r) {require_match = r; };
268
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270 void set_requirerdns(bool r) {require_rdns = r; };
214
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271 void set_grey(bool g) {dcc_greylist = g; };
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272 void set_bulk(int b) {dcc_bulk_threshold = b; };
178
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273
268
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274 bool get_content_filtering() {return content_filtering; };
214
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275 bool get_require() {return content_filtering && require_match; };
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276 bool get_requirerdns() {return require_rdns; };
214
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277 bool get_grey() {return content_filtering && dcc_greylist; };
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278 int get_bulk() {return (content_filtering) ? dcc_bulk_threshold : 0;};
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279 int get_host_limit() {return (content_filtering) ? host_limit : 0;};
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280 bool get_host_random() {return (content_filtering) ? host_random : 0;};
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281 int get_spamassassin_limit() {return (content_filtering) ? spamassassin_limit : 0;};
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282 const char* get_content_suffix();
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283 const char* get_content_message();
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284 const char* get_uribl_suffix();
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285 const char* get_uribl_message();
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286 string_set& get_content_host_ignore();
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287 string_set& get_content_tlds();
270
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288 string_set& get_content_tldwilds();
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289 string_set& get_content_tldnots();
214
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290 string_set& get_html_tags();
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diff changeset
291 dnsblp_list& get_dnsbl_list();
249
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292 dnswlp_list& get_dnswl_list();
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293
214
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294 bool acceptable_content(recorder &memory, int score, int bulk, string& msg);
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295 bool ignore_host(const char *host);
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296
214
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297 void dump(bool isdefault, bool &spamass, int level = 0);
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298 };
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299
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300
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301 struct CONFIG {
214
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302 // the only mutable stuff once it has been loaded from the config file
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303 int reference_count; // protected by the global config_mutex
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304 // all the rest is constant after loading from the config file
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305 int generation;
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306 time_t load_time;
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307 string_set config_files;
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308 context_list contexts; // owns all the contexts, not just top level contexts
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309 context_map env_to; // map recipient to a filtering context
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310 CONTEXTP default_context;// for env_to values that don't have their own specific filtering context
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311 // the default context is also used for some of the content filtering values
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312
214
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313 CONFIG();
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314 ~CONFIG();
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315 void add_context(CONTEXTP con);
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316 void add_to(const char *to, CONTEXTP con);
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317 CONTEXTP find_context(const char *to);
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318 void dump();
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319 };
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320
136
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diff changeset
321
270
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322 extern const char *token_asterisk;
214
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323 extern const char *token_autowhite;
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324 extern const char *token_bang;
214
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325 extern const char *token_black;
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326 extern const char *token_content;
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327 extern const char *token_context;
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328 extern const char *token_dccbulk;
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329 extern const char *token_dccfrom;
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330 extern const char *token_dccgrey;
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331 extern const char *token_dccto;
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332 extern const char *token_default;
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333 extern const char *token_dnsbl;
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334 extern const char *token_dnsbll;
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335 extern const char *token_dnswl;
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336 extern const char *token_dnswll;
214
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337 extern const char *token_envfrom;
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338 extern const char *token_envto;
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339 extern const char *token_filter;
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340 extern const char *token_generic;
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341 extern const char *token_host_limit;
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342 extern const char *token_html_limit;
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343 extern const char *token_html_tags;
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344 extern const char *token_ignore;
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345 extern const char *token_include;
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346 extern const char *token_inherit;
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347 extern const char *token_lbrace;
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348 extern const char *token_mailhost;
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349 extern const char *token_many;
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350 extern const char *token_no;
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351 extern const char *token_off;
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352 extern const char *token_ok;
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diff changeset
353 extern const char *token_ok2;
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diff changeset
354 extern const char *token_on;
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355 extern const char *token_period;
214
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diff changeset
356 extern const char *token_rate;
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357 extern const char *token_rbrace;
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diff changeset
358 extern const char *token_require;
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diff changeset
359 extern const char *token_requirerdns;
214
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diff changeset
360 extern const char *token_semi;
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361 extern const char *token_soft;
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diff changeset
362 extern const char *token_spamassassin;
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363 extern const char *token_substitute;
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diff changeset
364 extern const char *token_tld;
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diff changeset
365 extern const char *token_unknown;
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diff changeset
366 extern const char *token_uribl;
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diff changeset
367 extern const char *token_verify;
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diff changeset
368 extern const char *token_white;
233
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diff changeset
369 extern const char *token_white_regex;
214
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diff changeset
370 extern const char *token_yes;
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diff changeset
371
214
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diff changeset
372 extern pthread_mutex_t verifier_mutex; // protect the verifier map
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diff changeset
373 extern pthread_mutex_t whitelister_mutex; // protect the
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diff changeset
374
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diff changeset
375 void discard(string_set &s);
214
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diff changeset
376 const char* register_string(string_set &s, const char *name);
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diff changeset
377 const char* register_string(const char *name);
164
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diff changeset
378 void clear_strings();
214
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diff changeset
379 bool load_conf(CONFIG &dc, const char *fn);
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diff changeset
380 void* verify_closer(void *arg);
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diff changeset
381 void* whitelister_writer(void *arg);
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diff changeset
382 void token_init();
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383
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diff changeset
384 #endif