Mercurial > dnsbl

annotate src/context.h @ 322:9f8411f3919c

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add dkim white/black listing
author Carl Byington <carl@five-ten-sg.com>
date Sat, 17 Dec 2016 17:04:52 -0800
parents e172dc10fe24
children 5e4b5540c8cc
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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 DKIM;
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18 class DNSBL;
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19 class DNSWL;
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20 class CONTEXT;
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21 class VERIFY;
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22 class SMTP;
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23 class WHITELISTER;
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24 class DELAYWHITE;
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25 class recorder;
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26
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27 typedef map<const char *, const char *, ltstr> string_map;
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28 typedef set<int> int_set;
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29 typedef set<int32_t> int32_t_set;
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30 typedef int32_t_set * int32_t_set_p;
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31 typedef list<SMTP *> smtp_list;
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32 typedef DKIM * DKIMP;
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33 typedef DNSBL * DNSBLP;
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34 typedef DNSWL * DNSWLP;
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35 typedef VERIFY * VERIFYP;
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36 typedef WHITELISTER * WHITELISTERP;
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37 typedef DELAYWHITE * DELAYWHITEP;
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38 typedef map<const char *, DKIMP, ltstr> dkimp_map;
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39 typedef list<DNSBLP> dnsblp_list;
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40 typedef map<const char *, DNSBLP, ltstr> dnsblp_map;
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41 typedef list<DNSWLP> dnswlp_list;
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42 typedef map<const char *, DNSWLP, ltstr> dnswlp_map;
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43 typedef CONTEXT * CONTEXTP;
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44 typedef list<CONTEXTP> context_list;
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45 typedef map<const char *, CONTEXTP, ltstr> context_map;
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46 typedef map<const char *, int32_t, ltstr> ns_mapper; // name to ipv4 address
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47 typedef map<const char *, int, ltstr> rates;
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48 typedef map<const char *, int32_t_set_p, ltstr> auth_addresses;
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49 typedef map<const char *, time_t, ltstr> autowhite_sent;
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50 typedef map<const char *, VERIFYP, ltstr> verify_map;
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51 typedef map<const char *, WHITELISTERP, ltstr> whitelister_map;
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52 typedef list<DELAYWHITEP> delay_whitelist;
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53
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54 class SMTP {
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55 static const int maxlen = 1000;
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56 static const int qlen = 20;
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57 int fd;
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58 bool error;
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59 time_t stamp;
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60 char efrom[maxlen]; // last envelope from sent on this socket
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61 int pending; // unread bytes in buffer, not including the null terminator
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62 char buffer[maxlen];
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63 char queueid[qlen]; // last queueid for logging
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64 public:
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65 SMTP(int f) {fd = f; error = false; now(); efrom[0] = '\0'; queueid[0] = '\0'; init();};
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66 ~SMTP() {if (!error) quit(); closefd();};
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67 void init() {pending = 0; buffer[0] = '\0';};
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68 void append(const char *c) {strncat(buffer, c, max(0, maxlen-1-(int)strlen(c)));};
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69 bool err() {return error;};
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70 void now() {stamp = time(NULL);};
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71 time_t get_stamp() {return stamp;};
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72 int get_fd() {return fd;};
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73 void set_id(const char *id) {strncpy(queueid, id, qlen); queueid[qlen-1] = '\0';};
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74 int writer();
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75 int reader();
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76 int read_line();
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77 int read_response();
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78 void flush_line(int r);
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79 int cmd(const char *c);
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80 int helo();
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81 int rset();
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82 int from(const char *f);
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83 int rcpt(const char *t);
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84 int quit();
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85 void closefd();
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86 void log(const char *m, int v);
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87 void log(const char *m, const char *v);
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88 };
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89
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90 class VERIFY {
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91 const char *host; // host to be used to verify recipient addresses
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92 time_t last_err; // time of last socket error
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93 pthread_mutex_t mutex; // protect the lists of sockets and timestamps
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94 smtp_list connections;// open sockets, ready to be used
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95 public:
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96 VERIFY(const char *h);
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97 void log(const char *m, const char *q, const char *v);
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98 void closer(); // if the oldest socket is ancient, close it
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99 SMTP *get_connection(const char *queueid);
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100 void put_connection(SMTP *conn);
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101 bool ok(const char *queueid, const char *from, const char *to);
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102 };
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103
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104 class WHITELISTER {
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105 const char *fn; // file to use
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106 int days; // how long do we keep entries
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107 pthread_mutex_t mutex; // protect the flag and map
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108 time_t loaded; // when we loaded this file
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109 bool need; // force writing on new entries
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110 autowhite_sent rcpts; // recipient map to remember when we sent them mail
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111 public:
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112 WHITELISTER(const char *f, int d);
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113 void merge();
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114 void writer(); // dump any changes back to the file
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115 void sent(const char *to);
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116 bool is_white(const char *from); // should we white list this sender (did we send them anything recently)
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117 int get_days() {return days;};
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118 void set_days(int d) {days = d;};
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119 };
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120
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121 class DELAYWHITE {
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122 const char *loto;
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123 WHITELISTERP w;
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124 CONTEXTP con;
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125 public:
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126 DELAYWHITE(const char *loto_, WHITELISTERP w_, CONTEXTP con_);
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127 const char *get_loto() {return loto;};
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128 WHITELISTERP get_w() {return w;};
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129 CONTEXTP get_con() {return con;};
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130 };
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131
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132 struct DKIM {
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133 const char *action;
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134 const char *signer;
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135 public:
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136 DKIM(const char *action_, const char *signer_);
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137 };
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138
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139 struct DNSBL {
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140 const char *name; // nickname for this dns based list
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141 const char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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142 const char *message; // error message with one or two %s operators for the ip address replacement
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143 DNSBL(const char *n, const char *s, const char *m);
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144 bool operator==(const DNSBL &rhs);
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145 };
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146
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147 struct DNSWL {
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148 const char *name; // nickname for this dns based list
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149 const char *suffix; // whitelist suffix like list.dnswl.org
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150 int level; // matches 127.0.x.y where y >= level
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151 DNSWL(const char *n, const char *s, const int l);
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152 bool operator==(const DNSWL &rhs);
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153 };
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154
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155 class CONTEXT {
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156 CONTEXTP parent;
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157 const char * name;
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158 context_map children; // map child context names to their contexts
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159 string_set env_to; // this context applies to these envelope recipients
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160 const char * verify_host; // use this smtp host to verify email addresses
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161 VERIFYP verifier; // pointer to the verifier structure
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162 const char * generic_regx; // pointer to generic regular expression
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163 const char * generic_message; // pointer to generic message with one %s
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164 regex_t generic_pattern; // compiled regex pattern
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165 const char * white_regx; // pointer to whitelist regular expression
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166 regex_t white_pattern; // compiled regex pattern
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167 const char * autowhite_file; // file to use for automatic whitelisting
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168 WHITELISTERP whitelister; // pointer to the auto whitelister structure
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169 string_map env_from; // map senders to white/black/unknown
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170 context_map env_from_context; // map senders to a child context
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171 const char * env_from_default; // default value for senders that are not found in the map white/black/unknown/inherit
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172 bool content_filtering; //
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173 const char * content_suffix; // for url body filtering based on ip addresses of hostnames in the body
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174 const char * content_message; // ""
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175 const char * uribl_suffix; // for uribl body filtering based on hostnames in the body
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176 const char * uribl_message; // ""
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177 string_set content_host_ignore; // hosts to ignore for content sbl checking
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178 string_set content_tlds; // names that are tlds
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179 string_set content_tldwilds; // *.names that are tlds
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180 string_set content_tldnots; // names that are not tlds
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181 string_set html_tags; // set of valid html tags
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182 int host_limit; // limit on host names
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183 const char * host_limit_message; // error message for excessive host names
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184 bool host_random; // pick a random selection of host names rather than error for excessive hosts
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185 int tag_limit; // limit on bad html tags
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186 const char * tag_limit_message; // error message for excessive bad html tags
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187 int spamassassin_limit; // max score from spamassassin
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188 bool require_match; // require matching context filtering context
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189 bool require_rdns; // require proper rdns on client ip
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190 bool dcc_greylist; // should we do dcc greylisting?
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191 int dcc_bulk_threshold; // off = 0, many = 1000
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192 dkimp_map dkim_from_names; // map header from domains to dkim constraints
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193 string_map dkim_signer_names; // map dkim signers to actions
278
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194 dnsblp_map dnsbl_names; // name to dnsbl mapping for lists that are available in this context and children
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195 dnsblp_list dnsbl_list; // list of dnsbls to be used in this context
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196 bool dnsbl_list_parsed; // true iff we have actually parsed a dnsbl_list
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197 dnswlp_map dnswl_names; // name to dnswl mapping for lists that are available in this context and children
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198 dnswlp_list dnswl_list; // list of dnswls to be used in this context
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199 bool dnswl_list_parsed; // true iff we have actually parsed a dnswl_list
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200 int default_rate_limit; // if not specified per user
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201 int default_address_limit; // if not specified per user
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202 int daily_rate_multiple; // daily multiplier applied to hourly rate
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203 int daily_address_multiple; // daily multiplier applied to hourly rate
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204 rates rcpt_per_hour; // per user limits on number of recipients per hour
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205 rates addresses_per_hour; // per user limits on number of unique ip address connections per hour
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206
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207
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208 public:
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209 CONTEXT(CONTEXTP parent_, const char *name_);
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210 ~CONTEXT();
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211 CONTEXTP get_parent() {return parent;};
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212 bool is_parent(CONTEXTP p); // is p a parent of this?
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213 const char* get_full_name(char *buffer, int size);
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214 void add_context(CONTEXTP child) {children[child->name] = child;};
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215 bool allow_env_to(const char *to) {return (parent) ? parent->cover_env_to(to) : true;};
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216 bool cover_env_to(const char *to);
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217
214
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218 void set_verifier(VERIFYP v) {verifier = v;};
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219 void set_verify(const char *host) {verify_host = host;};
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220 const char* get_verify() {return verify_host;};
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221 VERIFYP find_verify(const char *to);
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222
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223
214
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224 void set_whitelister(WHITELISTERP v) {whitelister = v;};
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225 void set_autowhite(const char *fn) {autowhite_file = fn;};
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226 const char* get_autowhite() {return autowhite_file;};
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227 WHITELISTERP find_autowhite(const char *from, const char *to);
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228
278
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229 void set_default_rate_limit(int limit) {default_rate_limit = limit;};
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230 void set_default_address_limit(int limit) {default_address_limit = limit;};
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231 void set_daily_rate_multiple(int multiple) {daily_rate_multiple = multiple;};
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232 void set_daily_address_multiple(int multiple) {daily_address_multiple = multiple;};
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233 void add_rate_limit(const char *user, int limit) {rcpt_per_hour[user] = limit;};
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234 void add_address_limit(const char *user, int limit) {addresses_per_hour[user] = limit;};
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235 int find_rate_limit(const char *user); // recipients per hour/day
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236 int find_address_limit(const char *user); // unique ip address connections per hour/day
259
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237 bool is_unauthenticated_limited(const char *user);
278
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238 int get_daily_rate_multiple() {return daily_rate_multiple;};
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239 int get_daily_address_multiple() {return daily_address_multiple;};
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240
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241 void add_to(const char *to) {env_to.insert(to);};
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242 void add_from(const char *from, const char *status) {env_from[from] = status;};
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243 void add_from_context(const char *from, CONTEXTP con) {env_from_context[from] = con;};
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244 void set_from_default(const char *status) {env_from_default = status;};
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245 const char* find_from(const char *from, bool update_white = false, const char *queueid = NULL);
214
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246 CONTEXTP find_context(const char *from);
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247 CONTEXTP find_from_context_name(const char *name);
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248
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249 void set_content_filtering(bool filter) {content_filtering = filter; };
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250 void set_content_suffix(const char *suffix) {content_suffix = suffix; };
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251 void set_content_message(const char *message) {content_message = message; };
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252 void set_uribl_suffix(const char *suffix) {uribl_suffix = suffix; };
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253 void set_uribl_message(const char *message) {uribl_message = message; };
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254 void add_ignore(const char *host) {content_host_ignore.insert(host);};
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255 void add_tld(const char *tld) {content_tlds.insert(tld); };
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256 void add_tldwild(const char *tld) {content_tldwilds.insert(tld); };
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257 void add_tldnot(const char *tld) {content_tldnots.insert(tld); };
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258
214
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259 void set_host_limit(int limit) {host_limit = limit; };
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260 void set_host_message(const char *message) {host_limit_message = message;};
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261 void set_host_random(bool random) {host_random = random; };
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262 void set_spamassassin_limit(int limit) {spamassassin_limit = limit; };
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263 void set_tag_limit(int limit) {tag_limit = limit; };
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264 void set_tag_message(const char *message) {tag_limit_message = message;};
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265 void add_tag(const char *tag) {html_tags.insert(tag); };
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diff changeset
266
321
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267 const char *find_dkim_signer(const char *name);
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268 void add_dkim_signer(const char *signer, const char *action)
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269 {dkim_signer_names[signer] = action;};
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270 DKIMP find_dkim_from(const char *name);
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271 void add_dkim_from(const char *from, const char *action, const char *signer)
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272 {dkim_from_names[from] = new DKIM(action,signer);};
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273
214
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274 void add_dnsbl(const char *name, DNSBLP dns) {dnsbl_names[name] = dns; };
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275 void add_dnsbl(DNSBLP dns) {dnsbl_list.push_back(dns);};
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diff changeset
276 DNSBLP find_dnsbl(const char *name);
255
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277 void set_dnsbll_parsed() {dnsbl_list_parsed = true;};
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278
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279 void add_dnswl(const char *name, DNSWLP dns) {dnswl_names[name] = dns; };
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280 void add_dnswl(DNSWLP dns) {dnswl_list.push_back(dns);};
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281 DNSWLP find_dnswl(const char *name);
255
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282 void set_dnswll_parsed() {dnswl_list_parsed = true;};
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283
233
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284 bool set_white(const char *regx);
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285 bool white_match(const char *from);
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286
214
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287 bool set_generic(const char *regx, const char *msg);
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288 const char* generic_match(const char *client);
168
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289
214
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diff changeset
290 void set_require(bool r) {require_match = r; };
268
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291 void set_requirerdns(bool r) {require_rdns = r; };
214
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diff changeset
292 void set_grey(bool g) {dcc_greylist = g; };
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diff changeset
293 void set_bulk(int b) {dcc_bulk_threshold = b; };
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294
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295 bool get_content_filtering() {return content_filtering; };
214
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296 bool get_require() {return content_filtering && require_match; };
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297 bool get_requirerdns() {return require_rdns; };
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298 bool get_grey() {return content_filtering && dcc_greylist; };
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299 int get_bulk() {return (content_filtering) ? dcc_bulk_threshold : 0;};
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300 int get_host_limit() {return (content_filtering) ? host_limit : 0;};
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301 bool get_host_random() {return (content_filtering) ? host_random : 0;};
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302 int get_spamassassin_limit() {return (content_filtering) ? spamassassin_limit : 0;};
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diff changeset
303 const char* get_content_suffix();
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diff changeset
304 const char* get_content_message();
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diff changeset
305 const char* get_uribl_suffix();
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diff changeset
306 const char* get_uribl_message();
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diff changeset
307 string_set& get_content_host_ignore();
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diff changeset
308 string_set& get_content_tlds();
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diff changeset
309 string_set& get_content_tldwilds();
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diff changeset
310 string_set& get_content_tldnots();
214
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diff changeset
311 string_set& get_html_tags();
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diff changeset
312 dnsblp_list& get_dnsbl_list();
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diff changeset
313 dnswlp_list& get_dnswl_list();
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diff changeset
314
322
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diff changeset
315 bool acceptable_content(recorder &memory, int score, int bulk, const char *signer, const char *from, string& msg);
214
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diff changeset
316 bool ignore_host(const char *host);
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317
214
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diff changeset
318 void dump(bool isdefault, bool &spamass, int level = 0);
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319 };
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320
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321
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diff changeset
322 struct CONFIG {
214
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diff changeset
323 // the only mutable stuff once it has been loaded from the config file
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diff changeset
324 int reference_count; // protected by the global config_mutex
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diff changeset
325 // all the rest is constant after loading from the config file
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diff changeset
326 int generation;
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diff changeset
327 time_t load_time;
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diff changeset
328 string_set config_files;
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diff changeset
329 context_list contexts; // owns all the contexts, not just top level contexts
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diff changeset
330 context_map env_to; // map recipient to a filtering context
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diff changeset
331 CONTEXTP default_context;// for env_to values that don't have their own specific filtering context
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diff changeset
332 // the default context is also used for some of the content filtering values
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diff changeset
333
214
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diff changeset
334 CONFIG();
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diff changeset
335 ~CONFIG();
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diff changeset
336 void add_context(CONTEXTP con);
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diff changeset
337 void add_to(const char *to, CONTEXTP con);
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diff changeset
338 CONTEXTP find_context(const char *to);
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diff changeset
339 void dump();
94
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diff changeset
340 };
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diff changeset
341
136
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diff changeset
342
270
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diff changeset
343 extern const char *token_asterisk;
214
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diff changeset
344 extern const char *token_autowhite;
270
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diff changeset
345 extern const char *token_bang;
214
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diff changeset
346 extern const char *token_black;
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diff changeset
347 extern const char *token_content;
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diff changeset
348 extern const char *token_context;
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diff changeset
349 extern const char *token_dccbulk;
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diff changeset
350 extern const char *token_dccfrom;
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diff changeset
351 extern const char *token_dccgrey;
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diff changeset
352 extern const char *token_dccto;
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diff changeset
353 extern const char *token_default;
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diff changeset
354 extern const char *token_dnsbl;
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diff changeset
355 extern const char *token_dnsbll;
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diff changeset
356 extern const char *token_dnswl;
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357 extern const char *token_dnswll;
214
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diff changeset
358 extern const char *token_envfrom;
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diff changeset
359 extern const char *token_envto;
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diff changeset
360 extern const char *token_filter;
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diff changeset
361 extern const char *token_generic;
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diff changeset
362 extern const char *token_host_limit;
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diff changeset
363 extern const char *token_html_limit;
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diff changeset
364 extern const char *token_html_tags;
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diff changeset
365 extern const char *token_ignore;
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diff changeset
366 extern const char *token_include;
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diff changeset
367 extern const char *token_inherit;
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diff changeset
368 extern const char *token_lbrace;
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diff changeset
369 extern const char *token_mailhost;
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diff changeset
370 extern const char *token_many;
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diff changeset
371 extern const char *token_no;
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diff changeset
372 extern const char *token_off;
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diff changeset
373 extern const char *token_ok;
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diff changeset
374 extern const char *token_ok2;
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diff changeset
375 extern const char *token_on;
270
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diff changeset
376 extern const char *token_period;
214
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diff changeset
377 extern const char *token_rate;
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diff changeset
378 extern const char *token_rbrace;
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diff changeset
379 extern const char *token_require;
268
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diff changeset
380 extern const char *token_requirerdns;
214
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diff changeset
381 extern const char *token_semi;
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diff changeset
382 extern const char *token_soft;
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diff changeset
383 extern const char *token_spamassassin;
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diff changeset
384 extern const char *token_substitute;
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diff changeset
385 extern const char *token_tld;
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diff changeset
386 extern const char *token_unknown;
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diff changeset
387 extern const char *token_uribl;
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Carl Byington <carl@five-ten-sg.com>
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diff changeset
388 extern const char *token_verify;
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diff changeset
389 extern const char *token_white;
233
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diff changeset
390 extern const char *token_white_regex;
214
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parents: 192
diff changeset
391 extern const char *token_yes;
322
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diff changeset
392 extern const char *token_dkim_signer;
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diff changeset
393 extern const char *token_dkim_from;
321
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diff changeset
394 extern const char *token_signed_white;
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diff changeset
395 extern const char *token_signed_black;
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diff changeset
396 extern const char *token_require_signed;
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397 extern const char *token_myhostname;
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398
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399 extern pthread_mutex_t verifier_mutex; // protect the verifier map
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400 extern pthread_mutex_t whitelister_mutex; // protect the
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401
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402 void discard(string_set &s);
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403 const char* register_string(string_set &s, const char *name);
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404 const char* register_string(const char *name);
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405 void clear_strings();
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406 bool load_conf(CONFIG &dc, const char *fn);
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407 void* verify_closer(void *arg);
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408 void* whitelister_writer(void *arg);
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409 void token_init();
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410
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411 #endif