Mercurial > dnsbl

annotate src/context.h @ 225:8e1cbf3d96fc stable-6-0-20

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simple dns lookup failure need not kill the resolver process
author Carl Byington <carl@five-ten-sg.com>
date Mon, 29 Dec 2008 18:12:22 -0800
parents 82886d4dd71f
children 5c3e9bf45bb5
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1 /*
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2
152
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
214
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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 CONTEXT;
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19 class VERIFY;
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20 class SMTP;
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21 class WHITELISTER;
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22 class DELAYWHITE;
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23 class recorder;
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24
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25 typedef map<const char *, const char *, ltstr> string_map;
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26 typedef set<int> int_set;
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27 typedef list<SMTP *> smtp_list;
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28 typedef DNSBL * DNSBLP;
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29 typedef VERIFY * VERIFYP;
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30 typedef WHITELISTER * WHITELISTERP;
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31 typedef DELAYWHITE * DELAYWHITEP;
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32 typedef list<DNSBLP> dnsblp_list;
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33 typedef map<const char *, DNSBLP, ltstr> dnsblp_map;
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34 typedef CONTEXT * CONTEXTP;
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35 typedef list<CONTEXTP> context_list;
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36 typedef map<const char *, CONTEXTP, ltstr> context_map;
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37 typedef map<const char *, int, ltstr> ns_mapper;
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38 typedef map<const char *, int, ltstr> rcpt_rates;
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39 typedef map<const char *, time_t, ltstr> autowhite_sent;
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40 typedef map<const char *, VERIFYP, ltstr> verify_map;
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41 typedef map<const char *, WHITELISTERP, ltstr> whitelister_map;
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42 typedef list<DELAYWHITEP> delay_whitelist;
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43
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44 class SMTP {
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45 static const int maxlen = 1000;
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46 int fd;
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47 bool error;
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48 time_t stamp;
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49 char efrom[maxlen]; // last envelope from sent on this socket
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50 int pending; // unread bytes in buffer, not including the null terminator
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51 char buffer[maxlen];
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52 public:
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53 SMTP(int f) {fd = f; error = false; now(); efrom[0] = '\0'; init();};
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54 ~SMTP() {if (!error) quit(); closefd();};
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55 void init() {pending = 0; buffer[0] = '\0';};
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56 void append(const char *c) {strncat(buffer, c, max(0, maxlen-1-(int)strlen(c)));};
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57 bool err() {return error;};
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58 void now() {stamp = time(NULL);};
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59 time_t get_stamp() {return stamp;};
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60 int get_fd() {return fd;};
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61 int writer();
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62 int reader();
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63 int read_line();
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64 int read_response();
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65 void flush_line(int r);
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66 int cmd(const char *c);
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67 int helo();
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68 int rset();
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69 int from(const char *f);
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70 int rcpt(const char *t);
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71 int quit();
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72 void closefd();
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73 #ifdef VERIFY_DEBUG
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74 static void log(const char *m, int v);
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75 static void log(const char *m, const char *v);
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76 #endif
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77 };
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78
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79 class VERIFY {
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80 const char *host; // host to be used to verify recipient addresses
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81 time_t last_err; // time of last socket error
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82 pthread_mutex_t mutex; // protect the lists of sockets and timestamps
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83 smtp_list connections;// open sockets, ready to be used
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84 public:
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85 VERIFY(const char *h);
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86 void closer(); // if the oldest socket is ancient, close it
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87 SMTP *get_connection();
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88 void put_connection(SMTP *conn);
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89 bool ok(const char *from, const char *to);
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90 };
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91
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92 class WHITELISTER {
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93 const char *fn; // file to use
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94 int days; // how long do we keep entries
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95 pthread_mutex_t mutex; // protect the flag and map
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96 time_t loaded; // when we loaded this file
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97 bool need; // force writing on new entries
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98 autowhite_sent rcpts; // recipient map to remember when we sent them mail
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99 public:
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100 WHITELISTER(const char *f, int d);
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101 void merge();
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102 void writer(); // dump any changes back to the file
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103 void sent(const char *to);
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104 bool is_white(const char *from); // should we white list this sender (did we send them anything recently)
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105 int get_days() {return days;};
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106 void set_days(int d) {days = d;};
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107 };
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108
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109 class DELAYWHITE {
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110 const char *loto;
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111 WHITELISTERP w;
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112 CONTEXTP con;
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113 public:
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114 DELAYWHITE(const char *loto_, WHITELISTERP w_, CONTEXTP con_);
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115 const char *get_loto() {return loto;};
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116 WHITELISTERP get_w() {return w;};
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117 CONTEXTP get_con() {return con;};
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118 };
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119
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120 struct DNSBL {
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121 const char *name; // nickname for this dns based list
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122 const char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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123 const char *message; // error message with one or two %s operators for the ip address replacement
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124 DNSBL(const char *n, const char *s, const char *m);
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125 bool operator==(const DNSBL &rhs);
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126 };
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127
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128 class CONTEXT {
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129 CONTEXTP parent;
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130 const char * name;
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131 context_map children; // map child context names to their contexts
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132 string_set env_to; // this context applies to these envelope recipients
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133 const char * verify_host; // use this smtp host to verify email addresses
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134 VERIFYP verifier; // pointer to the verifier structure
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135 const char * generic_regx; // pointer to generic regular expression
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136 const char * generic_message; // pointer to generic message with one %s
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137 regex_t generic_pattern; // compiled regex pattern
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138 const char * autowhite_file; // file to use for automatic whitelisting
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139 WHITELISTERP whitelister; // pointer to the auto whitelister structure
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140 string_map env_from; // map senders to white/black/unknown
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141 context_map env_from_context; // map senders to a child context
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142 const char * env_from_default; // default value for senders that are not found in the map white/black/unknown/inherit
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143 bool content_filtering; //
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144 const char * content_suffix; // for url body filtering based on ip addresses of hostnames in the body
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145 const char * content_message; // ""
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146 const char * uribl_suffix; // for uribl body filtering based on hostnames in the body
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147 const char * uribl_message; // ""
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148 string_set content_host_ignore;// hosts to ignore for content sbl checking
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149 string_set content_tlds; //
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150 string_set content_cctlds; //
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151 string_set html_tags; // set of valid html tags
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152 int host_limit; // limit on host names
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153 const char * host_limit_message; // error message for excessive host names
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154 bool host_random; // pick a random selection of host names rather than error for excessive hosts
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155 int tag_limit; // limit on bad html tags
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156 const char * tag_limit_message; // error message for excessive bad html tags
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157 int spamassassin_limit; // max score from spamassassin
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158 bool require_match; // require matching context filtering context
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159 bool dcc_greylist; // should we do dcc greylisting?
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160 int dcc_bulk_threshold; // off = 0, many = 1000
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161 dnsblp_map dnsbl_names; // name to dnsbl mapping for lists that are available in this context and children
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162 dnsblp_list dnsbl_list; // list of dnsbls to be used in this context
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163 int default_rcpt_rate; // if not specified per user
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164 rcpt_rates rcpt_per_hour; // per user limits on number of recipients per hour
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165
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166
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167 public:
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168 CONTEXT(CONTEXTP parent_, const char *name_);
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169 ~CONTEXT();
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170 CONTEXTP get_parent() {return parent;};
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171 bool is_parent(CONTEXTP p); // is p a parent of this?
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172 const char* get_full_name(char *buffer, int size);
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173 void add_context(CONTEXTP child) {children[child->name] = child;};
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174 bool allow_env_to(const char *to) {return (parent) ? parent->cover_env_to(to) : true;};
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175 bool cover_env_to(const char *to);
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176
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177 void set_verifier(VERIFYP v) {verifier = v;};
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178 void set_verify(const char *host) {verify_host = host;};
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179 const char* get_verify() {return verify_host;};
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180 VERIFYP find_verify(const char *to);
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181
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182
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183 void set_whitelister(WHITELISTERP v) {whitelister = v;};
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184 void set_autowhite(const char *fn) {autowhite_file = fn;};
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185 const char* get_autowhite() {return autowhite_file;};
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186 WHITELISTERP find_autowhite(const char *from, const char *to);
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187
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188 void set_default_rate(int limit) {default_rcpt_rate = limit;};
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189 void add_rate(const char *user, int limit) {rcpt_per_hour[user] = limit;};
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190 int find_rate(const char *user);
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191
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192 void add_to(const char *to) {env_to.insert(to);};
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193 void add_from(const char *from, const char *status) {env_from[from] = status;};
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194 void add_from_context(const char *from, CONTEXTP con) {env_from_context[from] = con;};
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195 void set_from_default(const char *status) {env_from_default = status;};
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196 const char* find_from(const char *from, bool update_white = false);
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197 CONTEXTP find_context(const char *from);
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198 CONTEXTP find_from_context_name(const char *name);
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199
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200 void set_content_filtering(bool filter) {content_filtering = filter; };
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201 void set_content_suffix(const char *suffix) {content_suffix = suffix; };
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202 void set_content_message(const char *message) {content_message = message; };
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203 void set_uribl_suffix(const char *suffix) {uribl_suffix = suffix; };
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204 void set_uribl_message(const char *message) {uribl_message = message; };
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205 void add_ignore(const char *host) {content_host_ignore.insert(host);};
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206 void add_tld(const char *tld) {content_tlds.insert(tld); };
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207 void add_cctld(const char *cctld) {content_cctlds.insert(cctld); };
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208
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209 void set_host_limit(int limit) {host_limit = limit; };
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210 void set_host_message(const char *message) {host_limit_message = message;};
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211 void set_host_random(bool random) {host_random = random; };
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212 void set_spamassassin_limit(int limit) {spamassassin_limit = limit; };
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213 void set_tag_limit(int limit) {tag_limit = limit; };
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214 void set_tag_message(const char *message) {tag_limit_message = message;};
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215 void add_tag(const char *tag) {html_tags.insert(tag); };
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216
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217 void add_dnsbl(const char *name, DNSBLP dns) {dnsbl_names[name] = dns; };
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218 void add_dnsbl(DNSBLP dns) {dnsbl_list.push_back(dns);};
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219 DNSBLP find_dnsbl(const char *name);
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220
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221 bool set_generic(const char *regx, const char *msg);
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222 const char* generic_match(const char *client);
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223
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224 void set_require(bool r) {require_match = r; };
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225 void set_grey(bool g) {dcc_greylist = g; };
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226 void set_bulk(int b) {dcc_bulk_threshold = b; };
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227
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228 bool get_content_filtering() {return content_filtering; };
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229 bool get_require() {return content_filtering && require_match; };
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230 bool get_grey() {return content_filtering && dcc_greylist; };
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231 int get_bulk() {return (content_filtering) ? dcc_bulk_threshold : 0;};
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232 int get_host_limit() {return (content_filtering) ? host_limit : 0;};
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233 bool get_host_random() {return (content_filtering) ? host_random : 0;};
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234 int get_spamassassin_limit() {return (content_filtering) ? spamassassin_limit : 0;};
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235 const char* get_content_suffix();
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236 const char* get_content_message();
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237 const char* get_uribl_suffix();
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238 const char* get_uribl_message();
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239 string_set& get_content_host_ignore();
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240 string_set& get_content_tlds();
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241 string_set& get_content_cctlds();
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242 string_set& get_html_tags();
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243 dnsblp_list& get_dnsbl_list();
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244
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245 bool acceptable_content(recorder &memory, int score, int bulk, string& msg);
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246 bool ignore_host(const char *host);
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247
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248 void dump(bool isdefault, bool &spamass, int level = 0);
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249 };
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250
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251
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252 struct CONFIG {
214
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253 // the only mutable stuff once it has been loaded from the config file
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254 int reference_count; // protected by the global config_mutex
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255 // all the rest is constant after loading from the config file
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256 int generation;
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257 time_t load_time;
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258 string_set config_files;
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259 context_list contexts; // owns all the contexts, not just top level contexts
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260 context_map env_to; // map recipient to a filtering context
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261 CONTEXTP default_context;// for env_to values that don't have their own specific filtering context
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262 // the default context is also used for some of the content filtering values
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263
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264 CONFIG();
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265 ~CONFIG();
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266 void add_context(CONTEXTP con);
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267 void add_to(const char *to, CONTEXTP con);
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268 CONTEXTP find_context(const char *to);
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269 void dump();
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270 };
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271
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272
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273 extern const char *token_autowhite;
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274 extern const char *token_black;
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275 extern const char *token_cctld;
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276 extern const char *token_content;
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277 extern const char *token_context;
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278 extern const char *token_dccbulk;
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279 extern const char *token_dccfrom;
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280 extern const char *token_dccgrey;
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281 extern const char *token_dccto;
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282 extern const char *token_default;
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283 extern const char *token_dnsbl;
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284 extern const char *token_dnsbll;
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285 extern const char *token_envfrom;
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286 extern const char *token_envto;
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287 extern const char *token_filter;
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288 extern const char *token_generic;
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289 extern const char *token_host_limit;
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290 extern const char *token_html_limit;
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291 extern const char *token_html_tags;
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292 extern const char *token_ignore;
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293 extern const char *token_include;
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294 extern const char *token_inherit;
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295 extern const char *token_lbrace;
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296 extern const char *token_mailhost;
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297 extern const char *token_many;
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298 extern const char *token_no;
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299 extern const char *token_off;
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300 extern const char *token_ok;
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301 extern const char *token_ok2;
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302 extern const char *token_on;
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303 extern const char *token_rate;
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304 extern const char *token_rbrace;
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305 extern const char *token_require;
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306 extern const char *token_semi;
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307 extern const char *token_soft;
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308 extern const char *token_spamassassin;
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309 extern const char *token_substitute;
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310 extern const char *token_tld;
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311 extern const char *token_unknown;
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312 extern const char *token_uribl;
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313 extern const char *token_verify;
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314 extern const char *token_white;
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315 extern const char *token_yes;
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316
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317 extern pthread_mutex_t verifier_mutex; // protect the verifier map
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318 extern pthread_mutex_t whitelister_mutex; // protect the
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319
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320 void discard(string_set &s);
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321 const char* register_string(string_set &s, const char *name);
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322 const char* register_string(const char *name);
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323 void clear_strings();
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324 bool load_conf(CONFIG &dc, const char *fn);
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325 void* verify_closer(void *arg);
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326 void* whitelister_writer(void *arg);
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327 void token_init();
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328
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329 #endif