annotate src/context.h @ 144:31ff00ea6bfb stable-5-24

allow parent/child to share a fully qualified env_to address
author carl
date Sun, 15 Oct 2006 12:23:17 -0700
parents ecb40aa3eaa5
children c7fc218686f5
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1 /*
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2
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3 Copyright (c) 2006 Carl Byington - 510 Software Group, released under
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4 the GPL version 2 or any later version at your choice available at
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5 http://www.fsf.org/licenses/gpl.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 #include "tokenizer.h"
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13 #include <map>
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14
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15
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16 enum status {oksofar, // not rejected yet
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17 white, // whitelisted
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18 black, // blacklisted
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19 reject}; // rejected by a dns list
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20
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21 class DNSBL;
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22 class CONTEXT;
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23 class VERIFY;
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24 class SMTP;
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25 class recorder;
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26
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27 typedef map<char *, char *, ltstr> string_map;
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28 typedef set<int> int_set;
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29 typedef list<SMTP *> smtp_list;
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30 typedef list<char *> string_list;
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31 typedef DNSBL * DNSBLP;
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32 typedef VERIFY * VERIFYP;
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33 typedef list<DNSBLP> dnsblp_list;
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34 typedef map<char *, DNSBLP, ltstr> dnsblp_map;
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35 typedef CONTEXT * CONTEXTP;
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36 typedef list<CONTEXTP> context_list;
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37 typedef map<char *, CONTEXTP, ltstr> context_map;
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38 typedef map<char *, int, ltstr> ns_mapper;
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39 typedef map<char *, int, ltstr> rcpt_rates;
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40 typedef map<char *, VERIFYP, ltstr> verify_map;
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41
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42 class SMTP {
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43 static const int maxlen = 1000;
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44 int fd;
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45 bool error;
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46 time_t stamp;
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47 char efrom[maxlen]; // last envelope from sent on this socket
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48 int pending; // unread bytes in buffer, not including the null terminator
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49 char buffer[maxlen];
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50 public:
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51 SMTP(int f) {fd = f; error = false; now(); efrom[0] = '\0'; init();};
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52 ~SMTP() {if (!error) quit(); closefd();};
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53 void init() {pending = 0; buffer[0] = '\0';};
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54 void append(char *c) {strncat(buffer, c, max(0, maxlen-1-(int)strlen(c)));};
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55 bool err() {return error;};
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56 void now() {stamp = time(NULL);};
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57 time_t get_stamp() {return stamp;};
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58 int get_fd() {return fd;};
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59 int writer();
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60 int reader();
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61 int read_line();
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62 int read_response();
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63 void flush_line(int r);
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64 int cmd(char *c);
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65 int helo();
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66 int rset();
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67 int from(char *f);
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68 int rcpt(char *t);
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69 int quit();
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70 void closefd();
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71 #ifdef VERIFY_DEBUG
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72 static void log(char *m, int v);
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73 static void log(char *m, char *v);
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74 #endif
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75 };
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76
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77 class VERIFY {
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78 char *host; // host to be used to verify recipient addresses
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79 time_t last_err; // time of last socket error
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80 pthread_mutex_t mutex; // protect the lists of sockets and timestamps
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81 smtp_list connections;// open sockets, ready to be used
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82 public:
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83 VERIFY(char *h);
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84 void closer(); // if the oldest socket is ancient, close it
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85 SMTP *get_connection();
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86 void put_connection(SMTP *conn);
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87 bool ok(char *from, char *to);
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88 };
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89
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90 struct DNSBL {
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91 char *name; // nickname for this dns based list
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92 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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93 char *message; // error message with one or two %s operators for the ip address replacement
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94 DNSBL(char *n, char *s, char *m);
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95 bool operator==(const DNSBL &rhs);
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96 };
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97
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98 class CONTEXT {
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99 CONTEXTP parent;
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100 char * name;
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101 context_map children; // map child context names to their contexts
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102 string_set env_to; // this context applies to these envelope recipients
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103 char * verify_host; // use this smtp host to verify email addresses
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104 string_map env_from; // map senders to white/black/unknown
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105 context_map env_from_context; // map senders to a child context
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106 char * env_from_default; // default value for senders that are not found in the map white/black/unknown/inherit
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107 bool content_filtering; //
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108 char * content_suffix; // for url body filtering based on ip addresses of hostnames in the body
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109 char * content_message; // ""
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110 char * uribl_suffix; // for uribl body filtering based on hostnames in the body
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111 char * uribl_message; // ""
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112 string_set content_host_ignore;// hosts to ignore for content sbl checking
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113 string_set content_tlds; //
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114 string_set content_cctlds; //
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115 string_set html_tags; // set of valid html tags
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116 int host_limit; // limit on host names
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117 char * host_limit_message; // error message for excessive host names
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118 bool host_random; // pick a random selection of host names rather than error for excessive hosts
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119 int tag_limit; // limit on bad html tags
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120 char * tag_limit_message; // error message for excessive bad html tags
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121 dnsblp_map dnsbl_names; // name to dnsbl mapping for lists that are available in this context and children
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122 dnsblp_list dnsbl_list; // list of dnsbls to be used in this context
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123 int default_rcpt_rate; // if not specified per user
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124 rcpt_rates rcpt_per_hour; // per user limits on number of recipients per hour
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125
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126
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127 public:
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128 CONTEXT(CONTEXTP parent_, char *name_);
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129 ~CONTEXT();
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130 CONTEXTP get_parent() {return parent;};
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131 bool is_parent(CONTEXTP p); // is p a parent of this?
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132 char* get_full_name(char *buf, int size);
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133 void add_context(CONTEXTP child) {children[child->name] = child;};
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134 bool allow_env_to(char *to) {return (parent) ? parent->cover_env_to(to) : true;};
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135 bool cover_env_to(char *to);
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136
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137 void set_verify(char *host) {verify_host = host;};
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138 char* get_verify() {return verify_host;};
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139 VERIFYP find_verify(char *to);
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140
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141 void set_default_rate(int limit) {default_rcpt_rate = limit;};
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142 void add_rate(char *user, int limit) {rcpt_per_hour[user] = limit;};
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143 int find_rate(char *user);
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144
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145 void add_to(char *to) {env_to.insert(to);};
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146 void add_from(char *from, char *status) {env_from[from] = status;};
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147 void add_from_context(char *from, CONTEXTP con) {env_from_context[from] = con;};
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148 void set_from_default(char *status) {env_from_default = status;};
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149 char* find_from(char *from);
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150 CONTEXTP find_context(char *from);
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151 CONTEXTP find_from_context_name(char *name);
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152
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153 void set_content_filtering(bool filter) {content_filtering = filter;};
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154 void set_content_suffix(char *suffix) {content_suffix = suffix;};
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155 void set_content_message(char *message) {content_message = message;};
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156 void set_uribl_suffix(char *suffix) {uribl_suffix = suffix;};
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157 void set_uribl_message(char *message) {uribl_message = message;};
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158 void add_ignore(char *host) {content_host_ignore.insert(host);};
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159 void add_tld(char *tld) {content_tlds.insert(tld);};
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160 void add_cctld(char *cctld) {content_cctlds.insert(cctld);};
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161
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162 void set_host_limit(int limit) {host_limit = limit;};
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163 void set_host_message(char *message) {host_limit_message = message;};
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164 void set_host_random(bool random) {host_random = random;};
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165 void set_tag_limit(int limit) {tag_limit = limit;};
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166 void set_tag_message(char *message) {tag_limit_message = message;};
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167 void add_tag(char *tag) {html_tags.insert(tag);};
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168
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169 void add_dnsbl(char *name, DNSBLP dns) {dnsbl_names[name] = dns;};
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170 void add_dnsbl(DNSBLP dns) {dnsbl_list.push_back(dns);};
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171 DNSBLP find_dnsbl(char *name);
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172
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173 bool get_content_filtering() {return content_filtering;};
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174 int get_host_limit() {return host_limit;};
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175 bool get_host_random() {return host_random;};
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176 char* get_content_suffix();
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177 char* get_content_message();
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178 char* get_uribl_suffix();
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179 char* get_uribl_message();
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180 string_set& get_content_host_ignore();
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181 string_set& get_content_tlds();
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182 string_set& get_content_cctlds();
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183 string_set& get_html_tags();
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184 dnsblp_list& get_dnsbl_list();
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185
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186 bool acceptable_content(recorder &memory, char *&msg);
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187 bool ignore_host(char *host);
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188
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189 void dump(bool isdefault, int level = 0);
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190 };
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191
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192
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193 struct CONFIG {
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194 // the only mutable stuff once it has been loaded from the config file
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195 int reference_count; // protected by the global config_mutex
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196 // all the rest is constant after loading from the config file
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197 int generation;
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198 time_t load_time;
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199 string_set config_files;
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200 context_list contexts; // owns all the contexts, not just top level contexts
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201 context_map env_to; // map recipient to a filtering context
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202 CONTEXTP default_context;// for env_to values that don't have their own specific filtering context
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203 // the default context is also used for some of the content filtering values
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204
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205 CONFIG();
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206 ~CONFIG();
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207 void add_context(CONTEXTP con);
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208 void add_to(char *to, CONTEXTP con);
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209 CONTEXTP find_context(char *to);
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210 void dump();
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211 };
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212
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213 struct RATELIMIT {
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214
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215 };
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216
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217 extern char *token_black;
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218 extern char *token_cctld;
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219 extern char *token_content;
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220 extern char *token_context;
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221 extern char *token_dccfrom;
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222 extern char *token_dccto;
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223 extern char *token_default;
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224 extern char *token_dnsbl;
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225 extern char *token_dnsbll;
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226 extern char *token_envfrom;
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227 extern char *token_envto;
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228 extern char *token_filter;
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229 extern char *token_host_limit;
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230 extern char *token_html_limit;
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231 extern char *token_html_tags;
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232 extern char *token_ignore;
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233 extern char *token_include;
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234 extern char *token_inherit;
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235 extern char *token_lbrace;
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236 extern char *token_mailhost;
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237 extern char *token_many;
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238 extern char *token_off;
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239 extern char *token_ok2;
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240 extern char *token_ok;
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241 extern char *token_on;
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242 extern char *token_rate;
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243 extern char *token_rbrace;
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244 extern char *token_semi;
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245 extern char *token_soft;
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246 extern char *token_substitute;
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247 extern char *token_tld;
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248 extern char *token_unknown;
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249 extern char *token_uribl;
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250 extern char *token_white;
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251
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252 extern char *token_myhostname;
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253
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254 extern verify_map verifiers; // map of smtp hosts to verify structures, owns all the verify structures
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255 extern string_set all_strings; // owns all the strings, only modified by the config loader thread
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256
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257 void discard(string_set &s);
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258 char* register_string(string_set &s, char *name);
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259 char* register_string(char *name);
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260 CONFIG *parse_config(char *fn);
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261 bool load_conf(CONFIG &dc, char *fn);
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262 void add_verify_host(char *host);
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263 void* verify_closer(void *arg);
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264 void token_init();
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265
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266 #endif