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0
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1 /*
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2
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3 Copyright (c) 2004 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 Based on a sample milter Copyright (c) 2000-2003 Sendmail, Inc. and its
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8 suppliers. Inspired by the DCC by Rhyolite Software
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9
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10 -p port The port through which the MTA will connect to this milter.
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11 -t sec The timeout value.
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12
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13 TODO:
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14
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15 1) Add "include-dcc NAME fn" to read a dcc whiteclnt file looking
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16 for many substitute mail-host domain, and add the equivalent "env_from
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17 domain black" into the NAME mapping. That allows clients to use just the
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18 DCC for white/blacklisting, but the backup mx machines can use dnsbl
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19 and get the same effect.
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20
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21 */
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22
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23
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24 // from sendmail sample
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25 #include <sys/types.h>
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26 #include <sys/stat.h>
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27 #include <errno.h>
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31 #include <sysexits.h>
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32 #include <unistd.h>
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33
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34 // needed for socket io
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35 #include <sys/ioctl.h>
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36 #include <net/if.h>
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37 #include <arpa/inet.h>
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38 #include <netinet/in.h>
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39 #include <netinet/tcp.h>
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40 #include <netdb.h>
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41 #include <sys/socket.h>
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42
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43 // needed for thread
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44 #include <pthread.h>
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45
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46 // needed for std c++ collections
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47 #include <set>
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48 #include <map>
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49 #include <list>
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50
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51 // for the dns resolver
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52 #include <netinet/in.h>
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53 #include <arpa/nameser.h>
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54 #include <resolv.h>
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55
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56 // misc stuff needed here
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57 #include <ctype.h>
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58 #include <fstream>
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59 #include <syslog.h>
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60
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61
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62 using namespace std;
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63
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64
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65 extern "C" {
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66 #include "libmilter/mfapi.h"
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67 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr);
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68 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv);
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69 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv);
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70 sfsistat mlfi_eom_or_abort(SMFICTX *ctx);
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71 sfsistat mlfi_close(SMFICTX *ctx);
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72 }
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73
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74 #ifndef bool
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75 # define bool int
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76 # define TRUE 1
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77 # define FALSE 0
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78 #endif /* ! bool */
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79
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80 struct ltstr {
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81 bool operator()(char* s1, char* s2) const {
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82 return strcmp(s1, s2) < 0;
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83 }
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84 };
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85
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86 struct DNSBL {
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87 char *suffix; // blacklist suffix like blackholes.five-ten-sg.com
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88 char *message; // error message with one or two %s operators for the ip address replacement
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89 DNSBL(char *s, char *m);
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90 };
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91 DNSBL::DNSBL(char *s, char *m) {
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92 suffix = s;
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93 message = m;
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94 }
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95
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96 typedef DNSBL * DNSBLP;
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97 typedef list<DNSBLP> DNSBLL;
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98 typedef DNSBLL * DNSBLLP;
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99 typedef map<char *, char *, ltstr> string_map;
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100 typedef map<char *, string_map *, ltstr> from_map;
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101 typedef map<char *, DNSBLP, ltstr> dnsblp_map;
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102 typedef map<char *, DNSBLLP, ltstr> dnsbllp_map;
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103 typedef set<char *, ltstr> string_set;
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104 typedef list<char *> string_list;
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105
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106 struct CONFIG {
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107 // the only mutable stuff once it has been loaded from the config file
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108 int reference_count; // protected by the global config_mutex
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109 // all the rest is constant after loading from the config file
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110 time_t load_time;
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111 string_list config_files;
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112 dnsblp_map dnsbls;
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113 dnsbllp_map dnsblls;
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114 from_map env_from;
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115 string_map env_to_dnsbll; // map recipient to a named dnsbll
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116 string_map env_to_chkfrom; // map recipient to a named from map
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117 CONFIG();
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118 ~CONFIG();
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119 };
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120 CONFIG::CONFIG() {
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121 reference_count = 0;
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122 load_time = 0;
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123 }
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124 CONFIG::~CONFIG() {
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125 for (dnsblp_map::iterator i=dnsbls.begin(); i!=dnsbls.end(); i++) {
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126 DNSBLP d = (*i).second;
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127 delete d;
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128 }
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129 for (dnsbllp_map::iterator i=dnsblls.begin(); i!=dnsblls.end(); i++) {
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130 DNSBLLP d = (*i).second;
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131 delete d;
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132 }
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133 for (from_map::iterator i=env_from.begin(); i!=env_from.end(); i++) {
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134 string_map *d = (*i).second;
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135 delete d;
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136 }
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137 }
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138
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139 static string_set all_strings; // owns all the strings, only modified by the config loader thread
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140 static CONFIG * config = NULL; // protected by the config_mutex
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141
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142 static pthread_mutex_t config_mutex;
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143 static pthread_mutex_t syslog_mutex;
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144 static pthread_mutex_t resolve_mutex;
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145
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146
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147
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148 ////////////////////////////////////////////////
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149 // predefined names
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150 //
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151 #define DEFAULT "default"
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152 #define WHITE "white"
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153 #define BLACK "black"
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154
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155
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156 ////////////////////////////////////////////////
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157 // mail filter private data, held for us by sendmail
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158 //
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159 enum status {oksofar, // not rejected yet
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160 white, // whitelisted by envelope from
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161 black, // blacklisted by envelope from or to
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162 reject}; // rejected by a dns list
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163 struct mlfiPriv
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164 {
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165 CONFIG *pc; // global context with our maps
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166 int ip; // ip4 address of the smtp client
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167 char *mailaddr; // envelope from value
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168 bool authenticated; // client authenticated? if so, suppress all dnsbl checks
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169 map<DNSBLP, status> checked; // status from those lists
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170 mlfiPriv();
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171 ~mlfiPriv();
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172 };
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173 mlfiPriv::mlfiPriv() {
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174 pthread_mutex_lock(&config_mutex);
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175 pc = config;
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176 pc->reference_count++;
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177 pthread_mutex_unlock(&config_mutex);
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178 ip = 0;
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179 mailaddr = NULL;
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180 }
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181 mlfiPriv::~mlfiPriv() {
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182 pthread_mutex_lock(&config_mutex);
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183 pc->reference_count--;
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184 pthread_mutex_unlock(&config_mutex);
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185 if (mailaddr) free(mailaddr);
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186 }
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187
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188 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx))
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189
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190
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191 ////////////////////////////////////////////////
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192 // syslog a message
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193 //
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194 static void my_syslog(char *text);
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195 static void my_syslog(char *text) {
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196 pthread_mutex_lock(&syslog_mutex);
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197 openlog("dnsbl", LOG_PID, LOG_MAIL);
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198 syslog(LOG_NOTICE, "%s", text);
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199 closelog();
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200 pthread_mutex_unlock(&syslog_mutex);
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201 }
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202
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203
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204 ////////////////////////////////////////////////
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205 // register a global string
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206 //
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207 static char* register_string(char *name);
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208 static char* register_string(char *name) {
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209 string_set::iterator i = all_strings.find(name);
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210 if (i != all_strings.end()) return *i;
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211 char *x = strdup(name);
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212 all_strings.insert(x);
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213 return x;
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214 }
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215
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216
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217 static char* next_token(char *delim);
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218 static char* next_token(char *delim) {
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219 char *name = strtok(NULL, delim);
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220 if (!name) return name;
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221 return register_string(name);
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222 }
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223
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224
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225 ////////////////////////////////////////////////
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226 // lookup an email address in the env_from or env_to maps
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227 //
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228 static char* lookup1(char *email, string_map map);
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229 static char* lookup1(char *email, string_map map) {
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230 string_map::iterator i = map.find(email);
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231 if (i != map.end()) return (*i).second;
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232 char *x = strchr(email, '@');
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233 if (!x) return DEFAULT;
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234 x++;
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235 i = map.find(x);
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236 if (i != map.end()) return (*i).second;
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237 return DEFAULT;
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238 }
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239
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240
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241 ////////////////////////////////////////////////
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242 // lookup an email address in the env_from or env_to maps
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243 // this email address is passed in from sendmail, and will
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244 // always be enclosed in <>. It may have mixed case, just
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245 // as the mail client sent it.
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246 //
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247 static char* lookup(char* email, string_map map);
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248 static char* lookup(char* email, string_map map) {
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249 int n = strlen(email)-2;
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250 if (n < 1) return DEFAULT; // malformed
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251 char *key = strdup(email+1);
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252 key[n] = '\0';
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253 for (int i=0; i<n; i++) key[i] = tolower(key[i]);
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254 char *rc = lookup1(key, map);
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255 free(key);
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256 return rc;
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257 }
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258
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259
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260 ////////////////////////////////////////////////
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261 // find the dnsbl with a specific name
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262 //
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263 static DNSBLP find_dnsbl(CONFIG &dc, char *name);
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264 static DNSBLP find_dnsbl(CONFIG &dc, char *name) {
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265 dnsblp_map::iterator i = dc.dnsbls.find(name);
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266 if (i == dc.dnsbls.end()) return NULL;
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267 return (*i).second;
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268 }
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269
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270
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271 ////////////////////////////////////////////////
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272 // find the dnsbll with a specific name
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273 //
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274 static DNSBLLP find_dnsbll(CONFIG &dc, char *name);
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275 static DNSBLLP find_dnsbll(CONFIG &dc, char *name) {
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276 dnsbllp_map::iterator i = dc.dnsblls.find(name);
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277 if (i == dc.dnsblls.end()) return NULL;
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278 return (*i).second;
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279 }
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280
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281
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282 ////////////////////////////////////////////////
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283 // find the envfrom map with a specific name
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284 //
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285 static string_map* find_from_map(CONFIG &dc, char *name);
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286 static string_map* find_from_map(CONFIG &dc, char *name) {
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287 from_map::iterator i = dc.env_from.find(name);
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288 if (i == dc.env_from.end()) return NULL;
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289 return (*i).second;
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290 }
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291
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292
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293 static string_map& really_find_from_map(CONFIG &dc, char *name);
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294 static string_map& really_find_from_map(CONFIG &dc, char *name) {
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295 string_map *sm = find_from_map(dc, name);
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296 if (!sm) {
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297 sm = new string_map;
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298 dc.env_from[name] = sm;
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299 }
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300 return *sm;
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301 }
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302
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303
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304 ////////////////////////////////////////////////
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305 // check a single dnsbl - we don't try very hard, just
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306 // using the default resolver retry settings. If we cannot
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307 // get an answer, we just accept the mail. The caller
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308 // must ensure thread safety.
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309 //
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310 static status check_single(int ip, DNSBL &bl);
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311 static status check_single(int ip, DNSBL &bl) {
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312 // make a dns question
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313 const u_char *src = (const u_char *)&ip;
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314 if (src[0] == 127) return oksofar; // don't do dns lookups on localhost
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315 char question[NS_MAXDNAME];
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316 snprintf(question, sizeof(question), "%u.%u.%u.%u.%s.", src[3], src[2], src[1], src[0], bl.suffix);
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317 // ask the question
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318 u_char answer[NS_PACKETSZ];
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319 int length = res_search(question, ns_c_in, ns_t_a, answer, sizeof(answer));
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320 if (length < 0) return oksofar; // error in getting answer
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321 // parse the answer
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322 ns_msg handle;
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323 ns_rr rr;
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324 if (ns_initparse(answer, length, &handle) != 0) return oksofar;
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325 int rrnum = 0;
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326 while (ns_parserr(&handle, ns_s_an, rrnum++, &rr) == 0) {
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327 if (ns_rr_type(rr) == ns_t_a) {
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328 // we see an A record, implies blacklisted ip address
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329 return reject;
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330 }
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331 }
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332 return oksofar;
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333 }
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334
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335
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336 ////////////////////////////////////////////////
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337 // check the dnsbls specified for this recipient
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338 //
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339 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist);
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340 static status check_dnsbl(mlfiPriv &priv, DNSBLLP dnsbllp, DNSBLP &rejectlist) {
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341 if (priv.authenticated) return oksofar;
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342 if (!dnsbllp) return oksofar;
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343 DNSBLL &dnsbll = *dnsbllp;
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344 for (DNSBLL::iterator i=dnsbll.begin(); i!=dnsbll.end(); i++) {
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345 DNSBLP dp = *i; // non null by construction
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346 status st;
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347 map<DNSBLP, status>::iterator f = priv.checked.find(dp);
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348 if (f == priv.checked.end()) {
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349 // have not checked this list yet
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350 pthread_mutex_lock(&resolve_mutex);
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351 st = check_single(priv.ip, *dp);
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352 pthread_mutex_unlock(&resolve_mutex);
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353 rejectlist = dp;
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354 priv.checked[dp] = st;
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355 }
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356 else {
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357 st = (*f).second;
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358 rejectlist = (*f).first;
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359 }
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360 if (st == reject) return st;
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361 }
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362 return oksofar;
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363 }
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364
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365
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366 ////////////////////////////////////////////////
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367 // start of sendmail milter interfaces
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368 //
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369 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr)
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370 {
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371 // allocate some private memory
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372 mlfiPriv *priv = new mlfiPriv;
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373 if (hostaddr->sa_family == AF_INET) {
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374 priv->ip = ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr;
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375 }
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376
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377 // save the private data
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378 smfi_setpriv(ctx, (void*)priv);
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379
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380 // continue processing
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381 return SMFIS_CONTINUE;
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382 }
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383
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384 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from)
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385 {
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386 mlfiPriv &priv = *MLFIPRIV;
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387 priv.mailaddr = strdup(from[0]);
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388 priv.authenticated = (smfi_getsymval(ctx, "{auth_authen}") != NULL);
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389 return SMFIS_CONTINUE;
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390 }
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391
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392 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt)
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393 {
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394 DNSBLP rejectlist = NULL; // list that caused the reject
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395 status st = oksofar;
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396 mlfiPriv &priv = *MLFIPRIV;
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397 CONFIG &dc = *priv.pc;
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398 char *rcptaddr = rcpt[0];
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399 char *dnsname = lookup(rcptaddr, dc.env_to_dnsbll);
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400 char *fromname = lookup(rcptaddr, dc.env_to_chkfrom);
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401 if ((strcmp(dnsname, BLACK) == 0) ||
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402 (strcmp(fromname, BLACK) == 0)) {
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403 st = black; // two options to blacklist this recipient
|
|
|
404 }
|
|
|
405 else if (strcmp(fromname, WHITE) == 0) {
|
|
|
406 st = white;
|
|
|
407 }
|
|
|
408 else {
|
|
|
409 // check an env_from map
|
|
|
410 string_map *sm = find_from_map(dc, fromname);
|
|
|
411 if (sm != NULL) {
|
|
|
412 fromname = lookup(priv.mailaddr, *sm); // returns default if name not in map
|
|
|
413 if (strcmp(fromname, BLACK) == 0) {
|
|
|
414 st = black; // blacklist this envelope from value
|
|
|
415 }
|
|
|
416 if (strcmp(fromname, WHITE) == 0) {
|
|
|
417 st = white; // blacklist this envelope from value
|
|
|
418 }
|
|
|
419 }
|
|
|
420 }
|
|
|
421 if ((st == oksofar) && (strcmp(dnsname, WHITE) != 0)) {
|
|
|
422 // check dns lists
|
|
|
423 st = check_dnsbl(priv, find_dnsbll(dc, dnsname), rejectlist);
|
|
|
424 }
|
|
|
425
|
|
|
426 if (st == reject) {
|
|
|
427 // reject the recipient based on some dnsbl
|
|
|
428 char adr[sizeof "255.255.255.255"];
|
|
|
429 adr[0] = '\0';
|
|
|
430 const char *rc = inet_ntop(AF_INET, (const u_char *)&priv.ip, adr, sizeof(adr));
|
|
|
431 char buf[2000];
|
|
|
432 snprintf(buf, sizeof(buf), rejectlist->message, adr, adr);
|
|
|
433 smfi_setreply(ctx, "550", "5.7.1", buf);
|
|
|
434 return SMFIS_REJECT;
|
|
|
435 }
|
|
|
436 else if (st == black) {
|
|
|
437 // reject the recipient based on blacklisting either from or to
|
|
|
438 smfi_setreply(ctx, "550", "5.7.1", "no such user");
|
|
|
439 return SMFIS_REJECT;
|
|
|
440 }
|
|
|
441 else {
|
|
|
442 // accept the recipient
|
|
|
443 return SMFIS_CONTINUE;
|
|
|
444 }
|
|
|
445 }
|
|
|
446
|
|
|
447 sfsistat mlfi_eom_or_abort(SMFICTX *ctx)
|
|
|
448 {
|
|
|
449 mlfiPriv &priv = *MLFIPRIV;
|
|
|
450 if (priv.mailaddr) {
|
|
|
451 free(priv.mailaddr);
|
|
|
452 priv.mailaddr = NULL;
|
|
|
453 }
|
|
|
454 return SMFIS_CONTINUE;
|
|
|
455 }
|
|
|
456
|
|
|
457 sfsistat mlfi_close(SMFICTX *ctx)
|
|
|
458 {
|
|
|
459 mlfiPriv *priv = MLFIPRIV;
|
|
|
460 if (!priv) return SMFIS_CONTINUE;
|
|
|
461 delete priv;
|
|
|
462 smfi_setpriv(ctx, NULL);
|
|
|
463 return SMFIS_CONTINUE;
|
|
|
464 }
|
|
|
465
|
|
|
466 struct smfiDesc smfilter =
|
|
|
467 {
|
|
|
468 "DNSBL", // filter name
|
|
|
469 SMFI_VERSION, // version code -- do not change
|
|
|
470 SMFIF_DELRCPT, // flags
|
|
|
471 mlfi_connect, // connection info filter
|
|
|
472 NULL, // SMTP HELO command filter
|
|
|
473 mlfi_envfrom, // envelope sender filter
|
|
|
474 mlfi_envrcpt, // envelope recipient filter
|
|
|
475 NULL, // header filter
|
|
|
476 NULL, // end of header
|
|
|
477 NULL, // body block filter
|
|
|
478 mlfi_eom_or_abort, // end of message
|
|
|
479 mlfi_eom_or_abort, // message aborted
|
|
|
480 mlfi_close, // connection cleanup
|
|
|
481 };
|
|
|
482
|
|
|
483
|
|
|
484 static void dumpit(char *name, string_map map);
|
|
|
485 static void dumpit(char *name, string_map map) {
|
|
|
486 fprintf(stderr, "\n");
|
|
|
487 for (string_map::iterator i=map.begin(); i!=map.end(); i++) {
|
|
|
488 fprintf(stderr, "%s %s->%s\n", name, (*i).first, (*i).second);
|
|
|
489 }
|
|
|
490 }
|
|
|
491
|
|
|
492
|
|
|
493 static void dumpit(from_map map);
|
|
|
494 static void dumpit(from_map map) {
|
|
|
495 fprintf(stderr, "\n");
|
|
|
496 for (from_map::iterator i=map.begin(); i!=map.end(); i++) {
|
|
|
497 fprintf(stderr, "envfrom map %s\n", (*i).first);
|
|
|
498 string_map *sm = (*i).second;
|
|
|
499 dumpit("envelope from", *sm);
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503
|
|
|
504 static void dumpit();
|
|
|
505 static void dumpit() {
|
|
|
506 CONFIG &dc = *config;
|
|
|
507 fprintf(stderr, "dnsbls\n");
|
|
|
508 for (dnsblp_map::iterator i=dc.dnsbls.begin(); i!=dc.dnsbls.end(); i++) {
|
|
|
509 fprintf(stderr, "%s %s %s\n", (*i).first, (*i).second->suffix, (*i).second->message);
|
|
|
510 }
|
|
|
511 fprintf(stderr, "dnsbl_lists\n");
|
|
|
512 for (dnsbllp_map::iterator i=dc.dnsblls.begin(); i!=dc.dnsblls.end(); i++) {
|
|
|
513 char *name = (*i).first;
|
|
|
514 DNSBLL &dl = *((*i).second);
|
|
|
515 fprintf(stderr, "%s", name);
|
|
|
516 for (DNSBLL::iterator j=dl.begin(); j!=dl.end(); j++) {
|
|
|
517 DNSBL &d = **j;
|
|
|
518 fprintf(stderr, " %s", d.suffix);
|
|
|
519 }
|
|
|
520 fprintf(stderr, "\n");
|
|
|
521 }
|
|
|
522 }
|
|
|
523
|
|
|
524
|
|
|
525 ////////////////////////////////////////////////
|
|
|
526 // load a single config file
|
|
|
527 //
|
|
|
528 static void load_conf(CONFIG &dc, char *fn);
|
|
|
529 static void load_conf(CONFIG &dc, char *fn) {
|
|
|
530 dc.config_files.push_back(fn);
|
|
|
531 map<char*, int, ltstr> commands;
|
|
|
532 enum {dummy, dnsbl, dnsbll, envfrom, envto, include};
|
|
|
533 commands["dnsbl" ] = dnsbl;
|
|
|
534 commands["dnsbl_list"] = dnsbll;
|
|
|
535 commands["env_from" ] = envfrom;
|
|
|
536 commands["env_to" ] = envto;
|
|
|
537 commands["include" ] = include;
|
|
|
538 const int LINE_SIZE = 2000;
|
|
|
539 ifstream is(fn);
|
|
|
540 if (is.fail()) return;
|
|
|
541 char line[LINE_SIZE];
|
|
|
542 char orig[LINE_SIZE];
|
|
|
543 char *delim = " \t";
|
|
|
544 int curline = 0;
|
|
|
545 while (!is.eof()) {
|
|
|
546 is.getline(line, LINE_SIZE);
|
|
|
547 snprintf(orig, sizeof(orig), "%s", line);
|
|
|
548 curline++;
|
|
|
549 int n = strlen(line);
|
|
|
550 for (int i=0; i<n; i++) line[i] = tolower(line[i]);
|
|
|
551 char *cmd = strtok(line, delim);
|
|
|
552 if (cmd && (cmd[0] != '#') && (cmd[0] != '\0')) {
|
|
|
553 // have a decent command
|
|
|
554 bool processed = false;
|
|
|
555 switch (commands[cmd]) {
|
|
|
556 case dnsbl: {
|
|
|
557 // have a new dnsbl to use
|
|
|
558 char *name = next_token(delim);
|
|
|
559 if (!name) break; // no name name
|
|
|
560 if (find_dnsbl(dc, name)) break; // duplicate entry
|
|
|
561 char *suff = strtok(NULL, delim);
|
|
|
562 if (!suff) break; // no dns suffic
|
|
|
563 char *msg = suff + strlen(suff);
|
|
|
564 if ((msg - line) >= strlen(orig)) break; // line ended with the dns suffix
|
|
|
565 msg = strchr(msg+1, '\'');
|
|
|
566 if (!msg) break; // no reply message template
|
|
|
567 msg++; // move over the leading '
|
|
|
568 if ((msg - line) >= strlen(orig)) break; // line ended with the leading quote
|
|
|
569 char *last = strchr(msg, '\'');
|
|
|
570 if (!last) break; // no trailing quote
|
|
|
571 *last = '\0'; // make it a null terminator
|
|
|
572 dc.dnsbls[name] = new DNSBL(register_string(suff), register_string(msg));
|
|
|
573 processed = true;
|
|
|
574 } break;
|
|
|
575
|
|
|
576 case dnsbll: {
|
|
|
577 // define a new combination of dnsbls
|
|
|
578 char *name = next_token(delim);
|
|
|
579 if (!name) break;
|
|
|
580 if (find_dnsbll(dc, name)) break; // duplicate entry
|
|
|
581 char *list = next_token(delim);
|
|
|
582 if (!list || (*list == '\0') || (*list == '#')) break;
|
|
|
583 DNSBLLP d = new DNSBLL;
|
|
|
584 DNSBLP p = find_dnsbl(dc, list);
|
|
|
585 if (p) d->push_back(p);
|
|
|
586 while (true) {
|
|
|
587 list = next_token(delim);
|
|
|
588 if (!list || (*list == '\0') || (*list == '#')) break;
|
|
|
589 DNSBLP p = find_dnsbl(dc, list);
|
|
|
590 if (p) d->push_back(p);
|
|
|
591 }
|
|
|
592 dc.dnsblls[name] = d;
|
|
|
593 processed = true;
|
|
|
594 } break;
|
|
|
595
|
|
|
596 case envfrom: {
|
|
|
597 // add an entry into the named string_map
|
|
|
598 char *name = next_token(delim);
|
|
|
599 if (!name) break;
|
|
|
600 char *from = next_token(delim);
|
|
|
601 if (!from) break;
|
|
|
602 char *list = next_token(delim);
|
|
|
603 if (!list) break;
|
|
|
604 if ((strcmp(list, WHITE) == 0) ||
|
|
|
605 (strcmp(list, BLACK) == 0)) {
|
|
|
606 string_map &fm = really_find_from_map(dc, name);
|
|
|
607 fm[from] = list;
|
|
|
608 processed = true;
|
|
|
609 }
|
|
|
610 else {
|
|
|
611 // list may be the name of a previously defined from_map
|
|
|
612 string_map *m = find_from_map(dc, list);
|
|
|
613 if (m && (strcmp(list,name) != 0)) {
|
|
|
614 string_map &pm = *m;
|
|
|
615 string_map &fm = really_find_from_map(dc, name);
|
|
|
616 fm.insert(pm.begin(), pm.end());
|
|
|
617 processed = true;
|
|
|
618 }
|
|
|
619 }
|
|
|
620 } break;
|
|
|
621
|
|
|
622 case envto: {
|
|
|
623 // define the dnsbl_list and env_from maps to use for this recipient
|
|
|
624 char *to = next_token(delim);
|
|
|
625 if (!to) break;
|
|
|
626 char *list = next_token(delim);
|
|
|
627 if (!list) break;
|
|
|
628 char *from = next_token(delim);
|
|
|
629 if (!from) break;
|
|
|
630 dc.env_to_dnsbll[to] = list;
|
|
|
631 dc.env_to_chkfrom[to] = from;
|
|
|
632 processed = true;
|
|
|
633 } break;
|
|
|
634
|
|
|
635 case include: {
|
|
|
636 char *fn = next_token(delim);
|
|
|
637 if (fn) {
|
|
|
638 bool ok = true;
|
|
|
639 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) {
|
|
|
640 char *f = *i;
|
|
|
641 if (strcmp(f, fn) == 0) {
|
|
|
642 my_syslog("recursive include file detected");
|
|
|
643 ok = false;
|
|
|
644 break;
|
|
|
645 }
|
|
|
646 }
|
|
|
647 if (ok) {
|
|
|
648 load_conf(dc, fn);
|
|
|
649 processed = true;
|
|
|
650 }
|
|
|
651 }
|
|
|
652 } break;
|
|
|
653
|
|
|
654 default: {
|
|
|
655 } break;
|
|
|
656 }
|
|
|
657 if (!processed) {
|
|
|
658 pthread_mutex_lock(&syslog_mutex);
|
|
|
659 openlog("dnsbl", LOG_PID, LOG_MAIL);
|
|
|
660 syslog(LOG_ERR, "ignoring file %s line %d : %s\n", fn, curline, orig);
|
|
|
661 closelog();
|
|
|
662 pthread_mutex_unlock(&syslog_mutex);
|
|
|
663 }
|
|
|
664 }
|
|
|
665 }
|
|
|
666 is.close();
|
|
|
667 }
|
|
|
668
|
|
|
669
|
|
|
670 ////////////////////////////////////////////////
|
|
|
671 // reload the config
|
|
|
672 //
|
|
|
673 static CONFIG* new_conf();
|
|
|
674 static CONFIG* new_conf() {
|
|
|
675 my_syslog("loading new configuration");
|
|
|
676 CONFIG *newc = new CONFIG;
|
|
|
677 load_conf(*newc, "dnsbl.conf");
|
|
|
678 newc->load_time = time(NULL);
|
|
|
679 return newc;
|
|
|
680 }
|
|
|
681
|
|
|
682
|
|
|
683 ////////////////////////////////////////////////
|
|
|
684 // thread to watch the old config files for changes
|
|
|
685 // and reload when needed. we also cleanup old
|
|
|
686 // configs whose reference count has gone to zero.
|
|
|
687 //
|
|
|
688 static void* config_loader(void *arg);
|
|
|
689 static void* config_loader(void *arg) {
|
|
|
690 typedef set<CONFIG *> configp_set;
|
|
|
691 configp_set old_configs;
|
|
|
692 while (true) {
|
|
|
693 sleep(180); // look for modifications every 3 minutes
|
|
|
694 CONFIG &dc = *config;
|
|
|
695 time_t then = dc.load_time;
|
|
|
696 struct stat st;
|
|
|
697 bool reload = false;
|
|
|
698 for (string_list::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) {
|
|
|
699 char *fn = *i;
|
|
|
700 if (stat(fn, &st)) reload = true; // file disappeared
|
|
|
701 else if (st.st_mtime > then) reload = true; // file modified
|
|
|
702 if (reload) break;
|
|
|
703 }
|
|
|
704 if (reload) {
|
|
|
705 CONFIG *newc = new_conf();
|
|
|
706 // replace the global config pointer
|
|
|
707 pthread_mutex_lock(&config_mutex);
|
|
|
708 CONFIG *old = config;
|
|
|
709 config = newc;
|
|
|
710 pthread_mutex_unlock(&config_mutex);
|
|
|
711 // dumpit(env_from);
|
|
|
712 // dumpit("envelope to dnsbl", env_to_dnsbl);
|
|
|
713 // dumpit("envelope to check from", env_to_chkfrom);
|
|
|
714 // dumpit();
|
|
|
715 if (old) old_configs.insert(old);
|
|
|
716 }
|
|
|
717 // now look for old configs with zero ref counts
|
|
|
718 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) {
|
|
|
719 CONFIG *old = *i;
|
|
|
720 if (!old->reference_count) {
|
|
|
721 delete old; // destructor does all the work
|
|
|
722 old_configs.erase(i++);
|
|
|
723 }
|
|
|
724 else i++;
|
|
|
725 }
|
|
|
726 }
|
|
|
727 }
|
|
|
728
|
|
|
729
|
|
|
730 static void usage(char *prog);
|
|
|
731 static void usage(char *prog)
|
|
|
732 {
|
|
|
733 fprintf(stderr, "Usage: %s -p socket-addr [-t timeout]\n", prog);
|
|
|
734 fprintf(stderr, "where socket-addr is for the connection to sendmail and should be one of\n");
|
|
|
735 fprintf(stderr, " inet:port@local-ip-address\n");
|
|
|
736 fprintf(stderr, " local:local-domain-socket-file-name\n");
|
|
|
737 }
|
|
|
738
|
|
|
739
|
|
|
740 int main(int argc, char**argv)
|
|
|
741 {
|
|
|
742 bool setconn = FALSE;
|
|
|
743 int c;
|
|
|
744 const char *args = "p:s:h";
|
|
|
745 extern char *optarg;
|
|
|
746
|
|
|
747 // Process command line options
|
|
|
748 while ((c = getopt(argc, argv, args)) != -1) {
|
|
|
749 switch (c) {
|
|
|
750 case 'p':
|
|
|
751 if (optarg == NULL || *optarg == '\0') {
|
|
|
752 fprintf(stderr, "Illegal conn: %s\n", optarg);
|
|
|
753 exit(EX_USAGE);
|
|
|
754 }
|
|
|
755 if (smfi_setconn(optarg) == MI_FAILURE) {
|
|
|
756 fprintf(stderr, "smfi_setconn failed\n");
|
|
|
757 exit(EX_SOFTWARE);
|
|
|
758 }
|
|
|
759
|
|
|
760 if (strncasecmp(optarg, "unix:", 5) == 0) unlink(optarg + 5);
|
|
|
761 else if (strncasecmp(optarg, "local:", 6) == 0) unlink(optarg + 6);
|
|
|
762 setconn = TRUE;
|
|
|
763 break;
|
|
|
764
|
|
|
765 case 't':
|
|
|
766 if (optarg == NULL || *optarg == '\0') {
|
|
|
767 fprintf(stderr, "Illegal timeout: %s\n", optarg);
|
|
|
768 exit(EX_USAGE);
|
|
|
769 }
|
|
|
770 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) {
|
|
|
771 fprintf(stderr, "smfi_settimeout failed\n");
|
|
|
772 exit(EX_SOFTWARE);
|
|
|
773 }
|
|
|
774 break;
|
|
|
775
|
|
|
776 case 'h':
|
|
|
777 default:
|
|
|
778 usage(argv[0]);
|
|
|
779 exit(EX_USAGE);
|
|
|
780 }
|
|
|
781 }
|
|
|
782 if (!setconn) {
|
|
|
783 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]);
|
|
|
784 usage(argv[0]);
|
|
|
785 exit(EX_USAGE);
|
|
|
786 }
|
|
|
787 if (smfi_register(smfilter) == MI_FAILURE) {
|
|
|
788 fprintf(stderr, "smfi_register failed\n");
|
|
|
789 exit(EX_UNAVAILABLE);
|
|
|
790 }
|
|
|
791
|
|
|
792 // switch to background mode
|
|
|
793 if (daemon(1,0) < 0) {
|
|
|
794 fprintf(stderr, "daemon() call failed\n");
|
|
|
795 exit(EX_UNAVAILABLE);
|
|
|
796 }
|
|
|
797
|
|
|
798 // initialize the thread sync objects
|
|
|
799 pthread_mutex_init(&config_mutex, 0);
|
|
|
800 pthread_mutex_init(&syslog_mutex, 0);
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801 pthread_mutex_init(&resolve_mutex, 0);
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802
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803 // load the initial config
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804 config = new_conf();
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805
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806 // only create threads after the fork() in daemon
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807 pthread_t tid;
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808 if (pthread_create(&tid, 0, config_loader, 0))
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809 my_syslog("failed to create config loader thread");
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810 if (pthread_detach(tid))
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811 my_syslog("failed to detach config loader thread");
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812
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813 // write the pid
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814 const char *pidpath = "/var/run/dnsbl.pid";
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815 unlink(pidpath);
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816 FILE *f = fopen(pidpath, "w");
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817 if (f) {
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818 fprintf(f, "-%d\n", (u_int)getpgrp());
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819 fclose(f);
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820 }
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821
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822 int rc = smfi_main();
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823 }
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