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0
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1 /*
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2
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13
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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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0
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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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13
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8 suppliers.
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0
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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 -c Check the config, and print a copy to stdout. Don't start the
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13 milter or do anything with the socket.
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14 -d increase debug level
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15
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16 */
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17
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18
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19 // from sendmail sample
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20 #include <sys/types.h>
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21 #include <sys/stat.h>
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22 #include <errno.h>
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23 #include <sysexits.h>
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24 #include <unistd.h>
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25
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26 // needed for thread
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27 #include <pthread.h>
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28
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29 // needed for std c++ collections
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30 #include <set>
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31 #include <map>
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32 #include <list>
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33
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34 // misc stuff needed here
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35 #include <ctype.h>
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36 #include <syslog.h>
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37 #include <pwd.h>
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38 #include <sys/wait.h> /* header for waitpid() and various macros */
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39 #include <signal.h> /* header for signal functions */
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40
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41 #include "includes.h"
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42
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9
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43 #ifndef HAVE_DAEMON
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44 #include "daemon.h"
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45 #include "daemon.c"
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46 #endif
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47
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10
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48 static const char* smarchive_version="$Id$";
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0
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49
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50
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51 extern "C" {
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9
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52 #include <libmilter/mfapi.h>
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0
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53 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr);
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54 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv);
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55 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv);
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56 sfsistat mlfi_eom(SMFICTX *ctx);
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57 sfsistat mlfi_abort(SMFICTX *ctx);
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58 sfsistat mlfi_close(SMFICTX *ctx);
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59 void sig_chld(int signo);
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60 }
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61
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62 int debug_syslog = 0;
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63 bool syslog_opened = false;
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64 bool use_syslog = true; // false to printf
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65 bool loader_run = true; // used to stop the config loader thread
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66 CONFIG *config = NULL; // protected by the config_mutex
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67 int generation = 0; // protected by the config_mutex
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68 const int maxlen = 1000; // used for snprintf buffers
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69
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70 pthread_mutex_t config_mutex;
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71 pthread_mutex_t syslog_mutex;
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72
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73
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74 mlfiPriv::mlfiPriv() {
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75 pthread_mutex_lock(&config_mutex);
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76 pc = config;
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77 pc->reference_count++;
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78 pthread_mutex_unlock(&config_mutex);
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8
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79 mailaddr = NULL;
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80 queueid = NULL;
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0
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81 }
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82
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83 mlfiPriv::~mlfiPriv() {
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84 pthread_mutex_lock(&config_mutex);
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85 pc->reference_count--;
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86 pthread_mutex_unlock(&config_mutex);
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87 reset(true);
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88 }
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89
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90 void mlfiPriv::reset(bool final) {
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8
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91 targets.clear();
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13
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92 for (string_set::iterator i=removal.begin(); i!=removal.end(); i++) {
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93 char *remove = (*i);
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94 free(remove);
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95 }
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96 removal.clear();
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0
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97 if (mailaddr) free(mailaddr);
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98 if (queueid) free(queueid);
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99 if (!final) {
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100 mailaddr = NULL;
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101 queueid = NULL;
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102 }
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103 }
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104
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105 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx))
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106
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107
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108 ////////////////////////////////////////////////
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109 // syslog a message
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110 //
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111 void my_syslog(mlfiPriv *priv, char *text) {
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112 char buf[maxlen];
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113 if (priv) {
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114 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text);
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115 text = buf;
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116 }
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117 if (use_syslog) {
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118 pthread_mutex_lock(&syslog_mutex);
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119 if (!syslog_opened) {
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2
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120 openlog("sm-archive", LOG_PID, LOG_MAIL);
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0
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121 syslog_opened = true;
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122 }
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123 syslog(LOG_NOTICE, "%s", text);
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124 pthread_mutex_unlock(&syslog_mutex);
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125 }
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126 else {
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127 printf("%s \n", text);
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128 }
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129 }
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130
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131 void my_syslog(char *text) {
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132 my_syslog(NULL, text);
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133 }
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134
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135
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136 ////////////////////////////////////////////////
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137 // this email address is passed in from sendmail, and will
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138 // always be enclosed in <>. It may have mixed case, just
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139 // as the mail client sent it. We dup the string and convert
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140 // the duplicate to lower case.
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141 //
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142 char *to_lower_string(char *email);
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143 char *to_lower_string(char *email) {
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144 int n = strlen(email)-2;
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145 if (n < 1) return strdup(email);
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146 char *key = strdup(email+1);
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147 key[n] = '\0';
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148 for (int i=0; i<n; i++) key[i] = tolower(key[i]);
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149 return key;
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150 }
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151
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152
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153 ////////////////////////////////////////////////
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154 // start of sendmail milter interfaces
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155 //
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156 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr)
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157 {
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158 // allocate some private memory
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159 mlfiPriv *priv = new mlfiPriv;
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160 // save the private data
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161 smfi_setpriv(ctx, (void*)priv);
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162 // continue processing
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163 return SMFIS_CONTINUE;
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164 }
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165
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166 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from)
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167 {
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168 mlfiPriv &priv = *MLFIPRIV;
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169 priv.mailaddr = to_lower_string(from[0]);
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170 return SMFIS_CONTINUE;
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171 }
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172
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8
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173 void add_target(mlfiPriv &priv, char *target);
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174 void add_target(mlfiPriv &priv, char *target)
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7
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175 {
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176 if (target) {
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8
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177 string_set::iterator i = priv.targets.find(target);
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178 if (i == priv.targets.end()) priv.targets.insert(target);
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7
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179 }
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180 }
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181
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13
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182 void add_remove(mlfiPriv &priv, char *remove);
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183 void add_remove(mlfiPriv &priv, char *remove)
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184 {
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185 if (remove) {
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186 string_set::iterator i = priv.removal.find(remove);
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187 if (i == priv.removal.end()) priv.removal.insert(remove);
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188 }
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189 }
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190
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0
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191 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt)
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192 {
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193 mlfiPriv &priv = *MLFIPRIV;
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194 CONFIG &dc = *priv.pc;
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195 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i"));
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196 char *rcptaddr = to_lower_string(rcpt[0]);
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197 if (debug_syslog > 1) {
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198 char msg[maxlen];
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199 snprintf(msg, sizeof(msg), "from <%s> to <%s>", priv.mailaddr, rcptaddr);
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200 my_syslog(&priv, msg);
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201 }
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202 char *target = dc.find_to(rcptaddr);
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13
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203 add_target(priv, target);
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204 bool remove = dc.find_remove(rcptaddr);
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205 if (remove) add_remove(priv, strdup(rcptaddr));
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0
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206 free(rcptaddr);
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207 return SMFIS_CONTINUE;
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208 }
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209
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210 sfsistat mlfi_eom(SMFICTX *ctx)
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211 {
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8
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212 mlfiPriv &priv = *MLFIPRIV;
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213 CONFIG &dc = *priv.pc;
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214 char *target = dc.find_from(priv.mailaddr);
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215 add_target(priv, target);
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216 for (string_set::iterator i=priv.targets.begin(); i!=priv.targets.end(); i++) {
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217 target = (*i);
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218 smfi_addrcpt(ctx, target);
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219 if (debug_syslog > 1) {
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220 char msg[maxlen];
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221 snprintf(msg, sizeof(msg), "adding recipient <%s>", target);
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222 my_syslog(&priv, msg);
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223 }
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224 }
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13
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225 for (string_set::iterator i=priv.removal.begin(); i!=priv.removal.end(); i++) {
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226 char *remove = (*i);
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227 smfi_delrcpt(ctx, remove);
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228 if (debug_syslog > 1) {
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229 char msg[maxlen];
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230 snprintf(msg, sizeof(msg), "removing recipient <%s>", remove);
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231 my_syslog(&priv, msg);
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232 }
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233 }
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0
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234 // reset for a new message on the same connection
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235 mlfi_abort(ctx);
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236 return SMFIS_CONTINUE;
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237 }
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238
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239 sfsistat mlfi_abort(SMFICTX *ctx)
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240 {
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241 mlfiPriv &priv = *MLFIPRIV;
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242 priv.reset();
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243 return SMFIS_CONTINUE;
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244 }
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245
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246 sfsistat mlfi_close(SMFICTX *ctx)
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247 {
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248 mlfiPriv *priv = MLFIPRIV;
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249 if (!priv) return SMFIS_CONTINUE;
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250 delete priv;
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251 smfi_setpriv(ctx, NULL);
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252 return SMFIS_CONTINUE;
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253 }
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254
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255 struct smfiDesc smfilter =
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256 {
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257 "SM-ARCHIVE", // filter name
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258 SMFI_VERSION, // version code -- do not change
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13
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259 SMFIF_ADDRCPT | \
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260 SMFIF_DELRCPT, // flags
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0
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261 mlfi_connect, // connection info filter
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262 NULL, // SMTP HELO command filter
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263 mlfi_envfrom, // envelope sender filter
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264 mlfi_envrcpt, // envelope recipient filter
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265 NULL, // header filter
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266 NULL, // end of header
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267 NULL, // body block filter
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268 mlfi_eom, // end of message
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269 mlfi_abort, // message aborted
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270 mlfi_close, // connection cleanup
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271 };
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272
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273
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274 ////////////////////////////////////////////////
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275 // reload the config
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276 //
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277 CONFIG* new_conf();
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278 CONFIG* new_conf() {
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279 CONFIG *newc = new CONFIG;
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280 pthread_mutex_lock(&config_mutex);
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281 newc->generation = generation++;
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282 pthread_mutex_unlock(&config_mutex);
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283 if (debug_syslog) {
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284 char buf[maxlen];
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285 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation);
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286 my_syslog(buf);
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287 }
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2
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288 if (load_conf(*newc, "sm-archive.conf")) {
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0
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289 newc->load_time = time(NULL);
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290 return newc;
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291 }
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292 delete newc;
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293 return NULL;
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294 }
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295
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296
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297 ////////////////////////////////////////////////
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298 // thread to watch the old config files for changes
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299 // and reload when needed. we also cleanup old
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300 // configs whose reference count has gone to zero.
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301 //
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10
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302 extern "C" {void* config_loader(void *arg);}
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0
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303 void* config_loader(void *arg) {
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304 while (loader_run) {
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305 sleep(180); // look for modifications every 3 minutes
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306 if (!loader_run) break;
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307 CONFIG &dc = *config;
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308 time_t then = dc.load_time;
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309 struct stat st;
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310 bool reload = false;
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311 for (string_set::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) {
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312 char *fn = *i;
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313 if (stat(fn, &st)) reload = true; // file disappeared
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314 else if (st.st_mtime > then) reload = true; // file modified
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315 if (reload) break;
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316 }
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317 if (reload) {
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318 CONFIG *newc = new_conf();
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319 if (newc) {
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320 // replace the global config pointer
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321 pthread_mutex_lock(&config_mutex);
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322 CONFIG *old = config;
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13
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323 bool last = old && (!old->reference_count);
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0
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324 config = newc;
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325 pthread_mutex_unlock(&config_mutex);
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13
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326 if (last) delete old; // there were no references to this config
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0
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327 }
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328 else {
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329 // failed to load new config
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330 my_syslog("failed to load new configuration");
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2
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331 system("echo 'failed to load new sm-archive configuration from /etc/sm-archive' | mail -s 'error in /etc/sm-archive configuration' root");
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0
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332 // update the load time on the current config to prevent complaining every 3 minutes
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333 dc.load_time = time(NULL);
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334 }
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335 }
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336 }
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337 return NULL;
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338 }
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339
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340
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341 void usage(char *prog);
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342 void usage(char *prog)
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343 {
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344 fprintf(stderr, "Usage: %s [-d [level]] [-c] -p sm-sock-addr [-t timeout]\n", prog);
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345 fprintf(stderr, "where sm-sock-addr is for the connection to sendmail\n");
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346 fprintf(stderr, " and should be one of\n");
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347 fprintf(stderr, " inet:port@ip-address\n");
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348 fprintf(stderr, " local:local-domain-socket-file-name\n");
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349 fprintf(stderr, "-c will load and dump the config to stdout\n");
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350 fprintf(stderr, "-d will set the syslog message level, currently 0 to 3\n");
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351 }
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352
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353
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354
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355 void setup_socket(char *sock);
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356 void setup_socket(char *sock) {
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357 unlink(sock);
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358 // sockaddr_un addr;
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359 // memset(&addr, '\0', sizeof addr);
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360 // addr.sun_family = AF_UNIX;
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361 // strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1);
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362 // int s = socket(AF_UNIX, SOCK_STREAM, 0);
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363 // bind(s, (sockaddr*)&addr, sizeof(addr));
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364 // close(s);
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365 }
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366
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367
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368 /*
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369 * The signal handler function -- only gets called when a SIGCHLD
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370 * is received, ie when a child terminates
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371 */
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372 void sig_chld(int signo)
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373 {
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374 int status;
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375 /* Wait for any child without blocking */
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376 while (waitpid(-1, &status, WNOHANG) > 0) {
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377 // ignore child exit status, we only do this to cleanup zombies
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378 }
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379 }
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380
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381
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382 int main(int argc, char**argv)
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383 {
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384 token_init();
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385 bool check = false;
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386 bool setconn = false;
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387 int c;
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388 const char *args = "p:t:d:ch";
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389 extern char *optarg;
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390
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391 // Process command line options
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392 while ((c = getopt(argc, argv, args)) != -1) {
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393 switch (c) {
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394 case 'p':
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395 if (optarg == NULL || *optarg == '\0') {
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396 fprintf(stderr, "Illegal sendmail socket: %s\n", optarg);
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397 exit(EX_USAGE);
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398 }
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399 if (smfi_setconn(optarg) == MI_FAILURE) {
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400 fprintf(stderr, "smfi_setconn failed\n");
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401 exit(EX_SOFTWARE);
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402 }
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403 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5);
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404 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6);
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405 setconn = true;
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406 break;
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|
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407
|
|
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408 case 't':
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|
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409 if (optarg == NULL || *optarg == '\0') {
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|
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410 fprintf(stderr, "Illegal timeout: %s\n", optarg);
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411 exit(EX_USAGE);
|
|
|
412 }
|
|
|
413 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) {
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|
|
414 fprintf(stderr, "smfi_settimeout failed\n");
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|
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415 exit(EX_SOFTWARE);
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|
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416 }
|
|
|
417 break;
|
|
|
418
|
|
|
419 case 'c':
|
|
|
420 check = true;
|
|
|
421 break;
|
|
|
422
|
|
|
423 case 'd':
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|
|
424 if (optarg == NULL || *optarg == '\0') debug_syslog = 1;
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|
|
425 else debug_syslog = atoi(optarg);
|
|
|
426 break;
|
|
|
427
|
|
|
428 case 'h':
|
|
|
429 default:
|
|
|
430 usage(argv[0]);
|
|
|
431 exit(EX_USAGE);
|
|
|
432 }
|
|
|
433 }
|
|
|
434
|
|
|
435 if (check) {
|
|
|
436 use_syslog = false;
|
|
|
437 debug_syslog = 10;
|
|
|
438 CONFIG *conf = new_conf();
|
|
|
439 if (conf) {
|
|
|
440 conf->dump();
|
|
|
441 delete conf;
|
|
13
|
442 clear_strings(); // for valgrind checking
|
|
0
|
443 return 0;
|
|
|
444 }
|
|
|
445 else {
|
|
|
446 return 1; // config failed to load
|
|
|
447 }
|
|
|
448 }
|
|
|
449
|
|
|
450 if (!setconn) {
|
|
|
451 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]);
|
|
|
452 usage(argv[0]);
|
|
|
453 exit(EX_USAGE);
|
|
|
454 }
|
|
|
455
|
|
|
456 if (smfi_register(smfilter) == MI_FAILURE) {
|
|
|
457 fprintf(stderr, "smfi_register failed\n");
|
|
|
458 exit(EX_UNAVAILABLE);
|
|
|
459 }
|
|
|
460
|
|
|
461 // switch to background mode
|
|
|
462 if (daemon(1,0) < 0) {
|
|
|
463 fprintf(stderr, "daemon() call failed\n");
|
|
|
464 exit(EX_UNAVAILABLE);
|
|
|
465 }
|
|
|
466
|
|
|
467 // write the pid
|
|
2
|
468 const char *pidpath = "/var/run/sm-archive.pid";
|
|
0
|
469 unlink(pidpath);
|
|
|
470 FILE *f = fopen(pidpath, "w");
|
|
|
471 if (f) {
|
|
|
472 #ifdef linux
|
|
|
473 // from a comment in the DCC source code:
|
|
|
474 // Linux threads are broken. Signals given the
|
|
|
475 // original process are delivered to only the
|
|
|
476 // thread that happens to have that PID. The
|
|
|
477 // sendmail libmilter thread that needs to hear
|
|
|
478 // SIGINT and other signals does not, and that breaks
|
|
|
479 // scripts that need to stop milters.
|
|
|
480 // However, signaling the process group works.
|
|
|
481 fprintf(f, "-%d\n", (u_int)getpgrp());
|
|
|
482 #else
|
|
|
483 fprintf(f, "%d\n", (u_int)getpid());
|
|
|
484 #endif
|
|
|
485 fclose(f);
|
|
|
486 }
|
|
|
487
|
|
|
488 // initialize the thread sync objects
|
|
|
489 pthread_mutex_init(&config_mutex, 0);
|
|
|
490 pthread_mutex_init(&syslog_mutex, 0);
|
|
|
491
|
|
|
492 // drop root privs
|
|
|
493 struct passwd *pw = getpwnam("sm-archive");
|
|
|
494 if (pw) {
|
|
|
495 if (setgid(pw->pw_gid) == -1) {
|
|
2
|
496 my_syslog("failed to switch to group sm-archive");
|
|
0
|
497 }
|
|
|
498 if (setuid(pw->pw_uid) == -1) {
|
|
2
|
499 my_syslog("failed to switch to user sm-archive");
|
|
0
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 // load the initial config
|
|
|
504 config = new_conf();
|
|
|
505 if (!config) {
|
|
|
506 my_syslog("failed to load initial configuration, quitting");
|
|
|
507 exit(1);
|
|
|
508 }
|
|
|
509
|
|
|
510 // only create threads after the fork() in daemon
|
|
|
511 pthread_t tid;
|
|
|
512 if (pthread_create(&tid, 0, config_loader, 0))
|
|
|
513 my_syslog("failed to create config loader thread");
|
|
|
514 if (pthread_detach(tid))
|
|
|
515 my_syslog("failed to detach config loader thread");
|
|
|
516
|
|
|
517 time_t starting = time(NULL);
|
|
|
518 int rc = smfi_main();
|
|
|
519 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) {
|
|
|
520 my_syslog("trying to restart after smfi_main()");
|
|
|
521 loader_run = false; // eventually the config loader thread will terminate
|
|
|
522 execvp(argv[0], argv);
|
|
|
523 }
|
|
|
524 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE);
|
|
|
525 }
|
|
|
526
|
