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0
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1 /*
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2
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3 Copyright (c) 2004, 2005 Carl Byington - 510 Software Group, released
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4 under 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 -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 socket io
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27 #include <sys/ioctl.h>
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28 #include <net/if.h>
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29 #include <arpa/inet.h>
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30 #include <netinet/in.h>
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31 #include <netinet/tcp.h>
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32 #include <netdb.h>
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33 #include <sys/socket.h>
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34 #include <sys/un.h>
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35
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36 // needed for thread
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37 #include <pthread.h>
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38
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39 // needed for std c++ collections
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40 #include <set>
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41 #include <map>
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42 #include <list>
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43
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44 // for the dns resolver
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45 #include <netinet/in.h>
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46 #include <arpa/nameser.h>
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47 #include <resolv.h>
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48
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49 // misc stuff needed here
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50 #include <ctype.h>
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51 #include <syslog.h>
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52 #include <pwd.h>
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53 #include <sys/wait.h> /* header for waitpid() and various macros */
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54 #include <signal.h> /* header for signal functions */
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55
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56 #include "includes.h"
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57
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2
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58 static char* smarchive_version="$Id$";
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0
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59
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60
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61 extern "C" {
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62 #include "libmilter/mfapi.h"
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63 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr);
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64 sfsistat mlfi_envfrom(SMFICTX *ctx, char **argv);
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65 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **argv);
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66 sfsistat mlfi_eom(SMFICTX *ctx);
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67 sfsistat mlfi_abort(SMFICTX *ctx);
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68 sfsistat mlfi_close(SMFICTX *ctx);
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69 void sig_chld(int signo);
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70 }
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71
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72 int debug_syslog = 0;
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73 bool syslog_opened = false;
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74 bool use_syslog = true; // false to printf
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75 bool loader_run = true; // used to stop the config loader thread
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76 CONFIG *config = NULL; // protected by the config_mutex
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77 int generation = 0; // protected by the config_mutex
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78 const int maxlen = 1000; // used for snprintf buffers
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79
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80 pthread_mutex_t config_mutex;
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81 pthread_mutex_t syslog_mutex;
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82
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83
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84 mlfiPriv::mlfiPriv() {
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85 pthread_mutex_lock(&config_mutex);
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86 pc = config;
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87 pc->reference_count++;
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88 pthread_mutex_unlock(&config_mutex);
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8
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89 mailaddr = NULL;
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90 queueid = NULL;
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0
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91 }
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92
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93 mlfiPriv::~mlfiPriv() {
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94 pthread_mutex_lock(&config_mutex);
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95 pc->reference_count--;
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96 pthread_mutex_unlock(&config_mutex);
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97 reset(true);
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98 }
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99
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100 void mlfiPriv::reset(bool final) {
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8
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101 targets.clear();
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0
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102 if (mailaddr) free(mailaddr);
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103 if (queueid) free(queueid);
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104 if (!final) {
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105 mailaddr = NULL;
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106 queueid = NULL;
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107 }
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108 }
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109
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110 #define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx))
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111
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112
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113 ////////////////////////////////////////////////
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114 // syslog a message
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115 //
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116 void my_syslog(mlfiPriv *priv, char *text) {
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117 char buf[maxlen];
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118 if (priv) {
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119 snprintf(buf, sizeof(buf), "%s: %s", priv->queueid, text);
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120 text = buf;
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121 }
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122 if (use_syslog) {
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123 pthread_mutex_lock(&syslog_mutex);
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124 if (!syslog_opened) {
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2
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125 openlog("sm-archive", LOG_PID, LOG_MAIL);
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0
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126 syslog_opened = true;
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127 }
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128 syslog(LOG_NOTICE, "%s", text);
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129 pthread_mutex_unlock(&syslog_mutex);
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130 }
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131 else {
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132 printf("%s \n", text);
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133 }
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134 }
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135
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136 void my_syslog(char *text) {
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137 my_syslog(NULL, text);
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138 }
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139
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140
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141 ////////////////////////////////////////////////
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142 // this email address is passed in from sendmail, and will
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143 // always be enclosed in <>. It may have mixed case, just
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144 // as the mail client sent it. We dup the string and convert
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145 // the duplicate to lower case.
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146 //
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147 char *to_lower_string(char *email);
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148 char *to_lower_string(char *email) {
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149 int n = strlen(email)-2;
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150 if (n < 1) return strdup(email);
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151 char *key = strdup(email+1);
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152 key[n] = '\0';
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153 for (int i=0; i<n; i++) key[i] = tolower(key[i]);
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154 return key;
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155 }
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156
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157
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158 ////////////////////////////////////////////////
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159 // start of sendmail milter interfaces
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160 //
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161 sfsistat mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr)
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162 {
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163 // allocate some private memory
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164 mlfiPriv *priv = new mlfiPriv;
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165 // save the private data
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166 smfi_setpriv(ctx, (void*)priv);
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167 // continue processing
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168 return SMFIS_CONTINUE;
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169 }
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170
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171 sfsistat mlfi_envfrom(SMFICTX *ctx, char **from)
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172 {
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173 mlfiPriv &priv = *MLFIPRIV;
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174 priv.mailaddr = to_lower_string(from[0]);
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175 return SMFIS_CONTINUE;
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176 }
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177
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8
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178 void add_target(mlfiPriv &priv, char *target);
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179 void add_target(mlfiPriv &priv, char *target)
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7
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180 {
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181 if (target) {
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8
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182 string_set::iterator i = priv.targets.find(target);
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183 if (i == priv.targets.end()) priv.targets.insert(target);
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7
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184 }
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185 }
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186
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0
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187 sfsistat mlfi_envrcpt(SMFICTX *ctx, char **rcpt)
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188 {
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189 mlfiPriv &priv = *MLFIPRIV;
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190 CONFIG &dc = *priv.pc;
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191 if (!priv.queueid) priv.queueid = strdup(smfi_getsymval(ctx, "i"));
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192 char *rcptaddr = to_lower_string(rcpt[0]);
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193 if (debug_syslog > 1) {
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194 char msg[maxlen];
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195 snprintf(msg, sizeof(msg), "from <%s> to <%s>", priv.mailaddr, rcptaddr);
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196 my_syslog(&priv, msg);
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197 }
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198 char *target = dc.find_to(rcptaddr);
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199 free(rcptaddr);
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8
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200 add_target(priv, target);
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0
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201 return SMFIS_CONTINUE;
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202 }
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203
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204 sfsistat mlfi_eom(SMFICTX *ctx)
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205 {
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8
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206 mlfiPriv &priv = *MLFIPRIV;
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207 CONFIG &dc = *priv.pc;
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208 char *target = dc.find_from(priv.mailaddr);
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209 add_target(priv, target);
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210 for (string_set::iterator i=priv.targets.begin(); i!=priv.targets.end(); i++) {
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211 target = (*i);
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212 smfi_addrcpt(ctx, target);
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213 if (debug_syslog > 1) {
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214 char msg[maxlen];
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215 snprintf(msg, sizeof(msg), "adding recipient <%s>", target);
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216 my_syslog(&priv, msg);
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217 }
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218 }
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0
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219 // reset for a new message on the same connection
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220 mlfi_abort(ctx);
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221 return SMFIS_CONTINUE;
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222 }
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223
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224 sfsistat mlfi_abort(SMFICTX *ctx)
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225 {
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226 mlfiPriv &priv = *MLFIPRIV;
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227 priv.reset();
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228 return SMFIS_CONTINUE;
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229 }
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230
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231 sfsistat mlfi_close(SMFICTX *ctx)
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232 {
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233 mlfiPriv *priv = MLFIPRIV;
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234 if (!priv) return SMFIS_CONTINUE;
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235 delete priv;
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236 smfi_setpriv(ctx, NULL);
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237 return SMFIS_CONTINUE;
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238 }
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239
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240 struct smfiDesc smfilter =
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241 {
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242 "SM-ARCHIVE", // filter name
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243 SMFI_VERSION, // version code -- do not change
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244 SMFIF_ADDRCPT, // flags
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245 mlfi_connect, // connection info filter
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246 NULL, // SMTP HELO command filter
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247 mlfi_envfrom, // envelope sender filter
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248 mlfi_envrcpt, // envelope recipient filter
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249 NULL, // header filter
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250 NULL, // end of header
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251 NULL, // body block filter
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252 mlfi_eom, // end of message
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253 mlfi_abort, // message aborted
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254 mlfi_close, // connection cleanup
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255 };
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256
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257
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258 ////////////////////////////////////////////////
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259 // reload the config
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260 //
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261 CONFIG* new_conf();
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262 CONFIG* new_conf() {
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263 CONFIG *newc = new CONFIG;
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264 pthread_mutex_lock(&config_mutex);
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265 newc->generation = generation++;
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266 pthread_mutex_unlock(&config_mutex);
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267 if (debug_syslog) {
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268 char buf[maxlen];
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269 snprintf(buf, sizeof(buf), "loading configuration generation %d", newc->generation);
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270 my_syslog(buf);
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271 }
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2
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272 if (load_conf(*newc, "sm-archive.conf")) {
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0
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273 newc->load_time = time(NULL);
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274 return newc;
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275 }
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276 delete newc;
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277 return NULL;
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278 }
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279
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280
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281 ////////////////////////////////////////////////
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282 // thread to watch the old config files for changes
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283 // and reload when needed. we also cleanup old
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284 // configs whose reference count has gone to zero.
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285 //
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286 void* config_loader(void *arg);
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287 void* config_loader(void *arg) {
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288 typedef set<CONFIG *> configp_set;
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289 configp_set old_configs;
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290 while (loader_run) {
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291 sleep(180); // look for modifications every 3 minutes
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292 if (!loader_run) break;
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293 CONFIG &dc = *config;
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294 time_t then = dc.load_time;
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295 struct stat st;
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296 bool reload = false;
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297 for (string_set::iterator i=dc.config_files.begin(); i!=dc.config_files.end(); i++) {
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298 char *fn = *i;
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299 if (stat(fn, &st)) reload = true; // file disappeared
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300 else if (st.st_mtime > then) reload = true; // file modified
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301 if (reload) break;
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302 }
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303 if (reload) {
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304 CONFIG *newc = new_conf();
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305 if (newc) {
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306 // replace the global config pointer
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307 pthread_mutex_lock(&config_mutex);
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308 CONFIG *old = config;
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309 config = newc;
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310 pthread_mutex_unlock(&config_mutex);
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311 if (old) old_configs.insert(old);
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312 }
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313 else {
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314 // failed to load new config
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315 my_syslog("failed to load new configuration");
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2
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316 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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317 // update the load time on the current config to prevent complaining every 3 minutes
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318 dc.load_time = time(NULL);
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319 }
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320 }
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321 // now look for old configs with zero ref counts
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322 for (configp_set::iterator i=old_configs.begin(); i!=old_configs.end(); ) {
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323 CONFIG *old = *i;
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324 if (!old->reference_count) {
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325 if (debug_syslog) {
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326 char buf[maxlen];
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327 snprintf(buf, sizeof(buf), "freeing memory for old configuration generation %d", old->generation);
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328 my_syslog(buf);
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329 }
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330 delete old; // destructor does all the work
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331 old_configs.erase(i++);
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332 }
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333 else i++;
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334 }
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335 }
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336 return NULL;
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337 }
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338
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339
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340 void usage(char *prog);
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341 void usage(char *prog)
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342 {
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343 fprintf(stderr, "Usage: %s [-d [level]] [-c] -p sm-sock-addr [-t timeout]\n", prog);
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344 fprintf(stderr, "where sm-sock-addr is for the connection to sendmail\n");
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345 fprintf(stderr, " and should be one of\n");
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346 fprintf(stderr, " inet:port@ip-address\n");
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347 fprintf(stderr, " local:local-domain-socket-file-name\n");
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348 fprintf(stderr, "-c will load and dump the config to stdout\n");
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349 fprintf(stderr, "-d will set the syslog message level, currently 0 to 3\n");
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350 }
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351
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352
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353
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354 void setup_socket(char *sock);
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355 void setup_socket(char *sock) {
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356 unlink(sock);
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357 // sockaddr_un addr;
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358 // memset(&addr, '\0', sizeof addr);
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359 // addr.sun_family = AF_UNIX;
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360 // strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1);
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361 // int s = socket(AF_UNIX, SOCK_STREAM, 0);
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362 // bind(s, (sockaddr*)&addr, sizeof(addr));
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363 // close(s);
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364 }
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365
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366
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367 /*
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368 * The signal handler function -- only gets called when a SIGCHLD
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369 * is received, ie when a child terminates
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370 */
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371 void sig_chld(int signo)
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372 {
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373 int status;
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374 /* Wait for any child without blocking */
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375 while (waitpid(-1, &status, WNOHANG) > 0) {
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376 // ignore child exit status, we only do this to cleanup zombies
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377 }
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378 }
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379
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380
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381 int main(int argc, char**argv)
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382 {
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383 token_init();
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384 bool check = false;
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385 bool setconn = false;
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386 int c;
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387 const char *args = "p:t:d:ch";
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388 extern char *optarg;
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389
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390 // Process command line options
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391 while ((c = getopt(argc, argv, args)) != -1) {
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392 switch (c) {
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393 case 'p':
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394 if (optarg == NULL || *optarg == '\0') {
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395 fprintf(stderr, "Illegal sendmail socket: %s\n", optarg);
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396 exit(EX_USAGE);
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397 }
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398 if (smfi_setconn(optarg) == MI_FAILURE) {
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399 fprintf(stderr, "smfi_setconn failed\n");
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400 exit(EX_SOFTWARE);
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401 }
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402 if (strncasecmp(optarg, "unix:", 5) == 0) setup_socket(optarg + 5);
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403 else if (strncasecmp(optarg, "local:", 6) == 0) setup_socket(optarg + 6);
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404 setconn = true;
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405 break;
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406
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407 case 't':
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408 if (optarg == NULL || *optarg == '\0') {
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409 fprintf(stderr, "Illegal timeout: %s\n", optarg);
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410 exit(EX_USAGE);
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411 }
|
|
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412 if (smfi_settimeout(atoi(optarg)) == MI_FAILURE) {
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413 fprintf(stderr, "smfi_settimeout failed\n");
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414 exit(EX_SOFTWARE);
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|
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415 }
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|
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416 break;
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|
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417
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|
|
418 case 'c':
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|
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419 check = true;
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|
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420 break;
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|
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421
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|
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422 case 'd':
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423 if (optarg == NULL || *optarg == '\0') debug_syslog = 1;
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|
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424 else debug_syslog = atoi(optarg);
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|
|
425 break;
|
|
|
426
|
|
|
427 case 'h':
|
|
|
428 default:
|
|
|
429 usage(argv[0]);
|
|
|
430 exit(EX_USAGE);
|
|
|
431 }
|
|
|
432 }
|
|
|
433
|
|
|
434 if (check) {
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|
|
435 use_syslog = false;
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|
|
436 debug_syslog = 10;
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|
|
437 CONFIG *conf = new_conf();
|
|
|
438 if (conf) {
|
|
|
439 conf->dump();
|
|
|
440 delete conf;
|
|
|
441 return 0;
|
|
|
442 }
|
|
|
443 else {
|
|
|
444 return 1; // config failed to load
|
|
|
445 }
|
|
|
446 }
|
|
|
447
|
|
|
448 if (!setconn) {
|
|
|
449 fprintf(stderr, "%s: Missing required -p argument\n", argv[0]);
|
|
|
450 usage(argv[0]);
|
|
|
451 exit(EX_USAGE);
|
|
|
452 }
|
|
|
453
|
|
|
454 if (smfi_register(smfilter) == MI_FAILURE) {
|
|
|
455 fprintf(stderr, "smfi_register failed\n");
|
|
|
456 exit(EX_UNAVAILABLE);
|
|
|
457 }
|
|
|
458
|
|
|
459 // switch to background mode
|
|
|
460 if (daemon(1,0) < 0) {
|
|
|
461 fprintf(stderr, "daemon() call failed\n");
|
|
|
462 exit(EX_UNAVAILABLE);
|
|
|
463 }
|
|
|
464
|
|
|
465 // write the pid
|
|
2
|
466 const char *pidpath = "/var/run/sm-archive.pid";
|
|
0
|
467 unlink(pidpath);
|
|
|
468 FILE *f = fopen(pidpath, "w");
|
|
|
469 if (f) {
|
|
|
470 #ifdef linux
|
|
|
471 // from a comment in the DCC source code:
|
|
|
472 // Linux threads are broken. Signals given the
|
|
|
473 // original process are delivered to only the
|
|
|
474 // thread that happens to have that PID. The
|
|
|
475 // sendmail libmilter thread that needs to hear
|
|
|
476 // SIGINT and other signals does not, and that breaks
|
|
|
477 // scripts that need to stop milters.
|
|
|
478 // However, signaling the process group works.
|
|
|
479 fprintf(f, "-%d\n", (u_int)getpgrp());
|
|
|
480 #else
|
|
|
481 fprintf(f, "%d\n", (u_int)getpid());
|
|
|
482 #endif
|
|
|
483 fclose(f);
|
|
|
484 }
|
|
|
485
|
|
|
486 // initialize the thread sync objects
|
|
|
487 pthread_mutex_init(&config_mutex, 0);
|
|
|
488 pthread_mutex_init(&syslog_mutex, 0);
|
|
|
489
|
|
|
490 // drop root privs
|
|
|
491 struct passwd *pw = getpwnam("sm-archive");
|
|
|
492 if (pw) {
|
|
|
493 if (setgid(pw->pw_gid) == -1) {
|
|
2
|
494 my_syslog("failed to switch to group sm-archive");
|
|
0
|
495 }
|
|
|
496 if (setuid(pw->pw_uid) == -1) {
|
|
2
|
497 my_syslog("failed to switch to user sm-archive");
|
|
0
|
498 }
|
|
|
499 }
|
|
|
500
|
|
|
501 // load the initial config
|
|
|
502 config = new_conf();
|
|
|
503 if (!config) {
|
|
|
504 my_syslog("failed to load initial configuration, quitting");
|
|
|
505 exit(1);
|
|
|
506 }
|
|
|
507
|
|
|
508 // only create threads after the fork() in daemon
|
|
|
509 pthread_t tid;
|
|
|
510 if (pthread_create(&tid, 0, config_loader, 0))
|
|
|
511 my_syslog("failed to create config loader thread");
|
|
|
512 if (pthread_detach(tid))
|
|
|
513 my_syslog("failed to detach config loader thread");
|
|
|
514
|
|
|
515 time_t starting = time(NULL);
|
|
|
516 int rc = smfi_main();
|
|
|
517 if ((rc != MI_SUCCESS) && (time(NULL) > starting+5*60)) {
|
|
|
518 my_syslog("trying to restart after smfi_main()");
|
|
|
519 loader_run = false; // eventually the config loader thread will terminate
|
|
|
520 execvp(argv[0], argv);
|
|
|
521 }
|
|
|
522 exit((rc == MI_SUCCESS) ? 0 : EX_UNAVAILABLE);
|
|
|
523 }
|
|
|
524
|
