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