1 | /// ----------------------------------------*- mode: C++; -*-- |
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2 | /// @file threadsafe_db.cpp |
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3 | /// Thread-safe access for some resolving functions (netdb)... |
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4 | /// ---------------------------------------------------------- |
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5 | /// $Id: threadsafe_db.cpp 2872 2008-02-18 10:58:03Z bless $ |
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6 | /// $HeadURL: https://svn.ipv6.tm.uka.de/nsis/protlib/trunk/src/threadsafe_db.cpp $ |
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7 | // =========================================================== |
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8 | // |
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9 | // Copyright (C) 2005-2007, all rights reserved by |
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10 | // - Institute of Telematics, Universitaet Karlsruhe (TH) |
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11 | // |
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12 | // More information and contact: |
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13 | // https://projekte.tm.uka.de/trac/NSIS |
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14 | // |
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15 | // This program is free software; you can redistribute it and/or modify |
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16 | // it under the terms of the GNU General Public License as published by |
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17 | // the Free Software Foundation; version 2 of the License |
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18 | // |
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19 | // This program is distributed in the hope that it will be useful, |
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20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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22 | // GNU General Public License for more details. |
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23 | // |
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24 | // You should have received a copy of the GNU General Public License along |
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25 | // with this program; if not, write to the Free Software Foundation, Inc., |
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26 | // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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27 | // |
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28 | // =========================================================== |
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29 | /** @ingroup netdb |
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30 | * |
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31 | * As the reentrant functions for netdb access seem not portable, I decided to |
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32 | * write some wrappers for those functions I need. This is not |
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33 | * object-oriented because the NetDB would be another singleton object and |
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34 | * I only want some wrapper functions. |
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35 | */ |
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36 | |
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37 | #include <netdb.h> |
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38 | #include <pwd.h> |
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39 | #include <netinet/in.h> |
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40 | #include <cerrno> |
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41 | |
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42 | #include "threadsafe_db.h" |
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43 | #include "cleanuphandler.h" |
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44 | #include "logfile.h" |
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45 | |
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46 | namespace protlib { |
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47 | |
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48 | /** @addtogroup netdb Thread-safe DB |
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49 | * @{ |
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50 | */ |
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51 | |
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52 | using namespace log; |
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53 | |
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54 | bool tsdb::is_init = false; |
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55 | bool tsdb::resolvenames = true; |
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56 | pthread_mutex_t tsdb::mutex = |
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57 | #ifdef _DEBUG |
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58 | PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP; |
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59 | #else |
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60 | PTHREAD_MUTEX_INITIALIZER; |
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61 | #endif |
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62 | |
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63 | |
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64 | uint32 tsdb::id32 = 1; |
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65 | uint64 tsdb::id64 = 1; |
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66 | |
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67 | protocol_t tsdb::udp_id= 17; |
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68 | protocol_t tsdb::tcp_id= 6; |
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69 | protocol_t tsdb::sctp_id= 132; |
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70 | |
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71 | |
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72 | void |
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73 | tsdb::init(bool noresolving) |
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74 | { |
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75 | if (is_init) |
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76 | { |
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77 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to initialize tstdb although already initialized."); |
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78 | } else |
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79 | { |
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80 | pthread_mutex_init(&mutex,NULL); |
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81 | is_init = true; |
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82 | |
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83 | // initialize frequently used protocol constants |
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84 | udp_id= tsdb::getprotobyname("udp"); |
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85 | tcp_id= tsdb::getprotobyname("tcp"); |
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86 | sctp_id= tsdb::getprotobyname("sctp"); |
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87 | |
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88 | resolvenames=!noresolving; |
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89 | if (!resolvenames) |
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90 | Log(INFO_LOG,LOG_NORMAL,"Threadsafe_DB"," ** Disabled reverse name lookups - addresses will not be resolved to names **"); |
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91 | } // end if is_init |
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92 | } // end init |
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93 | |
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94 | void tsdb::end() { |
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95 | if (is_init) { |
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96 | is_init = false; |
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97 | pthread_mutex_destroy(&mutex); |
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98 | } else { |
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99 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to end tstdb although not initialized."); |
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100 | } // end if is_init |
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101 | } // end end |
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102 | |
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103 | uint32 tsdb::get_new_id32() { |
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104 | uint32 res = 0; |
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105 | if (is_init) { |
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106 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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107 | res = id32++; |
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108 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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109 | } else { |
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110 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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111 | } // end if is_init |
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112 | return res; |
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113 | } // end get_new_id32 |
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114 | |
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115 | uint64 tsdb::get_new_id64() { |
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116 | uint64 res = 0; |
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117 | if (is_init) { |
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118 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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119 | res = id64++; |
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120 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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121 | } else { |
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122 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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123 | } // end if is_init |
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124 | return res; |
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125 | } // end get_new_id64 |
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126 | |
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127 | string tsdb::getprotobynumber(protocol_t proto, bool *res) { |
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128 | string str; |
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129 | if (is_init) |
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130 | { |
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131 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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132 | struct protoent* entry = ::getprotobynumber(proto); |
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133 | |
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134 | if (res) *res = (entry!=NULL); |
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135 | if (entry) |
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136 | str = entry->p_name; |
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137 | else |
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138 | str = "UNKNOWN"; |
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139 | |
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140 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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141 | } |
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142 | else |
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143 | { |
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144 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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145 | if (res) *res = false; |
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146 | str = ""; |
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147 | } // end if is_init |
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148 | return str; |
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149 | } // end getprotobynumber |
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150 | |
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151 | protocol_t tsdb::getprotobyname(const string &pname, bool *res) { |
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152 | return getprotobyname(pname.c_str(),res); |
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153 | } // end getprotobyname |
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154 | |
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155 | protocol_t tsdb::getprotobyname(const char* pname, bool *res) { |
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156 | register protocol_t pnum; |
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157 | struct protoent* entry = NULL; |
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158 | if (is_init) { |
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159 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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160 | if (pname) entry = ::getprotobyname(pname); |
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161 | if (res) *res = (entry!=NULL); |
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162 | if (entry) pnum = entry->p_proto; |
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163 | else pnum = 0; |
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164 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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165 | } else { |
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166 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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167 | if (res) *res = false; |
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168 | pnum = 0; |
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169 | } // end if is_init |
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170 | return pnum; |
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171 | } // end getprotobyname |
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172 | |
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173 | string tsdb::get_username(uid_t uid, bool *res) { |
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174 | string str; |
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175 | if (is_init) { |
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176 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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177 | struct passwd* entry = ::getpwuid(uid); |
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178 | if (res) *res = (entry!=NULL); |
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179 | if (entry) str = entry->pw_name; |
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180 | else str = "UNKNOWN"; |
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181 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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182 | } else { |
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183 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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184 | if (res) *res = false; |
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185 | str = ""; |
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186 | } // end if is_init |
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187 | return str; |
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188 | } // end get_username |
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189 | |
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190 | uid_t tsdb::get_userid(const char* uname, bool *res) { |
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191 | register uid_t uid; |
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192 | struct passwd* entry = NULL; |
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193 | if (is_init) { |
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194 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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195 | if (uname) entry = ::getpwnam(uname); |
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196 | if (res) *res = (entry!=NULL); |
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197 | if (entry) uid = entry->pw_uid; |
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198 | else uid = 0; |
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199 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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200 | } else { |
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201 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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202 | if (res) *res = false; |
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203 | uid = 0; |
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204 | } // end if is_init |
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205 | return uid; |
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206 | } // end get_userid |
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207 | |
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208 | uid_t tsdb::get_userid(const string& uname, bool *res) { |
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209 | return get_userid(uname.c_str(),res); |
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210 | } // end get_userid |
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211 | |
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212 | string tsdb::get_portname(port_t port, protocol_t prot, bool *res) { |
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213 | string str; |
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214 | if (is_init) { |
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215 | bool tmpres = true; |
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216 | string pname = getprotobynumber(prot,&tmpres); |
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217 | if (tmpres) { |
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218 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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219 | struct servent* entry = ::getservbyport(htons(port),pname.c_str()); |
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220 | if (res) *res = (entry!=NULL); |
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221 | if (entry) str = entry->s_name; |
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222 | else str = "UNKNOWN"; |
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223 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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224 | } else { |
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225 | if (res) *res = false; |
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226 | str = "UNKNOWN"; |
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227 | } // end if tmpres |
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228 | } else { |
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229 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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230 | if (res) *res = false; |
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231 | str = ""; |
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232 | } // end if is_init |
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233 | return str; |
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234 | } // end get_portname |
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235 | |
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236 | port_t tsdb::get_portnumber(const char* pname, protocol_t prot, bool *res) { |
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237 | register port_t pnum; |
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238 | struct servent* entry = NULL; |
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239 | if (is_init) { |
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240 | bool tmpres = true; |
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241 | string protoname = getprotobynumber(prot,&tmpres); |
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242 | if (tmpres) { |
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243 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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244 | if (pname) entry = ::getservbyname(pname,protoname.c_str()); |
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245 | if (res) *res = (entry!=NULL); |
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246 | if (entry) pnum = ntohs(entry->s_port); |
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247 | else pnum = 0; |
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248 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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249 | } else { |
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250 | if (res) *res = false; |
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251 | pnum = 0; |
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252 | } // end if tmpres |
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253 | } else { |
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254 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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255 | if (res) *res = false; |
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256 | pnum = 0; |
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257 | } // end if is_init |
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258 | return pnum; |
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259 | } // end get_portnumber |
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260 | |
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261 | port_t tsdb::get_portnumber(const string& pname, protocol_t prot, bool *res) { |
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262 | return get_portnumber(pname.c_str(),prot,res); |
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263 | } // end get_portnumber |
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264 | |
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265 | |
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266 | string |
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267 | tsdb::get_hostname(const struct sockaddr* sa, bool *res) |
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268 | { |
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269 | string str; |
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270 | static char tmpbuf[NI_MAXHOST]; |
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271 | |
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272 | if (is_init) |
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273 | { |
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274 | pthread_mutex_lock(&mutex); // install_cleanup_mutex_lock(&mutex); |
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275 | if (resolvenames) |
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276 | { |
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277 | int resultval= getnameinfo(sa,sizeof(struct sockaddr), |
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278 | tmpbuf,sizeof(tmpbuf), |
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279 | 0,0, // services |
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280 | 0); // flags |
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281 | |
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282 | if (res) *res = (resultval==0); |
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283 | if (resultval==0) |
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284 | { // success |
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285 | str= tmpbuf; // this should copy the buffer contents |
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286 | } |
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287 | else |
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288 | { |
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289 | str = "UNKNOWN"; |
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290 | if (resultval==EAI_AGAIN || errno==EAI_AGAIN) |
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291 | { |
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292 | Log(INFO_LOG,LOG_NORMAL, "Threadsafe_DB", "Temporary failure in name lookup. Try again later."); |
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293 | } |
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294 | else |
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295 | Log(INFO_LOG,LOG_NORMAL, "Threadsafe_DB", "Name lookup failed -" << strerror(errno)); |
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296 | |
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297 | if (res) *res= false; |
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298 | } |
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299 | } |
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300 | else |
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301 | { |
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302 | str= "disabled"; |
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303 | if (res) *res= false; |
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304 | } |
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305 | pthread_mutex_unlock(&mutex); // uninstall_cleanup(1); |
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306 | } |
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307 | else |
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308 | { |
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309 | Log(ERROR_LOG,LOG_NORMAL, "Threadsafe_DB", "Tried to access tsdb although not initialized."); |
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310 | if (res) *res = false; |
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311 | str = ""; |
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312 | } // end if is_init |
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313 | return str; |
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314 | } // ent get_hostname(in_addr) |
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315 | |
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316 | |
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317 | |
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318 | /** lookup of hostname for an ipv4 address |
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319 | * @param in ipv4 address structure |
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320 | * @param res returns true if name lookup was successful, otherwise false |
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321 | * |
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322 | * @return in case that resolving is enabled it returns the host name corresponding to the given address or "UNKNOWN", |
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323 | * otherwise it returns "disabled" |
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324 | */ |
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325 | string |
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326 | tsdb::get_hostname(const in_addr& in, bool *res) |
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327 | { |
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328 | struct sockaddr_in sa={ |
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329 | AF_INET, |
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330 | 0, |
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331 | in |
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332 | }; |
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333 | return get_hostname(reinterpret_cast<const sockaddr*>(&sa),res); |
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334 | } |
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335 | |
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336 | /** lookup of hostname for ipv6 address |
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337 | * @param in ipv6 address structure |
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338 | * @param res returns true if name lookup was successful, otherwise false |
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339 | * |
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340 | * @return in case that resolving is enabled it returns the host name corresponding to the given address or "UNKNOWN", |
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341 | * otherwise it returns "disabled" |
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342 | */ |
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343 | string |
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344 | tsdb::get_hostname(const in6_addr& in, bool *res) |
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345 | { |
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346 | struct sockaddr_in6 sa={ |
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347 | AF_INET6, |
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348 | 0, // transport layer port # |
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349 | 0, // IPv6 flow information |
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350 | in, |
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351 | 0 // scope id (new in RFC2553) |
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352 | }; |
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353 | return get_hostname(reinterpret_cast<const sockaddr*>(&sa),res); |
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354 | } // ent get_hostname(in6_addr) |
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355 | |
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356 | //@} |
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357 | |
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358 | } // end namespace protlib |
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