| 1 | // CheckEventLog.cpp : Defines the entry point for the DLL application. |
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| 2 | // |
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| 3 | |
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| 4 | #include "stdafx.h" |
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| 5 | #include "NRPEListener.h" |
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| 6 | #include <strEx.h> |
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| 7 | #include <time.h> |
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| 8 | #include <config.h> |
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| 9 | #include "NRPEPacket.h" |
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| 10 | |
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| 11 | NRPEListener gNRPEListener; |
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| 12 | |
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| 13 | BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) |
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| 14 | { |
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| 15 | NSCModuleWrapper::wrapDllMain(hModule, ul_reason_for_call); |
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| 16 | return TRUE; |
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| 17 | } |
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| 18 | |
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| 19 | NRPEListener::NRPEListener() { |
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| 20 | } |
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| 21 | NRPEListener::~NRPEListener() { |
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| 22 | } |
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| 23 | |
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| 24 | std::string getAllowedHosts() { |
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| 25 | std::string ret = NSCModuleHelper::getSettingsString(NRPE_SECTION_TITLE, MAIN_ALLOWED_HOSTS, ""); |
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| 26 | if (ret.empty()) |
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| 27 | ret = NSCModuleHelper::getSettingsString(MAIN_SECTION_TITLE, MAIN_ALLOWED_HOSTS, MAIN_ALLOWED_HOSTS_DEFAULT); |
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| 28 | return ret; |
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| 29 | } |
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| 30 | bool getCacheAllowedHosts() { |
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| 31 | int val = NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, MAIN_ALLOWED_HOSTS_CACHE, -1); |
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| 32 | if (val == -1) |
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| 33 | val = NSCModuleHelper::getSettingsInt(MAIN_SECTION_TITLE, MAIN_ALLOWED_HOSTS_CACHE, MAIN_ALLOWED_HOSTS_CACHE_DEFAULT); |
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| 34 | return val==1?true:false; |
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| 35 | } |
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| 36 | |
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| 37 | bool NRPEListener::loadModule() { |
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| 38 | bUseSSL_ = NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_USE_SSL ,NRPE_SETTINGS_USE_SSL_DEFAULT)==1; |
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| 39 | timeout = NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_TIMEOUT ,NRPE_SETTINGS_TIMEOUT_DEFAULT); |
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| 40 | std::list<std::string> commands = NSCModuleHelper::getSettingsSection(NRPE_HANDLER_SECTION_TITLE); |
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| 41 | std::list<std::string>::const_iterator it; |
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| 42 | for (it = commands.begin(); it != commands.end(); ++it) { |
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| 43 | std::string command_name; |
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| 44 | if (((*it).length() > 7)&&((*it).substr(0,7) == "command")) { |
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| 45 | strEx::token t = strEx::getToken((*it), '['); |
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| 46 | t = strEx::getToken(t.second, ']'); |
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| 47 | command_name = t.first; |
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| 48 | } else { |
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| 49 | command_name = (*it); |
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| 50 | } |
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| 51 | std::string s = NSCModuleHelper::getSettingsString(NRPE_HANDLER_SECTION_TITLE, (*it), ""); |
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| 52 | if (command_name.empty() || s.empty()) { |
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| 53 | NSC_LOG_ERROR_STD("Invalid command definition: " + (*it)); |
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| 54 | } else { |
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| 55 | addCommand(command_name.c_str(), s); |
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| 56 | } |
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| 57 | } |
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| 58 | |
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| 59 | allowedHosts.setAllowedHosts(strEx::splitEx(getAllowedHosts(), ","), getCacheAllowedHosts()); |
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| 60 | try { |
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| 61 | unsigned short port = NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_PORT, NRPE_SETTINGS_PORT_DEFAULT); |
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| 62 | std::string host = NSCModuleHelper::getSettingsString(NRPE_SECTION_TITLE, NRPE_SETTINGS_BINDADDR, NRPE_SETTINGS_BINDADDR_DEFAULT); |
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| 63 | unsigned int backLog = NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_LISTENQUE, NRPE_SETTINGS_LISTENQUE_DEFAULT); |
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| 64 | if (bUseSSL_) { |
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| 65 | socket_ssl_.setHandler(this); |
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| 66 | socket_ssl_.StartListener(host, port, backLog); |
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| 67 | } else { |
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| 68 | socket_.setHandler(this); |
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| 69 | socket_.StartListener(host, port, backLog); |
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| 70 | } |
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| 71 | } catch (simpleSocket::SocketException e) { |
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| 72 | NSC_LOG_ERROR_STD("Exception caught: " + e.getMessage()); |
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| 73 | return false; |
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| 74 | } catch (simpleSSL::SSLException e) { |
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| 75 | NSC_LOG_ERROR_STD("Exception caught: " + e.getMessage()); |
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| 76 | return false; |
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| 77 | } |
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| 78 | |
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| 79 | return true; |
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| 80 | } |
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| 81 | bool NRPEListener::unloadModule() { |
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| 82 | try { |
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| 83 | if (bUseSSL_) { |
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| 84 | socket_ssl_.removeHandler(this); |
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| 85 | if (socket_ssl_.hasListener()) |
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| 86 | socket_ssl_.StopListener(); |
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| 87 | } else { |
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| 88 | socket_.removeHandler(this); |
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| 89 | if (socket_.hasListener()) |
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| 90 | socket_.StopListener(); |
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| 91 | } |
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| 92 | } catch (simpleSocket::SocketException e) { |
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| 93 | NSC_LOG_ERROR_STD("Exception caught: " + e.getMessage()); |
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| 94 | return false; |
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| 95 | } catch (simpleSSL::SSLException e) { |
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| 96 | NSC_LOG_ERROR_STD("Exception caught: " + e.getMessage()); |
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| 97 | return false; |
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| 98 | } |
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| 99 | return true; |
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| 100 | } |
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| 101 | |
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| 102 | |
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| 103 | bool NRPEListener::hasCommandHandler() { |
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| 104 | return true; |
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| 105 | } |
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| 106 | bool NRPEListener::hasMessageHandler() { |
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| 107 | return false; |
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| 108 | } |
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| 109 | |
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| 110 | |
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| 111 | NSCAPI::nagiosReturn NRPEListener::handleCommand(const strEx::blindstr command, const unsigned int argLen, char **char_args, std::string &message, std::string &perf) { |
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| 112 | commandList::iterator it = commands.find(command); |
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| 113 | if (it == commands.end()) |
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| 114 | return NSCAPI::returnIgnored; |
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| 115 | |
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| 116 | std::string str = (*it).second; |
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| 117 | if (NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_ALLOW_ARGUMENTS, NRPE_SETTINGS_ALLOW_ARGUMENTS_DEFAULT) == 1) { |
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| 118 | arrayBuffer::arrayList arr = arrayBuffer::arrayBuffer2list(argLen, char_args); |
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| 119 | arrayBuffer::arrayList::const_iterator cit = arr.begin(); |
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| 120 | int i=1; |
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| 121 | |
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| 122 | for (;cit!=arr.end();cit++,i++) { |
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| 123 | if (NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_ALLOW_NASTY_META, NRPE_SETTINGS_ALLOW_NASTY_META_DEFAULT) == 0) { |
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| 124 | if ((*cit).find_first_of(NASTY_METACHARS) != std::string::npos) { |
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| 125 | NSC_LOG_ERROR("Request string contained illegal metachars!"); |
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| 126 | return NSCAPI::returnIgnored; |
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| 127 | } |
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| 128 | } |
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| 129 | strEx::replace(str, "$ARG" + strEx::itos(i) + "$", (*cit)); |
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| 130 | } |
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| 131 | } |
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| 132 | |
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| 133 | if ((str.substr(0,6) == "inject")&&(str.length() > 7)) { |
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| 134 | strEx::token t = strEx::getToken(str.substr(7), ' '); |
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| 135 | std::string s = t.second; |
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| 136 | std::string sTarget; |
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| 137 | |
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| 138 | std::string::size_type p = 0; |
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| 139 | while(true) { |
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| 140 | std::string::size_type pStart = p; |
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| 141 | std::string::size_type pEnd = std::string::npos; |
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| 142 | if (s[p] == '\"') { |
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| 143 | pStart++; |
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| 144 | while (true) { |
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| 145 | p = s.find(' ', ++p); |
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| 146 | if (p == std::string::npos) |
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| 147 | break; |
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| 148 | if ((p>1)&&(s[p-1]=='\"')&&(((p>2)&&(s[p-2]!='\\'))||(p==2))) |
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| 149 | break; |
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| 150 | } |
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| 151 | if (p != std::string::npos) |
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| 152 | pEnd = p-1; |
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| 153 | else |
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| 154 | pEnd = s.length()-1; |
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| 155 | |
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| 156 | } else { |
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| 157 | pEnd = p = s.find(' ', ++p); |
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| 158 | } |
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| 159 | if (!sTarget.empty()) |
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| 160 | sTarget += "!"; |
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| 161 | if (p == std::string::npos) { |
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| 162 | if (pEnd == std::string::npos) |
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| 163 | sTarget += s.substr(pStart); |
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| 164 | else |
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| 165 | sTarget += s.substr(pStart, pEnd-pStart); |
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| 166 | break; |
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| 167 | } |
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| 168 | sTarget += s.substr(pStart,pEnd-pStart); |
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| 169 | p++; |
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| 170 | } |
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| 171 | return NSCModuleHelper::InjectSplitAndCommand(t.first, sTarget, '!', message, perf); |
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| 172 | } |
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| 173 | |
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| 174 | return executeNRPECommand(str, message, perf); |
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| 175 | } |
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| 176 | #define MAX_INPUT_BUFFER 1024 |
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| 177 | |
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| 178 | int NRPEListener::executeNRPECommand(std::string command, std::string &msg, std::string &perf) |
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| 179 | { |
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| 180 | NSCAPI::nagiosReturn result; |
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| 181 | PROCESS_INFORMATION pi; |
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| 182 | STARTUPINFO si; |
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| 183 | HANDLE hChildOutR, hChildOutW, hChildInR, hChildInW; |
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| 184 | SECURITY_ATTRIBUTES sec; |
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| 185 | DWORD dwstate, dwexitcode; |
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| 186 | int retval; |
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| 187 | |
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| 188 | |
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| 189 | // Set up members of SECURITY_ATTRIBUTES structure. |
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| 190 | |
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| 191 | sec.nLength = sizeof(SECURITY_ATTRIBUTES); |
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| 192 | sec.bInheritHandle = TRUE; |
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| 193 | sec.lpSecurityDescriptor = NULL; |
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| 194 | |
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| 195 | // Create Pipes |
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| 196 | CreatePipe(&hChildInR, &hChildInW, &sec, 0); |
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| 197 | CreatePipe(&hChildOutR, &hChildOutW, &sec, 0); |
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| 198 | |
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| 199 | // Set up members of STARTUPINFO structure. |
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| 200 | |
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| 201 | ZeroMemory(&si, sizeof(STARTUPINFO)); |
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| 202 | si.cb = sizeof(STARTUPINFO); |
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| 203 | si.dwFlags = STARTF_USESTDHANDLES; |
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| 204 | si.hStdInput = hChildInR; |
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| 205 | si.hStdOutput = hChildOutW; |
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| 206 | si.hStdError = hChildOutW; |
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| 207 | |
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| 208 | |
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| 209 | // CreateProcess doesn't work with a const command |
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| 210 | char *cmd = new char[command.length()+1]; |
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| 211 | strncpy(cmd, command.c_str(), command.length()); |
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| 212 | cmd[command.length()] = 0; |
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| 213 | |
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| 214 | // Create the child process. |
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| 215 | BOOL processOK = CreateProcess(NULL, cmd, // command line |
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| 216 | NULL, // process security attributes |
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| 217 | NULL, // primary thread security attributes |
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| 218 | TRUE, // handles are inherited |
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| 219 | 0, // creation flags |
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| 220 | NULL, // use parent's environment |
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| 221 | NULL, // use parent's current directory |
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| 222 | &si, // STARTUPINFO pointer |
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| 223 | &pi); // receives PROCESS_INFORMATION |
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| 224 | delete [] cmd; |
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| 225 | |
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| 226 | if (processOK) { |
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| 227 | dwstate = WaitForSingleObject(pi.hProcess, 1000*timeout); |
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| 228 | CloseHandle(hChildInR); |
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| 229 | CloseHandle(hChildInW); |
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| 230 | CloseHandle(hChildOutW); |
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| 231 | |
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| 232 | if (dwstate == WAIT_TIMEOUT) { |
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| 233 | TerminateProcess(pi.hProcess, 5); |
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| 234 | msg = "The check didn't respond within the timeout period!"; |
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| 235 | result = NSCAPI::returnUNKNOWN; |
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| 236 | } else { |
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| 237 | DWORD dwread; |
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| 238 | char *buf = new char[MAX_INPUT_BUFFER+1]; |
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| 239 | retval = ReadFile(hChildOutR, buf, MAX_INPUT_BUFFER, &dwread, NULL); |
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| 240 | if (!retval || dwread == 0) { |
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| 241 | msg = "No output available from command..."; |
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| 242 | } else { |
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| 243 | buf[dwread] = 0; |
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| 244 | msg = buf; |
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| 245 | strEx::token t = strEx::getToken(msg, '\n'); |
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| 246 | t = strEx::getToken(t.first, '|'); |
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| 247 | msg = t.first; |
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| 248 | perf = t.second; |
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| 249 | } |
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| 250 | delete [] buf; |
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| 251 | GetExitCodeProcess(pi.hProcess, &dwexitcode); |
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| 252 | result = NSCHelper::int2nagios(dwexitcode); |
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| 253 | } |
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| 254 | CloseHandle(pi.hThread); |
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| 255 | CloseHandle(pi.hProcess); |
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| 256 | CloseHandle(hChildOutR); |
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| 257 | } |
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| 258 | else { |
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| 259 | msg = "NRPE_NT failed to create process, exiting..."; |
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| 260 | result = NSCAPI::returnUNKNOWN; |
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| 261 | CloseHandle(hChildInR); |
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| 262 | CloseHandle(hChildInW); |
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| 263 | CloseHandle(hChildOutW); |
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| 264 | CloseHandle(pi.hThread); |
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| 265 | CloseHandle(pi.hProcess); |
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| 266 | CloseHandle(hChildOutR); |
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| 267 | } |
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| 268 | return result; |
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| 269 | } |
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| 270 | void NRPEListener::onClose() |
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| 271 | {} |
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| 272 | |
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| 273 | void NRPEListener::onAccept(simpleSocket::Socket *client) |
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| 274 | { |
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| 275 | if (!allowedHosts.inAllowedHosts(client->getAddrString())) { |
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| 276 | NSC_LOG_ERROR("Unothorized access from: " + client->getAddrString()); |
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| 277 | client->close(); |
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| 278 | return; |
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| 279 | } |
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| 280 | try { |
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| 281 | simpleSocket::DataBuffer block; |
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| 282 | |
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| 283 | for (int i=0;i<100;i++) { |
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| 284 | client->readAll(block, 1048); |
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| 285 | if (block.getLength() >= NRPEPacket::getBufferLength()) |
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| 286 | break; |
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| 287 | Sleep(100); |
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| 288 | } |
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| 289 | if (i == 100) { |
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| 290 | NSC_LOG_ERROR_STD("Could not retrieve NRPE packet."); |
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| 291 | client->close(); |
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| 292 | return; |
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| 293 | } |
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| 294 | if (block.getLength() == NRPEPacket::getBufferLength()) { |
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| 295 | try { |
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| 296 | NRPEPacket out = handlePacket(NRPEPacket(block.getBuffer(), block.getLength())); |
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| 297 | block.copyFrom(out.getBuffer(), out.getBufferLength()); |
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| 298 | } catch (NRPEPacket::NRPEPacketException e) { |
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| 299 | NSC_LOG_ERROR_STD("NRPESocketException: " + e.getMessage()); |
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| 300 | client->close(); |
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| 301 | return; |
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| 302 | } |
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| 303 | client->send(block); |
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| 304 | } |
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| 305 | } catch (simpleSocket::SocketException e) { |
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| 306 | NSC_LOG_ERROR_STD("SocketException: " + e.getMessage()); |
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| 307 | } catch (NRPEException e) { |
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| 308 | NSC_LOG_ERROR_STD("NRPEException: " + e.getMessage()); |
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| 309 | } |
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| 310 | client->close(); |
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| 311 | } |
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| 312 | |
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| 313 | NRPEPacket NRPEListener::handlePacket(NRPEPacket p) { |
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| 314 | if (p.getType() != NRPEPacket::queryPacket) { |
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| 315 | NSC_LOG_ERROR("Request is not a query."); |
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| 316 | throw NRPEException("Invalid query type"); |
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| 317 | } |
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| 318 | if (p.getVersion() != NRPEPacket::version2) { |
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| 319 | NSC_LOG_ERROR("Request had unsupported version."); |
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| 320 | throw NRPEException("Invalid version"); |
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| 321 | } |
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| 322 | if (!p.verifyCRC()) { |
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| 323 | NSC_LOG_ERROR("Request had invalid checksum."); |
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| 324 | throw NRPEException("Invalid checksum"); |
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| 325 | } |
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| 326 | strEx::token cmd = strEx::getToken(p.getPayload(), '!'); |
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| 327 | std::string msg, perf; |
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| 328 | |
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| 329 | if (NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_ALLOW_ARGUMENTS, NRPE_SETTINGS_ALLOW_ARGUMENTS_DEFAULT) == 0) { |
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| 330 | if (!cmd.second.empty()) { |
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| 331 | NSC_LOG_ERROR("Request contained arguments (not currently allowed)."); |
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| 332 | throw NRPEException("Request contained arguments (not currently allowed)."); |
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| 333 | } |
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| 334 | } |
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| 335 | if (NSCModuleHelper::getSettingsInt(NRPE_SECTION_TITLE, NRPE_SETTINGS_ALLOW_NASTY_META, NRPE_SETTINGS_ALLOW_NASTY_META_DEFAULT) == 0) { |
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| 336 | if (cmd.first.find_first_of(NASTY_METACHARS) != std::string::npos) { |
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| 337 | NSC_LOG_ERROR("Request command contained illegal metachars!"); |
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| 338 | throw NRPEException("Request command contained illegal metachars!"); |
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| 339 | } |
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| 340 | if (cmd.second.find_first_of(NASTY_METACHARS) != std::string::npos) { |
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| 341 | NSC_LOG_ERROR("Request arguments contained illegal metachars!"); |
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| 342 | throw NRPEException("Request command contained illegal metachars!"); |
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| 343 | } |
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| 344 | } |
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| 345 | |
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| 346 | NSCAPI::nagiosReturn ret = NSCModuleHelper::InjectSplitAndCommand(cmd.first, cmd.second, '!', msg, perf); |
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| 347 | if (perf.empty()) { |
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| 348 | return NRPEPacket(NRPEPacket::responsePacket, NRPEPacket::version2, ret, msg); |
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| 349 | } else { |
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| 350 | return NRPEPacket(NRPEPacket::responsePacket, NRPEPacket::version2, ret, msg + "|" + perf); |
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| 351 | } |
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| 352 | } |
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| 353 | |
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| 354 | NSC_WRAPPERS_MAIN_DEF(gNRPEListener); |
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| 355 | NSC_WRAPPERS_IGNORE_MSG_DEF(); |
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| 356 | NSC_WRAPPERS_HANDLE_CMD_DEF(gNRPEListener); |
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| 357 | NSC_WRAPPERS_HANDLE_CONFIGURATION(gNRPEListener); |
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| 358 | |
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| 359 | |
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| 360 | MODULE_SETTINGS_START(NRPEListener, "NRPE Listsner configuration", "...") |
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| 361 | |
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| 362 | PAGE("NRPE Listsner configuration") |
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| 363 | |
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| 364 | ITEM_EDIT_TEXT("port", "This is the port the NRPEListener.dll will listen to.") |
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| 365 | ITEM_MAP_TO("basic_ini_text_mapper") |
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| 366 | OPTION("section", "NRPE") |
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| 367 | OPTION("key", "port") |
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| 368 | OPTION("default", "5666") |
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| 369 | ITEM_END() |
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| 370 | |
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| 371 | ITEM_CHECK_BOOL("allow_arguments", "This option determines whether or not the NRPE daemon will allow clients to specify arguments to commands that are executed.") |
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| 372 | ITEM_MAP_TO("basic_ini_bool_mapper") |
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| 373 | OPTION("section", "NRPE") |
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| 374 | OPTION("key", "allow_arguments") |
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| 375 | OPTION("default", "false") |
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| 376 | OPTION("true_value", "1") |
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| 377 | OPTION("false_value", "0") |
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| 378 | ITEM_END() |
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| 379 | |
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| 380 | ITEM_CHECK_BOOL("allow_nasty_meta_chars", "This might have security implications (depending on what you do with the options)") |
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| 381 | ITEM_MAP_TO("basic_ini_bool_mapper") |
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| 382 | OPTION("section", "NRPE") |
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| 383 | OPTION("key", "allow_nasty_meta_chars") |
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| 384 | OPTION("default", "false") |
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| 385 | OPTION("true_value", "1") |
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| 386 | OPTION("false_value", "0") |
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| 387 | ITEM_END() |
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| 388 | |
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| 389 | ITEM_CHECK_BOOL("use_ssl", "This option will enable SSL encryption on the NRPE data socket (this increases security somwhat.") |
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| 390 | ITEM_MAP_TO("basic_ini_bool_mapper") |
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| 391 | OPTION("section", "NRPE") |
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| 392 | OPTION("key", "use_ssl") |
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| 393 | OPTION("default", "true") |
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| 394 | OPTION("true_value", "1") |
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| 395 | OPTION("false_value", "0") |
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| 396 | ITEM_END() |
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| 397 | |
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| 398 | PAGE_END() |
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| 399 | ADVANCED_PAGE("Access configuration") |
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| 400 | |
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| 401 | ITEM_EDIT_OPTIONAL_LIST("Allow connection from:", "This is the hosts that will be allowed to poll performance data from the NRPE server.") |
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| 402 | OPTION("disabledCaption", "Use global settings (defined previously)") |
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| 403 | OPTION("enabledCaption", "Specify hosts for NRPE server") |
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| 404 | OPTION("listCaption", "Add all IP addresses (not hosts) which should be able to connect:") |
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| 405 | OPTION("separator", ",") |
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| 406 | OPTION("disabled", "") |
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| 407 | ITEM_MAP_TO("basic_ini_text_mapper") |
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| 408 | OPTION("section", "NRPE") |
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| 409 | OPTION("key", "allowed_hosts") |
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| 410 | OPTION("default", "") |
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| 411 | ITEM_END() |
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| 412 | |
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| 413 | PAGE_END() |
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| 414 | MODULE_SETTINGS_END() |
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