1 | /*
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2 | * Search4j utility
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3 | * Command Line utility to search a system for java, launch a jar, or compare java versions
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4 | * base on launch4j
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5 | */
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6 |
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7 | #include <iostream>
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8 | #include <fstream>
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9 | #include <string>
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10 | #include <sstream>
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11 |
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12 | using namespace std;
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13 |
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14 | #ifdef WINDOWS
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15 | #include <windows.h>
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16 |
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17 | //minimal launch4j stuff
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18 | #define NO_JAVA_FOUND 0
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19 | #define FOUND_JRE 1
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20 | #define FOUND_SDK 2
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21 | int foundJava = NO_JAVA_FOUND;
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22 | char foundJavaVer[128] = {0};
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23 |
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24 | //windows functions
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25 | #define popen _popen
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26 | #define strcmp _stricmp
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27 | #endif /* WINDOWS */
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28 |
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29 |
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30 | //global variables
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31 | bool verbose = false;
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32 | bool use_minimum = false;
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33 | string hint = "";
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34 |
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35 | enum JvmProperty {
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36 | JavaHome,
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37 | Version,
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38 | Executable
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39 | };
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40 |
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41 | enum Action {
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42 | Find,
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43 | Launch,
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44 | Compare
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45 | };
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46 |
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47 | void replace_all ( std::string & str, std::string const & pattern, std::string const & replacement ) {
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48 |
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49 | std::string::size_type start = str.find( pattern, 0 );
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50 |
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51 | while ( start != str.npos ) {
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52 | str.replace( start, pattern.size(), replacement );
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53 | start = str.find( pattern, start+replacement.size() );
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54 | }
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55 |
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56 | }
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57 |
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58 | int process( string command, string &output ) {
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59 |
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60 | FILE *pPipe;
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61 |
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62 | /* Run command so that it writes its output to a pipe. Open this
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63 | * pipe with read text attribute so that we can read it
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64 | * like a text file. */
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65 | char cmd[1024]; strcpy(cmd, command.c_str());
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66 | //if ( verbose ) cout << "process(): running '" << command << "'" << endl;
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67 | #ifdef WINDOWS
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68 | if( (pPipe = popen( cmd, "rt" )) == NULL ) {
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69 | if ( verbose ) cout << "could not start process" << endl;
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70 | pclose( pPipe );
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71 | return -1;
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72 | }
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73 | #endif
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74 | #ifndef WINDOWS
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75 | if( (pPipe = popen( cmd, "r" )) == NULL ) {
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76 | if ( verbose ) cout << "could not start process" << endl;
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77 | pclose( pPipe );
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78 | return -1;
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79 | }
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80 | #endif
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81 |
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82 | //if ( verbose ) cout << "started process" << endl;
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83 |
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84 | /* Read pipe until end of file. */
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85 | while( !feof( pPipe ) ) {
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86 | char psBuffer[128];
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87 | //if ( verbose ) cout << "get some data" << endl;
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88 | if( fgets( psBuffer, 128, pPipe ) != NULL ) {
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89 |
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90 | //if ( verbose ) cout << "got: " << psBuffer << endl;
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91 | output.append( psBuffer );
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92 |
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93 | } else {
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94 | //if ( verbose ) cout << "none left" << endl;
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95 | }
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96 |
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97 | }
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98 |
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99 | /* Close pipe and return return value of pPipe. */
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100 | int code = pclose( pPipe );
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101 | return code;
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102 | }
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103 |
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104 | class Jvm {
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105 |
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106 | string javaHome;
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107 |
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108 | // version string. era.major.minor_update. eg: 1.4.2_02
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109 | int era;
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110 | int major;
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111 | int minor;
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112 | int update;
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113 |
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114 | bool isJdk;
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115 | bool healthy;
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116 |
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117 |
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118 | public:
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119 | Jvm() {
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120 | healthy = false;
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121 | }
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122 |
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123 | void setJavaHome( string jh ) {
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124 | healthy = true;
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125 | javaHome = jh;
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126 | setVersionFromExeOuput();
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127 | }
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128 |
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129 | string getJavaHome() {
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130 | return javaHome;
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131 | }
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132 |
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133 | string getExecutable() {
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134 | string exec = "";
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135 | exec.append( javaHome );
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136 |
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137 | #ifdef WINDOWS
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138 | exec.append( "\\bin\\java.exe" );
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139 | #endif
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140 |
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141 | #ifndef WINDOWS
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142 | exec.append( "/bin/java" );
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143 | #endif
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144 |
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145 | return exec;
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146 | }
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147 |
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148 | string getVersion() {
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149 | stringstream ss;
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150 | ss << era << "." << major << "." << minor << "_" << update;
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151 | return ss.str();
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152 | }
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153 |
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154 | bool check() {
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155 | return healthy;
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156 | }
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157 |
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158 | bool setVersionFromString( string version ) {
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159 | era = atoi( version.substr(0,1).c_str() );
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160 | major = atoi( version.substr(2,1).c_str() );
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161 | minor = atoi( version.substr(4,1).c_str() );
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162 | update = atoi( version.substr(6,2).c_str() );
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163 | return true;
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164 | }
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165 |
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166 | int compare( Jvm otherJvm ) {
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167 | //era
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168 | if ( era > otherJvm.getEra() )
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169 | return 1;
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170 | else if ( era < otherJvm.getEra() )
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171 | return -1;
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172 |
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173 | //major
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174 | if ( major > otherJvm.getMajor() )
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175 | return 1;
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176 | else if ( major < otherJvm.getMajor() )
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177 | return -1;
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178 |
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179 | //minor
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180 | if ( minor > otherJvm.getMinor() )
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181 | return 1;
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182 | else if ( minor < otherJvm.getMinor() )
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183 | return -1;
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184 |
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185 | //update
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186 | if ( update > otherJvm.getUpdate() )
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187 | return 1;
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188 | else if ( update < otherJvm.getUpdate() )
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189 | return -1;
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190 |
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191 | //all the same so far, must be exactly the same
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192 | return 0;
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193 |
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194 | }
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195 |
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196 | int getEra() { return era; }
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197 | int getMajor() { return major; }
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198 | int getMinor() { return minor; }
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199 | int getUpdate() { return update; }
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200 |
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201 | private:
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202 |
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203 | void setVersionFromExeOuput() {
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204 | string command = "", output = "";
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205 | command.append( "\"" );
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206 | command.append( getExecutable() );
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207 | command.append( "\"" );
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208 | command.append(" -version 2>&1");
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209 | //cout << "(command: " << command << ")";
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210 | int result = process( command, output );
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211 | //cout << "(output: " << output << ")";
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212 | if ( result == 0 ) {
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213 | if ( strcmp( output.substr( 0, 12 ).c_str() , "java version" ) == 0 || true ) {
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214 | era = atoi( output.substr(14,1).c_str() );
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215 | major = atoi( output.substr(16,1).c_str() );
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216 | minor = atoi( output.substr(18,1).c_str() );
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217 | update = atoi( output.substr(20,2).c_str() );
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218 | //if ( verbose) cout << "set version to: " << era << "." << major << "." << minor << "_" << update << endl;
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219 | } else {
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220 | healthy=false;
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221 | }
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222 | } else {
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223 | healthy = false;
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224 | }
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225 | }
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226 |
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227 |
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228 | };
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229 |
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230 | string actionToString( Action a ) {
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231 | if ( a == Find )
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232 | return "Find";
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233 | else if ( a == Launch )
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234 | return "Launch";
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235 | else if ( a == Compare )
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236 | return "Compare";
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237 | return "Unknown";
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238 | }
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239 |
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240 | string jvmPropertyToString( JvmProperty jp ) {
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241 | if ( jp == JavaHome )
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242 | return "JavaHome";
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243 | else if ( jp == Version )
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244 | return "Version";
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245 | else if ( jp == Executable )
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246 | return "Executable";
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247 | return "Unknown";
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248 | }
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249 |
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250 | void usage() {
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251 |
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252 | cout
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253 | << "-----------------" << endl
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254 | << " search4j: usage" << endl
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255 | << "-----------------" << endl
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256 | << "Three usage methods: find, compare and launch" << endl
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257 | << endl
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258 | << "find: find java and print out information about it" << endl
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259 | << endl
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260 | << " search4j [-v|-e]" << endl
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261 | << " eg: search4j -e" << endl
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262 | << endl
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263 | << " by default, print JAVA_HOME. E.g., C:\\Program Files\\jre1.5.0_15, or" << endl
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264 | << " if -v is specified, print the java version string. E.g. 1.5.0_15, or" << endl
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265 | << " if -e is specified, print the path the to the java executable. E.g. C:\\Program Files\\jre1.5.0_15\\bin\\java.exe" << endl
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266 | << endl
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267 | << "compare: compare the found java with the given java version string" << endl
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268 | << endl
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269 | << " search4j -c VERSION_STRING" << endl
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270 | << " eg: search4j -c VERSION_STRING" << endl
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271 | << endl
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272 | << " print -1 if found java is older" << endl
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273 | << " print 0 if found java is same" << endl
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274 | << " print 1 if found java is newer" << endl
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275 | << endl
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276 | << "launch: launch the given executable jar with the found java" << endl
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277 | << endl
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278 | << " search4j -l EXECUTABLE_JAR [-m VERSION_STRING]" << endl
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279 | << " eg: search4j -l greenstone3.jar" << endl
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280 | << endl
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281 | << " specify the location of the jar relative to the current directory" << endl
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282 | << endl
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283 | << "Global Options:" << endl
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284 | << " -m VERSION_STRING: (minimum) find a java of the given version or newer, or fail" << endl
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285 | << " -h LOCATION: (hint) as a last resort look for java in LOCATION (treated as a JAVA_HOME)" << endl
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286 | << " --verbose : have search4j print out information about what its doing" << endl
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287 | << " --help : display this usage screen" << endl
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288 | << endl
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289 | ;
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290 | }
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291 |
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292 | //another global
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293 | Jvm minimum;
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294 |
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295 | #ifdef WINDOWS
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296 | void regSearch(HKEY hKey, const char* keyName, int searchType) {
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297 | DWORD x = 0;
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298 | unsigned long size = 1024;
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299 | FILETIME time;
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300 | char buffer[1024] = {0};
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301 | while (RegEnumKeyEx(
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302 | hKey, // handle to key to enumerate
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303 | x++, // index of subkey to enumerate
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304 | buffer, // address of buffer for subkey name
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305 | &size, // address for size of subkey buffer
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306 | NULL, // reserved
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307 | NULL, // address of buffer for class string
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308 | NULL, // address for size of class buffer
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309 | &time) == ERROR_SUCCESS) {
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310 | strcpy(foundJavaVer, buffer);
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311 | foundJava = searchType;
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312 | size = 1024;
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313 | }
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314 | }
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315 | #endif
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316 |
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317 | /*
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318 | * function to find java
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319 | * implements the logic drawn on the dl lab whiteboard in feb 08
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320 | * return a Jvm object which represents the jvm on disk
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321 | */
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322 | bool find( Jvm &jvm ) {
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323 |
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324 | if ( verbose ) cout << "Searching for a JVM" << endl;
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325 | char *javaHome = "";
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326 | bool jvmFound = false;
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327 |
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328 | if ( !jvmFound ) {
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329 | //try JAVA_HOME
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330 | if ( verbose ) cout << " - trying JAVA_HOME: ";
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331 | javaHome = getenv( "JAVA_HOME" );
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332 | if ( javaHome != NULL ) {
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333 | if ( verbose ) cout << "(" << javaHome << ") ";
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334 | jvm.setJavaHome( javaHome );
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335 | if ( jvm.check() ) {
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336 | if ( use_minimum ) {
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337 | if ( jvm.compare( minimum ) >= 0 ) {
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338 | jvmFound = true;
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339 | }
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340 | } else {
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341 | jvmFound = true;
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342 | }
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343 | }
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344 | }
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345 | if ( verbose ) { if( jvmFound ) cout << "yes" << endl; else cout << "no" << endl; }
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346 | }
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347 |
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348 | if ( !jvmFound ) {
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349 | //try JRE_HOME
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350 | if ( verbose ) cout << " - trying JRE_HOME: ";
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351 | javaHome = getenv( "JRE_HOME" );
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352 | if ( javaHome != NULL ) {
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353 | if ( verbose ) cout << "(" << javaHome << ") ";
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354 | jvm.setJavaHome( javaHome );
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355 | if ( jvm.check() ) {
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356 | if ( use_minimum ) {
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357 | if ( jvm.compare( minimum ) >= 0 ) {
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358 | jvmFound = true;
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359 | }
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360 | } else {
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361 | jvmFound = true;
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362 | }
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363 | }
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364 | }
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365 | if ( verbose ) { if( jvmFound ) cout << "yes" << endl; else cout << "no" << endl; }
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366 | }
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367 |
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368 | #ifdef WINDOWS
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369 | if ( !jvmFound ) {
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370 | //try the registry - this code based on launch4j code
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371 | if ( verbose ) cout << " - trying the registry: ";
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372 | HKEY hKey;
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373 | const char jre[] = "SOFTWARE\\JavaSoft\\Java Runtime Environment";
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374 | const char sdk[] = "SOFTWARE\\JavaSoft\\Java Development Kit";
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375 |
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376 | if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(jre), 0, KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, &hKey) == ERROR_SUCCESS ) {
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377 | regSearch(hKey, jre, FOUND_JRE);
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378 | RegCloseKey(hKey);
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379 | }
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380 |
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381 | if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(sdk), 0, KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, &hKey) == ERROR_SUCCESS ) {
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382 | regSearch(hKey, sdk, FOUND_SDK);
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383 | RegCloseKey(hKey);
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384 | }
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385 |
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386 | if ( foundJava != NO_JAVA_FOUND ) {
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387 | char path[1024] = {0};
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388 | char keyBuffer[1024];
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389 | unsigned long datatype;
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390 | unsigned long bufferlength = 1024;
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391 | if (foundJava == FOUND_JRE) {
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392 | strcpy(keyBuffer, jre);
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393 | } else {
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394 | strcpy(keyBuffer, sdk);
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395 | }
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396 | strcat(keyBuffer, "\\");
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397 | strcat(keyBuffer, foundJavaVer);
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398 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(keyBuffer), 0, KEY_QUERY_VALUE, &hKey) == ERROR_SUCCESS) {
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399 | unsigned char buffer[1024] = {0};
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400 | if (RegQueryValueEx(hKey, "JavaHome", NULL, &datatype, buffer, &bufferlength) == ERROR_SUCCESS) {
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401 | int i = 0;
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402 | do {
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403 | path[i] = buffer[i];
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404 | } while (path[i++] != 0);
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405 | if (foundJava == FOUND_SDK) {
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406 | strcat(path, "\\jre");
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407 | }
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408 | jvm.setJavaHome( path );
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409 | if ( jvm.check() ) {
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410 | if ( use_minimum ) {
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411 | if ( jvm.compare( minimum ) >= 0 ) {
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412 | jvmFound = true;
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413 | }
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414 | } else {
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415 | jvmFound = true;
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416 | }
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417 | }
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418 | }
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419 | RegCloseKey(hKey);
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420 | }
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421 | }
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422 | if ( verbose ) { if( jvmFound ) cout << "yes" << endl; else cout << "no" << endl; }
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423 | }
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424 | #endif
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425 |
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426 | if ( !jvmFound ) {
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427 | //try the hint
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428 | if ( verbose ) cout << " - trying hint: ";
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429 | if ( strcmp(hint.c_str(),"") != 0 ) {
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430 | if ( verbose ) cout << "(" << hint << ") ";
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431 | jvm.setJavaHome( hint );
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432 | if ( jvm.check() ) {
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433 | if ( use_minimum ) {
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434 | if ( jvm.compare( minimum ) >= 0 ) {
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435 | jvmFound = true;
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436 | }
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437 | } else {
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438 | jvmFound = true;
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439 | }
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440 | }
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441 | }
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442 | if ( verbose ) { if( jvmFound ) cout << "yes" << endl; else cout << "no" << endl; }
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443 | }
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444 |
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445 |
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446 | return jvmFound;
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447 | }
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448 |
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449 | int main ( int argc, char** argv ) {
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450 | //cout << "testing process()" << endl;
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451 | //string out = "";
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452 | //process( "dir", out );
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453 | //cout << out << endl;
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454 | //return 0;
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455 |
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456 |
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457 | JvmProperty jvmProperty = JavaHome;
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458 | Action action = Find;
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459 | string arg1 = "";
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460 |
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461 | //parse commandline arguments
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462 | for (int i=1; i<argc; i++) {
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463 | if ( strcmp(argv[i], "--verbose") == 0 ) {
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464 | verbose = true;
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465 | } else if ( strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "--usage") == 0 ) {
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466 | usage();
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467 | return 0;
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468 | } else if ( strcmp(argv[i], "-v") == 0 ) {
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469 | jvmProperty = Version;
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470 | } else if ( strcmp(argv[i], "-e") == 0 ) {
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471 | jvmProperty = Executable;
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472 | } else if ( strcmp(argv[i], "-c") == 0 ) {
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473 | action = Compare;
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474 | if ( i == argc-1 ) {
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475 | usage();
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476 | return -1;
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477 | } else {
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478 | arg1 = argv[++i];
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479 | }
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480 |
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481 | } else if ( strcmp(argv[i], "-m") == 0 ) {
|
---|
482 | if ( i == argc-1 ) {
|
---|
483 | usage();
|
---|
484 | return -1;
|
---|
485 | } else {
|
---|
486 | if ( !minimum.setVersionFromString( argv[++i] ) ) {
|
---|
487 | usage();
|
---|
488 | return 0;
|
---|
489 | }
|
---|
490 | use_minimum = true;
|
---|
491 | }
|
---|
492 |
|
---|
493 | } else if ( strcmp(argv[i], "-l") == 0 ) {
|
---|
494 | if ( i == argc-1 ) {
|
---|
495 | usage();
|
---|
496 | return -1;
|
---|
497 | } else {
|
---|
498 | action = Launch;
|
---|
499 | arg1 = argv[++i];
|
---|
500 | }
|
---|
501 |
|
---|
502 | } else if ( strcmp(argv[i], "-h") == 0 ) {
|
---|
503 | if ( i == argc-1 ) {
|
---|
504 | usage();
|
---|
505 | return -1;
|
---|
506 | } else {
|
---|
507 | hint = argv[++i];
|
---|
508 | }
|
---|
509 |
|
---|
510 | } else {
|
---|
511 | cout << "unknown option: " << argv[i] << endl;
|
---|
512 | return -1;
|
---|
513 | }
|
---|
514 | }
|
---|
515 |
|
---|
516 | //summarise commandline arguments
|
---|
517 | if ( verbose ) {
|
---|
518 | cout << "Action: " << actionToString( action ) << endl;
|
---|
519 | }
|
---|
520 |
|
---|
521 | //find java
|
---|
522 | Jvm foundJvm;
|
---|
523 | bool found = find( foundJvm );
|
---|
524 |
|
---|
525 | //check if it was found
|
---|
526 | if ( found ) {
|
---|
527 | if ( verbose ) cout << "Found JVM at '" << foundJvm.getJavaHome() << "'" << endl;
|
---|
528 | } else {
|
---|
529 | //not found - exit with -1
|
---|
530 | if ( verbose ) cout << "JVM not found" << endl;
|
---|
531 | return -1;
|
---|
532 | }
|
---|
533 |
|
---|
534 |
|
---|
535 | //Find Action
|
---|
536 | //---------------
|
---|
537 | if ( action == Find ) {
|
---|
538 |
|
---|
539 | if ( verbose ) cout << "Property to print: " << jvmPropertyToString( jvmProperty ) << endl;
|
---|
540 |
|
---|
541 | //found - print out info about it
|
---|
542 | if ( jvmProperty == JavaHome ) {
|
---|
543 | cout << foundJvm.getJavaHome() << endl;
|
---|
544 | } else if ( jvmProperty == Version ) {
|
---|
545 | cout << foundJvm.getVersion() << endl;
|
---|
546 | } else if ( jvmProperty == Executable ) {
|
---|
547 | cout << foundJvm.getExecutable() << endl;
|
---|
548 | } else {
|
---|
549 | return -1; //should never happen
|
---|
550 | }
|
---|
551 |
|
---|
552 |
|
---|
553 | //Compare Action
|
---|
554 | //---------------
|
---|
555 | } else if ( action == Compare ) {
|
---|
556 |
|
---|
557 | if ( verbose ) cout << "Compare to java at: " << arg1 << endl;
|
---|
558 |
|
---|
559 | //load a dummy jvm for comparison
|
---|
560 | Jvm givenJvm;
|
---|
561 | if ( !givenJvm.setVersionFromString(arg1) ) {
|
---|
562 | if ( verbose ) cout << "Could not parse that version string" << endl;
|
---|
563 | return -1;
|
---|
564 | }
|
---|
565 |
|
---|
566 | //compare
|
---|
567 | cout << foundJvm.compare( givenJvm );
|
---|
568 | return 0;
|
---|
569 |
|
---|
570 |
|
---|
571 | //Launch Action
|
---|
572 | //---------------
|
---|
573 | } else if ( action == Launch ) {
|
---|
574 |
|
---|
575 | if ( verbose ) cout << "Jar to launch: " << arg1 << endl;
|
---|
576 |
|
---|
577 | string cmd = "\"", output = "";
|
---|
578 | cmd.append( foundJvm.getExecutable() );
|
---|
579 | cmd.append( "\" -jar " );
|
---|
580 | cmd.append( arg1 );
|
---|
581 |
|
---|
582 | process( cmd, output );
|
---|
583 |
|
---|
584 | }
|
---|
585 |
|
---|
586 | return 0;
|
---|
587 | }
|
---|
588 |
|
---|