1 | /**********************************************************************
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2 | *
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3 | * gsdltools.cpp --
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4 | * A component of the Greenstone digital library software
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5 | * from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * Copyright (C) 1999 The New Zealand Digital Library Project
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | #include "gsdltools.h"
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27 | #include "fileutil.h"
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28 |
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29 |
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30 | #if defined(GSDL_USE_OBJECTSPACE)
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31 | # include <ospace/std/iostream>
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32 | #elif defined(GSDL_USE_IOS_H)
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33 | # include <iostream.h>
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34 | #else
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35 | # include <iostream>
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36 | using namespace std;
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37 | #endif
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38 |
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39 |
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40 | #if defined(__WIN32__)
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41 | #include <windows.h>
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42 | #include <process.h>
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43 | #endif
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44 |
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45 | #if !defined (__WIN32__)
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46 | #include <sys/utsname.h>
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47 | #include <unistd.h>
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48 | #endif
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49 |
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50 |
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51 | bool littleEndian() {
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52 | char s[2] = {'\xFE', '\xEF'};
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53 |
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54 | if (sizeof(unsigned short) == 2)
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55 | return *(unsigned short*)s == 0xEFFE;
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56 | else if (sizeof(unsigned int) == 2)
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57 | return *(unsigned int*)s == 0xEFFE;
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58 | }
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59 |
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60 | text_t dm_safe (const text_t &instring) {
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61 |
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62 | text_t outstring;
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63 | text_t::const_iterator here = instring.begin();
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64 | text_t::const_iterator end = instring.end();
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65 | while (here != end) {
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66 | if (*here == '_' || *here == '\\') outstring.push_back('\\');
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67 | outstring.push_back(*here);
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68 | ++here;
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69 | }
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70 | return outstring;
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71 | }
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72 |
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73 | void dm_js_safe(const text_t &instring, text_t &outstring)
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74 | {
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75 | text_t::const_iterator here = instring.begin();
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76 | text_t::const_iterator end = instring.end();
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77 | while (here != end) {
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78 | if (*here == '_') outstring.push_back('\\');
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79 | else if (*here == '\\' || *here == '\'') {
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80 | outstring.push_back('\\');
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81 | outstring.push_back('\\');
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82 | }
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83 | outstring.push_back(*here);
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84 | ++here;
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85 | }
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86 | }
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87 |
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88 | // gsdl_system creates a new process for the cmd command (which
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89 | // may contain arguments).
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90 | // cmd should contain the full path of the program to run.
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91 | // The child process inherits the environment of the calling
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92 | // process.
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93 | // If sync is true a synchronous call will be made, otherwise
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94 | // an asyncronous call.
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95 | // If sync is true the return value will be the exit code of
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96 | // the child process or -1 if the child process wasn't started.
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97 | // If sync is false the return value will be 0 if the process
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98 | // was started ok or -1 if it failed.
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99 | int gsdl_system (const text_t &cmd, bool sync, ostream &logout) {
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100 | if (cmd.empty()) return -1;
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101 | char *cmd_c = cmd.getcstr();
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102 |
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103 | #if defined (__WIN32__)
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104 | // the windows version - this is implemented this way
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105 | // to prevent windows popping up all over the place when
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106 | // we call a console application (like perl)
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107 | STARTUPINFO ps = {sizeof(STARTUPINFO), NULL, NULL, NULL,
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108 | 0, 0, 0, 0, 0, 0,
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109 | 0, STARTF_USESHOWWINDOW,
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110 | SW_HIDE, 0, NULL,
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111 | NULL, NULL, NULL};
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112 | PROCESS_INFORMATION pi;
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113 | BOOL res = CreateProcess(NULL,
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114 | cmd_c,
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115 | NULL,
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116 | NULL,
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117 | FALSE,
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118 | #if defined (GSDL_LOCAL_LIBRARY)
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119 | NULL,
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120 | #else
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121 | DETACHED_PROCESS,
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122 | #endif
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123 | NULL,
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124 | NULL,
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125 | &ps,
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126 | &pi);
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127 | if (!res) {
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128 | logout << "gsdl_system failed to start " << cmd_c
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129 | << " process, error code " << GetLastError();
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130 | delete []cmd_c;
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131 | return -1;
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132 | }
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133 |
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134 | DWORD ret = 0;
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135 | if (sync) { // synchronous system call
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136 | // wait until child process exits.
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137 | WaitForSingleObject(pi.hProcess, INFINITE);
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138 | // set ret to exit code of child process
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139 | GetExitCodeProcess(pi.hProcess, &ret);
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140 | }
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141 |
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142 | CloseHandle(pi.hProcess);
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143 | CloseHandle(pi.hThread);
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144 |
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145 | #else
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146 | // the unix version
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147 | int ret = 0;
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148 | if (sync) { // synchronous system call
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149 | // make sure the command interpreter is found
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150 | if (system (NULL) == 0) {
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151 | logout << "gsdl_system failed to start " << cmd_c
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152 | << " process, command interpreter not found\n";
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153 | delete []cmd_c;
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154 | return -1;
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155 | }
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156 | ret = system (cmd_c);
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157 |
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158 | } else { // asynchronous system call
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159 | int pid = fork();
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160 | if (pid == -1) {
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161 | delete []cmd_c;
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162 | return -1;
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163 | }
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164 | if (pid == 0) {
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165 | // child process
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166 | char *argv[4];
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167 | argv[0] = "sh";
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168 | argv[1] = "-c";
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169 | argv[2] = cmd_c;
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170 | argv[3] = 0;
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171 | execv("/bin/sh", argv);
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172 | }
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173 | }
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174 | #endif
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175 |
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176 | delete []cmd_c;
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177 | return ret;
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178 | }
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179 |
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180 |
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181 | static bool gsdl_setenv_done = false;
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182 | static char* retain_gsdlosc = NULL;
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183 | static char* retain_gsdlhomec = NULL;
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184 | static char* retain_pathc = NULL;
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185 |
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186 | bool set_gsdl_env_vars (const text_t& gsdlhome)
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187 | {
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188 | if (gsdl_setenv_done) { return true; }
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189 |
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190 | // set up GSDLOS, GSDLHOME and PATH environment variables
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191 |
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192 | text_t gsdlos, path;
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193 | unsigned int path_separator = ':';
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194 |
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195 | #if defined (__WIN32__)
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196 | gsdlos = "windows";
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197 | path_separator = ';';
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198 |
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199 | path = filename_cat (gsdlhome, "bin", "windows", "perl", "bin;");
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200 |
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201 | #else
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202 | struct utsname *buf = new struct utsname();
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203 | int i = uname (buf);
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204 | if (i == -1) gsdlos = "linux"; // uname failed, default to linux
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205 | else gsdlos.setcstr (buf->sysname);
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206 | delete buf;
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207 | lc (gsdlos);
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208 | #endif
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209 |
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210 | // according to getenv documentation (after a bit of digging), *getenv*
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211 | // is responsible for the char* pointer returned, so no need for us
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212 | // to free it (in fact that would be a mistake!)
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213 |
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214 | char* orig_pathc = getenv ("PATH");
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215 | path += filename_cat (gsdlhome, "bin", gsdlos);
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216 | path.push_back (path_separator);
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217 | path += filename_cat (gsdlhome, "bin", "script");
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218 | if (orig_pathc != NULL) {
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219 | path.push_back (path_separator);
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220 | path += orig_pathc;
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221 | }
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222 |
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223 | text_t putpath = "PATH=" + path;
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224 | text_t putgsdlos = "GSDLOS=" + gsdlos;
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225 | text_t putgsdlhome = "GSDLHOME=" + gsdlhome;
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226 |
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227 | retain_gsdlosc = putgsdlos.getcstr();
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228 | retain_gsdlhomec = putgsdlhome.getcstr();
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229 | retain_pathc = putpath.getcstr();
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230 |
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231 | if ((putenv(retain_gsdlosc)!=0) || (putenv(retain_gsdlhomec)!=0)
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232 | || (putenv(retain_pathc)!=0))
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233 | {
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234 | // Would be better if the ostream& logout was used here.
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235 | cerr << "Error setting Greenstone environment variables with putenv()" << endl;
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236 | // perror("putenv(...): "); // This didn't yield any noticable output under Windows running local library server
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237 | return false;
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238 | }
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239 |
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240 | // Need to keep memory allocated setgsdlosc, setgsdlhomec or pathc around
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241 | // (i.e. can't delete them). This is because putenv() doesn't take
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242 | // a copy, but places them in the actual environment.
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243 |
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244 | gsdl_setenv_done = true;
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245 |
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246 | return true;
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247 | }
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248 |
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249 |
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250 |
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251 | // attempts to work out if perl is functional
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252 | bool perl_ok (ostream &logout) {
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253 | #if defined(__WIN32__)
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254 | text_t cmd = "perl -e \"exit 0\"";
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255 | #else
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256 | text_t cmd = "perl -e 'exit 0'";
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257 | #endif
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258 | int i = gsdl_system (cmd, true, logout);
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259 | return (i == 0);
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260 | }
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