[108] | 1 | /**********************************************************************
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| 2 | *
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| 3 | * cgiutils.cpp -- general cgi utilities
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| 4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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| 5 | *
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[533] | 6 | * A component of the Greenstone digital library software
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| 7 | * from the New Zealand Digital Library Project at the
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| 8 | * University of Waikato, New Zealand.
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[108] | 9 | *
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[533] | 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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[108] | 24 | *********************************************************************/
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| 25 |
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| 26 | #include "cgiutils.h"
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| 27 |
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| 28 |
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| 29 | static unsigned short hexdigit (unsigned short c) {
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| 30 | if (c >= '0' && c <= '9') return (c-'0');
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| 31 | if (c >= 'a' && c <= 'f') return (c-'a'+10);
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| 32 | if (c >= 'A' && c <= 'F') return (c-'A'+10);
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| 33 | return c;
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| 34 | }
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| 35 |
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| 36 |
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| 37 | static void c2hex (unsigned short c, text_t &t) {
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| 38 | t.clear();
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| 39 |
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| 40 | if (c >= 256) {
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| 41 | t = "20"; // ' '
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| 42 | return;
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| 43 | }
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| 44 |
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| 45 | unsigned short o1, o2;
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| 46 |
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| 47 | o1 = (c/16) % 16;
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| 48 | o2 = c % 16;
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| 49 | if (o1 >= 10) o1 += 'a' - 10;
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| 50 | else o1 += '0';
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| 51 | if (o2 >= 10) o2 += 'a' - 10;
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| 52 | else o2 += '0';
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| 53 |
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| 54 | t.push_back(o1);
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| 55 | t.push_back(o2);
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| 56 | }
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| 57 |
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| 58 | // convert %xx and + to their appropriate equivalents
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| 59 | void decode_cgi_arg (text_t &argstr) {
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| 60 | text_t::iterator in = argstr.begin();
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| 61 | text_t::iterator out = in;
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| 62 | text_t::iterator end = argstr.end();
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| 63 |
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| 64 | while (in != end) {
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| 65 | if (*in == '+') *out = ' ';
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| 66 |
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| 67 | else if (*in == '%') {
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| 68 | unsigned short c = '%';
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| 69 | in++;
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| 70 | if (in != end) {
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| 71 | c = hexdigit (*in);
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| 72 | in++;
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| 73 | }
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| 74 | if (in != end && c < 16) { // sanity check on the previous character
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| 75 | c = c*16 + hexdigit (*in);
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| 76 | }
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| 77 |
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| 78 | *out = c;
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| 79 | } else *out = *in;
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| 80 |
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| 81 | if (in != end) in++;
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| 82 | out++;
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| 83 | }
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| 84 |
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| 85 | // remove the excess characters
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| 86 | argstr.erase (out, end);
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| 87 | }
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| 88 |
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| 89 |
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| 90 | // split up the cgi arguments
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[776] | 91 | void split_cgi_args (const cgiargsinfoclass &argsinfo, text_t argstr,
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| 92 | cgiargsclass &args) {
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[108] | 93 | args.clear();
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| 94 |
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| 95 | text_t::iterator here = argstr.begin();
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| 96 | text_t::iterator end = argstr.end();
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| 97 | text_t key, value;
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| 98 |
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| 99 | // extract out the key=value pairs
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| 100 | while (here != end) {
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| 101 | // get the next key and value pair
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| 102 | here = getdelimitstr (here, end, '=', key);
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| 103 | here = getdelimitstr (here, end, '&', value);
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| 104 |
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| 105 | // convert %xx and + to their appropriate equivalents
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[614] | 106 | decode_cgi_arg (value);
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[607] | 107 |
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[108] | 108 | value.setencoding(1); // other encoding
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| 109 | // store this key=value pair
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[764] | 110 | if (!key.empty()) {
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| 111 | // if arg occurs multiple times (as is the case with
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| 112 | // multiple checkboxes using the same name) we'll
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| 113 | // create a comma separated list of all the values
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[776] | 114 | // (if multiplevalue)
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| 115 | if (!args[key].empty()) {
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| 116 | const cgiarginfo *info = argsinfo.getarginfo (key);
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| 117 | if (info != NULL && info->multiplevalue)
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| 118 | args[key] += "," + value;
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| 119 | else args.setarg (key, value, cgiarg_t::cgi_arg);
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| 120 | } else
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[764] | 121 | args.setarg (key, value, cgiarg_t::cgi_arg);
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| 122 | }
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[108] | 123 | }
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| 124 | }
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| 125 |
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[607] | 126 | text_t minus_safe (const text_t &intext) {
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| 127 |
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| 128 | text_t outtext;
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| 129 |
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| 130 | text_t::const_iterator here = intext.begin ();
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| 131 | text_t::const_iterator end = intext.end ();
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| 132 |
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| 133 | while (here != end) {
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[1504] | 134 | if (*here == '-') outtext += "Zz-";
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[607] | 135 | else outtext.push_back (*here);
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| 136 | here ++;
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| 137 | }
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[614] | 138 | outtext = cgi_safe (outtext);
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[607] | 139 | return outtext;
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| 140 | }
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| 141 |
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[108] | 142 | text_t cgi_safe (const text_t &intext) {
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| 143 | text_t outtext;
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| 144 |
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| 145 | text_t::const_iterator here = intext.begin ();
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| 146 | text_t::const_iterator end = intext.end ();
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| 147 | unsigned short c;
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| 148 | text_t ttmp;
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| 149 |
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| 150 | while (here != end) {
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| 151 | c = *here;
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| 152 | if (((c >= 'a') && (c <= 'z')) ||
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| 153 | ((c >= 'A') && (c <= 'Z')) ||
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[474] | 154 | ((c >= '0') && (c <= '9')) ||
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[614] | 155 | (c == '+') || (c == '%') || (c == '-')) {
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[108] | 156 | // alphanumeric character
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| 157 | outtext.push_back(c);
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| 158 | } else if (c == ' ') {
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| 159 | // space
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[150] | 160 | outtext.push_back('+');
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[108] | 161 | } else {
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| 162 | // everything else
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| 163 | outtext.push_back('%');
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| 164 | c2hex(c, ttmp);
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| 165 | outtext += ttmp;
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| 166 | }
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| 167 |
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| 168 | here++;
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| 169 | }
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| 170 |
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| 171 | return outtext;
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| 172 | }
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[155] | 173 |
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| 174 |
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| 175 |
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| 176 |
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| 177 | static text_t::const_iterator get_next_save_arg (text_t::const_iterator first,
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| 178 | text_t::const_iterator last,
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| 179 | text_t &argname) {
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| 180 | first = getdelimitstr (first, last, '-', argname);
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| 181 | return first;
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| 182 | }
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| 183 |
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| 184 |
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| 185 | // check_save_conf_str checks the configuration string for
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| 186 | // the saved args and makes sure it does not conflict with
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| 187 | // the information about the arguments. If an error is encountered
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| 188 | // it will return false and the program should not produce any
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| 189 | // output.
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| 190 | bool check_save_conf_str (const text_t &saveconf,
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| 191 | const cgiargsinfoclass &argsinfo,
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| 192 | ostream &logout) {
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| 193 | outconvertclass text_t2ascii;
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| 194 |
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| 195 | text_tset argsset;
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| 196 | text_t::const_iterator saveconfhere = saveconf.begin ();
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| 197 | text_t::const_iterator saveconfend = saveconf.end ();
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| 198 | text_t argname;
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| 199 | const cgiarginfo *info;
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| 200 |
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| 201 | // first check to make sure all saved arguments can be saved
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| 202 |
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| 203 | while (saveconfhere != saveconfend) {
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| 204 | saveconfhere = get_next_save_arg (saveconfhere, saveconfend, argname);
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| 205 |
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| 206 | if (!argname.empty()) {
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| 207 | // save the argument name for later
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| 208 | argsset.insert (argname);
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| 209 |
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| 210 | // check the argument
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| 211 | info = argsinfo.getarginfo (argname);
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| 212 | if (info == NULL) {
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| 213 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 214 | << "\" is used in the configuration string for the\n"
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| 215 | << "saved arguments but does not exist as a valid argument.\n\n";
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| 216 | return false;
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| 217 | }
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| 218 | if (info->savedarginfo == cgiarginfo::mustnot) {
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| 219 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 220 | << "\" is used in the configuration string for the\n"
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| 221 | << "saved arguments but has been specified as an argument whose\n"
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| 222 | << "state must not be saved.\n\n";
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| 223 | return 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 | // next check that all saved arguments that should be saved
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| 230 | // are saved
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| 231 | cgiargsinfoclass::const_iterator argsinfohere = argsinfo.begin ();
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| 232 | cgiargsinfoclass::const_iterator argsinfoend = argsinfo.end ();
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| 233 |
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| 234 | while (argsinfohere != argsinfoend) {
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| 235 | if (((*argsinfohere).second.savedarginfo == cgiarginfo::must) &&
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| 236 | (argsset.find((*argsinfohere).second.shortname) == argsset.end())) {
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| 237 | logout << text_t2ascii << "Error: the cgi argument \""
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| 238 | << (*argsinfohere).second.shortname << "\" was specified as needing to\n"
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| 239 | << "be save but was not listed in the saved arguments.\n\n";
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| 240 | return false;
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| 241 | }
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| 242 |
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| 243 | argsinfohere++;
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| 244 | }
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| 245 |
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| 246 | return true; // made it, no clashes
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| 247 | }
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| 248 |
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| 249 |
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| 250 | // create_save_conf_str will create a configuration string
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| 251 | // based on the information in argsinfo. This method of configuration
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| 252 | // is not recomended as small changes can produce large changes in
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| 253 | // the resulting configuration string (for instance a totally different
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| 254 | // ordering). Only arguments which "must" be saved are included in
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| 255 | // the resulting string.
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| 256 | text_t create_save_conf_str (const cgiargsinfoclass &argsinfo,
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| 257 | ostream &/*logout*/) {
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| 258 | cgiargsinfoclass::const_iterator argsinfohere = argsinfo.begin ();
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| 259 | cgiargsinfoclass::const_iterator argsinfoend = argsinfo.end ();
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| 260 | text_t saveconf;
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| 261 | bool first = true;
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| 262 |
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| 263 | while (argsinfohere != argsinfoend) {
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| 264 | // save this argument if it must be saved
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| 265 | if ((*argsinfohere).second.savedarginfo == cgiarginfo::must) {
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| 266 | if (!first) saveconf.push_back ('-');
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| 267 | else first = false;
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| 268 | saveconf += (*argsinfohere).second.shortname;
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| 269 | }
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| 270 |
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| 271 | argsinfohere++;
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| 272 | }
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| 273 |
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| 274 | return saveconf;
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| 275 | }
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| 276 |
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| 277 |
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| 278 | // expand_save_args will expand the saved arguments based
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| 279 | // on saveconf placing the results in args if they are not
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| 280 | // already defined. If it encounters an error it will return false
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| 281 | // and output more information to logout.
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| 282 | bool expand_save_args (const cgiargsinfoclass &argsinfo,
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| 283 | const text_t &saveconf,
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| 284 | cgiargsclass &args,
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| 285 | ostream &logout) {
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| 286 | outconvertclass text_t2ascii;
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| 287 |
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| 288 | text_t *arg_e = args.getarg("e");
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| 289 | if (arg_e == NULL) return true; // no compressed arguments
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| 290 | if (arg_e->empty()) return true; // no compressed arguments
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| 291 |
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| 292 | text_t argname, argvalue;
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| 293 | const cgiarginfo *argnameinfo;
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| 294 |
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| 295 | text_t::const_iterator saveconfhere = saveconf.begin();
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| 296 | text_t::const_iterator saveconfend = saveconf.end();
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| 297 |
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| 298 | text_t::iterator arg_ehere = arg_e->begin();
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| 299 | text_t::iterator arg_eend = arg_e->end();
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| 300 | while (saveconfhere != saveconfend && arg_ehere != arg_eend) {
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| 301 | saveconfhere = get_next_save_arg (saveconfhere, saveconfend, argname);
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| 302 |
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| 303 | if (!argname.empty()) {
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| 304 | // found another entry
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| 305 | argnameinfo = argsinfo.getarginfo (argname);
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| 306 |
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| 307 | if (argnameinfo == NULL) {
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| 308 | // no information about the argument could be found
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| 309 | // we can't keep going because we don't know whether
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| 310 | // this argument is a single or multiple character value
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| 311 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 312 | << "\" was specified as being a compressed argument\n"
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| 313 | << "but no information about it could be found within the "
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| 314 | << "cgiargsinfoclass.\n";
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| 315 | return false;
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| 316 |
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| 317 | } else {
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[294] | 318 |
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[155] | 319 | // found the argument information
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| 320 | if (argnameinfo->multiplechar) {
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[607] | 321 | text_t::const_iterator sav = arg_ehere;
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[155] | 322 | arg_ehere = getdelimitstr (arg_ehere, arg_eend, '-', argvalue);
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[1504] | 323 | // replace any '-' chars escaped with 'Zz'
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[1422] | 324 | bool first = true;
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[1504] | 325 | while ((*(arg_ehere-3) == 'Z') && (*(arg_ehere-2) == 'z')) {
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[1422] | 326 | if (first) argvalue.clear();
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[607] | 327 | arg_ehere = (findchar (arg_ehere, arg_eend, '-')) + 1;
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| 328 | while (sav != (arg_ehere-1)) {
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[1504] | 329 | if (!((*sav == 'Z') && (*(sav+1) == 'z') && (*(sav+2) == '-')) &&
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| 330 | !((*(sav-1) == 'Z') && (*sav == 'z') && (*(sav+1) == '-'))) argvalue.push_back (*sav);
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[607] | 331 | sav ++;
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| 332 | }
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[1422] | 333 | first = false;
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[607] | 334 | }
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| 335 |
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[294] | 336 | argvalue.setencoding(1); // other encoding
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[366] | 337 | if (!argvalue.empty()) args.setdefaultarg (argname, argvalue, cgiarg_t::compressed_arg);
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[155] | 338 | } else {
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[366] | 339 | args.setdefaultcarg (argname,*arg_ehere, cgiarg_t::compressed_arg);
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[155] | 340 | arg_ehere++;
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| 341 | }
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| 342 | }
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| 343 | }
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| 344 | }
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| 345 |
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| 346 | return true;
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| 347 | }
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| 348 |
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| 349 |
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| 350 | // adds the default values for those arguments which have not
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| 351 | // been specified
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| 352 | void add_default_args (const cgiargsinfoclass &argsinfo,
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| 353 | cgiargsclass &args,
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| 354 | ostream &/*logout*/) {
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| 355 | cgiargsinfoclass::const_iterator argsinfohere = argsinfo.begin ();
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| 356 | cgiargsinfoclass::const_iterator argsinfoend = argsinfo.end ();
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| 357 |
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| 358 | while (argsinfohere != argsinfoend) {
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| 359 | if ((*argsinfohere).second.defaultstatus != cgiarginfo::none) {
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| 360 | args.setdefaultarg ((*argsinfohere).second.shortname,
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[366] | 361 | (*argsinfohere).second.argdefault, cgiarg_t::default_arg);
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[155] | 362 | }
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| 363 | argsinfohere++;
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| 364 | }
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| 365 | }
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| 366 |
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| 367 |
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| 368 | // compress_save_args will compress the arguments and return
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| 369 | // them in compressed_args. If an error was encountered
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| 370 | // compressed_args will be set to to "", an error will be
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| 371 | // written to logout, and the function will return false.
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| 372 | bool compress_save_args (const cgiargsinfoclass &argsinfo,
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| 373 | const text_t &saveconf,
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| 374 | cgiargsclass &args,
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| 375 | text_t &compressed_args,
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[294] | 376 | outconvertclass &outconvert,
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[155] | 377 | ostream &logout) {
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| 378 | outconvertclass text_t2ascii;
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| 379 |
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| 380 | compressed_args.clear();
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| 381 |
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| 382 | text_t argname, argvalue;
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| 383 | const cgiarginfo *argnameinfo;
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| 384 |
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| 385 | text_t::const_iterator saveconfhere = saveconf.begin();
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| 386 | text_t::const_iterator saveconfend = saveconf.end();
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| 387 |
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| 388 | while (saveconfhere != saveconfend) {
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| 389 | saveconfhere = get_next_save_arg (saveconfhere, saveconfend, argname);
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| 390 |
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| 391 | if (!argname.empty()) {
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| 392 | // found another entry
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| 393 | argnameinfo = argsinfo.getarginfo (argname);
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| 394 |
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| 395 | if (argnameinfo == NULL) {
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| 396 | // no information about the argument could be found
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| 397 | // we can't keep going because we don't know whether
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| 398 | // this argument is a single or multiple character value
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| 399 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 400 | << "\" was specified as being a compressed argument\n"
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| 401 | << "but no information about it could be found within the "
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| 402 | << "cgiargsinfoclass.\n";
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| 403 | compressed_args.clear();
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| 404 | return false;
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| 405 |
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| 406 | } else {
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| 407 | // found the argument information
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| 408 | if (argnameinfo->multiplechar) {
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[607] | 409 | // multiple character argument -- sort out any '-' chars
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| 410 | compressed_args += minus_safe (outconvert.convert(args[argname]));
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[155] | 411 | if (saveconfhere != saveconfend) compressed_args.push_back ('-');
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| 412 |
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| 413 | } else {
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| 414 | // single character argument
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| 415 | if (args[argname].size() == 0) {
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| 416 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 417 | << "\" was specified as being a compressed argument which\n"
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| 418 | << "should have a one character value but it was empty.\n\n";
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| 419 | compressed_args.clear ();
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| 420 | return false;
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| 421 |
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| 422 | } else if (args[argname].size() > 1) {
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| 423 | logout << text_t2ascii << "Error: the cgi argument \"" << argname
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| 424 | << "\" was specified as being a compressed argument which\n"
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| 425 | << "should have a one character value but it had multiple characters.\n\n";
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| 426 | compressed_args.clear ();
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| 427 | return false;
|
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| 428 | }
|
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| 429 |
|
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| 430 | // everything is ok
|
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| 431 | compressed_args += args[argname];
|
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| 432 | }
|
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| 433 | }
|
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| 434 | }
|
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| 435 | }
|
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| 436 |
|
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| 437 | return true;
|
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| 438 | }
|
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| 439 |
|
---|
| 440 |
|
---|
| 441 | // args_tounicode converts any arguments which are not in unicode
|
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| 442 | // to unicode using inconvert
|
---|
| 443 | void args_tounicode (cgiargsclass &args, inconvertclass &inconvert) {
|
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| 444 | cgiargsclass::iterator here = args.begin();
|
---|
| 445 | cgiargsclass::iterator end = args.end();
|
---|
| 446 |
|
---|
| 447 | while (here != end) {
|
---|
[366] | 448 | if ((*here).second.value.getencoding() > 0) {
|
---|
| 449 | (*here).second.value = inconvert.convert((*here).second.value);
|
---|
[155] | 450 | }
|
---|
| 451 |
|
---|
| 452 | here++;
|
---|
| 453 | }
|
---|
| 454 | }
|
---|
[873] | 455 |
|
---|
| 456 | // fcgienv will be loaded with environment name-value pairs
|
---|
| 457 | // if using fastcgi (had to do this as getenv doesn't work
|
---|
| 458 | // with our implementation of fastcgi). if fcgienv is empty
|
---|
| 459 | // we'll simply use getenv
|
---|
| 460 | text_t gsdl_getenv (const text_t &name, text_tmap &fcgienv) {
|
---|
| 461 | if (fcgienv.empty()) {
|
---|
| 462 | char *n = name.getcstr();
|
---|
| 463 | char *v = getenv(n);
|
---|
| 464 | delete n;
|
---|
| 465 | if (v != NULL) return v;
|
---|
| 466 | return "";
|
---|
| 467 |
|
---|
| 468 | } else return fcgienv[name];
|
---|
| 469 | }
|
---|