source/web/cgi.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    some simple CGI helper routines
   5    Copyright (C) Andrew Tridgell 1997
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22
  23 #include "includes.h"
  24
  25 #define MAX_VARIABLES 512
  26
  27 struct var {
  28         char *name;
  29         char *value;
  30 };
  31
  32 static struct var variables[MAX_VARIABLES];
  33 static int num_variables;
  34
  35
  36 static int grab_line(int *cl, char *line, int maxsize)
  37 {
  38         int i = 0;
  39
  40         while ((*cl)) {
  41                 int c = fgetc(stdin);
  42                 (*cl)--;
  43
  44                 if (c == EOF) {
  45                         (*cl) = 0;
  46                         break;
  47                 }
  48
  49                 if (c == '+') {
  50                         c = ' ';
  51                 }
  52
  53                 if (c == '\r') continue;
  54
  55                 if (strchr("\n&", c)) break;
  56
  57                 if (c == '%' && (*cl) >= 2) {
  58                         int c1, c2;
  59                         c1 = fgetc(stdin);
  60                         c2 = fgetc(stdin);
  61                         (*cl) -= 2;
  62                         if (c1 == EOF || c2 == EOF) break;
  63                         if (c1 >= '0' && c1 <= '9')
  64                                 c1 = c1 - '0';
  65                         else if (c1 >= 'A' && c1 <= 'F')
  66                                 c1 = 10 + c1 - 'A';
  67                         else if (c1 >= 'a' && c1 <= 'f')
  68                                 c1 = 10 + c1 - 'a';
  69                         else break;
  70
  71                         if (c2 >= '0' && c2 <= '9')
  72                                 c2 = c2 - '0';
  73                         else if (c2 >= 'A' && c2 <= 'F')
  74                                 c2 = 10 + c2 - 'A';
  75                         else if (c2 >= 'a' && c2 <= 'f')
  76                                 c2 = 10 + c2 - 'a';
  77                         else break;
  78
  79                         c = (c1<<4) | c2;
  80                 }
  81
  82                 line[i++] = c;
  83
  84                 if (i == maxsize) break;
  85         }
  86
  87         /* now unescape the line */
  88
  89
  90         line[i] = 0;
  91         return 1;
  92 }
  93
  94
  95 /***************************************************************************
  96   load all the variables passed to the CGI program
  97   ***************************************************************************/
  98 void cgi_load_variables(void)
  99 {
 100         static pstring line;
 101         char *p;
 102         int len;
 103
 104         if (!(p=getenv("CONTENT_LENGTH"))) return;
 105
 106         len = atoi(p);
 107
 108         if (len <= 0) return;
 109
 110
 111
 112         while (len && grab_line(&len, line, sizeof(line)-1)) {
 113                 p = strchr(line,'=');
 114                 if (!p) continue;
 115
 116                 *p = 0;
 117
 118                 variables[num_variables].name = strdup(line);
 119                 variables[num_variables].value = strdup(p+1);
 120
 121                 if (!variables[num_variables].name ||
 122                     !variables[num_variables].value)
 123                         continue;
 124
 125 #if 0
 126                 printf("%s=%s<br>\n",
 127                        variables[num_variables].name,
 128                        variables[num_variables].value);
 129 #endif
 130
 131                 num_variables++;
 132                 if (num_variables == MAX_VARIABLES) break;
 133         }
 134
 135         fclose(stdin);
 136 }
 137
 138
 139 /***************************************************************************
 140   find a variable passed via CGI
 141   ***************************************************************************/
 142 char *cgi_variable(char *name)
 143 {
 144         int i;
 145
 146         for (i=0;i<num_variables;i++)
 147                 if (strcmp(variables[i].name, name) == 0)
 148                         return variables[i].value;
 149         return NULL;
 150 }
 151
 152
 153 /***************************************************************************
 154   return the value of a CGI boolean variable.
 155   ***************************************************************************/
 156 int cgi_boolean(char *name, int def)
 157 {
 158         char *p = cgi_variable(name);
 159
 160         if (!p) return def;
 161
 162         return strcmp(p, "1") == 0;
 163 }