release/src/router/httpd/cgi.c

   1 /*
   2  * CGI helper functions
   3  *
   4  * Copyright 2005, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id: cgi.c,v 1.10 2005/03/07 08:35:32 kanki Exp $
  13  */
  14
  15 #include "tomato.h"
  16
  17 #define __USE_GNU
  18 #include <search.h>
  19
  20
  21 /* CGI hash table */
  22 static struct hsearch_data htab = { .table = NULL };
  23
  24 static void unescape(char *s)
  25 {
  26         unsigned int c;
  27
  28         while ((s = strpbrk(s, "%+"))) {
  29                 if (*s == '%') {
  30                         sscanf(s + 1, "%02x", &c);
  31                         *s++ = (char) c;
  32                         strcpy(s, s + 2);
  33                 }
  34                 else if (*s == '+') {
  35                         *s++ = ' ';
  36                 }
  37         }
  38 }
  39
  40 char *webcgi_get(const char *name)
  41 {
  42         ENTRY e, *ep;
  43
  44         if (!htab.table) return NULL;
  45
  46         e.key = (char *)name;
  47         hsearch_r(e, FIND, &ep, &htab);
  48
  49 //      cprintf("%s=%s\n", name, ep ? ep->data : "(null)");
  50
  51         return ep ? ep->data : NULL;
  52 }
  53
  54 void webcgi_set(char *name, char *value)
  55 {
  56         ENTRY e, *ep;
  57
  58         if (!htab.table) {
  59                 hcreate_r(16, &htab);
  60         }
  61
  62         e.key = name;
  63         hsearch_r(e, FIND, &ep, &htab);
  64         if (ep) {
  65                 ep->data = value;
  66         }
  67         else {
  68                 e.data = value;
  69                 hsearch_r(e, ENTER, &ep, &htab);
  70         }
  71 }
  72
  73 void webcgi_init(char *query)
  74 {
  75         int nel;
  76         char *q, *end, *name, *value;
  77
  78         if (htab.table) hdestroy_r(&htab);
  79         if (query == NULL) return;
  80
  81 //      cprintf("query = %s\n", query);
  82
  83         end = query + strlen(query);
  84         q = query;
  85         nel = 1;
  86         while (strsep(&q, "&;")) {
  87                 nel++;
  88         }
  89         hcreate_r(nel, &htab);
  90
  91         for (q = query; q < end; ) {
  92                 value = q;
  93                 q += strlen(q) + 1;
  94
  95                 unescape(value);
  96                 name = strsep(&value, "=");
  97                 if (value) webcgi_set(name, value);
  98         }
  99 }