1 | /**
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2 | * @file
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3 | * HTTPD simple CGI example
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4 | *
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5 | * This file demonstrates how to add support for basic CGI.
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6 | */
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7 |
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8 | /*
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9 | * Copyright (c) 2017 Simon Goldschmidt
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10 | * All rights reserved.
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11 | *
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12 | * Redistribution and use in source and binary forms, with or without modification,
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13 | * are permitted provided that the following conditions are met:
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14 | *
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15 | * 1. Redistributions of source code must retain the above copyright notice,
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16 | * this list of conditions and the following disclaimer.
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17 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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18 | * this list of conditions and the following disclaimer in the documentation
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19 | * and/or other materials provided with the distribution.
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20 | * 3. The name of the author may not be used to endorse or promote products
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21 | * derived from this software without specific prior written permission.
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22 | *
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23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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32 | * OF SUCH DAMAGE.
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33 | *
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34 | * This file is part of the lwIP TCP/IP stack.
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35 | *
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36 | * Author: Simon Goldschmidt <goldsimon@gmx.de>
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37 | *
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38 | */
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39 |
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40 | #include "lwip/opt.h"
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41 | #include "cgi_example.h"
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42 |
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43 | #include "lwip/apps/httpd.h"
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44 |
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45 | #include "lwip/def.h"
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46 | #include "lwip/mem.h"
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47 |
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48 | #include <stdio.h>
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49 | #include <string.h>
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50 |
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51 | /** define LWIP_HTTPD_EXAMPLE_CGI_SIMPLE to 1 to enable this cgi example */
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52 | #ifndef LWIP_HTTPD_EXAMPLE_CGI_SIMPLE
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53 | #define LWIP_HTTPD_EXAMPLE_CGI_SIMPLE 0
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54 | #endif
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55 |
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56 | #if LWIP_HTTPD_EXAMPLE_CGI_SIMPLE
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57 |
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58 | #if !LWIP_HTTPD_CGI
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59 | #error LWIP_HTTPD_EXAMPLE_CGI_SIMPLE needs LWIP_HTTPD_CGI
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60 | #endif
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61 |
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62 | static const char *cgi_handler_basic(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
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63 |
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64 | static const tCGI cgi_handlers[] = {
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65 | {
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66 | "/basic_cgi",
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67 | cgi_handler_basic
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68 | },
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69 | {
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70 | "/basic_cgi_2",
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71 | cgi_handler_basic
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72 | }
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73 | };
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74 |
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75 | void
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76 | cgi_ex_init(void)
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77 | {
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78 | http_set_cgi_handlers(cgi_handlers, LWIP_ARRAYSIZE(cgi_handlers));
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79 | }
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80 |
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81 | /** This basic CGI function can parse param/value pairs and return an url that
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82 | * is sent as a response by httpd.
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83 | *
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84 | * This example function just checks that the input url has two key value
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85 | * parameter pairs: "foo=bar" and "test=123"
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86 | * If not, it returns 404
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87 | */
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88 | static const char *
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89 | cgi_handler_basic(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
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90 | {
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91 | LWIP_ASSERT("check index", iIndex < LWIP_ARRAYSIZE(cgi_handlers));
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92 |
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93 | if (iNumParams == 2) {
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94 | if (!strcmp(pcParam[0], "foo")) {
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95 | if (!strcmp(pcValue[0], "bar")) {
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96 | if (!strcmp(pcParam[1], "test")) {
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97 | if (!strcmp(pcValue[1], "123")) {
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98 | return "/index.html";
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99 | }
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100 | }
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101 | }
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102 | }
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103 | }
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104 | return "/404.html";
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105 | }
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106 |
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107 | #endif /* LWIP_HTTPD_EXAMPLE_CGI_SIMPLE */
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