hedenface/demo.c

## demo.c
/*
1. compile with: `gcc -Wall -o demo.cgi demo.c`
2. ensure your cgi is enabled (`sudo a2enmod cgi` if using apache)
3. copy demo to your cgi-bin (possibly /usr/lib/cgi-bin/) (check your
   server configuration)
4. load page (http://localhost/cgi-bin/demo.cgi?key1=val1&key2=val2)
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char * page_title = "Basic Demonstration!";

int main(int argc, char const *argv[])
{
    char * request_method = NULL;
    char * query_string = NULL;

    /* this is the very minimum required header */
    printf("%s\r\n\r\n", "Content-type: text/html; charset=utf-8");

    printf("%s\n", "<!DOCTYPE HTML>");
    printf("%s\n", "<html>");
    printf("<head><title>%s</title></head>\n", page_title);
    printf("%s\n", "<body>");

    /*
        there are quite a few environment variables accessible, but
        we are only accessing a few. please read rfc 3875:

        https://www.ietf.org/rfc/rfc3875
    */
    request_method = getenv("REQUEST_METHOD");
    query_string = getenv("QUERY_STRING");

    printf("<h1>Request method: %s</h1>\n", request_method);

    if (query_string != NULL) {

        char * key = NULL;
        char * value = NULL;
        char * token = NULL;

        printf("<h3>Query string: %s</h3>\n", query_string);

        token = strtok(query_string, "=");

        printf("%s\n", "<table>");

        while (token != NULL) {
            printf("<tr><td>%s</td>", token);
            token = strtok(NULL, "&");
            printf("<td>%s</td></tr>\n", token);
            token = strtok(NULL, "=");
        }

        printf("%s\n", "</table>");
    }

    printf("%s\n", "</body>");
    printf("%s\n", "</html>");

    return 0;
}
	/*
	1. compile with: `gcc -Wall -o demo.cgi demo.c`
	2. ensure your cgi is enabled (`sudo a2enmod cgi` if using apache)
	3. copy demo to your cgi-bin (possibly /usr/lib/cgi-bin/) (check your
	server configuration)
	4. load page (http://localhost/cgi-bin/demo.cgi?key1=val1&key2=val2)
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	char * page_title = "Basic Demonstration!";

	int main(int argc, char const *argv[])
	{
	char * request_method = NULL;
	char * query_string = NULL;

	/* this is the very minimum required header */
	printf("%s\r\n\r\n", "Content-type: text/html; charset=utf-8");

	printf("%s\n", "<!DOCTYPE HTML>");
	printf("%s\n", "<html>");
	printf("<head><title>%s</title></head>\n", page_title);
	printf("%s\n", "<body>");

	/*
	there are quite a few environment variables accessible, but
	we are only accessing a few. please read rfc 3875:

	https://www.ietf.org/rfc/rfc3875
	*/
	request_method = getenv("REQUEST_METHOD");
	query_string = getenv("QUERY_STRING");

	printf("<h1>Request method: %s</h1>\n", request_method);

	if (query_string != NULL) {

	char * key = NULL;
	char * value = NULL;
	char * token = NULL;

	printf("<h3>Query string: %s</h3>\n", query_string);

	token = strtok(query_string, "=");

	printf("%s\n", "<table>");

	while (token != NULL) {
	printf("<tr><td>%s</td>", token);
	token = strtok(NULL, "&");
	printf("<td>%s</td></tr>\n", token);
	token = strtok(NULL, "=");
	}

	printf("%s\n", "</table>");
	}

	printf("%s\n", "</body>");
	printf("%s\n", "</html>");

	return 0;
	}