How to set and read cookies using C and the G-wan web server

In php you would set a cookie by doing

Setting new cookie ============================= <?php setcookie("name","value",time()+$int); /*name is your cookie's name value is cookie's value $int is time of cookie expires*/ ?> Getting Cookie ============================= <?php echo $_COOKIE["your cookie name"]; ?>

How do you set and read cookie?

I can't seem to find any articles on the web explaining hoe to do this. In fact there is not many c web development article

-------------Problems Reply------------

The G-WAN tar ball includes 2 sample source code files related to cookies: cookie.c (set a cookie)

#include "gwan.h" // G-WAN exported functions

int main(int argc, char *argv[])
{
// "Set-Cookie: Domain=.foo.com; Path=/; Max-Age=%u\r\n"
const char cookie[] = "Set-Cookie: Max-Age=3600\r\n" // 1 hour
"Location: /?served_from\r\n\r\nblah\r\n";
http_header(HEAD_ADD, (char*)cookie, sizeof(cookie) - 1, argv);

return 301; // return an HTTP code (301:'Moved')
}

and cookies.c (read cookies)

#include "gwan.h"
#include <stdio.h>
#include <string.h>

// ----------------------------------------------------------------------------
// where 'cookies' = "key1=value1; key2=value2;"
// ----------------------------------------------------------------------------
static kv_t parse_cookies(char *cookies)
{
kv_t cookies_store;
kv_init(&cookies_store, "cookies", 1024, 0, 0, 0);

char *key, *val, *lasts = 0;
for(;;)
{
key = strtok_r(cookies, "= ", &lasts);
val = strtok_r(0, ";,", &lasts);

if(!val) break; //no more cookies

kv_add(&cookies_store,
&(kv_item){
.key = key,
.val = val,
.flags = 0,
});

cookies = 0;
}
return cookies_store;
}
// ----------------------------------------------------------------------------
int main(int argc, char *argv[])
{
// using the client cookies (make sure that they are there)
// http_t *http = get_env(argv, HTTP_HEADERS, 0);
// kv_t cookies_store = parse_cookies(http->h_cookies);

// using fixed cookies (for tests without client cookies)
char cookies[] = "key=val;foo=bar";
kv_t cookies_store = parse_cookies(cookies);

char *val = kv_get(&cookies_store, "key", sizeof("key") - 1);

printf("%s = %s\n", "key", val);

kv_free(&cookies_store);
return 200;
}

Cookie are set like any other HTTP header : http://en.wikipedia.org/wiki/List_of_HTTP_header_fields#innerlink_set-cookie

You can find sample code in the gwan archive, here : gwan_linux64-bit/0.0.0.0_8080/#0.0.0.0/csp

Category:php Views:1 Time:2018-11-05
Tags: php g wan

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