mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
196 lines
5.2 KiB
C
196 lines
5.2 KiB
C
/*
|
|
* lws-minimal-http-server-dynamic
|
|
*
|
|
* Copyright (C) 2018 Andy Green <andy@warmcat.com>
|
|
*
|
|
* This file is made available under the Creative Commons CC0 1.0
|
|
* Universal Public Domain Dedication.
|
|
*
|
|
* This demonstrates a minimal http server that can produce dynamic http
|
|
* content as well as static content.
|
|
*
|
|
* To keep it simple, it serves the static stuff from the subdirectory
|
|
* "./mount-origin" of the directory it was started in.
|
|
*
|
|
* You can change that by changing mount.origin below.
|
|
*/
|
|
|
|
#include <libwebsockets.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <time.h>
|
|
|
|
/*
|
|
* Unlike ws, http is a stateless protocol. This pss only exists for the
|
|
* duration of a single http transaction. With http/1.1 keep-alive and http/2,
|
|
* that is unrelated to (shorter than) the lifetime of the network connection.
|
|
*/
|
|
struct pss {
|
|
char str[128];
|
|
int len;
|
|
};
|
|
|
|
static int interrupted;
|
|
|
|
static int
|
|
callback_dynamic_http(struct lws *wsi, enum lws_callback_reasons reason,
|
|
void *user, void *in, size_t len)
|
|
{
|
|
struct pss *pss = (struct pss *)user;
|
|
uint8_t buf[LWS_PRE + 256], *start = &buf[LWS_PRE], *p = start,
|
|
*end = &buf[sizeof(buf) - 1];
|
|
time_t t;
|
|
|
|
switch (reason) {
|
|
case LWS_CALLBACK_HTTP:
|
|
|
|
/* in contains the url part after our mountpoint /dyn, if any */
|
|
|
|
t = time(NULL);
|
|
pss->len = lws_snprintf(pss->str, sizeof(pss->str),
|
|
"<html>"
|
|
"<img src=\"/libwebsockets.org-logo.png\">"
|
|
"<br>Dynamic content for '%s' from mountpoint."
|
|
"<br>Time: %s"
|
|
"</html>", (const char *)in, ctime(&t));
|
|
|
|
/* prepare and write http headers */
|
|
if (lws_add_http_common_headers(wsi, HTTP_STATUS_OK,
|
|
"text/html", pss->len, &p, end))
|
|
return 1;
|
|
if (lws_finalize_write_http_header(wsi, start, &p, end))
|
|
return 1;
|
|
|
|
/* write the body separately */
|
|
lws_callback_on_writable(wsi);
|
|
|
|
return 0;
|
|
|
|
case LWS_CALLBACK_HTTP_WRITEABLE:
|
|
|
|
if (!pss || !pss->len)
|
|
break;
|
|
|
|
/*
|
|
* Use LWS_WRITE_HTTP for intermediate writes, on http/2
|
|
* lws uses this to understand to end the stream with this
|
|
* frame
|
|
*/
|
|
if (lws_write(wsi, (uint8_t *)pss->str, pss->len,
|
|
LWS_WRITE_HTTP_FINAL) != pss->len)
|
|
return 1;
|
|
|
|
/*
|
|
* HTTP/1.0 no keepalive: close network connection
|
|
* HTTP/1.1 or HTTP1.0 + KA: wait / process next transaction
|
|
* HTTP/2: stream ended, parent connection remains up
|
|
*/
|
|
if (lws_http_transaction_completed(wsi))
|
|
return -1;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return lws_callback_http_dummy(wsi, reason, user, in, len);
|
|
}
|
|
|
|
static struct lws_protocols protocols[] = {
|
|
{ "http", callback_dynamic_http, sizeof(struct pss), 0 },
|
|
{ NULL, NULL, 0, 0 } /* terminator */
|
|
};
|
|
|
|
/* override the default mount for /dyn in the URL space */
|
|
|
|
static const struct lws_http_mount mount_dyn = {
|
|
/* .mount_next */ NULL, /* linked-list "next" */
|
|
/* .mountpoint */ "/dyn", /* mountpoint URL */
|
|
/* .origin */ NULL, /* protocol */
|
|
/* .def */ NULL,
|
|
/* .protocol */ "http",
|
|
/* .cgienv */ NULL,
|
|
/* .extra_mimetypes */ NULL,
|
|
/* .interpret */ NULL,
|
|
/* .cgi_timeout */ 0,
|
|
/* .cache_max_age */ 0,
|
|
/* .auth_mask */ 0,
|
|
/* .cache_reusable */ 0,
|
|
/* .cache_revalidate */ 0,
|
|
/* .cache_intermediaries */ 0,
|
|
/* .origin_protocol */ LWSMPRO_CALLBACK, /* dynamic */
|
|
/* .mountpoint_len */ 4, /* char count */
|
|
/* .basic_auth_login_file */ NULL,
|
|
};
|
|
|
|
/* default mount serves the URL space from ./mount-origin */
|
|
|
|
static const struct lws_http_mount mount = {
|
|
/* .mount_next */ &mount_dyn, /* linked-list "next" */
|
|
/* .mountpoint */ "/", /* mountpoint URL */
|
|
/* .origin */ "./mount-origin", /* serve from dir */
|
|
/* .def */ "index.html", /* default filename */
|
|
/* .protocol */ NULL,
|
|
/* .cgienv */ NULL,
|
|
/* .extra_mimetypes */ NULL,
|
|
/* .interpret */ NULL,
|
|
/* .cgi_timeout */ 0,
|
|
/* .cache_max_age */ 0,
|
|
/* .auth_mask */ 0,
|
|
/* .cache_reusable */ 0,
|
|
/* .cache_revalidate */ 0,
|
|
/* .cache_intermediaries */ 0,
|
|
/* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
|
|
/* .mountpoint_len */ 1, /* char count */
|
|
/* .basic_auth_login_file */ NULL,
|
|
};
|
|
|
|
void sigint_handler(int sig)
|
|
{
|
|
interrupted = 1;
|
|
}
|
|
|
|
int main(int argc, const char **argv)
|
|
{
|
|
struct lws_context_creation_info info;
|
|
struct lws_context *context;
|
|
const char *p;
|
|
int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
|
|
/* for LLL_ verbosity above NOTICE to be built into lws,
|
|
* lws must have been configured and built with
|
|
* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
|
|
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
|
|
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
|
|
/* | LLL_DEBUG */;
|
|
|
|
signal(SIGINT, sigint_handler);
|
|
|
|
if ((p = lws_cmdline_option(argc, argv, "-d")))
|
|
logs = atoi(p);
|
|
|
|
lws_set_log_level(logs, NULL);
|
|
lwsl_user("LWS minimal http server dynamic | visit http://localhost:7681\n");
|
|
|
|
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
|
|
info.port = 7681;
|
|
info.protocols = protocols;
|
|
info.mounts = &mount;
|
|
|
|
/* for testing ah queue, not useful in real world */
|
|
if (lws_cmdline_option(argc, argv, "--ah1"))
|
|
info.max_http_header_pool = 1;
|
|
|
|
context = lws_create_context(&info);
|
|
if (!context) {
|
|
lwsl_err("lws init failed\n");
|
|
return 1;
|
|
}
|
|
|
|
while (n >= 0 && !interrupted)
|
|
n = lws_service(context, 1000);
|
|
|
|
lws_context_destroy(context);
|
|
|
|
return 0;
|
|
}
|