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/*
* lws-minimal-http-server-form-post-lwsac
*
* 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 performs POST with a couple
* of parameters. It dumps the parameters to the console log and redirects
* to another page.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.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 {
struct lws_spa *spa;
struct lwsac *ac;
};
static int interrupted;
static const char * const param_names[] = {
"text1",
"send",
};
enum enum_param_names {
EPN_TEXT1,
EPN_SEND,
};
static int
callback_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 + LWS_RECOMMENDED_MIN_HEADER_SPACE], *start = &buf[LWS_PRE],
*p = start, *end = &buf[sizeof(buf) - 1];
int n;
switch (reason) {
case LWS_CALLBACK_HTTP:
/*
* Manually report that our form target URL exists
*
* you can also do this by adding a mount for the form URL
* to the protocol with type LWSMPRO_CALLBACK, then no need
* to trap LWS_CALLBACK_HTTP.
*/
if (!strcmp((const char *)in, "/form1"))
/* assertively allow it to exist in the URL space */
return 0;
/* default to 404-ing the URL if not mounted */
break;
case LWS_CALLBACK_HTTP_BODY:
/* create the POST argument parser if not already existing */
if (!pss->spa) {
lws_spa_create_info_t i;
memset(&i, 0, sizeof(i));
i.param_names = param_names;
i.count_params = LWS_ARRAY_SIZE(param_names);
i.ac = &pss->ac;
i.ac_chunk_size = 512;
pss->spa = lws_spa_create_via_info(wsi, &i); /* no file upload */
if (!pss->spa)
return -1;
}
/* let it parse the POST data */
if (lws_spa_process(pss->spa, in, (int)len))
return -1;
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
/* inform the spa no more payload data coming */
lwsl_user("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
lws_spa_finalize(pss->spa);
/* we just dump the decoded things to the log */
for (n = 0; n < (int)LWS_ARRAY_SIZE(param_names); n++) {
if (!lws_spa_get_string(pss->spa, n))
lwsl_user("%s: undefined\n", param_names[n]);
else
lwsl_user("%s: (len %d) '%s'\n",
param_names[n],
lws_spa_get_length(pss->spa, n),
lws_spa_get_string(pss->spa, n));
}
lwsac_free(&pss->ac);
/*
* Our response is to redirect to a static page. We could
* have generated a dynamic html page here instead.
*/
if (lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
(unsigned char *)"after-form1.html",
16, &p, end) < 0)
return -1;
break;
case LWS_CALLBACK_HTTP_DROP_PROTOCOL:
/* called when our wsi user_space is going to be destroyed */
if (pss->spa) {
lws_spa_destroy(pss->spa);
pss->spa = NULL;
}
lwsac_free(&pss->ac);
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static struct lws_protocols protocols[] = {
{ "http", callback_http, sizeof(struct pss), 0 },
{ NULL, NULL, 0, 0 } /* terminator */
};
/* default mount serves the URL space from ./mount-origin */
static const struct lws_http_mount mount = {
/* .mount_next */ NULL, /* 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 POST | visit http://localhost:7681\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.port = 7681;
info.protocols = protocols;
info.mounts = &mount;
info.options =
LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
if (lws_cmdline_option(argc, argv, "-s")) {
info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.ssl_cert_filepath = "localhost-100y.cert";
info.ssl_private_key_filepath = "localhost-100y.key";
}
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;
}