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/*
* lws-minimal-http-server-form-get
*
* Written in 2010-2019 by 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 a form GET 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>
static int interrupted;
static const char * param_names[] = {
"text1",
"send"
};
static int
callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
void *in, size_t len)
{
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:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI))
/* not a GET */
break;
lwsl_err("%s: %s\n", __func__, (const char *)in);
if (strcmp((const char *)in, "/form1"))
/* not our form URL */
break;
/* we just dump the decoded things to the log */
for (n = 0; n < (int)LWS_ARRAY_SIZE(param_names); n++) {
int rv = lws_get_urlarg_by_name_safe(wsi, param_names[n],
(char *)buf, sizeof(buf));
if (rv < 0)
lwsl_user("%s: undefined\n", param_names[n]);
else
lwsl_user("%s: (len %d) '%s'\n", param_names[n],
(int)rv, buf);
}
/*
* 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;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static struct lws_protocols protocols[] = {
{ "http", callback_http, 0, 0, 0, NULL, 0 },
LWS_PROTOCOL_LIST_TERM
};
/* 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 GET | 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;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
return 0;
}
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