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|
/*
* lws-minimal-raw-adopt-tcp
*
* 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 integrating somebody else's connected tcp
* socket into the lws event loop as a RAW wsi. It's interesting in
* the kind of situation where you already have a connected socket
* in your application, and you need to hand it over to lws to deal with.
*
* Lws supports "adopting" these foreign sockets.
*
* If you simply want a connected client raw socket using lws alone, you
* can just use lws_client_connect_via_info() with info.method = "RAW".
*
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#if !defined(WIN32)
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if !defined(WIN32)
#include <unistd.h>
#endif
#include <errno.h>
static int
callback_raw_test(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
/* callbacks related to raw socket descriptor */
case LWS_CALLBACK_RAW_ADOPT:
lwsl_user("LWS_CALLBACK_RAW_ADOPT\n");
lws_callback_on_writable(wsi);
break;
case LWS_CALLBACK_RAW_CLOSE:
lwsl_user("LWS_CALLBACK_RAW_CLOSE\n");
break;
case LWS_CALLBACK_RAW_RX:
lwsl_user("LWS_CALLBACK_RAW_RX (%d)\n", (int)len);
lwsl_hexdump_level(LLL_NOTICE, in, len);
break;
case LWS_CALLBACK_RAW_WRITEABLE:
if (lws_write(wsi,
(uint8_t *)"GET / HTTP/1.1\xd\xa\xd\xa", 18,
LWS_WRITE_RAW) != 18) {
lwsl_notice("%s: raw write failed\n", __func__);
return 1;
}
break;
default:
break;
}
return 0;
}
static struct lws_protocols protocols[] = {
{ "raw-test", callback_raw_test, 0, 0, 0, NULL, 0 },
LWS_PROTOCOL_LIST_TERM
};
static int interrupted;
void sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
struct lws_context *context;
lws_sock_file_fd_type sock;
struct addrinfo h, *r, *rp;
struct lws_vhost *vhost;
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 raw adopt tcp\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.options = LWS_SERVER_OPTION_EXPLICIT_VHOSTS;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
info.port = CONTEXT_PORT_NO_LISTEN_SERVER;
info.protocols = protocols;
vhost = lws_create_vhost(context, &info);
if (!vhost) {
lwsl_err("lws vhost creation failed\n");
goto bail;
}
/*
* Connect our own "foreign" socket to libwebsockets.org:80
*
* Normally you would do this with lws_client_connect_via_info() inside
* the lws event loop, hiding all this detail. But this example
* demonstrates how to integrate an externally-connected "foreign"
* socket, so we create one by hand.
*/
memset(&h, 0, sizeof(h));
h.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
h.ai_socktype = SOCK_STREAM;
h.ai_protocol = IPPROTO_TCP;
n = getaddrinfo("libwebsockets.org", "80", &h, &r);
if (n) {
lwsl_err("%s: problem resolving libwebsockets.org: %s\n", __func__, gai_strerror(n));
return 1;
}
for (rp = r; rp; rp = rp->ai_next) {
sock.sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sock.sockfd != LWS_SOCK_INVALID)
break;
}
if (!rp) {
lwsl_err("%s: unable to create INET socket\n", __func__);
freeaddrinfo(r);
return 1;
}
lwsl_user("Starting connect...\n");
if (connect(sock.sockfd, rp->ai_addr, sizeof(*rp->ai_addr)) < 0) {
lwsl_err("%s: unable to connect to libwebsockets.org:80\n", __func__);
freeaddrinfo(r);
return 1;
}
freeaddrinfo(r);
signal(SIGINT, sigint_handler);
lwsl_user("Connected...\n");
/* our foreign socket is connected... adopt it into lws */
if (!lws_adopt_descriptor_vhost(vhost, LWS_ADOPT_SOCKET, sock,
protocols[0].name, NULL)) {
lwsl_err("%s: foreign socket adoption failed\n", __func__);
goto bail;
}
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
bail:
lws_context_destroy(context);
return 0;
}
|
