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// SPDX-License-Identifier: GPL-3.0-or-later
#define ACLK_LWS_HTTPS_CLIENT_INTERNAL
#include "aclk_lws_https_client.h"
#include "aclk_common.h"
#include "aclk_lws_wss_client.h"
#define SMALL_BUFFER 16
struct simple_hcc_data {
char *data;
size_t data_size;
size_t written;
char lws_work_buffer[1024 + LWS_PRE];
char *payload;
int response_code;
int done;
};
static int simple_https_client_callback(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
UNUSED(user);
int n;
char *ptr;
char buffer[SMALL_BUFFER];
struct simple_hcc_data *perconn_data = lws_get_opaque_user_data(wsi);
switch (reason) {
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
debug(D_ACLK, "LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ");
if (perconn_data->data_size - 1 - perconn_data->written < len)
return 1;
memcpy(&perconn_data->data[perconn_data->written], in, len);
perconn_data->written += len;
return 0;
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
debug(D_ACLK, "LWS_CALLBACK_RECEIVE_CLIENT_HTTP");
if(!perconn_data) {
error("Missing Per Connect Data");
return -1;
}
n = sizeof(perconn_data->lws_work_buffer) - LWS_PRE;
ptr = perconn_data->lws_work_buffer + LWS_PRE;
if (lws_http_client_read(wsi, &ptr, &n) < 0)
return -1;
perconn_data->data[perconn_data->written] = '\0';
return 0;
case LWS_CALLBACK_WSI_DESTROY:
debug(D_ACLK, "LWS_CALLBACK_WSI_DESTROY");
if(perconn_data)
perconn_data->done = 1;
return 0;
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
debug(D_ACLK, "LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP");
if(perconn_data)
perconn_data->response_code = lws_http_client_http_response(wsi);
return 0;
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
debug(D_ACLK, "LWS_CALLBACK_CLOSED_CLIENT_HTTP");
return 0;
case LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS:
debug(D_ACLK, "LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS");
return 0;
case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER:
debug(D_ACLK, "LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER");
if(perconn_data && perconn_data->payload) {
unsigned char **p = (unsigned char **)in, *end = (*p) + len;
snprintfz(buffer, SMALL_BUFFER, "%zu", strlen(perconn_data->payload));
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_LENGTH,
(unsigned char *)buffer, strlen(buffer), p, end))
return -1;
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)ACLK_CONTENT_TYPE_JSON,
strlen(ACLK_CONTENT_TYPE_JSON), p, end))
return -1;
lws_client_http_body_pending(wsi, 1);
lws_callback_on_writable(wsi);
}
return 0;
case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE:
debug(D_ACLK, "LWS_CALLBACK_CLIENT_HTTP_WRITEABLE");
if(perconn_data && perconn_data->payload) {
n = strlen(perconn_data->payload);
if(perconn_data->data_size < (size_t)LWS_PRE + n + 1) {
error("Buffer given is not big enough");
return 1;
}
memcpy(&perconn_data->data[LWS_PRE], perconn_data->payload, n);
if(n != lws_write(wsi, (unsigned char*)&perconn_data->data[LWS_PRE], n, LWS_WRITE_HTTP)) {
error("lws_write error");
perconn_data->data[0] = 0;
return 1;
}
lws_client_http_body_pending(wsi, 0);
// clean for subsequent reply read
perconn_data->data[0] = 0;
}
return 0;
case LWS_CALLBACK_CLIENT_HTTP_BIND_PROTOCOL:
debug(D_ACLK, "LWS_CALLBACK_CLIENT_HTTP_BIND_PROTOCOL");
return 0;
case LWS_CALLBACK_WSI_CREATE:
debug(D_ACLK, "LWS_CALLBACK_WSI_CREATE");
return 0;
case LWS_CALLBACK_PROTOCOL_INIT:
debug(D_ACLK, "LWS_CALLBACK_PROTOCOL_INIT");
return 0;
case LWS_CALLBACK_CLIENT_HTTP_DROP_PROTOCOL:
debug(D_ACLK, "LWS_CALLBACK_CLIENT_HTTP_DROP_PROTOCOL");
return 0;
case LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED:
debug(D_ACLK, "LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED");
return 0;
case LWS_CALLBACK_GET_THREAD_ID:
debug(D_ACLK, "LWS_CALLBACK_GET_THREAD_ID");
return 0;
case LWS_CALLBACK_EVENT_WAIT_CANCELLED:
debug(D_ACLK, "LWS_CALLBACK_EVENT_WAIT_CANCELLED");
return 0;
case LWS_CALLBACK_OPENSSL_PERFORM_SERVER_CERT_VERIFICATION:
debug(D_ACLK, "LWS_CALLBACK_OPENSSL_PERFORM_SERVER_CERT_VERIFICATION");
return 0;
case LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH:
debug(D_ACLK, "LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH");
return 0;
default:
debug(D_ACLK, "Unknown callback %d", (int)reason);
return 0;
}
}
static const struct lws_protocols protocols[] = {
{
"http",
simple_https_client_callback,
0,
0,
0,
0,
0
},
{ NULL, NULL, 0, 0, 0, 0, 0 }
};
static void simple_hcc_log_divert(int level, const char *line)
{
UNUSED(level);
error("Libwebsockets: %s", line);
}
int aclk_send_https_request(char *method, char *host, int port, char *url, char *b, size_t b_size, char *payload)
{
info("%s %s", __func__, method);
struct lws_context_creation_info info;
struct lws_client_connect_info i;
struct lws_context *context;
struct simple_hcc_data *data = callocz(1, sizeof(struct simple_hcc_data));
data->data = b;
data->data[0] = 0;
data->data_size = b_size;
data->payload = payload;
int n = 0;
time_t timestamp;
struct lws_vhost *vhost;
memset(&info, 0, sizeof info);
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.port = CONTEXT_PORT_NO_LISTEN;
info.protocols = protocols;
context = lws_create_context(&info);
if (!context) {
error("Error creating LWS context");
freez(data);
return 1;
}
lws_set_log_level(LLL_ERR | LLL_WARN, simple_hcc_log_divert);
lws_service(context, 0);
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
#ifdef ACLK_SSL_ALLOW_SELF_SIGNED
i.ssl_connection = LCCSCF_USE_SSL | LCCSCF_ALLOW_SELFSIGNED | LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK | LCCSCF_ALLOW_INSECURE;
info("Disabling SSL certificate checks");
#else
i.ssl_connection = LCCSCF_USE_SSL;
#endif
#if defined(HAVE_X509_VERIFY_PARAM_set1_host) && HAVE_X509_VERIFY_PARAM_set1_host == 0
#warning DISABLING SSL HOSTNAME VALIDATION BECAUSE IT IS NOT AVAILABLE ON THIS SYSTEM.
i.ssl_connection |= LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK;
#endif
i.port = port;
i.address = host;
i.path = url;
i.host = i.address;
i.origin = i.address;
i.method = method;
i.opaque_user_data = data;
i.alpn = "http/1.1";
i.protocol = protocols[0].name;
vhost = lws_get_vhost_by_name(context, "default");
if(!vhost)
fatal("Could not find the default LWS vhost.");
//set up proxy
aclk_wss_set_proxy(vhost);
lws_client_connect_via_info(&i);
// libwebsockets handle connection timeouts already
// this adds additional safety in case of bug in LWS
timestamp = now_monotonic_sec();
while( n >= 0 && !data->done && !netdata_exit) {
n = lws_service(context, 0);
if( now_monotonic_sec() - timestamp > SEND_HTTPS_REQUEST_TIMEOUT ) {
data->data[0] = 0;
data->done = 1;
error("Servicing LWS took too long.");
}
}
lws_context_destroy(context);
n = data->response_code;
freez(data);
return (n < 200 || n >= 300);
}
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