mirror of
https://github.com/warmcat/libwebsockets.git
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c9731c5f17
This is a huge patch that should be a global NOP. For unix type platforms it enables -Wconversion to issue warnings (-> error) for all automatic casts that seem less than ideal but are normally concealed by the toolchain. This is things like passing an int to a size_t argument. Once enabled, I went through all args on my default build (which build most things) and tried to make the removed default cast explicit. With that approach it neither change nor bloat the code, since it compiles to whatever it was doing before, just with the casts made explicit... in a few cases I changed some length args from int to size_t but largely left the causes alone. From now on, new code that is relying on less than ideal casting will complain and nudge me to improve it by warnings.
235 lines
5.7 KiB
C
235 lines
5.7 KiB
C
/*
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* lws-minimal-secure-streams-server
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*
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* Written in 2010-2020 by Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*/
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#include <libwebsockets.h>
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#include <assert.h>
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extern int interrupted, bad, multipart;
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static const char *html =
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/* normally we serve this... */
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"<head><meta content=\"text/html;charset=utf-8\" "
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"http-equiv=\"Content-Type\"><script>"
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" var ws = new WebSocket(\"wss://localhost:7681\", \"mywsprotocol\");"
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"try { ws.onopen = function() { console.log(\"open\"); }; "
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"ws.onmessage = function got_packet(msg) { "
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"var s=\"\"; s += msg.data; "
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"document.getElementById(\"wsd\").innerHTML = s; };"
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"} catch(exception) {"
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"alert(\"<p>Error\" + exception); }"
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"</script></head><html><body>"
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"Hello from the web server<br>"
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"<div id=\"wsd\"></div>"
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"</body></html>",
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*multipart_html =
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/*
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* If you use -m commandline switch we send this instead, as
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* multipart/form-data
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*/
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"--aBoundaryString\r\n"
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"Content-Disposition: form-data; name=\"myFile\"; filename=\"xxx.txt\"\r\n"
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"Content-Type: text/plain\r\n"
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"\r\n"
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"The file contents\r\n"
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"--aBoundaryString\r\n"
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"Content-Disposition: form-data; name=\"myField\"\r\n"
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"\r\n"
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"(data)\r\n"
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"--aBoundaryString--\r\n";
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typedef struct myss {
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struct lws_ss_handle *ss;
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void *opaque_data;
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/* ... application specific state ... */
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lws_sorted_usec_list_t sul;
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int count;
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char upgraded;
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} myss_srv_t;
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/*
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* This is the Secure Streams Server RX and TX for HTTP(S)
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*/
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static lws_ss_state_return_t
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myss_srv_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
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{
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// myss_srv_t *m = (myss_srv_t *)userobj;
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lwsl_user("%s: len %d, flags: %d\n", __func__, (int)len, flags);
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lwsl_hexdump_info(buf, len);
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/*
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* If we received the whole message, for our example it means
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* we are done.
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*/
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if (flags & LWSSS_FLAG_EOM) {
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bad = 0;
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interrupted = 1;
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}
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return 0;
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}
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static lws_ss_state_return_t
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myss_srv_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf, size_t *len,
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int *flags)
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{
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myss_srv_t *m = (myss_srv_t *)userobj;
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const char *send = html;
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if (m->upgraded)
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return LWSSSSRET_TX_DONT_SEND;
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if (multipart)
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send = multipart_html;
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*flags = LWSSS_FLAG_SOM | LWSSS_FLAG_EOM;
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lws_strncpy((char *)buf, send, *len);
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*len = strlen(send);
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return 0;
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}
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/*
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* This is the Secure Streams Server RX and TX for WS(S)... when we get a
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* state that the underlying connection upgraded protocol, we switch the stream
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* rx and tx handlers to here.
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*/
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static lws_ss_state_return_t
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myss_ws_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
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{
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// myss_srv_t *m = (myss_srv_t *)userobj;
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lwsl_user("%s: len %d, flags: %d\n", __func__, (int)len, flags);
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lwsl_hexdump_info(buf, len);
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/*
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* If we received the whole message, for our example it means
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* we are done.
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*/
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if (flags & LWSSS_FLAG_EOM) {
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bad = 0;
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interrupted = 1;
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}
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return 0;
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}
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/* this is the callback that mediates sending the incrementing number */
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static void
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spam_sul_cb(struct lws_sorted_usec_list *sul)
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{
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myss_srv_t *m = lws_container_of(sul, myss_srv_t, sul);
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lws_ss_request_tx(m->ss);
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lws_sul_schedule(lws_ss_get_context(m->ss), 0, &m->sul, spam_sul_cb,
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100 * LWS_US_PER_MS);
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}
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static lws_ss_state_return_t
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myss_ws_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf, size_t *len,
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int *flags)
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{
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myss_srv_t *m = (myss_srv_t *)userobj;
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*flags = LWSSS_FLAG_SOM | LWSSS_FLAG_EOM;
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*len = (unsigned int)lws_snprintf((char *)buf, *len, "hello from ws %d", m->count++);
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lws_sul_schedule(lws_ss_get_context(m->ss), 0, &m->sul, spam_sul_cb,
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100 * LWS_US_PER_MS);
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return 0;
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}
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static lws_ss_state_return_t
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myss_srv_state(void *userobj, void *sh, lws_ss_constate_t state,
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lws_ss_tx_ordinal_t ack)
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{
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myss_srv_t *m = (myss_srv_t *)userobj;
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lwsl_user("%s: %p %s, ord 0x%x\n", __func__, m->ss,
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lws_ss_state_name((int)state), (unsigned int)ack);
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switch (state) {
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case LWSSSCS_DISCONNECTED:
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lws_sul_cancel(&m->sul);
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break;
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case LWSSSCS_CREATING:
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lws_ss_request_tx(m->ss);
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break;
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case LWSSSCS_ALL_RETRIES_FAILED:
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/* if we're out of retries, we want to close the app and FAIL */
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interrupted = 1;
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break;
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case LWSSSCS_SERVER_TXN:
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/*
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* The underlying protocol started a transaction, let's
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* describe how we want to complete it. We can defer this until
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* later, eg, after we have consumed any rx that's coming with
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* the client's transaction initiation phase, but in this
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* example we know what we want to do already.
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*
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* We do want to ack the transaction...
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*/
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lws_ss_server_ack(m->ss, 0);
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/*
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* ... it's going to be either text/html or multipart ...
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*/
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if (multipart)
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lws_ss_set_metadata(m->ss, "mime",
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"multipart/form-data; boundary=aBoundaryString", 45);
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else
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lws_ss_set_metadata(m->ss, "mime", "text/html", 9);
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/*
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* ...it's going to be whatever size it is (and request tx)
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*/
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lws_ss_request_tx_len(m->ss, (unsigned long)
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(multipart ? strlen(multipart_html) :
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strlen(html)));
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break;
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case LWSSSCS_SERVER_UPGRADE:
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/*
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* This is sent when the underlying protocol has experienced
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* an upgrade, eg, http->ws... it's a one-way upgrade on this
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* stream, change the handlers to deal with the kind of
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* messages we send on ws
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*/
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m->upgraded = 1;
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lws_ss_change_handlers(m->ss, myss_ws_rx, myss_ws_tx, NULL);
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lws_ss_request_tx(m->ss); /* we want to start sending numbers */
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break;
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default:
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break;
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}
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return 0;
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}
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const lws_ss_info_t ssi_server = {
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.handle_offset = offsetof(myss_srv_t, ss),
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.opaque_user_data_offset = offsetof(myss_srv_t, opaque_data),
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.streamtype = "myserver",
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.rx = myss_srv_rx,
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.tx = myss_srv_tx,
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.state = myss_srv_state,
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.user_alloc = sizeof(myss_srv_t),
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};
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