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4804624905
lws_ss_set_metadata can fail... eg, due to transient OOM situation... if it does, caller must take appropriate action like disconnect and retry. So mark the api as requiring the result checking, and make sure all the examples do it.
237 lines
5.8 KiB
C
237 lines
5.8 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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if (lws_ss_set_metadata(m->ss, "mime",
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"multipart/form-data; boundary=aBoundaryString", 45))
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return LWSSSSRET_DISCONNECT_ME;
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} else
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if (lws_ss_set_metadata(m->ss, "mime", "text/html", 9))
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return LWSSSSRET_DISCONNECT_ME;
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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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