static int
callback_dumb_increment(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
int n;
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
LWS_SEND_BUFFER_POST_PADDING];
unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
struct per_session_data__dumb_increment *pss = (struct per_session_data__dumb_increment *)user;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("callback_dumb_increment: "
"LWS_CALLBACK_ESTABLISHED\n");
pss->number = 0;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
n = sprintf((char *)p, "%d", pss->number++);
/* too small for partial */
n = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
if (n < 0) {
lwsl_err("ERROR %d writing to di socket\n", n);
return -1;
}
if (close_testing && pss->number == 50) {
lwsl_info("close tesing limit, closing\n");
return -1;
}
break;
case LWS_CALLBACK_RECEIVE:
// fprintf(stderr, "rx %d\n", (int)len);
if (len < 6)
break;
if (strcmp((const char *)in, "reset\n") == 0)
pss->number = 0;
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
static int
callback_test (struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
printf("reason = FILTER_PROTOCOL_CONNECTION.\n");
dump_handshake_info (wsi);
break;
case LWS_CALLBACK_ESTABLISHED: // just log message that someone is connecting
printf("connection ESTABLISHED\n");
break;
case LWS_CALLBACK_RECEIVE: {
// the funny part
// create a buffer to hold our response
// it has to have some pre and post padding. You don't need to care
// what comes there, libwebsockets will do everything for you. For more info see
// http://git.warmcat.com/cgi-bin/cgit/libwebsockets/tree/lib/libwebsockets.h#n597
unsigned char *buf = (unsigned char*) malloc(LWS_SEND_BUFFER_PRE_PADDING + len + LWS_SEND_BUFFER_POST_PADDING);
int i;
// pointer to `void *in` holds the incomming request
// we're just going to put it in reverse order and put it in `buf` with
// correct offset. `len` holds length of the request.
for (i=0; i < len; i++) {
buf[LWS_SEND_BUFFER_PRE_PADDING + (len - 1) - i ] = ((char *) in)[i];
}
// log what we recieved and what we're going to send as a response.
// that disco syntax `%.*s` is used to print just a part of our buffer
// http://stackoverflow.com/questions/5189071/print-part-of-char-array
printf("received data: %s, replying: %.*s\n", (char *) in, (int) len,
buf + LWS_SEND_BUFFER_PRE_PADDING);
// send response
// just notice that we have to tell where exactly our response starts. That's
// why there's `buf[LWS_SEND_BUFFER_PRE_PADDING]` and how long it is.
// we know that our response has the same length as request because
// it's the same message in reverse order.
libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING], len, LWS_WRITE_TEXT);
// release memory back into the wild
free(buf);
break;
}
default:
break;
}
return 0;
}
int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
void *in, size_t len)
{
struct per_session_data__http *pss =
(struct per_session_data__http *)user;
unsigned char buffer[4096 + LWS_PRE];
unsigned long amount, file_len, sent;
char leaf_path[1024];
const char *mimetype;
char *other_headers;
unsigned char *end;
struct timeval tv;
unsigned char *p;
char buf[256];
char b64[64];
int n, m;
#ifdef EXTERNAL_POLL
struct lws_pollargs *pa = (struct lws_pollargs *)in;
#endif
switch (reason) {
case LWS_CALLBACK_HTTP:
if (debug_level & LLL_INFO) {
dump_handshake_info(wsi);
/* dump the individual URI Arg parameters */
n = 0;
while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf),
WSI_TOKEN_HTTP_URI_ARGS, n) > 0) {
lwsl_notice("URI Arg %d: %s\n", ++n, buf);
}
}
{
char name[100], rip[50];
lws_get_peer_addresses(wsi, lws_get_socket_fd(wsi), name,
sizeof(name), rip, sizeof(rip));
sprintf(buf, "%s (%s)", name, rip);
lwsl_notice("HTTP connect from %s\n", buf);
}
if (len < 1) {
lws_return_http_status(wsi,
HTTP_STATUS_BAD_REQUEST, NULL);
goto try_to_reuse;
}
/* this example server has no concept of directories */
if (strchr((const char *)in + 1, '/')) {
lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
goto try_to_reuse;
}
/* if a legal POST URL, let it continue and accept data */
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
return 0;
/* check for the "send a big file by hand" example case */
if (!strcmp((const char *)in, "/leaf.jpg")) {
if (strlen(resource_path) > sizeof(leaf_path) - 10)
return -1;
sprintf(leaf_path, "%s/leaf.jpg", resource_path);
/* well, let's demonstrate how to send the hard way */
p = buffer + LWS_PRE;
end = p + sizeof(buffer) - LWS_PRE;
pss->fd = lws_plat_file_open(wsi, leaf_path, &file_len,
LWS_O_RDONLY);
if (pss->fd == LWS_INVALID_FILE) {
lwsl_err("faild to open file %s\n", leaf_path);
return -1;
}
/*
* we will send a big jpeg file, but it could be
* anything. Set the Content-Type: appropriately
* so the browser knows what to do with it.
*
* Notice we use the APIs to build the header, which
* will do the right thing for HTTP 1/1.1 and HTTP2
* depending on what connection it happens to be working
* on
*/
if (lws_add_http_header_status(wsi, 200, &p, end))
return 1;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
(unsigned char *)"libwebsockets",
13, &p, end))
return 1;
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"image/jpeg",
10, &p, end))
return 1;
if (lws_add_http_header_content_length(wsi,
file_len, &p,
end))
return 1;
if (lws_finalize_http_header(wsi, &p, end))
return 1;
/*
* send the http headers...
* this won't block since it's the first payload sent
* on the connection since it was established
* (too small for partial)
*
* Notice they are sent using LWS_WRITE_HTTP_HEADERS
* which also means you can't send body too in one step,
* this is mandated by changes in HTTP2
*/
*p = '\0';
lwsl_info("%s\n", buffer + LWS_PRE);
n = lws_write(wsi, buffer + LWS_PRE, p - (buffer + LWS_PRE),
LWS_WRITE_HTTP_HEADERS);
if (n < 0) {
lws_plat_file_close(wsi, pss->fd);
return -1;
}
/*
* book us a LWS_CALLBACK_HTTP_WRITEABLE callback
*/
lws_callback_on_writable(wsi);
break;
}
/* if not, send a file the easy way */
strcpy(buf, resource_path);
if (strcmp(in, "/")) {
if (*((const char *)in) != '/')
strcat(buf, "/");
strncat(buf, in, sizeof(buf) - strlen(resource_path));
} else /* default file to serve */
strcat(buf, "/test.html");
buf[sizeof(buf) - 1] = '\0';
/* refuse to serve files we don't understand */
mimetype = get_mimetype(buf);
if (!mimetype) {
lwsl_err("Unknown mimetype for %s\n", buf);
lws_return_http_status(wsi,
HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
return -1;
}
/* demonstrates how to set a cookie on / */
other_headers = leaf_path;
p = (unsigned char *)leaf_path;
if (!strcmp((const char *)in, "/") &&
!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
/* this isn't very unguessable but it'll do for us */
gettimeofday(&tv, NULL);
n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
(unsigned int)tv.tv_sec,
(unsigned int)tv.tv_usec);
if (lws_add_http_header_by_name(wsi,
(unsigned char *)"set-cookie:",
(unsigned char *)b64, n, &p,
(unsigned char *)leaf_path + sizeof(leaf_path)))
return 1;
}
if (lws_is_ssl(wsi) && lws_add_http_header_by_name(wsi,
(unsigned char *)
"Strict-Transport-Security:",
(unsigned char *)
"max-age=15768000 ; "
"includeSubDomains", 36, &p,
(unsigned char *)leaf_path +
sizeof(leaf_path)))
return 1;
n = (char *)p - leaf_path;
n = lws_serve_http_file(wsi, buf, mimetype, other_headers, n);
if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
return -1; /* error or can't reuse connection: close the socket */
/*
* notice that the sending of the file completes asynchronously,
* we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
* it's done
*/
break;
case LWS_CALLBACK_HTTP_BODY:
strncpy(buf, in, 20);
buf[20] = '\0';
if (len < 20)
buf[len] = '\0';
lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
(const char *)buf, (int)len);
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
/* the whole of the sent body arrived, close or reuse the connection */
lws_return_http_status(wsi, HTTP_STATUS_OK, NULL);
goto try_to_reuse;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
goto try_to_reuse;
case LWS_CALLBACK_HTTP_WRITEABLE:
lwsl_info("LWS_CALLBACK_HTTP_WRITEABLE\n");
if (pss->fd == LWS_INVALID_FILE)
goto try_to_reuse;
/*
* we can send more of whatever it is we were sending
*/
sent = 0;
do {
/* we'd like the send this much */
n = sizeof(buffer) - LWS_PRE;
/* but if the peer told us he wants less, we can adapt */
m = lws_get_peer_write_allowance(wsi);
/* -1 means not using a protocol that has this info */
if (m == 0)
/* right now, peer can't handle anything */
goto later;
if (m != -1 && m < n)
/* he couldn't handle that much */
n = m;
n = lws_plat_file_read(wsi, pss->fd,
&amount, buffer + LWS_PRE, n);
/* problem reading, close conn */
if (n < 0) {
lwsl_err("problem reading file\n");
goto bail;
}
n = (int)amount;
/* sent it all, close conn */
if (n == 0)
goto penultimate;
/*
* To support HTTP2, must take care about preamble space
*
* identification of when we send the last payload frame
* is handled by the library itself if you sent a
* content-length header
*/
m = lws_write(wsi, buffer + LWS_PRE, n, LWS_WRITE_HTTP);
if (m < 0) {
lwsl_err("write failed\n");
/* write failed, close conn */
goto bail;
}
if (m) /* while still active, extend timeout */
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, 5);
sent += m;
} while (!lws_send_pipe_choked(wsi) && (sent < 1024 * 1024));
later:
lws_callback_on_writable(wsi);
break;
penultimate:
lws_plat_file_close(wsi, pss->fd);
pss->fd = LWS_INVALID_FILE;
goto try_to_reuse;
bail:
lws_plat_file_close(wsi, pss->fd);
return -1;
/*
* callback for confirming to continue with client IP appear in
* protocol 0 callback since no websocket protocol has been agreed
* yet. You can just ignore this if you won't filter on client IP
* since the default uhandled callback return is 0 meaning let the
* connection continue.
*/
case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
/* if we returned non-zero from here, we kill the connection */
break;
/*
* callbacks for managing the external poll() array appear in
* protocol 0 callback
*/
case LWS_CALLBACK_LOCK_POLL:
/*
* lock mutex to protect pollfd state
* called before any other POLL related callback
* if protecting wsi lifecycle change, len == 1
*/
test_server_lock(len);
break;
case LWS_CALLBACK_UNLOCK_POLL:
/*
* unlock mutex to protect pollfd state when
* called after any other POLL related callback
* if protecting wsi lifecycle change, len == 1
*/
test_server_unlock(len);
break;
#ifdef EXTERNAL_POLL
case LWS_CALLBACK_ADD_POLL_FD:
if (count_pollfds >= max_poll_elements) {
lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
return 1;
}
fd_lookup[pa->fd] = count_pollfds;
pollfds[count_pollfds].fd = pa->fd;
pollfds[count_pollfds].events = pa->events;
pollfds[count_pollfds++].revents = 0;
break;
case LWS_CALLBACK_DEL_POLL_FD:
if (!--count_pollfds)
break;
m = fd_lookup[pa->fd];
/* have the last guy take up the vacant slot */
pollfds[m] = pollfds[count_pollfds];
fd_lookup[pollfds[count_pollfds].fd] = m;
break;
case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
pollfds[fd_lookup[pa->fd]].events = pa->events;
break;
#endif
case LWS_CALLBACK_GET_THREAD_ID:
/*
* if you will call "lws_callback_on_writable"
* from a different thread, return the caller thread ID
* here so lws can use this information to work out if it
* should signal the poll() loop to exit and restart early
*/
/* return pthread_getthreadid_np(); */
break;
default:
break;
}
return 0;
/* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
try_to_reuse:
if (lws_http_transaction_completed(wsi))
return -1;
return 0;
}
static int
callback_lws_mirror(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
int n;
struct per_session_data__lws_mirror *pss = (struct per_session_data__lws_mirror *)user;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("callback_lws_mirror: LWS_CALLBACK_ESTABLISHED\n");
pss->ringbuffer_tail = ringbuffer_head;
pss->wsi = wsi;
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
lwsl_notice("mirror protocol cleaning up\n");
for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
if (ringbuffer[n].payload)
free(ringbuffer[n].payload);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
if (close_testing)
break;
while (pss->ringbuffer_tail != ringbuffer_head) {
n = libwebsocket_write(wsi, (unsigned char *)
ringbuffer[pss->ringbuffer_tail].payload +
LWS_SEND_BUFFER_PRE_PADDING,
ringbuffer[pss->ringbuffer_tail].len,
LWS_WRITE_TEXT);
if (n < 0) {
lwsl_err("ERROR %d writing to mirror socket\n", n);
return -1;
}
if (n < ringbuffer[pss->ringbuffer_tail].len)
lwsl_err("mirror partial write %d vs %d\n",
n, ringbuffer[pss->ringbuffer_tail].len);
if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
pss->ringbuffer_tail = 0;
else
pss->ringbuffer_tail++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
libwebsocket_rx_flow_allow_all_protocol(
libwebsockets_get_protocol(wsi));
// lwsl_debug("tx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
if (lws_send_pipe_choked(wsi)) {
libwebsocket_callback_on_writable(context, wsi);
break;
}
/*
* for tests with chrome on same machine as client and
* server, this is needed to stop chrome choking
*/
#ifdef _WIN32
Sleep(1);
#else
usleep(1);
#endif
}
break;
case LWS_CALLBACK_RECEIVE:
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
lwsl_err("dropping!\n");
goto choke;
}
if (ringbuffer[ringbuffer_head].payload)
free(ringbuffer[ringbuffer_head].payload);
ringbuffer[ringbuffer_head].payload =
malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
LWS_SEND_BUFFER_POST_PADDING);
ringbuffer[ringbuffer_head].len = len;
memcpy((char *)ringbuffer[ringbuffer_head].payload +
LWS_SEND_BUFFER_PRE_PADDING, in, len);
if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
ringbuffer_head = 0;
else
ringbuffer_head++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
goto done;
choke:
lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
libwebsocket_rx_flow_control(wsi, 0);
// lwsl_debug("rx fifo %d\n", (ringbuffer_head - pss->ringbuffer_tail) & (MAX_MESSAGE_QUEUE - 1));
done:
libwebsocket_callback_on_writable_all_protocol(
libwebsockets_get_protocol(wsi));
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
static int callback_http(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason, void *user,
void *in, size_t len)
{
#if 0
char client_name[128];
char client_ip[128];
#endif
char buf[256];
char leaf_path[1024];
char b64[64];
struct timeval tv;
int n, m;
unsigned char *p;
char *other_headers;
static unsigned char buffer[4096];
struct stat stat_buf;
struct per_session_data__http *pss =
(struct per_session_data__http *)user;
const char *mimetype;
#ifdef EXTERNAL_POLL
struct libwebsocket_pollargs *pa = (struct libwebsocket_pollargs *)in;
#endif
switch (reason) {
case LWS_CALLBACK_HTTP:
dump_handshake_info(wsi);
if (len < 1) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_BAD_REQUEST, NULL);
return -1;
}
/* this server has no concept of directories */
if (strchr((const char *)in + 1, '/')) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_FORBIDDEN, NULL);
return -1;
}
/* if a legal POST URL, let it continue and accept data */
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
return 0;
/* check for the "send a big file by hand" example case */
if (!strcmp((const char *)in, "/leaf.jpg")) {
if (strlen(resource_path) > sizeof(leaf_path) - 10)
return -1;
sprintf(leaf_path, "%s/leaf.jpg", resource_path);
/* well, let's demonstrate how to send the hard way */
p = buffer;
#ifdef WIN32
pss->fd = open(leaf_path, O_RDONLY | _O_BINARY);
#else
pss->fd = open(leaf_path, O_RDONLY);
#endif
if (pss->fd < 0)
return -1;
fstat(pss->fd, &stat_buf);
/*
* we will send a big jpeg file, but it could be
* anything. Set the Content-Type: appropriately
* so the browser knows what to do with it.
*/
p += sprintf((char *)p,
"HTTP/1.0 200 OK\x0d\x0a"
"Server: libwebsockets\x0d\x0a"
"Content-Type: image/jpeg\x0d\x0a"
"Content-Length: %u\x0d\x0a\x0d\x0a",
(unsigned int)stat_buf.st_size);
/*
* send the http headers...
* this won't block since it's the first payload sent
* on the connection since it was established
* (too small for partial)
*/
n = libwebsocket_write(wsi, buffer,
p - buffer, LWS_WRITE_HTTP);
if (n < 0) {
close(pss->fd);
return -1;
}
/*
* book us a LWS_CALLBACK_HTTP_WRITEABLE callback
*/
libwebsocket_callback_on_writable(context, wsi);
break;
}
/* if not, send a file the easy way */
strcpy(buf, resource_path);
if (strcmp(in, "/")) {
if (*((const char *)in) != '/')
strcat(buf, "/");
strncat(buf, in, sizeof(buf) - strlen(resource_path));
} else /* default file to serve */
strcat(buf, "/test.html");
buf[sizeof(buf) - 1] = '\0';
/* refuse to serve files we don't understand */
mimetype = get_mimetype(buf);
if (!mimetype) {
lwsl_err("Unknown mimetype for %s\n", buf);
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
return -1;
}
/* demostrates how to set a cookie on / */
other_headers = NULL;
if (!strcmp((const char *)in, "/") &&
!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
/* this isn't very unguessable but it'll do for us */
gettimeofday(&tv, NULL);
sprintf(b64, "LWS_%u_%u_COOKIE",
(unsigned int)tv.tv_sec,
(unsigned int)tv.tv_usec);
sprintf(leaf_path,
"Set-Cookie: test=LWS_%u_%u_COOKIE;Max-Age=360000\x0d\x0a",
(unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec);
other_headers = leaf_path;
lwsl_err(other_headers);
}
if (libwebsockets_serve_http_file(context, wsi, buf,
mimetype, other_headers))
return -1; /* through completion or error, close the socket */
/*
* notice that the sending of the file completes asynchronously,
* we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
* it's done
*/
break;
case LWS_CALLBACK_HTTP_BODY:
strncpy(buf, in, 20);
buf[20] = '\0';
if (len < 20)
buf[len] = '\0';
lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
(const char *)buf, (int)len);
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
/* the whole of the sent body arried, close the connection */
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_OK, NULL);
return -1;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
// lwsl_info("LWS_CALLBACK_HTTP_FILE_COMPLETION seen\n");
/* kill the connection after we sent one file */
return -1;
case LWS_CALLBACK_HTTP_WRITEABLE:
/*
* we can send more of whatever it is we were sending
*/
do {
n = read(pss->fd, buffer, sizeof buffer);
/* problem reading, close conn */
if (n < 0)
goto bail;
/* sent it all, close conn */
if (n == 0)
goto flush_bail;
/*
* because it's HTTP and not websocket, don't need to take
* care about pre and postamble
*/
m = libwebsocket_write(wsi, buffer, n, LWS_WRITE_HTTP);
if (m < 0)
/* write failed, close conn */
goto bail;
if (m != n)
/* partial write, adjust */
lseek(pss->fd, m - n, SEEK_CUR);
if (m) /* while still active, extend timeout */
libwebsocket_set_timeout(wsi,
PENDING_TIMEOUT_HTTP_CONTENT, 5);
} while (!lws_send_pipe_choked(wsi));
libwebsocket_callback_on_writable(context, wsi);
break;
flush_bail:
/* true if still partial pending */
if (lws_send_pipe_choked(wsi)) {
libwebsocket_callback_on_writable(context, wsi);
break;
}
bail:
close(pss->fd);
return -1;
/*
* callback for confirming to continue with client IP appear in
* protocol 0 callback since no websocket protocol has been agreed
* yet. You can just ignore this if you won't filter on client IP
* since the default uhandled callback return is 0 meaning let the
* connection continue.
*/
case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
#if 0
libwebsockets_get_peer_addresses(context, wsi, (int)(long)in, client_name,
sizeof(client_name), client_ip, sizeof(client_ip));
fprintf(stderr, "Received network connect from %s (%s)\n",
client_name, client_ip);
#endif
/* if we returned non-zero from here, we kill the connection */
break;
#ifdef EXTERNAL_POLL
/*
* callbacks for managing the external poll() array appear in
* protocol 0 callback
*/
case LWS_CALLBACK_LOCK_POLL:
/*
* lock mutex to protect pollfd state
* called before any other POLL related callback
*/
break;
case LWS_CALLBACK_UNLOCK_POLL:
/*
* unlock mutex to protect pollfd state when
* called after any other POLL related callback
*/
break;
case LWS_CALLBACK_ADD_POLL_FD:
if (count_pollfds >= max_poll_elements) {
lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
return 1;
}
fd_lookup[pa->fd] = count_pollfds;
pollfds[count_pollfds].fd = pa->fd;
pollfds[count_pollfds].events = pa->events;
pollfds[count_pollfds++].revents = 0;
break;
case LWS_CALLBACK_DEL_POLL_FD:
if (!--count_pollfds)
break;
m = fd_lookup[pa->fd];
/* have the last guy take up the vacant slot */
pollfds[m] = pollfds[count_pollfds];
fd_lookup[pollfds[count_pollfds].fd] = m;
break;
case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
pollfds[fd_lookup[pa->fd]].events = pa->events;
break;
#endif
case LWS_CALLBACK_GET_THREAD_ID:
/*
* if you will call "libwebsocket_callback_on_writable"
* from a different thread, return the caller thread ID
* here so lws can use this information to work out if it
* should signal the poll() loop to exit and restart early
*/
/* return pthread_getthreadid_np(); */
break;
default:
break;
}
return 0;
}
static int
callback_lws_mirror(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
int n;
struct per_session_data__lws_mirror *pss = user;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
fprintf(stderr, "callback_lws_mirror: "
"LWS_CALLBACK_ESTABLISHED\n");
pss->ringbuffer_tail = ringbuffer_head;
pss->wsi = wsi;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
if (close_testing)
break;
if (pss->ringbuffer_tail != ringbuffer_head) {
n = libwebsocket_write(wsi, (unsigned char *)
ringbuffer[pss->ringbuffer_tail].payload +
LWS_SEND_BUFFER_PRE_PADDING,
ringbuffer[pss->ringbuffer_tail].len,
LWS_WRITE_TEXT);
if (n < 0) {
fprintf(stderr, "ERROR writing to socket");
exit(1);
}
if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
pss->ringbuffer_tail = 0;
else
pss->ringbuffer_tail++;
if (((ringbuffer_head - pss->ringbuffer_tail) %
MAX_MESSAGE_QUEUE) < (MAX_MESSAGE_QUEUE - 15))
libwebsocket_rx_flow_control(wsi, 1);
libwebsocket_callback_on_writable(context, wsi);
}
break;
case LWS_CALLBACK_BROADCAST:
n = libwebsocket_write(wsi, in, len, LWS_WRITE_TEXT);
if (n < 0)
fprintf(stderr, "mirror write failed\n");
break;
case LWS_CALLBACK_RECEIVE:
if (ringbuffer[ringbuffer_head].payload)
free(ringbuffer[ringbuffer_head].payload);
ringbuffer[ringbuffer_head].payload =
malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
LWS_SEND_BUFFER_POST_PADDING);
ringbuffer[ringbuffer_head].len = len;
memcpy((char *)ringbuffer[ringbuffer_head].payload +
LWS_SEND_BUFFER_PRE_PADDING, in, len);
if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
ringbuffer_head = 0;
else
ringbuffer_head++;
if (((ringbuffer_head - pss->ringbuffer_tail) %
MAX_MESSAGE_QUEUE) > (MAX_MESSAGE_QUEUE - 10))
libwebsocket_rx_flow_control(wsi, 0);
libwebsocket_callback_on_writable_all_protocol(
libwebsockets_get_protocol(wsi));
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info((struct lws_tokens *)(long)user);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
static int
callback_dumb_increment(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
int n;
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
LWS_SEND_BUFFER_POST_PADDING];
unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
struct per_session_data__dumb_increment *pss = user;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
fprintf(stderr, "callback_dumb_increment: "
"LWS_CALLBACK_ESTABLISHED\n");
pss->number = 0;
break;
/*
* in this protocol, we just use the broadcast action as the chance to
* send our own connection-specific data and ignore the broadcast info
* that is available in the 'in' parameter
*/
case LWS_CALLBACK_BROADCAST:
n = sprintf((char *)p, "%d", pss->number++);
n = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
if (n < 0) {
fprintf(stderr, "ERROR writing to socket");
return 1;
}
if (close_testing && pss->number == 50) {
fprintf(stderr, "close tesing limit, closing\n");
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NORMAL);
}
break;
case LWS_CALLBACK_RECEIVE:
fprintf(stderr, "rx %d\n", (int)len);
if (len < 6)
break;
if (strcmp(in, "reset\n") == 0)
pss->number = 0;
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info((struct lws_tokens *)(long)user);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
int
callback_lws_mirror(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct per_session_data__lws_mirror *pss =
(struct per_session_data__lws_mirror *)user;
int m,n;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("callback_lws_mirror: LWS_CALLBACK_ESTABLISHED\n", __func__);
pss->ringbuffer_tail = ringbuffer_head;
pss->wsi = wsi;
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
lwsl_notice("mirror protocol cleaning up\n");
for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
if (ringbuffer[n].payload)
free(ringbuffer[n].payload);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
if (close_testing)
break;
while (pss->ringbuffer_tail != ringbuffer_head) {
m = ringbuffer[pss->ringbuffer_tail].len;
n = lws_write(wsi, (unsigned char *)
ringbuffer[pss->ringbuffer_tail].payload +
LWS_PRE, m, LWS_WRITE_TEXT);
if (n < 0) {
lwsl_err("ERROR %d writing to mirror socket\n", n);
return -1;
}
if (n < m)
lwsl_err("mirror partial write %d vs %d\n", n, m);
if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
pss->ringbuffer_tail = 0;
else
pss->ringbuffer_tail++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
lws_rx_flow_allow_all_protocol(lws_get_context(wsi),
lws_get_protocol(wsi));
if (lws_send_pipe_choked(wsi)) {
lws_callback_on_writable(wsi);
break;
}
/*
* for tests with chrome on same machine as client and
* server, this is needed to stop chrome choking
*/
usleep(1);
}
break;
case LWS_CALLBACK_RECEIVE:
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
lwsl_err("dropping!\n");
goto choke;
}
if (ringbuffer[ringbuffer_head].payload)
free(ringbuffer[ringbuffer_head].payload);
ringbuffer[ringbuffer_head].payload =
malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
LWS_SEND_BUFFER_POST_PADDING);
ringbuffer[ringbuffer_head].len = len;
memcpy((char *)ringbuffer[ringbuffer_head].payload +
LWS_SEND_BUFFER_PRE_PADDING, in, len);
if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
ringbuffer_head = 0;
else
ringbuffer_head++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
goto done;
choke:
lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
lws_rx_flow_control(wsi, 0);
done:
lws_callback_on_writable_all_protocol(lws_get_context(wsi),
lws_get_protocol(wsi));
const char *ubus_socket = NULL;
struct ubus_context *ctx;
static struct blob_buf b;
ctx = ubus_connect(ubus_socket);
if (!ctx) {
fprintf(stderr, "Failed to connect to ubus\n");
return -1;
}
blob_buf_init(&b, 0);
blobmsg_add_json_from_string(&b, (char *)in);
ubus_send_event(ctx, ubusxevent, b.head);
ubus_free(ctx);
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
int callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
void *in, size_t len)
{
struct per_session_data__http *pss =
(struct per_session_data__http *)user;
unsigned char buffer[4096 + LWS_PRE];
unsigned long amount, file_len, sent;
char leaf_path[1024];
const char *mimetype;
char *other_headers;
unsigned char *end, *start;
struct timeval tv;
unsigned char *p;
#ifndef LWS_NO_CLIENT
struct per_session_data__http *pss1;
struct lws *wsi1;
#endif
char buf[256];
char b64[64];
int n, m;
#ifdef EXTERNAL_POLL
struct lws_pollargs *pa = (struct lws_pollargs *)in;
#endif
switch (reason) {
case LWS_CALLBACK_HTTP:
lwsl_info("lws_http_serve: %s\n",in);
if (debug_level & LLL_INFO) {
dump_handshake_info(wsi);
/* dump the individual URI Arg parameters */
n = 0;
while (lws_hdr_copy_fragment(wsi, buf, sizeof(buf),
WSI_TOKEN_HTTP_URI_ARGS, n) > 0) {
lwsl_notice("URI Arg %d: %s\n", ++n, buf);
}
}
{
lws_get_peer_simple(wsi, buf, sizeof(buf));
lwsl_info("HTTP connect from %s\n", buf);
}
if (len < 1) {
lws_return_http_status(wsi,
HTTP_STATUS_BAD_REQUEST, NULL);
goto try_to_reuse;
}
#ifndef LWS_NO_CLIENT
if (!strncmp(in, "/proxytest", 10)) {
struct lws_client_connect_info i;
char *rootpath = "/";
const char *p = (const char *)in;
if (lws_get_child(wsi))
break;
pss->client_finished = 0;
memset(&i,0, sizeof(i));
i.context = lws_get_context(wsi);
i.address = "git.libwebsockets.org";
i.port = 80;
i.ssl_connection = 0;
if (p[10])
i.path = (char *)in + 10;
else
i.path = rootpath;
i.host = "git.libwebsockets.org";
i.origin = NULL;
i.method = "GET";
i.parent_wsi = wsi;
i.uri_replace_from = "git.libwebsockets.org/";
i.uri_replace_to = "/proxytest/";
if (!lws_client_connect_via_info(&i)) {
lwsl_err("proxy connect fail\n");
break;
}
break;
}
#endif
#if 1
/* this example server has no concept of directories */
if (strchr((const char *)in + 1, '/')) {
lws_return_http_status(wsi, HTTP_STATUS_NOT_ACCEPTABLE, NULL);
goto try_to_reuse;
}
#endif
/* if a legal POST URL, let it continue and accept data */
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
return 0;
/* check for the "send a big file by hand" example case */
if (!strcmp((const char *)in, "/leaf.jpg")) {
if (strlen(resource_path) > sizeof(leaf_path) - 10)
return -1;
sprintf(leaf_path, "%s/leaf.jpg", resource_path);
/* well, let's demonstrate how to send the hard way */
p = buffer + LWS_PRE;
end = p + sizeof(buffer) - LWS_PRE;
pss->fd = lws_plat_file_open(wsi, leaf_path, &file_len,
LWS_O_RDONLY);
if (pss->fd == LWS_INVALID_FILE) {
lwsl_err("failed to open file %s\n", leaf_path);
return -1;
}
/*
* we will send a big jpeg file, but it could be
* anything. Set the Content-Type: appropriately
* so the browser knows what to do with it.
*
* Notice we use the APIs to build the header, which
* will do the right thing for HTTP 1/1.1 and HTTP2
* depending on what connection it happens to be working
* on
*/
if (lws_add_http_header_status(wsi, 200, &p, end))
return 1;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
(unsigned char *)"libwebsockets",
13, &p, end))
return 1;
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"image/jpeg",
10, &p, end))
return 1;
if (lws_add_http_header_content_length(wsi,
file_len, &p,
end))
return 1;
if (lws_finalize_http_header(wsi, &p, end))
return 1;
/*
* send the http headers...
* this won't block since it's the first payload sent
* on the connection since it was established
* (too small for partial)
*
* Notice they are sent using LWS_WRITE_HTTP_HEADERS
* which also means you can't send body too in one step,
* this is mandated by changes in HTTP2
*/
*p = '\0';
lwsl_info("%s\n", buffer + LWS_PRE);
n = lws_write(wsi, buffer + LWS_PRE,
p - (buffer + LWS_PRE),
LWS_WRITE_HTTP_HEADERS);
if (n < 0) {
lws_plat_file_close(wsi, pss->fd);
return -1;
}
/*
* book us a LWS_CALLBACK_HTTP_WRITEABLE callback
*/
lws_callback_on_writable(wsi);
break;
}
/* if not, send a file the easy way */
if (!strncmp(in, "/cgit-data/", 11)) {
in = (char *)in + 11;
strcpy(buf, "/usr/share/cgit");
} else
strcpy(buf, resource_path);
if (strcmp(in, "/")) {
if (*((const char *)in) != '/')
strcat(buf, "/");
strncat(buf, in, sizeof(buf) - strlen(buf) - 1);
} else /* default file to serve */
strcat(buf, "/test.html");
buf[sizeof(buf) - 1] = '\0';
/* refuse to serve files we don't understand */
mimetype = get_mimetype(buf);
if (!mimetype) {
lwsl_err("Unknown mimetype for %s\n", buf);
lws_return_http_status(wsi,
HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
return -1;
}
/* demonstrates how to set a cookie on / */
other_headers = leaf_path;
p = (unsigned char *)leaf_path;
if (!strcmp((const char *)in, "/") &&
!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
/* this isn't very unguessable but it'll do for us */
gettimeofday(&tv, NULL);
n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
(unsigned int)tv.tv_sec,
(unsigned int)tv.tv_usec);
if (lws_add_http_header_by_name(wsi,
(unsigned char *)"set-cookie:",
(unsigned char *)b64, n, &p,
(unsigned char *)leaf_path + sizeof(leaf_path)))
return 1;
}
if (lws_is_ssl(wsi) && lws_add_http_header_by_name(wsi,
(unsigned char *)
"Strict-Transport-Security:",
(unsigned char *)
"max-age=15768000 ; "
"includeSubDomains", 36, &p,
(unsigned char *)leaf_path +
sizeof(leaf_path)))
return 1;
n = (char *)p - leaf_path;
n = lws_serve_http_file(wsi, buf, mimetype, other_headers, n);
if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
return -1; /* error or can't reuse connection: close the socket */
/*
* notice that the sending of the file completes asynchronously,
* we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
* it's done
*/
break;
case LWS_CALLBACK_HTTP_BODY:
/* create the POST argument parser if not already existing */
if (!pss->spa) {
pss->spa = lws_spa_create(wsi, param_names,
ARRAY_SIZE(param_names), 1024,
file_upload_cb, pss);
if (!pss->spa)
return -1;
pss->filename[0] = '\0';
pss->file_length = 0;
}
/* let it parse the POST data */
if (lws_spa_process(pss->spa, in, len))
return -1;
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_debug("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
/*
* the whole of the sent body arrived,
* respond to the client with a redirect to show the
* results
*/
/* call to inform no more payload data coming */
lws_spa_finalize(pss->spa);
p = (unsigned char *)pss->result + LWS_PRE;
end = p + sizeof(pss->result) - LWS_PRE - 1;
p += sprintf((char *)p,
"<html><body><h1>Form results (after urldecoding)</h1>"
"<table><tr><td>Name</td><td>Length</td><td>Value</td></tr>");
for (n = 0; n < ARRAY_SIZE(param_names); n++)
p += lws_snprintf((char *)p, end - p,
"<tr><td><b>%s</b></td><td>%d</td><td>%s</td></tr>",
param_names[n],
lws_spa_get_length(pss->spa, n),
lws_spa_get_string(pss->spa, n));
p += lws_snprintf((char *)p, end - p, "</table><br><b>filename:</b> %s, <b>length</b> %ld",
pss->filename, pss->file_length);
p += lws_snprintf((char *)p, end - p, "</body></html>");
pss->result_len = p - (unsigned char *)(pss->result + LWS_PRE);
p = buffer + LWS_PRE;
start = p;
end = p + sizeof(buffer) - LWS_PRE;
if (lws_add_http_header_status(wsi, 200, &p, end))
return 1;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"text/html", 9, &p, end))
return 1;
if (lws_add_http_header_content_length(wsi, pss->result_len, &p, end))
return 1;
if (lws_finalize_http_header(wsi, &p, end))
return 1;
n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS);
if (n < 0)
return 1;
n = lws_write(wsi, (unsigned char *)pss->result + LWS_PRE,
pss->result_len, LWS_WRITE_HTTP);
if (n < 0)
return 1;
goto try_to_reuse;
case LWS_CALLBACK_HTTP_DROP_PROTOCOL:
lwsl_debug("LWS_CALLBACK_HTTP_DROP_PROTOCOL\n");
/* called when our wsi user_space is going to be destroyed */
if (pss->spa) {
lws_spa_destroy(pss->spa);
pss->spa = NULL;
}
break;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
goto try_to_reuse;
case LWS_CALLBACK_HTTP_WRITEABLE:
lwsl_info("LWS_CALLBACK_HTTP_WRITEABLE\n");
if (pss->client_finished)
return -1;
if (pss->fd == LWS_INVALID_FILE)
goto try_to_reuse;
#ifndef LWS_NO_CLIENT
if (pss->reason_bf & 2) {
char *px = buf + LWS_PRE;
int lenx = sizeof(buf) - LWS_PRE;
/*
* our sink is writeable and our source has something
* to read. So read a lump of source material of
* suitable size to send or what's available, whichever
* is the smaller.
*/
pss->reason_bf &= ~2;
wsi1 = lws_get_child(wsi);
if (!wsi1)
break;
if (lws_http_client_read(wsi1, &px, &lenx) < 0)
goto bail;
if (pss->client_finished)
return -1;
break;
}
#endif
/*
* we can send more of whatever it is we were sending
*/
sent = 0;
do {
/* we'd like the send this much */
n = sizeof(buffer) - LWS_PRE;
/* but if the peer told us he wants less, we can adapt */
m = lws_get_peer_write_allowance(wsi);
/* -1 means not using a protocol that has this info */
if (m == 0)
/* right now, peer can't handle anything */
goto later;
if (m != -1 && m < n)
/* he couldn't handle that much */
n = m;
n = lws_plat_file_read(wsi, pss->fd,
&amount, buffer + LWS_PRE, n);
/* problem reading, close conn */
if (n < 0) {
lwsl_err("problem reading file\n");
goto bail;
}
n = (int)amount;
/* sent it all, close conn */
if (n == 0)
goto penultimate;
/*
* To support HTTP2, must take care about preamble space
*
* identification of when we send the last payload frame
* is handled by the library itself if you sent a
* content-length header
*/
m = lws_write(wsi, buffer + LWS_PRE, n, LWS_WRITE_HTTP);
if (m < 0) {
lwsl_err("write failed\n");
/* write failed, close conn */
goto bail;
}
if (m) /* while still active, extend timeout */
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, 5);
sent += m;
} while (!lws_send_pipe_choked(wsi) && (sent < 1024 * 1024));
later:
lws_callback_on_writable(wsi);
break;
penultimate:
lws_plat_file_close(wsi, pss->fd);
pss->fd = LWS_INVALID_FILE;
goto try_to_reuse;
bail:
lws_plat_file_close(wsi, pss->fd);
return -1;
/*
* callback for confirming to continue with client IP appear in
* protocol 0 callback since no websocket protocol has been agreed
* yet. You can just ignore this if you won't filter on client IP
* since the default unhandled callback return is 0 meaning let the
* connection continue.
*/
case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
/* if we returned non-zero from here, we kill the connection */
break;
#ifndef LWS_NO_CLIENT
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: {
char ctype[64], ctlen = 0;
lwsl_err("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP\n");
p = buffer + LWS_PRE;
end = p + sizeof(buffer) - LWS_PRE;
if (lws_add_http_header_status(lws_get_parent(wsi), 200, &p, end))
return 1;
if (lws_add_http_header_by_token(lws_get_parent(wsi),
WSI_TOKEN_HTTP_SERVER,
(unsigned char *)"libwebsockets",
13, &p, end))
return 1;
ctlen = lws_hdr_copy(wsi, ctype, sizeof(ctype), WSI_TOKEN_HTTP_CONTENT_TYPE);
if (ctlen > 0) {
if (lws_add_http_header_by_token(lws_get_parent(wsi),
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)ctype, ctlen, &p, end))
return 1;
}
#if 0
if (lws_add_http_header_content_length(lws_get_parent(wsi),
file_len, &p, end))
return 1;
#endif
if (lws_finalize_http_header(lws_get_parent(wsi), &p, end))
return 1;
*p = '\0';
lwsl_info("%s\n", buffer + LWS_PRE);
n = lws_write(lws_get_parent(wsi), buffer + LWS_PRE,
p - (buffer + LWS_PRE),
LWS_WRITE_HTTP_HEADERS);
if (n < 0)
return -1;
break; }
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
//lwsl_err("LWS_CALLBACK_CLOSED_CLIENT_HTTP\n");
return -1;
break;
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
//lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p\n", wsi);
assert(lws_get_parent(wsi));
if (!lws_get_parent(wsi))
break;
// lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP: wsi %p: sock: %d, parent_wsi: %p, parent_sock:%d, len %d\n",
// wsi, lws_get_socket_fd(wsi),
// lws_get_parent(wsi),
// lws_get_socket_fd(lws_get_parent(wsi)), len);
pss1 = lws_wsi_user(lws_get_parent(wsi));
pss1->reason_bf |= 2;
lws_callback_on_writable(lws_get_parent(wsi));
break;
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
//lwsl_err("LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ len %d\n", len);
assert(lws_get_parent(wsi));
m = lws_write(lws_get_parent(wsi), (unsigned char *)in,
len, LWS_WRITE_HTTP);
if (m < 0)
return -1;
break;
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
//lwsl_err("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n");
assert(lws_get_parent(wsi));
if (!lws_get_parent(wsi))
break;
pss1 = lws_wsi_user(lws_get_parent(wsi));
pss1->client_finished = 1;
break;
#endif
/*
* callbacks for managing the external poll() array appear in
* protocol 0 callback
*/
case LWS_CALLBACK_LOCK_POLL:
/*
* lock mutex to protect pollfd state
* called before any other POLL related callback
* if protecting wsi lifecycle change, len == 1
*/
test_server_lock(len);
break;
case LWS_CALLBACK_UNLOCK_POLL:
/*
* unlock mutex to protect pollfd state when
* called after any other POLL related callback
* if protecting wsi lifecycle change, len == 1
*/
test_server_unlock(len);
break;
#ifdef EXTERNAL_POLL
case LWS_CALLBACK_ADD_POLL_FD:
if (count_pollfds >= max_poll_elements) {
lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
return 1;
}
fd_lookup[pa->fd] = count_pollfds;
pollfds[count_pollfds].fd = pa->fd;
pollfds[count_pollfds].events = pa->events;
pollfds[count_pollfds++].revents = 0;
break;
case LWS_CALLBACK_DEL_POLL_FD:
if (!--count_pollfds)
break;
m = fd_lookup[pa->fd];
/* have the last guy take up the vacant slot */
pollfds[m] = pollfds[count_pollfds];
fd_lookup[pollfds[count_pollfds].fd] = m;
break;
case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
pollfds[fd_lookup[pa->fd]].events = pa->events;
break;
#endif
case LWS_CALLBACK_GET_THREAD_ID:
/*
* if you will call "lws_callback_on_writable"
* from a different thread, return the caller thread ID
* here so lws can use this information to work out if it
* should signal the poll() loop to exit and restart early
*/
/* return pthread_getthreadid_np(); */
break;
#if defined(LWS_USE_POLARSSL)
#else
#if defined(LWS_USE_MBEDTLS)
#else
#if defined(LWS_OPENSSL_SUPPORT)
case LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION:
/* Verify the client certificate */
if (!len || (SSL_get_verify_result((SSL*)in) != X509_V_OK)) {
int err = X509_STORE_CTX_get_error((X509_STORE_CTX*)user);
int depth = X509_STORE_CTX_get_error_depth((X509_STORE_CTX*)user);
const char* msg = X509_verify_cert_error_string(err);
lwsl_err("LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION: SSL error: %s (%d), depth: %d\n", msg, err, depth);
return 1;
}
break;
#if defined(LWS_HAVE_SSL_CTX_set1_param)
case LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS:
if (crl_path[0]) {
/* Enable CRL checking */
X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new();
X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
SSL_CTX_set1_param((SSL_CTX*)user, param);
X509_STORE *store = SSL_CTX_get_cert_store((SSL_CTX*)user);
X509_LOOKUP *lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
n = X509_load_cert_crl_file(lookup, crl_path, X509_FILETYPE_PEM);
X509_VERIFY_PARAM_free(param);
if (n != 1) {
char errbuf[256];
n = ERR_get_error();
lwsl_err("LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: SSL error: %s (%d)\n", ERR_error_string(n, errbuf), n);
return 1;
}
}
break;
#endif
#endif
#endif
#endif
default:
break;
}
return 0;
/* if we're on HTTP1.1 or 2.0, will keep the idle connection alive */
try_to_reuse:
if (lws_http_transaction_completed(wsi))
return -1;
return 0;
}
int
callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
unsigned char buf[LWS_PRE + 512];
struct per_session_data__dumb_increment *pss =
(struct per_session_data__dumb_increment *)user;
unsigned char *p = &buf[LWS_PRE];
int n, m;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
pss->number = 0;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
n = sprintf((char *)p, "%d", pss->number++);
m = lws_write(wsi, p, n, LWS_WRITE_TEXT);
if (m < n) {
lwsl_err("ERROR %d writing to di socket\n", n);
return -1;
}
if (close_testing && pss->number == 50) {
lwsl_info("close tesing limit, closing\n");
return -1;
}
break;
case LWS_CALLBACK_RECEIVE:
if (len < 6)
break;
if (strcmp((const char *)in, "reset\n") == 0)
pss->number = 0;
if (strcmp((const char *)in, "closeme\n") == 0) {
lwsl_notice("dumb_inc: closing as requested\n");
lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
(unsigned char *)"seeya", 5);
return -1;
}
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
/*
* this just demonstrates how to handle
* LWS_CALLBACK_WS_PEER_INITIATED_CLOSE and extract the peer's close
* code and auxiliary data. You can just not handle it if you don't
* have a use for this.
*/
case LWS_CALLBACK_WS_PEER_INITIATED_CLOSE:
lwsl_notice("LWS_CALLBACK_WS_PEER_INITIATED_CLOSE: len %lu\n",
(unsigned long)len);
for (n = 0; n < (int)len; n++)
lwsl_notice(" %d: 0x%02X\n", n,
((unsigned char *)in)[n]);
break;
default:
break;
}
return 0;
}
int callback_jittertrap(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in,
size_t len __attribute__((unused)))
{
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_JSON_MSG_LEN +
LWS_SEND_BUFFER_POST_PADDING];
unsigned char *p = &buf[LWS_SEND_BUFFER_PRE_PADDING];
struct per_session_data__jittertrap *pss =
(struct per_session_data__jittertrap *)user;
int err, cb_err;
struct cb_data cbd = { wsi, p };
/* run jt init, stats producer, etc. */
jt_server_tick();
switch (reason) {
case LWS_CALLBACK_CLOSED:
err = jt_ws_mq_consumer_unsubscribe(pss->consumer_id);
if (err) {
lwsl_err("mq consumer unsubscribe failed.\n");
}
break;
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("callback_jt: "
"LWS_CALLBACK_ESTABLISHED\n");
err = jt_ws_mq_consumer_subscribe(&(pss->consumer_id));
if (err) {
lwsl_err("mq consumer subscription failed.\n");
}
jt_srv_send_iface_list();
jt_srv_send_select_iface();
jt_srv_send_netem_params();
jt_srv_send_sample_period();
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
do {
err = jt_ws_mq_consume(pss->consumer_id, lws_writer,
&cbd, &cb_err);
if (lws_partial_buffered(wsi) ||
lws_send_pipe_choked(wsi)) {
lws_callback_on_writable(wsi);
break;
}
} while (!err);
if (-JT_WS_MQ_EMPTY != err) {
return err;
}
break;
case LWS_CALLBACK_RECEIVE:
jt_server_msg_receive(in);
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
int
callback_lws_mirror(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct per_session_data__lws_mirror *pss =
(struct per_session_data__lws_mirror *)user;
int n, m;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
lwsl_info("%s: LWS_CALLBACK_ESTABLISHED\n", __func__);
pss->ringbuffer_tail = ringbuffer_head;
pss->wsi = wsi;
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
lwsl_notice("%s: mirror protocol cleaning up\n", __func__);
for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
if (ringbuffer[n].payload)
free(ringbuffer[n].payload);
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
if (close_testing)
break;
while (pss->ringbuffer_tail != ringbuffer_head) {
m = ringbuffer[pss->ringbuffer_tail].len;
n = lws_write(wsi, (unsigned char *)
ringbuffer[pss->ringbuffer_tail].payload +
LWS_PRE, m, LWS_WRITE_TEXT);
if (n < 0) {
lwsl_err("ERROR %d writing to mirror socket\n", n);
return -1;
}
if (n < m)
lwsl_err("mirror partial write %d vs %d\n", n, m);
if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
pss->ringbuffer_tail = 0;
else
pss->ringbuffer_tail++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
lws_rx_flow_allow_all_protocol(lws_get_context(wsi),
lws_get_protocol(wsi));
if (lws_send_pipe_choked(wsi)) {
lws_callback_on_writable(wsi);
break;
}
}
break;
case LWS_CALLBACK_RECEIVE:
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
lwsl_err("dropping!\n");
goto choke;
}
if (ringbuffer[ringbuffer_head].payload)
free(ringbuffer[ringbuffer_head].payload);
ringbuffer[ringbuffer_head].payload = malloc(LWS_PRE + len);
ringbuffer[ringbuffer_head].len = len;
memcpy((char *)ringbuffer[ringbuffer_head].payload +
LWS_PRE, in, len);
if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
ringbuffer_head = 0;
else
ringbuffer_head++;
if (((ringbuffer_head - pss->ringbuffer_tail) &
(MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
goto done;
choke:
lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
lws_rx_flow_control(wsi, 0);
done:
lws_callback_on_writable_all_protocol(lws_get_context(wsi),
lws_get_protocol(wsi));
break;
/*
* this just demonstrates how to use the protocol filter. If you won't
* study and reject connections based on header content, you don't need
* to handle this callback
*/
case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
dump_handshake_info(wsi);
/* you could return non-zero here and kill the connection */
break;
default:
break;
}
return 0;
}
static int callback_http(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user,
void *in,
size_t len)
{
(void)user;
char buf[256];
char leaf_path[1024];
char b64[64];
struct timeval tv;
char *other_headers;
const char *mimetype;
switch (reason) {
case LWS_CALLBACK_HTTP:
dump_handshake_info(wsi);
if (len < 1) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_BAD_REQUEST, NULL);
return -1;
}
/* this server has no concept of directories */
if (strchr((const char *)in + 1, '/')) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_FORBIDDEN, NULL);
return -1;
}
/* if a legal POST URL, let it continue and accept data */
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
return 0;
/* if not, send a file the easy way */
strcpy(buf, resource_path);
if (strcmp((const char*)in, "/")) {
strcat(buf, "/");
strncat(buf, (char*)in, sizeof(buf) - strlen(resource_path));
}else{ /* default file to serve */
strcat(buf, "/monitor.html");
}
buf[sizeof(buf) - 1] = '\0';
/* refuse to serve files we don't understand */
mimetype = get_mimetype(buf);
if (!mimetype) {
lwsl_err("Unknown mimetype for %s\n", buf);
libwebsockets_return_http_status(context, wsi, HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
return -1;
}
/* demostrates how to set a cookie on / */
other_headers = NULL;
if (!strcmp((const char *)in, "/") &&
!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
/* this isn't very unguessable but it'll do for us */
gettimeofday(&tv, NULL);
sprintf(b64, "LWS_%u_%u_COOKIE",
(unsigned int)tv.tv_sec,
(unsigned int)tv.tv_usec);
sprintf(leaf_path,
"Set-Cookie: test=LWS_%u_%u_COOKIE;Max-Age=360000\x0d\x0a",
(unsigned int)tv.tv_sec, (unsigned int)tv.tv_usec);
other_headers = leaf_path;
lwsl_err(other_headers);
}
if (libwebsockets_serve_http_file(context, wsi, buf, mimetype, other_headers)){
return -1; /* through completion or error, close the socket */
}
break;
case LWS_CALLBACK_HTTP_BODY:
strncpy(buf, (char*)in, 20);
buf[20] = '\0';
if (len < 20)
buf[len] = '\0';
lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
(const char *)buf, (int)len);
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
/* the whole of the sent body arried, close the connection */
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_OK, NULL);
return -1;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
/* kill the connection after we sent one file */
return -1;
case LWS_CALLBACK_HTTP_WRITEABLE:
return -1;
/*
* callback for confirming to continue with client IP appear in
* protocol 0 callback since no websocket protocol has been agreed
* yet. You can just ignore this if you won't filter on client IP
* since the default uhandled callback return is 0 meaning let the
* connection continue.
*/
case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
#if 0
libwebsockets_get_peer_addresses(context, wsi, (int)(long)in, client_name,
sizeof(client_name), client_ip, sizeof(client_ip));
fprintf(stderr, "Received network connect from %s (%s)\n",
client_name, client_ip);
#endif
/* if we returned non-zero from here, we kill the connection */
break;
case LWS_CALLBACK_GET_THREAD_ID:
/*
* if you will call "libwebsocket_callback_on_writable"
* from a different thread, return the caller thread ID
* here so lws can use this information to work out if it
* should signal the poll() loop to exit and restart early
*/
/* return pthread_getthreadid_np(); */
break;
default:
break;
}
return 0;
}
static int callback_http(struct libwebsocket_context *context,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason, void *user,
void *in, size_t len)
{
char buf[256];
char leaf_path[1024];
char b64[64];
struct timeval tv;
int n, m;
unsigned char *p;
char *other_headers;
static unsigned char buffer[4096];
struct stat stat_buf;
struct per_session_data__http *pss =
(struct per_session_data__http *)user;
const char *mimetype;
#ifdef EXTERNAL_POLL
struct libwebsocket_pollargs *pa = (struct libwebsocket_pollargs *)in;
#endif
unsigned char *end;
switch (reason) {
case LWS_CALLBACK_HTTP:
dump_handshake_info(wsi);
if (len < 1) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_BAD_REQUEST, NULL);
goto try_to_reuse;
}
/* this example server has no concept of directories */
if (strchr((const char *)in + 1, '/')) {
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_FORBIDDEN, NULL);
goto try_to_reuse;
}
/* if a legal POST URL, let it continue and accept data */
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI))
return 0;
/* check for the "send a big file by hand" example case */
if (!strcmp((const char *)in, "/leaf.jpg")) {
if (strlen(resource_path) > sizeof(leaf_path) - 10)
return -1;
sprintf(leaf_path, "%s/leaf.jpg", resource_path);
/* well, let's demonstrate how to send the hard way */
p = buffer + LWS_SEND_BUFFER_PRE_PADDING;
end = p + sizeof(buffer) - LWS_SEND_BUFFER_PRE_PADDING;
#ifdef WIN32
pss->fd = open(leaf_path, O_RDONLY | _O_BINARY);
#else
pss->fd = open(leaf_path, O_RDONLY);
#endif
if (pss->fd < 0)
return -1;
if (fstat(pss->fd, &stat_buf) < 0)
return -1;
/*
* we will send a big jpeg file, but it could be
* anything. Set the Content-Type: appropriately
* so the browser knows what to do with it.
*
* Notice we use the APIs to build the header, which
* will do the right thing for HTTP 1/1.1 and HTTP2
* depending on what connection it happens to be working
* on
*/
if (lws_add_http_header_status(context, wsi, 200, &p, end))
return 1;
if (lws_add_http_header_by_token(context, wsi,
WSI_TOKEN_HTTP_SERVER,
(unsigned char *)"libwebsockets",
13, &p, end))
return 1;
if (lws_add_http_header_by_token(context, wsi,
WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"image/jpeg",
10, &p, end))
return 1;
if (lws_add_http_header_content_length(context, wsi,
stat_buf.st_size, &p, end))
return 1;
if (lws_finalize_http_header(context, wsi, &p, end))
return 1;
/*
* send the http headers...
* this won't block since it's the first payload sent
* on the connection since it was established
* (too small for partial)
*
* Notice they are sent using LWS_WRITE_HTTP_HEADERS
* which also means you can't send body too in one step,
* this is mandated by changes in HTTP2
*/
n = libwebsocket_write(wsi,
buffer + LWS_SEND_BUFFER_PRE_PADDING,
p - (buffer + LWS_SEND_BUFFER_PRE_PADDING),
LWS_WRITE_HTTP_HEADERS);
if (n < 0) {
close(pss->fd);
return -1;
}
/*
* book us a LWS_CALLBACK_HTTP_WRITEABLE callback
*/
libwebsocket_callback_on_writable(context, wsi);
break;
}
/* if not, send a file the easy way */
strcpy(buf, resource_path);
if (strcmp(in, "/")) {
if (*((const char *)in) != '/')
strcat(buf, "/");
strncat(buf, in, sizeof(buf) - strlen(resource_path));
} else /* default file to serve */
strcat(buf, "/test.html");
buf[sizeof(buf) - 1] = '\0';
/* refuse to serve files we don't understand */
mimetype = get_mimetype(buf);
if (!mimetype) {
lwsl_err("Unknown mimetype for %s\n", buf);
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE, NULL);
return -1;
}
/* demostrates how to set a cookie on / */
other_headers = NULL;
n = 0;
if (!strcmp((const char *)in, "/") &&
!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COOKIE)) {
/* this isn't very unguessable but it'll do for us */
gettimeofday(&tv, NULL);
n = sprintf(b64, "test=LWS_%u_%u_COOKIE;Max-Age=360000",
(unsigned int)tv.tv_sec,
(unsigned int)tv.tv_usec);
p = (unsigned char *)leaf_path;
if (lws_add_http_header_by_name(context, wsi,
(unsigned char *)"set-cookie:",
(unsigned char *)b64, n, &p,
(unsigned char *)leaf_path + sizeof(leaf_path)))
return 1;
n = (char *)p - leaf_path;
other_headers = leaf_path;
}
n = libwebsockets_serve_http_file(context, wsi, buf,
mimetype, other_headers, n);
if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
return -1; /* error or can't reuse connection: close the socket */
/*
* notice that the sending of the file completes asynchronously,
* we'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
* it's done
*/
break;
case LWS_CALLBACK_HTTP_BODY:
strncpy(buf, in, 20);
buf[20] = '\0';
if (len < 20)
buf[len] = '\0';
lwsl_notice("LWS_CALLBACK_HTTP_BODY: %s... len %d\n",
(const char *)buf, (int)len);
break;
case LWS_CALLBACK_HTTP_BODY_COMPLETION:
lwsl_notice("LWS_CALLBACK_HTTP_BODY_COMPLETION\n");
/* the whole of the sent body arrived, close or reuse the connection */
libwebsockets_return_http_status(context, wsi,
HTTP_STATUS_OK, NULL);
goto try_to_reuse;
case LWS_CALLBACK_HTTP_FILE_COMPLETION:
// lwsl_info("LWS_CALLBACK_HTTP_FILE_COMPLETION seen\n");
/* kill the connection after we sent one file */
goto try_to_reuse;
case LWS_CALLBACK_HTTP_WRITEABLE:
/*
* we can send more of whatever it is we were sending
*/
do {
/* we'd like the send this much */
n = sizeof(buffer) - LWS_SEND_BUFFER_PRE_PADDING;
/* but if the peer told us he wants less, we can adapt */
m = lws_get_peer_write_allowance(wsi);
/* -1 means not using a protocol that has this info */
if (m == 0)
/* right now, peer can't handle anything */
goto later;
if (m != -1 && m < n)
/* he couldn't handle that much */
n = m;
n = read(pss->fd, buffer + LWS_SEND_BUFFER_PRE_PADDING,
n);
/* problem reading, close conn */
if (n < 0)
goto bail;
/* sent it all, close conn */
if (n == 0)
goto flush_bail;
/*
* To support HTTP2, must take care about preamble space
*
* identification of when we send the last payload frame
* is handled by the library itself if you sent a
* content-length header
*/
m = libwebsocket_write(wsi,
buffer + LWS_SEND_BUFFER_PRE_PADDING,
n, LWS_WRITE_HTTP);
if (m < 0)
/* write failed, close conn */
goto bail;
/*
* http2 won't do this
*/
if (m != n)
/* partial write, adjust */
if (lseek(pss->fd, m - n, SEEK_CUR) < 0)
goto bail;
if (m) /* while still active, extend timeout */
libwebsocket_set_timeout(wsi,
PENDING_TIMEOUT_HTTP_CONTENT, 5);
/* if we have indigestion, let him clear it before eating more */
if (lws_partial_buffered(wsi))
break;
} while (!lws_send_pipe_choked(wsi));
later:
libwebsocket_callback_on_writable(context, wsi);
break;
flush_bail:
/* true if still partial pending */
if (lws_partial_buffered(wsi)) {
libwebsocket_callback_on_writable(context, wsi);
break;
}
close(pss->fd);
goto try_to_reuse;
bail:
close(pss->fd);
return -1;
/*
* callback for confirming to continue with client IP appear in
* protocol 0 callback since no websocket protocol has been agreed
* yet. You can just ignore this if you won't filter on client IP
* since the default uhandled callback return is 0 meaning let the
* connection continue.
*/
case LWS_CALLBACK_FILTER_NETWORK_CONNECTION:
/* if we returned non-zero from here, we kill the connection */
break;
#ifdef EXTERNAL_POLL
/*
* callbacks for managing the external poll() array appear in
* protocol 0 callback
*/
case LWS_CALLBACK_LOCK_POLL:
/*
* lock mutex to protect pollfd state
* called before any other POLL related callback
*/
break;
case LWS_CALLBACK_UNLOCK_POLL:
/*
* unlock mutex to protect pollfd state when
* called after any other POLL related callback
*/
break;
case LWS_CALLBACK_ADD_POLL_FD:
if (count_pollfds >= max_poll_elements) {
lwsl_err("LWS_CALLBACK_ADD_POLL_FD: too many sockets to track\n");
return 1;
}
fd_lookup[pa->fd] = count_pollfds;
pollfds[count_pollfds].fd = pa->fd;
pollfds[count_pollfds].events = pa->events;
pollfds[count_pollfds++].revents = 0;
break;
case LWS_CALLBACK_DEL_POLL_FD:
if (!--count_pollfds)
break;
m = fd_lookup[pa->fd];
/* have the last guy take up the vacant slot */
pollfds[m] = pollfds[count_pollfds];
fd_lookup[pollfds[count_pollfds].fd] = m;
break;
case LWS_CALLBACK_CHANGE_MODE_POLL_FD:
pollfds[fd_lookup[pa->fd]].events = pa->events;
break;
#endif
case LWS_CALLBACK_GET_THREAD_ID:
/*
* if you will call "libwebsocket_callback_on_writable"
* from a different thread, return the caller thread ID
* here so lws can use this information to work out if it
* should signal the poll() loop to exit and restart early
*/
/* return pthread_getthreadid_np(); */
break;
default:
break;
}
return 0;
try_to_reuse:
if (lws_http_transaction_completed(wsi))
return -1;
return 0;
}
