/*
* libwebsockets - small server side websockets and web server implementation
- *
+ *
* Copyright (C) 2010 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
#include "private-libwebsockets.h"
+#ifdef WIN32
+
+#else
+#include <ifaddrs.h>
+#include <sys/un.h>
+#endif
+
#ifdef LWS_OPENSSL_SUPPORT
-SSL_CTX *ssl_ctx;
-int use_ssl;
+int openssl_websocket_private_data_index;
#endif
+/*
+ * In-place str to lower case
+ */
+
+static void
+strtolower(char *s)
+{
+ while (*s) {
+ *s = tolower(*s);
+ s++;
+ }
+}
+
+/* file descriptor hash management */
-extern int
-libwebsocket_read(struct libwebsocket *wsi, unsigned char * buf, size_t len);
+struct libwebsocket *
+wsi_from_fd(struct libwebsocket_context *context, int fd)
+{
+ int h = LWS_FD_HASH(fd);
+ int n = 0;
+ for (n = 0; n < context->fd_hashtable[h].length; n++)
+ if (context->fd_hashtable[h].wsi[n]->sock == fd)
+ return context->fd_hashtable[h].wsi[n];
-/* document the generic callback (it's a fake prototype under this) */
-/**
- * callback() - User server actions
- * @wsi: Opaque websocket instance pointer
- * @reason: The reason for the call
- * @user: Pointer to per-session user data allocated by library
- * @in: Pointer used for some callback reasons
- * @len: Length set for some callback reasons
- *
- * This callback is the way the user controls what is served. All the
- * protocol detail is hidden and handled by the library.
- *
- * For each connection / session there is user data allocated that is
- * pointed to by "user". You set the size of this user data area when
- * the library is initialized with libwebsocket_create_server.
- *
- * You get an opportunity to initialize user data when called back with
- * LWS_CALLBACK_ESTABLISHED reason.
- *
- * LWS_CALLBACK_ESTABLISHED: after successful websocket handshake
- *
- * LWS_CALLBACK_CLOSED: when the websocket session ends
- *
- * LWS_CALLBACK_BROADCAST: signal to send to client (you would use
- * libwebsocket_write() taking care about the
- * special buffer requirements
- * LWS_CALLBACK_RECEIVE: data has appeared for the server, it can be
- * found at *in and is len bytes long
- *
- * LWS_CALLBACK_HTTP: an http request has come from a client that is not
- * asking to upgrade the connection to a websocket
- * one. This is a chance to serve http content,
- * for example, to send a script to the client
- * which will then open the websockets connection.
- * @in points to the URI path requested and
- * libwebsockets_serve_http_file() makes it very
- * simple to send back a file to the client.
- */
-extern int callback(struct libwebsocket * wsi,
- enum libwebsocket_callback_reasons reason, void * user,
- void *in, size_t len);
+ return NULL;
+}
+
+int
+insert_wsi(struct libwebsocket_context *context, struct libwebsocket *wsi)
+{
+ int h = LWS_FD_HASH(wsi->sock);
+
+ if (context->fd_hashtable[h].length == MAX_CLIENTS - 1) {
+ fprintf(stderr, "hash table overflow\n");
+ return 1;
+ }
+
+ context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;
+
+ return 0;
+}
+
+int
+delete_from_fd(struct libwebsocket_context *context, int fd)
+{
+ int h = LWS_FD_HASH(fd);
+ int n = 0;
+
+ for (n = 0; n < context->fd_hashtable[h].length; n++)
+ if (context->fd_hashtable[h].wsi[n]->sock == fd) {
+ while (n < context->fd_hashtable[h].length) {
+ context->fd_hashtable[h].wsi[n] =
+ context->fd_hashtable[h].wsi[n + 1];
+ n++;
+ }
+ context->fd_hashtable[h].length--;
+
+ return 0;
+ }
+
+ fprintf(stderr, "Failed to find fd %d requested for "
+ "delete in hashtable\n", fd);
+ return 1;
+}
+
+#ifdef LWS_OPENSSL_SUPPORT
+static void
+libwebsockets_decode_ssl_error(void)
+{
+ char buf[256];
+ u_long err;
+
+ while ((err = ERR_get_error()) != 0) {
+ ERR_error_string_n(err, buf, sizeof(buf));
+ fprintf(stderr, "*** %s\n", buf);
+ }
+}
+#endif
+
+
+static int
+interface_to_sa(const char* ifname, struct sockaddr_in *addr, size_t addrlen)
+{
+ int rc = -1;
+#ifdef WIN32
+ // TODO
+#else
+ struct ifaddrs *ifr;
+ struct ifaddrs *ifc;
+ struct sockaddr_in *sin;
+
+ getifaddrs(&ifr);
+ for (ifc = ifr; ifc != NULL; ifc = ifc->ifa_next) {
+ if (strcmp(ifc->ifa_name, ifname))
+ continue;
+ if (ifc->ifa_addr == NULL)
+ continue;
+ sin = (struct sockaddr_in *)ifc->ifa_addr;
+ if (sin->sin_family != AF_INET)
+ continue;
+ memcpy(addr, sin, addrlen);
+ rc = 0;
+ }
+ freeifaddrs(ifr);
+#endif
+ return rc;
+}
-void
-libwebsocket_close_and_free_session(struct libwebsocket *wsi)
+void
+libwebsocket_close_and_free_session(struct libwebsocket_context *context,
+ struct libwebsocket *wsi, enum lws_close_status reason)
{
int n;
+ int old_state;
+ unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
+ LWS_SEND_BUFFER_POST_PADDING];
+ int ret;
+ int m;
+ struct lws_tokens eff_buf;
+ struct libwebsocket_extension *ext;
+
+ if (!wsi)
+ return;
+
+ old_state = wsi->state;
- if ((unsigned long)wsi < LWS_MAX_PROTOCOLS)
+ if (old_state == WSI_STATE_DEAD_SOCKET)
return;
- n = wsi->state;
+ wsi->close_reason = reason;
+
+ /*
+ * are his extensions okay with him closing? Eg he might be a mux
+ * parent and just his ch1 aspect is closing?
+ */
+
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ if (!wsi->active_extensions[n]->callback)
+ continue;
+
+ m = wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE,
+ wsi->active_extensions_user[n], NULL, 0);
+
+ /*
+ * if somebody vetoed actually closing him at this time....
+ * up to the extension to track the attempted close, let's
+ * just bail
+ */
+
+ if (m) {
+ debug("extension vetoed close\n");
+ return;
+ }
+ }
+
+
+
+ /*
+ * flush any tx pending from extensions, since we may send close packet
+ * if there are problems with send, just nuke the connection
+ */
+
+ ret = 1;
+ while (ret == 1) {
+
+ /* default to nobody has more to spill */
+
+ ret = 0;
+ eff_buf.token = NULL;
+ eff_buf.token_len = 0;
+
+ /* show every extension the new incoming data */
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ m = wsi->active_extensions[n]->callback(
+ wsi->protocol->owning_server,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_FLUSH_PENDING_TX,
+ wsi->active_extensions_user[n], &eff_buf, 0);
+ if (m < 0) {
+ fprintf(stderr, "Extension reports "
+ "fatal error\n");
+ goto just_kill_connection;
+ }
+ if (m)
+ /*
+ * at least one extension told us he has more
+ * to spill, so we will go around again after
+ */
+ ret = 1;
+ }
+
+ /* assuming they left us something to send, send it */
+
+ if (eff_buf.token_len)
+ if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
+ eff_buf.token_len))
+ goto just_kill_connection;
+ }
+
+ /*
+ * signal we are closing, libsocket_write will
+ * add any necessary version-specific stuff. If the write fails,
+ * no worries we are closing anyway. If we didn't initiate this
+ * close, then our state has been changed to
+ * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
+ *
+ * Likewise if it's a second call to close this connection after we
+ * sent the close indication to the peer already, we are in state
+ * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
+ */
+
+ if (old_state == WSI_STATE_ESTABLISHED &&
+ reason != LWS_CLOSE_STATUS_NOSTATUS) {
+
+ debug("sending close indication...\n");
+
+ n = libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING],
+ 0, LWS_WRITE_CLOSE);
+ if (!n) {
+ /*
+ * we have sent a nice protocol level indication we
+ * now wish to close, we should not send anything more
+ */
+
+ wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
+
+ /* and we should wait for a reply for a bit */
+
+ libwebsocket_set_timeout(wsi,
+ PENDING_TIMEOUT_CLOSE_ACK, 5);
+
+ debug("sent close indication, awaiting ack\n");
+
+ return;
+ }
+
+ /* else, the send failed and we should just hang up */
+ }
+
+just_kill_connection:
+
+ debug("libwebsocket_close_and_free_session: just_kill_connection\n");
+
+ /*
+ * we won't be servicing or receiving anything further from this guy
+ * remove this fd from wsi mapping hashtable
+ */
+
+ if (wsi->sock)
+ delete_from_fd(context, wsi->sock);
+
+ /* delete it from the internal poll list if still present */
+
+ for (n = 0; n < context->fds_count; n++) {
+ if (context->fds[n].fd != wsi->sock)
+ continue;
+ while (n < context->fds_count - 1) {
+ context->fds[n] = context->fds[n + 1];
+ n++;
+ }
+ context->fds_count--;
+ /* we only have to deal with one */
+ n = context->fds_count;
+ }
+
+ /* remove also from external POLL support via protocol 0 */
+ if (wsi->sock)
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_DEL_POLL_FD, (void *)(long)wsi->sock, NULL, 0);
wsi->state = WSI_STATE_DEAD_SOCKET;
- if (wsi->protocol->callback && n == WSI_STATE_ESTABLISHED)
- wsi->protocol->callback(wsi, LWS_CALLBACK_CLOSED,
+ /* tell the user it's all over for this guy */
+
+ if (wsi->protocol && wsi->protocol->callback &&
+ ((old_state == WSI_STATE_ESTABLISHED) ||
+ (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) ||
+ (old_state == WSI_STATE_AWAITING_CLOSE_ACK))) {
+ debug("calling back CLOSED\n");
+ wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
wsi->user_space, NULL, 0);
+ } else
+ debug("not calling back closed due to old_state=%d\n",
+ old_state);
+
+
+ /* deallocate any active extension contexts */
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ if (!wsi->active_extensions[n]->callback)
+ continue;
+
+ wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_DESTROY,
+ wsi->active_extensions_user[n], NULL, 0);
+
+ free(wsi->active_extensions_user[n]);
+ }
+
+ /*
+ * inform all extensions in case they tracked this guy out of band
+ * even though not active on him specifically
+ */
+
+ ext = context->extensions;
+ while (ext && ext->callback) {
+ ext->callback(context, ext, wsi,
+ LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING,
+ NULL, NULL, 0);
+ ext++;
+ }
+
+ /* free up his parsing allocations */
for (n = 0; n < WSI_TOKEN_COUNT; n++)
if (wsi->utf8_token[n].token)
free(wsi->utf8_token[n].token);
+ if (wsi->c_address)
+ free(wsi->c_address);
+
/* fprintf(stderr, "closing fd=%d\n", wsi->sock); */
#ifdef LWS_OPENSSL_SUPPORT
- if (use_ssl) {
+ if (wsi->ssl) {
n = SSL_get_fd(wsi->ssl);
SSL_shutdown(wsi->ssl);
+#ifdef WIN32
+ closesocket(n);
+#else
close(n);
+#endif
SSL_free(wsi->ssl);
} else {
#endif
shutdown(wsi->sock, SHUT_RDWR);
- close(wsi->sock);
+#ifdef WIN32
+ if (wsi->sock)
+ closesocket(wsi->sock);
+#else
+ if (wsi->sock)
+ close(wsi->sock);
+#endif
#ifdef LWS_OPENSSL_SUPPORT
}
#endif
free(wsi);
}
-static int
-libwebsocket_poll_connections(struct libwebsocket_context *this)
+/**
+ * libwebsockets_hangup_on_client() - Server calls to terminate client
+ * connection
+ * @context: libwebsockets context
+ * @fd: Connection socket descriptor
+ */
+
+void
+libwebsockets_hangup_on_client(struct libwebsocket_context *context, int fd)
{
- unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_BROADCAST_PAYLOAD +
- LWS_SEND_BUFFER_POST_PADDING];
- int client;
+ struct libwebsocket *wsi = wsi_from_fd(context, fd);
+
+ if (wsi == NULL)
+ return;
+
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+}
+
+
+/**
+ * libwebsockets_get_peer_addresses() - Get client address information
+ * @fd: Connection socket descriptor
+ * @name: Buffer to take client address name
+ * @name_len: Length of client address name buffer
+ * @rip: Buffer to take client address IP qotted quad
+ * @rip_len: Length of client address IP buffer
+ *
+ * This function fills in @name and @rip with the name and IP of
+ * the client connected with socket descriptor @fd. Names may be
+ * truncated if there is not enough room. If either cannot be
+ * determined, they will be returned as valid zero-length strings.
+ */
+
+void
+libwebsockets_get_peer_addresses(int fd, char *name, int name_len,
+ char *rip, int rip_len)
+{
+ unsigned int len;
+ struct sockaddr_in sin;
+ struct hostent *host;
+ struct hostent *host1;
+ char ip[128];
+ unsigned char *p;
int n;
- size_t len;
+ struct sockaddr_un *un;
- /* check for activity on client sockets */
-
- for (client = this->count_protocols + 1; client < this->fds_count;
- client++) {
-
- /* handle session socket closed */
+ rip[0] = '\0';
+ name[0] = '\0';
+
+ len = sizeof sin;
+ if (getpeername(fd, (struct sockaddr *) &sin, &len) < 0) {
+ perror("getpeername");
+ return;
+ }
- if (this->fds[client].revents & (POLLERR | POLLHUP)) {
-
- debug("Session Socket %d %p (fd=%d) dead\n",
- client, this->wsi[client], this->fds[client]);
+ host = gethostbyaddr((char *) &sin.sin_addr, sizeof sin.sin_addr,
+ AF_INET);
+ if (host == NULL) {
+ perror("gethostbyaddr");
+ return;
+ }
- libwebsocket_close_and_free_session(this->wsi[client]);
- goto nuke_this;
+ strncpy(name, host->h_name, name_len);
+ name[name_len - 1] = '\0';
+
+ host1 = gethostbyname(host->h_name);
+ if (host1 == NULL)
+ return;
+ p = (unsigned char *)host1;
+ n = 0;
+ while (p != NULL) {
+ p = (unsigned char *)host1->h_addr_list[n++];
+ if (p == NULL)
+ continue;
+ if ((host1->h_addrtype != AF_INET)
+#ifdef AF_LOCAL
+ && (host1->h_addrtype != AF_LOCAL)
+#endif
+ )
+ continue;
+
+ if (host1->h_addrtype == AF_INET)
+ sprintf(ip, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
+#ifdef AF_LOCAL
+ else {
+ un = (struct sockaddr_un *)p;
+ strncpy(ip, un->sun_path, sizeof(ip) -1);
+ ip[sizeof(ip) - 1] = '\0';
+ }
+#endif
+ p = NULL;
+ strncpy(rip, ip, rip_len);
+ rip[rip_len - 1] = '\0';
+ }
+}
+
+int libwebsockets_get_random(struct libwebsocket_context *context,
+ void *buf, int len)
+{
+ int n;
+ char *p = buf;
+
+#ifdef WIN32
+ for (n = 0; n < len; n++)
+ p[n] = (unsigned char)rand();
+#else
+ n = read(context->fd_random, p, len);
+#endif
+
+ return n;
+}
+
+unsigned char *
+libwebsockets_SHA1(const unsigned char *d, size_t n, unsigned char *md)
+{
+ return SHA1(d, n, md);
+}
+
+void libwebsockets_00_spaceout(char *key, int spaces, int seed)
+{
+ char *p;
+
+ key++;
+ while (spaces--) {
+ if (*key && (seed & 1))
+ key++;
+ seed >>= 1;
+
+ p = key + strlen(key);
+ while (p >= key) {
+ p[1] = p[0];
+ p--;
}
+ *key++ = ' ';
+ }
+}
+
+void libwebsockets_00_spam(char *key, int count, int seed)
+{
+ char *p;
+
+ key++;
+ while (count--) {
- /* any incoming data ready? */
+ if (*key && (seed & 1))
+ key++;
+ seed >>= 1;
+
+ p = key + strlen(key);
+ while (p >= key) {
+ p[1] = p[0];
+ p--;
+ }
+ *key++ = 0x21 + ((seed & 0xffff) % 15);
+ /* 4 would use it up too fast.. not like it matters */
+ seed >>= 1;
+ }
+}
+
+int lws_send_pipe_choked(struct libwebsocket *wsi)
+{
+ struct pollfd fds;
+
+ fds.fd = wsi->sock;
+ fds.events = POLLOUT;
+ fds.revents = 0;
+
+ if (poll(&fds, 1, 0) != 1)
+ return 1;
+
+ if ((fds.revents & POLLOUT) == 0)
+ return 1;
+
+ /* okay to send another packet without blocking */
+
+ return 0;
+}
+
+int
+lws_handle_POLLOUT_event(struct libwebsocket_context *context,
+ struct libwebsocket *wsi, struct pollfd *pollfd)
+{
+ struct lws_tokens eff_buf;
+ int n;
+ int ret;
+ int m;
+ int handled = 0;
- if (!(this->fds[client].revents & POLLIN))
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ if (!wsi->active_extensions[n]->callback)
continue;
- /* broadcast? */
+ m = wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_IS_WRITEABLE,
+ wsi->active_extensions_user[n], NULL, 0);
+ if (m > handled)
+ handled = m;
+ }
- if ((unsigned long)this->wsi[client] < LWS_MAX_PROTOCOLS) {
+ if (handled == 1)
+ goto notify_action;
- len = read(this->fds[client].fd,
- buf + LWS_SEND_BUFFER_PRE_PADDING,
- MAX_BROADCAST_PAYLOAD);
- if (len < 0) {
- fprintf(stderr, "Error receiving broadcast payload\n");
- continue;
- }
+ if (!wsi->extension_data_pending || handled == 2)
+ goto user_service;
+
+ /*
+ * check in on the active extensions, see if they
+ * had pending stuff to spill... they need to get the
+ * first look-in otherwise sequence will be disordered
+ *
+ * NULL, zero-length eff_buf means just spill pending
+ */
- /* broadcast it to all guys with this protocol index */
+ ret = 1;
+ while (ret == 1) {
- for (n = this->count_protocols + 1;
- n < this->fds_count; n++) {
+ /* default to nobody has more to spill */
- if ((unsigned long)this->wsi[n] <
- LWS_MAX_PROTOCOLS)
- continue;
+ ret = 0;
+ eff_buf.token = NULL;
+ eff_buf.token_len = 0;
+ /* give every extension a chance to spill */
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ m = wsi->active_extensions[n]->callback(
+ wsi->protocol->owning_server,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_PACKET_TX_PRESEND,
+ wsi->active_extensions_user[n], &eff_buf, 0);
+ if (m < 0) {
+ fprintf(stderr, "extension reports fatal error\n");
+ return -1;
+ }
+ if (m)
/*
- * never broadcast to non-established
- * connection
+ * at least one extension told us he has more
+ * to spill, so we will go around again after
*/
+ ret = 1;
+ }
- if (this->wsi[n]->state != WSI_STATE_ESTABLISHED)
- continue;
+ /* assuming they gave us something to send, send it */
+
+ if (eff_buf.token_len) {
+ if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
+ eff_buf.token_len))
+ return -1;
+ } else
+ continue;
+
+ /* no extension has more to spill */
+
+ if (!ret)
+ continue;
+
+ /*
+ * There's more to spill from an extension, but we just sent
+ * something... did that leave the pipe choked?
+ */
+
+ if (!lws_send_pipe_choked(wsi))
+ /* no we could add more */
+ continue;
+
+ debug("choked in POLLOUT service\n");
+
+ /*
+ * Yes, he's choked. Leave the POLLOUT masked on so we will
+ * come back here when he is unchoked. Don't call the user
+ * callback to enforce ordering of spilling, he'll get called
+ * when we come back here and there's nothing more to spill.
+ */
+
+ return 0;
+ }
+
+ wsi->extension_data_pending = 0;
+
+user_service:
+ /* one shot */
+
+ if (pollfd) {
+ pollfd->events &= ~POLLOUT;
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_CLEAR_MODE_POLL_FD,
+ (void *)(long)wsi->sock, NULL, POLLOUT);
+ }
+
+notify_action:
+
+ if (wsi->mode == LWS_CONNMODE_WS_CLIENT)
+ n = LWS_CALLBACK_CLIENT_WRITEABLE;
+ else
+ n = LWS_CALLBACK_SERVER_WRITEABLE;
+
+ wsi->protocol->callback(context, wsi, n, wsi->user_space, NULL, 0);
+
+ return 0;
+}
+
+
+
+void
+libwebsocket_service_timeout_check(struct libwebsocket_context *context,
+ struct libwebsocket *wsi, unsigned int sec)
+{
+ int n;
+
+ /*
+ * if extensions want in on it (eg, we are a mux parent)
+ * give them a chance to service child timeouts
+ */
+
+ for (n = 0; n < wsi->count_active_extensions; n++)
+ wsi->active_extensions[n]->callback(
+ context, wsi->active_extensions[n],
+ wsi, LWS_EXT_CALLBACK_1HZ,
+ wsi->active_extensions_user[n], NULL, sec);
+
+ if (!wsi->pending_timeout)
+ return;
+
+ /*
+ * if we went beyond the allowed time, kill the
+ * connection
+ */
+
+ if (sec > wsi->pending_timeout_limit) {
+ debug("TIMEDOUT WAITING\n");
+ libwebsocket_close_and_free_session(context,
+ wsi, LWS_CLOSE_STATUS_NOSTATUS);
+ }
+}
+
+struct libwebsocket *
+libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
+{
+ struct libwebsocket *new_wsi;
+ int n;
+
+ new_wsi = malloc(sizeof(struct libwebsocket));
+ if (new_wsi == NULL) {
+ fprintf(stderr, "Out of memory for new connection\n");
+ return NULL;
+ }
+
+ memset(new_wsi, 0, sizeof (struct libwebsocket));
+ new_wsi->count_active_extensions = 0;
+ new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
+
+ /* intialize the instance struct */
+
+ new_wsi->state = WSI_STATE_HTTP;
+ new_wsi->name_buffer_pos = 0;
+ new_wsi->mode = LWS_CONNMODE_WS_SERVING;
+
+ for (n = 0; n < WSI_TOKEN_COUNT; n++) {
+ new_wsi->utf8_token[n].token = NULL;
+ new_wsi->utf8_token[n].token_len = 0;
+ }
+
+ /*
+ * these can only be set once the protocol is known
+ * we set an unestablished connection's protocol pointer
+ * to the start of the supported list, so it can look
+ * for matching ones during the handshake
+ */
+ new_wsi->protocol = context->protocols;
+ new_wsi->user_space = NULL;
+
+ /*
+ * Default protocol is 76 / 00
+ * After 76, there's a header specified to inform which
+ * draft the client wants, when that's seen we modify
+ * the individual connection's spec revision accordingly
+ */
+ new_wsi->ietf_spec_revision = 0;
+
+ return new_wsi;
+}
+
+char *
+libwebsockets_generate_client_handshake(struct libwebsocket_context *context,
+ struct libwebsocket *wsi, char *pkt)
+{
+ char hash[20];
+ char *p = pkt;
+ int n;
+ struct libwebsocket_extension *ext;
+ struct libwebsocket_extension *ext1;
+ int ext_count = 0;
+ unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
+ LWS_SEND_BUFFER_POST_PADDING];
+ static const char magic_websocket_guid[] =
+ "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+
+ /*
+ * create the random key
+ */
+
+ n = libwebsockets_get_random(context, hash, 16);
+ if (n != 16) {
+ fprintf(stderr, "Unable to read from random dev %s\n",
+ SYSTEM_RANDOM_FILEPATH);
+ free(wsi->c_path);
+ free(wsi->c_host);
+ if (wsi->c_origin)
+ free(wsi->c_origin);
+ if (wsi->c_protocol)
+ free(wsi->c_protocol);
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return NULL;
+ }
+
+ lws_b64_encode_string(hash, 16, wsi->key_b64,
+ sizeof wsi->key_b64);
+
+ /*
+ * 00 example client handshake
+ *
+ * GET /socket.io/websocket HTTP/1.1
+ * Upgrade: WebSocket
+ * Connection: Upgrade
+ * Host: 127.0.0.1:9999
+ * Origin: http://127.0.0.1
+ * Sec-WebSocket-Key1: 1 0 2#0W 9 89 7 92 ^
+ * Sec-WebSocket-Key2: 7 7Y 4328 B2v[8(z1
+ * Cookie: socketio=websocket
+ *
+ * (Á®Ä0¶†≥
+ *
+ * 04 example client handshake
+ *
+ * GET /chat HTTP/1.1
+ * Host: server.example.com
+ * Upgrade: websocket
+ * Connection: Upgrade
+ * Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
+ * Sec-WebSocket-Origin: http://example.com
+ * Sec-WebSocket-Protocol: chat, superchat
+ * Sec-WebSocket-Version: 4
+ */
+
+ p += sprintf(p, "GET %s HTTP/1.1\x0d\x0a", wsi->c_path);
+
+ if (wsi->ietf_spec_revision == 0) {
+ unsigned char spaces_1, spaces_2;
+ unsigned int max_1, max_2;
+ unsigned int num_1, num_2;
+ unsigned long product_1, product_2;
+ char key_1[40];
+ char key_2[40];
+ unsigned int seed;
+ unsigned int count;
+ char challenge[16];
+
+ libwebsockets_get_random(context, &spaces_1,
+ sizeof(char));
+ libwebsockets_get_random(context, &spaces_2,
+ sizeof(char));
+
+ spaces_1 = (spaces_1 % 12) + 1;
+ spaces_2 = (spaces_2 % 12) + 1;
+
+ max_1 = 4294967295 / spaces_1;
+ max_2 = 4294967295 / spaces_2;
+
+ libwebsockets_get_random(context, &num_1, sizeof(int));
+ libwebsockets_get_random(context, &num_2, sizeof(int));
+
+ num_1 = (num_1 % max_1);
+ num_2 = (num_2 % max_2);
+
+ challenge[0] = num_1 >> 24;
+ challenge[1] = num_1 >> 16;
+ challenge[2] = num_1 >> 8;
+ challenge[3] = num_1;
+ challenge[4] = num_2 >> 24;
+ challenge[5] = num_2 >> 16;
+ challenge[6] = num_2 >> 8;
+ challenge[7] = num_2;
+
+ product_1 = num_1 * spaces_1;
+ product_2 = num_2 * spaces_2;
+
+ sprintf(key_1, "%lu", product_1);
+ sprintf(key_2, "%lu", product_2);
+
+ libwebsockets_get_random(context, &seed, sizeof(int));
+ libwebsockets_get_random(context, &count, sizeof(int));
+
+ libwebsockets_00_spam(key_1, (count % 12) + 1, seed);
+
+ libwebsockets_get_random(context, &seed, sizeof(int));
+ libwebsockets_get_random(context, &count, sizeof(int));
+
+ libwebsockets_00_spam(key_2, (count % 12) + 1, seed);
+
+ libwebsockets_get_random(context, &seed, sizeof(int));
+
+ libwebsockets_00_spaceout(key_1, spaces_1, seed);
+ libwebsockets_00_spaceout(key_2, spaces_2, seed >> 16);
+
+ p += sprintf(p, "Upgrade: WebSocket\x0d\x0a"
+ "Connection: Upgrade\x0d\x0aHost: %s\x0d\x0a",
+ wsi->c_host);
+ if (wsi->c_origin)
+ p += sprintf(p, "Origin: %s\x0d\x0a",
+ wsi->c_origin);
+
+ if (wsi->c_protocol)
+ p += sprintf(p, "Sec-WebSocket-Protocol: %s"
+ "\x0d\x0a", wsi->c_protocol);
+
+ p += sprintf(p, "Sec-WebSocket-Key1: %s\x0d\x0a",
+ key_1);
+ p += sprintf(p, "Sec-WebSocket-Key2: %s\x0d\x0a",
+ key_2);
+
+ /* give userland a chance to append, eg, cookies */
+
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
+ NULL, &p, (pkt + sizeof(pkt)) - p - 12);
+
+ p += sprintf(p, "\x0d\x0a");
+
+ if (libwebsockets_get_random(context, p, 8) != 8)
+ return NULL;
+ memcpy(&challenge[8], p, 8);
+ p += 8;
+
+ /* precompute what we want to see from the server */
+
+ MD5((unsigned char *)challenge, 16,
+ (unsigned char *)wsi->initial_handshake_hash_base64);
+
+ goto issue_hdr;
+ }
+
+ p += sprintf(p, "Host: %s\x0d\x0a", wsi->c_host);
+ p += sprintf(p, "Upgrade: websocket\x0d\x0a");
+ p += sprintf(p, "Connection: Upgrade\x0d\x0a"
+ "Sec-WebSocket-Key: ");
+ strcpy(p, wsi->key_b64);
+ p += strlen(wsi->key_b64);
+ p += sprintf(p, "\x0d\x0a");
+ if (wsi->c_origin)
+ p += sprintf(p, "Sec-WebSocket-Origin: %s\x0d\x0a",
+ wsi->c_origin);
+ if (wsi->c_protocol)
+ p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a",
+ wsi->c_protocol);
+
+ /* tell the server what extensions we could support */
+
+ p += sprintf(p, "Sec-WebSocket-Extensions: ");
+
+ ext =context->extensions;
+ while (ext && ext->callback) {
+
+ n = 0;
+ ext1 = context->extensions;
+ while (ext1 && ext1->callback) {
+
+ n |= ext1->callback(context, ext1, wsi,
+ LWS_EXT_CALLBACK_CHECK_OK_TO_PROPOSE_EXTENSION,
+ NULL, (char *)ext->name, 0);
+
+ ext1++;
+ }
+
+ if (n) {
+
+ /* an extension vetos us */
+ debug("ext %s vetoed\n", (char *)ext->name);
+ ext++;
+ continue;
+ }
+
+ n = context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
+ wsi->user_space, (char *)ext->name, 0);
+
+ /*
+ * zero return from callback means
+ * go ahead and allow the extension,
+ * it's what we get if the callback is
+ * unhandled
+ */
+
+ if (n) {
+ ext++;
+ continue;
+ }
+
+ /* apply it */
+
+ if (ext_count)
+ *p++ = ',';
+ p += sprintf(p, "%s", ext->name);
+ ext_count++;
+
+ ext++;
+ }
+
+ p += sprintf(p, "\x0d\x0a");
+
+ if (wsi->ietf_spec_revision)
+ p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
+ wsi->ietf_spec_revision);
+
+ /* give userland a chance to append, eg, cookies */
+
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
+ NULL, &p, (pkt + sizeof(pkt)) - p - 12);
+
+ p += sprintf(p, "\x0d\x0a");
+
+ /* prepare the expected server accept response */
+
+ strcpy((char *)buf, wsi->key_b64);
+ strcpy((char *)&buf[strlen((char *)buf)], magic_websocket_guid);
+
+ SHA1(buf, strlen((char *)buf), (unsigned char *)hash);
+
+ lws_b64_encode_string(hash, 20,
+ wsi->initial_handshake_hash_base64,
+ sizeof wsi->initial_handshake_hash_base64);
+
+issue_hdr:
+
+// puts(pkt);
+
+ /* done with these now */
+
+ free(wsi->c_path);
+ free(wsi->c_host);
+ if (wsi->c_origin)
+ free(wsi->c_origin);
+
+ return p;
+}
+
+int
+lws_client_interpret_server_handshake(struct libwebsocket_context *context,
+ struct libwebsocket *wsi)
+{
+ unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
+ LWS_SEND_BUFFER_POST_PADDING];
+ char pkt[1024];
+ char *p = &pkt[0];
+ const char *pc;
+ const char *c;
+ int more = 1;
+ int okay = 0;
+ char ext_name[128];
+ struct libwebsocket_extension *ext;
+ void *v;
+ int len = 0;
+ int n;
+ static const char magic_websocket_04_masking_guid[] =
+ "61AC5F19-FBBA-4540-B96F-6561F1AB40A8";
+
+ /*
+ * 00 / 76 -->
+ *
+ * HTTP/1.1 101 WebSocket Protocol Handshake
+ * Upgrade: WebSocket
+ * Connection: Upgrade
+ * Sec-WebSocket-Origin: http://127.0.0.1
+ * Sec-WebSocket-Location: ws://127.0.0.1:9999/socket.io/websocket
+ *
+ * xxxxxxxxxxxxxxxx
+ */
+
+ if (wsi->ietf_spec_revision == 0) {
+ if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
+ (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
+ wsi->c_protocol != NULL)) {
+ debug("libwebsocket_client_handshake "
+ "missing required header(s)\n");
+ pkt[len] = '\0';
+ debug("%s", pkt);
+ goto bail3;
+ }
+
+ strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
+ if (strncmp(wsi->utf8_token[WSI_TOKEN_HTTP].token,
+ "101", 3)) {
+ fprintf(stderr, "libwebsocket_client_handshake "
+ "server sent bad HTTP response '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_HTTP].token);
+ goto bail3;
+ }
+
+ if (wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len <
+ 16) {
+ fprintf(stderr, "libwebsocket_client_handshake "
+ "challenge reply too short %d\n",
+ wsi->utf8_token[
+ WSI_TOKEN_CHALLENGE].token_len);
+ pkt[len] = '\0';
+ debug("%s", pkt);
+ goto bail3;
+
+ }
+
+ goto select_protocol;
+ }
+
+ /*
+ * well, what the server sent looked reasonable for syntax.
+ * Now let's confirm it sent all the necessary headers
+ */
+#if 0
+ fprintf(stderr, "WSI_TOKEN_HTTP: %d\n", wsi->utf8_token[WSI_TOKEN_HTTP].token_len);
+ fprintf(stderr, "WSI_TOKEN_UPGRADE: %d\n", wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len);
+ fprintf(stderr, "WSI_TOKEN_CONNECTION: %d\n", wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len);
+ fprintf(stderr, "WSI_TOKEN_ACCEPT: %d\n", wsi->utf8_token[WSI_TOKEN_ACCEPT].token_len);
+ fprintf(stderr, "WSI_TOKEN_NONCE: %d\n", wsi->utf8_token[WSI_TOKEN_NONCE].token_len);
+ fprintf(stderr, "WSI_TOKEN_PROTOCOL: %d\n", wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
+#endif
+ if (!wsi->utf8_token[WSI_TOKEN_HTTP].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len ||
+ !wsi->utf8_token[WSI_TOKEN_ACCEPT].token_len ||
+ (!wsi->utf8_token[WSI_TOKEN_NONCE].token_len &&
+ wsi->ietf_spec_revision == 4) ||
+ (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len &&
+ wsi->c_protocol != NULL)) {
+ debug("libwebsocket_client_handshake "
+ "missing required header(s)\n");
+ pkt[len] = '\0';
+ debug("%s", pkt);
+ goto bail3;
+ }
+
+ /*
+ * Everything seems to be there, now take a closer look at what
+ * is in each header
+ */
+
+ strtolower(wsi->utf8_token[WSI_TOKEN_HTTP].token);
+ if (strncmp(wsi->utf8_token[WSI_TOKEN_HTTP].token, "101", 3)) {
+ fprintf(stderr, "libwebsocket_client_handshake "
+ "server sent bad HTTP response '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_HTTP].token);
+ goto bail3;
+ }
+
+ strtolower(wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
+ if (strcmp(wsi->utf8_token[WSI_TOKEN_UPGRADE].token,
+ "websocket")) {
+ fprintf(stderr, "libwebsocket_client_handshake server "
+ "sent bad Upgrade header '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_UPGRADE].token);
+ goto bail3;
+ }
+
+ strtolower(wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
+ if (strcmp(wsi->utf8_token[WSI_TOKEN_CONNECTION].token,
+ "upgrade")) {
+ fprintf(stderr, "libwebsocket_client_handshake server "
+ "sent bad Connection hdr '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_CONNECTION].token);
+ goto bail3;
+ }
+
+select_protocol:
+ pc = wsi->c_protocol;
+ if (pc == NULL)
+ fprintf(stderr, "lws_client_interpret_server_handshake: NULL c_protocol\n");
+ else
+ debug("lws_client_interpret_server_handshake: cPprotocol='%s'\n", pc);
+
+ /*
+ * confirm the protocol the server wants to talk was in the list
+ * of protocols we offered
+ */
+
+ if (!wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len) {
+
+ fprintf(stderr, "lws_client_interpret_server_handshake WSI_TOKEN_PROTOCOL is null\n");
+ /*
+ * no protocol name to work from,
+ * default to first protocol
+ */
+ wsi->protocol = &context->protocols[0];
+
+ free(wsi->c_protocol);
+
+ goto check_accept;
+ }
+
+ while (*pc && !okay) {
+ if ((!strncmp(pc,
+ wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
+ wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len)) &&
+ (pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == ',' ||
+ pc[wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len] == '\0')) {
+ okay = 1;
+ continue;
+ }
+ while (*pc && *pc != ',')
+ pc++;
+ while (*pc && *pc != ' ')
+ pc++;
+ }
+
+ /* done with him now */
+
+ if (wsi->c_protocol)
+ free(wsi->c_protocol);
+
+
+ if (!okay) {
+ fprintf(stderr, "libwebsocket_client_handshake server "
+ "sent bad protocol '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
+ goto bail2;
+ }
+
+ /*
+ * identify the selected protocol struct and set it
+ */
+ n = 0;
+ wsi->protocol = NULL;
+ while (context->protocols[n].callback) {
+ if (strcmp(wsi->utf8_token[WSI_TOKEN_PROTOCOL].token,
+ context->protocols[n].name) == 0)
+ wsi->protocol = &context->protocols[n];
+ n++;
+ }
+
+ if (wsi->protocol == NULL) {
+ fprintf(stderr, "libwebsocket_client_handshake server "
+ "requested protocol '%s', which we "
+ "said we supported but we don't!\n",
+ wsi->utf8_token[WSI_TOKEN_PROTOCOL].token);
+ goto bail2;
+ }
+
+
+ /* instantiate the accepted extensions */
+
+ if (!wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token_len) {
+ debug("no client extenstions allowed by server \n");
+ goto check_accept;
+ }
+
+ /*
+ * break down the list of server accepted extensions
+ * and go through matching them or identifying bogons
+ */
+
+ c = wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token;
+ n = 0;
+ while (more) {
+
+ if (*c && (*c != ',' && *c != ' ' && *c != '\t')) {
+ ext_name[n] = *c++;
+ if (n < sizeof(ext_name) - 1)
+ n++;
+ continue;
+ }
+ ext_name[n] = '\0';
+ if (!*c)
+ more = 0;
+ else {
+ c++;
+ if (!n)
+ continue;
+ }
+
+ /* check we actually support it */
+
+ debug("checking client ext %s\n", ext_name);
+
+ n = 0;
+ ext = wsi->protocol->owning_server->extensions;
+ while (ext && ext->callback) {
+
+ if (strcmp(ext_name, ext->name)) {
+ ext++;
+ continue;
+ }
+
+ n = 1;
+
+ debug("instantiating client ext %s\n", ext_name);
+
+ /* instantiate the extension on this conn */
+
+ wsi->active_extensions_user[
+ wsi->count_active_extensions] =
+ malloc(ext->per_session_data_size);
+ memset(wsi->active_extensions_user[
+ wsi->count_active_extensions], 0,
+ ext->per_session_data_size);
+ wsi->active_extensions[
+ wsi->count_active_extensions] = ext;
+
+ /* allow him to construct his context */
+
+ ext->callback(wsi->protocol->owning_server,
+ ext, wsi,
+ LWS_EXT_CALLBACK_CLIENT_CONSTRUCT,
+ wsi->active_extensions_user[
+ wsi->count_active_extensions],
+ NULL, 0);
+
+ wsi->count_active_extensions++;
+
+ ext++;
+ }
+
+ if (n == 0) {
+ fprintf(stderr, "Server said we should use"
+ "an unknown extension '%s'!\n", ext_name);
+ goto bail2;
+ }
+
+ n = 0;
+ }
+
+
+check_accept:
+
+ if (wsi->ietf_spec_revision == 0) {
+
+ if (memcmp(wsi->initial_handshake_hash_base64,
+ wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 16)) {
+ fprintf(stderr, "libwebsocket_client_handshake "
+ "failed 00 challenge compare\n");
+ pkt[len] = '\0';
+ fprintf(stderr, "%s", pkt);
+ goto bail2;
+ }
+
+ goto accept_ok;
+ }
+
+ /*
+ * Confirm his accept token is the one we precomputed
+ */
+
+ if (strcmp(wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
+ wsi->initial_handshake_hash_base64)) {
+ fprintf(stderr, "libwebsocket_client_handshake server "
+ "sent bad ACCEPT '%s' vs computed '%s'\n",
+ wsi->utf8_token[WSI_TOKEN_ACCEPT].token,
+ wsi->initial_handshake_hash_base64);
+ goto bail2;
+ }
+
+ if (wsi->ietf_spec_revision == 4) {
+ /*
+ * Calculate the 04 masking key to use when
+ * sending data to server
+ */
+
+ strcpy((char *)buf, wsi->key_b64);
+ p = (char *)buf + strlen(wsi->key_b64);
+ strcpy(p, wsi->utf8_token[WSI_TOKEN_NONCE].token);
+ p += wsi->utf8_token[WSI_TOKEN_NONCE].token_len;
+ strcpy(p, magic_websocket_04_masking_guid);
+ SHA1(buf, strlen((char *)buf), wsi->masking_key_04);
+ }
+ accept_ok:
+
+ /* allocate the per-connection user memory (if any) */
+ if (wsi->protocol->per_session_data_size && !libwebsocket_ensure_user_space(wsi))
+ goto bail2;
+
+ /* clear his proxy connection timeout */
+
+ libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
+
+ /* mark him as being alive */
+
+ wsi->state = WSI_STATE_ESTABLISHED;
+ wsi->mode = LWS_CONNMODE_WS_CLIENT;
+
+ fprintf(stderr, "handshake OK for protocol %s\n",
+ wsi->protocol->name);
+
+ /* call him back to inform him he is up */
+
+ wsi->protocol->callback(context, wsi,
+ LWS_CALLBACK_CLIENT_ESTABLISHED,
+ wsi->user_space,
+ NULL, 0);
+
+ /*
+ * inform all extensions, not just active ones since they
+ * already know
+ */
+
+ ext = context->extensions;
+
+ while (ext && ext->callback) {
+ v = NULL;
+ for (n = 0; n < wsi->count_active_extensions; n++)
+ if (wsi->active_extensions[n] == ext)
+ v = wsi->active_extensions_user[n];
+
+ ext->callback(context, ext, wsi,
+ LWS_EXT_CALLBACK_ANY_WSI_ESTABLISHED, v, NULL, 0);
+ ext++;
+ }
+
+ return 0;
+
+bail3:
+ if (wsi->c_protocol)
+ free(wsi->c_protocol);
+
+bail2:
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+}
+
+
+
+/**
+ * libwebsocket_service_fd() - Service polled socket with something waiting
+ * @context: Websocket context
+ * @pollfd: The pollfd entry describing the socket fd and which events
+ * happened.
+ *
+ * This function closes any active connections and then frees the
+ * context. After calling this, any further use of the context is
+ * undefined.
+ */
+
+int
+libwebsocket_service_fd(struct libwebsocket_context *context,
+ struct pollfd *pollfd)
+{
+ unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 + MAX_BROADCAST_PAYLOAD +
+ LWS_SEND_BUFFER_POST_PADDING];
+ struct libwebsocket *wsi;
+ struct libwebsocket *new_wsi;
+ int n;
+ int m;
+ ssize_t len;
+ int accept_fd;
+ unsigned int clilen;
+ struct sockaddr_in cli_addr;
+ struct timeval tv;
+ char pkt[1024];
+ char *p = &pkt[0];
+ int more = 1;
+ struct lws_tokens eff_buf;
+ int opt = 1;
+ char c;
+
+#ifdef LWS_OPENSSL_SUPPORT
+ char ssl_err_buf[512];
+#endif
+ /*
+ * you can call us with pollfd = NULL to just allow the once-per-second
+ * global timeout checks; if less than a second since the last check
+ * it returns immediately then.
+ */
+
+ gettimeofday(&tv, NULL);
+
+ if (context->last_timeout_check_s != tv.tv_sec) {
+ context->last_timeout_check_s = tv.tv_sec;
+
+ /* global timeout check once per second */
+
+ for (n = 0; n < context->fds_count; n++) {
+ wsi = wsi_from_fd(context, context->fds[n].fd);
+
+ libwebsocket_service_timeout_check(context, wsi,
+ tv.tv_sec);
+ }
+ }
+
+ /* just here for timeout management? */
+
+ if (pollfd == NULL)
+ return 0;
+
+ /* no, here to service a socket descriptor */
+
+ wsi = wsi_from_fd(context, pollfd->fd);
+
+ if (wsi == NULL)
+ return 1;
+
+ switch (wsi->mode) {
+ case LWS_CONNMODE_SERVER_LISTENER:
+
+ /* pollin means a client has connected to us then */
+
+ if (!pollfd->revents & POLLIN)
+ break;
+
+ if (context->fds_count >= MAX_CLIENTS) {
+ fprintf(stderr, "too busy to accept new client\n");
+ break;
+ }
+
+ /* listen socket got an unencrypted connection... */
+
+ clilen = sizeof(cli_addr);
+ accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
+ &clilen);
+ if (accept_fd < 0) {
+ fprintf(stderr, "ERROR on accept");
+ break;
+ }
+
+ /* Disable Nagle */
+ opt = 1;
+ setsockopt(accept_fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&opt,
+ sizeof(opt));
+
+ /*
+ * look at who we connected to and give user code a chance
+ * to reject based on client IP. There's no protocol selected
+ * yet so we issue this to protocols[0]
+ */
+
+ if ((context->protocols[0].callback)(context, wsi,
+ LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
+ (void*)(long)accept_fd, NULL, 0)) {
+ debug("Callback denied network connection\n");
+#ifdef WIN32
+ closesocket(accept_fd);
+#else
+ close(accept_fd);
+#endif
+ break;
+ }
+
+ /* accepting connection to main listener */
+
+ new_wsi = libwebsocket_create_new_server_wsi(context);
+ if (new_wsi == NULL)
+ break;
+
+ new_wsi->sock = accept_fd;
+
+
+#ifdef LWS_OPENSSL_SUPPORT
+ new_wsi->ssl = NULL;
+
+ if (context->use_ssl) {
+
+ new_wsi->ssl = SSL_new(context->ssl_ctx);
+ if (new_wsi->ssl == NULL) {
+ fprintf(stderr, "SSL_new failed: %s\n",
+ ERR_error_string(SSL_get_error(
+ new_wsi->ssl, 0), NULL));
+ libwebsockets_decode_ssl_error();
+ free(new_wsi);
+ break;
+ }
+
+ SSL_set_fd(new_wsi->ssl, accept_fd);
+
+ n = SSL_accept(new_wsi->ssl);
+ if (n != 1) {
+ /*
+ * browsers seem to probe with various
+ * ssl params which fail then retry
+ * and succeed
+ */
+ debug("SSL_accept failed skt %u: %s\n",
+ pollfd->fd,
+ ERR_error_string(SSL_get_error(
+ new_wsi->ssl, n), NULL));
+ SSL_free(
+ new_wsi->ssl);
+ free(new_wsi);
+ break;
+ }
+
+ debug("accepted new SSL conn "
+ "port %u on fd=%d SSL ver %s\n",
+ ntohs(cli_addr.sin_port), accept_fd,
+ SSL_get_version(new_wsi->ssl));
+
+ } else
+#endif
+ debug("accepted new conn port %u on fd=%d\n",
+ ntohs(cli_addr.sin_port), accept_fd);
+
+ insert_wsi(context, new_wsi);
+
+ /*
+ * make sure NO events are seen yet on this new socket
+ * (otherwise we inherit old fds[client].revents from
+ * previous socket there and die mysteriously! )
+ */
+ context->fds[context->fds_count].revents = 0;
+
+ context->fds[context->fds_count].events = POLLIN;
+ context->fds[context->fds_count++].fd = accept_fd;
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, new_wsi,
+ LWS_CALLBACK_ADD_POLL_FD,
+ (void *)(long)accept_fd, NULL, POLLIN);
+
+ break;
+
+ case LWS_CONNMODE_BROADCAST_PROXY_LISTENER:
+
+ /* as we are listening, POLLIN means accept() is needed */
+
+ if (!pollfd->revents & POLLIN)
+ break;
+
+ /* listen socket got an unencrypted connection... */
+
+ clilen = sizeof(cli_addr);
+ accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
+ &clilen);
+ if (accept_fd < 0) {
+ fprintf(stderr, "ERROR on accept");
+ break;
+ }
+
+ if (context->fds_count >= MAX_CLIENTS) {
+ fprintf(stderr, "too busy to accept new broadcast "
+ "proxy client\n");
+#ifdef WIN32
+ closesocket(accept_fd);
+#else
+ close(accept_fd);
+#endif
+ break;
+ }
+
+ /* create a dummy wsi for the connection and add it */
+
+ new_wsi = malloc(sizeof(struct libwebsocket));
+ memset(new_wsi, 0, sizeof (struct libwebsocket));
+ new_wsi->sock = accept_fd;
+ new_wsi->mode = LWS_CONNMODE_BROADCAST_PROXY;
+ new_wsi->state = WSI_STATE_ESTABLISHED;
+ new_wsi->count_active_extensions = 0;
+ /* note which protocol we are proxying */
+ new_wsi->protocol_index_for_broadcast_proxy =
+ wsi->protocol_index_for_broadcast_proxy;
+ insert_wsi(context, new_wsi);
+
+ /* add connected socket to internal poll array */
+
+ context->fds[context->fds_count].revents = 0;
+ context->fds[context->fds_count].events = POLLIN;
+ context->fds[context->fds_count++].fd = accept_fd;
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, new_wsi,
+ LWS_CALLBACK_ADD_POLL_FD,
+ (void *)(long)accept_fd, NULL, POLLIN);
+
+ break;
+
+ case LWS_CONNMODE_BROADCAST_PROXY:
+
+ /* handle session socket closed */
+
+ if (pollfd->revents & (POLLERR | POLLHUP)) {
+
+ debug("Session Socket %p (fd=%d) dead\n",
+ (void *)wsi, pollfd->fd);
+
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NORMAL);
+ return 1;
+ }
+
+ /*
+ * either extension code with stuff to spill, or the user code,
+ * requested a callback when it was OK to write
+ */
+
+ if (pollfd->revents & POLLOUT)
+ if (lws_handle_POLLOUT_event(context, wsi, pollfd) < 0) {
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NORMAL);
+ return 1;
+ }
+
+ /* any incoming data ready? */
+
+ if (!(pollfd->revents & POLLIN))
+ break;
+
+ /* get the issued broadcast payload from the socket */
+
+ len = read(pollfd->fd, buf + LWS_SEND_BUFFER_PRE_PADDING,
+ MAX_BROADCAST_PAYLOAD);
+ if (len < 0) {
+ fprintf(stderr, "Error reading broadcast payload\n");
+ break;
+ }
+
+ /* broadcast it to all guys with this protocol index */
+
+ for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
+
+ for (m = 0; m < context->fd_hashtable[n].length; m++) {
+
+ new_wsi = context->fd_hashtable[n].wsi[m];
+
+ /* only to clients we are serving to */
+
+ if (new_wsi->mode != LWS_CONNMODE_WS_SERVING)
+ continue;
+
+ /*
+ * never broadcast to non-established
+ * connection
+ */
+
+ if (new_wsi->state != WSI_STATE_ESTABLISHED)
+ continue;
+
+ /*
+ * only broadcast to connections using
+ * the requested protocol
+ */
+
+ if (new_wsi->protocol->protocol_index !=
+ wsi->protocol_index_for_broadcast_proxy)
+ continue;
+
+ /* broadcast it to this connection */
+
+ new_wsi->protocol->callback(context, new_wsi,
+ LWS_CALLBACK_BROADCAST,
+ new_wsi->user_space,
+ buf + LWS_SEND_BUFFER_PRE_PADDING, len);
+ }
+ }
+ break;
+
+ case LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY:
+
+ /* handle proxy hung up on us */
+
+ if (pollfd->revents & (POLLERR | POLLHUP)) {
+
+ fprintf(stderr, "Proxy connection %p (fd=%d) dead\n",
+ (void *)wsi, pollfd->fd);
+
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+
+ n = recv(wsi->sock, pkt, sizeof pkt, 0);
+ if (n < 0) {
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ fprintf(stderr, "ERROR reading from proxy socket\n");
+ return 1;
+ }
+
+ pkt[13] = '\0';
+ if (strcmp(pkt, "HTTP/1.0 200 ") != 0) {
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ fprintf(stderr, "ERROR from proxy: %s\n", pkt);
+ return 1;
+ }
+
+ /* clear his proxy connection timeout */
+
+ libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
+
+ /* fallthru */
+
+ case LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE:
+
+ #ifdef LWS_OPENSSL_SUPPORT
+ if (wsi->use_ssl) {
+
+ wsi->ssl = SSL_new(context->ssl_client_ctx);
+ wsi->client_bio = BIO_new_socket(wsi->sock,
+ BIO_NOCLOSE);
+ SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);
+
+ SSL_set_ex_data(wsi->ssl,
+ openssl_websocket_private_data_index,
+ context);
+
+ if (SSL_connect(wsi->ssl) <= 0) {
+ fprintf(stderr, "SSL connect error %s\n",
+ ERR_error_string(ERR_get_error(),
+ ssl_err_buf));
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+
+ n = SSL_get_verify_result(wsi->ssl);
+ if ((n != X509_V_OK) && (
+ n != X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
+ wsi->use_ssl != 2)) {
+
+ fprintf(stderr, "server's cert didn't "
+ "look good %d\n", n);
+ libwebsocket_close_and_free_session(context,
+ wsi, LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+ } else {
+ wsi->ssl = NULL;
+ #endif
+
+
+ #ifdef LWS_OPENSSL_SUPPORT
+ }
+ #endif
+
+ p = libwebsockets_generate_client_handshake(context, wsi, p);
+ if (p ==NULL)
+ return 1;
+
+ /* send our request to the server */
+
+ #ifdef LWS_OPENSSL_SUPPORT
+ if (wsi->use_ssl)
+ n = SSL_write(wsi->ssl, pkt, p - pkt);
+ else
+ #endif
+ n = send(wsi->sock, pkt, p - pkt, 0);
+
+ if (n < 0) {
+ fprintf(stderr, "ERROR writing to client socket\n");
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+
+ wsi->parser_state = WSI_TOKEN_NAME_PART;
+ wsi->mode = LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY;
+ libwebsocket_set_timeout(wsi,
+ PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, 5);
+
+ break;
+
+ case LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY:
+
+ /* handle server hung up on us */
+
+ if (pollfd->revents & (POLLERR | POLLHUP)) {
+
+ fprintf(stderr, "Server connection %p (fd=%d) dead\n",
+ (void *)wsi, pollfd->fd);
+
+ goto bail3;
+ }
+
+
+ /* interpret the server response */
+
+ /*
+ * HTTP/1.1 101 Switching Protocols
+ * Upgrade: websocket
+ * Connection: Upgrade
+ * Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo=
+ * Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC==
+ * Sec-WebSocket-Protocol: chat
+ */
+
+ /*
+ * we have to take some care here to only take from the
+ * socket bytewise. The browser may (and has been seen to
+ * in the case that onopen() performs websocket traffic)
+ * coalesce both handshake response and websocket traffic
+ * in one packet, since at that point the connection is
+ * definitively ready from browser pov.
+ */
+
+ len = 1;
+ while (wsi->parser_state != WSI_PARSING_COMPLETE && len > 0) {
+#ifdef LWS_OPENSSL_SUPPORT
+ if (wsi->use_ssl)
+ len = SSL_read(wsi->ssl, &c, 1);
+ else
+#endif
+ len = recv(wsi->sock, &c, 1, 0);
+
+ libwebsocket_parse(wsi, c);
+ }
+
+ /*
+ * hs may also be coming in multiple packets, there is a 5-second
+ * libwebsocket timeout still active here too, so if parsing did
+ * not complete just wait for next packet coming in this state
+ */
+
+ if (wsi->parser_state != WSI_PARSING_COMPLETE)
+ break;
+
+ /*
+ * otherwise deal with the handshake. If there's any
+ * packet traffic already arrived we'll trigger poll() again
+ * right away and deal with it that way
+ */
+
+ return lws_client_interpret_server_handshake(context, wsi);
+
+bail3:
+ if (wsi->c_protocol)
+ free(wsi->c_protocol);
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+
+ case LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT:
+ fprintf(stderr, "LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT\n");
+ break;
+
+ case LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD:
+ fprintf(stderr, "LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD\n");
+ break;
+
+
+ case LWS_CONNMODE_WS_SERVING:
+ case LWS_CONNMODE_WS_CLIENT:
+
+ /* handle session socket closed */
+
+ if (pollfd->revents & (POLLERR | POLLHUP)) {
+
+ fprintf(stderr, "Session Socket %p (fd=%d) dead\n",
+ (void *)wsi, pollfd->fd);
+
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+
+ /* the guy requested a callback when it was OK to write */
+
+ if ((pollfd->revents & POLLOUT) &&
+ wsi->state == WSI_STATE_ESTABLISHED)
+ if (lws_handle_POLLOUT_event(context, wsi,
+ pollfd) < 0) {
+ libwebsocket_close_and_free_session(
+ context, wsi, LWS_CLOSE_STATUS_NORMAL);
+ return 1;
+ }
+
+
+ /* any incoming data ready? */
+
+ if (!(pollfd->revents & POLLIN))
+ break;
+
+#ifdef LWS_OPENSSL_SUPPORT
+ if (wsi->ssl)
+ eff_buf.token_len = SSL_read(wsi->ssl, buf, sizeof buf);
+ else
+#endif
+ eff_buf.token_len =
+ recv(pollfd->fd, buf, sizeof buf, 0);
+
+ if (eff_buf.token_len < 0) {
+ fprintf(stderr, "Socket read returned %d\n",
+ eff_buf.token_len);
+ if (errno != EINTR)
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+ if (!eff_buf.token_len) {
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+
+ /*
+ * give any active extensions a chance to munge the buffer
+ * before parse. We pass in a pointer to an lws_tokens struct
+ * prepared with the default buffer and content length that's in
+ * there. Rather than rewrite the default buffer, extensions
+ * that expect to grow the buffer can adapt .token to
+ * point to their own per-connection buffer in the extension
+ * user allocation. By default with no extensions or no
+ * extension callback handling, just the normal input buffer is
+ * used then so it is efficient.
+ */
+
+ eff_buf.token = (char *)buf;
+
+ more = 1;
+ while (more) {
+
+ more = 0;
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ m = wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_PACKET_RX_PREPARSE,
+ wsi->active_extensions_user[n],
+ &eff_buf, 0);
+ if (m < 0) {
+ fprintf(stderr, "Extension reports fatal error\n");
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_NOSTATUS);
+ return 1;
+ }
+ if (m)
+ more = 1;
+ }
+
+ /* service incoming data */
+
+ if (eff_buf.token_len) {
+ n = libwebsocket_read(context, wsi,
+ (unsigned char *)eff_buf.token, eff_buf.token_len);
+ if (n < 0)
+ /* we closed wsi */
+ return 1;
+ }
+
+ eff_buf.token = NULL;
+ eff_buf.token_len = 0;
+ }
+ break;
+ }
+
+ return 0;
+}
+
+
+/**
+ * libwebsocket_context_destroy() - Destroy the websocket context
+ * @context: Websocket context
+ *
+ * This function closes any active connections and then frees the
+ * context. After calling this, any further use of the context is
+ * undefined.
+ */
+void
+libwebsocket_context_destroy(struct libwebsocket_context *context)
+{
+ int n;
+ int m;
+ struct libwebsocket *wsi;
+ struct libwebsocket_extension *ext;
+
+ for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
+ for (m = 0; m < context->fd_hashtable[n].length; m++) {
+ wsi = context->fd_hashtable[n].wsi[m];
+ libwebsocket_close_and_free_session(context, wsi,
+ LWS_CLOSE_STATUS_GOINGAWAY);
+ }
+
+ /*
+ * give all extensions a chance to clean up any per-context
+ * allocations they might have made
+ */
+
+ ext = context->extensions;
+ m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_DESTRUCT;
+ if (context->listen_port)
+ m = LWS_EXT_CALLBACK_SERVER_CONTEXT_DESTRUCT;
+ while (ext->callback) {
+ ext->callback(context, ext, NULL, m, NULL, NULL, 0);
+ ext++;
+ }
+
+#ifdef WIN32
+#else
+ close(context->fd_random);
+#endif
+
+#ifdef LWS_OPENSSL_SUPPORT
+ if (context->ssl_ctx)
+ SSL_CTX_free(context->ssl_ctx);
+ if (context->ssl_client_ctx)
+ SSL_CTX_free(context->ssl_client_ctx);
+#endif
+
+ free(context);
+
+#ifdef WIN32
+ WSACleanup();
+#endif
+}
+
+/**
+ * libwebsocket_service() - Service any pending websocket activity
+ * @context: Websocket context
+ * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed
+ * service otherwise block and service immediately, returning
+ * after the timeout if nothing needed service.
+ *
+ * This function deals with any pending websocket traffic, for three
+ * kinds of event. It handles these events on both server and client
+ * types of connection the same.
+ *
+ * 1) Accept new connections to our context's server
+ *
+ * 2) Perform pending broadcast writes initiated from other forked
+ * processes (effectively serializing asynchronous broadcasts)
+ *
+ * 3) Call the receive callback for incoming frame data received by
+ * server or client connections.
+ *
+ * You need to call this service function periodically to all the above
+ * functions to happen; if your application is single-threaded you can
+ * just call it in your main event loop.
+ *
+ * Alternatively you can fork a new process that asynchronously handles
+ * calling this service in a loop. In that case you are happy if this
+ * call blocks your thread until it needs to take care of something and
+ * would call it with a large nonzero timeout. Your loop then takes no
+ * CPU while there is nothing happening.
+ *
+ * If you are calling it in a single-threaded app, you don't want it to
+ * wait around blocking other things in your loop from happening, so you
+ * would call it with a timeout_ms of 0, so it returns immediately if
+ * nothing is pending, or as soon as it services whatever was pending.
+ */
+
+
+int
+libwebsocket_service(struct libwebsocket_context *context, int timeout_ms)
+{
+ int n;
+
+ /* stay dead once we are dead */
+
+ if (context == NULL)
+ return 1;
+
+ /* wait for something to need service */
+
+ n = poll(context->fds, context->fds_count, timeout_ms);
+ if (n == 0) /* poll timeout */
+ return 0;
+
+ if (n < 0) {
+ /*
+ fprintf(stderr, "Listen Socket dead\n");
+ */
+ return 1;
+ }
+
+ /* handle accept on listening socket? */
+
+ for (n = 0; n < context->fds_count; n++)
+ if (context->fds[n].revents)
+ libwebsocket_service_fd(context, &context->fds[n]);
+
+ return 0;
+}
+
+int
+lws_any_extension_handled(struct libwebsocket_context *context,
+ struct libwebsocket *wsi,
+ enum libwebsocket_extension_callback_reasons r,
+ void *v, size_t len)
+{
+ int n;
+ int handled = 0;
+
+ /* maybe an extension will take care of it for us */
+
+ for (n = 0; n < wsi->count_active_extensions && !handled; n++) {
+ if (!wsi->active_extensions[n]->callback)
+ continue;
+
+ handled |= wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ r, wsi->active_extensions_user[n], v, len);
+ }
+
+ return handled;
+}
+
+
+void *
+lws_get_extension_user_matching_ext(struct libwebsocket *wsi,
+ struct libwebsocket_extension * ext)
+{
+ int n = 0;
+
+ if (wsi == NULL)
+ return NULL;
+
+ while (n < wsi->count_active_extensions) {
+ if (wsi->active_extensions[n] != ext) {
+ n++;
+ continue;
+ }
+ return wsi->active_extensions_user[n];
+ }
+
+ return NULL;
+}
+
+/**
+ * libwebsocket_callback_on_writable() - Request a callback when this socket
+ * becomes able to be written to without
+ * blocking
+ *
+ * @context: libwebsockets context
+ * @wsi: Websocket connection instance to get callback for
+ */
+
+int
+libwebsocket_callback_on_writable(struct libwebsocket_context *context,
+ struct libwebsocket *wsi)
+{
+ int n;
+ int handled = 0;
+
+ /* maybe an extension will take care of it for us */
+
+ for (n = 0; n < wsi->count_active_extensions; n++) {
+ if (!wsi->active_extensions[n]->callback)
+ continue;
+
+ handled |= wsi->active_extensions[n]->callback(context,
+ wsi->active_extensions[n], wsi,
+ LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE,
+ wsi->active_extensions_user[n], NULL, 0);
+ }
+
+ if (handled)
+ return 1;
+
+ for (n = 0; n < context->fds_count; n++)
+ if (context->fds[n].fd == wsi->sock) {
+ context->fds[n].events |= POLLOUT;
+ n = context->fds_count + 1;
+ }
+
+ if (n == context->fds_count)
+ fprintf(stderr, "libwebsocket_callback_on_writable: failed to find socket %d\n", wsi->sock);
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_SET_MODE_POLL_FD,
+ (void *)(long)wsi->sock, NULL, POLLOUT);
+
+ return 1;
+}
+
+/**
+ * libwebsocket_callback_on_writable_all_protocol() - Request a callback for
+ * all connections using the given protocol when it
+ * becomes possible to write to each socket without
+ * blocking in turn.
+ *
+ * @protocol: Protocol whose connections will get callbacks
+ */
+
+int
+libwebsocket_callback_on_writable_all_protocol(
+ const struct libwebsocket_protocols *protocol)
+{
+ struct libwebsocket_context *context = protocol->owning_server;
+ int n;
+ int m;
+ struct libwebsocket *wsi;
+
+ for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
+
+ for (m = 0; m < context->fd_hashtable[n].length; m++) {
+
+ wsi = context->fd_hashtable[n].wsi[m];
+
+ if (wsi->protocol == protocol)
+ libwebsocket_callback_on_writable(context, wsi);
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
+ *
+ * You will not need this unless you are doing something special
+ *
+ * @wsi: Websocket connection instance
+ * @reason: timeout reason
+ * @secs: how many seconds
+ */
+
+void
+libwebsocket_set_timeout(struct libwebsocket *wsi,
+ enum pending_timeout reason, int secs)
+{
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+
+ wsi->pending_timeout_limit = tv.tv_sec + secs;
+ wsi->pending_timeout = reason;
+}
+
+
+/**
+ * libwebsocket_get_socket_fd() - returns the socket file descriptor
+ *
+ * You will not need this unless you are doing something special
+ *
+ * @wsi: Websocket connection instance
+ */
+
+int
+libwebsocket_get_socket_fd(struct libwebsocket *wsi)
+{
+ return wsi->sock;
+}
+
+/**
+ * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
+ * receieved packets.
+ *
+ * If the output side of a server process becomes choked, this allows flow
+ * control for the input side.
+ *
+ * @wsi: Websocket connection instance to get callback for
+ * @enable: 0 = disable read servicing for this connection, 1 = enable
+ */
+
+int
+libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
+{
+ struct libwebsocket_context *context = wsi->protocol->owning_server;
+ int n;
+
+ for (n = 0; n < context->fds_count; n++)
+ if (context->fds[n].fd == wsi->sock) {
+ if (enable)
+ context->fds[n].events |= POLLIN;
+ else
+ context->fds[n].events &= ~POLLIN;
+
+ return 0;
+ }
+
+ if (enable)
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_SET_MODE_POLL_FD,
+ (void *)(long)wsi->sock, NULL, POLLIN);
+ else
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_CLEAR_MODE_POLL_FD,
+ (void *)(long)wsi->sock, NULL, POLLIN);
+
+#if 0
+ fprintf(stderr, "libwebsocket_rx_flow_control "
+ "unable to find socket\n");
+#endif
+ return 1;
+}
+
+/**
+ * libwebsocket_canonical_hostname() - returns this host's hostname
+ *
+ * This is typically used by client code to fill in the host parameter
+ * when making a client connection. You can only call it after the context
+ * has been created.
+ *
+ * @context: Websocket context
+ */
- /*
- * only broadcast to connections using
- * the requested protocol
- */
- if (this->wsi[n]->protocol->protocol_index !=
- (unsigned long)this->wsi[client])
- continue;
+extern const char *
+libwebsocket_canonical_hostname(struct libwebsocket_context *context)
+{
+ return (const char *)context->canonical_hostname;
+}
- this->wsi[n]->protocol-> callback(this->wsi[n],
- LWS_CALLBACK_BROADCAST,
- this->wsi[n]->user_space,
- buf + LWS_SEND_BUFFER_PRE_PADDING, len);
- }
- continue;
- }
+static void sigpipe_handler(int x)
+{
+}
#ifdef LWS_OPENSSL_SUPPORT
- if (this->use_ssl)
- n = SSL_read(this->wsi[client]->ssl, buf, sizeof buf);
- else
-#endif
- n = recv(this->fds[client].fd, buf, sizeof buf, 0);
-
- if (n < 0) {
- fprintf(stderr, "Socket read returned %d\n", n);
- continue;
- }
- if (!n) {
-/* fprintf(stderr, "POLLIN with 0 len waiting\n"); */
- libwebsocket_close_and_free_session(
- this->wsi[client]);
- goto nuke_this;
- }
+static int
+OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
+{
+ SSL *ssl;
+ int n;
+ struct libwebsocket_context *context;
- /* service incoming data */
+ ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
+ SSL_get_ex_data_X509_STORE_CTX_idx());
- if (libwebsocket_read(this->wsi[client], buf, n) >= 0)
- continue;
-
- /*
- * it closed and nuked wsi[client], so remove the
- * socket handle and wsi from our service list
- */
-nuke_this:
+ /*
+ * !!! nasty openssl requires the index to come as a library-scope
+ * static
+ */
+ context = SSL_get_ex_data(ssl, openssl_websocket_private_data_index);
+
+ n = context->protocols[0].callback(NULL, NULL,
+ LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION,
+ x509_ctx, ssl, preverify_ok);
- debug("nuking wsi %p, fsd_count = %d\n",
- this->wsi[client], this->fds_count - 1);
+ /* convert return code from 0 = OK to 1 = OK */
- this->fds_count--;
- for (n = client; n < this->fds_count; n++) {
- this->fds[n] = this->fds[n + 1];
- this->wsi[n] = this->wsi[n + 1];
- }
- break;
- }
+ if (!n)
+ n = 1;
+ else
+ n = 0;
- return 0;
+ return n;
}
-
+#endif
/**
- * libwebsocket_create_server() - Create the listening websockets server
- * @port: Port to listen on
+ * libwebsocket_create_context() - Create the websocket handler
+ * @port: Port to listen on... you can use 0 to suppress listening on
+ * any port, that's what you want if you are not running a
+ * websocket server at all but just using it as a client
+ * @interf: NULL to bind the listen socket to all interfaces, or the
+ * interface name, eg, "eth2"
* @protocols: Array of structures listing supported protocols and a protocol-
- * specific callback for each one. The list is ended with an
- * entry that has a NULL callback pointer.
- * It's not const because we write the owning_server member
+ * specific callback for each one. The list is ended with an
+ * entry that has a NULL callback pointer.
+ * It's not const because we write the owning_server member
+ * @extensions: NULL or array of libwebsocket_extension structs listing the
+ * extensions this context supports
* @ssl_cert_filepath: If libwebsockets was compiled to use ssl, and you want
- * to listen using SSL, set to the filepath to fetch the
- * server cert from, otherwise NULL for unencrypted
+ * to listen using SSL, set to the filepath to fetch the
+ * server cert from, otherwise NULL for unencrypted
* @ssl_private_key_filepath: filepath to private key if wanting SSL mode,
- * else ignored
+ * else ignored
* @gid: group id to change to after setting listen socket, or -1.
* @uid: user id to change to after setting listen socket, or -1.
- *
- * This function creates the listening socket and takes care
- * of all initialization in one step.
- *
- * After initialization, it forks a thread that will sits in a service loop
- * and returns to the caller. The actual service actions are performed by
- * user code in a per-protocol callback from the appropriate one selected
- * by the client from the list in @protocols.
- *
- * The protocol callback functions are called for a handful of events
- * including http requests coming in, websocket connections becoming
- * established, and data arriving; it's also called periodically to allow
- * async transmission.
- *
- * HTTP requests are sent always to the FIRST protocol in @protocol, since
- * at that time websocket protocol has not been negotiated. Other
- * protocols after the first one never see any HTTP callack activity.
- *
- * The server created is a simple http server by default; part of the
- * websocket standard is upgrading this http connection to a websocket one.
- *
- * This allows the same server to provide files like scripts and favicon /
- * images or whatever over http and dynamic data over websockets all in
- * one place; they're all handled in the user callback.
+ * @options: 0, or LWS_SERVER_OPTION_DEFEAT_CLIENT_MASK
+ *
+ * This function creates the listening socket and takes care
+ * of all initialization in one step.
+ *
+ * After initialization, it returns a struct libwebsocket_context * that
+ * represents this server. After calling, user code needs to take care
+ * of calling libwebsocket_service() with the context pointer to get the
+ * server's sockets serviced. This can be done in the same process context
+ * or a forked process, or another thread,
+ *
+ * The protocol callback functions are called for a handful of events
+ * including http requests coming in, websocket connections becoming
+ * established, and data arriving; it's also called periodically to allow
+ * async transmission.
+ *
+ * HTTP requests are sent always to the FIRST protocol in @protocol, since
+ * at that time websocket protocol has not been negotiated. Other
+ * protocols after the first one never see any HTTP callack activity.
+ *
+ * The server created is a simple http server by default; part of the
+ * websocket standard is upgrading this http connection to a websocket one.
+ *
+ * This allows the same server to provide files like scripts and favicon /
+ * images or whatever over http and dynamic data over websockets all in
+ * one place; they're all handled in the user callback.
*/
-int libwebsocket_create_server(int port,
+struct libwebsocket_context *
+libwebsocket_create_context(int port, const char *interf,
struct libwebsocket_protocols *protocols,
- const char * ssl_cert_filepath,
- const char * ssl_private_key_filepath,
- int gid, int uid)
+ struct libwebsocket_extension *extensions,
+ const char *ssl_cert_filepath,
+ const char *ssl_private_key_filepath,
+ int gid, int uid, unsigned int options)
{
int n;
- int client;
- int sockfd;
+ int m;
+ int sockfd = 0;
int fd;
- unsigned int clilen;
struct sockaddr_in serv_addr, cli_addr;
int opt = 1;
- struct libwebsocket_context * this = NULL;
+ struct libwebsocket_context *context = NULL;
unsigned int slen;
+ char *p;
+ char hostname[1024];
+ struct hostent *he;
+ struct libwebsocket *wsi;
#ifdef LWS_OPENSSL_SUPPORT
SSL_METHOD *method;
char ssl_err_buf[512];
+#endif
- use_ssl = ssl_cert_filepath != NULL && ssl_private_key_filepath != NULL;
- if (use_ssl)
- fprintf(stderr, " Compiled with SSL support, using it\n");
- else
- fprintf(stderr, " Compiled with SSL support, not using it\n");
+#ifdef _WIN32
+ {
+ WORD wVersionRequested;
+ WSADATA wsaData;
+ int err;
+ HMODULE wsdll;
+
+ /* Use the MAKEWORD(lowbyte, highbyte) macro from Windef.h */
+ wVersionRequested = MAKEWORD(2, 2);
+
+ err = WSAStartup(wVersionRequested, &wsaData);
+ if (err != 0) {
+ /* Tell the user that we could not find a usable */
+ /* Winsock DLL. */
+ fprintf(stderr, "WSAStartup failed with error: %d\n",
+ err);
+ return NULL;
+ }
+
+ wsdll = GetModuleHandle("Ws2_32.dll");
+ if (wsdll)
+ {
+ poll = (PFNWSAPOLL)GetProcAddress(wsdll, "WSAPoll");
+ }
+
+ if (!poll)
+ {
+ poll = emulated_poll;
+ }
+ }
+#endif
+
+
+ context = malloc(sizeof(struct libwebsocket_context));
+ if (!context) {
+ fprintf(stderr, "No memory for websocket context\n");
+ return NULL;
+ }
+ context->protocols = protocols;
+ context->listen_port = port;
+ context->http_proxy_port = 0;
+ context->http_proxy_address[0] = '\0';
+ context->options = options;
+ context->fds_count = 0;
+ context->extensions = extensions;
+
+#ifdef WIN32
+ context->fd_random = 0;
+#else
+ context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
+ if (context->fd_random < 0) {
+ fprintf(stderr, "Unable to open random device %s %d\n",
+ SYSTEM_RANDOM_FILEPATH, context->fd_random);
+ return NULL;
+ }
+#endif
+
+#ifdef LWS_OPENSSL_SUPPORT
+ context->use_ssl = 0;
+ context->ssl_ctx = NULL;
+ context->ssl_client_ctx = NULL;
+ openssl_websocket_private_data_index = 0;
+#endif
+ /* find canonical hostname */
+
+ hostname[(sizeof hostname) - 1] = '\0';
+ gethostname(hostname, (sizeof hostname) - 1);
+ he = gethostbyname(hostname);
+ if (he) {
+ strncpy(context->canonical_hostname, he->h_name,
+ sizeof context->canonical_hostname - 1);
+ context->canonical_hostname[
+ sizeof context->canonical_hostname - 1] = '\0';
+ } else
+ strncpy(context->canonical_hostname, hostname,
+ sizeof context->canonical_hostname - 1);
+
+ /* split the proxy ads:port if given */
+
+ p = getenv("http_proxy");
+ if (p) {
+ strncpy(context->http_proxy_address, p,
+ sizeof context->http_proxy_address - 1);
+ context->http_proxy_address[
+ sizeof context->http_proxy_address - 1] = '\0';
+
+ p = strchr(context->http_proxy_address, ':');
+ if (p == NULL) {
+ fprintf(stderr, "http_proxy needs to be ads:port\n");
+ return NULL;
+ }
+ *p = '\0';
+ context->http_proxy_port = atoi(p + 1);
+
+ fprintf(stderr, "Using proxy %s:%u\n",
+ context->http_proxy_address,
+ context->http_proxy_port);
+ }
+
+ if (port) {
+
+#ifdef LWS_OPENSSL_SUPPORT
+ context->use_ssl = ssl_cert_filepath != NULL &&
+ ssl_private_key_filepath != NULL;
+ if (context->use_ssl)
+ fprintf(stderr, " Compiled with SSL support, "
+ "using it\n");
+ else
+ fprintf(stderr, " Compiled with SSL support, "
+ "not using it\n");
#else
- if (ssl_cert_filepath != NULL && ssl_private_key_filepath != NULL) {
- fprintf(stderr, " Not compiled for OpenSSl support!\n");
- return -1;
+ if (ssl_cert_filepath != NULL &&
+ ssl_private_key_filepath != NULL) {
+ fprintf(stderr, " Not compiled for OpenSSl support!\n");
+ return NULL;
+ }
+ fprintf(stderr, " Compiled without SSL support, "
+ "serving unencrypted\n");
+#endif
}
- fprintf(stderr, " Compiled without SSL support, serving unencrypted\n");
+
+ /* ignore SIGPIPE */
+#ifdef WIN32
+#else
+ signal(SIGPIPE, sigpipe_handler);
#endif
+
#ifdef LWS_OPENSSL_SUPPORT
- if (use_ssl) {
- SSL_library_init();
- OpenSSL_add_all_algorithms();
- SSL_load_error_strings();
+ /* basic openssl init */
- /*
- * Firefox insists on SSLv23 not SSLv3
- * Konq disables SSLv2 by default now, SSLv23 works
- */
+ SSL_library_init();
+
+ OpenSSL_add_all_algorithms();
+ SSL_load_error_strings();
+
+ openssl_websocket_private_data_index =
+ SSL_get_ex_new_index(0, "libwebsockets", NULL, NULL, NULL);
+
+ /*
+ * Firefox insists on SSLv23 not SSLv3
+ * Konq disables SSLv2 by default now, SSLv23 works
+ */
- method = (SSL_METHOD *)SSLv23_server_method();
+ method = (SSL_METHOD *)SSLv23_server_method();
+ if (!method) {
+ fprintf(stderr, "problem creating ssl method: %s\n",
+ ERR_error_string(ERR_get_error(), ssl_err_buf));
+ return NULL;
+ }
+ context->ssl_ctx = SSL_CTX_new(method); /* create context */
+ if (!context->ssl_ctx) {
+ fprintf(stderr, "problem creating ssl context: %s\n",
+ ERR_error_string(ERR_get_error(), ssl_err_buf));
+ return NULL;
+ }
+
+ /* client context */
+ if (port == CONTEXT_PORT_NO_LISTEN)
+ {
+ method = (SSL_METHOD *)SSLv23_client_method();
if (!method) {
fprintf(stderr, "problem creating ssl method: %s\n",
ERR_error_string(ERR_get_error(), ssl_err_buf));
- return -1;
+ return NULL;
}
- ssl_ctx = SSL_CTX_new(method); /* create context */
- if (!ssl_ctx) {
- printf("problem creating ssl context: %s\n",
+ /* create context */
+ context->ssl_client_ctx = SSL_CTX_new(method);
+ if (!context->ssl_client_ctx) {
+ fprintf(stderr, "problem creating ssl context: %s\n",
ERR_error_string(ERR_get_error(), ssl_err_buf));
- return -1;
+ return NULL;
}
+
+ /* openssl init for cert verification (for client sockets) */
+
+ if (!SSL_CTX_load_verify_locations(
+ context->ssl_client_ctx, NULL,
+ LWS_OPENSSL_CLIENT_CERTS))
+ fprintf(stderr,
+ "Unable to load SSL Client certs from %s "
+ "(set by --with-client-cert-dir= in configure) -- "
+ " client ssl isn't going to work",
+ LWS_OPENSSL_CLIENT_CERTS);
+
+ /*
+ * callback allowing user code to load extra verification certs
+ * helping the client to verify server identity
+ */
+
+ context->protocols[0].callback(context, NULL,
+ LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS,
+ context->ssl_client_ctx, NULL, 0);
+ }
+ /* as a server, are we requiring clients to identify themselves? */
+
+ if (options & LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT) {
+
+ /* absolutely require the client cert */
+
+ SSL_CTX_set_verify(context->ssl_ctx,
+ SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+ OpenSSL_verify_callback);
+
+ /*
+ * give user code a chance to load certs into the server
+ * allowing it to verify incoming client certs
+ */
+
+ context->protocols[0].callback(context, NULL,
+ LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS,
+ context->ssl_ctx, NULL, 0);
+ }
+
+ if (context->use_ssl) {
+
+ /* openssl init for server sockets */
+
/* set the local certificate from CertFile */
- n = SSL_CTX_use_certificate_file(ssl_ctx,
+ n = SSL_CTX_use_certificate_file(context->ssl_ctx,
ssl_cert_filepath, SSL_FILETYPE_PEM);
if (n != 1) {
fprintf(stderr, "problem getting cert '%s': %s\n",
ssl_cert_filepath,
ERR_error_string(ERR_get_error(), ssl_err_buf));
- return -1;
+ return NULL;
}
/* set the private key from KeyFile */
- if (SSL_CTX_use_PrivateKey_file(ssl_ctx,
- ssl_private_key_filepath,
- SSL_FILETYPE_PEM) != 1) {
+ if (SSL_CTX_use_PrivateKey_file(context->ssl_ctx,
+ ssl_private_key_filepath, SSL_FILETYPE_PEM) != 1) {
fprintf(stderr, "ssl problem getting key '%s': %s\n",
ssl_private_key_filepath,
ERR_error_string(ERR_get_error(), ssl_err_buf));
- return (-1);
+ return NULL;
}
/* verify private key */
- if (!SSL_CTX_check_private_key(ssl_ctx)) {
+ if (!SSL_CTX_check_private_key(context->ssl_ctx)) {
fprintf(stderr, "Private SSL key doesn't match cert\n");
- return (-1);
+ return NULL;
}
/* SSL is happy and has a cert it's content with */
}
#endif
- this = malloc(sizeof (struct libwebsocket_context));
+ /* selftest */
+
+ if (lws_b64_selftest())
+ return NULL;
+
+ /* fd hashtable init */
+
+ for (n = 0; n < FD_HASHTABLE_MODULUS; n++)
+ context->fd_hashtable[n].length = 0;
/* set up our external listening socket we serve on */
-
- sockfd = socket(AF_INET, SOCK_STREAM, 0);
- if (sockfd < 0) {
- fprintf(stderr, "ERROR opening socket");
- return -1;
- }
-
- /* allow us to restart even if old sockets in TIME_WAIT */
- setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
- bzero((char *) &serv_addr, sizeof(serv_addr));
- serv_addr.sin_family = AF_INET;
- serv_addr.sin_addr.s_addr = INADDR_ANY;
- serv_addr.sin_port = htons(port);
+ if (port) {
- n = bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
- if (n < 0) {
- fprintf(stderr, "ERROR on binding to port %d (%d %d)\n", port, n,
- errno);
- return -1;
- }
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd < 0) {
+ fprintf(stderr, "ERROR opening socket");
+ return NULL;
+ }
- /* drop any root privs for this process */
+ /* allow us to restart even if old sockets in TIME_WAIT */
+ setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&opt, sizeof(opt));
+
+
+ /* Disable Nagle */
+ opt = 1;
+ setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (const void *)&opt, sizeof(opt));
+
+ bzero((char *) &serv_addr, sizeof(serv_addr));
+ serv_addr.sin_family = AF_INET;
+ if (interf == NULL)
+ serv_addr.sin_addr.s_addr = INADDR_ANY;
+ else
+ interface_to_sa(interf, &serv_addr,
+ sizeof(serv_addr));
+ serv_addr.sin_port = htons(port);
+
+ n = bind(sockfd, (struct sockaddr *) &serv_addr,
+ sizeof(serv_addr));
+ if (n < 0) {
+ fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
+ port, n, errno);
+ return NULL;
+ }
+
+ wsi = malloc(sizeof(struct libwebsocket));
+ memset(wsi, 0, sizeof (struct libwebsocket));
+ wsi->sock = sockfd;
+ wsi->count_active_extensions = 0;
+ wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
+ insert_wsi(context, wsi);
+
+ listen(sockfd, 5);
+ fprintf(stderr, " Listening on port %d\n", port);
+ /* list in the internal poll array */
+
+ context->fds[context->fds_count].fd = sockfd;
+ context->fds[context->fds_count++].events = POLLIN;
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_ADD_POLL_FD,
+ (void *)(long)sockfd, NULL, POLLIN);
+
+ }
+
+ /* drop any root privs for this process */
+#ifdef WIN32
+#else
if (gid != -1)
if (setgid(gid))
fprintf(stderr, "setgid: %s\n", strerror(errno));
if (uid != -1)
if (setuid(uid))
fprintf(stderr, "setuid: %s\n", strerror(errno));
-
- /*
- * prepare the poll() fd array... it's like this
- *
- * [0] = external listening socket
- * [1 .. this->count_protocols] = per-protocol broadcast sockets
- * [this->count_protocols + 1 ... this->fds_count-1] = connection skts
- */
-
- this->fds_count = 1;
- this->fds[0].fd = sockfd;
- this->fds[0].events = POLLIN;
- this->count_protocols = 0;
-#ifdef LWS_OPENSSL_SUPPORT
- this->use_ssl = use_ssl;
#endif
- listen(sockfd, 5);
- fprintf(stderr, " Listening on port %d\n", port);
-
/* set up our internal broadcast trigger sockets per-protocol */
- for (; protocols[this->count_protocols].callback;
- this->count_protocols++) {
- protocols[this->count_protocols].owning_server = this;
- protocols[this->count_protocols].protocol_index =
- this->count_protocols;
+ for (context->count_protocols = 0;
+ protocols[context->count_protocols].callback;
+ context->count_protocols++) {
+
+ fprintf(stderr, " Protocol: %s\n", protocols[context->count_protocols].name);
+
+ protocols[context->count_protocols].owning_server = context;
+ protocols[context->count_protocols].protocol_index =
+ context->count_protocols;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
fprintf(stderr, "ERROR opening socket");
- return -1;
+ return NULL;
}
-
+
/* allow us to restart even if old sockets in TIME_WAIT */
- setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const void *)&opt, sizeof(opt));
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
n = bind(fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
if (n < 0) {
- fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
+ fprintf(stderr, "ERROR on binding to port %d (%d %d)\n",
port, n, errno);
- return -1;
+ return NULL;
}
slen = sizeof cli_addr;
n = getsockname(fd, (struct sockaddr *)&cli_addr, &slen);
if (n < 0) {
fprintf(stderr, "getsockname failed\n");
- return -1;
+ return NULL;
}
- protocols[this->count_protocols].broadcast_socket_port =
+ protocols[context->count_protocols].broadcast_socket_port =
ntohs(cli_addr.sin_port);
listen(fd, 5);
debug(" Protocol %s broadcast socket %d\n",
- protocols[this->count_protocols].name,
+ protocols[context->count_protocols].name,
ntohs(cli_addr.sin_port));
- this->fds[this->fds_count].fd = fd;
- this->fds[this->fds_count].events = POLLIN;
- /* wsi only exists for connections, not broadcast listener */
- this->wsi[this->fds_count] = NULL;
- this->fds_count++;
+ /* dummy wsi per broadcast proxy socket */
+
+ wsi = malloc(sizeof(struct libwebsocket));
+ memset(wsi, 0, sizeof (struct libwebsocket));
+ wsi->sock = fd;
+ wsi->mode = LWS_CONNMODE_BROADCAST_PROXY_LISTENER;
+ wsi->count_active_extensions = 0;
+ /* note which protocol we are proxying */
+ wsi->protocol_index_for_broadcast_proxy =
+ context->count_protocols;
+ insert_wsi(context, wsi);
+
+ /* list in internal poll array */
+
+ context->fds[context->fds_count].fd = fd;
+ context->fds[context->fds_count].events = POLLIN;
+ context->fds[context->fds_count].revents = 0;
+ context->fds_count++;
+
+ /* external POLL support via protocol 0 */
+ context->protocols[0].callback(context, wsi,
+ LWS_CALLBACK_ADD_POLL_FD,
+ (void *)(long)fd, NULL, POLLIN);
}
-
/*
- * We will enter out poll and service loop now, just before that
- * fork and return to caller for the main thread of execution
+ * give all extensions a chance to create any per-context
+ * allocations they need
*/
- n = fork();
- if (n < 0) {
- fprintf(stderr, "Failed to fork websocket poll loop\n");
- return -1;
+ m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_CONSTRUCT;
+ if (port)
+ m = LWS_EXT_CALLBACK_SERVER_CONTEXT_CONSTRUCT;
+ while (extensions->callback) {
+ fprintf(stderr, " Extension: %s\n", extensions->name);
+ extensions->callback(context, extensions,
+ NULL, m, NULL, NULL, 0);
+ extensions++;
}
- if (n) {
- /* original process context */
+
+ return context;
+}
+
+
+#ifndef LWS_NO_FORK
+
+/**
+ * libwebsockets_fork_service_loop() - Optional helper function forks off
+ * a process for the websocket server loop.
+ * You don't have to use this but if not, you
+ * have to make sure you are calling
+ * libwebsocket_service periodically to service
+ * the websocket traffic
+ * @context: server context returned by creation function
+ */
+
+int
+libwebsockets_fork_service_loop(struct libwebsocket_context *context)
+{
+ int fd;
+ struct sockaddr_in cli_addr;
+ int n;
+ int p;
+
+ n = fork();
+ if (n < 0)
+ return n;
+
+ if (!n) {
+
+ /* main process context */
/*
- * before we return to caller, we set up per-protocol
- * broadcast sockets connected to the server ready to use
+ * set up the proxy sockets to allow broadcast from
+ * service process context
*/
- /* give server fork a chance to start up */
- usleep(500000);
-
- for (client = 1; client < this->count_protocols + 1; client++) {
+ for (p = 0; p < context->count_protocols; p++) {
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
- fprintf(stderr,"Unable to create socket\n");
+ fprintf(stderr, "Unable to create socket\n");
return -1;
}
cli_addr.sin_family = AF_INET;
cli_addr.sin_port = htons(
- protocols[client - 1].broadcast_socket_port);
+ context->protocols[p].broadcast_socket_port);
cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
n = connect(fd, (struct sockaddr *)&cli_addr,
sizeof cli_addr);
if (n < 0) {
fprintf(stderr, "Unable to connect to "
"broadcast socket %d, %s\n",
- client, strerror(errno));
+ n, strerror(errno));
return -1;
}
- protocols[client - 1].broadcast_socket_user_fd = fd;
+ context->protocols[p].broadcast_socket_user_fd = fd;
}
- fprintf(stderr, "libwebsocket poll process forked\n");
-
return 0;
}
prctl(PR_SET_PDEATHSIG, SIGHUP);
/* in this forked process, sit and service websocket connections */
-
- while (1) {
-
- n = poll(this->fds, this->fds_count, 1000);
-
- if (n < 0 || this->fds[0].revents & (POLLERR | POLLHUP)) {
- fprintf(stderr, "Listen Socket dead\n");
- goto fatal;
- }
- if (n == 0) /* poll timeout */
- continue;
-
- /* handle accept on listening socket? */
-
- for (client = 0; client < this->count_protocols + 1; client++) {
-
- if (!this->fds[client].revents & POLLIN)
- continue;
-
- /* listen socket got an unencrypted connection... */
-
- clilen = sizeof(cli_addr);
- fd = accept(this->fds[client].fd,
- (struct sockaddr *)&cli_addr, &clilen);
- if (fd < 0) {
- fprintf(stderr, "ERROR on accept");
- continue;
- }
-
- if (this->fds_count >= MAX_CLIENTS) {
- fprintf(stderr, "too busy");
- close(fd);
- continue;
- }
- if (client) {
- /*
- * accepting a connection to broadcast socket
- * set wsi to be protocol index not pointer
- */
-
- this->wsi[this->fds_count] =
- (struct libwebsocket *)(long)(client - 1);
-
- goto fill_in_fds;
- }
-
- /* accepting connection to main listener */
-
- this->wsi[this->fds_count] =
- malloc(sizeof(struct libwebsocket));
- if (!this->wsi[this->fds_count])
- return -1;
-
- #ifdef LWS_OPENSSL_SUPPORT
- if (this->use_ssl) {
-
- this->wsi[this->fds_count]->ssl =
- SSL_new(ssl_ctx);
- if (this->wsi[this->fds_count]->ssl == NULL) {
- fprintf(stderr, "SSL_new failed: %s\n",
- ERR_error_string(SSL_get_error(
- this->wsi[this->fds_count]->ssl, 0),
- NULL));
- free(this->wsi[this->fds_count]);
- continue;
- }
-
- SSL_set_fd(this->wsi[this->fds_count]->ssl, fd);
-
- n = SSL_accept(this->wsi[this->fds_count]->ssl);
- if (n != 1) {
- /*
- * browsers seem to probe with various
- * ssl params which fail then retry
- * and succeed
- */
- debug("SSL_accept failed skt %u: %s\n",
- fd,
- ERR_error_string(SSL_get_error(
- this->wsi[this->fds_count]->ssl,
- n), NULL));
- SSL_free(
- this->wsi[this->fds_count]->ssl);
- free(this->wsi[this->fds_count]);
- continue;
- }
- debug("accepted new SSL conn "
- "port %u on fd=%d SSL ver %s\n",
- ntohs(cli_addr.sin_port), fd,
- SSL_get_version(this->wsi[
- this->fds_count]->ssl));
-
- } else
- #endif
- debug("accepted new conn port %u on fd=%d\n",
- ntohs(cli_addr.sin_port), fd);
-
- /* intialize the instance struct */
-
- this->wsi[this->fds_count]->sock = fd;
- this->wsi[this->fds_count]->state = WSI_STATE_HTTP;
- this->wsi[this->fds_count]->name_buffer_pos = 0;
-
- for (n = 0; n < WSI_TOKEN_COUNT; n++) {
- this->wsi[this->fds_count]->
- utf8_token[n].token = NULL;
- this->wsi[this->fds_count]->
- utf8_token[n].token_len = 0;
- }
-
- /*
- * these can only be set once the protocol is known
- * we set an unestablished connection's protocol pointer
- * to the start of the supported list, so it can look
- * for matching ones during the handshake
- */
- this->wsi[this->fds_count]->protocol = protocols;
- this->wsi[this->fds_count]->user_space = NULL;
-
- /*
- * Default protocol is 76
- * After 76, there's a header specified to inform which
- * draft the client wants, when that's seen we modify
- * the individual connection's spec revision accordingly
- */
- this->wsi[this->fds_count]->ietf_spec_revision = 76;
-
-fill_in_fds:
-
- /*
- * make sure NO events are seen yet on this new socket
- * (otherwise we inherit old fds[client].revents from
- * previous socket there and die mysteriously! )
- */
- this->fds[this->fds_count].revents = 0;
-
- this->fds[this->fds_count].events = POLLIN;
- this->fds[this->fds_count++].fd = fd;
-
- }
-
-
- /* service anything incoming on websocket connection */
-
- libwebsocket_poll_connections(this);
- }
-
-fatal:
-
- /* close listening skt and per-protocol broadcast sockets */
- for (client = 0; client < this->fds_count; client++)
- close(this->fds[0].fd);
-
-#ifdef LWS_OPENSSL_SUPPORT
- SSL_CTX_free(ssl_ctx);
-#endif
- kill(0, SIGTERM);
+ while (1)
+ if (libwebsocket_service(context, 1000))
+ return -1;
- if (this)
- free(this);
-
return 0;
}
+#endif
+
/**
* libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
- * connection.
+ * connection.
* @wsi: pointer to struct websocket you want to know the protocol of
*
- *
- * This is useful to get the protocol to broadcast back to from inside
+ *
+ * This is useful to get the protocol to broadcast back to from inside
* the callback.
*/
}
/**
- * libwebsockets_broadcast() - Sends a buffer to rthe callback for all active
- * connections of the given protocol.
+ * libwebsockets_broadcast() - Sends a buffer to the callback for all active
+ * connections of the given protocol.
* @protocol: pointer to the protocol you will broadcast to all members of
* @buf: buffer containing the data to be broadcase. NOTE: this has to be
- * allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before
- * the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the
- * case you are calling this function from callback context.
+ * allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before
+ * the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the
+ * case you are calling this function from callback context.
* @len: length of payload data in buf, starting from buf.
- *
- * This function allows bulk sending of a packet to every connection using
+ *
+ * This function allows bulk sending of a packet to every connection using
* the given protocol. It does not send the data directly; instead it calls
* the callback with a reason type of LWS_CALLBACK_BROADCAST. If the callback
* wants to actually send the data for that connection, the callback itself
int
-libwebsockets_broadcast(const struct libwebsocket_protocols * protocol,
+libwebsockets_broadcast(const struct libwebsocket_protocols *protocol,
unsigned char *buf, size_t len)
{
- struct libwebsocket_context * this = protocol->owning_server;
+ struct libwebsocket_context *context = protocol->owning_server;
int n;
+ int m;
+ struct libwebsocket * wsi;
if (!protocol->broadcast_socket_user_fd) {
/*
- * we are being called from poll thread context
+ * We are either running unforked / flat, or we are being
+ * called from poll thread context
* eg, from a callback. In that case don't use sockets for
* broadcast IPC (since we can't open a socket connection to
* a socket listening on our own thread) but directly do the
* called in the poll thread context and are serialized.
*/
- for (n = this->count_protocols + 1; n < this->fds_count; n++) {
+ for (n = 0; n < FD_HASHTABLE_MODULUS; n++) {
- if ((unsigned long)this->wsi[n] < LWS_MAX_PROTOCOLS)
- continue;
+ for (m = 0; m < context->fd_hashtable[n].length; m++) {
- /* never broadcast to non-established connection */
+ wsi = context->fd_hashtable[n].wsi[m];
- if (this->wsi[n]->state != WSI_STATE_ESTABLISHED)
- continue;
+ if (wsi->mode != LWS_CONNMODE_WS_SERVING)
+ continue;
- /* only broadcast to guys using requested protocol */
+ /*
+ * never broadcast to
+ * non-established connections
+ */
+ if (wsi->state != WSI_STATE_ESTABLISHED)
+ continue;
- if (this->wsi[n]->protocol != protocol)
- continue;
+ /* only broadcast to guys using
+ * requested protocol
+ */
+ if (wsi->protocol != protocol)
+ continue;
- this->wsi[n]->protocol-> callback(this->wsi[n],
- LWS_CALLBACK_BROADCAST,
- this->wsi[n]->user_space,
+ wsi->protocol->callback(context, wsi,
+ LWS_CALLBACK_BROADCAST,
+ wsi->user_space,
buf, len);
+ }
}
return 0;
* set up when the websocket server initializes
*/
- n = send(protocol->broadcast_socket_user_fd, buf, len, 0);
+ n = send(protocol->broadcast_socket_user_fd, buf, len, MSG_NOSIGNAL);
return n;
}
+
+int
+libwebsocket_is_final_fragment(struct libwebsocket *wsi)
+{
+ return wsi->final;
+}
+
+void *
+libwebsocket_ensure_user_space(struct libwebsocket *wsi)
+{
+ /* allocate the per-connection user memory (if any) */
+
+ if (wsi->protocol->per_session_data_size && !wsi->user_space) {
+ wsi->user_space = malloc(
+ wsi->protocol->per_session_data_size);
+ if (wsi->user_space == NULL) {
+ fprintf(stderr, "Out of memory for "
+ "conn user space\n");
+ return NULL;
+ }
+ memset(wsi->user_space, 0, wsi->protocol->per_session_data_size);
+ }
+ return wsi->user_space;
+}
projects / profile / ivi / libwebsockets.git / blobdiff