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refactor and introduce without server configure option

Browse source 
Move server-only stuff into their own files and make building
that depend on not having --without-server on the configure

Make fragments in other places conditional as well

Remove client-related members from struct libwebscket when
building LWS_NO_CLIENT

Apps:

normal: build test server, client, fraggle, ping
--without-client: build test server
--without-server: build test client, ping

Signed-off-by: Andy Green <andy.green@linaro.org>
This commit is contained in:
Andy Green 2013-01-18 11:43:21 +08:00
parent 2fd3f2f78f
commit a1ce6be947
10 changed files with 1047 additions and 909 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
README-test-server
View file

@ -77,6 +77,11 @@ There are several other possible configure options
minimize library footprint for embedded server-only
case
--without-server Don't build the server part of the library nor the
test apps that need the server part. Useful to
minimize library footprint for embedded client-only
case
--without-daemonize Don't build daemonize.c / lws_daemonize
--disable-debug Remove all debug logging below lwsl_warn in severity

15
configure.ac
View file

@ -82,6 +82,21 @@ CFLAGS="$CFLAGS -DLWS_NO_CLIENT"
fi
AM_CONDITIONAL(NO_CLIENT, test x$no_client = xyes)
#
#
#
AC_ARG_WITH(server,
[ --without-server dont build the client part of the library ],
[ no_server=yes
])
if test "x$no_server" = "xyes" ; then
CFLAGS="$CFLAGS -DLWS_NO_SERVER"
fi
AM_CONDITIONAL(NO_SERVER, test x$no_server = xyes)
#
#
#

8
lib/Makefile.am
View file

@ -1,8 +1,8 @@
lib_LTLIBRARIES=libwebsockets.la
include_HEADERS=libwebsockets.h
dist_libwebsockets_la_SOURCES=libwebsockets.c \
handshake.c \
parsers.c \
handshake.c \
libwebsockets.h \
base64-decode.c \
output.c \
@ -23,6 +23,12 @@ dist_libwebsockets_la_SOURCES+= client.c \
client-handshake.c
endif
if NO_SERVER
else
dist_libwebsockets_la_SOURCES+= server.c \
server-handshake.c
endif
if USE_BUILTIN_GETIFADDRS
dist_libwebsockets_la_SOURCES += getifaddrs.c
endif

500
lib/handshake.c
View file

@ -1,7 +1,7 @@
/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 Andy Green <andy@warmcat.com>
* Copyright (C) 2010-2013 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -21,495 +21,6 @@
#include "private-libwebsockets.h"
#define LWS_CPYAPP(ptr, str) { strcpy(ptr, str); ptr += strlen(str); }
#define LWS_CPYAPP_TOKEN(ptr, tok) { strcpy(p, wsi->utf8_token[tok].token); \
p += wsi->utf8_token[tok].token_len; }
static int
interpret_key(const char *key, unsigned long *result)
{
char digits[20];
int digit_pos = 0;
const char *p = key;
unsigned int spaces = 0;
unsigned long acc = 0;
int rem = 0;
while (*p) {
if (!isdigit(*p)) {
p++;
continue;
}
if (digit_pos == sizeof(digits) - 1)
return -1;
digits[digit_pos++] = *p++;
}
digits[digit_pos] = '\0';
if (!digit_pos)
return -2;
while (*key) {
if (*key == ' ')
spaces++;
key++;
}
if (!spaces)
return -3;
p = &digits[0];
while (*p) {
rem = (rem * 10) + ((*p++) - '0');
acc = (acc * 10) + (rem / spaces);
rem -= (rem / spaces) * spaces;
}
if (rem) {
lwsl_warn("nonzero handshake remainder\n");
return -1;
}
*result = acc;
return 0;
}
static int
handshake_00(struct libwebsocket_context *context, struct libwebsocket *wsi)
{
unsigned long key1, key2;
unsigned char sum[16];
char *response;
char *p;
int n;
/* Confirm we have all the necessary pieces */
if (!wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len ||
!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
!wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY1].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY2].token_len)
/* completed header processing, but missing some bits */
goto bail;
/* allocate the per-connection user memory (if any) */
if (wsi->protocol->per_session_data_size &&
!libwebsocket_ensure_user_space(wsi))
goto bail;
/* create the response packet */
/* make a buffer big enough for everything */
response = (char *)malloc(256 +
wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
wsi->utf8_token[WSI_TOKEN_HOST].token_len +
wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len +
wsi->utf8_token[WSI_TOKEN_GET_URI].token_len +
wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
if (!response) {
lwsl_err("Out of memory for response buffer\n");
goto bail;
}
p = response;
LWS_CPYAPP(p, "HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
"Upgrade: WebSocket\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Sec-WebSocket-Origin: ");
strcpy(p, wsi->utf8_token[WSI_TOKEN_ORIGIN].token);
p += wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len;
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->ssl) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: wss://");
} else {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: ws://");
}
#else
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: ws://");
#endif
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_HOST);
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_GET_URI);
if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Protocol: ");
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_PROTOCOL);
}
LWS_CPYAPP(p, "\x0d\x0a\x0d\x0a");
/* convert the two keys into 32-bit integers */
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY1].token, &key1))
goto bail;
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY2].token, &key2))
goto bail;
/* lay them out in network byte order (MSB first */
sum[0] = (unsigned char)(key1 >> 24);
sum[1] = (unsigned char)(key1 >> 16);
sum[2] = (unsigned char)(key1 >> 8);
sum[3] = (unsigned char)(key1);
sum[4] = (unsigned char)(key2 >> 24);
sum[5] = (unsigned char)(key2 >> 16);
sum[6] = (unsigned char)(key2 >> 8);
sum[7] = (unsigned char)(key2);
/* follow them with the challenge token we were sent */
memcpy(&sum[8], wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 8);
/*
* compute the md5sum of that 16-byte series and use as our
* payload after our headers
*/
MD5(sum, 16, (unsigned char *)p);
p += 16;
/* it's complete: go ahead and send it */
lwsl_parser("issuing response packet %d len\n", (int)(p - response));
#ifdef _DEBUG
fwrite(response, 1, p - response, stderr);
#endif
n = libwebsocket_write(wsi, (unsigned char *)response,
p - response, LWS_WRITE_HTTP);
if (n < 0) {
lwsl_debug("handshake_00: ERROR writing to socket\n");
goto bail;
}
/* alright clean up and set ourselves into established state */
free(response);
wsi->state = WSI_STATE_ESTABLISHED;
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
/* notify user code that we're ready to roll */
if (wsi->protocol->callback)
wsi->protocol->callback(wsi->protocol->owning_server,
wsi, LWS_CALLBACK_ESTABLISHED,
wsi->user_space, NULL, 0);
return 0;
bail:
return -1;
}
/*
* Perform the newer BASE64-encoded handshake scheme
*/
static int
handshake_0405(struct libwebsocket_context *context, struct libwebsocket *wsi)
{
static const char *websocket_magic_guid_04 =
"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
static const char *websocket_magic_guid_04_masking =
"61AC5F19-FBBA-4540-B96F-6561F1AB40A8";
char accept_buf[MAX_WEBSOCKET_04_KEY_LEN + 37];
char nonce_buf[256];
char mask_summing_buf[256 + MAX_WEBSOCKET_04_KEY_LEN + 37];
unsigned char hash[20];
int n;
char *response;
char *p;
char *m = mask_summing_buf;
int nonce_len = 0;
int accept_len;
char *c;
char ext_name[128];
struct libwebsocket_extension *ext;
int ext_count = 0;
int more = 1;
if (!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY].token_len) {
lwsl_parser("handshake_04 missing pieces\n");
/* completed header processing, but missing some bits */
goto bail;
}
if (wsi->utf8_token[WSI_TOKEN_KEY].token_len >=
MAX_WEBSOCKET_04_KEY_LEN) {
lwsl_warn("Client sent handshake key longer "
"than max supported %d\n", MAX_WEBSOCKET_04_KEY_LEN);
goto bail;
}
strcpy(accept_buf, wsi->utf8_token[WSI_TOKEN_KEY].token);
strcpy(accept_buf + wsi->utf8_token[WSI_TOKEN_KEY].token_len,
websocket_magic_guid_04);
SHA1((unsigned char *)accept_buf,
wsi->utf8_token[WSI_TOKEN_KEY].token_len +
strlen(websocket_magic_guid_04), hash);
accept_len = lws_b64_encode_string((char *)hash, 20, accept_buf,
sizeof accept_buf);
if (accept_len < 0) {
lwsl_warn("Base64 encoded hash too long\n");
goto bail;
}
/* allocate the per-connection user memory (if any) */
if (wsi->protocol->per_session_data_size &&
!libwebsocket_ensure_user_space(wsi))
goto bail;
/* create the response packet */
/* make a buffer big enough for everything */
response = (char *)malloc(256 +
wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
if (!response) {
lwsl_err("Out of memory for response buffer\n");
goto bail;
}
p = response;
LWS_CPYAPP(p, "HTTP/1.1 101 Switching Protocols\x0d\x0a"
"Upgrade: WebSocket\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Sec-WebSocket-Accept: ");
strcpy(p, accept_buf);
p += accept_len;
if (wsi->ietf_spec_revision == 4) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Nonce: ");
/* select the nonce */
n = libwebsockets_get_random(wsi->protocol->owning_server,
hash, 16);
if (n != 16) {
lwsl_err("Unable to read random device %s %d\n",
SYSTEM_RANDOM_FILEPATH, n);
if (wsi->user_space)
free(wsi->user_space);
goto bail;
}
/* encode the nonce */
nonce_len = lws_b64_encode_string((const char *)hash, 16,
nonce_buf, sizeof nonce_buf);
if (nonce_len < 0) {
lwsl_err("Failed to base 64 encode the nonce\n");
if (wsi->user_space)
free(wsi->user_space);
goto bail;
}
/* apply the nonce */
strcpy(p, nonce_buf);
p += nonce_len;
}
if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Protocol: ");
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_PROTOCOL);
}
/*
* Figure out which extensions the client has that we want to
* enable on this connection, and give him back the list
*/
if (wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token_len) {
/*
* break down the list of client extensions
* and go through them
*/
c = wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token;
lwsl_parser("wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token = %s\n",
wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token);
wsi->count_active_extensions = 0;
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 a client's extension against our support */
ext = wsi->protocol->owning_server->extensions;
while (ext && ext->callback) {
if (strcmp(ext_name, ext->name)) {
ext++;
continue;
}
/*
* oh, we do support this one he
* asked for... but let's ask user
* code if it's OK to apply it on this
* particular connection + protocol
*/
n = wsi->protocol->owning_server->
protocols[0].callback(
wsi->protocol->owning_server,
wsi,
LWS_CALLBACK_CONFIRM_EXTENSION_OKAY,
wsi->user_space, 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++ = ',';
else
LWS_CPYAPP(p,
"\x0d\x0aSec-WebSocket-Extensions: ");
p += sprintf(p, "%s", ext_name);
ext_count++;
/* instantiate the extension on this conn */
wsi->active_extensions_user[
wsi->count_active_extensions] =
malloc(ext->per_session_data_size);
if (wsi->active_extensions_user[
wsi->count_active_extensions] == NULL) {
lwsl_err("Out of mem\n");
free(response);
goto bail;
}
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_CONSTRUCT,
wsi->active_extensions_user[
wsi->count_active_extensions], NULL, 0);
wsi->count_active_extensions++;
lwsl_parser("wsi->count_active_extensions <- %d\n",
wsi->count_active_extensions);
ext++;
}
n = 0;
}
}
/* end of response packet */
LWS_CPYAPP(p, "\x0d\x0a\x0d\x0a");
if (wsi->ietf_spec_revision == 4) {
/*
* precompute the masking key the client will use from the SHA1
* hash of ( base 64 client key we were sent, concatenated with
* the bse 64 nonce we sent, concatenated with a magic constant
* guid specified by the 04 standard )
*
* We store the hash in the connection's wsi ready to use with
* undoing the masking the client has done on framed data it
* sends (we send our data to the client in clear).
*/
strcpy(mask_summing_buf, wsi->utf8_token[WSI_TOKEN_KEY].token);
m += wsi->utf8_token[WSI_TOKEN_KEY].token_len;
strcpy(m, nonce_buf);
m += nonce_len;
strcpy(m, websocket_magic_guid_04_masking);
m += strlen(websocket_magic_guid_04_masking);
SHA1((unsigned char *)mask_summing_buf, m - mask_summing_buf,
wsi->masking_key_04);
}
if (!lws_any_extension_handled(context, wsi,
LWS_EXT_CALLBACK_HANDSHAKE_REPLY_TX,
response, p - response)) {
/* okay send the handshake response accepting the connection */
lwsl_parser("issuing response packet %d len\n", (int)(p - response));
#ifdef DEBUG
fwrite(response, 1, p - response, stderr);
#endif
n = libwebsocket_write(wsi, (unsigned char *)response,
p - response, LWS_WRITE_HTTP);
if (n < 0) {
lwsl_debug("handshake_0405: ERROR writing to socket\n");
goto bail;
}
}
/* alright clean up and set ourselves into established state */
free(response);
wsi->state = WSI_STATE_ESTABLISHED;
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
wsi->rx_packet_length = 0;
/* notify user code that we're ready to roll */
if (wsi->protocol->callback)
wsi->protocol->callback(wsi->protocol->owning_server,
wsi, LWS_CALLBACK_ESTABLISHED,
wsi->user_space, NULL, 0);
return 0;
bail:
return -1;
}
/*
* -04 of the protocol (actually the 80th version) has a radically different
* handshake. The 04 spec gives the following idea
@ -580,8 +91,12 @@ libwebsocket_read(struct libwebsocket_context *context,
break;
}
#endif
#ifndef LWS_NO_SERVER
/* LWS_CONNMODE_WS_SERVING */
extern int handshake_00(struct libwebsocket_context *context, struct libwebsocket *wsi);
extern int handshake_0405(struct libwebsocket_context *context, struct libwebsocket *wsi);
for (n = 0; n < len; n++)
libwebsocket_parse(wsi, *buf++);
@ -702,7 +217,7 @@ libwebsocket_read(struct libwebsocket_context *context,
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
#endif
break;
case WSI_STATE_AWAITING_CLOSE_ACK:
@ -719,11 +234,12 @@ libwebsocket_read(struct libwebsocket_context *context,
break;
}
#endif
#ifndef LWS_NO_SERVER
/* LWS_CONNMODE_WS_SERVING */
if (libwebsocket_interpret_incoming_packet(wsi, buf, len) < 0)
goto bail;
#endif
break;
default:
lwsl_err("libwebsocket_read: Unhandled state\n");

414
lib/libwebsockets.c
View file

@ -128,49 +128,6 @@ do_ext:
return 0;
}
#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));
lwsl_err("*** %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_context *context,
@ -367,10 +324,10 @@ just_kill_connection:
for (n = 0; n < WSI_TOKEN_COUNT; n++)
if (wsi->utf8_token[n].token)
free(wsi->utf8_token[n].token);
#ifndef LWS_NO_CLIENT
if (wsi->c_address)
free(wsi->c_address);
#endif
if (wsi->rxflow_buffer)
free(wsi->rxflow_buffer);
@ -703,54 +660,6 @@ libwebsocket_service_timeout_check(struct libwebsocket_context *context,
}
}
struct libwebsocket *
libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
{
struct libwebsocket *new_wsi;
int n;
new_wsi = (struct libwebsocket *)malloc(sizeof(struct libwebsocket));
if (new_wsi == NULL) {
lwsl_err("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_HTTP_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;
}
/**
* libwebsocket_service_fd() - Service polled socket with something waiting
* @context: Websocket context
@ -766,22 +675,19 @@ int
libwebsocket_service_fd(struct libwebsocket_context *context,
struct pollfd *pollfd)
{
struct libwebsocket *wsi;
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;
int more = 1;
struct lws_tokens eff_buf;
int opt = 1;
#ifndef LWS_NO_CLIENT
extern int lws_client_socket_service(struct libwebsocket_context *context, struct libwebsocket *wsi, struct pollfd *pollfd);
#endif
#ifndef LWS_NO_SERVER
extern int lws_server_socket_service(struct libwebsocket_context *context, struct libwebsocket *wsi, struct pollfd *pollfd);
#endif
/*
* you can call us with pollfd = NULL to just allow the once-per-second
@ -856,278 +762,13 @@ libwebsocket_service_fd(struct libwebsocket_context *context,
switch (wsi->mode) {
#ifndef LWS_NO_SERVER
case LWS_CONNMODE_HTTP_SERVING:
/* handle http headers coming in */
/* any incoming data ready? */
if (pollfd->revents & POLLIN) {
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->ssl)
len = SSL_read(wsi->ssl, buf, sizeof buf);
else
#endif
len = recv(pollfd->fd, buf, sizeof buf, 0);
if (len < 0) {
lwsl_debug("Socket read returned %d\n", len);
if (errno != EINTR && errno != EAGAIN)
libwebsocket_close_and_free_session(context,
wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
if (!len) {
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
n = libwebsocket_read(context, wsi, buf, len);
if (n < 0)
/* we closed wsi */
return 0;
}
/* this handles POLLOUT for http serving fragments */
if (!(pollfd->revents & POLLOUT))
break;
/* one shot */
pollfd->events &= ~POLLOUT;
if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE)
break;
if (libwebsockets_serve_http_file_fragment(context, wsi) < 0)
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NOSTATUS);
else
if (wsi->state == WSI_STATE_HTTP && wsi->protocol->callback)
if (user_callback_handle_rxflow(wsi->protocol->callback, context, wsi, LWS_CALLBACK_HTTP_FILE_COMPLETION, wsi->user_space,
wsi->filepath, wsi->filepos))
libwebsocket_close_and_free_session(context, wsi, LWS_CLOSE_STATUS_NOSTATUS);
break;
case LWS_CONNMODE_SERVER_LISTENER:
/* pollin means a client has connected to us then */
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) {
lwsl_warn("ERROR on accept: %s\n", strerror(errno));
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)) {
lwsl_debug("Callback denied network connection\n");
compatible_close(accept_fd);
break;
}
new_wsi = libwebsocket_create_new_server_wsi(context);
if (new_wsi == NULL) {
compatible_close(accept_fd);
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) {
lwsl_err("SSL_new failed: %s\n",
ERR_error_string(SSL_get_error(
new_wsi->ssl, 0), NULL));
libwebsockets_decode_ssl_error();
free(new_wsi);
compatible_close(accept_fd);
break;
}
SSL_set_ex_data(new_wsi->ssl,
openssl_websocket_private_data_index, context);
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
*/
lwsl_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);
compatible_close(accept_fd);
break;
}
lwsl_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
lwsl_debug("accepted new conn port %u on fd=%d\n",
ntohs(cli_addr.sin_port), accept_fd);
insert_wsi_socket_into_fds(context, new_wsi);
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) {
lwsl_warn("ERROR on accept %d\n", accept_fd);
return 0;
}
/* create a dummy wsi for the connection and add it */
new_wsi = (struct libwebsocket *)malloc(sizeof(struct libwebsocket));
if (new_wsi == NULL) {
lwsl_err("Out of mem\n");
goto bail_prox_listener;
}
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_socket_into_fds(context, new_wsi);
break;
bail_prox_listener:
compatible_close(accept_fd);
break;
case LWS_CONNMODE_BROADCAST_PROXY:
/* handle session socket closed */
if (pollfd->revents & (POLLERR | POLLHUP)) {
lwsl_debug("Session Socket %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NORMAL);
return 0;
}
/*
* 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 0;
}
/* 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) {
lwsl_err("Error reading broadcast payload\n");
break;
}
/* broadcast it to all guys with this protocol index */
for (n = 0; n < context->fds_count; n++) {
new_wsi = context->lws_lookup[context->fds[n].fd];
if (new_wsi == NULL)
continue;
/* 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 */
user_callback_handle_rxflow(new_wsi->protocol->callback, context, new_wsi,
LWS_CALLBACK_BROADCAST,
new_wsi->user_space,
buf + LWS_SEND_BUFFER_PRE_PADDING, len);
}
break;
return lws_server_socket_service(context, wsi, pollfd);
#endif
case LWS_CONNMODE_WS_SERVING:
case LWS_CONNMODE_WS_CLIENT:
@ -1535,7 +1176,13 @@ libwebsocket_get_socket_fd(struct libwebsocket *wsi)
return wsi->sock;
}
#ifdef LWS_NO_SERVER
int
_libwebsocket_rx_flow_control(struct libwebsocket *wsi)
{
return 0;
}
#else
int
_libwebsocket_rx_flow_control(struct libwebsocket *wsi)
{
@ -1579,6 +1226,7 @@ _libwebsocket_rx_flow_control(struct libwebsocket *wsi)
return 1;
}
#endif
/**
* libwebsocket_rx_flow_control() - Enable and disable socket servicing for
@ -1736,17 +1384,13 @@ libwebsocket_create_context(int port, const char *interf,
{
int n;
int m;
int sockfd = 0;
int fd;
struct sockaddr_in serv_addr, cli_addr;
int opt = 1;
struct libwebsocket_context *context = NULL;
unsigned int slen;
char *p;
char hostname[1024] = "";
// struct hostent *he;
struct libwebsocket *wsi;
struct sockaddr sa;
#ifdef LWS_OPENSSL_SUPPORT
SSL_METHOD *method;
@ -1848,11 +1492,12 @@ libwebsocket_create_context(int port, const char *interf,
openssl_websocket_private_data_index = 0;
#endif
if (options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME) {
strcpy(context->canonical_hostname, "unknown");
strcpy(context->canonical_hostname, "unknown");
} else {
#ifndef LWS_NO_SERVER
if (!(options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)) {
struct sockaddr sa;
char hostname[1024] = "";
/* find canonical hostname */
@ -1880,9 +1525,9 @@ libwebsocket_create_context(int port, const char *interf,
strncpy(context->canonical_hostname, hostname,
sizeof context->canonical_hostname - 1);
// lwsl_debug("context->canonical_hostname = %s\n",
// context->canonical_hostname);
lwsl_info(" canonical_hostname = %s\n", context->canonical_hostname);
}
#endif
/* split the proxy ads:port if given */
@ -1901,11 +1546,12 @@ libwebsocket_create_context(int port, const char *interf,
*p = '\0';
context->http_proxy_port = atoi(p + 1);
lwsl_debug("Using proxy %s:%u\n",
lwsl_info(" Proxy %s:%u\n",
context->http_proxy_address,
context->http_proxy_port);
}
#ifndef LWS_NO_SERVER
if (port) {
#ifdef LWS_OPENSSL_SUPPORT
@ -1926,6 +1572,7 @@ libwebsocket_create_context(int port, const char *interf,
"serving unencrypted\n");
#endif
}
#endif
/* ignore SIGPIPE */
#ifdef WIN32
@ -1970,6 +1617,8 @@ libwebsocket_create_context(int port, const char *interf,
SSL_CTX_set_options(context->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
SSL_CTX_set_cipher_list(context->ssl_ctx, CIPHERS_LIST_STRING);
#ifndef LWS_NO_CLIENT
/* client context */
if (port == CONTEXT_PORT_NO_LISTEN) {
@ -2021,6 +1670,7 @@ libwebsocket_create_context(int port, const char *interf,
LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS,
context->ssl_client_ctx, NULL, 0);
}
#endif
/* as a server, are we requiring clients to identify themselves? */
@ -2078,9 +1728,12 @@ libwebsocket_create_context(int port, const char *interf,
if (lws_b64_selftest())
return NULL;
#ifndef LWS_NO_SERVER
/* set up our external listening socket we serve on */
if (port) {
extern int interface_to_sa(const char *ifname, struct sockaddr_in *addr, size_t addrlen);
int sockfd;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
@ -2135,6 +1788,7 @@ libwebsocket_create_context(int port, const char *interf,
listen(sockfd, LWS_SOMAXCONN);
lwsl_info(" Listening on port %d\n", port);
}
#endif
/*
* drop any root privs for this process

32
lib/parsers.c
View file

@ -1,7 +1,7 @@
/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 Andy Green <andy@warmcat.com>
* Copyright (C) 2010-2013 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -25,33 +25,6 @@
#include <io.h>
#endif
static const struct lws_tokens lws_tokens[WSI_TOKEN_COUNT] = {
/* win32 can't do C99 */
/* [WSI_TOKEN_GET_URI] = */{ "GET ", 4 },
/* [WSI_TOKEN_HOST] = */{ "Host:", 5 },
/* [WSI_TOKEN_CONNECTION] = */{ "Connection:", 11 },
/* [WSI_TOKEN_KEY1] = */{ "Sec-WebSocket-Key1:", 19 },
/* [WSI_TOKEN_KEY2] = */{ "Sec-WebSocket-Key2:", 19 },
/* [WSI_TOKEN_PROTOCOL] = */{ "Sec-WebSocket-Protocol:", 23 },
/* [WSI_TOKEN_UPGRADE] = */{ "Upgrade:", 8 },
/* [WSI_TOKEN_ORIGIN] = */{ "Origin:", 7 },
/* [WSI_TOKEN_DRAFT] = */{ "Sec-WebSocket-Draft:", 20 },
/* [WSI_TOKEN_CHALLENGE] = */{ "\x0d\x0a", 2 },
/* [WSI_TOKEN_KEY] = */{ "Sec-WebSocket-Key:", 18 },
/* [WSI_TOKEN_VERSION] = */{ "Sec-WebSocket-Version:", 22 },
/* [WSI_TOKEN_SWORIGIN]= */{ "Sec-WebSocket-Origin:", 21 },
/* [WSI_TOKEN_EXTENSIONS] = */{ "Sec-WebSocket-Extensions:", 25 },
/* [WSI_TOKEN_ACCEPT] = */{ "Sec-WebSocket-Accept:", 21 },
/* [WSI_TOKEN_NONCE] = */{ "Sec-WebSocket-Nonce:", 20 },
/* [WSI_TOKEN_HTTP] = */{ "HTTP/1.1 ", 9 },
/* [WSI_TOKEN_MUXURL] = */{ "", -1 },
};
unsigned char lextable[] = {
/* pos 0: state 0 */
@ -626,7 +599,6 @@ int lws_frame_is_binary(struct libwebsocket *wsi)
return wsi->frame_is_binary;
}
int
libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c)
{
@ -1191,8 +1163,6 @@ illegal_ctl_length:
}
int libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
unsigned char *buf, size_t len)
{

6
lib/private-libwebsockets.h
View file

@ -378,9 +378,11 @@ struct libwebsocket {
/* 07 specific */
char this_frame_masked;
enum connection_mode mode;
#ifndef LWS_NO_CLIENT
/* client support */
char initial_handshake_hash_base64[30];
enum connection_mode mode;
char *c_path;
char *c_host;
char *c_origin;
@ -389,7 +391,7 @@ struct libwebsocket {
char *c_address;
int c_port;
#endif
#ifdef LWS_OPENSSL_SUPPORT
SSL *ssl;

510
lib/server-handshake.c Normal file
View file

@ -0,0 +1,510 @@
/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2013 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
#define LWS_CPYAPP(ptr, str) { strcpy(ptr, str); ptr += strlen(str); }
#define LWS_CPYAPP_TOKEN(ptr, tok) { strcpy(p, wsi->utf8_token[tok].token); \
p += wsi->utf8_token[tok].token_len; }
static int
interpret_key(const char *key, unsigned long *result)
{
char digits[20];
int digit_pos = 0;
const char *p = key;
unsigned int spaces = 0;
unsigned long acc = 0;
int rem = 0;
while (*p) {
if (!isdigit(*p)) {
p++;
continue;
}
if (digit_pos == sizeof(digits) - 1)
return -1;
digits[digit_pos++] = *p++;
}
digits[digit_pos] = '\0';
if (!digit_pos)
return -2;
while (*key) {
if (*key == ' ')
spaces++;
key++;
}
if (!spaces)
return -3;
p = &digits[0];
while (*p) {
rem = (rem * 10) + ((*p++) - '0');
acc = (acc * 10) + (rem / spaces);
rem -= (rem / spaces) * spaces;
}
if (rem) {
lwsl_warn("nonzero handshake remainder\n");
return -1;
}
*result = acc;
return 0;
}
int handshake_00(struct libwebsocket_context *context, struct libwebsocket *wsi)
{
unsigned long key1, key2;
unsigned char sum[16];
char *response;
char *p;
int n;
/* Confirm we have all the necessary pieces */
if (!wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len ||
!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
!wsi->utf8_token[WSI_TOKEN_CHALLENGE].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY1].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY2].token_len)
/* completed header processing, but missing some bits */
goto bail;
/* allocate the per-connection user memory (if any) */
if (wsi->protocol->per_session_data_size &&
!libwebsocket_ensure_user_space(wsi))
goto bail;
/* create the response packet */
/* make a buffer big enough for everything */
response = (char *)malloc(256 +
wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
wsi->utf8_token[WSI_TOKEN_HOST].token_len +
wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len +
wsi->utf8_token[WSI_TOKEN_GET_URI].token_len +
wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
if (!response) {
lwsl_err("Out of memory for response buffer\n");
goto bail;
}
p = response;
LWS_CPYAPP(p, "HTTP/1.1 101 WebSocket Protocol Handshake\x0d\x0a"
"Upgrade: WebSocket\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Sec-WebSocket-Origin: ");
strcpy(p, wsi->utf8_token[WSI_TOKEN_ORIGIN].token);
p += wsi->utf8_token[WSI_TOKEN_ORIGIN].token_len;
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->ssl) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: wss://");
} else {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: ws://");
}
#else
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Location: ws://");
#endif
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_HOST);
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_GET_URI);
if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Protocol: ");
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_PROTOCOL);
}
LWS_CPYAPP(p, "\x0d\x0a\x0d\x0a");
/* convert the two keys into 32-bit integers */
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY1].token, &key1))
goto bail;
if (interpret_key(wsi->utf8_token[WSI_TOKEN_KEY2].token, &key2))
goto bail;
/* lay them out in network byte order (MSB first */
sum[0] = (unsigned char)(key1 >> 24);
sum[1] = (unsigned char)(key1 >> 16);
sum[2] = (unsigned char)(key1 >> 8);
sum[3] = (unsigned char)(key1);
sum[4] = (unsigned char)(key2 >> 24);
sum[5] = (unsigned char)(key2 >> 16);
sum[6] = (unsigned char)(key2 >> 8);
sum[7] = (unsigned char)(key2);
/* follow them with the challenge token we were sent */
memcpy(&sum[8], wsi->utf8_token[WSI_TOKEN_CHALLENGE].token, 8);
/*
* compute the md5sum of that 16-byte series and use as our
* payload after our headers
*/
MD5(sum, 16, (unsigned char *)p);
p += 16;
/* it's complete: go ahead and send it */
lwsl_parser("issuing response packet %d len\n", (int)(p - response));
#ifdef _DEBUG
fwrite(response, 1, p - response, stderr);
#endif
n = libwebsocket_write(wsi, (unsigned char *)response,
p - response, LWS_WRITE_HTTP);
if (n < 0) {
lwsl_debug("handshake_00: ERROR writing to socket\n");
goto bail;
}
/* alright clean up and set ourselves into established state */
free(response);
wsi->state = WSI_STATE_ESTABLISHED;
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
/* notify user code that we're ready to roll */
if (wsi->protocol->callback)
wsi->protocol->callback(wsi->protocol->owning_server,
wsi, LWS_CALLBACK_ESTABLISHED,
wsi->user_space, NULL, 0);
return 0;
bail:
return -1;
}
/*
* Perform the newer BASE64-encoded handshake scheme
*/
int
handshake_0405(struct libwebsocket_context *context, struct libwebsocket *wsi)
{
static const char *websocket_magic_guid_04 =
"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
static const char *websocket_magic_guid_04_masking =
"61AC5F19-FBBA-4540-B96F-6561F1AB40A8";
char accept_buf[MAX_WEBSOCKET_04_KEY_LEN + 37];
char nonce_buf[256];
char mask_summing_buf[256 + MAX_WEBSOCKET_04_KEY_LEN + 37];
unsigned char hash[20];
int n;
char *response;
char *p;
char *m = mask_summing_buf;
int nonce_len = 0;
int accept_len;
char *c;
char ext_name[128];
struct libwebsocket_extension *ext;
int ext_count = 0;
int more = 1;
if (!wsi->utf8_token[WSI_TOKEN_HOST].token_len ||
!wsi->utf8_token[WSI_TOKEN_KEY].token_len) {
lwsl_parser("handshake_04 missing pieces\n");
/* completed header processing, but missing some bits */
goto bail;
}
if (wsi->utf8_token[WSI_TOKEN_KEY].token_len >=
MAX_WEBSOCKET_04_KEY_LEN) {
lwsl_warn("Client sent handshake key longer "
"than max supported %d\n", MAX_WEBSOCKET_04_KEY_LEN);
goto bail;
}
strcpy(accept_buf, wsi->utf8_token[WSI_TOKEN_KEY].token);
strcpy(accept_buf + wsi->utf8_token[WSI_TOKEN_KEY].token_len,
websocket_magic_guid_04);
SHA1((unsigned char *)accept_buf,
wsi->utf8_token[WSI_TOKEN_KEY].token_len +
strlen(websocket_magic_guid_04), hash);
accept_len = lws_b64_encode_string((char *)hash, 20, accept_buf,
sizeof accept_buf);
if (accept_len < 0) {
lwsl_warn("Base64 encoded hash too long\n");
goto bail;
}
/* allocate the per-connection user memory (if any) */
if (wsi->protocol->per_session_data_size &&
!libwebsocket_ensure_user_space(wsi))
goto bail;
/* create the response packet */
/* make a buffer big enough for everything */
response = (char *)malloc(256 +
wsi->utf8_token[WSI_TOKEN_UPGRADE].token_len +
wsi->utf8_token[WSI_TOKEN_CONNECTION].token_len +
wsi->utf8_token[WSI_TOKEN_PROTOCOL].token_len);
if (!response) {
lwsl_err("Out of memory for response buffer\n");
goto bail;
}
p = response;
LWS_CPYAPP(p, "HTTP/1.1 101 Switching Protocols\x0d\x0a"
"Upgrade: WebSocket\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Sec-WebSocket-Accept: ");
strcpy(p, accept_buf);
p += accept_len;
if (wsi->ietf_spec_revision == 4) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Nonce: ");
/* select the nonce */
n = libwebsockets_get_random(wsi->protocol->owning_server,
hash, 16);
if (n != 16) {
lwsl_err("Unable to read random device %s %d\n",
SYSTEM_RANDOM_FILEPATH, n);
if (wsi->user_space)
free(wsi->user_space);
goto bail;
}
/* encode the nonce */
nonce_len = lws_b64_encode_string((const char *)hash, 16,
nonce_buf, sizeof nonce_buf);
if (nonce_len < 0) {
lwsl_err("Failed to base 64 encode the nonce\n");
if (wsi->user_space)
free(wsi->user_space);
goto bail;
}
/* apply the nonce */
strcpy(p, nonce_buf);
p += nonce_len;
}
if (wsi->utf8_token[WSI_TOKEN_PROTOCOL].token) {
LWS_CPYAPP(p, "\x0d\x0aSec-WebSocket-Protocol: ");
LWS_CPYAPP_TOKEN(p, WSI_TOKEN_PROTOCOL);
}
/*
* Figure out which extensions the client has that we want to
* enable on this connection, and give him back the list
*/
if (wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token_len) {
/*
* break down the list of client extensions
* and go through them
*/
c = wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token;
lwsl_parser("wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token = %s\n",
wsi->utf8_token[WSI_TOKEN_EXTENSIONS].token);
wsi->count_active_extensions = 0;
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 a client's extension against our support */
ext = wsi->protocol->owning_server->extensions;
while (ext && ext->callback) {
if (strcmp(ext_name, ext->name)) {
ext++;
continue;
}
/*
* oh, we do support this one he
* asked for... but let's ask user
* code if it's OK to apply it on this
* particular connection + protocol
*/
n = wsi->protocol->owning_server->
protocols[0].callback(
wsi->protocol->owning_server,
wsi,
LWS_CALLBACK_CONFIRM_EXTENSION_OKAY,
wsi->user_space, 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++ = ',';
else
LWS_CPYAPP(p,
"\x0d\x0aSec-WebSocket-Extensions: ");
p += sprintf(p, "%s", ext_name);
ext_count++;
/* instantiate the extension on this conn */
wsi->active_extensions_user[
wsi->count_active_extensions] =
malloc(ext->per_session_data_size);
if (wsi->active_extensions_user[
wsi->count_active_extensions] == NULL) {
lwsl_err("Out of mem\n");
free(response);
goto bail;
}
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_CONSTRUCT,
wsi->active_extensions_user[
wsi->count_active_extensions], NULL, 0);
wsi->count_active_extensions++;
lwsl_parser("wsi->count_active_extensions <- %d\n",
wsi->count_active_extensions);
ext++;
}
n = 0;
}
}
/* end of response packet */
LWS_CPYAPP(p, "\x0d\x0a\x0d\x0a");
if (wsi->ietf_spec_revision == 4) {
/*
* precompute the masking key the client will use from the SHA1
* hash of ( base 64 client key we were sent, concatenated with
* the bse 64 nonce we sent, concatenated with a magic constant
* guid specified by the 04 standard )
*
* We store the hash in the connection's wsi ready to use with
* undoing the masking the client has done on framed data it
* sends (we send our data to the client in clear).
*/
strcpy(mask_summing_buf, wsi->utf8_token[WSI_TOKEN_KEY].token);
m += wsi->utf8_token[WSI_TOKEN_KEY].token_len;
strcpy(m, nonce_buf);
m += nonce_len;
strcpy(m, websocket_magic_guid_04_masking);
m += strlen(websocket_magic_guid_04_masking);
SHA1((unsigned char *)mask_summing_buf, m - mask_summing_buf,
wsi->masking_key_04);
}
if (!lws_any_extension_handled(context, wsi,
LWS_EXT_CALLBACK_HANDSHAKE_REPLY_TX,
response, p - response)) {
/* okay send the handshake response accepting the connection */
lwsl_parser("issuing response packet %d len\n", (int)(p - response));
#ifdef DEBUG
fwrite(response, 1, p - response, stderr);
#endif
n = libwebsocket_write(wsi, (unsigned char *)response,
p - response, LWS_WRITE_HTTP);
if (n < 0) {
lwsl_debug("handshake_0405: ERROR writing to socket\n");
goto bail;
}
}
/* alright clean up and set ourselves into established state */
free(response);
wsi->state = WSI_STATE_ESTABLISHED;
wsi->lws_rx_parse_state = LWS_RXPS_NEW;
wsi->rx_packet_length = 0;
/* notify user code that we're ready to roll */
if (wsi->protocol->callback)
wsi->protocol->callback(wsi->protocol->owning_server,
wsi, LWS_CALLBACK_ESTABLISHED,
wsi->user_space, NULL, 0);
return 0;
bail:
return -1;
}

421
lib/server.c Normal file
View file

@ -0,0 +1,421 @@
/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2013 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
#ifdef WIN32
#include <tchar.h>
#include <io.h>
#else
#ifdef LWS_BUILTIN_GETIFADDRS
#include <getifaddrs.h>
#else
#include <ifaddrs.h>
#endif
#include <sys/un.h>
#include <sys/socket.h>
#include <netdb.h>
#endif
#ifdef LWS_OPENSSL_SUPPORT
extern int openssl_websocket_private_data_index;
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));
lwsl_err("*** %s\n", buf);
}
}
#endif
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;
}
struct libwebsocket *
libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
{
struct libwebsocket *new_wsi;
int n;
new_wsi = (struct libwebsocket *)malloc(sizeof(struct libwebsocket));
if (new_wsi == NULL) {
lwsl_err("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_HTTP_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;
}
int lws_server_socket_service(struct libwebsocket_context *context,
struct libwebsocket *wsi, struct pollfd *pollfd)
{
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1 +
MAX_BROADCAST_PAYLOAD + LWS_SEND_BUFFER_POST_PADDING];
struct libwebsocket *new_wsi;
int accept_fd;
unsigned int clilen;
struct sockaddr_in cli_addr;
int n;
int opt = 1;
ssize_t len;
switch (wsi->mode) {
case LWS_CONNMODE_HTTP_SERVING:
/* handle http headers coming in */
/* any incoming data ready? */
if (pollfd->revents & POLLIN) {
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->ssl)
len = SSL_read(wsi->ssl, buf, sizeof buf);
else
#endif
len = recv(pollfd->fd, buf, sizeof buf, 0);
if (len < 0) {
lwsl_debug("Socket read returned %d\n", len);
if (errno != EINTR && errno != EAGAIN)
libwebsocket_close_and_free_session(context,
wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
if (!len) {
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
n = libwebsocket_read(context, wsi, buf, len);
if (n < 0)
/* we closed wsi */
return 0;
}
/* this handles POLLOUT for http serving fragments */
if (!(pollfd->revents & POLLOUT))
break;
/* one shot */
pollfd->events &= ~POLLOUT;
if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE)
break;
if (libwebsockets_serve_http_file_fragment(context, wsi) < 0)
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NOSTATUS);
else
if (wsi->state == WSI_STATE_HTTP && wsi->protocol->callback)
if (user_callback_handle_rxflow(wsi->protocol->callback, context, wsi, LWS_CALLBACK_HTTP_FILE_COMPLETION, wsi->user_space,
wsi->filepath, wsi->filepos))
libwebsocket_close_and_free_session(context, wsi, LWS_CLOSE_STATUS_NOSTATUS);
break;
case LWS_CONNMODE_SERVER_LISTENER:
/* pollin means a client has connected to us then */
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) {
lwsl_warn("ERROR on accept: %s\n", strerror(errno));
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)) {
lwsl_debug("Callback denied network connection\n");
compatible_close(accept_fd);
break;
}
new_wsi = libwebsocket_create_new_server_wsi(context);
if (new_wsi == NULL) {
compatible_close(accept_fd);
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) {
lwsl_err("SSL_new failed: %s\n",
ERR_error_string(SSL_get_error(
new_wsi->ssl, 0), NULL));
libwebsockets_decode_ssl_error();
free(new_wsi);
compatible_close(accept_fd);
break;
}
SSL_set_ex_data(new_wsi->ssl,
openssl_websocket_private_data_index, context);
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
*/
lwsl_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);
compatible_close(accept_fd);
break;
}
lwsl_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
lwsl_debug("accepted new conn port %u on fd=%d\n",
ntohs(cli_addr.sin_port), accept_fd);
insert_wsi_socket_into_fds(context, new_wsi);
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) {
lwsl_warn("ERROR on accept %d\n", accept_fd);
return 0;
}
/* create a dummy wsi for the connection and add it */
new_wsi = (struct libwebsocket *)malloc(sizeof(struct libwebsocket));
if (new_wsi == NULL) {
lwsl_err("Out of mem\n");
goto bail_prox_listener;
}
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_socket_into_fds(context, new_wsi);
break;
bail_prox_listener:
compatible_close(accept_fd);
break;
case LWS_CONNMODE_BROADCAST_PROXY:
/* handle session socket closed */
if (pollfd->revents & (POLLERR | POLLHUP)) {
lwsl_debug("Session Socket %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
libwebsocket_close_and_free_session(context, wsi,
LWS_CLOSE_STATUS_NORMAL);
return 0;
}
/*
* 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 0;
}
/* 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) {
lwsl_err("Error reading broadcast payload\n");
break;
}
/* broadcast it to all guys with this protocol index */
for (n = 0; n < context->fds_count; n++) {
new_wsi = context->lws_lookup[context->fds[n].fd];
if (new_wsi == NULL)
continue;
/* 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 */
user_callback_handle_rxflow(new_wsi->protocol->callback, context, new_wsi,
LWS_CALLBACK_BROADCAST,
new_wsi->user_space,
buf + LWS_SEND_BUFFER_PRE_PADDING, len);
}
break;
default:
break;
}
return 0;
}

45
test-server/Makefile.am
View file

@ -1,60 +1,99 @@
bin_PROGRAMS=libwebsockets-test-server libwebsockets-test-server-extpoll
bin_PROGRAMS=
if NO_CLIENT
else
bin_PROGRAMS+=libwebsockets-test-client libwebsockets-test-fraggle
bin_PROGRAMS+= libwebsockets-test-client
if NO_SERVER
else
bin_PROGRAMS+= libwebsockets-test-fraggle
endif
endif
if NO_SERVER
else
bin_PROGRAMS+=libwebsockets-test-server libwebsockets-test-server-extpoll
endif
if NO_SERVER
else
libwebsockets_test_server_SOURCES=test-server.c
libwebsockets_test_server_CFLAGS=
libwebsockets_test_server_LDADD=-L../lib -lwebsockets -lz
libwebsockets_test_server_extpoll_SOURCES=test-server.c
libwebsockets_test_server_extpoll_CFLAGS=$(AM_CFLAGS) -DEXTERNAL_POLL
libwebsockets_test_server_extpoll_LDADD=-L../lib -lwebsockets -lz
endif
if NO_CLIENT
else
libwebsockets_test_client_SOURCES=test-client.c
libwebsockets_test_client_CFLAGS=
libwebsockets_test_client_LDADD=-L../lib -lwebsockets -lz
if NO_SERVER
else
libwebsockets_test_fraggle_SOURCES=test-fraggle.c
libwebsockets_test_fraggle_CFLAGS=
libwebsockets_test_fraggle_LDADD=-L../lib -lwebsockets -lz
endif
endif
if MINGW
if MINGW
if NO_SERVER
else
libwebsockets_test_server_CFLAGS+= -w -I../win32port/win32helpers
libwebsockets_test_server_extpoll_CFLAGS+= -w -I../win32port/win32helpers
endif
if NO_CLIENT
else
libwebsockets_test_client_CFLAGS+= -w -I../win32port/win32helpers
if NO_SERVER
else
libwebsockets_test_fraggle_CFLAGS+= -w -I../win32port/win32helpers
endif
endif
if NO_SERVER
else
libwebsockets_test_server_LDADD+= -lm -luser32 -ladvapi32 -lkernel32 -lgcc -lws2_32 -lz
libwebsockets_test_server_extpoll_LDADD+= -lm -luser32 -ladvapi32 -lkernel32 -lgcc -lws2_32 -lz
endif
if NO_CLIENT
else
libwebsockets_test_client_LDADD+= -lm -luser32 -ladvapi32 -lkernel32 -lgcc -lws2_32 -lz
if NO_SERVER
else
libwebsockets_test_fraggle_LDADD+= -lm -luser32 -ladvapi32 -lkernel32 -lgcc -lws2_32 -lz
endif
endif
else
if NO_SERVER
else
libwebsockets_test_server_CFLAGS+= -Werror
libwebsockets_test_server_extpoll_CFLAGS+= -Werror
endif
if NO_CLIENT
else
libwebsockets_test_client_CFLAGS+= -Werror
if NO_SERVER
else
libwebsockets_test_fraggle_CFLAGS+= -Werror
endif
endif
endif
if NO_SERVER
else
libwebsockets_test_server_CFLAGS+= -Wall -std=gnu99 -pedantic -DINSTALL_DATADIR=\"@datadir@\" -DLWS_OPENSSL_CLIENT_CERTS=\"@clientcertdir@\"
libwebsockets_test_server_extpoll_CFLAGS+= -Wall -std=gnu99 -pedantic -DINSTALL_DATADIR=\"@datadir@\" -DLWS_OPENSSL_CLIENT_CERTS=\"@clientcertdir@\"
endif
if NO_CLIENT
else
libwebsockets_test_client_CFLAGS+= -Wall -std=gnu99 -pedantic -DINSTALL_DATADIR=\"@datadir@\" -DLWS_OPENSSL_CLIENT_CERTS=\"@clientcertdir@\"
if NO_SERVER
else
libwebsockets_test_fraggle_CFLAGS+= -Wall -std=gnu99 -pedantic -DINSTALL_DATADIR=\"@datadir@\" -DLWS_OPENSSL_CLIENT_CERTS=\"@clientcertdir@\"
endif
endif
if NOPING
else