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libwebsockets/lib/roles/ws/ext/extension.c
Andy Green c9731c5f17 type comparisons: fixes
This is a huge patch that should be a global NOP.

For unix type platforms it enables -Wconversion to issue warnings (-> error)
for all automatic casts that seem less than ideal but are normally concealed
by the toolchain.

This is things like passing an int to a size_t argument.  Once enabled, I
went through all args on my default build (which build most things) and
tried to make the removed default cast explicit.

With that approach it neither change nor bloat the code, since it compiles
to whatever it was doing before, just with the casts made explicit... in a
few cases I changed some length args from int to size_t but largely left
the causes alone.

From now on, new code that is relying on less than ideal casting
will complain and nudge me to improve it by warnings.
2021-01-05 10:56:38 +00:00

383 lines
8.5 KiB
C

/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "private-lib-core.h"
#include "extension-permessage-deflate.h"
void
lws_context_init_extensions(const struct lws_context_creation_info *info,
struct lws_context *context)
{
lwsl_info(" LWS_MAX_EXTENSIONS_ACTIVE: %u\n", LWS_MAX_EXTENSIONS_ACTIVE);
}
enum lws_ext_option_parser_states {
LEAPS_SEEK_NAME,
LEAPS_EAT_NAME,
LEAPS_SEEK_VAL,
LEAPS_EAT_DEC,
LEAPS_SEEK_ARG_TERM
};
int
lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
void *ext_user, const struct lws_ext_options *opts,
const char *in, int len)
{
enum lws_ext_option_parser_states leap = LEAPS_SEEK_NAME;
unsigned int match_map = 0, n, m, w = 0, count_options = 0,
pending_close_quote = 0;
struct lws_ext_option_arg oa;
oa.option_name = NULL;
while (opts[count_options].name)
count_options++;
while (len) {
lwsl_ext("'%c' %d", *in, leap);
switch (leap) {
case LEAPS_SEEK_NAME:
if (*in == ' ')
break;
if (*in == ',') {
len = 1;
break;
}
match_map = (unsigned int)(1 << count_options) - 1;
leap = LEAPS_EAT_NAME;
w = 0;
/* fallthru */
case LEAPS_EAT_NAME:
oa.start = NULL;
oa.len = 0;
m = match_map;
n = 0;
pending_close_quote = 0;
while (m) {
if (!(m & 1)) {
m >>= 1;
n++;
continue;
}
lwsl_ext(" m=%d, n=%d, w=%d\n", m, n, w);
if (*in == opts[n].name[w]) {
if (!opts[n].name[w + 1]) {
oa.option_index = (int)n;
lwsl_ext("hit %d\n",
oa.option_index);
leap = LEAPS_SEEK_VAL;
if (len == 1)
goto set_arg;
break;
}
} else {
match_map &= (unsigned int)~(1 << n);
if (!match_map) {
lwsl_ext("empty match map\n");
return -1;
}
}
m >>= 1;
n++;
}
w++;
break;
case LEAPS_SEEK_VAL:
if (*in == ' ')
break;
if (*in == ',') {
len = 1;
break;
}
if (*in == ';' || len == 1) { /* ie,nonoptional */
if (opts[oa.option_index].type == EXTARG_DEC)
return -1;
leap = LEAPS_SEEK_NAME;
goto set_arg;
}
if (*in == '=') {
w = 0;
pending_close_quote = 0;
if (opts[oa.option_index].type == EXTARG_NONE)
return -1;
leap = LEAPS_EAT_DEC;
break;
}
return -1;
case LEAPS_EAT_DEC:
if (*in >= '0' && *in <= '9') {
if (!w)
oa.start = in;
w++;
if (len != 1)
break;
}
if (!w && *in =='"') {
pending_close_quote = 1;
break;
}
if (!w)
return -1;
if (pending_close_quote && *in != '"' && len != 1)
return -1;
leap = LEAPS_SEEK_ARG_TERM;
if (oa.start)
oa.len = lws_ptr_diff(in, oa.start);
if (len == 1)
oa.len++;
set_arg:
ext->callback(lws_get_context(wsi),
ext, wsi, LWS_EXT_CB_OPTION_SET,
ext_user, (char *)&oa, 0);
if (len == 1)
break;
if (pending_close_quote && *in == '"')
break;
/* fallthru */
case LEAPS_SEEK_ARG_TERM:
if (*in == ' ')
break;
if (*in == ';') {
leap = LEAPS_SEEK_NAME;
break;
}
if (*in == ',') {
len = 1;
break;
}
return -1;
}
len--;
in++;
}
return 0;
}
/* 0 = nobody had nonzero return, 1 = somebody had positive return, -1 = fail */
int lws_ext_cb_active(struct lws *wsi, int reason, void *arg, int len)
{
int n, m, handled = 0;
if (!wsi->ws)
return 0;
for (n = 0; n < wsi->ws->count_act_ext; n++) {
m = wsi->ws->active_extensions[n]->callback(
lws_get_context(wsi), wsi->ws->active_extensions[n],
wsi, (enum lws_extension_callback_reasons)reason, wsi->ws->act_ext_user[n], arg, (size_t)len);
if (m < 0) {
lwsl_ext("Ext '%s' failed to handle callback %d!\n",
wsi->ws->active_extensions[n]->name, reason);
return -1;
}
/* valgrind... */
if (reason == LWS_EXT_CB_DESTROY)
wsi->ws->act_ext_user[n] = NULL;
if (m > handled)
handled = m;
}
return handled;
}
int lws_ext_cb_all_exts(struct lws_context *context, struct lws *wsi,
int reason, void *arg, int len)
{
int n = 0, m, handled = 0;
const struct lws_extension *ext;
if (!wsi || !wsi->a.vhost || !wsi->ws)
return 0;
ext = wsi->a.vhost->ws.extensions;
while (ext && ext->callback && !handled) {
m = ext->callback(context, ext, wsi, (enum lws_extension_callback_reasons)reason,
(void *)(lws_intptr_t)n, arg, (size_t)len);
if (m < 0) {
lwsl_ext("Ext '%s' failed to handle callback %d!\n",
wsi->ws->active_extensions[n]->name, reason);
return -1;
}
if (m)
handled = 1;
ext++;
n++;
}
return 0;
}
int
lws_issue_raw_ext_access(struct lws *wsi, unsigned char *buf, size_t len)
{
struct lws_tokens ebuf;
int ret, m, n = 0;
ebuf.token = buf;
ebuf.len = (int)len;
/*
* while we have original buf to spill ourselves, or extensions report
* more in their pipeline
*/
ret = 1;
while (ret == 1) {
/* default to nobody has more to spill */
ret = 0;
/* show every extension the new incoming data */
m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_TX_PRESEND,
&ebuf, 0);
if (m < 0)
return -1;
if (m) /* handled */
ret = 1;
if (buf != ebuf.token)
/*
* extension recreated it:
* need to buffer this if not all sent
*/
wsi->ws->clean_buffer = 0;
/* assuming they left us something to send, send it */
if (ebuf.len) {
n = lws_issue_raw(wsi, ebuf.token, (size_t)ebuf.len);
if (n < 0) {
lwsl_info("closing from ext access\n");
return -1;
}
/* always either sent it all or privately buffered */
if (wsi->ws->clean_buffer)
len = (size_t)n;
lwsl_ext("%s: written %d bytes to client\n",
__func__, n);
}
/* no extension has more to spill? Then we can go */
if (!ret)
break;
/* we used up what we had */
ebuf.token = NULL;
ebuf.len = 0;
/*
* Did that leave the pipe choked?
* Or we had to hold on to some of it?
*/
if (!lws_send_pipe_choked(wsi) && !lws_has_buffered_out(wsi))
/* no we could add more, lets's do that */
continue;
lwsl_debug("choked\n");
/*
* Yes, he's choked. Don't spill the rest now get a callback
* when he is ready to send and take care of it there
*/
lws_callback_on_writable(wsi);
wsi->ws->extension_data_pending = 1;
ret = 0;
}
return (int)len;
}
int
lws_any_extension_handled(struct lws *wsi, enum lws_extension_callback_reasons r,
void *v, size_t len)
{
struct lws_context *context = wsi->a.context;
int n, handled = 0;
if (!wsi->ws)
return 0;
/* maybe an extension will take care of it for us */
for (n = 0; n < wsi->ws->count_act_ext && !handled; n++) {
if (!wsi->ws->active_extensions[n]->callback)
continue;
handled |= wsi->ws->active_extensions[n]->callback(context,
wsi->ws->active_extensions[n], wsi,
r, wsi->ws->act_ext_user[n], v, len);
}
return handled;
}
int
lws_set_extension_option(struct lws *wsi, const char *ext_name,
const char *opt_name, const char *opt_val)
{
struct lws_ext_option_arg oa;
int idx = 0;
if (!wsi->ws)
return 0;
/* first identify if the ext is active on this wsi */
while (idx < wsi->ws->count_act_ext &&
strcmp(wsi->ws->active_extensions[idx]->name, ext_name))
idx++;
if (idx == wsi->ws->count_act_ext)
return -1; /* request ext not active on this wsi */
oa.option_name = opt_name;
oa.option_index = 0;
oa.start = opt_val;
oa.len = 0;
return wsi->ws->active_extensions[idx]->callback(wsi->a.context,
wsi->ws->active_extensions[idx], wsi,
LWS_EXT_CB_NAMED_OPTION_SET, wsi->ws->act_ext_user[idx],
&oa, 0);
}