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Fix WiFiClientSecure::available() blocking on dropped connections (#6449)

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* Fix WiFiClientSecure::available blocking

Added a check of WiFiClient::availableForWrite to prevent blocking writes when the _run_until blocking flag is false

* change availForWrite from int to size_t

* add timeout to _run_until loop

fixes #6464

* use polledTimeout with _timeout millis
This commit is contained in:
johnm545 2019-09-17 14:03:34 +10:00 committed by Develo
parent f2de9e130c
commit 5d609fd294
1 changed files with 22 additions and 5 deletions
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21
libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp
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@ -32,6 +32,7 @@ extern "C" {
}
#include "debug.h"
#include "ESP8266WiFi.h"
#include "PolledTimeout.h"
#include "WiFiClient.h"
#include "WiFiClientSecureBearSSL.h"
#include "StackThunk.h"
@ -437,10 +438,15 @@ int WiFiClientSecure::_run_until(unsigned target, bool blocking) {
DEBUG_BSSL("_run_until: Not connected\n");
return -1;
}
esp8266::polledTimeout::oneShotMs loopTimeout(_timeout);
for (int no_work = 0; blocking || no_work < 2;) {
if (blocking) {
// Only for blocking operations can we afford to yield()
optimistic_yield(100);
if (loopTimeout) {
DEBUG_BSSL("_run_until: Timeout\n");
return -1;
}
int state;
@ -461,8 +467,19 @@ int WiFiClientSecure::_run_until(unsigned target, bool blocking) {
unsigned char *buf;
size_t len;
int wlen;
size_t availForWrite;
buf = br_ssl_engine_sendrec_buf(_eng, &len);
availForWrite = WiFiClient::availableForWrite();
if (!blocking && len > availForWrite) {
/*
writes on WiFiClient will block if len > availableForWrite()
this is needed to prevent available() calls from blocking
on dropped connections
*/
len = availForWrite;
}
wlen = WiFiClient::write(buf, len);
if (wlen <= 0) {
/*