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mbedtls port: Fix detection of EWOULDBLOCK/EAGAIN with non-blocking sockets 

Since mbedtls_net_errno is reset by fcntl, it is reset after calling
net_would_block, so the call to mbedtls_net_errno in mbedtls_net_recv
and mbedtls_net_send will always get back 0. This change propagates
the value returned by mbedtls_net_errno up through net_would_block,
to allow the correct error value to be used and avoid a redundant
call to mbedtls_net_errno.

Merges PR #511 https://github.com/espressif/esp-idf/pull/511
pull/426/merge
Michael Kellner 2017-04-11 13:08:35 -07:00 zatwierdzone przez Angus Gratton
rodzic 793003d0fa
commit a523aa3ef5
1 zmienionych plików z 8 dodań i 6 usunięć
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14
components/mbedtls/port/net.c
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@ -201,10 +201,14 @@ int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char
*
* Note: on a blocking socket this function always returns 0!
*/
static int net_would_block( const mbedtls_net_context *ctx )
static int net_would_block( const mbedtls_net_context *ctx, int *errout )
{
int error = mbedtls_net_errno(ctx->fd);
if ( errout ) {
*errout = error;
}
/*
* Never return 'WOULD BLOCK' on a non-blocking socket
*/
@ -260,7 +264,7 @@ int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
}
if ( ret < 0 ) {
if ( net_would_block( bind_ctx ) != 0 ) {
if ( net_would_block( bind_ctx, NULL ) != 0 ) {
return ( MBEDTLS_ERR_SSL_WANT_READ );
}
@ -349,11 +353,10 @@ int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len )
ret = (int) read( fd, buf, len );
if ( ret < 0 ) {
if ( net_would_block( ctx ) != 0 ) {
if ( net_would_block( ctx, &error ) != 0 ) {
return ( MBEDTLS_ERR_SSL_WANT_READ );
}
error = mbedtls_net_errno(fd);
if ( error == EPIPE || error == ECONNRESET ) {
return ( MBEDTLS_ERR_NET_CONN_RESET );
}
@ -425,11 +428,10 @@ int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len )
ret = (int) write( fd, buf, len );
if ( ret < 0 ) {
if ( net_would_block( ctx ) != 0 ) {
if ( net_would_block( ctx, &error ) != 0 ) {
return ( MBEDTLS_ERR_SSL_WANT_WRITE );
}
error = mbedtls_net_errno(fd);
if ( error == EPIPE || error == ECONNRESET ) {
return ( MBEDTLS_ERR_NET_CONN_RESET );
}