Function connTLSRead

app/redis-6.2.6/src/tls.c:776–805

}

static int connTLSRead(connection *conn_, void *buf, size_t buf_len) {
    tls_connection *conn = (tls_connection *) conn_;
    int ret;
    int ssl_err;

    if (conn->c.state != CONN_STATE_CONNECTED) return -1;
    ERR_clear_error();
    ret = SSL_read(conn->ssl, buf, buf_len);
    if (ret <= 0) {
        WantIOType want = 0;
        if (!(ssl_err = handleSSLReturnCode(conn, ret, &want))) {
            if (want == WANT_WRITE) conn->flags |= TLS_CONN_FLAG_READ_WANT_WRITE;
            updateSSLEvent(conn);

            errno = EAGAIN;
            return -1;
        } else {
            if (ssl_err == SSL_ERROR_ZERO_RETURN ||
                    ((ssl_err == SSL_ERROR_SYSCALL) && !errno)) {
                conn->c.state = CONN_STATE_CLOSED;
                return 0;
            } else {
                conn->c.state = CONN_STATE_ERROR;
                return -1;
            }
        }
    }

    return ret;
}

static const char *connTLSGetLastError(connection *conn_) {
    tls_connection *conn = (tls_connection *) conn_;