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lwip: Use hardware RNG for LWIP_RAND(), use LWIP_RAND() for random port assignment

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Angus Gratton
2017-07-20 10:04:20 +10:00
committed by Angus Gratton
parent 72995bfcec
commit 73b3ae8a2d
3 changed files with 7 additions and 9 deletions
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12
components/lwip/core/tcp.c
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@@ -696,14 +696,12 @@ tcp_new_port(void)
again:
#if ESP_RANDOM_TCP_PORT
tcp_port = system_get_time();
if (tcp_port < 0)
tcp_port = LWIP_RAND() - tcp_port;
tcp_port %= TCP_LOCAL_PORT_RANGE_START;
tcp_port = abs(LWIP_RAND()) % (TCP_LOCAL_PORT_RANGE_END - TCP_LOCAL_PORT_RANGE_START);
tcp_port += TCP_LOCAL_PORT_RANGE_START;
#else
if (tcp_port++ == TCP_LOCAL_PORT_RANGE_END) {
tcp_port = TCP_LOCAL_PORT_RANGE_START;
}
if (tcp_port++ == TCP_LOCAL_PORT_RANGE_END) {
tcp_port = TCP_LOCAL_PORT_RANGE_START;
}
#endif
/* Check all PCB lists. */