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cellular: random socket port number #7097

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Merged
merged 2 commits into from Jun 11, 2018
Merged

cellular: random socket port number #7097

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b7bad77
random socket port number
Jun 1, 2018
d3a46eb
more effective port randomisation
Jun 5, 2018
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25 changes: 20 additions & 5 deletions features/cellular/framework/common/CellularUtil.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,14 @@
#include <string.h>
#include <stdlib.h>


#include "randLIB.h"
#define RANDOM_PORT_NUMBER_START 49152
#define RANDOM_PORT_NUMBER_END 65535
#define RANDOM_PORT_NUMBER_COUNT (RANDOM_PORT_NUMBER_END - RANDOM_PORT_NUMBER_START + 1)
#define RANDOM_PORT_NUMBER_MAX_STEP 100


namespace mbed_cellular_util {

void convert_ipv6(char* ip)
Expand Down Expand Up @@ -315,12 +323,19 @@ int char_str_to_hex_str(const char* str, uint16_t len, char *buf, bool omit_lead

uint16_t get_dynamic_ip_port()
{
static uint16_t port;
port++;
if (port < 49152) {
port = 49152;
static uint16_t port_counter = RANDOM_PORT_NUMBER_COUNT;

if (port_counter == RANDOM_PORT_NUMBER_COUNT) {
randLIB_seed_random();
port_counter = randLIB_get_random_in_range(0, RANDOM_PORT_NUMBER_COUNT - 1);
}

port_counter += randLIB_get_random_in_range(1, RANDOM_PORT_NUMBER_MAX_STEP);
if (port_counter >= RANDOM_PORT_NUMBER_COUNT) {
port_counter -= RANDOM_PORT_NUMBER_COUNT;
}
return port;

return (RANDOM_PORT_NUMBER_START + port_counter);
}

} // namespace mbed_cellular_util