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Merge pull request #7097 from TeemuKultala/random_port 

cellular: random socket port number
pull/7151/head
Cruz Monrreal 2018-06-11 08:57:47 -05:00 committed by GitHub
parent 10b859779d d3a46eb7cd
commit 5e8a0a853a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 5 deletions
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25
features/cellular/framework/common/CellularUtil.cpp
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@ -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)
@ -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);
}
return port;
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 (RANDOM_PORT_NUMBER_START + port_counter);
}
} // namespace mbed_cellular_util