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add zone_id to link-local ipv6 addresses

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F. Duncanh
2024-05-12 01:24:38 -04:00
parent cafc03e0df
commit f0407d780e
9 changed files with 76 additions and 57 deletions
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26
lib/utils.c
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@@ -256,3 +256,29 @@ void ntp_timestamp_to_seconds(uint64_t ntp_timestamp, char *timestamp, size_t ma
strftime(timestamp, 3, "%S", &ts);
snprintf(timestamp + 2, 11,".%9.9lu", (unsigned long) ntp_timestamp % SECOND_IN_NSECS);
}
int utils_ipaddress_to_string(int addresslen, const unsigned char *address, unsigned int zone_id, char *string, int sizeof_string) {
int ret = 0;
unsigned char ipv6_link_local_prefix[] = { 0xfe, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
assert(sizeof_string > 0);
assert(string);
if (addresslen != 4 && addresslen != 16) { //invalid address length (only ipv4 and ipv6 allowed)
string[0] = '\0';
}
if (addresslen == 4) { /* IPV4 */
ret = snprintf(string, sizeof_string, "%d.%d.%d.%d", address[0], address[1], address[2], address[3]);
} else if (zone_id) { /* IPV6 link-local */
if (memcmp(address, ipv6_link_local_prefix, 8)) {
string[0] = '\0'; //only link-local ipv6 addresses can have a zone_id
} else {
ret = snprintf(string, sizeof_string, "fe80::%02x%02x:%02x%02x:%02x%02x:%02x%02x%%%u",
address[8], address[9], address[10], address[11],
address[12], address[13], address[14], address[15], zone_id);
}
} else { /* IPV6 standard*/
ret = snprintf(string, sizeof_string, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
address[0], address[1], address[2], address[3], address[4], address[5], address[6], address[7],
address[8], address[9], address[10], address[11], address[12], address[13], address[14], address[15]);
}
return ret;
}