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Implement ASN lookups in well-known nat64 prefix

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This commit is contained in:
Evan Pratten 2023-05-30 20:22:48 -04:00
parent 7ad8ef6951
commit 91035185dd
1 changed files with 25 additions and 4 deletions
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29
ui/asn.c
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@ -21,6 +21,7 @@
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sys/types.h>
#ifdef HAVE_ERROR_H
#include <error.h>
@ -215,6 +216,13 @@ static void reverse_host6(
}
#endif
#ifdef ENABLE_IPV6
static bool is_well_known_nat64(struct in6_addr *addr){
// 64:ff9b::
return addr->s6_addr[0] == 0x00 && addr->s6_addr[1] == 0x64 && addr->s6_addr[2] == 0xff && addr->s6_addr[3] == 0x9b;
}
#endif
static char *get_ipinfo(
struct mtr_ctl *ctl,
ip_t * addr)
@ -229,10 +237,23 @@ static char *get_ipinfo(
if (ctl->af == AF_INET6) {
#ifdef ENABLE_IPV6
reverse_host6(addr, key, NAMELEN);
if (snprintf(lookup_key, NAMELEN, "%s.%s", key, ctl->ipinfo_provider6)
>= NAMELEN)
return NULL;
if (is_well_known_nat64(addr)) {
// Treats the final 4 bytes as IPv4 address
unsigned char buff[4];
memcpy(buff, addr->s6_addr + 12, 4);
if (snprintf
(key, NAMELEN, "%d.%d.%d.%d", buff[3], buff[2], buff[1],
buff[0]) >= NAMELEN)
return NULL;
if (snprintf(lookup_key, NAMELEN, "%s.%s", key, ctl->ipinfo_provider4)
>= NAMELEN)
return NULL;
} else {
reverse_host6(addr, key, NAMELEN);
if (snprintf(lookup_key, NAMELEN, "%s.%s", key, ctl->ipinfo_provider6)
>= NAMELEN)
return NULL;
}
#else
return NULL;
#endif