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[rpd] Reserved Space/Available Space and potential hijacking
ben.roberts at afrinic.net
ben.roberts at afrinic.net
Wed Oct 15 11:54:50 UTC 2025
This is great Andrew. I feel like we should have more of this sort of thing and perhaps an IP address research hackathon will be a great idea.
Your c is pretty good, I will give you a tip though.
2 useful features of c are to use // or /* */ to insert comments in the code
e.g.
// This is a comment
Or
/* This is a comment*/
The comments aren’t compiled in the code so you can write anything you like. Using comments like this is really helpful when sharing code with others, to help them understand it…
😊😊😊
From: Andrew Alston <aa at alstonnetworks.net>
Sent: 15 October 2025 14:41
To: RPD <rpd at afrinic.net>
Subject: [rpd] Reserved Space/Available Space and potential hijacking
Hi Guys,
So - Firstly a few notes on using the code I'm going to paste below.
I created the BGP dump file on a juniper router by running a "show route protocol bgp | save bgp.dump.txt" and then copying that dump file to my local system from the Juniper router. Note - this produces a roughly 400meg file on a full table router and it takes quite a while to run the command.
Then - I used the delegated-afrinic-extended-latest file downloaded from the stats ftp server.
In the code below - if you wish to run similar - change the char BGP_DUMP[256] and char AFRINIC_EXT[256] global variables to match the pathing to the relevant files.
Note that there is some weirdness in this code to deal with endianness - and I will openly admit its not the cleanest (or probably most efficient) code - but it does work and I've verified the results.
I've pasted the code below the results section.
So - first the results:
Found 824064 total available addresses and 4482304 total reserved addresses
41.57.124.0/22 <http://41.57.124.0/22> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 1024 addresses to potential hijack]
41.57.124.0/23 <http://41.57.124.0/23> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 512 addresses to potential hijack]
41.57.124.0/24 <http://41.57.124.0/24> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 256 addresses to potential hijack]
41.57.125.0/24 <http://41.57.125.0/24> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 256 addresses to potential hijack]
41.57.126.0/24 <http://41.57.126.0/24> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 256 addresses to potential hijack]
41.57.127.0/24 <http://41.57.127.0/24> fell between reserved range 41.57.124.0 -> 41.57.127.255 [Adding 256 addresses to potential hijack]
41.77.64.0/21 <http://41.77.64.0/21> fell between reserved range 41.77.64.0 -> 41.77.71.255 [Adding 2048 addresses to potential hijack]
41.138.192.0/24 <http://41.138.192.0/24> fell between reserved range 41.138.192.0 -> 41.138.223.255 [Adding 256 addresses to potential hijack]
41.204.224.0/24 <http://41.204.224.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.225.0/24 <http://41.204.225.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.226.0/24 <http://41.204.226.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.227.0/24 <http://41.204.227.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.228.0/24 <http://41.204.228.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.229.0/24 <http://41.204.229.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.230.0/24 <http://41.204.230.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.231.0/24 <http://41.204.231.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.232.0/24 <http://41.204.232.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.233.0/24 <http://41.204.233.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.234.0/24 <http://41.204.234.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.235.0/24 <http://41.204.235.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.236.0/24 <http://41.204.236.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.237.0/24 <http://41.204.237.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.238.0/24 <http://41.204.238.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.239.0/24 <http://41.204.239.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.240.0/24 <http://41.204.240.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.241.0/24 <http://41.204.241.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.242.0/24 <http://41.204.242.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.243.0/24 <http://41.204.243.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.244.0/24 <http://41.204.244.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.245.0/24 <http://41.204.245.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.246.0/24 <http://41.204.246.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.247.0/24 <http://41.204.247.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.248.0/24 <http://41.204.248.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.249.0/24 <http://41.204.249.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.250.0/24 <http://41.204.250.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.251.0/24 <http://41.204.251.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.254.0/24 <http://41.204.254.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.204.255.0/24 <http://41.204.255.0/24> fell between reserved range 41.204.224.0 -> 41.204.255.255 [Adding 256 addresses to potential hijack]
41.205.224.0/19 <http://41.205.224.0/19> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 8192 addresses to potential hijack]
41.205.225.0/24 <http://41.205.225.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.232.0/24 <http://41.205.232.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.234.0/24 <http://41.205.234.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.235.0/24 <http://41.205.235.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.237.0/24 <http://41.205.237.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.238.0/24 <http://41.205.238.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.205.239.0/24 <http://41.205.239.0/24> fell between reserved range 41.205.224.0 -> 41.205.255.255 [Adding 256 addresses to potential hijack]
41.220.48.0/20 <http://41.220.48.0/20> fell between reserved range 41.220.48.0 -> 41.220.63.255 [Adding 4096 addresses to potential hijack]
80.88.6.0/24 <http://80.88.6.0/24> fell between reserved range 80.88.6.0 -> 80.88.6.255 [Adding 256 addresses to potential hijack]
102.128.74.0/24 <http://102.128.74.0/24> fell between reserved range 102.128.72.0 -> 102.128.75.255 [Adding 256 addresses to potential hijack]
102.135.164.0/24 <http://102.135.164.0/24> fell between reserved range 102.135.164.0 -> 102.135.167.255 [Adding 256 addresses to potential hijack]
102.135.165.0/24 <http://102.135.165.0/24> fell between reserved range 102.135.164.0 -> 102.135.167.255 [Adding 256 addresses to potential hijack]
102.135.166.0/24 <http://102.135.166.0/24> fell between reserved range 102.135.164.0 -> 102.135.167.255 [Adding 256 addresses to potential hijack]
102.219.128.0/24 <http://102.219.128.0/24> fell between reserved range 102.219.128.0 -> 102.219.131.255 [Adding 256 addresses to potential hijack]
102.219.129.0/24 <http://102.219.129.0/24> fell between reserved range 102.219.128.0 -> 102.219.131.255 [Adding 256 addresses to potential hijack]
102.219.130.0/24 <http://102.219.130.0/24> fell between reserved range 102.219.128.0 -> 102.219.131.255 [Adding 256 addresses to potential hijack]
102.221.148.0/22 <http://102.221.148.0/22> fell between reserved range 102.221.144.0 -> 102.221.151.255 [Adding 1024 addresses to potential hijack]
156.0.254.0/24 <http://156.0.254.0/24> fell between reserved range 156.0.254.0 -> 156.0.254.255 [Adding 256 addresses to potential hijack]
160.119.208.0/24 <http://160.119.208.0/24> fell between reserved range 160.119.208.0 -> 160.119.211.255 [Adding 256 addresses to potential hijack]
160.119.209.0/24 <http://160.119.209.0/24> fell between reserved range 160.119.208.0 -> 160.119.211.255 [Adding 256 addresses to potential hijack]
164.160.192.0/21 <http://164.160.192.0/21> fell between reserved range 164.160.192.0 -> 164.160.223.255 [Adding 2048 addresses to potential hijack]
169.255.164.0/22 <http://169.255.164.0/22> fell between reserved range 169.255.164.0 -> 169.255.167.255 [Adding 1024 addresses to potential hijack]
193.188.7.0/24 <http://193.188.7.0/24> fell between reserved range 193.188.7.0 -> 193.188.7.255 [Adding 256 addresses to potential hijack]
196.13.203.0/24 <http://196.13.203.0/24> fell between reserved range 196.13.203.0 -> 196.13.203.255 [Adding 256 addresses to potential hijack]
196.20.60.0/24 <http://196.20.60.0/24> fell between reserved range 196.20.32.0 -> 196.20.63.255 [Adding 256 addresses to potential hijack]
196.20.61.0/24 <http://196.20.61.0/24> fell between reserved range 196.20.32.0 -> 196.20.63.255 [Adding 256 addresses to potential hijack]
196.20.62.0/24 <http://196.20.62.0/24> fell between reserved range 196.20.32.0 -> 196.20.63.255 [Adding 256 addresses to potential hijack]
196.41.74.0/24 <http://196.41.74.0/24> fell between reserved range 196.41.74.0 -> 196.41.74.255 [Adding 256 addresses to potential hijack]
196.43.252.0/24 <http://196.43.252.0/24> fell between reserved range 196.43.252.0 -> 196.43.252.255 [Adding 256 addresses to potential hijack]
196.46.18.0/24 <http://196.46.18.0/24> fell between reserved range 196.46.18.0 -> 196.46.19.255 [Adding 256 addresses to potential hijack]
196.46.19.0/24 <http://196.46.19.0/24> fell between reserved range 196.46.18.0 -> 196.46.19.255 [Adding 256 addresses to potential hijack]
196.46.152.0/24 <http://196.46.152.0/24> fell between reserved range 196.46.152.0 -> 196.46.159.255 [Adding 256 addresses to potential hijack]
196.46.153.0/24 <http://196.46.153.0/24> fell between reserved range 196.46.152.0 -> 196.46.159.255 [Adding 256 addresses to potential hijack]
196.46.154.0/23 <http://196.46.154.0/23> fell between reserved range 196.46.152.0 -> 196.46.159.255 [Adding 512 addresses to potential hijack]
196.50.21.0/24 <http://196.50.21.0/24> fell between reserved range 196.50.21.0 -> 196.50.21.255 [Adding 256 addresses to potential hijack]
196.53.113.0/24 <http://196.53.113.0/24> fell between reserved range 196.52.0.0 -> 196.55.255.255 [Adding 256 addresses to potential hijack]
196.54.72.0/23 <http://196.54.72.0/23> fell between reserved range 196.52.0.0 -> 196.55.255.255 [Adding 512 addresses to potential hijack]
196.55.102.0/23 <http://196.55.102.0/23> fell between reserved range 196.52.0.0 -> 196.55.255.255 [Adding 512 addresses to potential hijack]
196.63.243.0/24 <http://196.63.243.0/24> fell between reserved range 196.62.0.0 -> 196.63.255.255 [Adding 256 addresses to potential hijack]
196.195.4.0/24 <http://196.195.4.0/24> fell between reserved range 196.194.0.0 -> 196.195.255.255 [Adding 256 addresses to potential hijack]
196.195.15.0/24 <http://196.195.15.0/24> fell between reserved range 196.194.0.0 -> 196.195.255.255 [Adding 256 addresses to potential hijack]
196.195.253.0/24 <http://196.195.253.0/24> fell between reserved range 196.194.0.0 -> 196.195.255.255 [Adding 256 addresses to potential hijack]
197.157.200.0/22 <http://197.157.200.0/22> fell between reserved range 197.157.200.0 -> 197.157.203.255 [Adding 1024 addresses to potential hijack]
197.231.248.0/22 <http://197.231.248.0/22> fell between reserved range 197.231.248.0 -> 197.231.251.255 [Adding 1024 addresses to potential hijack]
197.231.248.0/24 <http://197.231.248.0/24> fell between reserved range 197.231.248.0 -> 197.231.251.255 [Adding 256 addresses to potential hijack]
197.231.249.0/24 <http://197.231.249.0/24> fell between reserved range 197.231.248.0 -> 197.231.251.255 [Adding 256 addresses to potential hijack]
197.231.250.0/24 <http://197.231.250.0/24> fell between reserved range 197.231.248.0 -> 197.231.251.255 [Adding 256 addresses to potential hijack]
197.231.251.0/24 <http://197.231.251.0/24> fell between reserved range 197.231.248.0 -> 197.231.251.255 [Adding 256 addresses to potential hijack]
197.234.208.0/24 <http://197.234.208.0/24> fell between reserved range 197.234.208.0 -> 197.234.215.255 [Adding 256 addresses to potential hijack]
212.12.224.0/24 <http://212.12.224.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.225.0/24 <http://212.12.225.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.226.0/24 <http://212.12.226.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.227.0/24 <http://212.12.227.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.229.0/24 <http://212.12.229.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.231.0/24 <http://212.12.231.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.232.0/24 <http://212.12.232.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.233.0/24 <http://212.12.233.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.234.0/24 <http://212.12.234.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.235.0/24 <http://212.12.235.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.236.0/24 <http://212.12.236.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.237.0/24 <http://212.12.237.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.238.0/24 <http://212.12.238.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.239.0/24 <http://212.12.239.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.240.0/24 <http://212.12.240.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.241.0/24 <http://212.12.241.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.242.0/24 <http://212.12.242.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.243.0/24 <http://212.12.243.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.244.0/24 <http://212.12.244.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.245.0/24 <http://212.12.245.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.246.0/24 <http://212.12.246.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.247.0/24 <http://212.12.247.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.248.0/24 <http://212.12.248.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.249.0/24 <http://212.12.249.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.250.0/24 <http://212.12.250.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.251.0/24 <http://212.12.251.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.252.0/24 <http://212.12.252.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.254.0/24 <http://212.12.254.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
212.12.255.0/24 <http://212.12.255.0/24> fell between reserved range 212.12.224.0 -> 212.12.255.255 [Adding 256 addresses to potential hijack]
Found 50176 potentially hijacked addresses
--- Below here is the code (I didn't know if I could send attachments to the RPD list so I just pasted the code straight) ---
//
// main.c
// AfrinicAudit
//
// Created by Andrew Alston on 15/10/2025.
// Code is considered open use with no restrictions.
//
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
char BGP_DUMP[256] = "/Users/aalston/audit/bgp.dump.txt";
char AFRINIC_EXT[256] = "/Users/aalston/audit/delegated-afrinic-extended-latest";
struct routes {
unsigned int network;
unsigned int broadcast;
unsigned int mask;
unsigned short cidr;
};
struct audit {
struct routes *dfz;
int dfz_count;
struct routes *reserved;
int total_resv;
int rc;
struct routes *available;
int total_avail;
int ac;
};
int parse_afrinic_extended(char *afext, struct audit *output) {
FILE *dump = fopen(afext, "r");
if(!dump)
return -1;
char buffer[1024] = {0};
char *delim;
output->rc = 0;
while(fgets(buffer, 1024, dump)) {
if(strstr(buffer, "ZZ") && strstr(buffer, "reserved") && strstr(buffer, "ipv4")) {
output->rc++;
}
}
output->reserved = calloc(output->rc, sizeof(struct routes));
if(!output->reserved)
return -1;
output->rc = 0;
struct routes *resv = output->reserved;
rewind(dump);
while(fgets(buffer, 1024, dump)) {
if(strstr(buffer, "ZZ") && strstr(buffer, "reserved") && strstr(buffer, "ipv4")) {
delim = strtok(buffer, "|");
for(int i = 0; i < 3; i++)
delim = strtok(NULL, "|");
inet_pton(AF_INET, delim, &resv[output->rc].network);
resv[output->rc].network = __builtin_bswap32(resv[output->rc].network);
delim = strtok(NULL, "|");
unsigned int addr_count = atoi(delim);
output->total_resv += addr_count;
resv[output->rc].broadcast = resv[output->rc].network+(addr_count-1);
resv[output->rc].network = __builtin_bswap32(resv[output->rc].network);
resv[output->rc].broadcast = __builtin_bswap32(resv[output->rc].broadcast);
resv[output->rc].mask = ~__builtin_bswap32((unsigned int)addr_count-1);
output->rc++;
}
}
rewind(dump);
while(fgets(buffer, 1024, dump)) {
if(strstr(buffer, "ZZ") && strstr(buffer, "available") && strstr(buffer, "ipv4")) {
output->ac++;
}
}
output->available = calloc(output->ac, sizeof(struct routes));
if(!output->available)
return -1;
struct routes *avail = output->available;
rewind(dump);
while(fgets(buffer, 1024, dump)) {
if(strstr(buffer, "ZZ") && strstr(buffer, "available") && strstr(buffer, "ipv4")) {
delim = strtok(buffer, "|");
for(int i = 0; i < 3; i++)
delim = strtok(NULL, "|");
inet_pton(AF_INET, delim, &avail[output->ac].network);
avail[output->ac].network = __builtin_bswap32(avail[output->ac].network);
delim = strtok(NULL, "|");
unsigned int addr_count = atoi(delim);
output->total_avail += addr_count;
avail[output->ac].broadcast = avail[output->ac].network+(addr_count-1);
avail[output->ac].mask = ~__builtin_bswap32((unsigned int)addr_count-1);
output->ac++;
}
}
fclose(dump);
return 0;
}
int parse_dfz(char *dfz_dump, struct audit *output) {
FILE *dump = fopen(dfz_dump, "r");
char buffer[1024] = {0};
int rc = 0, mult = 0, cidr = 0;
char *delim;
if(!dump) {
return -1;
}
while(fgets(buffer, 1024, dump)) {
if(buffer[0] >= '1' && buffer[0] <= '9' && strtok(buffer, "/") && strchr(buffer, '.')) {
rc++;
}
}
output->dfz = calloc(rc, sizeof(struct routes));
output->dfz_count = rc;
if(!output->dfz) {
return -1;
}
rewind(dump);
rc = 0;
while(fgets(buffer, 1024, dump)) {
if(buffer[0] >= '1' && buffer[0] <= '9') {
cidr = 0;
delim = strtok(buffer, "/");
delim = strtok(NULL, "/");
if(!delim) {
memset(buffer, 0, 1024);
continue;
}
mult = 1;
for(int i = 0; i < 3; i++) {
if(delim[i] >= '0' && delim[i] <= '9') {
cidr = cidr * mult+(9-('9'-delim[i]));
mult*=10;
}
}
delim = strchr(buffer, '.');
if(!delim) {
memset(buffer, 0, 1024);
continue;
}
output->dfz[rc].cidr = cidr;
inet_pton(AF_INET, buffer, &output->dfz[rc].network);
output->dfz[rc].cidr = cidr;
output->dfz[rc].network = __builtin_bswap32((unsigned int)output->dfz[rc].network);
output->dfz[rc].mask = (~(unsigned int)0) << (32-cidr);
output->dfz[rc].broadcast = output->dfz[rc].network + ((~(unsigned int)0) >> cidr);
output->dfz[rc].network = __builtin_bswap32((unsigned int)output->dfz[rc].network);
output->dfz[rc].broadcast = __builtin_bswap32((unsigned int)output->dfz[rc].broadcast);
rc++;
memset(buffer, 0, 1024);
}
}
fclose(dump);
return 0;
}
int audit_reserved(struct audit *data) {
int hijack_count = 0;
for(int i = 0; i < data->dfz_count; i++) {
unsigned int dfz_net = __builtin_bswap32((unsigned int)data->dfz[i].network);
unsigned int dfz_bcast = __builtin_bswap32((unsigned int)data->dfz[i].broadcast);
for(int r = 0; r < data->rc; r++) {
unsigned int resv_net = __builtin_bswap32((unsigned int)data->reserved[r].network);
unsigned int resv_bcast = __builtin_bswap32((unsigned int)data->reserved[r].broadcast);
if(dfz_net >= resv_net && dfz_net <= resv_bcast) {
hijack_count += ((dfz_bcast-dfz_net)+1);
char dfz_route[INET_ADDRSTRLEN] = {0};
char resv_network[INET_ADDRSTRLEN] = {0};
char resv_broadcast[INET_ADDRSTRLEN] = {0};
inet_ntop(AF_INET, &data->dfz[i].network, dfz_route, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &data->reserved[r].network, resv_network, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &data->reserved[r].broadcast, resv_broadcast, INET_ADDRSTRLEN);
printf("%s/%d fell between reserved range %s -> %s [Adding %d addresses to potential hijack]\n",
dfz_route, data->dfz[i].cidr, resv_network, resv_broadcast, (dfz_bcast-dfz_net)+1);
}
}
for(int a = 0; a < data->ac; a++) {
unsigned int avail_net = __builtin_bswap32((unsigned int)data->available[a].network);
unsigned int avail_bcast = __builtin_bswap32((unsigned int)data->available[a].broadcast);
if(dfz_net >= data->available[a].network && dfz_net <= data->available[a].broadcast) {
hijack_count += ((data->available[a].broadcast-data->available[a].network)+1);
char dfz_route[INET_ADDRSTRLEN] = {0};
char avail_network[INET_ADDRSTRLEN] = {0};
char avail_broadcast[INET_ADDRSTRLEN] = {0};
inet_ntop(AF_INET, &data->dfz[i].network, dfz_route, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &avail_net, avail_network, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &avail_bcast, avail_broadcast, INET_ADDRSTRLEN);
printf("%s/%d fell between available range %s -> %s\n", dfz_route, data->dfz[i].cidr, avail_network, avail_broadcast);
}
}
}
printf("Found %d potentially hijacked addresses\n", hijack_count);
return 0;
}
int main(int argc, const char * argv[]) {
struct audit data = {0};
if(parse_dfz(BGP_DUMP, &data))
return EXIT_FAILURE;
if(parse_afrinic_extended(AFRINIC_EXT, &data))
return EXIT_FAILURE;
printf("Found %d total available addresses and %d total reserved addresses\n", data.total_avail, data.total_resv);
audit_reserved(&data);
return EXIT_SUCCESS;
}
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