I have a requirement to obtain the domain name from the destination IP from an
outgoing packet. I am successful in capturing and obtaining the destination IP
packets using the `netfilter` hook as shown below.
unsigned int hook_func_out(unsigned int hooknum, struct sk_buff * skb,
const struct net_device *in, const struct net_device *out, int (*okfn)(struct
sk_buff*))
{
ofs = 20; // Set theoffset to skip over the IP header.
{
struct iphdr *ip_header = (struct iphdr
*)skb_network_header(skb);
struct udphdr *udp_header;
struct tcphdr * tcp_header;
//Ican obtain the destination IP address of the packet
//like this
unsigned int dest_ip = (unsigned int)ip_header->daddr;
//or like this
char pkt_tbuf[16];
snprintf(pkt_tbuf, 16, "%pI4", &ip_header->daddr);
//here I need to obtain the domain name of the obtained destination
address
}
}
However, I have no idea on how to use that IP to obtain the domain name of the
obtained IP.
I tried many sources
(https://www.google.com/search?client=ubuntu&channel=fs&q=linux+kernel+programming+domain+name+from+IP+&ie=utf-8&oe=utf-8)
but did find any related information on the subject and will be really
grateful if you experts would provide any sample code/ references to perform
this task :)
Thank you very much :)
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