From 2edf2937403e6448f155b31403a4c43d5fe277d4 Mon Sep 17 00:00:00 2001
From: Joel Grunbaum <joelgrun@gmail.com>
Date: Sun, 18 Oct 2020 13:03:16 +0000
Subject: [PATCH] added command line arguments
---
dns.c | 19 ++++++++-----------
1 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/dns.c b/dns.c
index 042902b..068753f 100644
--- a/dns.c
+++ b/dns.c
@@ -9,6 +9,9 @@
#include <unistd.h>
#include "dns.h"
+void change_to_DNS_name_format(unsigned char* dns, unsigned char* host);
+char* read_name(unsigned char* reader, unsigned char* buffer, int* count);
+
// DNS code copied from
// https://gist.github.com/fffaraz/9d9170b57791c28ccda9255b48315168
@@ -26,7 +29,7 @@
unsigned char ad :1; //authenticated data
unsigned char z :1; //reserved for future use
unsigned char ra :1; //recursion available
- unsigned short q_count; //number of question entries
+ unsigned short q_count; //number of question entrise
unsigned short ans_count; //number of answer entries
unsigned short auth_count; //number of authority entries
unsigned short add_count; //number of resource entries
@@ -65,13 +68,13 @@
unsigned char* rdata;
};
-void resolve(char* hostname, char* dns_ip, int query_type, int read)
+void resolve(unsigned char* buf, char* hostname, char* dns_ip, int query_type)
{
int s, i, j;
struct sockaddr_in dest, a;
- unsigned char buf[65536], *qname, *reader;
- struct DNS_HEADER* dns = NULL;
- struct QUESTION* qinfo = NULL;
+ unsigned char *qname, *reader;
+ struct DNS_HEADER* dns = (struct DNS_HEADER*)buf;
+ struct QUESTION* qinfo;
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
dest.sin_family = AF_INET;
@@ -79,7 +82,6 @@
dest.sin_addr.s_addr = inet_addr(dns_ip);
//dns packet header
- dns = (struct DNS_HEADER*)&buf;
dns->id = (unsigned short) htons(getpid());
dns->qr = 0; //make query
dns->opcode = 0; //standard query
@@ -111,11 +113,6 @@
//negative return is a fail
i = sizeof(dest);
recvfrom(s, (char*)buf, 65536, 0, (struct sockaddr*)&dest, (socklen_t*)&i);
-
- //read response
- if (read) {
- print_packet(buf);
- }
return;
}
--
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