From 8e7ea6742a94ea62b421d7184e9eab17fb5da934 Mon Sep 17 00:00:00 2001
From: Joel Grunbaum <joelgrun@gmail.com>
Date: Wed, 21 Oct 2020 12:29:13 +0000
Subject: [PATCH] Added threading, progress and some comments, nearly done
---
dns.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/dns.c b/dns.c
index 3784d2f..ad58873 100644
--- a/dns.c
+++ b/dns.c
@@ -69,6 +69,8 @@
char* rdata;
};
+// Test server dns_ip as IPv4 string for hostname
+// Writes received packet to buf, which is supplied and returns time for request
struct timespec resolve(unsigned char* buf, char* hostname, char* dns_ip, int query_type)
{
int s, i;
@@ -120,6 +122,7 @@
i = recvfrom(s, (char*)buf, 65536, 0, (struct sockaddr*)&dest, (socklen_t*)&i);
clock_gettime(CLOCK_MONOTONIC, &end);
+ // Make sure packet was returned
if (i == -1)
total.tv_nsec = -1;
else
@@ -132,6 +135,7 @@
return total;
}
+// Print dns packet content, not terribly reliable but works for testing resolve with A requests
void print_packet(unsigned char* buf)
{
struct RES_RECORD answers[20], auth[20], addit[20];
@@ -242,7 +246,8 @@
}
}
-
+// convert from dot format to dns format
+// eg google.com to 6google3com
void change_to_DNS_name_format(unsigned char* dns, unsigned char* host)
{
int lock = 0;
@@ -262,6 +267,7 @@
*dns++ = '\0';
}
+// Convert from dns to dot format
char* read_name(unsigned char* reader, unsigned char* buffer, int* count)
{
char* name;
--
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