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
---
main.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
dns.c | 5 ++---
2 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/dns.c b/dns.c
index 233050a..068753f 100644
--- a/dns.c
+++ b/dns.c
@@ -73,8 +73,8 @@
int s, i, j;
struct sockaddr_in dest, a;
unsigned char *qname, *reader;
- struct DNS_HEADER* dns = NULL;
- struct QUESTION* qinfo = NULL;
+ struct DNS_HEADER* dns = (struct DNS_HEADER*)buf;
+ struct QUESTION* qinfo;
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
dest.sin_family = AF_INET;
@@ -82,7 +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
diff --git a/main.c b/main.c
index cc01df3..721f769 100644
--- a/main.c
+++ b/main.c
@@ -1,9 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
#include "dns.h"
int main(int argc, char** argv)
{
+ int option, type = T_A;
+ char* server = "1.1.1.1", *hostname = "google.com";
+ while((option = getopt(argc, argv, "s:h:t:")) != -1) {
+ switch (option) {
+ case 's': //server to use
+ server = optarg;
+ break;
+ case 'h': //hostname to search
+ hostname = optarg;
+ break;
+ case 't':
+ if (!strcmp(optarg, "A")) {
+ type = T_A;
+ } else if (!strcmp(optarg, "AAAA")) {
+ type = T_AAAA;
+ } else if (!strcmp(optarg, "NS")) {
+ type = T_NS;
+ } else if (!strcmp(optarg, "CNAME")) {
+ type = T_CNAME;
+ } else if (!strcmp(optarg, "SOA")) {
+ type = T_SOA;
+ } else if (!strcmp(optarg, "PTR")) {
+ type = T_PTR;
+ } else if (!strcmp(optarg, "MX")) {
+ type = T_MX;
+ } else if (!strcmp(optarg, "TXT")) {
+ type = T_MX;
+ } else {
+ printf("Error: %s is not a valid DNS record type\n", optarg);
+ exit(1);
+ }
+ break;
+ case '?':
+ default:
+ printf("Error: invalid option -%c\n", optopt);
+ exit(1);
+ }
+ }
unsigned char buf[65536];
- resolve(buf, "google.com", "1.1.1.1", T_A);
+ resolve(buf, hostname, server, type);
print_packet(buf);
return 0;
}
--
Gitblit v1.10.0