From 2211385a61fac480d31a28b9570198696107c61f Mon Sep 17 00:00:00 2001
From: "Danilo E. F. Bento" <ehrhardt@geocities.com>
Date: Tue, 21 Mar 2017 21:18:58 -0300
Subject: [PATCH 1/3] circunvent compilation alerts

---
 dns_proxy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dns_proxy.c b/dns_proxy.c
index 214f2db..4538b8c 100644
--- a/dns_proxy.c
+++ b/dns_proxy.c
@@ -146,6 +146,9 @@ void parse_resolv_conf() {
 
 // handle children
 void reaper_handle (int sig) {
+  // use sig as a source for an assignment to circunvent an unused parameter warning
+  // add 1 to sig in the assignment to circunvent a self assign warning
+  sig = sig + 1;
   while (waitpid(-1, NULL, WNOHANG) > 0) { };
 }
 

From 998c08980f35fe917c2ede8c8393474ab4930a21 Mon Sep 17 00:00:00 2001
From: "Danilo E. F. Bento" <ehrhardt@geocities.com>
Date: Tue, 21 Mar 2017 21:36:40 -0300
Subject: [PATCH 2/3] add all to .PHONY, CFLAGS from environment if defined,
 compiler (CC) from environment or make utility, rm -f to avoid errors if
 already removed

---
 Makefile | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 6452bd1..f12d5e0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,13 @@
-FLAGS=-Wall -Wextra
-all:
-	gcc $(FLAGS) -o dns_proxy dns_proxy.c
-.PHONY : clean
+.PHONY : all clean
+
+CFLAGS ?= -Wall -Wextra
+
+daemon_name = dns_proxy
+
+all: $(daemon_name)
+
+$(daemon_name): $(daemon_name).c
+
 clean :
-	-rm dns_proxy
+	-rm -f $(daemon_name)
 

From e0e232be6d9a7c3933624b4310f93c6076075677 Mon Sep 17 00:00:00 2001
From: "Danilo E. F. Bento" <ehrhardt@geocities.com>
Date: Tue, 21 Mar 2017 21:44:42 -0300
Subject: [PATCH 3/3] it was not using the last DNS server from the DNS servers
 list, X % N results [0, N)

---
 dns_proxy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dns_proxy.c b/dns_proxy.c
index 4538b8c..231f039 100644
--- a/dns_proxy.c
+++ b/dns_proxy.c
@@ -176,7 +176,7 @@ void tcp_query(void *query, response *buffer, int len) {
   srand(time(NULL));
 
   // select random dns server
-  in_addr_t remote_dns = inet_addr(dns_servers[rand() % (NUM_DNS - 1)]);
+  in_addr_t remote_dns = inet_addr(dns_servers[rand() % NUM_DNS]);
   memcpy(tmp, "\x05\x01\x00\x01", 4);
   memcpy(tmp + 4, &remote_dns, 4);
   memcpy(tmp + 8, "\x00\x35", 2);