From ef50ea9c5e2e5e90c0944e4b0f5a552228d87eab Mon Sep 17 00:00:00 2001
From: Nick Peng <pymumu@gmail.com>
Date: Wed, 19 Jun 2019 23:42:06 +0800
Subject: [PATCH] Change rule domain to lowercase

---
 src/dns_conf.c   | 4 ++--
 src/dns_server.c | 4 ++--
 src/util.c       | 8 +++++++-
 src/util.h       | 2 +-
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/dns_conf.c b/src/dns_conf.c
index c44466d..9886f8a 100644
--- a/src/dns_conf.c
+++ b/src/dns_conf.c
@@ -344,7 +344,7 @@ static int _config_domain_rule_add(char *domain, enum domain_rule type, void *ru
 		tlog(TLOG_ERROR, "domain name %s too long", domain);
 		goto errout;
 	}
-	reverse_string(domain_key, domain, len);
+	reverse_string(domain_key, domain, len, 1);
 	domain_key[len] = '.';
 	len++;
 	domain_key[len] = 0;
@@ -405,7 +405,7 @@ static int _config_domain_rule_flag_set(char *domain, unsigned int flag)
 		tlog(TLOG_ERROR, "domain %s too long", domain);
 		return -1;
 	}
-	reverse_string(domain_key, domain, len);
+	reverse_string(domain_key, domain, len, 1);
 	domain_key[len] = '.';
 	len++;
 	domain_key[len] = 0;
diff --git a/src/dns_server.c b/src/dns_server.c
index 9c9fec1..c4eece8 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -1375,7 +1375,7 @@ static void _dns_server_log_rule(char *domain, unsigned char *rule_key, int rule
 		return;
 	}
 
-	reverse_string(rule_name, (char *)rule_key, rule_key_len);
+	reverse_string(rule_name, (char *)rule_key, rule_key_len, 1);
 	rule_name[rule_key_len] = 0;
 	tlog(TLOG_INFO, "RULE-MATCH, domain: %s, rule: %s", domain, rule_name);
 }
@@ -1390,7 +1390,7 @@ static struct dns_domain_rule *_dns_server_get_domain_rule(char *domain)
 
 	/* reverse domain string */
 	domain_len = strlen(domain);
-	reverse_string(domain_key, domain, domain_len);
+	reverse_string(domain_key, domain, domain_len, 1);
 	domain_key[domain_len] = '.';
 	domain_len++;
 	domain_key[domain_len] = 0;
diff --git a/src/util.c b/src/util.c
index 2fce2a4..32874b8 100644
--- a/src/util.c
+++ b/src/util.c
@@ -350,7 +350,7 @@ int set_fd_nonblock(int fd, int nonblock)
 	return 0;
 }
 
-char *reverse_string(char *output, char *input, int len)
+char *reverse_string(char *output, char *input, int len, int to_lower_case)
 {
 	char *begin = output;
 	if (len <= 0) {
@@ -361,6 +361,12 @@ char *reverse_string(char *output, char *input, int len)
 	len--;
 	while (len >= 0) {
 		*output = *(input + len);
+		if (to_lower_case) {
+			if (*output >= 'A' && *output <= 'Z') {
+				/* To lower case */
+         		*output = *output + 32;
+      		}
+		}
 		output++;
 		len--;
 	}
diff --git a/src/util.h b/src/util.h
index c4b908f..c7f9f58 100644
--- a/src/util.h
+++ b/src/util.h
@@ -23,7 +23,7 @@ int parse_uri(char *value, char *scheme, char *host, int *port, char *path);
 
 int set_fd_nonblock(int fd, int nonblock);
 
-char *reverse_string(char *output, char *input, int len);
+char *reverse_string(char *output, char *input, int len, int to_lower_case);
 
 void print_stack(void);