diff --git a/include/dns.h b/include/dns.h
index 7996474..d816263 100644
--- a/include/dns.h
+++ b/include/dns.h
@@ -1,6 +1,6 @@
-#ifndef _DNS_H_
-#define _DNS_H_
-
-char* dns_resolve(char *domain);
-
-#endif
+#ifndef _DNS_H_
+#define _DNS_H_
+
+char* dns_resolve(char *domain);
+
+#endif
diff --git a/src/dns.c b/src/dns.c
index 4b0b03f..dea7479 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -1,103 +1,103 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <netdb.h>
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include "dns.h"
-
-char** init_dns_result();
-char** add_dns_result(char **dns_result, char *str);
-void free_dns_result(char **dns_result);
-char** ipv4_dns_resolve(char *domain);
-char** ipv6_dns_resolve(char *domain);
-
-char** init_dns_result() { // 初始化DNS解析存储结构
-    char **dns_result = (char**)malloc(sizeof(char*));
-    dns_result[0] = NULL;
-    return dns_result;
-}
-
-char** add_dns_result(char **dns_result, char *str) { // 添加DNS解析记录
-    int num = 0;
-    while(dns_result[num++] != NULL); // 获取原存储个数
-    dns_result = (char**)realloc(dns_result, sizeof(char**) * (num + 1));
-    dns_result[num - 1] = strcpy((char*)malloc(strlen(str) + 1), str);
-    dns_result[num] = NULL; // 结束标志
-    return dns_result;
-}
-
-void free_dns_result(char **dns_result) { // 释放DNS解析结果
-    int num = 0;
-    while(dns_result[num] != NULL) { // 逐个释放
-        free(dns_result[num++]);
-    }
-}
-
-char** ipv4_dns_resolve(char *domain) { // DNS解析IPv4地址
-    char **result = init_dns_result();
-    char ip_str[16]; // IPv4地址字符串 (3 * 4 + 1 * 3 + 1)
-    struct sockaddr_in *ipv4_addr;
-    struct addrinfo *answer, hint, *p;
-    bzero(&hint, sizeof(hint)); // 清空为0x00
-    hint.ai_family = AF_INET;
-    hint.ai_socktype = SOCK_STREAM;
-    int ret = getaddrinfo(domain, NULL, &hint, &answer); // 发起解析
-    if (ret != 0) { // 解析失败
-        printf("[Shadowsocks Bootstrap] IPv4 DNS resolve `%s`: %s\n", domain, gai_strerror(ret));
-        return result; // 返回空数据
-    }
-    for (p = answer; p != NULL; p = p->ai_next) { // 遍历解析结果
-        ipv4_addr = (struct sockaddr_in*)(p->ai_addr); // 获取IPv4地址
-        inet_ntop(AF_INET, &ipv4_addr->sin_addr, ip_str, sizeof(ip_str)); // 转化为字符串形式
-        result = add_dns_result(result, ip_str);
-    }
-    freeaddrinfo(answer); // 释放解析结果
-    return result;
-}
-
-char** ipv6_dns_resolve(char *domain) { // DNS解析IPv6地址
-    char **result = init_dns_result();
-    char ip_str[40]; // IPv6地址字符串 (4 * 8 + 1 * 7 + 1)
-    struct sockaddr_in6 *ipv6_addr;
-    struct addrinfo *answer, hint, *p;
-    bzero(&hint, sizeof(hint)); // 清空为0x00
-    hint.ai_family = AF_INET6;
-    hint.ai_socktype = SOCK_STREAM;
-    int ret = getaddrinfo(domain, NULL, &hint, &answer); // 发起解析
-    if (ret != 0) { // 解析失败
-        printf("[Shadowsocks Bootstrap] IPv6 DNS resolve `%s`: %s\n", domain, gai_strerror(ret));
-        return result; // 返回空数据
-    }
-    for (p = answer; p != NULL; p = p->ai_next) { // 遍历解析结果
-        ipv6_addr = (struct sockaddr_in6*)(p->ai_addr); // 获取IPv6地址
-        inet_ntop(AF_INET6, &ipv6_addr->sin6_addr, ip_str, sizeof(ip_str)); // 转化为字符串形式
-        result = add_dns_result(result, ip_str);
-    }
-    freeaddrinfo(answer); // 释放解析结果
-    return result;
-}
-
-char* dns_resolve(char *domain) { // DNS解析 返回首个IP地址 IPv4优先
-    int num = 0;
-    char **result = init_dns_result();
-    result = ipv4_dns_resolve(domain); // IPv4解析
-    while(result[num++] != NULL); // num - 1 为IPv4地址数
-    if (num - 1 != 0) { // 存在IPv4解析
-        char *tmp = strcpy((char*)malloc(strlen(result[0]) + 1), result[0]);
-        free_dns_result(result); // 释放IPv4结果
-        return tmp; // 返回首个IPv4地址
-    }
-    free_dns_result(result); // 释放IPv4结果
-    result = ipv6_dns_resolve(domain);
-    num = 0;
-    while(result[num++] != NULL); // num - 1 为IPv6地址数
-    if (num - 1 == 0) { // 无IPv6解析
-        free_dns_result(result); // 释放IPv6结果
-        return NULL;
-    }
-    char *tmp = strcpy((char*)malloc(strlen(result[0]) + 1), result[0]);
-    free_dns_result(result); // 释放IPv6结果
-    return tmp; // 返回首个IPv6地址
-}
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include "dns.h"
+
+char** init_dns_result();
+char** add_dns_result(char **dns_result, char *str);
+void free_dns_result(char **dns_result);
+char** ipv4_dns_resolve(char *domain);
+char** ipv6_dns_resolve(char *domain);
+
+char** init_dns_result() { // 初始化DNS解析存储结构
+    char **dns_result = (char**)malloc(sizeof(char*));
+    dns_result[0] = NULL;
+    return dns_result;
+}
+
+char** add_dns_result(char **dns_result, char *str) { // 添加DNS解析记录
+    int num = 0;
+    while(dns_result[num++] != NULL); // 获取原存储个数
+    dns_result = (char**)realloc(dns_result, sizeof(char**) * (num + 1));
+    dns_result[num - 1] = strcpy((char*)malloc(strlen(str) + 1), str);
+    dns_result[num] = NULL; // 结束标志
+    return dns_result;
+}
+
+void free_dns_result(char **dns_result) { // 释放DNS解析结果
+    int num = 0;
+    while(dns_result[num] != NULL) { // 逐个释放
+        free(dns_result[num++]);
+    }
+}
+
+char** ipv4_dns_resolve(char *domain) { // DNS解析IPv4地址
+    char **result = init_dns_result();
+    char ip_str[16]; // IPv4地址字符串 (3 * 4 + 1 * 3 + 1)
+    struct sockaddr_in *ipv4_addr;
+    struct addrinfo *answer, hint, *p;
+    bzero(&hint, sizeof(hint)); // 清空为0x00
+    hint.ai_family = AF_INET;
+    hint.ai_socktype = SOCK_STREAM;
+    int ret = getaddrinfo(domain, NULL, &hint, &answer); // 发起解析
+    if (ret != 0) { // 解析失败
+        printf("[Shadowsocks Bootstrap] IPv4 DNS resolve `%s`: %s\n", domain, gai_strerror(ret));
+        return result; // 返回空数据
+    }
+    for (p = answer; p != NULL; p = p->ai_next) { // 遍历解析结果
+        ipv4_addr = (struct sockaddr_in*)(p->ai_addr); // 获取IPv4地址
+        inet_ntop(AF_INET, &ipv4_addr->sin_addr, ip_str, sizeof(ip_str)); // 转化为字符串形式
+        result = add_dns_result(result, ip_str);
+    }
+    freeaddrinfo(answer); // 释放解析结果
+    return result;
+}
+
+char** ipv6_dns_resolve(char *domain) { // DNS解析IPv6地址
+    char **result = init_dns_result();
+    char ip_str[40]; // IPv6地址字符串 (4 * 8 + 1 * 7 + 1)
+    struct sockaddr_in6 *ipv6_addr;
+    struct addrinfo *answer, hint, *p;
+    bzero(&hint, sizeof(hint)); // 清空为0x00
+    hint.ai_family = AF_INET6;
+    hint.ai_socktype = SOCK_STREAM;
+    int ret = getaddrinfo(domain, NULL, &hint, &answer); // 发起解析
+    if (ret != 0) { // 解析失败
+        printf("[Shadowsocks Bootstrap] IPv6 DNS resolve `%s`: %s\n", domain, gai_strerror(ret));
+        return result; // 返回空数据
+    }
+    for (p = answer; p != NULL; p = p->ai_next) { // 遍历解析结果
+        ipv6_addr = (struct sockaddr_in6*)(p->ai_addr); // 获取IPv6地址
+        inet_ntop(AF_INET6, &ipv6_addr->sin6_addr, ip_str, sizeof(ip_str)); // 转化为字符串形式
+        result = add_dns_result(result, ip_str);
+    }
+    freeaddrinfo(answer); // 释放解析结果
+    return result;
+}
+
+char* dns_resolve(char *domain) { // DNS解析 返回首个IP地址 IPv4优先
+    int num = 0;
+    char **result = init_dns_result();
+    result = ipv4_dns_resolve(domain); // IPv4解析
+    while(result[num++] != NULL); // num - 1 为IPv4地址数
+    if (num - 1 != 0) { // 存在IPv4解析
+        char *tmp = strcpy((char*)malloc(strlen(result[0]) + 1), result[0]);
+        free_dns_result(result); // 释放IPv4结果
+        return tmp; // 返回首个IPv4地址
+    }
+    free_dns_result(result); // 释放IPv4结果
+    result = ipv6_dns_resolve(domain);
+    num = 0;
+    while(result[num++] != NULL); // num - 1 为IPv6地址数
+    if (num - 1 == 0) { // 无IPv6解析
+        free_dns_result(result); // 释放IPv6结果
+        return NULL;
+    }
+    char *tmp = strcpy((char*)malloc(strlen(result[0]) + 1), result[0]);
+    free_dns_result(result); // 释放IPv6结果
+    return tmp; // 返回首个IPv6地址
+}