inet_ntoa->inet_ntop, inet_addr->inet_pton

N-Nicole · Aug 4, 2015 · 0c714bc · 0c714bc
1 parent ec89537
commit 0c714bc
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Showing 4 changed files with 61 additions and 7 deletions.
diff --git a/example/UDPclient.cpp b/example/UDPclient.cpp
@@ -8,11 +8,18 @@
 int main()
 {
 	int cli_sock = socket(AF_INET, SOCK_DGRAM, 0);
+
 	//conn_addr 是要连接的服务器地址结构
 	struct sockaddr_in conn_addr;
 	conn_addr.sin_family = AF_INET;
 	conn_addr.sin_port = htons(8345);
-	conn_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+	//conn_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+	//将 inet_addr() 改用 inet_pton() 这个现代的方法，支持 IPV4 和 IPV6
+	if (inet_pton(AF_INET, "127.0.0.1", &conn_addr.sin_addr) == -1) {
+		printf("inet_pton error\n");
+		close(cli_sock);
+		return 0;
+	}
 
 	//serv_addr 是用来存储 recvfrom 中的地址结构
 	struct sockaddr_in serv_addr;
@@ -27,9 +34,19 @@ int main()
 		int n = recvfrom(cli_sock, buf, sizeof(buf), 0,
 						 (struct sockaddr*)&serv_addr,
 						 &serv_addr_len );
+
 		if (n > 0) {
-			num++;
-			printf("recv data from %s : %d  %c\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port), buf[0]);
+			num++;			
+			//将 inet_ntoa() 改用 inet_ntop() 这个现代方法，支持 IPV4 和 IPV6
+			//printf("recv data from %s : %d  %c\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port), buf[0]);
+			//INET_ADDRSTRLEN 是标识 IPV4 地址展现字符串的大小常量,INET6_ADDRSTRLEN是 IPV6 的
+			char serv_ip[INET_ADDRSTRLEN];
+			if (inet_ntop(AF_INET, &serv_addr.sin_addr, serv_ip, sizeof(serv_ip)) == NULL) {
+				printf("inet_ntop error\n");
+				close(cli_sock);
+				return 0;
+			}
+			printf("recv data from %s : %d  %c\n", serv_ip, ntohs(serv_addr.sin_port), buf[0]);
 		}
 		++c;
 	}

diff --git a/example/UDPserver.cpp b/example/UDPserver.cpp
@@ -8,12 +8,23 @@
 int main()
 {
 	int serv_sock = socket(AF_INET, SOCK_DGRAM, 0);
+
 	//服务端自己的地址结构
 	struct sockaddr_in serv_addr;
 	serv_addr.sin_family = AF_INET;
 	serv_addr.sin_port = htons(8345);
 	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-	printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
+
+	//将 inet_ntoa() 改用 inet_ntop() 这个现代方法，支持 IPV4 和 IPV6
+	//printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
+	//INET_ADDRSTRLEN 是标识 IPV4 地址展现字符串的大小常量,INET6_ADDRSTRLEN是 IPV6 的
+	char serv_ip[INET_ADDRSTRLEN];
+	if (inet_ntop(AF_INET, &serv_addr.sin_addr, serv_ip, sizeof(serv_ip)) == NULL) {
+		printf("inet_ntop error\n");
+		close(serv_sock);
+		return 0;
+	}
+	printf("bind in %s : %d\n", serv_ip, ntohs(serv_addr.sin_port));
 
 	if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
 		printf("bind error\n");

diff --git a/example/echoclient.cpp b/example/echoclient.cpp
@@ -12,9 +12,25 @@ int main()
 
 	struct sockaddr_in serv_addr;
 	serv_addr.sin_family = AF_INET;
-	serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 	serv_addr.sin_port = htons(8123);
-	printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
+	//serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+	//将 inet_addr() 改用 inet_pton() 这个现代的方法，支持 IPV4 和 IPV6
+	if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) == -1) {
+		printf("inet_pton error\n");
+		close(cli_sock);
+		return 0;
+	}
+
+	//将 inet_ntoa() 改用 inet_ntop() 这个现代方法，支持 IPV4 和 IPV6
+	//printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
+	//INET_ADDRSTRLEN 是标识 IPV4 地址展现字符串的大小常量,INET6_ADDRSTRLEN是 IPV6 的
+	char serv_ip[INET_ADDRSTRLEN]; 
+	if (inet_ntop(AF_INET, &serv_addr.sin_addr, serv_ip, sizeof(serv_ip)) == NULL) {
+		printf("inet_ntop error\n");
+		close(cli_sock);
+		return 0;
+	}
+	printf("bind in %s : %d\n", serv_ip, ntohs(serv_addr.sin_port));
 
 	int conn = connect(cli_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
 	if (conn == -1) {

diff --git a/example/echoserver.cpp b/example/echoserver.cpp
@@ -18,8 +18,18 @@ int main()
 	serv_addr.sin_family = AF_INET;
 	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
 	serv_addr.sin_port = htons(8123);
-	printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
 
+	//将 inet_ntoa() 改用 inet_ntop() 这个现代方法，支持 IPV4 和 IPV6
+	//printf("bind in %s : %d\n", inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
+	//INET_ADDRSTRLEN 是标识 IPV4 地址展现字符串的大小常量,INET6_ADDRSTRLEN是 IPV6 的
+	char serv_ip[INET_ADDRSTRLEN];
+	if (inet_ntop(AF_INET, &serv_addr.sin_addr, serv_ip, sizeof(serv_ip)) == NULL) {
+		printf("inet_ntop error\n");
+		close(server_sock);
+		return 0;
+	}
+
+	printf("bind in %s : %d\n", serv_ip, ntohs(serv_addr.sin_port));
 	if (bind(server_sock, (struct sockaddr*)&serv_addr, serv_addr_len) < 0) {
 		printf("bind error\n");
 		return 0;