简单的IPv6 UDP/TCP socket编程 -- 两台Linux实现简单的ipv6通信

配置：

1.两台linux用网线直接相连

2.手动配置两台linux的ipv6地址为：

ifconfig eth0 add 2001:da8:e000::1:1:1

ifconfig eth0 add 2001:da8:e000::1:1:2

如下所示：

[root@EmbedSky /]# ifconfig

eth0      Link encap:Ethernet  HWaddr 10:23:45:67:89:AB  

          inet addr:192.168.142.21  Bcast:192.168.142.255  Mask:255.255.255.0

          inet6 addr: 2001:da8:e000::1:1:1/0 Scope:Global       //手动添加的地址

          inet6 addr: fe80::1223:45ff:fe67:89ab/64 Scope:Link //ipv6中的Link地址相当于ipv中169...私有地址

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:339 errors:0 dropped:0 overruns:0 frame:0

          TX packets:141 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:39003 (38.0 KiB)  TX bytes:9530 (9.3 KiB)

          Interrupt:51 Base address:0x4000 

3.接下来用ping6地址来测试：

[root@EmbedSky /]# ping6 2001:da8:e000::1:1:2

PING 2001:da8:e000::1:1:2 (2001:da8:e000::1:1:2): 56 data bytes

64 bytes from 2001:da8:e000::1:1:2: seq=0 ttl=64 time=4.788 ms

64 bytes from 2001:da8:e000::1:1:2: seq=1 ttl=64 time=1.268 ms
4.wireshark工具抓包可得：

网络编程

具体的编程细节不解释了，代码测试通过......

UDP通信

server端：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>

int main(int argc, char **argv)
{
struct sockaddr_in6 s_addr;
struct sockaddr_in6 c_addr;
int sock;
socklen_t addr_len;
int len;
char buff[128];
char buf_ip[128];

if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
perror("socket");
exit(errno);
} else
printf("create socket.\n\r");

memset(&s_addr, 0, sizeof(struct sockaddr_in6));
s_addr.sin6_family = AF_INET6;

if (argv[2])
s_addr.sin6_port = htons(atoi(argv[2]));
else
s_addr.sin6_port = htons(4444);

if (argv[1])
inet_pton(AF_INET6, argv[1], &s_addr.sin6_addr);
else
s_addr.sin6_addr = in6addr_any;

if ((bind(sock, (struct sockaddr *) &s_addr, sizeof(s_addr))) == -1) {
perror("bind");
exit(errno);
} else
printf("bind address to socket.\n\r");

addr_len = sizeof(c_addr);
while (1) {
len = recvfrom(sock, buff, sizeof(buff) - 1, 0,
(struct sockaddr *) &c_addr, &addr_len);
if (len < 0) {
perror("recvfrom");
exit(errno);
}

buff[len] = '\0';
printf("receive from %s: buffer:%s\n\r",
inet_ntop(AF_INET6, &c_addr.sin6_addr, buf_ip, sizeof(buf_ip)),
buff);
}
return 0;
}

client端：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>

int main(int argc, char **argv)
{
struct sockaddr_in6 s_addr;
int sock;
int addr_len;
int len;
char buff[128];

if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
perror("socket");
exit(errno);
} else
printf("create socket.\n\r");

s_addr.sin6_family = AF_INET6;
if (argv[2])
s_addr.sin6_port = htons(atoi(argv[2]));
else
s_addr.sin6_port = htons(4444);

if (argv[1])
inet_pton(AF_INET6, argv[1], &s_addr.sin6_addr);
else {
printf("usage:./command ip port\n");
exit(0);
}

addr_len = sizeof(s_addr);
strcpy(buff, "hello i'm here");
len = sendto(sock, buff, strlen(buff), 0,
(struct sockaddr *) &s_addr, addr_len);
if (len < 0) {
printf("\n\rsend error.\n\r");
return 3;
}

printf("send success.\n\r");
return 0;
}

测试如下：

server端：

[root@zx bacnet-router]# ./server 2001:da8:e000::1:1:2 4444
create socket.
bind address to socket.
receive from 2001:da8:e000::1:1:1: buffer:hello i'm here
receive from 2001:da8:e000::1:1:1: buffer:hello i'm here
receive from 2001:da8:e000::1:1:2: buffer:hello i'm here
receive from 2001:da8:e000::1:1:2: buffer:hello i'm here

client端：

[root@zx bacnet-router]# ./client 2001:da8:e000::1:1:2 4444
create socket.
send success.
[root@zx bacnet-router]# ./client 2001:da8:e000::1:1:2 4444
create socket.
send success.
[root@zx bacnet-router]#

[root@EmbedSky /bacnet-router]# ./arm-client 2001:da8:e000::1:1:2 4444
create socket.
send success.
[root@EmbedSky /bacnet-router]# ./arm-client 2001:da8:e000::1:1:2 4444
create socket.
send success.
[root@EmbedSky /bacnet-router]#

TCP通信：

server端：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>

#define MAXBUF 1024

int main(int argc, char **argv)
{
int sockfd, new_fd;
socklen_t len;

/* struct sockaddr_in my_addr, their_addr; */ // IPv4
struct sockaddr_in6 my_addr, their_addr; // IPv6

unsigned int myport, lisnum;
char buf[MAXBUF + 1];

if (argv[1])
myport = atoi(argv[1]);
else
myport = 7838;

if (argv[2])
lisnum = atoi(argv[2]);
else
lisnum = 2;

/* if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) { */ // IPv4
if ((sockfd = socket(PF_INET6, SOCK_STREAM, 0)) == -1) { // IPv6
perror("socket");
exit(1);
} else
printf("socket created\n");

bzero(&my_addr, sizeof(my_addr));
/* my_addr.sin_family = PF_INET; */ // IPv4
my_addr.sin6_family = PF_INET6;    // IPv6
/* my_addr.sin_port = htons(myport); */ // IPv4
my_addr.sin6_port = htons(myport);   // IPv6
if (argv[3])
/* my_addr.sin_addr.s_addr = inet_addr(argv[3]); */ // IPv4
inet_pton(AF_INET6, argv[3], &my_addr.sin6_addr);  // IPv6
else
/* my_addr.sin_addr.s_addr = INADDR_ANY; */ // IPv4
my_addr.sin6_addr = in6addr_any;            // IPv6

/* if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr)) */ // IPv4
if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr_in6))  // IPv6
== -1) {
perror("bind");
exit(1);
} else
printf("binded\n");

if (listen(sockfd, lisnum) == -1) {
perror("listen");
exit(1);
} else
printf("begin listen\n");

while (1) {
len = sizeof(struct sockaddr);
if ((new_fd =
accept(sockfd, (struct sockaddr *) &their_addr,
&len)) == -1) {
perror("accept");
exit(errno);
} else
printf("server: got connection from %s, port %d, socket %d\n",
/* inet_ntoa(their_addr.sin_addr), */ // IPv4
inet_ntop(AF_INET6, &their_addr.sin6_addr, buf, sizeof(buf)), // IPv6
/* ntohs(their_addr.sin_port), new_fd); */ // IPv4
their_addr.sin6_port, new_fd); // IPv6

bzero(buf, MAXBUF + 1);
strcpy(buf, "This is sever to client!\n");
len = send(new_fd, buf, strlen(buf), 0);
if (len < 0) {
printf
("message '%s' error number:%d，error mes:'%s'\n", buf, errno, strerror(errno));
} else
printf("message'%s'success length: %d\n", buf, len);

bzero(buf, MAXBUF + 1);
len = recv(new_fd, buf, MAXBUF, 0);
if (len > 0)
printf("receive message:'%s'，length:%d\n", buf, len);
else
printf
("message error number:%d，error mes:'%s'\n", errno, strerror(errno));
}

close(sockfd);
return 0;
}

client端：

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define MAXBUF 1024

int main(int argc, char **argv)
{
int sockfd, len;
/* struct sockaddr_in dest; */ // IPv4
struct sockaddr_in6 dest;      // IPv6
char buffer[MAXBUF + 1];

if (argc != 3) {
printf
("参数格式错误！正确用法如下：\n\t\t%s IP地址 端口\n\t比如:\t%s 127.0.0.1 80\n此程序用来从某个 IP 地址的服务器某个端口接收最多 MAXBUF 个字节的消息",
argv[0], argv[0]);
exit(0);
}
/* socket for tcp */
/* if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { */ // IPv4
if ((sockfd = socket(AF_INET6, SOCK_STREAM, 0)) < 0) {      // IPv6
perror("Socket");
exit(errno);
}
printf("socket created\n");

/* 初始化服务器端（对方）的地址和端口信息 */
bzero(&dest, sizeof(dest));
/* dest.sin_family = AF_INET; */  // IPv4
dest.sin6_family = AF_INET6;     // IPv6
/* dest.sin_port = htons(atoi(argv[2])); */ // IPv4
dest.sin6_port = htons(atoi(argv[2]));     // IPv6
/* if (inet_aton(argv[1], (struct in_addr *) &dest.sin_addr.s_addr) == 0) { */ // IPv4
if ( inet_pton(AF_INET6, argv[1], &dest.sin6_addr) < 0 ) {                 // IPv6
perror(argv[1]);
exit(errno);
}
printf("address created\n");

/* 连接服务器 */
if (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)) != 0) {
perror("Connect ");
exit(errno);
}
printf("server connected\n");

/* 接收对方发过来的消息，最多接收 MAXBUF 个字节 */
bzero(buffer, MAXBUF + 1);
/* 接收服务器来的消息 */
len = recv(sockfd, buffer, MAXBUF, 0);
if (len > 0)
printf("接收消息成功:'%s'，共%d个字节的数据\n",
buffer, len);
else
printf
("消息接收失败！错误代码是%d，错误信息是'%s'\n",
errno, strerror(errno));

bzero(buffer, MAXBUF + 1);
strcpy(buffer, "这是客户端发给服务器端的消息\n");
/* 发消息给服务器 */
len = send(sockfd, buffer, strlen(buffer), 0);
if (len < 0)
printf
("消息'%s'发送失败！错误代码是%d，错误信息是'%s'\n",
buffer, errno, strerror(errno));
else
printf("消息'%s'发送成功，共发送了%d个字节！\n",
buffer, len);

/* 关闭连接 */
close(sockfd);
return 0;
}