ipv6 socket编程实践
Table of Contents
- 1. ipv6 socket编程实践
- 2. 示例程序
ipv6 socket编程实践
- ip地址长度变化，按照ipv4 255.255.255.255的地址格式，最长为15，加上结束符16字节长度；ipv6
的地址格式为XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX，最长为39，加上结束符为40字节长度。 - struct sockaddr变化为struct sockaddr_storage
这个结构体变化在getpeername和getsockname两个函数中使用，虽然manual中给出的入参类型还是
struct sockaddr,但是在ipv6中，需要使用struct sockaddr_storage struct sockaddr_in变化为struct sockaddr_in6
在inet_*函数中使用，如:- sin_addr –> sin6_addr
inet_ntop(AF_INET6, &sock_addr_in6.sin6_addr, peerAddrV6, sizeof(peerAddrV6)); */ ipv6
peerAddr = (UINT8 *)inet_ntoa(sock_addr_in.sin_addr); /* ipv4 - sin_port –> sin6_port
fromV6.sin6_port = htons(TcpLinkCB[dwIndex].lPort); */ ipv6
from.sin_port = htons(TcpLinkCB[dwIndex].lPort); /* ipv4
- sin_addr –> sin6_addr
inet_addr –> inet_pton
TcpLinkCB[dwIndex].dwIPAddr = inet_addr(tmp); */ ipv4
inet_pton(AF_INET6, tmp, &TcpLinkCB[dwIndex].in6peerIPAddr); /* ipv6- socket入参变化 AF_INET –> AF_INET6
skt = socket(AF_INET6, SOCK_STREAM, 0); */ ipv6
skt = socket(AF_INET, SOCK_STREAM, 0); /* ipv4
also: PF_INET –> PF_INET6 - bind函数入参变化
bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr)) –>
bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr_in6) INADDR_ANY –> in6addr_any
struct sockaddr_in sa;
struct sockaddr_in6 sa6;sa.sin_addr.s_addr = INADDR_ANY; */ use my IPv4 address
sa6.sin6_addr = in6addr_any; /* use my IPv6 addressfromV6.sin6_family = AF_INET6; */ ipv6
from.sin_family = AF_INET; /* ipv4- struct in6_addr可以使用IN6ADDR_ANY_INIT初始化
struct in6_addr ia6 = IN6ADDR_ANY_INIT;
示例程序
ipv6
ipv6 tcp server
#include#include #include #include #include #include #include #include #include #include #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 /* 开始处理每个新连接上的数据收发 */ bzero(buf, MAXBUF + 1); strcpy(buf, "这是在连接建立成功后向客户端发送的第一个消息/n只能向new_fd这个用accept函数新建立的socket发消息，不能向sockfd这个监听socket发送消息，监听socket不能用来接收或发送消息/n"); /* 发消息给客户端 */ len = send(new_fd, buf, strlen(buf), 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", buf, errno, strerror(errno)); } else printf("消息'%s'发送成功，共发送了%d个字节！/n", buf, len); bzero(buf, MAXBUF + 1); /* 接收客户端的消息 */ len = recv(new_fd, buf, MAXBUF, 0); if (len > 0) printf("接收消息成功:'%s'，共%d个字节的数据/n", buf, 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)); /* 处理每个新连接上的数据收发结束 */ } close(sockfd); return 0; } ipv6 tcp client
#include#include #include #include #include #include #include #include #include #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); } /* 创建一个 socket 用于 tcp 通信 */ /* 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; } 编译命令: gcc -o server ./server.c
gcc -o client ./client.c
启动命令: ./server port backlog ip_addr
./client ip_addr portipv6 udp server
#include#include #include #include #include #define LOCALPORT 8888 int main(int argc,char *argv[]) { int mysocket,len; int i=0; struct sockaddr_in6 addr; int addr_len; char msg[200]; char buf[300]; if((mysocket=socket(AF_INET6,SOCK_DGRAM,0))<0) { perror("error:"); return(1); } else { printf("socket created ...\n"); printf("socket id :%d \n",mysocket); } addr_len=sizeof(struct sockaddr_in6); bzero(&addr,sizeof(addr)); addr.sin6_family=AF_INET6; addr.sin6_port=htons(LOCALPORT); addr.sin6_addr=in6addr_any; if(bind(mysocket,(struct sockaddr *)&addr,sizeof(addr))<0) { perror("connect"); return(1); } else { printf("bink ok .\n"); printf("local port : %d\n",LOCALPORT); } while(1) { bzero(msg,sizeof(msg)); len = recvfrom(mysocket,msg,sizeof(msg),0,(struct sockaddr *)&addr,(socklen_t*)&addr_len); printf("%d:",i); i++; inet_ntop(AF_INET6,&addr.sin6_addr,buf,sizeof(buf)); printf("message from ip %s",buf); printf("Received message : %s\n",msg); if(sendto(mysocket,msg,len,0,(struct sockaddr *)&addr,addr_len)<0) { printf("error"); return(1); } } } ipv6 udp client
#include#include #include #include #include #define REMOTEPORT 8888 #define REMOTEIP "::1" int main(int argc,char *argv[]) { int mysocket,len; int i=0; struct sockaddr_in6 addr; int addr_len; char msg[200]; if((mysocket=socket(AF_INET6,SOCK_DGRAM,0))< 0) { perror("error:"); return(1); } else { printf("socket created ...\n"); printf("socket id :%d \n",mysocket); printf("rmote ip : %s\n",REMOTEIP); printf("remote port :%d \n",REMOTEPORT); } addr_len=sizeof(struct sockaddr_in6); bzero(&addr,sizeof(addr)); addr.sin6_family=AF_INET6; addr.sin6_port=htons(REMOTEPORT); inet_pton(AF_INET6,REMOTEIP,&addr.sin6_addr); while(1) { bzero(msg,sizeof(msg)); len=read(STDIN_FILENO,msg,sizeof(msg)); if(sendto(mysocket,msg,sizeof(msg),0,(struct sockaddr *)&addr,addr_len)<0) { printf("error"); return(1); } len=recvfrom(mysocket,msg,sizeof(msg),0,(struct sockaddr *)&addr,(socklen_t*)&addr_len); printf("%d:",i); i++; printf("Received message : %s\n",msg); } }
- ref: 示例程序来源