之前介绍了网络字节序 。网络编程之网络字节序详解
今天就来实现一下简单的网络程序 。
先看几个函数
【C语言进行Linux网络编程】// 创建socket套接字int socket(int domain, int type, int protocol);// 绑定服务器地址int bind(int sockfd, const struct sockaddr *addr,socklen_t addrlen);// 接收连接int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);// 连接服务器int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);服务器端程序：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <arpa/inet.h>#include <sys/socket.h>typedef struct _MSG { int id; short length; short reserve; char content[100];} MSG;int main(int argc, char *argv[]){ int serv_sock; int clnt_sock; struct sockaddr_in serv_addr; struct sockaddr_in clnt_addr; socklen_t clnt_addr_size; char message[] = "Hello world!"; if (argc != 2) {printf("Usage: %s <port>n", argv[0]);return -1; } serv_sock = socket(AF_INET, SOCK_STREAM, 0); if (serv_sock == -1) {printf("socket errorn");return -1; } memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; // 转换为网络字节序 ， INADDR_ANY表示绑定本机所有ip地址 serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); // 将端口转换为网络字节序 serv_addr.sin_port = htons(atoi(argv[1])); if (bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1) {printf("bind errorn");return -1; } if (listen(serv_sock, 5) == -1) {printf("listen errorn");return -1; } clnt_addr_size = sizeof(clnt_addr); clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_addr, &clnt_addr_size); if (clnt_sock == -1) {printf("accept errorn"); } for (int i = 0; i < 10; i++) {MSG msg;msg.id = htonl(i);msg.length = htons(strlen("hello world"));msg.reserve = htons(0);strcpy(msg.content, "hello world");write(clnt_sock, (char *)&msg, sizeof(MSG)); } close(clnt_sock); close(serv_sock); return 0;}客户端程序：
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <arpa/inet.h>#include <sys/socket.h>typedef struct _MSG { int id; short length; short reserve; char content[100];} MSG;int main(int argc, char *argv[]){ int sock; struct sockaddr_in serv_addr; int str_len; if (argc != 3) {printf("Usage: %s <IP> <port>n", argv[0]);return -1; } sock = socket(AF_INET, SOCK_STREAM, 0); if (sock == -1) {printf("socket errorn");return -1; } memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr(argv[1]); serv_addr.sin_port = htons(atoi(argv[2])); if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1) {printf("connect errorn");return -1; } for (;;) {MSG msg;str_len = read(sock, &msg, sizeof(msg));if (str_len <= 0) {printf("read errorn");break;}msg.id = ntohl(msg.id);msg.length = ntohs(msg.length);printf ("msg(id, length, content): %3d, %3d, %sn", msg.id, msg.length, msg.content); } close(sock); return 0;}运行效果如下
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