Linux c socket 实现http

最新推荐文章于 2025-02-21 15:39:59 发布

SilenceAlvin

最新推荐文章于 2025-02-21 15:39:59 发布

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分类专栏： linux c/c++

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本文展示了一个使用C语言进行网络编程的例子，包括了创建套接字、连接服务器、发送HTTP请求并接收响应的完整过程。

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#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
#define IPSTR "192.168.107.129"
#define PORT 80
#define BUFSIZE 1024
 
int main(int argc, char **argv)
{
        int sockfd, ret, i, h;
        struct sockaddr_in servaddr;
        char str1[4096], str2[4096], buf[BUFSIZE], *str;
        socklen_t len;
        fd_set   t_set1;
        struct timeval  tv;
        char *cmd;

        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) {
                printf("Socket Create error!\n");
                exit(0);
        };
 
        bzero(&servaddr, sizeof(servaddr));
        servaddr.sin_family = AF_INET;
        servaddr.sin_port = htons(PORT);
        if (inet_pton(AF_INET, IPSTR, &servaddr.sin_addr) <= 0 ){
                printf("inet_pton error!\n");
                exit(0);
        };
 
        if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){
                printf("Socket connect error!\n");
                exit(0);
        }
        printf("Socket connect success\n");
 
        //发送数据
        memset(str2, 0, 4096);
        strcat(str2, "name=songzy");
        str=(char *)malloc(128);
        len = strlen(str2);
        sprintf(str, "%d", len);
 
        memset(str1, 0, 4096);
        strcat(str1, "PUT /rest/index.php/api/users/7 HTTP/1.1\n");
        strcat(str1, "Host: 192.168.107.129\n");
        strcat(str1, "Content-Type: application/x-www-form-urlencoded\n");
        strcat(str1, "Content-Length: ");
        strcat(str1, str);
        strcat(str1, "\n\n");
 
        strcat(str1, str2);
        strcat(str1, "\r\n\r\n");
        printf("%s\n",str1);
 
        ret = write(sockfd,str1,strlen(str1));
        if (ret < 0) {
                printf("Send filed ! Error Code is %d，Error is '%s'\n",errno, strerror(errno));
                exit(0);
        }else{
                printf("Send Success，Has Send%dbite！\n\n", ret);
        }
 
        FD_ZERO(&t_set1);
        FD_SET(sockfd, &t_set1);
 
        while(1){
                sleep(2);
                tv.tv_sec= 0;
                tv.tv_usec= 0;
                h= 0;
                printf("--------------->1");
                h= select(sockfd +1, &t_set1, NULL, NULL, &tv);
                printf("--------------->2");
 
                //if (h == 0) continue;
                if (h < 0) {
                        close(sockfd);
                        printf("Select Error！\n");
                        return -1;
                };
 
                if (h > 0){
                        memset(buf, 0, 4096);
                        i= read(sockfd, buf, 4095);
                        if (i==0){
                                close(sockfd);
                                printf("Read finished\n");
                                return -1;
                        }
 
                        printf("%s\n", buf);
                }
        }
        close(sockfd);
 
 
        return 0;
}