socket实现最最最简单的http请求的数据

来源：互联网发布：陕西天互数据编辑：程序博客网时间：2024/05/22 16:24
/* For sockaddr_in */#include <netinet/in.h>/* For socket functions */#include <sys/socket.h>/* For gethostbyname */#include <netdb.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <stdio.h>int main(int argc, char *argv[]){if(argc != 2){printf("parameter error!\n");return -1;}char query[1024];memset(query, 0x00,sizeof(query));snprintf(query, sizeof(query), "GET / HTTP/1.0\r\n""%s\r\n""\r\n",argv[1]);printf("query = %s\n",query);char hostname[128];memset(hostname, 0x00,sizeof(hostname));strcpy(hostname, argv[1]);struct sockaddr_in sin;struct hostent *h;const char *cp;int fd;ssize_t n_written, remaining;char buf[1024];/* Look up the IP address for the hostname.   Watch out; this isn't   threadsafe on most platforms. */h = gethostbyname(hostname);if (!h) {fprintf(stderr, "Couldn't lookup %s: %s", hostname, hstrerror(h_errno));return 1;}if (h->h_addrtype != AF_INET) {fprintf(stderr, "No ipv6 support, sorry.");return 1;}    /* Write the query. *//* XXX Can send succeed partially? */cp = query;remaining = strlen(query);fd = socket(AF_INET,SOCK_STREAM,0);struct sockaddr_in srvaddr;srvaddr.sin_family = AF_INET;srvaddr.sin_port = htons(80);char ip[128];memset(ip, 0x00,sizeof(ip));inet_ntop(h->h_addrtype, *(h->h_addr_list), ip, sizeof(ip));printf("ip = %s\n",ip);srvaddr.sin_addr.s_addr = inet_addr(ip);        //srvaddr.sin_addr = *(struct in_addr*)h->h_addr;if (connect(fd, (struct sockaddr*) (&srvaddr), sizeof(srvaddr)) < 0) {perror("fun socket:");exit(0);}while (remaining) {  n_written = send(fd, cp, remaining, 0);  if (n_written <= 0) {perror("send");return 1;  }  remaining -= n_written;  cp += n_written;}/* Get an answer back. */while (1) {ssize_t result = recv(fd, buf, sizeof(buf), 0);if (result == 0) {break;} else if (result < 0) {perror("recv");close(fd);return 1;}fwrite(buf, 1, result, stdout);}close(fd);return 0;}
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