网络编程 单纯http客户端，服务器端

1，http客户端

2，http服务器端

http客户端：

#include <stdio.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <errno.h>

#include <netdb.h>

#include <string.h>

#include <unistd.h>

int main(int argc, char* argv[]){

  int err;

  int sock;

  char buf[32];

  char* deststr;

  addrinfo hints, *res0, *res;

  if(argc != 2){return 1;}

  deststr = argv[1];

  memset(&hints, 0, sizeof(hints));

  hints.ai_socktype = SOCK_STREAM;

  hints.ai_family = PF_UNSPEC;

  if((err = getaddrinfo(deststr, "http", &hints, &res0)) != 0){

    printf("error %d:%s\n", err, gai_strerror(err));

    return 1;

  }

  for(res = res0; res != NULL; res = res->ai_next){

    printf("%d\n", res->ai_family);

    sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);

    if(sock < 0){continue;}

    if(connect(sock, res->ai_addr, res->ai_addrlen) != 0){

      close(sock);

      continue;

    }

    break;

  }

  freeaddrinfo(res0);

  if(res == NULL){

    printf("failed\n");

    return 1;

  }

  snprintf(buf, sizeof(buf), "GET / HTTP/1.0\r\n\r\n");

  int n = write(sock, buf, (int)strlen(buf));

  while(n > 0){

    n = read(sock, buf, sizeof(buf));

    write(fileno(stdout), buf, n);

  }

  close(sock);

  return 0;

}

github源代码

发送端的执行方式：

./a.out www.baidu.com

http服务器端

#include <stdio.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <errno.h>

#include <netdb.h>

#include <string.h>

#include <unistd.h>

int main(){

  int sock0;

  sockaddr_in client;

  socklen_t len;

  int sock;

  int yes = 1;

  addrinfo *res, hints;

  int err;

  char buf[2048];

  int n;

  char inbuf[2048];

  hints.ai_family = AF_INET;

  hints.ai_flags = AI_PASSIVE;

  hints.ai_socktype = SOCK_STREAM;

  err = getaddrinfo(NULL, "12345", &hints, &res);

  if(err != 0){

    printf("getaddrinfo %s\n", gai_strerror(err));

    return 1;

  }

  sock0 = socket(res->ai_family, res->ai_socktype, 0);

  setsockopt(sock0, SOL_SOCKET, SO_REUSEADDR, (const char*)&yes, sizeof(yes));

  bind(sock0, res->ai_addr, res->ai_addrlen);

  listen(sock0, 5);

  snprintf(buf, sizeof(buf),

	   "HTTP/1.0 200 OK\r\n"

	   "Content-Length: 20\r\n"

	   "Content-Type:text/html\r\n"

	   "\r\n"

	   "HELLO\r\n");

  while(1){

    len = sizeof(client);

    sock = accept(sock0, (sockaddr*)&client, &len);

    n = read(sock, inbuf, sizeof(inbuf));

    write(fileno(stdout), inbuf, n);

    write(sock, buf, (int)strlen(buf));

    close(sock);

  }

  close(sock0);

  return 0;

}

github源代码

测试方式：

在浏览器里输入：http://127.0.0.1:12345

或者输入：http://localhost:12345

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