网络套接字编程学习笔记二

首先分析http协议的报头数据

   1: GET /index.html HTTP/1.1
   2: Host: localhost:8000
   3: User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0.1) Gecko/20100101 Firefox/10.0.1
   4: Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
   5: Accept-Language: en-us,en;q=0.5
   6: Accept-Encoding: gzip, deflate
   7: Connection: keep-alive

 

得到第一行数据GET /index.html /HTTP/1.1

建立一个简单的web程序，大致流程与笔记一种类型

直接贴代码了

服务端代码：

   1: /**
   2: ** web_server.c
   3: ** copyright Xu Dongdong 2013.5.9  Open Source Software License.
   4: */
   5:  
   6: #include <stdio.h>
   7: #include <stdlib.h> /*exit */
   8: #include <string.h> /*memset*/
   9: #include <sys/socket.h>
  10: #include <netinet/in.h>
  11: #include <arpa/inet.h>
  12: #include <netdb.h>
  13: #include <errno.h>
  14:  
  15: unsigned short int port = 8000;
  16:  
  17: char *error_return  = "<html> \n <body> File bnot found </body> </html>" ;
  18: char ret_buf[32768];
  19: char *read_file(char * buf ,int num_buf);
  20:  
  21: int main (int argc ,char*argv[])
  22: {
  23:     
  24:     char * recvBuffer = (char * )malloc(4001);
  25:  
  26:     int rc;
  27:  
  28:     struct sockaddr_in serv_addr;
  29:     struct sockaddr_in cli_addr;
  30:  
  31:     int sockfd;
  32:     struct hostent* entity; 
  33:     int total_recv, total_sent,bytes_sent,total_size,size;
  34:     int sockfd_tmp;
  35:     int addr_size;
  36:  
  37:     char *buf;
  38:     int i,len;
  39:  
  40:     sockfd = socket(AF_INET, SOCK_STREAM,0);
  41:     if(sockfd == -1)
  42:     {
  43:         perror("call to socket error");
  44:         exit(1);
  45:     }
  46:     memset(&serv_addr,'\0',sizeof(serv_addr));
  47:     serv_addr.sin_family = AF_INET;
  48:     serv_addr.sin_addr.s_addr= htonl(INADDR_ANY);
  49:     serv_addr.sin_port = htons(port);
  50:  
  51:  
  52:     if(bind(sockfd,(struct sockaddr *)&serv_addr ,sizeof(serv_addr)) == -1)
  53:     {
  54:         perror("call to bind error");
  55:         exit(1);
  56:     }
  57:  
  58:     if(listen(sockfd,20) == -1)
  59:     {
  60:         perror("call to listen error");
  61:         exit(1);
  62:     }
  63:  
  64:     printf("Accepting connections ......\n");
  65:  
  66:     while(1)
  67:     {
  68:         rc = sizeof(struct sockaddr_in);
  69:         do{
  70:             sockfd_tmp =  accept(sockfd,(struct sockaddr*)&cli_addr,&rc);
  71:         }while( sockfd_tmp == -1  && errno == EINTR);
  72:         if(sockfd_tmp == -1)
  73:         {
  74:             perror("call to accept error");
  75:             exit(1);
  76:         }
  77:  
  78:         entity = gethostbyaddr((char*)&cli_addr.sin_addr ,sizeof (struct in_addr),AF_INET);
  79:         i =  recv(sockfd_tmp,recvBuffer,4000,0) ;
  80:         if(i == -1) 
  81:         {
  82:             perror("call to recv error");
  83:             break;
  84:         }
  85:         if(recvBuffer[i-1]  != '\n') break;
  86:         recvBuffer[i] = '\0' ;
  87:     
  88:         printf("receive from client:%s\n",recvBuffer);
  89:  
  90:         buf = read_file(recvBuffer, total_recv);
  91:         size = strlen(buf);
  92:         total_sent = 0;
  93:  
  94:         do{
  95:             bytes_sent = send(sockfd_tmp ,buf+total_sent, strlen(buf + total_sent) ,0);
  96:             if(bytes_sent == -1)
  97:             {
  98:                 break;
  99:             }
 100:             total_sent += bytes_sent;
 101:         }while(total_size < size) ;
 102:  
 103:         close(sockfd_tmp);
 104:     }
 105:  
 106:     return EXIT_SUCCESS;
 107: }
 108:  
 109: char* read_file(char * buf ,int num_buf)
 110: {
 111:     int i ;
 112:     char * cp,  *cp2 ;
 113:     FILE * file;
 114:     cp =buf +5 ;
 115:     cp2 = strstr(cp ," HTTP");
 116:     if(cp2 != NULL )
 117:     {
 118:         *cp2 = '\0' ;
 119:     }
 120:  
 121:     file = fopen(cp ,"r");
 122:     if(file == NULL )
 123:     {
 124:         return error_return;
 125:     }
 126:     i= fread(ret_buf ,1 ,32768 ,file);
 127:  
 128:     if(i==0)
 129:     {
 130:         fclose(file);
 131:         return error_return;
 132:     }
 133:  
 134:     ret_buf[i] = '\0';
 135:     fclose(file);
 136:     return ret_buf;
 137: }

 

客户端代码：

   1: /**
   2: ** client.c
   3: ** copyright Xu Dongdong 2013.5.9  Open Source Software License.
   4: */
   5:  
   6: #include <stdio.h>
   7: #include <stdlib.h>
   8: #include <string.h>
   9:  
  10: #include <sys/socket.h>
  11: #include <netinet/in.h>
  12: #include <arpa/inet.h>
  13: #include <netdb.h>
  14:  
  15: char * host_name = "127.0.0.1"; //local host
  16: unsigned int port = 8000 ;
  17:  
  18: int main (int argc ,char*argv[])
  19: {
  20:     char buf[8192];
  21:     char message[256];
  22:  
  23:     struct sockaddr_in cli_addr;
  24:  
  25:     int sockfd;
  26:     struct hostent *serv_host_name;
  27:  
  28:  
  29:     if((serv_host_name = gethostbyname(host_name)) ==0)
  30:     {
  31:         perror("Error resolving local host \n");
  32:         exit(1);
  33:     }
  34:  
  35:  
  36:     sockfd = socket(AF_INET, SOCK_STREAM,0);
  37:     if(sockfd == -1)
  38:     {
  39:         perror("call to socket error");
  40:         exit(1);
  41:     }
  42:  
  43:     memset(&cli_addr,'\0',sizeof(cli_addr));
  44:     cli_addr.sin_family = AF_INET;
  45:     cli_addr.sin_addr.s_addr= htonl(INADDR_ANY);
  46:     cli_addr.sin_addr.s_addr = (( ( struct in_addr *)(serv_host_name -> h_addr) )-> s_addr);
  47:     cli_addr.sin_port = htons(port);;
  48:  
  49:     if(connect(sockfd,(void *)&cli_addr ,sizeof(cli_addr)) == -1)
  50:     {
  51:         perror("call to connet to socket ");
  52:         exit(1);
  53:     }
  54:  
  55:     sprintf(message,"GET /index.html HTTP/1.1 \n");
  56:     printf("Sending message  %s to web_server ... \n", message);
  57:  
  58:     if(send(sockfd,message,strlen(message), 0) == -1)
  59:         {
  60:               printf("call to send error");
  61:               exit(1);
  62:         }
  63:  
  64:         printf("...sent message...wait for response \n");
  65:  
  66:         if(recv(sockfd,buf,8192,0) == -1)
  67:         {
  68:               perror("error in receiving response from server ");
  69:               exit(1);
  70:         }
  71:         printf("Respnse from server:%s\n",buf);
  72:  
  73:         close(sockfd);
  74:     }
  75: 

直接使用gcc编译运行即可

可以使用浏览器作为客户端进行访问，具体的url为： http://localhost:8000/index.html

 

作为实例我们给出最简单你的html代码 index.html

   1: <html>
   2: <head>
   3: </head>
   4: <body>
   5: index.html
   6: </body>
   7: </html>
posted @ 2013-05-10 13:31  远东悟语  阅读(1370)  评论(0)  编辑  收藏  举报

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