使用socket编写pop3客户端

1、项目分析设计文档使用socket编写pop3客户端课程名称基础实践专 业计科班 级学 号姓 名11111撰写时间： 2015 年 9 月 9 日【项目构思】使用socket编写pop3客户端【项目设计】#include #include#include#include#pragma comment(lib,ws2_32.lib)#define MAX_SIZE 128 /定义可以接收的最大字符串长度main(int argc, char *argv)/变量声明WSADATA wsaData;int sock;char hostName128; /服务器IPstruct hostent* pHo

2、st; struct sockaddr_in servAddr; /服务器端地址int byteRcvd; /recv函数接收到的字节数char respondFromServerMAX_SIZE; char resStringMAX_SIZE; char commandMAX_SIZE;char mailBufMAX_SIZE;int i;/加载Winsock DLLif(WSAStartup(MAKEWORD(2,2),&wsaData)!=0)printf(初始化winsock失败n);exit(0);/建立Socketsock=socket(PF_INET,SOCK_STREAM,IP

3、PROTO_TCP);if(sock=INVALID_SOCKET)printf(创建socket失败n);WSACleanup();exit(0);/从控制台输入服务器端的域名地址 printf(请输入pop3服务器的域名地址：n);scanf(%s,hostName); pHost=gethostbyname(hostName);/构造服务器端的地址结构，用于与服务器的连接memset(&servAddr,0,sizeof(servAddr);/结构体清零servAddr.sin_family=AF_INET;/servAddr.sin_addr.s_addr = inet_addr(ho

4、stIP);servAddr.sin_addr.s_addr = (*(struct in_addr*)pHost-h_addr).s_addr;servAddr.sin_port=htons(110); /连接服务器if(connect(sock,(struct sockaddr *)&servAddr,sizeof(servAddr)=SOCKET_ERROR )printf(连接建立失败n);closesocket(sock);WSACleanup();exit(0);/接收服务器响应byteRcvd = recv(sock,respondFromServer,MAX_SIZE,0);i

5、f(byteRcvd = SOCKET_ERROR) printf(连接响应失败n);closesocket(sock);WSACleanup();exit(0);elseif(memcmp(respondFromServer,-ERR,4)=0)printf(连接错误n);closesocket(sock);WSACleanup();exit(0);elseprintf(服务器响应：); for(i=0;ibyteRcvd;i+)printf(%c,respondFromServeri);printf(n);/验证用户名memset(resString, 0, sizeof(resStrin

6、g);/信息清空 memset(command,0,MAX_SIZE);printf(请输入用户名:n);scanf(%s,resString); memcpy(command,USER ,strlen(USER ); memcpy(command+strlen(USER ),resString,strlen(resString); memcpy(command+strlen(USER )+strlen(resString),rn,2);send(sock,command,strlen(command),0);byteRcvd = recv(sock,respondFromServer,MAX

7、_SIZE,0);if(byteRcvd = SOCKET_ERROR) printf(socket错误n);closesocket(sock);WSACleanup();exit(0);elseif(memcmp(respondFromServer,-ERR,4)=0)printf(用户名错误n);closesocket(sock);WSACleanup();exit(0);elseprintf(服务器响应：);for(i=0;ibyteRcvd;i+)printf(%c,respondFromServeri);printf(n);/验证密码memset(resString, 0, size

8、of(resString);/信息清空 memset(command,0,MAX_SIZE);printf(请输入密码:n);i=0;while(resStringi=getch() if(resStringi=13) printf(n); break; if(resStringi!=b) printf(*); i+; else printf(b b); i-; resStringi=0; memcpy(command,PASS ,strlen(PASS ); memcpy(command+strlen(PASS ),resString,strlen(resString); memcpy(co

9、mmand+strlen(PASS )+strlen(resString),rn,2);send(sock,command,strlen(command),0);byteRcvd = recv(sock,respondFromServer,MAX_SIZE,0);if(byteRcvd = SOCKET_ERROR) printf(socket错误n);closesocket(sock);WSACleanup();exit(0);elseif(memcmp(respondFromServer,-ERR,4)=0)printf(密码错误n);closesocket(sock);WSACleanu

10、p();exit(0);elseprintf(服务器响应：);for(i=0;ibyteRcvd;i+)printf(%c,respondFromServeri);printf(n); /显示邮件数目memset(resString, 0, sizeof(resString);/信息清空 memset(command,0,MAX_SIZE);memcpy(command,STAT ,strlen(STAT);memcpy(command+strlen(STAT),rn,2);printf(%s,command);send(sock,command,strlen(command),0);byte

11、Rcvd = recv(sock,respondFromServer,MAX_SIZE,0);if(byteRcvd = SOCKET_ERROR) printf(socket错误n);closesocket(sock);WSACleanup();exit(0);elseif(memcmp(respondFromServer,-ERR,4)=0)printf(应答错误n);closesocket(sock);WSACleanup();exit(0);elseprintf(服务器响应：);for(i=0;ibyteRcvd;i+)printf(%c,respondFromServeri);pri

12、ntf(n);/返回指定邮件的内容/*memset(resString, 0, sizeof(resString);/信息清空 memset(command,0,MAX_SIZE);memcpy(command,RETR ,strlen(RETR );memcpy(command+strlen(RETR ),4rn,3);printf(%s,command);send(sock,command,strlen(command),0);byteRcvd = recv(sock,respondFromServer,MAX_SIZE,0);if(byteRcvd = SOCKET_ERROR) printf(socket错误n);closesocket(sock);WSACleanup();exit(0);elseif(memcmp(respondFromServer,-ERR,4)=0)printf(应答错误n);closesocket(sock);WSACleanup();exit(0);elseprintf(服务器响应：);for(i=0;ibyteRcvd;i+)printf(%c,respondFromServeri);printf(n);while(1)memset(mailBuf,0,MAX_SIZE);byteRcvd = recv(sock,mailBuf,MAX