计算机网络实验SMTP邮件发送系统socket编程

实验邮件客户端实现1316-30-何珊珊[实验名称]：邮件客户端实现[实验器材]：右与因特网连接的计算机网络系统；右主机操作系统为Windows7;右VC6[实验内容]：：要求学生利用已有的套接字常识使用SMTP和POP3的任一种协议，实现对于特定邮件服务器(mail.163)的发送邮件功能。[实验步骤]：在VC6中搭建工程，因为SMTP中用户名和密码都要经过64位编码的处理，所以工程中除了对SMTP的编程外还需要一个64为编码的转换函数。以下是代码：MailTest.cpp:#include"stdafx.h"#include"SMTP.h"intmain(intargc,char*argv[]){charto[256];chartitle[256];charbody[1024];charstrServer[128];charstrUser[128];charstrPsw[128];charstrSndMail[128];CSMTPsmtp;smtp.Initialize();/*charto[]="heshanshan2512@";chartitle[]="test";charbody[]="heshanshan09211595";charstrServer[]="SMTP.163.com";charstrUser[]="shan_shan2512";charstrPsw[]="shanshan091756";charstrSndMail[]="shan_shan2512@163.com";*/ //提示输入的信息printf("strServer:");scanf("%s",strServer);printf("strSndMail:");scanf("%s",strSndMail);printf("strUser:");scanf("%s",strUser);printf("strPsw:");scanf("%s",strPsw);printf("to:");scanf("%s",to);printf("title:");scanf("%s",title);printf("body:");scanf("%s",body);if(smtp.MailSend(to,title,body,strServer,strUser,strPsw,strSndMail)){printf("successful\n");//发送成功}else{printf("fail\n");//发送失败}return0;}SMTP.h:#pragmaonce#include<string>#include"Base64.h"#include<Winsock2.h>#pragmacomment(lib,"Ws2_32")#include<windows.h>#include<time.h>usingnamespacestd;classCSMTP{public:CSMTP(void);~CSMTP(void);BOOLInitialize(void);BOOLMailSend(stringto,stringtitle,stringbody,stringstrServer,stringstrUser,stringstrPsw,stringstrSndMail);private:SOCKETm_socket;};SMTP.cpp:

#include"stdafx.h"#include"SMTP.h"#defineMAX_PACKET_SIZE1024CSMTP::CSMTP(void)//构造函数{m_socket=NULL;}CSMTP::~CSMTP()//析构函数BOOLCSMTP::Initialize() //入口函数{WORDwVersionRequested; //用WSAStartup函数加载套接字库，并进行版本协商WSADATAwsaData;interr;wVersionRequested=MAKEWORD(1,1);err=WSAStartup(wVersionRequested,&wsaData);if(err!=0){returnFALSE;}if(LOBYTE(wsaData.wVersion)!=1||HIBYTE(wsaData.wVersion)!=1)WSACleanup();returnFALSE;}returnTRUE;}BOOLCSMTP::MailSend(stringto,stringtitle,stringbody,stringstrServer,stringstrUser,stringstrPsw,stringstrSndMail){sockaddr_inaddrSmtp; //配置服务端地址信息constchar*smtpServer=strServer.c_str();constchar*smtpUser=strUser.c_str();constchar*smtpPass=strPsw.c_str();constchar*senderMail=strSndMail.c_str();if(m_socket!二NULL) 〃判断socket是否可用，若不可用重新创建{closesocket(m_socket);m_socket=NULL;if(m_socket==NULL){m_socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);//创建一个客户端的套接字}structin_addrin;hostent*hosts=gethostbyname(smtpServer);//域名转换if(hosts!=NULL){memcpy((char**)&(in),hosts->h_addr,hosts->h_length)//把主机地址付给in}else{returnFALSE;}stringaddrc=inet_ntoa(in);//将网络字节序转换成应用的格式addrSmtp.sin_family=AF_INET;//配置服务端地址信息addrSmtp.sin_addr.s_addr=in.S_un.S_addr;addrSmtp.sin_port=htons(25);//SMTP的端口号为25intret=0;ret=connect(m_socket,(LPSOCKADDR)&addrSmtp,sizeof(addrSmtp));//与服务端进行连接if(ret==SOCKET_ERROR)//连接失败{char*err=newchar[1024];sprintf(err,"连接失败％d",GetLastError());printf("%s\n",err);returnFALSE;}chars[MAX_PACKET_SIZE];charr[MAX_PACKET_SIZE];memset((void*)s,0,MAX_PACKET_SIZE);memset((void*)r,0,MAX_PACKET_SIZE);intlen;stringresponse;//等待服务器回应len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len)response=r;intposition=response.substr(0,3).compare("220");//判断返回信息的前三个字符是否为220，如果是，表示连接服务器成功if(position==0){len=sprintf((char*)s,"helo%s\r\n",strUser.c_str());//将用户名赋给s并发送给服务器len=send(m_socket,s,strlen(s),0);}else{printf(r);if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;•BSlVdUjnie」【linN二妙pos—iu：ft9>|DOS_lU）19>|DOS9SOpfte>|DOS_iu）4!^（J）puud}9S|9{：（0，（S）U9|JlS，S，19>|DOS_lU）pU9S=U9|器參缆修S尊◎胆胡到层豆坯〃•（..u\J\NID01HinV..，sGjeqD））puuds=u9|}（0二二uoq!sod）j!丄沓罰回聊竺峯'者剖輕0立空者瞬&三W&0WW回虫期條〃【（“os乙）aediuo丁（£'o）Hsqns~suodsa二uo^sodiu!：j=9suodse」}（U引）j!WW&0回虫器參缆勒尋//l（03ZIS\Lm>DVcrxVIAr」（¥」eLp）M>pos—w）2a=u引•BSlVdUjniejelse{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//等待登录回应len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);//接收服务器返回的信息if(len){response=r;intposition=response.substr(0,3).compare("334");//判断返回信息的前三个字符是否为334，如果是，表示此时可以输入64位编码过的用户名了if(position==0){unsignedchar*dst=(unsignedchar*)smtpUser;stringstrTmp=Base64::base64_encode(dst,len);//进行64位编码len=sprintf((char*)s,"%s\r\n",(constchar*)strTmp.c_str());len=send(m_socket,s,strlen(s),0);//发送编码过的用户名}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//发送完用户名后等待回应len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);//发送编码过的密码，代码和发送用户名时的方式类似if(len){response=r;intposition=response.substr(0,3).compare("334");if(position==0){unsignedchar*dst=(unsignedchar*)smtpPass;len=strlen((char*)dst);stringstrTmp=Base64::base64_encode(dst,len);len=sprintf((char*)s,"%s\r\n",(constchar*)strTmp.c_str());len=send(m_socket,s,strlen(s),0);}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//发送完密码后等待回应看是否登录成功len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("235");if(position==0){len=sprintf((char*)s,"MAILFROM:<%s>\r\n",senderMail);len=send(m_socket,s,strlen(s),0);//发送本地邮箱的地址}elseclosesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//header部份len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("250");if(position==0)len=sprintf((char*)s,"RCPTTO:<%s>\r\n",to.c_str());//发送要发送的邮箱的地址len=send(m_socket,s,strlen(s),0);}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;//header部份len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("250");if(position==0){len二sprintf((char*)s,"DATA\r\n");〃发送data向服务器发送邮件内容的申请len=send(m_socket,s,strlen(s),0);}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}elseif(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("354");if(position==0){chardate_string[MAX_PACKET_SIZE];time_tseconds;//调用本地时间time(&seconds);strftime(date_string,MAX_PACKET_SIZE,"%a,%d%b%y%H:%M:%S+0800",localtime(&seconds));sprintf((char*)s,"From:%s\r\nTo:%s\r\nDate:%s\r\nSubject:%s\r\n\r\nX-Mailer:%s\r\nX-Priority:%s\r\nMIME-Version:1.0\r\nContent-type:multipart/mixed;boundary=\"%s\"\r\n\r\n",senderMail,to.c_str(),date_string,title.c_str(),"SMailer","3","#BOUNDARY#");len=send(m_socket,s,strlen(s),0);}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//邮件正文sprintf((char*)s,"--%s\r\nContent-Type:%s\r\nContent-Disposition:%s\r\nContent-Transfer-Encoding:%s\r\n\r\n%s\r\n\r\n","#BOUNDARY#","text/plain;charset=gb2312","","8bit",body.c_str());len=send(m_socket,s,strlen(s),0);//邮件结束sprintf((char*)s,"\r\n--%s--\r\n.\r\n","#BOUNDARY#");len=send(m_socket,s,strlen(s),0);len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("250");if(position==0){//退出连接sprintf((char*)s,"QUIT\r\n");len=send(m_socket,s,strlen(s),0);}elseif(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;}//断开连接len=recv(m_socket,(char*)r,MAX_PACKET_SIZE,0);if(len){response=r;intposition=response.substr(0,3).compare("221");if(position==0){if(m_socket)closesocket(m_socket);m_socket=NULL;}else{if(m_socket)closesocket(m_socket);m_socket=NULL;printf(r);returnFALSE;}}else{if(m_socket)closesocket(m_socket);m_socket=NULL;returnFALSE;returnTRUE;}Base64.cpp:#include"StdAfx.h"#include"Base64.h"staticconststd::stringbase64_chars="ABCDEFGHIJKLMNOPQRSTUVWXYZ""abcdefghijklmnopqrstuvwxyz""0123456789+/";std::stringBase64::base64_encode(unsignedcharconst*bytes_to_encode,unsignedintin_len){std::stringret;inti=0;intj=0;unsignedcharchar_array_3[3];while(in_len--){char_array_3[i++]=*(bytes_to_encode++);if(i==3){char_array_4[0]=(char_array_3[0]&0xfc)>>2;char_array_4[1]=((char_array_3[0]&0x03)<<4)+((char_array_3[1]&0xf0)>>4);char_array_4[2]=((char_array_3[1]&0x0f)<<2)+((char_array_3[2]&0xc0)>>6);char_array_4[3]=char_array_3[2]&0x3f;for(i=0;(i<4);i++)ret+=base64_chars[char_array_4[i]];i=0;}}if(i){for(j=i;j<3;j++)char_array_4[0]=(char_array_3[0]&0xfc)>>2;char_array_4[1]=((char_array_3[0]&0x03)<<4)+((char_array_3[1]&0xf0)>>4);char_array_4[2]=((char_array_3[1]&0x0f)<<2)+((char_array_3[2]&0xc0)>>6);char_array_4[3]=char_array_3[2]&0x3f;for(j=0;(j<i+1);j++)ret+=base64_chars[char_array_4[j]];while((i++<3))ret+='=';}returnret;}std::stringBase64::base64_decode(std::stringconst&encoded_string){intin_len=encoded_string.size();inti=0;intj=0;intin_=0;unsignedcharchar_array_4[4],char_array_3[3];std::stringret;while (in_len-- &&(encoded_string[in_]!='=')&&is_base64(encoded_string[in_])){char_array_4[i++]=encoded_string[in_];in_++;if(i==4){for(i=0;i<4;i++)char_array_4[i]=base64_chars.find(char_array_4[i]);char_array_3[0]=(char_array_4[0]<<2)+((char_array_4[1]&0x30)>>4)