SMTP协议的通讯模型和会话流程
SMTP协议通讯模型
SMTP协议是TCP/IP协议族中的一员，主要对如何将电子邮件从发送方地址传送到接收方地址，也即是对传输的规则做了规定。SMTP协议的中漏通信模型并不复杂，主要工作集中在发送SMTP和接收SMTP上：首先针对衡纤用户发出的邮件请求，由发送SMTP建立一条连接到接收SMTP的双工通讯链路，这里的接收SMTP是相对于发送SMTP而言的，实际上它既可以是最终的接收者也可以是中间传送者。发送SMTP负责向接收SMTP发送SMTP命令，而接收SMTP则负责接收并反馈应答。
只能说主要代码，程序是一个整体，如果友凯竖要直接编译通过，那就要整个发了你自己改下吧
int CMail::sendmail()
{
int crecv
if(smtplogin()==0)
{
return 0
}
//发送mail from 返回250
sprintf(m_sendbuff,"%s%s%s","mail from:<",m_user,"@163.com>\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"250",3)!=NULL)
{
m_error=MAIL_FROM_ERROR
return 0
}
//发送rcpt to 返回250
sprintf(m_sendbuff,"%s%s%s","rcpt to:<",m_rcptto,">\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"250",3)!=NULL)
{
m_error=RCPT_TO_ERROR
return 0
}
//发送data\r\n 返回354
sprintf(m_sendbuff,"%s","data\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"354",3)!=NULL)
{
m_error=DATA_ERROR
return 0
}
//信好大头
if(!SetMailHeader(m_sendbuff))
{
m_error=MAILHEADER_ERROR
return 0
}
if(senddata()==0)
{
return 0
}
//发送空行
sprintf(m_sendbuff,"%s","\r\n\r\n")
if(senddata()==0)
{
return 0
}
/孙衫/发送邮件body
sprintf(m_sendbuff,"%s%s",m_data,"\r\n")
if(senddata()==0)
{
return 0
}
if(m_attachment!=NULL)
{
char **pp
for(pp=m_attachment*pp!=0pp++)
{
FILE* fp
char *buf
//准备发送附件，首先发送分界线,必须!
sprintf(m_sendbuff,"%s%s%s","--",BOUNDARY_TEXT,"\r\n")
if(senddata()==0)
{
return 0
}
sprintf(m_sendbuff,"%s%s%s","Content-Type: application/x-msdownloadname=\"",strrchr(*pp,'\\')+1,"\"\r\n")
if(senddata()==0)
{
return 0
}
sprintf(m_sendbuff,"%s","Content-Transfer-Encoding: base64\r\n")
if(senddata()==0)
{
return 0
}
sprintf(m_sendbuff,"%s%s%s","Content-Disposition: attachmentfilename=\"",strrchr(*pp,'\\')+1,"\"\r\n\r\n")
if(senddata()==0)
{
return 0
}
//将文件base64编码后发送
fp=fopen(*pp,"rb")
if(fp==NULL)
{
m_error=OPEN_FILE_ERROR
return 0
}
buf=new char[BUFFERSIZE+1]
memset(buf,0,BUFFERSIZE+1)
int readcount=0
while(!feof(fp))
{
readcount=fread(buf,1,BUFFERSIZE,fp)
if(readcount>0)
{
*(buf+readcount)='\0'
sprintf(m_sendbuff,"%s%s",base64(buf,ENCODE,readcount),"\r\n")
if(senddata()==0)
{
return 0
}
memset(buf,0,BUFFERSIZE+1)
}
}
sprintf(m_sendbuff,"%s","\r\n")
if(senddata()==0)
{
return 0
}
delete[] buf
fclose(fp)
}
}
if(m_attachment!=NULL)
{
//附件发送完毕，发送分界线
sprintf(m_sendbuff,"%s%s%s","--",BOUNDARY_TEXT,"--\r\n")
if(senddata()==0)
{
return 0
}
}
//发送.\r\n 结束 返回250
sprintf(m_sendbuff,"%s",".\r\n")
if(senddata()==0)
{
return 0
}
crecv=recv(s,m_recvbuff,MAX_LENGTH,0)
if(strncmp(m_recvbuff,"250",3)!=NULL)
{
m_error=END_DATA_ERROR
return 0
}
else
{
showmessage(NULL,"邮件发送成功","",NULL)
}
//退出
sprintf(m_sendbuff,"%s","quit\r\n")
if(senddata()==0)
{
return 0
}
if(closesocket(s)!=0)
{
m_error=CLOSE_SOCKET_ERROR
return 0
}
if(WSACleanup()!=0)
{
m_error=CLEANUP_WSA_ERROR
return 0
}
return 1
}
int CMail::senddata()
{
int idx = 0
int csend
int count=strlen(m_sendbuff)
while(count>0)
{
if((csend=send(s,m_sendbuff+idx,count,0))==SOCKET_ERROR)
{
m_error =WSA_SEND_ERROR
return 0
}
if(csend==0)
{
break
}
count-=csend
idx+=csend
}
return 1
}
int CMail::recvdata()
{
int crecv
crecv=recv(s,m_recvbuff,MAX_LENGTH,0)
if(crecv==SOCKET_ERROR)
{
m_error =WSA_RECV_ERROR
return 0
}
else if(crecv==0)
{
m_error=WSA_RECV_ERROR
return 0
}
else
{
}
return 1
}
int CMail::chartoindex(char c)
{
if(c>=65&&c<=90)
{
c-=65
}
else if(c>=97&&c<=122)
{
c-=71
}
else if(c>=48&&c<=57)
{
c+=4
}
else if(c==43)//'+'
{
c=62
}
else if(c==47)//'/'
{
c=63
}
else if(c==61)//'='
{
c=0
}
else
{
m_error=DECODE_ERROR
return 0
}
return c
}
bool CMail::SetMailHeader(char* header)
{
// "Date:","From:","To:",
// "Message-ID:","Subject:","MIME-Version:",
// "Content-Type:","X-Priority:",
// "X-Mailer:","X-CM-TRANSID:","X-CM-SenderInfo:",
// "X-Coremail-Antispam:","\r\n\r\n"
TCHAR szDate[500]
TCHAR sztTime[500]
// Date: <SP><dd><SP><mon><SP><yy><SP><hh>":" <mm>":" <ss><SP><zone><CRLF>
SYSTEMTIME st={0}
::GetSystemTime(&st)
::GetDateFormat(MAKELCID(0x0409,SORT_DEFAULT),0,&st,"ddd\',\' dd MMM yyyy",szDate,sizeof(szDate))
::GetTimeFormat(MAKELCID(0x0409,SORT_DEFAULT),TIME_FORCE24HOURFORMAT,&st,"HH\':\'mm\':\'ss",sztTime,sizeof(sztTime))
sprintf(header,"Date: %s %s\r\n", szDate, sztTime)
// From: <SP><sender> <SP>"<" <sender-email>">" <CRLF>
if(m_mailfrom!=NULL)
{
strcat(header,"From: ")
strcat(header," <")
strcat(header,m_mailfrom)
strcat(header, ">\r\n")
}
// X-Mailer: <SP><xmailer-app><CRLF>
if(m_xmailer!= NULL)
{
strcat(header,"X-Mailer: ")
strcat(header, m_xmailer)
strcat(header, "\r\n")
}
// X-Priority: <SP><number><CRLF>
switch(m_priority)
{
case XPRIORITY_HIGH:
strcat(header,"X-Priority: 2 (High)\r\n")
break
case XPRIORITY_NORMAL:
strcat(header,"X-Priority: 3 (Normal)\r\n")
break
case XPRIORITY_LOW:
strcat(header,"X-Priority: 4 (Low)\r\n")
break
default:
strcat(header,"X-Priority: 3 (Normal)\r\n")
}
// To: <SP><remote-user-mail><CRLF>
if(m_rcptto!=NULL)
{
strcat(header,"To: ")
strcat(header, m_rcptto)
strcat(header, "\r\n")
}
// Subject: <SP><subject-text><CRLF>
if(m_subject!=NULL)
{
strcat(header, "Subject: ")
strcat(header, m_subject)
strcat(header, "\r\n")
}
// MIME-Version: <SP>1.0 <CRLF>
strcat(header,"MIME-Version: 1.0\r\n")
//attachment
if(m_attachment==NULL)
{ //如果没附件
strcat(header,"Content-type: text/plaincharset=GB2312\r\n")
strcat(header,"Content-Transfer-Encoding: 7bit\r\n")
strcat(header,"\r\n")
}
else
{ //如果有附件，设置分界线,每个子段以--BOUNDARY_TEXT行开始，父段则以--BOUNDARY_TEXT--行结束，不同段之间用空行分隔
strcat(header,"Content-Type: multipart/mixedboundary=\"")
strcat(header,BOUNDARY_TEXT)
strcat(header,"\"\r\n")
strcat(header,"\r\n")//这个空行不能少
//第一部分为文本内容
strcat(header,"--")strcat(header,BOUNDARY_TEXT)strcat(header,"\r\n")//加上分界线
//以下跟没附件时的一样
strcat(header,"Content-type: text/plaincharset=GB2312\r\n")//注意GB2312 否则会出现中文乱码
strcat(header,"Content-Transfer-Encoding: 7bit\r\n")
}
// done
return true
}
int CMail::senddata()
{
int idx = 0
int csend
int count=strlen(m_sendbuff)
while(count>0)
{
if((csend=send(s,m_sendbuff+idx,count,0))==SOCKET_ERROR)
{
m_error =WSA_SEND_ERROR
return 0
}
if(csend==0)
{
break
}
count-=csend
idx+=csend
}
return 1
}
int CMail::recvdata()
{
int crecv
crecv=recv(s,m_recvbuff,MAX_LENGTH,0)
if(crecv==SOCKET_ERROR)
{
m_error =WSA_RECV_ERROR
return 0
}
else if(crecv==0)
{
m_error=WSA_RECV_ERROR
return 0
}
else
{
}
return 1
}
int CMail::smtplogin()
{
//调用成员函数connect
if(connect()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strstr(m_recvbuff,"220")==NULL)//220
{
m_error=UNKNOWEN_ERROR
return 0
}
//发送helo 返回250
sprintf(m_sendbuff,"%s","helo 543880135\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"250",3)!=NULL)
{
m_error=HELO_ERROR
return 0
}
//发送auth login 返回334
sprintf(m_sendbuff,"%s","auth login\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"334",3)!=NULL)
{
m_error=AUTH_LOGIN_ERROR
return 0
}
//发送经过base64编码后的用户名，返回334
sprintf(m_sendbuff,"%s%s",base64(m_user,ENCODE,strlen(m_user)),"\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"334",3)!=NULL)
{
m_error=USER_ERROR
return 0
}
//发送经过base64编码后的密码 返回235
sprintf(m_sendbuff,"%s%s",base64(m_pass,ENCODE,strlen(m_pass)),"\r\n")
if(senddata()==0)
{
return 0
}
if(recvdata()==0)
{
return 0
}
if(strncmp(m_recvbuff,"235",3)!=NULL)
{
m_error=PASS_ERROR
return 0
}
return 1
}
int CMail::connect()
{
WSADATA wsadata
struct sockaddr_in sock_addr
HOSTENT *phostent
struct in_addr inaddr
if(WSAStartup(MAKEWORD(1,1),&wsadata)<0)
{
m_error=WSA_INIT_ERROR
return 0
}
/*---------------根据域名获取网络地址，存放在struct in_addr中----------------*/
phostent=gethostbyname(m_server)//pop.163.com
if(phostent!=NULL)
{
// lpAddr=phostent->h_addr_list[0]
memmove(&inaddr,phostent->h_addr_list[0],4)//220.181.12.101
}
else
{
m_error=CONNECTSERVER_ERROR
return 0
}
/*---------------根据域名获取网络地址，存放在struct in_addr中----------------*/
s=socket(AF_INET, SOCK_STREAM,IPPROTO_TCP)//SOCK_STREAM SOCK_DGRAM
sock_addr.sin_family=AF_INET
sock_addr.sin_port=htons(m_port)
sock_addr.sin_addr=inaddr//直接结构体赋值给结构体，或者写成：sock_addr.sin_addr.s_addr=inaddr.S_un.S_addr
if(::connect(s,(struct sockaddr *)&sock_addr,sizeof(sock_addr)))
{
m_error=CONNECT_ERROR
return 0
}
return 1
}
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