朋友的一个程序需要带ESMTP发送附件功能.从网上找的现成代码不是没有身份验证就是太冗长.故用一个不带身份验证的封装了一个函数,没有任何容错,比较烂,需要的话自己加. 不过让偶对邮件发送过程有了一个清楚的认识.
下面是代码,懒得上传了.
smtp.h:
代码:
/******************************************************************************
* smtp.cpp - Use SMTP to send an E-Mail with an Attachment and verify *
* By SysHu0teR *
* 04-23-2005 *
******************************************************************************
*/
#include <winsock2.h>
#include <string.h>
#include <stdio.h>
const int BASE64_MAXLINE = 76;
const char EOL[] = "\r\n";
const char BASE64_TAB[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz0123456789+/";
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen);
int SendMail(char *from, char *to,char *smtpserver,char *username,char *passwd,char *FullFilePath,char *filename="0000.000");
//For Example:
//SendMail("syshunter@21cn.com","system2001@21cn.com","syshunter","mypasswd","d:\sc.txt","sc.txt");
smtp.cpp:
代码:
/******************************************************************************
* smtp.cpp - Use SMTP to send an E-Mail with an Attachment and verify *
* By SysHu0teR *
* 04-23-2005 *
******************************************************************************
*/
//---------------------------------------------------------------------------
#include "smtp.h"
int SendMail(char *from, char *to, char *smtpserver,char *username,char *passwd,char *FullFilePath,char *filename)
{
WSADATA wsaData;
int SockFD;
struct sockaddr_in ServAddr;
int x;
FILE *fp;
char *aatt = new char[0x400000];
char *batt = new char[0x555556];
char HEADER[512]; //邮件头，包含地址，登陆用户名等信息
char ATT_HEADER[512]; //附件信息
char user[80];
char pass[80];
const char CONTENT[] = //邮件正文部分
"\r\n--boundary\r\n"
"Content-Type: text/plain; charset=gb2312\r\n"
//"Content-Transfer-Encoding: quoted-printable\r\n"
"Content-Transfer-Encoding: 8bit\r\n"
"\r\n"
"邮件测试正文邮件测试正文邮件测试正文邮件测试正文邮件测试正文\r\n"
"邮件测试正文邮件测试正文邮件测试正文邮件测试正文邮件测试正文\r\n"
"邮件测试正文邮件测试正文邮件测试正文邮件测试正文邮件测试正文\r\n"
"\r\n";
ANSIToBase64(username,strlen(username),user,sizeof(user));
ANSIToBase64(passwd,strlen(passwd),pass,sizeof(pass));
user[strlen(user)]=0;
pass[strlen(pass)]=0;
sprintf(HEADER,"HELO 21cn.com\r\n"
"AUTH LOGIN\r\n" //开始登陆
"%s" //经过base64编码的用户名
"%s" //经过base64编码的密码
"MAIL FROM: %s\r\n" //邮件从哪来?
"RCPT TO: %s\r\n" //到哪去?可有多个RCPT TO
"DATA\r\n"
"FROM: %s\r\n" //同上,可以伪造:D
"TO: %s\r\n"
"SUBJECT: this is a test\r\n"
"Date: 2005-4-23\r\n"
"MIME-Version: 1.0\r\n"
"Content-type: multipart/mixed; boundary=\"boundary\"\r\n"
"\r\n",user,pass,from,to,from,to);
sprintf(ATT_HEADER,"\r\n--boundary\r\n" //对附件格式进行说明
"Content-Type: application/octet-stream; name=%s\r\n"
"Content-Transfer-Encoding: base64\r\n"
"Content-Disposition: attachment; filename=%s\r\n"
"\r\n",filename,filename); //邮件中显示的附件名,默认是0000.000,(那不是能骗人了?:O)
printf("%s",HEADER);
printf("%s",ATT_HEADER);
WSAStartup(MAKEWORD(2,2), &wsaData);
LPHOSTENT pHost = gethostbyname(smtpserver);
SockFD = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
ServAddr.sin_family = AF_INET;
ServAddr.sin_addr.s_addr = *(ULONG *)pHost->h_addr_list[0];
ServAddr.sin_port = htons(25);
connect(SockFD, (struct sockaddr *)&ServAddr, sizeof(ServAddr));
//send HEADER
send(SockFD, HEADER, strlen(HEADER), 0);
//send CONTENT
send(SockFD, CONTENT, strlen(CONTENT), 0);
//send ATT_HEADER
send(SockFD, ATT_HEADER, strlen(ATT_HEADER), 0);
//read attachment
fp = fopen(FullFilePath, "rb");
fseek(fp, 0, 2);
x = ftell(fp);
if (x > 0x400000)
x = 0;
rewind(fp);
fread(aatt, x, 1, fp);
fclose(fp);
x = ANSIToBase64(aatt, x, batt, 0x555556);
//send base64 attachment
send(SockFD, batt, x, 0);
send(SockFD, ".\r\n", strlen(".\r\n"), 0); //end
send(SockFD, "QUIT\r\n", strlen("QUIT\r\n"), 0); //quit
closesocket(SockFD);
WSACleanup();
delete []aatt;
delete []batt;
return 0;
}
//---------------------------------------------------------------------------
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen)
{
//Input Parameter validation
if ((szInANSI == NULL) || (nInLen == 0) || (szOutBase64 == NULL) || (nOutLen == 0))
return 0;
if (nOutLen < (nInLen*4/3 + 1 + nInLen*4/3/BASE64_MAXLINE*2 + 1 + 4))
return 0;
//Set up the parameters prior to the main encoding loop
int nInPos = 0;
int nOutPos = 0;
int nLineLen = 0;
int c1, c2, c3;
int i;
// Get three characters at a time from the input buffer and encode them
for (i=0; i<nInLen/3; ++i)
{
//Get the next 2 characters
c1 = szInANSI[nInPos++] & 0xFF;
c2 = szInANSI[nInPos++] & 0xFF;
c3 = szInANSI[nInPos++] & 0xFF;
//Encode into the 4 6 bit characters
szOutBase64[nOutPos++] = BASE64_TAB[c1 >> 2];
szOutBase64[nOutPos++] = BASE64_TAB[((c1 << 4) | (c2 >> 4)) & 0x3F];
szOutBase64[nOutPos++] = BASE64_TAB[((c2 << 2) | (c3 >> 6)) & 0x3F];
szOutBase64[nOutPos++] = BASE64_TAB[c3 & 0x3F];
nLineLen += 4;
//Handle the case where we have gone over the max line boundary
if (nLineLen > BASE64_MAXLINE - 4)
{
szOutBase64[nOutPos++] = EOL[0];
szOutBase64[nOutPos++] = EOL[1];
nLineLen = 0;
}
}
// Encode the remaining one or two characters in the input buffer
switch (nInLen % 3)
{
case 0:
{
szOutBase64[nOutPos++] = EOL[0];
szOutBase64[nOutPos++] = EOL[1];
break;
}
case 1:
{
c1 = szInANSI[nInPos] & 0xFF;
szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4)];
szOutBase64[nOutPos++] = '=';
szOutBase64[nOutPos++] = '=';
szOutBase64[nOutPos++] = EOL[0];
szOutBase64[nOutPos++] = EOL[1];
break;
}
case 2:
{
c1 = szInANSI[nInPos++] & 0xFF;
c2 = szInANSI[nInPos] & 0xFF;
szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
szOutBase64[nOutPos++] = BASE64_TAB[((c2 & 0x0F) << 2)];
szOutBase64[nOutPos++] = '=';
szOutBase64[nOutPos++] = EOL[0];
szOutBase64[nOutPos++] = EOL[1];
break;
}
default:
{
return 0;
}
}
szOutBase64[nOutPos] = 0;
return nOutPos;
}
使用方法:
将smtp.cpp和smtp.h复制到你的工程目录下，将smtp.cpp添加到你工程，在需要发送邮件的文件中#include "smtp.h",然后调用SendMail(),具体参数在smtp.h中已给出例子.
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