C语言实现简单的SMTP发送邮件

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C语言实现简单的SMTP发送邮件

2012-07-23 21:28:43| 分类：VC++ | 标签：|举报|字号大中小订阅
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#include <windows.h>#include <stdio.h>#include <WinSock.h>#include <iostream>using namespace std;#pragma  comment(lib, "ws2_32.lib")struct Base64Date6{  unsigned int d4:6;  unsigned int d3:6;  unsigned int d2:6;  unsigned int d1:6;};// 协议中加密部分使用的是base64方法char ConvertToBase64  (char   c6);void EncodeBase64     (char   *dbuf, char *buf128, int len);void SendMail         (char   *email,char *body);int  OpenSocket       (struct sockaddr *addr);int main(){  char EmailTo[]         = "hanyinlong@126.com";  char EmailContents[]   = "From: \"lucy\"<hanyinlong@126.com>\r\n"                           "To: \"dasiy\"<hanyinlong@126.com>\r\n"                           "Subject: Hello\r\n\r\n"                           "Hello World, Hello Email!";  SendMail(EmailTo, EmailContents);  return 0;}char ConvertToBase64(char uc){  if(uc < 26)  {    return 'A' + uc;  }  if(uc < 52)  {    return 'a' + (uc - 26);  }  if(uc < 62)  {    return '0' + (uc - 52);  }  if(uc == 62)  {    return '+';  }  return '/';}// base64的实现void EncodeBase64(char *dbuf, char *buf128, int len){  struct Base64Date6 *ddd      = NULL;  int           i        = 0;  char          buf[256] = {0};  char          *tmp     = NULL;  char          cc       = '\0';  memset(buf, 0, 256);  strcpy_s(buf, 256, buf128);  for(i = 1; i <= len/3; i++)  {    tmp             = buf + (i-1)*3;    cc              = tmp[2];    tmp[2]          = tmp[0];    tmp[0]          = cc;    ddd             = (struct Base64Date6 *)tmp;    dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3);    dbuf[(i-1)*4+3] = ConvertToBase64((unsigned int)ddd->d4);  }  if(len % 3 == 1)  {    tmp             = buf + (i-1)*3;    cc              = tmp[2];    tmp[2]          = tmp[0];    tmp[0]          = cc;    ddd             = (struct Base64Date6 *)tmp;    dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i-1)*4+2] = '=';    dbuf[(i-1)*4+3] = '=';  }  if(len%3 == 2)  {    tmp             = buf+(i-1)*3;    cc              = tmp[2];    tmp[2]          = tmp[0];    tmp[0]          = cc;    ddd             = (struct Base64Date6 *)tmp;    dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3);    dbuf[(i-1)*4+3] = '=';  }  return;}// 发送邮件void SendMail(char *email, char *body){  int     sockfd     = {0};  char    buf[1500]  = {0};  char    rbuf[1500] = {0};  char    login[128] = {0};  char    pass[128]  = {0};  WSADATA WSAData;  struct sockaddr_in their_addr = {0};  WSAStartup(MAKEWORD(2, 2), &WSAData);  memset(&their_addr, 0, sizeof(their_addr));    their_addr.sin_family = AF_INET;  their_addr.sin_port   = htons(25);  hostent* hptr         = gethostbyname("smtp.126.com");   memcpy(&their_addr.sin_addr.S_un.S_addr, hptr->h_addr_list[0], hptr->h_length);   printf("IP of smpt.126.com is : %d:%d:%d:%d\n",           their_addr.sin_addr.S_un.S_un_b.s_b1,           their_addr.sin_addr.S_un.S_un_b.s_b2,           their_addr.sin_addr.S_un.S_un_b.s_b3,           their_addr.sin_addr.S_un.S_un_b.s_b4);   // 连接邮件服务器，如果连接后没有响应，则2 秒后重新连接  sockfd = OpenSocket((struct sockaddr *)&their_addr);  memset(rbuf, 0, 1500);  while(recv(sockfd, rbuf, 1500, 0) == 0)  {    cout<<"reconnect..."<<endl;    Sleep(2);    sockfd = OpenSocket((struct sockaddr *)&their_addr);    memset(rbuf, 0, 1500);  }  cout<<rbuf<<endl;  // EHLO  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "EHLO HYL-PC\r\n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"EHLO REceive: "<<rbuf<<endl;  // AUTH LOGIN  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "AUTH LOGIN\r\n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Auth Login Receive: "<<rbuf<<endl;  // USER  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "hanyinlong@126.com");//你的邮箱账号  memset(login, 0, 128);  EncodeBase64(login, buf, strlen(buf));  sprintf_s(buf, 1500, "%s\r\n", login);  send(sockfd, buf, strlen(buf), 0);  cout<<"Base64 UserName: "<<buf<<endl;  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"User Login Receive: "<<rbuf<<endl;  // PASSWORD  sprintf_s(buf, 1500, "XXXXXXXXXXXX");//你的邮箱密码  memset(pass, 0, 128);  EncodeBase64(pass, buf, strlen(buf));  sprintf_s(buf, 1500, "%s\r\n", pass);  send(sockfd, buf, strlen(buf), 0);  cout<<"Base64 Password: "<<buf<<endl;  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Send Password Receive: "<<rbuf<<endl;  // MAIL FROM  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "MAIL FROM: <hanyinlong@126.com>\r\n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"set Mail From Receive: "<<rbuf<<endl;  // RCPT TO 第一个收件人  sprintf_s(buf, 1500, "RCPT TO:<%s>\r\n", email);  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Tell Sendto Receive: "<<rbuf<<endl;  // DATA 准备开始发送邮件内容  sprintf_s(buf, 1500, "DATA\r\n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Send Mail Prepare Receive: "<<rbuf<<endl;  // 发送邮件内容，\r\n.\r\n内容结束标记  sprintf_s(buf, 1500, "%s\r\n.\r\n", body);  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Send Mail Receive: "<<rbuf<<endl;  // QUIT  sprintf_s(buf, 1500, "QUIT\r\n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout<<"Quit Receive: "<<rbuf<<endl;  //清理工作  closesocket(sockfd);  WSACleanup();  return;}// 打开TCP Socket连接int OpenSocket(struct sockaddr *addr){  int sockfd = 0;  sockfd=socket(PF_INET, SOCK_STREAM, 0);  if(sockfd < 0)  {    cout<<"Open sockfd(TCP) error!"<<endl;    exit(-1);  }  if(connect(sockfd, addr, sizeof(struct sockaddr)) < 0)  {    cout<<"Connect sockfd(TCP) error!"<<endl;    exit(-1);  }  return sockfd;}
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