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sendmail.cpp
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sendmail.cpp
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////////////////////////////////////////////////////////////////////////////////////
// title : sendmail
// desc : 윈도우 콘솔에서 간단한 메일 보내는 프로그램
// author : ysoftman
// os : Windows
////////////////////////////////////////////////////////////////////////////////////
#include <Windows.h>
#include <stdio.h>
#include <string>
#pragma comment(lib, "ws2_32.lib")
using namespace std;
// E-mail 보내는 함수
int SendMail(char *EmailServer, char *EmailTo, char *EmailFrom, char *EmailSubject, char *EmailMsg)
{
SOCKET mySocket;
WSADATA wsaData;
FILE *fpSmtpLog = NULL;
struct hostent *host;
struct sockaddr_in dest_addr;
int BufferSize = 300;
int Waittime = 500;
int Sent = 0;
int Received = 0;
int len1 = strlen(EmailTo);
int len2 = strlen(EmailFrom);
int len3 = strlen(EmailSubject);
int len4 = strlen(EmailMsg);
char *EmailBuf = NULL;
char *LogBuf = NULL;
EmailBuf = (char*)malloc(len1+len2+len3+len4+100);
LogBuf = (char*)malloc(BufferSize+1);
// 메일 보내기 로그
fpSmtpLog = fopen("sendmail.log", "a");
if (WSAStartup(0x202, &wsaData) == SOCKET_ERROR)
{
fputs("WSAStartup failed\n", fpSmtpLog);
WSACleanup();
return -1;
}
if ( (host=gethostbyname(EmailServer)) == NULL)
{
perror("gethostbyname");
return -1;
}
memset(&dest_addr, 0, sizeof(dest_addr));
memcpy(&(dest_addr.sin_addr), host->h_addr, host->h_length);
// prepare dest_addr
dest_addr.sin_family = host->h_addrtype; // AF_INET from gethostbyname
dest_addr.sin_port = htons(25); // Port 설정
// Get socket
if ( (mySocket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket");
return -1;
}
// Connect
fputs("Connecting...\n", fpSmtpLog);
if (connect(mySocket, (struct sockaddr*)&dest_addr, sizeof(dest_addr)) == -1)
{
perror("Connect failed.");
return -1;
}
// SMTP 프로토콜을 사용하여 메일 보내기
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 환영 메세지 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
strcpy(EmailBuf, "HELO google.co.kr\n");
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 환영 메세지 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
sprintf(EmailBuf, "MAIL FROM:<%s>\n", EmailFrom);
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 보내는 사람 주소 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
sprintf(EmailBuf, "RCPT TO:<%s>\n", EmailTo);
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 받는 사람 주소 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
strcpy(EmailBuf, "DATA\n");
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 메일 데이터 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
Sleep(Waittime);
strcpy(EmailBuf, "To:");
strcat(EmailBuf, EmailTo);
strcat(EmailBuf, "\n");
strcat(EmailBuf, "From:");
strcat(EmailBuf, EmailFrom);
strcat(EmailBuf, "\n");
strcat(EmailBuf, "Subject:");
strcat(EmailBuf, EmailSubject);
strcat(EmailBuf, "\n");
strcat(EmailBuf, EmailMsg);
strcat(EmailBuf, "\r\n.\r\n"); // 메일 내용은 <CRLR>.<CRLR>로 끝나야 함.
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 제목과 내용 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
strcpy(EmailBuf, "QUIT\n");
fputs(EmailBuf, fpSmtpLog);
Sent = send(mySocket, EmailBuf, strlen(EmailBuf), 0); // 종료 메세지 보냄
Sleep(Waittime);
Received = recv(mySocket, LogBuf, BufferSize, 0); // 응답 받음
LogBuf[Received] = '\0';
fputs(LogBuf, fpSmtpLog);
fclose(fpSmtpLog);
if (EmailBuf != NULL)
{
free(EmailBuf);
}
if (LogBuf != NULL)
{
free(LogBuf);
}
#ifdef WIN32
closesocket(mySocket);
WSACleanup();
#else
close(mySocket);
#endif
return 0;
}
int main(int argc, char **argv)
{
if (argc != 6)
{
//printf("argc(%d) != 6\n", argc);
printf("[Usage]\n%s EmailServer To From Subject Message\n", argv[0]);
string examArgs = " gmail-smtp-in.l.google.com"
" ysoftman@gmail.com"
" ysoftman@naver.com"
" \"sendmail 프로그램 테스트\""
" \"테스트 메일 내용입니다.\"";
printf("\n[Example]\n%s %s\n", argv[0], examArgs.c_str());
string desc = "받는 사람은 메일 서버와 같은 도메인이어야 한다.\n"
"메일 서버를 모를 경우 콘솔(cmd.exe) 에서 nslookup -querytype=mx 도메인명 으로 확인 할 수 있다.\n"
"예) nslookup -querytype=mx gmail.com";
printf("\n[Tip]\n%s\n", desc.c_str());
return 0;
}
if (argc == 6)
{
printf("EmailServer : %s\n", argv[1]);
printf("To : %s\n", argv[2]);
printf("From : %s\n", argv[3]);
printf("Subject : %s\n", argv[4]);
printf("Message : %s\n", argv[5]);
printf("sending... ");
if (SendMail(argv[1], argv[2], argv[3], argv[4], argv[5]) == 0)
{
printf("Success.\n");
}
else
{
printf("Fail.\n");
}
}
return 0;
}