Я решил эту проблему.
После переключения Service Type в master.cf сокет появился по следующему пути
/var/spool/postfix/public/smpt
Код для подключения и отправки письма использовал следующий:
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <cstdlib>
#include <iostream>
#include <netdb.h>
#include <stdio.h>
#define DATA "Half a league, half a league . . ."
using namespace std;
#define HELO "HELO 192.168.1.1\r\n"
#define DATA "DATA\r\n"
#define QUIT "QUIT\r\n"
//#define h_addr h_addr_list[0]
//FILE *fin;
int sock;
struct sockaddr_un server;
struct hostent *hp, *gethostbyname();
char buf[BUFSIZ+1];
int len;
char *host_id="192.168.1.10";
char *from_id="rameshgoli@domain.com";
char *to_id="rameshgoli@domain.com";
char *sub="testmail\r\n";
char wkstr[100]="hello how r u\r\n";
/*=====Send a string to the socket=====*/
void send_socket(char *s)
{
write(sock,s,strlen(s));
write(1,s,strlen(s));
//printf("Client:%s\n",s);
}
//=====Read a string from the socket=====*/
void read_socket()
{
len = read(sock,buf,BUFSIZ);
write(1,buf,len);
//printf("Server:%s\n",buf);
}
/*=====MAIN=====*/
int main(int argc, char* argv[])
{
/*=====Create Socket=====*/
sock = socket(AF_UNIX, SOCK_STREAM, 0);;
if (sock==-1)
{
perror("opening stream socket");
exit(1);
}
else
cout << "socket created\n";
/*=====Verify host=====*/
server.sun_family = AF_UNIX;
strcpy(server.sun_path, "/var/spool/postfix/public/smtp");
if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0)
{
close(sock);
perror("connecting stream socket");
exit(1);
}
else
cout << "Connected\n";
/*=====Write some data then read some =====*/
read_socket(); /* SMTP Server logon string */
send_socket(HELO); /* introduce ourselves */
read_socket(); /*Read reply */
send_socket("MAIL FROM: ");
send_socket(from_id);
send_socket("\r\n");
read_socket(); /* Sender OK */
send_socket("VRFY ");
send_socket(from_id);
send_socket("\r\n");
read_socket(); // Sender OK */
send_socket("RCPT TO: "); /*Mail to*/
send_socket(to_id);
send_socket("\r\n");
read_socket(); // Recipient OK*/
send_socket(DATA);// body to follow*/
send_socket("Subject: ");
send_socket(sub);
read_socket(); // Recipient OK*/
send_socket(wkstr);
send_socket(".\r\n");
read_socket();
send_socket(QUIT); /* quit */
read_socket(); // log off */
//=====Close socket and finish=====*/
close(sock);
exit(0);
}
