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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "smtp.h"
#include <unistd.h>
#include <errno.h>
#include <debug.h>
typedef struct private_smtp_t private_smtp_t;
/**
* Private data of an smtp_t object.
*/
struct private_smtp_t {
/**
* Public smtp_t interface.
*/
smtp_t public;
/**
* file stream to SMTP server
*/
FILE *f;
};
/**
* Read the response code from an SMTP server
*/
static int read_response(private_smtp_t *this)
{
char buf[256], *end;
int res = 0;
while (TRUE)
{
if (!fgets(buf, sizeof(buf), this->f))
{
return 0;
}
res = strtol(buf, &end, 10);
switch (*end)
{
case '-':
continue;
case ' ':
case '\0':
case '\n':
break;
default:
return 0;
}
break;
}
return res;
}
/**
* write a SMTP command to the server, read response code
*/
static int write_cmd(private_smtp_t *this, char *fmt, ...)
{
char buf[256];
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (fprintf(this->f, "%s\n", buf) < 1)
{
DBG1(DBG_LIB, "sending SMTP command failed");
return 0;
}
return read_response(this);
}
METHOD(smtp_t, send_mail, bool,
private_smtp_t *this, char *from, char *to, char *subject, char *fmt, ...)
{
va_list args;
if (write_cmd(this, "MAIL FROM:<%s>", from) != 250)
{
DBG1(DBG_LIB, "SMTP MAIL FROM failed");
return FALSE;
}
if (write_cmd(this, "RCPT TO:<%s>", to) != 250)
{
DBG1(DBG_LIB, "SMTP RCPT TO failed");
return FALSE;
}
if (write_cmd(this, "DATA") != 354)
{
DBG1(DBG_LIB, "SMTP DATA failed");
return FALSE;
}
fprintf(this->f, "From: %s\n", from);
fprintf(this->f, "To: %s\n", to);
fprintf(this->f, "Subject: %s\n", subject);
fprintf(this->f, "\n");
va_start(args, fmt);
vfprintf(this->f, fmt, args);
va_end(args);
fprintf(this->f, "\n.\n");
return read_response(this) == 250;
}
METHOD(smtp_t, destroy, void,
private_smtp_t *this)
{
write_cmd(this, "QUIT");
fclose(this->f);
free(this);
}
/**
* See header
*/
smtp_t *smtp_create()
{
private_smtp_t *this;
struct sockaddr_in addr;
int s;
INIT(this,
.public = {
.send_mail = _send_mail,
.destroy = _destroy,
},
);
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
{
DBG1(DBG_LIB, "opening SMTP socket failed: %s", strerror(errno));
free(this);
return NULL;
}
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(25);
if (connect(s, (struct sockaddr*)&addr, sizeof(addr)) < 0)
{
DBG1(DBG_LIB, "connecting to SMTP server failed: %s", strerror(errno));
close(s);
free(this);
return NULL;
}
this->f = fdopen(s, "a+");
if (!this->f)
{
DBG1(DBG_LIB, "opening stream to SMTP server failed: %s",
strerror(errno));
close(s);
free(this);
return NULL;
}
if (read_response(this) != 220 ||
write_cmd(this, "EHLO localhost") != 250)
{
DBG1(DBG_LIB, "SMTP EHLO failed");
fclose(this->f);
free(this);
return NULL;
}
return &this->public;
}
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