/****************************************************************************
* smtp.c
* smtp SMTP E-mail sender
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Heavily leveraged from uIP 1.0 which also has a BSD-like license:
*
* The Simple Mail Transfer Protocol (SMTP) as defined by RFC821 is
* the standard way of sending and transfering e-mail on the
* Internet. This simple example implementation is intended as an
* example of how to implement protocols in uIP, and is able to send
* out e-mail but has not been extensively tested.
*
* Author: Adam Dunkels <adam@dunkels.com>
* Copyright (c) 2004, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <semaphore.h>
#include <sys/socket.h>
#include <net/uip/uip.h>
#include <net/uip/smtp.h>
#include "netutil-strings.h"
#define SMTP_INPUT_BUFFER_SIZE 512
#define ISO_nl 0x0a
#define ISO_cr 0x0d
#define ISO_period 0x2e
#define ISO_2 0x32
#define ISO_3 0x33
#define ISO_4 0x34
#define ISO_5 0x35
/* This structure represents the state of a single SMTP transaction */
struct smtp_state
{
uint8 state;
boolean connected;
sem_t sem;
uip_ipaddr_t smtpserver;
char *localhostname;
char *to;
char *cc;
char *from;
char *subject;
char *msg;
int msglen;
int sentlen;
int textlen;
int sendptr;
char buffer[SMTP_INPUT_BUFFER_SIZE];
};
static inline int smtp_send_message(int sockfd, struct smtp_state *psmtp)
{
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (strncmp(psmtp->buffer, smtp_220, 3) != 0)
{
return ERROR;
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_helo, psmtp->localhostname);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_2)
{
return ERROR;
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_mail_from, psmtp->from);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_2)
{
return ERROR;
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_rcpt_to, psmtp->to);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_2)
{
return ERROR;
}
if (psmtp->cc != 0)
{
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_rcpt_to, psmtp->cc);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_2)
{
return ERROR;
}
}
if (send(sockfd, smtp_data, strlen(smtp_data), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_3)
{
return ERROR;
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_to, psmtp->to);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (psmtp->cc != 0)
{
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_to, psmtp->cc);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_from, psmtp->from);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
snprintf(psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, "%s%s\r\n", smtp_subject, psmtp->subject);
if (send(sockfd, psmtp->buffer, strlen(psmtp->buffer), 0) < 0)
{
return ERROR;
}
if (send(sockfd, psmtp->msg, psmtp->msglen, 0) < 0)
{
return ERROR;
}
if (send(sockfd, smtp_crnlperiodcrnl, strlen(smtp_crnlperiodcrnl), 0) < 0)
{
return ERROR;
}
if (recv(sockfd, psmtp->buffer, SMTP_INPUT_BUFFER_SIZE, 0) < 0)
{
return ERROR;
}
if (psmtp->buffer[0] != ISO_2)
{
return ERROR;
}
if (send(sockfd, smtp_quit, strlen(smtp_quit), 0) < 0)
{
return ERROR;
}
return OK;
}
/* Specificy an SMTP server and hostname.
*
* This function is used to configure the SMTP module with an SMTP
* server and the hostname of the host.
*
* lhostname The hostname of the uIP host.
*
* server A pointer to a 4-byte array representing the IP
* address of the SMTP server to be configured.
*/
void smtp_configure(void *handle, char *lhostname, void *server)
{
struct smtp_state *psmtp = (struct smtp_state *)handle;
psmtp->localhostname = lhostname;
uip_ipaddr_copy(psmtp->smtpserver, server);
}
/* Send an e-mail.
*
* to The e-mail address of the receiver of the e-mail.
* cc The e-mail address of the CC: receivers of the e-mail.
* from The e-mail address of the sender of the e-mail.
* subject The subject of the e-mail.
* msg The actual e-mail message.
* msglen The length of the e-mail message.
*/
int smtp_send(void *handle, char *to, char *cc, char *from, char *subject, char *msg, int msglen)
{
struct smtp_state *psmtp = (struct smtp_state *)handle;
struct sockaddr_in server;
int sockfd;
int ret;
/* Setup */
psmtp->connected = TRUE;
psmtp->to = to;
psmtp->cc = cc;
psmtp->from = from;
psmtp->subject = subject;
psmtp->msg = msg;
psmtp->msglen = msglen;
/* Create a socket */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
return ERROR;
}
/* Connect to server. First we have to set some fields in the
* 'server' structure. The system will assign me an arbitrary
* local port that is not in use.
*/
server.sin_family = AF_INET;
memcpy(&server.sin_addr.s_addr, &psmtp->smtpserver, sizeof(in_addr_t));
server.sin_port = HTONS(25);
if (connect(sockfd, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) < 0)
{
close(sockfd);
return ERROR;
}
/* Send the message */
ret = smtp_send_message(sockfd, psmtp);
close(sockfd);
return ret;
}
void *smtp_open(void)
{
/* Allocate the handle */
struct smtp_state *psmtp = (struct smtp_state *)malloc(sizeof(struct smtp_state));
if (psmtp)
{
/* Initialize the handle */
memset(psmtp, 0, sizeof(struct smtp_state));
(void)sem_init(&psmtp->sem, 0, 0);
}
return (void*)psmtp;
}
void smtp_close(void *handle)
{
struct smtp_state *psmtp = (struct smtp_state *)handle;
if (psmtp)
{
sem_destroy(&psmtp->sem);
free(psmtp);
}
}
