www.pudn.com > libsmtp.zip > libsmtp_connection.c
/*
libsmtp is a library to send mail via SMTP
Copyright © 2001 Kevin Read
This software is available under the GNU Lesser Public License as described
in the COPYING file.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Kevin Read
Thu Aug 16 2001 */
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "../config.h"
#include "libsmtp.h"
int libsmtp_connect (char *libsmtp_server, unsigned int libsmtp_port, unsigned int libsmtp_flags, struct libsmtp_session_struct *libsmtp_session)
{
int libsmtp_socket; /* The temporary socket handle */
int libsmtp_bytes_read=0; /* How many bytes read? */
struct hostent *libsmtp_mailhost; /* We need this to convert the hostname to an IP */
struct sockaddr_in libsmtp_sock; /* We need this for the connection */
gchar *libsmtp_temp_buffer[4096]; /* Temp string for reads and writes */
// char *libsmtp_search_buffer; /* Used for searching in strings */
GString *libsmtp_temp_gstring; /* Temp gstring */
/* We clear up the variable space and instantiate the GStrings */
bzero (libsmtp_temp_buffer, sizeof(libsmtp_temp_buffer));
libsmtp_temp_gstring = g_string_new (NULL);
/* We enter the connect stage now */
libsmtp_session->Stage = LIBSMTP_CONNECT_STAGE;
/* We need a socket anyway :) */
libsmtp_socket = socket (PF_INET, SOCK_STREAM, 0);
/* Socket ok? */
if (libsmtp_socket < 0)
{
libsmtp_session->ErrorCode = LIBSMTP_SOCKETNOCREATE;
return LIBSMTP_SOCKETNOCREATE;
}
/* Now we need to get the IP from the hostname... */
if ((libsmtp_mailhost=gethostbyname((const char *)libsmtp_server))==NULL)
{
/* printf ("Host %s not found with error ", libsmtp_server);
perror ("host"); */
libsmtp_session->ErrorCode = LIBSMTP_HOSTNOTFOUND;
close (libsmtp_socket);
libsmtp_session->socket=0;
return LIBSMTP_HOSTNOTFOUND;
}
/* This struct is needed for the connect call */
libsmtp_sock.sin_family = AF_INET;
libsmtp_sock.sin_addr = *(struct in_addr *)libsmtp_mailhost->h_addr;
if (!libsmtp_port)
libsmtp_sock.sin_port = htons (25);
else
libsmtp_sock.sin_port = htons (libsmtp_port);
/* Now we make the connection to the smart host on the specified port */
if (connect (libsmtp_socket, (struct sockaddr *) &libsmtp_sock, sizeof (libsmtp_sock) ) < 0)
{
libsmtp_session->ErrorCode = LIBSMTP_CONNECTERR;
close (libsmtp_socket);
libsmtp_session->socket=0;
return LIBSMTP_CONNECTERR;
}
/* Ok, lets set the session socket to the right handler */
libsmtp_session->socket = libsmtp_socket;
/* We enter the greet stage now */
libsmtp_session->Stage = LIBSMTP_GREET_STAGE;
/* Now we should read the mail servers greeting */
if (libsmtp_int_read (libsmtp_temp_gstring, libsmtp_session, 2))
return LIBSMTP_ERRORREADFATAL;
if (libsmtp_session->LastResponseCode != 220)
{
libsmtp_session->ErrorCode = LIBSMTP_NOTWELCOME;
close (libsmtp_session->socket);
libsmtp_session->socket=0;
return LIBSMTP_NOTWELCOME;
}
/* Now we need to know our hostname */
if (gethostname ((char *)libsmtp_temp_buffer, sizeof(libsmtp_temp_buffer)))
{
libsmtp_session->ErrorCode = LIBSMTP_WHATSMYHOSTNAME;
close (libsmtp_session->socket);
libsmtp_session->socket=0;
return LIBSMTP_WHATSMYHOSTNAME;
}
/* We enter the hello stage now */
libsmtp_session->Stage = LIBSMTP_HELLO_STAGE;
/* Ok, lets greet him back */
g_string_sprintf (libsmtp_temp_gstring, "EHLO %s\r\n", libsmtp_temp_buffer);
if (libsmtp_int_send (libsmtp_temp_gstring, libsmtp_session, 2))
return LIBSMTP_ERRORSENDFATAL;
/* After this he will send us his capabilities. He may not be able to
recognize EHLO though, so we have to send HELO instead. */
if (libsmtp_int_read (libsmtp_temp_gstring, libsmtp_session, 2))
return LIBSMTP_ERRORSENDFATAL;
if (libsmtp_session->LastResponseCode < 300)
{
/* Ok, he loves us. Lets parse the response for the capabilities. */
if (strstr (libsmtp_session->LastResponse->str, "8BITMIME"))
libsmtp_session->serverflags |= LIBSMTP_HAS_8BIT;
if (strstr (libsmtp_session->LastResponse->str, "PIPELINING"))
libsmtp_session->serverflags |= LIBSMTP_HAS_PIPELINING;
if (strstr (libsmtp_session->LastResponse->str, "DSN"))
libsmtp_session->serverflags |= LIBSMTP_HAS_DSN;
if (strstr (libsmtp_session->LastResponse->str, "STARTTLS"))
libsmtp_session->serverflags |= LIBSMTP_HAS_TLS;
if (strstr (libsmtp_session->LastResponse->str, "AUTH"))
libsmtp_session->serverflags |= LIBSMTP_HAS_AUTH;
if (strstr (libsmtp_session->LastResponse->str, "SIZE"))
libsmtp_session->serverflags |= LIBSMTP_HAS_SIZE;
if (strstr (libsmtp_session->LastResponse->str, "ETRN"))
libsmtp_session->serverflags |= LIBSMTP_HAS_ETRN;
if (strstr (libsmtp_session->LastResponse->str, "ENHANCEDSTATUSCODES"))
libsmtp_session->serverflags |= LIBSMTP_HAS_ENHANCEDSTATUSCODES;
/* Ok, now we're ready for business */
}
else
{
/* Ok, he doesn't understand EHLO, so we will send HELO instead */
g_string_sprintf (libsmtp_temp_gstring, "HELO %s\r\n", libsmtp_temp_buffer);
if (libsmtp_int_send (libsmtp_temp_gstring, libsmtp_session, 2))
return LIBSMTP_ERRORSENDFATAL;
/* Lets see if he likes us now. */
if (libsmtp_session->LastResponseCode > 299)
{
/* We are not welcome here it seems - I don't know if this is fatal
to SMTP transactions - FIXME */
libsmtp_session->ErrorCode=LIBSMTP_NOTWELCOME;
close (libsmtp_session->socket);
libsmtp_session->socket=0;
return LIBSMTP_NOTWELCOME;
}
/* All capabilities are at 0 - This server is really stupid i. e. Exchange */
}
/* Ok, we're ready now. The connection is set up. */
return LIBSMTP_NOERR;
}
int libsmtp_close (struct libsmtp_session_struct *libsmtp_session)
{
/* I just hope that there are no socket with fd 0 out there :) */
if (libsmtp_session->socket)
{
close (libsmtp_session->socket);
libsmtp_session->socket=0;
}
return LIBSMTP_NOERR;
}