///////////////////////////////////////////////////////////////////////
// FILE DESCRIPTION
//	Definitions for ssmtp.c
//
// VERSION
//	0.01 (2005/11/7)
//
// AUTHOR
//	Jerry Huang
///////////////////////////////////////////////////////////////////////

// debug message
//#define DEBUGMSG 1
#ifdef DEBUGMSG
	#define dbgmsg(args...) printf(args)
#else
	#define dbgmsg(args...)
#endif

// host name length for message id
#ifndef MAXHOSTNAMELEN
	#define MAXHOSTNAMELEN 64
#endif

// max reference id
#define NUMREFERENCES 4

// max data size
#define MAXDATASIZE	1024

// timeout in seconds for waiting response
#define SMTPTIMEOUT 5

// time delay for packet receive, microseconds
#define READ_DELAY 10000

// SMTP port
#define SMTPPORT 25

// SASL authentication mechanism
#define SASL_LOGIN		0	// AUTH LOGIN SASL mechanism
#define SASL_PLAIN		1	// AUTH PLAIN SASL mechanism
#define SASL_CRAMMD5	2	// AUTH CRAM-MD5 SASL mechanism
#define SASL_DEFAULT	1	// Set the default auth mechanism


// brief structure the server, and the connection socket
typedef struct SMTP_Client_Info
{
	char *host;			// Name of the relay host
	char *fromaddr;		// Address to use in the MAIL FROM command
	char *toaddr;
	char *domain;		// Domain to send in HELO/EHLO command
	char *auth_user;	// User to use in SASL authentication
	char *auth_pass;	// Password to use in SASL authentication
	int auth_mech;		// Mechanism to use in SASL authentication
	int port;			// Port to use to connect to the server
	int sockfd;			// Socket descriptor
	int num_rcpts;		// Number of recipients
#ifdef HAVE_SSL
	bool_t use_tls;		// Whether we should use SSL/TLS or not
	bool_t use_starttls;// Whether to use STARTTLS or not
	bool_t using_tls;	// Whether we started TLS or not
	SSL *ssl;			// SSL/TLS descriptor
#endif
}SMTP_Client_Info;


// system called error code
#define MEM_ALLOC_FAIL	1
#define SOCKET_FAIL		2
#define HOSTNAME_ERR	3
#define CONNECT_ERR		4
#define RECV_ERR		5
#define SEND_ERR		6
#define RECV_TIMEOUT	7
#define SMTP_FAILED		8
#define PIC_OPEN_ERR	9
#define TMP_OPEN_ERR	10
#define FILE_READ_ERR	11


// SMTP server response code
#define HELP_REPLY		"211"	// System status, or system help reply
#define HELP_MESSAGE	"214"	// Help message
#define SERVICE_READY	"220"	// <domain> Service ready
#define SERVICE_CLOSE1	"221"	// <domain> Service closing transmission channel
#define REPLY_OKAY		"250"	// Requested mail action okay, completed
#define USER_NOT_LOCAL1	"251"	// User not local; will forward to <forward-path>
#define VRFY_USER_ERR	"252"	// Cannot VRFY user, but will accept message and attempt delivery
#define MAIL_INPUT		"354"	// Start mail input; end with <CRLF>.<CRLF>
#define SERVICE_CLOSE2	"421" 	// <domain> Service not available, closing transmission channel
#define MAILBOX_BUSY	"450"	// Requested mail action not taken: mailbox unavailable
#define MAIL_ABORTED	"451"	// Requested action aborted: local error in processing
#define STORE_ERR		"452"	// Requested action not taken: insufficient system storage
#define SYNTAX_ERR		"500"	// Syntax error, command unrecognized
#define PARAM_ERR		"501"	// Syntax error in parameters or arguments
#define NO_COMMAND		"502"	// Command not implemented
#define BAD_SEQUENCE	"503"	// Bad sequence of commands
#define NO_PARAM		"504"	// Command parameter not implemented
#define NO_MAILBOX		"550"	// Requested action not taken: mailbox unavailable
#define USER_NOT_LOCAL2	"551"	// User not local; please try <forward-path>
#define NO_STORAGE		"552"	// Requested mail action aborted: exceeded storage allocation
#define MAILBOC_ERR		"553"	// Requested action not taken: mailbox name not allowed
#define NO_SMTP			"554" 	// Transaction failed  (Or, in the case of a connection-opening