/* protocol.h -- client-side protocol abstraction
 *
 * Copyright (c) 1998-2003 Carnegie Mellon University.  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. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: protocol.h,v 1.5 2004/05/06 18:52:07 ken3 Exp $ */

#ifndef _INCLUDED_PROTOCOL_H
#define _INCLUDED_PROTOCOL_H

#include "saslclient.h"

enum {
    /* generic capabilities */
    CAPA_AUTH		= (1 << 0),
    CAPA_STARTTLS	= (1 << 1),

    /* IMAP capabilities */
    CAPA_IDLE		= (1 << 2),
    CAPA_MUPDATE	= (1 << 3),
    CAPA_MULTIAPPEND	= (1 << 4),

    /* LMTP capabilities */
    CAPA_PIPELINING	= (1 << 2),
    CAPA_IGNOREQUOTA	= (1 << 3)
};

#define MAX_CAPA 5

struct capa_t {
    const char *str;
    unsigned long flag;
};

struct protocol_t;

struct capa_cmd_t {
    const char *cmd;		/* [OPTIONAL] capability command string
				   (NULL = capabilities in banner) */
    const char *resp;		/* end of capability response */
    char *(*parse_mechlist)(const char *str, struct protocol_t *prot);
				/* [OPTIONAL] parse capability string,
				   returns space-separated list of mechs */
    struct capa_t capa[MAX_CAPA+1];/* capabilities to parse for
				      (MUST end with NULL entry) */
};

struct tls_cmd_t {
    const char *cmd;		/* tls command string */
    const char *ok;		/* start tls prompt */
    const char *fail;		/* failure response */
};

struct simple_cmd_t {
    const char *cmd;		/* command string */
    const char *resp;		/* success response */
};

struct protocol_t {
    const char *service;	/* INET service name */
    const char *sasl_service;	/* SASL service name */
    struct capa_cmd_t capa_cmd;
    struct tls_cmd_t tls_cmd;
    struct sasl_cmd_t sasl_cmd;
    struct simple_cmd_t ping_cmd;
    struct simple_cmd_t logout_cmd;
};

extern struct protocol_t protocol[];

enum {
    PROTOCOL_IMAP = 0,
    PROTOCOL_POP3,
    PROTOCOL_NNTP,
    PROTOCOL_LMTP,
    PROTOCOL_MUPDATE
};

#endif /* _INCLUDED_PROTOCOL_H */
