/*

 *  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.

 *

 *  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.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 *

 *  Jabber

 *  Copyright (C) 1998-1999 The Jabber Team http://jabber.org/

 */

#include "jabber.h"

#include "connwrap.h"

/* local macros for launching event handlers */

#define STATE_EVT(arg) if(j->on_state) { (j->on_state)(j, (arg) ); }

/* prototypes of the local functions */

static void startElement(void *userdata, const char *name, const char **attribs);

static void endElement(void *userdata, const char *name);

static void charData(void *userdata, const char *s, int slen);

/*

 *  jab_new -- initialize a new jabber connection

 *

 *  parameters

 *      user -- jabber id of the user

 *      pass -- password of the user

 *

 *  results

 *      a pointer to the connection structure

 *      or NULL if allocations failed

 */

jconn jab_new(char *user, char *pass, int port, int ssl)

{

    pool p;

    jconn j;

    if(!user) return(NULL);

    p = pool_new();

    if(!p) return(NULL);

    j = pmalloc_x(p, sizeof(jconn_struct), 0);

    if(!j) return(NULL);

    j->p = p;

    j->user = jid_new(p, user);

    j->pass = pstrdup(p, pass);

    j->port = port;

    j->state = JCONN_STATE_OFF;

    j->cw_state = 0;

    j->id = 1;

    j->fd = -1;

    j->ssl = ssl;

    return j;

}

/*

 *  jab_delete -- free a jabber connection

 *

 *  parameters

 *      j -- connection

 *

 */

void jab_delete(jconn j)

{

    if(!j) return;

    jab_stop(j);

    pool_free(j->p);

}

/*

 *  jab_state_handler -- set callback handler for state change

 *

 *  parameters

 *      j -- connection

 *      h -- name of the handler function

 */

void jab_state_handler(jconn j, jconn_state_h h)

{

    if(!j) return;

    j->on_state = h;

}

/*

 *  jab_packet_handler -- set callback handler for incoming packets

 *

 *  parameters

 *      j -- connection

 *      h -- name of the handler function

 */

void jab_packet_handler(jconn j, jconn_packet_h h)

{

    if(!j) return;

    j->on_packet = h;

}

void jab_logger(jconn j, jconn_logger h)

{

    if(!j) return;

    j->logger = h;

}

/*

 *  jab_start -- start connection

 *

 *  parameters

 *      j -- connection

 *

 */

void jab_start(jconn j)

{

    xmlnode x;

    char *t,*t2;

    if(!j || (j->state != JCONN_STATE_OFF && j->state != JCONN_STATE_CONNECTING) ) return;

    if (!(j->cw_state & CW_CONNECT_WANT_SOMETHING)) { /* same as state != JCONN_STATE_CONNECTING */

	j->parser = XML_ParserCreate(NULL);

	XML_SetUserData(j->parser, (void *)j);

	XML_SetElementHandler(j->parser, startElement, endElement);

	XML_SetCharacterDataHandler(j->parser, charData);

	if (j->cw_state & CW_CONNECT_BLOCKING)

	    j->fd = make_netsocket(j->port, j->user->server, NETSOCKET_CLIENT, j->ssl);

	else

	    j->fd = make_nb_netsocket(j->port, j->user->server, NETSOCKET_CLIENT, j->ssl, &j->cw_state);

	if(j->fd < 0) {

	    STATE_EVT(JCONN_STATE_OFF);

	    return;

	}

    }

    else { /* subsequent calls to cw_nb_connect until it finishes negociation */

	if (cw_nb_connect(j->fd, 0, 0, j->ssl, &j->cw_state)) {

	    STATE_EVT(JCONN_STATE_OFF);

	    return;

	}

    }

    if (j->cw_state & CW_CONNECT_WANT_SOMETHING){ /* check if it finished negociation */

	j->state = JCONN_STATE_CONNECTING;

	STATE_EVT(JCONN_STATE_CONNECTING);

	return;

    }

    change_socket_to_blocking(j->fd);

    j->state = JCONN_STATE_CONNECTED;

    STATE_EVT(JCONN_STATE_CONNECTED)

    /* start stream */

    x = jutil_header(NS_CLIENT, j->user->server);

    t = xmlnode2str(x);

    /* this is ugly, we can create the string here instead of jutil_header */

    /* what do you think about it? -madcat */

    t2 = strstr(t,"/>");

    *t2++ = '>';

    *t2 = '\0';

    jab_send_raw(j,"<?xml version='1.0'?>");

    jab_send_raw(j,t);

    xmlnode_free(x);

    j->state = JCONN_STATE_ON;

    STATE_EVT(JCONN_STATE_ON)

}

/*

 *  jab_stop -- stop connection

 *

 *  parameters

 *      j -- connection

 */

void jab_stop(jconn j)

{

    if(!j || j->state == JCONN_STATE_OFF) return;

    j->state = JCONN_STATE_OFF;

    cw_close(j->fd);

    j->fd = -1;

    XML_ParserFree(j->parser);

}

/*

 *  jab_getfd -- get file descriptor of connection socket

 *

 *  parameters

 *      j -- connection

 *

 *  returns

 *      fd of the socket or -1 if socket was not connected

 */

int jab_getfd(jconn j)

{

    if(j)

	return j->fd;

    else

	return -1;

}

/*

 *  jab_getjid -- get jid structure of user

 *

 *  parameters

 *      j -- connection

 */

jid jab_getjid(jconn j)

{

    if(j)

	return(j->user);

    else

	return NULL;

}

/*  jab_getsid -- get stream id

 *  This is the id of server's <stream:stream> tag and used for

 *  digest authorization.

 *

 *  parameters

 *      j -- connection

 */

char *jab_getsid(jconn j)

{

    if(j)

	return(j->sid);

    else

	return NULL;

}

/*

 *  jab_getid -- get a unique id

 *

 *  parameters

 *      j -- connection

 */

char *jab_getid(jconn j)

{

    snprintf(j->idbuf, 8, "%d", j->id++);

    return &j->idbuf[0];

}

/*

 *  jab_send -- send xml data

 *

 *  parameters

 *      j -- connection

 *      x -- xmlnode structure

 */

void jab_send(jconn j, xmlnode x)

{

    if (j && j->state != JCONN_STATE_OFF)

    {

	    char *buf = xmlnode2str(x);

	    if (buf) {

		cw_write(j->fd, buf, strlen(buf), j->ssl);

		if (j->logger)

		    (j->logger)(j, 0, buf);

	    }

#ifdef JDEBUG

	    printf ("out: %s\n", buf);

#endif

    }

}

/*

 *  jab_send_raw -- send a string

 *

 *  parameters

 *      j -- connection

 *      str -- xml string

 */

void jab_send_raw(jconn j, const char *str)

{

    if (j && j->state != JCONN_STATE_OFF) {

	cw_write(j->fd, str, strlen(str), j->ssl);

	if (j->logger)

	    (j->logger)(j, 0, str);

    }

#ifdef JDEBUG

    printf ("out: %s\n", str);

#endif

}

/*

 *  jab_recv -- read and parse incoming data

 *

 *  parameters

 *      j -- connection

 */

void jab_recv(jconn j)

{

    static char buf[32768];

    int len;

    if(!j || j->state == JCONN_STATE_OFF)

	return;

    len = cw_read(j->fd, buf, sizeof(buf)-1, j->ssl);

    if(len>0)

    {

	buf[len] = '\0';

	if (j->logger)

	    (j->logger)(j, 1, buf);

#ifdef JDEBUG

	printf (" in: %s\n", buf);

#endif

	XML_Parse(j->parser, buf, len, 0);

    }

    else if(len<=0)

    {

	STATE_EVT(JCONN_STATE_OFF);

	jab_stop(j);

    }

}

/*

 *  jab_poll -- check socket for incoming data

 *

 *  parameters

 *      j -- connection

 *      timeout -- poll timeout

 */

void jab_poll(jconn j, int timeout)

{

    fd_set fds;

    struct timeval tv;

    int r;

    if (!j || j->state == JCONN_STATE_OFF)

	return;

    FD_ZERO(&fds);

    FD_SET(j->fd, &fds);

    if(timeout <= 0) {

	r = select(j->fd + 1, &fds, NULL, NULL, NULL);

    } else {

	tv.tv_sec = 0;

	tv.tv_usec = timeout;

	r = select(j->fd + 1, &fds, NULL, NULL, &tv);

    }

    if(r > 0) {

	jab_recv(j);

    } else if(r) {

	STATE_EVT(JCONN_STATE_OFF);

	jab_stop(j);

    }

}

/*

 *  jab_auth -- authorize user

 *

 *  parameters

 *      j -- connection

 *

 *  returns

 *      id of the iq packet

 */

char *jab_auth(jconn j)

{

    xmlnode x,y,z;

    char *hash, *user, *id;

    if(!j) return(NULL);

    x = jutil_iqnew(JPACKET__SET, NS_AUTH);

    id = jab_getid(j);

    xmlnode_put_attrib(x, "id", id);

    y = xmlnode_get_tag(x,"query");

    user = j->user->user;

    if (user)

    {

	z = xmlnode_insert_tag(y, "username");

	xmlnode_insert_cdata(z, user, -1);

    }

    z = xmlnode_insert_tag(y, "resource");

    xmlnode_insert_cdata(z, j->user->resource, -1);

    if (j->sid)

    {

	z = xmlnode_insert_tag(y, "digest");

	hash = pmalloc(x->p, strlen(j->sid)+strlen(j->pass)+1);

	strcpy(hash, j->sid);

	strcat(hash, j->pass);

	hash = shahash(hash);

	xmlnode_insert_cdata(z, hash, 40);

    }

    else

    {

	z = xmlnode_insert_tag(y, "password");

	xmlnode_insert_cdata(z, j->pass, -1);

    }

    jab_send(j, x);

    xmlnode_free(x);

    return id;

}

/*

 *  jab_reg -- register user

 *

 *  parameters

 *      j -- connection