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/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Helper functions for json.c                                              *
*                                                                           *
*  Copyright 2012-2012 Wilmer van der Gaast <wilmer@gaast.net>              *
*                                                                           *
*  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.,  *
*  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.              *
*                                                                           *
****************************************************************************/

#include <stdlib.h>
#include <string.h>
#include <glib.h>

#include "json_util.h"

json_value *json_o_get(const json_value *obj, const json_char *name)
{
	int i;

	if (!obj || obj->type != json_object) {
		return NULL;
	}

	for (i = 0; i < obj->u.object.length; ++i) {
		if (strcmp(obj->u.object.values[i].name, name) == 0) {
			return obj->u.object.values[i].value;
		}
	}

	return NULL;
}

const char *json_o_str(const json_value *obj, const json_char *name)
{
	json_value *ret = json_o_get(obj, name);

	if (ret && ret->type == json_string) {
		return ret->u.string.ptr;
	} else {
		return NULL;
	}
}

char *json_o_strdup(const json_value *obj, const json_char *name)
{
	json_value *ret = json_o_get(obj, name);

	if (ret && ret->type == json_string && ret->u.string.ptr) {
		return g_memdup(ret->u.string.ptr, ret->u.string.length + 1);
	} else {
		return NULL;
	}
}
gs { font-weight: bold } /* Generic.Strong */ .highlight .gu { color: #666666 } /* Generic.Subheading */ .highlight .gt { color: #aa0000 } /* Generic.Traceback */ .highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #008800 } /* Keyword.Pseudo */ .highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */ .highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */ .highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */ .highlight .na { color: #336699 } /* Name.Attribute */ .highlight .nb { color: #003388 } /* Name.Builtin */ .highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */ .highlight .no { color: #003366; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555555 } /* Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/*
 *  aim_rxqueue.c
 *
 * This file contains the management routines for the receive
 * (incoming packet) queue.  The actual packet handlers are in
 * aim_rxhandlers.c.
 */

#include <aim.h> 

#ifndef _WIN32
#include <sys/socket.h>
#endif

/*
 *
 */
int aim_recv(int fd, void *buf, size_t count)
{
	int left, cur; 

	for (cur = 0, left = count; left; ) {
		int ret;
		
		ret = recv(fd, ((unsigned char *)buf)+cur, left, 0);

		/* Of course EOF is an error, only morons disagree with that. */
		if (ret <= 0)
			return -1;

		cur += ret;
		left -= ret;
	}

	return cur;
}

/*
 * Read into a byte stream.  Will not read more than count, but may read
 * less if there is not enough room in the stream buffer.
 */
static int aim_bstream_recv(aim_bstream_t *bs, int fd, size_t count)
{
	int red = 0;

	if (!bs || (fd < 0) || (count < 0))
		return -1;
	
	if (count > (bs->len - bs->offset))
		count = bs->len - bs->offset; /* truncate to remaining space */

	if (count) {

		red = aim_recv(fd, bs->data + bs->offset, count);

		if (red <= 0)
			return -1;
	}

	bs->offset += red;

	return red;
}

int aim_bstream_init(aim_bstream_t *bs, guint8 *data, int len)
{
	
	if (!bs)
		return -1;

	bs->data = data;
	bs->len = len;
	bs->offset = 0;

	return 0;
}

int aim_bstream_empty(aim_bstream_t *bs)
{
	return bs->len - bs->offset;
}

int aim_bstream_curpos(aim_bstream_t *bs)
{
	return bs->offset;
}

int aim_bstream_setpos(aim_bstream_t *bs, int off)
{

	if (off > bs->len)
		return -1;

	bs->offset = off;

	return off;
}

void aim_bstream_rewind(aim_bstream_t *bs)
{

	aim_bstream_setpos(bs, 0);

	return;
}

int aim_bstream_advance(aim_bstream_t *bs, int n)
{

	if (aim_bstream_empty(bs) < n)
		return 0; /* XXX throw an exception */

	bs->offset += n;

	return n;
}

guint8 aimbs_get8(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 1)
		return 0; /* XXX throw an exception */
	
	bs->offset++;
	
	return aimutil_get8(bs->data + bs->offset - 1);
}

guint16 aimbs_get16(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 2)
		return 0; /* XXX throw an exception */
	
	bs->offset += 2;
	
	return aimutil_get16(bs->data + bs->offset - 2);
}

guint32 aimbs_get32(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 4)
		return 0; /* XXX throw an exception */
	
	bs->offset += 4;
	
	return aimutil_get32(bs->data + bs->offset - 4);
}

guint8 aimbs_getle8(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 1)
		return 0; /* XXX throw an exception */
	
	bs->offset++;
	
	return aimutil_getle8(bs->data + bs->offset - 1);
}

guint16 aimbs_getle16(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 2)
		return 0; /* XXX throw an exception */
	
	bs->offset += 2;
	
	return aimutil_getle16(bs->data + bs->offset - 2);
}

guint32 aimbs_getle32(aim_bstream_t *bs)
{
	
	if (aim_bstream_empty(bs) < 4)
		return 0; /* XXX throw an exception */
	
	bs->offset += 4;
	
	return aimutil_getle32(bs->data + bs->offset - 4);
}

int aimbs_put8(aim_bstream_t *bs, guint8 v)
{

	if (aim_bstream_empty(bs) < 1)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_put8(bs->data + bs->offset, v);

	return 1;
}

int aimbs_put16(aim_bstream_t *bs, guint16 v)
{

	if (aim_bstream_empty(bs) < 2)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_put16(bs->data + bs->offset, v);

	return 2;
}

int aimbs_put32(aim_bstream_t *bs, guint32 v)
{

	if (aim_bstream_empty(bs) < 4)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_put32(bs->data + bs->offset, v);

	return 1;
}

int aimbs_putle8(aim_bstream_t *bs, guint8 v)
{

	if (aim_bstream_empty(bs) < 1)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_putle8(bs->data + bs->offset, v);

	return 1;
}

int aimbs_putle16(aim_bstream_t *bs, guint16 v)
{

	if (aim_bstream_empty(bs) < 2)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_putle16(bs->data + bs->offset, v);

	return 2;
}

int aimbs_putle32(aim_bstream_t *bs, guint32 v)
{

	if (aim_bstream_empty(bs) < 4)
		return 0; /* XXX throw an exception */

	bs->offset += aimutil_putle32(bs->data + bs->offset, v);

	return 1;
}

int aimbs_getrawbuf(aim_bstream_t *bs, guint8 *buf, int len)
{

	if (aim_bstream_empty(bs) < len)
		return 0;

	memcpy(buf, bs->data + bs->offset, len);
	bs->offset += len;

	return len;
}

guint8 *aimbs_getraw(aim_bstream_t *bs, int len)
{
	guint8 *ob;

	if (!(ob = g_malloc(len)))
		return NULL;

	if (aimbs_getrawbuf(bs, ob, len) < len) {
		g_free(ob);
		return NULL;
	}

	return ob;
}

char *aimbs_getstr(aim_bstream_t *bs, int len)
{
	guint8 *ob;

	if (!(ob = g_malloc(len+1)))
		return NULL;

	if (aimbs_getrawbuf(bs, ob, len) < len) {
		g_free(ob);
		return NULL;
	}
	
	ob[len] = '\0';

	return (char *)ob;
}

int aimbs_putraw(aim_bstream_t *bs, const guint8 *v, int len)
{

	if (aim_bstream_empty(bs) < len)
		return 0; /* XXX throw an exception */

	memcpy(bs->data + bs->offset, v, len);
	bs->offset += len;

	return len;
}

int aimbs_putbs(aim_bstream_t *bs, aim_bstream_t *srcbs, int len)
{

	if (aim_bstream_empty(srcbs) < len)
		return 0; /* XXX throw exception (underrun) */

	if (aim_bstream_empty(bs) < len)
		return 0; /* XXX throw exception (overflow) */

	memcpy(bs->data + bs->offset, srcbs->data + srcbs->offset, len);
	bs->offset += len;
	srcbs->offset += len;

	return len;
}

/**
 * aim_frame_destroy - free aim_frame_t 
 * @frame: the frame to free  
 *
 * returns -1 on error; 0 on success.  
 *
 */
void aim_frame_destroy(aim_frame_t *frame)
{

	g_free(frame->data.data); /* XXX aim_bstream_free */

	g_free(frame);
} 


/*
 * Grab a single command sequence off the socket, and enqueue
 * it in the incoming event queue in a seperate struct.
 */
int aim_get_command(aim_session_t *sess, aim_conn_t *conn)
{
	guint8 flaphdr_raw[6];
	aim_bstream_t flaphdr;
	aim_frame_t *newrx;
	guint16 payloadlen;
	
	if (!sess || !conn)
		return 0;

	if (conn->fd == -1)
		return -1; /* its a aim_conn_close()'d connection */

	/* KIDS, THIS IS WHAT HAPPENS IF YOU USE CODE WRITTEN FOR GUIS IN A DAEMON!
	   
	   And wouldn't it make sense to return something that prevents this function
	   from being called again IMMEDIATELY (and making the program suck up all
	   CPU time)?...
	   
	if (conn->fd < 3)
		return 0;
	*/

	if (conn->status & AIM_CONN_STATUS_INPROGRESS)
		return aim_conn_completeconnect(sess, conn);

	aim_bstream_init(&flaphdr, flaphdr_raw, sizeof(flaphdr_raw));

	/*
	 * Read FLAP header.  Six bytes:
	 *    
	 *   0 char  -- Always 0x2a
	 *   1 char  -- Channel ID.  Usually 2 -- 1 and 4 are used during login.
	 *   2 short -- Sequence number 
	 *   4 short -- Number of data bytes that follow.
	 */
	if (aim_bstream_recv(&flaphdr, conn->fd, 6) < 6) {
		aim_conn_close(conn);
		return -1;
	}

	aim_bstream_rewind(&flaphdr);

	/*
	 * This shouldn't happen unless the socket breaks, the server breaks,
	 * or we break.  We must handle it just in case.
	 */
	if (aimbs_get8(&flaphdr) != 0x2a) {
		guint8 start;

		aim_bstream_rewind(&flaphdr);
		start = aimbs_get8(&flaphdr);
		imcb_error(sess->aux_data, "FLAP framing disrupted");
		aim_conn_close(conn);
		return -1;
	}	

	/* allocate a new struct */
	if (!(newrx = (aim_frame_t *)g_new0(aim_frame_t,1)))
		return -1;

	/* we're doing FLAP if we're here */
	newrx->hdrtype = AIM_FRAMETYPE_FLAP;
	
	newrx->hdr.flap.type = aimbs_get8(&flaphdr);
	newrx->hdr.flap.seqnum = aimbs_get16(&flaphdr);
	payloadlen = aimbs_get16(&flaphdr);

	newrx->nofree = 0; /* free by default */

	if (payloadlen) {
		guint8 *payload = NULL;

		if (!(payload = (guint8 *) g_malloc(payloadlen))) {
			aim_frame_destroy(newrx);
			return -1;
		}

		aim_bstream_init(&newrx->data, payload, payloadlen);

		/* read the payload */
		if (aim_bstream_recv(&newrx->data, conn->fd, payloadlen) < payloadlen) {
			aim_frame_destroy(newrx); /* free's payload */
			aim_conn_close(conn);
			return -1;
		}
	} else
		aim_bstream_init(&newrx->data, NULL, 0);


	aim_bstream_rewind(&newrx->data);

	newrx->conn = conn;

	newrx->next = NULL;  /* this will always be at the bottom */

	if (!sess->queue_incoming)
		sess->queue_incoming = newrx;
	else {
		aim_frame_t *cur;

		for (cur = sess->queue_incoming; cur->next; cur = cur->next)
			;
		cur->next = newrx;
	}

	newrx->conn->lastactivity = time(NULL);

	return 0;  
}

/*
 * Purge recieve queue of all handled commands (->handled==1).  Also
 * allows for selective freeing using ->nofree so that the client can
 * keep the data for various purposes.  
 *
 * If ->nofree is nonzero, the frame will be delinked from the global list, 
 * but will not be free'ed.  The client _must_ keep a pointer to the
 * data -- libfaim will not!  If the client marks ->nofree but
 * does not keep a pointer, it's lost forever.
 *
 */
void aim_purge_rxqueue(aim_session_t *sess)
{
	aim_frame_t *cur, **prev;

	for (prev = &sess->queue_incoming; (cur = *prev); ) {
		if (cur->handled) {

			*prev = cur->next;
			
			if (!cur->nofree)
				aim_frame_destroy(cur);

		} else
			prev = &cur->next;
	}

	return;
}

/*
 * Since aim_get_command will aim_conn_kill dead connections, we need
 * to clean up the rxqueue of unprocessed connections on that socket.
 *
 * XXX: this is something that was handled better in the old connection
 * handling method, but eh.
 */
void aim_rxqueue_cleanbyconn(aim_session_t *sess, aim_conn_t *conn)
{
	aim_frame_t *currx;

	for (currx = sess->queue_incoming; currx; currx = currx->next) {
		if ((!currx->handled) && (currx->conn == conn))
			currx->handled = 1;
	}	
	return;
}