src/protocols/oscar/ft.c

/*
 * File transfer (OFT) and DirectIM (ODC).
 * (OSCAR File Transfer, Oscar Direct Connect(ion?)
 */

#define FAIM_INTERNAL

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <aim.h>

#ifndef _WIN32
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/utsname.h> /* for aim_directim_initiate */
#include <arpa/inet.h> /* for inet_ntoa */
#define G_DIR_SEPARATOR '/'
#endif

#ifdef _WIN32
#include "win32dep.h"
#endif

#define AIM_OFT_PROTO_OFFER          0x0101
#define AIM_OFT_PROTO_ACCEPT         0x0202
#define AIM_OFT_PROTO_RESUME         0x0205
#define AIM_OFT_PROTO_RESUMEACCEPT   0x0207
#define AIM_OFT_PROTO_ACK            0x0204

struct aim_filetransfer_priv {
	char sn[MAXSNLEN+1];
	char cookie[8];
	char ip[30];
	int state;
	struct aim_fileheader_t fh;
};

struct aim_directim_intdata {
	fu8_t cookie[8];
	char sn[MAXSNLEN+1];
	char ip[22];
};

static int listenestablish(fu16_t portnum);
static struct aim_fileheader_t *aim_oft_getfh(aim_bstream_t *bs);
static void oft_dirconvert(char *name);
static int aim_oft_buildheader(aim_bstream_t *bs, struct aim_fileheader_t *fh);
 
/**
 * aim_handlerendconnect - call this to accept OFT connections and set up the required structures
 * @sess: the session
 * @cur: the conn the incoming connection is on
 *
 * call this when you get an outstanding read on a conn with subtype
 * AIM_CONN_SUBTYPE_RENDEZVOUS_OUT, it will clone the current
 * &aim_conn_t and tweak things as appropriate. the new conn and the
 * listener conn are both returned to the client in the
 * %AIM_CB_FAM_OFT, %AIM_CB_OFT_<CLASS>INITIATE callback.
 */
faim_export int aim_handlerendconnect(aim_session_t *sess, aim_conn_t *cur)
{ 
	int acceptfd = 0;
	struct sockaddr cliaddr;
	int clilen = sizeof(cliaddr);
	int ret = 0;
	aim_conn_t *newconn;

	if ((acceptfd = accept(cur->fd, &cliaddr, &clilen)) == -1)
		return 0; /* not an error */

	if (cliaddr.sa_family != AF_INET) { /* just in case IPv6 really is happening */
		close(acceptfd);
		aim_conn_close(cur);
		return -1;
	} 

	if (!(newconn = aim_cloneconn(sess, cur))) {
		close(acceptfd);
		aim_conn_close(cur);
		return -1;
	}

	newconn->type = AIM_CONN_TYPE_RENDEZVOUS;
	newconn->fd = acceptfd;

	if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM) { 
		struct aim_directim_intdata *priv;
		aim_rxcallback_t userfunc;

		priv = (struct aim_directim_intdata *)(newconn->internal = cur->internal);
		cur->internal = NULL;

		snprintf(priv->ip, sizeof(priv->ip), "%s:%u", 
				inet_ntoa(((struct sockaddr_in *)&cliaddr)->sin_addr), 
				ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));

		if ((userfunc = aim_callhandler(sess, newconn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMINITIATE)))
			ret = userfunc(sess, NULL, newconn, cur);

	} else if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE) {
#if 0
		struct aim_filetransfer_priv *priv;
		aim_rxcallback_t userfunc;

		newconn->priv = cur->priv;
		cur->priv = NULL;
		priv = (struct aim_filetransfer_priv *)newconn->priv;

		snprintf(priv->ip, sizeof(priv->ip), "%s:%u", inet_ntoa(((struct sockaddr_in *)&cliaddr)->sin_addr), ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));

		if ((userfunc = aim_callhandler(sess, newconn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILEINITIATE)))
			ret = userfunc(sess, NULL, newconn, cur);
#endif
	} else if (newconn->subtype == AIM_CONN_SUBTYPE_OFT_SENDFILE) {
		struct aim_filetransfer_priv *ft;
		aim_rxcallback_t userfunc;

		/* The new conn automatically inherits the internal value
		 * of cur. */
		cur->internal = NULL;
		ft = (struct aim_filetransfer_priv *)newconn->internal;

		snprintf(ft->ip, sizeof(ft->ip), "%s:%u", inet_ntoa(((struct sockaddr_in *)&cliaddr)->sin_addr), ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));

		if ((userfunc = aim_callhandler(sess, newconn, AIM_CB_FAM_OFT, AIM_CB_OFT_SENDFILEINITIATE)))
			ret = userfunc(sess, NULL, newconn, cur);
	} else { 
		faimdprintf(sess, 1,"Got a Connection on a listener that's not Rendezvous Closing conn.\n");
		aim_conn_close(newconn);
		ret = -1;
	}

	return ret;
}

/**
 * aim_send_typing - send client-to-client typing notification over established connection
 * @sess: session to conn
 * @conn: directim connection
 * @typing: If true, notify user has started typing; if false, notify user has stopped.
 *
 * The connection must have been previously established.
 */
faim_export int aim_send_typing(aim_session_t *sess, aim_conn_t *conn, int typing)
{
	struct aim_directim_intdata *intdata = (struct aim_directim_intdata *)conn->internal;
	aim_frame_t *fr;
	aim_bstream_t *hdrbs;
	fu8_t *hdr;
	int hdrlen = 0x44;

	if (!sess || !conn || (conn->type != AIM_CONN_TYPE_RENDEZVOUS))
		return -EINVAL;

	if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x01, 0)))
		return -ENOMEM;
	memcpy(fr->hdr.rend.magic, "ODC2", 4);
	fr->hdr.rend.hdrlen = hdrlen;

	if (!(hdr = calloc(1, hdrlen))) {
		aim_frame_destroy(fr);
		return -ENOMEM;
	}

	hdrbs = &(fr->data);
	aim_bstream_init(hdrbs, hdr, hdrlen);

	aimbs_put16(hdrbs, 0x0006);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_putraw(hdrbs, intdata->cookie, 8);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put32(hdrbs, 0x00000000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);

	/* flags -- 0x000e for "started typing", 0x0002 for "stopped typing */
	aimbs_put16(hdrbs, ( typing ? 0x000e : 0x0002));

	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_putraw(hdrbs, sess->sn, strlen(sess->sn));
	
	aim_bstream_setpos(hdrbs, 52); /* bleeehh */

	aimbs_put8(hdrbs, 0x00);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put8(hdrbs, 0x00);

	/* end of hdr */

	aim_tx_enqueue(sess, fr);

	return 0;
} 

/**
 * aim_send_im_direct - send IM client-to-client over established connection
 * @sess: session to conn
 * @conn: directim connection
 * @msg: null-terminated string to send. 
 * @len: The length of the message to send, including binary data.
 * @encoding: 0 for ascii, 2 for Unicode, 3 for ISO 8859-1
 * 
 * Call this just like you would aim_send_im, to send a directim. You
 * _must_ have previously established the directim connection.
 */
faim_export int aim_send_im_direct(aim_session_t *sess, aim_conn_t *conn, const char *msg, int len, int encoding)
{
	struct aim_directim_intdata *intdata = (struct aim_directim_intdata *)conn->internal;
	aim_frame_t *fr;
	aim_bstream_t *hdrbs;
	int hdrlen = 0x44;
	fu8_t *hdr;

	if (!sess || !conn || !msg || (conn->type != AIM_CONN_TYPE_RENDEZVOUS)) 
		return -EINVAL; 

	if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x01, len)))
		return -ENOMEM;	

	memcpy(fr->hdr.rend.magic, "ODC2", 4);
	fr->hdr.rend.hdrlen = hdrlen;
	
	if (!(hdr = calloc(1, hdrlen + len))) {
		aim_frame_destroy(fr);
		return -ENOMEM;
	}

	hdrbs = &(fr->data);
	aim_bstream_init(hdrbs, hdr, hdrlen + len);

	aimbs_put16(hdrbs, 0x0006);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_putraw(hdrbs, intdata->cookie, 8);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put32(hdrbs, len);
	aimbs_put16(hdrbs, encoding);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	
	/* flags -- 0x000e for "started typing", 0x0002 for "stopped typing, 0x0000 for message */
	aimbs_put16(hdrbs, 0x0000);

	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_putraw(hdrbs, sess->sn, strlen(sess->sn));

	aim_bstream_setpos(hdrbs, 52); /* bleeehh */

	aimbs_put8(hdrbs, 0x00);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put16(hdrbs, 0x0000);
	aimbs_put8(hdrbs, 0x00);
	
	/* end of hdr2 */
	
#if 0 /* XXX this is how you send buddy icon info... */	
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x0008);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x000c);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x0000);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x1466);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x0001);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x2e0f);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0x393e);
	i += aimutil_put16(newpacket->hdr.oft.hdr2+i, 0xcac8);
#endif
	aimbs_putraw(hdrbs, msg, len);
	
	aim_tx_enqueue(sess, fr);
	
	return 0;
} 

static int getlocalip(fu8_t *ip)
{
	struct hostent *hptr;
	char localhost[129];

	/* XXX if available, use getaddrinfo() */
	/* XXX allow client to specify which IP to use for multihomed boxes */

	if (gethostname(localhost, 128) < 0)
		return -1;

	if (!(hptr = gethostbyname(localhost)))
		return -1;

	memcpy(ip, hptr->h_addr_list[0], 4);

	return 0;
}

/**
 * aim_directim_intitiate - For those times when we want to open up the directim channel ourselves.
 * @sess: your session,
 * @conn: the BOS conn,
 * @priv: a dummy priv value (we'll let it get filled in later) (if you pass a %NULL, we alloc one)
 * @destsn: the SN to connect to.
 *
 */
faim_export aim_conn_t *aim_directim_initiate(aim_session_t *sess, const char *destsn)
{ 
	aim_conn_t *newconn;
	aim_msgcookie_t *cookie;
	struct aim_directim_intdata *priv;
	int listenfd;
	fu16_t port = 4443;
	fu8_t localip[4];
	fu8_t ck[8];

	if (getlocalip(localip) == -1)
		return NULL;

	if ((listenfd = listenestablish(port)) == -1)
		return NULL;

	aim_request_directim(sess, destsn, localip, port, ck);

	cookie = (aim_msgcookie_t *)calloc(1, sizeof(aim_msgcookie_t));
	memcpy(cookie->cookie, ck, 8);
	cookie->type = AIM_COOKIETYPE_OFTIM;

	/* this one is for the cookie */
	priv = (struct aim_directim_intdata *)calloc(1, sizeof(struct aim_directim_intdata));

	memcpy(priv->cookie, ck, 8);
	strncpy(priv->sn, destsn, sizeof(priv->sn));
	cookie->data = priv;
	aim_cachecookie(sess, cookie);

	/* XXX switch to aim_cloneconn()? */
	if (!(newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS_OUT, NULL))) {
		close(listenfd);
		return NULL;
	}

	/* this one is for the conn */
	priv = (struct aim_directim_intdata *)calloc(1, sizeof(struct aim_directim_intdata));

	memcpy(priv->cookie, ck, 8);
	strncpy(priv->sn, destsn, sizeof(priv->sn));

	newconn->fd = listenfd;
	newconn->subtype = AIM_CONN_SUBTYPE_OFT_DIRECTIM;
	newconn->internal = priv;
	newconn->lastactivity = time(NULL);

	faimdprintf(sess, 2,"faim: listening (fd = %d, unconnected)\n", newconn->fd);

	return newconn;
}

/**
 * aim_sendfile_intitiate - For those times when we want to send the file ourselves.
 * @sess: your session,
 * @conn: the BOS conn,
 * @destsn: the SN to connect to.
 * @filename: the name of the files you want to send
 *
 */
faim_export aim_conn_t *aim_sendfile_initiate(aim_session_t *sess, const char *destsn, const char *filename, fu16_t numfiles, fu32_t totsize, char *cookret)
{ 
	aim_conn_t *newconn;
	aim_msgcookie_t *cookie;
	struct aim_filetransfer_priv *ft;
	int listenfd;

	/* XXX allow different ports */
	fu16_t port = 4443;
	fu8_t localip[4];
	fu8_t ck[8];

	if (getlocalip(localip) == -1)
		return NULL;

	if ((listenfd = listenestablish(port)) == -1)
		return NULL;

	aim_request_sendfile(sess, destsn, filename, numfiles, totsize, localip, port, ck);

	cookie = (aim_msgcookie_t *)calloc(1, sizeof(aim_msgcookie_t));
	memcpy(cookie->cookie, ck, 8);
	cookie->type = AIM_COOKIETYPE_OFTSEND;
	memcpy(cookret, ck, 8);

	/* this one is for the cookie */
	ft = (struct aim_filetransfer_priv *)calloc(1, sizeof(struct aim_filetransfer_priv));

	memcpy(ft->cookie, ck, 8);
	strncpy(ft->sn, destsn, sizeof(ft->sn));
	cookie->data = ft;
	aim_cachecookie(sess, cookie);

	if (!(newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS_OUT, NULL))) {
		close(listenfd);
		return NULL;
	}

	/* this one is for the conn */
	ft = (struct aim_filetransfer_priv *)calloc(1, sizeof(struct aim_filetransfer_priv));

	memcpy(ft->cookie, ck, 8);
	strncpy(ft->sn, destsn, sizeof(ft->sn));

	newconn->fd = listenfd;
	newconn->subtype = AIM_CONN_SUBTYPE_OFT_SENDFILE;
	newconn->internal = ft;
	newconn->lastactivity = time(NULL);

	faimdprintf(sess, 2,"faim: listening (fd = %d, unconnected)\n", newconn->fd);

	return newconn;
}

#if 0
/**
 * unsigned int aim_oft_listener_clean - close up old listeners
 * @sess: session to clean up in
 * @age: maximum age in seconds
 *
 * returns number closed, -1 on error.
 */
faim_export unsigned int aim_oft_listener_clean(aim_session_t *sess, time_t age)
{
	aim_conn_t *cur;
	time_t now;
	unsigned int hit = 0;

	if (!sess)
		return -1;
	now = time(NULL);

	for(cur = sess->connlist;cur; cur = cur->next)
		if (cur->type == AIM_CONN_TYPE_RENDEZVOUS_OUT) {
			if (cur->lastactivity < (now - age) ) {
				aim_conn_close(cur);
				hit++;
			}
		}
	return hit;
}
#endif

faim_export const char *aim_directim_getsn(aim_conn_t *conn)
{
	struct aim_directim_intdata *intdata;

	if (!conn)
		return NULL;

	if ((conn->type != AIM_CONN_TYPE_RENDEZVOUS) || 
			(conn->subtype != AIM_CONN_SUBTYPE_OFT_DIRECTIM))
		return NULL;

	if (!conn->internal)
		return NULL;

	intdata = (struct aim_directim_intdata *)conn->internal;

	return intdata->sn;
}

/**
 * aim_directim_connect - connect to buddy for directim
 * @sess: the session to append the conn to,
 * @sn: the SN we're connecting to
 * @addr: address to connect to
 *
 * This is a wrapper for aim_newconn.
 *
 * If addr is NULL, the socket is not created, but the connection is 
 * allocated and setup to connect.
 *
 */
faim_export aim_conn_t *aim_directim_connect(aim_session_t *sess, const char *sn, const char *addr, const fu8_t *cookie)
{ 
	aim_conn_t *newconn;
	struct aim_directim_intdata *intdata;

	if (!sess || !sn)
		return NULL;

	if (!(intdata = malloc(sizeof(struct aim_directim_intdata))))
		return NULL;
	memset(intdata, 0, sizeof(struct aim_directim_intdata));

	memcpy(intdata->cookie, cookie, 8);
	strncpy(intdata->sn, sn, sizeof(intdata->sn));
	if (addr)
		strncpy(intdata->ip, addr, sizeof(intdata->ip));

	/* XXX verify that non-blocking connects actually work */
	if (!(newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS, addr))) {
		free(intdata);
		return NULL;
	}

	if (!newconn) {
		free(intdata);
		return newconn;
	}

	newconn->subtype = AIM_CONN_SUBTYPE_OFT_DIRECTIM;
	newconn->internal = intdata;

	return newconn;
} 

/**
 * aim_directim_getconn - find a directim conn for buddy name
 * @sess: your session,
 * @name: the name to get,
 *
 * returns conn for directim with name, %NULL if none found. 
 *
 */
faim_export aim_conn_t *aim_directim_getconn(aim_session_t *sess, const char *name)
{
	aim_conn_t *cur;

	if (!sess || !name || !strlen(name))
		return NULL;

	for (cur = sess->connlist; cur; cur = cur->next) {
		struct aim_directim_intdata *intdata;
		
		if ((cur->type != AIM_CONN_TYPE_RENDEZVOUS) || (cur->subtype != AIM_CONN_SUBTYPE_OFT_DIRECTIM))
			continue;

		intdata = cur->internal;

		if (aim_sncmp(intdata->sn, name) == 0)
			break;
	}

	return cur;
} 

/**
 * aim_accepttransfer - accept a file transfer request
 * @sess: the session,
 * @conn: the BOS conn for the CAP reply
 * @sn: the screenname to send it to,
 * @cookie: the cookie used
 * @ip: the ip to connect to
 * @port: the port to use
 * @rendid: capability type (%AIM_CAPS_GETFILE or %AIM_CAPS_SENDFILE)
 *
 * @listingfiles: number of files to share
 * @listingtotsize: total size of shared files
 * @listingsize: length of the listing file(buffer)
 * @listingchecksum: checksum of the listing
 *
 * Returns new connection or %NULL on error.
 *
 * XXX this should take a struct.
 */
faim_export aim_conn_t *aim_accepttransfer(aim_session_t *sess, aim_conn_t *conn, const char *sn,
						const fu8_t *cookie, const fu8_t *ip, 
						fu16_t port, fu16_t rendid, ...)
{
	aim_frame_t *newpacket;
	aim_conn_t *newconn;
	struct aim_filetransfer_priv *priv;
	int i;
	char addr[21];

	if (!sess || !conn || !sn || !cookie || !ip) {
		return NULL;
	}

	/* OSCAR CAP accept packet */

	if (!(newpacket = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x0002, 10+8+2+1+strlen(sn)+4+2+8+16))) {
		return NULL;
	}

	aim_putsnac(&newpacket->data, 0x0004, 0x0006, 0x0000, sess->snacid_next);

	for (i = 0; i < 8; i++)
		aimbs_put8(&newpacket->data, cookie[i]);

	aimbs_put16(&newpacket->data, 0x0002);
	aimbs_put8(&newpacket->data, strlen(sn));
	aimbs_putraw(&newpacket->data, sn, strlen(sn));
	aimbs_put16(&newpacket->data, 0x0005);
	aimbs_put16(&newpacket->data, 0x001a);
	aimbs_put16(&newpacket->data, AIM_RENDEZVOUS_ACCEPT);

	for (i = 0; i < 8; i++) /* yes, again... */
		aimbs_put8(&newpacket->data, cookie[i]);

	aim_putcap(&newpacket->data, rendid);
	aim_tx_enqueue(sess, newpacket);

	snprintf(addr, sizeof(addr), "%s:%d", ip, port);
	newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS, addr);

	if (newconn->status & AIM_CONN_STATUS_CONNERR) {
		return NULL;
	}

	if (!newconn || (newconn->fd == -1)) {
		perror("aim_newconn");
	faimdprintf(sess, 2, "could not connect to %s (fd: %i)\n", ip, newconn?newconn->fd:0);
		return newconn;
	}

	priv = (struct aim_filetransfer_priv *)calloc(1, sizeof(struct aim_filetransfer_priv));

	memcpy(priv->cookie, cookie, 8);
	priv->state = 0;
	strncpy(priv->sn, sn, MAXSNLEN);
	strncpy(priv->ip, ip, sizeof(priv->ip));
	newconn->internal = (void *)priv;

	faimdprintf(sess, 2, "faim: connected to peer (fd = %d)\n", newconn->fd);

	if (rendid == AIM_CAPS_GETFILE) {
		return NULL; /* This should never happen for now. -- wtm */

#if 0
	struct aim_fileheader_t *fh;
	aim_frame_t *newoft;
	aim_msgcookie_t *cachedcook;
	/* XXX take the following parameters	fu16_t listingfiles, 
						fu16_t listingtotsize, 
						fu16_t listingsize, 
						fu32_t listingchecksum, */

	newconn->subtype = AIM_CONN_SUBTYPE_OFT_GETFILE;

	faimdprintf(sess, 2, "faim: getfile request accept\n");

	if (!(newoft = aim_tx_new(sess, newconn, AIM_FRAMETYPE_OFT, 0x1108, 0))) { 
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
		/* XXX: conn leak here */
		return NULL;
	} 

	memcpy(newoft->hdr.oft.magic, "OFT2", 4);
	newoft->hdr.oft.hdr2len = 0x100 - 8;

	if (!(fh = (struct aim_fileheader_t*)calloc(1, sizeof(struct aim_fileheader_t)))) {
		/* XXX: conn leak here */
		perror("calloc");
		return NULL;
	}

	fh->encrypt = 0x0000;
	fh->compress = 0x0000;
	fh->totfiles = listingfiles;
	fh->filesleft = listingfiles; /* is this right -- total parts and parts left?*/
	fh->totparts = 0x0001;
	fh->partsleft = 0x0001;
	fh->totsize = listingtotsize;
	fh->size = listingsize; /* ls -l listing.txt */
	fh->modtime = (int)time(NULL); /* we'll go with current time for now */
	fh->checksum = listingchecksum;
	fh->rfcsum = 0x00000000;
	fh->rfsize = 0x00000000;
	fh->cretime = 0x00000000;
	fh->rfcsum = 0x00000000;
	fh->nrecvd = 0x00000000;
	fh->recvcsum = 0x00000000;
	memset(fh->idstring, 0, sizeof(fh->idstring));
	strncpy(fh->idstring, "OFT_Windows ICBMFT V1.1 32", sizeof(fh->idstring));
	fh->flags = 0x02;
	fh->lnameoffset = 0x1a;
	fh->lsizeoffset = 0x10;
	memset(fh->dummy, 0, sizeof(fh->dummy));
	memset(fh->macfileinfo, 0, sizeof(fh->macfileinfo));

	/* we need to figure out these encodings for filenames */
	fh->nencode = 0x0000;
	fh->nlanguage = 0x0000;
	memset(fh->name, 0, sizeof(fh->name));
	strncpy(fh->name, "listing.txt", sizeof(fh->name));

	if (!(newoft->hdr.oft.hdr2 = (char *)calloc(1,newoft->hdr.oft.hdr2len))) {
		aim_frame_destroy(newoft);
		/* XXX: conn leak */
		perror("calloc (1)");
		return NULL;
	}

	memcpy(fh->bcookie, cookie, 8);

	if (!(aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, fh)))
		faimdprintf(sess, 1, "eek, bh fail!\n");

	aim_tx_enqueue(sess, newoft);

	if (!(cachedcook = (aim_msgcookie_t *)calloc(1, sizeof(aim_msgcookie_t)))) { 
		faimdprintf(sess, 1, "faim: accepttransfer: couldn't calloc cachedcook. yeep!\n");
		/* XXX: more cleanup, conn leak */
		perror("calloc (2)");
		return NULL;
	}

	memcpy(&(priv->fh), fh, sizeof(struct aim_fileheader_t));
	memcpy(cachedcook->cookie, cookie, 8);

	cachedcook->type = AIM_COOKIETYPE_OFTGET;
	/* XXX doesn't priv need to be copied so we don't
	 * double free? -- wtm
	 */
	cachedcook->data = (void *)priv;

	if (aim_cachecookie(sess, cachedcook) == -1)
		faimdprintf(sess, 1, "faim: ERROR caching message cookie\n");

	free(fh);
#endif

	} else if (rendid == AIM_CAPS_SENDFILE) {
		newconn->subtype = AIM_CONN_SUBTYPE_OFT_SENDFILE;
		priv->fh.recvcsum = 0xffff0000;
	} else {
		return NULL;
	}

	return newconn;
}

/* conn is a BOS connection over which to send the cancel msg */
faim_export int aim_canceltransfer(aim_session_t *sess, aim_conn_t *conn,
		const char *cookie, const char *sn, int rendid)
{
	aim_frame_t *newpacket;
	int i;

	if (!(newpacket = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x0002, 10+8+2+1+strlen(sn)+4+2+8+16))) {
		return 1;
	}

	aim_putsnac(&newpacket->data, 0x0004, 0x0006, 0x0000, sess->snacid_next);

	for (i = 0; i < 8; i++)
		aimbs_put8(&newpacket->data, cookie[i]);

	aimbs_put16(&newpacket->data, 0x0002);
	aimbs_put8(&newpacket->data, strlen(sn));
	aimbs_putraw(&newpacket->data, sn, strlen(sn));
	aimbs_put16(&newpacket->data, 0x0005);
	aimbs_put16(&newpacket->data, 0x001a);
	aimbs_put16(&newpacket->data, AIM_RENDEZVOUS_CANCEL);

	for (i = 0; i < 8; i++)
		aimbs_put8(&newpacket->data, cookie[i]);

	aim_putcap(&newpacket->data, rendid);
	aim_tx_enqueue(sess, newpacket);

	return 0;
}

/**
 * aim_getlisting(FILE *file) -- get an aim_fileheader_t for a given FILE*
 * @file is an opened listing file
 * 
 * returns a pointer to the filled-in fileheader_t
 *
 * Currently omits checksum. we'll fix this when AOL breaks us, i
 * guess.
 *
 */
faim_export struct aim_fileheader_t *aim_getlisting(aim_session_t *sess, FILE *file) 
{
	return NULL;
#if 0
	struct aim_fileheader_t *fh;
	u_long totsize = 0, size = 0, checksum = 0xffff0000;
	short totfiles = 0;
	char *linebuf, sizebuf[9];
	int linelength = 1024;

	/* XXX: if we have a line longer than 1024chars, God help us. */
	if ((linebuf = (char *)calloc(1, linelength)) == NULL ) {
		faimdprintf(sess, 2, "linebuf calloc failed\n");
		return NULL;
	}

	if (fseek(file, 0, SEEK_END) == -1) { /* use this for sanity check */
		perror("getlisting END1 fseek:");
		faimdprintf(sess, 2, "getlising fseek END1 error\n");
	}

	if ((size = ftell(file)) == -1) {
		perror("getlisting END1 getpos:");
		faimdprintf(sess, 2, "getlising getpos END1 error\n");
	}

	if (fseek(file, 0, SEEK_SET) != 0) {
		perror("getlesting fseek(SET):");
		faimdprintf(sess, 2, "faim: getlisting: couldn't seek to beginning of listing file\n");
	}

	memset(linebuf, 0, linelength);

	size = 0;

	while(fgets(linebuf, linelength, file)) {
		totfiles++;
		memset(sizebuf, 0, 9);

		size += strlen(linebuf);

		if (strlen(linebuf) < 23) {
			faimdprintf(sess, 2, "line \"%s\" too short. skipping\n", linebuf);
			continue;
		}

		if (linebuf[strlen(linebuf)-1] != '\n') {
			faimdprintf(sess, 2, "faim: OFT: getlisting -- hit EOF or line too long!\n");
		}

		memcpy(sizebuf, linebuf+17, 8);

		totsize += strtol(sizebuf, NULL, 10);
		memset(linebuf, 0, linelength);
	}

	if (fseek(file, 0, SEEK_SET) == -1) {
		perror("getlisting END2 fseek:");
		faimdprintf(sess, 2, "getlising fseek END2 error\n");
	}

	free(linebuf);

	/* we're going to ignore checksumming the data for now -- that
	 * requires walking the whole listing.txt. it should probably be
	 * done at register time and cached, but, eh. */

	if (!(fh = (struct aim_fileheader_t*)calloc(1, sizeof(struct aim_fileheader_t))))
		return NULL;

	fh->encrypt = 0x0000;
	fh->compress = 0x0000;
	fh->totfiles = totfiles;
	fh->filesleft = totfiles; /* is this right? */
	fh->totparts = 0x0001;
	fh->partsleft = 0x0001;
	fh->totsize = totsize;
	fh->size = size; /* ls -l listing.txt */
	fh->modtime = (int)time(NULL); /* we'll go with current time for now */
	fh->checksum = checksum; /* XXX: checksum ! */
	fh->rfcsum = 0x00000000;
	fh->rfsize = 0x00000000;
	fh->cretime = 0x00000000;
	fh->rfcsum = 0x00000000;
	fh->nrecvd = 0x00000000;
	fh->recvcsum = 0x00000000;

	/* memset(fh->idstring, 0, sizeof(fh->idstring)); */
	memcpy(fh->idstring, "OFT_Windows ICBMFT V1.1 32", sizeof(fh->idstring));
	memset(fh->idstring+strlen(fh->idstring), 0, sizeof(fh->idstring)-strlen(fh->idstring));

	fh->flags = 0x02;
	fh->lnameoffset = 0x1a;
	fh->lsizeoffset = 0x10;

	/* memset(fh->dummy, 0, sizeof(fh->dummy)); */
	memset(fh->macfileinfo, 0, sizeof(fh->macfileinfo));

	fh->nencode = 0x0000; /* we need to figure out these encodings for filenames */
	fh->nlanguage = 0x0000;

	/* memset(fh->name, 0, sizeof(fh->name)); */
	strncpy(fh->name, "listing.txt", sizeof(fh->name));
	memset(fh->name+strlen(fh->name), 0, 64-strlen(fh->name));

	faimdprintf(sess, 2, "faim: OFT: listing fh name %s / %s\n", fh->name, (fh->name+(strlen(fh->name))));
	return fh;
#endif
}

/**
 * aim_listenestablish - create a listening socket on a port.
 * @portnum: the port number to bind to.
 *
 * you need to call accept() when it's connected. returns your fd 
 *
 * XXX: give the client author the responsibility of setting up a
 * listener, then we no longer have a libfaim problem with broken
 * solaris *innocent smile* -jbm
 */
static int listenestablish(fu16_t portnum)
{
#if HAVE_GETADDRINFO
	int listenfd;
	const int on = 1;
	struct addrinfo hints, *res, *ressave;
	char serv[5];

	snprintf(serv, sizeof(serv), "%d", portnum);
	memset(&hints, 0, sizeof(struct addrinfo));
	hints.ai_flags = AI_PASSIVE;
	hints.ai_family = AF_UNSPEC;
	hints.ai_socktype = SOCK_STREAM;
	if (getaddrinfo(NULL /*any IP*/, serv, &hints, &res) != 0) {
		perror("getaddrinfo");
		return -1;
	} 
	ressave = res;
	do { 
		listenfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
		if (listenfd < 0)
			continue;
		setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
		if (bind(listenfd, res->ai_addr, res->ai_addrlen) == 0)
			break;
		/* success */
		close(listenfd);
	} while ( (res = res->ai_next) );

	if (!res)
		return -1;

	if (listen(listenfd, 1024)!=0) { 
		perror("listen");
		return -1;
	} 

	fcntl(listenfd, F_SETFL, O_NONBLOCK);

	freeaddrinfo(ressave);
	return listenfd;
#else
	int listenfd;
	const int on = 1;
	struct sockaddr_in sockin;

	if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		perror("socket(listenfd)");
		return -1;
	}

	if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) != 0) {
		perror("setsockopt(listenfd)");
		close(listenfd);
		return -1;
	} 

	memset(&sockin, 0, sizeof(struct sockaddr_in));
	sockin.sin_family = AF_INET;
	sockin.sin_port = htons(portnum);

	if (bind(listenfd, (struct sockaddr *)&sockin, sizeof(struct sockaddr_in)) != 0) {
		perror("bind(listenfd)");
		close(listenfd);
		return -1;
	}
	if (listen(listenfd, 4) != 0) {
		perror("listen(listenfd)");
		close(listenfd);
		return -1;
	}
	fcntl(listenfd, F_SETFL, O_NONBLOCK);
	return listenfd;
#endif
} 

static int getcommand_getfile(aim_session_t *sess, aim_conn_t *conn)
{
#if 0
	struct aim_filetransfer_priv *ft;
	aim_rxcallback_t userfunc;

	ft = conn->priv;
	if (ft->state == 2) {
		/* waiting on listing data */
		int ret = 0;
		char *listing;
		aim_frame_t *newoft;

		if (!(listing = malloc(ft->fh.size)))
			return -1;

		ft->state = 0;
		if (aim_recv(conn->fd, listing, ft->fh.size) != ft->fh.size)	
			faimdprintf(sess, 2, "OFT get: file %s was short. (0x%lx)\n", ft->fh.name, ft->fh.size);

		if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x120b, 0))) {
			faimdprintf(sess, 2, "faim: aim_get_command_rendezvous: getfile listing: tx_new OFT failed\n");
			free(listing);
			aim_conn_close(conn);
			return -1;
		}

		memcpy(newoft->hdr.oft.magic, "OFT2", 4);
		newoft->hdr.oft.hdr2len = 0x100 - 8;

		/* Protocol BS - set nrecvd to size of listing, recvcsum to listing checksum, flags to 0 */

		ft->fh.nrecvd = ft->fh.size;
		ft->fh.recvcsum = ft->fh.checksum;
		ft->fh.flags = 0;

		if (!(newoft->hdr.oft.hdr2 = (char *)calloc(1,newoft->hdr.oft.hdr2len))) {
			aim_frame_destroy(newoft);
			free(listing);
			return -1;
		}

		if (!(aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, &(ft->fh))))
			faimdprintf(sess, 2, "eek! bh fail listing\n");

		/* send the 120b */
		aim_tx_enqueue(sess, newoft);
		if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILELISTING)) )
			ret = userfunc(sess, NULL, conn, ft, listing);

		free(listing);
		return ret;
	}

	if (ft->state == 3) { 
		/* waiting on file data */
		if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILERECEIVE)) ) 
			return userfunc(sess, NULL, conn, ft->fh.name,
					ft->fh.size);
		return 0;
	}

	if (ft->state == 4) {
		if( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILESTATE4)) )
			return userfunc(sess, NULL, conn);
		aim_conn_close(conn);
		return 0;
	}	

	return 0;
#else
	return -1;
#endif
}

static void connclose_sendfile(aim_session_t *sess, aim_conn_t *conn)
{
	aim_msgcookie_t *cook;
	struct aim_filetransfer_priv *priv = (struct aim_filetransfer_priv *)conn->internal;

	cook = aim_uncachecookie(sess, priv->cookie, AIM_COOKIETYPE_OFTSEND);
	aim_cookie_free(sess, cook);

	return;
}

static void connkill_sendfile(aim_session_t *sess, aim_conn_t *conn)
{
	free(conn->internal);

	return;
}

static void connclose_getfile(aim_session_t *sess, aim_conn_t *conn)
{
#if 0
	aim_msgcookie_t *cook;
	struct aim_filetransfer_priv *priv = (struct aim_filetransfer_priv *)conn->priv;

	cook = aim_uncachecookie(sess, priv->cookie, AIM_COOKIETYPE_OFTGET);
	aim_cookie_free(sess, cook);
#endif
	return;
}

static void connkill_getfile(aim_session_t *sess, aim_conn_t *conn)
{
	
	free(conn->internal);

	return;
}

static void connclose_directim(aim_session_t *sess, aim_conn_t *conn)
{
	struct aim_directim_intdata *intdata = (struct aim_directim_intdata *)conn->internal;
	aim_msgcookie_t *cook;

	cook = aim_uncachecookie(sess, intdata->cookie, AIM_COOKIETYPE_OFTIM);
	aim_cookie_free(sess, cook);

	return;
}

static void connkill_directim(aim_session_t *sess, aim_conn_t *conn)
{
	
	free(conn->internal);

	return;
}

faim_internal void aim_conn_close_rend(aim_session_t *sess, aim_conn_t *conn)
{

	if (conn->type != AIM_CONN_TYPE_RENDEZVOUS)
		return;

	if (conn->subtype == AIM_CONN_SUBTYPE_OFT_SENDFILE)
		connclose_sendfile(sess, conn);
	else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE)
		connclose_getfile(sess, conn);
	else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM)
		connclose_directim(sess, conn);

	return;
}

faim_internal void aim_conn_kill_rend(aim_session_t *sess, aim_conn_t *conn)
{

	if (conn->type != AIM_CONN_TYPE_RENDEZVOUS)
		return;

	if (conn->subtype == AIM_CONN_SUBTYPE_OFT_SENDFILE)
		connkill_sendfile(sess, conn);
	else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE)
		connkill_getfile(sess, conn);
	else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM)
		connkill_directim(sess, conn);

	return;
}

static int handlehdr_directim(aim_session_t *sess, aim_conn_t *conn, aim_bstream_t *bs)
{
	aim_frame_t fr;
	aim_rxcallback_t userfunc;
	fu32_t payloadlength;
	fu16_t flags, encoding;
	char *snptr = NULL;

	fr.conn = conn;

	/* XXX ugly */
	aim_bstream_setpos(bs, 20);
	payloadlength = aimbs_get32(bs);

	aim_bstream_setpos(bs, 24);
	encoding = aimbs_get16(bs);

	aim_bstream_setpos(bs, 30);
	flags = aimbs_get16(bs);

	aim_bstream_setpos(bs, 36);
	/* XXX -create an aimbs_getnullstr function? */
	snptr = aimbs_getstr(bs, MAXSNLEN);

	faimdprintf(sess, 2, "faim: OFT frame: handlehdr_directim: %04x / %04x / %s\n", payloadlength, flags, snptr);

	if (flags & 0x0002) {
		int ret = 0;

		if (flags & 0x000c) {
			if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMTYPING)))
				ret = userfunc(sess, &fr, snptr, 1);
			return ret;
		}

		if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMTYPING)))
			ret = userfunc(sess, &fr, snptr, 0);

		return ret;

	} else if (((flags & 0x000f) == 0x0000) && payloadlength) {
		char *msg, *msg2;
		int ret = 0;
		int recvd = 0;
		int i;

		if (!(msg = calloc(1, payloadlength+1)))
			return -1;
		msg2 = msg;
		
		while (payloadlength - recvd) {
			if (payloadlength - recvd >= 1024)
				i = aim_recv(conn->fd, msg2, 1024);
			else 
				i = aim_recv(conn->fd, msg2, payloadlength - recvd);
			if (i <= 0) {
				free(msg);
				return -1;
			}
			recvd = recvd + i;
			msg2 = msg2 + i;
			if ((userfunc=aim_callhandler(sess, conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_IMAGETRANSFER)))
				userfunc(sess, &fr, snptr, (double)recvd / payloadlength);
		}
		
		if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_DIRECTIMINCOMING)) )
			ret = userfunc(sess, &fr, snptr, msg, payloadlength, encoding);

		free(msg);

		return ret;
	}

	return 0;
}

static int handlehdr_getfile_listing(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_filetransfer_priv *ft;
	struct aim_fileheader_t *fh;
	struct aim_msgcookie_t *cook;
	aim_frame_t *newoft;
	aim_rxcallback_t userfunc;

	faimdprintf(sess, 2,"faim: rend: fileget 0x1108\n");
	fh = aim_oft_getfh(hdr);

	faim_mutex_unlock(&conn->active);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET))) {
		free(fh);
		return -1;
	}

	ft = cook->data;

	/* we're waaaaiiiting.. for listing.txt */
	ft->state = 2;

	memcpy(&(ft->fh), fh, sizeof(struct aim_fileheader_t));
	free(fh);

	if(aim_cachecookie(sess, cook) == -1) {
		faimdprintf(sess, 1, "error caching cookie\n");
		return -1;
	}

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x1209, 0))) {
		aim_conn_close(conn);
		return -1;
	}

	memcpy(newoft->hdr.oft.magic, "OFT2", 4);
	newoft->hdr.oft.hdr2len = 0x100 - 8;

	if (!(newoft->hdr.oft.hdr2 = (char *)calloc(1,newoft->hdr.oft.hdr2len))) {
		newoft->lock = 0;
		aim_frame_destroy(newoft);
		return -1;
	}

	if (!(aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, &(ft->fh)))) {
		newoft->lock = 0;
		aim_frame_destroy(newoft);
		return -1;
	}

	newoft->lock = 0;
	aim_tx_enqueue(sess, newoft);
#endif
	return -1;
}

static int handlehdr_getfile_listing2(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_filetransfer_priv *ft;
	struct aim_fileheader_t *fh;
	struct aim_msgcookie_t *cook;
	int ret = 0;
	aim_rxcallback_t userfunc;
	
	fh = aim_oft_getfh(hdr);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET)))
		faimdprintf(sess, 2, "shit, no cookie in 0x1209. (%i/%s)going to crash..\n", AIM_COOKIETYPE_OFTGET, fh->bcookie);

	ft = cook->data;

	if (ft->fh.size != fh->size)
		faimdprintf(sess, 2, "hrm. ft->fh.size (%ld) != fh->size (%ld). um. using ft->fh.size\n", ft->fh.size, fh->size);

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILELISTINGREQ)))
		ret = userfunc(sess, NULL, conn, fh);

	faimdprintf(sess, 2, "faim: get_command_rendezvous: hit end of 1209\n");

	free(fh);

	return ret;
#else
	return -1;
#endif
}

static int handlehdr_getfile_listing3(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_filetransfer_priv *ft;
	struct aim_msgcookie_t *cook;
	struct aim_fileheader_t *fh;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(hdr);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET))) {
		free(fh);
		return -1;
	}

	free(fh);

	ft = cook->data;

	if (aim_cachecookie(sess, cook) == -1)
		return -1;

	if ((userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILELISTINGRXCONFIRM)))
		return userfunc(sess, NULL, conn);
#endif
	return -1;
}

static int handlehdr_getfile_request(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_filetransfer_priv *ft;
	aim_msgcookie_t *cook;
	struct aim_fileheader_t *fh;
	aim_frame_t *newoft;
	int i = 0;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(hdr);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET))) {
		free(fh);
		return -1;
	}

	ft = cook->data;
	memcpy(&(ft->fh), fh, sizeof(struct aim_fileheader_t));
	free(fh);

	aim_cachecookie(sess, cook);

	faimdprintf(sess, 2, "faim: fileget: %s seems to want %s\n", ft->sn, ft->fh.name);

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILEFILEREQ)) )
		i = userfunc(sess, NULL, conn, &(ft->fh), cook->cookie);

	if (i < 0)
		return i;

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x0101, 0))) {
		faimdprintf(sess, 2, "faim: send_final_transfer: tx_new OFT failed\n");
		return -1;
	}

	memcpy(newoft->hdr.oft.magic, "OFT2", 4);
	newoft->hdr.oft.hdr2len = 0x100 - 8;

	if (!(newoft->hdr.oft.hdr2 = calloc(1,newoft->hdr.oft.hdr2len))) {
		aim_frame_destroy(newoft);
		return -1;
	} 

	/* protocol BS: nrecvd, recvcsum to 0, flags to 0x20. */
	ft->fh.nrecvd = 0;
	ft->fh.recvcsum = 0;
	ft->fh.flags = 0x20;

	aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, &(ft->fh));

	aim_tx_enqueue(sess, newoft);

	faimdprintf(sess, 2, "faim: OFT: OFT file header enqueued.\n");

	return i;
#else
	return -1;
#endif
}

static int handlehdr_getfile_sending(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_fileheader_t *fh;
	struct aim_filetransfer_priv *ft;
	struct aim_msgcookie_t *cook;
	struct command_tx_struct *newoft;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(hdr);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET))) {
		free(fh);
		return -1;
	}

	free(fh);

	ft = cook->data;

	ft->state = 3;

	if (aim_cachecookie(sess, cook) == -1)
		return -1;

	faimdprintf(sess, 2, "faim: fileget: %s seems to want to send %s\n", ft->sn, ft->fh.name);

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x0202, 0))) {
		faimdprintf(sess, 2, "faim: send_final_transfer: tx_new OFT failed\n");
		return -1;
	}

	newoft->lock = 1;
	memcpy(newoft->hdr.oft.magic, "OFT2", 4);

	newoft->hdr.oft.hdr2len = 0x100 - 8;

	if (!(newoft->hdr.oft.hdr2 = calloc(1,newoft->hdr.oft.hdr2len))) {
		aim_frame_destroy(newoft);
		return -1;
	}

	aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, &(ft->fh));

	newoft->lock = 0;
	aim_tx_enqueue(sess, newoft);

	faimdprintf(sess, 2, "faim: OFT: OFT 0x0202 enqueued.\n");

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILEFILEREQ)) == NULL)
		return 1;
#else
	return -1;
#endif
}

/* We are receiving a file, and the buddy sent us this header describing
 * it.  We send back a similar header to confirm, then we're ready to
 * start reading the raw data.
 */
static int handlehdr_sendfile_sending(aim_session_t *sess, aim_conn_t *conn, aim_bstream_t *bs)
{
	struct aim_filetransfer_priv *ft;
	struct aim_fileheader_t *fh;
	aim_frame_t *newoft;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(bs);

	/* We receive a null cookie for the first file; we must fill
	 * it in to authenticate ourselves. -- wtm
	 */
	ft = conn->internal;
	memcpy(&(fh->bcookie), ft->cookie, 8);

	memcpy(&(ft->fh), fh, sizeof(struct aim_fileheader_t));
	free(fh);

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, AIM_OFT_PROTO_ACCEPT, 0))) {
		faimdprintf(sess, 2, "faim: send_final_transfer: tx_new OFT failed\n");
		return -1;
	}

	if (aim_oft_buildheader(&(newoft->data), &(ft->fh)) == -1) {
		return -1;
	}
	memcpy(newoft->hdr.rend.magic, "OFT2", 4);
	newoft->hdr.rend.hdrlen = aim_bstream_curpos(&newoft->data);

	aim_tx_enqueue(sess, newoft);

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_SENDFILEFILEREQ)) == NULL)
		return 1;

	{
		char *cur;
		/* Convert the directory separator: it is sent
		 * as ^A (0x01).
		 */
		while ((cur = strchr(ft->fh.name, 0x01))) {
			*cur = G_DIR_SEPARATOR;
		}
	}
	return userfunc(sess, NULL, conn, &(ft->fh));
}


/* 
 * These were originally described by Josh Myer:
 * http://www.geocrawler.com/archives/3/896/2000/9/0/4291064/
 * XXX this doesn't actually work yet
 * -- wtm
 */
static int handlehdr_sendfile_resume(aim_session_t *sess, aim_conn_t *conn, aim_bstream_t *bs) {
	aim_frame_t *newoft;
	aim_msgcookie_t *cook;
	struct aim_fileheader_t *fh;
	struct aim_filetransfer_priv *ft;

	fh = aim_oft_getfh(bs);
	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTSEND))) {
		free(fh);
		return -1;
	}
	ft = (struct aim_filetransfer_priv *)cook->data;

	ft->fh.nrecvd = fh->nrecvd;
	ft->fh.recvcsum = fh->recvcsum;
	strncpy(ft->fh.name, fh->name, sizeof(ft->fh.name));
	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x0106, 0))) {
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
		free(fh);
		return -1;
	}

	if (aim_oft_buildheader(&(newoft->data), &(ft->fh)) == -1) {
		aim_frame_destroy(newoft);
		free(fh);
		return -1;
	}
	memcpy(newoft->hdr.rend.magic, "OFT2", 4);
	newoft->hdr.rend.hdrlen = aim_bstream_curpos(&newoft->data);

	aim_tx_enqueue(sess, newoft);
	free(fh);

	return 0;
}

/* We are sending a file, and the buddy sent us this header indicating
 * that he or she is ready for the raw data.
 */
static int handlehdr_sendfile_recv(aim_session_t *sess, aim_conn_t *conn, aim_bstream_t *bs) {
	struct aim_fileheader_t *fh;
	aim_msgcookie_t *cook;
	int ret = 1;
	struct aim_filetransfer_priv *ft;
	aim_rxcallback_t userfunc;
	
	fh = aim_oft_getfh(bs);
	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTSEND))) {
		free(fh);
		return -1;
	}
	ft = (struct aim_filetransfer_priv *)cook->data;

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_SENDFILEFILESEND)) )
		ret = userfunc(sess, NULL, conn, &(ft->fh));

	free(fh);

	return ret;
}

static int handlehdr_getfile_recv(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_fileheader_t *fh;
	struct aim_msgcookie_t *cook;
	int ret = 1;
	aim_rxcallback_t userfunc;
	struct aim_filetransfer_priv *ft;

	fh = aim_oft_getfh(hdr);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTGET))) {
		free(fh);
		return -1;
	}

	ft = cook->data;

	faimdprintf(sess, 2, "faim: get_rend: looks like we're ready to send data.(oft 0x0202)\n");

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILEFILESEND)) )
		ret = userfunc(sess, NULL, conn, fh);

	free(fh);

	return ret;
#else
	return -1;
#endif
}

/* We just sent the raw data of a file, and the buddy sent us back this
 * header indicating that the transfer is complete.
 */
static int handlehdr_sendfile_finish(aim_session_t *sess, aim_conn_t *conn, aim_bstream_t *bs)
{
	struct aim_fileheader_t *fh;
	aim_msgcookie_t *cook;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(bs);

	if (!(cook = aim_checkcookie(sess, fh->bcookie, AIM_COOKIETYPE_OFTSEND))) {
		free(fh);
		return -1;
	}

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_SENDFILECOMPLETE)) )
		userfunc(sess, NULL, conn, fh->bcookie);

	free(fh);
	return 0;
}

static int handlehdr_getfile_finish(aim_session_t *sess, aim_conn_t *conn, fu8_t *hdr)
{
#if 0
	struct aim_fileheader_t *fh;
	aim_rxcallback_t userfunc;

	fh = aim_oft_getfh(hdr);

	faimdprintf(sess, 2, "faim: get_rend: looks like we're done with a transfer (oft 0x0204)\n");

	if ( (userfunc = aim_callhandler(sess, conn, AIM_CB_FAM_OFT, AIM_CB_OFT_GETFILECOMPLETE)) )
		userfunc(sess, NULL, conn, fh);

	free(fh);
#endif

	return -1;
}

faim_internal int aim_rxdispatch_rendezvous(aim_session_t *sess, aim_frame_t *fr)
{
	aim_conn_t *conn = fr->conn;
	aim_bstream_t *bs = &fr->data;
	int ret = -1;

	if (conn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE) {
		/* This should never happen. -- wtm */
		return getcommand_getfile(sess, conn);

	} else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_SENDFILE) {
		switch(fr->hdr.rend.type) {
			case AIM_OFT_PROTO_OFFER:
				ret = handlehdr_sendfile_sending(sess, conn, bs);
				break;
			case AIM_OFT_PROTO_RESUME:
				ret = handlehdr_sendfile_resume(sess, conn, bs);
				break;
			case AIM_OFT_PROTO_RESUMEACCEPT: /* like _ACCEPT */;
			case AIM_OFT_PROTO_ACCEPT:
				ret = handlehdr_sendfile_recv(sess, conn, bs);
				break;
			case AIM_OFT_PROTO_ACK:
				ret = handlehdr_sendfile_finish(sess, conn, bs);
				break;
			default:
				faimdprintf(sess, 2, "faim: OFT frame: uknown type %04x\n", fr->hdr.rend.type);
				ret = -1;
				break;
		}

	} else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_DIRECTIM) {
		if (fr->hdr.rend.type == 0x0001)
			ret = handlehdr_directim(sess, conn, bs);
		else
			faimdprintf(sess, 0, "faim: DIM frame: unknown type %04x\n", fr->hdr.rend.type);

	} else if (conn->subtype == AIM_CONN_SUBTYPE_OFT_GETFILE) {
		/* This _really_ shouldn't happen. :) -- wtm */
		char *hdr = NULL;
		int hdrtype = fr->hdr.rend.type;
		if (hdrtype == 0x1108) /* getfile listing.txt incoming tx->rx */
			ret = handlehdr_getfile_listing(sess, conn, hdr);
		else if (hdrtype == 0x1209) /* get file listing ack rx->tx */
			ret = handlehdr_getfile_listing2(sess, conn, hdr);
		else if (hdrtype == 0x120b) /* get file listing rx confirm */
			ret = handlehdr_getfile_listing3(sess, conn, hdr);
		else if (hdrtype == 0x120c) /* getfile request */
			ret = handlehdr_getfile_request(sess, conn, hdr);
		else if (hdrtype == 0x0101) /* getfile sending data */
			ret = handlehdr_getfile_sending(sess, conn, hdr);
		else if (hdrtype == 0x0202) /* getfile recv data */
			ret = handlehdr_getfile_recv(sess, conn, hdr);
		else if (hdrtype == 0x0204) /* getfile finished */
			ret = handlehdr_getfile_finish(sess, conn, hdr);
		else {
			faimdprintf(sess, 2,"faim: OFT frame: uknown type %04x\n", hdrtype);
			ret = -1;
		}
	}
	
	if (ret == -1)
		aim_conn_close(conn);

	return ret;
}

/**
 * aim_oft_getfh - extracts an &aim_fileheader_t from buffer hdr.
 * @bs: bstream to extract header from
 *
 * returns pointer to new struct on success; %NULL on error.
 *
 */
static struct aim_fileheader_t *aim_oft_getfh(aim_bstream_t *bs)
{
	struct aim_fileheader_t *fh;

	if (!(fh = calloc(1, sizeof(struct aim_fileheader_t))))
		return NULL;

	/* The bstream should be positioned after the hdrtype. */
	aimbs_getrawbuf(bs, fh->bcookie, 8);
	fh->encrypt = aimbs_get16(bs);
	fh->compress = aimbs_get16(bs);
	fh->totfiles = aimbs_get16(bs);
	fh->filesleft = aimbs_get16(bs);
	fh->totparts = aimbs_get16(bs);
	fh->partsleft = aimbs_get16(bs);
	fh->totsize = aimbs_get32(bs);
	fh->size = aimbs_get32(bs);
	fh->modtime = aimbs_get32(bs);
	fh->checksum = aimbs_get32(bs);
	fh->rfrcsum = aimbs_get32(bs);
	fh->rfsize = aimbs_get32(bs);
	fh->cretime = aimbs_get32(bs);
	fh->rfcsum = aimbs_get32(bs);
	fh->nrecvd = aimbs_get32(bs);
	fh->recvcsum = aimbs_get32(bs);
	aimbs_getrawbuf(bs, fh->idstring, 32);
	fh->flags = aimbs_get8(bs);
	fh->lnameoffset = aimbs_get8(bs);
	fh->lsizeoffset = aimbs_get8(bs);
	aimbs_getrawbuf(bs, fh->dummy, 69);
	aimbs_getrawbuf(bs, fh->macfileinfo, 16);
	fh->nencode = aimbs_get16(bs);
	fh->nlanguage = aimbs_get16(bs);
	aimbs_getrawbuf(bs, fh->name, 64); /* XXX */

	return fh;
} 

/**
 * aim_oft_checksum - calculate oft checksum of buffer
 * @buffer: buffer of data to checksum
 * @bufsize: size of buffer
 * @prevcheck: previous checksum
 *
 * Prevcheck should be 0xFFFF0000 for each new file; you can have this
 * checksum chunks of files in series if you just call it repeatedly in a
 * for(; ; ) loop and don't reset the checksum between each call. And you
 * thought we didn't care about you and your pathetic client's meomry
 * footprint ;^) 
 *
 * Thanks to Graham Booker for providing this improved checksum
 * routine, which is simpler and should be more accurate than Josh
 * Myer's original code. -- wtm
 *
 * This algorithim works every time I have tried it.  The other fails
 * sometimes.  So, AOL who thought this up?  It has got to be the weirdest
 * checksum I have ever seen.
 */
faim_export fu32_t aim_oft_checksum(const unsigned char *buffer, int bufferlen, int prevcheck) {
	fu32_t check = (prevcheck >> 16) & 0xffff, oldcheck;
	int i;
	unsigned short val;

	for (i=0; i<bufferlen; i++) {
		oldcheck = check;
		if (i&1) {
			val = buffer[i];
		} else {
			val = buffer[i] << 8;
		}
		check -= val;
		/* The follownig appears to be necessary.... It happens every once in a while and the checksum doesn't fail. */
		if (check > oldcheck) {
			check--;
		}
	}
	check = ((check & 0x0000ffff) + (check >> 16));
	check = ((check & 0x0000ffff) + (check >> 16));
	return check << 16;
}

faim_export fu32_t aim_update_checksum(aim_session_t *sess, aim_conn_t *conn,
		const unsigned char *buffer, int len) {
	struct aim_filetransfer_priv *ft = conn->internal;

	ft->fh.nrecvd += len;
	ft->fh.recvcsum = aim_oft_checksum(buffer, len, ft->fh.recvcsum);

	return 0;
}

/**
 * aim_oft_buildheader - fills a buffer with network-order fh data
 * @bs: bstream to fill -- automatically initialized
 * @fh: fh to get data from
 *
 * returns -1 on error.
 *
 */
static int aim_oft_buildheader(aim_bstream_t *bs, struct aim_fileheader_t *fh)
{ 
	fu8_t *hdr;

	if (!bs || !fh)
		return -1;


	if (!(hdr = (unsigned char *)calloc(1, 0x100 - 8))) {
		return -1;
	}
	aim_bstream_init(bs, hdr, 0x100 - 8);

	aimbs_putraw(bs, fh->bcookie, 8);
	aimbs_put16(bs, fh->encrypt);
	aimbs_put16(bs, fh->compress);
	aimbs_put16(bs, fh->totfiles);
	aimbs_put16(bs, fh->filesleft);
	aimbs_put16(bs, fh->totparts);
	aimbs_put16(bs, fh->partsleft);
	aimbs_put32(bs, fh->totsize);
	aimbs_put32(bs, fh->size);
	aimbs_put32(bs, fh->modtime);
	aimbs_put32(bs, fh->checksum);
	aimbs_put32(bs, fh->rfrcsum);
	aimbs_put32(bs, fh->rfsize);
	aimbs_put32(bs, fh->cretime);
	aimbs_put32(bs, fh->rfcsum);
	aimbs_put32(bs, fh->nrecvd);
	aimbs_put32(bs, fh->recvcsum);
	aimbs_putraw(bs, fh->idstring, 32);
	aimbs_put8(bs, fh->flags);
	aimbs_put8(bs, fh->lnameoffset);
	aimbs_put8(bs, fh->lsizeoffset);
	aimbs_putraw(bs, fh->dummy, 69);
	aimbs_putraw(bs, fh->macfileinfo, 16);
	aimbs_put16(bs, fh->nencode);
	aimbs_put16(bs, fh->nlanguage);
	aimbs_putraw(bs, fh->name, 64);

	/* XXX: Filenames longer than 64B */
	return 0;
}

/**
 * aim_getfile_intitiate - Request an OFT getfile session
 * @sess: your session,
 * @conn: the BOS conn,
 * @destsn is the SN to connect to.
 * 
 * returns a new &aim_conn_t on success, %NULL on error
 */
faim_export aim_conn_t *aim_getfile_initiate(aim_session_t *sess, aim_conn_t *conn, const char *destsn)
{ 
	return NULL;
#if 0
	struct command_tx_struct *newpacket;
	struct aim_conn_t *newconn;
	struct aim_filetransfer_priv *priv;
	struct aim_msgcookie_t *cookie;
	int curbyte, i, listenfd;
	short port = 4443;
	struct hostent *hptr;
	struct utsname myname;
	char cap[16];
	char d[4];

	/* Open our socket */

	if ( (listenfd = aim_listenestablish(port)) == -1)
		return NULL;

	/* get our local IP */

	if (uname(&myname) < 0)
		return NULL;
	if ( (hptr = gethostbyname(myname.nodename)) == NULL)
		return NULL;
	memcpy(&d, hptr->h_addr_list[0], 4);

	aim_putcap(cap, 16, AIM_CAPS_GETFILE);

	/* create the OSCAR packet */

	if (!(newpacket = aim_tx_new(sess, conn, AIM_FRAMETYPE_OSCAR, 0x0002, 10+8+2+1+strlen(destsn)+4+4+0x42)))
		return NULL;
	newpacket->lock = 1;

	/* lock struct */
	curbyte = 0;
	curbyte += aim_putsnac(newpacket->data+curbyte, 0x0004, 0x0006, 0x0000, sess->snac_nextid);

	/* XXX: check the cookie before commiting to using it */

	/* Generate a random message cookie
	 * This cookie needs to be alphanumeric and NULL-terminated to be TOC-compatible. */
	for (i=0; i<7; i++) 
		curbyte += aimutil_put8(newpacket->data+curbyte, 0x30 + ((u_char) random() % 10));

	curbyte += aimutil_put8(newpacket->data+curbyte, 0x00);

	/* grab all the data for cookie caching. */
 
	if (!(cookie = (struct aim_msgcookie_t *)calloc(1, sizeof(struct aim_msgcookie_t))))
		return NULL;
	memcpy(cookie->cookie, newpacket->data+curbyte-8, 8);
	cookie->type = AIM_COOKIETYPE_OFTGET;

	if (!(priv = (struct aim_filetransfer_priv *)calloc(1, sizeof(struct aim_filetransfer_priv))))
		return NULL;
	memcpy(priv->cookie, cookie, 8);
	memcpy(priv->sn, destsn, sizeof(priv->sn));
	memcpy(priv->fh.name, "listing.txt", strlen("listing.txt"));
	priv->state = 1;

	cookie->data = priv;

	aim_cachecookie(sess, cookie);

	/* Channel ID */
	curbyte += aimutil_put16(newpacket->data+curbyte,0x0002);

	/* Destination SN (prepended with byte length) */
	curbyte += aimutil_put8(newpacket->data+curbyte,strlen(destsn));
	curbyte += aimutil_putstr(newpacket->data+curbyte, destsn, strlen(destsn));
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0003);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0000);

	/* enTLV start */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0005);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0042);

	/* Flag data / ICBM Parameters? */
	curbyte += aimutil_put8(newpacket->data+curbyte, 0x00);
	curbyte += aimutil_put8(newpacket->data+curbyte, 0x00);

	/* Cookie */
	curbyte += aimutil_putstr(newpacket->data+curbyte, (char *)cookie, 8);

	/* Capability String */
	curbyte += aimutil_putstr(newpacket->data+curbyte, (char *)cap, 0x10);

	/* 000a/0002 : 0001 */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x000a);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0002);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0001);

	/* 0003/0004: IP address */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0003);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0004);
	for (i = 0; i < 4; i++)
	curbyte += aimutil_put8(newpacket->data+curbyte, d[i]);

	/* already in network byte order */
 
	/* 0005/0002: Port */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0005);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0002);
	curbyte += aimutil_put16(newpacket->data+curbyte, port);

	/* 000f/0000: ?? */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x000f);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x0000);

	/* 2711/000c: ?? */
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x2711);
	curbyte += aimutil_put16(newpacket->data+curbyte, 0x000c);
	curbyte += aimutil_put32(newpacket->data+curbyte, 0x00120001);

	for (i = 0; i < 0x000c - 4; i++)
		curbyte += aimutil_put8(newpacket->data+curbyte, 0x00);

	newpacket->commandlen = curbyte;
	newpacket->lock = 0;
	aim_tx_enqueue(sess, newpacket);

	/* allocate and set up our connection */

	i = fcntl(listenfd, F_GETFL, 0);
	fcntl(listenfd, F_SETFL, i | O_NONBLOCK);
	newconn = aim_newconn(sess, AIM_CONN_TYPE_RENDEZVOUS_OUT, NULL);

	if (!newconn){ 
		perror("aim_newconn");
		return NULL;
	}

	newconn->fd = listenfd;
	newconn->subtype = AIM_CONN_SUBTYPE_OFT_GETFILE;
	newconn->internal = priv;
	faimdprintf(sess, 2,"faim: listening (fd = %d, unconnected)\n", newconn->fd);

	return newconn;
#endif
}
 
/**
 * aim_oft_getfile_request - request a particular file over an established getfile connection
 * @sess: your session
 * @conn: the established OFT getfile connection
 * @name: filename to request
 * @size: size of the file 
 *
 *
 * returns -1 on error, 0 on successful enqueuing
 */
#if 0
faim_export int aim_oft_getfile_request(aim_session_t *sess, aim_conn_t *conn, const char *name, int size)
{
	aim_frame_t *newoft;
	struct aim_filetransfer_priv *ft;
	if (!sess || !conn || !conn->priv || !name)
		return -1;

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x120c, 0))) {
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
		return -1;
	}
	memcpy(newoft->hdr.oft.magic, "OFT2", 4);
	newoft->hdr.oft.hdr2len = 0x100 - 8;

	ft = (struct aim_filetransfer_priv *)conn->priv;
	ft->fh.filesleft = 1;
	ft->fh.totfiles = 1;
	ft->fh.totparts = 1;
	ft->fh.partsleft = 1;
	ft->fh.totsize = size;
	ft->fh.size = size;
	ft->fh.checksum = 0;
	memcpy(ft->fh.name, name, strlen(name));
	memset(ft->fh.name+strlen(name), 0, 1);

	if (!(newoft->hdr.oft.hdr2 = (unsigned char *)calloc(1,newoft->hdr.oft.hdr2len))) {
		aim_frame_destroy(newoft);
		return -1;
	}

	if (!(aim_oft_buildheader(newoft->hdr.oft.hdr2, &(ft->fh)))) {
		aim_frame_destroy(newoft);
		return -1;
	}

	aim_tx_enqueue(sess, newoft);
	return 0;
}
#endif

/* Identify a file that we are about to send by transmitting the
 * appropriate header.
 */
faim_export int aim_oft_sendfile_request(aim_session_t *sess, aim_conn_t *conn, const char *filename, int filesdone, int numfiles, int size, int totsize)
{
	aim_frame_t *newoft;
	aim_msgcookie_t *cook;
	struct aim_filetransfer_priv *ft = (struct aim_filetransfer_priv *)conn->internal;
	struct aim_fileheader_t *fh;

	if (!sess || !conn || !filename)
		return -1;

	if (!(fh = (struct aim_fileheader_t*)calloc(1, sizeof(struct aim_fileheader_t))))
		return -1;

#ifdef DUMB_OFT_CHECKSUM
	/* Yes, we are supposed to checksum the whole file before sending, and
	 * yes, it's dumb.  This is the only way to get some clients (such as
	 * Mac AIM v4.5.163) to successfully complete the transfer.  With
	 * the WinAIM clients, we seem to be able to get away with just
	 * setting the checksum to zero.
	 * -- wtm
	 */
	{
		int fd = open(filename, O_RDONLY);
		if (fd >= 0) {
			int bytes;
			char buf[1024];
			fh->checksum = 0xffff0000;
			while ((bytes = aim_recv(fd, buf, 1024)) > 0) {
				fh->checksum = aim_oft_checksum(buf, bytes, fh->checksum);
			}
		}
		close(fd);
	}
#else
	fh->checksum = 0x00000000;
#endif
	fh->encrypt = 0x0000;
	fh->compress = 0x0000;
	fh->totfiles = numfiles;
	fh->filesleft = numfiles - filesdone;
	fh->totparts = 0x0001; /* set to 0x0002 sending Mac resource forks */
	fh->partsleft = 0x0001;
	fh->totsize = totsize;
	fh->size = size;
	fh->modtime = (int)time(NULL); /* we'll go with current time for now */
	/* fh->checksum set above */
	fh->rfcsum = 0x00000000;
	fh->rfsize = 0x00000000;
	fh->cretime = 0x00000000;
	fh->rfcsum = 0x00000000;
	fh->nrecvd = 0x00000000; /* always zero initially */
	fh->recvcsum= 0x00000000; /* ditto */

	strncpy(fh->idstring, "OFT_Windows ICBMFT V1.1 32", sizeof(fh->idstring));
	fh->flags = 0x02;
	fh->lnameoffset = 0x1a;
	fh->lsizeoffset = 0x10;
	memset(fh->dummy, 0, sizeof(fh->dummy));
	memset(fh->macfileinfo, 0, sizeof(fh->macfileinfo));

	/* apparently 0 is ASCII, 2 is UCS-2 */
	/* it is likely that 3 is ISO 8859-1 */
	fh->nencode = 0x0000;
	fh->nlanguage = 0x0000;

	/* Convert the directory separator to ^A for portability. */
	strncpy(fh->name, filename, sizeof(fh->name));
	oft_dirconvert(fh->name);

	/* XXX we should normally send a null cookie here, and make
	 * the receiver fill it in for authentication -- wtm
	 */
	memcpy(fh->bcookie, ft->cookie, 8);

	if (!(cook = aim_checkcookie(sess, ft->cookie, AIM_COOKIETYPE_OFTSEND))) {
		return -1;
	}

	/* Update both headers to be safe. */
	memcpy(&(ft->fh), fh, sizeof(struct aim_fileheader_t));
	memcpy(&(((struct aim_filetransfer_priv *)cook->data)->fh), fh, sizeof(struct aim_fileheader_t));

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, AIM_OFT_PROTO_OFFER, 0))) {
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
		free(fh);
		return -1;
	}

	if (aim_oft_buildheader(&newoft->data, fh) == -1) {
		aim_frame_destroy(newoft);
		free(fh);
		return -1;
	}

	memcpy(newoft->hdr.rend.magic, "OFT2", 4);
	newoft->hdr.rend.hdrlen = aim_bstream_curpos(&newoft->data);

	aim_tx_enqueue(sess, newoft);
	free(fh);
	return 0;
}
 
/**
 * aim_oft_getfile_ack - acknowledge a getfile download as complete
 * @sess: your session
 * @conn: the getfile conn to send the ack over 
 *
 * Call this function after you have read all the data in a particular
 * filetransfer. Returns -1 on error, 0 on apparent success
 *
 */
faim_export int aim_oft_getfile_ack(aim_session_t *sess, aim_conn_t *conn) 
{
	return -EINVAL;
#if 0
	struct command_tx_struct *newoft;
	struct aim_filetransfer_priv *ft;

	if (!sess || !conn || !conn->priv)
		return -1;

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, 0x0202, 0))) {
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
	return -1;
	} 

	newoft->lock = 1;

	memcpy(newoft->hdr.oft.magic, "OFT2", 4);
	newoft->hdr.oft.hdr2len = 0x100-8;

	if (!(newoft->hdr.oft.hdr2 = (char *)calloc(1,newoft->hdr.oft.hdr2len))) { 
		newoft->lock = 0;
		aim_frame_destroy(newoft);
		return -1;
	}

	ft = (struct aim_filetransfer_priv *)conn->priv;

	if (!(aim_oft_buildheader((unsigned char *)newoft->hdr.oft.hdr2, &(ft->fh)))) {
		newoft->lock = 0;
		aim_frame_destroy(newoft);
		return -1;
	}

	newoft->lock = 0;
	aim_tx_enqueue(sess, newoft);
	return 0;
#endif
}
 
/**
 * aim_oft_end - end a getfile/sendfile.
 * @sess: your session
 * @conn: the getfile connection 
 *
 * call this before you close the getfile connection if you're on the
 * receiving/requesting end.
 */
faim_export int aim_oft_end(aim_session_t *sess, aim_conn_t *conn)
{
	aim_frame_t *newoft;
	struct aim_filetransfer_priv *ft;

	if (!sess || !conn || !conn->internal)
		return -1;

	if (!(newoft = aim_tx_new(sess, conn, AIM_FRAMETYPE_OFT, AIM_OFT_PROTO_ACK, 0))) {
		faimdprintf(sess, 2, "faim: aim_accepttransfer: tx_new OFT failed\n");
		return -1;
	}

	ft = (struct aim_filetransfer_priv *)conn->internal;
	ft->state = 4; /* no longer wanting data */
	ft->fh.flags = 0x21;

	if (aim_oft_buildheader(&(newoft->data), &(ft->fh)) == -1) {
		aim_frame_destroy(newoft);
		return -1;
	}
	memcpy(newoft->hdr.rend.magic, "OFT2", 4);
	newoft->hdr.rend.hdrlen = aim_bstream_curpos(&newoft->data);

	aim_tx_enqueue(sess, newoft);

	return 0;
}

/*
 * Convert the directory separator to ^A, which seems to be AOL's attempt at portability.
 */
static void oft_dirconvert(char *name) {
	char *c = name;
	while ((c = strchr(c, G_DIR_SEPARATOR)))
		*c = 0x01;
}