*/
    packetlen = len + 4;
    maclen = scmac ? scmac->len : 0;

    /*
     * Adjust memory allocation if packet is too big.
     */
    if (pktin.maxlen < packetlen) {
	pktin.maxlen = packetlen;
	pktin.data = (pktin.data == NULL ? malloc(packetlen+APIEXTRA) :
	              realloc(pktin.data, packetlen+APIEXTRA));
    if (pktin.maxlen < packetlen+maclen) {
	pktin.maxlen = packetlen+maclen;
	pktin.data = (pktin.data == NULL ? malloc(pktin.maxlen+APIEXTRA) :
	              realloc(pktin.data, pktin.maxlen+APIEXTRA));
	if (!pktin.data)
	    fatalbox("Out of memory");
    }

    /*
     * Read and decrypt the remainder of the packet.
     */

    /*
     * So now create a channel with a session in it.
     */
    ssh2_pkt_init(SSH2_MSG_CHANNEL_OPEN);
    ssh2_pkt_addstring("session");
    ssh2_pkt_adduint32(100);           /* as good as any */
    ssh2_pkt_adduint32(0xFFFFFFFFUL);  /* very big window which we ignore */
    ssh2_pkt_adduint32(0xFFFFFFFFUL);  /* very big max pkt size */
    ssh2_pkt_adduint32(0x7FFFFFFFUL);  /* very big window which we ignore */
    ssh2_pkt_adduint32(0x7FFFFFFFUL);  /* very big max pkt size */
    ssh2_pkt_send();
    crWaitUntilV(ispkt);
    if (pktin.type != SSH2_MSG_CHANNEL_OPEN_CONFIRMATION) {
        fatalbox("Server refused to open a session");
        /* FIXME: error data comes back in FAILURE packet */
    }
    if (ssh2_pkt_getuint32() != 100) {