/*
 * ipp.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-18 - ntop.org
 *
 * This file is part of nDPI, an open source deep packet inspection
 * library based on the OpenDPI and PACE technology by ipoque GmbH
 *
 * nDPI is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nDPI 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_IPP

#include "ndpi_api.h"


static void ndpi_int_ipp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
        struct ndpi_flow_struct *flow/* , ndpi_protocol_type_t protocol_type */)
{
    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IPP);
}

void ndpi_search_ipp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
    struct ndpi_packet_struct *packet = &flow->packet;
    u_int8_t i;

    NDPI_LOG_DBG(ndpi_struct, "search ipp\n");

    if (packet->payload_packet_len > 20) {

        NDPI_LOG_DBG2(ndpi_struct,
                "searching for a payload with a pattern like 'number(1to8)blanknumber(1to3)ipp://.\n");
        /* this pattern means that there is a printer saying that his state is idle,
         * means that he is not printing anything at the moment */
        i = 0;

        if (packet->payload[i] < '0' || packet->payload[i] > '9') {
            NDPI_LOG_DBG2(ndpi_struct, "payload does not begin with a number\n");
            goto search_for_next_pattern;
        }

        for (;;) {
            i++;
            if (!((packet->payload[i] >= '0' && packet->payload[i] <= '9') ||
                        (packet->payload[i] >= 'a' && packet->payload[i] <= 'f') ||
                        (packet->payload[i] >= 'A' && packet->payload[i] <= 'F')) || i > 8) {
                NDPI_LOG_DBG2(ndpi_struct,
                        "read symbols while the symbol is a number.\n");
                break;
            }
        }

        if (packet->payload[i++] != ' ') {
            NDPI_LOG_DBG2(ndpi_struct, "there is no blank following the number\n");
            goto search_for_next_pattern;
        }

        if (packet->payload[i] < '0' || packet->payload[i] > '9') {
            NDPI_LOG_DBG2(ndpi_struct, "no number following the blank\n");
            goto search_for_next_pattern;
        }

        for (;;) {
            i++;
            if (packet->payload[i] < '0' || packet->payload[i] > '9' || i > 12) {
                NDPI_LOG_DBG2(ndpi_struct,
                        "read symbols while the symbol is a number.\n");
                break;
            }
        }

        if (memcmp(&packet->payload[i], " ipp://", 7) != 0) {
            NDPI_LOG_DBG2(ndpi_struct, "the string ' ipp://' does not follow\n");
            goto search_for_next_pattern;
        }

        NDPI_LOG_INFO(ndpi_struct, "found ipp\n");
        ndpi_int_ipp_add_connection(ndpi_struct, flow);
        return;
    }

search_for_next_pattern:

    if (packet->payload_packet_len > 3 && memcmp(packet->payload, "POST", 4) == 0) {
        ndpi_parse_packet_line_info(ndpi_struct, flow);
        if (packet->content_line.ptr != NULL && packet->content_line.len > 14
                && memcmp(packet->content_line.ptr, "application/ipp", 15) == 0) {
            NDPI_LOG_INFO(ndpi_struct, "found ipp via POST ... application/ipp\n");
            ndpi_int_ipp_add_connection(ndpi_struct, flow);
            return;
        }
    }
    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}


void init_ipp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("IPP", ndpi_struct, detection_bitmask, *id,
            NDPI_PROTOCOL_IPP,
            ndpi_search_ipp,
            NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
            SAVE_DETECTION_BITMASK_AS_UNKNOWN,
            ADD_TO_DETECTION_BITMASK);

    *id += 1;
}
