| 1 | /*
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| 2 | * Copyright (c) 2009 Lukas Mejdrech
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libnet
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /** @file
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| 34 | * ICMP client interface implementation.
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| 35 | * @see icmp_client.h
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| 36 | */
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| 37 |
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| 38 | #include <icmp_client.h>
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| 39 | #include <icmp_header.h>
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| 40 | #include <packet_client.h>
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| 41 | #include <errno.h>
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| 42 | #include <sys/types.h>
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| 43 | #include <net/icmp_codes.h>
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| 44 | #include <net/packet.h>
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| 45 |
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| 46 | /** Processes the received packet prefixed with an ICMP header.
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| 47 | *
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| 48 | * @param[in] packet The received packet.
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| 49 | * @param[out] type The ICMP header type.
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| 50 | * @param[out] code The ICMP header code.
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| 51 | * @param[out] pointer The ICMP header pointer.
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| 52 | * @param[out] mtu The ICMP header MTU.
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| 53 | * @return The ICMP header length.
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| 54 | * @return Zero if the packet contains no data.
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| 55 | */
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| 56 | int icmp_client_process_packet(packet_t *packet, icmp_type_t *type,
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| 57 | icmp_code_t *code, icmp_param_t *pointer, icmp_param_t *mtu)
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| 58 | {
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| 59 | icmp_header_t *header;
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| 60 |
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| 61 | header = (icmp_header_t *) packet_get_data(packet);
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| 62 | if (!header ||
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| 63 | (packet_get_data_length(packet) < sizeof(icmp_header_t))) {
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| 64 | return 0;
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| 65 | }
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| 66 |
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| 67 | if (type)
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| 68 | *type = header->type;
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| 69 | if (code)
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| 70 | *code = header->code;
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| 71 | if (pointer)
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| 72 | *pointer = header->un.param.pointer;
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| 73 | if (mtu)
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| 74 | *mtu = header->un.frag.mtu;
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| 75 |
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| 76 | return sizeof(icmp_header_t);
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| 77 | }
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| 78 |
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| 79 | /** Returns the ICMP header length.
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| 80 | *
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| 81 | * @param[in] packet The packet.
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| 82 | * @return The ICMP header length in bytes.
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| 83 | */
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| 84 | size_t icmp_client_header_length(packet_t *packet)
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| 85 | {
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| 86 | if (packet_get_data_length(packet) < sizeof(icmp_header_t))
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| 87 | return 0;
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| 88 |
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| 89 | return sizeof(icmp_header_t);
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| 90 | }
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| 91 |
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| 92 | /** @}
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| 93 | */
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