1 | /**
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2 | * @file
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3 | * SNMP RAW API frontend.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * Author: Dirk Ziegelmeier <dziegel@gmx.de>
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33 | */
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34 |
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35 | #include "lwip/apps/snmp_opts.h"
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36 | #include "lwip/ip_addr.h"
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37 |
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38 | #if LWIP_SNMP && SNMP_USE_RAW
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39 |
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40 | #include "lwip/udp.h"
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41 | #include "lwip/ip.h"
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42 | #include "lwip/prot/iana.h"
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43 | #include "snmp_msg.h"
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44 |
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45 | /* lwIP UDP receive callback function */
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46 | static void
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47 | snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
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48 | {
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49 | LWIP_UNUSED_ARG(arg);
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50 |
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51 | snmp_receive(pcb, p, addr, port);
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52 |
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53 | pbuf_free(p);
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54 | }
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55 |
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56 | err_t
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57 | snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port)
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58 | {
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59 | return udp_sendto((struct udp_pcb *)handle, p, dst, port);
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60 | }
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61 |
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62 | u8_t
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63 | snmp_get_local_ip_for_dst(void *handle, const ip_addr_t *dst, ip_addr_t *result)
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64 | {
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65 | struct udp_pcb *udp_pcb = (struct udp_pcb *)handle;
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66 | struct netif *dst_if;
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67 | const ip_addr_t *dst_ip;
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68 |
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69 | LWIP_UNUSED_ARG(udp_pcb); /* unused in case of IPV4 only configuration */
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70 |
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71 | ip_route_get_local_ip(&udp_pcb->local_ip, dst, dst_if, dst_ip);
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72 |
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73 | if ((dst_if != NULL) && (dst_ip != NULL)) {
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74 | ip_addr_copy(*result, *dst_ip);
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75 | return 1;
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76 | } else {
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77 | return 0;
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78 | }
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79 | }
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80 |
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81 | /**
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82 | * @ingroup snmp_core
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83 | * Starts SNMP Agent.
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84 | * Allocates UDP pcb and binds it to IP_ANY_TYPE port 161.
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85 | */
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86 | void
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87 | snmp_init(void)
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88 | {
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89 | err_t err;
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90 |
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91 | struct udp_pcb *snmp_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
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92 | LWIP_ERROR("snmp_raw: no PCB", (snmp_pcb != NULL), return;);
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93 |
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94 | LWIP_ASSERT_CORE_LOCKED();
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95 |
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96 | snmp_traps_handle = snmp_pcb;
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97 |
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98 | udp_recv(snmp_pcb, snmp_recv, NULL);
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99 | err = udp_bind(snmp_pcb, IP_ANY_TYPE, LWIP_IANA_PORT_SNMP);
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100 | LWIP_ERROR("snmp_raw: Unable to bind PCB", (err == ERR_OK), return;);
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101 | }
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102 |
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103 | #endif /* LWIP_SNMP && SNMP_USE_RAW */
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