1/**
2 * @file
3 * SNMP netconn frontend.
4 */
5
6/*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 *    this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 *    this list of conditions and the following disclaimer in the documentation
17 *    and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * Author: Dirk Ziegelmeier <dziegel@gmx.de>
33 */
34
35#include "lwip/apps/snmp_opts.h"
36
37#if LWIP_SNMP && SNMP_USE_NETCONN
38
39#include <string.h>
40#include "lwip/api.h"
41#include "lwip/ip.h"
42#include "lwip/udp.h"
43#include "snmp_msg.h"
44#include "lwip/sys.h"
45#include "lwip/prot/iana.h"
46
47/** SNMP netconn API worker thread */
48static void
49snmp_netconn_thread(void *arg)
50{
51  struct netconn *conn;
52  struct netbuf *buf;
53  err_t err;
54  LWIP_UNUSED_ARG(arg);
55
56  /* Bind to SNMP port with default IP address */
57#if LWIP_IPV6
58  conn = netconn_new(NETCONN_UDP_IPV6);
59  netconn_bind(conn, IP6_ADDR_ANY, LWIP_IANA_PORT_SNMP);
60#else /* LWIP_IPV6 */
61  conn = netconn_new(NETCONN_UDP);
62  netconn_bind(conn, IP4_ADDR_ANY, LWIP_IANA_PORT_SNMP);
63#endif /* LWIP_IPV6 */
64  LWIP_ERROR("snmp_netconn: invalid conn", (conn != NULL), return;);
65
66  snmp_traps_handle = conn;
67
68  do {
69    err = netconn_recv(conn, &buf);
70
71    if (err == ERR_OK) {
72      snmp_receive(conn, buf->p, &buf->addr, buf->port);
73    }
74
75    if (buf != NULL) {
76      netbuf_delete(buf);
77    }
78  } while (1);
79}
80
81err_t
82snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port)
83{
84  err_t result;
85  struct netbuf buf;
86
87  memset(&buf, 0, sizeof(buf));
88  buf.p = p;
89  result = netconn_sendto((struct netconn *)handle, &buf, dst, port);
90
91  return result;
92}
93
94u8_t
95snmp_get_local_ip_for_dst(void *handle, const ip_addr_t *dst, ip_addr_t *result)
96{
97  struct netconn *conn = (struct netconn *)handle;
98  struct netif *dst_if;
99  const ip_addr_t *dst_ip;
100
101  LWIP_UNUSED_ARG(conn); /* unused in case of IPV4 only configuration */
102
103  ip_route_get_local_ip(&conn->pcb.udp->local_ip, dst, dst_if, dst_ip);
104
105  if ((dst_if != NULL) && (dst_ip != NULL)) {
106    ip_addr_copy(*result, *dst_ip);
107    return 1;
108  } else {
109    return 0;
110  }
111}
112
113/**
114 * Starts SNMP Agent.
115 */
116void
117snmp_init(void)
118{
119  LWIP_ASSERT_CORE_LOCKED();
120  sys_thread_new("snmp_netconn", snmp_netconn_thread, NULL, SNMP_STACK_SIZE, SNMP_THREAD_PRIO);
121}
122
123#endif /* LWIP_SNMP && SNMP_USE_NETCONN */
124