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 "lwip/api.h"
40 #include "lwip/ip.h"
41 #include "lwip/udp.h"
42 #include "snmp_msg.h"
43 #include "lwip/sys.h"
44
45 /** SNMP netconn API worker thread */
46 static void
snmp_netconn_thread(void * arg)47 snmp_netconn_thread(void *arg)
48 {
49 struct netconn *conn;
50 struct netbuf *buf;
51 err_t err;
52 LWIP_UNUSED_ARG(arg);
53
54 /* Bind to SNMP port with default IP address */
55 #if LWIP_IPV6
56 conn = netconn_new(NETCONN_UDP_IPV6);
57 netconn_bind(conn, IP6_ADDR_ANY, SNMP_IN_PORT);
58 #else /* LWIP_IPV6 */
59 conn = netconn_new(NETCONN_UDP);
60 netconn_bind(conn, IP4_ADDR_ANY, SNMP_IN_PORT);
61 #endif /* LWIP_IPV6 */
62 LWIP_ERROR("snmp_netconn: invalid conn", (conn != NULL), return;);
63
64 snmp_traps_handle = conn;
65
66 do {
67 err = netconn_recv(conn, &buf);
68
69 if (err == ERR_OK) {
70 snmp_receive(conn, buf->p, &buf->addr, buf->port);
71 }
72
73 if (buf != NULL) {
74 netbuf_delete(buf);
75 }
76 } while(1);
77 }
78
79 err_t
snmp_sendto(void * handle,struct pbuf * p,const ip_addr_t * dst,u16_t port)80 snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port)
81 {
82 err_t result;
83 struct netbuf buf;
84
85 memset(&buf, 0, sizeof(buf));
86 buf.p = p;
87 result = netconn_sendto((struct netconn*)handle, &buf, dst, port);
88
89 return result;
90 }
91
92 u8_t
snmp_get_local_ip_for_dst(void * handle,const ip_addr_t * dst,ip_addr_t * result)93 snmp_get_local_ip_for_dst(void* handle, const ip_addr_t *dst, ip_addr_t *result)
94 {
95 struct netconn* conn = (struct netconn*)handle;
96 struct netif *dst_if;
97 const ip_addr_t* dst_ip;
98
99 LWIP_UNUSED_ARG(conn); /* unused in case of IPV4 only configuration */
100
101 ip_route_get_local_ip(&conn->pcb.udp->local_ip, dst, dst_if, dst_ip);
102
103 if ((dst_if != NULL) && (dst_ip != NULL)) {
104 ip_addr_copy(*result, *dst_ip);
105 return 1;
106 } else {
107 return 0;
108 }
109 }
110
111 /**
112 * Starts SNMP Agent.
113 */
114 void
snmp_init(void)115 snmp_init(void)
116 {
117 sys_thread_new("snmp_netconn", snmp_netconn_thread, NULL, SNMP_STACK_SIZE, SNMP_THREAD_PRIO);
118 }
119
120 #endif /* LWIP_SNMP && SNMP_USE_NETCONN */
121