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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 */
48 static void
snmp_netconn_thread(void * arg)49 snmp_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 
81 err_t
snmp_sendto(void * handle,struct pbuf * p,const ip_addr_t * dst,u16_t port)82 snmp_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 
94 u8_t
snmp_get_local_ip_for_dst(void * handle,const ip_addr_t * dst,ip_addr_t * result)95 snmp_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  */
116 void
snmp_init(void)117 snmp_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