1 /**
2 * @file
3 * SNMP RAW API 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 #include "lwip/ip_addr.h"
37
38 #if LWIP_SNMP && SNMP_USE_RAW
39
40 #include "lwip/udp.h"
41 #include "lwip/ip.h"
42 #include "snmp_msg.h"
43
44 /* lwIP UDP receive callback function */
45 static void
snmp_recv(void * arg,struct udp_pcb * pcb,struct pbuf * p,const ip_addr_t * addr,u16_t port)46 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
47 {
48 LWIP_UNUSED_ARG(arg);
49
50 snmp_receive(pcb, p, addr, port);
51
52 pbuf_free(p);
53 }
54
55 err_t
snmp_sendto(void * handle,struct pbuf * p,const ip_addr_t * dst,u16_t port)56 snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port)
57 {
58 return udp_sendto((struct udp_pcb*)handle, p, dst, port);
59 }
60
61 u8_t
snmp_get_local_ip_for_dst(void * handle,const ip_addr_t * dst,ip_addr_t * result)62 snmp_get_local_ip_for_dst(void* handle, const ip_addr_t *dst, ip_addr_t *result)
63 {
64 struct udp_pcb* udp_pcb = (struct udp_pcb*)handle;
65 struct netif *dst_if;
66 const ip_addr_t* dst_ip;
67
68 LWIP_UNUSED_ARG(udp_pcb); /* unused in case of IPV4 only configuration */
69
70 ip_route_get_local_ip(&udp_pcb->local_ip, dst, dst_if, dst_ip);
71
72 if ((dst_if != NULL) && (dst_ip != NULL)) {
73 ip_addr_copy(*result, *dst_ip);
74 return 1;
75 } else {
76 return 0;
77 }
78 }
79
80 /**
81 * @ingroup snmp_core
82 * Starts SNMP Agent.
83 * Allocates UDP pcb and binds it to IP_ANY_TYPE port 161.
84 */
85 void
snmp_init(void)86 snmp_init(void)
87 {
88 err_t err;
89
90 struct udp_pcb *snmp_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
91 LWIP_ERROR("snmp_raw: no PCB", (snmp_pcb != NULL), return;);
92
93 snmp_traps_handle = snmp_pcb;
94
95 udp_recv(snmp_pcb, snmp_recv, (void *)SNMP_IN_PORT);
96 err = udp_bind(snmp_pcb, IP_ANY_TYPE, SNMP_IN_PORT);
97 LWIP_ERROR("snmp_raw: Unable to bind PCB", (err == ERR_OK), return;);
98 }
99
100 #endif /* LWIP_SNMP && SNMP_USE_RAW */
101