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104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/**
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* @file
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* SNMP RAW API frontend.
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Dirk Ziegelmeier <dziegel@gmx.de>
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*/
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#include "lwip/apps/snmp_opts.h"
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#include "lwip/ip_addr.h"
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#if LWIP_SNMP && SNMP_USE_RAW
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#include "lwip/udp.h"
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#include "lwip/ip.h"
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#include "lwip/prot/iana.h"
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#include "snmp_msg.h"
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/* lwIP UDP receive callback function */
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static void
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snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
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{
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LWIP_UNUSED_ARG(arg);
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snmp_receive(pcb, p, addr, port);
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pbuf_free(p);
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}
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err_t
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snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port)
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{
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return udp_sendto((struct udp_pcb *)handle, p, dst, port);
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}
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u8_t
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snmp_get_local_ip_for_dst(void *handle, const ip_addr_t *dst, ip_addr_t *result)
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{
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struct udp_pcb *udp_pcb = (struct udp_pcb *)handle;
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struct netif *dst_if;
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const ip_addr_t *dst_ip;
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LWIP_UNUSED_ARG(udp_pcb); /* unused in case of IPV4 only configuration */
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ip_route_get_local_ip(&udp_pcb->local_ip, dst, dst_if, dst_ip);
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if ((dst_if != NULL) && (dst_ip != NULL)) {
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ip_addr_copy(*result, *dst_ip);
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return 1;
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} else {
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return 0;
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}
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}
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/**
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* @ingroup snmp_core
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* Starts SNMP Agent.
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* Allocates UDP pcb and binds it to IP_ANY_TYPE port 161.
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*/
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void
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snmp_init(void)
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{
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err_t err;
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struct udp_pcb *snmp_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
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LWIP_ERROR("snmp_raw: no PCB", (snmp_pcb != NULL), return;);
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LWIP_ASSERT_CORE_LOCKED();
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snmp_traps_handle = snmp_pcb;
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udp_recv(snmp_pcb, snmp_recv, NULL);
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err = udp_bind(snmp_pcb, IP_ANY_TYPE, LWIP_IANA_PORT_SNMP);
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LWIP_ERROR("snmp_raw: Unable to bind PCB", (err == ERR_OK), return;);
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}
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#endif /* LWIP_SNMP && SNMP_USE_RAW */
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