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 */ 45static void 46snmp_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 55err_t 56snmp_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 61u8_t 62snmp_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 */ 85void 86snmp_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