Marco Zecchini
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Example_RTOS
Rtos API example
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lwip_snmp_raw.c
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00001 /** 00002 * @file 00003 * SNMP RAW API frontend. 00004 */ 00005 00006 /* 00007 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00008 * All rights reserved. 00009 * 00010 * Redistribution and use in source and binary forms, with or without modification, 00011 * are permitted provided that the following conditions are met: 00012 * 00013 * 1. Redistributions of source code must retain the above copyright notice, 00014 * this list of conditions and the following disclaimer. 00015 * 2. Redistributions in binary form must reproduce the above copyright notice, 00016 * this list of conditions and the following disclaimer in the documentation 00017 * and/or other materials provided with the distribution. 00018 * 3. The name of the author may not be used to endorse or promote products 00019 * derived from this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00022 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00024 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00026 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00029 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 * 00032 * Author: Dirk Ziegelmeier <dziegel@gmx.de> 00033 */ 00034 00035 #include "lwip/apps/snmp_opts.h" 00036 #include "lwip/ip_addr.h" 00037 00038 #if LWIP_SNMP && SNMP_USE_RAW 00039 00040 #include "lwip/udp.h" 00041 #include "lwip/ip.h" 00042 #include "snmp_msg.h" 00043 00044 /* lwIP UDP receive callback function */ 00045 static void 00046 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) 00047 { 00048 LWIP_UNUSED_ARG(arg); 00049 00050 snmp_receive(pcb, p, addr, port); 00051 00052 pbuf_free(p); 00053 } 00054 00055 err_t 00056 snmp_sendto(void *handle, struct pbuf *p, const ip_addr_t *dst, u16_t port) 00057 { 00058 return udp_sendto((struct udp_pcb*)handle, p, dst, port); 00059 } 00060 00061 u8_t 00062 snmp_get_local_ip_for_dst(void* handle, const ip_addr_t *dst, ip_addr_t *result) 00063 { 00064 struct udp_pcb* udp_pcb = (struct udp_pcb*)handle; 00065 struct netif *dst_if; 00066 const ip_addr_t* dst_ip; 00067 00068 LWIP_UNUSED_ARG(udp_pcb); /* unused in case of IPV4 only configuration */ 00069 00070 ip_route_get_local_ip(&udp_pcb->local_ip, dst, dst_if, dst_ip); 00071 00072 if ((dst_if != NULL) && (dst_ip != NULL)) { 00073 ip_addr_copy(*result, *dst_ip); 00074 return 1; 00075 } else { 00076 return 0; 00077 } 00078 } 00079 00080 /** 00081 * @ingroup snmp_core 00082 * Starts SNMP Agent. 00083 * Allocates UDP pcb and binds it to IP_ANY_TYPE port 161. 00084 */ 00085 void 00086 snmp_init(void) 00087 { 00088 err_t err; 00089 00090 struct udp_pcb *snmp_pcb = udp_new_ip_type(IPADDR_TYPE_ANY); 00091 LWIP_ERROR("snmp_raw: no PCB", (snmp_pcb != NULL), return;); 00092 00093 snmp_traps_handle = snmp_pcb; 00094 00095 udp_recv(snmp_pcb, snmp_recv, (void *)SNMP_IN_PORT); 00096 err = udp_bind(snmp_pcb, IP_ANY_TYPE, SNMP_IN_PORT); 00097 LWIP_ERROR("snmp_raw: Unable to bind PCB", (err == ERR_OK), return;); 00098 } 00099 00100 #endif /* LWIP_SNMP && SNMP_USE_RAW */
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