385 lines
11 KiB
C
385 lines
11 KiB
C
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/**
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* @file
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* Ping sender module
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*
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*/
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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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* This file is part of the lwIP TCP/IP stack.
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*
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*/
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/**
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* This is an example of a "ping" sender (with raw API and socket API).
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* It can be used as a start point to maintain opened a network connection, or
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* like a network "watchdog" for your device.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
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#include "ping.h"
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#include "lwip/mem.h"
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#include "lwip/raw.h"
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#include "lwip/icmp.h"
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#include "lwip/netif.h"
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#include "lwip/sys.h"
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#include "lwip/timeouts.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/prot/ip4.h"
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#if PING_USE_SOCKETS
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#include "lwip/sockets.h"
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#include "lwip/inet.h"
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#include <string.h>
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#endif /* PING_USE_SOCKETS */
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/**
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* PING_DEBUG: Enable debugging for PING.
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*/
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#ifndef PING_DEBUG
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#define PING_DEBUG LWIP_DBG_ON
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#endif
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/** ping receive timeout - in milliseconds */
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#ifndef PING_RCV_TIMEO
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#define PING_RCV_TIMEO 1000
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#endif
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/** ping delay - in milliseconds */
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#ifndef PING_DELAY
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#define PING_DELAY 1000
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#endif
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/** ping identifier - must fit on a u16_t */
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#ifndef PING_ID
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#define PING_ID 0xAFAF
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#endif
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/** ping additional data size to include in the packet */
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#ifndef PING_DATA_SIZE
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#define PING_DATA_SIZE 32
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#endif
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/** ping result action - no default action */
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#ifndef PING_RESULT
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#define PING_RESULT(ping_ok)
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#endif
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/* ping variables */
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static const ip_addr_t *ping_target;
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u16_t ping_seq_num;
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#ifdef LWIP_DEBUG
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static u32_t ping_time;
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#endif /* LWIP_DEBUG */
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#if !PING_USE_SOCKETS
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static struct raw_pcb *ping_pcb;
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#endif /* PING_USE_SOCKETS */
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/** Prepare a echo ICMP request */
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void
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ping_prepare_echo(struct icmp_echo_hdr *iecho, u16_t len) {
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size_t i;
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size_t data_len = len - sizeof(struct icmp_echo_hdr);
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ICMPH_TYPE_SET(iecho, ICMP_ECHO);
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ICMPH_CODE_SET(iecho, 0);
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iecho->chksum = 0;
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iecho->id = PING_ID;
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iecho->seqno = lwip_htons(++ping_seq_num);
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/* fill the additional data buffer with some data */
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for (i = 0; i < data_len; i++) {
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((char *)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
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}
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iecho->chksum = inet_chksum(iecho, len);
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}
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#if PING_USE_SOCKETS
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/* Ping using the socket ip */
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err_t
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ping_send(int s, const ip_addr_t *addr) {
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int err;
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struct icmp_echo_hdr *iecho;
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struct sockaddr_storage to;
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size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
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LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff);
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#if LWIP_IPV6
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if (IP_IS_V6(addr) && !ip6_addr_isipv4mappedipv6(ip_2_ip6(addr))) {
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/* todo: support ICMP6 echo */
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return ERR_VAL;
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}
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#endif /* LWIP_IPV6 */
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iecho = (struct icmp_echo_hdr *)mem_malloc((mem_size_t)ping_size);
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if (!iecho) {
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return ERR_MEM;
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}
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ping_prepare_echo(iecho, (u16_t)ping_size);
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#if LWIP_IPV4
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if (IP_IS_V4(addr)) {
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struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
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to4->sin_len = sizeof(*to4);
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to4->sin_family = AF_INET;
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inet_addr_from_ip4addr(&to4->sin_addr, ip_2_ip4(addr));
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}
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#endif /* LWIP_IPV4 */
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#if LWIP_IPV6
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if (IP_IS_V6(addr)) {
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struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
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to6->sin6_len = sizeof(*to6);
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to6->sin6_family = AF_INET6;
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inet6_addr_from_ip6addr(&to6->sin6_addr, ip_2_ip6(addr));
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}
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#endif /* LWIP_IPV6 */
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err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr *)&to, sizeof(to));
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mem_free(iecho);
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return err ? ERR_OK : ERR_VAL;
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}
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static void
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ping_recv(int s) {
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char buf[64];
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int len;
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struct sockaddr_storage from;
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int fromlen = sizeof(from);
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while ((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *)&from, (socklen_t *)&fromlen)) > 0) {
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if (len >= (int)(sizeof(struct ip_hdr) + sizeof(struct icmp_echo_hdr))) {
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ip_addr_t fromaddr;
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memset(&fromaddr, 0, sizeof(fromaddr));
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#if LWIP_IPV4
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if (from.ss_family == AF_INET) {
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struct sockaddr_in *from4 = (struct sockaddr_in *)&from;
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inet_addr_to_ip4addr(ip_2_ip4(&fromaddr), &from4->sin_addr);
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IP_SET_TYPE_VAL(fromaddr, IPADDR_TYPE_V4);
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}
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#endif /* LWIP_IPV4 */
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#if LWIP_IPV6
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if (from.ss_family == AF_INET6) {
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struct sockaddr_in6 *from6 = (struct sockaddr_in6 *)&from;
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inet6_addr_to_ip6addr(ip_2_ip6(&fromaddr), &from6->sin6_addr);
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IP_SET_TYPE_VAL(fromaddr, IPADDR_TYPE_V6);
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}
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#endif /* LWIP_IPV6 */
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LWIP_DEBUGF(PING_DEBUG, ("ping: recv "));
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ip_addr_debug_print_val(PING_DEBUG, fromaddr);
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LWIP_DEBUGF(PING_DEBUG, (" %"U32_F " ms\n", (sys_now() - ping_time)));
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/* todo: support ICMP6 echo */
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#if LWIP_IPV4
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if (IP_IS_V4_VAL(fromaddr)) {
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struct ip_hdr *iphdr;
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struct icmp_echo_hdr *iecho;
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iphdr = (struct ip_hdr *)buf;
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iecho = (struct icmp_echo_hdr *)(buf + (IPH_HL(iphdr) * 4));
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if ((iecho->id == PING_ID) && (iecho->seqno == lwip_htons(ping_seq_num))) {
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/* do some ping result processing */
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PING_RESULT((ICMPH_TYPE(iecho) == ICMP_ER));
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return;
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} else {
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LWIP_DEBUGF(PING_DEBUG, ("ping: drop\n"));
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}
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}
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#endif /* LWIP_IPV4 */
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}
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fromlen = sizeof(from);
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}
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if (len == 0) {
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LWIP_DEBUGF(PING_DEBUG, ("ping: recv - %"U32_F " ms - timeout\n", (sys_now() - ping_time)));
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}
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/* do some ping result processing */
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PING_RESULT(0);
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}
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static void
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ping_thread(void *arg) {
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int s;
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int ret;
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#if LWIP_SO_SNDRCVTIMEO_NONSTANDARD
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int timeout = PING_RCV_TIMEO;
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#else
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struct timeval timeout;
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timeout.tv_sec = PING_RCV_TIMEO / 1000;
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timeout.tv_usec = (PING_RCV_TIMEO % 1000) * 1000;
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#endif
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LWIP_UNUSED_ARG(arg);
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#if LWIP_IPV6
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if (IP_IS_V4(ping_target) || ip6_addr_isipv4mappedipv6(ip_2_ip6(ping_target))) {
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s = lwip_socket(AF_INET6, SOCK_RAW, IP_PROTO_ICMP);
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} else {
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s = lwip_socket(AF_INET6, SOCK_RAW, IP6_NEXTH_ICMP6);
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}
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#else
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s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP);
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#endif
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if (s < 0) {
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return;
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}
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ret = lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
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LWIP_ASSERT("setting receive timeout failed", ret == 0);
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LWIP_UNUSED_ARG(ret);
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while (1) {
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if (ping_send(s, ping_target) == ERR_OK) {
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LWIP_DEBUGF(PING_DEBUG, ("ping: send "));
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ip_addr_debug_print(PING_DEBUG, ping_target);
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LWIP_DEBUGF(PING_DEBUG, ("\n"));
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#ifdef LWIP_DEBUG
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ping_time = sys_now();
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#endif /* LWIP_DEBUG */
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ping_recv(s);
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} else {
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LWIP_DEBUGF(PING_DEBUG, ("ping: send "));
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ip_addr_debug_print(PING_DEBUG, ping_target);
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LWIP_DEBUGF(PING_DEBUG, (" - error\n"));
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}
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sys_msleep(PING_DELAY);
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}
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}
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#else /* PING_USE_SOCKETS */
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/* Ping using the raw ip */
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static u8_t
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ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *addr) {
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struct icmp_echo_hdr *iecho;
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LWIP_UNUSED_ARG(arg);
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LWIP_UNUSED_ARG(pcb);
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LWIP_UNUSED_ARG(addr);
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LWIP_ASSERT("p != NULL", p != NULL);
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if ((p->tot_len >= (PBUF_IP_HLEN + sizeof(struct icmp_echo_hdr))) &&
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pbuf_remove_header(p, PBUF_IP_HLEN) == 0) {
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iecho = (struct icmp_echo_hdr *)p->payload;
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if ((iecho->id == PING_ID) && (iecho->seqno == lwip_htons(ping_seq_num))) {
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LWIP_DEBUGF(PING_DEBUG, ("ping: recv "));
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ip_addr_debug_print(PING_DEBUG, addr);
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LWIP_DEBUGF(PING_DEBUG, (" %"U32_F " ms\n", (sys_now() - ping_time)));
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/* do some ping result processing */
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PING_RESULT(1);
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pbuf_free(p);
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return 1; /* eat the packet */
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}
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/* not eaten, restore original packet */
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pbuf_add_header(p, PBUF_IP_HLEN);
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}
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return 0; /* don't eat the packet */
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}
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int
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ping_send(struct raw_pcb *raw, const ip_addr_t *addr) {
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struct pbuf *p;
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struct icmp_echo_hdr *iecho;
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size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
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LWIP_DEBUGF(PING_DEBUG, ("ping: send "));
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ip_addr_debug_print(PING_DEBUG, addr);
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LWIP_DEBUGF(PING_DEBUG, ("\n"));
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LWIP_ASSERT("ping_size <= 0xffff", ping_size <= 0xffff);
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p = pbuf_alloc(PBUF_IP, (u16_t)ping_size, PBUF_RAM);
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if (!p) {
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return 0;
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}
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if ((p->len == p->tot_len) && (p->next == NULL)) {
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iecho = (struct icmp_echo_hdr *)p->payload;
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ping_prepare_echo(iecho, (u16_t)ping_size);
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raw_sendto(raw, p, addr);
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#ifdef LWIP_DEBUG
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ping_time = sys_now();
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#endif /* LWIP_DEBUG */
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}
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pbuf_free(p);
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return 1;
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}
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static void
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ping_timeout(void *arg) {
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struct raw_pcb *pcb = (struct raw_pcb *)arg;
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LWIP_ASSERT("ping_timeout: no pcb given!", pcb != NULL);
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ping_send(pcb, ping_target);
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sys_timeout(PING_DELAY, ping_timeout, pcb);
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}
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static void
|
||
|
|
ping_raw_init(void) {
|
||
|
|
if (ping_pcb) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
ping_pcb = raw_new(IP_PROTO_ICMP);
|
||
|
|
LWIP_ASSERT("ping_pcb != NULL", ping_pcb != NULL);
|
||
|
|
|
||
|
|
raw_recv(ping_pcb, ping_recv, NULL);
|
||
|
|
raw_bind(ping_pcb, IP_ADDR_ANY);
|
||
|
|
sys_timeout(PING_DELAY, ping_timeout, ping_pcb);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* PING_USE_SOCKETS */
|
||
|
|
|
||
|
|
void
|
||
|
|
ping_init(const ip_addr_t *ping_addr) {
|
||
|
|
ping_target = ping_addr;
|
||
|
|
|
||
|
|
#if PING_USE_SOCKETS
|
||
|
|
sys_thread_new("ping_thread", ping_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
|
||
|
|
#else /* PING_USE_SOCKETS */
|
||
|
|
ping_raw_init();
|
||
|
|
#endif /* PING_USE_SOCKETS */
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* LWIP_RAW */
|