300 lines
7.2 KiB
C
300 lines
7.2 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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*/
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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 && LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
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#include "lwip.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/sockets.h"
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#include "lwip/inet.h"
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#include "lwip/inet_chksum.h"
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#include "ping.h"
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static struct ip_addr ping_target;
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static int count=0;
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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 2000
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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 2000
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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 0x0400
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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 u16_t ping_seq_num;
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static u32_t ping_time;
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#if NO_SYS
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/* port-defined functions used for timer execution */
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void sys_msleep(u32_t ms);
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u32_t sys_now();
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#endif /* NO_SYS */
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/** Prepare a echo ICMP request */
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static void
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ping_prepare_echo( struct icmp_echo_hdr *iecho, size_t len)
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{
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int i;
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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 = htons(++ping_seq_num);
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iecho->chksum = 0;
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/* fill the additional data buffer with some data */
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for(i = 0; i < PING_DATA_SIZE; i++) {
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((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = 'a' + i % 26;
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}
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iecho->chksum = inet_chksum(iecho, (uint16_t) len);
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}
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#if LWIP_SOCKET
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/* Ping using the socket ip */
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static err_t
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ping_send(int s, struct ip_addr *addr)
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{
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int err;
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struct icmp_echo_hdr *iecho;
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struct sockaddr_in to;
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size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
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if (!(iecho = mem_malloc(ping_size))) {
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return ERR_MEM;
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}
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ping_prepare_echo(iecho, ping_size);
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to.sin_len = sizeof(to);
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to.sin_family = AF_INET;
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to.sin_addr.s_addr = addr->addr;
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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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{
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char buf[64];
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int len;
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struct sockaddr_in from;
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struct ip_hdr *iphdr;
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struct icmp_echo_hdr *iecho;
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int fromlen = sizeof(struct sockaddr_in);
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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 >= (sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr))) {
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printf(" ping: recv ");
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ip_addr_print((struct ip_addr *)&(from.sin_addr));
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printf(" %u ms\n", sys_now()-ping_time);
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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 == 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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printf("ping: drop\n");
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}
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}
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}
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if (len == 0) {
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printf("ping: recv - %u 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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{
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int s;
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int timeout = PING_RCV_TIMEO;
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LWIP_UNUSED_ARG(arg);
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if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0) {
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return;
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}
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lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
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while (1)
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{
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printf("%4u ping: send ",count++);
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if (ping_send(s, &ping_target) == ERR_OK) {
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ip_addr_print(&ping_target);
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printf("\n");
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ping_time = sys_now();
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ping_recv(s);
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} else {
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ip_addr_print(&ping_target);
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printf(" - 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 /* LWIP_SOCKET */
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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, struct ip_addr *addr)
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{
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struct icmp_echo_hdr *iecho;
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if (pbuf_header( p, -PBUF_IP_HLEN)==0) {
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iecho = p->payload;
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if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num))) {
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printf(" ping: recv "));
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// ip_addr_print(addr);
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printf(" %u 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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}
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}
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return 1; /* eat the event */
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}
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static void
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ping_send(struct raw_pcb *raw, struct ip_addr *addr)
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{
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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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if (!(p = pbuf_alloc(PBUF_IP, ping_size, PBUF_RAM))) {
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return;
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}
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if ((p->len == p->tot_len) && (p->next == NULL)) {
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iecho = p->payload;
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ping_prepare_echo(iecho, ping_size);
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raw_sendto(raw, p, addr);
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ping_time = sys_now();
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}
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pbuf_free(p);
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}
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static void
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ping_timeout(void *arg)
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{
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struct raw_pcb *pcb = (struct raw_pcb*)arg;
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// struct ip_addr ping_target = PING_TARGET;
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LWIP_ASSERT("ping_timeout: no pcb given!", pcb != NULL);
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printf("%4u ping: send ",count++);
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ip_addr_print(&ping_target);
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printf("\n");
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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
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ping_raw_init(void)
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{
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struct raw_pcb *pcb;
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if (!(pcb = raw_new(IP_PROTO_ICMP))) {
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return;
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}
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raw_recv(pcb, ping_recv, NULL);
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raw_bind(pcb, IP_ADDR_ANY);
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sys_timeout(PING_DELAY, ping_timeout, pcb);
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}
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#endif /* LWIP_SOCKET */
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void
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ping_init(struct ip_addr target)
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{
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ping_target = target;
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#if LWIP_SOCKET
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sys_thread_new("ping_thread", ping_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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#else /* LWIP_SOCKET */
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ping_raw_init();
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#endif /* LWIP_SOCKET */
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}
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#endif /* LWIP_RAW && LWIP_ICMP */
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