lwip-contrib-mac/apps/ping/ping.c

304 lines
7.6 KiB
C

/**
* @file
* Ping sender module
*
*/
/*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
*/
/**
* This is an example of a "ping" sender (with raw API and socket API).
* It can be used as a start point to maintain opened a network connection, or
* like a network "watchdog" for your device.
*
*/
#include "lwip/opt.h"
#if LWIP_RAW && LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
#include "lwip/mem.h"
#include "lwip/raw.h"
#include "lwip/icmp.h"
#include "lwip/netif.h"
#include "lwip/sys.h"
#include "lwip/sockets.h"
#include "lwip/inet.h"
#include "lwip/inet_chksum.h"
/**
* PING_DEBUG: Enable debugging for PING.
*/
#ifndef PING_DEBUG
#define PING_DEBUG LWIP_DBG_ON
#endif
/** ping target - should be a "struct ip_addr" */
#ifndef PING_TARGET
#define PING_TARGET (netif_default?netif_default->gw:ip_addr_any)
#endif
/** ping receive timeout - in milliseconds */
#ifndef PING_RCV_TIMEO
#define PING_RCV_TIMEO 1000
#endif
/** ping delay - in milliseconds */
#ifndef PING_DELAY
#define PING_DELAY 1000
#endif
/** ping identifier - must fit on a u16_t */
#ifndef PING_ID
#define PING_ID 0xAFAF
#endif
/** ping additional data size to include in the packet */
#ifndef PING_DATA_SIZE
#define PING_DATA_SIZE 32
#endif
/** ping result action - no default action */
#ifndef PING_RESULT
#define PING_RESULT(ping_ok)
#endif
/* ping variables */
static u16_t ping_seq_num;
static u32_t ping_time;
#if NO_SYS
/* port-defined functions used for timer execution */
void sys_msleep(u32_t ms);
u32_t sys_now();
#endif /* NO_SYS */
/** Prepare a echo ICMP request */
static void
ping_prepare_echo( struct icmp_echo_hdr *iecho, u16_t len)
{
int i;
ICMPH_TYPE_SET(iecho,ICMP_ECHO);
ICMPH_CODE_SET(iecho, 0);
iecho->chksum = 0;
iecho->id = PING_ID;
iecho->seqno = htons(++ping_seq_num);
iecho->chksum = inet_chksum(iecho, len);
/* fill the additional data buffer with some data */
for(i = 0; i < PING_DATA_SIZE; i++) {
((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = i;
}
}
#if LWIP_SOCKET
/* Ping using the socket ip */
static err_t
ping_send(int s, struct ip_addr *addr)
{
int err;
struct icmp_echo_hdr *iecho;
struct sockaddr_in to;
size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
if (!(iecho = mem_malloc(ping_size))) {
return ERR_MEM;
}
ping_prepare_echo(iecho, ping_size);
to.sin_len = sizeof(to);
to.sin_family = AF_INET;
to.sin_addr.s_addr = addr->addr;
err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to));
mem_free(iecho);
return (err ? ERR_OK : ERR_VAL);
}
static void
ping_recv(int s)
{
char buf[64];
int fromlen, len;
struct sockaddr_in from;
struct icmp_echo_hdr *iecho;
while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0) {
if (len >= sizeof(struct icmp_echo_hdr)) {
LWIP_DEBUGF( PING_DEBUG, ("ping: recv "));
ip_addr_debug_print(PING_DEBUG, (struct ip_addr *)&(from.sin_addr));
LWIP_DEBUGF( PING_DEBUG, (" %lu ms\n", (sys_now()-ping_time)));
iecho = (struct icmp_echo_hdr *)buf;
if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num))) {
/* do some ping result processing */
PING_RESULT((ICMPH_TYPE(iecho) == ICMP_ER));
return;
} else {
LWIP_DEBUGF( PING_DEBUG, ("ping: drop\n"));
}
}
}
if (len == 0) {
LWIP_DEBUGF( PING_DEBUG, ("ping: recv - %lu ms - timeout\n", (sys_now()-ping_time)));
}
/* do some ping result processing */
PING_RESULT(0);
}
static void
ping_thread(void *arg)
{
int s;
int timeout = PING_RCV_TIMEO;
struct ip_addr ping_target;
LWIP_UNUSED_ARG(arg);
if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0) {
return;
}
lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
while (1) {
ping_target = PING_TARGET;
if (ping_send(s, &ping_target) == ERR_OK) {
LWIP_DEBUGF( PING_DEBUG, ("ping: send "));
ip_addr_debug_print(PING_DEBUG, &ping_target);
LWIP_DEBUGF( PING_DEBUG, ("\n"));
ping_time = sys_now();
ping_recv(s);
} else {
LWIP_DEBUGF( PING_DEBUG, ("ping: send "));
ip_addr_debug_print(PING_DEBUG, &ping_target);
LWIP_DEBUGF( PING_DEBUG, (" - error\n"));
}
sys_msleep(PING_DELAY);
}
}
#else /* LWIP_SOCKET */
/* Ping using the raw ip */
static u8_t
ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *addr)
{
struct icmp_echo_hdr *iecho;
if (pbuf_header( p, -PBUF_IP_HLEN)==0) {
iecho = p->payload;
if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num))) {
LWIP_DEBUGF( PING_DEBUG, ("ping: recv "));
ip_addr_debug_print(PING_DEBUG, addr);
LWIP_DEBUGF( PING_DEBUG, (" %lu ms\n", (sys_now()-ping_time)));
/* do some ping result processing */
PING_RESULT(1);
}
}
return 1; /* eat the event */
}
static void
ping_send(struct raw_pcb *raw, struct ip_addr *addr)
{
struct pbuf *p;
struct icmp_echo_hdr *iecho;
size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
if (!(p = pbuf_alloc(PBUF_IP, ping_size, PBUF_RAM))) {
return;
}
if ((p->len == p->tot_len) && (p->next == NULL)) {
iecho = p->payload;
ping_prepare_echo(iecho, ping_size);
raw_sendto(raw, p, addr);
ping_time = sys_now();
}
pbuf_free(p);
}
static void
ping_timeout(void *arg)
{
struct raw_pcb *pcb = (struct raw_pcb*)arg;
struct ip_addr ping_target = PING_TARGET;
LWIP_ASSERT("ping_timeout: no pcb given!", pcb != NULL);
LWIP_DEBUGF( PING_DEBUG, ("ping: send "));
ip_addr_debug_print(PING_DEBUG, &ping_target);
LWIP_DEBUGF( PING_DEBUG, ("\n"));
ping_send(pcb, &ping_target);
sys_timeout(PING_DELAY, ping_timeout, pcb);
}
static void
ping_raw_init(void)
{
struct raw_pcb *pcb;
if (!(pcb = raw_new(IP_PROTO_ICMP))) {
return;
}
raw_recv(pcb, ping_recv, NULL);
raw_bind(pcb, IP_ADDR_ANY);
sys_timeout(PING_DELAY, ping_timeout, pcb);
}
#endif /* LWIP_SOCKET */
void
ping_init(void)
{
#if LWIP_SOCKET
sys_thread_new("ping_thread", ping_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
#else /* LWIP_SOCKET */
ping_raw_init();
#endif /* LWIP_SOCKET */
}
#endif /* LWIP_RAW && LWIP_ICMP */