--- /dev/null
+/**
+ * @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"
+
+#include "apps/ping.h"
+
+#include <geekos/timer.h>
+#include <geekos/ktypes.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 ip_hdr *iphdr;
+ 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 ip_hdr)+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)));
+
+ iphdr = (struct ip_hdr *)buf;
+ iecho = (struct icmp_echo_hdr *)(buf+(IPH_HL(iphdr) * 4));
+ 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 */
+}
+
+
+u32_t
+sys_now()
+{
+ ulong_t msec;
+
+ msec = clock_time();
+
+ return msec;
+}
+
+#endif /* LWIP_RAW && LWIP_ICMP */
