| 1 |
/** |
| 2 |
* @file |
| 3 |
* Ping sender module |
| 4 |
* |
| 5 |
*/ |
| 6 |
|
| 7 |
/* |
| 8 |
* Redistribution and use in source and binary forms, with or without modification, |
| 9 |
* are permitted provided that the following conditions are met: |
| 10 |
* |
| 11 |
* 1. Redistributions of source code must retain the above copyright notice, |
| 12 |
* this list of conditions and the following disclaimer. |
| 13 |
* 2. Redistributions in binary form must reproduce the above copyright notice, |
| 14 |
* this list of conditions and the following disclaimer in the documentation |
| 15 |
* and/or other materials provided with the distribution. |
| 16 |
* 3. The name of the author may not be used to endorse or promote products |
| 17 |
* derived from this software without specific prior written permission. |
| 18 |
* |
| 19 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 20 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 21 |
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| 22 |
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 23 |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| 24 |
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 |
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 |
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 27 |
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| 28 |
* OF SUCH DAMAGE. |
| 29 |
* |
| 30 |
* This file is part of the lwIP TCP/IP stack. |
| 31 |
* |
| 32 |
*/ |
| 33 |
|
| 34 |
/** |
| 35 |
* This is an example of a "ping" sender (with raw API and socket API). |
| 36 |
* It can be used as a start point to maintain opened a network connection, or |
| 37 |
* like a network "watchdog" for your device. |
| 38 |
* |
| 39 |
*/ |
| 40 |
|
| 41 |
#include "lwip/opt.h" |
| 42 |
|
| 43 |
#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */ |
| 44 |
|
| 45 |
#include "ping.h" |
| 46 |
|
| 47 |
#include "lwip/mem.h" |
| 48 |
#include "lwip/raw.h" |
| 49 |
#include "lwip/icmp.h" |
| 50 |
#include "lwip/netif.h" |
| 51 |
#include "lwip/sys.h" |
| 52 |
#include "lwip/timers.h" |
| 53 |
#include "lwip/inet_chksum.h" |
| 54 |
|
| 55 |
#if PING_USE_SOCKETS |
| 56 |
#include "lwip/sockets.h" |
| 57 |
#include "lwip/inet.h" |
| 58 |
#endif /* PING_USE_SOCKETS */ |
| 59 |
|
| 60 |
|
| 61 |
/** |
| 62 |
* PING_DEBUG: Enable debugging for PING. |
| 63 |
*/ |
| 64 |
#ifndef PING_DEBUG |
| 65 |
#define PING_DEBUG LWIP_DBG_ON |
| 66 |
#endif |
| 67 |
|
| 68 |
/** ping target - should be a "ip_addr_t" */ |
| 69 |
#ifndef PING_TARGET |
| 70 |
#define PING_TARGET (netif_default?netif_default->gw:ip_addr_any) |
| 71 |
#endif |
| 72 |
|
| 73 |
/** ping receive timeout - in milliseconds */ |
| 74 |
#ifndef PING_RCV_TIMEO |
| 75 |
#define PING_RCV_TIMEO 1000 |
| 76 |
#endif |
| 77 |
|
| 78 |
/** ping delay - in milliseconds */ |
| 79 |
#ifndef PING_DELAY |
| 80 |
#define PING_DELAY 1000 |
| 81 |
#endif |
| 82 |
|
| 83 |
/** ping identifier - must fit on a u16_t */ |
| 84 |
#ifndef PING_ID |
| 85 |
#define PING_ID 0xAFAF |
| 86 |
#endif |
| 87 |
|
| 88 |
/** ping additional data size to include in the packet */ |
| 89 |
#ifndef PING_DATA_SIZE |
| 90 |
#define PING_DATA_SIZE 32 |
| 91 |
#endif |
| 92 |
|
| 93 |
/** ping result action - no default action */ |
| 94 |
#ifndef PING_RESULT |
| 95 |
#define PING_RESULT(ping_ok) |
| 96 |
#endif |
| 97 |
|
| 98 |
/* ping variables */ |
| 99 |
static u16_t ping_seq_num; |
| 100 |
static u32_t ping_time; |
| 101 |
#if !PING_USE_SOCKETS |
| 102 |
static struct raw_pcb *ping_pcb; |
| 103 |
#endif /* PING_USE_SOCKETS */ |
| 104 |
|
| 105 |
/** Prepare a echo ICMP request */ |
| 106 |
static void |
| 107 |
ping_prepare_echo( struct icmp_echo_hdr *iecho, u16_t len) |
| 108 |
{ |
| 109 |
size_t i; |
| 110 |
size_t data_len = len - sizeof(struct icmp_echo_hdr); |
| 111 |
|
| 112 |
ICMPH_TYPE_SET(iecho, ICMP_ECHO); |
| 113 |
ICMPH_CODE_SET(iecho, 0); |
| 114 |
iecho->chksum = 0; |
| 115 |
iecho->id = PING_ID; |
| 116 |
iecho->seqno = htons(++ping_seq_num); |
| 117 |
|
| 118 |
/* fill the additional data buffer with some data */ |
| 119 |
for(i = 0; i < data_len; i++) { |
| 120 |
((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i; |
| 121 |
} |
| 122 |
|
| 123 |
iecho->chksum = inet_chksum(iecho, len); |
| 124 |
} |
| 125 |
|
| 126 |
#if PING_USE_SOCKETS |
| 127 |
|
| 128 |
/* Ping using the socket ip */ |
| 129 |
static err_t |
| 130 |
ping_send(int s, ip_addr_t *addr) |
| 131 |
{ |
| 132 |
int err; |
| 133 |
struct icmp_echo_hdr *iecho; |
| 134 |
struct sockaddr_in to; |
| 135 |
size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE; |
| 136 |
LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff); |
| 137 |
|
| 138 |
iecho = (struct icmp_echo_hdr *)mem_malloc((mem_size_t)ping_size); |
| 139 |
if (!iecho) { |
| 140 |
return ERR_MEM; |
| 141 |
} |
| 142 |
|
| 143 |
ping_prepare_echo(iecho, (u16_t)ping_size); |
| 144 |
|
| 145 |
to.sin_len = sizeof(to); |
| 146 |
to.sin_family = AF_INET; |
| 147 |
inet_addr_from_ipaddr(&to.sin_addr, addr); |
| 148 |
|
| 149 |
err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to)); |
| 150 |
|
| 151 |
mem_free(iecho); |
| 152 |
|
| 153 |
return (err ? ERR_OK : ERR_VAL); |
| 154 |
} |
| 155 |
|
| 156 |
static void |
| 157 |
ping_recv(int s) |
| 158 |
{ |
| 159 |
char buf[64]; |
| 160 |
int fromlen, len; |
| 161 |
struct sockaddr_in from; |
| 162 |
struct ip_hdr *iphdr; |
| 163 |
struct icmp_echo_hdr *iecho; |
| 164 |
|
| 165 |
while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0) { |
| 166 |
if (len >= (int)(sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr))) { |
| 167 |
ip_addr_t fromaddr; |
| 168 |
inet_addr_to_ipaddr(&fromaddr, &from.sin_addr); |
| 169 |
LWIP_DEBUGF( PING_DEBUG, ("ping: recv ")); |
| 170 |
ip_addr_debug_print(PING_DEBUG, &fromaddr); |
| 171 |
LWIP_DEBUGF( PING_DEBUG, (" %"U32_F" ms\n", (sys_now() - ping_time))); |
| 172 |
|
| 173 |
iphdr = (struct ip_hdr *)buf; |
| 174 |
iecho = (struct icmp_echo_hdr *)(buf + (IPH_HL(iphdr) * 4)); |
| 175 |
if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num))) { |
| 176 |
/* do some ping result processing */ |
| 177 |
PING_RESULT((ICMPH_TYPE(iecho) == ICMP_ER)); |
| 178 |
return; |
| 179 |
} else { |
| 180 |
LWIP_DEBUGF( PING_DEBUG, ("ping: drop\n")); |
| 181 |
} |
| 182 |
} |
| 183 |
} |
| 184 |
|
| 185 |
if (len == 0) { |
| 186 |
LWIP_DEBUGF( PING_DEBUG, ("ping: recv - %"U32_F" ms - timeout\n", (sys_now()-ping_time))); |
| 187 |
} |
| 188 |
|
| 189 |
/* do some ping result processing */ |
| 190 |
PING_RESULT(0); |
| 191 |
} |
| 192 |
|
| 193 |
static void |
| 194 |
ping_thread(void *arg) |
| 195 |
{ |
| 196 |
int s; |
| 197 |
int timeout = PING_RCV_TIMEO; |
| 198 |
ip_addr_t ping_target; |
| 199 |
|
| 200 |
LWIP_UNUSED_ARG(arg); |
| 201 |
|
| 202 |
if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0) { |
| 203 |
return; |
| 204 |
} |
| 205 |
|
| 206 |
lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)); |
| 207 |
|
| 208 |
while (1) { |
| 209 |
ping_target = PING_TARGET; |
| 210 |
|
| 211 |
if (ping_send(s, &ping_target) == ERR_OK) { |
| 212 |
LWIP_DEBUGF( PING_DEBUG, ("ping: send ")); |
| 213 |
ip_addr_debug_print(PING_DEBUG, &ping_target); |
| 214 |
LWIP_DEBUGF( PING_DEBUG, ("\n")); |
| 215 |
|
| 216 |
ping_time = sys_now(); |
| 217 |
ping_recv(s); |
| 218 |
} else { |
| 219 |
LWIP_DEBUGF( PING_DEBUG, ("ping: send ")); |
| 220 |
ip_addr_debug_print(PING_DEBUG, &ping_target); |
| 221 |
LWIP_DEBUGF( PING_DEBUG, (" - error\n")); |
| 222 |
} |
| 223 |
sys_msleep(PING_DELAY); |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
#else /* PING_USE_SOCKETS */ |
| 228 |
|
| 229 |
/* Ping using the raw ip */ |
| 230 |
static u8_t |
| 231 |
ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *addr) |
| 232 |
{ |
| 233 |
struct icmp_echo_hdr *iecho; |
| 234 |
LWIP_UNUSED_ARG(arg); |
| 235 |
LWIP_UNUSED_ARG(pcb); |
| 236 |
LWIP_UNUSED_ARG(addr); |
| 237 |
LWIP_ASSERT("p != NULL", p != NULL); |
| 238 |
|
| 239 |
if (pbuf_header( p, -PBUF_IP_HLEN)==0) { |
| 240 |
iecho = (struct icmp_echo_hdr *)p->payload; |
| 241 |
|
| 242 |
if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num))) { |
| 243 |
LWIP_DEBUGF( PING_DEBUG, ("ping: recv ")); |
| 244 |
ip_addr_debug_print(PING_DEBUG, addr); |
| 245 |
LWIP_DEBUGF( PING_DEBUG, (" %"U32_F" ms\n", (sys_now()-ping_time))); |
| 246 |
|
| 247 |
/* do some ping result processing */ |
| 248 |
PING_RESULT(1); |
| 249 |
pbuf_free(p); |
| 250 |
return 1; /* eat the packet */ |
| 251 |
} |
| 252 |
} |
| 253 |
|
| 254 |
return 0; /* don't eat the packet */ |
| 255 |
} |
| 256 |
|
| 257 |
static void |
| 258 |
ping_send(struct raw_pcb *raw, ip_addr_t *addr) |
| 259 |
{ |
| 260 |
struct pbuf *p; |
| 261 |
struct icmp_echo_hdr *iecho; |
| 262 |
size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE; |
| 263 |
|
| 264 |
LWIP_DEBUGF( PING_DEBUG, ("ping: send ")); |
| 265 |
ip_addr_debug_print(PING_DEBUG, addr); |
| 266 |
LWIP_DEBUGF( PING_DEBUG, ("\n")); |
| 267 |
LWIP_ASSERT("ping_size <= 0xffff", ping_size <= 0xffff); |
| 268 |
|
| 269 |
p = pbuf_alloc(PBUF_IP, (u16_t)ping_size, PBUF_RAM); |
| 270 |
if (!p) { |
| 271 |
return; |
| 272 |
} |
| 273 |
if ((p->len == p->tot_len) && (p->next == NULL)) { |
| 274 |
iecho = (struct icmp_echo_hdr *)p->payload; |
| 275 |
|
| 276 |
ping_prepare_echo(iecho, (u16_t)ping_size); |
| 277 |
|
| 278 |
raw_sendto(raw, p, addr); |
| 279 |
ping_time = sys_now(); |
| 280 |
} |
| 281 |
pbuf_free(p); |
| 282 |
} |
| 283 |
|
| 284 |
static void |
| 285 |
ping_timeout(void *arg) |
| 286 |
{ |
| 287 |
struct raw_pcb *pcb = (struct raw_pcb*)arg; |
| 288 |
ip_addr_t ping_target = PING_TARGET; |
| 289 |
|
| 290 |
LWIP_ASSERT("ping_timeout: no pcb given!", pcb != NULL); |
| 291 |
|
| 292 |
ping_send(pcb, &ping_target); |
| 293 |
|
| 294 |
sys_timeout(PING_DELAY, ping_timeout, pcb); |
| 295 |
} |
| 296 |
|
| 297 |
static void |
| 298 |
ping_raw_init(void) |
| 299 |
{ |
| 300 |
ping_pcb = raw_new(IP_PROTO_ICMP); |
| 301 |
LWIP_ASSERT("ping_pcb != NULL", ping_pcb != NULL); |
| 302 |
|
| 303 |
raw_recv(ping_pcb, ping_recv, NULL); |
| 304 |
raw_bind(ping_pcb, IP_ADDR_ANY); |
| 305 |
sys_timeout(PING_DELAY, ping_timeout, ping_pcb); |
| 306 |
} |
| 307 |
|
| 308 |
void |
| 309 |
ping_send_now() |
| 310 |
{ |
| 311 |
ip_addr_t ping_target = PING_TARGET; |
| 312 |
LWIP_ASSERT("ping_pcb != NULL", ping_pcb != NULL); |
| 313 |
ping_send(ping_pcb, &ping_target); |
| 314 |
} |
| 315 |
|
| 316 |
#endif /* PING_USE_SOCKETS */ |
| 317 |
|
| 318 |
void |
| 319 |
ping_init(void) |
| 320 |
{ |
| 321 |
#if PING_USE_SOCKETS |
| 322 |
sys_thread_new("ping_thread", ping_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO); |
| 323 |
#else /* PING_USE_SOCKETS */ |
| 324 |
ping_raw_init(); |
| 325 |
#endif /* PING_USE_SOCKETS */ |
| 326 |
} |
| 327 |
|
| 328 |
#endif /* LWIP_RAW */ |