| 1 |
#define _POSIX_C_SOURCE 200112 |
| 2 |
#define _XOPEN_SOURCE 600 |
| 3 |
#define _LARGEFILE64_SOURCE 1 |
| 4 |
|
| 5 |
#ifdef __APPLE__ |
| 6 |
# define IPV6 0 |
| 7 |
#else |
| 8 |
# define IPV6 1 // if you get compilation problems try to disable IPv6 |
| 9 |
#endif |
| 10 |
|
| 11 |
#include "EXTERN.h" |
| 12 |
#include "perl.h" |
| 13 |
#include "XSUB.h" |
| 14 |
|
| 15 |
#include <pthread.h> |
| 16 |
|
| 17 |
#include <math.h> |
| 18 |
#include <stdio.h> |
| 19 |
#include <stdlib.h> |
| 20 |
#include <string.h> |
| 21 |
|
| 22 |
#include <time.h> |
| 23 |
#include <poll.h> |
| 24 |
#include <unistd.h> |
| 25 |
#include <inttypes.h> |
| 26 |
#include <fcntl.h> |
| 27 |
#include <errno.h> |
| 28 |
|
| 29 |
#include <sys/types.h> |
| 30 |
#include <sys/time.h> |
| 31 |
#include <sys/socket.h> |
| 32 |
|
| 33 |
#include <netinet/in.h> |
| 34 |
#include <arpa/inet.h> |
| 35 |
|
| 36 |
#ifdef __linux |
| 37 |
# include <linux/icmp.h> |
| 38 |
#endif |
| 39 |
#if IPV6 |
| 40 |
# include <netinet/icmp6.h> |
| 41 |
#endif |
| 42 |
|
| 43 |
#define ICMP4_ECHO 8 |
| 44 |
#define ICMP4_ECHO_REPLY 0 |
| 45 |
#define ICMP6_ECHO 128 |
| 46 |
#define ICMP6_ECHO_REPLY 129 |
| 47 |
|
| 48 |
#define DRAIN_INTERVAL .000001 // how long to wait when sendto returns ENOBUFS, in seconds |
| 49 |
#define MIN_INTERVAL .000001 // minimum packet send interval, in seconds |
| 50 |
|
| 51 |
#define HDR_SIZE_IP4 20 |
| 52 |
#define HDR_SIZE_IP6 48 |
| 53 |
|
| 54 |
//TODO: xread/xwrite for atomicity? we currently rely on the fact that the pip buffersize divides exactly by pointer sizes |
| 55 |
|
| 56 |
typedef uint8_t addr_t[16]; |
| 57 |
|
| 58 |
typedef double tstamp; |
| 59 |
|
| 60 |
tstamp |
| 61 |
NOW () |
| 62 |
{ |
| 63 |
struct timeval tv; |
| 64 |
gettimeofday (&tv, 0); |
| 65 |
return tv.tv_sec + tv.tv_usec * 0.000001; |
| 66 |
} |
| 67 |
|
| 68 |
typedef struct { |
| 69 |
int family; |
| 70 |
addr_t lo, hi; |
| 71 |
double interval; |
| 72 |
tstamp next; |
| 73 |
} RANGE; |
| 74 |
|
| 75 |
typedef struct { |
| 76 |
SV *id; |
| 77 |
double interval; |
| 78 |
int nranges; |
| 79 |
RANGE *ranges; |
| 80 |
uint32_t payload; |
| 81 |
} REQ; |
| 82 |
|
| 83 |
typedef struct { |
| 84 |
uint8_t version_ihl; |
| 85 |
uint8_t tos; |
| 86 |
uint16_t tot_len; |
| 87 |
|
| 88 |
uint16_t id; |
| 89 |
uint16_t flags; |
| 90 |
|
| 91 |
uint8_t ttl; |
| 92 |
uint8_t protocol; |
| 93 |
uint16_t cksum; |
| 94 |
|
| 95 |
uint32_t src; |
| 96 |
uint32_t dst; |
| 97 |
} IP4HDR; |
| 98 |
|
| 99 |
typedef struct { |
| 100 |
uint8_t version; |
| 101 |
uint8_t x1, x2, x3; |
| 102 |
|
| 103 |
uint16_t payload_len; |
| 104 |
uint8_t nxt_hdr; |
| 105 |
uint8_t hop_limit; |
| 106 |
|
| 107 |
uint8_t src[16]; |
| 108 |
uint8_t dst[16]; |
| 109 |
} IP6HDR; |
| 110 |
|
| 111 |
#define MAGIC 0xca4c |
| 112 |
|
| 113 |
static uint16_t magic; |
| 114 |
|
| 115 |
typedef struct { |
| 116 |
uint8_t type, code; |
| 117 |
uint16_t cksum; |
| 118 |
uint16_t id, seq; |
| 119 |
uint32_t payload; |
| 120 |
tstamp stamp; // be careful when accessing this |
| 121 |
} PKT; |
| 122 |
|
| 123 |
static pthread_t pthrid; |
| 124 |
static int thr_send[2]; // send to worker |
| 125 |
static int thr_recv[2]; // receive from worker |
| 126 |
|
| 127 |
static int icmp4_fd, icmp6_fd; |
| 128 |
|
| 129 |
static AV *cbs; |
| 130 |
|
| 131 |
static uint16_t |
| 132 |
icmp_cksum (void *data, unsigned int len) |
| 133 |
{ |
| 134 |
register int sum = 0; |
| 135 |
uint16_t *wp; |
| 136 |
|
| 137 |
assert (~len & 1); |
| 138 |
|
| 139 |
for (wp = (uint16_t *)data; len; wp++, len -= 2) |
| 140 |
sum += *wp; |
| 141 |
|
| 142 |
sum = (sum >> 16) + (sum & 0xffff); /* add high 16 to low 16 */ |
| 143 |
sum += sum >> 16; /* add carry */ |
| 144 |
|
| 145 |
return ~sum; |
| 146 |
} |
| 147 |
|
| 148 |
static void |
| 149 |
inc_addr (addr_t *addr) |
| 150 |
{ |
| 151 |
int len = sizeof (addr_t) - 1; |
| 152 |
|
| 153 |
do |
| 154 |
{ |
| 155 |
if ((*addr)[len] != 0xff) |
| 156 |
{ |
| 157 |
++(*addr)[len]; |
| 158 |
break; |
| 159 |
} |
| 160 |
|
| 161 |
(*addr)[len] = 0; |
| 162 |
} |
| 163 |
while (len--); |
| 164 |
} |
| 165 |
|
| 166 |
static void * |
| 167 |
ping_proc (void *unused) |
| 168 |
{ |
| 169 |
PKT pkt; |
| 170 |
struct sockaddr_in sa4; |
| 171 |
#if IPV6 |
| 172 |
struct sockaddr_in6 sa6; |
| 173 |
#endif |
| 174 |
|
| 175 |
memset (&pkt, 0, sizeof (pkt)); |
| 176 |
|
| 177 |
memset (&sa4, 0, sizeof (sa4)); |
| 178 |
sa4.sin_family = AF_INET; |
| 179 |
sa4.sin_port = 0; |
| 180 |
#if IPV6 |
| 181 |
memset (&sa6, 0, sizeof (sa6)); |
| 182 |
sa6.sin6_family = AF_INET6; |
| 183 |
sa6.sin6_port = 0; |
| 184 |
#endif |
| 185 |
|
| 186 |
for (;;) |
| 187 |
{ |
| 188 |
REQ *req; |
| 189 |
int len = read (thr_send [0], &req, sizeof (req)); |
| 190 |
|
| 191 |
if (!len) |
| 192 |
pthread_exit (0); |
| 193 |
else if (len != sizeof (req)) |
| 194 |
{ |
| 195 |
perror ("AnyEvent::FastPing: short reead or read error"); |
| 196 |
pthread_exit ((void *)-1); |
| 197 |
} |
| 198 |
|
| 199 |
//TODO: bind to source address |
| 200 |
|
| 201 |
pkt.code = 0; |
| 202 |
pkt.id = (uint16_t)magic; |
| 203 |
pkt.seq = (uint16_t)~magic; |
| 204 |
pkt.payload = req->payload; |
| 205 |
|
| 206 |
tstamp now = NOW (); |
| 207 |
tstamp next = now; |
| 208 |
|
| 209 |
{ |
| 210 |
int r; |
| 211 |
for (r = req->nranges; r--; ) |
| 212 |
inc_addr (&req->ranges [r].hi); |
| 213 |
} |
| 214 |
|
| 215 |
while (req->nranges) |
| 216 |
{ |
| 217 |
RANGE *range = req->ranges; |
| 218 |
|
| 219 |
if (!memcmp (&range->lo, &range->hi, sizeof (addr_t))) |
| 220 |
req->ranges [0] = req->ranges [--req->nranges]; |
| 221 |
else |
| 222 |
{ |
| 223 |
// ranges [0] is always the next range to ping |
| 224 |
tstamp wait = range->next - now; |
| 225 |
|
| 226 |
// compare with the global frequency limit |
| 227 |
{ |
| 228 |
tstamp diff = next - now; |
| 229 |
|
| 230 |
if (wait < diff) |
| 231 |
wait = diff; |
| 232 |
else if (range) |
| 233 |
next = range->next; |
| 234 |
} |
| 235 |
|
| 236 |
if (wait > 0.) |
| 237 |
{ |
| 238 |
struct timespec ts; |
| 239 |
|
| 240 |
ts.tv_sec = wait; |
| 241 |
ts.tv_nsec = (wait - ts.tv_sec) * 1000000000.; |
| 242 |
|
| 243 |
nanosleep (&ts, 0); |
| 244 |
} |
| 245 |
|
| 246 |
now = NOW (); |
| 247 |
|
| 248 |
pkt.stamp = now; |
| 249 |
pkt.cksum = 0; |
| 250 |
|
| 251 |
if (range->family == AF_INET) |
| 252 |
{ |
| 253 |
pkt.type = ICMP4_ECHO; |
| 254 |
pkt.cksum = icmp_cksum (&pkt, sizeof (pkt)); |
| 255 |
|
| 256 |
memcpy (&sa4.sin_addr, |
| 257 |
sizeof (addr_t) - sizeof (sa4.sin_addr) + (char *)&range->lo, |
| 258 |
sizeof (sa4.sin_addr)); |
| 259 |
|
| 260 |
if (sendto (icmp4_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa4, sizeof (sa4)) > 0) |
| 261 |
errno = 0; |
| 262 |
} |
| 263 |
else |
| 264 |
{ |
| 265 |
#if IPV6 |
| 266 |
pkt.type = ICMP6_ECHO; |
| 267 |
|
| 268 |
memcpy (&sa6.sin6_addr, |
| 269 |
sizeof (addr_t) - sizeof (sa6.sin6_addr) + (char *)&range->lo, |
| 270 |
sizeof (sa6.sin6_addr)); |
| 271 |
|
| 272 |
if (sendto (icmp6_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa6, sizeof (sa6)) > 0) |
| 273 |
errno = 0; |
| 274 |
#endif |
| 275 |
} |
| 276 |
|
| 277 |
if (errno == ENOBUFS) |
| 278 |
{ |
| 279 |
struct timespec ts; |
| 280 |
|
| 281 |
ts.tv_sec = 0; |
| 282 |
ts.tv_nsec = DRAIN_INTERVAL * 1000000000; |
| 283 |
|
| 284 |
nanosleep (&ts, 0); |
| 285 |
} |
| 286 |
else |
| 287 |
{ |
| 288 |
inc_addr (&range->lo); |
| 289 |
|
| 290 |
range->next = next; |
| 291 |
range->next += range->interval; |
| 292 |
} |
| 293 |
|
| 294 |
next += req->interval; |
| 295 |
} |
| 296 |
|
| 297 |
// make a downheap operation |
| 298 |
int k = 0; |
| 299 |
int n = 0; |
| 300 |
for (;;) |
| 301 |
{ |
| 302 |
++n; |
| 303 |
int j = k * 2 + 1; |
| 304 |
|
| 305 |
if (j >= req->nranges) |
| 306 |
break; |
| 307 |
else if (j < req->nranges - 1) |
| 308 |
if (req->ranges [j].next > req->ranges [j + 1].next) |
| 309 |
++j; |
| 310 |
|
| 311 |
if (req->ranges [j].next >= req->ranges [k].next) |
| 312 |
break; |
| 313 |
|
| 314 |
RANGE temp = req->ranges [k]; |
| 315 |
req->ranges [k] = req->ranges [j]; |
| 316 |
req->ranges [j] = temp; |
| 317 |
|
| 318 |
k = j; |
| 319 |
} |
| 320 |
} |
| 321 |
|
| 322 |
write (thr_recv [1], &req, sizeof (req)); |
| 323 |
} |
| 324 |
|
| 325 |
return 0; |
| 326 |
} |
| 327 |
|
| 328 |
static void |
| 329 |
feed_reply (AV *res_av) |
| 330 |
{ |
| 331 |
if (av_len (res_av) < 0) |
| 332 |
return; |
| 333 |
|
| 334 |
dSP; |
| 335 |
SV *res = sv_2mortal (newRV_inc ((SV *)res_av)); |
| 336 |
int i; |
| 337 |
|
| 338 |
ENTER; |
| 339 |
SAVETMPS; |
| 340 |
|
| 341 |
for (i = av_len (cbs) + 1; i--; ) |
| 342 |
{ |
| 343 |
SV *cb = *av_fetch (cbs, i, 1); |
| 344 |
|
| 345 |
PUSHMARK (SP); |
| 346 |
XPUSHs (res); |
| 347 |
PUTBACK; |
| 348 |
call_sv (cb, G_DISCARD | G_VOID); |
| 349 |
} |
| 350 |
|
| 351 |
FREETMPS; |
| 352 |
LEAVE; |
| 353 |
} |
| 354 |
|
| 355 |
static void |
| 356 |
boot () |
| 357 |
{ |
| 358 |
sigset_t fullsigset, oldsigset; |
| 359 |
pthread_attr_t attr; |
| 360 |
|
| 361 |
if (pipe (thr_send) < 0) |
| 362 |
croak ("AnyEvent::FastPing: unable to create send pipe"); |
| 363 |
|
| 364 |
if (pipe (thr_recv) < 0) |
| 365 |
croak ("AnyEvent::FastPing: unable to create receive pipe"); |
| 366 |
|
| 367 |
icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| 368 |
fcntl (icmp4_fd, F_SETFL, O_NONBLOCK); |
| 369 |
#ifdef ICMP_FILTER |
| 370 |
{ |
| 371 |
struct icmp_filter oval; |
| 372 |
oval.data = 0xffffffff & ~(1 << ICMP4_ECHO_REPLY); |
| 373 |
setsockopt (icmp4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
| 374 |
} |
| 375 |
#endif |
| 376 |
|
| 377 |
#if IPV6 |
| 378 |
icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); |
| 379 |
fcntl (icmp6_fd, F_SETFL, O_NONBLOCK); |
| 380 |
# ifdef ICMP6_FILTER |
| 381 |
{ |
| 382 |
struct icmp6_filter oval; |
| 383 |
ICMP6_FILTER_SETBLOCKALL (&oval); |
| 384 |
ICMP6_FILTER_SETPASS (ICMP6_ECHO_REPLY, &oval); |
| 385 |
setsockopt (icmp6_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &oval, sizeof oval); |
| 386 |
} |
| 387 |
# endif |
| 388 |
#endif |
| 389 |
|
| 390 |
pthread_attr_init (&attr); |
| 391 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
| 392 |
#ifdef PTHREAD_SCOPE_PROCESS |
| 393 |
pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
| 394 |
#endif |
| 395 |
|
| 396 |
sigfillset (&fullsigset); |
| 397 |
|
| 398 |
pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset); |
| 399 |
|
| 400 |
if (pthread_create (&pthrid, &attr, ping_proc, 0)) |
| 401 |
croak ("AnyEvent::FastPing: unable to create pinger thread"); |
| 402 |
|
| 403 |
pthread_sigmask (SIG_SETMASK, &oldsigset, 0); |
| 404 |
|
| 405 |
sv_setiv (get_sv ("AnyEvent::FastPing::THR_REQ_FD", 1), thr_send [1]); |
| 406 |
sv_setiv (get_sv ("AnyEvent::FastPing::THR_RES_FD", 1), thr_recv [0]); |
| 407 |
|
| 408 |
sv_setiv (get_sv ("AnyEvent::FastPing::ICMP4_FD", 1), icmp4_fd); |
| 409 |
sv_setiv (get_sv ("AnyEvent::FastPing::ICMP6_FD", 1), icmp6_fd); |
| 410 |
} |
| 411 |
|
| 412 |
MODULE = AnyEvent::FastPing PACKAGE = AnyEvent::FastPing |
| 413 |
|
| 414 |
BOOT: |
| 415 |
{ |
| 416 |
HV *stash = gv_stashpv ("AnyEvent::FastPing", 1); |
| 417 |
|
| 418 |
cbs = get_av ("AnyEvent::FastPing::CB", 1); |
| 419 |
magic = getpid () ^ MAGIC; |
| 420 |
|
| 421 |
boot (); |
| 422 |
|
| 423 |
newCONSTSUB (stash, "ipv4_supported", newSViv (icmp4_fd >= 0)); |
| 424 |
newCONSTSUB (stash, "ipv6_supported", newSViv (icmp6_fd >= 0)); |
| 425 |
|
| 426 |
newCONSTSUB (stash, "icmp4_pktsize", newSViv (HDR_SIZE_IP4 + sizeof (PKT))); |
| 427 |
newCONSTSUB (stash, "icmp6_pktsize", newSViv (HDR_SIZE_IP6 + sizeof (PKT))); |
| 428 |
} |
| 429 |
|
| 430 |
PROTOTYPES: DISABLE |
| 431 |
|
| 432 |
SV * |
| 433 |
_req_icmp_ping (SV *ranges, NV interval, U32 payload, SV *id) |
| 434 |
CODE: |
| 435 |
{ |
| 436 |
if (!SvROK (ranges) || SvTYPE (SvRV (ranges)) != SVt_PVAV) |
| 437 |
croak ("address ranges must be given as arrayref with lo, hi pairs"); |
| 438 |
|
| 439 |
AV *rav = (AV *)SvRV (ranges); |
| 440 |
int nranges = av_len (rav) + 1; |
| 441 |
|
| 442 |
REQ *req = malloc (sizeof (REQ)); |
| 443 |
int i; |
| 444 |
|
| 445 |
if (interval < MIN_INTERVAL) |
| 446 |
interval = MIN_INTERVAL; |
| 447 |
|
| 448 |
req->id = newSVsv (id); |
| 449 |
req->interval = interval; |
| 450 |
req->payload = payload; |
| 451 |
req->nranges = nranges; |
| 452 |
req->ranges = (RANGE *)malloc (nranges * sizeof (RANGE)); |
| 453 |
|
| 454 |
while (nranges--) |
| 455 |
{ |
| 456 |
SV *sv = *av_fetch (rav, nranges, 1); |
| 457 |
|
| 458 |
if (!SvROK (sv) || SvTYPE (SvRV (sv)) != SVt_PVAV) |
| 459 |
croak ("address range must be given as arrayref with lo, hi, interval arrayrefs"); |
| 460 |
|
| 461 |
AV *av = (AV *)SvRV (sv); |
| 462 |
RANGE *r = req->ranges + nranges; |
| 463 |
|
| 464 |
SV *lo = *av_fetch (av, 0, 1); |
| 465 |
SV *hi = *av_fetch (av, 1, 1); |
| 466 |
|
| 467 |
sv_utf8_downgrade (lo, 0); |
| 468 |
sv_utf8_downgrade (hi, 0); |
| 469 |
|
| 470 |
memset (&r->lo, 0, sizeof (addr_t)); |
| 471 |
memset (&r->hi, 0, sizeof (addr_t)); |
| 472 |
|
| 473 |
if (SvPOKp (lo) && SvPOKp (hi)) |
| 474 |
{ |
| 475 |
if (SvCUR (lo) != SvCUR (hi)) |
| 476 |
croak ("addresses in range must be of the same size (either 4 or 16 bytes)"); |
| 477 |
|
| 478 |
if (SvCUR (lo) == 4) |
| 479 |
{ |
| 480 |
r->family = AF_INET; |
| 481 |
memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, SvPVX (lo), 4); |
| 482 |
memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, SvPVX (hi), 4); |
| 483 |
} |
| 484 |
else if (SvCUR (lo) == 16) |
| 485 |
{ |
| 486 |
#if IPV6 |
| 487 |
r->family = AF_INET6; |
| 488 |
memcpy (&r->lo, SvPVX (lo), sizeof (addr_t)); |
| 489 |
memcpy (&r->hi, SvPVX (hi), sizeof (addr_t)); |
| 490 |
#else |
| 491 |
croak ("IPv6 not supported in this configuration"); |
| 492 |
#endif |
| 493 |
} |
| 494 |
else |
| 495 |
croak ("addresses in range must be either 4 (IPv4) or 16 (IPV6) bytes in length"); |
| 496 |
} |
| 497 |
else if (SvIOK (lo) && SvIOK (hi)) |
| 498 |
{ |
| 499 |
r->family = AF_INET; |
| 500 |
|
| 501 |
uint32_t addr; |
| 502 |
addr = htonl (SvUV (lo)); memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, &addr, 4); |
| 503 |
addr = htonl (SvUV (hi)); memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, &addr, 4); |
| 504 |
} |
| 505 |
else |
| 506 |
croak ("addresses in range must be strings with either 4 (IPv4) or 16 (IPv6) octets"); |
| 507 |
|
| 508 |
if (r->family == AF_INET) |
| 509 |
{ |
| 510 |
if (icmp4_fd < 0) |
| 511 |
croak ("AnyEvent::FastPing: IPv4 ping support not available on this system"); |
| 512 |
} |
| 513 |
else |
| 514 |
{ |
| 515 |
if (icmp6_fd < 0) |
| 516 |
croak ("AnyEvent::FastPing: IPv6 ping support not available on this system"); |
| 517 |
} |
| 518 |
|
| 519 |
r->interval = SvNV (*av_fetch (av, 2, 1)); |
| 520 |
|
| 521 |
if (r->interval < req->interval) |
| 522 |
r->interval = req->interval; |
| 523 |
|
| 524 |
r->next = 0.; |
| 525 |
} |
| 526 |
|
| 527 |
RETVAL = newSVpvn ((char *)&req, sizeof (req)); |
| 528 |
} |
| 529 |
OUTPUT: |
| 530 |
RETVAL |
| 531 |
|
| 532 |
SV * |
| 533 |
_read_res () |
| 534 |
CODE: |
| 535 |
{ |
| 536 |
REQ *req; |
| 537 |
|
| 538 |
if (read (thr_recv [0], &req, sizeof (req)) != sizeof (req)) |
| 539 |
RETVAL = &PL_sv_undef; |
| 540 |
|
| 541 |
RETVAL = req->id; |
| 542 |
free (req->ranges); |
| 543 |
free (req); |
| 544 |
} |
| 545 |
OUTPUT: |
| 546 |
RETVAL |
| 547 |
|
| 548 |
void |
| 549 |
_recv_icmp4 (...) |
| 550 |
CODE: |
| 551 |
{ |
| 552 |
char buf [512]; |
| 553 |
struct sockaddr_in sa; |
| 554 |
socklen_t sl = sizeof (sa); |
| 555 |
AV *res_av = av_len (cbs) < 0 ? 0 : (AV *)sv_2mortal ((SV *)newAV ()); |
| 556 |
tstamp now = NOW (); |
| 557 |
|
| 558 |
for (;;) |
| 559 |
{ |
| 560 |
int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_TRUNC, (struct sockaddr *)&sa, &sl); |
| 561 |
|
| 562 |
if (len <= HDR_SIZE_IP4) |
| 563 |
break; |
| 564 |
|
| 565 |
IP4HDR *iphdr = (IP4HDR *)buf; |
| 566 |
|
| 567 |
int hdrlen = (iphdr->version_ihl & 15) * 4; |
| 568 |
int totlen = ntohs (iphdr->tot_len); |
| 569 |
|
| 570 |
// packet corrupt? |
| 571 |
if (!res_av |
| 572 |
|| totlen > len |
| 573 |
|| iphdr->protocol != IPPROTO_ICMP |
| 574 |
|| hdrlen < HDR_SIZE_IP4 || hdrlen + sizeof (PKT) != totlen) |
| 575 |
continue; |
| 576 |
|
| 577 |
PKT *pkt = (PKT *)(buf + hdrlen); |
| 578 |
|
| 579 |
if (pkt->type != ICMP4_ECHO_REPLY |
| 580 |
|| pkt->id != (uint16_t) magic |
| 581 |
|| pkt->seq != (uint16_t)~magic |
| 582 |
|| !isnormal (pkt->stamp)) |
| 583 |
continue; |
| 584 |
|
| 585 |
AV *av = newAV (); |
| 586 |
av_push (av, newSVpvn ((char *)&sa.sin_addr, 4)); |
| 587 |
av_push (av, newSVnv (now - pkt->stamp)); |
| 588 |
av_push (av, newSVuv (pkt->payload)); |
| 589 |
|
| 590 |
av_push (res_av, newRV_noinc ((SV *)av)); |
| 591 |
} |
| 592 |
|
| 593 |
if (res_av) |
| 594 |
feed_reply (res_av); |
| 595 |
} |
| 596 |
|
| 597 |
void |
| 598 |
_recv_icmp6 (...) |
| 599 |
CODE: |
| 600 |
{ |
| 601 |
struct sockaddr_in6 sa; |
| 602 |
socklen_t sl = sizeof (sa); |
| 603 |
AV *res_av = av_len (cbs) < 0 ? 0 : (AV *)sv_2mortal ((SV *)newAV ()); |
| 604 |
PKT pkt; |
| 605 |
tstamp now = NOW (); |
| 606 |
|
| 607 |
for (;;) |
| 608 |
{ |
| 609 |
int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_TRUNC, (struct sockaddr *)&sa, &sl); |
| 610 |
|
| 611 |
if (len != sizeof (PKT)) |
| 612 |
break; |
| 613 |
|
| 614 |
if (!res_av |
| 615 |
|| pkt.type != ICMP6_ECHO_REPLY |
| 616 |
|| pkt.id != (uint16_t) magic |
| 617 |
|| pkt.seq != (uint16_t)~magic |
| 618 |
|| !isnormal (pkt.stamp)) |
| 619 |
continue; |
| 620 |
|
| 621 |
AV *av = newAV (); |
| 622 |
av_push (av, newSVpvn ((char *)&sa.sin6_addr, 16)); |
| 623 |
av_push (av, newSVnv (now - pkt.stamp)); |
| 624 |
av_push (av, newSVuv (pkt.payload)); |
| 625 |
|
| 626 |
av_push (res_av, newRV_noinc ((SV *)av)); |
| 627 |
} |
| 628 |
|
| 629 |
if (res_av) |
| 630 |
feed_reply (res_av); |
| 631 |
} |
| 632 |
|
