Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 1 | #include "ping_common.h" |
| 2 | #include <ctype.h> |
| 3 | #include <sched.h> |
| 4 | #include <math.h> |
| 5 | |
| 6 | int options; |
| 7 | |
| 8 | int mark; |
| 9 | int sndbuf; |
| 10 | int ttl; |
| 11 | int rtt; |
| 12 | int rtt_addend; |
| 13 | __u16 acked; |
| 14 | |
| 15 | struct rcvd_table rcvd_tbl; |
| 16 | |
| 17 | |
| 18 | /* counters */ |
| 19 | long npackets; /* max packets to transmit */ |
| 20 | long nreceived; /* # of packets we got back */ |
| 21 | long nrepeats; /* number of duplicates */ |
| 22 | long ntransmitted; /* sequence # for outbound packets = #sent */ |
| 23 | long nchecksum; /* replies with bad checksum */ |
| 24 | long nerrors; /* icmp errors */ |
| 25 | int interval = 1000; /* interval between packets (msec) */ |
| 26 | int preload; |
| 27 | int deadline = 0; /* time to die */ |
| 28 | int lingertime = MAXWAIT*1000; |
| 29 | struct timeval start_time, cur_time; |
| 30 | volatile int exiting; |
| 31 | volatile int status_snapshot; |
| 32 | int confirm = 0; |
| 33 | volatile int in_pr_addr = 0; /* pr_addr() is executing */ |
| 34 | jmp_buf pr_addr_jmp; |
| 35 | |
| 36 | /* Stupid workarounds for bugs/missing functionality in older linuces. |
| 37 | * confirm_flag fixes refusing service of kernels without MSG_CONFIRM. |
| 38 | * i.e. for linux-2.2 */ |
| 39 | int confirm_flag = MSG_CONFIRM; |
| 40 | /* And this is workaround for bug in IP_RECVERR on raw sockets which is present |
| 41 | * in linux-2.2.[0-19], linux-2.4.[0-7] */ |
| 42 | int working_recverr; |
| 43 | |
| 44 | /* timing */ |
| 45 | int timing; /* flag to do timing */ |
| 46 | long tmin = LONG_MAX; /* minimum round trip time */ |
| 47 | long tmax; /* maximum round trip time */ |
| 48 | /* Message for rpm maintainers: have _shame_. If you want |
| 49 | * to fix something send the patch to me for sanity checking. |
| 50 | * "sparcfix" patch is a complete non-sense, apparenly the person |
| 51 | * prepared it was stoned. |
| 52 | */ |
| 53 | long long tsum; /* sum of all times, for doing average */ |
| 54 | long long tsum2; |
| 55 | int pipesize = -1; |
| 56 | |
| 57 | int datalen = DEFDATALEN; |
| 58 | |
| 59 | char *hostname; |
| 60 | int uid; |
| 61 | uid_t euid; |
| 62 | int ident; /* process id to identify our packets */ |
| 63 | |
| 64 | static int screen_width = INT_MAX; |
| 65 | |
| 66 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 67 | |
| 68 | #ifdef CAPABILITIES |
| 69 | static cap_value_t cap_raw = CAP_NET_RAW; |
| 70 | static cap_value_t cap_admin = CAP_NET_ADMIN; |
| 71 | #endif |
| 72 | |
| 73 | void limit_capabilities(void) |
| 74 | { |
| 75 | #ifdef CAPABILITIES |
| 76 | cap_t cap_cur_p; |
| 77 | cap_t cap_p; |
| 78 | cap_flag_value_t cap_ok; |
| 79 | |
| 80 | cap_cur_p = cap_get_proc(); |
| 81 | if (!cap_cur_p) { |
| 82 | perror("ping: cap_get_proc"); |
| 83 | exit(-1); |
| 84 | } |
| 85 | |
| 86 | cap_p = cap_init(); |
| 87 | if (!cap_p) { |
| 88 | perror("ping: cap_init"); |
| 89 | exit(-1); |
| 90 | } |
| 91 | |
| 92 | cap_ok = CAP_CLEAR; |
| 93 | cap_get_flag(cap_cur_p, CAP_NET_ADMIN, CAP_PERMITTED, &cap_ok); |
| 94 | |
| 95 | if (cap_ok != CAP_CLEAR) |
| 96 | cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_admin, CAP_SET); |
| 97 | |
| 98 | cap_ok = CAP_CLEAR; |
| 99 | cap_get_flag(cap_cur_p, CAP_NET_RAW, CAP_PERMITTED, &cap_ok); |
| 100 | |
| 101 | if (cap_ok != CAP_CLEAR) |
| 102 | cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_raw, CAP_SET); |
| 103 | |
| 104 | if (cap_set_proc(cap_p) < 0) { |
| 105 | perror("ping: cap_set_proc"); |
| 106 | exit(-1); |
| 107 | } |
| 108 | |
| 109 | if (prctl(PR_SET_KEEPCAPS, 1) < 0) { |
| 110 | perror("ping: prctl"); |
| 111 | exit(-1); |
| 112 | } |
| 113 | |
| 114 | if (setuid(getuid()) < 0) { |
| 115 | perror("setuid"); |
| 116 | exit(-1); |
| 117 | } |
| 118 | |
| 119 | if (prctl(PR_SET_KEEPCAPS, 0) < 0) { |
| 120 | perror("ping: prctl"); |
| 121 | exit(-1); |
| 122 | } |
| 123 | |
| 124 | cap_free(cap_p); |
| 125 | cap_free(cap_cur_p); |
| 126 | #endif |
| 127 | uid = getuid(); |
| 128 | euid = geteuid(); |
| 129 | #ifndef CAPABILITIES |
| 130 | if (seteuid(uid)) { |
| 131 | perror("ping: setuid"); |
| 132 | exit(-1); |
| 133 | } |
| 134 | #endif |
| 135 | } |
| 136 | |
| 137 | #ifdef CAPABILITIES |
| 138 | int modify_capability(cap_value_t cap, cap_flag_value_t on) |
| 139 | { |
| 140 | cap_t cap_p = cap_get_proc(); |
| 141 | cap_flag_value_t cap_ok; |
| 142 | int rc = -1; |
| 143 | |
| 144 | if (!cap_p) { |
| 145 | perror("ping: cap_get_proc"); |
| 146 | goto out; |
| 147 | } |
| 148 | |
| 149 | cap_ok = CAP_CLEAR; |
| 150 | cap_get_flag(cap_p, cap, CAP_PERMITTED, &cap_ok); |
| 151 | if (cap_ok == CAP_CLEAR) { |
| 152 | rc = on ? -1 : 0; |
| 153 | goto out; |
| 154 | } |
| 155 | |
| 156 | cap_set_flag(cap_p, CAP_EFFECTIVE, 1, &cap, on); |
| 157 | |
| 158 | if (cap_set_proc(cap_p) < 0) { |
| 159 | perror("ping: cap_set_proc"); |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | cap_free(cap_p); |
| 164 | |
| 165 | rc = 0; |
| 166 | out: |
| 167 | if (cap_p) |
| 168 | cap_free(cap_p); |
| 169 | return rc; |
| 170 | } |
| 171 | #else |
| 172 | int modify_capability(int on) |
| 173 | { |
| 174 | if (seteuid(on ? euid : getuid())) { |
| 175 | perror("seteuid"); |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | #endif |
| 182 | |
| 183 | void drop_capabilities(void) |
| 184 | { |
| 185 | #ifdef CAPABILITIES |
| 186 | cap_t cap = cap_init(); |
| 187 | if (cap_set_proc(cap) < 0) { |
| 188 | perror("ping: cap_set_proc"); |
| 189 | exit(-1); |
| 190 | } |
| 191 | cap_free(cap); |
| 192 | #else |
| 193 | if (setuid(getuid())) { |
| 194 | perror("ping: setuid"); |
| 195 | exit(-1); |
| 196 | } |
| 197 | #endif |
| 198 | } |
| 199 | |
| 200 | /* Fills all the outpack, excluding ICMP header, but _including_ |
| 201 | * timestamp area with supplied pattern. |
| 202 | */ |
| 203 | static void fill(char *patp) |
| 204 | { |
| 205 | int ii, jj, kk; |
| 206 | int pat[16]; |
| 207 | char *cp; |
| 208 | u_char *bp = outpack+8; |
| 209 | |
| 210 | #ifdef USE_IDN |
| 211 | setlocale(LC_ALL, "C"); |
| 212 | #endif |
| 213 | |
| 214 | for (cp = patp; *cp; cp++) { |
| 215 | if (!isxdigit(*cp)) { |
| 216 | fprintf(stderr, |
| 217 | "ping: patterns must be specified as hex digits.\n"); |
| 218 | exit(2); |
| 219 | } |
| 220 | } |
| 221 | ii = sscanf(patp, |
| 222 | "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", |
| 223 | &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], |
| 224 | &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], |
| 225 | &pat[13], &pat[14], &pat[15]); |
| 226 | |
| 227 | if (ii > 0) { |
| 228 | for (kk = 0; kk <= maxpacket - (8 + ii); kk += ii) |
| 229 | for (jj = 0; jj < ii; ++jj) |
| 230 | bp[jj + kk] = pat[jj]; |
| 231 | } |
| 232 | if (!(options & F_QUIET)) { |
| 233 | printf("PATTERN: 0x"); |
| 234 | for (jj = 0; jj < ii; ++jj) |
| 235 | printf("%02x", bp[jj] & 0xFF); |
| 236 | printf("\n"); |
| 237 | } |
| 238 | |
| 239 | #ifdef USE_IDN |
| 240 | setlocale(LC_ALL, ""); |
| 241 | #endif |
| 242 | } |
| 243 | |
| 244 | void common_options(int ch) |
| 245 | { |
| 246 | switch(ch) { |
| 247 | case 'a': |
| 248 | options |= F_AUDIBLE; |
| 249 | break; |
| 250 | case 'A': |
| 251 | options |= F_ADAPTIVE; |
| 252 | break; |
| 253 | case 'c': |
| 254 | npackets = atoi(optarg); |
| 255 | if (npackets <= 0) { |
| 256 | fprintf(stderr, "ping: bad number of packets to transmit.\n"); |
| 257 | exit(2); |
| 258 | } |
| 259 | break; |
| 260 | case 'd': |
| 261 | options |= F_SO_DEBUG; |
| 262 | break; |
| 263 | case 'D': |
| 264 | options |= F_PTIMEOFDAY; |
| 265 | break; |
| 266 | case 'i': /* wait between sending packets */ |
| 267 | { |
| 268 | double dbl; |
| 269 | char *ep; |
| 270 | |
| 271 | errno = 0; |
| 272 | dbl = strtod(optarg, &ep); |
| 273 | |
| 274 | if (errno || *ep != '\0' || |
| 275 | !finite(dbl) || dbl < 0.0 || dbl >= (double)INT_MAX / 1000 - 1.0) { |
| 276 | fprintf(stderr, "ping: bad timing interval\n"); |
| 277 | exit(2); |
| 278 | } |
| 279 | |
| 280 | interval = (int)(dbl * 1000); |
| 281 | |
| 282 | options |= F_INTERVAL; |
| 283 | break; |
| 284 | } |
| 285 | case 'm': |
| 286 | { |
| 287 | char *endp; |
| 288 | mark = (int)strtoul(optarg, &endp, 10); |
| 289 | if (mark < 0 || *endp != '\0') { |
| 290 | fprintf(stderr, "mark cannot be negative\n"); |
| 291 | exit(2); |
| 292 | } |
| 293 | options |= F_MARK; |
| 294 | break; |
| 295 | } |
| 296 | case 'w': |
| 297 | deadline = atoi(optarg); |
| 298 | if (deadline < 0) { |
| 299 | fprintf(stderr, "ping: bad wait time.\n"); |
| 300 | exit(2); |
| 301 | } |
| 302 | break; |
| 303 | case 'l': |
| 304 | preload = atoi(optarg); |
| 305 | if (preload <= 0) { |
| 306 | fprintf(stderr, "ping: bad preload value, should be 1..%d\n", MAX_DUP_CHK); |
| 307 | exit(2); |
| 308 | } |
| 309 | if (preload > MAX_DUP_CHK) |
| 310 | preload = MAX_DUP_CHK; |
| 311 | if (uid && preload > 3) { |
| 312 | fprintf(stderr, "ping: cannot set preload to value > 3\n"); |
| 313 | exit(2); |
| 314 | } |
| 315 | break; |
| 316 | case 'O': |
| 317 | options |= F_OUTSTANDING; |
| 318 | break; |
| 319 | case 'S': |
| 320 | sndbuf = atoi(optarg); |
| 321 | if (sndbuf <= 0) { |
| 322 | fprintf(stderr, "ping: bad sndbuf value.\n"); |
| 323 | exit(2); |
| 324 | } |
| 325 | break; |
| 326 | case 'f': |
| 327 | options |= F_FLOOD; |
| 328 | setbuf(stdout, (char *)NULL); |
| 329 | /* fallthrough to numeric - avoid gethostbyaddr during flood */ |
| 330 | case 'n': |
| 331 | options |= F_NUMERIC; |
| 332 | break; |
| 333 | case 'p': /* fill buffer with user pattern */ |
| 334 | options |= F_PINGFILLED; |
| 335 | fill(optarg); |
| 336 | break; |
| 337 | case 'q': |
| 338 | options |= F_QUIET; |
| 339 | break; |
| 340 | case 'r': |
| 341 | options |= F_SO_DONTROUTE; |
| 342 | break; |
| 343 | case 's': /* size of packet to send */ |
| 344 | datalen = atoi(optarg); |
| 345 | if (datalen < 0) { |
| 346 | fprintf(stderr, "ping: illegal negative packet size %d.\n", datalen); |
| 347 | exit(2); |
| 348 | } |
| 349 | if (datalen > maxpacket - 8) { |
| 350 | fprintf(stderr, "ping: packet size too large: %d\n", |
| 351 | datalen); |
| 352 | exit(2); |
| 353 | } |
| 354 | break; |
| 355 | case 'v': |
| 356 | options |= F_VERBOSE; |
| 357 | break; |
| 358 | case 'L': |
| 359 | options |= F_NOLOOP; |
| 360 | break; |
| 361 | case 't': |
| 362 | options |= F_TTL; |
| 363 | ttl = atoi(optarg); |
| 364 | if (ttl < 0 || ttl > 255) { |
| 365 | fprintf(stderr, "ping: ttl %u out of range\n", ttl); |
| 366 | exit(2); |
| 367 | } |
| 368 | break; |
| 369 | case 'U': |
| 370 | options |= F_LATENCY; |
| 371 | break; |
| 372 | case 'B': |
| 373 | options |= F_STRICTSOURCE; |
| 374 | break; |
| 375 | case 'W': |
| 376 | lingertime = atoi(optarg); |
| 377 | if (lingertime < 0 || lingertime > INT_MAX/1000000) { |
| 378 | fprintf(stderr, "ping: bad linger time.\n"); |
| 379 | exit(2); |
| 380 | } |
| 381 | lingertime *= 1000; |
| 382 | break; |
| 383 | case 'V': |
| 384 | printf("ping utility, iputils-%s\n", SNAPSHOT); |
| 385 | exit(0); |
| 386 | default: |
| 387 | abort(); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | |
| 392 | static void sigexit(int signo) |
| 393 | { |
| 394 | exiting = 1; |
| 395 | if (in_pr_addr) |
| 396 | longjmp(pr_addr_jmp, 0); |
| 397 | } |
| 398 | |
| 399 | static void sigstatus(int signo) |
| 400 | { |
| 401 | status_snapshot = 1; |
| 402 | } |
| 403 | |
| 404 | |
| 405 | int __schedule_exit(int next) |
| 406 | { |
| 407 | static unsigned long waittime; |
| 408 | struct itimerval it; |
| 409 | |
| 410 | if (waittime) |
| 411 | return next; |
| 412 | |
| 413 | if (nreceived) { |
| 414 | waittime = 2 * tmax; |
| 415 | if (waittime < 1000*interval) |
| 416 | waittime = 1000*interval; |
| 417 | } else |
| 418 | waittime = lingertime*1000; |
| 419 | |
| 420 | if (next < 0 || next < waittime/1000) |
| 421 | next = waittime/1000; |
| 422 | |
| 423 | it.it_interval.tv_sec = 0; |
| 424 | it.it_interval.tv_usec = 0; |
| 425 | it.it_value.tv_sec = waittime/1000000; |
| 426 | it.it_value.tv_usec = waittime%1000000; |
| 427 | setitimer(ITIMER_REAL, &it, NULL); |
| 428 | return next; |
| 429 | } |
| 430 | |
| 431 | static inline void update_interval(void) |
| 432 | { |
| 433 | int est = rtt ? rtt/8 : interval*1000; |
| 434 | |
| 435 | interval = (est+rtt_addend+500)/1000; |
| 436 | if (uid && interval < MINUSERINTERVAL) |
| 437 | interval = MINUSERINTERVAL; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Print timestamp |
| 442 | */ |
| 443 | void print_timestamp(void) |
| 444 | { |
| 445 | if (options & F_PTIMEOFDAY) { |
| 446 | struct timeval tv; |
| 447 | gettimeofday(&tv, NULL); |
| 448 | printf("[%lu.%06lu] ", |
| 449 | (unsigned long)tv.tv_sec, (unsigned long)tv.tv_usec); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * pinger -- |
| 455 | * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet |
| 456 | * will be added on by the kernel. The ID field is our UNIX process ID, |
| 457 | * and the sequence number is an ascending integer. The first 8 bytes |
| 458 | * of the data portion are used to hold a UNIX "timeval" struct in VAX |
| 459 | * byte-order, to compute the round-trip time. |
| 460 | */ |
| 461 | int pinger(void) |
| 462 | { |
| 463 | static int oom_count; |
| 464 | static int tokens; |
| 465 | int i; |
| 466 | |
| 467 | /* Have we already sent enough? If we have, return an arbitrary positive value. */ |
| 468 | if (exiting || (npackets && ntransmitted >= npackets && !deadline)) |
| 469 | return 1000; |
| 470 | |
| 471 | /* Check that packets < rate*time + preload */ |
| 472 | if (cur_time.tv_sec == 0) { |
| 473 | gettimeofday(&cur_time, NULL); |
| 474 | tokens = interval*(preload-1); |
| 475 | } else { |
| 476 | long ntokens; |
| 477 | struct timeval tv; |
| 478 | |
| 479 | gettimeofday(&tv, NULL); |
| 480 | ntokens = (tv.tv_sec - cur_time.tv_sec)*1000 + |
| 481 | (tv.tv_usec-cur_time.tv_usec)/1000; |
| 482 | if (!interval) { |
| 483 | /* Case of unlimited flood is special; |
| 484 | * if we see no reply, they are limited to 100pps */ |
| 485 | if (ntokens < MININTERVAL && in_flight() >= preload) |
| 486 | return MININTERVAL-ntokens; |
| 487 | } |
| 488 | ntokens += tokens; |
| 489 | if (ntokens > interval*preload) |
| 490 | ntokens = interval*preload; |
| 491 | if (ntokens < interval) |
| 492 | return interval - ntokens; |
| 493 | |
| 494 | cur_time = tv; |
| 495 | tokens = ntokens - interval; |
| 496 | } |
| 497 | |
| 498 | if (options & F_OUTSTANDING) { |
| 499 | if (ntransmitted > 0 && !rcvd_test(ntransmitted)) { |
| 500 | print_timestamp(); |
| 501 | printf("no answer yet for icmp_seq=%lu\n", (ntransmitted % MAX_DUP_CHK)); |
| 502 | fflush(stdout); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | resend: |
| 507 | i = send_probe(); |
| 508 | |
| 509 | if (i == 0) { |
| 510 | oom_count = 0; |
| 511 | advance_ntransmitted(); |
| 512 | if (!(options & F_QUIET) && (options & F_FLOOD)) { |
| 513 | /* Very silly, but without this output with |
| 514 | * high preload or pipe size is very confusing. */ |
| 515 | if ((preload < screen_width && pipesize < screen_width) || |
| 516 | in_flight() < screen_width) |
| 517 | write_stdout(".", 1); |
| 518 | } |
| 519 | return interval - tokens; |
| 520 | } |
| 521 | |
| 522 | /* And handle various errors... */ |
| 523 | if (i > 0) { |
| 524 | /* Apparently, it is some fatal bug. */ |
| 525 | abort(); |
| 526 | } else if (errno == ENOBUFS || errno == ENOMEM) { |
| 527 | int nores_interval; |
| 528 | |
| 529 | /* Device queue overflow or OOM. Packet is not sent. */ |
| 530 | tokens = 0; |
| 531 | /* Slowdown. This works only in adaptive mode (option -A) */ |
| 532 | rtt_addend += (rtt < 8*50000 ? rtt/8 : 50000); |
| 533 | if (options&F_ADAPTIVE) |
| 534 | update_interval(); |
| 535 | nores_interval = SCHINT(interval/2); |
| 536 | if (nores_interval > 500) |
| 537 | nores_interval = 500; |
| 538 | oom_count++; |
| 539 | if (oom_count*nores_interval < lingertime) |
| 540 | return nores_interval; |
| 541 | i = 0; |
| 542 | /* Fall to hard error. It is to avoid complete deadlock |
| 543 | * on stuck output device even when dealine was not requested. |
| 544 | * Expected timings are screwed up in any case, but we will |
| 545 | * exit some day. :-) */ |
| 546 | } else if (errno == EAGAIN) { |
| 547 | /* Socket buffer is full. */ |
| 548 | tokens += interval; |
| 549 | return MININTERVAL; |
| 550 | } else { |
| 551 | if ((i=receive_error_msg()) > 0) { |
| 552 | /* An ICMP error arrived. */ |
| 553 | tokens += interval; |
| 554 | return MININTERVAL; |
| 555 | } |
| 556 | /* Compatibility with old linuces. */ |
| 557 | if (i == 0 && confirm_flag && errno == EINVAL) { |
| 558 | confirm_flag = 0; |
| 559 | errno = 0; |
| 560 | } |
| 561 | if (!errno) |
| 562 | goto resend; |
| 563 | } |
| 564 | |
| 565 | /* Hard local error. Pretend we sent packet. */ |
| 566 | advance_ntransmitted(); |
| 567 | |
| 568 | if (i == 0 && !(options & F_QUIET)) { |
| 569 | if (options & F_FLOOD) |
| 570 | write_stdout("E", 1); |
| 571 | else |
| 572 | perror("ping: sendmsg"); |
| 573 | } |
| 574 | tokens = 0; |
| 575 | return SCHINT(interval); |
| 576 | } |
| 577 | |
| 578 | /* Set socket buffers, "alloc" is an estimate of memory taken by single packet. */ |
| 579 | |
| 580 | void sock_setbufs(int icmp_sock, int alloc) |
| 581 | { |
| 582 | int rcvbuf, hold; |
| 583 | socklen_t tmplen = sizeof(hold); |
| 584 | |
| 585 | if (!sndbuf) |
| 586 | sndbuf = alloc; |
| 587 | setsockopt(icmp_sock, SOL_SOCKET, SO_SNDBUF, (char *)&sndbuf, sizeof(sndbuf)); |
| 588 | |
| 589 | rcvbuf = hold = alloc * preload; |
| 590 | if (hold < 65536) |
| 591 | hold = 65536; |
| 592 | setsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, sizeof(hold)); |
| 593 | if (getsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, &tmplen) == 0) { |
| 594 | if (hold < rcvbuf) |
| 595 | fprintf(stderr, "WARNING: probably, rcvbuf is not enough to hold preload.\n"); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* Protocol independent setup and parameter checks. */ |
| 600 | |
| 601 | void setup(int icmp_sock) |
| 602 | { |
| 603 | int hold; |
| 604 | struct timeval tv; |
| 605 | sigset_t sset; |
| 606 | |
| 607 | if ((options & F_FLOOD) && !(options & F_INTERVAL)) |
| 608 | interval = 0; |
| 609 | |
| 610 | if (uid && interval < MINUSERINTERVAL) { |
| 611 | fprintf(stderr, "ping: cannot flood; minimal interval, allowed for user, is %dms\n", MINUSERINTERVAL); |
| 612 | exit(2); |
| 613 | } |
| 614 | |
| 615 | if (interval >= INT_MAX/preload) { |
| 616 | fprintf(stderr, "ping: illegal preload and/or interval\n"); |
| 617 | exit(2); |
| 618 | } |
| 619 | |
| 620 | hold = 1; |
| 621 | if (options & F_SO_DEBUG) |
| 622 | setsockopt(icmp_sock, SOL_SOCKET, SO_DEBUG, (char *)&hold, sizeof(hold)); |
| 623 | if (options & F_SO_DONTROUTE) |
| 624 | setsockopt(icmp_sock, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, sizeof(hold)); |
| 625 | |
| 626 | #ifdef SO_TIMESTAMP |
| 627 | if (!(options&F_LATENCY)) { |
| 628 | int on = 1; |
| 629 | if (setsockopt(icmp_sock, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on))) |
| 630 | fprintf(stderr, "Warning: no SO_TIMESTAMP support, falling back to SIOCGSTAMP\n"); |
| 631 | } |
| 632 | #endif |
Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 633 | if (options & F_MARK) { |
| 634 | int ret; |
| 635 | |
| 636 | enable_capability_admin(); |
| 637 | ret = setsockopt(icmp_sock, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)); |
| 638 | disable_capability_admin(); |
| 639 | |
| 640 | if (ret == -1) { |
| 641 | /* we probably dont wanna exit since old kernels |
| 642 | * dont support mark .. |
| 643 | */ |
| 644 | fprintf(stderr, "Warning: Failed to set mark %d\n", mark); |
| 645 | } |
| 646 | } |
Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 647 | |
| 648 | /* Set some SNDTIMEO to prevent blocking forever |
| 649 | * on sends, when device is too slow or stalls. Just put limit |
| 650 | * of one second, or "interval", if it is less. |
| 651 | */ |
| 652 | tv.tv_sec = 1; |
| 653 | tv.tv_usec = 0; |
| 654 | if (interval < 1000) { |
| 655 | tv.tv_sec = 0; |
| 656 | tv.tv_usec = 1000 * SCHINT(interval); |
| 657 | } |
| 658 | setsockopt(icmp_sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&tv, sizeof(tv)); |
| 659 | |
| 660 | /* Set RCVTIMEO to "interval". Note, it is just an optimization |
| 661 | * allowing to avoid redundant poll(). */ |
| 662 | tv.tv_sec = SCHINT(interval)/1000; |
| 663 | tv.tv_usec = 1000*(SCHINT(interval)%1000); |
| 664 | if (setsockopt(icmp_sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(tv))) |
| 665 | options |= F_FLOOD_POLL; |
| 666 | |
| 667 | if (!(options & F_PINGFILLED)) { |
| 668 | int i; |
| 669 | u_char *p = outpack+8; |
| 670 | |
| 671 | /* Do not forget about case of small datalen, |
| 672 | * fill timestamp area too! |
| 673 | */ |
| 674 | for (i = 0; i < datalen; ++i) |
| 675 | *p++ = i; |
| 676 | } |
| 677 | |
Lorenzo Colitti | 5df1daf | 2013-07-09 17:28:09 +0900 | [diff] [blame] | 678 | if (!ident) |
| 679 | ident = htons(getpid() & 0xFFFF); |
Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 680 | |
| 681 | set_signal(SIGINT, sigexit); |
| 682 | set_signal(SIGALRM, sigexit); |
| 683 | set_signal(SIGQUIT, sigstatus); |
| 684 | |
| 685 | sigemptyset(&sset); |
| 686 | sigprocmask(SIG_SETMASK, &sset, NULL); |
| 687 | |
| 688 | gettimeofday(&start_time, NULL); |
| 689 | |
| 690 | if (deadline) { |
| 691 | struct itimerval it; |
| 692 | |
| 693 | it.it_interval.tv_sec = 0; |
| 694 | it.it_interval.tv_usec = 0; |
| 695 | it.it_value.tv_sec = deadline; |
| 696 | it.it_value.tv_usec = 0; |
| 697 | setitimer(ITIMER_REAL, &it, NULL); |
| 698 | } |
| 699 | |
| 700 | if (isatty(STDOUT_FILENO)) { |
| 701 | struct winsize w; |
| 702 | |
| 703 | if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1) { |
| 704 | if (w.ws_col > 0) |
| 705 | screen_width = w.ws_col; |
| 706 | } |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | void main_loop(int icmp_sock, __u8 *packet, int packlen) |
| 711 | { |
| 712 | char addrbuf[128]; |
| 713 | char ans_data[4096]; |
| 714 | struct iovec iov; |
| 715 | struct msghdr msg; |
| 716 | struct cmsghdr *c; |
| 717 | int cc; |
| 718 | int next; |
| 719 | int polling; |
| 720 | |
| 721 | iov.iov_base = (char *)packet; |
| 722 | |
| 723 | for (;;) { |
| 724 | /* Check exit conditions. */ |
| 725 | if (exiting) |
| 726 | break; |
| 727 | if (npackets && nreceived + nerrors >= npackets) |
| 728 | break; |
| 729 | if (deadline && nerrors) |
| 730 | break; |
| 731 | /* Check for and do special actions. */ |
| 732 | if (status_snapshot) |
| 733 | status(); |
| 734 | |
| 735 | /* Send probes scheduled to this time. */ |
| 736 | do { |
| 737 | next = pinger(); |
| 738 | next = schedule_exit(next); |
| 739 | } while (next <= 0); |
| 740 | |
| 741 | /* "next" is time to send next probe, if positive. |
| 742 | * If next<=0 send now or as soon as possible. */ |
| 743 | |
| 744 | /* Technical part. Looks wicked. Could be dropped, |
| 745 | * if everyone used the newest kernel. :-) |
| 746 | * Its purpose is: |
| 747 | * 1. Provide intervals less than resolution of scheduler. |
| 748 | * Solution: spinning. |
| 749 | * 2. Avoid use of poll(), when recvmsg() can provide |
| 750 | * timed waiting (SO_RCVTIMEO). */ |
| 751 | polling = 0; |
| 752 | if ((options & (F_ADAPTIVE|F_FLOOD_POLL)) || next<SCHINT(interval)) { |
| 753 | int recv_expected = in_flight(); |
| 754 | |
| 755 | /* If we are here, recvmsg() is unable to wait for |
| 756 | * required timeout. */ |
| 757 | if (1000 % HZ == 0 ? next <= 1000 / HZ : (next < INT_MAX / HZ && next * HZ <= 1000)) { |
| 758 | /* Very short timeout... So, if we wait for |
| 759 | * something, we sleep for MININTERVAL. |
| 760 | * Otherwise, spin! */ |
| 761 | if (recv_expected) { |
| 762 | next = MININTERVAL; |
| 763 | } else { |
| 764 | next = 0; |
| 765 | /* When spinning, no reasons to poll. |
| 766 | * Use nonblocking recvmsg() instead. */ |
| 767 | polling = MSG_DONTWAIT; |
| 768 | /* But yield yet. */ |
| 769 | sched_yield(); |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | if (!polling && |
| 774 | ((options & (F_ADAPTIVE|F_FLOOD_POLL)) || interval)) { |
| 775 | struct pollfd pset; |
| 776 | pset.fd = icmp_sock; |
| 777 | pset.events = POLLIN|POLLERR; |
| 778 | pset.revents = 0; |
| 779 | if (poll(&pset, 1, next) < 1 || |
| 780 | !(pset.revents&(POLLIN|POLLERR))) |
| 781 | continue; |
| 782 | polling = MSG_DONTWAIT; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | for (;;) { |
| 787 | struct timeval *recv_timep = NULL; |
| 788 | struct timeval recv_time; |
| 789 | int not_ours = 0; /* Raw socket can receive messages |
| 790 | * destined to other running pings. */ |
| 791 | |
| 792 | iov.iov_len = packlen; |
| 793 | memset(&msg, 0, sizeof(msg)); |
| 794 | msg.msg_name = addrbuf; |
| 795 | msg.msg_namelen = sizeof(addrbuf); |
| 796 | msg.msg_iov = &iov; |
| 797 | msg.msg_iovlen = 1; |
| 798 | msg.msg_control = ans_data; |
| 799 | msg.msg_controllen = sizeof(ans_data); |
| 800 | |
| 801 | cc = recvmsg(icmp_sock, &msg, polling); |
| 802 | polling = MSG_DONTWAIT; |
| 803 | |
| 804 | if (cc < 0) { |
| 805 | if (errno == EAGAIN || errno == EINTR) |
| 806 | break; |
| 807 | if (!receive_error_msg()) { |
| 808 | if (errno) { |
| 809 | perror("ping: recvmsg"); |
| 810 | break; |
| 811 | } |
| 812 | not_ours = 1; |
| 813 | } |
| 814 | } else { |
| 815 | |
| 816 | #ifdef SO_TIMESTAMP |
| 817 | for (c = CMSG_FIRSTHDR(&msg); c; c = CMSG_NXTHDR(&msg, c)) { |
| 818 | if (c->cmsg_level != SOL_SOCKET || |
| 819 | c->cmsg_type != SO_TIMESTAMP) |
| 820 | continue; |
| 821 | if (c->cmsg_len < CMSG_LEN(sizeof(struct timeval))) |
| 822 | continue; |
| 823 | recv_timep = (struct timeval*)CMSG_DATA(c); |
| 824 | } |
| 825 | #endif |
| 826 | |
| 827 | if ((options&F_LATENCY) || recv_timep == NULL) { |
| 828 | if ((options&F_LATENCY) || |
| 829 | ioctl(icmp_sock, SIOCGSTAMP, &recv_time)) |
| 830 | gettimeofday(&recv_time, NULL); |
| 831 | recv_timep = &recv_time; |
| 832 | } |
| 833 | |
| 834 | not_ours = parse_reply(&msg, cc, addrbuf, recv_timep); |
| 835 | } |
| 836 | |
| 837 | /* See? ... someone runs another ping on this host. */ |
| 838 | if (not_ours) |
| 839 | install_filter(); |
| 840 | |
| 841 | /* If nothing is in flight, "break" returns us to pinger. */ |
| 842 | if (in_flight() == 0) |
| 843 | break; |
| 844 | |
| 845 | /* Otherwise, try to recvmsg() again. recvmsg() |
| 846 | * is nonblocking after the first iteration, so that |
| 847 | * if nothing is queued, it will receive EAGAIN |
| 848 | * and return to pinger. */ |
| 849 | } |
| 850 | } |
| 851 | finish(); |
| 852 | } |
| 853 | |
| 854 | int gather_statistics(__u8 *icmph, int icmplen, |
| 855 | int cc, __u16 seq, int hops, |
| 856 | int csfailed, struct timeval *tv, char *from, |
| 857 | void (*pr_reply)(__u8 *icmph, int cc)) |
| 858 | { |
| 859 | int dupflag = 0; |
| 860 | long triptime = 0; |
| 861 | __u8 *ptr = icmph + icmplen; |
| 862 | |
| 863 | ++nreceived; |
| 864 | if (!csfailed) |
| 865 | acknowledge(seq); |
| 866 | |
| 867 | if (timing && cc >= 8+sizeof(struct timeval)) { |
| 868 | struct timeval tmp_tv; |
| 869 | memcpy(&tmp_tv, ptr, sizeof(tmp_tv)); |
| 870 | |
| 871 | restamp: |
| 872 | tvsub(tv, &tmp_tv); |
| 873 | triptime = tv->tv_sec * 1000000 + tv->tv_usec; |
| 874 | if (triptime < 0) { |
| 875 | fprintf(stderr, "Warning: time of day goes back (%ldus), taking countermeasures.\n", triptime); |
| 876 | triptime = 0; |
| 877 | if (!(options & F_LATENCY)) { |
| 878 | gettimeofday(tv, NULL); |
| 879 | options |= F_LATENCY; |
| 880 | goto restamp; |
| 881 | } |
| 882 | } |
| 883 | if (!csfailed) { |
| 884 | tsum += triptime; |
| 885 | tsum2 += (long long)triptime * (long long)triptime; |
| 886 | if (triptime < tmin) |
| 887 | tmin = triptime; |
| 888 | if (triptime > tmax) |
| 889 | tmax = triptime; |
| 890 | if (!rtt) |
| 891 | rtt = triptime*8; |
| 892 | else |
| 893 | rtt += triptime-rtt/8; |
| 894 | if (options&F_ADAPTIVE) |
| 895 | update_interval(); |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | if (csfailed) { |
| 900 | ++nchecksum; |
| 901 | --nreceived; |
| 902 | } else if (rcvd_test(seq)) { |
| 903 | ++nrepeats; |
| 904 | --nreceived; |
| 905 | dupflag = 1; |
| 906 | } else { |
| 907 | rcvd_set(seq); |
| 908 | dupflag = 0; |
| 909 | } |
| 910 | confirm = confirm_flag; |
| 911 | |
| 912 | if (options & F_QUIET) |
| 913 | return 1; |
| 914 | |
| 915 | if (options & F_FLOOD) { |
| 916 | if (!csfailed) |
| 917 | write_stdout("\b \b", 3); |
| 918 | else |
| 919 | write_stdout("\bC", 2); |
| 920 | } else { |
| 921 | int i; |
| 922 | __u8 *cp, *dp; |
| 923 | |
| 924 | print_timestamp(); |
| 925 | printf("%d bytes from %s:", cc, from); |
| 926 | |
| 927 | if (pr_reply) |
| 928 | pr_reply(icmph, cc); |
| 929 | |
| 930 | if (hops >= 0) |
| 931 | printf(" ttl=%d", hops); |
| 932 | |
| 933 | if (cc < datalen+8) { |
| 934 | printf(" (truncated)\n"); |
| 935 | return 1; |
| 936 | } |
| 937 | if (timing) { |
| 938 | if (triptime >= 100000) |
| 939 | printf(" time=%ld ms", triptime/1000); |
| 940 | else if (triptime >= 10000) |
| 941 | printf(" time=%ld.%01ld ms", triptime/1000, |
| 942 | (triptime%1000)/100); |
| 943 | else if (triptime >= 1000) |
| 944 | printf(" time=%ld.%02ld ms", triptime/1000, |
| 945 | (triptime%1000)/10); |
| 946 | else |
| 947 | printf(" time=%ld.%03ld ms", triptime/1000, |
| 948 | triptime%1000); |
| 949 | } |
| 950 | if (dupflag) |
| 951 | printf(" (DUP!)"); |
| 952 | if (csfailed) |
| 953 | printf(" (BAD CHECKSUM!)"); |
| 954 | |
| 955 | /* check the data */ |
| 956 | cp = ((u_char*)ptr) + sizeof(struct timeval); |
| 957 | dp = &outpack[8 + sizeof(struct timeval)]; |
| 958 | for (i = sizeof(struct timeval); i < datalen; ++i, ++cp, ++dp) { |
| 959 | if (*cp != *dp) { |
| 960 | printf("\nwrong data byte #%d should be 0x%x but was 0x%x", |
| 961 | i, *dp, *cp); |
| 962 | cp = (u_char*)ptr + sizeof(struct timeval); |
| 963 | for (i = sizeof(struct timeval); i < datalen; ++i, ++cp) { |
| 964 | if ((i % 32) == sizeof(struct timeval)) |
| 965 | printf("\n#%d\t", i); |
| 966 | printf("%x ", *cp); |
| 967 | } |
| 968 | break; |
| 969 | } |
| 970 | } |
| 971 | } |
| 972 | return 0; |
| 973 | } |
| 974 | |
| 975 | static long llsqrt(long long a) |
| 976 | { |
| 977 | long long prev = ~((long long)1 << 63); |
| 978 | long long x = a; |
| 979 | |
| 980 | if (x > 0) { |
| 981 | while (x < prev) { |
| 982 | prev = x; |
| 983 | x = (x+(a/x))/2; |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | return (long)x; |
| 988 | } |
| 989 | |
| 990 | /* |
| 991 | * finish -- |
| 992 | * Print out statistics, and give up. |
| 993 | */ |
| 994 | void finish(void) |
| 995 | { |
| 996 | struct timeval tv = cur_time; |
| 997 | char *comma = ""; |
| 998 | |
| 999 | tvsub(&tv, &start_time); |
| 1000 | |
| 1001 | putchar('\n'); |
| 1002 | fflush(stdout); |
| 1003 | printf("--- %s ping statistics ---\n", hostname); |
| 1004 | printf("%ld packets transmitted, ", ntransmitted); |
| 1005 | printf("%ld received", nreceived); |
| 1006 | if (nrepeats) |
| 1007 | printf(", +%ld duplicates", nrepeats); |
| 1008 | if (nchecksum) |
| 1009 | printf(", +%ld corrupted", nchecksum); |
| 1010 | if (nerrors) |
| 1011 | printf(", +%ld errors", nerrors); |
| 1012 | if (ntransmitted) { |
| 1013 | printf(", %d%% packet loss", |
| 1014 | (int) ((((long long)(ntransmitted - nreceived)) * 100) / |
| 1015 | ntransmitted)); |
| 1016 | printf(", time %ldms", 1000*tv.tv_sec+tv.tv_usec/1000); |
| 1017 | } |
| 1018 | putchar('\n'); |
| 1019 | |
| 1020 | if (nreceived && timing) { |
| 1021 | long tmdev; |
| 1022 | |
| 1023 | tsum /= nreceived + nrepeats; |
| 1024 | tsum2 /= nreceived + nrepeats; |
| 1025 | tmdev = llsqrt(tsum2 - tsum * tsum); |
| 1026 | |
| 1027 | printf("rtt min/avg/max/mdev = %ld.%03ld/%lu.%03ld/%ld.%03ld/%ld.%03ld ms", |
| 1028 | (long)tmin/1000, (long)tmin%1000, |
| 1029 | (unsigned long)(tsum/1000), (long)(tsum%1000), |
| 1030 | (long)tmax/1000, (long)tmax%1000, |
| 1031 | (long)tmdev/1000, (long)tmdev%1000 |
| 1032 | ); |
| 1033 | comma = ", "; |
| 1034 | } |
| 1035 | if (pipesize > 1) { |
| 1036 | printf("%spipe %d", comma, pipesize); |
| 1037 | comma = ", "; |
| 1038 | } |
| 1039 | if (nreceived && (!interval || (options&(F_FLOOD|F_ADAPTIVE))) && ntransmitted > 1) { |
| 1040 | int ipg = (1000000*(long long)tv.tv_sec+tv.tv_usec)/(ntransmitted-1); |
| 1041 | printf("%sipg/ewma %d.%03d/%d.%03d ms", |
| 1042 | comma, ipg/1000, ipg%1000, rtt/8000, (rtt/8)%1000); |
| 1043 | } |
| 1044 | putchar('\n'); |
| 1045 | exit(!nreceived || (deadline && nreceived < npackets)); |
| 1046 | } |
| 1047 | |
| 1048 | |
| 1049 | void status(void) |
| 1050 | { |
| 1051 | int loss = 0; |
| 1052 | long tavg = 0; |
| 1053 | |
| 1054 | status_snapshot = 0; |
| 1055 | |
| 1056 | if (ntransmitted) |
| 1057 | loss = (((long long)(ntransmitted - nreceived)) * 100) / ntransmitted; |
| 1058 | |
| 1059 | fprintf(stderr, "\r%ld/%ld packets, %d%% loss", ntransmitted, nreceived, loss); |
| 1060 | |
| 1061 | if (nreceived && timing) { |
| 1062 | tavg = tsum / (nreceived + nrepeats); |
| 1063 | |
| 1064 | fprintf(stderr, ", min/avg/ewma/max = %ld.%03ld/%lu.%03ld/%d.%03d/%ld.%03ld ms", |
| 1065 | (long)tmin/1000, (long)tmin%1000, |
| 1066 | tavg/1000, tavg%1000, |
| 1067 | rtt/8000, (rtt/8)%1000, |
| 1068 | (long)tmax/1000, (long)tmax%1000 |
| 1069 | ); |
| 1070 | } |
| 1071 | fprintf(stderr, "\n"); |
| 1072 | } |
| 1073 | |