Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 1 | #include <time.h> |
| 2 | #include <sys/types.h> |
| 3 | #include <sys/param.h> |
| 4 | #include <stdio.h> |
| 5 | #include <unistd.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <math.h> |
| 8 | #include <string.h> |
| 9 | #include <sys/time.h> |
| 10 | #include <sys/timex.h> |
| 11 | #include <errno.h> |
| 12 | #include <sys/socket.h> |
| 13 | #include <netinet/in.h> |
| 14 | #include <netinet/ip.h> |
| 15 | #include <netinet/ip_icmp.h> |
| 16 | #define TSPTYPES |
| 17 | #include <protocols/timed.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <netdb.h> |
| 20 | #include <arpa/inet.h> |
| 21 | #include <errno.h> |
| 22 | #include <linux/types.h> |
| 23 | #ifdef CAPABILITIES |
| 24 | #include <sys/capability.h> |
| 25 | #endif |
| 26 | |
| 27 | void usage(void) __attribute__((noreturn)); |
| 28 | |
| 29 | #define MAX_HOSTNAMELEN NI_MAXHOST |
| 30 | |
| 31 | /* |
| 32 | * Checksum routine for Internet Protocol family headers. |
| 33 | * |
| 34 | * This routine is very heavily used in the network |
| 35 | * code and should be modified for each CPU to be as fast as possible. |
| 36 | * |
| 37 | * This implementation is TAHOE version. |
| 38 | */ |
| 39 | |
| 40 | #undef ADDCARRY |
| 41 | #define ADDCARRY(sum) { \ |
| 42 | if (sum & 0xffff0000) { \ |
| 43 | sum &= 0xffff; \ |
| 44 | sum++; \ |
| 45 | } \ |
| 46 | } |
| 47 | |
| 48 | int in_cksum(u_short *addr, int len) |
| 49 | { |
| 50 | union word { |
| 51 | char c[2]; |
| 52 | u_short s; |
| 53 | } u; |
| 54 | int sum = 0; |
| 55 | |
| 56 | while (len > 0) { |
| 57 | /* |
| 58 | * add by words. |
| 59 | */ |
| 60 | while ((len -= 2) >= 0) { |
| 61 | if ((unsigned long)addr & 0x1) { |
| 62 | /* word is not aligned */ |
| 63 | u.c[0] = *(char *)addr; |
| 64 | u.c[1] = *((char *)addr+1); |
| 65 | sum += u.s; |
| 66 | addr++; |
| 67 | } else |
| 68 | sum += *addr++; |
| 69 | ADDCARRY(sum); |
| 70 | } |
| 71 | if (len == -1) |
| 72 | /* |
| 73 | * Odd number of bytes. |
| 74 | */ |
| 75 | u.c[0] = *(u_char *)addr; |
| 76 | } |
| 77 | if (len == -1) { |
| 78 | /* The last mbuf has odd # of bytes. Follow the |
| 79 | standard (the odd byte is shifted left by 8 bits) */ |
| 80 | u.c[1] = 0; |
| 81 | sum += u.s; |
| 82 | ADDCARRY(sum); |
| 83 | } |
| 84 | return (~sum & 0xffff); |
| 85 | } |
| 86 | |
| 87 | #define ON 1 |
| 88 | #define OFF 0 |
| 89 | |
| 90 | #define RANGE 1 /* best expected round-trip time, ms */ |
| 91 | #define MSGS 50 |
| 92 | #define TRIALS 10 |
| 93 | |
| 94 | #define GOOD 0 |
| 95 | #define UNREACHABLE 2 |
| 96 | #define NONSTDTIME 3 |
| 97 | #define HOSTDOWN 0x7fffffff |
| 98 | |
| 99 | |
| 100 | int interactive = 0; |
| 101 | uint16_t id; |
| 102 | int sock; |
| 103 | int sock_raw; |
| 104 | struct sockaddr_in server; |
| 105 | int ip_opt_len = 0; |
| 106 | |
| 107 | #define BIASP 43199999 |
| 108 | #define BIASN -43200000 |
| 109 | #define MODULO 86400000 |
| 110 | #define PROCESSING_TIME 0 /* ms. to reduce error in measurement */ |
| 111 | |
| 112 | #define PACKET_IN 1024 |
| 113 | |
| 114 | int measure_delta; |
| 115 | int measure_delta1; |
| 116 | static u_short seqno, seqno0, acked; |
| 117 | long rtt = 1000; |
| 118 | long min_rtt; |
| 119 | long rtt_sigma = 0; |
| 120 | |
| 121 | /* |
| 122 | * Measures the differences between machines' clocks using |
| 123 | * ICMP timestamp messages. |
| 124 | */ |
| 125 | int |
| 126 | measure(struct sockaddr_in * addr) |
| 127 | { |
| 128 | socklen_t length; |
| 129 | int msgcount; |
| 130 | int cc, count; |
| 131 | fd_set ready; |
| 132 | long sendtime, recvtime, histime; |
| 133 | long min1, min2, diff; |
| 134 | long delta1, delta2; |
| 135 | struct timeval tv1, tout; |
| 136 | u_char packet[PACKET_IN], opacket[64]; |
| 137 | struct icmphdr *icp = (struct icmphdr *) packet; |
| 138 | struct icmphdr *oicp = (struct icmphdr *) opacket; |
| 139 | struct iphdr *ip = (struct iphdr *) packet; |
| 140 | |
| 141 | min1 = min2 = 0x7fffffff; |
| 142 | min_rtt = 0x7fffffff; |
| 143 | measure_delta = HOSTDOWN; |
| 144 | measure_delta1 = HOSTDOWN; |
| 145 | |
| 146 | /* empties the icmp input queue */ |
| 147 | FD_ZERO(&ready); |
| 148 | |
| 149 | empty: |
| 150 | tout.tv_sec = tout.tv_usec = 0; |
| 151 | FD_SET(sock_raw, &ready); |
| 152 | if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout)) { |
| 153 | length = sizeof(struct sockaddr_in); |
| 154 | cc = recvfrom(sock_raw, (char *)packet, PACKET_IN, 0, |
| 155 | (struct sockaddr *)NULL, &length); |
| 156 | if (cc < 0) |
| 157 | return -1; |
| 158 | goto empty; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * To measure the difference, select MSGS messages whose round-trip |
| 163 | * time is smaller than RANGE if ckrange is 1, otherwise simply |
| 164 | * select MSGS messages regardless of round-trip transmission time. |
| 165 | * Choose the smallest transmission time in each of the two directions. |
| 166 | * Use these two latter quantities to compute the delta between |
| 167 | * the two clocks. |
| 168 | */ |
| 169 | |
| 170 | length = sizeof(struct sockaddr_in); |
| 171 | oicp->type = ICMP_TIMESTAMP; |
| 172 | oicp->code = 0; |
| 173 | oicp->checksum = 0; |
| 174 | oicp->un.echo.id = id; |
| 175 | ((__u32*)(oicp+1))[0] = 0; |
| 176 | ((__u32*)(oicp+1))[1] = 0; |
| 177 | ((__u32*)(oicp+1))[2] = 0; |
| 178 | FD_ZERO(&ready); |
| 179 | msgcount = 0; |
| 180 | |
| 181 | acked = seqno = seqno0 = 0; |
| 182 | |
| 183 | for (msgcount = 0; msgcount < MSGS; ) { |
| 184 | |
| 185 | /* |
| 186 | * If no answer is received for TRIALS consecutive times, |
| 187 | * the machine is assumed to be down |
| 188 | */ |
| 189 | if (seqno - acked > TRIALS) |
| 190 | return HOSTDOWN; |
| 191 | |
| 192 | oicp->un.echo.sequence = ++seqno; |
| 193 | oicp->checksum = 0; |
| 194 | |
| 195 | (void)gettimeofday (&tv1, (struct timezone *)0); |
| 196 | *(__u32*)(oicp+1) = htonl((tv1.tv_sec % (24*60*60)) * 1000 |
| 197 | + tv1.tv_usec / 1000); |
| 198 | oicp->checksum = in_cksum((u_short *)oicp, sizeof(*oicp) + 12); |
| 199 | |
| 200 | count = sendto(sock_raw, (char *)opacket, sizeof(*oicp)+12, 0, |
| 201 | (struct sockaddr *)addr, sizeof(struct sockaddr_in)); |
| 202 | |
| 203 | if (count < 0) |
| 204 | return UNREACHABLE; |
| 205 | |
| 206 | for (;;) { |
| 207 | FD_ZERO(&ready); |
| 208 | FD_SET(sock_raw, &ready); |
| 209 | { |
| 210 | long tmo = rtt + rtt_sigma; |
| 211 | tout.tv_sec = tmo/1000; |
| 212 | tout.tv_usec = (tmo - (tmo/1000)*1000)*1000; |
| 213 | } |
| 214 | |
| 215 | if ((count = select(FD_SETSIZE, &ready, (fd_set *)0, |
| 216 | (fd_set *)0, &tout)) <= 0) |
| 217 | break; |
| 218 | |
| 219 | (void)gettimeofday(&tv1, (struct timezone *)0); |
| 220 | cc = recvfrom(sock_raw, (char *)packet, PACKET_IN, 0, |
| 221 | (struct sockaddr *)NULL, &length); |
| 222 | |
| 223 | if (cc < 0) |
| 224 | return(-1); |
| 225 | |
| 226 | icp = (struct icmphdr *)(packet + (ip->ihl << 2)); |
| 227 | if( icp->type == ICMP_TIMESTAMPREPLY && |
| 228 | icp->un.echo.id == id && icp->un.echo.sequence >= seqno0 && |
| 229 | icp->un.echo.sequence <= seqno) { |
| 230 | if (acked < icp->un.echo.sequence) |
| 231 | acked = icp->un.echo.sequence; |
| 232 | |
| 233 | recvtime = (tv1.tv_sec % (24*60*60)) * 1000 + |
| 234 | tv1.tv_usec / 1000; |
| 235 | sendtime = ntohl(*(__u32*)(icp+1)); |
| 236 | diff = recvtime - sendtime; |
| 237 | /* |
| 238 | * diff can be less than 0 aroud midnight |
| 239 | */ |
| 240 | if (diff < 0) |
| 241 | continue; |
| 242 | rtt = (rtt * 3 + diff)/4; |
| 243 | rtt_sigma = (rtt_sigma *3 + abs(diff-rtt))/4; |
| 244 | msgcount++; |
| 245 | histime = ntohl(((__u32*)(icp+1))[1]); |
| 246 | /* |
| 247 | * a hosts using a time format different from |
| 248 | * ms. since midnight UT (as per RFC792) should |
| 249 | * set the high order bit of the 32-bit time |
| 250 | * value it transmits. |
| 251 | */ |
| 252 | if ((histime & 0x80000000) != 0) |
| 253 | return NONSTDTIME; |
| 254 | |
| 255 | if (interactive) { |
| 256 | printf("."); |
| 257 | fflush(stdout); |
| 258 | } |
| 259 | |
| 260 | delta1 = histime - sendtime; |
| 261 | /* |
| 262 | * Handles wrap-around to avoid that around |
| 263 | * midnight small time differences appear |
| 264 | * enormous. However, the two machine's clocks |
| 265 | * must be within 12 hours from each other. |
| 266 | */ |
| 267 | if (delta1 < BIASN) |
| 268 | delta1 += MODULO; |
| 269 | else if (delta1 > BIASP) |
| 270 | delta1 -= MODULO; |
| 271 | |
| 272 | delta2 = recvtime - histime; |
| 273 | if (delta2 < BIASN) |
| 274 | delta2 += MODULO; |
| 275 | else if (delta2 > BIASP) |
| 276 | delta2 -= MODULO; |
| 277 | |
| 278 | if (delta1 < min1) |
| 279 | min1 = delta1; |
| 280 | if (delta2 < min2) |
| 281 | min2 = delta2; |
| 282 | if (delta1 + delta2 < min_rtt) { |
| 283 | min_rtt = delta1 + delta2; |
| 284 | measure_delta1 = (delta1 - delta2)/2 + PROCESSING_TIME; |
| 285 | } |
| 286 | if (diff < RANGE) { |
| 287 | min1 = delta1; |
| 288 | min2 = delta2; |
| 289 | goto good_exit; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | good_exit: |
| 296 | measure_delta = (min1 - min2)/2 + PROCESSING_TIME; |
| 297 | return GOOD; |
| 298 | } |
| 299 | |
| 300 | char *myname, *hisname; |
| 301 | |
| 302 | int |
| 303 | measure_opt(struct sockaddr_in * addr) |
| 304 | { |
| 305 | socklen_t length; |
| 306 | int msgcount; |
| 307 | int cc, count; |
| 308 | fd_set ready; |
| 309 | long sendtime, recvtime, histime, histime1; |
| 310 | long min1, min2, diff; |
| 311 | long delta1, delta2; |
| 312 | struct timeval tv1, tout; |
| 313 | u_char packet[PACKET_IN], opacket[64]; |
| 314 | struct icmphdr *icp = (struct icmphdr *) packet; |
| 315 | struct icmphdr *oicp = (struct icmphdr *) opacket; |
| 316 | struct iphdr *ip = (struct iphdr *) packet; |
| 317 | |
| 318 | min1 = min2 = 0x7fffffff; |
| 319 | min_rtt = 0x7fffffff; |
| 320 | measure_delta = HOSTDOWN; |
| 321 | measure_delta1 = HOSTDOWN; |
| 322 | |
| 323 | /* empties the icmp input queue */ |
| 324 | FD_ZERO(&ready); |
| 325 | empty: |
| 326 | tout.tv_sec = tout.tv_usec = 0; |
| 327 | FD_SET(sock_raw, &ready); |
| 328 | if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout)) { |
| 329 | length = sizeof(struct sockaddr_in); |
| 330 | cc = recvfrom(sock_raw, (char *)packet, PACKET_IN, 0, |
| 331 | (struct sockaddr *)NULL, &length); |
| 332 | if (cc < 0) |
| 333 | return -1; |
| 334 | goto empty; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * To measure the difference, select MSGS messages whose round-trip |
| 339 | * time is smaller than RANGE if ckrange is 1, otherwise simply |
| 340 | * select MSGS messages regardless of round-trip transmission time. |
| 341 | * Choose the smallest transmission time in each of the two directions. |
| 342 | * Use these two latter quantities to compute the delta between |
| 343 | * the two clocks. |
| 344 | */ |
| 345 | |
| 346 | length = sizeof(struct sockaddr_in); |
| 347 | oicp->type = ICMP_ECHO; |
| 348 | oicp->code = 0; |
| 349 | oicp->checksum = 0; |
| 350 | oicp->un.echo.id = id; |
| 351 | ((__u32*)(oicp+1))[0] = 0; |
| 352 | ((__u32*)(oicp+1))[1] = 0; |
| 353 | ((__u32*)(oicp+1))[2] = 0; |
| 354 | |
| 355 | FD_ZERO(&ready); |
| 356 | msgcount = 0; |
| 357 | |
| 358 | acked = seqno = seqno0 = 0; |
| 359 | |
| 360 | for (msgcount = 0; msgcount < MSGS; ) { |
| 361 | |
| 362 | /* |
| 363 | * If no answer is received for TRIALS consecutive times, |
| 364 | * the machine is assumed to be down |
| 365 | */ |
| 366 | if ( seqno - acked > TRIALS) { |
| 367 | errno = EHOSTDOWN; |
| 368 | return HOSTDOWN; |
| 369 | } |
| 370 | oicp->un.echo.sequence = ++seqno; |
| 371 | oicp->checksum = 0; |
| 372 | |
| 373 | gettimeofday (&tv1, NULL); |
| 374 | ((__u32*)(oicp+1))[0] = htonl((tv1.tv_sec % (24*60*60)) * 1000 |
| 375 | + tv1.tv_usec / 1000); |
| 376 | oicp->checksum = in_cksum((u_short *)oicp, sizeof(*oicp)+12); |
| 377 | |
| 378 | count = sendto(sock_raw, (char *)opacket, sizeof(*oicp)+12, 0, |
| 379 | (struct sockaddr *)addr, sizeof(struct sockaddr_in)); |
| 380 | |
| 381 | if (count < 0) { |
| 382 | errno = EHOSTUNREACH; |
| 383 | return UNREACHABLE; |
| 384 | } |
| 385 | |
| 386 | for (;;) { |
| 387 | FD_ZERO(&ready); |
| 388 | FD_SET(sock_raw, &ready); |
| 389 | { |
| 390 | long tmo = rtt + rtt_sigma; |
| 391 | tout.tv_sec = tmo/1000; |
| 392 | tout.tv_usec = (tmo - (tmo/1000)*1000)*1000; |
| 393 | } |
| 394 | |
| 395 | if ((count = select(FD_SETSIZE, &ready, (fd_set *)0, |
| 396 | (fd_set *)0, &tout)) <= 0) |
| 397 | break; |
| 398 | |
| 399 | (void)gettimeofday(&tv1, (struct timezone *)0); |
| 400 | cc = recvfrom(sock_raw, (char *)packet, PACKET_IN, 0, |
| 401 | (struct sockaddr *)NULL, &length); |
| 402 | |
| 403 | if (cc < 0) |
| 404 | return(-1); |
| 405 | |
| 406 | icp = (struct icmphdr *)(packet + (ip->ihl << 2)); |
| 407 | if (icp->type == ICMP_ECHOREPLY && |
| 408 | packet[20] == IPOPT_TIMESTAMP && |
| 409 | icp->un.echo.id == id && |
| 410 | icp->un.echo.sequence >= seqno0 && |
| 411 | icp->un.echo.sequence <= seqno) { |
| 412 | int i; |
| 413 | __u8 *opt = packet+20; |
| 414 | |
| 415 | if (acked < icp->un.echo.sequence) |
| 416 | acked = icp->un.echo.sequence; |
| 417 | if ((opt[3]&0xF) != IPOPT_TS_PRESPEC) { |
| 418 | fprintf(stderr, "Wrong timestamp %d\n", opt[3]&0xF); |
| 419 | return NONSTDTIME; |
| 420 | } |
| 421 | if (opt[3]>>4) { |
| 422 | if ((opt[3]>>4) != 1 || ip_opt_len != 4+3*8) |
| 423 | fprintf(stderr, "Overflow %d hops\n", opt[3]>>4); |
| 424 | } |
| 425 | sendtime = recvtime = histime = histime1 = 0; |
| 426 | for (i=0; i < (opt[2]-5)/8; i++) { |
| 427 | __u32 *timep = (__u32*)(opt+4+i*8+4); |
| 428 | __u32 t = ntohl(*timep); |
| 429 | |
| 430 | if (t & 0x80000000) |
| 431 | return NONSTDTIME; |
| 432 | |
| 433 | if (i == 0) |
| 434 | sendtime = t; |
| 435 | if (i == 1) |
| 436 | histime = histime1 = t; |
| 437 | if (i == 2) { |
| 438 | if (ip_opt_len == 4+4*8) |
| 439 | histime1 = t; |
| 440 | else |
| 441 | recvtime = t; |
| 442 | } |
| 443 | if (i == 3) |
| 444 | recvtime = t; |
| 445 | } |
| 446 | |
| 447 | if (!(sendtime&histime&histime1&recvtime)) { |
| 448 | fprintf(stderr, "wrong timestamps\n"); |
| 449 | return -1; |
| 450 | } |
| 451 | |
| 452 | diff = recvtime - sendtime; |
| 453 | /* |
| 454 | * diff can be less than 0 aroud midnight |
| 455 | */ |
| 456 | if (diff < 0) |
| 457 | continue; |
| 458 | rtt = (rtt * 3 + diff)/4; |
| 459 | rtt_sigma = (rtt_sigma *3 + abs(diff-rtt))/4; |
| 460 | msgcount++; |
| 461 | |
| 462 | if (interactive) { |
| 463 | printf("."); |
| 464 | fflush(stdout); |
| 465 | } |
| 466 | |
| 467 | delta1 = histime - sendtime; |
| 468 | /* |
| 469 | * Handles wrap-around to avoid that around |
| 470 | * midnight small time differences appear |
| 471 | * enormous. However, the two machine's clocks |
| 472 | * must be within 12 hours from each other. |
| 473 | */ |
| 474 | if (delta1 < BIASN) |
| 475 | delta1 += MODULO; |
| 476 | else if (delta1 > BIASP) |
| 477 | delta1 -= MODULO; |
| 478 | |
| 479 | delta2 = recvtime - histime1; |
| 480 | if (delta2 < BIASN) |
| 481 | delta2 += MODULO; |
| 482 | else if (delta2 > BIASP) |
| 483 | delta2 -= MODULO; |
| 484 | |
| 485 | if (delta1 < min1) |
| 486 | min1 = delta1; |
| 487 | if (delta2 < min2) |
| 488 | min2 = delta2; |
| 489 | if (delta1 + delta2 < min_rtt) { |
| 490 | min_rtt = delta1 + delta2; |
| 491 | measure_delta1 = (delta1 - delta2)/2 + PROCESSING_TIME; |
| 492 | } |
| 493 | if (diff < RANGE) { |
| 494 | min1 = delta1; |
| 495 | min2 = delta2; |
| 496 | goto good_exit; |
| 497 | } |
| 498 | } |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | good_exit: |
| 503 | measure_delta = (min1 - min2)/2 + PROCESSING_TIME; |
| 504 | return GOOD; |
| 505 | } |
| 506 | |
| 507 | |
| 508 | /* |
| 509 | * Clockdiff computes the difference between the time of the machine on |
| 510 | * which it is called and the time of the machines given as argument. |
| 511 | * The time differences measured by clockdiff are obtained using a sequence |
| 512 | * of ICMP TSTAMP messages which are returned to the sender by the IP module |
| 513 | * in the remote machine. |
| 514 | * In order to compare clocks of machines in different time zones, the time |
| 515 | * is transmitted (as a 32-bit value) in milliseconds since midnight UT. |
| 516 | * If a hosts uses a different time format, it should set the high order |
| 517 | * bit of the 32-bit quantity it transmits. |
| 518 | * However, VMS apparently transmits the time in milliseconds since midnight |
| 519 | * local time (rather than GMT) without setting the high order bit. |
| 520 | * Furthermore, it does not understand daylight-saving time. This makes |
| 521 | * clockdiff behaving inconsistently with hosts running VMS. |
| 522 | * |
| 523 | * In order to reduce the sensitivity to the variance of message transmission |
| 524 | * time, clockdiff sends a sequence of messages. Yet, measures between |
| 525 | * two `distant' hosts can be affected by a small error. The error can, however, |
| 526 | * be reduced by increasing the number of messages sent in each measurement. |
| 527 | */ |
| 528 | |
| 529 | void |
| 530 | usage() { |
| 531 | fprintf(stderr, "Usage: clockdiff [-o] <host>\n"); |
| 532 | exit(1); |
| 533 | } |
| 534 | |
| 535 | void drop_rights(void) { |
| 536 | #ifdef CAPABILITIES |
| 537 | cap_t caps = cap_init(); |
| 538 | if (cap_set_proc(caps)) { |
| 539 | perror("clockdiff: cap_set_proc"); |
| 540 | exit(-1); |
| 541 | } |
| 542 | cap_free(caps); |
| 543 | #endif |
| 544 | if (setuid(getuid())) { |
| 545 | perror("clockdiff: setuid"); |
| 546 | exit(-1); |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | int |
| 551 | main(int argc, char *argv[]) |
| 552 | { |
| 553 | int measure_status; |
| 554 | struct hostent * hp; |
| 555 | char hostname[MAX_HOSTNAMELEN]; |
| 556 | int s_errno = 0; |
| 557 | int n_errno = 0; |
| 558 | |
| 559 | if (argc < 2) { |
| 560 | drop_rights(); |
| 561 | usage(); |
| 562 | } |
| 563 | |
| 564 | sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| 565 | s_errno = errno; |
| 566 | |
| 567 | errno = 0; |
| 568 | if (nice(-16) == -1) |
| 569 | n_errno = errno; |
| 570 | drop_rights(); |
| 571 | |
| 572 | if (argc == 3) { |
| 573 | if (strcmp(argv[1], "-o") == 0) { |
| 574 | ip_opt_len = 4 + 4*8; |
| 575 | argv++; |
| 576 | } else if (strcmp(argv[1], "-o1") == 0) { |
| 577 | ip_opt_len = 4 + 3*8; |
| 578 | argv++; |
| 579 | } else |
| 580 | usage(); |
| 581 | } else if (argc != 2) |
| 582 | usage(); |
| 583 | |
| 584 | if (sock_raw < 0) { |
| 585 | errno = s_errno; |
| 586 | perror("clockdiff: socket"); |
| 587 | exit(1); |
| 588 | } |
| 589 | |
| 590 | if (n_errno < 0) { |
| 591 | errno = n_errno; |
| 592 | perror("clockdiff: nice"); |
| 593 | exit(1); |
| 594 | } |
| 595 | |
| 596 | if (isatty(fileno(stdin)) && isatty(fileno(stdout))) |
| 597 | interactive = 1; |
| 598 | |
| 599 | id = getpid(); |
| 600 | |
| 601 | (void)gethostname(hostname,sizeof(hostname)); |
| 602 | hp = gethostbyname(hostname); |
| 603 | if (hp == NULL) { |
| 604 | fprintf(stderr, "clockdiff: %s: my host not found\n", hostname); |
| 605 | exit(1); |
| 606 | } |
| 607 | myname = strdup(hp->h_name); |
| 608 | |
| 609 | hp = gethostbyname(argv[1]); |
| 610 | if (hp == NULL) { |
| 611 | fprintf(stderr, "clockdiff: %s: host not found\n", argv[1]); |
| 612 | exit(1); |
| 613 | } |
| 614 | hisname = strdup(hp->h_name); |
| 615 | |
| 616 | memset(&server, 0, sizeof(server)); |
| 617 | server.sin_family = hp->h_addrtype; |
| 618 | memcpy(&(server.sin_addr.s_addr), hp->h_addr, 4); |
| 619 | |
| 620 | if (connect(sock_raw, (struct sockaddr*)&server, sizeof(server)) == -1) { |
| 621 | perror("connect"); |
| 622 | exit(1); |
| 623 | } |
| 624 | if (ip_opt_len) { |
| 625 | struct sockaddr_in myaddr; |
| 626 | socklen_t addrlen = sizeof(myaddr); |
| 627 | unsigned char rspace[ip_opt_len]; |
| 628 | |
| 629 | memset(rspace, 0, sizeof(rspace)); |
| 630 | rspace[0] = IPOPT_TIMESTAMP; |
| 631 | rspace[1] = ip_opt_len; |
| 632 | rspace[2] = 5; |
| 633 | rspace[3] = IPOPT_TS_PRESPEC; |
| 634 | if (getsockname(sock_raw, (struct sockaddr*)&myaddr, &addrlen) == -1) { |
| 635 | perror("getsockname"); |
| 636 | exit(1); |
| 637 | } |
| 638 | ((__u32*)(rspace+4))[0*2] = myaddr.sin_addr.s_addr; |
| 639 | ((__u32*)(rspace+4))[1*2] = server.sin_addr.s_addr; |
| 640 | ((__u32*)(rspace+4))[2*2] = myaddr.sin_addr.s_addr; |
| 641 | if (ip_opt_len == 4+4*8) { |
| 642 | ((__u32*)(rspace+4))[2*2] = server.sin_addr.s_addr; |
| 643 | ((__u32*)(rspace+4))[3*2] = myaddr.sin_addr.s_addr; |
| 644 | } |
| 645 | |
| 646 | if (setsockopt(sock_raw, IPPROTO_IP, IP_OPTIONS, rspace, ip_opt_len) < 0) { |
| 647 | perror("ping: IP_OPTIONS (fallback to icmp tstamps)"); |
| 648 | ip_opt_len = 0; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | if ((measure_status = (ip_opt_len ? measure_opt : measure)(&server)) < 0) { |
| 653 | if (errno) |
| 654 | perror("measure"); |
| 655 | else |
| 656 | fprintf(stderr, "measure: unknown failure\n"); |
| 657 | exit(1); |
| 658 | } |
| 659 | |
| 660 | switch (measure_status) { |
| 661 | case HOSTDOWN: |
| 662 | fprintf(stderr, "%s is down\n", hisname); |
| 663 | exit(1); |
| 664 | case NONSTDTIME: |
| 665 | fprintf(stderr, "%s time transmitted in a non-standard format\n", hisname); |
| 666 | exit(1); |
| 667 | case UNREACHABLE: |
| 668 | fprintf(stderr, "%s is unreachable\n", hisname); |
| 669 | exit(1); |
| 670 | default: |
| 671 | break; |
| 672 | } |
| 673 | |
| 674 | |
| 675 | { |
| 676 | time_t now = time(NULL); |
| 677 | |
| 678 | if (interactive) |
| 679 | printf("\nhost=%s rtt=%ld(%ld)ms/%ldms delta=%dms/%dms %s", hisname, |
| 680 | rtt, rtt_sigma, min_rtt, |
| 681 | measure_delta, measure_delta1, |
| 682 | ctime(&now)); |
| 683 | else |
| 684 | printf("%ld %d %d\n", now, measure_delta, measure_delta1); |
| 685 | } |
| 686 | exit(0); |
| 687 | } |