release/src/router/busybox/networking/ping.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini ping implementation for busybox
   4  *
   5  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
   6  *
   7  * Adapted from the ping in netkit-base 0.10:
   8  * Copyright (c) 1989 The Regents of the University of California.
   9  * All rights reserved.
  10  *
  11  * This code is derived from software contributed to Berkeley by
  12  * Mike Muuss.
  13  *
  14  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  15  */
  16 /* from ping6.c:
  17  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
  18  *
  19  * This version of ping is adapted from the ping in netkit-base 0.10,
  20  * which is:
  21  *
  22  * Original copyright notice is retained at the end of this file.
  23  *
  24  * This version is an adaptation of ping.c from busybox.
  25  * The code was modified by Bart Visscher <magick@linux-fan.com>
  26  */
  27
  28 #include <net/if.h>
  29 #include <netinet/ip_icmp.h>
  30 #include "libbb.h"
  31
  32 #ifdef __BIONIC__
  33 /* should be in netinet/ip_icmp.h */
  34 # define ICMP_DEST_UNREACH    3  /* Destination Unreachable  */
  35 # define ICMP_SOURCE_QUENCH   4  /* Source Quench    */
  36 # define ICMP_REDIRECT        5  /* Redirect (change route)  */
  37 # define ICMP_ECHO            8  /* Echo Request      */
  38 # define ICMP_TIME_EXCEEDED  11  /* Time Exceeded    */
  39 # define ICMP_PARAMETERPROB  12  /* Parameter Problem    */
  40 # define ICMP_TIMESTAMP      13  /* Timestamp Request    */
  41 # define ICMP_TIMESTAMPREPLY 14  /* Timestamp Reply    */
  42 # define ICMP_INFO_REQUEST   15  /* Information Request    */
  43 # define ICMP_INFO_REPLY     16  /* Information Reply    */
  44 # define ICMP_ADDRESS        17  /* Address Mask Request    */
  45 # define ICMP_ADDRESSREPLY   18  /* Address Mask Reply    */
  46 #endif
  47
  48 //config:config PING
  49 //config:       bool "ping"
  50 //config:       default y
  51 //config:       select PLATFORM_LINUX
  52 //config:       help
  53 //config:         ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
  54 //config:         elicit an ICMP ECHO_RESPONSE from a host or gateway.
  55 //config:
  56 //config:config PING6
  57 //config:       bool "ping6"
  58 //config:       default y
  59 //config:       depends on FEATURE_IPV6 && PING
  60 //config:       help
  61 //config:         This will give you a ping that can talk IPv6.
  62 //config:
  63 //config:config FEATURE_FANCY_PING
  64 //config:       bool "Enable fancy ping output"
  65 //config:       default y
  66 //config:       depends on PING
  67 //config:       help
  68 //config:         Make the output from the ping applet include statistics, and at the
  69 //config:         same time provide full support for ICMP packets.
  70
  71 /* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */
  72 //applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE))
  73 //applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE))
  74
  75 //kbuild:lib-$(CONFIG_PING)  += ping.o
  76 //kbuild:lib-$(CONFIG_PING6) += ping.o
  77
  78 //usage:#if !ENABLE_FEATURE_FANCY_PING
  79 //usage:# define ping_trivial_usage
  80 //usage:       "HOST"
  81 //usage:# define ping_full_usage "\n\n"
  82 //usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
  83 //usage:# define ping6_trivial_usage
  84 //usage:       "HOST"
  85 //usage:# define ping6_full_usage "\n\n"
  86 //usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
  87 //usage:#else
  88 //usage:# define ping_trivial_usage
  89 //usage:       "[OPTIONS] HOST"
  90 //usage:# define ping_full_usage "\n\n"
  91 //usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
  92 //usage:     "\n        -4,-6           Force IP or IPv6 name resolution"
  93 //usage:     "\n        -c CNT          Send only CNT pings"
  94 //usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
  95 //usage:     "\n        -t TTL          Set TTL"
  96 //usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
  97 //usage:     "\n        -W SEC          Seconds to wait for the first response (default:10)"
  98 //usage:     "\n                        (after all -c CNT packets are sent)"
  99 //usage:     "\n        -w SEC          Seconds until ping exits (default:infinite)"
 100 //usage:     "\n                        (can exit earlier with -c CNT)"
 101 //usage:     "\n        -q              Quiet, only displays output at start"
 102 //usage:     "\n                        and when finished"
 103 //usage:
 104 //usage:# define ping6_trivial_usage
 105 //usage:       "[OPTIONS] HOST"
 106 //usage:# define ping6_full_usage "\n\n"
 107 //usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
 108 //usage:     "\n        -c CNT          Send only CNT pings"
 109 //usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
 110 //usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
 111 //usage:     "\n        -q              Quiet, only displays output at start"
 112 //usage:     "\n                        and when finished"
 113 //usage:
 114 //usage:#endif
 115 //usage:
 116 //usage:#define ping_example_usage
 117 //usage:       "$ ping localhost\n"
 118 //usage:       "PING slag (127.0.0.1): 56 data bytes\n"
 119 //usage:       "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
 120 //usage:       "\n"
 121 //usage:       "--- debian ping statistics ---\n"
 122 //usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
 123 //usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
 124 //usage:#define ping6_example_usage
 125 //usage:       "$ ping6 ip6-localhost\n"
 126 //usage:       "PING ip6-localhost (::1): 56 data bytes\n"
 127 //usage:       "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
 128 //usage:       "\n"
 129 //usage:       "--- ip6-localhost ping statistics ---\n"
 130 //usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
 131 //usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
 132
 133 #if ENABLE_PING6
 134 # include <netinet/icmp6.h>
 135 /* I see RENUMBERED constants in bits/in.h - !!?
 136  * What a fuck is going on with libc? Is it a glibc joke? */
 137 # ifdef IPV6_2292HOPLIMIT
 138 #  undef IPV6_HOPLIMIT
 139 #  define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
 140 # endif
 141 #endif
 142
 143 enum {
 144         DEFDATALEN = 56,
 145         MAXIPLEN = 60,
 146         MAXICMPLEN = 76,
 147         MAX_DUP_CHK = (8 * 128),
 148         MAXWAIT = 10,
 149         PINGINTERVAL = 1, /* 1 second */
 150 };
 151
 152 #if !ENABLE_FEATURE_FANCY_PING
 153
 154 /* Simple version */
 155
 156 struct globals {
 157         char *hostname;
 158         char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 159 } FIX_ALIASING;
 160 #define G (*(struct globals*)&bb_common_bufsiz1)
 161 #define INIT_G() do { } while (0)
 162
 163 static void noresp(int ign UNUSED_PARAM)
 164 {
 165         printf("No response from %s\n", G.hostname);
 166         exit(EXIT_FAILURE);
 167 }
 168
 169 static void ping4(len_and_sockaddr *lsa)
 170 {
 171         struct icmp *pkt;
 172         int pingsock, c;
 173
 174         pingsock = create_icmp_socket();
 175
 176         pkt = (struct icmp *) G.packet;
 177         memset(pkt, 0, sizeof(G.packet));
 178         pkt->icmp_type = ICMP_ECHO;
 179         pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));
 180
 181         xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
 182
 183         /* listen for replies */
 184         while (1) {
 185                 struct sockaddr_in from;
 186                 socklen_t fromlen = sizeof(from);
 187
 188                 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
 189                                 (struct sockaddr *) &from, &fromlen);
 190                 if (c < 0) {
 191                         if (errno != EINTR)
 192                                 bb_perror_msg("recvfrom");
 193                         continue;
 194                 }
 195                 if (c >= 76) {                  /* ip + icmp */
 196                         struct iphdr *iphdr = (struct iphdr *) G.packet;
 197
 198                         pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));   /* skip ip hdr */
 199                         if (pkt->icmp_type == ICMP_ECHOREPLY)
 200                                 break;
 201                 }
 202         }
 203         if (ENABLE_FEATURE_CLEAN_UP)
 204                 close(pingsock);
 205 }
 206
 207 #if ENABLE_PING6
 208 static void ping6(len_and_sockaddr *lsa)
 209 {
 210         struct icmp6_hdr *pkt;
 211         int pingsock, c;
 212         int sockopt;
 213
 214         pingsock = create_icmp6_socket();
 215
 216         pkt = (struct icmp6_hdr *) G.packet;
 217         memset(pkt, 0, sizeof(G.packet));
 218         pkt->icmp6_type = ICMP6_ECHO_REQUEST;
 219
 220         sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 221         setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
 222
 223         xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
 224
 225         /* listen for replies */
 226         while (1) {
 227                 struct sockaddr_in6 from;
 228                 socklen_t fromlen = sizeof(from);
 229
 230                 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
 231                                 (struct sockaddr *) &from, &fromlen);
 232                 if (c < 0) {
 233                         if (errno != EINTR)
 234                                 bb_perror_msg("recvfrom");
 235                         continue;
 236                 }
 237                 if (c >= ICMP_MINLEN) {                 /* icmp6_hdr */
 238                         pkt = (struct icmp6_hdr *) G.packet;
 239                         if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
 240                                 break;
 241                 }
 242         }
 243         if (ENABLE_FEATURE_CLEAN_UP)
 244                 close(pingsock);
 245 }
 246 #endif
 247
 248 #if !ENABLE_PING6
 249 # define common_ping_main(af, argv) common_ping_main(argv)
 250 #endif
 251 static int common_ping_main(sa_family_t af, char **argv)
 252 {
 253         len_and_sockaddr *lsa;
 254
 255         INIT_G();
 256
 257 #if ENABLE_PING6
 258         while ((++argv)[0] && argv[0][0] == '-') {
 259                 if (argv[0][1] == '4') {
 260                         af = AF_INET;
 261                         continue;
 262                 }
 263                 if (argv[0][1] == '6') {
 264                         af = AF_INET6;
 265                         continue;
 266                 }
 267                 bb_show_usage();
 268         }
 269 #else
 270         argv++;
 271 #endif
 272
 273         G.hostname = *argv;
 274         if (!G.hostname)
 275                 bb_show_usage();
 276
 277 #if ENABLE_PING6
 278         lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
 279 #else
 280         lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
 281 #endif
 282         /* Set timer _after_ DNS resolution */
 283         signal(SIGALRM, noresp);
 284         alarm(5); /* give the host 5000ms to respond */
 285
 286 #if ENABLE_PING6
 287         if (lsa->u.sa.sa_family == AF_INET6)
 288                 ping6(lsa);
 289         else
 290 #endif
 291                 ping4(lsa);
 292         printf("%s is alive!\n", G.hostname);
 293         return EXIT_SUCCESS;
 294 }
 295
 296
 297 #else /* FEATURE_FANCY_PING */
 298
 299
 300 /* Full(er) version */
 301
 302 #define OPT_STRING ("qvc:s:t:w:W:I:4" IF_PING6("6"))
 303 enum {
 304         OPT_QUIET = 1 << 0,
 305         OPT_VERBOSE = 1 << 1,
 306         OPT_c = 1 << 2,
 307         OPT_s = 1 << 3,
 308         OPT_t = 1 << 4,
 309         OPT_w = 1 << 5,
 310         OPT_W = 1 << 6,
 311         OPT_I = 1 << 7,
 312         OPT_IPV4 = 1 << 8,
 313         OPT_IPV6 = (1 << 9) * ENABLE_PING6,
 314 };
 315
 316
 317 struct globals {
 318         int pingsock;
 319         int if_index;
 320         char *str_I;
 321         len_and_sockaddr *source_lsa;
 322         unsigned datalen;
 323         unsigned pingcount; /* must be int-sized */
 324         unsigned opt_ttl;
 325         unsigned long ntransmitted, nreceived, nrepeats;
 326         uint16_t myid;
 327         unsigned tmin, tmax; /* in us */
 328         unsigned long long tsum; /* in us, sum of all times */
 329         unsigned deadline;
 330         unsigned timeout;
 331         unsigned total_secs;
 332         unsigned sizeof_rcv_packet;
 333         char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
 334         void *snd_packet; /* [datalen + ipv4/ipv6_const] */
 335         const char *hostname;
 336         const char *dotted;
 337         union {
 338                 struct sockaddr sa;
 339                 struct sockaddr_in sin;
 340 #if ENABLE_PING6
 341                 struct sockaddr_in6 sin6;
 342 #endif
 343         } pingaddr;
 344         char rcvd_tbl[MAX_DUP_CHK / 8];
 345 } FIX_ALIASING;
 346 #define G (*(struct globals*)&bb_common_bufsiz1)
 347 #define pingsock     (G.pingsock    )
 348 #define if_index     (G.if_index    )
 349 #define source_lsa   (G.source_lsa  )
 350 #define str_I        (G.str_I       )
 351 #define datalen      (G.datalen     )
 352 #define ntransmitted (G.ntransmitted)
 353 #define nreceived    (G.nreceived   )
 354 #define nrepeats     (G.nrepeats    )
 355 #define pingcount    (G.pingcount   )
 356 #define opt_ttl      (G.opt_ttl     )
 357 #define myid         (G.myid        )
 358 #define tmin         (G.tmin        )
 359 #define tmax         (G.tmax        )
 360 #define tsum         (G.tsum        )
 361 #define deadline     (G.deadline    )
 362 #define timeout      (G.timeout     )
 363 #define total_secs   (G.total_secs  )
 364 #define hostname     (G.hostname    )
 365 #define dotted       (G.dotted      )
 366 #define pingaddr     (G.pingaddr    )
 367 #define rcvd_tbl     (G.rcvd_tbl    )
 368 void BUG_ping_globals_too_big(void);
 369 #define INIT_G() do { \
 370         if (sizeof(G) > COMMON_BUFSIZE) \
 371                 BUG_ping_globals_too_big(); \
 372         pingsock = -1; \
 373         datalen = DEFDATALEN; \
 374         timeout = MAXWAIT; \
 375         tmin = UINT_MAX; \
 376 } while (0)
 377
 378
 379 #define A(bit)          rcvd_tbl[(bit)>>3]      /* identify byte in array */
 380 #define B(bit)          (1 << ((bit) & 0x07))   /* identify bit in byte */
 381 #define SET(bit)        (A(bit) |= B(bit))
 382 #define CLR(bit)        (A(bit) &= (~B(bit)))
 383 #define TST(bit)        (A(bit) & B(bit))
 384
 385 /**************************************************************************/
 386
 387 static void print_stats_and_exit(int junk) NORETURN;
 388 static void print_stats_and_exit(int junk UNUSED_PARAM)
 389 {
 390         signal(SIGINT, SIG_IGN);
 391
 392         printf("\n--- %s ping statistics ---\n", hostname);
 393         printf("%lu packets transmitted, ", ntransmitted);
 394         printf("%lu packets received, ", nreceived);
 395         if (nrepeats)
 396                 printf("%lu duplicates, ", nrepeats);
 397         if (ntransmitted)
 398                 ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
 399         printf("%lu%% packet loss\n", ntransmitted);
 400         if (tmin != UINT_MAX) {
 401                 unsigned tavg = tsum / (nreceived + nrepeats);
 402                 printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
 403                         tmin / 1000, tmin % 1000,
 404                         tavg / 1000, tavg % 1000,
 405                         tmax / 1000, tmax % 1000);
 406         }
 407         /* if condition is true, exit with 1 -- 'failure' */
 408         exit(nreceived == 0 || (deadline && nreceived < pingcount));
 409 }
 410
 411 static void sendping_tail(void (*sp)(int), int size_pkt)
 412 {
 413         int sz;
 414
 415         CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
 416         ntransmitted++;
 417
 418         size_pkt += datalen;
 419
 420         /* sizeof(pingaddr) can be larger than real sa size, but I think
 421          * it doesn't matter */
 422         sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
 423         if (sz != size_pkt)
 424                 bb_error_msg_and_die(bb_msg_write_error);
 425
 426         if (pingcount == 0 || deadline || ntransmitted < pingcount) {
 427                 /* Didn't send all pings yet - schedule next in 1s */
 428                 signal(SIGALRM, sp);
 429                 if (deadline) {
 430                         total_secs += PINGINTERVAL;
 431                         if (total_secs >= deadline)
 432                                 signal(SIGALRM, print_stats_and_exit);
 433                 }
 434                 alarm(PINGINTERVAL);
 435         } else { /* -c NN, and all NN are sent (and no deadline) */
 436                 /* Wait for the last ping to come back.
 437                  * -W timeout: wait for a response in seconds.
 438                  * Affects only timeout in absense of any responses,
 439                  * otherwise ping waits for two RTTs. */
 440                 unsigned expire = timeout;
 441
 442                 if (nreceived) {
 443                         /* approx. 2*tmax, in seconds (2 RTT) */
 444                         expire = tmax / (512*1024);
 445                         if (expire == 0)
 446                                 expire = 1;
 447                 }
 448                 signal(SIGALRM, print_stats_and_exit);
 449                 alarm(expire);
 450         }
 451 }
 452
 453 static void sendping4(int junk UNUSED_PARAM)
 454 {
 455         struct icmp *pkt = G.snd_packet;
 456
 457         //memset(pkt, 0, datalen + ICMP_MINLEN + 4); - G.snd_packet was xzalloced
 458         pkt->icmp_type = ICMP_ECHO;
 459         /*pkt->icmp_code = 0;*/
 460         pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
 461         pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
 462         pkt->icmp_id = myid;
 463
 464         /* If datalen < 4, we store timestamp _past_ the packet,
 465          * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
 466          */
 467         /*if (datalen >= 4)*/
 468                 /* No hton: we'll read it back on the same machine */
 469                 *(uint32_t*)&pkt->icmp_dun = monotonic_us();
 470
 471         pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
 472
 473         sendping_tail(sendping4, ICMP_MINLEN);
 474 }
 475 #if ENABLE_PING6
 476 static void sendping6(int junk UNUSED_PARAM)
 477 {
 478         struct icmp6_hdr *pkt = G.snd_packet;
 479
 480         //memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
 481         pkt->icmp6_type = ICMP6_ECHO_REQUEST;
 482         /*pkt->icmp6_code = 0;*/
 483         /*pkt->icmp6_cksum = 0;*/
 484         pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
 485         pkt->icmp6_id = myid;
 486
 487         /*if (datalen >= 4)*/
 488                 *(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
 489
 490         //TODO? pkt->icmp_cksum = inet_cksum(...);
 491
 492         sendping_tail(sendping6, sizeof(struct icmp6_hdr));
 493 }
 494 #endif
 495
 496 static const char *icmp_type_name(int id)
 497 {
 498         switch (id) {
 499         case ICMP_ECHOREPLY:      return "Echo Reply";
 500         case ICMP_DEST_UNREACH:   return "Destination Unreachable";
 501         case ICMP_SOURCE_QUENCH:  return "Source Quench";
 502         case ICMP_REDIRECT:       return "Redirect (change route)";
 503         case ICMP_ECHO:           return "Echo Request";
 504         case ICMP_TIME_EXCEEDED:  return "Time Exceeded";
 505         case ICMP_PARAMETERPROB:  return "Parameter Problem";
 506         case ICMP_TIMESTAMP:      return "Timestamp Request";
 507         case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
 508         case ICMP_INFO_REQUEST:   return "Information Request";
 509         case ICMP_INFO_REPLY:     return "Information Reply";
 510         case ICMP_ADDRESS:        return "Address Mask Request";
 511         case ICMP_ADDRESSREPLY:   return "Address Mask Reply";
 512         default:                  return "unknown ICMP type";
 513         }
 514 }
 515 #if ENABLE_PING6
 516 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
 517  * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
 518 #ifndef MLD_LISTENER_QUERY
 519 # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
 520 #endif
 521 #ifndef MLD_LISTENER_REPORT
 522 # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
 523 #endif
 524 #ifndef MLD_LISTENER_REDUCTION
 525 # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
 526 #endif
 527 static const char *icmp6_type_name(int id)
 528 {
 529         switch (id) {
 530         case ICMP6_DST_UNREACH:      return "Destination Unreachable";
 531         case ICMP6_PACKET_TOO_BIG:   return "Packet too big";
 532         case ICMP6_TIME_EXCEEDED:    return "Time Exceeded";
 533         case ICMP6_PARAM_PROB:       return "Parameter Problem";
 534         case ICMP6_ECHO_REPLY:       return "Echo Reply";
 535         case ICMP6_ECHO_REQUEST:     return "Echo Request";
 536         case MLD_LISTENER_QUERY:     return "Listener Query";
 537         case MLD_LISTENER_REPORT:    return "Listener Report";
 538         case MLD_LISTENER_REDUCTION: return "Listener Reduction";
 539         default:                     return "unknown ICMP type";
 540         }
 541 }
 542 #endif
 543
 544 static void unpack_tail(int sz, uint32_t *tp,
 545                 const char *from_str,
 546                 uint16_t recv_seq, int ttl)
 547 {
 548         const char *dupmsg = " (DUP!)";
 549         unsigned triptime = triptime; /* for gcc */
 550
 551         ++nreceived;
 552
 553         if (tp) {
 554                 /* (int32_t) cast is for hypothetical 64-bit unsigned */
 555                 /* (doesn't hurt 32-bit real-world anyway) */
 556                 triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
 557                 tsum += triptime;
 558                 if (triptime < tmin)
 559                         tmin = triptime;
 560                 if (triptime > tmax)
 561                         tmax = triptime;
 562         }
 563
 564         if (TST(recv_seq % MAX_DUP_CHK)) {
 565                 ++nrepeats;
 566                 --nreceived;
 567         } else {
 568                 SET(recv_seq % MAX_DUP_CHK);
 569                 dupmsg += 7;
 570         }
 571
 572         if (option_mask32 & OPT_QUIET)
 573                 return;
 574
 575         printf("%d bytes from %s: seq=%u ttl=%d", sz,
 576                 from_str, recv_seq, ttl);
 577         if (tp)
 578                 printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
 579         puts(dupmsg);
 580         fflush_all();
 581 }
 582 static void unpack4(char *buf, int sz, struct sockaddr_in *from)
 583 {
 584         struct icmp *icmppkt;
 585         struct iphdr *iphdr;
 586         int hlen;
 587
 588         /* discard if too short */
 589         if (sz < (datalen + ICMP_MINLEN))
 590                 return;
 591
 592         /* check IP header */
 593         iphdr = (struct iphdr *) buf;
 594         hlen = iphdr->ihl << 2;
 595         sz -= hlen;
 596         icmppkt = (struct icmp *) (buf + hlen);
 597         if (icmppkt->icmp_id != myid)
 598                 return;                         /* not our ping */
 599
 600         if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
 601                 uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
 602                 uint32_t *tp = NULL;
 603
 604                 if (sz >= ICMP_MINLEN + sizeof(uint32_t))
 605                         tp = (uint32_t *) icmppkt->icmp_data;
 606                 unpack_tail(sz, tp,
 607                         inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
 608                         recv_seq, iphdr->ttl);
 609         } else if (icmppkt->icmp_type != ICMP_ECHO) {
 610                 bb_error_msg("warning: got ICMP %d (%s)",
 611                                 icmppkt->icmp_type,
 612                                 icmp_type_name(icmppkt->icmp_type));
 613         }
 614 }
 615 #if ENABLE_PING6
 616 static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
 617 {
 618         struct icmp6_hdr *icmppkt;
 619         char buf[INET6_ADDRSTRLEN];
 620
 621         /* discard if too short */
 622         if (sz < (datalen + sizeof(struct icmp6_hdr)))
 623                 return;
 624
 625         icmppkt = (struct icmp6_hdr *) packet;
 626         if (icmppkt->icmp6_id != myid)
 627                 return;                         /* not our ping */
 628
 629         if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
 630                 uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
 631                 uint32_t *tp = NULL;
 632
 633                 if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
 634                         tp = (uint32_t *) &icmppkt->icmp6_data8[4];
 635                 unpack_tail(sz, tp,
 636                         inet_ntop(AF_INET6, &from->sin6_addr,
 637                                         buf, sizeof(buf)),
 638                         recv_seq, hoplimit);
 639         } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
 640                 bb_error_msg("warning: got ICMP %d (%s)",
 641                                 icmppkt->icmp6_type,
 642                                 icmp6_type_name(icmppkt->icmp6_type));
 643         }
 644 }
 645 #endif
 646
 647 static void ping4(len_and_sockaddr *lsa)
 648 {
 649         int sockopt;
 650
 651         pingsock = create_icmp_socket();
 652         pingaddr.sin = lsa->u.sin;
 653         if (source_lsa) {
 654                 if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
 655                                 &source_lsa->u.sa, source_lsa->len))
 656                         bb_error_msg_and_die("can't set multicast source interface");
 657                 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
 658         }
 659         if (str_I)
 660                 setsockopt_bindtodevice(pingsock, str_I);
 661
 662         /* enable broadcast pings */
 663         setsockopt_broadcast(pingsock);
 664
 665         /* set recv buf (needed if we can get lots of responses: flood ping,
 666          * broadcast ping etc) */
 667         sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
 668         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 669
 670         if (opt_ttl != 0) {
 671                 setsockopt(pingsock, IPPROTO_IP, IP_TTL, &opt_ttl, sizeof(opt_ttl));
 672                 /* above doesnt affect packets sent to bcast IP, so... */
 673                 setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
 674         }
 675
 676         signal(SIGINT, print_stats_and_exit);
 677
 678         /* start the ping's going ... */
 679         sendping4(0);
 680
 681         /* listen for replies */
 682         while (1) {
 683                 struct sockaddr_in from;
 684                 socklen_t fromlen = (socklen_t) sizeof(from);
 685                 int c;
 686
 687                 c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
 688                                 (struct sockaddr *) &from, &fromlen);
 689                 if (c < 0) {
 690                         if (errno != EINTR)
 691                                 bb_perror_msg("recvfrom");
 692                         continue;
 693                 }
 694                 unpack4(G.rcv_packet, c, &from);
 695                 if (pingcount && nreceived >= pingcount)
 696                         break;
 697         }
 698 }
 699 #if ENABLE_PING6
 700 extern int BUG_bad_offsetof_icmp6_cksum(void);
 701 static void ping6(len_and_sockaddr *lsa)
 702 {
 703         int sockopt;
 704         struct msghdr msg;
 705         struct sockaddr_in6 from;
 706         struct iovec iov;
 707         char control_buf[CMSG_SPACE(36)];
 708
 709         pingsock = create_icmp6_socket();
 710         pingaddr.sin6 = lsa->u.sin6;
 711         /* untested whether "-I addr" really works for IPv6: */
 712         if (source_lsa)
 713                 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
 714         if (str_I)
 715                 setsockopt_bindtodevice(pingsock, str_I);
 716
 717 #ifdef ICMP6_FILTER
 718         {
 719                 struct icmp6_filter filt;
 720                 if (!(option_mask32 & OPT_VERBOSE)) {
 721                         ICMP6_FILTER_SETBLOCKALL(&filt);
 722                         ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
 723                 } else {
 724                         ICMP6_FILTER_SETPASSALL(&filt);
 725                 }
 726                 if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 727                                         sizeof(filt)) < 0)
 728                         bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
 729         }
 730 #endif /*ICMP6_FILTER*/
 731
 732         /* enable broadcast pings */
 733         setsockopt_broadcast(pingsock);
 734
 735         /* set recv buf (needed if we can get lots of responses: flood ping,
 736          * broadcast ping etc) */
 737         sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
 738         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 739
 740         sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 741         if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
 742                 BUG_bad_offsetof_icmp6_cksum();
 743         setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
 744
 745         /* request ttl info to be returned in ancillary data */
 746         setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
 747
 748         if (if_index)
 749                 pingaddr.sin6.sin6_scope_id = if_index;
 750
 751         signal(SIGINT, print_stats_and_exit);
 752
 753         /* start the ping's going ... */
 754         sendping6(0);
 755
 756         /* listen for replies */
 757         msg.msg_name = &from;
 758         msg.msg_namelen = sizeof(from);
 759         msg.msg_iov = &iov;
 760         msg.msg_iovlen = 1;
 761         msg.msg_control = control_buf;
 762         iov.iov_base = G.rcv_packet;
 763         iov.iov_len = G.sizeof_rcv_packet;
 764         while (1) {
 765                 int c;
 766                 struct cmsghdr *mp;
 767                 int hoplimit = -1;
 768                 msg.msg_controllen = sizeof(control_buf);
 769
 770                 c = recvmsg(pingsock, &msg, 0);
 771                 if (c < 0) {
 772                         if (errno != EINTR)
 773                                 bb_perror_msg("recvfrom");
 774                         continue;
 775                 }
 776                 for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
 777                         if (mp->cmsg_level == SOL_IPV6
 778                          && mp->cmsg_type == IPV6_HOPLIMIT
 779                          /* don't check len - we trust the kernel: */
 780                          /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
 781                         ) {
 782                                 /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
 783                                 move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
 784                         }
 785                 }
 786                 unpack6(G.rcv_packet, c, &from, hoplimit);
 787                 if (pingcount && nreceived >= pingcount)
 788                         break;
 789         }
 790 }
 791 #endif
 792
 793 static void ping(len_and_sockaddr *lsa)
 794 {
 795         printf("PING %s (%s)", hostname, dotted);
 796         if (source_lsa) {
 797                 printf(" from %s",
 798                         xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
 799         }
 800         printf(": %d data bytes\n", datalen);
 801
 802         G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
 803         G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
 804 #if ENABLE_PING6
 805         if (lsa->u.sa.sa_family == AF_INET6) {
 806                 /* +4 reserves a place for timestamp, which may end up sitting
 807                  * _after_ packet. Saves one if() - see sendping4/6() */
 808                 G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
 809                 ping6(lsa);
 810         } else
 811 #endif
 812         {
 813                 G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
 814                 ping4(lsa);
 815         }
 816 }
 817
 818 static int common_ping_main(int opt, char **argv)
 819 {
 820         len_and_sockaddr *lsa;
 821         char *str_s;
 822
 823         INIT_G();
 824
 825         /* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
 826         opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
 827         opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I);
 828         if (opt & OPT_s)
 829                 datalen = xatou16(str_s); // -s
 830         if (opt & OPT_I) { // -I
 831                 if_index = if_nametoindex(str_I);
 832                 if (!if_index) {
 833                         /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
 834                         source_lsa = xdotted2sockaddr(str_I, 0);
 835                         str_I = NULL; /* don't try to bind to device later */
 836                 }
 837         }
 838         myid = (uint16_t) getpid();
 839         hostname = argv[optind];
 840 #if ENABLE_PING6
 841         {
 842                 sa_family_t af = AF_UNSPEC;
 843                 if (opt & OPT_IPV4)
 844                         af = AF_INET;
 845                 if (opt & OPT_IPV6)
 846                         af = AF_INET6;
 847                 lsa = xhost_and_af2sockaddr(hostname, 0, af);
 848         }
 849 #else
 850         lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
 851 #endif
 852
 853         if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
 854                 /* leaking it here... */
 855                 source_lsa = NULL;
 856
 857         dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
 858         ping(lsa);
 859         print_stats_and_exit(EXIT_SUCCESS);
 860         /*return EXIT_SUCCESS;*/
 861 }
 862 #endif /* FEATURE_FANCY_PING */
 863
 864
 865 int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 866 int ping_main(int argc UNUSED_PARAM, char **argv)
 867 {
 868 #if !ENABLE_FEATURE_FANCY_PING
 869         return common_ping_main(AF_UNSPEC, argv);
 870 #else
 871         return common_ping_main(0, argv);
 872 #endif
 873 }
 874
 875 #if ENABLE_PING6
 876 int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 877 int ping6_main(int argc UNUSED_PARAM, char **argv)
 878 {
 879 # if !ENABLE_FEATURE_FANCY_PING
 880         return common_ping_main(AF_INET6, argv);
 881 # else
 882         return common_ping_main(OPT_IPV6, argv);
 883 # endif
 884 }
 885 #endif
 886
 887 /* from ping6.c:
 888  * Copyright (c) 1989 The Regents of the University of California.
 889  * All rights reserved.
 890  *
 891  * This code is derived from software contributed to Berkeley by
 892  * Mike Muuss.
 893  *
 894  * Redistribution and use in source and binary forms, with or without
 895  * modification, are permitted provided that the following conditions
 896  * are met:
 897  * 1. Redistributions of source code must retain the above copyright
 898  *    notice, this list of conditions and the following disclaimer.
 899  * 2. Redistributions in binary form must reproduce the above copyright
 900  *    notice, this list of conditions and the following disclaimer in the
 901  *    documentation and/or other materials provided with the distribution.
 902  *
 903  * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
 904  *              ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
 905  *
 906  * 4. Neither the name of the University nor the names of its contributors
 907  *    may be used to endorse or promote products derived from this software
 908  *    without specific prior written permission.
 909  *
 910  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 911  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 912  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 913  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 914  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 915  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 916  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 917  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 918  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 919  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 920  * SUCH DAMAGE.
 921  */