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:        IF_PING6(
  93 //usage:     "\n        -4,-6           Force IP or IPv6 name resolution"
  94 //usage:        )
  95 //usage:     "\n        -c CNT          Send only CNT pings"
  96 //usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
  97 //usage:     "\n        -t TTL          Set TTL"
  98 //usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
  99 //usage:     "\n        -W SEC          Seconds to wait for the first response (default:10)"
 100 //usage:     "\n                        (after all -c CNT packets are sent)"
 101 //usage:     "\n        -w SEC          Seconds until ping exits (default:infinite)"
 102 //usage:     "\n                        (can exit earlier with -c CNT)"
 103 //usage:     "\n        -q              Quiet, only display output at start"
 104 //usage:     "\n                        and when finished"
 105 //usage:     "\n        -p              Pattern to use for payload"
 106 //usage:
 107 //usage:# define ping6_trivial_usage
 108 //usage:       "[OPTIONS] HOST"
 109 //usage:# define ping6_full_usage "\n\n"
 110 //usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
 111 //usage:     "\n        -c CNT          Send only CNT pings"
 112 //usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
 113 //usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
 114 //usage:     "\n        -q              Quiet, only display output at start"
 115 //usage:     "\n                        and when finished"
 116 //usage:     "\n        -p              Pattern to use for payload"
 117 //usage:
 118 //usage:#endif
 119 //usage:
 120 //usage:#define ping_example_usage
 121 //usage:       "$ ping localhost\n"
 122 //usage:       "PING slag (127.0.0.1): 56 data bytes\n"
 123 //usage:       "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
 124 //usage:       "\n"
 125 //usage:       "--- debian ping statistics ---\n"
 126 //usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
 127 //usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
 128 //usage:#define ping6_example_usage
 129 //usage:       "$ ping6 ip6-localhost\n"
 130 //usage:       "PING ip6-localhost (::1): 56 data bytes\n"
 131 //usage:       "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
 132 //usage:       "\n"
 133 //usage:       "--- ip6-localhost ping statistics ---\n"
 134 //usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
 135 //usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
 136
 137 #if ENABLE_PING6
 138 # include <netinet/icmp6.h>
 139 /* I see RENUMBERED constants in bits/in.h - !!?
 140  * What a fuck is going on with libc? Is it a glibc joke? */
 141 # ifdef IPV6_2292HOPLIMIT
 142 #  undef IPV6_HOPLIMIT
 143 #  define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
 144 # endif
 145 #endif
 146
 147 enum {
 148         DEFDATALEN = 56,
 149         MAXIPLEN = 60,
 150         MAXICMPLEN = 76,
 151         MAX_DUP_CHK = (8 * 128),
 152         MAXWAIT = 10,
 153         PINGINTERVAL = 1, /* 1 second */
 154         pingsock = 0,
 155 };
 156
 157 static void
 158 #if ENABLE_PING6
 159 create_icmp_socket(len_and_sockaddr *lsa)
 160 #else
 161 create_icmp_socket(void)
 162 #define create_icmp_socket(lsa) create_icmp_socket()
 163 #endif
 164 {
 165         int sock;
 166 #if ENABLE_PING6
 167         if (lsa->u.sa.sa_family == AF_INET6)
 168                 sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
 169         else
 170 #endif
 171                 sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
 172         if (sock < 0) {
 173                 if (errno == EPERM)
 174                         bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
 175                 bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
 176         }
 177
 178         xmove_fd(sock, pingsock);
 179 }
 180
 181 #if !ENABLE_FEATURE_FANCY_PING
 182
 183 /* Simple version */
 184
 185 struct globals {
 186         char *hostname;
 187         char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
 188 } FIX_ALIASING;
 189 #define G (*(struct globals*)&bb_common_bufsiz1)
 190 #define INIT_G() do { } while (0)
 191
 192 static void noresp(int ign UNUSED_PARAM)
 193 {
 194         printf("No response from %s\n", G.hostname);
 195         exit(EXIT_FAILURE);
 196 }
 197
 198 static void ping4(len_and_sockaddr *lsa)
 199 {
 200         struct icmp *pkt;
 201         int c;
 202
 203         pkt = (struct icmp *) G.packet;
 204         /*memset(pkt, 0, sizeof(G.packet)); already is */
 205         pkt->icmp_type = ICMP_ECHO;
 206         pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));
 207
 208         xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
 209
 210         /* listen for replies */
 211         while (1) {
 212 #if 0
 213                 struct sockaddr_in from;
 214                 socklen_t fromlen = sizeof(from);
 215
 216                 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
 217                                 (struct sockaddr *) &from, &fromlen);
 218 #else
 219                 c = recv(pingsock, G.packet, sizeof(G.packet), 0);
 220 #endif
 221                 if (c < 0) {
 222                         if (errno != EINTR)
 223                                 bb_perror_msg("recvfrom");
 224                         continue;
 225                 }
 226                 if (c >= 76) {                  /* ip + icmp */
 227                         struct iphdr *iphdr = (struct iphdr *) G.packet;
 228
 229                         pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));   /* skip ip hdr */
 230                         if (pkt->icmp_type == ICMP_ECHOREPLY)
 231                                 break;
 232                 }
 233         }
 234         if (ENABLE_FEATURE_CLEAN_UP)
 235                 close(pingsock);
 236 }
 237
 238 #if ENABLE_PING6
 239 static void ping6(len_and_sockaddr *lsa)
 240 {
 241         struct icmp6_hdr *pkt;
 242         int c;
 243         int sockopt;
 244
 245         pkt = (struct icmp6_hdr *) G.packet;
 246         /*memset(pkt, 0, sizeof(G.packet)); already is */
 247         pkt->icmp6_type = ICMP6_ECHO_REQUEST;
 248
 249         sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 250         setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
 251
 252         xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
 253
 254         /* listen for replies */
 255         while (1) {
 256 #if 0
 257                 struct sockaddr_in6 from;
 258                 socklen_t fromlen = sizeof(from);
 259
 260                 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
 261                                 (struct sockaddr *) &from, &fromlen);
 262 #else
 263                 c = recv(pingsock, G.packet, sizeof(G.packet), 0);
 264 #endif
 265                 if (c < 0) {
 266                         if (errno != EINTR)
 267                                 bb_perror_msg("recvfrom");
 268                         continue;
 269                 }
 270                 if (c >= ICMP_MINLEN) { /* icmp6_hdr */
 271                         if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
 272                                 break;
 273                 }
 274         }
 275         if (ENABLE_FEATURE_CLEAN_UP)
 276                 close(pingsock);
 277 }
 278 #endif
 279
 280 #if !ENABLE_PING6
 281 # define common_ping_main(af, argv) common_ping_main(argv)
 282 #endif
 283 static int common_ping_main(sa_family_t af, char **argv)
 284 {
 285         len_and_sockaddr *lsa;
 286
 287         INIT_G();
 288
 289 #if ENABLE_PING6
 290         while ((++argv)[0] && argv[0][0] == '-') {
 291                 if (argv[0][1] == '4') {
 292                         af = AF_INET;
 293                         continue;
 294                 }
 295                 if (argv[0][1] == '6') {
 296                         af = AF_INET6;
 297                         continue;
 298                 }
 299                 bb_show_usage();
 300         }
 301 #else
 302         argv++;
 303 #endif
 304
 305         G.hostname = *argv;
 306         if (!G.hostname)
 307                 bb_show_usage();
 308
 309 #if ENABLE_PING6
 310         lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
 311 #else
 312         lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
 313 #endif
 314         /* Set timer _after_ DNS resolution */
 315         signal(SIGALRM, noresp);
 316         alarm(5); /* give the host 5000ms to respond */
 317
 318         create_icmp_socket(lsa);
 319 #if ENABLE_PING6
 320         if (lsa->u.sa.sa_family == AF_INET6)
 321                 ping6(lsa);
 322         else
 323 #endif
 324                 ping4(lsa);
 325         printf("%s is alive!\n", G.hostname);
 326         return EXIT_SUCCESS;
 327 }
 328
 329
 330 #else /* FEATURE_FANCY_PING */
 331
 332
 333 /* Full(er) version */
 334
 335 #define OPT_STRING ("qvc:s:t:w:W:I:np:4" IF_PING6("6"))
 336 enum {
 337         OPT_QUIET = 1 << 0,
 338         OPT_VERBOSE = 1 << 1,
 339         OPT_c = 1 << 2,
 340         OPT_s = 1 << 3,
 341         OPT_t = 1 << 4,
 342         OPT_w = 1 << 5,
 343         OPT_W = 1 << 6,
 344         OPT_I = 1 << 7,
 345         /*OPT_n = 1 << 8, - ignored */
 346         OPT_p = 1 << 9,
 347         OPT_IPV4 = 1 << 10,
 348         OPT_IPV6 = (1 << 11) * ENABLE_PING6,
 349 };
 350
 351
 352 struct globals {
 353         int if_index;
 354         char *str_I;
 355         len_and_sockaddr *source_lsa;
 356         unsigned datalen;
 357         unsigned pingcount; /* must be int-sized */
 358         unsigned opt_ttl;
 359         unsigned long ntransmitted, nreceived, nrepeats;
 360         uint16_t myid;
 361         uint8_t pattern;
 362         unsigned tmin, tmax; /* in us */
 363         unsigned long long tsum; /* in us, sum of all times */
 364         unsigned deadline;
 365         unsigned timeout;
 366         unsigned total_secs;
 367         unsigned sizeof_rcv_packet;
 368         char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
 369         void *snd_packet; /* [datalen + ipv4/ipv6_const] */
 370         const char *hostname;
 371         const char *dotted;
 372         union {
 373                 struct sockaddr sa;
 374                 struct sockaddr_in sin;
 375 #if ENABLE_PING6
 376                 struct sockaddr_in6 sin6;
 377 #endif
 378         } pingaddr;
 379         unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
 380 } FIX_ALIASING;
 381 #define G (*(struct globals*)&bb_common_bufsiz1)
 382 #define if_index     (G.if_index    )
 383 #define source_lsa   (G.source_lsa  )
 384 #define str_I        (G.str_I       )
 385 #define datalen      (G.datalen     )
 386 #define pingcount    (G.pingcount   )
 387 #define opt_ttl      (G.opt_ttl     )
 388 #define myid         (G.myid        )
 389 #define tmin         (G.tmin        )
 390 #define tmax         (G.tmax        )
 391 #define tsum         (G.tsum        )
 392 #define deadline     (G.deadline    )
 393 #define timeout      (G.timeout     )
 394 #define total_secs   (G.total_secs  )
 395 #define hostname     (G.hostname    )
 396 #define dotted       (G.dotted      )
 397 #define pingaddr     (G.pingaddr    )
 398 #define rcvd_tbl     (G.rcvd_tbl    )
 399 void BUG_ping_globals_too_big(void);
 400 #define INIT_G() do { \
 401         if (sizeof(G) > COMMON_BUFSIZE) \
 402                 BUG_ping_globals_too_big(); \
 403         datalen = DEFDATALEN; \
 404         timeout = MAXWAIT; \
 405         tmin = UINT_MAX; \
 406 } while (0)
 407
 408
 409 #define BYTE(bit)       rcvd_tbl[(bit)>>3]
 410 #define MASK(bit)       (1 << ((bit) & 7))
 411 #define SET(bit)        (BYTE(bit) |= MASK(bit))
 412 #define CLR(bit)        (BYTE(bit) &= (~MASK(bit)))
 413 #define TST(bit)        (BYTE(bit) & MASK(bit))
 414
 415 static void print_stats_and_exit(int junk) NORETURN;
 416 static void print_stats_and_exit(int junk UNUSED_PARAM)
 417 {
 418         unsigned long ul;
 419         unsigned long nrecv;
 420
 421         signal(SIGINT, SIG_IGN);
 422
 423         nrecv = G.nreceived;
 424         printf("\n--- %s ping statistics ---\n"
 425                 "%lu packets transmitted, "
 426                 "%lu packets received, ",
 427                 hostname, G.ntransmitted, nrecv
 428         );
 429         if (G.nrepeats)
 430                 printf("%lu duplicates, ", G.nrepeats);
 431         ul = G.ntransmitted;
 432         if (ul != 0)
 433                 ul = (ul - nrecv) * 100 / ul;
 434         printf("%lu%% packet loss\n", ul);
 435         if (tmin != UINT_MAX) {
 436                 unsigned tavg = tsum / (nrecv + G.nrepeats);
 437                 printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
 438                         tmin / 1000, tmin % 1000,
 439                         tavg / 1000, tavg % 1000,
 440                         tmax / 1000, tmax % 1000);
 441         }
 442         /* if condition is true, exit with 1 -- 'failure' */
 443         exit(nrecv == 0 || (deadline && nrecv < pingcount));
 444 }
 445
 446 static void sendping_tail(void (*sp)(int), int size_pkt)
 447 {
 448         int sz;
 449
 450         CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK);
 451         G.ntransmitted++;
 452
 453         size_pkt += datalen;
 454
 455         /* sizeof(pingaddr) can be larger than real sa size, but I think
 456          * it doesn't matter */
 457         sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
 458         if (sz != size_pkt)
 459                 bb_error_msg_and_die(bb_msg_write_error);
 460
 461         if (pingcount == 0 || deadline || G.ntransmitted < pingcount) {
 462                 /* Didn't send all pings yet - schedule next in 1s */
 463                 signal(SIGALRM, sp);
 464                 if (deadline) {
 465                         total_secs += PINGINTERVAL;
 466                         if (total_secs >= deadline)
 467                                 signal(SIGALRM, print_stats_and_exit);
 468                 }
 469                 alarm(PINGINTERVAL);
 470         } else { /* -c NN, and all NN are sent (and no deadline) */
 471                 /* Wait for the last ping to come back.
 472                  * -W timeout: wait for a response in seconds.
 473                  * Affects only timeout in absense of any responses,
 474                  * otherwise ping waits for two RTTs. */
 475                 unsigned expire = timeout;
 476
 477                 if (G.nreceived) {
 478                         /* approx. 2*tmax, in seconds (2 RTT) */
 479                         expire = tmax / (512*1024);
 480                         if (expire == 0)
 481                                 expire = 1;
 482                 }
 483                 signal(SIGALRM, print_stats_and_exit);
 484                 alarm(expire);
 485         }
 486 }
 487
 488 static void sendping4(int junk UNUSED_PARAM)
 489 {
 490         struct icmp *pkt = G.snd_packet;
 491
 492         memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4);
 493         pkt->icmp_type = ICMP_ECHO;
 494         /*pkt->icmp_code = 0;*/
 495         pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
 496         pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
 497         pkt->icmp_id = myid;
 498
 499         /* If datalen < 4, we store timestamp _past_ the packet,
 500          * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
 501          */
 502         /*if (datalen >= 4)*/
 503                 /* No hton: we'll read it back on the same machine */
 504                 *(uint32_t*)&pkt->icmp_dun = monotonic_us();
 505
 506         pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
 507
 508         sendping_tail(sendping4, ICMP_MINLEN);
 509 }
 510 #if ENABLE_PING6
 511 static void sendping6(int junk UNUSED_PARAM)
 512 {
 513         struct icmp6_hdr *pkt = G.snd_packet;
 514
 515         memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4);
 516         pkt->icmp6_type = ICMP6_ECHO_REQUEST;
 517         /*pkt->icmp6_code = 0;*/
 518         /*pkt->icmp6_cksum = 0;*/
 519         pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
 520         pkt->icmp6_id = myid;
 521
 522         /*if (datalen >= 4)*/
 523                 *(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
 524
 525         //TODO? pkt->icmp_cksum = inet_cksum(...);
 526
 527         sendping_tail(sendping6, sizeof(struct icmp6_hdr));
 528 }
 529 #endif
 530
 531 static const char *icmp_type_name(int id)
 532 {
 533         switch (id) {
 534         case ICMP_ECHOREPLY:      return "Echo Reply";
 535         case ICMP_DEST_UNREACH:   return "Destination Unreachable";
 536         case ICMP_SOURCE_QUENCH:  return "Source Quench";
 537         case ICMP_REDIRECT:       return "Redirect (change route)";
 538         case ICMP_ECHO:           return "Echo Request";
 539         case ICMP_TIME_EXCEEDED:  return "Time Exceeded";
 540         case ICMP_PARAMETERPROB:  return "Parameter Problem";
 541         case ICMP_TIMESTAMP:      return "Timestamp Request";
 542         case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
 543         case ICMP_INFO_REQUEST:   return "Information Request";
 544         case ICMP_INFO_REPLY:     return "Information Reply";
 545         case ICMP_ADDRESS:        return "Address Mask Request";
 546         case ICMP_ADDRESSREPLY:   return "Address Mask Reply";
 547         default:                  return "unknown ICMP type";
 548         }
 549 }
 550 #if ENABLE_PING6
 551 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
 552  * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
 553 #ifndef MLD_LISTENER_QUERY
 554 # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
 555 #endif
 556 #ifndef MLD_LISTENER_REPORT
 557 # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
 558 #endif
 559 #ifndef MLD_LISTENER_REDUCTION
 560 # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
 561 #endif
 562 static const char *icmp6_type_name(int id)
 563 {
 564         switch (id) {
 565         case ICMP6_DST_UNREACH:      return "Destination Unreachable";
 566         case ICMP6_PACKET_TOO_BIG:   return "Packet too big";
 567         case ICMP6_TIME_EXCEEDED:    return "Time Exceeded";
 568         case ICMP6_PARAM_PROB:       return "Parameter Problem";
 569         case ICMP6_ECHO_REPLY:       return "Echo Reply";
 570         case ICMP6_ECHO_REQUEST:     return "Echo Request";
 571         case MLD_LISTENER_QUERY:     return "Listener Query";
 572         case MLD_LISTENER_REPORT:    return "Listener Report";
 573         case MLD_LISTENER_REDUCTION: return "Listener Reduction";
 574         default:                     return "unknown ICMP type";
 575         }
 576 }
 577 #endif
 578
 579 static void unpack_tail(int sz, uint32_t *tp,
 580                 const char *from_str,
 581                 uint16_t recv_seq, int ttl)
 582 {
 583         unsigned char *b, m;
 584         const char *dupmsg = " (DUP!)";
 585         unsigned triptime = triptime; /* for gcc */
 586
 587         if (tp) {
 588                 /* (int32_t) cast is for hypothetical 64-bit unsigned */
 589                 /* (doesn't hurt 32-bit real-world anyway) */
 590                 triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
 591                 tsum += triptime;
 592                 if (triptime < tmin)
 593                         tmin = triptime;
 594                 if (triptime > tmax)
 595                         tmax = triptime;
 596         }
 597
 598         b = &BYTE(recv_seq % MAX_DUP_CHK);
 599         m = MASK(recv_seq % MAX_DUP_CHK);
 600         /*if TST(recv_seq % MAX_DUP_CHK):*/
 601         if (*b & m) {
 602                 ++G.nrepeats;
 603         } else {
 604                 /*SET(recv_seq % MAX_DUP_CHK):*/
 605                 *b |= m;
 606                 ++G.nreceived;
 607                 dupmsg += 7;
 608         }
 609
 610         if (option_mask32 & OPT_QUIET)
 611                 return;
 612
 613         printf("%d bytes from %s: seq=%u ttl=%d", sz,
 614                 from_str, recv_seq, ttl);
 615         if (tp)
 616                 printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
 617         puts(dupmsg);
 618         fflush_all();
 619 }
 620 static void unpack4(char *buf, int sz, struct sockaddr_in *from)
 621 {
 622         struct icmp *icmppkt;
 623         struct iphdr *iphdr;
 624         int hlen;
 625
 626         /* discard if too short */
 627         if (sz < (datalen + ICMP_MINLEN))
 628                 return;
 629
 630         /* check IP header */
 631         iphdr = (struct iphdr *) buf;
 632         hlen = iphdr->ihl << 2;
 633         sz -= hlen;
 634         icmppkt = (struct icmp *) (buf + hlen);
 635         if (icmppkt->icmp_id != myid)
 636                 return;                         /* not our ping */
 637
 638         if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
 639                 uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
 640                 uint32_t *tp = NULL;
 641
 642                 if (sz >= ICMP_MINLEN + sizeof(uint32_t))
 643                         tp = (uint32_t *) icmppkt->icmp_data;
 644                 unpack_tail(sz, tp,
 645                         inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
 646                         recv_seq, iphdr->ttl);
 647         } else if (icmppkt->icmp_type != ICMP_ECHO) {
 648                 bb_error_msg("warning: got ICMP %d (%s)",
 649                                 icmppkt->icmp_type,
 650                                 icmp_type_name(icmppkt->icmp_type));
 651         }
 652 }
 653 #if ENABLE_PING6
 654 static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
 655 {
 656         struct icmp6_hdr *icmppkt;
 657         char buf[INET6_ADDRSTRLEN];
 658
 659         /* discard if too short */
 660         if (sz < (datalen + sizeof(struct icmp6_hdr)))
 661                 return;
 662
 663         icmppkt = (struct icmp6_hdr *) packet;
 664         if (icmppkt->icmp6_id != myid)
 665                 return;                         /* not our ping */
 666
 667         if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
 668                 uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
 669                 uint32_t *tp = NULL;
 670
 671                 if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
 672                         tp = (uint32_t *) &icmppkt->icmp6_data8[4];
 673                 unpack_tail(sz, tp,
 674                         inet_ntop(AF_INET6, &from->sin6_addr,
 675                                         buf, sizeof(buf)),
 676                         recv_seq, hoplimit);
 677         } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
 678                 bb_error_msg("warning: got ICMP %d (%s)",
 679                                 icmppkt->icmp6_type,
 680                                 icmp6_type_name(icmppkt->icmp6_type));
 681         }
 682 }
 683 #endif
 684
 685 static void ping4(len_and_sockaddr *lsa)
 686 {
 687         int sockopt;
 688
 689         pingaddr.sin = lsa->u.sin;
 690         if (source_lsa) {
 691                 if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
 692                                 &source_lsa->u.sa, source_lsa->len))
 693                         bb_error_msg_and_die("can't set multicast source interface");
 694                 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
 695         }
 696
 697         /* enable broadcast pings */
 698         setsockopt_broadcast(pingsock);
 699
 700         /* set recv buf (needed if we can get lots of responses: flood ping,
 701          * broadcast ping etc) */
 702         sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
 703         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 704
 705         if (opt_ttl != 0) {
 706                 setsockopt(pingsock, IPPROTO_IP, IP_TTL, &opt_ttl, sizeof(opt_ttl));
 707                 /* above doesnt affect packets sent to bcast IP, so... */
 708                 setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
 709         }
 710
 711         signal(SIGINT, print_stats_and_exit);
 712
 713         /* start the ping's going ... */
 714         sendping4(0);
 715
 716         /* listen for replies */
 717         while (1) {
 718                 struct sockaddr_in from;
 719                 socklen_t fromlen = (socklen_t) sizeof(from);
 720                 int c;
 721
 722                 c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
 723                                 (struct sockaddr *) &from, &fromlen);
 724                 if (c < 0) {
 725                         if (errno != EINTR)
 726                                 bb_perror_msg("recvfrom");
 727                         continue;
 728                 }
 729                 unpack4(G.rcv_packet, c, &from);
 730                 if (pingcount && G.nreceived >= pingcount)
 731                         break;
 732         }
 733 }
 734 #if ENABLE_PING6
 735 extern int BUG_bad_offsetof_icmp6_cksum(void);
 736 static void ping6(len_and_sockaddr *lsa)
 737 {
 738         int sockopt;
 739         struct msghdr msg;
 740         struct sockaddr_in6 from;
 741         struct iovec iov;
 742         char control_buf[CMSG_SPACE(36)];
 743
 744         pingaddr.sin6 = lsa->u.sin6;
 745         if (source_lsa)
 746                 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
 747
 748 #ifdef ICMP6_FILTER
 749         {
 750                 struct icmp6_filter filt;
 751                 if (!(option_mask32 & OPT_VERBOSE)) {
 752                         ICMP6_FILTER_SETBLOCKALL(&filt);
 753                         ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
 754                 } else {
 755                         ICMP6_FILTER_SETPASSALL(&filt);
 756                 }
 757                 if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 758                                         sizeof(filt)) < 0)
 759                         bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
 760         }
 761 #endif /*ICMP6_FILTER*/
 762
 763         /* enable broadcast pings */
 764         setsockopt_broadcast(pingsock);
 765
 766         /* set recv buf (needed if we can get lots of responses: flood ping,
 767          * broadcast ping etc) */
 768         sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
 769         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 770
 771         sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 772         if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
 773                 BUG_bad_offsetof_icmp6_cksum();
 774         setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
 775
 776         /* request ttl info to be returned in ancillary data */
 777         setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
 778
 779         if (if_index)
 780                 pingaddr.sin6.sin6_scope_id = if_index;
 781
 782         signal(SIGINT, print_stats_and_exit);
 783
 784         /* start the ping's going ... */
 785         sendping6(0);
 786
 787         /* listen for replies */
 788         msg.msg_name = &from;
 789         msg.msg_namelen = sizeof(from);
 790         msg.msg_iov = &iov;
 791         msg.msg_iovlen = 1;
 792         msg.msg_control = control_buf;
 793         iov.iov_base = G.rcv_packet;
 794         iov.iov_len = G.sizeof_rcv_packet;
 795         while (1) {
 796                 int c;
 797                 struct cmsghdr *mp;
 798                 int hoplimit = -1;
 799                 msg.msg_controllen = sizeof(control_buf);
 800
 801                 c = recvmsg(pingsock, &msg, 0);
 802                 if (c < 0) {
 803                         if (errno != EINTR)
 804                                 bb_perror_msg("recvfrom");
 805                         continue;
 806                 }
 807                 for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
 808                         if (mp->cmsg_level == SOL_IPV6
 809                          && mp->cmsg_type == IPV6_HOPLIMIT
 810                          /* don't check len - we trust the kernel: */
 811                          /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
 812                         ) {
 813                                 /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
 814                                 move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
 815                         }
 816                 }
 817                 unpack6(G.rcv_packet, c, &from, hoplimit);
 818                 if (pingcount && G.nreceived >= pingcount)
 819                         break;
 820         }
 821 }
 822 #endif
 823
 824 static void ping(len_and_sockaddr *lsa)
 825 {
 826         printf("PING %s (%s)", hostname, dotted);
 827         if (source_lsa) {
 828                 printf(" from %s",
 829                         xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
 830         }
 831         printf(": %d data bytes\n", datalen);
 832
 833         create_icmp_socket(lsa);
 834         /* untested whether "-I addr" really works for IPv6: */
 835         if (str_I)
 836                 setsockopt_bindtodevice(pingsock, str_I);
 837
 838         G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
 839         G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
 840 #if ENABLE_PING6
 841         if (lsa->u.sa.sa_family == AF_INET6) {
 842                 /* +4 reserves a place for timestamp, which may end up sitting
 843                  * _after_ packet. Saves one if() - see sendping4/6() */
 844                 G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
 845                 ping6(lsa);
 846         } else
 847 #endif
 848         {
 849                 G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
 850                 ping4(lsa);
 851         }
 852 }
 853
 854 static int common_ping_main(int opt, char **argv)
 855 {
 856         len_and_sockaddr *lsa;
 857         char *str_s, *str_p;
 858
 859         INIT_G();
 860
 861         /* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
 862         opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
 863         opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I, &str_p);
 864         if (opt & OPT_s)
 865                 datalen = xatou16(str_s); // -s
 866         if (opt & OPT_I) { // -I
 867                 if_index = if_nametoindex(str_I);
 868                 if (!if_index) {
 869                         /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
 870                         source_lsa = xdotted2sockaddr(str_I, 0);
 871                         str_I = NULL; /* don't try to bind to device later */
 872                 }
 873         }
 874         if (opt & OPT_p)
 875                 G.pattern = xstrtou_range(str_p, 16, 0, 255);
 876
 877         myid = (uint16_t) getpid();
 878         hostname = argv[optind];
 879 #if ENABLE_PING6
 880         {
 881                 sa_family_t af = AF_UNSPEC;
 882                 if (opt & OPT_IPV4)
 883                         af = AF_INET;
 884                 if (opt & OPT_IPV6)
 885                         af = AF_INET6;
 886                 lsa = xhost_and_af2sockaddr(hostname, 0, af);
 887         }
 888 #else
 889         lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
 890 #endif
 891
 892         if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
 893                 /* leaking it here... */
 894                 source_lsa = NULL;
 895
 896         dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
 897         ping(lsa);
 898         print_stats_and_exit(EXIT_SUCCESS);
 899         /*return EXIT_SUCCESS;*/
 900 }
 901 #endif /* FEATURE_FANCY_PING */
 902
 903
 904 int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 905 int ping_main(int argc UNUSED_PARAM, char **argv)
 906 {
 907 #if !ENABLE_FEATURE_FANCY_PING
 908         return common_ping_main(AF_UNSPEC, argv);
 909 #else
 910         return common_ping_main(0, argv);
 911 #endif
 912 }
 913
 914 #if ENABLE_PING6
 915 int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 916 int ping6_main(int argc UNUSED_PARAM, char **argv)
 917 {
 918 # if !ENABLE_FEATURE_FANCY_PING
 919         return common_ping_main(AF_INET6, argv);
 920 # else
 921         return common_ping_main(OPT_IPV6, argv);
 922 # endif
 923 }
 924 #endif
 925
 926 /* from ping6.c:
 927  * Copyright (c) 1989 The Regents of the University of California.
 928  * All rights reserved.
 929  *
 930  * This code is derived from software contributed to Berkeley by
 931  * Mike Muuss.
 932  *
 933  * Redistribution and use in source and binary forms, with or without
 934  * modification, are permitted provided that the following conditions
 935  * are met:
 936  * 1. Redistributions of source code must retain the above copyright
 937  *    notice, this list of conditions and the following disclaimer.
 938  * 2. Redistributions in binary form must reproduce the above copyright
 939  *    notice, this list of conditions and the following disclaimer in the
 940  *    documentation and/or other materials provided with the distribution.
 941  *
 942  * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
 943  *              ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
 944  *
 945  * 4. Neither the name of the University nor the names of its contributors
 946  *    may be used to endorse or promote products derived from this software
 947  *    without specific prior written permission.
 948  *
 949  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 950  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 951  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 952  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 953  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 954  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 955  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 956  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 957  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 958  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 959  * SUCH DAMAGE.
 960  */