/* vi: set sw=4 ts=4: */ /* * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung * * Adapted from the ping in netkit-base 0.10: * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Muuss. * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ /* from ping6.c: * Copyright (C) 1999 by Randolph Chung * * This version of ping is adapted from the ping in netkit-base 0.10, * which is: * * Original copyright notice is retained at the end of this file. * * This version is an adaptation of ping.c from busybox. * The code was modified by Bart Visscher */ //config:config PING //config: bool "ping (10 kb)" //config: default y //config: help //config: ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to //config: elicit an ICMP ECHO_RESPONSE from a host or gateway. //config: //config:config PING6 //config: bool "ping6 (11 kb)" //config: default y //config: depends on FEATURE_IPV6 //config: help //config: Alias to "ping -6". //config: //config:config FEATURE_FANCY_PING //config: bool "Enable fancy ping output" //config: default y //config: depends on PING || PING6 //config: help //config: With this option off, ping will say "HOST is alive!" //config: or terminate with SIGALRM in 5 seconds otherwise. //config: No command-line options will be recognized. /* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */ //applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE)) //applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE)) //kbuild:lib-$(CONFIG_PING) += ping.o //kbuild:lib-$(CONFIG_PING6) += ping.o //usage:#if !ENABLE_FEATURE_FANCY_PING //usage:# define ping_trivial_usage //usage: "HOST" //usage:# define ping_full_usage "\n\n" //usage: "Send ICMP ECHO_REQUESTs to HOST" //usage:# define ping6_trivial_usage //usage: "HOST" //usage:# define ping6_full_usage "\n\n" //usage: "Send ICMP ECHO_REQUESTs to HOST" //usage:#else //usage:# define ping_trivial_usage //usage: "[OPTIONS] HOST" //usage:# define ping_full_usage "\n\n" //usage: "Send ICMP ECHO_REQUESTs to HOST\n" //usage: IF_PING6( //usage: "\n -4,-6 Force IP or IPv6 name resolution" //usage: ) //usage: "\n -c CNT Send only CNT pings" //usage: "\n -s SIZE Send SIZE data bytes in packets (default 56)" //usage: "\n -i SECS Interval" //usage: "\n -A Ping as soon as reply is recevied" //usage: "\n -t TTL Set TTL" //usage: "\n -I IFACE/IP Source interface or IP address" //usage: "\n -W SEC Seconds to wait for the first response (default 10)" //usage: "\n (after all -c CNT packets are sent)" //usage: "\n -w SEC Seconds until ping exits (default:infinite)" //usage: "\n (can exit earlier with -c CNT)" //usage: "\n -q Quiet, only display output at start/finish" //usage: "\n -p HEXBYTE Payload pattern" //usage: //usage:# define ping6_trivial_usage //usage: "[OPTIONS] HOST" //usage:# define ping6_full_usage "\n\n" //usage: "Send ICMP ECHO_REQUESTs to HOST\n" //usage: "\n -c CNT Send only CNT pings" //usage: "\n -s SIZE Send SIZE data bytes in packets (default 56)" //usage: "\n -i SECS Interval" //usage: "\n -A Ping as soon as reply is recevied" ///////: "\n -t TTL Set TTL" ///////^^^^^ -t not tested for IPv6, might be not working //usage: "\n -I IFACE/IP Source interface or IP address" //usage: "\n -W SEC Seconds to wait for the first response (default 10)" //usage: "\n (after all -c CNT packets are sent)" //usage: "\n -w SEC Seconds until ping exits (default:infinite)" //usage: "\n (can exit earlier with -c CNT)" //usage: "\n -q Quiet, only display output at start/finish" //usage: "\n -p HEXBYTE Payload pattern" //usage: //usage:#endif //usage: //usage:#define ping_example_usage //usage: "$ ping localhost\n" //usage: "PING slag (127.0.0.1): 56 data bytes\n" //usage: "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n" //usage: "\n" //usage: "--- debian ping statistics ---\n" //usage: "1 packets transmitted, 1 packets received, 0% packet loss\n" //usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n" //usage:#define ping6_example_usage //usage: "$ ping6 ip6-localhost\n" //usage: "PING ip6-localhost (::1): 56 data bytes\n" //usage: "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n" //usage: "\n" //usage: "--- ip6-localhost ping statistics ---\n" //usage: "1 packets transmitted, 1 packets received, 0% packet loss\n" //usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n" #include #if defined(__FreeBSD__) # include /* struct ip and friends */ # include #endif #include #include "libbb.h" #include "common_bufsiz.h" #ifdef __BIONIC__ /* should be in netinet/ip_icmp.h */ # define ICMP_DEST_UNREACH 3 /* Destination Unreachable */ # define ICMP_SOURCE_QUENCH 4 /* Source Quench */ # define ICMP_REDIRECT 5 /* Redirect (change route) */ # define ICMP_ECHO 8 /* Echo Request */ # define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */ # define ICMP_PARAMETERPROB 12 /* Parameter Problem */ # define ICMP_TIMESTAMP 13 /* Timestamp Request */ # define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */ # define ICMP_INFO_REQUEST 15 /* Information Request */ # define ICMP_INFO_REPLY 16 /* Information Reply */ # define ICMP_ADDRESS 17 /* Address Mask Request */ # define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */ #endif /* Some operating systems, like GNU/Hurd, don't define SOL_RAW, but do have * IPPROTO_RAW. Since the IPPROTO definitions are also valid to use for * setsockopt (and take the same value as their corresponding SOL definitions, * if they exist), we can just fall back on IPPROTO_RAW. */ #ifndef SOL_RAW # define SOL_RAW IPPROTO_RAW #endif #if ENABLE_PING6 # include /* I see RENUMBERED constants in bits/in.h - !!? * What a fuck is going on with libc? Is it a glibc joke? */ # ifdef IPV6_2292HOPLIMIT # undef IPV6_HOPLIMIT # define IPV6_HOPLIMIT IPV6_2292HOPLIMIT # endif #endif #if defined(__FreeBSD__) /** * On BSD the IPv4 struct is called struct ip and instead of iXX * the members are called ip_XX. One could change this code to use * struct ip but that would require to define _BSD_SOURCE and that * might have other complications. Instead make sure struct iphdr * is present on FreeBSD. The below is taken from GLIBC. * * The GNU C Library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. */ struct iphdr { # if BYTE_ORDER == LITTLE_ENDIAN unsigned int ihl:4; unsigned int version:4; # elif BYTE_ORDER == BIG_ENDIAN unsigned int version:4; unsigned int ihl:4; # endif uint8_t tos; uint16_t tot_len; uint16_t id; uint16_t frag_off; uint8_t ttl; uint8_t protocol; uint16_t check; uint32_t saddr; uint32_t daddr; /*The options start here. */ }; #endif enum { DEFDATALEN = 56, MAXIPLEN = 60, MAXICMPLEN = 76, MAX_DUP_CHK = (8 * 128), MAXWAIT = 10, PINGINTERVAL = 1, /* 1 second */ pingsock = 0, }; static void #if ENABLE_PING6 create_icmp_socket(len_and_sockaddr *lsa) #else create_icmp_socket(void) #define create_icmp_socket(lsa) create_icmp_socket() #endif { int sock; #if ENABLE_PING6 if (lsa->u.sa.sa_family == AF_INET6) sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); else #endif sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */ if (sock < 0) { if (errno == EPERM) bb_simple_error_msg_and_die(bb_msg_perm_denied_are_you_root); bb_simple_perror_msg_and_die(bb_msg_can_not_create_raw_socket); } xmove_fd(sock, pingsock); } #if !ENABLE_FEATURE_FANCY_PING /* Simple version */ struct globals { char *hostname; char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; uint16_t myid; } FIX_ALIASING; #define G (*(struct globals*)bb_common_bufsiz1) #define INIT_G() do { setup_common_bufsiz(); } while (0) static void noresp(int ign UNUSED_PARAM) { printf("No response from %s\n", G.hostname); exit(EXIT_FAILURE); } static void ping4(len_and_sockaddr *lsa) { struct icmp *pkt; int c; pkt = (struct icmp *) G.packet; /*memset(pkt, 0, sizeof(G.packet)); already is */ pkt->icmp_type = ICMP_ECHO; pkt->icmp_id = G.myid; pkt->icmp_cksum = inet_cksum(pkt, sizeof(G.packet)); xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len); /* listen for replies */ while (1) { #if 0 struct sockaddr_in from; socklen_t fromlen = sizeof(from); c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0, (struct sockaddr *) &from, &fromlen); #else c = recv(pingsock, G.packet, sizeof(G.packet), 0); #endif if (c < 0) { if (errno != EINTR) bb_simple_perror_msg("recvfrom"); continue; } if (c >= 76) { /* ip + icmp */ struct iphdr *iphdr = (struct iphdr *) G.packet; pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */ if (pkt->icmp_id != G.myid) continue; /* not our ping */ if (pkt->icmp_type == ICMP_ECHOREPLY) break; } } } #if ENABLE_PING6 static void ping6(len_and_sockaddr *lsa) { struct icmp6_hdr *pkt; int c; int sockopt; pkt = (struct icmp6_hdr *) G.packet; /*memset(pkt, 0, sizeof(G.packet)); already is */ pkt->icmp6_type = ICMP6_ECHO_REQUEST; pkt->icmp6_id = G.myid; sockopt = offsetof(struct icmp6_hdr, icmp6_cksum); setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt); xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len); /* listen for replies */ while (1) { #if 0 struct sockaddr_in6 from; socklen_t fromlen = sizeof(from); c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0, (struct sockaddr *) &from, &fromlen); #else c = recv(pingsock, G.packet, sizeof(G.packet), 0); #endif if (c < 0) { if (errno != EINTR) bb_simple_perror_msg("recvfrom"); continue; } if (c >= ICMP_MINLEN) { /* icmp6_hdr */ if (pkt->icmp6_id != G.myid) continue; /* not our ping */ if (pkt->icmp6_type == ICMP6_ECHO_REPLY) break; } } } #endif #if !ENABLE_PING6 # define common_ping_main(af, argv) common_ping_main(argv) #endif static int common_ping_main(sa_family_t af, char **argv) { len_and_sockaddr *lsa; INIT_G(); #if ENABLE_PING6 while ((++argv)[0] && argv[0][0] == '-') { if (argv[0][1] == '4') { af = AF_INET; continue; } if (argv[0][1] == '6') { af = AF_INET6; continue; } bb_show_usage(); } #else argv++; #endif G.hostname = *argv; if (!G.hostname) bb_show_usage(); #if ENABLE_PING6 lsa = xhost_and_af2sockaddr(G.hostname, 0, af); #else lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET); #endif /* Set timer _after_ DNS resolution */ signal(SIGALRM, noresp); alarm(5); /* give the host 5000ms to respond */ create_icmp_socket(lsa); G.myid = (uint16_t) getpid(); /* we can use native-endian ident, but other Unix ping/traceroute * utils use *big-endian pid*, and e.g. traceroute on our machine may be * *not* from busybox, idents may collide. Follow the convention: */ G.myid = htons(G.myid); #if ENABLE_PING6 if (lsa->u.sa.sa_family == AF_INET6) ping6(lsa); else #endif ping4(lsa); if (ENABLE_FEATURE_CLEAN_UP) close(pingsock); printf("%s is alive!\n", G.hostname); return EXIT_SUCCESS; } #else /* FEATURE_FANCY_PING */ /* Full(er) version */ /* -c NUM, -t NUM, -w NUM, -W NUM */ #define OPT_STRING "qvAc:+s:t:+w:+W:+I:np:i:4"IF_PING6("6") enum { OPT_QUIET = 1 << 0, OPT_VERBOSE = 1 << 1, OPT_A = 1 << 2, OPT_c = 1 << 3, OPT_s = 1 << 4, OPT_t = 1 << 5, OPT_w = 1 << 6, OPT_W = 1 << 7, OPT_I = 1 << 8, /*OPT_n = 1 << 9, - ignored */ OPT_p = 1 << 10, OPT_i = 1 << 11, OPT_IPV4 = 1 << 12, OPT_IPV6 = (1 << 13) * ENABLE_PING6, }; struct globals { int if_index; char *str_I; len_and_sockaddr *source_lsa; unsigned datalen; unsigned pingcount; /* must be int-sized */ unsigned opt_ttl; unsigned long ntransmitted, nreceived, nrepeats; uint16_t myid; uint8_t pattern; unsigned tmin, tmax; /* in us */ unsigned long long tsum; /* in us, sum of all times */ unsigned cur_us; /* low word only, we don't need more */ unsigned deadline_us; unsigned interval_us; unsigned timeout; unsigned sizeof_rcv_packet; char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */ void *snd_packet; /* [datalen + ipv4/ipv6_const] */ const char *hostname; const char *dotted; union { struct sockaddr sa; struct sockaddr_in sin; #if ENABLE_PING6 struct sockaddr_in6 sin6; #endif } pingaddr; unsigned char rcvd_tbl[MAX_DUP_CHK / 8]; } FIX_ALIASING; #define G (*(struct globals*)bb_common_bufsiz1) #define if_index (G.if_index ) #define source_lsa (G.source_lsa ) #define str_I (G.str_I ) #define datalen (G.datalen ) #define pingcount (G.pingcount ) #define opt_ttl (G.opt_ttl ) #define myid (G.myid ) #define tmin (G.tmin ) #define tmax (G.tmax ) #define tsum (G.tsum ) #define timeout (G.timeout ) #define hostname (G.hostname ) #define dotted (G.dotted ) #define pingaddr (G.pingaddr ) #define rcvd_tbl (G.rcvd_tbl ) #define INIT_G() do { \ setup_common_bufsiz(); \ BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \ datalen = DEFDATALEN; \ timeout = MAXWAIT; \ tmin = UINT_MAX; \ } while (0) #define BYTE(bit) rcvd_tbl[(bit)>>3] #define MASK(bit) (1 << ((bit) & 7)) #define SET(bit) (BYTE(bit) |= MASK(bit)) #define CLR(bit) (BYTE(bit) &= (~MASK(bit))) #define TST(bit) (BYTE(bit) & MASK(bit)) static void print_stats_and_exit(int junk) NORETURN; static void print_stats_and_exit(int junk UNUSED_PARAM) { unsigned long ul; unsigned long nrecv; signal(SIGINT, SIG_IGN); nrecv = G.nreceived; printf("\n--- %s ping statistics ---\n" "%lu packets transmitted, " "%lu packets received, ", hostname, G.ntransmitted, nrecv ); if (G.nrepeats) printf("%lu duplicates, ", G.nrepeats); ul = G.ntransmitted; if (ul != 0) ul = (ul - nrecv) * 100 / ul; printf("%lu%% packet loss\n", ul); if (tmin != UINT_MAX) { unsigned tavg = tsum / (nrecv + G.nrepeats); printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n", tmin / 1000, tmin % 1000, tavg / 1000, tavg % 1000, tmax / 1000, tmax % 1000); } /* if condition is true, exit with 1 -- 'failure' */ exit(nrecv == 0 || (G.deadline_us && nrecv < pingcount)); } static void sendping_tail(void (*sp)(int), int size_pkt) { int sz; if (G.deadline_us) { unsigned n = G.cur_us - G.deadline_us; if ((int)n >= 0) print_stats_and_exit(0); } CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK); G.ntransmitted++; size_pkt += datalen; /* sizeof(pingaddr) can be larger than real sa size, but I think * it doesn't matter */ sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr)); if (sz != size_pkt) bb_simple_error_msg_and_die(bb_msg_write_error); if (pingcount == 0 || G.ntransmitted < pingcount) { /* Didn't send all pings yet - schedule next in -i SEC interval */ struct itimerval i; signal(SIGALRM, sp); /*ualarm(G.interval_us, 0); - does not work for >=1sec on some libc */ i.it_interval.tv_sec = 0; i.it_interval.tv_usec = 0; i.it_value.tv_sec = G.interval_us / 1000000; i.it_value.tv_usec = G.interval_us % 1000000; setitimer(ITIMER_REAL, &i, NULL); } else { /* -c NN, and all NN are sent */ /* Wait for the last ping to come back. * -W timeout: wait for a response in seconds. * Affects only timeout in absence of any responses, * otherwise ping waits for two RTTs. */ unsigned expire = timeout; if (G.nreceived) { /* approx. 2*tmax, in seconds (2 RTT) */ expire = tmax / (512*1024); if (expire == 0) expire = 1; } signal(SIGALRM, print_stats_and_exit); alarm(expire); } } static void sendping4(int junk UNUSED_PARAM) { struct icmp *pkt = G.snd_packet; memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4); pkt->icmp_type = ICMP_ECHO; /*pkt->icmp_code = 0;*/ pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */ pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */ pkt->icmp_id = myid; /* If datalen < 4, we store timestamp _past_ the packet, * but it's ok - we allocated 4 extra bytes in xzalloc() just in case. */ /*if (datalen >= 4)*/ /* No hton: we'll read it back on the same machine */ *(uint32_t*)&pkt->icmp_dun = G.cur_us = monotonic_us(); pkt->icmp_cksum = inet_cksum(pkt, datalen + ICMP_MINLEN); sendping_tail(sendping4, ICMP_MINLEN); } #if ENABLE_PING6 static void sendping6(int junk UNUSED_PARAM) { struct icmp6_hdr *pkt = G.snd_packet; memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4); pkt->icmp6_type = ICMP6_ECHO_REQUEST; /*pkt->icmp6_code = 0;*/ /*pkt->icmp6_cksum = 0;*/ pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */ pkt->icmp6_id = myid; /*if (datalen >= 4)*/ *(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = G.cur_us = monotonic_us(); //TODO? pkt->icmp_cksum = inet_cksum(...); sendping_tail(sendping6, sizeof(struct icmp6_hdr)); } #endif static const char *icmp_type_name(int id) { switch (id) { case ICMP_ECHOREPLY: return "Echo Reply"; case ICMP_DEST_UNREACH: return "Destination Unreachable"; case ICMP_SOURCE_QUENCH: return "Source Quench"; case ICMP_REDIRECT: return "Redirect (change route)"; case ICMP_ECHO: return "Echo Request"; case ICMP_TIME_EXCEEDED: return "Time Exceeded"; case ICMP_PARAMETERPROB: return "Parameter Problem"; case ICMP_TIMESTAMP: return "Timestamp Request"; case ICMP_TIMESTAMPREPLY: return "Timestamp Reply"; case ICMP_INFO_REQUEST: return "Information Request"; case ICMP_INFO_REPLY: return "Information Reply"; case ICMP_ADDRESS: return "Address Mask Request"; case ICMP_ADDRESSREPLY: return "Address Mask Reply"; default: return "unknown ICMP type"; } } #if ENABLE_PING6 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee! * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */ #ifndef MLD_LISTENER_QUERY # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY #endif #ifndef MLD_LISTENER_REPORT # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT #endif #ifndef MLD_LISTENER_REDUCTION # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION #endif static const char *icmp6_type_name(int id) { switch (id) { case ICMP6_DST_UNREACH: return "Destination Unreachable"; case ICMP6_PACKET_TOO_BIG: return "Packet too big"; case ICMP6_TIME_EXCEEDED: return "Time Exceeded"; case ICMP6_PARAM_PROB: return "Parameter Problem"; case ICMP6_ECHO_REPLY: return "Echo Reply"; case ICMP6_ECHO_REQUEST: return "Echo Request"; case MLD_LISTENER_QUERY: return "Listener Query"; case MLD_LISTENER_REPORT: return "Listener Report"; case MLD_LISTENER_REDUCTION: return "Listener Reduction"; default: return "unknown ICMP type"; } } #endif static void unpack_tail(int sz, uint32_t *tp, const char *from_str, uint16_t recv_seq, int ttl) { unsigned char *b, m; const char *dupmsg = " (DUP!)"; unsigned triptime = triptime; /* for gcc */ if (tp) { /* (int32_t) cast is for hypothetical 64-bit unsigned */ /* (doesn't hurt 32-bit real-world anyway) */ triptime = (int32_t) ((uint32_t)monotonic_us() - *tp); tsum += triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) tmax = triptime; } b = &BYTE(recv_seq % MAX_DUP_CHK); m = MASK(recv_seq % MAX_DUP_CHK); /*if TST(recv_seq % MAX_DUP_CHK):*/ if (*b & m) { ++G.nrepeats; } else { /*SET(recv_seq % MAX_DUP_CHK):*/ *b |= m; ++G.nreceived; dupmsg += 7; } if (option_mask32 & OPT_QUIET) return; printf("%d bytes from %s: seq=%u ttl=%d", sz, from_str, recv_seq, ttl); if (tp) printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000); puts(dupmsg); fflush_all(); } static int unpack4(char *buf, int sz, struct sockaddr_in *from) { struct icmp *icmppkt; struct iphdr *iphdr; int hlen; /* discard if too short */ if (sz < (datalen + ICMP_MINLEN)) return 0; /* check IP header */ iphdr = (struct iphdr *) buf; hlen = iphdr->ihl << 2; sz -= hlen; icmppkt = (struct icmp *) (buf + hlen); if (icmppkt->icmp_id != myid) return 0; /* not our ping */ if (icmppkt->icmp_type == ICMP_ECHOREPLY) { uint16_t recv_seq = ntohs(icmppkt->icmp_seq); uint32_t *tp = NULL; if (sz >= ICMP_MINLEN + sizeof(uint32_t)) tp = (uint32_t *) icmppkt->icmp_data; unpack_tail(sz, tp, inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), recv_seq, iphdr->ttl); return 1; } if (icmppkt->icmp_type != ICMP_ECHO) { bb_error_msg("warning: got ICMP %d (%s)", icmppkt->icmp_type, icmp_type_name(icmppkt->icmp_type)); } return 0; } #if ENABLE_PING6 static int unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit) { struct icmp6_hdr *icmppkt; char buf[INET6_ADDRSTRLEN]; /* discard if too short */ if (sz < (datalen + sizeof(struct icmp6_hdr))) return 0; icmppkt = (struct icmp6_hdr *) packet; if (icmppkt->icmp6_id != myid) return 0; /* not our ping */ if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) { uint16_t recv_seq = ntohs(icmppkt->icmp6_seq); uint32_t *tp = NULL; if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t)) tp = (uint32_t *) &icmppkt->icmp6_data8[4]; unpack_tail(sz, tp, inet_ntop(AF_INET6, &from->sin6_addr, buf, sizeof(buf)), recv_seq, hoplimit); return 1; } if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) { bb_error_msg("warning: got ICMP %d (%s)", icmppkt->icmp6_type, icmp6_type_name(icmppkt->icmp6_type)); } return 0; } #endif static void ping4(len_and_sockaddr *lsa) { int sockopt; pingaddr.sin = lsa->u.sin; if (source_lsa) { if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF, &source_lsa->u.sa, source_lsa->len)) bb_simple_error_msg_and_die("can't set multicast source interface"); xbind(pingsock, &source_lsa->u.sa, source_lsa->len); } /* enable broadcast pings */ setsockopt_broadcast(pingsock); /* set recv buf (needed if we can get lots of responses: flood ping, * broadcast ping etc) */ sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */ setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt); if (opt_ttl != 0) { setsockopt_int(pingsock, IPPROTO_IP, IP_TTL, opt_ttl); /* above doesn't affect packets sent to bcast IP, so... */ setsockopt_int(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, opt_ttl); } signal(SIGINT, print_stats_and_exit); /* start the ping's going ... */ send_ping: sendping4(0); /* listen for replies */ while (1) { struct sockaddr_in from; socklen_t fromlen = (socklen_t) sizeof(from); int c; c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0, (struct sockaddr *) &from, &fromlen); if (c < 0) { if (errno != EINTR) bb_simple_perror_msg("recvfrom"); continue; } c = unpack4(G.rcv_packet, c, &from); if (pingcount && G.nreceived >= pingcount) break; if (c && (option_mask32 & OPT_A)) { goto send_ping; } } } #if ENABLE_PING6 static void ping6(len_and_sockaddr *lsa) { int sockopt; struct msghdr msg; struct sockaddr_in6 from; struct iovec iov; char control_buf[CMSG_SPACE(36)]; pingaddr.sin6 = lsa->u.sin6; if (source_lsa) xbind(pingsock, &source_lsa->u.sa, source_lsa->len); #ifdef ICMP6_FILTER { struct icmp6_filter filt; if (!(option_mask32 & OPT_VERBOSE)) { ICMP6_FILTER_SETBLOCKALL(&filt); ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt); } else { ICMP6_FILTER_SETPASSALL(&filt); } if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, sizeof(filt)) < 0) bb_error_msg_and_die("setsockopt(%s)", "ICMP6_FILTER"); } #endif /*ICMP6_FILTER*/ /* enable broadcast pings */ setsockopt_broadcast(pingsock); /* set recv buf (needed if we can get lots of responses: flood ping, * broadcast ping etc) */ sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */ setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt); sockopt = offsetof(struct icmp6_hdr, icmp6_cksum); BUILD_BUG_ON(offsetof(struct icmp6_hdr, icmp6_cksum) != 2); setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt); /* request ttl info to be returned in ancillary data */ setsockopt_1(pingsock, SOL_IPV6, IPV6_HOPLIMIT); if (if_index) pingaddr.sin6.sin6_scope_id = if_index; signal(SIGINT, print_stats_and_exit); msg.msg_name = &from; msg.msg_namelen = sizeof(from); msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = control_buf; iov.iov_base = G.rcv_packet; iov.iov_len = G.sizeof_rcv_packet; /* start the ping's going ... */ send_ping: sendping6(0); /* listen for replies */ while (1) { int c; struct cmsghdr *mp; int hoplimit = -1; msg.msg_controllen = sizeof(control_buf); c = recvmsg(pingsock, &msg, 0); if (c < 0) { if (errno != EINTR) bb_simple_perror_msg("recvfrom"); continue; } for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) { if (mp->cmsg_level == SOL_IPV6 && mp->cmsg_type == IPV6_HOPLIMIT /* don't check len - we trust the kernel: */ /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */ ) { /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */ move_from_unaligned_int(hoplimit, CMSG_DATA(mp)); } } c = unpack6(G.rcv_packet, c, &from, hoplimit); if (pingcount && G.nreceived >= pingcount) break; if (c && (option_mask32 & OPT_A)) { goto send_ping; } } } #endif static void ping(len_and_sockaddr *lsa) { printf("PING %s (%s)", hostname, dotted); if (source_lsa) { printf(" from %s", xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa)); } printf(": %d data bytes\n", datalen); create_icmp_socket(lsa); /* untested whether "-I addr" really works for IPv6: */ if (str_I) setsockopt_bindtodevice(pingsock, str_I); G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN; G.rcv_packet = xzalloc(G.sizeof_rcv_packet); #if ENABLE_PING6 if (lsa->u.sa.sa_family == AF_INET6) { /* +4 reserves a place for timestamp, which may end up sitting * _after_ packet. Saves one if() - see sendping4/6() */ G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4); ping6(lsa); } else #endif { G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4); ping4(lsa); } } static int common_ping_main(int opt, char **argv) { len_and_sockaddr *lsa; char *str_s, *str_p; char *str_i = (char*)"1"; duration_t interval; INIT_G(); opt |= getopt32(argv, "^" OPT_STRING /* exactly one arg; -v and -q don't mix */ "\0" "=1:q--v:v--q", &pingcount, &str_s, &opt_ttl, &G.deadline_us, &timeout, &str_I, &str_p, &str_i ); if (opt & OPT_s) datalen = xatou16(str_s); // -s if (opt & OPT_I) { // -I if_index = if_nametoindex(str_I); if (!if_index) { /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */ source_lsa = xdotted2sockaddr(str_I, 0); str_I = NULL; /* don't try to bind to device later */ } } if (opt & OPT_p) G.pattern = xstrtou_range(str_p, 16, 0, 255); if (G.deadline_us) { unsigned d = G.deadline_us < INT_MAX/1000000 ? G.deadline_us : INT_MAX/1000000; G.deadline_us = 1 | ((d * 1000000) + monotonic_us()); } interval = parse_duration_str(str_i); if (interval > INT_MAX/1000000) interval = INT_MAX/1000000; G.interval_us = interval * 1000000; myid = (uint16_t) getpid(); /* we can use native-endian ident, but other Unix ping/traceroute * utils use *big-endian pid*, and e.g. traceroute on our machine may be * *not* from busybox, idents may collide. Follow the convention: */ myid = htons(myid); hostname = argv[optind]; #if ENABLE_PING6 { sa_family_t af = AF_UNSPEC; if (opt & OPT_IPV4) af = AF_INET; if (opt & OPT_IPV6) af = AF_INET6; lsa = xhost_and_af2sockaddr(hostname, 0, af); } #else lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET); #endif if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family) /* leaking it here... */ source_lsa = NULL; dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); ping(lsa); print_stats_and_exit(0); /*return EXIT_SUCCESS;*/ } #endif /* FEATURE_FANCY_PING */ #if ENABLE_PING int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int ping_main(int argc UNUSED_PARAM, char **argv) { # if !ENABLE_FEATURE_FANCY_PING return common_ping_main(AF_UNSPEC, argv); # else return common_ping_main(0, argv); # endif } #endif #if ENABLE_PING6 int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int ping6_main(int argc UNUSED_PARAM, char **argv) { # if !ENABLE_FEATURE_FANCY_PING return common_ping_main(AF_INET6, argv); # else return common_ping_main(OPT_IPV6, argv); # endif } #endif /* from ping6.c: * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Muuss. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. * * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */