X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fping.c;h=e413bec701abbc677fb1a0d1e3fb1b22b66009eb;hb=c2b3e370d6b98ef37d48582d55b26794ac2bf63f;hp=1afcb28b151d0ba51b3516662519574fd77e8ea4;hpb=bf381a0ad83a77d054a99da2b585c43dfe71c6d1;p=oweals%2Fbusybox.git diff --git a/networking/ping.c b/networking/ping.c index 1afcb28b1..e413bec70 100644 --- a/networking/ping.c +++ b/networking/ping.c @@ -1,155 +1,56 @@ /* vi: set sw=4 ts=4: */ /* - * $Id: ping.c,v 1.42 2001/05/16 15:52:23 kraai Exp $ * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. + * Adapted from the ping in netkit-base 0.10: + * Copyright (c) 1989 The Regents of the University of California. + * All rights reserved. * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. + * This code is derived from software contributed to Berkeley by + * Mike Muuss. * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ +/* 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: * - * 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. - * * 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 */ -#include -#include -#include -#include -#include -#include - -#include -#include +#include #include -#include -#include -#include -#include -#include -#include -#include -#include #include "busybox.h" - -/* It turns out that libc5 doesn't have proper icmp support - * built into it header files, so we have to supplement it */ -#if __GNU_LIBRARY__ < 5 -static const int ICMP_MINLEN = 8; /* abs minimum */ - -struct icmp_ra_addr -{ - u_int32_t ira_addr; - u_int32_t ira_preference; -}; - - -struct icmp -{ - u_int8_t icmp_type; /* type of message, see below */ - u_int8_t icmp_code; /* type sub code */ - u_int16_t icmp_cksum; /* ones complement checksum of struct */ - union - { - u_char ih_pptr; /* ICMP_PARAMPROB */ - struct in_addr ih_gwaddr; /* gateway address */ - struct ih_idseq /* echo datagram */ - { - u_int16_t icd_id; - u_int16_t icd_seq; - } ih_idseq; - u_int32_t ih_void; - - /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ - struct ih_pmtu - { - u_int16_t ipm_void; - u_int16_t ipm_nextmtu; - } ih_pmtu; - - struct ih_rtradv - { - u_int8_t irt_num_addrs; - u_int8_t irt_wpa; - u_int16_t irt_lifetime; - } ih_rtradv; - } icmp_hun; -#define icmp_pptr icmp_hun.ih_pptr -#define icmp_gwaddr icmp_hun.ih_gwaddr -#define icmp_id icmp_hun.ih_idseq.icd_id -#define icmp_seq icmp_hun.ih_idseq.icd_seq -#define icmp_void icmp_hun.ih_void -#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void -#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu -#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs -#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa -#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime - union - { - struct - { - u_int32_t its_otime; - u_int32_t its_rtime; - u_int32_t its_ttime; - } id_ts; - struct - { - struct ip idi_ip; - /* options and then 64 bits of data */ - } id_ip; - struct icmp_ra_addr id_radv; - u_int32_t id_mask; - u_int8_t id_data[1]; - } icmp_dun; -#define icmp_otime icmp_dun.id_ts.its_otime -#define icmp_rtime icmp_dun.id_ts.its_rtime -#define icmp_ttime icmp_dun.id_ts.its_ttime -#define icmp_ip icmp_dun.id_ip.idi_ip -#define icmp_radv icmp_dun.id_radv -#define icmp_mask icmp_dun.id_mask -#define icmp_data icmp_dun.id_data -}; +#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 -static const int DEFDATALEN = 56; -static const int MAXIPLEN = 60; -static const int MAXICMPLEN = 76; -static const int MAXPACKET = 65468; -#define MAX_DUP_CHK (8 * 128) -static const int MAXWAIT = 10; -static const int PINGINTERVAL = 1; /* second */ - -#define O_QUIET (1 << 0) - -#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ -#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ -#define SET(bit) (A(bit) |= B(bit)) -#define CLR(bit) (A(bit) &= (~B(bit))) -#define TST(bit) (A(bit) & B(bit)) - -static void ping(const char *host); +enum { + DEFDATALEN = 56, + MAXIPLEN = 60, + MAXICMPLEN = 76, + MAXPACKET = 65468, + MAX_DUP_CHK = (8 * 128), + MAXWAIT = 10, + PINGINTERVAL = 1, /* 1 second */ +}; /* common routines */ + static int in_cksum(unsigned short *buf, int sz) { int nleft = sz; @@ -170,63 +71,49 @@ static int in_cksum(unsigned short *buf, int sz) sum = (sum >> 16) + (sum & 0xFFFF); sum += (sum >> 16); ans = ~sum; - return (ans); + return ans; } +#if !ENABLE_FEATURE_FANCY_PING + /* simple version */ -#ifdef BB_FEATURE_SIMPLE_PING -static char *hostname = NULL; -static void noresp(int ign) +static char *hostname; + +static void noresp(int ign ATTRIBUTE_UNUSED) { printf("No response from %s\n", hostname); - exit(0); + exit(EXIT_FAILURE); } -static void ping(const char *host) +static void ping4(len_and_sockaddr *lsa) { - struct hostent *h; struct sockaddr_in pingaddr; struct icmp *pkt; int pingsock, c; char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; - if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) /* 1 == ICMP */ - perror_msg_and_die("creating a raw socket"); - - /* drop root privs if running setuid */ - setuid(getuid()); - - memset(&pingaddr, 0, sizeof(struct sockaddr_in)); - - pingaddr.sin_family = AF_INET; - h = xgethostbyname(host); - memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); - hostname = h->h_name; + pingsock = create_icmp_socket(); + pingaddr = lsa->sin; pkt = (struct icmp *) packet; memset(pkt, 0, sizeof(packet)); pkt->icmp_type = ICMP_ECHO; pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); - c = sendto(pingsock, packet, sizeof(packet), 0, - (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); + c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, + (struct sockaddr *) &pingaddr, sizeof(pingaddr)); - if (c < 0 || c != sizeof(packet)) - perror_msg_and_die("sendto"); - - signal(SIGALRM, noresp); - alarm(5); /* give the host 5000ms to respond */ /* listen for replies */ while (1) { struct sockaddr_in from; - size_t fromlen = sizeof(from); + socklen_t fromlen = sizeof(from); - if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, - (struct sockaddr *) &from, &fromlen)) < 0) { - if (errno == EINTR) - continue; - perror_msg("recvfrom"); + c = recvfrom(pingsock, packet, sizeof(packet), 0, + (struct sockaddr *) &from, &fromlen); + if (c < 0) { + if (errno != EINTR) + bb_perror_msg("recvfrom"); continue; } if (c >= 76) { /* ip + icmp */ @@ -237,149 +124,283 @@ static void ping(const char *host) break; } } - printf("%s is alive!\n", hostname); - return; + if (ENABLE_FEATURE_CLEAN_UP) + close(pingsock); } -extern int ping_main(int argc, char **argv) +#if ENABLE_PING6 +static void ping6(len_and_sockaddr *lsa) { - argc--; + struct sockaddr_in6 pingaddr; + struct icmp6_hdr *pkt; + int pingsock, c; + int sockopt; + char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; + + pingsock = create_icmp6_socket(); + pingaddr = lsa->sin6; + + pkt = (struct icmp6_hdr *) packet; + memset(pkt, 0, sizeof(packet)); + pkt->icmp6_type = ICMP6_ECHO_REQUEST; + + sockopt = offsetof(struct icmp6_hdr, icmp6_cksum); + setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt)); + + c = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), + (struct sockaddr *) &pingaddr, sizeof(pingaddr)); + + /* listen for replies */ + while (1) { + struct sockaddr_in6 from; + socklen_t fromlen = sizeof(from); + + c = recvfrom(pingsock, packet, sizeof(packet), 0, + (struct sockaddr *) &from, &fromlen); + if (c < 0) { + if (errno != EINTR) + bb_perror_msg("recvfrom"); + continue; + } + if (c >= 8) { /* icmp6_hdr */ + pkt = (struct icmp6_hdr *) packet; + if (pkt->icmp6_type == ICMP6_ECHO_REPLY) + break; + } + } + if (ENABLE_FEATURE_CLEAN_UP) + close(pingsock); +} +#endif + +int ping_main(int argc, char **argv); +int ping_main(int argc, char **argv) +{ + len_and_sockaddr *lsa; +#if ENABLE_PING6 + sa_family_t af = AF_UNSPEC; + while (++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++; - if (argc < 1) - show_usage(); - ping(*argv); +#endif + + hostname = *argv; + if (!hostname) + bb_show_usage(); + +#if ENABLE_PING6 + lsa = xhost_and_af2sockaddr(hostname, 0, af); +#else + lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET); +#endif + /* Set timer _after_ DNS resolution */ + signal(SIGALRM, noresp); + alarm(5); /* give the host 5000ms to respond */ + +#if ENABLE_PING6 + if (lsa->sa.sa_family == AF_INET6) + ping6(lsa); + else +#endif + ping4(lsa); + printf("%s is alive!\n", hostname); return EXIT_SUCCESS; } -#else /* ! BB_FEATURE_SIMPLE_PING */ + +#else /* FEATURE_FANCY_PING */ + + /* full(er) version */ -static char *hostname = NULL; -static struct sockaddr_in pingaddr; + +#define OPT_STRING ("qvc:s:I:4" USE_PING6("6")) +enum { + OPT_QUIET = 1 << 0, + OPT_VERBOSE = 1 << 1, + OPT_c = 1 << 2, + OPT_s = 1 << 3, + OPT_I = 1 << 4, + OPT_IPV4 = 1 << 5, + OPT_IPV6 = (1 << 6) * ENABLE_PING6, +}; + + +static union { + struct sockaddr sa; + struct sockaddr_in sin; +#if ENABLE_PING6 + struct sockaddr_in6 sin6; +#endif +} pingaddr; +static len_and_sockaddr *source_lsa; static int pingsock = -1; -static int datalen; /* intentionally uninitialized to work around gcc bug */ +static unsigned datalen; /* intentionally uninitialized to work around gcc bug */ -static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0; -static int myid = 0, options = 0; -static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0; +static int if_index; + +static unsigned long ntransmitted, nreceived, nrepeats, pingcount; +static int myid; +static unsigned tmin = UINT_MAX, tmax; +static unsigned long tsum; static char rcvd_tbl[MAX_DUP_CHK / 8]; -static void sendping(int); -static void pingstats(int); -static void unpack(char *, int, struct sockaddr_in *); +static const char *hostname; +static const char *dotted; + +#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ +#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ +#define SET(bit) (A(bit) |= B(bit)) +#define CLR(bit) (A(bit) &= (~B(bit))) +#define TST(bit) (A(bit) & B(bit)) /**************************************************************************/ -static void pingstats(int junk) +static void pingstats(int junk ATTRIBUTE_UNUSED) { - int status; - signal(SIGINT, SIG_IGN); printf("\n--- %s ping statistics ---\n", hostname); - printf("%ld packets transmitted, ", ntransmitted); - printf("%ld packets received, ", nreceived); + printf("%lu packets transmitted, ", ntransmitted); + printf("%lu packets received, ", nreceived); if (nrepeats) - printf("%ld duplicates, ", nrepeats); + printf("%lu duplicates, ", nrepeats); if (ntransmitted) - printf("%ld%% packet loss\n", - (ntransmitted - nreceived) * 100 / ntransmitted); - if (nreceived) - printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n", - tmin / 10, tmin % 10, - (tsum / (nreceived + nrepeats)) / 10, - (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10); - if (nreceived != 0) - status = EXIT_SUCCESS; - else - status = EXIT_FAILURE; - exit(status); + ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted; + printf("%lu%% packet loss\n", ntransmitted); + if (tmin != UINT_MAX) + printf("round-trip min/avg/max = %u.%u/%lu.%lu/%u.%u ms\n", + tmin / 10, tmin % 10, + (tsum / (nreceived + nrepeats)) / 10, + (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10); + exit(nreceived == 0); /* (nreceived == 0) is true (1) -- 'failure' */ } -static void sendping(int junk) +static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt) { - struct icmp *pkt; - int i; - char packet[datalen + 8]; + int sz; - pkt = (struct icmp *) packet; + CLR((uint16_t)ntransmitted % MAX_DUP_CHK); + ntransmitted++; + + /* sizeof(pingaddr) can be larger than real sa size, but I think + * it doesn't matter */ + sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr)); + if (sz != size_pkt) + bb_error_msg_and_die(bb_msg_write_error); + + signal(SIGALRM, sp); + if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */ + alarm(PINGINTERVAL); + } else { /* done, wait for the last ping to come back */ + /* todo, don't necessarily need to wait so long... */ + signal(SIGALRM, pingstats); + alarm(MAXWAIT); + } +} + +static void sendping4(int junk ATTRIBUTE_UNUSED) +{ + struct icmp *pkt = alloca(datalen + ICMP_MINLEN); pkt->icmp_type = ICMP_ECHO; pkt->icmp_code = 0; pkt->icmp_cksum = 0; - pkt->icmp_seq = ntransmitted++; + pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */ pkt->icmp_id = myid; - CLR(pkt->icmp_seq % MAX_DUP_CHK); + gettimeofday((struct timeval *) &pkt->icmp_dun, NULL); + pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN); - gettimeofday((struct timeval *) &packet[8], NULL); - pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); + sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN); +} +#if ENABLE_PING6 +static void sendping6(int junk ATTRIBUTE_UNUSED) +{ + struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr)); - i = sendto(pingsock, packet, sizeof(packet), 0, - (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); + pkt->icmp6_type = ICMP6_ECHO_REQUEST; + pkt->icmp6_code = 0; + pkt->icmp6_cksum = 0; + pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */ + pkt->icmp6_id = myid; + gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL); - if (i < 0) - perror_msg_and_die("sendto"); - else if ((size_t)i != sizeof(packet)) - error_msg_and_die("ping wrote %d chars; %d expected", i, - (int)sizeof(packet)); + sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr)); +} +#endif - signal(SIGALRM, sendping); - if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */ - alarm(PINGINTERVAL); - } else { /* done, wait for the last ping to come back */ - /* todo, don't necessarily need to wait so long... */ - signal(SIGALRM, pingstats); - alarm(MAXWAIT); +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"; } } - -static char *icmp_type_name (int id) +#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 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"; + 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(char *buf, int sz, struct sockaddr_in *from) +static void unpack_tail(int sz, struct timeval *tp, + const char *from_str, + uint16_t recv_seq, int ttl) { - struct icmp *icmppkt; - struct iphdr *iphdr; - struct timeval tv, *tp; - int hlen, dupflag; - unsigned long triptime; - - gettimeofday(&tv, NULL); - - /* check IP header */ - iphdr = (struct iphdr *) buf; - hlen = iphdr->ihl << 2; - /* discard if too short */ - if (sz < (datalen + ICMP_MINLEN)) - return; - - sz -= hlen; - icmppkt = (struct icmp *) (buf + hlen); + const char *dupmsg = " (DUP!)"; + unsigned triptime = triptime; /* for gcc */ - if (icmppkt->icmp_id != myid) - return; /* not our ping */ + ++nreceived; - if (icmppkt->icmp_type == ICMP_ECHOREPLY) { - ++nreceived; - tp = (struct timeval *) icmppkt->icmp_data; + if (tp) { + struct timeval tv; - if ((tv.tv_usec -= tp->tv_usec) < 0) { + gettimeofday(&tv, NULL); + tv.tv_usec -= tp->tv_usec; + if (tv.tv_usec < 0) { --tv.tv_sec; tv.tv_usec += 1000000; } @@ -391,86 +412,112 @@ static void unpack(char *buf, int sz, struct sockaddr_in *from) tmin = triptime; if (triptime > tmax) tmax = triptime; + } - if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) { - ++nrepeats; - --nreceived; - dupflag = 1; - } else { - SET(icmppkt->icmp_seq % MAX_DUP_CHK); - dupflag = 0; - } + if (TST(recv_seq % MAX_DUP_CHK)) { + ++nrepeats; + --nreceived; + } else { + SET(recv_seq % MAX_DUP_CHK); + dupmsg += 7; + } - if (options & O_QUIET) - return; - - printf("%d bytes from %s: icmp_seq=%u", sz, - inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), - icmppkt->icmp_seq); - printf(" ttl=%d", iphdr->ttl); - printf(" time=%lu.%lu ms", triptime / 10, triptime % 10); - if (dupflag) - printf(" (DUP!)"); - printf("\n"); - } else - if (icmppkt->icmp_type != ICMP_ECHO) - error_msg("Warning: Got ICMP %d (%s)", - icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type)); -} + if (option_mask32 & OPT_QUIET) + return; -static void ping(const char *host) + printf("%d bytes from %s: seq=%u ttl=%d", sz, + from_str, recv_seq, ttl); + if (tp) + printf(" time=%u.%u ms", triptime / 10, triptime % 10); + puts(dupmsg); + fflush(stdout); +} +static void unpack4(char *buf, int sz, struct sockaddr_in *from) { - struct protoent *proto; - struct hostent *h; - char buf[MAXHOSTNAMELEN]; - char packet[datalen + MAXIPLEN + MAXICMPLEN]; - int sockopt; + struct icmp *icmppkt; + struct iphdr *iphdr; + int hlen; - proto = getprotobyname("icmp"); - /* if getprotobyname failed, just silently force - * proto->p_proto to have the correct value for "icmp" */ - if ((pingsock = socket(AF_INET, SOCK_RAW, - (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */ - if (errno == EPERM) - error_msg_and_die("permission denied. (are you root?)"); - else - perror_msg_and_die("creating a raw socket"); + /* discard if too short */ + if (sz < (datalen + ICMP_MINLEN)) + return; + + /* check IP header */ + iphdr = (struct iphdr *) buf; + hlen = iphdr->ihl << 2; + sz -= hlen; + icmppkt = (struct icmp *) (buf + hlen); + if (icmppkt->icmp_id != myid) + return; /* not our ping */ + + if (icmppkt->icmp_type == ICMP_ECHOREPLY) { + uint16_t recv_seq = ntohs(icmppkt->icmp_seq); + struct timeval *tp = NULL; + + if (sz >= ICMP_MINLEN + sizeof(struct timeval)) + tp = (struct timeval *) icmppkt->icmp_data; + unpack_tail(sz, tp, + inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), + recv_seq, iphdr->ttl); + } else if (icmppkt->icmp_type != ICMP_ECHO) { + bb_error_msg("warning: got ICMP %d (%s)", + icmppkt->icmp_type, + icmp_type_name(icmppkt->icmp_type)); } +} +#if ENABLE_PING6 +static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit) +{ + struct icmp6_hdr *icmppkt; + char buf[INET6_ADDRSTRLEN]; - /* drop root privs if running setuid */ - setuid(getuid()); + /* discard if too short */ + if (sz < (datalen + sizeof(struct icmp6_hdr))) + return; - memset(&pingaddr, 0, sizeof(struct sockaddr_in)); + icmppkt = (struct icmp6_hdr *) packet; + if (icmppkt->icmp6_id != myid) + return; /* not our ping */ + + if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) { + uint16_t recv_seq = ntohs(icmppkt->icmp6_seq); + struct timeval *tp = NULL; + + if (sz >= sizeof(struct icmp6_hdr) + sizeof(struct timeval)) + tp = (struct timeval *) &icmppkt->icmp6_data8[4]; + unpack_tail(sz, tp, + inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr, + buf, sizeof(buf)), + recv_seq, hoplimit); + } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) { + bb_error_msg("warning: got ICMP %d (%s)", + icmppkt->icmp6_type, + icmp6_type_name(icmppkt->icmp6_type)); + } +} +#endif - pingaddr.sin_family = AF_INET; - h = xgethostbyname(host); - if (h->h_addrtype != AF_INET) - error_msg_and_die("unknown address type; only AF_INET is currently supported."); +static void ping4(len_and_sockaddr *lsa) +{ + char packet[datalen + MAXIPLEN + MAXICMPLEN]; + int sockopt; - pingaddr.sin_family = AF_INET; /* h->h_addrtype */ - memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); - strncpy(buf, h->h_name, sizeof(buf) - 1); - hostname = buf; + pingsock = create_icmp_socket(); + pingaddr.sin = lsa->sin; + if (source_lsa) + xbind(pingsock, &lsa->sa, lsa->len); /* enable broadcast pings */ - sockopt = 1; - setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt, - sizeof(sockopt)); + setsockopt_broadcast(pingsock); /* set recv buf for broadcast pings */ - sockopt = 48 * 1024; - setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt, - sizeof(sockopt)); - - printf("PING %s (%s): %d data bytes\n", - hostname, - inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr), - datalen); + sockopt = 48 * 1024; /* explain why 48k? */ + setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt)); signal(SIGINT, pingstats); /* start the ping's going ... */ - sendping(0); + sendping4(0); /* listen for replies */ while (1) { @@ -478,65 +525,182 @@ static void ping(const char *host) socklen_t fromlen = (socklen_t) sizeof(from); int c; - if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, - (struct sockaddr *) &from, &fromlen)) < 0) { - if (errno == EINTR) - continue; - perror_msg("recvfrom"); + c = recvfrom(pingsock, packet, sizeof(packet), 0, + (struct sockaddr *) &from, &fromlen); + if (c < 0) { + if (errno != EINTR) + bb_perror_msg("recvfrom"); continue; } - unpack(packet, c, &from); + unpack4(packet, c, &from); if (pingcount > 0 && nreceived >= pingcount) break; } - pingstats(0); +} +#if ENABLE_PING6 +extern int BUG_bad_offsetof_icmp6_cksum(void); +static void ping6(len_and_sockaddr *lsa) +{ + char packet[datalen + MAXIPLEN + MAXICMPLEN]; + int sockopt; + struct msghdr msg; + struct sockaddr_in6 from; + struct iovec iov; + char control_buf[CMSG_SPACE(36)]; + + pingsock = create_icmp6_socket(); + pingaddr.sin6 = lsa->sin6; + /* untested whether "-I addr" really works for IPv6: */ + if (source_lsa) + xbind(pingsock, &lsa->sa, 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(ICMP6_FILTER)"); + } +#endif /*ICMP6_FILTER*/ + + /* enable broadcast pings */ + setsockopt_broadcast(pingsock); + + /* set recv buf for broadcast pings */ + sockopt = 48 * 1024; /* explain why 48k? */ + setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt)); + + sockopt = offsetof(struct icmp6_hdr, icmp6_cksum); + if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2) + BUG_bad_offsetof_icmp6_cksum(); + setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt)); + + /* request ttl info to be returned in ancillary data */ + setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1)); + + if (if_index) + pingaddr.sin6.sin6_scope_id = if_index; + + signal(SIGINT, pingstats); + + /* start the ping's going ... */ + sendping6(0); + + /* listen for replies */ + 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 = packet; + iov.iov_len = sizeof(packet); + 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_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); + } + } + unpack6(packet, c, &from, hoplimit); + if (pingcount > 0 && nreceived >= pingcount) + break; + } +} +#endif + +static void ping(len_and_sockaddr *lsa) +{ + printf("PING %s (%s)", hostname, dotted); + if (source_lsa) { + printf(" from %s", + xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len)); + } + printf(": %d data bytes\n", datalen); + +#if ENABLE_PING6 + if (lsa->sa.sa_family == AF_INET6) + ping6(lsa); + else +#endif + ping4(lsa); } -extern int ping_main(int argc, char **argv) +int ping_main(int argc, char **argv); +int ping_main(int argc, char **argv) { - char *thisarg; + len_and_sockaddr *lsa; + char *opt_c, *opt_s, *opt_I; + USE_PING6(sa_family_t af = AF_UNSPEC;) datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */ - argc--; - argv++; - options = 0; - /* Parse any options */ - while (argc >= 1 && **argv == '-') { - thisarg = *argv; - thisarg++; - switch (*thisarg) { - case 'q': - options |= O_QUIET; - break; - case 'c': - if (--argc <= 0) - show_usage(); - argv++; - pingcount = atoi(*argv); - break; - case 's': - if (--argc <= 0) - show_usage(); - argv++; - datalen = atoi(*argv); - break; - default: - show_usage(); + /* exactly one argument needed, -v and -q don't mix */ + opt_complementary = "=1:q--v:v--q"; + getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I); + if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c + if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s + if (option_mask32 & OPT_I) { // -I + if_index = if_nametoindex(opt_I); + if (!if_index) { + /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */ + /* (ping doesn't support source IPv6 addresses yet anyway) */ + source_lsa = xdotted2sockaddr(opt_I, 0); } - argc--; - argv++; } - if (argc < 1) - show_usage(); + myid = (int16_t) getpid(); + hostname = argv[optind]; +#if ENABLE_PING6 + if (option_mask32 & OPT_IPV4) + af = AF_INET; + if (option_mask32 & 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->sa.sa_family != lsa->sa.sa_family) + /* leaking it here... */ + source_lsa = NULL; - myid = getpid() & 0xFFFF; - ping(*argv); + dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len); + ping(lsa); + pingstats(0); return EXIT_SUCCESS; } -#endif /* ! BB_FEATURE_SIMPLE_PING */ +#endif /* FEATURE_FANCY_PING */ -/* + +#if ENABLE_PING6 +int ping6_main(int argc, char **argv); +int ping6_main(int argc, char **argv) +{ + argv[0] = (char*)"-6"; + return ping_main(argc + 1, argv - 1); +} +#endif + +/* from ping6.c: * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * @@ -552,8 +716,8 @@ extern int ping_main(int argc, char **argv) * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - * 3. + * 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