/* vi: set sw=4 ts=4: */ /* * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * 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 "busybox.h" /* 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 enum { DEFDATALEN = 56, MAXIPLEN = 60, MAXICMPLEN = 76, MAXPACKET = 65468, MAX_DUP_CHK = (8 * 128), MAXWAIT = 10, PINGINTERVAL = 1 /* second */ }; static const char *hostname; static void ping(const char *host); #ifndef CONFIG_FEATURE_FANCY_PING6 /* simple version */ static void noresp(int ign) { printf("No response from %s\n", hostname); exit(EXIT_FAILURE); } static void ping(const char *host) { len_and_sockaddr *lsa; struct sockaddr_in6 pingaddr; struct icmp6_hdr *pkt; int pingsock, c; int sockopt; char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; hostname = host; pingsock = create_icmp6_socket(); lsa = host_and_af2sockaddr(host, 0, AF_INET6); 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 = sendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6)); if (c < 0) { if (ENABLE_FEATURE_CLEAN_UP) close(pingsock); bb_perror_msg_and_die("sendto"); } signal(SIGALRM, noresp); alarm(5); /* give the host 5000ms to respond */ /* 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); printf("%s is alive!\n", hostname); } int ping6_main(int argc, char **argv) { argc--; argv++; if (argc < 1) bb_show_usage(); ping(*argv); return EXIT_SUCCESS; } #else /* ! CONFIG_FEATURE_FANCY_PING6 */ /* full(er) version */ #define OPT_STRING "qvc:s:I:" enum { OPT_QUIET = 1 << 0, OPT_VERBOSE = 1 << 1, }; static struct sockaddr_in6 pingaddr; static int pingsock = -1; static unsigned datalen; /* intentionally uninitialized to work around gcc bug */ static int if_index; static unsigned long ntransmitted, nreceived, nrepeats, pingcount; static int myid; static unsigned long tmin = ULONG_MAX, tmax, tsum; static char rcvd_tbl[MAX_DUP_CHK / 8]; static char *hostname; static void sendping(int); static void pingstats(int); static void unpack(char *, int, struct sockaddr_in6 *, int); #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) { int status; signal(SIGINT, SIG_IGN); printf("\n--- %s ping statistics ---\n", hostname); printf("%lu packets transmitted, ", ntransmitted); printf("%lu packets received, ", nreceived); if (nrepeats) printf("%lu duplicates, ", nrepeats); if (ntransmitted) printf("%lu%% 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); } static void sendping(int junk) { struct icmp6_hdr *pkt; int i; char packet[datalen + sizeof (struct icmp6_hdr)]; pkt = (struct icmp6_hdr *) packet; 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; CLR((uint16_t)ntransmitted % MAX_DUP_CHK); ntransmitted++; gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL); i = sendto(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6)); if (i < 0) bb_perror_msg_and_die("sendto"); if ((size_t)i != sizeof(packet)) bb_error_msg_and_die("ping wrote %d chars; %d expected", i, (int)sizeof(packet)); 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); } } /* 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 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"; } } static void unpack(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit) { struct icmp6_hdr *icmppkt; struct timeval tv, *tp; int dupflag; unsigned long triptime; char buf[INET6_ADDRSTRLEN]; gettimeofday(&tv, NULL); /* discard if too short */ if (sz < (datalen + sizeof(struct icmp6_hdr))) return; 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); ++nreceived; tp = (struct timeval *) &icmppkt->icmp6_data8[4]; if ((tv.tv_usec -= tp->tv_usec) < 0) { --tv.tv_sec; tv.tv_usec += 1000000; } tv.tv_sec -= tp->tv_sec; triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100); tsum += triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) tmax = triptime; if (TST(recv_seq % MAX_DUP_CHK)) { ++nrepeats; --nreceived; dupflag = 1; } else { SET(recv_seq % MAX_DUP_CHK); dupflag = 0; } if (option_mask32 & OPT_QUIET) return; printf("%d bytes from %s: icmp6_seq=%u", sz, inet_ntop(AF_INET6, &pingaddr.sin6_addr, buf, sizeof(buf)), recv_seq); printf(" ttl=%d time=%lu.%lu ms", hoplimit, triptime / 10, triptime % 10); if (dupflag) printf(" (DUP!)"); puts(""); } 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)); } fflush(stdout); } extern int BUG_bad_offsetof_icmp6_cksum(void); static void ping(const char *host) { len_and_sockaddr *lsa; char packet[datalen + MAXIPLEN + MAXICMPLEN]; char buf[INET6_ADDRSTRLEN]; int sockopt; struct msghdr msg; struct sockaddr_in6 from; struct iovec iov; char control_buf[CMSG_SPACE(36)]; pingsock = create_icmp6_socket(); lsa = host_and_af2sockaddr(host, 0, AF_INET6); hostname = xmalloc_sockaddr2host_noport(&lsa->sa, lsa->len); pingaddr = lsa->sin6; #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_scope_id = if_index; printf("PING %s (%s): %d data bytes\n", hostname, inet_ntop(AF_INET6, &pingaddr.sin6_addr, buf, sizeof(buf)), datalen); signal(SIGINT, pingstats); /* start the ping's going ... */ sendping(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); } } unpack(packet, c, &from, hoplimit); if (pingcount > 0 && nreceived >= pingcount) break; } pingstats(0); } int ping6_main(int argc, char **argv) { char *opt_c, *opt_s, *opt_I; datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */ /* 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 & 4) pingcount = xatoul(opt_c); // -c if (option_mask32 & 8) datalen = xatou16(opt_s); // -s if (option_mask32 & 0x10) { // -I if_index = if_nametoindex(opt_I); if (!if_index) bb_error_msg_and_die( "%s: invalid interface name", opt_I); } myid = (int16_t) getpid(); ping(argv[optind]); return EXIT_SUCCESS; } #endif /* ! CONFIG_FEATURE_FANCY_PING6 */ /* * 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. */