/* vi: set sw=4 ts=4: */ /* * $Id: ping.c,v 1.38 2001/02/20 06:14:08 andersen Exp $ * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> * * 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. * * 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. * * 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 * * 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. */ #include <sys/param.h> #include <sys/socket.h> #include <sys/file.h> #include <sys/time.h> #include <sys/times.h> #include <sys/signal.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #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 ! defined __GLIBC__ && ! defined __UCLIBC__ typedef unsigned int socklen_t; 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 }; #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); /* common routines */ static int in_cksum(unsigned short *buf, int sz) { int nleft = sz; int sum = 0; unsigned short *w = buf; unsigned short ans = 0; while (nleft > 1) { sum += *w++; nleft -= 2; } if (nleft == 1) { *(unsigned char *) (&ans) = *(unsigned char *) w; sum += ans; } sum = (sum >> 16) + (sum & 0xFFFF); sum += (sum >> 16); ans = ~sum; return (ans); } /* simple version */ #ifdef BB_FEATURE_SIMPLE_PING static char *hostname = NULL; static void noresp(int ign) { printf("No response from %s\n", hostname); exit(0); } static void ping(const char *host) { 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; if (!(h = gethostbyname(host))) { error_msg("unknown host %s", host); exit(1); } memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); hostname = h->h_name; 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)); 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); if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &from, &fromlen)) < 0) { if (errno == EINTR) continue; perror_msg("recvfrom"); continue; } if (c >= 76) { /* ip + icmp */ struct iphdr *iphdr = (struct iphdr *) packet; pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */ if (pkt->icmp_type == ICMP_ECHOREPLY) break; } } printf("%s is alive!\n", hostname); return; } extern int ping_main(int argc, char **argv) { argc--; argv++; if (argc < 1) show_usage(); ping(*argv); return EXIT_SUCCESS; } #else /* ! BB_FEATURE_SIMPLE_PING */ /* full(er) version */ static char *hostname = NULL; static struct sockaddr_in pingaddr; static int pingsock = -1; static int 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 char rcvd_tbl[MAX_DUP_CHK / 8]; static void sendping(int); static void pingstats(int); static void unpack(char *, int, struct sockaddr_in *); /**************************************************************************/ static void pingstats(int junk) { int status; signal(SIGINT, SIG_IGN); printf("\n--- %s ping statistics ---\n", hostname); printf("%ld packets transmitted, ", ntransmitted); printf("%ld packets received, ", nreceived); if (nrepeats) printf("%ld 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); } static void sendping(int junk) { struct icmp *pkt; int i; char packet[datalen + 8]; pkt = (struct icmp *) packet; pkt->icmp_type = ICMP_ECHO; pkt->icmp_code = 0; pkt->icmp_cksum = 0; pkt->icmp_seq = ntransmitted++; pkt->icmp_id = myid; CLR(pkt->icmp_seq % MAX_DUP_CHK); gettimeofday((struct timeval *) &packet[8], NULL); pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); i = sendto(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); 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)); 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 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 void unpack(char *buf, int sz, struct sockaddr_in *from) { 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); if (icmppkt->icmp_id != myid) return; /* not our ping */ if (icmppkt->icmp_type == ICMP_ECHOREPLY) { ++nreceived; tp = (struct timeval *) icmppkt->icmp_data; 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(icmppkt->icmp_seq % MAX_DUP_CHK)) { ++nrepeats; --nreceived; dupflag = 1; } else { SET(icmppkt->icmp_seq % MAX_DUP_CHK); dupflag = 0; } 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)); } static void ping(const char *host) { struct protoent *proto; struct hostent *h; char buf[MAXHOSTNAMELEN]; char packet[datalen + MAXIPLEN + MAXICMPLEN]; int sockopt; 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"); } /* drop root privs if running setuid */ setuid(getuid()); memset(&pingaddr, 0, sizeof(struct sockaddr_in)); pingaddr.sin_family = AF_INET; if (!(h = gethostbyname(host))) { error_msg("unknown host %s", host); exit(1); } if (h->h_addrtype != AF_INET) { error_msg("unknown address type; only AF_INET is currently supported."); exit(1); } 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; /* enable broadcast pings */ sockopt = 1; setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt, sizeof(sockopt)); /* 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); signal(SIGINT, pingstats); /* start the ping's going ... */ sendping(0); /* listen for replies */ while (1) { struct sockaddr_in from; 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"); continue; } unpack(packet, c, &from); if (pingcount > 0 && nreceived >= pingcount) break; } pingstats(0); } extern int ping_main(int argc, char **argv) { char *thisarg; 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(); } argc--; argv++; } if (argc < 1) show_usage(); myid = getpid() & 0xFFFF; ping(*argv); return EXIT_SUCCESS; } #endif /* ! BB_FEATURE_SIMPLE_PING */ /* * 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> * * 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. */