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485 lines
12 KiB
C
485 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* $Id: ping.c,v 1.11 2000/02/08 19:58:47 erik Exp $
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* Mini ping implementation for busybox
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*
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* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This version of ping is adapted from the ping in netkit-base 0.10,
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* which is:
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*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Muuss.
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*
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* Original copyright notice is retained at the end of this file.
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*/
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#include "internal.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/signal.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#define DEFDATALEN 56
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#define MAXIPLEN 60
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#define MAXICMPLEN 76
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#define MAXPACKET 65468
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#define MAX_DUP_CHK (8 * 128)
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#define MAXWAIT 10
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#define PINGINTERVAL 1 /* second */
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#define O_QUIET (1 << 0)
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#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
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#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
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#define SET(bit) (A(bit) |= B(bit))
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#define CLR(bit) (A(bit) &= (~B(bit)))
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#define TST(bit) (A(bit) & B(bit))
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/* common routines */
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static int in_cksum(unsigned short *buf, int sz)
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{
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int nleft = sz;
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int sum = 0;
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unsigned short *w = buf;
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unsigned short ans = 0;
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while (nleft > 1) {
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sum += *w++;
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nleft -= 2;
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}
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if (nleft == 1) {
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*(unsigned char *) (&ans) = *(unsigned char *) w;
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sum += ans;
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}
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sum = (sum >> 16) + (sum & 0xFFFF);
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sum += (sum >> 16);
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ans = ~sum;
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return (ans);
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}
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/* simple version */
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#ifdef BB_SIMPLE_PING
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static const char *ping_usage = "ping host\n\n";
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static char *hostname = NULL;
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static void noresp(int ign)
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{
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printf("No response from %s\n", hostname);
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exit(0);
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}
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static int ping(const char *host)
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{
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struct hostent *h;
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struct sockaddr_in pingaddr;
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struct icmp *pkt;
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int pingsock, c;
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char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
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if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) { /* 1 == ICMP */
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perror("ping");
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exit(1);
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}
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/* drop root privs if running setuid */
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setuid(getuid());
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memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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pingaddr.sin_family = AF_INET;
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if (!(h = gethostbyname(host))) {
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fprintf(stderr, "ping: unknown host %s\n", host);
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exit(1);
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}
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memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
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hostname = h->h_name;
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pkt = (struct icmp *) packet;
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memset(pkt, 0, sizeof(packet));
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pkt->icmp_type = ICMP_ECHO;
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pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
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c = sendto(pingsock, packet, sizeof(packet), 0,
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(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
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if (c < 0 || c != sizeof(packet)) {
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if (c < 0)
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perror("ping");
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fprintf(stderr, "ping: write incomplete\n");
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exit(1);
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}
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signal(SIGALRM, noresp);
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alarm(5); /* give the host 5000ms to respond */
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/* listen for replies */
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while (1) {
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struct sockaddr_in from;
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size_t fromlen = sizeof(from);
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if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
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(struct sockaddr *) &from, &fromlen)) < 0) {
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if (errno == EINTR)
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continue;
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perror("ping");
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continue;
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}
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if (c >= 76) { /* ip + icmp */
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struct iphdr *iphdr = (struct iphdr *) packet;
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pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
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if (pkt->icmp_type == ICMP_ECHOREPLY)
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break;
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}
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}
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printf("%s is alive!\n", hostname);
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return (TRUE);
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}
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extern int ping_main(int argc, char **argv)
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{
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argc--;
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argv++;
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if (argc < 1)
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usage(ping_usage);
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ping(*argv);
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exit(TRUE);
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}
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#else
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/* full(er) version */
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static const char *ping_usage = "ping [OPTION]... host\n\n"
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"Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
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"Options:\n"
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"\t-q\t\tQuiet mode, only displays output at start"
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"\t\t\tand when finished.\n" "\t-c COUNT\tSend only COUNT pings.\n";
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static char *hostname = NULL;
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static struct sockaddr_in pingaddr;
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static int pingsock = -1;
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static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
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static int myid = 0, options = 0;
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static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
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static char rcvd_tbl[MAX_DUP_CHK / 8];
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static void sendping(int);
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static void pingstats(int);
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static void unpack(char *, int, struct sockaddr_in *);
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static void ping(char *);
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/**************************************************************************/
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static void pingstats(int ign)
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{
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signal(SIGINT, SIG_IGN);
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printf("\n--- %s ping statistics ---\n", hostname);
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printf("%ld packets transmitted, ", ntransmitted);
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printf("%ld packets received, ", nreceived);
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if (nrepeats)
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printf("%ld duplicates, ", nrepeats);
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if (ntransmitted)
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printf("%ld%% packet loss\n",
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(ntransmitted - nreceived) * 100 / ntransmitted);
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if (nreceived)
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printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
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tmin / 10, tmin % 10,
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(tsum / (nreceived + nrepeats)) / 10,
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(tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
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exit(0);
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}
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static void sendping(int ign)
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{
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struct icmp *pkt;
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int i;
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char packet[DEFDATALEN + 8];
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pkt = (struct icmp *) packet;
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pkt->icmp_type = ICMP_ECHO;
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pkt->icmp_code = 0;
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pkt->icmp_cksum = 0;
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pkt->icmp_seq = ntransmitted++;
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pkt->icmp_id = myid;
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CLR(pkt->icmp_seq % MAX_DUP_CHK);
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gettimeofday((struct timeval *) &packet[8], NULL);
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pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
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i = sendto(pingsock, packet, sizeof(packet), 0,
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(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
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if (i < 0 || i != sizeof(packet)) {
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if (i < 0)
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perror("ping");
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fprintf(stderr, "ping wrote %d chars; %d expected\n", i,
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sizeof(packet));
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exit(1);
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}
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signal(SIGALRM, sendping);
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if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
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alarm(PINGINTERVAL);
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} else { /* done, wait for the last ping to come back */
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/* todo, don't necessarily need to wait so long... */
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signal(SIGALRM, pingstats);
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alarm(MAXWAIT);
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}
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}
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static void unpack(char *buf, int sz, struct sockaddr_in *from)
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{
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struct icmp *icmppkt;
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struct iphdr *iphdr;
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struct timeval tv, *tp;
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int hlen, dupflag;
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unsigned long triptime;
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gettimeofday(&tv, NULL);
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/* check IP header */
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iphdr = (struct iphdr *) buf;
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hlen = iphdr->ihl << 2;
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/* discard if too short */
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if (sz < (DEFDATALEN + ICMP_MINLEN))
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return;
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sz -= hlen;
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icmppkt = (struct icmp *) (buf + hlen);
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if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
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if (icmppkt->icmp_id != myid)
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return; /* not our ping */
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++nreceived;
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tp = (struct timeval *) icmppkt->icmp_data;
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if ((tv.tv_usec -= tp->tv_usec) < 0) {
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--tv.tv_sec;
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tv.tv_usec += 1000000;
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}
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tv.tv_sec -= tp->tv_sec;
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triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
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tsum += triptime;
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if (triptime < tmin)
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tmin = triptime;
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if (triptime > tmax)
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tmax = triptime;
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if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
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++nrepeats;
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--nreceived;
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dupflag = 1;
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} else {
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SET(icmppkt->icmp_seq % MAX_DUP_CHK);
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dupflag = 0;
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}
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if (options & O_QUIET)
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return;
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printf("%d bytes from %s: icmp_seq=%u", sz,
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inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
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icmppkt->icmp_seq);
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printf(" ttl=%d", iphdr->ttl);
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printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
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if (dupflag)
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printf(" (DUP!)");
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printf("\n");
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} else {
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fprintf(stderr,
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"Warning: unknown ICMP packet received (not echo-reply)\n");
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}
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}
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static void ping(char *host)
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{
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struct protoent *proto;
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struct hostent *h;
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char buf[MAXHOSTNAMELEN];
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char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
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int sockopt;
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proto = getprotobyname("icmp");
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/* if getprotobyname failed, just silently force
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* proto->p_proto to have the correct value for "icmp" */
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if ((pingsock = socket(AF_INET, SOCK_RAW,
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(proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
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if (errno == EPERM) {
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fprintf(stderr, "ping: permission denied. (are you root?)\n");
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} else {
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perror("ping");
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}
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exit(1);
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}
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/* drop root privs if running setuid */
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setuid(getuid());
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memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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pingaddr.sin_family = AF_INET;
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if (!(h = gethostbyname(host))) {
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fprintf(stderr, "ping: unknown host %s\n", host);
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exit(1);
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}
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if (h->h_addrtype != AF_INET) {
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fprintf(stderr,
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"ping: unknown address type; only AF_INET is currently supported.\n");
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exit(1);
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}
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pingaddr.sin_family = AF_INET; /* h->h_addrtype */
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memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
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strncpy(buf, h->h_name, sizeof(buf) - 1);
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hostname = buf;
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/* enable broadcast pings */
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sockopt = 1;
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setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
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sizeof(sockopt));
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/* set recv buf for broadcast pings */
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sockopt = 48 * 1024;
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setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
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sizeof(sockopt));
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printf("PING %s (%s): %d data bytes\n",
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hostname,
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inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
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DEFDATALEN);
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signal(SIGINT, pingstats);
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/* start the ping's going ... */
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sendping(0);
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/* listen for replies */
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while (1) {
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struct sockaddr_in from;
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size_t fromlen = sizeof(from);
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int c;
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if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
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(struct sockaddr *) &from, &fromlen)) < 0) {
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if (errno == EINTR)
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continue;
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perror("ping");
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continue;
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}
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unpack(packet, c, &from);
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if (pingcount > 0 && nreceived >= pingcount)
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break;
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}
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pingstats(0);
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}
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extern int ping_main(int argc, char **argv)
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{
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char *thisarg;
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argc--;
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argv++;
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options = 0;
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/* Parse any options */
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while (argc > 1) {
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if (**argv != '-')
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usage(ping_usage);
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thisarg = *argv;
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thisarg++;
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switch (*thisarg) {
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case 'q':
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options |= O_QUIET;
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break;
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case 'c':
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argc--;
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argv++;
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pingcount = atoi(*argv);
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break;
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default:
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usage(ping_usage);
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}
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argc--;
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argv++;
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}
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if (argc < 1)
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usage(ping_usage);
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myid = getpid() & 0xFFFF;
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ping(*argv);
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exit(TRUE);
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}
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#endif
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Muuss.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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