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427 lines
10 KiB
C
427 lines
10 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* $Id: ping.c,v 1.56 2004/03/15 08:28:48 andersen 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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* Adapted from the ping in netkit-base 0.10:
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* Copyright (c) 1989 The Regents of the University of California.
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* Derived from software contributed to Berkeley by Mike Muuss.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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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/times.h>
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#include <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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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include "busybox.h"
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enum {
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DEFDATALEN = 56,
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MAXIPLEN = 60,
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MAXICMPLEN = 76,
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MAXPACKET = 65468,
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MAX_DUP_CHK = (8 * 128),
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MAXWAIT = 10,
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PINGINTERVAL = 1 /* second */
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};
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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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static void ping(const char *host);
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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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#ifndef CONFIG_FEATURE_FANCY_PING
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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(EXIT_FAILURE);
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}
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static void 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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pingsock = create_icmp_socket();
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memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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pingaddr.sin_family = AF_INET;
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h = xgethostbyname(host);
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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, DEFDATALEN + ICMP_MINLEN, 0,
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(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
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if (c < 0) {
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if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
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bb_perror_msg_and_die("sendto");
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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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socklen_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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bb_perror_msg("recvfrom");
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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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if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
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printf("%s is alive!\n", hostname);
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return;
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}
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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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bb_show_usage();
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ping(*argv);
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return EXIT_SUCCESS;
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}
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#else /* ! CONFIG_FEATURE_FANCY_PING */
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/* full(er) version */
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static struct sockaddr_in pingaddr;
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static int pingsock = -1;
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static int datalen; /* intentionally uninitialized to work around gcc bug */
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static long ntransmitted, nreceived, nrepeats, pingcount;
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static int myid, options;
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static unsigned long tmin = ULONG_MAX, tmax, tsum;
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static char rcvd_tbl[MAX_DUP_CHK / 8];
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#ifndef CONFIG_FEATURE_FANCY_PING6
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static
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#endif
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struct hostent *hostent;
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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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/**************************************************************************/
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static void pingstats(int junk)
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{
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int status;
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signal(SIGINT, SIG_IGN);
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printf("\n--- %s ping statistics ---\n", hostent->h_name);
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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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if (nreceived != 0)
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status = EXIT_SUCCESS;
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else
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status = EXIT_FAILURE;
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exit(status);
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}
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static void sendping(int junk)
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{
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struct icmp *pkt;
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int i;
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char packet[datalen + ICMP_MINLEN];
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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 = htons(ntransmitted++);
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pkt->icmp_id = myid;
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CLR(ntohs(pkt->icmp_seq) % MAX_DUP_CHK);
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gettimeofday((struct timeval *) &pkt->icmp_dun, 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)
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bb_perror_msg_and_die("sendto");
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else if ((size_t)i != sizeof(packet))
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bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
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(int)sizeof(packet));
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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 char *icmp_type_name (int id)
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{
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switch (id) {
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case ICMP_ECHOREPLY: return "Echo Reply";
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case ICMP_DEST_UNREACH: return "Destination Unreachable";
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case ICMP_SOURCE_QUENCH: return "Source Quench";
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case ICMP_REDIRECT: return "Redirect (change route)";
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case ICMP_ECHO: return "Echo Request";
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case ICMP_TIME_EXCEEDED: return "Time Exceeded";
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case ICMP_PARAMETERPROB: return "Parameter Problem";
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case ICMP_TIMESTAMP: return "Timestamp Request";
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case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
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case ICMP_INFO_REQUEST: return "Information Request";
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case ICMP_INFO_REPLY: return "Information Reply";
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case ICMP_ADDRESS: return "Address Mask Request";
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case ICMP_ADDRESSREPLY: return "Address Mask Reply";
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default: return "unknown ICMP type";
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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 < (datalen + 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_id != myid)
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return; /* not our ping */
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if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
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u_int16_t recv_seq = ntohs(icmppkt->icmp_seq);
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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(recv_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(recv_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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recv_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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if (icmppkt->icmp_type != ICMP_ECHO)
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bb_error_msg("Warning: Got ICMP %d (%s)",
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icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type));
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fflush(stdout);
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}
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static void ping(const char *host)
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{
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char packet[datalen + MAXIPLEN + MAXICMPLEN];
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int sockopt;
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pingsock = create_icmp_socket();
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memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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pingaddr.sin_family = AF_INET;
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hostent = xgethostbyname(host);
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if (hostent->h_addrtype != AF_INET)
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bb_error_msg_and_die("unknown address type; only AF_INET is currently supported.");
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memcpy(&pingaddr.sin_addr, hostent->h_addr, sizeof(pingaddr.sin_addr));
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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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hostent->h_name,
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inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
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datalen);
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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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socklen_t fromlen = (socklen_t) 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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bb_perror_msg("recvfrom");
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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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int ping_main(int argc, char **argv)
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{
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char *thisarg;
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datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
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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 && **argv == '-') {
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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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if (--argc <= 0)
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bb_show_usage();
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argv++;
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pingcount = atoi(*argv);
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break;
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case 's':
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if (--argc <= 0)
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bb_show_usage();
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argv++;
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datalen = atoi(*argv);
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break;
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default:
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bb_show_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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bb_show_usage();
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myid = getpid() & 0xFFFF;
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ping(*argv);
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return EXIT_SUCCESS;
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}
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#endif /* ! CONFIG_FEATURE_FANCY_PING */
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