[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * $Id: ping.c,v 1.56 2004/03/15 08:28:48 andersen Exp $
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| 4 | * Mini ping implementation for busybox
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| 5 | *
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| 6 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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| 7 | *
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| 8 | * Adapted from the ping in netkit-base 0.10:
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| 9 | * Copyright (c) 1989 The Regents of the University of California.
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| 10 | * Derived from software contributed to Berkeley by Mike Muuss.
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 13 | */
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| 14 |
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| 15 | #include <sys/param.h>
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| 16 | #include <sys/socket.h>
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| 17 | #include <sys/file.h>
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| 18 | #include <sys/times.h>
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| 19 | #include <signal.h>
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| 20 |
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| 21 | #include <netinet/in.h>
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| 22 | #include <netinet/ip.h>
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| 23 | #include <netinet/ip_icmp.h>
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| 24 | #include <arpa/inet.h>
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| 25 | #include <netdb.h>
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| 26 | #include <stdio.h>
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| 27 | #include <stdlib.h>
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| 28 | #include <errno.h>
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| 29 | #include <unistd.h>
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| 30 | #include <string.h>
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| 31 | #include <stdlib.h>
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| 32 | #include "busybox.h"
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| 33 |
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| 34 |
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| 35 | enum {
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| 36 | DEFDATALEN = 56,
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| 37 | MAXIPLEN = 60,
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| 38 | MAXICMPLEN = 76,
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| 39 | MAXPACKET = 65468,
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| 40 | MAX_DUP_CHK = (8 * 128),
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| 41 | MAXWAIT = 10,
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| 42 | PINGINTERVAL = 1 /* second */
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| 43 | };
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| 44 |
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| 45 | #define O_QUIET (1 << 0)
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| 46 |
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| 47 | #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
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| 48 | #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
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| 49 | #define SET(bit) (A(bit) |= B(bit))
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| 50 | #define CLR(bit) (A(bit) &= (~B(bit)))
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| 51 | #define TST(bit) (A(bit) & B(bit))
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| 52 |
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| 53 | static void ping(const char *host);
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| 54 |
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| 55 | /* common routines */
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| 56 | static int in_cksum(unsigned short *buf, int sz)
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| 57 | {
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| 58 | int nleft = sz;
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| 59 | int sum = 0;
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| 60 | unsigned short *w = buf;
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| 61 | unsigned short ans = 0;
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| 62 |
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| 63 | while (nleft > 1) {
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| 64 | sum += *w++;
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| 65 | nleft -= 2;
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| 66 | }
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| 67 |
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| 68 | if (nleft == 1) {
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| 69 | *(unsigned char *) (&ans) = *(unsigned char *) w;
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| 70 | sum += ans;
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| 71 | }
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| 72 |
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| 73 | sum = (sum >> 16) + (sum & 0xFFFF);
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| 74 | sum += (sum >> 16);
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| 75 | ans = ~sum;
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| 76 | return (ans);
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| 77 | }
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| 78 |
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| 79 | /* simple version */
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| 80 | #ifndef CONFIG_FEATURE_FANCY_PING
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| 81 | static char *hostname = NULL;
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| 82 | static void noresp(int ign)
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| 83 | {
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| 84 | printf("No response from %s\n", hostname);
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| 85 | exit(EXIT_FAILURE);
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| 86 | }
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| 87 |
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| 88 | static void ping(const char *host)
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| 89 | {
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| 90 | struct hostent *h;
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| 91 | struct sockaddr_in pingaddr;
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| 92 | struct icmp *pkt;
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| 93 | int pingsock, c;
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| 94 | char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
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| 95 |
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| 96 | pingsock = create_icmp_socket();
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| 97 |
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| 98 | memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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| 99 |
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| 100 | pingaddr.sin_family = AF_INET;
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| 101 | h = xgethostbyname(host);
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| 102 | memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
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| 103 | hostname = h->h_name;
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| 104 |
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| 105 | pkt = (struct icmp *) packet;
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| 106 | memset(pkt, 0, sizeof(packet));
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| 107 | pkt->icmp_type = ICMP_ECHO;
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| 108 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
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| 109 |
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| 110 | c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0,
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| 111 | (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
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| 112 |
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| 113 | if (c < 0) {
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| 114 | if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
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| 115 | bb_perror_msg_and_die("sendto");
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| 116 | }
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| 117 |
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| 118 | signal(SIGALRM, noresp);
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| 119 | alarm(5); /* give the host 5000ms to respond */
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| 120 | /* listen for replies */
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| 121 | while (1) {
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| 122 | struct sockaddr_in from;
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| 123 | socklen_t fromlen = sizeof(from);
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| 124 |
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| 125 | if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
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| 126 | (struct sockaddr *) &from, &fromlen)) < 0) {
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| 127 | if (errno == EINTR)
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| 128 | continue;
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| 129 | bb_perror_msg("recvfrom");
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| 130 | continue;
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| 131 | }
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| 132 | if (c >= 76) { /* ip + icmp */
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| 133 | struct iphdr *iphdr = (struct iphdr *) packet;
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| 134 |
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| 135 | pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
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| 136 | if (pkt->icmp_type == ICMP_ECHOREPLY)
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| 137 | break;
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| 138 | }
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| 139 | }
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| 140 | if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
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| 141 | printf("%s is alive!\n", hostname);
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| 142 | return;
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| 143 | }
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| 144 |
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| 145 | int ping_main(int argc, char **argv)
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| 146 | {
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| 147 | argc--;
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| 148 | argv++;
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| 149 | if (argc < 1)
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| 150 | bb_show_usage();
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| 151 | ping(*argv);
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| 152 | return EXIT_SUCCESS;
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| 153 | }
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| 154 |
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| 155 | #else /* ! CONFIG_FEATURE_FANCY_PING */
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| 156 | /* full(er) version */
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| 157 | static struct sockaddr_in pingaddr;
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| 158 | static int pingsock = -1;
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| 159 | static int datalen; /* intentionally uninitialized to work around gcc bug */
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| 160 |
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| 161 | static long ntransmitted, nreceived, nrepeats, pingcount;
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| 162 | static int myid, options;
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| 163 | static unsigned long tmin = ULONG_MAX, tmax, tsum;
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| 164 | static char rcvd_tbl[MAX_DUP_CHK / 8];
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| 165 |
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| 166 | #ifndef CONFIG_FEATURE_FANCY_PING6
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| 167 | static
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| 168 | #endif
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| 169 | struct hostent *hostent;
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| 170 |
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| 171 | static void sendping(int);
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| 172 | static void pingstats(int);
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| 173 | static void unpack(char *, int, struct sockaddr_in *);
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| 174 |
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| 175 | /**************************************************************************/
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| 176 |
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| 177 | static void pingstats(int junk)
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| 178 | {
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| 179 | int status;
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| 180 |
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| 181 | signal(SIGINT, SIG_IGN);
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| 182 |
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| 183 | printf("\n--- %s ping statistics ---\n", hostent->h_name);
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| 184 | printf("%ld packets transmitted, ", ntransmitted);
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| 185 | printf("%ld packets received, ", nreceived);
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| 186 | if (nrepeats)
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| 187 | printf("%ld duplicates, ", nrepeats);
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| 188 | if (ntransmitted)
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| 189 | printf("%ld%% packet loss\n",
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| 190 | (ntransmitted - nreceived) * 100 / ntransmitted);
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| 191 | if (nreceived)
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| 192 | printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
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| 193 | tmin / 10, tmin % 10,
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| 194 | (tsum / (nreceived + nrepeats)) / 10,
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| 195 | (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
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| 196 | if (nreceived != 0)
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| 197 | status = EXIT_SUCCESS;
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| 198 | else
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| 199 | status = EXIT_FAILURE;
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| 200 | exit(status);
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| 201 | }
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| 202 |
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| 203 | static void sendping(int junk)
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| 204 | {
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| 205 | struct icmp *pkt;
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| 206 | int i;
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| 207 | char packet[datalen + ICMP_MINLEN];
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| 208 |
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| 209 | pkt = (struct icmp *) packet;
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| 210 |
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| 211 | pkt->icmp_type = ICMP_ECHO;
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| 212 | pkt->icmp_code = 0;
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| 213 | pkt->icmp_cksum = 0;
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| 214 | pkt->icmp_seq = htons(ntransmitted++);
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| 215 | pkt->icmp_id = myid;
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| 216 | CLR(ntohs(pkt->icmp_seq) % MAX_DUP_CHK);
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| 217 |
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| 218 | gettimeofday((struct timeval *) &pkt->icmp_dun, NULL);
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| 219 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
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| 220 |
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| 221 | i = sendto(pingsock, packet, sizeof(packet), 0,
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| 222 | (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
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| 223 |
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| 224 | if (i < 0)
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| 225 | bb_perror_msg_and_die("sendto");
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| 226 | else if ((size_t)i != sizeof(packet))
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| 227 | bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
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| 228 | (int)sizeof(packet));
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| 229 |
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| 230 | signal(SIGALRM, sendping);
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| 231 | if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
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| 232 | alarm(PINGINTERVAL);
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| 233 | } else { /* done, wait for the last ping to come back */
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| 234 | /* todo, don't necessarily need to wait so long... */
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| 235 | signal(SIGALRM, pingstats);
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| 236 | alarm(MAXWAIT);
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| 237 | }
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| 238 | }
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| 239 |
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| 240 | static char *icmp_type_name (int id)
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| 241 | {
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| 242 | switch (id) {
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| 243 | case ICMP_ECHOREPLY: return "Echo Reply";
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| 244 | case ICMP_DEST_UNREACH: return "Destination Unreachable";
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| 245 | case ICMP_SOURCE_QUENCH: return "Source Quench";
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| 246 | case ICMP_REDIRECT: return "Redirect (change route)";
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| 247 | case ICMP_ECHO: return "Echo Request";
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| 248 | case ICMP_TIME_EXCEEDED: return "Time Exceeded";
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| 249 | case ICMP_PARAMETERPROB: return "Parameter Problem";
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| 250 | case ICMP_TIMESTAMP: return "Timestamp Request";
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| 251 | case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
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| 252 | case ICMP_INFO_REQUEST: return "Information Request";
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| 253 | case ICMP_INFO_REPLY: return "Information Reply";
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| 254 | case ICMP_ADDRESS: return "Address Mask Request";
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| 255 | case ICMP_ADDRESSREPLY: return "Address Mask Reply";
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| 256 | default: return "unknown ICMP type";
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| 257 | }
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| 258 | }
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| 259 |
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| 260 | static void unpack(char *buf, int sz, struct sockaddr_in *from)
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| 261 | {
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| 262 | struct icmp *icmppkt;
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| 263 | struct iphdr *iphdr;
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| 264 | struct timeval tv, *tp;
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| 265 | int hlen, dupflag;
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| 266 | unsigned long triptime;
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| 267 |
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| 268 | gettimeofday(&tv, NULL);
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| 269 |
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| 270 | /* check IP header */
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| 271 | iphdr = (struct iphdr *) buf;
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| 272 | hlen = iphdr->ihl << 2;
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| 273 | /* discard if too short */
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| 274 | if (sz < (datalen + ICMP_MINLEN))
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| 275 | return;
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| 276 |
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| 277 | sz -= hlen;
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| 278 | icmppkt = (struct icmp *) (buf + hlen);
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| 279 |
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| 280 | if (icmppkt->icmp_id != myid)
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| 281 | return; /* not our ping */
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| 282 |
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| 283 | if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
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| 284 | u_int16_t recv_seq = ntohs(icmppkt->icmp_seq);
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| 285 | ++nreceived;
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| 286 | tp = (struct timeval *) icmppkt->icmp_data;
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| 287 |
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| 288 | if ((tv.tv_usec -= tp->tv_usec) < 0) {
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| 289 | --tv.tv_sec;
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| 290 | tv.tv_usec += 1000000;
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| 291 | }
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| 292 | tv.tv_sec -= tp->tv_sec;
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| 293 |
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| 294 | triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
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| 295 | tsum += triptime;
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| 296 | if (triptime < tmin)
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| 297 | tmin = triptime;
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| 298 | if (triptime > tmax)
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| 299 | tmax = triptime;
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| 300 |
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| 301 | if (TST(recv_seq % MAX_DUP_CHK)) {
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| 302 | ++nrepeats;
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| 303 | --nreceived;
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| 304 | dupflag = 1;
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| 305 | } else {
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| 306 | SET(recv_seq % MAX_DUP_CHK);
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| 307 | dupflag = 0;
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| 308 | }
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| 309 |
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| 310 | if (options & O_QUIET)
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| 311 | return;
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| 312 |
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| 313 | printf("%d bytes from %s: icmp_seq=%u", sz,
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| 314 | inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
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| 315 | recv_seq);
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| 316 | printf(" ttl=%d", iphdr->ttl);
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| 317 | printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
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| 318 | if (dupflag)
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| 319 | printf(" (DUP!)");
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| 320 | printf("\n");
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| 321 | } else
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| 322 | if (icmppkt->icmp_type != ICMP_ECHO)
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| 323 | bb_error_msg("Warning: Got ICMP %d (%s)",
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| 324 | icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type));
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| 325 | fflush(stdout);
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| 326 | }
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| 327 |
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| 328 | static void ping(const char *host)
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| 329 | {
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| 330 | char packet[datalen + MAXIPLEN + MAXICMPLEN];
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| 331 | int sockopt;
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| 332 |
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| 333 | pingsock = create_icmp_socket();
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| 334 |
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| 335 | memset(&pingaddr, 0, sizeof(struct sockaddr_in));
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| 336 |
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| 337 | pingaddr.sin_family = AF_INET;
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| 338 | hostent = xgethostbyname(host);
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| 339 | if (hostent->h_addrtype != AF_INET)
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| 340 | bb_error_msg_and_die("unknown address type; only AF_INET is currently supported.");
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| 341 |
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| 342 | memcpy(&pingaddr.sin_addr, hostent->h_addr, sizeof(pingaddr.sin_addr));
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| 343 |
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| 344 | /* enable broadcast pings */
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| 345 | sockopt = 1;
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| 346 | setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
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| 347 | sizeof(sockopt));
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| 348 |
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| 349 | /* set recv buf for broadcast pings */
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| 350 | sockopt = 48 * 1024;
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| 351 | setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
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| 352 | sizeof(sockopt));
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| 353 |
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| 354 | printf("PING %s (%s): %d data bytes\n",
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| 355 | hostent->h_name,
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| 356 | inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
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| 357 | datalen);
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| 358 |
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| 359 | signal(SIGINT, pingstats);
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| 360 |
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| 361 | /* start the ping's going ... */
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| 362 | sendping(0);
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| 363 |
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| 364 | /* listen for replies */
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| 365 | while (1) {
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| 366 | struct sockaddr_in from;
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| 367 | socklen_t fromlen = (socklen_t) sizeof(from);
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| 368 | int c;
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| 369 |
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| 370 | if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
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| 371 | (struct sockaddr *) &from, &fromlen)) < 0) {
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| 372 | if (errno == EINTR)
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| 373 | continue;
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| 374 | bb_perror_msg("recvfrom");
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| 375 | continue;
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| 376 | }
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| 377 | unpack(packet, c, &from);
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| 378 | if (pingcount > 0 && nreceived >= pingcount)
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| 379 | break;
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| 380 | }
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| 381 | pingstats(0);
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| 382 | }
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| 383 |
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| 384 | int ping_main(int argc, char **argv)
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| 385 | {
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| 386 | char *thisarg;
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| 387 |
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| 388 | datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
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| 389 |
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| 390 | argc--;
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| 391 | argv++;
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| 392 | options = 0;
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| 393 | /* Parse any options */
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| 394 | while (argc >= 1 && **argv == '-') {
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| 395 | thisarg = *argv;
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| 396 | thisarg++;
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| 397 | switch (*thisarg) {
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| 398 | case 'q':
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| 399 | options |= O_QUIET;
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| 400 | break;
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| 401 | case 'c':
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| 402 | if (--argc <= 0)
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| 403 | bb_show_usage();
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| 404 | argv++;
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| 405 | pingcount = atoi(*argv);
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| 406 | break;
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| 407 | case 's':
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| 408 | if (--argc <= 0)
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| 409 | bb_show_usage();
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| 410 | argv++;
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| 411 | datalen = atoi(*argv);
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| 412 | break;
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| 413 | default:
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| 414 | bb_show_usage();
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| 415 | }
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| 416 | argc--;
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| 417 | argv++;
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| 418 | }
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| 419 | if (argc < 1)
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| 420 | bb_show_usage();
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| 421 |
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| 422 | myid = getpid() & 0xFFFF;
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| 423 | ping(*argv);
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| 424 | return EXIT_SUCCESS;
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| 425 | }
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| 426 | #endif /* ! CONFIG_FEATURE_FANCY_PING */
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