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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