1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini ping implementation for busybox
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4 | *
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5 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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6 | *
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7 | * Adapted from the ping in netkit-base 0.10:
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8 | * Copyright (c) 1989 The Regents of the University of California.
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9 | * All rights reserved.
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10 | *
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11 | * This code is derived from software contributed to Berkeley by
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12 | * Mike Muuss.
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13 | *
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14 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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15 | */
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16 | /* from ping6.c:
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17 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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18 | *
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19 | * This version of ping is adapted from the ping in netkit-base 0.10,
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20 | * which is:
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21 | *
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22 | * Original copyright notice is retained at the end of this file.
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23 | *
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24 | * This version is an adaptation of ping.c from busybox.
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25 | * The code was modified by Bart Visscher <magick@linux-fan.com>
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26 | */
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27 |
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28 | #include <net/if.h>
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29 | #include <netinet/ip_icmp.h>
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30 | #include "libbb.h"
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31 |
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32 | #if ENABLE_PING6
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33 | #include <netinet/icmp6.h>
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34 | /* I see RENUMBERED constants in bits/in.h - !!?
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35 | * What a fuck is going on with libc? Is it a glibc joke? */
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36 | #ifdef IPV6_2292HOPLIMIT
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37 | #undef IPV6_HOPLIMIT
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38 | #define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
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39 | #endif
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40 | #endif
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41 |
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42 | enum {
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43 | DEFDATALEN = 56,
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44 | MAXIPLEN = 60,
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45 | MAXICMPLEN = 76,
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46 | MAXPACKET = 65468,
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47 | MAX_DUP_CHK = (8 * 128),
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48 | MAXWAIT = 10,
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49 | PINGINTERVAL = 1, /* 1 second */
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50 | };
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51 |
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52 | /* common routines */
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53 |
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54 | static int in_cksum(unsigned short *buf, int sz)
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55 | {
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56 | int nleft = sz;
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57 | int sum = 0;
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58 | unsigned short *w = buf;
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59 | unsigned short ans = 0;
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60 |
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61 | while (nleft > 1) {
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62 | sum += *w++;
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63 | nleft -= 2;
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64 | }
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65 |
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66 | if (nleft == 1) {
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67 | *(unsigned char *) (&ans) = *(unsigned char *) w;
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68 | sum += ans;
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69 | }
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70 |
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71 | sum = (sum >> 16) + (sum & 0xFFFF);
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72 | sum += (sum >> 16);
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73 | ans = ~sum;
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74 | return ans;
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75 | }
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76 |
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77 | #if !ENABLE_FEATURE_FANCY_PING
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78 |
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79 | /* simple version */
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80 |
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81 | static char *hostname;
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82 |
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83 | static void noresp(int ign ATTRIBUTE_UNUSED)
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84 | {
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85 | printf("No response from %s\n", hostname);
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86 | exit(EXIT_FAILURE);
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87 | }
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88 |
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89 | static void ping4(len_and_sockaddr *lsa)
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90 | {
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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 | pingaddr = lsa->sin;
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98 |
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99 | pkt = (struct icmp *) packet;
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100 | memset(pkt, 0, sizeof(packet));
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101 | pkt->icmp_type = ICMP_ECHO;
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102 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
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103 |
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104 | c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN,
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105 | (struct sockaddr *) &pingaddr, sizeof(pingaddr));
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106 |
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107 | /* listen for replies */
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108 | while (1) {
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109 | struct sockaddr_in from;
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110 | socklen_t fromlen = sizeof(from);
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111 |
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112 | c = recvfrom(pingsock, packet, sizeof(packet), 0,
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113 | (struct sockaddr *) &from, &fromlen);
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114 | if (c < 0) {
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115 | if (errno != EINTR)
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116 | bb_perror_msg("recvfrom");
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117 | continue;
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118 | }
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119 | if (c >= 76) { /* ip + icmp */
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120 | struct iphdr *iphdr = (struct iphdr *) packet;
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121 |
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122 | pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
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123 | if (pkt->icmp_type == ICMP_ECHOREPLY)
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124 | break;
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125 | }
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126 | }
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127 | if (ENABLE_FEATURE_CLEAN_UP)
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128 | close(pingsock);
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129 | }
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130 |
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131 | #if ENABLE_PING6
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132 | static void ping6(len_and_sockaddr *lsa)
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133 | {
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134 | struct sockaddr_in6 pingaddr;
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135 | struct icmp6_hdr *pkt;
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136 | int pingsock, c;
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137 | int sockopt;
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138 | char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
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139 |
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140 | pingsock = create_icmp6_socket();
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141 | pingaddr = lsa->sin6;
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142 |
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143 | pkt = (struct icmp6_hdr *) packet;
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144 | memset(pkt, 0, sizeof(packet));
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145 | pkt->icmp6_type = ICMP6_ECHO_REQUEST;
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146 |
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147 | sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
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148 | setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
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149 |
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150 | c = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr),
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151 | (struct sockaddr *) &pingaddr, sizeof(pingaddr));
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152 |
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153 | /* listen for replies */
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154 | while (1) {
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155 | struct sockaddr_in6 from;
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156 | socklen_t fromlen = sizeof(from);
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157 |
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158 | c = recvfrom(pingsock, packet, sizeof(packet), 0,
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159 | (struct sockaddr *) &from, &fromlen);
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160 | if (c < 0) {
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161 | if (errno != EINTR)
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162 | bb_perror_msg("recvfrom");
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163 | continue;
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164 | }
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165 | if (c >= 8) { /* icmp6_hdr */
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166 | pkt = (struct icmp6_hdr *) packet;
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167 | if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
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168 | break;
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169 | }
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170 | }
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171 | if (ENABLE_FEATURE_CLEAN_UP)
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172 | close(pingsock);
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173 | }
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174 | #endif
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175 |
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176 | int ping_main(int argc, char **argv);
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177 | int ping_main(int argc, char **argv)
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178 | {
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179 | len_and_sockaddr *lsa;
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180 | #if ENABLE_PING6
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181 | sa_family_t af = AF_UNSPEC;
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182 |
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183 | while ((++argv)[0] && argv[0][0] == '-') {
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184 | if (argv[0][1] == '4') {
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185 | af = AF_INET;
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186 | continue;
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187 | }
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188 | if (argv[0][1] == '6') {
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189 | af = AF_INET6;
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190 | continue;
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191 | }
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192 | bb_show_usage();
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193 | }
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194 | #else
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195 | argv++;
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196 | #endif
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197 |
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198 | hostname = *argv;
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199 | if (!hostname)
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200 | bb_show_usage();
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201 |
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202 | #if ENABLE_PING6
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203 | lsa = xhost_and_af2sockaddr(hostname, 0, af);
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204 | #else
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205 | lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
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206 | #endif
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207 | /* Set timer _after_ DNS resolution */
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208 | signal(SIGALRM, noresp);
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209 | alarm(5); /* give the host 5000ms to respond */
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210 |
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211 | #if ENABLE_PING6
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212 | if (lsa->sa.sa_family == AF_INET6)
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213 | ping6(lsa);
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214 | else
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215 | #endif
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216 | ping4(lsa);
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217 | printf("%s is alive!\n", hostname);
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218 | return EXIT_SUCCESS;
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219 | }
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220 |
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221 |
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222 | #else /* FEATURE_FANCY_PING */
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223 |
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224 |
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225 | /* full(er) version */
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226 |
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227 | #define OPT_STRING ("qvc:s:I:4" USE_PING6("6"))
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228 | enum {
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229 | OPT_QUIET = 1 << 0,
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230 | OPT_VERBOSE = 1 << 1,
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231 | OPT_c = 1 << 2,
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232 | OPT_s = 1 << 3,
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233 | OPT_I = 1 << 4,
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234 | OPT_IPV4 = 1 << 5,
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235 | OPT_IPV6 = (1 << 6) * ENABLE_PING6,
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236 | };
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237 |
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238 |
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239 | struct globals {
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240 | int pingsock;
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241 | len_and_sockaddr *source_lsa;
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242 | unsigned datalen;
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243 | int if_index;
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244 | unsigned long ntransmitted, nreceived, nrepeats, pingcount;
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245 | uint16_t myid;
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246 | unsigned tmin, tmax; /* in us */
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247 | unsigned long long tsum; /* in us, sum of all times */
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248 | const char *hostname;
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249 | const char *dotted;
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250 | union {
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251 | struct sockaddr sa;
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252 | struct sockaddr_in sin;
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253 | #if ENABLE_PING6
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254 | struct sockaddr_in6 sin6;
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255 | #endif
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256 | } pingaddr;
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257 | char rcvd_tbl[MAX_DUP_CHK / 8];
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258 | };
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259 | #define G (*(struct globals*)&bb_common_bufsiz1)
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260 | #define pingsock (G.pingsock )
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261 | #define source_lsa (G.source_lsa )
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262 | #define datalen (G.datalen )
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263 | #define if_index (G.if_index )
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264 | #define ntransmitted (G.ntransmitted)
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265 | #define nreceived (G.nreceived )
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266 | #define nrepeats (G.nrepeats )
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267 | #define pingcount (G.pingcount )
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268 | #define myid (G.myid )
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269 | #define tmin (G.tmin )
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270 | #define tmax (G.tmax )
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271 | #define tsum (G.tsum )
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272 | #define hostname (G.hostname )
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273 | #define dotted (G.dotted )
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274 | #define pingaddr (G.pingaddr )
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275 | #define rcvd_tbl (G.rcvd_tbl )
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276 | void BUG_ping_globals_too_big(void);
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277 | #define INIT_G() do { \
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278 | if (sizeof(G) > COMMON_BUFSIZE) \
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279 | BUG_ping_globals_too_big(); \
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280 | pingsock = -1; \
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281 | tmin = UINT_MAX; \
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282 | } while (0)
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283 |
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284 |
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285 | #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
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286 | #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
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287 | #define SET(bit) (A(bit) |= B(bit))
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288 | #define CLR(bit) (A(bit) &= (~B(bit)))
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289 | #define TST(bit) (A(bit) & B(bit))
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290 |
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291 | /**************************************************************************/
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292 |
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293 | static void pingstats(int junk ATTRIBUTE_UNUSED)
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294 | {
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295 | signal(SIGINT, SIG_IGN);
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296 |
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297 | printf("\n--- %s ping statistics ---\n", hostname);
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298 | printf("%lu packets transmitted, ", ntransmitted);
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299 | printf("%lu packets received, ", nreceived);
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300 | if (nrepeats)
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301 | printf("%lu duplicates, ", nrepeats);
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302 | if (ntransmitted)
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303 | ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
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304 | printf("%lu%% packet loss\n", ntransmitted);
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305 | if (tmin != UINT_MAX) {
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306 | unsigned tavg = tsum / (nreceived + nrepeats);
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307 | printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
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308 | tmin / 1000, tmin % 1000,
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309 | tavg / 1000, tavg % 1000,
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310 | tmax / 1000, tmax % 1000);
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311 | }
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312 | exit(nreceived == 0); /* (nreceived == 0) is true (1) -- 'failure' */
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313 | }
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314 |
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315 | static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
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316 | {
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317 | int sz;
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318 |
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319 | CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
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320 | ntransmitted++;
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321 |
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322 | /* sizeof(pingaddr) can be larger than real sa size, but I think
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323 | * it doesn't matter */
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324 | sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr));
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325 | if (sz != size_pkt)
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326 | bb_error_msg_and_die(bb_msg_write_error);
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327 |
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328 | signal(SIGALRM, sp);
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329 | if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
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330 | alarm(PINGINTERVAL);
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331 | } else { /* done, wait for the last ping to come back */
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332 | /* todo, don't necessarily need to wait so long... */
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333 | signal(SIGALRM, pingstats);
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334 | alarm(MAXWAIT);
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335 | }
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336 | }
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337 |
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338 | static void sendping4(int junk ATTRIBUTE_UNUSED)
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339 | {
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340 | /* +4 reserves a place for timestamp, which may end up sitting
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341 | * *after* packet. Saves one if() */
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342 | struct icmp *pkt = alloca(datalen + ICMP_MINLEN + 4);
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343 |
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344 | pkt->icmp_type = ICMP_ECHO;
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345 | pkt->icmp_code = 0;
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346 | pkt->icmp_cksum = 0;
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347 | pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
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348 | pkt->icmp_id = myid;
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349 |
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350 | /* We don't do hton, because we will read it back on the same machine */
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351 | /*if (datalen >= 4)*/
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352 | *(uint32_t*)&pkt->icmp_dun = monotonic_us();
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353 |
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354 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
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355 |
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356 | sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
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357 | }
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358 | #if ENABLE_PING6
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359 | static void sendping6(int junk ATTRIBUTE_UNUSED)
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360 | {
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361 | struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr) + 4);
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362 |
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363 | pkt->icmp6_type = ICMP6_ECHO_REQUEST;
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364 | pkt->icmp6_code = 0;
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365 | pkt->icmp6_cksum = 0;
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366 | pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
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367 | pkt->icmp6_id = myid;
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368 |
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369 | /*if (datalen >= 4)*/
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370 | *(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
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371 |
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372 | sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
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373 | }
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374 | #endif
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375 |
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376 | static const char *icmp_type_name(int id)
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377 | {
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378 | switch (id) {
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379 | case ICMP_ECHOREPLY: return "Echo Reply";
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380 | case ICMP_DEST_UNREACH: return "Destination Unreachable";
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381 | case ICMP_SOURCE_QUENCH: return "Source Quench";
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382 | case ICMP_REDIRECT: return "Redirect (change route)";
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383 | case ICMP_ECHO: return "Echo Request";
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384 | case ICMP_TIME_EXCEEDED: return "Time Exceeded";
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385 | case ICMP_PARAMETERPROB: return "Parameter Problem";
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386 | case ICMP_TIMESTAMP: return "Timestamp Request";
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387 | case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
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388 | case ICMP_INFO_REQUEST: return "Information Request";
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389 | case ICMP_INFO_REPLY: return "Information Reply";
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390 | case ICMP_ADDRESS: return "Address Mask Request";
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391 | case ICMP_ADDRESSREPLY: return "Address Mask Reply";
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392 | default: return "unknown ICMP type";
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393 | }
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394 | }
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395 | #if ENABLE_PING6
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396 | /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
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397 | * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
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398 | #ifndef MLD_LISTENER_QUERY
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399 | # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
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400 | #endif
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401 | #ifndef MLD_LISTENER_REPORT
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402 | # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
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403 | #endif
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404 | #ifndef MLD_LISTENER_REDUCTION
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405 | # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
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406 | #endif
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407 | static const char *icmp6_type_name(int id)
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408 | {
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409 | switch (id) {
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410 | case ICMP6_DST_UNREACH: return "Destination Unreachable";
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411 | case ICMP6_PACKET_TOO_BIG: return "Packet too big";
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412 | case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
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413 | case ICMP6_PARAM_PROB: return "Parameter Problem";
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414 | case ICMP6_ECHO_REPLY: return "Echo Reply";
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415 | case ICMP6_ECHO_REQUEST: return "Echo Request";
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416 | case MLD_LISTENER_QUERY: return "Listener Query";
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417 | case MLD_LISTENER_REPORT: return "Listener Report";
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418 | case MLD_LISTENER_REDUCTION: return "Listener Reduction";
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419 | default: return "unknown ICMP type";
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420 | }
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421 | }
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422 | #endif
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423 |
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424 | static void unpack_tail(int sz, uint32_t *tp,
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425 | const char *from_str,
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426 | uint16_t recv_seq, int ttl)
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427 | {
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428 | const char *dupmsg = " (DUP!)";
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429 | unsigned triptime = triptime; /* for gcc */
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430 |
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431 | ++nreceived;
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432 |
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433 | if (tp) {
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434 | /* (int32_t) cast is for hypothetical 64-bit unsigned */
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435 | /* (doesn't hurt 32-bit real-world anyway) */
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436 | triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
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437 | tsum += triptime;
|
---|
438 | if (triptime < tmin)
|
---|
439 | tmin = triptime;
|
---|
440 | if (triptime > tmax)
|
---|
441 | tmax = triptime;
|
---|
442 | }
|
---|
443 |
|
---|
444 | if (TST(recv_seq % MAX_DUP_CHK)) {
|
---|
445 | ++nrepeats;
|
---|
446 | --nreceived;
|
---|
447 | } else {
|
---|
448 | SET(recv_seq % MAX_DUP_CHK);
|
---|
449 | dupmsg += 7;
|
---|
450 | }
|
---|
451 |
|
---|
452 | if (option_mask32 & OPT_QUIET)
|
---|
453 | return;
|
---|
454 |
|
---|
455 | printf("%d bytes from %s: seq=%u ttl=%d", sz,
|
---|
456 | from_str, recv_seq, ttl);
|
---|
457 | if (tp)
|
---|
458 | printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
|
---|
459 | puts(dupmsg);
|
---|
460 | fflush(stdout);
|
---|
461 | }
|
---|
462 | static void unpack4(char *buf, int sz, struct sockaddr_in *from)
|
---|
463 | {
|
---|
464 | struct icmp *icmppkt;
|
---|
465 | struct iphdr *iphdr;
|
---|
466 | int hlen;
|
---|
467 |
|
---|
468 | /* discard if too short */
|
---|
469 | if (sz < (datalen + ICMP_MINLEN))
|
---|
470 | return;
|
---|
471 |
|
---|
472 | /* check IP header */
|
---|
473 | iphdr = (struct iphdr *) buf;
|
---|
474 | hlen = iphdr->ihl << 2;
|
---|
475 | sz -= hlen;
|
---|
476 | icmppkt = (struct icmp *) (buf + hlen);
|
---|
477 | if (icmppkt->icmp_id != myid)
|
---|
478 | return; /* not our ping */
|
---|
479 |
|
---|
480 | if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
|
---|
481 | uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
|
---|
482 | uint32_t *tp = NULL;
|
---|
483 |
|
---|
484 | if (sz >= ICMP_MINLEN + sizeof(uint32_t))
|
---|
485 | tp = (uint32_t *) icmppkt->icmp_data;
|
---|
486 | unpack_tail(sz, tp,
|
---|
487 | inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
|
---|
488 | recv_seq, iphdr->ttl);
|
---|
489 | } else if (icmppkt->icmp_type != ICMP_ECHO) {
|
---|
490 | bb_error_msg("warning: got ICMP %d (%s)",
|
---|
491 | icmppkt->icmp_type,
|
---|
492 | icmp_type_name(icmppkt->icmp_type));
|
---|
493 | }
|
---|
494 | }
|
---|
495 | #if ENABLE_PING6
|
---|
496 | static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
|
---|
497 | {
|
---|
498 | struct icmp6_hdr *icmppkt;
|
---|
499 | char buf[INET6_ADDRSTRLEN];
|
---|
500 |
|
---|
501 | /* discard if too short */
|
---|
502 | if (sz < (datalen + sizeof(struct icmp6_hdr)))
|
---|
503 | return;
|
---|
504 |
|
---|
505 | icmppkt = (struct icmp6_hdr *) packet;
|
---|
506 | if (icmppkt->icmp6_id != myid)
|
---|
507 | return; /* not our ping */
|
---|
508 |
|
---|
509 | if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
|
---|
510 | uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
|
---|
511 | uint32_t *tp = NULL;
|
---|
512 |
|
---|
513 | if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
|
---|
514 | tp = (uint32_t *) &icmppkt->icmp6_data8[4];
|
---|
515 | unpack_tail(sz, tp,
|
---|
516 | inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
|
---|
517 | buf, sizeof(buf)),
|
---|
518 | recv_seq, hoplimit);
|
---|
519 | } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
|
---|
520 | bb_error_msg("warning: got ICMP %d (%s)",
|
---|
521 | icmppkt->icmp6_type,
|
---|
522 | icmp6_type_name(icmppkt->icmp6_type));
|
---|
523 | }
|
---|
524 | }
|
---|
525 | #endif
|
---|
526 |
|
---|
527 | static void ping4(len_and_sockaddr *lsa)
|
---|
528 | {
|
---|
529 | char packet[datalen + MAXIPLEN + MAXICMPLEN];
|
---|
530 | int sockopt;
|
---|
531 |
|
---|
532 | pingsock = create_icmp_socket();
|
---|
533 | pingaddr.sin = lsa->sin;
|
---|
534 | if (source_lsa) {
|
---|
535 | if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
|
---|
536 | &source_lsa->sa, source_lsa->len))
|
---|
537 | bb_error_msg_and_die("can't set multicast source interface");
|
---|
538 | xbind(pingsock, &source_lsa->sa, source_lsa->len);
|
---|
539 | }
|
---|
540 |
|
---|
541 | /* enable broadcast pings */
|
---|
542 | setsockopt_broadcast(pingsock);
|
---|
543 |
|
---|
544 | /* set recv buf for broadcast pings */
|
---|
545 | sockopt = 48 * 1024; /* explain why 48k? */
|
---|
546 | setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
|
---|
547 |
|
---|
548 | signal(SIGINT, pingstats);
|
---|
549 |
|
---|
550 | /* start the ping's going ... */
|
---|
551 | sendping4(0);
|
---|
552 |
|
---|
553 | /* listen for replies */
|
---|
554 | while (1) {
|
---|
555 | struct sockaddr_in from;
|
---|
556 | socklen_t fromlen = (socklen_t) sizeof(from);
|
---|
557 | int c;
|
---|
558 |
|
---|
559 | c = recvfrom(pingsock, packet, sizeof(packet), 0,
|
---|
560 | (struct sockaddr *) &from, &fromlen);
|
---|
561 | if (c < 0) {
|
---|
562 | if (errno != EINTR)
|
---|
563 | bb_perror_msg("recvfrom");
|
---|
564 | continue;
|
---|
565 | }
|
---|
566 | unpack4(packet, c, &from);
|
---|
567 | if (pingcount > 0 && nreceived >= pingcount)
|
---|
568 | break;
|
---|
569 | }
|
---|
570 | }
|
---|
571 | #if ENABLE_PING6
|
---|
572 | extern int BUG_bad_offsetof_icmp6_cksum(void);
|
---|
573 | static void ping6(len_and_sockaddr *lsa)
|
---|
574 | {
|
---|
575 | char packet[datalen + MAXIPLEN + MAXICMPLEN];
|
---|
576 | int sockopt;
|
---|
577 | struct msghdr msg;
|
---|
578 | struct sockaddr_in6 from;
|
---|
579 | struct iovec iov;
|
---|
580 | char control_buf[CMSG_SPACE(36)];
|
---|
581 |
|
---|
582 | pingsock = create_icmp6_socket();
|
---|
583 | pingaddr.sin6 = lsa->sin6;
|
---|
584 | /* untested whether "-I addr" really works for IPv6: */
|
---|
585 | if (source_lsa)
|
---|
586 | xbind(pingsock, &source_lsa->sa, source_lsa->len);
|
---|
587 |
|
---|
588 | #ifdef ICMP6_FILTER
|
---|
589 | {
|
---|
590 | struct icmp6_filter filt;
|
---|
591 | if (!(option_mask32 & OPT_VERBOSE)) {
|
---|
592 | ICMP6_FILTER_SETBLOCKALL(&filt);
|
---|
593 | ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
|
---|
594 | } else {
|
---|
595 | ICMP6_FILTER_SETPASSALL(&filt);
|
---|
596 | }
|
---|
597 | if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
|
---|
598 | sizeof(filt)) < 0)
|
---|
599 | bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
|
---|
600 | }
|
---|
601 | #endif /*ICMP6_FILTER*/
|
---|
602 |
|
---|
603 | /* enable broadcast pings */
|
---|
604 | setsockopt_broadcast(pingsock);
|
---|
605 |
|
---|
606 | /* set recv buf for broadcast pings */
|
---|
607 | sockopt = 48 * 1024; /* explain why 48k? */
|
---|
608 | setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
|
---|
609 |
|
---|
610 | sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
|
---|
611 | if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
|
---|
612 | BUG_bad_offsetof_icmp6_cksum();
|
---|
613 | setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
|
---|
614 |
|
---|
615 | /* request ttl info to be returned in ancillary data */
|
---|
616 | setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
|
---|
617 |
|
---|
618 | if (if_index)
|
---|
619 | pingaddr.sin6.sin6_scope_id = if_index;
|
---|
620 |
|
---|
621 | signal(SIGINT, pingstats);
|
---|
622 |
|
---|
623 | /* start the ping's going ... */
|
---|
624 | sendping6(0);
|
---|
625 |
|
---|
626 | /* listen for replies */
|
---|
627 | msg.msg_name = &from;
|
---|
628 | msg.msg_namelen = sizeof(from);
|
---|
629 | msg.msg_iov = &iov;
|
---|
630 | msg.msg_iovlen = 1;
|
---|
631 | msg.msg_control = control_buf;
|
---|
632 | iov.iov_base = packet;
|
---|
633 | iov.iov_len = sizeof(packet);
|
---|
634 | while (1) {
|
---|
635 | int c;
|
---|
636 | struct cmsghdr *mp;
|
---|
637 | int hoplimit = -1;
|
---|
638 | msg.msg_controllen = sizeof(control_buf);
|
---|
639 |
|
---|
640 | c = recvmsg(pingsock, &msg, 0);
|
---|
641 | if (c < 0) {
|
---|
642 | if (errno != EINTR)
|
---|
643 | bb_perror_msg("recvfrom");
|
---|
644 | continue;
|
---|
645 | }
|
---|
646 | for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
|
---|
647 | if (mp->cmsg_level == SOL_IPV6
|
---|
648 | && mp->cmsg_type == IPV6_HOPLIMIT
|
---|
649 | /* don't check len - we trust the kernel: */
|
---|
650 | /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
|
---|
651 | ) {
|
---|
652 | hoplimit = *(int*)CMSG_DATA(mp);
|
---|
653 | }
|
---|
654 | }
|
---|
655 | unpack6(packet, c, &from, hoplimit);
|
---|
656 | if (pingcount > 0 && nreceived >= pingcount)
|
---|
657 | break;
|
---|
658 | }
|
---|
659 | }
|
---|
660 | #endif
|
---|
661 |
|
---|
662 | static void ping(len_and_sockaddr *lsa)
|
---|
663 | {
|
---|
664 | printf("PING %s (%s)", hostname, dotted);
|
---|
665 | if (source_lsa) {
|
---|
666 | printf(" from %s",
|
---|
667 | xmalloc_sockaddr2dotted_noport(&source_lsa->sa));
|
---|
668 | }
|
---|
669 | printf(": %d data bytes\n", datalen);
|
---|
670 |
|
---|
671 | #if ENABLE_PING6
|
---|
672 | if (lsa->sa.sa_family == AF_INET6)
|
---|
673 | ping6(lsa);
|
---|
674 | else
|
---|
675 | #endif
|
---|
676 | ping4(lsa);
|
---|
677 | }
|
---|
678 |
|
---|
679 | int ping_main(int argc, char **argv);
|
---|
680 | int ping_main(int argc, char **argv)
|
---|
681 | {
|
---|
682 | len_and_sockaddr *lsa;
|
---|
683 | char *opt_c, *opt_s, *opt_I;
|
---|
684 | USE_PING6(sa_family_t af = AF_UNSPEC;)
|
---|
685 |
|
---|
686 | INIT_G();
|
---|
687 |
|
---|
688 | datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
|
---|
689 |
|
---|
690 | /* exactly one argument needed, -v and -q don't mix */
|
---|
691 | opt_complementary = "=1:q--v:v--q";
|
---|
692 | getopt32(argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
|
---|
693 | if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c
|
---|
694 | if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
|
---|
695 | if (option_mask32 & OPT_I) { // -I
|
---|
696 | if_index = if_nametoindex(opt_I);
|
---|
697 | if (!if_index) {
|
---|
698 | /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
|
---|
699 | source_lsa = xdotted2sockaddr(opt_I, 0);
|
---|
700 | }
|
---|
701 | }
|
---|
702 | myid = (uint16_t) getpid();
|
---|
703 | hostname = argv[optind];
|
---|
704 | #if ENABLE_PING6
|
---|
705 | if (option_mask32 & OPT_IPV4)
|
---|
706 | af = AF_INET;
|
---|
707 | if (option_mask32 & OPT_IPV6)
|
---|
708 | af = AF_INET6;
|
---|
709 | lsa = xhost_and_af2sockaddr(hostname, 0, af);
|
---|
710 | #else
|
---|
711 | lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
|
---|
712 | #endif
|
---|
713 |
|
---|
714 | if (source_lsa && source_lsa->sa.sa_family != lsa->sa.sa_family)
|
---|
715 | /* leaking it here... */
|
---|
716 | source_lsa = NULL;
|
---|
717 |
|
---|
718 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa);
|
---|
719 | ping(lsa);
|
---|
720 | pingstats(0);
|
---|
721 | return EXIT_SUCCESS;
|
---|
722 | }
|
---|
723 | #endif /* FEATURE_FANCY_PING */
|
---|
724 |
|
---|
725 |
|
---|
726 | #if ENABLE_PING6
|
---|
727 | int ping6_main(int argc, char **argv);
|
---|
728 | int ping6_main(int argc, char **argv)
|
---|
729 | {
|
---|
730 | argv[0] = (char*)"-6";
|
---|
731 | return ping_main(argc + 1, argv - 1);
|
---|
732 | }
|
---|
733 | #endif
|
---|
734 |
|
---|
735 | /* from ping6.c:
|
---|
736 | * Copyright (c) 1989 The Regents of the University of California.
|
---|
737 | * All rights reserved.
|
---|
738 | *
|
---|
739 | * This code is derived from software contributed to Berkeley by
|
---|
740 | * Mike Muuss.
|
---|
741 | *
|
---|
742 | * Redistribution and use in source and binary forms, with or without
|
---|
743 | * modification, are permitted provided that the following conditions
|
---|
744 | * are met:
|
---|
745 | * 1. Redistributions of source code must retain the above copyright
|
---|
746 | * notice, this list of conditions and the following disclaimer.
|
---|
747 | * 2. Redistributions in binary form must reproduce the above copyright
|
---|
748 | * notice, this list of conditions and the following disclaimer in the
|
---|
749 | * documentation and/or other materials provided with the distribution.
|
---|
750 | *
|
---|
751 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
|
---|
752 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
|
---|
753 | *
|
---|
754 | * 4. Neither the name of the University nor the names of its contributors
|
---|
755 | * may be used to endorse or promote products derived from this software
|
---|
756 | * without specific prior written permission.
|
---|
757 | *
|
---|
758 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
---|
759 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
---|
760 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
---|
761 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
---|
762 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
---|
763 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
---|
764 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
---|
765 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
---|
766 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
---|
767 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
---|
768 | * SUCH DAMAGE.
|
---|
769 | */
|
---|