[3320] | 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 source tree.
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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 | MAX_DUP_CHK = (8 * 128),
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| 47 | MAXWAIT = 10,
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| 48 | PINGINTERVAL = 1, /* 1 second */
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| 49 | };
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| 50 |
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| 51 | /* Common routines */
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| 52 |
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| 53 | static int in_cksum(unsigned short *buf, int sz)
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| 54 | {
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| 55 | int nleft = sz;
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| 56 | int sum = 0;
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| 57 | unsigned short *w = buf;
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| 58 | unsigned short ans = 0;
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| 59 |
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| 60 | while (nleft > 1) {
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| 61 | sum += *w++;
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| 62 | nleft -= 2;
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| 63 | }
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| 64 |
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| 65 | if (nleft == 1) {
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| 66 | *(unsigned char *) (&ans) = *(unsigned char *) w;
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| 67 | sum += ans;
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| 68 | }
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| 69 |
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| 70 | sum = (sum >> 16) + (sum & 0xFFFF);
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| 71 | sum += (sum >> 16);
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| 72 | ans = ~sum;
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| 73 | return ans;
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| 74 | }
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| 75 |
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| 76 | #if !ENABLE_FEATURE_FANCY_PING
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| 77 |
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| 78 | /* Simple version */
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| 79 |
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| 80 | struct globals {
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| 81 | char *hostname;
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| 82 | char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
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| 83 | } FIX_ALIASING;
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| 84 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 85 | #define INIT_G() do { } while (0)
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| 86 |
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| 87 | static void noresp(int ign UNUSED_PARAM)
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| 88 | {
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| 89 | printf("No response from %s\n", G.hostname);
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| 90 | exit(EXIT_FAILURE);
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| 91 | }
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| 92 |
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| 93 | static void ping4(len_and_sockaddr *lsa)
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| 94 | {
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| 95 | struct icmp *pkt;
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| 96 | int pingsock, c;
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| 97 |
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| 98 | pingsock = create_icmp_socket();
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| 99 |
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| 100 | pkt = (struct icmp *) G.packet;
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| 101 | memset(pkt, 0, sizeof(G.packet));
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| 102 | pkt->icmp_type = ICMP_ECHO;
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| 103 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(G.packet));
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| 104 |
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| 105 | xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
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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, G.packet, sizeof(G.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 *) G.packet;
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| 121 |
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| 122 | pkt = (struct icmp *) (G.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 icmp6_hdr *pkt;
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| 135 | int pingsock, c;
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| 136 | int sockopt;
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| 137 |
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| 138 | pingsock = create_icmp6_socket();
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| 139 |
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| 140 | pkt = (struct icmp6_hdr *) G.packet;
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| 141 | memset(pkt, 0, sizeof(G.packet));
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| 142 | pkt->icmp6_type = ICMP6_ECHO_REQUEST;
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| 143 |
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| 144 | sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
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| 145 | setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
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| 146 |
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| 147 | xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
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| 148 |
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| 149 | /* listen for replies */
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| 150 | while (1) {
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| 151 | struct sockaddr_in6 from;
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| 152 | socklen_t fromlen = sizeof(from);
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| 153 |
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| 154 | c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
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| 155 | (struct sockaddr *) &from, &fromlen);
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| 156 | if (c < 0) {
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| 157 | if (errno != EINTR)
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| 158 | bb_perror_msg("recvfrom");
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| 159 | continue;
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| 160 | }
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| 161 | if (c >= ICMP_MINLEN) { /* icmp6_hdr */
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| 162 | pkt = (struct icmp6_hdr *) G.packet;
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| 163 | if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
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| 164 | break;
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| 165 | }
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| 166 | }
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| 167 | if (ENABLE_FEATURE_CLEAN_UP)
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| 168 | close(pingsock);
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| 169 | }
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| 170 | #endif
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| 171 |
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| 172 | #if !ENABLE_PING6
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| 173 | # define common_ping_main(af, argv) common_ping_main(argv)
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| 174 | #endif
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| 175 | static int common_ping_main(sa_family_t af, char **argv)
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| 176 | {
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| 177 | len_and_sockaddr *lsa;
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| 178 |
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| 179 | INIT_G();
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| 180 |
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| 181 | #if ENABLE_PING6
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| 182 | while ((++argv)[0] && argv[0][0] == '-') {
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| 183 | if (argv[0][1] == '4') {
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| 184 | af = AF_INET;
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| 185 | continue;
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| 186 | }
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| 187 | if (argv[0][1] == '6') {
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| 188 | af = AF_INET6;
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| 189 | continue;
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| 190 | }
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| 191 | bb_show_usage();
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| 192 | }
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| 193 | #else
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| 194 | argv++;
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| 195 | #endif
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| 196 |
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| 197 | G.hostname = *argv;
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| 198 | if (!G.hostname)
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| 199 | bb_show_usage();
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| 200 |
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| 201 | #if ENABLE_PING6
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| 202 | lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
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| 203 | #else
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| 204 | lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
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| 205 | #endif
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| 206 | /* Set timer _after_ DNS resolution */
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| 207 | signal(SIGALRM, noresp);
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| 208 | alarm(5); /* give the host 5000ms to respond */
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| 209 |
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| 210 | #if ENABLE_PING6
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| 211 | if (lsa->u.sa.sa_family == AF_INET6)
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| 212 | ping6(lsa);
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| 213 | else
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| 214 | #endif
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| 215 | ping4(lsa);
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| 216 | printf("%s is alive!\n", G.hostname);
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| 217 | return EXIT_SUCCESS;
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| 218 | }
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| 219 |
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| 220 |
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| 221 | #else /* FEATURE_FANCY_PING */
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| 222 |
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| 223 |
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| 224 | /* Full(er) version */
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| 225 |
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| 226 | #define OPT_STRING ("qvc:s:w:W:I:4" IF_PING6("6"))
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| 227 | enum {
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| 228 | OPT_QUIET = 1 << 0,
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| 229 | OPT_VERBOSE = 1 << 1,
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| 230 | OPT_c = 1 << 2,
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| 231 | OPT_s = 1 << 3,
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| 232 | OPT_w = 1 << 4,
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| 233 | OPT_W = 1 << 5,
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| 234 | OPT_I = 1 << 6,
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| 235 | OPT_IPV4 = 1 << 7,
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| 236 | OPT_IPV6 = (1 << 8) * ENABLE_PING6,
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| 237 | };
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| 238 |
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| 239 |
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| 240 | struct globals {
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| 241 | int pingsock;
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| 242 | int if_index;
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| 243 | char *str_I;
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| 244 | len_and_sockaddr *source_lsa;
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| 245 | unsigned datalen;
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| 246 | unsigned pingcount; /* must be int-sized */
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| 247 | unsigned long ntransmitted, nreceived, nrepeats;
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| 248 | uint16_t myid;
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| 249 | unsigned tmin, tmax; /* in us */
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| 250 | unsigned long long tsum; /* in us, sum of all times */
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| 251 | unsigned deadline;
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| 252 | unsigned timeout;
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| 253 | unsigned total_secs;
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| 254 | unsigned sizeof_rcv_packet;
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| 255 | char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
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| 256 | void *snd_packet; /* [datalen + ipv4/ipv6_const] */
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| 257 | const char *hostname;
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| 258 | const char *dotted;
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| 259 | union {
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| 260 | struct sockaddr sa;
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| 261 | struct sockaddr_in sin;
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| 262 | #if ENABLE_PING6
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| 263 | struct sockaddr_in6 sin6;
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| 264 | #endif
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| 265 | } pingaddr;
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| 266 | char rcvd_tbl[MAX_DUP_CHK / 8];
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| 267 | } FIX_ALIASING;
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| 268 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 269 | #define pingsock (G.pingsock )
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| 270 | #define if_index (G.if_index )
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| 271 | #define source_lsa (G.source_lsa )
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| 272 | #define str_I (G.str_I )
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| 273 | #define datalen (G.datalen )
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| 274 | #define ntransmitted (G.ntransmitted)
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| 275 | #define nreceived (G.nreceived )
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| 276 | #define nrepeats (G.nrepeats )
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| 277 | #define pingcount (G.pingcount )
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| 278 | #define myid (G.myid )
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| 279 | #define tmin (G.tmin )
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| 280 | #define tmax (G.tmax )
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| 281 | #define tsum (G.tsum )
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| 282 | #define deadline (G.deadline )
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| 283 | #define timeout (G.timeout )
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| 284 | #define total_secs (G.total_secs )
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| 285 | #define hostname (G.hostname )
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| 286 | #define dotted (G.dotted )
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| 287 | #define pingaddr (G.pingaddr )
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| 288 | #define rcvd_tbl (G.rcvd_tbl )
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| 289 | void BUG_ping_globals_too_big(void);
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| 290 | #define INIT_G() do { \
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| 291 | if (sizeof(G) > COMMON_BUFSIZE) \
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| 292 | BUG_ping_globals_too_big(); \
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| 293 | pingsock = -1; \
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| 294 | datalen = DEFDATALEN; \
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| 295 | timeout = MAXWAIT; \
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| 296 | tmin = UINT_MAX; \
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| 297 | } while (0)
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| 298 |
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| 299 |
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| 300 | #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
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| 301 | #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
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| 302 | #define SET(bit) (A(bit) |= B(bit))
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| 303 | #define CLR(bit) (A(bit) &= (~B(bit)))
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| 304 | #define TST(bit) (A(bit) & B(bit))
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| 305 |
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| 306 | /**************************************************************************/
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| 307 |
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| 308 | static void print_stats_and_exit(int junk) NORETURN;
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| 309 | static void print_stats_and_exit(int junk UNUSED_PARAM)
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| 310 | {
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| 311 | signal(SIGINT, SIG_IGN);
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| 312 |
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| 313 | printf("\n--- %s ping statistics ---\n", hostname);
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| 314 | printf("%lu packets transmitted, ", ntransmitted);
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| 315 | printf("%lu packets received, ", nreceived);
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| 316 | if (nrepeats)
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| 317 | printf("%lu duplicates, ", nrepeats);
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| 318 | if (ntransmitted)
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| 319 | ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
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| 320 | printf("%lu%% packet loss\n", ntransmitted);
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| 321 | if (tmin != UINT_MAX) {
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| 322 | unsigned tavg = tsum / (nreceived + nrepeats);
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| 323 | printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
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| 324 | tmin / 1000, tmin % 1000,
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| 325 | tavg / 1000, tavg % 1000,
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| 326 | tmax / 1000, tmax % 1000);
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| 327 | }
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| 328 | /* if condition is true, exit with 1 -- 'failure' */
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| 329 | exit(nreceived == 0 || (deadline && nreceived < pingcount));
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| 330 | }
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| 331 |
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| 332 | static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
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| 333 | {
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| 334 | int sz;
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| 335 |
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| 336 | CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
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| 337 | ntransmitted++;
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| 338 |
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| 339 | /* sizeof(pingaddr) can be larger than real sa size, but I think
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| 340 | * it doesn't matter */
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| 341 | sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr));
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| 342 | if (sz != size_pkt)
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| 343 | bb_error_msg_and_die(bb_msg_write_error);
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| 344 |
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| 345 | if (pingcount == 0 || deadline || ntransmitted < pingcount) {
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| 346 | /* Didn't send all pings yet - schedule next in 1s */
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| 347 | signal(SIGALRM, sp);
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| 348 | if (deadline) {
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| 349 | total_secs += PINGINTERVAL;
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| 350 | if (total_secs >= deadline)
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| 351 | signal(SIGALRM, print_stats_and_exit);
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| 352 | }
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| 353 | alarm(PINGINTERVAL);
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| 354 | } else { /* -c NN, and all NN are sent (and no deadline) */
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| 355 | /* Wait for the last ping to come back.
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| 356 | * -W timeout: wait for a response in seconds.
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| 357 | * Affects only timeout in absense of any responses,
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| 358 | * otherwise ping waits for two RTTs. */
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| 359 | unsigned expire = timeout;
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| 360 |
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| 361 | if (nreceived) {
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| 362 | /* approx. 2*tmax, in seconds (2 RTT) */
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| 363 | expire = tmax / (512*1024);
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| 364 | if (expire == 0)
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| 365 | expire = 1;
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| 366 | }
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| 367 | signal(SIGALRM, print_stats_and_exit);
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| 368 | alarm(expire);
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| 369 | }
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| 370 | }
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| 371 |
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| 372 | static void sendping4(int junk UNUSED_PARAM)
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| 373 | {
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| 374 | struct icmp *pkt = G.snd_packet;
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| 375 |
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| 376 | //memset(pkt, 0, datalen + ICMP_MINLEN + 4); - G.snd_packet was xzalloced
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| 377 | pkt->icmp_type = ICMP_ECHO;
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| 378 | /*pkt->icmp_code = 0;*/
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| 379 | pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
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| 380 | pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
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| 381 | pkt->icmp_id = myid;
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| 382 |
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| 383 | /* If datalen < 4, we store timestamp _past_ the packet,
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| 384 | * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
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| 385 | */
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| 386 | /*if (datalen >= 4)*/
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| 387 | /* No hton: we'll read it back on the same machine */
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| 388 | *(uint32_t*)&pkt->icmp_dun = monotonic_us();
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| 389 |
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| 390 | pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
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| 391 |
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| 392 | sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
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| 393 | }
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| 394 | #if ENABLE_PING6
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| 395 | static void sendping6(int junk UNUSED_PARAM)
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| 396 | {
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| 397 | struct icmp6_hdr *pkt = G.snd_packet;
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| 398 |
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| 399 | //memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
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| 400 | pkt->icmp6_type = ICMP6_ECHO_REQUEST;
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| 401 | /*pkt->icmp6_code = 0;*/
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| 402 | /*pkt->icmp6_cksum = 0;*/
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| 403 | pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
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| 404 | pkt->icmp6_id = myid;
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| 405 |
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| 406 | /*if (datalen >= 4)*/
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| 407 | *(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
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| 408 |
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| 409 | //TODO? pkt->icmp_cksum = in_cksum(...);
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| 410 |
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| 411 | sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
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| 412 | }
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| 413 | #endif
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| 414 |
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| 415 | static const char *icmp_type_name(int id)
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| 416 | {
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| 417 | switch (id) {
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| 418 | case ICMP_ECHOREPLY: return "Echo Reply";
|
---|
| 419 | case ICMP_DEST_UNREACH: return "Destination Unreachable";
|
---|
| 420 | case ICMP_SOURCE_QUENCH: return "Source Quench";
|
---|
| 421 | case ICMP_REDIRECT: return "Redirect (change route)";
|
---|
| 422 | case ICMP_ECHO: return "Echo Request";
|
---|
| 423 | case ICMP_TIME_EXCEEDED: return "Time Exceeded";
|
---|
| 424 | case ICMP_PARAMETERPROB: return "Parameter Problem";
|
---|
| 425 | case ICMP_TIMESTAMP: return "Timestamp Request";
|
---|
| 426 | case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
|
---|
| 427 | case ICMP_INFO_REQUEST: return "Information Request";
|
---|
| 428 | case ICMP_INFO_REPLY: return "Information Reply";
|
---|
| 429 | case ICMP_ADDRESS: return "Address Mask Request";
|
---|
| 430 | case ICMP_ADDRESSREPLY: return "Address Mask Reply";
|
---|
| 431 | default: return "unknown ICMP type";
|
---|
| 432 | }
|
---|
| 433 | }
|
---|
| 434 | #if ENABLE_PING6
|
---|
| 435 | /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
|
---|
| 436 | * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
|
---|
| 437 | #ifndef MLD_LISTENER_QUERY
|
---|
| 438 | # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
|
---|
| 439 | #endif
|
---|
| 440 | #ifndef MLD_LISTENER_REPORT
|
---|
| 441 | # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
|
---|
| 442 | #endif
|
---|
| 443 | #ifndef MLD_LISTENER_REDUCTION
|
---|
| 444 | # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
|
---|
| 445 | #endif
|
---|
| 446 | static const char *icmp6_type_name(int id)
|
---|
| 447 | {
|
---|
| 448 | switch (id) {
|
---|
| 449 | case ICMP6_DST_UNREACH: return "Destination Unreachable";
|
---|
| 450 | case ICMP6_PACKET_TOO_BIG: return "Packet too big";
|
---|
| 451 | case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
|
---|
| 452 | case ICMP6_PARAM_PROB: return "Parameter Problem";
|
---|
| 453 | case ICMP6_ECHO_REPLY: return "Echo Reply";
|
---|
| 454 | case ICMP6_ECHO_REQUEST: return "Echo Request";
|
---|
| 455 | case MLD_LISTENER_QUERY: return "Listener Query";
|
---|
| 456 | case MLD_LISTENER_REPORT: return "Listener Report";
|
---|
| 457 | case MLD_LISTENER_REDUCTION: return "Listener Reduction";
|
---|
| 458 | default: return "unknown ICMP type";
|
---|
| 459 | }
|
---|
| 460 | }
|
---|
| 461 | #endif
|
---|
| 462 |
|
---|
| 463 | static void unpack_tail(int sz, uint32_t *tp,
|
---|
| 464 | const char *from_str,
|
---|
| 465 | uint16_t recv_seq, int ttl)
|
---|
| 466 | {
|
---|
| 467 | const char *dupmsg = " (DUP!)";
|
---|
| 468 | unsigned triptime = triptime; /* for gcc */
|
---|
| 469 |
|
---|
| 470 | ++nreceived;
|
---|
| 471 |
|
---|
| 472 | if (tp) {
|
---|
| 473 | /* (int32_t) cast is for hypothetical 64-bit unsigned */
|
---|
| 474 | /* (doesn't hurt 32-bit real-world anyway) */
|
---|
| 475 | triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
|
---|
| 476 | tsum += triptime;
|
---|
| 477 | if (triptime < tmin)
|
---|
| 478 | tmin = triptime;
|
---|
| 479 | if (triptime > tmax)
|
---|
| 480 | tmax = triptime;
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | if (TST(recv_seq % MAX_DUP_CHK)) {
|
---|
| 484 | ++nrepeats;
|
---|
| 485 | --nreceived;
|
---|
| 486 | } else {
|
---|
| 487 | SET(recv_seq % MAX_DUP_CHK);
|
---|
| 488 | dupmsg += 7;
|
---|
| 489 | }
|
---|
| 490 |
|
---|
| 491 | if (option_mask32 & OPT_QUIET)
|
---|
| 492 | return;
|
---|
| 493 |
|
---|
| 494 | printf("%d bytes from %s: seq=%u ttl=%d", sz,
|
---|
| 495 | from_str, recv_seq, ttl);
|
---|
| 496 | if (tp)
|
---|
| 497 | printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
|
---|
| 498 | puts(dupmsg);
|
---|
| 499 | fflush_all();
|
---|
| 500 | }
|
---|
| 501 | static void unpack4(char *buf, int sz, struct sockaddr_in *from)
|
---|
| 502 | {
|
---|
| 503 | struct icmp *icmppkt;
|
---|
| 504 | struct iphdr *iphdr;
|
---|
| 505 | int hlen;
|
---|
| 506 |
|
---|
| 507 | /* discard if too short */
|
---|
| 508 | if (sz < (datalen + ICMP_MINLEN))
|
---|
| 509 | return;
|
---|
| 510 |
|
---|
| 511 | /* check IP header */
|
---|
| 512 | iphdr = (struct iphdr *) buf;
|
---|
| 513 | hlen = iphdr->ihl << 2;
|
---|
| 514 | sz -= hlen;
|
---|
| 515 | icmppkt = (struct icmp *) (buf + hlen);
|
---|
| 516 | if (icmppkt->icmp_id != myid)
|
---|
| 517 | return; /* not our ping */
|
---|
| 518 |
|
---|
| 519 | if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
|
---|
| 520 | uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
|
---|
| 521 | uint32_t *tp = NULL;
|
---|
| 522 |
|
---|
| 523 | if (sz >= ICMP_MINLEN + sizeof(uint32_t))
|
---|
| 524 | tp = (uint32_t *) icmppkt->icmp_data;
|
---|
| 525 | unpack_tail(sz, tp,
|
---|
| 526 | inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
|
---|
| 527 | recv_seq, iphdr->ttl);
|
---|
| 528 | } else if (icmppkt->icmp_type != ICMP_ECHO) {
|
---|
| 529 | bb_error_msg("warning: got ICMP %d (%s)",
|
---|
| 530 | icmppkt->icmp_type,
|
---|
| 531 | icmp_type_name(icmppkt->icmp_type));
|
---|
| 532 | }
|
---|
| 533 | }
|
---|
| 534 | #if ENABLE_PING6
|
---|
| 535 | static void unpack6(char *packet, int sz, /*struct sockaddr_in6 *from,*/ int hoplimit)
|
---|
| 536 | {
|
---|
| 537 | struct icmp6_hdr *icmppkt;
|
---|
| 538 | char buf[INET6_ADDRSTRLEN];
|
---|
| 539 |
|
---|
| 540 | /* discard if too short */
|
---|
| 541 | if (sz < (datalen + sizeof(struct icmp6_hdr)))
|
---|
| 542 | return;
|
---|
| 543 |
|
---|
| 544 | icmppkt = (struct icmp6_hdr *) packet;
|
---|
| 545 | if (icmppkt->icmp6_id != myid)
|
---|
| 546 | return; /* not our ping */
|
---|
| 547 |
|
---|
| 548 | if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
|
---|
| 549 | uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
|
---|
| 550 | uint32_t *tp = NULL;
|
---|
| 551 |
|
---|
| 552 | if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
|
---|
| 553 | tp = (uint32_t *) &icmppkt->icmp6_data8[4];
|
---|
| 554 | unpack_tail(sz, tp,
|
---|
| 555 | inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
|
---|
| 556 | buf, sizeof(buf)),
|
---|
| 557 | recv_seq, hoplimit);
|
---|
| 558 | } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
|
---|
| 559 | bb_error_msg("warning: got ICMP %d (%s)",
|
---|
| 560 | icmppkt->icmp6_type,
|
---|
| 561 | icmp6_type_name(icmppkt->icmp6_type));
|
---|
| 562 | }
|
---|
| 563 | }
|
---|
| 564 | #endif
|
---|
| 565 |
|
---|
| 566 | static void ping4(len_and_sockaddr *lsa)
|
---|
| 567 | {
|
---|
| 568 | int sockopt;
|
---|
| 569 |
|
---|
| 570 | pingsock = create_icmp_socket();
|
---|
| 571 | pingaddr.sin = lsa->u.sin;
|
---|
| 572 | if (source_lsa) {
|
---|
| 573 | if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
|
---|
| 574 | &source_lsa->u.sa, source_lsa->len))
|
---|
| 575 | bb_error_msg_and_die("can't set multicast source interface");
|
---|
| 576 | xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
|
---|
| 577 | }
|
---|
| 578 | if (str_I)
|
---|
| 579 | setsockopt_bindtodevice(pingsock, str_I);
|
---|
| 580 |
|
---|
| 581 | /* enable broadcast pings */
|
---|
| 582 | setsockopt_broadcast(pingsock);
|
---|
| 583 |
|
---|
| 584 | /* set recv buf (needed if we can get lots of responses: flood ping,
|
---|
| 585 | * broadcast ping etc) */
|
---|
| 586 | sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
|
---|
| 587 | setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
|
---|
| 588 |
|
---|
| 589 | signal(SIGINT, print_stats_and_exit);
|
---|
| 590 |
|
---|
| 591 | /* start the ping's going ... */
|
---|
| 592 | sendping4(0);
|
---|
| 593 |
|
---|
| 594 | /* listen for replies */
|
---|
| 595 | while (1) {
|
---|
| 596 | struct sockaddr_in from;
|
---|
| 597 | socklen_t fromlen = (socklen_t) sizeof(from);
|
---|
| 598 | int c;
|
---|
| 599 |
|
---|
| 600 | c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
|
---|
| 601 | (struct sockaddr *) &from, &fromlen);
|
---|
| 602 | if (c < 0) {
|
---|
| 603 | if (errno != EINTR)
|
---|
| 604 | bb_perror_msg("recvfrom");
|
---|
| 605 | continue;
|
---|
| 606 | }
|
---|
| 607 | unpack4(G.rcv_packet, c, &from);
|
---|
| 608 | if (pingcount && nreceived >= pingcount)
|
---|
| 609 | break;
|
---|
| 610 | }
|
---|
| 611 | }
|
---|
| 612 | #if ENABLE_PING6
|
---|
| 613 | extern int BUG_bad_offsetof_icmp6_cksum(void);
|
---|
| 614 | static void ping6(len_and_sockaddr *lsa)
|
---|
| 615 | {
|
---|
| 616 | int sockopt;
|
---|
| 617 | struct msghdr msg;
|
---|
| 618 | struct sockaddr_in6 from;
|
---|
| 619 | struct iovec iov;
|
---|
| 620 | char control_buf[CMSG_SPACE(36)];
|
---|
| 621 |
|
---|
| 622 | pingsock = create_icmp6_socket();
|
---|
| 623 | pingaddr.sin6 = lsa->u.sin6;
|
---|
| 624 | /* untested whether "-I addr" really works for IPv6: */
|
---|
| 625 | if (source_lsa)
|
---|
| 626 | xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
|
---|
| 627 | if (str_I)
|
---|
| 628 | setsockopt_bindtodevice(pingsock, str_I);
|
---|
| 629 |
|
---|
| 630 | #ifdef ICMP6_FILTER
|
---|
| 631 | {
|
---|
| 632 | struct icmp6_filter filt;
|
---|
| 633 | if (!(option_mask32 & OPT_VERBOSE)) {
|
---|
| 634 | ICMP6_FILTER_SETBLOCKALL(&filt);
|
---|
| 635 | ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
|
---|
| 636 | } else {
|
---|
| 637 | ICMP6_FILTER_SETPASSALL(&filt);
|
---|
| 638 | }
|
---|
| 639 | if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
|
---|
| 640 | sizeof(filt)) < 0)
|
---|
| 641 | bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
|
---|
| 642 | }
|
---|
| 643 | #endif /*ICMP6_FILTER*/
|
---|
| 644 |
|
---|
| 645 | /* enable broadcast pings */
|
---|
| 646 | setsockopt_broadcast(pingsock);
|
---|
| 647 |
|
---|
| 648 | /* set recv buf (needed if we can get lots of responses: flood ping,
|
---|
| 649 | * broadcast ping etc) */
|
---|
| 650 | sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
|
---|
| 651 | setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
|
---|
| 652 |
|
---|
| 653 | sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
|
---|
| 654 | if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
|
---|
| 655 | BUG_bad_offsetof_icmp6_cksum();
|
---|
| 656 | setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
|
---|
| 657 |
|
---|
| 658 | /* request ttl info to be returned in ancillary data */
|
---|
| 659 | setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
|
---|
| 660 |
|
---|
| 661 | if (if_index)
|
---|
| 662 | pingaddr.sin6.sin6_scope_id = if_index;
|
---|
| 663 |
|
---|
| 664 | signal(SIGINT, print_stats_and_exit);
|
---|
| 665 |
|
---|
| 666 | /* start the ping's going ... */
|
---|
| 667 | sendping6(0);
|
---|
| 668 |
|
---|
| 669 | /* listen for replies */
|
---|
| 670 | msg.msg_name = &from;
|
---|
| 671 | msg.msg_namelen = sizeof(from);
|
---|
| 672 | msg.msg_iov = &iov;
|
---|
| 673 | msg.msg_iovlen = 1;
|
---|
| 674 | msg.msg_control = control_buf;
|
---|
| 675 | iov.iov_base = G.rcv_packet;
|
---|
| 676 | iov.iov_len = G.sizeof_rcv_packet;
|
---|
| 677 | while (1) {
|
---|
| 678 | int c;
|
---|
| 679 | struct cmsghdr *mp;
|
---|
| 680 | int hoplimit = -1;
|
---|
| 681 | msg.msg_controllen = sizeof(control_buf);
|
---|
| 682 |
|
---|
| 683 | c = recvmsg(pingsock, &msg, 0);
|
---|
| 684 | if (c < 0) {
|
---|
| 685 | if (errno != EINTR)
|
---|
| 686 | bb_perror_msg("recvfrom");
|
---|
| 687 | continue;
|
---|
| 688 | }
|
---|
| 689 | for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
|
---|
| 690 | if (mp->cmsg_level == SOL_IPV6
|
---|
| 691 | && mp->cmsg_type == IPV6_HOPLIMIT
|
---|
| 692 | /* don't check len - we trust the kernel: */
|
---|
| 693 | /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
|
---|
| 694 | ) {
|
---|
| 695 | /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
|
---|
| 696 | move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
|
---|
| 697 | }
|
---|
| 698 | }
|
---|
| 699 | unpack6(G.rcv_packet, c, /*&from,*/ hoplimit);
|
---|
| 700 | if (pingcount && nreceived >= pingcount)
|
---|
| 701 | break;
|
---|
| 702 | }
|
---|
| 703 | }
|
---|
| 704 | #endif
|
---|
| 705 |
|
---|
| 706 | static void ping(len_and_sockaddr *lsa)
|
---|
| 707 | {
|
---|
| 708 | printf("PING %s (%s)", hostname, dotted);
|
---|
| 709 | if (source_lsa) {
|
---|
| 710 | printf(" from %s",
|
---|
| 711 | xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
|
---|
| 712 | }
|
---|
| 713 | printf(": %d data bytes\n", datalen);
|
---|
| 714 |
|
---|
| 715 | G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
|
---|
| 716 | G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
|
---|
| 717 | #if ENABLE_PING6
|
---|
| 718 | if (lsa->u.sa.sa_family == AF_INET6) {
|
---|
| 719 | /* +4 reserves a place for timestamp, which may end up sitting
|
---|
| 720 | * _after_ packet. Saves one if() - see sendping4/6() */
|
---|
| 721 | G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
|
---|
| 722 | ping6(lsa);
|
---|
| 723 | } else
|
---|
| 724 | #endif
|
---|
| 725 | {
|
---|
| 726 | G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
|
---|
| 727 | ping4(lsa);
|
---|
| 728 | }
|
---|
| 729 | }
|
---|
| 730 |
|
---|
| 731 | static int common_ping_main(int opt, char **argv)
|
---|
| 732 | {
|
---|
| 733 | len_and_sockaddr *lsa;
|
---|
| 734 | char *str_s;
|
---|
| 735 |
|
---|
| 736 | INIT_G();
|
---|
| 737 |
|
---|
| 738 | /* exactly one argument needed; -v and -q don't mix; -c NUM, -w NUM, -W NUM */
|
---|
| 739 | opt_complementary = "=1:q--v:v--q:c+:w+:W+";
|
---|
| 740 | opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &deadline, &timeout, &str_I);
|
---|
| 741 | if (opt & OPT_s)
|
---|
| 742 | datalen = xatou16(str_s); // -s
|
---|
| 743 | if (opt & OPT_I) { // -I
|
---|
| 744 | if_index = if_nametoindex(str_I);
|
---|
| 745 | if (!if_index) {
|
---|
| 746 | /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
|
---|
| 747 | source_lsa = xdotted2sockaddr(str_I, 0);
|
---|
| 748 | str_I = NULL; /* don't try to bind to device later */
|
---|
| 749 | }
|
---|
| 750 | }
|
---|
| 751 | myid = (uint16_t) getpid();
|
---|
| 752 | hostname = argv[optind];
|
---|
| 753 | #if ENABLE_PING6
|
---|
| 754 | {
|
---|
| 755 | sa_family_t af = AF_UNSPEC;
|
---|
| 756 | if (opt & OPT_IPV4)
|
---|
| 757 | af = AF_INET;
|
---|
| 758 | if (opt & OPT_IPV6)
|
---|
| 759 | af = AF_INET6;
|
---|
| 760 | lsa = xhost_and_af2sockaddr(hostname, 0, af);
|
---|
| 761 | }
|
---|
| 762 | #else
|
---|
| 763 | lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
|
---|
| 764 | #endif
|
---|
| 765 |
|
---|
| 766 | if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
|
---|
| 767 | /* leaking it here... */
|
---|
| 768 | source_lsa = NULL;
|
---|
| 769 |
|
---|
| 770 | dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
|
---|
| 771 | ping(lsa);
|
---|
| 772 | print_stats_and_exit(EXIT_SUCCESS);
|
---|
| 773 | /*return EXIT_SUCCESS;*/
|
---|
| 774 | }
|
---|
| 775 | #endif /* FEATURE_FANCY_PING */
|
---|
| 776 |
|
---|
| 777 |
|
---|
| 778 | int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 779 | int ping_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 780 | {
|
---|
| 781 | #if !ENABLE_FEATURE_FANCY_PING
|
---|
| 782 | return common_ping_main(AF_UNSPEC, argv);
|
---|
| 783 | #else
|
---|
| 784 | return common_ping_main(0, argv);
|
---|
| 785 | #endif
|
---|
| 786 | }
|
---|
| 787 |
|
---|
| 788 | #if ENABLE_PING6
|
---|
| 789 | int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 790 | int ping6_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 791 | {
|
---|
| 792 | # if !ENABLE_FEATURE_FANCY_PING
|
---|
| 793 | return common_ping_main(AF_INET6, argv);
|
---|
| 794 | # else
|
---|
| 795 | return common_ping_main(OPT_IPV6, argv);
|
---|
| 796 | # endif
|
---|
| 797 | }
|
---|
| 798 | #endif
|
---|
| 799 |
|
---|
| 800 | /* from ping6.c:
|
---|
| 801 | * Copyright (c) 1989 The Regents of the University of California.
|
---|
| 802 | * All rights reserved.
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| 803 | *
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| 804 | * This code is derived from software contributed to Berkeley by
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| 805 | * Mike Muuss.
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| 806 | *
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| 807 | * Redistribution and use in source and binary forms, with or without
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| 808 | * modification, are permitted provided that the following conditions
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| 809 | * are met:
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| 810 | * 1. Redistributions of source code must retain the above copyright
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| 811 | * notice, this list of conditions and the following disclaimer.
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| 812 | * 2. Redistributions in binary form must reproduce the above copyright
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| 813 | * notice, this list of conditions and the following disclaimer in the
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| 814 | * documentation and/or other materials provided with the distribution.
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| 815 | *
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| 816 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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| 817 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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| 818 | *
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| 819 | * 4. Neither the name of the University nor the names of its contributors
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| 820 | * may be used to endorse or promote products derived from this software
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| 821 | * without specific prior written permission.
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| 822 | *
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| 823 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 824 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 825 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 826 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 827 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 828 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 829 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 830 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 831 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 832 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 833 | * SUCH DAMAGE.
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| 834 | */
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