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busybox/networking/ping.c
Denys Vlasenko 36d198ec6d ping: implement -i SEC 
function                                             old     new   delta
common_ping_main                                    1862    1968    +106
ualarm                                                 -      79     +79
packed_usage                                       32858   32897     +39
sendping_tail                                        204     218     +14
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 3/0 up/down: 320/0)             Total: 320 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-08-03 18:50:50 +02:00

1010 lines
28 KiB
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/* vi: set sw=4 ts=4: */
/*
* Mini ping implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* Adapted from the ping in netkit-base 0.10:
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Muuss.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* from ping6.c:
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* This version of ping is adapted from the ping in netkit-base 0.10,
* which is:
*
* Original copyright notice is retained at the end of this file.
*
* This version is an adaptation of ping.c from busybox.
* The code was modified by Bart Visscher <magick@linux-fan.com>
*/
//config:config PING
//config: bool "ping (9.5 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
//config: elicit an ICMP ECHO_RESPONSE from a host or gateway.
//config:
//config:config PING6
//config: bool "ping6 (10 kb)"
//config: default y
//config: depends on FEATURE_IPV6
//config: help
//config: Alias to "ping -6".
//config:
//config:config FEATURE_FANCY_PING
//config: bool "Enable fancy ping output"
//config: default y
//config: depends on PING || PING6
//config: help
//config: With this option off, ping will say "HOST is alive!"
//config: or terminate with SIGALRM in 5 seconds otherwise.
//config: No command-line options will be recognized.
/* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */
//applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE))
//applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE))
//kbuild:lib-$(CONFIG_PING) += ping.o
//kbuild:lib-$(CONFIG_PING6) += ping.o
//usage:#if !ENABLE_FEATURE_FANCY_PING
//usage:# define ping_trivial_usage
//usage: "HOST"
//usage:# define ping_full_usage "\n\n"
//usage: "Send ICMP ECHO_REQUEST packets to network hosts"
//usage:# define ping6_trivial_usage
//usage: "HOST"
//usage:# define ping6_full_usage "\n\n"
//usage: "Send ICMP ECHO_REQUEST packets to network hosts"
//usage:#else
//usage:# define ping_trivial_usage
//usage: "[OPTIONS] HOST"
//usage:# define ping_full_usage "\n\n"
//usage: "Send ICMP ECHO_REQUEST packets to network hosts\n"
//usage: IF_PING6(
//usage: "\n -4,-6 Force IP or IPv6 name resolution"
//usage: )
//usage: "\n -c CNT Send only CNT pings"
//usage: "\n -s SIZE Send SIZE data bytes in packets (default 56)"
//usage: "\n -i SECS Interval"
//usage: "\n -A Ping as soon as reply is recevied"
//usage: "\n -t TTL Set TTL"
//usage: "\n -I IFACE/IP Source interface or IP address"
//usage: "\n -W SEC Seconds to wait for the first response (default 10)"
//usage: "\n (after all -c CNT packets are sent)"
//usage: "\n -w SEC Seconds until ping exits (default:infinite)"
//usage: "\n (can exit earlier with -c CNT)"
//usage: "\n -q Quiet, only display output at start"
//usage: "\n and when finished"
//usage: "\n -p HEXBYTE Pattern to use for payload"
//usage:
//usage:# define ping6_trivial_usage
//usage: "[OPTIONS] HOST"
//usage:# define ping6_full_usage "\n\n"
//usage: "Send ICMP ECHO_REQUEST packets to network hosts\n"
//usage: "\n -c CNT Send only CNT pings"
//usage: "\n -s SIZE Send SIZE data bytes in packets (default 56)"
//usage: "\n -i SECS Interval"
//usage: "\n -A Ping as soon as reply is recevied"
//usage: "\n -I IFACE/IP Source interface or IP address"
//usage: "\n -q Quiet, only display output at start"
//usage: "\n and when finished"
//usage: "\n -p HEXBYTE Pattern to use for payload"
//usage:
//usage:#endif
//usage:
//usage:#define ping_example_usage
//usage: "$ ping localhost\n"
//usage: "PING slag (127.0.0.1): 56 data bytes\n"
//usage: "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
//usage: "\n"
//usage: "--- debian ping statistics ---\n"
//usage: "1 packets transmitted, 1 packets received, 0% packet loss\n"
//usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
//usage:#define ping6_example_usage
//usage: "$ ping6 ip6-localhost\n"
//usage: "PING ip6-localhost (::1): 56 data bytes\n"
//usage: "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
//usage: "\n"
//usage: "--- ip6-localhost ping statistics ---\n"
//usage: "1 packets transmitted, 1 packets received, 0% packet loss\n"
//usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
#include <net/if.h>
#include <netinet/ip_icmp.h>
#include "libbb.h"
#include "common_bufsiz.h"
#ifdef __BIONIC__
/* should be in netinet/ip_icmp.h */
# define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
# define ICMP_SOURCE_QUENCH 4 /* Source Quench */
# define ICMP_REDIRECT 5 /* Redirect (change route) */
# define ICMP_ECHO 8 /* Echo Request */
# define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
# define ICMP_PARAMETERPROB 12 /* Parameter Problem */
# define ICMP_TIMESTAMP 13 /* Timestamp Request */
# define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
# define ICMP_INFO_REQUEST 15 /* Information Request */
# define ICMP_INFO_REPLY 16 /* Information Reply */
# define ICMP_ADDRESS 17 /* Address Mask Request */
# define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
#endif
/* Some operating systems, like GNU/Hurd, don't define SOL_RAW, but do have
* IPPROTO_RAW. Since the IPPROTO definitions are also valid to use for
* setsockopt (and take the same value as their corresponding SOL definitions,
* if they exist), we can just fall back on IPPROTO_RAW. */
#ifndef SOL_RAW
# define SOL_RAW IPPROTO_RAW
#endif
#if ENABLE_PING6
# include <netinet/icmp6.h>
/* I see RENUMBERED constants in bits/in.h - !!?
* What a fuck is going on with libc? Is it a glibc joke? */
# ifdef IPV6_2292HOPLIMIT
# undef IPV6_HOPLIMIT
# define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
# endif
#endif
enum {
DEFDATALEN = 56,
MAXIPLEN = 60,
MAXICMPLEN = 76,
MAX_DUP_CHK = (8 * 128),
MAXWAIT = 10,
PINGINTERVAL = 1, /* 1 second */
pingsock = 0,
};
static void
#if ENABLE_PING6
create_icmp_socket(len_and_sockaddr *lsa)
#else
create_icmp_socket(void)
#define create_icmp_socket(lsa) create_icmp_socket()
#endif
{
int sock;
#if ENABLE_PING6
if (lsa->u.sa.sa_family == AF_INET6)
sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
else
#endif
sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
if (sock < 0) {
if (errno == EPERM)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
}
xmove_fd(sock, pingsock);
}
#if !ENABLE_FEATURE_FANCY_PING
/* Simple version */
struct globals {
char *hostname;
char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
uint16_t myid;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
static void noresp(int ign UNUSED_PARAM)
{
printf("No response from %s\n", G.hostname);
exit(EXIT_FAILURE);
}
static void ping4(len_and_sockaddr *lsa)
{
struct icmp *pkt;
int c;
pkt = (struct icmp *) G.packet;
/*memset(pkt, 0, sizeof(G.packet)); already is */
pkt->icmp_type = ICMP_ECHO;
pkt->icmp_id = G.myid;
pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));
xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
/* listen for replies */
while (1) {
#if 0
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
(struct sockaddr *) &from, &fromlen);
#else
c = recv(pingsock, G.packet, sizeof(G.packet), 0);
#endif
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
if (c >= 76) { /* ip + icmp */
struct iphdr *iphdr = (struct iphdr *) G.packet;
pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */
if (pkt->icmp_id != G.myid)
continue; /* not our ping */
if (pkt->icmp_type == ICMP_ECHOREPLY)
break;
}
}
}
#if ENABLE_PING6
static void ping6(len_and_sockaddr *lsa)
{
struct icmp6_hdr *pkt;
int c;
int sockopt;
pkt = (struct icmp6_hdr *) G.packet;
/*memset(pkt, 0, sizeof(G.packet)); already is */
pkt->icmp6_type = ICMP6_ECHO_REQUEST;
pkt->icmp6_id = G.myid;
sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);
xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
/* listen for replies */
while (1) {
#if 0
struct sockaddr_in6 from;
socklen_t fromlen = sizeof(from);
c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
(struct sockaddr *) &from, &fromlen);
#else
c = recv(pingsock, G.packet, sizeof(G.packet), 0);
#endif
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
if (c >= ICMP_MINLEN) { /* icmp6_hdr */
if (pkt->icmp6_id != G.myid)
continue; /* not our ping */
if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
break;
}
}
}
#endif
#if !ENABLE_PING6
# define common_ping_main(af, argv) common_ping_main(argv)
#endif
static int common_ping_main(sa_family_t af, char **argv)
{
len_and_sockaddr *lsa;
INIT_G();
#if ENABLE_PING6
while ((++argv)[0] && argv[0][0] == '-') {
if (argv[0][1] == '4') {
af = AF_INET;
continue;
}
if (argv[0][1] == '6') {
af = AF_INET6;
continue;
}
bb_show_usage();
}
#else
argv++;
#endif
G.hostname = *argv;
if (!G.hostname)
bb_show_usage();
#if ENABLE_PING6
lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
#else
lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
#endif
/* Set timer _after_ DNS resolution */
signal(SIGALRM, noresp);
alarm(5); /* give the host 5000ms to respond */
create_icmp_socket(lsa);
G.myid = (uint16_t) getpid();
#if ENABLE_PING6
if (lsa->u.sa.sa_family == AF_INET6)
ping6(lsa);
else
#endif
ping4(lsa);
if (ENABLE_FEATURE_CLEAN_UP)
close(pingsock);
printf("%s is alive!\n", G.hostname);
return EXIT_SUCCESS;
}
#else /* FEATURE_FANCY_PING */
/* Full(er) version */
/* -c NUM, -t NUM, -w NUM, -W NUM */
#define OPT_STRING "qvAc:+s:t:+w:+W:+I:np:i:4"IF_PING6("6")
enum {
OPT_QUIET = 1 << 0,
OPT_VERBOSE = 1 << 1,
OPT_A = 1 << 2,
OPT_c = 1 << 3,
OPT_s = 1 << 4,
OPT_t = 1 << 5,
OPT_w = 1 << 6,
OPT_W = 1 << 7,
OPT_I = 1 << 8,
/*OPT_n = 1 << 9, - ignored */
OPT_p = 1 << 10,
OPT_i = 1 << 11,
OPT_IPV4 = 1 << 12,
OPT_IPV6 = (1 << 13) * ENABLE_PING6,
};
struct globals {
int if_index;
char *str_I;
len_and_sockaddr *source_lsa;
unsigned datalen;
unsigned pingcount; /* must be int-sized */
unsigned opt_ttl;
unsigned long ntransmitted, nreceived, nrepeats;
uint16_t myid;
uint8_t pattern;
unsigned tmin, tmax; /* in us */
unsigned long long tsum; /* in us, sum of all times */
unsigned cur_us; /* low word only, we don't need more */
unsigned deadline_us;
unsigned interval_us;
unsigned timeout;
unsigned sizeof_rcv_packet;
char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
void *snd_packet; /* [datalen + ipv4/ipv6_const] */
const char *hostname;
const char *dotted;
union {
struct sockaddr sa;
struct sockaddr_in sin;
#if ENABLE_PING6
struct sockaddr_in6 sin6;
#endif
} pingaddr;
unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define if_index (G.if_index )
#define source_lsa (G.source_lsa )
#define str_I (G.str_I )
#define datalen (G.datalen )
#define pingcount (G.pingcount )
#define opt_ttl (G.opt_ttl )
#define myid (G.myid )
#define tmin (G.tmin )
#define tmax (G.tmax )
#define tsum (G.tsum )
#define timeout (G.timeout )
#define hostname (G.hostname )
#define dotted (G.dotted )
#define pingaddr (G.pingaddr )
#define rcvd_tbl (G.rcvd_tbl )
#define INIT_G() do { \
setup_common_bufsiz(); \
BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
datalen = DEFDATALEN; \
timeout = MAXWAIT; \
tmin = UINT_MAX; \
} while (0)
#define BYTE(bit) rcvd_tbl[(bit)>>3]
#define MASK(bit) (1 << ((bit) & 7))
#define SET(bit) (BYTE(bit) |= MASK(bit))
#define CLR(bit) (BYTE(bit) &= (~MASK(bit)))
#define TST(bit) (BYTE(bit) & MASK(bit))
static void print_stats_and_exit(int junk) NORETURN;
static void print_stats_and_exit(int junk UNUSED_PARAM)
{
unsigned long ul;
unsigned long nrecv;
signal(SIGINT, SIG_IGN);
nrecv = G.nreceived;
printf("\n--- %s ping statistics ---\n"
"%lu packets transmitted, "
"%lu packets received, ",
hostname, G.ntransmitted, nrecv
);
if (G.nrepeats)
printf("%lu duplicates, ", G.nrepeats);
ul = G.ntransmitted;
if (ul != 0)
ul = (ul - nrecv) * 100 / ul;
printf("%lu%% packet loss\n", ul);
if (tmin != UINT_MAX) {
unsigned tavg = tsum / (nrecv + G.nrepeats);
printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
tmin / 1000, tmin % 1000,
tavg / 1000, tavg % 1000,
tmax / 1000, tmax % 1000);
}
/* if condition is true, exit with 1 -- 'failure' */
exit(nrecv == 0 || (G.deadline_us && nrecv < pingcount));
}
static void sendping_tail(void (*sp)(int), int size_pkt)
{
int sz;
CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK);
G.ntransmitted++;
size_pkt += datalen;
if (G.deadline_us) {
unsigned n = G.cur_us - G.deadline_us;
if ((int)n >= 0)
print_stats_and_exit(0);
}
/* sizeof(pingaddr) can be larger than real sa size, but I think
* it doesn't matter */
sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
if (sz != size_pkt)
bb_error_msg_and_die(bb_msg_write_error);
if (pingcount == 0 || G.ntransmitted < pingcount) {
/* Didn't send all pings yet - schedule next in 1s */
signal(SIGALRM, sp);
ualarm(G.interval_us, 0);
} else { /* -c NN, and all NN are sent */
/* Wait for the last ping to come back.
* -W timeout: wait for a response in seconds.
* Affects only timeout in absence of any responses,
* otherwise ping waits for two RTTs. */
unsigned expire = timeout;
if (G.nreceived) {
/* approx. 2*tmax, in seconds (2 RTT) */
expire = tmax / (512*1024);
if (expire == 0)
expire = 1;
}
signal(SIGALRM, print_stats_and_exit);
alarm(expire);
}
}
static void sendping4(int junk UNUSED_PARAM)
{
struct icmp *pkt = G.snd_packet;
memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4);
pkt->icmp_type = ICMP_ECHO;
/*pkt->icmp_code = 0;*/
pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
pkt->icmp_id = myid;
/* If datalen < 4, we store timestamp _past_ the packet,
* but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
*/
/*if (datalen >= 4)*/
/* No hton: we'll read it back on the same machine */
*(uint32_t*)&pkt->icmp_dun = G.cur_us = monotonic_us();
pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
sendping_tail(sendping4, ICMP_MINLEN);
}
#if ENABLE_PING6
static void sendping6(int junk UNUSED_PARAM)
{
struct icmp6_hdr *pkt = G.snd_packet;
memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4);
pkt->icmp6_type = ICMP6_ECHO_REQUEST;
/*pkt->icmp6_code = 0;*/
/*pkt->icmp6_cksum = 0;*/
pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
pkt->icmp6_id = myid;
/*if (datalen >= 4)*/
*(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = G.cur_us = monotonic_us();
//TODO? pkt->icmp_cksum = inet_cksum(...);
sendping_tail(sendping6, sizeof(struct icmp6_hdr));
}
#endif
static const char *icmp_type_name(int id)
{
switch (id) {
case ICMP_ECHOREPLY: return "Echo Reply";
case ICMP_DEST_UNREACH: return "Destination Unreachable";
case ICMP_SOURCE_QUENCH: return "Source Quench";
case ICMP_REDIRECT: return "Redirect (change route)";
case ICMP_ECHO: return "Echo Request";
case ICMP_TIME_EXCEEDED: return "Time Exceeded";
case ICMP_PARAMETERPROB: return "Parameter Problem";
case ICMP_TIMESTAMP: return "Timestamp Request";
case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
case ICMP_INFO_REQUEST: return "Information Request";
case ICMP_INFO_REPLY: return "Information Reply";
case ICMP_ADDRESS: return "Address Mask Request";
case ICMP_ADDRESSREPLY: return "Address Mask Reply";
default: return "unknown ICMP type";
}
}
#if ENABLE_PING6
/* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
* the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
#ifndef MLD_LISTENER_QUERY
# define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
#endif
#ifndef MLD_LISTENER_REPORT
# define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
#endif
#ifndef MLD_LISTENER_REDUCTION
# define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
#endif
static const char *icmp6_type_name(int id)
{
switch (id) {
case ICMP6_DST_UNREACH: return "Destination Unreachable";
case ICMP6_PACKET_TOO_BIG: return "Packet too big";
case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
case ICMP6_PARAM_PROB: return "Parameter Problem";
case ICMP6_ECHO_REPLY: return "Echo Reply";
case ICMP6_ECHO_REQUEST: return "Echo Request";
case MLD_LISTENER_QUERY: return "Listener Query";
case MLD_LISTENER_REPORT: return "Listener Report";
case MLD_LISTENER_REDUCTION: return "Listener Reduction";
default: return "unknown ICMP type";
}
}
#endif
static void unpack_tail(int sz, uint32_t *tp,
const char *from_str,
uint16_t recv_seq, int ttl)
{
unsigned char *b, m;
const char *dupmsg = " (DUP!)";
unsigned triptime = triptime; /* for gcc */
if (tp) {
/* (int32_t) cast is for hypothetical 64-bit unsigned */
/* (doesn't hurt 32-bit real-world anyway) */
triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
tsum += triptime;
if (triptime < tmin)
tmin = triptime;
if (triptime > tmax)
tmax = triptime;
}
b = &BYTE(recv_seq % MAX_DUP_CHK);
m = MASK(recv_seq % MAX_DUP_CHK);
/*if TST(recv_seq % MAX_DUP_CHK):*/
if (*b & m) {
++G.nrepeats;
} else {
/*SET(recv_seq % MAX_DUP_CHK):*/
*b |= m;
++G.nreceived;
dupmsg += 7;
}
if (option_mask32 & OPT_QUIET)
return;
printf("%d bytes from %s: seq=%u ttl=%d", sz,
from_str, recv_seq, ttl);
if (tp)
printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
puts(dupmsg);
fflush_all();
}
static int unpack4(char *buf, int sz, struct sockaddr_in *from)
{
struct icmp *icmppkt;
struct iphdr *iphdr;
int hlen;
/* discard if too short */
if (sz < (datalen + ICMP_MINLEN))
return 0;
/* check IP header */
iphdr = (struct iphdr *) buf;
hlen = iphdr->ihl << 2;
sz -= hlen;
icmppkt = (struct icmp *) (buf + hlen);
if (icmppkt->icmp_id != myid)
return 0; /* not our ping */
if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
uint32_t *tp = NULL;
if (sz >= ICMP_MINLEN + sizeof(uint32_t))
tp = (uint32_t *) icmppkt->icmp_data;
unpack_tail(sz, tp,
inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
recv_seq, iphdr->ttl);
return 1;
}
if (icmppkt->icmp_type != ICMP_ECHO) {
bb_error_msg("warning: got ICMP %d (%s)",
icmppkt->icmp_type,
icmp_type_name(icmppkt->icmp_type));
}
return 0;
}
#if ENABLE_PING6
static int unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
{
struct icmp6_hdr *icmppkt;
char buf[INET6_ADDRSTRLEN];
/* discard if too short */
if (sz < (datalen + sizeof(struct icmp6_hdr)))
return 0;
icmppkt = (struct icmp6_hdr *) packet;
if (icmppkt->icmp6_id != myid)
return 0; /* not our ping */
if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
uint32_t *tp = NULL;
if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
tp = (uint32_t *) &icmppkt->icmp6_data8[4];
unpack_tail(sz, tp,
inet_ntop(AF_INET6, &from->sin6_addr,
buf, sizeof(buf)),
recv_seq, hoplimit);
return 1;
}
if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
bb_error_msg("warning: got ICMP %d (%s)",
icmppkt->icmp6_type,
icmp6_type_name(icmppkt->icmp6_type));
}
return 0;
}
#endif
static void ping4(len_and_sockaddr *lsa)
{
int sockopt;
pingaddr.sin = lsa->u.sin;
if (source_lsa) {
if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
&source_lsa->u.sa, source_lsa->len))
bb_error_msg_and_die("can't set multicast source interface");
xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
}
/* enable broadcast pings */
setsockopt_broadcast(pingsock);
/* set recv buf (needed if we can get lots of responses: flood ping,
* broadcast ping etc) */
sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);
if (opt_ttl != 0) {
setsockopt_int(pingsock, IPPROTO_IP, IP_TTL, opt_ttl);
/* above doesn't affect packets sent to bcast IP, so... */
setsockopt_int(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, opt_ttl);
}
signal(SIGINT, print_stats_and_exit);
/* start the ping's going ... */
send_ping:
sendping4(0);
/* listen for replies */
while (1) {
struct sockaddr_in from;
socklen_t fromlen = (socklen_t) sizeof(from);
int c;
c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
(struct sockaddr *) &from, &fromlen);
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
c = unpack4(G.rcv_packet, c, &from);
if (pingcount && G.nreceived >= pingcount)
break;
if (c && (option_mask32 & OPT_A)) {
goto send_ping;
}
}
}
#if ENABLE_PING6
static void ping6(len_and_sockaddr *lsa)
{
int sockopt;
struct msghdr msg;
struct sockaddr_in6 from;
struct iovec iov;
char control_buf[CMSG_SPACE(36)];
pingaddr.sin6 = lsa->u.sin6;
if (source_lsa)
xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
#ifdef ICMP6_FILTER
{
struct icmp6_filter filt;
if (!(option_mask32 & OPT_VERBOSE)) {
ICMP6_FILTER_SETBLOCKALL(&filt);
ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
} else {
ICMP6_FILTER_SETPASSALL(&filt);
}
if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
sizeof(filt)) < 0)
bb_error_msg_and_die("setsockopt(%s)", "ICMP6_FILTER");
}
#endif /*ICMP6_FILTER*/
/* enable broadcast pings */
setsockopt_broadcast(pingsock);
/* set recv buf (needed if we can get lots of responses: flood ping,
* broadcast ping etc) */
sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);
sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
BUILD_BUG_ON(offsetof(struct icmp6_hdr, icmp6_cksum) != 2);
setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);
/* request ttl info to be returned in ancillary data */
setsockopt_1(pingsock, SOL_IPV6, IPV6_HOPLIMIT);
if (if_index)
pingaddr.sin6.sin6_scope_id = if_index;
signal(SIGINT, print_stats_and_exit);
msg.msg_name = &from;
msg.msg_namelen = sizeof(from);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = control_buf;
iov.iov_base = G.rcv_packet;
iov.iov_len = G.sizeof_rcv_packet;
/* start the ping's going ... */
send_ping:
sendping6(0);
/* listen for replies */
while (1) {
int c;
struct cmsghdr *mp;
int hoplimit = -1;
msg.msg_controllen = sizeof(control_buf);
c = recvmsg(pingsock, &msg, 0);
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
if (mp->cmsg_level == SOL_IPV6
&& mp->cmsg_type == IPV6_HOPLIMIT
/* don't check len - we trust the kernel: */
/* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
) {
/*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
}
}
c = unpack6(G.rcv_packet, c, &from, hoplimit);
if (pingcount && G.nreceived >= pingcount)
break;
if (c && (option_mask32 & OPT_A)) {
goto send_ping;
}
}
}
#endif
static void ping(len_and_sockaddr *lsa)
{
printf("PING %s (%s)", hostname, dotted);
if (source_lsa) {
printf(" from %s",
xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
}
printf(": %d data bytes\n", datalen);
create_icmp_socket(lsa);
/* untested whether "-I addr" really works for IPv6: */
if (str_I)
setsockopt_bindtodevice(pingsock, str_I);
G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
#if ENABLE_PING6
if (lsa->u.sa.sa_family == AF_INET6) {
/* +4 reserves a place for timestamp, which may end up sitting
* _after_ packet. Saves one if() - see sendping4/6() */
G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
ping6(lsa);
} else
#endif
{
G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
ping4(lsa);
}
}
static int common_ping_main(int opt, char **argv)
{
len_and_sockaddr *lsa;
char *str_s, *str_p;
char *str_i = (char*)"1";
duration_t interval;
INIT_G();
opt |= getopt32(argv, "^"
OPT_STRING
/* exactly one arg; -v and -q don't mix */
"\0" "=1:q--v:v--q",
&pingcount, &str_s, &opt_ttl, &G.deadline_us, &timeout, &str_I, &str_p, &str_i
);
if (opt & OPT_s)
datalen = xatou16(str_s); // -s
if (opt & OPT_I) { // -I
if_index = if_nametoindex(str_I);
if (!if_index) {
/* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
source_lsa = xdotted2sockaddr(str_I, 0);
str_I = NULL; /* don't try to bind to device later */
}
}
if (opt & OPT_p)
G.pattern = xstrtou_range(str_p, 16, 0, 255);
if (G.deadline_us) {
unsigned d = G.deadline_us < INT_MAX/1000000 ? G.deadline_us : INT_MAX/1000000;
G.deadline_us = 1 | ((d * 1000000) + monotonic_us());
}
interval = parse_duration_str(str_i);
if (interval > INT_MAX/1000000)
interval = INT_MAX/1000000;
G.interval_us = interval * 1000000;
myid = (uint16_t) getpid();
hostname = argv[optind];
#if ENABLE_PING6
{
sa_family_t af = AF_UNSPEC;
if (opt & OPT_IPV4)
af = AF_INET;
if (opt & OPT_IPV6)
af = AF_INET6;
lsa = xhost_and_af2sockaddr(hostname, 0, af);
}
#else
lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
#endif
if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
/* leaking it here... */
source_lsa = NULL;
dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
ping(lsa);
print_stats_and_exit(0);
/*return EXIT_SUCCESS;*/
}
#endif /* FEATURE_FANCY_PING */
#if ENABLE_PING
int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ping_main(int argc UNUSED_PARAM, char **argv)
{
# if !ENABLE_FEATURE_FANCY_PING
return common_ping_main(AF_UNSPEC, argv);
# else
return common_ping_main(0, argv);
# endif
}
#endif
#if ENABLE_PING6
int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ping6_main(int argc UNUSED_PARAM, char **argv)
{
# if !ENABLE_FEATURE_FANCY_PING
return common_ping_main(AF_INET6, argv);
# else
return common_ping_main(OPT_IPV6, argv);
# endif
}
#endif
/* from ping6.c:
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Muuss.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
*
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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