* This code is derived from software contributed to Berkeley by
* Mike Muuss.
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* from ping6.c:
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
#include <netinet/ip_icmp.h>
#include "libbb.h"
+//config:config PING
+//config: bool "ping"
+//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"
+//config: default y
+//config: depends on FEATURE_IPV6 && PING
+//config: help
+//config: This will give you a ping that can talk IPv6.
+//config:
+//config:config FEATURE_FANCY_PING
+//config: bool "Enable fancy ping output"
+//config: default y
+//config: depends on PING
+//config: help
+//config: Make the output from the ping applet include statistics, and at the
+//config: same time provide full support for ICMP packets.
+
+/* 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: "\nOptions:"
+//usage: "\n -4,-6 Force IP or IPv6 name resolution"
+//usage: "\n -c CNT Send only CNT pings"
+//usage: "\n -s SIZE Send SIZE data bytes in packets (default:56)"
+//usage: "\n -t TTL Set TTL"
+//usage: "\n -I IFACE/IP Use interface or IP address as source"
+//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 displays output at start"
+//usage: "\n and when finished"
+//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: "\nOptions:"
+//usage: "\n -c CNT Send only CNT pings"
+//usage: "\n -s SIZE Send SIZE data bytes in packets (default:56)"
+//usage: "\n -I IFACE/IP Use interface or IP address as source"
+//usage: "\n -q Quiet, only displays output at start"
+//usage: "\n and when finished"
+//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"
+
#if ENABLE_PING6
# include <netinet/icmp6.h>
/* I see RENUMBERED constants in bits/in.h - !!?
DEFDATALEN = 56,
MAXIPLEN = 60,
MAXICMPLEN = 76,
- MAXPACKET = 65468,
MAX_DUP_CHK = (8 * 128),
MAXWAIT = 10,
PINGINTERVAL = 1, /* 1 second */
};
-/* common routines */
+/* Common routines */
static int in_cksum(unsigned short *buf, int sz)
{
#if !ENABLE_FEATURE_FANCY_PING
-/* simple version */
+/* Simple version */
-static char *hostname;
+struct globals {
+ char *hostname;
+ char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { } while (0)
static void noresp(int ign UNUSED_PARAM)
{
- printf("No response from %s\n", hostname);
+ printf("No response from %s\n", G.hostname);
exit(EXIT_FAILURE);
}
static void ping4(len_and_sockaddr *lsa)
{
- struct sockaddr_in pingaddr;
struct icmp *pkt;
int pingsock, c;
- char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
pingsock = create_icmp_socket();
- pingaddr = lsa->u.sin;
- pkt = (struct icmp *) packet;
- memset(pkt, 0, sizeof(packet));
+ pkt = (struct icmp *) G.packet;
+ memset(pkt, 0, sizeof(G.packet));
pkt->icmp_type = ICMP_ECHO;
- pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
+ pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(G.packet));
- c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN,
- (struct sockaddr *) &pingaddr, sizeof(pingaddr));
+ xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
/* listen for replies */
while (1) {
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
- c = recvfrom(pingsock, packet, sizeof(packet), 0,
+ c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
(struct sockaddr *) &from, &fromlen);
if (c < 0) {
if (errno != EINTR)
continue;
}
if (c >= 76) { /* ip + icmp */
- struct iphdr *iphdr = (struct iphdr *) packet;
+ struct iphdr *iphdr = (struct iphdr *) G.packet;
- pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
+ pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */
if (pkt->icmp_type == ICMP_ECHOREPLY)
break;
}
#if ENABLE_PING6
static void ping6(len_and_sockaddr *lsa)
{
- struct sockaddr_in6 pingaddr;
struct icmp6_hdr *pkt;
int pingsock, c;
int sockopt;
- char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
pingsock = create_icmp6_socket();
- pingaddr = lsa->u.sin6;
- pkt = (struct icmp6_hdr *) packet;
- memset(pkt, 0, sizeof(packet));
+ pkt = (struct icmp6_hdr *) G.packet;
+ memset(pkt, 0, sizeof(G.packet));
pkt->icmp6_type = ICMP6_ECHO_REQUEST;
sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
- c = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr),
- (struct sockaddr *) &pingaddr, sizeof(pingaddr));
+ xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
/* listen for replies */
while (1) {
struct sockaddr_in6 from;
socklen_t fromlen = sizeof(from);
- c = recvfrom(pingsock, packet, sizeof(packet), 0,
+ c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
(struct sockaddr *) &from, &fromlen);
if (c < 0) {
if (errno != EINTR)
continue;
}
if (c >= ICMP_MINLEN) { /* icmp6_hdr */
- pkt = (struct icmp6_hdr *) packet;
+ pkt = (struct icmp6_hdr *) G.packet;
if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
break;
}
{
len_and_sockaddr *lsa;
+ INIT_G();
+
#if ENABLE_PING6
while ((++argv)[0] && argv[0][0] == '-') {
if (argv[0][1] == '4') {
argv++;
#endif
- hostname = *argv;
- if (!hostname)
+ G.hostname = *argv;
+ if (!G.hostname)
bb_show_usage();
#if ENABLE_PING6
- lsa = xhost_and_af2sockaddr(hostname, 0, af);
+ lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
#else
- lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
+ lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
#endif
/* Set timer _after_ DNS resolution */
signal(SIGALRM, noresp);
else
#endif
ping4(lsa);
- printf("%s is alive!\n", hostname);
+ printf("%s is alive!\n", G.hostname);
return EXIT_SUCCESS;
}
#else /* FEATURE_FANCY_PING */
-/* full(er) version */
+/* Full(er) version */
-#define OPT_STRING ("qvc:s:w:W:I:4" IF_PING6("6"))
+#define OPT_STRING ("qvc:s:t:w:W:I:4" IF_PING6("6"))
enum {
OPT_QUIET = 1 << 0,
OPT_VERBOSE = 1 << 1,
OPT_c = 1 << 2,
OPT_s = 1 << 3,
- OPT_w = 1 << 4,
- OPT_W = 1 << 5,
- OPT_I = 1 << 6,
- OPT_IPV4 = 1 << 7,
- OPT_IPV6 = (1 << 8) * ENABLE_PING6,
+ OPT_t = 1 << 4,
+ OPT_w = 1 << 5,
+ OPT_W = 1 << 6,
+ OPT_I = 1 << 7,
+ OPT_IPV4 = 1 << 8,
+ OPT_IPV6 = (1 << 9) * ENABLE_PING6,
};
len_and_sockaddr *source_lsa;
unsigned datalen;
unsigned pingcount; /* must be int-sized */
+ unsigned opt_ttl;
unsigned long ntransmitted, nreceived, nrepeats;
uint16_t myid;
unsigned tmin, tmax; /* in us */
unsigned deadline;
unsigned timeout;
unsigned total_secs;
+ unsigned sizeof_rcv_packet;
+ char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
+ void *snd_packet; /* [datalen + ipv4/ipv6_const] */
const char *hostname;
const char *dotted;
union {
#define nreceived (G.nreceived )
#define nrepeats (G.nrepeats )
#define pingcount (G.pingcount )
+#define opt_ttl (G.opt_ttl )
#define myid (G.myid )
#define tmin (G.tmin )
#define tmax (G.tmax )
} while (0)
-#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
-#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
-#define SET(bit) (A(bit) |= B(bit))
-#define CLR(bit) (A(bit) &= (~B(bit)))
-#define TST(bit) (A(bit) & B(bit))
+#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
+#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
+#define SET(bit) (A(bit) |= B(bit))
+#define CLR(bit) (A(bit) &= (~B(bit)))
+#define TST(bit) (A(bit) & B(bit))
/**************************************************************************/
exit(nreceived == 0 || (deadline && nreceived < pingcount));
}
-static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
+static void sendping_tail(void (*sp)(int), int size_pkt)
{
int sz;
CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
ntransmitted++;
+ size_pkt += datalen;
+
/* sizeof(pingaddr) can be larger than real sa size, but I think
* it doesn't matter */
- sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr));
+ 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);
static void sendping4(int junk UNUSED_PARAM)
{
- /* +4 reserves a place for timestamp, which may end up sitting
- * *after* packet. Saves one if() */
- struct icmp *pkt = alloca(datalen + ICMP_MINLEN + 4);
+ struct icmp *pkt = G.snd_packet;
- memset(pkt, 0, datalen + ICMP_MINLEN + 4);
+ //memset(pkt, 0, datalen + ICMP_MINLEN + 4); - G.snd_packet was xzalloced
pkt->icmp_type = ICMP_ECHO;
/*pkt->icmp_code = 0;*/
- /*pkt->icmp_cksum = 0;*/
+ pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
pkt->icmp_id = myid;
- /* We don't do hton, because we will read it back on the same machine */
+ /* 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 = monotonic_us();
pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
- sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
+ sendping_tail(sendping4, ICMP_MINLEN);
}
#if ENABLE_PING6
static void sendping6(int junk UNUSED_PARAM)
{
- struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr) + 4);
+ struct icmp6_hdr *pkt = G.snd_packet;
- memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
+ //memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
pkt->icmp6_type = ICMP6_ECHO_REQUEST;
/*pkt->icmp6_code = 0;*/
/*pkt->icmp6_cksum = 0;*/
/*if (datalen >= 4)*/
*(uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
- sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
+ //TODO? pkt->icmp_cksum = in_cksum(...);
+
+ sendping_tail(sendping6, sizeof(struct icmp6_hdr));
}
#endif
static void ping4(len_and_sockaddr *lsa)
{
- char packet[datalen + MAXIPLEN + MAXICMPLEN];
int sockopt;
pingsock = create_icmp_socket();
sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
+ if (opt_ttl != 0) {
+ setsockopt(pingsock, IPPROTO_IP, IP_TTL, &opt_ttl, sizeof(opt_ttl));
+ /* above doesnt affect packets sent to bcast IP, so... */
+ setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
+ }
+
signal(SIGINT, print_stats_and_exit);
/* start the ping's going ... */
socklen_t fromlen = (socklen_t) sizeof(from);
int c;
- c = recvfrom(pingsock, packet, sizeof(packet), 0,
+ 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;
}
- unpack4(packet, c, &from);
+ unpack4(G.rcv_packet, c, &from);
if (pingcount && nreceived >= pingcount)
break;
}
extern int BUG_bad_offsetof_icmp6_cksum(void);
static void ping6(len_and_sockaddr *lsa)
{
- char packet[datalen + MAXIPLEN + MAXICMPLEN];
int sockopt;
struct msghdr msg;
struct sockaddr_in6 from;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = control_buf;
- iov.iov_base = packet;
- iov.iov_len = sizeof(packet);
+ iov.iov_base = G.rcv_packet;
+ iov.iov_len = G.sizeof_rcv_packet;
while (1) {
int c;
struct cmsghdr *mp;
move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
}
}
- unpack6(packet, c, /*&from,*/ hoplimit);
+ unpack6(G.rcv_packet, c, /*&from,*/ hoplimit);
if (pingcount && nreceived >= pingcount)
break;
}
}
printf(": %d data bytes\n", datalen);
+ 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)
+ 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
+ } else
#endif
+ {
+ G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
ping4(lsa);
+ }
}
static int common_ping_main(int opt, char **argv)
INIT_G();
- /* exactly one argument needed; -v and -q don't mix; -c NUM, -w NUM, -W NUM */
- opt_complementary = "=1:q--v:v--q:c+:w+:W+";
- opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &deadline, &timeout, &str_I);
+ /* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
+ opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
+ opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I);
if (opt & OPT_s)
datalen = xatou16(str_s); // -s
if (opt & OPT_I) { // -I
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