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ping.c
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ping.c
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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
/*
* P I N G . C
*
* Using the InterNet Control Message Protocol (ICMP) "ECHO" facility,
* measure round-trip-delays and packet loss across network paths.
*
* Author -
* Mike Muuss
* U. S. Army Ballistic Research Laboratory
* December, 1983
*
* Status -
* Public Domain. Distribution Unlimited.
* Bugs -
* More statistics could always be gathered.
* If kernel does not support non-raw ICMP sockets,
* this program has to run SUID to ROOT or with
* net_cap_raw enabled.
*/
#include "ping.h"
#include <assert.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#ifndef WITHOUT_IFADDRS
#include <ifaddrs.h>
#endif
#ifndef ICMP_FILTER
#define ICMP_FILTER 1
struct icmp_filter {
__u32 data;
};
#endif
ping_func_set_st ping4_func_set = {
.send_probe = ping4_send_probe,
.receive_error_msg = ping4_receive_error_msg,
.parse_reply = ping4_parse_reply,
.install_filter = ping4_install_filter
};
#define MAXIPLEN 60
#define MAXICMPLEN 76
#define NROUTES 9 /* number of record route slots */
#define TOS_MAX 255 /* 8-bit TOS field */
static int ts_type;
static int nroute = 0;
static __u32 route[10];
static struct sockaddr_in whereto; /* who to ping */
static int optlen = 0;
static int settos = 0; /* Set TOS, Precendence or other QOS options */
static int broadcast_pings = 0;
static void pr_options(unsigned char * cp, int hlen);
static void pr_iph(struct iphdr *ip);
static void usage(void) __attribute__((noreturn));
static unsigned short in_cksum(const unsigned short *addr, int len, unsigned short salt);
static void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp);
static int parsetos(char *str);
static struct {
struct cmsghdr cm;
struct in_pktinfo ipi;
} cmsg = { {sizeof(struct cmsghdr) + sizeof(struct in_pktinfo), SOL_IP, IP_PKTINFO},
{0, }};
int cmsg_len;
static struct sockaddr_in source = { .sin_family = AF_INET };
char *device;
static int pmtudisc = -1;
static void create_socket(socket_st *sock, int family, int socktype, int protocol, int requisite)
{
int do_fallback = 0;
errno = 0;
assert(sock->fd == -1);
assert(socktype == SOCK_DGRAM || socktype == SOCK_RAW);
/* Attempt to create a ping socket if requested. Attempt to create a raw
* socket otherwise or as a fallback. Well known errno values follow.
*
* 1) EACCES
*
* Kernel returns EACCES for all ping socket creation attempts when the
* user isn't allowed to use ping socket. A range of group ids is
* configured using the `net.ipv4.ping_group_range` sysctl. Fallback
* to raw socket is necessary.
*
* Kernel returns EACCES for all raw socket creation attempts when the
* proces doesn't have the `CAP_NET_RAW` capability.
*
* 2) EAFNOSUPPORT
*
* Kernel returns EAFNOSUPPORT for IPv6 ping or raw socket creation
* attempts when run with IPv6 support disabled (e.g. via `ipv6.disable=1`
* kernel command-line option.
*
* https://github.com/iputils/iputils/issues/32
*
* OpenVZ 2.6.32-042stab113.11 and possibly other older kernels return
* EAFNOSUPPORT for all IPv4 ping socket creation attempts due to lack
* of support in the kernel. Fallback to raw socket is necessary.
*
* https://github.com/iputils/iputils/issues/54
*
* 3) EPROTONOSUPPORT
*
* OpenVZ 2.6.32-042stab113.11 and possibly other older kernels return
* EPROTONOSUPPORT for all IPv6 ping socket creation attempts due to lack
* of support in the kernel. Fallback to raw socket is necessary.
*
* https://github.com/iputils/iputils/issues/54
*
*/
if (socktype == SOCK_DGRAM)
sock->fd = socket(family, socktype, protocol);
/* Kernel doesn't support ping sockets. */
if (sock->fd == -1 && errno == EAFNOSUPPORT && family == AF_INET)
do_fallback = 1;
if (sock->fd == -1 && errno == EPROTONOSUPPORT && family == AF_INET6)
do_fallback = 1;
/* User is not allowed to use ping sockets. */
if (sock->fd == -1 && errno == EACCES)
do_fallback = 1;
if (socktype == SOCK_RAW || do_fallback) {
if (options & F_VERBOSE && do_fallback)
fprintf(stderr, "ping: socket: %s, attempting raw socket...\n", strerror(errno));
socktype = SOCK_RAW;
sock->fd = socket(family, SOCK_RAW, protocol);
}
if (sock->fd == -1) {
/* Report error related to disabled IPv6 only when IPv6 also failed or in
* verbose mode. Report other errors always.
*/
if ((errno == EAFNOSUPPORT && socktype == AF_INET6) || options & F_VERBOSE || requisite)
fprintf(stderr, "ping: socket: %s\n", strerror(errno));
if (requisite)
exit(2);
} else
sock->socktype = socktype;
}
static void set_socket_option(socket_st *sock, int level, int optname, const void *optval, socklen_t optlen)
{
if (sock->fd == -1)
return;
if (setsockopt(sock->fd, level, optname, optval, optlen) == -1) {
fprintf(stderr, "ping: setsockopt: %s\n", strerror(errno));
exit(2);
}
}
int
main(int argc, char **argv)
{
struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_protocol = IPPROTO_UDP, .ai_socktype = SOCK_DGRAM, .ai_flags = getaddrinfo_flags };
struct addrinfo *result, *ai;
int status;
int ch;
socket_st sock4 = { .fd = -1 };
socket_st sock6 = { .fd = -1 };
char *target;
limit_capabilities();
#ifdef USE_IDN
setlocale(LC_ALL, "");
#endif
/* Support being called using `ping4` or `ping6` symlinks */
if (argv[0][strlen(argv[0])-1] == '4')
hints.ai_family = AF_INET;
else if (argv[0][strlen(argv[0])-1] == '6')
hints.ai_family = AF_INET6;
/* Parse command line options */
while ((ch = getopt(argc, argv, "h?" "4bRT:" "6F:N:" "aABc:dDfi:I:l:Lm:M:nOp:qQ:rs:S:t:UvVw:W:")) != EOF) {
switch(ch) {
/* IPv4 specific options */
case '4':
if (hints.ai_family != AF_UNSPEC) {
fprintf(stderr, "ping: Only one -4 or -6 option may be specified\n");
exit(2);
}
hints.ai_family = AF_INET;
break;
case 'b':
broadcast_pings = 1;
break;
case 'R':
if (options & F_TIMESTAMP) {
fprintf(stderr, "Only one of -T or -R may be used\n");
exit(2);
}
options |= F_RROUTE;
break;
case 'T':
if (options & F_RROUTE) {
fprintf(stderr, "Only one of -T or -R may be used\n");
exit(2);
}
options |= F_TIMESTAMP;
if (strcmp(optarg, "tsonly") == 0)
ts_type = IPOPT_TS_TSONLY;
else if (strcmp(optarg, "tsandaddr") == 0)
ts_type = IPOPT_TS_TSANDADDR;
else if (strcmp(optarg, "tsprespec") == 0)
ts_type = IPOPT_TS_PRESPEC;
else {
fprintf(stderr, "Invalid timestamp type\n");
exit(2);
}
break;
/* IPv6 specific options */
case '6':
if (hints.ai_family != AF_UNSPEC) {
fprintf(stderr, "ping: Only one -4 or -6 option may be specified\n");
exit(2);
}
hints.ai_family = AF_INET6;
break;
case 'F':
flowlabel = hextoui(optarg);
if (errno || (flowlabel & ~IPV6_FLOWINFO_FLOWLABEL)) {
fprintf(stderr, "ping: Invalid flowinfo %s\n", optarg);
exit(2);
}
options |= F_FLOWINFO;
break;
case 'N':
if (niquery_option_handler(optarg) < 0) {
ping6_usage(0);
exit(2);
}
hints.ai_socktype = SOCK_RAW;
break;
/* Common options */
case 'a':
options |= F_AUDIBLE;
break;
case 'A':
options |= F_ADAPTIVE;
break;
case 'B':
options |= F_STRICTSOURCE;
break;
case 'c':
npackets = atoi(optarg);
if (npackets <= 0) {
fprintf(stderr, "ping: bad number of packets to transmit.\n");
exit(2);
}
break;
case 'd':
options |= F_SO_DEBUG;
break;
case 'D':
options |= F_PTIMEOFDAY;
break;
case 'i':
{
double dbl;
char *ep;
errno = 0;
#ifdef USE_IDN
setlocale(LC_ALL, "C");
#endif
dbl = strtod(optarg, &ep);
#ifdef USE_IDN
setlocale(LC_ALL, "");
#endif
if (errno || *ep != '\0' ||
!finite(dbl) || dbl < 0.0 || dbl >= (double)INT_MAX / 1000 - 1.0) {
fprintf(stderr, "ping: bad timing interval\n");
exit(2);
}
interval = (int)(dbl * 1000);
options |= F_INTERVAL;
break;
}
case 'I':
/* IPv6 */
if (strchr(optarg, ':')) {
char *p, *addr = strdup(optarg);
if (!addr) {
fprintf(stderr, "ping: out of memory\n");
exit(2);
}
p = strchr(addr, SCOPE_DELIMITER);
if (p) {
*p = '\0';
device = optarg + (p - addr) + 1;
}
if (inet_pton(AF_INET6, addr, (char*)&source6.sin6_addr) <= 0) {
fprintf(stderr, "ping: invalid source address %s\n", optarg);
exit(2);
}
options |= F_STRICTSOURCE;
free(addr);
} else if (inet_pton(AF_INET, optarg, &source.sin_addr) > 0) {
options |= F_STRICTSOURCE;
} else {
device = optarg;
}
break;
case 'l':
preload = atoi(optarg);
if (preload <= 0) {
fprintf(stderr, "ping: bad preload value, should be 1..%d\n", MAX_DUP_CHK);
exit(2);
}
if (preload > MAX_DUP_CHK)
preload = MAX_DUP_CHK;
if (uid && preload > 3) {
fprintf(stderr, "ping: cannot set preload to value > 3\n");
exit(2);
}
break;
case 'L':
options |= F_NOLOOP;
break;
case 'm':
{
char *endp;
mark = (int)strtoul(optarg, &endp, 10);
if (mark < 0 || *endp != '\0') {
fprintf(stderr, "mark cannot be negative\n");
exit(2);
}
options |= F_MARK;
break;
}
case 'M':
if (strcmp(optarg, "do") == 0)
pmtudisc = IP_PMTUDISC_DO;
else if (strcmp(optarg, "dont") == 0)
pmtudisc = IP_PMTUDISC_DONT;
else if (strcmp(optarg, "want") == 0)
pmtudisc = IP_PMTUDISC_WANT;
else {
fprintf(stderr, "ping: wrong value for -M: do, dont, want are valid ones.\n");
exit(2);
}
break;
case 'n':
options |= F_NUMERIC;
break;
case 'O':
options |= F_OUTSTANDING;
break;
case 'f':
/* avoid `getaddrinfo()` during flood */
options |= F_FLOOD | F_NUMERIC;
setbuf(stdout, (char *)NULL);
break;
case 'p':
options |= F_PINGFILLED;
fill(optarg, outpack, sizeof(outpack));
break;
case 'q':
options |= F_QUIET;
break;
case 'Q':
/* IPv4 */
settos = parsetos(optarg);
/* IPv6 */
tclass = hextoui(optarg);
if (errno || (tclass & ~0xff)) {
fprintf(stderr, "ping: Invalid tclass %s\n", optarg);
exit(2);
}
break;
case 'r':
options |= F_SO_DONTROUTE;
break;
case 's':
datalen = atoi(optarg);
if (datalen < 0) {
fprintf(stderr, "ping: illegal negative packet size %d.\n", datalen);
exit(2);
}
if (datalen > MAXPACKET - 8) {
fprintf(stderr, "ping: packet size too large: %d\n",
datalen);
exit(2);
}
break;
case 'S':
sndbuf = atoi(optarg);
if (sndbuf <= 0) {
fprintf(stderr, "ping: bad sndbuf value.\n");
exit(2);
}
break;
case 't':
options |= F_TTL;
ttl = atoi(optarg);
if (ttl < 0 || ttl > 255) {
fprintf(stderr, "ping: ttl %u out of range\n", ttl);
exit(2);
}
break;
case 'U':
options |= F_LATENCY;
break;
case 'v':
options |= F_VERBOSE;
break;
case 'V':
printf("ping utility, iputils-%s\n", SNAPSHOT);
exit(0);
case 'w':
deadline = atoi(optarg);
if (deadline < 0) {
fprintf(stderr, "ping: bad wait time.\n");
exit(2);
}
break;
case 'W':
lingertime = atoi(optarg);
if (lingertime < 0 || lingertime > INT_MAX/1000000) {
fprintf(stderr, "ping: bad linger time.\n");
exit(2);
}
lingertime *= 1000;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (!argc)
usage();
target = argv[argc-1];
/* Create sockets */
enable_capability_raw();
if (hints.ai_family != AF_INET6)
create_socket(&sock4, AF_INET, hints.ai_socktype, IPPROTO_ICMP, hints.ai_family == AF_INET);
if (hints.ai_family != AF_INET)
create_socket(&sock6, AF_INET6, hints.ai_socktype, IPPROTO_ICMPV6, sock4.fd == -1);
disable_capability_raw();
/* Limit address family on single-protocol systems */
if (hints.ai_family == AF_UNSPEC) {
if (sock4.fd == -1)
hints.ai_family = AF_INET6;
else if (sock6.fd == -1)
hints.ai_family = AF_INET;
}
/* Set socket options */
if (settos)
set_socket_option(&sock4, IPPROTO_IP, IP_TOS, &settos, sizeof settos);
if (tclass)
set_socket_option(&sock6, IPPROTO_IPV6, IPV6_TCLASS, &tclass, sizeof tclass);
status = getaddrinfo(target, NULL, &hints, &result);
if (status) {
fprintf(stderr, "ping: %s: %s\n", target, gai_strerror(status));
exit(2);
}
for (ai = result; ai; ai = ai->ai_next) {
switch (ai->ai_family) {
case AF_INET:
status = ping4_run(argc, argv, ai, &sock4);
break;
case AF_INET6:
status = ping6_run(argc, argv, ai, &sock6);
break;
default:
fprintf(stderr, "ping: unknown protocol family: %d\n", ai->ai_family);
exit(2);
}
if (status == 0)
break;
}
freeaddrinfo(result);
return status;
}
int ping4_run(int argc, char **argv, struct addrinfo *ai, socket_st *sock)
{
static const struct addrinfo hints = { .ai_family = AF_INET, .ai_protocol = IPPROTO_UDP, .ai_flags = getaddrinfo_flags };
int hold, packlen;
unsigned char *packet;
char *target;
char hnamebuf[NI_MAXHOST];
char rspace[3 + 4 * NROUTES + 1]; /* record route space */
__u32 *tmp_rspace;
if (argc > 1) {
if (options & F_RROUTE)
usage();
else if (options & F_TIMESTAMP) {
if (ts_type != IPOPT_TS_PRESPEC)
usage();
if (argc > 5)
usage();
} else {
if (argc > 10)
usage();
options |= F_SOURCEROUTE;
}
}
while (argc > 0) {
target = *argv;
memset((char *)&whereto, 0, sizeof(whereto));
whereto.sin_family = AF_INET;
if (inet_aton(target, &whereto.sin_addr) == 1) {
hostname = target;
if (argc == 1)
options |= F_NUMERIC;
} else {
struct addrinfo *result = NULL;
int status;
if (argc > 1 || !ai) {
status = getaddrinfo(target, NULL, &hints, &result);
if (status) {
fprintf(stderr, "ping: %s: %s\n", target, gai_strerror(status));
exit(2);
}
ai = result;
}
memcpy(&whereto, ai->ai_addr, sizeof whereto);
memset(hnamebuf, 0, sizeof hnamebuf);
if (ai->ai_canonname)
strncpy(hnamebuf, ai->ai_canonname, sizeof hnamebuf - 1);
hostname = hnamebuf;
if (result)
freeaddrinfo(result);
}
if (argc > 1)
route[nroute++] = whereto.sin_addr.s_addr;
argc--;
argv++;
}
if (source.sin_addr.s_addr == 0) {
socklen_t alen;
struct sockaddr_in dst = whereto;
int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (probe_fd < 0) {
perror("socket");
exit(2);
}
if (device) {
struct ifreq ifr;
int i;
int fds[2] = {probe_fd, sock->fd};
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ-1);
for (i = 0; i < 2; i++) {
int fd = fds[i];
int rc;
enable_capability_raw();
rc = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1);
disable_capability_raw();
if (rc == -1) {
if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
struct ip_mreqn imr;
if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
fprintf(stderr, "ping: unknown iface %s\n", device);
exit(2);
}
memset(&imr, 0, sizeof(imr));
imr.imr_ifindex = ifr.ifr_ifindex;
if (setsockopt(fd, SOL_IP, IP_MULTICAST_IF, &imr, sizeof(imr)) == -1) {
perror("ping: IP_MULTICAST_IF");
exit(2);
}
} else {
perror("ping: SO_BINDTODEVICE");
exit(2);
}
}
}
}
if (settos &&
setsockopt(probe_fd, IPPROTO_IP, IP_TOS, (char *)&settos, sizeof(int)) < 0)
perror("Warning: error setting QOS sockopts");
dst.sin_port = htons(1025);
if (nroute)
dst.sin_addr.s_addr = route[0];
if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) {
if (errno == EACCES) {
if (broadcast_pings == 0) {
fprintf(stderr,
"Do you want to ping broadcast? Then -b. If not, check your local firewall rules.\n");
exit(2);
}
fprintf(stderr, "WARNING: pinging broadcast address\n");
if (setsockopt(probe_fd, SOL_SOCKET, SO_BROADCAST,
&broadcast_pings, sizeof(broadcast_pings)) < 0) {
perror ("can't set broadcasting");
exit(2);
}
if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) {
perror("connect");
exit(2);
}
} else {
perror("connect");
exit(2);
}
}
alen = sizeof(source);
if (getsockname(probe_fd, (struct sockaddr*)&source, &alen) == -1) {
perror("getsockname");
exit(2);
}
source.sin_port = 0;
#ifndef WITHOUT_IFADDRS
if (device) {
struct ifaddrs *ifa0, *ifa;
int ret;
ret = getifaddrs(&ifa0);
if (ret) {
fprintf(stderr, "gatifaddrs() failed.\n");
exit(2);
}
for (ifa = ifa0; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_INET)
continue;
if (!strncmp(ifa->ifa_name, device, sizeof(device) - 1) &&
!memcmp(&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
&source.sin_addr, sizeof(source.sin_addr)))
break;
}
freeifaddrs(ifa0);
if (!ifa)
fprintf(stderr, "ping: Warning: source address might be selected on device other than %s.\n", device);
}
#endif
close(probe_fd);
} while (0);
if (whereto.sin_addr.s_addr == 0)
whereto.sin_addr.s_addr = source.sin_addr.s_addr;
if (device) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ-1);
if (ioctl(sock->fd, SIOCGIFINDEX, &ifr) < 0) {
fprintf(stderr, "ping: unknown iface %s\n", device);
exit(2);
}
cmsg.ipi.ipi_ifindex = ifr.ifr_ifindex;
cmsg_len = sizeof(cmsg);
}
if (broadcast_pings || IN_MULTICAST(ntohl(whereto.sin_addr.s_addr))) {
if (uid) {
if (interval < 1000) {
fprintf(stderr, "ping: broadcast ping with too short interval.\n");
exit(2);
}
if (pmtudisc >= 0 && pmtudisc != IP_PMTUDISC_DO) {
fprintf(stderr, "ping: broadcast ping does not fragment.\n");
exit(2);
}
}
if (pmtudisc < 0)
pmtudisc = IP_PMTUDISC_DO;
}
if (pmtudisc >= 0) {
if (setsockopt(sock->fd, SOL_IP, IP_MTU_DISCOVER, &pmtudisc, sizeof pmtudisc) == -1) {
perror("ping: IP_MTU_DISCOVER");
exit(2);
}
}
if ((options&F_STRICTSOURCE) &&
bind(sock->fd, (struct sockaddr *) &source, sizeof source) == -1) {
perror("bind");
exit(2);
}
if (sock->socktype == SOCK_RAW) {
struct icmp_filter filt;
filt.data = ~((1<<ICMP_SOURCE_QUENCH)|
(1<<ICMP_DEST_UNREACH)|
(1<<ICMP_TIME_EXCEEDED)|
(1<<ICMP_PARAMETERPROB)|
(1<<ICMP_REDIRECT)|
(1<<ICMP_ECHOREPLY));
if (setsockopt(sock->fd, SOL_RAW, ICMP_FILTER, &filt, sizeof filt) == -1)
perror("WARNING: setsockopt(ICMP_FILTER)");
}
hold = 1;
if (setsockopt(sock->fd, SOL_IP, IP_RECVERR, &hold, sizeof hold))
fprintf(stderr, "WARNING: your kernel is veeery old. No problems.\n");
if (sock->socktype == SOCK_DGRAM) {
if (setsockopt(sock->fd, SOL_IP, IP_RECVTTL, &hold, sizeof hold))
perror("WARNING: setsockopt(IP_RECVTTL)");
if (setsockopt(sock->fd, SOL_IP, IP_RETOPTS, &hold, sizeof hold))
perror("WARNING: setsockopt(IP_RETOPTS)");
}
/* record route option */
if (options & F_RROUTE) {
memset(rspace, 0, sizeof(rspace));
rspace[0] = IPOPT_NOP;
rspace[1+IPOPT_OPTVAL] = IPOPT_RR;
rspace[1+IPOPT_OLEN] = sizeof(rspace)-1;
rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF;
optlen = 40;
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, sizeof rspace) < 0) {
perror("ping: record route");
exit(2);
}
}
if (options & F_TIMESTAMP) {
memset(rspace, 0, sizeof(rspace));
rspace[0] = IPOPT_TIMESTAMP;
rspace[1] = (ts_type==IPOPT_TS_TSONLY ? 40 : 36);
rspace[2] = 5;
rspace[3] = ts_type;
if (ts_type == IPOPT_TS_PRESPEC) {
int i;
rspace[1] = 4+nroute*8;
for (i = 0; i < nroute; i++) {
tmp_rspace = (__u32*)&rspace[4+i*8];
*tmp_rspace = route[i];
}
}
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) {
rspace[3] = 2;
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) {
perror("ping: ts option");
exit(2);
}
}
optlen = 40;
}
if (options & F_SOURCEROUTE) {
int i;
memset(rspace, 0, sizeof(rspace));
rspace[0] = IPOPT_NOOP;
rspace[1+IPOPT_OPTVAL] = (options & F_SO_DONTROUTE) ? IPOPT_SSRR
: IPOPT_LSRR;
rspace[1+IPOPT_OLEN] = 3 + nroute*4;
rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF;
for (i = 0; i < nroute; i++) {
tmp_rspace = (__u32*)&rspace[4+i*4];
*tmp_rspace = route[i];
}
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, 4 + nroute*4) < 0) {
perror("ping: record route");
exit(2);
}
optlen = 40;
}
/* Estimate memory eaten by single packet. It is rough estimate.
* Actually, for small datalen's it depends on kernel side a lot. */
hold = datalen + 8;
hold += ((hold+511)/512)*(optlen + 20 + 16 + 64 + 160);
sock_setbufs(sock, hold);
if (broadcast_pings) {
if (setsockopt(sock->fd, SOL_SOCKET, SO_BROADCAST, &broadcast_pings, sizeof broadcast_pings) < 0) {
perror ("ping: can't set broadcasting");
exit(2);
}
}
if (options & F_NOLOOP) {
int loop = 0;
if (setsockopt(sock->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof loop) == -1) {
perror ("ping: can't disable multicast loopback");
exit(2);
}
}
if (options & F_TTL) {
int ittl = ttl;
if (setsockopt(sock->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof ttl) == -1) {
perror ("ping: can't set multicast time-to-live");
exit(2);
}
if (setsockopt(sock->fd, IPPROTO_IP, IP_TTL, &ittl, sizeof ittl) == -1) {
perror ("ping: can't set unicast time-to-live");
exit(2);
}
}
if (datalen > 0xFFFF - 8 - optlen - 20) {
fprintf(stderr, "Error: packet size %d is too large. Maximum is %d\n", datalen, 0xFFFF-8-20-optlen);
exit(2);
}
if (datalen >= sizeof(struct timeval)) /* can we time transfer */
timing = 1;
packlen = datalen + MAXIPLEN + MAXICMPLEN;
if (!(packet = (unsigned char *)malloc((unsigned int)packlen))) {
fprintf(stderr, "ping: out of memory.\n");
exit(2);
}
printf("PING %s (%s) ", hostname, inet_ntoa(whereto.sin_addr));
if (device || (options&F_STRICTSOURCE))
printf("from %s %s: ", inet_ntoa(source.sin_addr), device ?: "");
printf("%d(%d) bytes of data.\n", datalen, datalen+8+optlen+20);
setup(sock);
main_loop(&ping4_func_set, sock, packet, packlen);
}
int ping4_receive_error_msg(socket_st *sock)
{
int res;
char cbuf[512];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct sock_extended_err *e;
struct icmphdr icmph;
struct sockaddr_in target;
int net_errors = 0;
int local_errors = 0;
int saved_errno = errno;
iov.iov_base = &icmph;
iov.iov_len = sizeof(icmph);
msg.msg_name = (void*)⌖
msg.msg_namelen = sizeof(target);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = cbuf;
msg.msg_controllen = sizeof(cbuf);
res = recvmsg(sock->fd, &msg, MSG_ERRQUEUE|MSG_DONTWAIT);
if (res < 0)
goto out;
e = NULL;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_IP) {
if (cmsg->cmsg_type == IP_RECVERR)
e = (struct sock_extended_err *)CMSG_DATA(cmsg);
}
}
if (e == NULL)
abort();
if (e->ee_origin == SO_EE_ORIGIN_LOCAL) {
local_errors++;
if (options & F_QUIET)
goto out;
if (options & F_FLOOD)
write_stdout("E", 1);
else if (e->ee_errno != EMSGSIZE)
fprintf(stderr, "ping: local error: %s\n", strerror(e->ee_errno));
else
fprintf(stderr, "ping: local error: Message too long, mtu=%u\n", e->ee_info);
nerrors++;
} else if (e->ee_origin == SO_EE_ORIGIN_ICMP) {
struct sockaddr_in *sin = (struct sockaddr_in*)(e+1);
if (res < sizeof(icmph) ||
target.sin_addr.s_addr != whereto.sin_addr.s_addr ||
icmph.type != ICMP_ECHO ||
!is_ours(sock, icmph.un.echo.id)) {
/* Not our error, not an error at all. Clear. */
saved_errno = 0;
goto out;
}
acknowledge(ntohs(icmph.un.echo.sequence));
if (sock->socktype == SOCK_RAW && !sock->working_recverr) {
struct icmp_filter filt;
sock->working_recverr = 1;
/* OK, it works. Add stronger filter. */
filt.data = ~((1<<ICMP_SOURCE_QUENCH)|
(1<<ICMP_REDIRECT)|
(1<<ICMP_ECHOREPLY));
if (setsockopt(sock->fd, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1)
perror("\rWARNING: setsockopt(ICMP_FILTER)");
}
net_errors++;
nerrors++;
if (options & F_QUIET)
goto out;
if (options & F_FLOOD) {
write_stdout("\bE", 2);
} else {
print_timestamp();
printf("From %s icmp_seq=%u ", pr_addr(sin, sizeof *sin), ntohs(icmph.un.echo.sequence));
pr_icmph(e->ee_type, e->ee_code, e->ee_info, NULL);
fflush(stdout);
}
}
out:
errno = saved_errno;
return net_errors ? : -local_errors;
}
/*
* pinger --
* Compose and transmit an ICMP ECHO REQUEST packet. The IP packet
* will be added on by the kernel. The ID field is our UNIX process ID,
* and the sequence number is an ascending integer. The first 8 bytes
* of the data portion are used to hold a UNIX "timeval" struct in VAX
* byte-order, to compute the round-trip time.
*/
int ping4_send_probe(socket_st *sock, void *packet, unsigned packet_size)
{
struct icmphdr *icp;
int cc;
int i;