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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. 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 ICMP datagram sockets,
* this program has to run SUID to ROOT or with
* net_cap_raw enabled.
*/
#define _GNU_SOURCE
#include "ping.h"
#include <assert.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <ifaddrs.h>
#include <math.h>
#include <locale.h>
/* FIXME: global_rts will be removed in future */
struct ping_rts *global_rts;
#ifndef ICMP_FILTER
#define ICMP_FILTER 1
struct icmp_filter {
uint32_t 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 */
#define CASE_TYPE(x) case x: return #x;
static char *str_family(int family)
{
switch (family) {
CASE_TYPE(AF_UNSPEC)
CASE_TYPE(AF_INET)
CASE_TYPE(AF_INET6)
default:
error(2, 0, _("unknown protocol family: %d"), family);
}
return "";
}
static char *str_socktype(int socktype)
{
if (!socktype)
return "0";
switch (socktype) {
CASE_TYPE(SOCK_DGRAM)
CASE_TYPE(SOCK_RAW)
default:
error(2, 0, _("unknown sock type: %d"), socktype);
}
return "";
}
static void create_socket(struct ping_rts *rts, 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
* process 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 [1]. Debian 9.5 based container with kernel 4.10
* returns EPROTONOSUPPORT also for IPv4 [2]. Fallback to raw socket is
* necessary.
*
* [1] https://github.com/iputils/iputils/issues/54
* [2] https://github.com/iputils/iputils/issues/129
*/
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)
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) {
socktype = SOCK_RAW;
sock->fd = socket(family, SOCK_RAW, protocol);
}
sock->socktype = socktype;
/* valid socket */
if (sock->fd != -1)
return;
/* failed to create socket */
if (requisite || rts->opt_verbose) {
error(0, 0, "socktype: %s", str_socktype(socktype));
error(0, errno, "socket");
}
if (requisite) {
if (socktype == SOCK_RAW && geteuid() != 0)
error(0, 0, _("=> missing cap_net_raw+p capability or setuid?"));
exit(2);
}
}
static void set_socket_option(socket_st *sock, int level, int optname,
const void *optval, socklen_t olen)
{
if (sock->fd == -1)
return;
if (setsockopt(sock->fd, level, optname, optval, olen) == -1)
error(2, errno, "setsockopt");
}
/* Much like strtod(3), but will fails if str is not valid number. */
static double ping_strtod(const char *str, const char *err_msg)
{
double num;
char *end = NULL;
int strtod_errno = 0;
if (str == NULL || *str == '\0')
goto err;
errno = 0;
/*
* Here we always want to use locale regardless USE_IDN or ENABLE_NLS,
* because it handles decimal point of -i/-W input options.
*/
setlocale(LC_ALL, "C");
num = strtod(str, &end);
strtod_errno = errno;
setlocale(LC_ALL, "");
/* Ignore setlocale() errno (e.g. invalid locale in env). */
errno = strtod_errno;
if (errno || str == end || (end && *end)) {
error(0, 0, _("option argument contains garbage: %s"), end);
error(0, 0, _("this will become fatal error in the future"));
}
switch (fpclassify(num)) {
case FP_NORMAL:
case FP_ZERO:
break;
default:
errno = ERANGE;
goto err;
}
return num;
err:
error(2, errno, "%s: %s", err_msg, str);
abort(); /* cannot be reached, above error() will exit */
return 0.0;
}
static int parseflow(char *str)
{
const char *cp;
unsigned long val;
char *ep;
/* handle both hex and decimal values */
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
cp = str + 2;
val = (int)strtoul(cp, &ep, 16);
} else {
val = (int)strtoul(str, &ep, 10);
}
/* doesn't look like decimal or hex, eh? */
if (*ep != '\0')
error(2, 0, _("bad value for flowinfo: %s"), str);
if (val & ~IPV6_FLOWINFO_FLOWLABEL)
error(2, 0, _("flow value is greater than 20 bits: %s"), str);
return (val);
}
/* Set Type of Service (TOS) and other Quality of Service relating bits */
static int parsetos(char *str)
{
const char *cp;
int tos;
char *ep;
/* handle both hex and decimal values */
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
cp = str + 2;
tos = (int)strtol(cp, &ep, 16);
} else {
tos = (int)strtol(str, &ep, 10);
}
/* doesn't look like decimal or hex, eh? */
if (*ep != '\0')
error(2, 0, _("bad TOS value: %s"), str);
if (tos > TOS_MAX)
error(2, 0, _("the decimal value of TOS bits must be in range 0-255: %d"), tos);
return (tos);
}
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 ret_val;
int ch;
socket_st sock4 = { .fd = -1 };
socket_st sock6 = { .fd = -1 };
char *target;
char *outpack_fill = NULL;
static struct ping_rts rts = {
.interval = 1000,
.preload = 1,
.lingertime = MAXWAIT * 1000,
.confirm_flag = MSG_CONFIRM,
.tmin = LONG_MAX,
.pipesize = -1,
.datalen = DEFDATALEN,
.ident = -1,
.screen_width = INT_MAX,
#ifdef HAVE_LIBCAP
.cap_raw = CAP_NET_RAW,
.cap_admin = CAP_NET_ADMIN,
#endif
.pmtudisc = -1,
.source.sin_family = AF_INET,
.source6.sin6_family = AF_INET6,
.ni.query = -1,
.ni.subject_type = -1,
};
/* FIXME: global_rts will be removed in future */
global_rts = &rts;
atexit(close_stdout);
limit_capabilities(&rts);
#if defined(USE_IDN) || defined(ENABLE_NLS)
setlocale(LC_ALL, "");
#if defined(USE_IDN)
if (!strcmp(setlocale(LC_ALL, NULL), "C"))
hints.ai_flags &= ~ AI_CANONIDN;
#endif
#ifdef ENABLE_NLS
bindtextdomain (PACKAGE_NAME, LOCALEDIR);
textdomain (PACKAGE_NAME);
#endif
#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:CdDe:fi:I:l:Lm:M:nOp:qQ:rs:S:t:UvVw:W:")) != EOF) {
switch(ch) {
/* IPv4 specific options */
case '4':
if (hints.ai_family == AF_INET6)
error(2, 0, _("only one -4 or -6 option may be specified"));
hints.ai_family = AF_INET;
break;
case 'b':
rts.broadcast_pings = 1;
break;
case 'e':
rts.ident = htons(strtoul_or_err(optarg, _("invalid argument"),
0, IDENTIFIER_MAX));
break;
case 'R':
if (rts.opt_timestamp)
error(2, 0, _("only one of -T or -R may be used"));
rts.opt_rroute = 1;
break;
case 'T':
if (rts.opt_rroute)
error(2, 0, _("only one of -T or -R may be used"));
rts.opt_timestamp = 1;
if (strcmp(optarg, "tsonly") == 0)
rts.ts_type = IPOPT_TS_TSONLY;
else if (strcmp(optarg, "tsandaddr") == 0)
rts.ts_type = IPOPT_TS_TSANDADDR;
else if (strcmp(optarg, "tsprespec") == 0)
rts.ts_type = IPOPT_TS_PRESPEC;
else
error(2, 0, _("invalid timestamp type: %s"), optarg);
break;
/* IPv6 specific options */
case '6':
if (hints.ai_family == AF_INET)
error(2, 0, _("only one -4 or -6 option may be specified"));
hints.ai_family = AF_INET6;
break;
case 'F':
rts.flowlabel = parseflow(optarg);
rts.opt_flowinfo = 1;
break;
case 'N':
if (niquery_option_handler(&rts.ni, optarg) < 0)
usage();
hints.ai_socktype = SOCK_RAW;
break;
/* Common options */
case 'a':
rts.opt_audible = 1;
break;
case 'A':
rts.opt_adaptive = 1;
break;
case 'B':
rts.opt_strictsource = 1;
break;
case 'c':
rts.npackets = strtol_or_err(optarg, _("invalid argument"), 1, LONG_MAX);
break;
case 'C':
rts.opt_connect_sk = 1;
break;
case 'd':
rts.opt_so_debug = 1;
break;
case 'D':
rts.opt_ptimeofday = 1;
break;
case 'i':
{
double optval;
optval = ping_strtod(optarg, _("bad timing interval"));
if (islessequal(optval, 0) || isgreater(optval, (double)INT_MAX / 1000))
error(2, 0, _("bad timing interval: %s"), optarg);
rts.interval = (int)(optval * 1000);
rts.opt_interval = 1;
}
break;
case 'I':
/* IPv6 */
if (strchr(optarg, ':')) {
char *p, *addr = strdup(optarg);
if (!addr)
error(2, errno, _("cannot copy: %s"), optarg);
p = strchr(addr, SCOPE_DELIMITER);
if (p) {
*p = '\0';
rts.device = optarg + (p - addr) + 1;
}
if (inet_pton(AF_INET6, addr, (char *)&rts.source6.sin6_addr) <= 0)
error(2, 0, _("invalid source address: %s"), optarg);
rts.opt_strictsource = 1;
free(addr);
} else if (inet_pton(AF_INET, optarg, &rts.source.sin_addr) > 0) {
rts.opt_strictsource = 1;
} else {
rts.device = optarg;
}
break;
case 'l':
rts.preload = strtol_or_err(optarg, _("invalid argument"), 1, MAX_DUP_CHK);
if (rts.uid && rts.preload > 3)
error(2, 0, _("cannot set preload to value greater than 3: %d"), rts.preload);
break;
case 'L':
rts.opt_noloop = 1;
break;
case 'm':
rts.mark = strtoul_or_err(optarg, _("invalid argument"), 0, UINT_MAX);
rts.opt_mark = 1;
break;
case 'M':
if (strcmp(optarg, "do") == 0)
rts.pmtudisc = IP_PMTUDISC_DO;
else if (strcmp(optarg, "dont") == 0)
rts.pmtudisc = IP_PMTUDISC_DONT;
else if (strcmp(optarg, "want") == 0)
rts.pmtudisc = IP_PMTUDISC_WANT;
else if (strcmp(optarg, "probe") == 0)
rts.pmtudisc = IP_PMTUDISC_PROBE;
else
error(2, 0, _("invalid -M argument: %s"), optarg);
break;
case 'n':
rts.opt_numeric = 1;
break;
case 'O':
rts.opt_outstanding = 1;
break;
case 'f':
rts.opt_flood = 1;
/* avoid `getaddrinfo()` during flood */
rts.opt_numeric = 1;
setbuf(stdout, (char *)NULL);
break;
case 'p':
rts.opt_pingfilled = 1;
free(outpack_fill);
outpack_fill = strdup(optarg);
if (!outpack_fill)
error(2, errno, _("memory allocation failed"));
break;
case 'q':
rts.opt_quiet = 1;
break;
case 'Q':
rts.settos = parsetos(optarg); /* IPv4 */
rts.tclass = rts.settos; /* IPv6 */
break;
case 'r':
rts.opt_so_dontroute = 1;
break;
case 's':
rts.datalen = strtol_or_err(optarg, _("invalid argument"), 0, INT_MAX);
break;
case 'S':
rts.sndbuf = strtol_or_err(optarg, _("invalid argument"), 1, INT_MAX);
break;
case 't':
rts.ttl = strtol_or_err(optarg, _("invalid argument"), 0, 255);
rts.opt_ttl = 1;
break;
case 'U':
rts.opt_latency = 1;
break;
case 'v':
rts.opt_verbose = 1;
break;
case 'V':
printf(IPUTILS_VERSION("ping"));
print_config();
exit(0);
case 'w':
rts.deadline = strtol_or_err(optarg, _("invalid argument"), 0, INT_MAX);
break;
case 'W':
{
double optval;
optval = ping_strtod(optarg, _("bad linger time"));
if (isless(optval, 0) || isgreater(optval, (double)INT_MAX / 1000))
error(2, 0, _("bad linger time: %s"), optarg);
/* lingertime will be converted to usec later */
rts.lingertime = (int)(optval * 1000);
}
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (!argc)
error(1, EDESTADDRREQ, "usage error");
iputils_srand();
target = argv[argc - 1];
rts.outpack = malloc(rts.datalen + 28);
if (!rts.outpack)
error(2, errno, _("memory allocation failed"));
if (outpack_fill) {
fill(&rts, outpack_fill, rts.outpack, rts.datalen);
free(outpack_fill);
}
/* Create sockets */
enable_capability_raw();
/*
* Current Linux kernel 6.0 doesn't support on SOCK_DGRAM setting
* ident == 0
*/
if (!rts.ident) {
if (rts.opt_verbose)
error(0, 0, _("WARNING: ident 0 => forcing raw socket"));
hints.ai_socktype = SOCK_RAW;
}
if (hints.ai_family != AF_INET6) {
create_socket(&rts, &sock4, AF_INET, hints.ai_socktype, IPPROTO_ICMP,
hints.ai_family == AF_INET);
}
if (hints.ai_family != AF_INET) {
create_socket(&rts, &sock6, AF_INET6, hints.ai_socktype, IPPROTO_ICMPV6, sock4.fd == -1);
/* This may not be needed if both protocol versions always had the same value, but
* since I don't know that, it's better to be safe than sorry. */
rts.pmtudisc = rts.pmtudisc == IP_PMTUDISC_DO ? IPV6_PMTUDISC_DO :
rts.pmtudisc == IP_PMTUDISC_DONT ? IPV6_PMTUDISC_DONT :
rts.pmtudisc == IP_PMTUDISC_WANT ? IPV6_PMTUDISC_WANT :
rts.pmtudisc == IP_PMTUDISC_PROBE? IPV6_PMTUDISC_PROBE: rts.pmtudisc;
}
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;
}
if (rts.opt_verbose)
error(0, 0, "sock4.fd: %d (socktype: %s), sock6.fd: %d (socktype: %s),"
" hints.ai_family: %s\n",
sock4.fd, str_socktype(sock4.socktype),
sock6.fd, str_socktype(sock6.socktype),
str_family(hints.ai_family));
/* Set socket options */
if (rts.settos)
set_socket_option(&sock4, IPPROTO_IP, IP_TOS, &rts.settos, sizeof(rts.settos));
if (rts.tclass)
set_socket_option(&sock6, IPPROTO_IPV6, IPV6_TCLASS, &rts.tclass, sizeof(rts.tclass));
/* getaddrinfo fails to indicate a scopeid when not used in dual-stack mode.
* Work around by always using dual-stack name resolution.
*
* https://github.com/iputils/iputils/issues/252
*/
int target_ai_family = hints.ai_family;
hints.ai_family = AF_UNSPEC;
unsigned char buf[sizeof(struct in6_addr)];
if (!strchr(target, '%') && sock6.socktype == SOCK_DGRAM &&
inet_pton(AF_INET6, target, buf) > 0 &&
(IN6_IS_ADDR_LINKLOCAL(buf) || IN6_IS_ADDR_MC_LINKLOCAL(buf))) {
error(0, 0, _(
"Warning: IPv6 link-local address on ICMP datagram socket may require ifname or scope-id"
" => use: address%%<ifname|scope-id>"));
}
ret_val = getaddrinfo(target, NULL, &hints, &result);
if (ret_val)
error(2, 0, "%s: %s", target, gai_strerror(ret_val));
for (ai = result; ai; ai = ai->ai_next) {
if (rts.opt_verbose)
printf("ai->ai_family: %s, ai->ai_canonname: '%s'\n",
str_family(ai->ai_family),
ai->ai_canonname ? ai->ai_canonname : "");
if (target_ai_family != AF_UNSPEC &&
target_ai_family != ai->ai_family) {
if (!ai->ai_next) {
/* An address was found, but not of the family we really want.
* Throw the appropriate gai error.
*/
error(2, 0, "%s: %s", target, gai_strerror(EAI_ADDRFAMILY));
}
continue;
}
switch (ai->ai_family) {
case AF_INET:
ret_val = ping4_run(&rts, argc, argv, ai, &sock4);
break;
case AF_INET6:
ret_val = ping6_run(&rts, argc, argv, ai, &sock6);
break;
default:
error(2, 0, _("unknown protocol family: %d"), ai->ai_family);
}
if (ret_val >= 0)
break;
/* ret_val < 0 means to go on to next addrinfo result, there
* better be one. */
assert(ai->ai_next);
}
freeaddrinfo(result);
free(rts.outpack);
return ret_val;
}
static int iface_name2index(struct ping_rts *rts, int fd)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, rts->device, IFNAMSIZ - 1);
if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0)
error(2, 0, _("unknown iface: %s"), rts->device);
return ifr.ifr_ifindex;
}
static void bind_to_device(struct ping_rts *rts, int fd, in_addr_t addr)
{
int rc;
int errno_save;
enable_capability_raw();
rc = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, rts->device,
strlen(rts->device) + 1);
errno_save = errno;
disable_capability_raw();
if (rc != -1)
return;
if (IN_MULTICAST(ntohl(addr))) {
struct ip_mreqn imr;
memset(&imr, 0, sizeof(imr));
imr.imr_ifindex = iface_name2index(rts, fd);
if (setsockopt(fd, SOL_IP, IP_MULTICAST_IF, &imr, sizeof(imr)) == -1)
error(2, errno, "IP_MULTICAST_IF");
} else {
error(2, errno_save, "SO_BINDTODEVICE %s", rts->device);
}
}
/* return >= 0: exit with this code, < 0: go on to next addrinfo result */
int ping4_run(struct ping_rts *rts, 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];
unsigned char rspace[3 + 4 * NROUTES + 1]; /* record route space */
uint32_t *tmp_rspace;
struct sockaddr_in dst;
if (argc > 1) {
if (rts->opt_rroute)
usage();
else if (rts->opt_timestamp) {
if (rts->ts_type != IPOPT_TS_PRESPEC)
usage();
if (argc > 5)
usage();
} else {
if (argc > 10)
usage();
rts->opt_sourceroute = 1;
}
}
while (argc > 0) {
target = *argv;
memset((char *)&rts->whereto, 0, sizeof(rts->whereto));
rts->whereto.sin_family = AF_INET;
if (inet_aton(target, &rts->whereto.sin_addr) == 1) {
rts->hostname = target;
if (argc == 1)
rts->opt_numeric = 1;
} else {
struct addrinfo *result = ai;
int ret_val;
if (argc > 1) {
ret_val = getaddrinfo(target, NULL, &hints, &result);
if (ret_val)
error(2, 0, "%s: %s", target, gai_strerror(ret_val));
}
memcpy(&rts->whereto, result->ai_addr, sizeof rts->whereto);
memset(hnamebuf, 0, sizeof hnamebuf);
if (result->ai_canonname)
strncpy(hnamebuf, result->ai_canonname, sizeof hnamebuf - 1);
rts->hostname = hnamebuf;
if (argc > 1)
freeaddrinfo(result);
}
if (argc > 1)
rts->route[rts->nroute++] = rts->whereto.sin_addr.s_addr;
argc--;
argv++;
}
if (rts->source.sin_addr.s_addr == 0) {
socklen_t alen;
int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
dst = rts->whereto;
if (probe_fd < 0)
error(2, errno, "socket");
if (rts->device) {
bind_to_device(rts, probe_fd, dst.sin_addr.s_addr);
bind_to_device(rts, sock->fd, dst.sin_addr.s_addr);
}
if (rts->settos &&
setsockopt(probe_fd, IPPROTO_IP, IP_TOS, (char *)&rts->settos, sizeof(int)) < 0)
error(0, errno, _("warning: QOS sockopts"));
if (rts->opt_mark)
sock_setmark(rts->mark, probe_fd);
dst.sin_port = htons(1025);
if (rts->nroute)
dst.sin_addr.s_addr = rts->route[0];
if (connect(probe_fd, (struct sockaddr *)&dst, sizeof(dst)) == -1) {
if (errno == EACCES) {
if (rts->broadcast_pings == 0)
error(2, 0,
_("Do you want to ping broadcast? Then -b. If not, check your local firewall rules"));
fprintf(stderr, _("WARNING: pinging broadcast address\n"));
if (setsockopt(probe_fd, SOL_SOCKET, SO_BROADCAST,
&rts->broadcast_pings, sizeof(rts->broadcast_pings)) < 0)
error(2, errno, _("cannot set broadcasting"));
if (connect(probe_fd, (struct sockaddr *)&dst, sizeof(dst)) == -1)
error(2, errno, "connect");
} else if ((errno == EHOSTUNREACH || errno == ENETUNREACH) && ai->ai_next) {
close(probe_fd);
return -1;
} else {
error(2, errno, "connect");
}
}
alen = sizeof(rts->source);
if (getsockname(probe_fd, (struct sockaddr *)&rts->source, &alen) == -1)
error(2, errno, "getsockname");
rts->source.sin_port = 0;
if (rts->device) {
struct ifaddrs *ifa0, *ifa;
int ret;
ret = getifaddrs(&ifa0);
if (ret)
error(2, errno, _("gatifaddrs failed"));
for (ifa = ifa0; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_name || !ifa->ifa_addr ||
ifa->ifa_addr->sa_family != AF_INET)
continue;
if (!strcmp(ifa->ifa_name, rts->device) &&
!memcmp(&((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
&rts->source.sin_addr, sizeof(rts->source.sin_addr)))
break;
}
freeifaddrs(ifa0);
if (!ifa)
error(0, 0, _("Warning: source address might be selected on device other than: %s"), rts->device);
}
close(probe_fd);
} else if (rts->device) {
bind_to_device(rts, sock->fd, rts->whereto.sin_addr.s_addr);
}
if (rts->whereto.sin_addr.s_addr == 0)
rts->whereto.sin_addr.s_addr = rts->source.sin_addr.s_addr;
if (rts->broadcast_pings || IN_MULTICAST(ntohl(rts->whereto.sin_addr.s_addr))) {
rts->multicast = 1;
if (rts->uid) {
if (rts->interval < 1000)
error(2, 0, _("broadcast ping with too short interval: %d"), rts->interval);
if (rts->pmtudisc >= 0 && rts->pmtudisc != IP_PMTUDISC_DO)
error(2, 0, _("broadcast ping does not fragment"));
}
if (rts->pmtudisc < 0)
rts->pmtudisc = IP_PMTUDISC_DO;
}
if (rts->pmtudisc >= 0) {
if (setsockopt(sock->fd, SOL_IP, IP_MTU_DISCOVER, &rts->pmtudisc, sizeof rts->pmtudisc) == -1)
error(2, errno, "IP_MTU_DISCOVER");
}
int set_ident = rts->ident > 0 && sock->socktype == SOCK_DGRAM;
if (set_ident)
rts->source.sin_port = rts->ident;
if (rts->opt_strictsource || set_ident) {
if (bind(sock->fd, (struct sockaddr *)&rts->source, sizeof rts->source) == -1)
error(2, errno, "bind");
}
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)
error(0, errno, _("WARNING: setsockopt(ICMP_FILTER)"));
}
hold = 1;
if (setsockopt(sock->fd, SOL_IP, IP_RECVERR, &hold, sizeof hold))
error(0, 0, _("WARNING: your kernel is veeery old. No problems."));
if (sock->socktype == SOCK_DGRAM) {
if (setsockopt(sock->fd, SOL_IP, IP_RECVTTL, &hold, sizeof hold))
error(0, errno, _("WARNING: setsockopt(IP_RECVTTL)"));
if (setsockopt(sock->fd, SOL_IP, IP_RETOPTS, &hold, sizeof hold))
error(0, errno, _("WARNING: setsockopt(IP_RETOPTS)"));
}
/* record route option */
if (rts->opt_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;
rts->optlen = 40;
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, sizeof rspace) < 0)
error(2, errno, "record route");
}
if (rts->opt_timestamp) {
memset(rspace, 0, sizeof(rspace));
rspace[0] = IPOPT_TIMESTAMP;
rspace[1] = (rts->ts_type == IPOPT_TS_TSONLY ? 40 : 36);
rspace[2] = 5;
rspace[3] = rts->ts_type;
if (rts->ts_type == IPOPT_TS_PRESPEC) {
int i;
rspace[1] = 4 + rts->nroute * 8;
for (i = 0; i < rts->nroute; i++) {
tmp_rspace = (uint32_t *)&rspace[4 + i * 8];
*tmp_rspace = rts->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)
error(2, errno, "ts option");
}
rts->optlen = 40;
}
if (rts->opt_sourceroute) {
int i;
memset(rspace, 0, sizeof(rspace));
rspace[0] = IPOPT_NOOP;
rspace[1 + IPOPT_OPTVAL] = rts->opt_so_dontroute ? IPOPT_SSRR : IPOPT_LSRR;
rspace[1 + IPOPT_OLEN] = 3 + rts->nroute * 4;
rspace[1 + IPOPT_OFFSET] = IPOPT_MINOFF;
for (i = 0; i < rts->nroute; i++) {
tmp_rspace = (uint32_t *)&rspace[4 + i * 4];
*tmp_rspace = rts->route[i];
}
if (setsockopt(sock->fd, IPPROTO_IP, IP_OPTIONS, rspace, 4 + rts->nroute * 4) < 0)
error(2, errno, "record route");
rts->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 = rts->datalen + 8;
hold += ((hold + 511) / 512) * (rts->optlen + 20 + 16 + 64 + 160);
sock_setbufs(rts, sock, hold);
if (rts->broadcast_pings) {
if (setsockopt(sock->fd, SOL_SOCKET, SO_BROADCAST, &rts->broadcast_pings,
sizeof rts->broadcast_pings) < 0)
error(2, errno, _("cannot set broadcasting"));
}
if (rts->opt_noloop) {
int loop = 0;
if (setsockopt(sock->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof loop) == -1)
error(2, errno, _("cannot disable multicast loopback"));
}
if (rts->opt_ttl) {
int ittl = rts->ttl;
if (setsockopt(sock->fd, IPPROTO_IP, IP_MULTICAST_TTL, &rts->ttl, sizeof rts->ttl) == -1)
error(2, errno, _("cannot set multicast time-to-live"));
if (setsockopt(sock->fd, IPPROTO_IP, IP_TTL, &ittl, sizeof ittl) == -1)
error(2, errno, _("cannot set unicast time-to-live"));
}
if (rts->datalen >= (int)sizeof(struct timeval)) /* can we time transfer */
rts->timing = 1;