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ping6_common.c
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/*
*
* Modified for AF_INET6 by Pedro Roque
*
*
* Original copyright notice included bellow
*/
/*
* 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 non-raw ICMP sockets or
* if -N option is used, this program has to run SUID to ROOT or
* with net_cap_raw enabled.
*/
#include "ping.h"
ping_func_set_st ping6_func_set = {
.send_probe = ping6_send_probe,
.receive_error_msg = ping6_receive_error_msg,
.parse_reply = ping6_parse_reply,
.install_filter = ping6_install_filter
};
#ifndef SCOPE_DELIMITER
# define SCOPE_DELIMITER '%'
#endif
uint32_t flowlabel;
uint32_t tclass;
static struct sockaddr_in6 whereto;
static struct sockaddr_in6 firsthop;
static unsigned char cmsgbuf[4096];
static size_t cmsglen = 0;
static int pr_icmph(uint8_t type, uint8_t code, uint32_t info);
struct sockaddr_in6 source6 = { .sin6_family = AF_INET6 };
extern char *device;
#if defined(USE_GCRYPT) || defined(USE_OPENSSL) || defined(USE_NETTLE)
#include "iputils_md5dig.h"
#define USE_CRYPTO
#endif
/* Node Information query */
int ni_query = -1;
int ni_flag = 0;
void *ni_subject = NULL;
int ni_subject_len = 0;
int ni_subject_type = -1;
char *ni_group;
static inline int ntohsp(uint16_t *p)
{
uint16_t v;
memcpy(&v, p, sizeof(v));
return ntohs(v);
}
unsigned int if_name2index(const char *ifname)
{
unsigned int i = if_nametoindex(ifname);
if (!i)
error(2, 0, "unknown iface: %s", ifname);
return i;
}
struct niquery_option {
char *name;
int namelen;
int has_arg;
int data;
int (*handler)(int index, const char *arg);
};
#define NIQUERY_OPTION(_name, _has_arg, _data, _handler) \
{ \
.name = _name, \
.namelen = sizeof(_name) - 1, \
.has_arg = _has_arg, \
.data = _data, \
.handler = _handler \
}
static int niquery_option_name_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)));
static int niquery_option_ipv6_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)));
static int niquery_option_ipv6_flag_handler(int index, const char *arg);
static int niquery_option_ipv4_handler(int index, const char *arg);
static int niquery_option_ipv4_flag_handler(int index, const char *arg);
static int niquery_option_subject_addr_handler(int index, const char *arg);
static int niquery_option_subject_name_handler(int index, const char *arg);
static int niquery_option_help_handler(int index, const char *arg);
struct niquery_option niquery_options[] = {
NIQUERY_OPTION("name", 0, 0, niquery_option_name_handler),
NIQUERY_OPTION("fqdn", 0, 0, niquery_option_name_handler),
NIQUERY_OPTION("ipv6", 0, 0, niquery_option_ipv6_handler),
NIQUERY_OPTION("ipv6-all", 0, NI_IPV6ADDR_F_ALL, niquery_option_ipv6_flag_handler),
NIQUERY_OPTION("ipv6-compatible", 0, NI_IPV6ADDR_F_COMPAT, niquery_option_ipv6_flag_handler),
NIQUERY_OPTION("ipv6-linklocal", 0, NI_IPV6ADDR_F_LINKLOCAL, niquery_option_ipv6_flag_handler),
NIQUERY_OPTION("ipv6-sitelocal", 0, NI_IPV6ADDR_F_SITELOCAL, niquery_option_ipv6_flag_handler),
NIQUERY_OPTION("ipv6-global", 0, NI_IPV6ADDR_F_GLOBAL, niquery_option_ipv6_flag_handler),
NIQUERY_OPTION("ipv4", 0, 0, niquery_option_ipv4_handler),
NIQUERY_OPTION("ipv4-all", 0, NI_IPV4ADDR_F_ALL, niquery_option_ipv4_flag_handler),
NIQUERY_OPTION("subject-ipv6", 1, NI_SUBJ_IPV6, niquery_option_subject_addr_handler),
NIQUERY_OPTION("subject-ipv4", 1, NI_SUBJ_IPV4, niquery_option_subject_addr_handler),
NIQUERY_OPTION("subject-name", 1, 0, niquery_option_subject_name_handler),
NIQUERY_OPTION("subject-fqdn", 1, -1, niquery_option_subject_name_handler),
NIQUERY_OPTION("help", 0, 0, niquery_option_help_handler),
{NULL, 0, 0, 0, NULL}
};
static inline int niquery_is_enabled(void)
{
return ni_query >= 0;
}
#if PING6_NONCE_MEMORY
uint8_t *ni_nonce_ptr;
#else
struct {
struct timeval tv;
pid_t pid;
} ni_nonce_secret;
#endif
static void niquery_init_nonce(void)
{
#if PING6_NONCE_MEMORY
struct timeval tv;
unsigned long seed;
seed = (unsigned long)getpid();
if (!gettimeofday(&tv, NULL))
seed ^= tv.tv_usec;
srand(seed);
ni_nonce_ptr = calloc(NI_NONCE_SIZE, MAX_DUP_CHK);
if (!ni_nonce_ptr)
error(2, errno, "calloc");
ni_nonce_ptr[0] = ~0;
#else
gettimeofday(&ni_nonce_secret.tv, NULL);
ni_nonce_secret.pid = getpid();
#endif
}
#if !PING6_NONCE_MEMORY
static int niquery_nonce(uint8_t *nonce, int fill)
{
# ifdef USE_CRYPTO
static uint8_t digest[MD5_DIGEST_LENGTH];
static int seq = -1;
if (fill || seq != *(uint16_t *)nonce || seq < 0) {
MD5_CTX ctxt;
MD5_Init(&ctxt);
MD5_Update(&ctxt, &ni_nonce_secret, sizeof(ni_nonce_secret));
MD5_Update(&ctxt, nonce, sizeof(uint16_t));
MD5_Final(digest, &ctxt);
seq = *(uint16_t *)nonce;
}
if (fill) {
memcpy(nonce + sizeof(uint16_t), digest, NI_NONCE_SIZE - sizeof(uint16_t));
return 0;
} else {
if (memcmp(nonce + sizeof(uint16_t), digest, NI_NONCE_SIZE - sizeof(uint16_t)))
return -1;
return ntohsp((uint16_t *)nonce);
}
# else
error(3, ENOSYS, "niquery_nonce() crypto disabled");
# endif
}
#endif
static inline void niquery_fill_nonce(uint16_t seq, uint8_t *nonce)
{
uint16_t v = htons(seq);
#if PING6_NONCE_MEMORY
int i;
memcpy(&ni_nonce_ptr[NI_NONCE_SIZE * (seq % MAX_DUP_CHK)], &v, sizeof(v));
for (i = sizeof(v); i < NI_NONCE_SIZE; i++)
ni_nonce_ptr[NI_NONCE_SIZE * (seq % MAX_DUP_CHK) + i] = 0x100 * (rand() / (RAND_MAX + 1.0));
memcpy(nonce, &ni_nonce_ptr[NI_NONCE_SIZE * (seq % MAX_DUP_CHK)], NI_NONCE_SIZE);
#else
memcpy(nonce, &v, sizeof(v));
niquery_nonce(nonce, 1);
#endif
}
static inline int niquery_check_nonce(uint8_t *nonce)
{
#if PING6_NONCE_MEMORY
uint16_t seq = ntohsp((uint16_t *)nonce);
if (memcmp(nonce, &ni_nonce_ptr[NI_NONCE_SIZE * (seq % MAX_DUP_CHK)], NI_NONCE_SIZE))
return -1;
return seq;
#else
return niquery_nonce(nonce, 0);
#endif
}
static int niquery_set_qtype(int type)
{
if (niquery_is_enabled() && ni_query != type) {
printf("Qtype conflict\n");
return -1;
}
ni_query = type;
return 0;
}
static int niquery_option_name_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)))
{
if (niquery_set_qtype(NI_QTYPE_NAME) < 0)
return -1;
return 0;
}
static int niquery_option_ipv6_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)))
{
if (niquery_set_qtype(NI_QTYPE_IPV6ADDR) < 0)
return -1;
return 0;
}
static int niquery_option_ipv6_flag_handler(int index, const char *arg __attribute__((__unused__)))
{
if (niquery_set_qtype(NI_QTYPE_IPV6ADDR) < 0)
return -1;
ni_flag |= niquery_options[index].data;
return 0;
}
static int niquery_option_ipv4_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)))
{
if (niquery_set_qtype(NI_QTYPE_IPV4ADDR) < 0)
return -1;
return 0;
}
static int niquery_option_ipv4_flag_handler(int index, const char *arg __attribute__((__unused__)))
{
if (niquery_set_qtype(NI_QTYPE_IPV4ADDR) < 0)
return -1;
ni_flag |= niquery_options[index].data;
return 0;
}
static inline int niquery_is_subject_valid(void)
{
return ni_subject_type >= 0 && ni_subject;
}
static int niquery_set_subject_type(int type)
{
if (niquery_is_subject_valid() && ni_subject_type != type) {
printf("Subject type conflict\n");
return -1;
}
ni_subject_type = type;
return 0;
}
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#define OFFSET_OF(type,elem) ((size_t)&((type *)0)->elem)
static int niquery_option_subject_addr_handler(int index, const char *arg)
{
struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_DGRAM, .ai_flags = getaddrinfo_flags };
struct addrinfo *result, *ai;
int status;
int offset;
if (niquery_set_subject_type(niquery_options[index].data) < 0)
return -1;
ni_subject_type = niquery_options[index].data;
switch (niquery_options[index].data) {
case NI_SUBJ_IPV6:
ni_subject_len = sizeof(struct in6_addr);
offset = OFFSET_OF(struct sockaddr_in6, sin6_addr);
hints.ai_family = AF_INET6;
break;
case NI_SUBJ_IPV4:
ni_subject_len = sizeof(struct in_addr);
offset = OFFSET_OF(struct sockaddr_in, sin_addr);
hints.ai_family = AF_INET;
break;
default:
/* should not happen. */
offset = -1;
}
status = getaddrinfo(arg, 0, &hints, &result);
if (status) {
error(0, 0, "%s: %s", arg, gai_strerror(status));
return -1;
}
for (ai = result; ai; ai = ai->ai_next) {
void *p = malloc(ni_subject_len);
if (!p)
continue;
memcpy(p, (uint8_t *)ai->ai_addr + offset, ni_subject_len);
free(ni_subject);
ni_subject = p;
break;
}
freeaddrinfo(result);
return 0;
}
#ifdef USE_IDN
# if IDN2_VERSION_NUMBER >= 0x02000000
# define IDN2_FLAGS IDN2_NONTRANSITIONAL
# else
# define IDN2_FLAGS 0
# endif
#endif
#ifdef USE_CRYPTO
static int niquery_option_subject_name_handler(int index, const char *name)
{
static char nigroup_buf[INET6_ADDRSTRLEN + 1 + IFNAMSIZ];
unsigned char *dnptrs[2], **dpp, **lastdnptr;
int n;
size_t i;
char *p;
char *canonname = NULL, *idn = NULL;
unsigned char *buf = NULL;
size_t namelen;
size_t buflen;
int dots, fqdn = niquery_options[index].data;
MD5_CTX ctxt;
uint8_t digest[MD5_DIGEST_LENGTH];
#ifdef USE_IDN
int rc;
#endif
if (niquery_set_subject_type(NI_SUBJ_NAME) < 0)
return -1;
#ifdef USE_IDN
rc = idn2_lookup_ul(name, &idn, IDN2_FLAGS);
if (rc)
error(2, 0, "IDN encoding error: %s", idn2_strerror(rc));
#else
idn = strdup(name);
if (!idn)
goto oomexit;
#endif
p = strchr(idn, SCOPE_DELIMITER);
if (p) {
*p = '\0';
if (strlen(p + 1) >= IFNAMSIZ)
error(1, 0, "too long scope name");
}
namelen = strlen(idn);
canonname = malloc(namelen + 1);
if (!canonname)
goto oomexit;
dots = 0;
for (i = 0; i < namelen + 1; i++) {
canonname[i] = isupper(idn[i]) ? tolower(idn[i]) : idn[i];
if (idn[i] == '.')
dots++;
}
if (fqdn == 0) {
/* guess if hostname is FQDN */
fqdn = dots ? 1 : -1;
}
buflen = namelen + 3 + 1; /* dn_comp() requrires strlen() + 3,
plus non-fqdn indicator. */
buf = malloc(buflen);
if (!buf) {
error(0, errno, "memory allocation failed");
goto errexit;
}
dpp = dnptrs;
lastdnptr = &dnptrs[ARRAY_SIZE(dnptrs)];
*dpp++ = (unsigned char *)buf;
*dpp++ = NULL;
n = dn_comp(canonname, (unsigned char *)buf, buflen, dnptrs, lastdnptr);
if (n < 0) {
error(0, 0, "inappropriate subject name: %s", canonname);
goto errexit;
} else if ((size_t) n >= buflen) {
error(0, 0, "dn_comp() returned too long result");
goto errexit;
}
MD5_Init(&ctxt);
MD5_Update(&ctxt, buf, buf[0]);
MD5_Final(digest, &ctxt);
sprintf(nigroup_buf, "ff02::2:%02x%02x:%02x%02x%s%s",
digest[0], digest[1], digest[2], digest[3],
p ? "%" : "",
p ? p + 1 : "");
if (fqdn < 0)
buf[n] = 0;
free(ni_subject);
ni_group = nigroup_buf;
ni_subject = buf;
ni_subject_len = n + (fqdn < 0);
ni_group = nigroup_buf;
free(canonname);
free(idn);
return 0;
oomexit:
error(0, errno, "memory allocation failed");
errexit:
free(buf);
free(canonname);
free(idn);
exit(1);
}
#else
static int niquery_option_subject_name_handler(int index __attribute__((__unused__)),
const char *name __attribute__((__unused__)))
{
error(3, ENOSYS, "niquery_option_subject_name_handler() crypto disabled");
}
#endif
int niquery_option_help_handler(int index __attribute__((__unused__)), const char *arg __attribute__((__unused__)))
{
fprintf(stderr, "ping -6 -N <nodeinfo opt>\n"
"Help:\n"
" help\n"
"Query:\n"
" name\n"
" ipv6\n"
" ipv6-all\n"
" ipv6-compatible\n"
" ipv6-global\n"
" ipv6-linklocal\n"
" ipv6-sitelocal\n"
" ipv4\n"
" ipv4-all\n"
"Subject:\n"
" subject-ipv6=addr\n"
" subject-ipv4=addr\n"
" subject-name=name\n"
" subject-fqdn=name\n"
);
exit(2);
}
int niquery_option_handler(const char *opt_arg)
{
struct niquery_option *p;
int i;
int ret = -1;
for (i = 0, p = niquery_options; p->name; i++, p++) {
if (strncmp(p->name, opt_arg, p->namelen))
continue;
if (!p->has_arg) {
if (opt_arg[p->namelen] == '\0') {
ret = p->handler(i, NULL);
if (ret >= 0)
break;
}
} else {
if (opt_arg[p->namelen] == '=') {
ret = p->handler(i, &opt_arg[p->namelen] + 1);
if (ret >= 0)
break;
}
}
}
if (!p->name)
ret = niquery_option_help_handler(0, NULL);
return ret;
}
int ping6_run(int argc, char **argv, struct addrinfo *ai, struct socket_st *sock)
{
static const struct addrinfo hints = { .ai_family = AF_INET6, .ai_flags = getaddrinfo_flags };
struct addrinfo *result = NULL;
int status;
int hold, packlen;
unsigned char *packet;
char *target;
struct icmp6_filter filter;
int err;
static uint32_t scope_id = 0;
if (niquery_is_enabled()) {
niquery_init_nonce();
if (!niquery_is_subject_valid()) {
ni_subject = &whereto.sin6_addr;
ni_subject_len = sizeof(whereto.sin6_addr);
ni_subject_type = NI_SUBJ_IPV6;
}
}
if (argc > 1) {
usage();
} else if (argc == 1) {
target = *argv;
} else {
if (ni_query < 0 && ni_subject_type != NI_SUBJ_NAME)
usage();
target = ni_group;
}
if (!ai) {
status = getaddrinfo(target, NULL, &hints, &result);
if (status)
error(2, 0, "%s: %s", target, gai_strerror(status));
ai = result;
}
memcpy(&whereto, ai->ai_addr, sizeof(whereto));
whereto.sin6_port = htons(IPPROTO_ICMPV6);
if (result)
freeaddrinfo(result);
if (memchr(target, ':', strlen(target)))
options |= F_NUMERIC;
if (IN6_IS_ADDR_UNSPECIFIED(&firsthop.sin6_addr)) {
memcpy(&firsthop.sin6_addr, &whereto.sin6_addr, 16);
firsthop.sin6_scope_id = whereto.sin6_scope_id;
/* Verify scope_id is the same as intermediate nodes */
if (firsthop.sin6_scope_id && scope_id && firsthop.sin6_scope_id != scope_id)
error(2, 0, "scope discrepancy among the nodes");
else if (!scope_id)
scope_id = firsthop.sin6_scope_id;
}
hostname = target;
if (IN6_IS_ADDR_UNSPECIFIED(&source6.sin6_addr)) {
socklen_t alen;
int probe_fd = socket(AF_INET6, SOCK_DGRAM, 0);
if (probe_fd < 0)
error(2, errno, "socket");
if (device) {
unsigned int iface = if_name2index(device);
#ifdef IPV6_RECVPKTINFO
struct in6_pktinfo ipi;
memset(&ipi, 0, sizeof(ipi));
ipi.ipi6_ifindex = iface;
#endif
if (IN6_IS_ADDR_LINKLOCAL(&firsthop.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&firsthop.sin6_addr))
firsthop.sin6_scope_id = iface;
enable_capability_raw();
#ifdef IPV6_RECVPKTINFO
if (
setsockopt(probe_fd, IPPROTO_IPV6, IPV6_PKTINFO, &ipi, sizeof ipi) == -1 ||
setsockopt(sock->fd, IPPROTO_IPV6, IPV6_PKTINFO, &ipi, sizeof ipi) == -1) {
perror("setsockopt(IPV6_PKTINFO)");
exit(2);
}
#endif
if (
setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1 ||
setsockopt(sock->fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1) {
error(2, errno, "setsockopt(SO_BINDTODEVICE) %s", device);
}
disable_capability_raw();
}
if (!IN6_IS_ADDR_LINKLOCAL(&firsthop.sin6_addr) &&
!IN6_IS_ADDR_MC_LINKLOCAL(&firsthop.sin6_addr))
firsthop.sin6_family = AF_INET6;
firsthop.sin6_port = htons(1025);
if (connect(probe_fd, (struct sockaddr*)&firsthop, sizeof(firsthop)) == -1)
error(2, errno, "connect");
alen = sizeof source6;
if (getsockname(probe_fd, (struct sockaddr *) &source6, &alen) == -1)
error(2, errno, "getsockname");
source6.sin6_port = 0;
close(probe_fd);
if (device) {
struct ifaddrs *ifa0, *ifa;
if (getifaddrs(&ifa0))
error(2, errno, "getifaddrs");
for (ifa = ifa0; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_name || !ifa->ifa_addr ||
ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (!strcmp(ifa->ifa_name, device) &&
IN6_ARE_ADDR_EQUAL(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr,
&source6.sin6_addr))
break;
}
if (!ifa)
error(0, 0, "Warning: source address might be selected on device other than: %s", device);
freeifaddrs(ifa0);
}
}
else if (device && (IN6_IS_ADDR_LINKLOCAL(&source6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&source6.sin6_addr)))
source6.sin6_scope_id = if_name2index(device);
if (device) {
struct cmsghdr *cmsg;
struct in6_pktinfo *ipi;
cmsg = (struct cmsghdr*)(cmsgbuf+cmsglen);
cmsglen += CMSG_SPACE(sizeof(*ipi));
cmsg->cmsg_len = CMSG_LEN(sizeof(*ipi));
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
ipi = (struct in6_pktinfo*)CMSG_DATA(cmsg);
memset(ipi, 0, sizeof(*ipi));
ipi->ipi6_ifindex = if_name2index(device);
}
if ((whereto.sin6_addr.s6_addr16[0]&htons(0xff00)) == htons (0xff00)) {
if (uid) {
if (interval < 1000)
error(2, 0, "multicast ping with too short interval: %d", interval);
if (pmtudisc >= 0 && pmtudisc != IPV6_PMTUDISC_DO)
error(2, 0, "multicast ping does not fragment");
}
if (pmtudisc < 0)
pmtudisc = IPV6_PMTUDISC_DO;
}
if (pmtudisc >= 0) {
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MTU_DISCOVER, &pmtudisc, sizeof pmtudisc) == -1)
error(2, errno, "IPV6_MTU_DISCOVER");
}
if ((options&F_STRICTSOURCE) &&
bind(sock->fd, (struct sockaddr *) &source6, sizeof source6) == -1)
error(2, errno, "bind icmp socket");
if ((ssize_t) datalen >= (ssize_t) sizeof(struct timeval) && (ni_query < 0)) {
/* can we time transfer */
timing = 1;
}
packlen = datalen + 8 + 4096 + 40 + 8; /* 4096 for rthdr */
if (!(packet = (unsigned char *)malloc((unsigned int)packlen)))
error(2, errno, "memory allocation failed");
hold = 1;
/* 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)*(40+16+64+160);
sock_setbufs(sock, hold);
#ifdef __linux__
if (sock->socktype == SOCK_RAW) {
int csum_offset = 2;
int sz_opt = sizeof(int);
err = setsockopt(sock->fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sz_opt);
if (err < 0) {
/* checksum should be enabled by default and setting this
* option might fail anyway.
*/
error(0, errno, "setsockopt(RAW_CHECKSUM) failed - try to continue");
}
#else
{
#endif
/*
* select icmp echo reply as icmp type to receive
*/
ICMP6_FILTER_SETBLOCKALL(&filter);
ICMP6_FILTER_SETPASS(ICMP6_DST_UNREACH, &filter);
ICMP6_FILTER_SETPASS(ICMP6_PACKET_TOO_BIG, &filter);
ICMP6_FILTER_SETPASS(ICMP6_TIME_EXCEEDED, &filter);
ICMP6_FILTER_SETPASS(ICMP6_PARAM_PROB, &filter);
if (niquery_is_enabled())
ICMP6_FILTER_SETPASS(ICMPV6_NI_REPLY, &filter);
else
ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filter);
err = setsockopt(sock->fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof filter);
if (err < 0)
error(2, errno, "setsockopt(ICMP6_FILTER)");
}
if (options & F_NOLOOP) {
int loop = 0;
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof loop) == -1)
error(2, errno, "can't disable multicast loopback");
}
if (options & F_TTL) {
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof ttl) == -1)
error(2, errno, "can't set multicast hop limit");
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof ttl) == -1)
error(2, errno, "can't set unicast hop limit");
}
const int on = 1;
if (
#ifdef IPV6_RECVHOPLIMIT
setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof on) == -1 &&
setsockopt(sock->fd, IPPROTO_IPV6, IPV6_2292HOPLIMIT, &on, sizeof on) == -1
#else
setsockopt(sock->fd, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, sizeof on) == -1
#endif
)
error(2, errno, "can't receive hop limit");
if (options & F_TCLASS) {
#ifdef IPV6_TCLASS
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_TCLASS, &tclass, sizeof tclass) == -1)
error(2, errno, "setsockopt(IPV6_TCLASS)");
#else
error(0, 0, "traffic class is not supported");
#endif
}
if (options&F_FLOWINFO) {
#ifdef IPV6_FLOWLABEL_MGR
char freq_buf[CMSG_ALIGN(sizeof(struct in6_flowlabel_req)) + cmsglen];
struct in6_flowlabel_req *freq = (struct in6_flowlabel_req *)freq_buf;
int freq_len = sizeof(*freq);
memset(freq, 0, sizeof(*freq));
freq->flr_label = htonl(flowlabel & IPV6_FLOWINFO_FLOWLABEL);
freq->flr_action = IPV6_FL_A_GET;
freq->flr_flags = IPV6_FL_F_CREATE;
freq->flr_share = IPV6_FL_S_EXCL;
memcpy(&freq->flr_dst, &whereto.sin6_addr, 16);
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_FLOWLABEL_MGR, freq, freq_len) == -1)
error(2, errno, "can't set flowlabel");
flowlabel = freq->flr_label;
#else
error(2, 0, "flow labels are not supported");
#endif
#ifdef IPV6_FLOWINFO_SEND
whereto.sin6_flowinfo = flowlabel;
if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_FLOWINFO_SEND, &on, sizeof on) == -1)
error(2, errno, "can't send flowinfo");
#else
error(2, 0, "flowinfo is not supported");
#endif
}
printf("PING %s(%s) ", hostname, pr_addr(&whereto, sizeof whereto));
if (flowlabel)
printf(", flow 0x%05x, ", (unsigned)ntohl(flowlabel));
if (device || (options&F_STRICTSOURCE)) {
int saved_options = options;
options |= F_NUMERIC;
printf("from %s %s: ", pr_addr(&source6, sizeof source6), device ? device : "");
options = saved_options;
}
printf("%d data bytes\n", datalen);
setup(sock);
drop_capabilities();
main_loop(&ping6_func_set, sock, packet, packlen);
}
int ping6_receive_error_msg(socket_st *sock)
{
ssize_t res;
char cbuf[512];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct sock_extended_err *e;
struct icmp6_hdr icmph;
struct sockaddr_in6 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 == IPPROTO_IPV6) {
if (cmsg->cmsg_type == IPV6_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)
error(0, e->ee_errno, "local error");
else
error(0, 0, "local error: message too long, mtu: %u", e->ee_info);
nerrors++;
} else if (e->ee_origin == SO_EE_ORIGIN_ICMP6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)(e+1);
if ((size_t) res < sizeof(icmph) ||
memcmp(&target.sin6_addr, &whereto.sin6_addr, 16) ||
icmph.icmp6_type != ICMP6_ECHO_REQUEST ||
!is_ours(sock, icmph.icmp6_id)) {
/* Not our error, not an error at all. Clear. */
saved_errno = 0;
goto out;
}
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(sin6, sizeof *sin6), ntohs(icmph.icmp6_seq));
pr_icmph(e->ee_type, e->ee_code, e->ee_info);
putchar('\n');
fflush(stdout);
}
}
out:
errno = saved_errno;
return net_errors ? 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 several bytes
* of the data portion are used to hold a UNIX "timeval" struct in VAX
* byte-order, to compute the round-trip time.
*/
int build_echo(uint8_t *_icmph, unsigned packet_size __attribute__((__unused__)))
{
struct icmp6_hdr *icmph;
int cc;
icmph = (struct icmp6_hdr *)_icmph;
icmph->icmp6_type = ICMP6_ECHO_REQUEST;
icmph->icmp6_code = 0;
icmph->icmp6_cksum = 0;
icmph->icmp6_seq = htons(ntransmitted+1);
icmph->icmp6_id = ident;
if (timing)
gettimeofday((struct timeval *)&_icmph[8],
(struct timezone *)NULL);
cc = datalen + 8; /* skips ICMP portion */
return cc;
}
int build_niquery(uint8_t *_nih, unsigned packet_size __attribute__((__unused__)))
{
struct ni_hdr *nih;
int cc;
nih = (struct ni_hdr *)_nih;
nih->ni_cksum = 0;
nih->ni_type = ICMPV6_NI_QUERY;
cc = sizeof(*nih);
datalen = 0;
niquery_fill_nonce(ntransmitted + 1, nih->ni_nonce);
nih->ni_code = ni_subject_type;
nih->ni_qtype = htons(ni_query);
nih->ni_flags = ni_flag;
memcpy(nih + 1, ni_subject, ni_subject_len);
cc += ni_subject_len;
return cc;
}
int ping6_send_probe(socket_st *sock, void *packet, unsigned packet_size)
{
int len, cc;
rcvd_clear(ntransmitted + 1);
if (niquery_is_enabled())
len = build_niquery(packet, packet_size);
else
len = build_echo(packet, packet_size);
if (cmsglen == 0) {
cc = sendto(sock->fd, (char *)packet, len, confirm,
(struct sockaddr *) &whereto,
sizeof(struct sockaddr_in6));
} else {
struct msghdr mhdr;
struct iovec iov;
iov.iov_len = len;