/*
Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
This file is part of libzmq, the ZeroMQ core engine in C++.
libzmq is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
As a special exception, the Contributors give you permission to link
this library with independent modules to produce an executable,
regardless of the license terms of these independent modules, and to
copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the
terms and conditions of the license of that module. An independent
module is a module which is not derived from or based on this library.
If you modify this library, you must extend this exception to your
version of the library.
libzmq is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.hpp"
#include <string>
#include <sstream>
#include "macros.hpp"
#include "tcp_address.hpp"
#include "stdint.hpp"
#include "err.hpp"
#include "ip.hpp"
#ifndef ZMQ_HAVE_WINDOWS
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <netdb.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#endif
#ifdef ZMQ_HAVE_SOLARIS
#include <sys/sockio.h>
// On Solaris platform, network interface name can be queried by ioctl.
int zmq::tcp_address_t::resolve_nic_name (const char *nic_, bool ipv6_, bool is_src_)
{
// TODO: Unused parameter, IPv6 support not implemented for Solaris.
LIBZMQ_UNUSED (ipv6_);
// Create a socket.
const int fd = open_socket (AF_INET, SOCK_DGRAM, 0);
errno_assert (fd != -1);
// Retrieve number of interfaces.
lifnum ifn;
ifn.lifn_family = AF_INET;
ifn.lifn_flags = 0;
int rc = ioctl (fd, SIOCGLIFNUM, (char*) &ifn);
errno_assert (rc != -1);
// Allocate memory to get interface names.
const size_t ifr_size = sizeof (struct lifreq) * ifn.lifn_count;
char *ifr = (char*) malloc (ifr_size);
alloc_assert (ifr);
// Retrieve interface names.
lifconf ifc;
ifc.lifc_family = AF_INET;
ifc.lifc_flags = 0;
ifc.lifc_len = ifr_size;
ifc.lifc_buf = ifr;
rc = ioctl (fd, SIOCGLIFCONF, (char*) &ifc);
errno_assert (rc != -1);
// Find the interface with the specified name and AF_INET family.
bool found = false;
lifreq *ifrp = ifc.lifc_req;
for (int n = 0; n < (int) (ifc.lifc_len / sizeof (lifreq));
n ++, ifrp ++) {
if (!strcmp (nic_, ifrp->lifr_name)) {
rc = ioctl (fd, SIOCGLIFADDR, (char*) ifrp);
errno_assert (rc != -1);
if (ifrp->lifr_addr.ss_family == AF_INET) {
if (is_src_)
source_address.ipv4 = *(sockaddr_in*) &ifrp->lifr_addr;
else
address.ipv4 = *(sockaddr_in*) &ifrp->lifr_addr;
found = true;
break;
}
}
}
// Clean-up.
free (ifr);
close (fd);
if (!found) {
errno = ENODEV;
return -1;
}
return 0;
}
#elif defined ZMQ_HAVE_AIX || defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_ANDROID
#include <sys/ioctl.h>
int zmq::tcp_address_t::resolve_nic_name (const char *nic_, bool ipv6_, bool is_src_)
{
#if defined ZMQ_HAVE_AIX || defined ZMQ_HAVE_HPUX
// IPv6 support not implemented for AIX or HP/UX.
if (ipv6_)
{
errno = ENODEV;
return -1;
}
#endif
// Create a socket.
const int sd = open_socket (ipv6_ ? AF_INET6 : AF_INET, SOCK_DGRAM, 0);
errno_assert (sd != -1);
struct ifreq ifr;
// Copy interface name for ioctl get.
strncpy (ifr.ifr_name, nic_, sizeof (ifr.ifr_name) );
// Fetch interface address.
const int rc = ioctl (sd, SIOCGIFADDR, (caddr_t) &ifr, sizeof (ifr) );
// Clean up.
close (sd);
if (rc == -1) {
errno = ENODEV;
return -1;
}
const int family = ifr.ifr_addr.sa_family;
if (family == (ipv6_ ? AF_INET6 : AF_INET)
&& !strcmp (nic_, ifr.ifr_name))
{
if (is_src_)
memcpy (&source_address, &ifr.ifr_addr,
(family == AF_INET) ? sizeof (struct sockaddr_in)
: sizeof (struct sockaddr_in6));
else
memcpy (&address, &ifr.ifr_addr,
(family == AF_INET) ? sizeof (struct sockaddr_in)
: sizeof (struct sockaddr_in6));
}
else
{
errno = ENODEV;
return -1;
}
return 0;
}
#elif ((defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENBSD ||\
defined ZMQ_HAVE_QNXNTO || defined ZMQ_HAVE_NETBSD ||\
defined ZMQ_HAVE_DRAGONFLY || defined ZMQ_HAVE_GNU)\
&& defined ZMQ_HAVE_IFADDRS)
#include <ifaddrs.h>
// On these platforms, network interface name can be queried
// using getifaddrs function.
int zmq::tcp_address_t::resolve_nic_name (const char *nic_, bool ipv6_, bool is_src_)
{
// Get the addresses.
ifaddrs *ifa = NULL;
int rc = 0;
const int max_attempts = 10;
const int backoff_msec = 1;
for (int i = 0; i < max_attempts; i++) {
rc = getifaddrs (&ifa);
if (rc == 0 || (rc < 0 && errno != ECONNREFUSED))
break;
usleep ((backoff_msec << i) * 1000);
}
if (rc != 0 && ((errno == EINVAL) || (errno==EOPNOTSUPP))) {
// Windows Subsystem for Linux compatibility
LIBZMQ_UNUSED (nic_);
LIBZMQ_UNUSED (ipv6_);
errno = ENODEV;
return -1;
}
errno_assert (rc == 0);
zmq_assert (ifa != NULL);
// Find the corresponding network interface.
bool found = false;
for (ifaddrs *ifp = ifa; ifp != NULL; ifp = ifp->ifa_next) {
if (ifp->ifa_addr == NULL)
continue;
const int family = ifp->ifa_addr->sa_family;
if (family == (ipv6_ ? AF_INET6 : AF_INET)
&& !strcmp (nic_, ifp->ifa_name)) {
if (is_src_)
memcpy (&source_address, ifp->ifa_addr,
(family == AF_INET) ? sizeof (struct sockaddr_in)
: sizeof (struct sockaddr_in6));
else
memcpy (&address, ifp->ifa_addr,
(family == AF_INET) ? sizeof (struct sockaddr_in)
: sizeof (struct sockaddr_in6));
found = true;
break;
}
}
// Clean-up;
freeifaddrs (ifa);
if (!found) {
errno = ENODEV;
return -1;
}
return 0;
}
#elif (defined ZMQ_HAVE_WINDOWS)
#include <netioapi.h>
int zmq::tcp_address_t::get_interface_name(unsigned long index, char ** dest) const {
#ifdef ZMQ_HAVE_WINDOWS_UWP
char * buffer = (char*)malloc(1024);
#else
char * buffer = (char*)malloc(IF_MAX_STRING_SIZE);
#endif
alloc_assert(buffer);
char * if_name_result = NULL;
#if !defined ZMQ_HAVE_WINDOWS_TARGET_XP && !defined ZMQ_HAVE_WINDOWS_UWP
if_name_result = if_indextoname(index, buffer);
#endif
if (if_name_result == NULL) {
free(buffer);
return -1;
}
*dest = buffer;
return 0;
}
int zmq::tcp_address_t::wchar_to_utf8(const WCHAR * src, char ** dest) const {
int rc;
int buffer_len = WideCharToMultiByte(CP_UTF8, 0,
src, -1,
NULL, 0,
NULL, 0);
char * buffer = (char*) malloc(buffer_len);
alloc_assert(buffer);
rc = WideCharToMultiByte(CP_UTF8, 0,
src, -1,
buffer, buffer_len,
NULL, 0);
if (rc == 0) {
free(buffer);
return -1;
}
*dest = buffer;
return 0;
}
int zmq::tcp_address_t::resolve_nic_name(const char *nic_, bool ipv6_, bool is_src_)
{
int rc;
bool found = false;
const int max_attempts = 10;
int iterations = 0;
IP_ADAPTER_ADDRESSES * addresses = NULL;
IP_ADAPTER_ADDRESSES * current_addresses = NULL;
unsigned long out_buf_len = sizeof(IP_ADAPTER_ADDRESSES);
do {
addresses = (IP_ADAPTER_ADDRESSES *) malloc(out_buf_len);
alloc_assert(addresses);
rc = GetAdaptersAddresses(AF_UNSPEC,
GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER,
NULL,
addresses, &out_buf_len);
if (rc == ERROR_BUFFER_OVERFLOW) {
free(addresses);
addresses = NULL;
}
else {
break;
}
iterations++;
} while ((rc == ERROR_BUFFER_OVERFLOW) && (iterations < max_attempts));
if (rc == 0) {
current_addresses = addresses;
while (current_addresses) {
char * if_name = NULL;
char * if_friendly_name = NULL;
int str_rc1, str_rc2;
str_rc1 = get_interface_name(current_addresses->IfIndex, &if_name);
str_rc2 = wchar_to_utf8(current_addresses->FriendlyName, &if_friendly_name);
// Find a network adapter by its "name" or "friendly name"
if (
((str_rc1 == 0) && (!strcmp(nic_, if_name)))
|| ((str_rc2 == 0) && (!strcmp(nic_, if_friendly_name)))
) {
// Iterate over all unicast addresses bound to the current network interface
IP_ADAPTER_UNICAST_ADDRESS * unicast_address = current_addresses->FirstUnicastAddress;
IP_ADAPTER_UNICAST_ADDRESS * current_unicast_address = unicast_address;
while (current_unicast_address) {
ADDRESS_FAMILY family = current_unicast_address->Address.lpSockaddr->sa_family;
if (family == (ipv6_ ? AF_INET6 : AF_INET)) {
if (is_src_)
memcpy(&source_address, current_unicast_address->Address.lpSockaddr,
(family == AF_INET) ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6));
else
memcpy(&address, current_unicast_address->Address.lpSockaddr,
(family == AF_INET) ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6));
found = true;
break;
}
current_unicast_address = current_unicast_address->Next;
}
if (found) break;
}
if (str_rc1 == 0) free(if_name);
if (str_rc2 == 0) free(if_friendly_name);
current_addresses = current_addresses->Next;
}
free(addresses);
}
if (!found) {
errno = ENODEV;
return -1;
}
return 0;
}
#else
// On other platforms we assume there are no sane interface names.
int zmq::tcp_address_t::resolve_nic_name (const char *nic_, bool ipv6_, bool is_src_)
{
LIBZMQ_UNUSED (nic_);
LIBZMQ_UNUSED (ipv6_);
errno = ENODEV;
return -1;
}
#endif
int zmq::tcp_address_t::resolve_interface (const char *interface_, bool ipv6_, bool is_src_)
{
// Initialize temporary output pointers with storage address.
sockaddr_storage ss;
sockaddr *out_addr = (sockaddr*) &ss;
size_t out_addrlen;
// Initialise IP-format family/port and populate temporary output pointers
// with the address.
if (ipv6_) {
sockaddr_in6 ip6_addr;
memset (&ip6_addr, 0, sizeof (ip6_addr) );
ip6_addr.sin6_family = AF_INET6;
memcpy (&ip6_addr.sin6_addr, &in6addr_any, sizeof (in6addr_any) );
out_addrlen = sizeof (ip6_addr);
memcpy (out_addr, &ip6_addr, out_addrlen);
}
else {
sockaddr_in ip4_addr;
memset (&ip4_addr, 0, sizeof (ip4_addr) );
ip4_addr.sin_family = AF_INET;
ip4_addr.sin_addr.s_addr = htonl (INADDR_ANY);
out_addrlen = sizeof (ip4_addr);
memcpy (out_addr, &ip4_addr, out_addrlen);
}
// "*" resolves to INADDR_ANY or in6addr_any.
if (strcmp (interface_, "*") == 0) {
zmq_assert (out_addrlen <= sizeof (address) );
if (is_src_)
memcpy (&source_address, out_addr, out_addrlen);
else
memcpy (&address, out_addr, out_addrlen);
return 0;
}
// Try to resolve the string as a NIC name.
int rc = resolve_nic_name (interface_, ipv6_, is_src_);
if (rc == 0 || errno != ENODEV)
return rc;
// There's no such interface name. Assume literal address.
#if defined ZMQ_HAVE_OPENVMS && defined __ia64
__addrinfo64 *res = NULL;
__addrinfo64 req;
#else
addrinfo *res = NULL;
addrinfo req;
#endif
memset (&req, 0, sizeof (req) );
// Choose IPv4 or IPv6 protocol family. Note that IPv6 allows for
// IPv4-in-IPv6 addresses.
req.ai_family = ipv6_? AF_INET6: AF_INET;
// Arbitrary, not used in the output, but avoids duplicate results.
req.ai_socktype = SOCK_STREAM;
// Restrict hostname/service to literals to avoid any DNS lookups or
// service-name irregularity due to indeterminate socktype.
req.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
#if defined AI_V4MAPPED
// In this API we only require IPv4-mapped addresses when
// no native IPv6 interfaces are available (~AI_ALL).
// This saves an additional DNS roundtrip for IPv4 addresses.
if (req.ai_family == AF_INET6)
req.ai_flags |= AI_V4MAPPED;
#endif
// Resolve the literal address. Some of the error info is lost in case
// of error, however, there's no way to report EAI errors via errno.
rc = getaddrinfo(interface_, NULL, &req, &res);
#if defined AI_V4MAPPED
// Some OS do have AI_V4MAPPED defined but it is not supported in getaddrinfo()
// returning EAI_BADFLAGS. Detect this and retry
if (rc == EAI_BADFLAGS && (req.ai_flags & AI_V4MAPPED)) {
req.ai_flags &= ~AI_V4MAPPED;
rc = getaddrinfo(interface_, NULL, &req, &res);
}
#endif
#if defined ZMQ_HAVE_WINDOWS
// Resolve specific case on Windows platform when using IPv4 address
// with ZMQ_IPv6 socket option.
if ((req.ai_family == AF_INET6) && (rc == WSAHOST_NOT_FOUND)) {
req.ai_family = AF_INET;
rc = getaddrinfo(interface_, NULL, &req, &res);
}
#endif
if (rc) {
errno = ENODEV;
return -1;
}
// Use the first result.
zmq_assert (res != NULL);
zmq_assert ((size_t) res->ai_addrlen <= sizeof (address) );
if (is_src_)
memcpy (&source_address, res->ai_addr, res->ai_addrlen);
else
memcpy (&address, res->ai_addr, res->ai_addrlen);
// Cleanup getaddrinfo after copying the possibly referenced result.
freeaddrinfo (res);
return 0;
}
int zmq::tcp_address_t::resolve_hostname (const char *hostname_, bool ipv6_, bool is_src_)
{
// Set up the query.
#if defined ZMQ_HAVE_OPENVMS && defined __ia64 && __INITIAL_POINTER_SIZE == 64
__addrinfo64 req;
#else
addrinfo req;
#endif
memset (&req, 0, sizeof (req) );
// Choose IPv4 or IPv6 protocol family. Note that IPv6 allows for
// IPv4-in-IPv6 addresses.
req.ai_family = ipv6_? AF_INET6: AF_INET;
// Need to choose one to avoid duplicate results from getaddrinfo() - this
// doesn't really matter, since it's not included in the addr-output.
req.ai_socktype = SOCK_STREAM;
#if defined AI_V4MAPPED
// In this API we only require IPv4-mapped addresses when
// no native IPv6 interfaces are available.
// This saves an additional DNS roundtrip for IPv4 addresses.
if (req.ai_family == AF_INET6)
req.ai_flags |= AI_V4MAPPED;
#endif
// Resolve host name. Some of the error info is lost in case of error,
// however, there's no way to report EAI errors via errno.
#if defined ZMQ_HAVE_OPENVMS && defined __ia64 && __INITIAL_POINTER_SIZE == 64
__addrinfo64 *res;
#else
addrinfo *res;
#endif
int rc = getaddrinfo (hostname_, NULL, &req, &res);
#if defined AI_V4MAPPED
// Some OS do have AI_V4MAPPED defined but it is not supported in getaddrinfo()
// returning EAI_BADFLAGS. Detect this and retry
if (rc == EAI_BADFLAGS && (req.ai_flags & AI_V4MAPPED)) {
req.ai_flags &= ~AI_V4MAPPED;
rc = getaddrinfo(hostname_, NULL, &req, &res);
}
#endif
if (rc) {
switch (rc) {
case EAI_MEMORY:
errno = ENOMEM;
break;
default:
errno = EINVAL;
break;
}
return -1;
}
// Copy first result to output addr with hostname and service.
zmq_assert ((size_t) res->ai_addrlen <= sizeof (address) );
if (is_src_)
memcpy (&source_address, res->ai_addr, res->ai_addrlen);
else
memcpy (&address, res->ai_addr, res->ai_addrlen);
freeaddrinfo (res);
return 0;
}
zmq::tcp_address_t::tcp_address_t () :
_has_src_addr (false)
{
memset (&address, 0, sizeof (address) );
memset (&source_address, 0, sizeof (source_address) );
}
zmq::tcp_address_t::tcp_address_t (const sockaddr *sa, socklen_t sa_len) :
_has_src_addr (false)
{
zmq_assert (sa && sa_len > 0);
memset (&address, 0, sizeof (address) );
memset (&source_address, 0, sizeof (source_address) );
if (sa->sa_family == AF_INET && sa_len >= (socklen_t) sizeof (address.ipv4) )
memcpy (&address.ipv4, sa, sizeof (address.ipv4) );
else
if (sa->sa_family == AF_INET6 && sa_len >= (socklen_t) sizeof (address.ipv6) )
memcpy (&address.ipv6, sa, sizeof (address.ipv6) );
}
zmq::tcp_address_t::~tcp_address_t ()
{
}
int zmq::tcp_address_t::resolve (const char *name_, bool local_, bool ipv6_, bool is_src_)
{
if (!is_src_) {
// Test the ';' to know if we have a source address in name_
const char *src_delimiter = strrchr (name_, ';');
if (src_delimiter) {
std::string src_name (name_, src_delimiter - name_);
const int rc = resolve (src_name.c_str (), local_, ipv6_, true);
if (rc != 0)
return -1;
name_ = src_delimiter + 1;
_has_src_addr = true;
}
}
// Find the ':' at end that separates address from the port number.
const char *delimiter = strrchr (name_, ':');
if (!delimiter) {
errno = EINVAL;
return -1;
}
// Separate the address/port.
std::string addr_str (name_, delimiter - name_);
std::string port_str (delimiter + 1);
// Remove square brackets around the address, if any, as used in IPv6
if (addr_str.size () >= 2 && addr_str [0] == '[' &&
addr_str [addr_str.size () - 1] == ']')
addr_str = addr_str.substr (1, addr_str.size () - 2);
// Test the '%' to know if we have an interface name / zone_id in the address
// Reference: https://tools.ietf.org/html/rfc4007
std::size_t pos = addr_str.rfind('%');
uint32_t zone_id = 0;
if (pos != std::string::npos) {
std::string if_str = addr_str.substr(pos + 1);
addr_str = addr_str.substr(0, pos);
if (isalpha (if_str.at (0)))
#if !defined ZMQ_HAVE_WINDOWS_TARGET_XP && !defined ZMQ_HAVE_WINDOWS_UWP
zone_id = if_nametoindex(if_str.c_str());
#else
// The function 'if_nametoindex' is not supported on Windows XP.
// If we are targeting XP using a vxxx_xp toolset then fail.
// This is brutal as this code could be run on later windows clients
// meaning the IPv6 zone_id cannot have an interface name.
// This could be fixed with a runtime check.
zone_id = 0;
#endif
else
zone_id = (uint32_t) atoi (if_str.c_str ());
if (zone_id == 0) {
errno = EINVAL;
return -1;
}
}
// Allow 0 specifically, to detect invalid port error in atoi if not
uint16_t port;
if (port_str == "*" || port_str == "0")
// Resolve wildcard to 0 to allow autoselection of port
port = 0;
else {
// Parse the port number (0 is not a valid port).
port = (uint16_t) atoi (port_str.c_str ());
if (port == 0) {
errno = EINVAL;
return -1;
}
}
// Resolve the IP address.
int rc;
if (local_ || is_src_)
rc = resolve_interface (addr_str.c_str (), ipv6_, is_src_);
else
rc = resolve_hostname (addr_str.c_str (), ipv6_, is_src_);
if (rc != 0)
return -1;
// Set the port into the address structure.
if (is_src_) {
if (source_address.generic.sa_family == AF_INET6) {
source_address.ipv6.sin6_port = htons (port);
source_address.ipv6.sin6_scope_id = zone_id;
}
else
source_address.ipv4.sin_port = htons (port);
}
else {
if (address.generic.sa_family == AF_INET6) {
address.ipv6.sin6_port = htons (port);
address.ipv6.sin6_scope_id = zone_id;
}
else
address.ipv4.sin_port = htons (port);
}
return 0;
}
int zmq::tcp_address_t::to_string (std::string &addr_)
{
if (address.generic.sa_family != AF_INET
&& address.generic.sa_family != AF_INET6) {
addr_.clear ();
return -1;
}
// Not using service resolving because of
// https://github.com/zeromq/libzmq/commit/1824574f9b5a8ce786853320e3ea09fe1f822bc4
char hbuf [NI_MAXHOST];
int rc = getnameinfo (addr (), addrlen (), hbuf, sizeof (hbuf), NULL, 0, NI_NUMERICHOST);
if (rc != 0) {
addr_.clear ();
return rc;
}
if (address.generic.sa_family == AF_INET6) {
std::stringstream s;
s << "tcp://[" << hbuf << "]:" << ntohs (address.ipv6.sin6_port);
addr_ = s.str ();
}
else {
std::stringstream s;
s << "tcp://" << hbuf << ":" << ntohs (address.ipv4.sin_port);
addr_ = s.str ();
}
return 0;
}
const sockaddr *zmq::tcp_address_t::addr () const
{
return &address.generic;
}
socklen_t zmq::tcp_address_t::addrlen () const
{
if (address.generic.sa_family == AF_INET6)
return (socklen_t) sizeof (address.ipv6);
else
return (socklen_t) sizeof (address.ipv4);
}
const sockaddr *zmq::tcp_address_t::src_addr () const
{
return &source_address.generic;
}
socklen_t zmq::tcp_address_t::src_addrlen () const
{
if (address.generic.sa_family == AF_INET6)
return (socklen_t) sizeof (source_address.ipv6);
else
return (socklen_t) sizeof (source_address.ipv4);
}
bool zmq::tcp_address_t::has_src_addr () const
{
return _has_src_addr;
}
#if defined ZMQ_HAVE_WINDOWS
unsigned short zmq::tcp_address_t::family () const
#else
sa_family_t zmq::tcp_address_t::family () const
#endif
{
return address.generic.sa_family;
}
zmq::tcp_address_mask_t::tcp_address_mask_t () :
tcp_address_t (),
address_mask (-1)
{
}
int zmq::tcp_address_mask_t::mask () const
{
return address_mask;
}
int zmq::tcp_address_mask_t::resolve (const char *name_, bool ipv6_)
{
// Find '/' at the end that separates address from the cidr mask number.
// Allow empty mask clause and treat it like '/32' for ipv4 or '/128' for ipv6.
std::string addr_str, mask_str;
const char *delimiter = strrchr (name_, '/');
if (delimiter != NULL) {
addr_str.assign (name_, delimiter - name_);
mask_str.assign (delimiter + 1);
if (mask_str.empty ()) {
errno = EINVAL;
return -1;
}
}
else
addr_str.assign (name_);
// Parse address part using standard routines.
const int rc =
tcp_address_t::resolve_hostname (addr_str.c_str (), ipv6_);
if (rc != 0)
return rc;
// Parse the cidr mask number.
if (mask_str.empty ()) {
if (address.generic.sa_family == AF_INET6)
address_mask = 128;
else
address_mask = 32;
}
else
if (mask_str == "0")
address_mask = 0;
else {
const int mask = atoi (mask_str.c_str ());
if (
(mask < 1) ||
(address.generic.sa_family == AF_INET6 && mask > 128) ||
(address.generic.sa_family != AF_INET6 && mask > 32)
) {
errno = EINVAL;
return -1;
}
address_mask = mask;
}
return 0;
}
int zmq::tcp_address_mask_t::to_string (std::string &addr_)
{
if (address.generic.sa_family != AF_INET
&& address.generic.sa_family != AF_INET6) {
addr_.clear ();
return -1;
}
if (address_mask == -1) {
addr_.clear ();
return -1;
}
char hbuf [NI_MAXHOST];
int rc = getnameinfo (addr (), addrlen (), hbuf, sizeof (hbuf), NULL, 0, NI_NUMERICHOST);
if (rc != 0) {
addr_.clear ();
return rc;
}
if (address.generic.sa_family == AF_INET6) {
std::stringstream s;
s << "[" << hbuf << "]/" << address_mask;
addr_ = s.str ();
}
else {
std::stringstream s;
s << hbuf << "/" << address_mask;
addr_ = s.str ();
}
return 0;
}
bool zmq::tcp_address_mask_t::match_address (const struct sockaddr *ss, const socklen_t ss_len) const
{
zmq_assert (address_mask != -1
&& ss != NULL
&& ss_len >= (socklen_t) sizeof (struct sockaddr));
if (ss->sa_family != address.generic.sa_family)
return false;
if (address_mask > 0) {
int mask;
const uint8_t *our_bytes, *their_bytes;
if (ss->sa_family == AF_INET6) {
zmq_assert (ss_len == sizeof (struct sockaddr_in6));
their_bytes = (const uint8_t *) &(((const struct sockaddr_in6 *) ss)->sin6_addr);
our_bytes = (const uint8_t *) &address.ipv6.sin6_addr;
mask = sizeof (struct in6_addr) * 8;
}
else {
zmq_assert (ss_len == sizeof (struct sockaddr_in));
their_bytes = (const uint8_t *) &(((const struct sockaddr_in *) ss)->sin_addr);
our_bytes = (const uint8_t *) &address.ipv4.sin_addr;
mask = sizeof (struct in_addr) * 8;
}
if (address_mask < mask)
mask = address_mask;
const size_t full_bytes = mask / 8;
if (memcmp (our_bytes, their_bytes, full_bytes))
return false;
const uint8_t last_byte_bits = 0xffU << (8 - mask % 8);
if (last_byte_bits) {
if ((their_bytes [full_bytes] & last_byte_bits) != (our_bytes [full_bytes] & last_byte_bits))
return false;
}
}
return true;
}