int zmq::resolve_ip_interface (sockaddr_in* addr_, char const *interface_)
{
// Find the ':' that separates NIC name from port.
const char *delimiter = strchr (interface_, ':');
if (!delimiter) {
errno = EINVAL;
return -1;
}
// Clean the structure and fill in protocol family.
memset (addr_, 0, sizeof (sockaddr_in));
addr_->sin_family = AF_INET;
// Resolve the name of the NIC.
std::string nic_name (interface_, delimiter - interface_);
if (resolve_nic_name (&addr_->sin_addr, nic_name.c_str ()) != 0)
return -1;
// Resolve the port.
addr_->sin_port = htons ((uint16_t) atoi (delimiter + 1));
if (!addr_->sin_port) {
errno = EINVAL;
return 0;
}
return 0;
}
int zmq::tcp_address_t::resolve_interface (const char *interface_,
bool ipv4only_)
{
// 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 (ipv4only_) {
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);
}
else {
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);
}
// * resolves to INADDR_ANY or in6addr_any.
if (strcmp (interface_, "*") == 0) {
zmq_assert (out_addrlen <= sizeof address);
memcpy (&address, out_addr, out_addrlen);
return 0;
}
// Try to resolve the string as a NIC name.
int rc = resolve_nic_name (interface_, ipv4only_);
if (rc != 0 && errno != ENODEV)
return rc;
if (rc == 0)
return 0;
// 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 = ipv4only_ ? AF_INET : AF_INET6;
// 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 && !defined ZMQ_HAVE_FREEBSD
// 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.
// Note: While the AI_V4MAPPED flag is defined on FreeBSD system,
// it is not supported here. See libzmq issue #331.
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 (rc) {
errno = ENODEV;
return -1;
}
// Use the first result.
zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (address));
memcpy (&address, res->ai_addr, res->ai_addrlen);
// Cleanup getaddrinfo after copying the possibly referenced result.
if (res)
freeaddrinfo (res);
return 0;
}
int zmq::resolve_ip_interface (sockaddr_storage* addr_, socklen_t *addr_len_,
char const *interface_)
{
// Find the ':' at end that separates NIC name from service.
const char *delimiter = strrchr (interface_, ':');
if (!delimiter) {
errno = EINVAL;
return -1;
}
// Separate the name/port.
std::string iface (interface_, delimiter - interface_);
std::string service (delimiter + 1);
// Initialize the output parameter.
memset (addr_, 0, sizeof (*addr_));
// Initialise IPv4-format family/port.
sockaddr_in ip4_addr;
memset (&ip4_addr, 0, sizeof (ip4_addr));
ip4_addr.sin_family = AF_INET;
ip4_addr.sin_port = htons ((uint16_t) atoi (service.c_str()));
// Initialize temporary output pointers with ip4_addr
sockaddr *out_addr = (sockaddr *) &ip4_addr;
size_t out_addrlen = sizeof (ip4_addr);
// 0 is not a valid port.
if (!ip4_addr.sin_port) {
errno = EINVAL;
return -1;
}
// * resolves to INADDR_ANY.
if (iface.compare("*") == 0) {
ip4_addr.sin_addr.s_addr = htonl (INADDR_ANY);
zmq_assert (out_addrlen <= sizeof (*addr_));
memcpy (addr_, out_addr, out_addrlen);
*addr_len_ = out_addrlen;
return 0;
}
// Try to resolve the string as a NIC name.
int rc = resolve_nic_name (&ip4_addr.sin_addr, iface.c_str());
if (rc != 0 && errno != ENODEV)
return rc;
if (rc == 0) {
zmq_assert (out_addrlen <= sizeof (*addr_));
memcpy (addr_, out_addr, out_addrlen);
*addr_len_ = out_addrlen;
return 0;
}
// There's no such interface name. Assume literal address.
addrinfo *res = NULL;
// Set up the query.
addrinfo req;
memset (&req, 0, sizeof (req));
// We only support IPv4 addresses for now.
req.ai_family = 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 | AI_NUMERICSERV;
// 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 (iface.c_str(), service.c_str(), &req, &res);
if (rc) {
errno = ENODEV;
return -1;
}
// Use the first result.
zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (*addr_));
memcpy (addr_, res->ai_addr, res->ai_addrlen);
*addr_len_ = res->ai_addrlen;
// Cleanup getaddrinfo after copying the possibly referenced result.
if (res)
freeaddrinfo (res);
return 0;
}
int zmq::ip_resolver_t::resolve (ip_addr_t *ip_addr_, const char *name_)
{
std::string addr;
uint16_t port;
if (options.expect_port ()) {
// We expect 'addr:port'. It's important to use str*r*chr to only get
// the latest colon since IPv6 addresses use colons as delemiters.
const char *delim = strrchr (name_, ':');
if (delim == NULL) {
errno = EINVAL;
return -1;
}
addr = std::string (name_, delim - name_);
std::string port_str = std::string (delim + 1);
if (port_str == "*") {
if (options.bindable ()) {
// Resolve wildcard to 0 to allow autoselection of port
port = 0;
} else {
errno = EINVAL;
return -1;
}
} else if (port_str == "0") {
// Using "0" for a bind address is equivalent to using "*". For a
// connectable address it could be used to connect to port 0.
port = 0;
} else {
// Parse the port number (0 is not a valid port).
port = static_cast<uint16_t> (atoi (port_str.c_str ()));
if (port == 0) {
errno = EINVAL;
return -1;
}
}
} else {
addr = std::string (name_);
port = 0;
}
// Trim any square brackets surrounding the address. Used for
// IPv6 addresses to remove the confusion with the port
// delimiter. Should we validate that the brackets are present if
// 'addr' contains ':' ?
if (addr.size () >= 2 && addr[0] == '[' && addr[addr.size () - 1] == ']') {
addr = addr.substr (1, addr.size () - 2);
}
// Look for an interface name / zone_id in the address
// Reference: https://tools.ietf.org/html/rfc4007
std::size_t pos = addr.rfind ('%');
uint32_t zone_id = 0;
if (pos != std::string::npos) {
std::string if_str = addr.substr (pos + 1);
addr = addr.substr (0, pos);
if (isalpha (if_str.at (0))) {
zone_id = do_if_nametoindex (if_str.c_str ());
} else {
zone_id = static_cast<uint32_t> (atoi (if_str.c_str ()));
}
if (zone_id == 0) {
errno = EINVAL;
return -1;
}
}
bool resolved = false;
const char *addr_str = addr.c_str ();
if (options.bindable () && addr == "*") {
// Return an ANY address
*ip_addr_ = ip_addr_t::any (options.ipv6 () ? AF_INET6 : AF_INET);
resolved = true;
}
if (!resolved && options.allow_nic_name ()) {
// Try to resolve the string as a NIC name.
int rc = resolve_nic_name (ip_addr_, addr_str);
if (rc == 0) {
resolved = true;
} else if (errno != ENODEV) {
return rc;
}
}
if (!resolved) {
int rc = resolve_getaddrinfo (ip_addr_, addr_str);
if (rc != 0) {
return rc;
}
resolved = true;
}
// Store the port into the structure. We could get 'getaddrinfo' to do it
// for us but since we don't resolve service names it's a bit overkill and
// we'd still have to do it manually when the address is resolved by
// 'resolve_nic_name'
ip_addr_->set_port (port);
if (ip_addr_->family () == AF_INET6) {
ip_addr_->ipv6.sin6_scope_id = zone_id;
}
assert (resolved == true);
return 0;
}