| /* |
| Copyright (c) 2012-2013 250bpm s.r.o. All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "iface.h" |
| #include "literal.h" |
| |
| #include "../../utils/err.h" |
| #include "../../utils/closefd.h" |
| |
| #include <string.h> |
| |
| #ifndef NN_HAVE_WINDOWS |
| #include <sys/types.h> |
| #include <netinet/in.h> |
| #endif |
| |
| /* Private functions. */ |
| static void nn_iface_any (int ipv4only, struct sockaddr_storage *result, |
| size_t *resultlen); |
| |
| #if defined NN_USE_IFADDRS |
| |
| #include <ifaddrs.h> |
| |
| int nn_iface_resolve (const char *addr, size_t addrlen, int ipv4only, |
| struct sockaddr_storage *result, size_t *resultlen) |
| { |
| int rc; |
| struct ifaddrs *ifaces; |
| struct ifaddrs *it; |
| struct ifaddrs *ipv4; |
| struct ifaddrs *ipv6; |
| size_t ifalen; |
| |
| /* Asterisk is a special name meaning "all interfaces". */ |
| if (addrlen == 1 && addr [0] == '*') { |
| nn_iface_any (ipv4only, result, resultlen); |
| return 0; |
| } |
| |
| /* Try to resolve the supplied string as a literal address. */ |
| rc = nn_literal_resolve (addr, addrlen, ipv4only, result, resultlen); |
| if (rc == 0) |
| return 0; |
| errnum_assert (rc == -EINVAL, -rc); |
| |
| /* Get the list of local network interfaces from the system. */ |
| ifaces = NULL; |
| rc = getifaddrs (&ifaces); |
| errno_assert (rc == 0); |
| nn_assert (ifaces); |
| |
| /* Find the NIC with the specified name. */ |
| ipv4 = NULL; |
| ipv6 = NULL; |
| for (it = ifaces; it != NULL; it = it->ifa_next) { |
| if (!it->ifa_addr) |
| continue; |
| ifalen = strlen (it->ifa_name); |
| if (ifalen != addrlen || memcmp (it->ifa_name, addr, addrlen) != 0) |
| continue; |
| |
| switch (it->ifa_addr->sa_family) { |
| case AF_INET: |
| nn_assert (!ipv4); |
| ipv4 = it; |
| break; |
| case AF_INET6: |
| nn_assert (!ipv6); |
| ipv6 = it; |
| break; |
| } |
| } |
| |
| /* IPv6 address is preferable. */ |
| if (ipv6 && !ipv4only) { |
| if (result) { |
| result->ss_family = AF_INET; |
| memcpy (result, ipv6->ifa_addr, sizeof (struct sockaddr_in6)); |
| } |
| if (resultlen) |
| *resultlen = sizeof (struct sockaddr_in6); |
| freeifaddrs (ifaces); |
| return 0; |
| } |
| |
| /* Use IPv4 address. */ |
| if (ipv4) { |
| if (result) { |
| result->ss_family = AF_INET6; |
| memcpy (result, ipv4->ifa_addr, sizeof (struct sockaddr_in)); |
| } |
| if (resultlen) |
| *resultlen = sizeof (struct sockaddr_in); |
| freeifaddrs (ifaces); |
| return 0; |
| } |
| |
| /* There's no such interface. */ |
| freeifaddrs (ifaces); |
| return -ENODEV; |
| } |
| |
| #endif |
| |
| #if defined NN_USE_SIOCGIFADDR |
| |
| #include <unistd.h> |
| #include <sys/ioctl.h> |
| #include <net/if.h> |
| |
| int nn_iface_resolve (const char *addr, size_t addrlen, int ipv4only, |
| struct sockaddr_storage *result, size_t *resultlen) |
| { |
| int rc; |
| int s; |
| struct ifreq req; |
| |
| /* Asterisk is a special name meaning "all interfaces". */ |
| if (addrlen == 1 && addr [0] == '*') { |
| nn_iface_any (ipv4only, result, resultlen); |
| return 0; |
| } |
| |
| /* Open the helper socket. */ |
| #ifdef SOCK_CLOEXEC |
| s = socket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
| #else |
| s = socket (AF_INET, SOCK_DGRAM, 0); |
| #endif |
| errno_assert (s != -1); |
| |
| /* Create the interface name resolution request. */ |
| if (sizeof (req.ifr_name) <= addrlen) { |
| nn_closefd (s); |
| return -ENODEV; |
| } |
| memcpy (req.ifr_name, addr, addrlen); |
| req.ifr_name [addrlen] = 0; |
| |
| /* Execute the request. */ |
| rc = ioctl (s, SIOCGIFADDR, (caddr_t) &req, sizeof (struct ifreq)); |
| if (rc == -1) { |
| nn_closefd (s); |
| return -ENODEV; |
| } |
| |
| /* Interface name resolution succeeded. Return the address to the user. */ |
| /* TODO: What about IPv6 addresses? */ |
| nn_assert (req.ifr_addr.sa_family == AF_INET); |
| if (result) |
| memcpy (result, (struct sockaddr_in*) &req.ifr_addr, |
| sizeof (struct sockaddr_in)); |
| if (resultlen) |
| *resultlen = sizeof (struct sockaddr_in); |
| nn_closefd (s); |
| return 0; |
| } |
| |
| #endif |
| |
| #if defined NN_USE_LITERAL_IFADDR |
| |
| /* The last resort case. If we haven't found any mechanism for turning |
| NIC names into addresses, we'll try to resolve the string as an address |
| literal. */ |
| int nn_iface_resolve (const char *addr, size_t addrlen, int ipv4only, |
| struct sockaddr_storage *result, size_t *resultlen) |
| { |
| int rc; |
| |
| /* Asterisk is a special name meaning "all interfaces". */ |
| if (addrlen == 1 && addr [0] == '*') { |
| nn_iface_any (ipv4only, result, resultlen); |
| return 0; |
| } |
| |
| /* On Windows there are no sane network interface names. We'll treat the |
| name as a IP address literal. */ |
| rc = nn_literal_resolve (addr, addrlen, ipv4only, result, resultlen); |
| if (rc == -EINVAL) |
| return -ENODEV; |
| errnum_assert (rc == 0, -rc); |
| return 0; |
| } |
| |
| #endif |
| |
| static void nn_iface_any (int ipv4only, struct sockaddr_storage *result, |
| size_t *resultlen) |
| { |
| if (ipv4only) { |
| if (result) { |
| result->ss_family = AF_INET; |
| ((struct sockaddr_in*) result)->sin_addr.s_addr = |
| htonl (INADDR_ANY); |
| } |
| if (resultlen) |
| *resultlen = sizeof (struct sockaddr_in); |
| } |
| else { |
| if (result) { |
| result->ss_family = AF_INET6; |
| memcpy (&((struct sockaddr_in6*) result)->sin6_addr, |
| &in6addr_any, sizeof (in6addr_any)); |
| } |
| if (resultlen) |
| *resultlen = sizeof (struct sockaddr_in6); |
| } |
| } |
| |
