--- /dev/null
+/* Determine protocol families for which interfaces exist. ARM Linux version.
+ Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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 the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <assert.h>
+#include <errno.h>
+#include <ifaddrs.h>
+#include <netdb.h>
+#include <stddef.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/socket.h>
+
+#include <asm/types.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <not-cancel.h>
+#include <kernel-features.h>
+
+
+#ifndef IFA_F_TEMPORARY
+# define IFA_F_TEMPORARY IFA_F_SECONDARY
+#endif
+#ifndef IFA_F_HOMEADDRESS
+# define IFA_F_HOMEADDRESS 0
+#endif
+
+
+static int
+make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
+ struct in6addrinfo **in6ai, size_t *in6ailen)
+{
+ struct req
+ {
+ struct nlmsghdr nlh;
+ struct rtgenmsg g;
+ } req;
+ struct sockaddr_nl nladdr;
+
+ /* struct rtgenmsg consists of a single byte but the ARM ABI rounds
+ it up to a word. Clear the padding explicitly here. */
+ assert (sizeof (req.g) == 4);
+ memset (&req.g, '\0', sizeof (req.g));
+
+ req.nlh.nlmsg_len = sizeof (req);
+ req.nlh.nlmsg_type = RTM_GETADDR;
+ req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+ req.nlh.nlmsg_pid = 0;
+ req.nlh.nlmsg_seq = time (NULL);
+ req.g.rtgen_family = AF_UNSPEC;
+
+ memset (&nladdr, '\0', sizeof (nladdr));
+ nladdr.nl_family = AF_NETLINK;
+
+ if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
+ (struct sockaddr *) &nladdr,
+ sizeof (nladdr))) < 0)
+ return -1;
+
+ *seen_ipv4 = false;
+ *seen_ipv6 = false;
+
+ bool done = false;
+ char buf[4096];
+ struct iovec iov = { buf, sizeof (buf) };
+ struct in6ailist
+ {
+ struct in6addrinfo info;
+ struct in6ailist *next;
+ } *in6ailist = NULL;
+ size_t in6ailistlen = 0;
+
+ do
+ {
+ struct msghdr msg =
+ {
+ (void *) &nladdr, sizeof (nladdr),
+ &iov, 1,
+ NULL, 0,
+ 0
+ };
+
+ ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
+ if (read_len < 0)
+ return -1;
+
+ if (msg.msg_flags & MSG_TRUNC)
+ return -1;
+
+ struct nlmsghdr *nlmh;
+ for (nlmh = (struct nlmsghdr *) buf;
+ NLMSG_OK (nlmh, (size_t) read_len);
+ nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
+ {
+ if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
+ || nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
+ continue;
+
+ if (nlmh->nlmsg_type == RTM_NEWADDR)
+ {
+ struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlmh);
+
+ switch (ifam->ifa_family)
+ {
+ case AF_INET:
+ *seen_ipv4 = true;
+ break;
+ case AF_INET6:
+ *seen_ipv6 = true;
+
+ if (ifam->ifa_flags & (IFA_F_DEPRECATED
+ | IFA_F_TEMPORARY
+ | IFA_F_HOMEADDRESS))
+ {
+ struct rtattr *rta = IFA_RTA (ifam);
+ size_t len = (nlmh->nlmsg_len
+ - NLMSG_LENGTH (sizeof (*ifam)));
+ void *local = NULL;
+ void *address = NULL;
+ while (RTA_OK (rta, len))
+ {
+ switch (rta->rta_type)
+ {
+ case IFA_LOCAL:
+ local = RTA_DATA (rta);
+ break;
+
+ case IFA_ADDRESS:
+ address = RTA_DATA (rta);
+ break;
+ }
+
+ rta = RTA_NEXT (rta, len);
+ }
+
+ struct in6ailist *newp = alloca (sizeof (*newp));
+ newp->info.flags = (((ifam->ifa_flags & IFA_F_DEPRECATED)
+ ? in6ai_deprecated : 0)
+ | ((ifam->ifa_flags
+ & IFA_F_TEMPORARY)
+ ? in6ai_temporary : 0)
+ | ((ifam->ifa_flags
+ & IFA_F_HOMEADDRESS)
+ ? in6ai_homeaddress : 0));
+ memcpy (newp->info.addr, address ?: local,
+ sizeof (newp->info.addr));
+ newp->next = in6ailist;
+ in6ailist = newp;
+ ++in6ailistlen;
+ }
+ break;
+ default:
+ /* Ignore. */
+ break;
+ }
+ }
+ else if (nlmh->nlmsg_type == NLMSG_DONE)
+ /* We found the end, leave the loop. */
+ done = true;
+ }
+ }
+ while (! done);
+
+ close_not_cancel_no_status (fd);
+
+ if (in6ailist != NULL)
+ {
+ *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
+ if (*in6ai == NULL)
+ return -1;
+
+ *in6ailen = in6ailistlen;
+
+ do
+ {
+ (*in6ai)[--in6ailistlen] = in6ailist->info;
+ in6ailist = in6ailist->next;
+ }
+ while (in6ailist != NULL);
+ }
+
+ return 0;
+}
+
+
+/* We don't know if we have NETLINK support compiled in in our
+ Kernel. */
+#if __ASSUME_NETLINK_SUPPORT == 0
+/* Define in ifaddrs.h. */
+extern int __no_netlink_support attribute_hidden;
+#else
+# define __no_netlink_support 0
+#endif
+
+
+void
+attribute_hidden
+__check_pf (bool *seen_ipv4, bool *seen_ipv6,
+ struct in6addrinfo **in6ai, size_t *in6ailen)
+{
+ *in6ai = NULL;
+ *in6ailen = 0;
+
+ if (! __no_netlink_support)
+ {
+ int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+
+ struct sockaddr_nl nladdr;
+ memset (&nladdr, '\0', sizeof (nladdr));
+ nladdr.nl_family = AF_NETLINK;
+
+ socklen_t addr_len = sizeof (nladdr);
+
+ if (fd >= 0
+ && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
+ && __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) == 0
+ && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6,
+ in6ai, in6ailen) == 0)
+ /* It worked. */
+ return;
+
+ if (fd >= 0)
+ __close (fd);
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+ /* Remember that there is no netlink support. */
+ __no_netlink_support = 1;
+#else
+ /* We cannot determine what interfaces are available. Be
+ pessimistic. */
+ *seen_ipv4 = true;
+ *seen_ipv6 = true;
+#endif
+ }
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+ /* No netlink. Get the interface list via getifaddrs. */
+ struct ifaddrs *ifa = NULL;
+ if (getifaddrs (&ifa) != 0)
+ {
+ /* We cannot determine what interfaces are available. Be
+ pessimistic. */
+ *seen_ipv4 = true;
+ *seen_ipv6 = true;
+ return;
+ }
+
+ struct ifaddrs *runp;
+ for (runp = ifa; runp != NULL; runp = runp->ifa_next)
+ if (runp->ifa_addr->sa_family == PF_INET)
+ *seen_ipv4 = true;
+ else if (runp->ifa_addr->sa_family == PF_INET6)
+ *seen_ipv6 = true;
+
+ (void) freeifaddrs (ifa);
+#endif
+}
projects / thirdparty / glibc.git / commitdiff
