mirror of
https://sourceware.org/git/glibc.git
synced 2025-07-28 00:21:52 +03:00
2.5-18.1
This commit is contained in:
@ -1,5 +1,5 @@
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/* Determine protocol families for which interfaces exist. Linux version.
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Copyright (C) 2003 Free Software Foundation, Inc.
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Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -17,9 +17,11 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <stddef.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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@ -29,16 +31,30 @@
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include "kernel-features.h"
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#include <not-cancel.h>
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#include <kernel-features.h>
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#ifndef IFA_F_TEMPORARY
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# define IFA_F_TEMPORARY IFA_F_SECONDARY
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#endif
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#ifndef IFA_F_HOMEADDRESS
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# define IFA_F_HOMEADDRESS 0
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#endif
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static int
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make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
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make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
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struct in6addrinfo **in6ai, size_t *in6ailen)
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{
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struct
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struct req
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{
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struct nlmsghdr nlh;
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struct rtgenmsg g;
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/* struct rtgenmsg consists of a single byte. This means there
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are three bytes of padding included in the REQ definition.
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We make them explicit here. */
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char pad[3];
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} req;
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struct sockaddr_nl nladdr;
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@ -49,20 +65,50 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
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req.nlh.nlmsg_seq = time (NULL);
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req.g.rtgen_family = AF_UNSPEC;
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assert (sizeof (req) - offsetof (struct req, pad) == 3);
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memset (req.pad, '\0', sizeof (req.pad));
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memset (&nladdr, '\0', sizeof (nladdr));
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nladdr.nl_family = AF_NETLINK;
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#ifdef PAGE_SIZE
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/* Help the compiler optimize out the malloc call if PAGE_SIZE
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is constant and smaller or equal to PTHREAD_STACK_MIN/4. */
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const size_t buf_size = PAGE_SIZE;
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#else
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const size_t buf_size = __getpagesize ();
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#endif
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bool use_malloc = false;
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char *buf;
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if (__libc_use_alloca (buf_size))
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buf = alloca (buf_size);
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else
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{
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buf = malloc (buf_size);
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if (buf != NULL)
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use_malloc = true;
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else
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goto out_fail;
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}
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struct iovec iov = { buf, buf_size };
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if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
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(struct sockaddr *) &nladdr,
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sizeof (nladdr))) < 0)
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return -1;
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goto out_fail;
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*seen_ipv4 = false;
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*seen_ipv6 = false;
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bool done = false;
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char buf[4096];
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struct iovec iov = { buf, sizeof (buf) };
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struct in6ailist
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{
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struct in6addrinfo info;
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struct in6ailist *next;
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} *in6ailist = NULL;
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size_t in6ailistlen = 0;
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do
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{
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@ -76,10 +122,10 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
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ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
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if (read_len < 0)
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return -1;
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goto out_fail;
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if (msg.msg_flags & MSG_TRUNC)
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return -1;
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goto out_fail;
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struct nlmsghdr *nlmh;
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for (nlmh = (struct nlmsghdr *) buf;
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@ -101,6 +147,47 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
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break;
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case AF_INET6:
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*seen_ipv6 = true;
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if (ifam->ifa_flags & (IFA_F_DEPRECATED
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| IFA_F_TEMPORARY
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| IFA_F_HOMEADDRESS))
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{
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struct rtattr *rta = IFA_RTA (ifam);
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size_t len = (nlmh->nlmsg_len
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- NLMSG_LENGTH (sizeof (*ifam)));
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void *local = NULL;
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void *address = NULL;
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while (RTA_OK (rta, len))
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{
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switch (rta->rta_type)
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{
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case IFA_LOCAL:
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local = RTA_DATA (rta);
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break;
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case IFA_ADDRESS:
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address = RTA_DATA (rta);
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break;
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}
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rta = RTA_NEXT (rta, len);
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}
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struct in6ailist *newp = alloca (sizeof (*newp));
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newp->info.flags = (((ifam->ifa_flags & IFA_F_DEPRECATED)
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? in6ai_deprecated : 0)
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| ((ifam->ifa_flags
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& IFA_F_TEMPORARY)
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? in6ai_temporary : 0)
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| ((ifam->ifa_flags
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& IFA_F_HOMEADDRESS)
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? in6ai_homeaddress : 0));
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memcpy (newp->info.addr, address ?: local,
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sizeof (newp->info.addr));
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newp->next = in6ailist;
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in6ailist = newp;
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++in6ailistlen;
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}
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break;
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default:
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/* Ignore. */
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@ -110,14 +197,36 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
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else if (nlmh->nlmsg_type == NLMSG_DONE)
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/* We found the end, leave the loop. */
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done = true;
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else ;
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}
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}
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while (! done);
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__close (fd);
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close_not_cancel_no_status (fd);
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if (in6ailist != NULL)
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{
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*in6ai = malloc (in6ailistlen * sizeof (**in6ai));
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if (*in6ai == NULL)
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goto out_fail;
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*in6ailen = in6ailistlen;
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do
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{
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(*in6ai)[--in6ailistlen] = in6ailist->info;
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in6ailist = in6ailist->next;
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}
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while (in6ailist != NULL);
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}
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if (use_malloc)
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free (buf);
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return 0;
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out_fail:
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if (use_malloc)
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free (buf);
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return -1;
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}
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@ -133,8 +242,12 @@ extern int __no_netlink_support attribute_hidden;
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void
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attribute_hidden
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__check_pf (bool *seen_ipv4, bool *seen_ipv6)
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__check_pf (bool *seen_ipv4, bool *seen_ipv6,
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struct in6addrinfo **in6ai, size_t *in6ailen)
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{
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*in6ai = NULL;
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*in6ailen = 0;
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if (! __no_netlink_support)
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{
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int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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@ -148,7 +261,8 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6)
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if (fd >= 0
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&& __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
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&& __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) == 0
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&& make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6) == 0)
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&& make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6,
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in6ai, in6ailen) == 0)
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/* It worked. */
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return;
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@ -178,9 +292,6 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6)
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return;
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}
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*seen_ipv4 = false;
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*seen_ipv6 = false;
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struct ifaddrs *runp;
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for (runp = ifa; runp != NULL; runp = runp->ifa_next)
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if (runp->ifa_addr->sa_family == PF_INET)
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