diff options
Diffstat (limited to 'libc/sysdeps/posix/getaddrinfo.c')
| -rw-r--r-- | libc/sysdeps/posix/getaddrinfo.c | 82 |
1 files changed, 77 insertions, 5 deletions
diff --git a/libc/sysdeps/posix/getaddrinfo.c b/libc/sysdeps/posix/getaddrinfo.c index 298755f8e..adb3c4f96 100644 --- a/libc/sysdeps/posix/getaddrinfo.c +++ b/libc/sysdeps/posix/getaddrinfo.c @@ -61,6 +61,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include <nscd/nscd-client.h> #include <nscd/nscd_proto.h> +#ifdef HAVE_NETLINK_ROUTE +# include <kernel-features.h> +#endif + #ifdef HAVE_LIBIDN extern int __idna_to_ascii_lz (const char *input, char **output, int flags); extern int __idna_to_unicode_lzlz (const char *input, char **output, @@ -1095,6 +1099,10 @@ static const struct prefixentry default_labels[] = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } }, 7, 6 }, { { .in6_u + = { .u6_addr8 = { 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } }, + 32, 7 }, + { { .in6_u = { .u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } }, 0, 1 } @@ -1728,6 +1736,16 @@ gaiconf_reload (void) } +#if HAVE_NETLINK_ROUTE +# if __ASSUME_NETLINK_SUPPORT == 0 +/* Defined in ifaddrs.c. */ +extern int __no_netlink_support attribute_hidden; +# else +# define __no_netlink_support 0 +# endif +#endif + + int getaddrinfo (const char *name, const char *service, const struct addrinfo *hints, struct addrinfo **pai) @@ -1763,20 +1781,74 @@ getaddrinfo (const char *name, const char *service, return EAI_BADFLAGS; struct in6addrinfo *in6ai = NULL; - size_t in6ailen; + size_t in6ailen = 0; bool seen_ipv4 = false; bool seen_ipv6 = false; +#ifdef HAVE_NETLINK_ROUTE + int sockfd = -1; + pid_t nl_pid; +#endif /* We might need information about what kind of interfaces are available. But even if AI_ADDRCONFIG is not used, if the user requested IPv6 addresses we have to know whether an address is deprecated or temporary. */ if ((hints->ai_flags & AI_ADDRCONFIG) || hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET6) - /* Determine whether we have IPv4 or IPv6 interfaces or both. We - cannot cache the results since new interfaces could be added at - any time. */ - __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen); + { + /* Determine whether we have IPv4 or IPv6 interfaces or both. We + cannot cache the results since new interfaces could be added at + any time. */ + __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen); +#ifdef HAVE_NETLINK_ROUTE + if (! __no_netlink_support) + { + sockfd = __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 (sockfd >= 0 + && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0 + && __getsockname (sockfd, (struct sockaddr *) &nladdr, + &addr_len) == 0 + && make_request (sockfd, nladdr.nl_pid, &seen_ipv4, &seen_ipv6, + in6ai, in6ailen) == 0) + { + /* It worked. */ + nl_pid = nladdr.nl_pid; + goto got_netlink_socket; + } + + if (sockfd >= 0) + close_not_cancel_no_status (sockfd); + +#if __ASSUME_NETLINK_SUPPORT == 0 + /* Remember that there is no netlink support. */ + if (errno != EMFILE && errno != ENFILE) + __no_netlink_support = 1; +#else + else + { + if (errno != EMFILE && errno != ENFILE) + sockfd = -2; + + /* We cannot determine what interfaces are available. Be + pessimistic. */ + seen_ipv4 = true; + seen_ipv6 = true; + return; + } +#endif + } +#endif + } + +#ifdef HAVE_NETLINK_ROUTE + got_netlink_socket: +#endif if (hints->ai_flags & AI_ADDRCONFIG) { /* Now make a decision on what we return, if anything. */ |