diff options
Diffstat (limited to 'libc/inet/getaddrinfo.c')
| -rw-r--r-- | libc/inet/getaddrinfo.c | 92 |
1 files changed, 74 insertions, 18 deletions
diff --git a/libc/inet/getaddrinfo.c b/libc/inet/getaddrinfo.c index 8b735f29b..8baa6815e 100644 --- a/libc/inet/getaddrinfo.c +++ b/libc/inet/getaddrinfo.c @@ -1,6 +1,8 @@ /* * Copyright 1996 by Craig Metz * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> + * Portions from the GNU C library, + * Copyright (C) 2003, 2006 Free Software Foundation, Inc. * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ @@ -157,29 +159,85 @@ static const struct addrinfo default_hints = { 0, PF_UNSPEC, 0, 0, 0, NULL, NULL, NULL }; #endif +#define SEEN_IPV4 1 +#define SEEN_IPV6 2 + +static unsigned __check_pf (void) +{ + unsigned seen = 0; +#if defined __UCLIBC_SUPPORT_AI_ADDRCONFIG__ + { + /* Get the interface list via getifaddrs. */ + struct ifaddrs *ifa = NULL; + struct ifaddrs *runp; + if (getifaddrs (&ifa) != 0) + { + /* We cannot determine what interfaces are available. Be + optimistic. */ +#if defined __UCLIBC_HAS_IPV4__ + seen |= SEEN_IPV4; +#endif /* __UCLIBC_HAS_IPV4__ */ +#if defined __UCLIBC_HAS_IPV6__ + seen |= SEEN_IPV6; +#endif /* __UCLIBC_HAS_IPV6__ */ + return seen; + } + + for (runp = ifa; runp != NULL; runp = runp->ifa_next) +#if defined __UCLIBC_HAS_IPV4__ + if (runp->ifa_addr->sa_family == PF_INET) + seen |= SEEN_IPV4; +#endif /* __UCLIBC_HAS_IPV4__ */ +#if defined __UCLIBC_HAS_IPV4__ && defined __UCLIBC_HAS_IPV6__ + else /* can't be both at once */ +#endif /* __UCLIBC_HAS_IPV4__ && defined __UCLIBC_HAS_IPV6__ */ +#if defined __UCLIBC_HAS_IPV6__ + if (runp->ifa_addr->sa_family == PF_INET6) + seen |= SEEN_IPV6; +#endif /* __UCLIBC_HAS_IPV6__ */ + + (void) freeifaddrs (ifa); + } +#else + /* AI_ADDRCONFIG is disabled, assume both ipv4 and ipv6 available. */ +#if defined __UCLIBC_HAS_IPV4__ + seen |= SEEN_IPV4; +#endif /* __UCLIBC_HAS_IPV4__ */ +#if defined __UCLIBC_HAS_IPV6__ + seen |= SEEN_IPV6; +#endif /* __UCLIBC_HAS_IPV6__ */ + +#endif /* __UCLIBC_SUPPORT_AI_ADDRCONFIG__ */ + return seen; +} + static int addrconfig (sa_family_t af) { int s; int ret; int saved_errno = errno; - bool seen_ipv4; - bool seen_ipv6; + unsigned seen; - __check_pf(&seen_ipv4, &seen_ipv6); + seen = __check_pf(); +#if defined __UCLIBC_HAS_IPV4__ if (af == AF_INET) - ret = (int)seen_ipv4; - else if (af == AF_INET6) - ret = (int)seen_ipv6; + ret = seen & SEEN_IPV4; + else +#endif +#if defined __UCLIBC_HAS_IPV6__ + if (af == AF_INET6) + ret = seen & SEEN_IPV6; else +#endif { s = socket(af, SOCK_DGRAM, 0); - if (s < 0) - ret = (errno == EMFILE) ? 1 : 0; + ret = 1; /* Assume PF_UNIX. */ + if (s < 0) { + if (errno != EMFILE) + ret = 0; + } else - { close(s); - ret = 1; - } } __set_errno (saved_errno); return ret; @@ -384,9 +442,7 @@ gaih_inet (const char *name, const struct gaih_service *service, int rc; int v4mapped = (req->ai_family == PF_UNSPEC || req->ai_family == PF_INET6) && (req->ai_flags & AI_V4MAPPED); - bool seen_ipv4; - bool seen_ipv6; - __check_pf(&seen_ipv4, &seen_ipv6); + unsigned seen = __check_pf(); if (req->ai_protocol || req->ai_socktype) { @@ -574,7 +630,7 @@ gaih_inet (const char *name, const struct gaih_service *service, #if defined __UCLIBC_HAS_IPV6__ if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) - if (!(req->ai_flags & AI_ADDRCONFIG) || seen_ipv6) + if (!(req->ai_flags & AI_ADDRCONFIG) || (seen & SEEN_IPV6)) gethosts (AF_INET6, struct in6_addr); #endif no_inet6_data = no_data; @@ -582,7 +638,7 @@ gaih_inet (const char *name, const struct gaih_service *service, if (req->ai_family == AF_INET || (!v4mapped && req->ai_family == AF_UNSPEC) || (v4mapped && (no_inet6_data != 0 || (req->ai_flags & AI_ALL)))) - if (!(req->ai_flags & AI_ADDRCONFIG) || seen_ipv4) + if (!(req->ai_flags & AI_ADDRCONFIG) || (seen & SEEN_IPV4)) gethosts (AF_INET, struct in_addr); if (no_data != 0 && no_inet6_data != 0) @@ -715,10 +771,10 @@ gaih_inet (const char *name, const struct gaih_service *service, for (st2 = st; st2 != NULL; st2 = st2->next) { if (req->ai_flags & AI_ADDRCONFIG) { - if (family == AF_INET && !seen_ipv4) + if (family == AF_INET && !(seen & SEEN_IPV4)) break; #if defined __UCLIBC_HAS_IPV6__ - else if (family == AF_INET6 && !seen_ipv6) + else if (family == AF_INET6 && !(seen & SEEN_IPV6)) break; #endif } |