diff options
Diffstat (limited to 'sysdeps/posix/getaddrinfo.c')
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 2598 |
1 files changed, 0 insertions, 2598 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c deleted file mode 100644 index a8bdd9a182..0000000000 --- a/sysdeps/posix/getaddrinfo.c +++ /dev/null @@ -1,2598 +0,0 @@ -/* Host and service name lookups using Name Service Switch modules. - Copyright (C) 1996-2017 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, see - <http://www.gnu.org/licenses/>. */ - -/* The Inner Net License, Version 2.00 - - The author(s) grant permission for redistribution and use in source and -binary forms, with or without modification, of the software and documentation -provided that the following conditions are met: - -0. If you receive a version of the software that is specifically labelled - as not being for redistribution (check the version message and/or README), - you are not permitted to redistribute that version of the software in any - way or form. -1. All terms of the all other applicable copyrights and licenses must be - followed. -2. Redistributions of source code must retain the authors' copyright - notice(s), this list of conditions, and the following disclaimer. -3. Redistributions in binary form must reproduce the authors' copyright - notice(s), this list of conditions, and the following disclaimer in the - documentation and/or other materials provided with the distribution. -4. [The copyright holder has authorized the removal of this clause.] -5. Neither the name(s) of the author(s) nor the names of its contributors - may be used to endorse or promote products derived from this software - without specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY -EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON -ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - If these license terms cause you a real problem, contact the author. */ - -/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */ - -#include <assert.h> -#include <ctype.h> -#include <errno.h> -#include <ifaddrs.h> -#include <netdb.h> -#include <nss.h> -#include <resolv/resolv-internal.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdio_ext.h> -#include <stdlib.h> -#include <string.h> -#include <stdint.h> -#include <arpa/inet.h> -#include <net/if.h> -#include <netinet/in.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/un.h> -#include <sys/utsname.h> -#include <unistd.h> -#include <nsswitch.h> -#include <libc-lock.h> -#include <not-cancel.h> -#include <nscd/nscd-client.h> -#include <nscd/nscd_proto.h> -#include <resolv/res_hconf.h> -#include <scratch_buffer.h> -#include <inet/net-internal.h> - -#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, - int flags); -# include <libidn/idna.h> -#endif - -struct gaih_service - { - const char *name; - int num; - }; - -struct gaih_servtuple - { - struct gaih_servtuple *next; - int socktype; - int protocol; - int port; - }; - -static const struct gaih_servtuple nullserv; - - -struct gaih_typeproto - { - int socktype; - int protocol; - uint8_t protoflag; - bool defaultflag; - char name[8]; - }; - -/* Values for `protoflag'. */ -#define GAI_PROTO_NOSERVICE 1 -#define GAI_PROTO_PROTOANY 2 - -static const struct gaih_typeproto gaih_inet_typeproto[] = -{ - { 0, 0, 0, false, "" }, - { SOCK_STREAM, IPPROTO_TCP, 0, true, "tcp" }, - { SOCK_DGRAM, IPPROTO_UDP, 0, true, "udp" }, -#if defined SOCK_DCCP && defined IPPROTO_DCCP - { SOCK_DCCP, IPPROTO_DCCP, 0, false, "dccp" }, -#endif -#ifdef IPPROTO_UDPLITE - { SOCK_DGRAM, IPPROTO_UDPLITE, 0, false, "udplite" }, -#endif -#ifdef IPPROTO_SCTP - { SOCK_STREAM, IPPROTO_SCTP, 0, false, "sctp" }, - { SOCK_SEQPACKET, IPPROTO_SCTP, 0, false, "sctp" }, -#endif - { SOCK_RAW, 0, GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE, true, "raw" }, - { 0, 0, 0, false, "" } -}; - -static const struct addrinfo default_hints = - { - .ai_flags = AI_DEFAULT, - .ai_family = PF_UNSPEC, - .ai_socktype = 0, - .ai_protocol = 0, - .ai_addrlen = 0, - .ai_addr = NULL, - .ai_canonname = NULL, - .ai_next = NULL - }; - - -static int -gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, - const struct addrinfo *req, struct gaih_servtuple *st, - struct scratch_buffer *tmpbuf) -{ - struct servent *s; - struct servent ts; - int r; - - do - { - r = __getservbyname_r (servicename, tp->name, &ts, - tmpbuf->data, tmpbuf->length, &s); - if (r != 0 || s == NULL) - { - if (r == ERANGE) - { - if (!scratch_buffer_grow (tmpbuf)) - return -EAI_MEMORY; - } - else - return -EAI_SERVICE; - } - } - while (r); - - st->next = NULL; - st->socktype = tp->socktype; - st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) - ? req->ai_protocol : tp->protocol); - st->port = s->s_port; - - return 0; -} - -/* Convert struct hostent to a list of struct gaih_addrtuple objects. - h_name is not copied, and the struct hostent object must not be - deallocated prematurely. *RESULT must be NULL or a pointer to an - object allocated using malloc, which is freed. */ -static bool -convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, - int family, - struct hostent *h, - struct gaih_addrtuple **result) -{ - free (*result); - *result = NULL; - - /* Count the number of addresses in h->h_addr_list. */ - size_t count = 0; - for (char **p = h->h_addr_list; *p != NULL; ++p) - ++count; - - /* Report no data if no addresses are available, or if the incoming - address size is larger than what we can store. */ - if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr)) - return true; - - struct gaih_addrtuple *array = calloc (count, sizeof (*array)); - if (array == NULL) - return false; - - for (size_t i = 0; i < count; ++i) - { - if (family == AF_INET && req->ai_family == AF_INET6) - { - /* Perform address mapping. */ - array[i].family = AF_INET6; - memcpy(array[i].addr + 3, h->h_addr_list[i], sizeof (uint32_t)); - array[i].addr[2] = htonl (0xffff); - } - else - { - array[i].family = family; - memcpy (array[i].addr, h->h_addr_list[i], h->h_length); - } - array[i].next = array + i + 1; - } - array[0].name = h->h_name; - array[count - 1].next = NULL; - - *result = array; - return true; -} - -#define gethosts(_family, _type) \ - { \ - int herrno; \ - struct hostent th; \ - struct hostent *h; \ - char *localcanon = NULL; \ - no_data = 0; \ - while (1) { \ - rc = 0; \ - status = DL_CALL_FCT (fct, (name, _family, &th, \ - tmpbuf->data, tmpbuf->length, \ - &rc, &herrno, NULL, &localcanon)); \ - if (rc != ERANGE || herrno != NETDB_INTERNAL) \ - break; \ - if (!scratch_buffer_grow (tmpbuf)) \ - { \ - result = -EAI_MEMORY; \ - goto free_and_return; \ - } \ - } \ - if (status == NSS_STATUS_SUCCESS && rc == 0) \ - h = &th; \ - else \ - h = NULL; \ - if (rc != 0) \ - { \ - if (herrno == NETDB_INTERNAL) \ - { \ - __set_h_errno (herrno); \ - _res.options |= old_res_options & DEPRECATED_RES_USE_INET6; \ - result = -EAI_SYSTEM; \ - goto free_and_return; \ - } \ - if (herrno == TRY_AGAIN) \ - no_data = EAI_AGAIN; \ - else \ - no_data = herrno == NO_DATA; \ - } \ - else if (h != NULL) \ - { \ - if (!convert_hostent_to_gaih_addrtuple (req, _family,h, &addrmem)) \ - { \ - _res.options |= old_res_options & DEPRECATED_RES_USE_INET6; \ - result = -EAI_SYSTEM; \ - goto free_and_return; \ - } \ - *pat = addrmem; \ - \ - if (localcanon != NULL && canon == NULL) \ - { \ - canonbuf = __strdup (localcanon); \ - if (canonbuf == NULL) \ - { \ - result = -EAI_SYSTEM; \ - goto free_and_return; \ - } \ - canon = canonbuf; \ - } \ - if (_family == AF_INET6 && *pat != NULL) \ - got_ipv6 = true; \ - } \ - } - - -typedef enum nss_status (*nss_gethostbyname4_r) - (const char *name, struct gaih_addrtuple **pat, - char *buffer, size_t buflen, int *errnop, - int *h_errnop, int32_t *ttlp); -typedef enum nss_status (*nss_gethostbyname3_r) - (const char *name, int af, struct hostent *host, - char *buffer, size_t buflen, int *errnop, - int *h_errnop, int32_t *ttlp, char **canonp); -typedef enum nss_status (*nss_getcanonname_r) - (const char *name, char *buffer, size_t buflen, char **result, - int *errnop, int *h_errnop); -extern service_user *__nss_hosts_database attribute_hidden; - -/* This function is called if a canonical name is requested, but if - the service function did not provide it. It tries to obtain the - name using getcanonname_r from the same service NIP. If the name - cannot be canonicalized, return a copy of NAME. Return NULL on - memory allocation failure. The returned string is allocated on the - heap; the caller has to free it. */ -static char * -getcanonname (service_user *nip, struct gaih_addrtuple *at, const char *name) -{ - nss_getcanonname_r cfct = __nss_lookup_function (nip, "getcanonname_r"); - char *s = (char *) name; - if (cfct != NULL) - { - char buf[256]; - int herrno; - int rc; - if (DL_CALL_FCT (cfct, (at->name ?: name, buf, sizeof (buf), - &s, &rc, &herrno)) != NSS_STATUS_SUCCESS) - /* If the canonical name cannot be determined, use the passed - string. */ - s = (char *) name; - } - return __strdup (name); -} - -static int -gaih_inet (const char *name, const struct gaih_service *service, - const struct addrinfo *req, struct addrinfo **pai, - unsigned int *naddrs, struct scratch_buffer *tmpbuf) -{ - const struct gaih_typeproto *tp = gaih_inet_typeproto; - struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv; - struct gaih_addrtuple *at = NULL; - int rc; - bool got_ipv6 = false; - const char *canon = NULL; - const char *orig_name = name; - - /* Reserve stack memory for the scratch buffer in the getaddrinfo - function. */ - size_t alloca_used = sizeof (struct scratch_buffer); - - if (req->ai_protocol || req->ai_socktype) - { - ++tp; - - while (tp->name[0] - && ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype) - || (req->ai_protocol != 0 - && !(tp->protoflag & GAI_PROTO_PROTOANY) - && req->ai_protocol != tp->protocol))) - ++tp; - - if (! tp->name[0]) - { - if (req->ai_socktype) - return -EAI_SOCKTYPE; - else - return -EAI_SERVICE; - } - } - - int port = 0; - if (service != NULL) - { - if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) - return -EAI_SERVICE; - - if (service->num < 0) - { - if (tp->name[0]) - { - st = (struct gaih_servtuple *) - alloca_account (sizeof (struct gaih_servtuple), alloca_used); - - if ((rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf))) - return rc; - } - else - { - struct gaih_servtuple **pst = &st; - for (tp++; tp->name[0]; tp++) - { - struct gaih_servtuple *newp; - - if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) - continue; - - if (req->ai_socktype != 0 - && req->ai_socktype != tp->socktype) - continue; - if (req->ai_protocol != 0 - && !(tp->protoflag & GAI_PROTO_PROTOANY) - && req->ai_protocol != tp->protocol) - continue; - - newp = (struct gaih_servtuple *) - alloca_account (sizeof (struct gaih_servtuple), - alloca_used); - - if ((rc = gaih_inet_serv (service->name, - tp, req, newp, tmpbuf))) - { - if (rc) - continue; - return rc; - } - - *pst = newp; - pst = &(newp->next); - } - if (st == (struct gaih_servtuple *) &nullserv) - return -EAI_SERVICE; - } - } - else - { - port = htons (service->num); - goto got_port; - } - } - else - { - got_port: - - if (req->ai_socktype || req->ai_protocol) - { - st = alloca_account (sizeof (struct gaih_servtuple), alloca_used); - st->next = NULL; - st->socktype = tp->socktype; - st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) - ? req->ai_protocol : tp->protocol); - st->port = port; - } - else - { - /* Neither socket type nor protocol is set. Return all socket types - we know about. */ - struct gaih_servtuple **lastp = &st; - for (++tp; tp->name[0]; ++tp) - if (tp->defaultflag) - { - struct gaih_servtuple *newp; - - newp = alloca_account (sizeof (struct gaih_servtuple), - alloca_used); - newp->next = NULL; - newp->socktype = tp->socktype; - newp->protocol = tp->protocol; - newp->port = port; - - *lastp = newp; - lastp = &newp->next; - } - } - } - - bool malloc_name = false; - struct gaih_addrtuple *addrmem = NULL; - char *canonbuf = NULL; - int result = 0; - - if (name != NULL) - { - at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); - at->family = AF_UNSPEC; - at->scopeid = 0; - at->next = NULL; - -#ifdef HAVE_LIBIDN - if (req->ai_flags & AI_IDN) - { - int idn_flags = 0; - if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) - idn_flags |= IDNA_ALLOW_UNASSIGNED; - if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) - idn_flags |= IDNA_USE_STD3_ASCII_RULES; - - char *p = NULL; - rc = __idna_to_ascii_lz (name, &p, idn_flags); - if (rc != IDNA_SUCCESS) - { - /* No need to jump to free_and_return here. */ - if (rc == IDNA_MALLOC_ERROR) - return -EAI_MEMORY; - if (rc == IDNA_DLOPEN_ERROR) - return -EAI_SYSTEM; - return -EAI_IDN_ENCODE; - } - /* In case the output string is the same as the input string - no new string has been allocated. */ - if (p != name) - { - name = p; - malloc_name = true; - } - } -#endif - - if (__inet_aton (name, (struct in_addr *) at->addr) != 0) - { - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) - at->family = AF_INET; - else if (req->ai_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED)) - { - at->addr[3] = at->addr[0]; - at->addr[2] = htonl (0xffff); - at->addr[1] = 0; - at->addr[0] = 0; - at->family = AF_INET6; - } - else - { - result = -EAI_ADDRFAMILY; - goto free_and_return; - } - - if (req->ai_flags & AI_CANONNAME) - canon = name; - } - else if (at->family == AF_UNSPEC) - { - char *scope_delim = strchr (name, SCOPE_DELIMITER); - int e; - - { - bool malloc_namebuf = false; - char *namebuf = (char *) name; - - if (__glibc_unlikely (scope_delim != NULL)) - { - if (malloc_name) - *scope_delim = '\0'; - else - { - if (__libc_use_alloca (alloca_used - + scope_delim - name + 1)) - { - namebuf = alloca_account (scope_delim - name + 1, - alloca_used); - *((char *) __mempcpy (namebuf, name, - scope_delim - name)) = '\0'; - } - else - { - namebuf = __strndup (name, scope_delim - name); - if (namebuf == NULL) - { - assert (!malloc_name); - return -EAI_MEMORY; - } - malloc_namebuf = true; - } - } - } - - e = inet_pton (AF_INET6, namebuf, at->addr); - - if (malloc_namebuf) - free (namebuf); - else if (scope_delim != NULL && malloc_name) - /* Undo what we did above. */ - *scope_delim = SCOPE_DELIMITER; - } - if (e > 0) - { - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) - at->family = AF_INET6; - else if (req->ai_family == AF_INET - && IN6_IS_ADDR_V4MAPPED (at->addr)) - { - at->addr[0] = at->addr[3]; - at->family = AF_INET; - } - else - { - result = -EAI_ADDRFAMILY; - goto free_and_return; - } - - if (scope_delim != NULL - && __inet6_scopeid_pton ((struct in6_addr *) at->addr, - scope_delim + 1, - &at->scopeid) != 0) - { - result = -EAI_NONAME; - goto free_and_return; - } - - if (req->ai_flags & AI_CANONNAME) - canon = name; - } - } - - if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0) - { - struct gaih_addrtuple **pat = &at; - int no_data = 0; - int no_inet6_data = 0; - service_user *nip; - enum nss_status inet6_status = NSS_STATUS_UNAVAIL; - enum nss_status status = NSS_STATUS_UNAVAIL; - int no_more; - int old_res_options; - - /* If we do not have to look for IPv6 addresses or the canonical - name, use the simple, old functions, which do not support - IPv6 scope ids, nor retrieving the canonical name. */ - if (req->ai_family == AF_INET - && (req->ai_flags & AI_CANONNAME) == 0) - { - int rc; - struct hostent th; - struct hostent *h; - int herrno; - - while (1) - { - rc = __gethostbyname2_r (name, AF_INET, &th, - tmpbuf->data, tmpbuf->length, - &h, &herrno); - if (rc != ERANGE || herrno != NETDB_INTERNAL) - break; - if (!scratch_buffer_grow (tmpbuf)) - { - result = -EAI_MEMORY; - goto free_and_return; - } - } - - if (rc == 0) - { - if (h != NULL) - { - /* We found data, convert it. */ - if (!convert_hostent_to_gaih_addrtuple - (req, AF_INET, h, &addrmem)) - { - result = -EAI_MEMORY; - goto free_and_return; - } - *pat = addrmem; - } - } - else - { - if (herrno == NETDB_INTERNAL) - { - __set_h_errno (herrno); - result = -EAI_SYSTEM; - } - else if (herrno == TRY_AGAIN) - result = -EAI_AGAIN; - else - /* We made requests but they turned out no data. - The name is known, though. */ - result = -EAI_NODATA; - - goto free_and_return; - } - - goto process_list; - } - -#ifdef USE_NSCD - if (__nss_not_use_nscd_hosts > 0 - && ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY) - __nss_not_use_nscd_hosts = 0; - - if (!__nss_not_use_nscd_hosts - && !__nss_database_custom[NSS_DBSIDX_hosts]) - { - /* Try to use nscd. */ - struct nscd_ai_result *air = NULL; - int herrno; - int err = __nscd_getai (name, &air, &herrno); - if (air != NULL) - { - /* Transform into gaih_addrtuple list. */ - bool added_canon = (req->ai_flags & AI_CANONNAME) == 0; - char *addrs = air->addrs; - - addrmem = calloc (air->naddrs, sizeof (*addrmem)); - if (addrmem == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - - struct gaih_addrtuple *addrfree = addrmem; - for (int i = 0; i < air->naddrs; ++i) - { - socklen_t size = (air->family[i] == AF_INET - ? INADDRSZ : IN6ADDRSZ); - - if (!((air->family[i] == AF_INET - && req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED) != 0) - || req->ai_family == AF_UNSPEC - || air->family[i] == req->ai_family)) - { - /* Skip over non-matching result. */ - addrs += size; - continue; - } - - if (*pat == NULL) - { - *pat = addrfree++; - (*pat)->scopeid = 0; - } - uint32_t *pataddr = (*pat)->addr; - (*pat)->next = NULL; - if (added_canon || air->canon == NULL) - (*pat)->name = NULL; - else if (canonbuf == NULL) - { - canonbuf = __strdup (air->canon); - if (canonbuf == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - canon = (*pat)->name = canonbuf; - } - - if (air->family[i] == AF_INET - && req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED)) - { - (*pat)->family = AF_INET6; - pataddr[3] = *(uint32_t *) addrs; - pataddr[2] = htonl (0xffff); - pataddr[1] = 0; - pataddr[0] = 0; - pat = &((*pat)->next); - added_canon = true; - } - else if (req->ai_family == AF_UNSPEC - || air->family[i] == req->ai_family) - { - (*pat)->family = air->family[i]; - memcpy (pataddr, addrs, size); - pat = &((*pat)->next); - added_canon = true; - if (air->family[i] == AF_INET6) - got_ipv6 = true; - } - addrs += size; - } - - free (air); - - if (at->family == AF_UNSPEC) - { - result = -EAI_NONAME; - goto free_and_return; - } - - goto process_list; - } - else if (err == 0) - /* The database contains a negative entry. */ - goto free_and_return; - else if (__nss_not_use_nscd_hosts == 0) - { - if (herrno == NETDB_INTERNAL && errno == ENOMEM) - result = -EAI_MEMORY; - else if (herrno == TRY_AGAIN) - result = -EAI_AGAIN; - else - result = -EAI_SYSTEM; - - goto free_and_return; - } - } -#endif - - if (__nss_hosts_database == NULL) - no_more = __nss_database_lookup ("hosts", NULL, - "dns [!UNAVAIL=return] files", - &__nss_hosts_database); - else - no_more = 0; - nip = __nss_hosts_database; - - /* Initialize configurations. */ - _res_hconf_init (); - if (__res_maybe_init (&_res, 0) == -1) - no_more = 1; - - /* If we are looking for both IPv4 and IPv6 address we don't - want the lookup functions to automatically promote IPv4 - addresses to IPv6 addresses. Currently this is decided - by setting the RES_USE_INET6 bit in _res.options. */ - old_res_options = _res.options; - _res.options &= ~DEPRECATED_RES_USE_INET6; - - while (!no_more) - { - no_data = 0; - nss_gethostbyname4_r fct4 = NULL; - - /* gethostbyname4_r sends out parallel A and AAAA queries and - is thus only suitable for PF_UNSPEC. */ - if (req->ai_family == PF_UNSPEC) - fct4 = __nss_lookup_function (nip, "gethostbyname4_r"); - - if (fct4 != NULL) - { - int herrno; - - while (1) - { - rc = 0; - status = DL_CALL_FCT (fct4, (name, pat, - tmpbuf->data, tmpbuf->length, - &rc, &herrno, - NULL)); - if (status == NSS_STATUS_SUCCESS) - break; - if (status != NSS_STATUS_TRYAGAIN - || rc != ERANGE || herrno != NETDB_INTERNAL) - { - if (herrno == TRY_AGAIN) - no_data = EAI_AGAIN; - else - no_data = herrno == NO_DATA; - break; - } - - if (!scratch_buffer_grow (tmpbuf)) - { - _res.options - |= old_res_options & DEPRECATED_RES_USE_INET6; - result = -EAI_MEMORY; - goto free_and_return; - } - } - - if (status == NSS_STATUS_SUCCESS) - { - assert (!no_data); - no_data = 1; - - if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) - canon = (*pat)->name; - - while (*pat != NULL) - { - if ((*pat)->family == AF_INET - && req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED) != 0) - { - uint32_t *pataddr = (*pat)->addr; - (*pat)->family = AF_INET6; - pataddr[3] = pataddr[0]; - pataddr[2] = htonl (0xffff); - pataddr[1] = 0; - pataddr[0] = 0; - pat = &((*pat)->next); - no_data = 0; - } - else if (req->ai_family == AF_UNSPEC - || (*pat)->family == req->ai_family) - { - pat = &((*pat)->next); - - no_data = 0; - if (req->ai_family == AF_INET6) - got_ipv6 = true; - } - else - *pat = ((*pat)->next); - } - } - - no_inet6_data = no_data; - } - else - { - nss_gethostbyname3_r fct = NULL; - if (req->ai_flags & AI_CANONNAME) - /* No need to use this function if we do not look for - the canonical name. The function does not exist in - all NSS modules and therefore the lookup would - often fail. */ - fct = __nss_lookup_function (nip, "gethostbyname3_r"); - if (fct == NULL) - /* We are cheating here. The gethostbyname2_r - function does not have the same interface as - gethostbyname3_r but the extra arguments the - latter takes are added at the end. So the - gethostbyname2_r code will just ignore them. */ - fct = __nss_lookup_function (nip, "gethostbyname2_r"); - - if (fct != NULL) - { - if (req->ai_family == AF_INET6 - || req->ai_family == AF_UNSPEC) - { - gethosts (AF_INET6, struct in6_addr); - no_inet6_data = no_data; - inet6_status = status; - } - if (req->ai_family == AF_INET - || req->ai_family == AF_UNSPEC - || (req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED) - /* Avoid generating the mapped addresses if we - know we are not going to need them. */ - && ((req->ai_flags & AI_ALL) || !got_ipv6))) - { - gethosts (AF_INET, struct in_addr); - - if (req->ai_family == AF_INET) - { - no_inet6_data = no_data; - inet6_status = status; - } - } - - /* If we found one address for AF_INET or AF_INET6, - don't continue the search. */ - if (inet6_status == NSS_STATUS_SUCCESS - || status == NSS_STATUS_SUCCESS) - { - if ((req->ai_flags & AI_CANONNAME) != 0 - && canon == NULL) - { - canonbuf = getcanonname (nip, at, name); - if (canonbuf == NULL) - { - _res.options - |= old_res_options - & DEPRECATED_RES_USE_INET6; - result = -EAI_MEMORY; - goto free_and_return; - } - canon = canonbuf; - } - status = NSS_STATUS_SUCCESS; - } - else - { - /* We can have different states for AF_INET and - AF_INET6. Try to find a useful one for both. */ - if (inet6_status == NSS_STATUS_TRYAGAIN) - status = NSS_STATUS_TRYAGAIN; - else if (status == NSS_STATUS_UNAVAIL - && inet6_status != NSS_STATUS_UNAVAIL) - status = inet6_status; - } - } - else - { - status = NSS_STATUS_UNAVAIL; - /* Could not load any of the lookup functions. Indicate - an internal error if the failure was due to a system - error other than the file not being found. We use the - errno from the last failed callback. */ - if (errno != 0 && errno != ENOENT) - __set_h_errno (NETDB_INTERNAL); - } - } - - if (nss_next_action (nip, status) == NSS_ACTION_RETURN) - break; - - if (nip->next == NULL) - no_more = -1; - else - nip = nip->next; - } - - _res.options |= old_res_options & DEPRECATED_RES_USE_INET6; - - if (h_errno == NETDB_INTERNAL) - { - result = -EAI_SYSTEM; - goto free_and_return; - } - - if (no_data != 0 && no_inet6_data != 0) - { - /* If both requests timed out report this. */ - if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN) - result = -EAI_AGAIN; - else - /* We made requests but they turned out no data. The name - is known, though. */ - result = -EAI_NODATA; - - goto free_and_return; - } - } - - process_list: - if (at->family == AF_UNSPEC) - { - result = -EAI_NONAME; - goto free_and_return; - } - } - else - { - struct gaih_addrtuple *atr; - atr = at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); - memset (at, '\0', sizeof (struct gaih_addrtuple)); - - if (req->ai_family == AF_UNSPEC) - { - at->next = __alloca (sizeof (struct gaih_addrtuple)); - memset (at->next, '\0', sizeof (struct gaih_addrtuple)); - } - - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) - { - at->family = AF_INET6; - if ((req->ai_flags & AI_PASSIVE) == 0) - memcpy (at->addr, &in6addr_loopback, sizeof (struct in6_addr)); - atr = at->next; - } - - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) - { - atr->family = AF_INET; - if ((req->ai_flags & AI_PASSIVE) == 0) - atr->addr[0] = htonl (INADDR_LOOPBACK); - } - } - - { - struct gaih_servtuple *st2; - struct gaih_addrtuple *at2 = at; - size_t socklen; - sa_family_t family; - - /* - buffer is the size of an unformatted IPv6 address in printable format. - */ - while (at2 != NULL) - { - /* Only the first entry gets the canonical name. */ - if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0) - { - if (canon == NULL) - /* If the canonical name cannot be determined, use - the passed in string. */ - canon = orig_name; - -#ifdef HAVE_LIBIDN - if (req->ai_flags & AI_CANONIDN) - { - int idn_flags = 0; - if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) - idn_flags |= IDNA_ALLOW_UNASSIGNED; - if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) - idn_flags |= IDNA_USE_STD3_ASCII_RULES; - - char *out; - int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags); - if (rc != IDNA_SUCCESS) - { - if (rc == IDNA_MALLOC_ERROR) - result = -EAI_MEMORY; - else if (rc == IDNA_DLOPEN_ERROR) - result = -EAI_SYSTEM; - else - result = -EAI_IDN_ENCODE; - goto free_and_return; - } - /* In case the output string is the same as the input - string no new string has been allocated and we - make a copy. */ - if (out == canon) - goto make_copy; - canon = out; - } - else -#endif - { -#ifdef HAVE_LIBIDN - make_copy: -#endif - if (canonbuf != NULL) - /* We already allocated the string using malloc, but - the buffer is now owned by canon. */ - canonbuf = NULL; - else - { - canon = __strdup (canon); - if (canon == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - } - } - } - - family = at2->family; - if (family == AF_INET6) - { - socklen = sizeof (struct sockaddr_in6); - - /* If we looked up IPv4 mapped address discard them here if - the caller isn't interested in all address and we have - found at least one IPv6 address. */ - if (got_ipv6 - && (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED - && IN6_IS_ADDR_V4MAPPED (at2->addr)) - goto ignore; - } - else - socklen = sizeof (struct sockaddr_in); - - for (st2 = st; st2 != NULL; st2 = st2->next) - { - struct addrinfo *ai; - ai = *pai = malloc (sizeof (struct addrinfo) + socklen); - if (ai == NULL) - { - free ((char *) canon); - result = -EAI_MEMORY; - goto free_and_return; - } - - ai->ai_flags = req->ai_flags; - ai->ai_family = family; - ai->ai_socktype = st2->socktype; - ai->ai_protocol = st2->protocol; - ai->ai_addrlen = socklen; - ai->ai_addr = (void *) (ai + 1); - - /* We only add the canonical name once. */ - ai->ai_canonname = (char *) canon; - canon = NULL; - -#ifdef _HAVE_SA_LEN - ai->ai_addr->sa_len = socklen; -#endif /* _HAVE_SA_LEN */ - ai->ai_addr->sa_family = family; - - /* In case of an allocation error the list must be NULL - terminated. */ - ai->ai_next = NULL; - - if (family == AF_INET6) - { - struct sockaddr_in6 *sin6p = - (struct sockaddr_in6 *) ai->ai_addr; - - sin6p->sin6_port = st2->port; - sin6p->sin6_flowinfo = 0; - memcpy (&sin6p->sin6_addr, - at2->addr, sizeof (struct in6_addr)); - sin6p->sin6_scope_id = at2->scopeid; - } - else - { - struct sockaddr_in *sinp = - (struct sockaddr_in *) ai->ai_addr; - sinp->sin_port = st2->port; - memcpy (&sinp->sin_addr, - at2->addr, sizeof (struct in_addr)); - memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero)); - } - - pai = &(ai->ai_next); - } - - ++*naddrs; - - ignore: - at2 = at2->next; - } - } - - free_and_return: - if (malloc_name) - free ((char *) name); - free (addrmem); - free (canonbuf); - - return result; -} - - -struct sort_result -{ - struct addrinfo *dest_addr; - /* Using sockaddr_storage is for now overkill. We only support IPv4 - and IPv6 so far. If this changes at some point we can adjust the - type here. */ - struct sockaddr_in6 source_addr; - uint8_t source_addr_len; - bool got_source_addr; - uint8_t source_addr_flags; - uint8_t prefixlen; - uint32_t index; - int32_t native; -}; - -struct sort_result_combo -{ - struct sort_result *results; - int nresults; -}; - - -#if __BYTE_ORDER == __BIG_ENDIAN -# define htonl_c(n) n -#else -# define htonl_c(n) __bswap_constant_32 (n) -#endif - -static const struct scopeentry -{ - union - { - char addr[4]; - uint32_t addr32; - }; - uint32_t netmask; - int32_t scope; -} default_scopes[] = - { - /* Link-local addresses: scope 2. */ - { { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 }, - { { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 }, - /* Default: scope 14. */ - { { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 } - }; - -/* The label table. */ -static const struct scopeentry *scopes; - - -static int -get_scope (const struct sockaddr_in6 *in6) -{ - int scope; - if (in6->sin6_family == PF_INET6) - { - if (! IN6_IS_ADDR_MULTICAST (&in6->sin6_addr)) - { - if (IN6_IS_ADDR_LINKLOCAL (&in6->sin6_addr) - /* RFC 4291 2.5.3 says that the loopback address is to be - treated like a link-local address. */ - || IN6_IS_ADDR_LOOPBACK (&in6->sin6_addr)) - scope = 2; - else if (IN6_IS_ADDR_SITELOCAL (&in6->sin6_addr)) - scope = 5; - else - /* XXX Is this the correct default behavior? */ - scope = 14; - } - else - scope = in6->sin6_addr.s6_addr[1] & 0xf; - } - else if (in6->sin6_family == PF_INET) - { - const struct sockaddr_in *in = (const struct sockaddr_in *) in6; - - size_t cnt = 0; - while (1) - { - if ((in->sin_addr.s_addr & scopes[cnt].netmask) - == scopes[cnt].addr32) - return scopes[cnt].scope; - - ++cnt; - } - /* NOTREACHED */ - } - else - /* XXX What is a good default? */ - scope = 15; - - return scope; -} - - -struct prefixentry -{ - struct in6_addr prefix; - unsigned int bits; - int val; -}; - - -/* The label table. */ -static const struct prefixentry *labels; - -/* Default labels. */ -static const struct prefixentry default_labels[] = - { - /* See RFC 3484 for the details. */ - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } - }, 128, 0 }, - { { .__in6_u - = { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 16, 2 }, - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 96, 3 }, - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } } - }, 96, 4 }, - /* The next two entries differ from RFC 3484. We need to treat - IPv6 site-local addresses special because they are never NATed, - unlike site-locale IPv4 addresses. If this would not happen, on - machines which have only IPv4 and IPv6 site-local addresses, the - sorting would prefer the IPv6 site-local addresses, causing - unnecessary delays when trying to connect to a global IPv6 address - through a site-local IPv6 address. */ - { { .__in6_u - = { .__u6_addr8 = { 0xfe, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 10, 5 }, - { { .__in6_u - = { .__u6_addr8 = { 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 7, 6 }, - /* Additional rule for Teredo tunnels. */ - { { .__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 } - }; - - -/* The precedence table. */ -static const struct prefixentry *precedence; - -/* The default precedences. */ -static const struct prefixentry default_precedence[] = - { - /* See RFC 3484 for the details. */ - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } } - }, 128, 50 }, - { { .__in6_u - = { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 16, 30 }, - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 96, 20 }, - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } } - }, 96, 10 }, - { { .__in6_u - = { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } - }, 0, 40 } - }; - - -static int -match_prefix (const struct sockaddr_in6 *in6, - const struct prefixentry *list, int default_val) -{ - int idx; - struct sockaddr_in6 in6_mem; - - if (in6->sin6_family == PF_INET) - { - const struct sockaddr_in *in = (const struct sockaddr_in *) in6; - - /* Construct a V4-to-6 mapped address. */ - in6_mem.sin6_family = PF_INET6; - in6_mem.sin6_port = in->sin_port; - in6_mem.sin6_flowinfo = 0; - memset (&in6_mem.sin6_addr, '\0', sizeof (in6_mem.sin6_addr)); - in6_mem.sin6_addr.s6_addr16[5] = 0xffff; - in6_mem.sin6_addr.s6_addr32[3] = in->sin_addr.s_addr; - in6_mem.sin6_scope_id = 0; - - in6 = &in6_mem; - } - else if (in6->sin6_family != PF_INET6) - return default_val; - - for (idx = 0; ; ++idx) - { - unsigned int bits = list[idx].bits; - const uint8_t *mask = list[idx].prefix.s6_addr; - const uint8_t *val = in6->sin6_addr.s6_addr; - - while (bits >= 8) - { - if (*mask != *val) - break; - - ++mask; - ++val; - bits -= 8; - } - - if (bits < 8) - { - if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits))) - /* Match! */ - break; - } - } - - return list[idx].val; -} - - -static int -get_label (const struct sockaddr_in6 *in6) -{ - /* XXX What is a good default value? */ - return match_prefix (in6, labels, INT_MAX); -} - - -static int -get_precedence (const struct sockaddr_in6 *in6) -{ - /* XXX What is a good default value? */ - return match_prefix (in6, precedence, 0); -} - - -/* Find last bit set in a word. */ -static int -fls (uint32_t a) -{ - uint32_t mask; - int n; - for (n = 0, mask = 1 << 31; n < 32; mask >>= 1, ++n) - if ((a & mask) != 0) - break; - return n; -} - - -static int -rfc3484_sort (const void *p1, const void *p2, void *arg) -{ - const size_t idx1 = *(const size_t *) p1; - const size_t idx2 = *(const size_t *) p2; - struct sort_result_combo *src = (struct sort_result_combo *) arg; - struct sort_result *a1 = &src->results[idx1]; - struct sort_result *a2 = &src->results[idx2]; - - /* Rule 1: Avoid unusable destinations. - We have the got_source_addr flag set if the destination is reachable. */ - if (a1->got_source_addr && ! a2->got_source_addr) - return -1; - if (! a1->got_source_addr && a2->got_source_addr) - return 1; - - - /* Rule 2: Prefer matching scope. Only interesting if both - destination addresses are IPv6. */ - int a1_dst_scope - = get_scope ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); - - int a2_dst_scope - = get_scope ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); - - if (a1->got_source_addr) - { - int a1_src_scope = get_scope (&a1->source_addr); - int a2_src_scope = get_scope (&a2->source_addr); - - if (a1_dst_scope == a1_src_scope && a2_dst_scope != a2_src_scope) - return -1; - if (a1_dst_scope != a1_src_scope && a2_dst_scope == a2_src_scope) - return 1; - } - - - /* Rule 3: Avoid deprecated addresses. */ - if (a1->got_source_addr) - { - if (!(a1->source_addr_flags & in6ai_deprecated) - && (a2->source_addr_flags & in6ai_deprecated)) - return -1; - if ((a1->source_addr_flags & in6ai_deprecated) - && !(a2->source_addr_flags & in6ai_deprecated)) - return 1; - } - - /* Rule 4: Prefer home addresses. */ - if (a1->got_source_addr) - { - if (!(a1->source_addr_flags & in6ai_homeaddress) - && (a2->source_addr_flags & in6ai_homeaddress)) - return 1; - if ((a1->source_addr_flags & in6ai_homeaddress) - && !(a2->source_addr_flags & in6ai_homeaddress)) - return -1; - } - - /* Rule 5: Prefer matching label. */ - if (a1->got_source_addr) - { - int a1_dst_label - = get_label ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); - int a1_src_label = get_label (&a1->source_addr); - - int a2_dst_label - = get_label ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); - int a2_src_label = get_label (&a2->source_addr); - - if (a1_dst_label == a1_src_label && a2_dst_label != a2_src_label) - return -1; - if (a1_dst_label != a1_src_label && a2_dst_label == a2_src_label) - return 1; - } - - - /* Rule 6: Prefer higher precedence. */ - int a1_prec - = get_precedence ((struct sockaddr_in6 *) a1->dest_addr->ai_addr); - int a2_prec - = get_precedence ((struct sockaddr_in6 *) a2->dest_addr->ai_addr); - - if (a1_prec > a2_prec) - return -1; - if (a1_prec < a2_prec) - return 1; - - - /* Rule 7: Prefer native transport. */ - if (a1->got_source_addr) - { - /* The same interface index means the same interface which means - there is no difference in transport. This should catch many - (most?) cases. */ - if (a1->index != a2->index) - { - int a1_native = a1->native; - int a2_native = a2->native; - - if (a1_native == -1 || a2_native == -1) - { - uint32_t a1_index; - if (a1_native == -1) - { - /* If we do not have the information use 'native' as - the default. */ - a1_native = 0; - a1_index = a1->index; - } - else - a1_index = 0xffffffffu; - - uint32_t a2_index; - if (a2_native == -1) - { - /* If we do not have the information use 'native' as - the default. */ - a2_native = 0; - a2_index = a2->index; - } - else - a2_index = 0xffffffffu; - - __check_native (a1_index, &a1_native, a2_index, &a2_native); - - /* Fill in the results in all the records. */ - for (int i = 0; i < src->nresults; ++i) - if (a1_index != -1 && src->results[i].index == a1_index) - { - assert (src->results[i].native == -1 - || src->results[i].native == a1_native); - src->results[i].native = a1_native; - } - else if (a2_index != -1 && src->results[i].index == a2_index) - { - assert (src->results[i].native == -1 - || src->results[i].native == a2_native); - src->results[i].native = a2_native; - } - } - - if (a1_native && !a2_native) - return -1; - if (!a1_native && a2_native) - return 1; - } - } - - - /* Rule 8: Prefer smaller scope. */ - if (a1_dst_scope < a2_dst_scope) - return -1; - if (a1_dst_scope > a2_dst_scope) - return 1; - - - /* Rule 9: Use longest matching prefix. */ - if (a1->got_source_addr - && a1->dest_addr->ai_family == a2->dest_addr->ai_family) - { - int bit1 = 0; - int bit2 = 0; - - if (a1->dest_addr->ai_family == PF_INET) - { - assert (a1->source_addr.sin6_family == PF_INET); - assert (a2->source_addr.sin6_family == PF_INET); - - /* Outside of subnets, as defined by the network masks, - common address prefixes for IPv4 addresses make no sense. - So, define a non-zero value only if source and - destination address are on the same subnet. */ - struct sockaddr_in *in1_dst - = (struct sockaddr_in *) a1->dest_addr->ai_addr; - in_addr_t in1_dst_addr = ntohl (in1_dst->sin_addr.s_addr); - struct sockaddr_in *in1_src - = (struct sockaddr_in *) &a1->source_addr; - in_addr_t in1_src_addr = ntohl (in1_src->sin_addr.s_addr); - in_addr_t netmask1 = 0xffffffffu << (32 - a1->prefixlen); - - if ((in1_src_addr & netmask1) == (in1_dst_addr & netmask1)) - bit1 = fls (in1_dst_addr ^ in1_src_addr); - - struct sockaddr_in *in2_dst - = (struct sockaddr_in *) a2->dest_addr->ai_addr; - in_addr_t in2_dst_addr = ntohl (in2_dst->sin_addr.s_addr); - struct sockaddr_in *in2_src - = (struct sockaddr_in *) &a2->source_addr; - in_addr_t in2_src_addr = ntohl (in2_src->sin_addr.s_addr); - in_addr_t netmask2 = 0xffffffffu << (32 - a2->prefixlen); - - if ((in2_src_addr & netmask2) == (in2_dst_addr & netmask2)) - bit2 = fls (in2_dst_addr ^ in2_src_addr); - } - else if (a1->dest_addr->ai_family == PF_INET6) - { - assert (a1->source_addr.sin6_family == PF_INET6); - assert (a2->source_addr.sin6_family == PF_INET6); - - struct sockaddr_in6 *in1_dst; - struct sockaddr_in6 *in1_src; - struct sockaddr_in6 *in2_dst; - struct sockaddr_in6 *in2_src; - - in1_dst = (struct sockaddr_in6 *) a1->dest_addr->ai_addr; - in1_src = (struct sockaddr_in6 *) &a1->source_addr; - in2_dst = (struct sockaddr_in6 *) a2->dest_addr->ai_addr; - in2_src = (struct sockaddr_in6 *) &a2->source_addr; - - int i; - for (i = 0; i < 4; ++i) - if (in1_dst->sin6_addr.s6_addr32[i] - != in1_src->sin6_addr.s6_addr32[i] - || (in2_dst->sin6_addr.s6_addr32[i] - != in2_src->sin6_addr.s6_addr32[i])) - break; - - if (i < 4) - { - bit1 = fls (ntohl (in1_dst->sin6_addr.s6_addr32[i] - ^ in1_src->sin6_addr.s6_addr32[i])); - bit2 = fls (ntohl (in2_dst->sin6_addr.s6_addr32[i] - ^ in2_src->sin6_addr.s6_addr32[i])); - } - } - - if (bit1 > bit2) - return -1; - if (bit1 < bit2) - return 1; - } - - - /* Rule 10: Otherwise, leave the order unchanged. To ensure this - compare with the value indicating the order in which the entries - have been received from the services. NB: no two entries can have - the same order so the test will never return zero. */ - return idx1 < idx2 ? -1 : 1; -} - - -static int -in6aicmp (const void *p1, const void *p2) -{ - struct in6addrinfo *a1 = (struct in6addrinfo *) p1; - struct in6addrinfo *a2 = (struct in6addrinfo *) p2; - - return memcmp (a1->addr, a2->addr, sizeof (a1->addr)); -} - - -/* Name of the config file for RFC 3484 sorting (for now). */ -#define GAICONF_FNAME "/etc/gai.conf" - - -/* Non-zero if we are supposed to reload the config file automatically - whenever it changed. */ -static int gaiconf_reload_flag; - -/* Non-zero if gaiconf_reload_flag was ever set to true. */ -static int gaiconf_reload_flag_ever_set; - -/* Last modification time. */ -#ifdef _STATBUF_ST_NSEC - -static struct timespec gaiconf_mtime; - -static inline void -save_gaiconf_mtime (const struct stat64 *st) -{ - gaiconf_mtime = st->st_mtim; -} - -static inline bool -check_gaiconf_mtime (const struct stat64 *st) -{ - return (st->st_mtim.tv_sec == gaiconf_mtime.tv_sec - && st->st_mtim.tv_nsec == gaiconf_mtime.tv_nsec); -} - -#else - -static time_t gaiconf_mtime; - -static inline void -save_gaiconf_mtime (const struct stat64 *st) -{ - gaiconf_mtime = st->st_mtime; -} - -static inline bool -check_gaiconf_mtime (const struct stat64 *st) -{ - return st->st_mtime == gaiconf_mtime; -} - -#endif - - -libc_freeres_fn(fini) -{ - if (labels != default_labels) - { - const struct prefixentry *old = labels; - labels = default_labels; - free ((void *) old); - } - - if (precedence != default_precedence) - { - const struct prefixentry *old = precedence; - precedence = default_precedence; - free ((void *) old); - } - - if (scopes != default_scopes) - { - const struct scopeentry *old = scopes; - scopes = default_scopes; - free ((void *) old); - } -} - - -struct prefixlist -{ - struct prefixentry entry; - struct prefixlist *next; -}; - - -struct scopelist -{ - struct scopeentry entry; - struct scopelist *next; -}; - - -static void -free_prefixlist (struct prefixlist *list) -{ - while (list != NULL) - { - struct prefixlist *oldp = list; - list = list->next; - free (oldp); - } -} - - -static void -free_scopelist (struct scopelist *list) -{ - while (list != NULL) - { - struct scopelist *oldp = list; - list = list->next; - free (oldp); - } -} - - -static int -prefixcmp (const void *p1, const void *p2) -{ - const struct prefixentry *e1 = (const struct prefixentry *) p1; - const struct prefixentry *e2 = (const struct prefixentry *) p2; - - if (e1->bits < e2->bits) - return 1; - if (e1->bits == e2->bits) - return 0; - return -1; -} - - -static int -scopecmp (const void *p1, const void *p2) -{ - const struct scopeentry *e1 = (const struct scopeentry *) p1; - const struct scopeentry *e2 = (const struct scopeentry *) p2; - - if (e1->netmask > e2->netmask) - return -1; - if (e1->netmask == e2->netmask) - return 0; - return 1; -} - - -static void -gaiconf_init (void) -{ - struct prefixlist *labellist = NULL; - size_t nlabellist = 0; - bool labellist_nullbits = false; - struct prefixlist *precedencelist = NULL; - size_t nprecedencelist = 0; - bool precedencelist_nullbits = false; - struct scopelist *scopelist = NULL; - size_t nscopelist = 0; - bool scopelist_nullbits = false; - - FILE *fp = fopen (GAICONF_FNAME, "rce"); - if (fp != NULL) - { - struct stat64 st; - if (__fxstat64 (_STAT_VER, fileno (fp), &st) != 0) - { - fclose (fp); - goto no_file; - } - - char *line = NULL; - size_t linelen = 0; - - __fsetlocking (fp, FSETLOCKING_BYCALLER); - - while (!feof_unlocked (fp)) - { - ssize_t n = __getline (&line, &linelen, fp); - if (n <= 0) - break; - - /* Handle comments. No escaping possible so this is easy. */ - char *cp = strchr (line, '#'); - if (cp != NULL) - *cp = '\0'; - - cp = line; - while (isspace (*cp)) - ++cp; - - char *cmd = cp; - while (*cp != '\0' && !isspace (*cp)) - ++cp; - size_t cmdlen = cp - cmd; - - if (*cp != '\0') - *cp++ = '\0'; - while (isspace (*cp)) - ++cp; - - char *val1 = cp; - while (*cp != '\0' && !isspace (*cp)) - ++cp; - size_t val1len = cp - cmd; - - /* We always need at least two values. */ - if (val1len == 0) - continue; - - if (*cp != '\0') - *cp++ = '\0'; - while (isspace (*cp)) - ++cp; - - char *val2 = cp; - while (*cp != '\0' && !isspace (*cp)) - ++cp; - - /* Ignore the rest of the line. */ - *cp = '\0'; - - struct prefixlist **listp; - size_t *lenp; - bool *nullbitsp; - switch (cmdlen) - { - case 5: - if (strcmp (cmd, "label") == 0) - { - struct in6_addr prefix; - unsigned long int bits; - unsigned long int val; - char *endp; - - listp = &labellist; - lenp = &nlabellist; - nullbitsp = &labellist_nullbits; - - new_elem: - bits = 128; - __set_errno (0); - cp = strchr (val1, '/'); - if (cp != NULL) - *cp++ = '\0'; - if (inet_pton (AF_INET6, val1, &prefix) - && (cp == NULL - || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && bits <= 128 - && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && val <= INT_MAX) - { - struct prefixlist *newp = malloc (sizeof (*newp)); - if (newp == NULL) - { - free (line); - fclose (fp); - goto no_file; - } - - memcpy (&newp->entry.prefix, &prefix, sizeof (prefix)); - newp->entry.bits = bits; - newp->entry.val = val; - newp->next = *listp; - *listp = newp; - ++*lenp; - *nullbitsp |= bits == 0; - } - } - break; - - case 6: - if (strcmp (cmd, "reload") == 0) - { - gaiconf_reload_flag = strcmp (val1, "yes") == 0; - if (gaiconf_reload_flag) - gaiconf_reload_flag_ever_set = 1; - } - break; - - case 7: - if (strcmp (cmd, "scopev4") == 0) - { - struct in6_addr prefix; - unsigned long int bits; - unsigned long int val; - char *endp; - - bits = 32; - __set_errno (0); - cp = strchr (val1, '/'); - if (cp != NULL) - *cp++ = '\0'; - if (inet_pton (AF_INET6, val1, &prefix)) - { - bits = 128; - if (IN6_IS_ADDR_V4MAPPED (&prefix) - && (cp == NULL - || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && bits >= 96 - && bits <= 128 - && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && val <= INT_MAX) - { - struct scopelist *newp; - new_scope: - newp = malloc (sizeof (*newp)); - if (newp == NULL) - { - free (line); - fclose (fp); - goto no_file; - } - - newp->entry.netmask = htonl (bits != 96 - ? (0xffffffff - << (128 - bits)) - : 0); - newp->entry.addr32 = (prefix.s6_addr32[3] - & newp->entry.netmask); - newp->entry.scope = val; - newp->next = scopelist; - scopelist = newp; - ++nscopelist; - scopelist_nullbits |= bits == 96; - } - } - else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3]) - && (cp == NULL - || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && bits <= 32 - && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX - || errno != ERANGE) - && *endp == '\0' - && val <= INT_MAX) - { - bits += 96; - goto new_scope; - } - } - break; - - case 10: - if (strcmp (cmd, "precedence") == 0) - { - listp = &precedencelist; - lenp = &nprecedencelist; - nullbitsp = &precedencelist_nullbits; - goto new_elem; - } - break; - } - } - - free (line); - - fclose (fp); - - /* Create the array for the labels. */ - struct prefixentry *new_labels; - if (nlabellist > 0) - { - if (!labellist_nullbits) - ++nlabellist; - new_labels = malloc (nlabellist * sizeof (*new_labels)); - if (new_labels == NULL) - goto no_file; - - int i = nlabellist; - if (!labellist_nullbits) - { - --i; - memset (&new_labels[i].prefix, '\0', sizeof (struct in6_addr)); - new_labels[i].bits = 0; - new_labels[i].val = 1; - } - - struct prefixlist *l = labellist; - while (i-- > 0) - { - new_labels[i] = l->entry; - l = l->next; - } - free_prefixlist (labellist); - - /* Sort the entries so that the most specific ones are at - the beginning. */ - qsort (new_labels, nlabellist, sizeof (*new_labels), prefixcmp); - } - else - new_labels = (struct prefixentry *) default_labels; - - struct prefixentry *new_precedence; - if (nprecedencelist > 0) - { - if (!precedencelist_nullbits) - ++nprecedencelist; - new_precedence = malloc (nprecedencelist * sizeof (*new_precedence)); - if (new_precedence == NULL) - { - if (new_labels != default_labels) - free (new_labels); - goto no_file; - } - - int i = nprecedencelist; - if (!precedencelist_nullbits) - { - --i; - memset (&new_precedence[i].prefix, '\0', - sizeof (struct in6_addr)); - new_precedence[i].bits = 0; - new_precedence[i].val = 40; - } - - struct prefixlist *l = precedencelist; - while (i-- > 0) - { - new_precedence[i] = l->entry; - l = l->next; - } - free_prefixlist (precedencelist); - - /* Sort the entries so that the most specific ones are at - the beginning. */ - qsort (new_precedence, nprecedencelist, sizeof (*new_precedence), - prefixcmp); - } - else - new_precedence = (struct prefixentry *) default_precedence; - - struct scopeentry *new_scopes; - if (nscopelist > 0) - { - if (!scopelist_nullbits) - ++nscopelist; - new_scopes = malloc (nscopelist * sizeof (*new_scopes)); - if (new_scopes == NULL) - { - if (new_labels != default_labels) - free (new_labels); - if (new_precedence != default_precedence) - free (new_precedence); - goto no_file; - } - - int i = nscopelist; - if (!scopelist_nullbits) - { - --i; - new_scopes[i].addr32 = 0; - new_scopes[i].netmask = 0; - new_scopes[i].scope = 14; - } - - struct scopelist *l = scopelist; - while (i-- > 0) - { - new_scopes[i] = l->entry; - l = l->next; - } - free_scopelist (scopelist); - - /* Sort the entries so that the most specific ones are at - the beginning. */ - qsort (new_scopes, nscopelist, sizeof (*new_scopes), - scopecmp); - } - else - new_scopes = (struct scopeentry *) default_scopes; - - /* Now we are ready to replace the values. */ - const struct prefixentry *old = labels; - labels = new_labels; - if (old != default_labels) - free ((void *) old); - - old = precedence; - precedence = new_precedence; - if (old != default_precedence) - free ((void *) old); - - const struct scopeentry *oldscope = scopes; - scopes = new_scopes; - if (oldscope != default_scopes) - free ((void *) oldscope); - - save_gaiconf_mtime (&st); - } - else - { - no_file: - free_prefixlist (labellist); - free_prefixlist (precedencelist); - free_scopelist (scopelist); - - /* If we previously read the file but it is gone now, free the - old data and use the builtin one. Leave the reload flag - alone. */ - fini (); - } -} - - -static void -gaiconf_reload (void) -{ - struct stat64 st; - if (__xstat64 (_STAT_VER, GAICONF_FNAME, &st) != 0 - || !check_gaiconf_mtime (&st)) - gaiconf_init (); -} - - -int -getaddrinfo (const char *name, const char *service, - const struct addrinfo *hints, struct addrinfo **pai) -{ - int i = 0, last_i = 0; - int nresults = 0; - struct addrinfo *p = NULL; - struct gaih_service gaih_service, *pservice; - struct addrinfo local_hints; - - if (name != NULL && name[0] == '*' && name[1] == 0) - name = NULL; - - if (service != NULL && service[0] == '*' && service[1] == 0) - service = NULL; - - if (name == NULL && service == NULL) - return EAI_NONAME; - - if (hints == NULL) - hints = &default_hints; - - if (hints->ai_flags - & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED -#ifdef HAVE_LIBIDN - |AI_IDN|AI_CANONIDN|AI_IDN_ALLOW_UNASSIGNED - |AI_IDN_USE_STD3_ASCII_RULES -#endif - |AI_NUMERICSERV|AI_ALL)) - return EAI_BADFLAGS; - - if ((hints->ai_flags & AI_CANONNAME) && name == NULL) - return EAI_BADFLAGS; - - struct in6addrinfo *in6ai = NULL; - size_t in6ailen = 0; - bool seen_ipv4 = false; - bool seen_ipv6 = false; - bool check_pf_called = false; - - if (hints->ai_flags & AI_ADDRCONFIG) - { - /* We might need information about what interfaces are available. - Also 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); - check_pf_called = true; - - /* Now make a decision on what we return, if anything. */ - if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6)) - { - /* If we haven't seen both IPv4 and IPv6 interfaces we can - narrow down the search. */ - if ((! seen_ipv4 || ! seen_ipv6) && (seen_ipv4 || seen_ipv6)) - { - local_hints = *hints; - local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6; - hints = &local_hints; - } - } - else if ((hints->ai_family == PF_INET && ! seen_ipv4) - || (hints->ai_family == PF_INET6 && ! seen_ipv6)) - { - /* We cannot possibly return a valid answer. */ - __free_in6ai (in6ai); - return EAI_NONAME; - } - } - - if (service && service[0]) - { - char *c; - gaih_service.name = service; - gaih_service.num = strtoul (gaih_service.name, &c, 10); - if (*c != '\0') - { - if (hints->ai_flags & AI_NUMERICSERV) - { - __free_in6ai (in6ai); - return EAI_NONAME; - } - - gaih_service.num = -1; - } - - pservice = &gaih_service; - } - else - pservice = NULL; - - struct addrinfo **end = &p; - - unsigned int naddrs = 0; - if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET - || hints->ai_family == AF_INET6) - { - struct scratch_buffer tmpbuf; - scratch_buffer_init (&tmpbuf); - last_i = gaih_inet (name, pservice, hints, end, &naddrs, &tmpbuf); - scratch_buffer_free (&tmpbuf); - - if (last_i != 0) - { - freeaddrinfo (p); - __free_in6ai (in6ai); - - return -last_i; - } - while (*end) - { - end = &((*end)->ai_next); - ++nresults; - } - } - else - { - __free_in6ai (in6ai); - return EAI_FAMILY; - } - - if (naddrs > 1) - { - /* Read the config file. */ - __libc_once_define (static, once); - __typeof (once) old_once = once; - __libc_once (once, gaiconf_init); - /* Sort results according to RFC 3484. */ - struct sort_result *results; - size_t *order; - struct addrinfo *q; - struct addrinfo *last = NULL; - char *canonname = NULL; - bool malloc_results; - size_t alloc_size = nresults * (sizeof (*results) + sizeof (size_t)); - - malloc_results - = !__libc_use_alloca (alloc_size); - if (malloc_results) - { - results = malloc (alloc_size); - if (results == NULL) - { - __free_in6ai (in6ai); - return EAI_MEMORY; - } - } - else - results = alloca (alloc_size); - order = (size_t *) (results + nresults); - - /* Now we definitely need the interface information. */ - if (! check_pf_called) - __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen); - - /* If we have information about deprecated and temporary addresses - sort the array now. */ - if (in6ai != NULL) - qsort (in6ai, in6ailen, sizeof (*in6ai), in6aicmp); - - int fd = -1; - int af = AF_UNSPEC; - - for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next) - { - results[i].dest_addr = q; - results[i].native = -1; - order[i] = i; - - /* If we just looked up the address for a different - protocol, reuse the result. */ - if (last != NULL && last->ai_addrlen == q->ai_addrlen - && memcmp (last->ai_addr, q->ai_addr, q->ai_addrlen) == 0) - { - memcpy (&results[i].source_addr, &results[i - 1].source_addr, - results[i - 1].source_addr_len); - results[i].source_addr_len = results[i - 1].source_addr_len; - results[i].got_source_addr = results[i - 1].got_source_addr; - results[i].source_addr_flags = results[i - 1].source_addr_flags; - results[i].prefixlen = results[i - 1].prefixlen; - results[i].index = results[i - 1].index; - } - else - { - results[i].got_source_addr = false; - results[i].source_addr_flags = 0; - results[i].prefixlen = 0; - results[i].index = 0xffffffffu; - - /* We overwrite the type with SOCK_DGRAM since we do not - want connect() to connect to the other side. If we - cannot determine the source address remember this - fact. */ - if (fd == -1 || (af == AF_INET && q->ai_family == AF_INET6)) - { - if (fd != -1) - close_retry: - close_not_cancel_no_status (fd); - af = q->ai_family; - fd = __socket (af, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP); - } - else - { - /* Reset the connection. */ - struct sockaddr sa = { .sa_family = AF_UNSPEC }; - __connect (fd, &sa, sizeof (sa)); - } - - socklen_t sl = sizeof (results[i].source_addr); - if (fd != -1 - && __connect (fd, q->ai_addr, q->ai_addrlen) == 0 - && __getsockname (fd, - (struct sockaddr *) &results[i].source_addr, - &sl) == 0) - { - results[i].source_addr_len = sl; - results[i].got_source_addr = true; - - if (in6ai != NULL) - { - /* See whether the source address is on the list of - deprecated or temporary addresses. */ - struct in6addrinfo tmp; - - if (q->ai_family == AF_INET && af == AF_INET) - { - struct sockaddr_in *sinp - = (struct sockaddr_in *) &results[i].source_addr; - tmp.addr[0] = 0; - tmp.addr[1] = 0; - tmp.addr[2] = htonl (0xffff); - /* Special case for lo interface, the source address - being possibly different than the interface - address. */ - if ((ntohl(sinp->sin_addr.s_addr) & 0xff000000) - == 0x7f000000) - tmp.addr[3] = htonl(0x7f000001); - else - tmp.addr[3] = sinp->sin_addr.s_addr; - } - else - { - struct sockaddr_in6 *sin6p - = (struct sockaddr_in6 *) &results[i].source_addr; - memcpy (tmp.addr, &sin6p->sin6_addr, IN6ADDRSZ); - } - - struct in6addrinfo *found - = bsearch (&tmp, in6ai, in6ailen, sizeof (*in6ai), - in6aicmp); - if (found != NULL) - { - results[i].source_addr_flags = found->flags; - results[i].prefixlen = found->prefixlen; - results[i].index = found->index; - } - } - - if (q->ai_family == AF_INET && af == AF_INET6) - { - /* We have to convert the address. The socket is - IPv6 and the request is for IPv4. */ - struct sockaddr_in6 *sin6 - = (struct sockaddr_in6 *) &results[i].source_addr; - struct sockaddr_in *sin - = (struct sockaddr_in *) &results[i].source_addr; - assert (IN6_IS_ADDR_V4MAPPED (sin6->sin6_addr.s6_addr32)); - sin->sin_family = AF_INET; - /* We do not have to initialize sin_port since this - fields has the same position and size in the IPv6 - structure. */ - assert (offsetof (struct sockaddr_in, sin_port) - == offsetof (struct sockaddr_in6, sin6_port)); - assert (sizeof (sin->sin_port) - == sizeof (sin6->sin6_port)); - memcpy (&sin->sin_addr, - &sin6->sin6_addr.s6_addr32[3], INADDRSZ); - results[i].source_addr_len = sizeof (struct sockaddr_in); - } - } - else if (errno == EAFNOSUPPORT && af == AF_INET6 - && q->ai_family == AF_INET) - /* This could mean IPv6 sockets are IPv6-only. */ - goto close_retry; - else - /* Just make sure that if we have to process the same - address again we do not copy any memory. */ - results[i].source_addr_len = 0; - } - - /* Remember the canonical name. */ - if (q->ai_canonname != NULL) - { - assert (canonname == NULL); - canonname = q->ai_canonname; - q->ai_canonname = NULL; - } - } - - if (fd != -1) - close_not_cancel_no_status (fd); - - /* We got all the source addresses we can get, now sort using - the information. */ - struct sort_result_combo src - = { .results = results, .nresults = nresults }; - if (__glibc_unlikely (gaiconf_reload_flag_ever_set)) - { - __libc_lock_define_initialized (static, lock); - - __libc_lock_lock (lock); - if (__libc_once_get (old_once) && gaiconf_reload_flag) - gaiconf_reload (); - __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src); - __libc_lock_unlock (lock); - } - else - __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src); - - /* Queue the results up as they come out of sorting. */ - q = p = results[order[0]].dest_addr; - for (i = 1; i < nresults; ++i) - q = q->ai_next = results[order[i]].dest_addr; - q->ai_next = NULL; - - /* Fill in the canonical name into the new first entry. */ - p->ai_canonname = canonname; - - if (malloc_results) - free (results); - } - - __free_in6ai (in6ai); - - if (p) - { - *pai = p; - return 0; - } - - return last_i ? -last_i : EAI_NONAME; -} -libc_hidden_def (getaddrinfo) - -nss_interface_function (getaddrinfo) - -void -freeaddrinfo (struct addrinfo *ai) -{ - struct addrinfo *p; - - while (ai != NULL) - { - p = ai; - ai = ai->ai_next; - free (p->ai_canonname); - free (p); - } -} -libc_hidden_def (freeaddrinfo) |