+/* Host and service name lookups using Name Service Switch modules.
+ Copyright (C) 1996-2019 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
#include <errno.h>
#include <ifaddrs.h>
#include <netdb.h>
-#include <resolv.h>
+#include <nss.h>
+#include <resolv/resolv-internal.h>
+#include <resolv/resolv_context.h>
+#include <resolv/res_use_inet6.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/utsname.h>
#include <unistd.h>
#include <nsswitch.h>
-#include <bits/libc-lock.h>
+#include <libc-lock.h>
#include <not-cancel.h>
#include <nscd/nscd-client.h>
#include <nscd/nscd_proto.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
-
-#define GAIH_OKIFUNSPEC 0x0100
-#define GAIH_EAI ~(GAIH_OKIFUNSPEC)
+/* Former AI_IDN_ALLOW_UNASSIGNED and AI_IDN_USE_STD3_ASCII_RULES
+ flags, now ignored. */
+#define DEPRECATED_AI_IDN 0x300
-#ifndef UNIX_PATH_MAX
-# define UNIX_PATH_MAX 108
+#if IS_IN (libc)
+# define feof_unlocked(fp) __feof_unlocked (fp)
#endif
struct gaih_service
static const struct gaih_servtuple nullserv;
-struct gaih_addrtuple
- {
- struct gaih_addrtuple *next;
- char *name;
- int family;
- uint32_t addr[4];
- uint32_t scopeid;
- };
struct gaih_typeproto
{
int socktype;
int protocol;
- char name[4];
- int protoflag;
+ uint8_t protoflag;
+ bool defaultflag;
+ char name[8];
};
/* Values for `protoflag'. */
static const struct gaih_typeproto gaih_inet_typeproto[] =
{
- { 0, 0, "", 0 },
- { SOCK_STREAM, IPPROTO_TCP, "tcp", 0 },
- { SOCK_DGRAM, IPPROTO_UDP, "udp", 0 },
- { SOCK_RAW, 0, "raw", GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE },
- { 0, 0, "", 0 }
+ { 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, "" }
};
-struct gaih
- {
- int family;
- int (*gaih)(const char *name, const struct gaih_service *service,
- const struct addrinfo *req, struct addrinfo **pai,
- unsigned int *naddrs);
- };
-
static const struct addrinfo default_hints =
{
.ai_flags = AI_DEFAULT,
static int
gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
- const struct addrinfo *req, struct gaih_servtuple *st)
+ const struct addrinfo *req, struct gaih_servtuple *st,
+ struct scratch_buffer *tmpbuf)
{
struct servent *s;
- size_t tmpbuflen = 1024;
struct servent ts;
- char *tmpbuf;
int r;
do
{
- tmpbuf = __alloca (tmpbuflen);
-
- r = __getservbyname_r (servicename, tp->name, &ts, tmpbuf, tmpbuflen,
- &s);
+ r = __getservbyname_r (servicename, tp->name, &ts,
+ tmpbuf->data, tmpbuf->length, &s);
if (r != 0 || s == NULL)
{
if (r == ERANGE)
- tmpbuflen *= 2;
+ {
+ if (!scratch_buffer_grow (tmpbuf))
+ return -EAI_MEMORY;
+ }
else
- return GAIH_OKIFUNSPEC | -EAI_SERVICE;
+ return -EAI_SERVICE;
}
}
while (r);
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 a
+ linked-list. The new addresses are appended at the end. */
+static bool
+convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
+ int family,
+ struct hostent *h,
+ struct gaih_addrtuple **result)
+{
+ while (*result)
+ result = &(*result)->next;
+
+ /* 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 i; \
- 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, tmpbuflen, \
- &rc, &herrno, NULL, &localcanon)); \
- if (rc != ERANGE || herrno != NETDB_INTERNAL) \
- break; \
- tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
- } \
- if (status == NSS_STATUS_SUCCESS && rc == 0) \
- h = &th; \
- else \
- h = NULL; \
- if (rc != 0) \
+ while (1) \
+ { \
+ status = DL_CALL_FCT (fct, (name, _family, &th, \
+ tmpbuf->data, tmpbuf->length, \
+ &errno, &h_errno, NULL, &localcanon)); \
+ if (status != NSS_STATUS_TRYAGAIN || h_errno != NETDB_INTERNAL \
+ || errno != ERANGE) \
+ break; \
+ if (!scratch_buffer_grow (tmpbuf)) \
+ { \
+ __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \
+ __resolv_context_put (res_ctx); \
+ result = -EAI_MEMORY; \
+ goto free_and_return; \
+ } \
+ } \
+ if (status == NSS_STATUS_NOTFOUND \
+ || status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL) \
{ \
- if (herrno == NETDB_INTERNAL) \
+ if (h_errno == NETDB_INTERNAL) \
{ \
- __set_h_errno (herrno); \
- return -EAI_SYSTEM; \
+ __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \
+ __resolv_context_put (res_ctx); \
+ result = -EAI_SYSTEM; \
+ goto free_and_return; \
} \
- if (herrno == TRY_AGAIN) \
+ if (h_errno == TRY_AGAIN) \
no_data = EAI_AGAIN; \
else \
- no_data = herrno == NO_DATA; \
+ no_data = h_errno == NO_DATA; \
} \
- else if (h != NULL) \
+ else if (status == NSS_STATUS_SUCCESS) \
{ \
- for (i = 0; h->h_addr_list[i]; i++) \
+ if (!convert_hostent_to_gaih_addrtuple (req, _family, &th, &addrmem)) \
{ \
- if (*pat == NULL) \
- { \
- *pat = __alloca (sizeof (struct gaih_addrtuple)); \
- (*pat)->scopeid = 0; \
- } \
- uint32_t *addr = (*pat)->addr; \
- (*pat)->next = NULL; \
- (*pat)->name = i == 0 ? strdupa (h->h_name) : NULL; \
- if (_family == AF_INET && req->ai_family == AF_INET6) \
- { \
- (*pat)->family = AF_INET6; \
- addr[3] = *(uint32_t *) h->h_addr_list[i]; \
- addr[2] = htonl (0xffff); \
- addr[1] = 0; \
- addr[0] = 0; \
- } \
- else \
+ __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \
+ __resolv_context_put (res_ctx); \
+ result = -EAI_SYSTEM; \
+ goto free_and_return; \
+ } \
+ *pat = addrmem; \
+ \
+ if (localcanon != NULL && canon == NULL) \
+ { \
+ canonbuf = __strdup (localcanon); \
+ if (canonbuf == NULL) \
{ \
- (*pat)->family = _family; \
- memcpy (addr, h->h_addr_list[i], sizeof(_type)); \
+ result = -EAI_SYSTEM; \
+ goto free_and_return; \
} \
- pat = &((*pat)->next); \
+ canon = canonbuf; \
} \
- \
- if (localcanon != NULL && canon == NULL) \
- canon = strdupa (localcanon); \
- \
- if (_family == AF_INET6 && i > 0) \
+ 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,
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];
+ if (DL_CALL_FCT (cfct, (at->name ?: name, buf, sizeof (buf),
+ &s, &errno, &h_errno)) != 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)
+ 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;
if (! tp->name[0])
{
if (req->ai_socktype)
- return GAIH_OKIFUNSPEC | -EAI_SOCKTYPE;
+ return -EAI_SOCKTYPE;
else
- return GAIH_OKIFUNSPEC | -EAI_SERVICE;
+ return -EAI_SERVICE;
}
}
if (service != NULL)
{
if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
- return GAIH_OKIFUNSPEC | -EAI_SERVICE;
+ return -EAI_SERVICE;
if (service->num < 0)
{
if (tp->name[0])
{
st = (struct gaih_servtuple *)
- __alloca (sizeof (struct gaih_servtuple));
+ alloca_account (sizeof (struct gaih_servtuple), alloca_used);
- if ((rc = gaih_inet_serv (service->name, tp, req, st)))
+ int rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf);
+ if (__glibc_unlikely (rc != 0))
return rc;
}
else
continue;
newp = (struct gaih_servtuple *)
- __alloca (sizeof (struct gaih_servtuple));
+ alloca_account (sizeof (struct gaih_servtuple),
+ alloca_used);
- if ((rc = gaih_inet_serv (service->name, tp, req, newp)))
- {
- if (rc & GAIH_OKIFUNSPEC)
- continue;
- return rc;
- }
+ if (gaih_inet_serv (service->name,
+ tp, req, newp, tmpbuf) != 0)
+ continue;
*pst = newp;
pst = &(newp->next);
}
if (st == (struct gaih_servtuple *) &nullserv)
- return GAIH_OKIFUNSPEC | -EAI_SERVICE;
+ return -EAI_SERVICE;
}
}
else
if (req->ai_socktype || req->ai_protocol)
{
- st = __alloca (sizeof (struct gaih_servtuple));
+ st = alloca_account (sizeof (struct gaih_servtuple), alloca_used);
st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
we know about. */
struct gaih_servtuple **lastp = &st;
for (++tp; tp->name[0]; ++tp)
- {
- struct gaih_servtuple *newp;
+ if (tp->defaultflag)
+ {
+ struct gaih_servtuple *newp;
- newp = __alloca (sizeof (struct gaih_servtuple));
- newp->next = NULL;
- newp->socktype = tp->socktype;
- newp->protocol = tp->protocol;
- newp->port = port;
+ 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;
- }
+ *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 (sizeof (struct gaih_addrtuple));
-
+ 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)
- {
- 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 = strdupa (p);
- free (p);
- }
+ char *out;
+ result = __idna_to_dns_encoding (name, &out);
+ if (result != 0)
+ return -result;
+ name = out;
+ malloc_name = true;
}
-#endif
- if (__inet_aton (name, (struct in_addr *) at->addr) != 0)
+ if (__inet_aton_exact (name, (struct in_addr *) at->addr) != 0)
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
at->family = AF_INET;
at->family = AF_INET6;
}
else
- return -EAI_ADDRFAMILY;
+ {
+ result = -EAI_ADDRFAMILY;
+ goto free_and_return;
+ }
if (req->ai_flags & AI_CANONNAME)
canon = name;
}
else if (at->family == AF_UNSPEC)
{
- char *namebuf = (char *) name;
char *scope_delim = strchr (name, SCOPE_DELIMITER);
-
- if (__builtin_expect (scope_delim != NULL, 0))
- {
- namebuf = alloca (scope_delim - name + 1);
- *((char *) __mempcpy (namebuf, name, scope_delim - name)) = '\0';
- }
-
- if (inet_pton (AF_INET6, namebuf, at->addr) > 0)
+ int e;
+ if (scope_delim == NULL)
+ e = inet_pton (AF_INET6, name, at->addr);
+ else
+ e = __inet_pton_length (AF_INET6, name, scope_delim - name,
+ at->addr);
+ if (e > 0)
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
at->family = AF_INET6;
at->family = AF_INET;
}
else
- return -EAI_ADDRFAMILY;
-
- if (scope_delim != NULL)
{
- int try_numericscope = 0;
- if (IN6_IS_ADDR_LINKLOCAL (at->addr)
- || IN6_IS_ADDR_MC_LINKLOCAL (at->addr))
- {
- at->scopeid = if_nametoindex (scope_delim + 1);
- if (at->scopeid == 0)
- try_numericscope = 1;
- }
- else
- try_numericscope = 1;
+ result = -EAI_ADDRFAMILY;
+ goto free_and_return;
+ }
- if (try_numericscope != 0)
- {
- char *end;
- assert (sizeof (uint32_t) <= sizeof (unsigned long));
- at->scopeid = (uint32_t) strtoul (scope_delim + 1, &end,
- 10);
- if (*end != '\0')
- return GAIH_OKIFUNSPEC | -EAI_NONAME;
- }
+ 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)
struct gaih_addrtuple **pat = &at;
int no_data = 0;
int no_inet6_data = 0;
- service_user *nip = NULL;
+ 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;
+ struct resolv_context *res_ctx = NULL;
+ bool res_enable_inet6 = false;
- /* If we do not have to look for IPv4 and IPv6 together, use
- the simple, old functions. */
+ /* 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_family == AF_INET6
- && ((req->ai_flags & AI_V4MAPPED) == 0
- || (req->ai_flags & AI_ALL) == 0)))
+ && (req->ai_flags & AI_CANONNAME) == 0)
{
- int family = req->ai_family;
- size_t tmpbuflen = 512;
- char *tmpbuf = alloca (tmpbuflen);
int rc;
struct hostent th;
struct hostent *h;
- int herrno;
- simple_again:
while (1)
{
- rc = __gethostbyname2_r (name, family, &th, tmpbuf,
- tmpbuflen, &h, &herrno);
- if (rc != ERANGE || herrno != NETDB_INTERNAL)
+ rc = __gethostbyname2_r (name, AF_INET, &th,
+ tmpbuf->data, tmpbuf->length,
+ &h, &h_errno);
+ if (rc != ERANGE || h_errno != NETDB_INTERNAL)
break;
- tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
+ if (!scratch_buffer_grow (tmpbuf))
+ {
+ result = -EAI_MEMORY;
+ goto free_and_return;
+ }
}
if (rc == 0)
{
- if (h == NULL)
+ if (h != NULL)
{
- if (req->ai_family == AF_INET6
- && (req->ai_flags & AI_V4MAPPED)
- && family == AF_INET6)
+ /* We found data, convert it. */
+ if (!convert_hostent_to_gaih_addrtuple
+ (req, AF_INET, h, &addrmem))
{
- /* Try again, this time looking for IPv4
- addresses. */
- family = AF_INET;
- goto simple_again;
+ result = -EAI_MEMORY;
+ goto free_and_return;
}
+ *pat = addrmem;
}
else
{
- /* We found data, now convert it into the list. */
- for (int i = 0; h->h_addr_list[i]; ++i)
- {
- if (*pat == NULL)
- {
- *pat = __alloca (sizeof (struct gaih_addrtuple));
- (*pat)->scopeid = 0;
- }
- (*pat)->next = NULL;
- (*pat)->family = req->ai_family;
- if (family == req->ai_family)
- memcpy ((*pat)->addr, h->h_addr_list[i],
- h->h_length);
- else
- {
- uint32_t *addr = (uint32_t *) (*pat)->addr;
- addr[3] = *(uint32_t *) h->h_addr_list[i];
- addr[2] = htonl (0xffff);
- addr[1] = 0;
- addr[0] = 0;
- }
- pat = &((*pat)->next);
- }
+ if (h_errno == NO_DATA)
+ result = -EAI_NODATA;
+ else
+ result = -EAI_NONAME;
+ goto free_and_return;
}
}
else
{
- if (herrno == NETDB_INTERNAL)
- {
- __set_h_errno (herrno);
- return -EAI_SYSTEM;
- }
- if (herrno == TRY_AGAIN)
- {
- return -EAI_AGAIN;
- }
- /* We made requests but they turned out no data.
- The name is known, though. */
- return GAIH_OKIFUNSPEC | -EAI_NODATA;
+ if (h_errno == NETDB_INTERNAL)
+ result = -EAI_SYSTEM;
+ else if (h_errno == 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;
&& ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY)
__nss_not_use_nscd_hosts = 0;
- if (!__nss_not_use_nscd_hosts)
+ 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);
+ int err = __nscd_getai (name, &air, &h_errno);
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 = __alloca (sizeof (struct gaih_addrtuple));
+ *pat = addrfree++;
(*pat)->scopeid = 0;
}
uint32_t *pataddr = (*pat)->addr;
(*pat)->next = NULL;
if (added_canon || air->canon == NULL)
(*pat)->name = NULL;
- else
- canon = (*pat)->name = strdupa (air->canon);
+ 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
free (air);
if (at->family == AF_UNSPEC)
- return GAIH_OKIFUNSPEC | -EAI_NONAME;
+ {
+ result = -EAI_NONAME;
+ goto free_and_return;
+ }
goto process_list;
}
- else if (err != 0 && __nss_not_use_nscd_hosts == 0)
+ 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)
- return -EAI_MEMORY;
- if (herrno == TRY_AGAIN)
- return -EAI_AGAIN;
- return -EAI_SYSTEM;
+ if (h_errno == NETDB_INTERNAL && errno == ENOMEM)
+ result = -EAI_MEMORY;
+ else if (h_errno == TRY_AGAIN)
+ result = -EAI_AGAIN;
+ else
+ result = -EAI_SYSTEM;
+
+ goto free_and_return;
}
}
#endif
- if (__nss_hosts_database != NULL)
- {
- no_more = 0;
- nip = __nss_hosts_database;
- }
- else
+ if (__nss_hosts_database == NULL)
no_more = __nss_database_lookup ("hosts", NULL,
"dns [!UNAVAIL=return] files",
- &nip);
-
- if (__res_maybe_init (&_res, 0) == -1)
- no_more = 1;
+ &__nss_hosts_database);
+ else
+ no_more = 0;
+ nip = __nss_hosts_database;
/* 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 &= ~RES_USE_INET6;
-
- size_t tmpbuflen = 512;
- char *tmpbuf = alloca (tmpbuflen);
+ addresses to IPv6 addresses, so we use the no_inet6
+ function variant. */
+ res_ctx = __resolv_context_get ();
+ res_enable_inet6 = __resolv_context_disable_inet6 (res_ctx);
+ if (res_ctx == NULL)
+ no_more = 1;
while (!no_more)
{
- 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)
+ 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)
{
- if (req->ai_family == AF_INET6
- || req->ai_family == AF_UNSPEC)
+ while (1)
{
- gethosts (AF_INET6, struct in6_addr);
- no_inet6_data = no_data;
- inet6_status = status;
+ status = DL_CALL_FCT (fct4, (name, pat,
+ tmpbuf->data, tmpbuf->length,
+ &errno, &h_errno,
+ NULL));
+ if (status == NSS_STATUS_SUCCESS)
+ break;
+ if (status != NSS_STATUS_TRYAGAIN
+ || errno != ERANGE || h_errno != NETDB_INTERNAL)
+ {
+ if (h_errno == TRY_AGAIN)
+ no_data = EAI_AGAIN;
+ else
+ no_data = h_errno == NO_DATA;
+ break;
+ }
+
+ if (!scratch_buffer_grow (tmpbuf))
+ {
+ __resolv_context_enable_inet6
+ (res_ctx, res_enable_inet6);
+ __resolv_context_put (res_ctx);
+ result = -EAI_MEMORY;
+ goto free_and_return;
+ }
}
- 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)))
+
+ if (status == NSS_STATUS_SUCCESS)
{
- gethosts (AF_INET, struct in_addr);
+ assert (!no_data);
+ no_data = 1;
- if (req->ai_family == AF_INET)
+ if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL)
+ canon = (*pat)->name;
+
+ while (*pat != NULL)
{
- no_inet6_data = no_data;
- inet6_status = status;
+ 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);
}
}
- /* 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)
+ 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_flags & AI_CANONNAME) != 0 && canon == 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)))
{
- /* If we need the canonical name, get it
- from the same service as the result. */
- nss_getcanonname_r cfct;
- int herrno;
+ gethosts (AF_INET, struct in_addr);
- cfct = __nss_lookup_function (nip, "getcanonname_r");
- if (cfct != NULL)
+ if (req->ai_family == AF_INET)
{
- const size_t max_fqdn_len = 256;
- char *buf = alloca (max_fqdn_len);
- char *s;
-
- if (DL_CALL_FCT (cfct, (at->name ?: name, buf,
- max_fqdn_len, &s, &rc,
- &herrno))
- == NSS_STATUS_SUCCESS)
- canon = s;
- else
- /* Set to name now to avoid using
- gethostbyaddr. */
- canon = name;
+ no_inet6_data = no_data;
+ inet6_status = status;
}
}
- break;
+ /* 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)
+ {
+ __resolv_context_enable_inet6
+ (res_ctx, res_enable_inet6);
+ __resolv_context_put (res_ctx);
+ 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
+ {
+ /* Could not locate any of the lookup functions.
+ The NSS lookup code does not consistently set
+ errno, so we need to supply our own error
+ code here. The root cause could either be a
+ resource allocation failure, or a missing
+ service function in the DSO (so it should not
+ be listed in /etc/nsswitch.conf). Assume the
+ former, and return EBUSY. */
+ status = NSS_STATUS_UNAVAIL;
+ __set_h_errno (NETDB_INTERNAL);
+ __set_errno (EBUSY);
}
-
- /* 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;
}
if (nss_next_action (nip, status) == NSS_ACTION_RETURN)
nip = nip->next;
}
- _res.options = old_res_options;
+ __resolv_context_enable_inet6 (res_ctx, res_enable_inet6);
+ __resolv_context_put (res_ctx);
+
+ /* If we have a failure which sets errno, report it using
+ EAI_SYSTEM. */
+ if ((status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL)
+ && 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)
- return -EAI_AGAIN;
+ result = -EAI_AGAIN;
+ else
+ /* We made requests but they turned out no data. The name
+ is known, though. */
+ result = -EAI_NODATA;
- /* We made requests but they turned out no data. The name
- is known, though. */
- return GAIH_OKIFUNSPEC | -EAI_NODATA;
+ goto free_and_return;
}
}
process_list:
if (at->family == AF_UNSPEC)
- return GAIH_OKIFUNSPEC | -EAI_NONAME;
+ {
+ result = -EAI_NONAME;
+ goto free_and_return;
+ }
}
else
{
struct gaih_addrtuple *atr;
- atr = at = __alloca (sizeof (struct gaih_addrtuple));
+ atr = at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used);
memset (at, '\0', sizeof (struct gaih_addrtuple));
if (req->ai_family == AF_UNSPEC)
}
}
- if (pai == NULL)
- return 0;
-
{
struct gaih_servtuple *st2;
struct gaih_addrtuple *at2 = at;
if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0)
{
if (canon == NULL)
- {
- struct hostent *h = NULL;
- int herrno;
- struct hostent th;
- size_t tmpbuflen = 512;
- char *tmpbuf = NULL;
+ /* If the canonical name cannot be determined, use
+ the passed in string. */
+ canon = orig_name;
- do
- {
- tmpbuf = extend_alloca (tmpbuf, tmpbuflen, tmpbuflen * 2);
- rc = __gethostbyaddr_r (at2->addr,
- ((at2->family == AF_INET6)
- ? sizeof (struct in6_addr)
- : sizeof (struct in_addr)),
- at2->family, &th, tmpbuf,
- tmpbuflen, &h, &herrno);
- }
- while (rc == ERANGE && herrno == NETDB_INTERNAL);
-
- if (rc != 0 && herrno == NETDB_INTERNAL)
- {
- __set_h_errno (herrno);
- return -EAI_SYSTEM;
- }
-
- if (h != NULL)
- canon = h->h_name;
+ bool do_idn = req->ai_flags & AI_CANONIDN;
+ if (do_idn)
+ {
+ char *out;
+ int rc = __idna_from_dns_encoding (canon, &out);
+ if (rc == 0)
+ canon = out;
+ else if (rc == EAI_IDN_ENCODE)
+ /* Use the punycode name as a fallback. */
+ do_idn = false;
else
{
- assert (orig_name != NULL);
- /* If the canonical name cannot be determined, use
- the passed in string. */
- canon = orig_name;
+ result = -rc;
+ goto free_and_return;
}
}
-
-#ifdef HAVE_LIBIDN
- if (req->ai_flags & AI_CANONIDN)
+ if (!do_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 *out;
- int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags);
- if (rc != IDNA_SUCCESS)
+ if (canonbuf != NULL)
+ /* We already allocated the string using malloc, but
+ the buffer is now owned by canon. */
+ canonbuf = NULL;
+ else
{
- if (rc == IDNA_MALLOC_ERROR)
- return -EAI_MEMORY;
- if (rc == IDNA_DLOPEN_ERROR)
- return -EAI_SYSTEM;
- return -EAI_IDN_ENCODE;
+ canon = __strdup (canon);
+ if (canon == NULL)
+ {
+ result = -EAI_MEMORY;
+ goto free_and_return;
+ }
}
- /* In case the output string is the same as the input
- string no new string has been allocated. Otherwise
- make a copy. */
- if (out == canon)
- goto make_copy;
- }
- else
-#endif
- {
-#ifdef HAVE_LIBIDN
- make_copy:
-#endif
- canon = strdup (canon);
- if (canon == NULL)
- return -EAI_MEMORY;
}
}
if (ai == NULL)
{
free ((char *) canon);
- return -EAI_MEMORY;
+ result = -EAI_MEMORY;
+ goto free_and_return;
}
ai->ai_flags = req->ai_flags;
at2 = at2->next;
}
}
- return 0;
+
+ free_and_return:
+ if (malloc_name)
+ free ((char *) name);
+ free (addrmem);
+ free (canonbuf);
+
+ return result;
}
struct sort_result
{
struct addrinfo *dest_addr;
- struct sockaddr_storage source_addr;
- size_t service_order;
+ /* 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;
/* Link-local addresses: scope 2. */
{ { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 },
{ { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 },
- /* Site-local addresses: scope 5. */
- { { { 10, 0, 0, 0 } }, htonl_c (0xff000000), 5 },
- { { { 172, 16, 0, 0 } }, htonl_c (0xfff00000), 5 },
- { { { 192, 168, 0, 0 } }, htonl_c (0xffff0000), 5 },
/* Default: scope 14. */
{ { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 }
};
static int
-get_scope (const struct sockaddr_storage *ss)
+get_scope (const struct sockaddr_in6 *in6)
{
int scope;
- if (ss->ss_family == PF_INET6)
+ if (in6->sin6_family == PF_INET6)
{
- const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) ss;
-
if (! IN6_IS_ADDR_MULTICAST (&in6->sin6_addr))
{
- if (IN6_IS_ADDR_LINKLOCAL (&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
scope = in6->sin6_addr.s6_addr[1] & 0xf;
}
- else if (ss->ss_family == PF_INET)
+ else if (in6->sin6_family == PF_INET)
{
- const struct sockaddr_in *in = (const struct sockaddr_in *) ss;
+ const struct sockaddr_in *in = (const struct sockaddr_in *) in6;
size_t cnt = 0;
while (1)
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 },
+ { { .__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
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 },
+ { { .__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 }
+ { { .__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 }
};
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 }
+ { { .__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_storage *ss,
+match_prefix (const struct sockaddr_in6 *in6,
const struct prefixentry *list, int default_val)
{
int idx;
struct sockaddr_in6 in6_mem;
- const struct sockaddr_in6 *in6;
- if (ss->ss_family == PF_INET6)
- in6 = (const struct sockaddr_in6 *) ss;
- else if (ss->ss_family == PF_INET)
+ if (in6->sin6_family == PF_INET)
{
- const struct sockaddr_in *in = (const struct sockaddr_in *) ss;
+ const struct sockaddr_in *in = (const struct sockaddr_in *) in6;
- /* Convert to IPv6 address. */
+ /* 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;
- if (in->sin_addr.s_addr == htonl (0x7f000001))
- in6_mem.sin6_addr = (struct in6_addr) IN6ADDR_LOOPBACK_INIT;
- else
- {
- /* Construct a V4-to-6 mapped address. */
- 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;
- }
+ 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
+ else if (in6->sin6_family != PF_INET6)
return default_val;
for (idx = 0; ; ++idx)
static int
-get_label (const struct sockaddr_storage *ss)
+get_label (const struct sockaddr_in6 *in6)
{
/* XXX What is a good default value? */
- return match_prefix (ss, labels, INT_MAX);
+ return match_prefix (in6, labels, INT_MAX);
}
static int
-get_precedence (const struct sockaddr_storage *ss)
+get_precedence (const struct sockaddr_in6 *in6)
{
/* XXX What is a good default value? */
- return match_prefix (ss, precedence, 0);
+ return match_prefix (in6, precedence, 0);
}
static int
rfc3484_sort (const void *p1, const void *p2, void *arg)
{
- const struct sort_result *a1 = (const struct sort_result *) p1;
- const struct sort_result *a2 = (const struct sort_result *) p2;
+ 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. */
/* Rule 2: Prefer matching scope. Only interesting if both
destination addresses are IPv6. */
int a1_dst_scope
- = get_scope ((struct sockaddr_storage *) a1->dest_addr->ai_addr);
+ = get_scope ((struct sockaddr_in6 *) a1->dest_addr->ai_addr);
int a2_dst_scope
- = get_scope ((struct sockaddr_storage *) a2->dest_addr->ai_addr);
+ = get_scope ((struct sockaddr_in6 *) a2->dest_addr->ai_addr);
if (a1->got_source_addr)
{
if (a1->got_source_addr)
{
int a1_dst_label
- = get_label ((struct sockaddr_storage *) a1->dest_addr->ai_addr);
+ = 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_storage *) a2->dest_addr->ai_addr);
+ = 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)
/* Rule 6: Prefer higher precedence. */
int a1_prec
- = get_precedence ((struct sockaddr_storage *) a1->dest_addr->ai_addr);
+ = get_precedence ((struct sockaddr_in6 *) a1->dest_addr->ai_addr);
int a2_prec
- = get_precedence ((struct sockaddr_storage *) a2->dest_addr->ai_addr);
+ = get_precedence ((struct sockaddr_in6 *) a2->dest_addr->ai_addr);
if (a1_prec > a2_prec)
return -1;
(most?) cases. */
if (a1->index != a2->index)
{
- if (a1->native == -1 || a2->native == -1)
+ int a1_native = a1->native;
+ int a2_native = a2->native;
+
+ if (a1_native == -1 || a2_native == -1)
{
- /* If we do not have the information use 'native' as the
- default. */
- int a1_native = 0;
- int a2_native = 0;
- __check_native (a1->index, &a1_native, a2->index, &a2_native);
+ 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->native == -1 && src->results[i].index == a1->index)
+ 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;
- if (a2->native == -1 && src->results[i].index == a2->index)
+ }
+ 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)
+ if (a1_native && !a2_native)
return -1;
- if (!a1->native && a2->native)
+ if (!a1_native && a2_native)
return 1;
}
}
if (a1->dest_addr->ai_family == PF_INET)
{
- assert (a1->source_addr.ss_family == PF_INET);
- assert (a2->source_addr.ss_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.
}
else if (a1->dest_addr->ai_family == PF_INET6)
{
- assert (a1->source_addr.ss_family == PF_INET6);
- assert (a2->source_addr.ss_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;
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 a1->service_order < a2->service_order ? -1 : 1;
+ return idx1 < idx2 ? -1 : 1;
}
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)
{
size_t nscopelist = 0;
bool scopelist_nullbits = false;
- FILE *fp = fopen (GAICONF_FNAME, "rc");
+ FILE *fp = fopen (GAICONF_FNAME, "rce");
if (fp != NULL)
{
struct stat64 st;
*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
if (oldscope != default_scopes)
free ((void *) oldscope);
- gaiconf_mtime = st.st_mtim;
+ save_gaiconf_mtime (&st);
}
else
{
{
struct stat64 st;
if (__xstat64 (_STAT_VER, GAICONF_FNAME, &st) != 0
- || memcmp (&st.st_mtim, &gaiconf_mtime, sizeof (gaiconf_mtime)) != 0)
+ || !check_gaiconf_mtime (&st))
gaiconf_init ();
}
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_IDN|AI_CANONIDN|DEPRECATED_AI_IDN
|AI_NUMERICSERV|AI_ALL))
return EAI_BADFLAGS;
size_t in6ailen = 0;
bool seen_ipv4 = false;
bool seen_ipv6 = false;
- /* 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);
+ 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)
+ if ((! seen_ipv4 || ! seen_ipv6) && (seen_ipv4 || seen_ipv6))
{
local_hints = *hints;
local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6;
|| (hints->ai_family == PF_INET6 && ! seen_ipv6))
{
/* We cannot possibly return a valid answer. */
- free (in6ai);
+ __free_in6ai (in6ai);
return EAI_NONAME;
}
}
{
if (hints->ai_flags & AI_NUMERICSERV)
{
- free (in6ai);
+ __free_in6ai (in6ai);
return EAI_NONAME;
}
else
pservice = NULL;
- struct addrinfo **end;
- if (pai)
- end = &p;
- else
- end = 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)
{
- last_i = gaih_inet (name, pservice, hints, end, &naddrs);
+ 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);
+ __free_in6ai (in6ai);
- return -(last_i & GAIH_EAI);
+ return -last_i;
+ }
+ while (*end)
+ {
+ end = &((*end)->ai_next);
+ ++nresults;
}
- if (end)
- while (*end)
- {
- end = &((*end)->ai_next);
- ++nresults;
- }
}
else
{
- free (in6ai);
+ __free_in6ai (in6ai);
return EAI_FAMILY;
}
__typeof (once) old_once = once;
__libc_once (once, gaiconf_init);
/* Sort results according to RFC 3484. */
- struct sort_result results[nresults];
+ 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. */
for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next)
{
results[i].dest_addr = q;
- results[i].service_order = i;
results[i].native = -1;
+ order[i] = i;
/* If we just looked up the address for a different
protocol, reuse the result. */
{
if (fd != -1)
close_retry:
- close_not_cancel_no_status (fd);
+ __close_nocancel_nostatus (fd);
af = q->ai_family;
- fd = __socket (af, SOCK_DGRAM, IPPROTO_IP);
+ fd = __socket (af, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP);
}
else
{
tmp.addr[0] = 0;
tmp.addr[1] = 0;
tmp.addr[2] = htonl (0xffff);
- tmp.addr[3] = sinp->sin_addr.s_addr;
+ /* 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
{
}
if (fd != -1)
- close_not_cancel_no_status (fd);
+ __close_nocancel_nostatus (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 (__builtin_expect (gaiconf_reload_flag_ever_set, 0))
+ if (__glibc_unlikely (gaiconf_reload_flag_ever_set))
{
__libc_lock_define_initialized (static, lock);
__libc_lock_lock (lock);
- if (old_once && gaiconf_reload_flag)
+ if (__libc_once_get (old_once) && gaiconf_reload_flag)
gaiconf_reload ();
- qsort_r (results, nresults, sizeof (results[0]), rfc3484_sort, &src);
+ __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src);
__libc_lock_unlock (lock);
}
else
- qsort_r (results, nresults, sizeof (results[0]), rfc3484_sort, &src);
+ __qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src);
/* Queue the results up as they come out of sorting. */
- q = p = results[0].dest_addr;
+ q = p = results[order[0]].dest_addr;
for (i = 1; i < nresults; ++i)
- q = q->ai_next = results[i].dest_addr;
+ 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);
+ __free_in6ai (in6ai);
if (p)
{
return 0;
}
- if (pai == NULL && last_i == 0)
- return 0;
-
- return last_i ? -(last_i & GAIH_EAI) : EAI_NONAME;
+ return last_i ? -last_i : EAI_NONAME;
}
libc_hidden_def (getaddrinfo)
-static_link_warning (getaddrinfo)
+nss_interface_function (getaddrinfo)
void
freeaddrinfo (struct addrinfo *ai)
projects / thirdparty / glibc.git / blobdiff