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Diffstat (limited to 'sysdeps/posix/getaddrinfo.c')
-rw-r--r--sysdeps/posix/getaddrinfo.c304
1 files changed, 212 insertions, 92 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index e016876b6c..819a85d9ef 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -37,6 +37,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <assert.h>
#include <errno.h>
+#include <ifaddrs.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
@@ -111,12 +112,17 @@ struct gaih
const struct addrinfo *req, struct addrinfo **pai);
};
-#if PF_UNSPEC == 0
-static const struct addrinfo default_hints;
-#else
static const struct addrinfo default_hints =
- { 0, PF_UNSPEC, 0, 0, 0, NULL, NULL, NULL };
-#endif
+ {
+ .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
+ };
#if 0
@@ -265,93 +271,137 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
return 0;
}
-#define gethosts(_family, _type) \
- { \
- int i, herrno; \
- size_t tmpbuflen; \
- struct hostent th; \
- char *tmpbuf = NULL; \
- tmpbuflen = 512; \
- no_data = 0; \
- do { \
- tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
- rc = __gethostbyname2_r (name, _family, &th, tmpbuf, \
- tmpbuflen, &h, &herrno); \
- } while (rc == ERANGE && herrno == NETDB_INTERNAL); \
- if (rc != 0) \
- { \
- if (herrno == NETDB_INTERNAL) \
- { \
- __set_h_errno (herrno); \
- return -EAI_SYSTEM; \
- } \
- if (herrno == TRY_AGAIN) \
- no_data = EAI_AGAIN; \
- else \
- no_data = herrno == NO_DATA; \
- } \
- else if (h != NULL) \
- { \
- for (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 = _family; \
- memcpy ((*pat)->addr, h->h_addr_list[i], \
- sizeof(_type)); \
- pat = &((*pat)->next); \
- } \
- } \
+#define gethosts(_family, _type) \
+ { \
+ int i, herrno; \
+ size_t tmpbuflen; \
+ struct hostent th; \
+ char *tmpbuf = NULL; \
+ tmpbuflen = 512; \
+ no_data = 0; \
+ do { \
+ tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
+ rc = __gethostbyname2_r (name, _family, &th, tmpbuf, \
+ tmpbuflen, &h, &herrno); \
+ } while (rc == ERANGE && herrno == NETDB_INTERNAL); \
+ if (rc != 0) \
+ { \
+ if (herrno == NETDB_INTERNAL) \
+ { \
+ __set_h_errno (herrno); \
+ return -EAI_SYSTEM; \
+ } \
+ if (herrno == TRY_AGAIN) \
+ no_data = EAI_AGAIN; \
+ else \
+ no_data = herrno == NO_DATA; \
+ } \
+ else if (h != NULL) \
+ { \
+ for (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 = _family; \
+ memcpy ((*pat)->addr, h->h_addr_list[i], \
+ sizeof(_type)); \
+ pat = &((*pat)->next); \
+ } \
+ if (_family == AF_INET6) \
+ got_ipv6 = true; \
+ } \
+ else if (_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED)) \
+ { \
+ /* We have to add V4 mapped addresses. Maybe we discard them \
+ later again but we get them anyhow for now. */ \
+ while ((rc = __gethostbyname2_r (name, AF_INET6, &th, tmpbuf, \
+ tmpbuflen, &h, &herrno)) == ERANGE \
+ && herrno == NETDB_INTERNAL) \
+ tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
+ \
+ if (rc != 0) \
+ { \
+ if (herrno == NETDB_INTERNAL) \
+ { \
+ __set_h_errno (herrno); \
+ return -EAI_SYSTEM; \
+ } \
+ if (herrno == TRY_AGAIN) \
+ no_data = EAI_AGAIN; \
+ else \
+ no_data = herrno == NO_DATA; \
+ } \
+ else if (h != NULL) \
+ { \
+ for (i = 0; h->h_addr_list[i]; ++i) \
+ { \
+ if (*pat == NULL) \
+ { \
+ *pat = __alloca (sizeof (struct gaih_addrtuple)); \
+ (*pat)->scopeid = 0; \
+ } \
+ uint32_t *addr = (uint32_t *) (*pat)->addr; \
+ (*pat)->next = NULL; \
+ (*pat)->family = _family; \
+ addr[3] = *(uint32_t *) h->h_addr_list[i]; \
+ addr[2] = htonl (0xffff); \
+ addr[1] = 0; \
+ addr[0] = 0; \
+ pat = &((*pat)->next); \
+ } \
+ } \
+ } \
}
-#define gethosts2(_family, _type) \
- { \
- int i, herrno; \
- size_t tmpbuflen; \
- struct hostent th; \
- char *tmpbuf = NULL; \
- tmpbuflen = 512; \
- no_data = 0; \
- do { \
- tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
- rc = 0; \
- status = DL_CALL_FCT (fct, (name, _family, &th, tmpbuf, \
- tmpbuflen, &rc, &herrno)); \
- } while (rc == ERANGE && herrno == NETDB_INTERNAL); \
- if (status == NSS_STATUS_SUCCESS && rc == 0) \
- h = &th; \
- else \
- h = NULL; \
- if (rc != 0) \
- { \
- if (herrno == NETDB_INTERNAL) \
- { \
- __set_h_errno (herrno); \
- return -EAI_SYSTEM; \
- } \
- if (herrno == TRY_AGAIN) \
- no_data = EAI_AGAIN; \
- else \
- no_data = herrno == NO_DATA; \
- } \
- else if (h != NULL) \
- { \
- for (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 = _family; \
- memcpy ((*pat)->addr, h->h_addr_list[i], \
- sizeof(_type)); \
- pat = &((*pat)->next); \
- } \
- } \
+
+#define gethosts2(_family, _type) \
+ { \
+ int i, herrno; \
+ size_t tmpbuflen; \
+ struct hostent th; \
+ char *tmpbuf = NULL; \
+ tmpbuflen = 512; \
+ no_data = 0; \
+ do { \
+ tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \
+ rc = 0; \
+ status = DL_CALL_FCT (fct, (name, _family, &th, tmpbuf, \
+ tmpbuflen, &rc, &herrno)); \
+ } while (rc == ERANGE && herrno == NETDB_INTERNAL); \
+ if (status == NSS_STATUS_SUCCESS && rc == 0) \
+ h = &th; \
+ else \
+ h = NULL; \
+ if (rc != 0) \
+ { \
+ if (herrno == NETDB_INTERNAL) \
+ { \
+ __set_h_errno (herrno); \
+ return -EAI_SYSTEM; \
+ } \
+ if (herrno == TRY_AGAIN) \
+ no_data = EAI_AGAIN; \
+ else \
+ no_data = herrno == NO_DATA; \
+ } \
+ else if (h != NULL) \
+ { \
+ for (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 = _family; \
+ memcpy ((*pat)->addr, h->h_addr_list[i], \
+ sizeof(_type)); \
+ pat = &((*pat)->next); \
+ } \
+ } \
}
typedef enum nss_status (*nss_gethostbyname2_r)
@@ -368,6 +418,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
struct gaih_addrtuple *at = NULL;
int rc;
+ bool got_ipv6 = false;
if (req->ai_protocol || req->ai_socktype)
{
@@ -490,6 +541,13 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
at->family = AF_INET;
+ else if (req->ai_flags & AI_V4MAPPED)
+ {
+ ((uint32_t *) at->addr)[3] = *(uint32_t *) at->addr;
+ ((uint32_t *) at->addr)[2] = htonl (0xffff);
+ ((uint32_t *) at->addr)[1] = 0;
+ ((uint32_t *) at->addr)[0] = 0;
+ }
else
return -EAI_ADDRFAMILY;
}
@@ -507,6 +565,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
at->family = AF_INET6;
+ else if (IN6_IS_ADDR_V4MAPPED (at->addr))
+ *(uint32_t *) at->addr = ((uint32_t *) at->addr)[3];
else
return -EAI_ADDRFAMILY;
@@ -747,6 +807,14 @@ gaih_inet (const char *name, const struct gaih_service *service,
{
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
{
@@ -765,7 +833,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
(*pai)->ai_socktype = st2->socktype;
(*pai)->ai_protocol = st2->protocol;
(*pai)->ai_addrlen = socklen;
- (*pai)->ai_addr = (void *) (*pai) + sizeof(struct addrinfo);
+ (*pai)->ai_addr = (void *) (*pai) + sizeof (struct addrinfo);
#if SALEN
(*pai)->ai_addr->sa_len = socklen;
#endif /* SALEN */
@@ -805,6 +873,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
pai = &((*pai)->ai_next);
}
+ ignore:
at2 = at2->next;
}
}
@@ -829,6 +898,7 @@ getaddrinfo (const char *name, const char *service,
struct addrinfo *p = NULL, **end;
struct gaih *g = gaih, *pg = NULL;
struct gaih_service gaih_service, *pservice;
+ struct addrinfo local_hints;
if (name != NULL && name[0] == '*' && name[1] == 0)
name = NULL;
@@ -842,12 +912,62 @@ getaddrinfo (const char *name, const char *service,
if (hints == NULL)
hints = &default_hints;
- if (hints->ai_flags & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST))
+ if (hints->ai_flags
+ & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED
+ |AI_ALL))
return EAI_BADFLAGS;
if ((hints->ai_flags & AI_CANONNAME) && name == NULL)
return EAI_BADFLAGS;
+ if (hints->ai_flags & AI_ADDRCONFIG)
+ {
+ /* Determine whether we have IPv4 or IPv6 interfaces or both.
+ We cannot cache the results since new interfaces could be
+ added at any time.
+
+ XXX We are using getifaddrs here which is more costly than
+ it is really necessary. Once things are stable we will have
+ a special function which performs the task with less overhead. */
+ struct ifaddrs* ifa = NULL;
+
+ if (getifaddrs (&ifa) != 0)
+ /* Cannot get the interface list, very bad. */
+ return EAI_SYSTEM;
+
+ bool seen_ipv4 = false;
+ bool seen_ipv6 = false;
+
+ while (ifa != NULL)
+ {
+ if (ifa->ifa_addr->sa_family == PF_INET)
+ seen_ipv4 = true;
+ else if (ifa->ifa_addr->sa_family == PF_INET6)
+ seen_ipv6 = true;
+
+ ifa = ifa->ifa_next;
+ }
+
+ (void) freeifaddrs (ifa);
+
+ /* Now make a decision on what we return, if anything. */
+ if (hints->ai_family == PF_UNSPEC)
+ {
+ /* If we haven't seen both IPv4 and IPv6 interfaces we can
+ narrow down the search. */
+ if (! 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. */
+ return EAI_NONAME;
+ }
+
if (service && service[0])
{
char *c;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 10:09:20 +0000