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https://sourceware.org/git/glibc.git
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gaih_inet: separate nss lookup loop into its own function
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Siddhesh Poyarekar
parent
e7e5315b7f
commit
906cecbe08
@ -159,6 +159,14 @@ static const struct addrinfo default_hints =
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.ai_next = NULL
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};
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static void
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gaih_result_reset (struct gaih_result *res)
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{
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if (res->free_at)
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free (res->at);
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free (res->canon);
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memset (res, 0, sizeof (*res));
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}
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static int
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gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
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@ -197,13 +205,10 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
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/* Convert struct hostent to a list of struct gaih_addrtuple objects. h_name
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is not copied, and the struct hostent object must not be deallocated
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prematurely. The new addresses are appended to the tuple array in
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RESULT. */
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prematurely. The new addresses are appended to the tuple array in RES. */
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static bool
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convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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int family,
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struct hostent *h,
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struct gaih_addrtuple **result)
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convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
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struct hostent *h, struct gaih_result *res)
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{
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/* Count the number of addresses in h->h_addr_list. */
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size_t count = 0;
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@ -215,7 +220,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr))
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return true;
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struct gaih_addrtuple *array = *result;
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struct gaih_addrtuple *array = res->at;
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size_t old = 0;
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while (array != NULL)
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@ -224,12 +229,14 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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array = array->next;
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}
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array = realloc (*result, (old + count) * sizeof (*array));
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array = realloc (res->at, (old + count) * sizeof (*array));
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if (array == NULL)
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return false;
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*result = array;
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res->got_ipv6 = family == AF_INET6;
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res->at = array;
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res->free_at = true;
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/* Update the next pointers on reallocation. */
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for (size_t i = 0; i < old; i++)
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@ -278,7 +285,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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{ \
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__resolv_context_put (res_ctx); \
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result = -EAI_MEMORY; \
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goto free_and_return; \
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goto out; \
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} \
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} \
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if (status == NSS_STATUS_NOTFOUND \
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@ -288,7 +295,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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{ \
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__resolv_context_put (res_ctx); \
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result = -EAI_SYSTEM; \
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goto free_and_return; \
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goto out; \
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} \
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if (h_errno == TRY_AGAIN) \
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no_data = EAI_AGAIN; \
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@ -297,27 +304,24 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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} \
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else if (status == NSS_STATUS_SUCCESS) \
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{ \
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if (!convert_hostent_to_gaih_addrtuple (req, _family, &th, &addrmem)) \
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if (!convert_hostent_to_gaih_addrtuple (req, _family, &th, res)) \
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{ \
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__resolv_context_put (res_ctx); \
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result = -EAI_SYSTEM; \
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goto free_and_return; \
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goto out; \
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} \
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*pat = addrmem; \
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\
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if (localcanon != NULL && res.canon == NULL) \
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if (localcanon != NULL && res->canon == NULL) \
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{ \
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char *canonbuf = __strdup (localcanon); \
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if (canonbuf == NULL) \
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{ \
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__resolv_context_put (res_ctx); \
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result = -EAI_SYSTEM; \
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goto free_and_return; \
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goto out; \
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} \
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res.canon = canonbuf; \
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res->canon = canonbuf; \
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} \
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if (_family == AF_INET6 && *pat != NULL) \
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res.got_ipv6 = true; \
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} \
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}
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@ -590,6 +594,260 @@ out:
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}
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#endif
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static int
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get_nss_addresses (const char *name, const struct addrinfo *req,
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struct scratch_buffer *tmpbuf, struct gaih_result *res)
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{
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int no_data = 0;
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int no_inet6_data = 0;
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nss_action_list nip;
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enum nss_status inet6_status = NSS_STATUS_UNAVAIL;
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enum nss_status status = NSS_STATUS_UNAVAIL;
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int no_more;
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struct resolv_context *res_ctx = NULL;
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bool do_merge = false;
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int result = 0;
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no_more = !__nss_database_get (nss_database_hosts, &nip);
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/* If we are looking for both IPv4 and IPv6 address we don't
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want the lookup functions to automatically promote IPv4
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addresses to IPv6 addresses, so we use the no_inet6
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function variant. */
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res_ctx = __resolv_context_get ();
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if (res_ctx == NULL)
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no_more = 1;
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while (!no_more)
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{
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/* Always start afresh; continue should discard previous results
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and the hosts database does not support merge. */
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gaih_result_reset (res);
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if (do_merge)
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{
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__set_h_errno (NETDB_INTERNAL);
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__set_errno (EBUSY);
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break;
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}
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no_data = 0;
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nss_gethostbyname4_r *fct4 = NULL;
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/* gethostbyname4_r sends out parallel A and AAAA queries and
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is thus only suitable for PF_UNSPEC. */
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if (req->ai_family == PF_UNSPEC)
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fct4 = __nss_lookup_function (nip, "gethostbyname4_r");
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if (fct4 != NULL)
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{
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while (1)
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{
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status = DL_CALL_FCT (fct4, (name, &res->at,
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tmpbuf->data, tmpbuf->length,
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&errno, &h_errno,
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NULL));
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if (status == NSS_STATUS_SUCCESS)
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break;
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/* gethostbyname4_r may write into AT, so reset it. */
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res->at = NULL;
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if (status != NSS_STATUS_TRYAGAIN
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|| errno != ERANGE || h_errno != NETDB_INTERNAL)
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{
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if (h_errno == TRY_AGAIN)
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no_data = EAI_AGAIN;
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else
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no_data = h_errno == NO_DATA;
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break;
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}
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if (!scratch_buffer_grow (tmpbuf))
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{
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__resolv_context_put (res_ctx);
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result = -EAI_MEMORY;
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goto out;
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}
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}
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if (status == NSS_STATUS_SUCCESS)
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{
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assert (!no_data);
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no_data = 1;
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if ((req->ai_flags & AI_CANONNAME) != 0 && res->canon == NULL)
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{
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char *canonbuf = __strdup (res->at->name);
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if (canonbuf == NULL)
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{
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__resolv_context_put (res_ctx);
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result = -EAI_MEMORY;
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goto out;
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}
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res->canon = canonbuf;
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}
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struct gaih_addrtuple **pat = &res->at;
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while (*pat != NULL)
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{
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if ((*pat)->family == AF_INET
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&& req->ai_family == AF_INET6
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&& (req->ai_flags & AI_V4MAPPED) != 0)
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{
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uint32_t *pataddr = (*pat)->addr;
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(*pat)->family = AF_INET6;
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pataddr[3] = pataddr[0];
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pataddr[2] = htonl (0xffff);
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pataddr[1] = 0;
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pataddr[0] = 0;
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pat = &((*pat)->next);
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no_data = 0;
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}
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else if (req->ai_family == AF_UNSPEC
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|| (*pat)->family == req->ai_family)
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{
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pat = &((*pat)->next);
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no_data = 0;
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if (req->ai_family == AF_INET6)
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res->got_ipv6 = true;
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}
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else
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*pat = ((*pat)->next);
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}
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}
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no_inet6_data = no_data;
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}
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else
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{
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nss_gethostbyname3_r *fct = NULL;
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if (req->ai_flags & AI_CANONNAME)
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/* No need to use this function if we do not look for
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the canonical name. The function does not exist in
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all NSS modules and therefore the lookup would
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often fail. */
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fct = __nss_lookup_function (nip, "gethostbyname3_r");
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if (fct == NULL)
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/* We are cheating here. The gethostbyname2_r
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function does not have the same interface as
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gethostbyname3_r but the extra arguments the
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latter takes are added at the end. So the
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gethostbyname2_r code will just ignore them. */
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fct = __nss_lookup_function (nip, "gethostbyname2_r");
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if (fct != NULL)
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{
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if (req->ai_family == AF_INET6
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|| req->ai_family == AF_UNSPEC)
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{
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gethosts (AF_INET6);
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no_inet6_data = no_data;
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inet6_status = status;
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}
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if (req->ai_family == AF_INET
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|| req->ai_family == AF_UNSPEC
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|| (req->ai_family == AF_INET6
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&& (req->ai_flags & AI_V4MAPPED)
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/* Avoid generating the mapped addresses if we
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know we are not going to need them. */
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&& ((req->ai_flags & AI_ALL) || !res->got_ipv6)))
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{
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gethosts (AF_INET);
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if (req->ai_family == AF_INET)
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{
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no_inet6_data = no_data;
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inet6_status = status;
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}
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}
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/* If we found one address for AF_INET or AF_INET6,
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don't continue the search. */
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if (inet6_status == NSS_STATUS_SUCCESS
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|| status == NSS_STATUS_SUCCESS)
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{
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if ((req->ai_flags & AI_CANONNAME) != 0
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&& res->canon == NULL)
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{
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char *canonbuf = getcanonname (nip, res->at, name);
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if (canonbuf == NULL)
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{
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__resolv_context_put (res_ctx);
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result = -EAI_MEMORY;
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goto out;
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}
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res->canon = canonbuf;
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}
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status = NSS_STATUS_SUCCESS;
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}
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else
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{
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/* We can have different states for AF_INET and
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AF_INET6. Try to find a useful one for both. */
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if (inet6_status == NSS_STATUS_TRYAGAIN)
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status = NSS_STATUS_TRYAGAIN;
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else if (status == NSS_STATUS_UNAVAIL
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&& inet6_status != NSS_STATUS_UNAVAIL)
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status = inet6_status;
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}
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}
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else
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{
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/* Could not locate any of the lookup functions.
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The NSS lookup code does not consistently set
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errno, so we need to supply our own error
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code here. The root cause could either be a
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resource allocation failure, or a missing
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service function in the DSO (so it should not
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be listed in /etc/nsswitch.conf). Assume the
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former, and return EBUSY. */
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status = NSS_STATUS_UNAVAIL;
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__set_h_errno (NETDB_INTERNAL);
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__set_errno (EBUSY);
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}
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}
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if (nss_next_action (nip, status) == NSS_ACTION_RETURN)
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break;
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/* The hosts database does not support MERGE. */
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if (nss_next_action (nip, status) == NSS_ACTION_MERGE)
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do_merge = true;
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nip++;
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if (nip->module == NULL)
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no_more = -1;
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}
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__resolv_context_put (res_ctx);
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/* If we have a failure which sets errno, report it using
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EAI_SYSTEM. */
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if ((status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL)
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&& h_errno == NETDB_INTERNAL)
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{
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result = -EAI_SYSTEM;
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goto out;
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}
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if (no_data != 0 && no_inet6_data != 0)
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{
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/* If both requests timed out report this. */
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if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN)
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result = -EAI_AGAIN;
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else
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/* We made requests but they turned out no data. The name
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is known, though. */
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result = -EAI_NODATA;
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}
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out:
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if (result != 0)
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gaih_result_reset (res);
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return result;
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}
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/* Convert numeric addresses to binary into RES. On failure, RES->AT is set to
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NULL and an error code is returned. If AI_NUMERIC_HOST is not requested and
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the function cannot determine a result, RES->AT is set to NULL and 0
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@ -723,7 +981,7 @@ try_simple_gethostbyname (const char *name, const struct addrinfo *req,
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/* We found data, convert it. RES->AT from the conversion will
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either be an allocated block or NULL, both of which are safe to
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pass to free (). */
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if (!convert_hostent_to_gaih_addrtuple (req, AF_INET, h, &res->at))
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if (!convert_hostent_to_gaih_addrtuple (req, AF_INET, h, res))
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return -EAI_MEMORY;
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res->free_at = true;
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@ -801,264 +1059,14 @@ gaih_inet (const char *name, const struct gaih_service *service,
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goto process_list;
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#endif
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int no_data = 0;
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int no_inet6_data = 0;
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nss_action_list nip;
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enum nss_status inet6_status = NSS_STATUS_UNAVAIL;
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enum nss_status status = NSS_STATUS_UNAVAIL;
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int no_more;
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struct resolv_context *res_ctx = NULL;
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bool do_merge = false;
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if ((result = get_nss_addresses (name, req, tmpbuf, &res)) != 0)
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goto free_and_return;
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else if (res.at != NULL)
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goto process_list;
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no_more = !__nss_database_get (nss_database_hosts, &nip);
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/* If we are looking for both IPv4 and IPv6 address we don't
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want the lookup functions to automatically promote IPv4
|
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addresses to IPv6 addresses, so we use the no_inet6
|
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function variant. */
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res_ctx = __resolv_context_get ();
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if (res_ctx == NULL)
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no_more = 1;
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while (!no_more)
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{
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/* Always start afresh; continue should discard previous results
|
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and the hosts database does not support merge. */
|
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res.at = NULL;
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free (res.canon);
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free (addrmem);
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res.canon = NULL;
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addrmem = NULL;
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got_ipv6 = false;
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if (do_merge)
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{
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__set_h_errno (NETDB_INTERNAL);
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__set_errno (EBUSY);
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break;
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}
|
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no_data = 0;
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nss_gethostbyname4_r *fct4 = NULL;
|
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|
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/* gethostbyname4_r sends out parallel A and AAAA queries and
|
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is thus only suitable for PF_UNSPEC. */
|
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if (req->ai_family == PF_UNSPEC)
|
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fct4 = __nss_lookup_function (nip, "gethostbyname4_r");
|
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|
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if (fct4 != NULL)
|
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{
|
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while (1)
|
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{
|
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status = DL_CALL_FCT (fct4, (name, &res.at,
|
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tmpbuf->data, tmpbuf->length,
|
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&errno, &h_errno,
|
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NULL));
|
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if (status == NSS_STATUS_SUCCESS)
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break;
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/* gethostbyname4_r may write into AT, so reset it. */
|
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res.at = NULL;
|
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if (status != NSS_STATUS_TRYAGAIN
|
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|| errno != ERANGE || h_errno != NETDB_INTERNAL)
|
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{
|
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if (h_errno == TRY_AGAIN)
|
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no_data = EAI_AGAIN;
|
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else
|
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no_data = h_errno == NO_DATA;
|
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break;
|
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}
|
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|
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if (!scratch_buffer_grow (tmpbuf))
|
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{
|
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__resolv_context_put (res_ctx);
|
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result = -EAI_MEMORY;
|
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goto free_and_return;
|
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}
|
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}
|
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|
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if (status == NSS_STATUS_SUCCESS)
|
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{
|
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assert (!no_data);
|
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no_data = 1;
|
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|
||||
if ((req->ai_flags & AI_CANONNAME) != 0 && res.canon == NULL)
|
||||
{
|
||||
char *canonbuf = __strdup (res.at->name);
|
||||
if (canonbuf == NULL)
|
||||
{
|
||||
__resolv_context_put (res_ctx);
|
||||
result = -EAI_MEMORY;
|
||||
goto free_and_return;
|
||||
}
|
||||
res.canon = canonbuf;
|
||||
}
|
||||
|
||||
struct gaih_addrtuple **pat = &res.at;
|
||||
|
||||
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)
|
||||
res.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)
|
||||
{
|
||||
struct gaih_addrtuple **pat = &res.at;
|
||||
|
||||
if (req->ai_family == AF_INET6
|
||||
|| req->ai_family == AF_UNSPEC)
|
||||
{
|
||||
gethosts (AF_INET6);
|
||||
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) || !res.got_ipv6)))
|
||||
{
|
||||
gethosts (AF_INET);
|
||||
|
||||
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
|
||||
&& res.canon == NULL)
|
||||
{
|
||||
char *canonbuf = getcanonname (nip, res.at, name);
|
||||
if (canonbuf == NULL)
|
||||
{
|
||||
__resolv_context_put (res_ctx);
|
||||
result = -EAI_MEMORY;
|
||||
goto free_and_return;
|
||||
}
|
||||
res.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);
|
||||
}
|
||||
}
|
||||
|
||||
if (nss_next_action (nip, status) == NSS_ACTION_RETURN)
|
||||
break;
|
||||
|
||||
/* The hosts database does not support MERGE. */
|
||||
if (nss_next_action (nip, status) == NSS_ACTION_MERGE)
|
||||
do_merge = true;
|
||||
|
||||
nip++;
|
||||
if (nip->module == NULL)
|
||||
no_more = -1;
|
||||
}
|
||||
|
||||
__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)
|
||||
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 (res.at == NULL)
|
||||
{
|
||||
result = -EAI_NONAME;
|
||||
goto free_and_return;
|
||||
}
|
||||
/* None of the lookups worked, so name not found. */
|
||||
result = -EAI_NONAME;
|
||||
goto free_and_return;
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -1089,6 +1097,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
|
||||
}
|
||||
}
|
||||
|
||||
process_list:
|
||||
{
|
||||
/* Set up the canonical name if we need it. */
|
||||
if ((result = process_canonname (req, orig_name, &res)) != 0)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user