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authorUlrich Drepper <drepper@redhat.com>1999-08-25 17:19:50 +0000
committerUlrich Drepper <drepper@redhat.com>1999-08-25 17:19:50 +0000
commit71d3bda9a7a15bf3f935ffcde8aeceefef8074f7 (patch)
tree3188ef1b1ad5a60d512813dadfc756225dda0ff4 /inet
parentad65970214c9dfaa6b61b9519cb0667b376e14d9 (diff)
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Update.
1999-08-25 Ulrich Drepper <drepper@cygnus.com> * inet/Makefile (routines): Add getipnodebynm. * inet/getipnodebynm.c: New file. * nss/digits_dots.c: If HAVE_TYPE is define type contains the interface type. * nss/nss_files/files-XXX.c: Define EXTRA_ARGS, EXTRA_ARGS_DECL, and EXTRA_ARGS_VALUE is not already done. (internal_getent): Allow extra parameters and pass them to parse_line. (_nss_files_get,ENTNAME_r): Pass extra parameters to internal_getent. (_nss_files_get##name##_r): Likewise. * nss/nss_files/files-hosts.c: Define EXTRA_ARGS, EXTRA_ARGS_DECL, and EXTRA_ARGS_VALUE to pass flags and type to parser. Add getipnodebyname function. * nss/nss_files/files-parse.c: Define EXTRA_ARGS, EXTRA_ARGS_DECL, and EXTRA_ARGS_VALUE is not already done. (parse_line): Add EXTRA_ARGS_DECL to parameter list. * nss/nss_db/db-XXX.c (lookup): Allow extra parameters and pass them to parse_line. (_nss_db_get##name##_r): Pass extra parameters to lookup. (_nss_db_get,ENTNAME_r): Likewise. * sysdeps/generic/if_index.c (__protocol_available): New function. * sysdeps/unix/sysv/linux/if_index.c: Likewise.
Diffstat (limited to 'inet')
-rw-r--r--inet/Makefile3
-rw-r--r--inet/getipnodebynm.c194
2 files changed, 196 insertions, 1 deletions
diff --git a/inet/Makefile b/inet/Makefile
index aabe332793..52757ce87d 100644
--- a/inet/Makefile
+++ b/inet/Makefile
@@ -45,7 +45,8 @@ routines := htonl htons \
rcmd rexec ruserpass \
getnetgrent_r getnetgrent \
getaliasent_r getaliasent getaliasname getaliasname_r \
- in6_addr getnameinfo if_index getipnodebyad freehostent
+ in6_addr getnameinfo if_index getipnodebyad freehostent \
+ getipnodebynm
tests := htontest test_ifindex tst-ntoa tst-ether_aton tst-ipnode
diff --git a/inet/getipnodebynm.c b/inet/getipnodebynm.c
new file mode 100644
index 0000000000..b0be882afb
--- /dev/null
+++ b/inet/getipnodebynm.c
@@ -0,0 +1,194 @@
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+#include "nsswitch.h"
+
+
+/* We avoid using a too large buffer in case the user is accumulating the
+ results and there is lots of unused space in the allocated buffer. */
+#define BUFLEN 512
+
+
+/* Internal function to test whether IPv4 and/or IPv6 are available. */
+extern void __protocol_available (int *have_inet, int *have_inet6)
+ internal_function;
+
+
+/* Type of the lookup function we need here. */
+typedef enum nss_status (*lookup_function) (const char *, int, int,
+ struct hostent *, char *,
+ size_t, int *, int *);
+
+/* The lookup function for the first entry of this service. */
+extern int __nss_hosts_lookup (service_user **nip, const char *name,
+ void **fctp);
+
+
+struct hostent *
+getipnodebyname (const char *name, int type, int flags, int *h_errnop)
+{
+ static service_user *startp;
+ static lookup_function start_fct;
+ service_user *nip;
+ lookup_function fct;
+ int no_more;
+ size_t buffer_size;
+ char *buffer;
+ struct hostent *result;
+ int save;
+ int have_inet = 1;
+ int have_inet6 = 1;
+
+ /* First determine whether we have the appropriate interfaces.
+ XXX I don't think we can cache the result since the system
+ can be reconfigured. */
+ if ((flags & AI_ADDRCONFIG) != 0)
+ __protocol_available (&have_inet, &have_inet6);
+
+ /* Handle impossible requests first. */
+ if ((type == AF_INET && have_inet == 0)
+ || (type == AF_INET6 && have_inet6 == 0 && ((flags & AI_V4MAPPED) == 0
+ || have_inet == 0))
+ || (type != AF_INET && type != AF_INET6))
+ {
+ *h_errnop = NO_DATA;
+ return NULL;
+ }
+
+ buffer_size = BUFLEN;
+ buffer = (char *) malloc (buffer_size);
+
+ result = NULL;
+ if (buffer != NULL)
+ {
+#define HAVE_TYPE
+#define resbuf (*((struct hostent *) buffer))
+#include "../nss/digits_dots.c"
+ }
+
+ if (startp == NULL)
+ {
+ no_more = __nss_hosts_lookup (&nip, "getipnodebyname_r", (void **) &fct);
+ if (no_more)
+ startp = (service_user *) -1l;
+ else
+ {
+ startp = nip;
+ start_fct = fct;
+ }
+ }
+ else
+ {
+ fct = start_fct;
+ no_more = (nip = startp) == (service_user *) -1l;
+ }
+
+ /* First do a lookup with the original protocol type. */
+ while (no_more == 0 && buffer != NULL)
+ {
+ enum nss_status status;
+
+ status = DL_CALL_FCT (fct, (name, type,
+ ((flags & AI_ALL)
+ ? flags : (flags & ~AI_V4MAPPED)),
+ (struct hostent *) buffer,
+ (char *) ((struct hostent *) buffer + 1),
+ buffer_size - sizeof (struct hostent),
+ &errno, h_errnop));
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ result = (struct hostent *) buffer;
+ break;
+ }
+
+ if (status == NSS_STATUS_TRYAGAIN && *h_errnop == NETDB_INTERNAL
+ && errno == ERANGE)
+ {
+ /* Resize the buffer, it's too small. */
+ buffer_size += BUFLEN;
+ buffer = (char *) realloc (buffer, buffer_size);
+ continue;
+ }
+
+ no_more = __nss_next (&nip, "getipnodebyname_r",
+ (void **) &fct, status, 0);
+ }
+
+ /* If we are looking for an IPv6 address but haven't found any and
+ do not have the AI_ALL but the AI_V4MAPPED flag set, now try
+ looking up an IPv4 address and map it. */
+ if (buffer != NULL && result == NULL
+ && type == AF_INET6 && (flags & AI_V4MAPPED) != 0
+ && (no_more = (nip = startp) == (service_user *) -1l) == 0)
+ {
+ /* We have to use a new buffer if there is already a result. */
+ fct = start_fct;
+
+ do
+ {
+ enum nss_status status;
+
+ status = DL_CALL_FCT (fct, (name, type, flags,
+ (struct hostent *) buffer,
+ (char *) ((struct hostent *) buffer + 1),
+ buffer_size - sizeof (struct hostent),
+ &errno, h_errnop));
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ result = (struct hostent *) buffer;
+ break;
+ }
+
+ if (status == NSS_STATUS_TRYAGAIN && *h_errnop == NETDB_INTERNAL
+ && errno == ERANGE)
+ {
+ /* Resize the buffer, it's too small. */
+ buffer_size += BUFLEN;
+ buffer = (char *) realloc (buffer, buffer_size);
+ continue;
+ }
+
+ no_more = __nss_next (&nip, "getipnodebyname_r",
+ (void **) &fct, status, 0);
+ }
+ while (no_more == 0 && buffer != NULL);
+ }
+
+ done:
+ if (buffer == NULL)
+ {
+ /* We are out of memory. */
+ *h_errnop = TRY_AGAIN;
+ assert (result == NULL);
+ }
+ else if (result == NULL && buffer != NULL)
+ free (buffer);
+
+ return result;
+}