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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.cvs/glibc-2-2-branch
Ulrich Drepper
27 years ago
11 changed files with 381 additions and 36 deletions
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/* Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library. |
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. |
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The GNU C Library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public License as |
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published by the Free Software Foundation; either version 2 of the |
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License, or (at your option) any later version. |
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The GNU C Library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public |
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License along with the GNU C Library; see the file COPYING.LIB. If not, |
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. */ |
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#include <assert.h> |
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#include <ctype.h> |
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#include <errno.h> |
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#include <netdb.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <arpa/inet.h> |
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#include "nsswitch.h" |
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/* We avoid using a too large buffer in case the user is accumulating the
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results and there is lots of unused space in the allocated buffer. */ |
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#define BUFLEN 512 |
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/* Internal function to test whether IPv4 and/or IPv6 are available. */ |
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extern void __protocol_available (int *have_inet, int *have_inet6) |
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internal_function; |
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/* Type of the lookup function we need here. */ |
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typedef enum nss_status (*lookup_function) (const char *, int, int, |
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struct hostent *, char *, |
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size_t, int *, int *); |
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/* The lookup function for the first entry of this service. */ |
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extern int __nss_hosts_lookup (service_user **nip, const char *name, |
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void **fctp); |
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struct hostent * |
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getipnodebyname (const char *name, int type, int flags, int *h_errnop) |
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{ |
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static service_user *startp; |
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static lookup_function start_fct; |
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service_user *nip; |
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lookup_function fct; |
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int no_more; |
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size_t buffer_size; |
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char *buffer; |
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struct hostent *result; |
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int save; |
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int have_inet = 1; |
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int have_inet6 = 1; |
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/* First determine whether we have the appropriate interfaces.
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XXX I don't think we can cache the result since the system |
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can be reconfigured. */ |
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if ((flags & AI_ADDRCONFIG) != 0) |
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__protocol_available (&have_inet, &have_inet6); |
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/* Handle impossible requests first. */ |
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if ((type == AF_INET && have_inet == 0) |
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|| (type == AF_INET6 && have_inet6 == 0 && ((flags & AI_V4MAPPED) == 0 |
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|| have_inet == 0)) |
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|| (type != AF_INET && type != AF_INET6)) |
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{ |
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*h_errnop = NO_DATA; |
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return NULL; |
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} |
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buffer_size = BUFLEN; |
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buffer = (char *) malloc (buffer_size); |
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result = NULL; |
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if (buffer != NULL) |
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{ |
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#define HAVE_TYPE |
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#define resbuf (*((struct hostent *) buffer)) |
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#include "../nss/digits_dots.c" |
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} |
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if (startp == NULL) |
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{ |
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no_more = __nss_hosts_lookup (&nip, "getipnodebyname_r", (void **) &fct); |
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if (no_more) |
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startp = (service_user *) -1l; |
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else |
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{ |
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startp = nip; |
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start_fct = fct; |
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} |
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} |
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else |
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{ |
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fct = start_fct; |
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no_more = (nip = startp) == (service_user *) -1l; |
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} |
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/* First do a lookup with the original protocol type. */ |
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while (no_more == 0 && buffer != NULL) |
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{ |
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enum nss_status status; |
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status = DL_CALL_FCT (fct, (name, type, |
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((flags & AI_ALL) |
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? flags : (flags & ~AI_V4MAPPED)), |
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(struct hostent *) buffer, |
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(char *) ((struct hostent *) buffer + 1), |
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buffer_size - sizeof (struct hostent), |
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&errno, h_errnop)); |
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if (status == NSS_STATUS_SUCCESS) |
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{ |
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result = (struct hostent *) buffer; |
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break; |
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} |
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if (status == NSS_STATUS_TRYAGAIN && *h_errnop == NETDB_INTERNAL |
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&& errno == ERANGE) |
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{ |
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/* Resize the buffer, it's too small. */ |
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buffer_size += BUFLEN; |
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buffer = (char *) realloc (buffer, buffer_size); |
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continue; |
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} |
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no_more = __nss_next (&nip, "getipnodebyname_r", |
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(void **) &fct, status, 0); |
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} |
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/* If we are looking for an IPv6 address but haven't found any and
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do not have the AI_ALL but the AI_V4MAPPED flag set, now try |
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looking up an IPv4 address and map it. */ |
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if (buffer != NULL && result == NULL |
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&& type == AF_INET6 && (flags & AI_V4MAPPED) != 0 |
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&& (no_more = (nip = startp) == (service_user *) -1l) == 0) |
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{ |
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/* We have to use a new buffer if there is already a result. */ |
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fct = start_fct; |
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do |
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{ |
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enum nss_status status; |
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status = DL_CALL_FCT (fct, (name, type, flags, |
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(struct hostent *) buffer, |
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(char *) ((struct hostent *) buffer + 1), |
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buffer_size - sizeof (struct hostent), |
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&errno, h_errnop)); |
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if (status == NSS_STATUS_SUCCESS) |
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{ |
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result = (struct hostent *) buffer; |
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break; |
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} |
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if (status == NSS_STATUS_TRYAGAIN && *h_errnop == NETDB_INTERNAL |
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&& errno == ERANGE) |
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{ |
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/* Resize the buffer, it's too small. */ |
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buffer_size += BUFLEN; |
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buffer = (char *) realloc (buffer, buffer_size); |
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continue; |
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} |
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no_more = __nss_next (&nip, "getipnodebyname_r", |
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(void **) &fct, status, 0); |
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} |
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while (no_more == 0 && buffer != NULL); |
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} |
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done: |
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if (buffer == NULL) |
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{ |
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/* We are out of memory. */ |
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*h_errnop = TRY_AGAIN; |
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assert (result == NULL); |
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} |
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else if (result == NULL && buffer != NULL) |
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free (buffer); |
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return result; |
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} |
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