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144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/* Copyright (C) 1997-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <hesiod.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <nss.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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NSS_DECLARE_MODULE_FUNCTIONS (hesiod)
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/* Declare a parser for Hesiod protocol entries. Although the format
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of the entries is identical to those in /etc/protocols, here is no
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predefined parser for us to use. */
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#define ENTNAME protoent
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struct protoent_data {};
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#define TRAILING_LIST_MEMBER p_aliases
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#define TRAILING_LIST_SEPARATOR_P isspace
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#include <nss/nss_files/files-parse.c>
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LINE_PARSER
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("#",
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STRING_FIELD (result->p_name, isspace, 1);
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INT_FIELD (result->p_proto, isspace, 1, 10,);
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)
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enum nss_status
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_nss_hesiod_setprotoent (int stayopen)
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{
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_hesiod_endprotoent (void)
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{
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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lookup (const char *name, const char *type, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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struct parser_data *data = (void *) buffer;
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size_t linebuflen;
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void *context;
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char **list, **item;
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int parse_res;
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int found;
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int olderr = errno;
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, name, type);
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if (list == NULL)
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{
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int err = errno;
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hesiod_end (context);
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__set_errno (olderr);
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return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
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}
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linebuflen = buffer + buflen - data->linebuffer;
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item = list;
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found = 0;
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do
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{
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size_t len = strlen (*item) + 1;
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if (linebuflen < len)
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{
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hesiod_free_list (context, list);
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hesiod_end (context);
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy (data->linebuffer, *item, len);
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parse_res = parse_line (buffer, proto, data, buflen, errnop);
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if (parse_res == -1)
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{
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hesiod_free_list (context, list);
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hesiod_end (context);
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return NSS_STATUS_TRYAGAIN;
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}
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if (parse_res > 0)
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found = 1;
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++item;
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}
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while (*item != NULL && !found);
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hesiod_free_list (context, list);
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hesiod_end (context);
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if (found == 0)
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{
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__set_errno (olderr);
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return NSS_STATUS_NOTFOUND;
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_hesiod_getprotobyname_r (const char *name, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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return lookup (name, "protocol", proto, buffer, buflen, errnop);
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}
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enum nss_status
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_nss_hesiod_getprotobynumber_r (const int protocol, struct protoent *proto,
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char *buffer, size_t buflen, int *errnop)
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{
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char protostr[21];
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snprintf (protostr, sizeof protostr, "%d", protocol);
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return lookup (protostr, "protonum", proto, buffer, buflen, errnop);
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}
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