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/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <hesiod.h>
#include <netdb.h>
#include <netinet/in.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
NSS_DECLARE_MODULE_FUNCTIONS (hesiod)
/* Hesiod uses a format for service entries that differs from the
traditional format. We therefore declare our own parser. */
#define ENTNAME servent
struct servent_data {};
#define TRAILING_LIST_MEMBER s_aliases
#define TRAILING_LIST_SEPARATOR_P isspace
#include <nss/nss_files/files-parse.c>
#define ISSC_OR_SPACE(c) ((c) == ';' || isspace (c))
LINE_PARSER
("#",
STRING_FIELD (result->s_name, ISSC_OR_SPACE, 1);
STRING_FIELD (result->s_proto, ISSC_OR_SPACE, 1);
INT_FIELD (result->s_port, ISSC_OR_SPACE, 10, 0, htons);
)
enum nss_status
_nss_hesiod_setservent (int stayopen)
{
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_endservent (void)
{
return NSS_STATUS_SUCCESS;
}
static enum nss_status
lookup (const char *name, const char *type, const char *protocol,
struct servent *serv, char *buffer, size_t buflen, int *errnop)
{
struct parser_data *data = (void *) buffer;
size_t linebuflen;
void *context;
char **list, **item;
int parse_res;
int found;
int olderr = errno;
if (hesiod_init (&context) < 0)
return NSS_STATUS_UNAVAIL;
list = hesiod_resolve (context, name, type);
if (list == NULL)
{
int err = errno;
hesiod_end (context);
__set_errno (olderr);
return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
}
linebuflen = buffer + buflen - data->linebuffer;
item = list;
found = 0;
do
{
size_t len = strlen (*item) + 1;
if (linebuflen < len)
{
hesiod_free_list (context, list);
hesiod_end (context);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
memcpy (data->linebuffer, *item, len);
parse_res = parse_line (buffer, serv, data, buflen, errnop);
if (parse_res == -1)
{
hesiod_free_list (context, list);
hesiod_end (context);
return NSS_STATUS_TRYAGAIN;
}
if (parse_res > 0)
found = protocol == NULL || strcasecmp (serv->s_proto, protocol) == 0;
++item;
}
while (*item != NULL && !found);
hesiod_free_list (context, list);
hesiod_end (context);
if (found == 0)
{
__set_errno (olderr);
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_hesiod_getservbyname_r (const char *name, const char *protocol,
struct servent *serv,
char *buffer, size_t buflen, int *errnop)
{
return lookup (name, "service", protocol, serv, buffer, buflen, errnop);
}
enum nss_status
_nss_hesiod_getservbyport_r (const int port, const char *protocol,
struct servent *serv,
char *buffer, size_t buflen, int *errnop)
{
char portstr[6]; /* Port numbers are restricted to 16 bits. */
snprintf (portstr, sizeof portstr, "%d", ntohs (port));
return lookup (portstr, "port", protocol, serv, buffer, buflen, errnop);
}
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