glibc/nis/nss_nis/nis-service.c
Jakub Jelinek 0ecb606cb6 2.5-18.1
2007-07-12 18:26:36 +00:00

444 lines
10 KiB
C

/* Copyright (C) 1996-2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <nss.h>
#include <netdb.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "nss-nis.h"
/* Get the declaration of the parser function. */
#define ENTNAME servent
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
__libc_lock_define_initialized (static, lock)
struct response_t
{
struct response_t *next;
char val[0];
};
struct intern_t
{
struct response_t *start;
struct response_t *next;
};
typedef struct intern_t intern_t;
static intern_t intern = { NULL, NULL };
struct search_t
{
const char *name;
const char *proto;
int port;
enum nss_status status;
struct servent *serv;
char *buffer;
size_t buflen;
int *errnop;
};
static int
saveit (int instatus, char *inkey, int inkeylen, char *inval,
int invallen, char *indata)
{
intern_t *intern = (intern_t *) indata;
if (instatus != YP_TRUE)
return 1;
if (inkey && inkeylen > 0 && inval && invallen > 0)
{
struct response_t *newp = malloc (sizeof (struct response_t)
+ invallen + 1);
if (newp == NULL)
return 1; /* We have no error code for out of memory */
if (intern->start == NULL)
intern->start = newp;
else
intern->next->next = newp;
intern->next = newp;
newp->next = NULL;
*((char *) mempcpy (newp->val, inval, invallen)) = '\0';
}
return 0;
}
static int
dosearch (int instatus, char *inkey, int inkeylen, char *inval,
int invallen, char *indata)
{
struct search_t *req = (struct search_t *) indata;
if (instatus != YP_TRUE)
return 1;
if (inkey && inkeylen > 0 && inval && invallen > 0)
{
struct parser_data *pdata = (void *) req->buffer;
int parse_res;
char *p;
if ((size_t) (invallen + 1) > req->buflen)
{
*req->errnop = ERANGE;
req->status = NSS_STATUS_TRYAGAIN;
return 1;
}
p = strncpy (req->buffer, inval, invallen);
req->buffer[invallen] = '\0';
while (isspace (*p))
++p;
parse_res = _nss_files_parse_servent (p, req->serv, pdata, req->buflen,
req->errnop);
if (parse_res == -1)
{
req->status = NSS_STATUS_TRYAGAIN;
return 1;
}
if (!parse_res)
return 0;
if (req->proto != NULL && strcmp (req->serv->s_proto, req->proto) != 0)
return 0;
if (req->port != -1 && req->serv->s_port != req->port)
return 0;
if (req->name != NULL && strcmp (req->serv->s_name, req->name) != 0)
{
char **cp;
for (cp = req->serv->s_aliases; *cp; cp++)
if (strcmp (req->name, *cp) == 0)
break;
if (*cp == NULL)
return 0;
}
req->status = NSS_STATUS_SUCCESS;
return 1;
}
return 0;
}
static enum nss_status
internal_nis_endservent (intern_t * intern)
{
while (intern->start != NULL)
{
intern->next = intern->start;
intern->start = intern->start->next;
free (intern->next);
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_endservent (void)
{
enum nss_status status;
__libc_lock_lock (lock);
status = internal_nis_endservent (&intern);
__libc_lock_unlock (lock);
return status;
}
static enum nss_status
internal_nis_setservent (intern_t *intern)
{
char *domainname;
struct ypall_callback ypcb;
enum nss_status status;
if (yp_get_default_domain (&domainname))
return NSS_STATUS_UNAVAIL;
(void) internal_nis_endservent (intern);
ypcb.foreach = saveit;
ypcb.data = (char *) intern;
status = yperr2nss (yp_all (domainname, "services.byname", &ypcb));
intern->next = intern->start;
return status;
}
enum nss_status
_nss_nis_setservent (int stayopen)
{
enum nss_status status;
__libc_lock_lock (lock);
status = internal_nis_setservent (&intern);
__libc_lock_unlock (lock);
return status;
}
static enum nss_status
internal_nis_getservent_r (struct servent *serv, char *buffer,
size_t buflen, int *errnop, intern_t *data)
{
struct parser_data *pdata = (void *) buffer;
int parse_res;
char *p;
if (data->start == NULL)
internal_nis_setservent (data);
/* Get the next entry until we found a correct one. */
do
{
if (data->next == NULL)
return NSS_STATUS_NOTFOUND;
p = strncpy (buffer, data->next->val, buflen);
while (isspace (*p))
++p;
parse_res = _nss_files_parse_servent (p, serv, pdata, buflen, errnop);
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
data->next = data->next->next;
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getservent_r (struct servent *serv, char *buffer, size_t buflen,
int *errnop)
{
enum nss_status status;
__libc_lock_lock (lock);
status = internal_nis_getservent_r (serv, buffer, buflen, errnop, &intern);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nis_getservbyname_r (const char *name, const char *protocol,
struct servent *serv, char *buffer, size_t buflen,
int *errnop)
{
enum nss_status status;
char *domain;
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
/* If the protocol is given, we could try if our NIS server knows
about services.byservicename map. If yes, we only need one query. */
char key[strlen (name) + (protocol ? strlen (protocol) : 0) + 2];
char *cp, *result;
size_t keylen, len;
int int_len;
/* key is: "name/proto" */
cp = stpcpy (key, name);
if (protocol)
{
*cp++ = '/';
strcpy (cp, protocol);
}
keylen = strlen (key);
status = yperr2nss (yp_match (domain, "services.byservicename", key,
keylen, &result, &int_len));
len = int_len;
/* If we found the key, it's ok and parse the result. If not,
fall through and parse the complete table. */
if (status == NSS_STATUS_SUCCESS)
{
struct parser_data *pdata = (void *) buffer;
int parse_res;
char *p;
if ((size_t) (len + 1) > buflen)
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = _nss_files_parse_servent (p, serv, pdata,
buflen, errnop);
if (parse_res < 0)
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}
/* Check if it is safe to rely on services.byservicename. */
if (_nis_default_nss () & NSS_FLAG_SERVICES_AUTHORITATIVE)
return status;
struct ypall_callback ypcb;
struct search_t req;
ypcb.foreach = dosearch;
ypcb.data = (char *) &req;
req.name = name;
req.proto = protocol;
req.port = -1;
req.serv = serv;
req.buffer = buffer;
req.buflen = buflen;
req.errnop = errnop;
req.status = NSS_STATUS_NOTFOUND;
status = yperr2nss (yp_all (domain, "services.byname", &ypcb));
if (status != NSS_STATUS_SUCCESS)
return status;
return req.status;
}
enum nss_status
_nss_nis_getservbyport_r (int port, const char *protocol,
struct servent *serv, char *buffer,
size_t buflen, int *errnop)
{
enum nss_status status;
char *domain;
if (yp_get_default_domain (&domain))
return NSS_STATUS_UNAVAIL;
/* If the protocol is given, we only need one query.
Otherwise try first port/tcp, then port/udp and then fallback
to sequential scanning of services.byname. */
const char *proto = protocol != NULL ? protocol : "tcp";
do
{
char key[sizeof (int) * 3 + strlen (proto) + 2];
char *result;
size_t keylen, len;
int int_len;
/* key is: "port/proto" */
keylen = snprintf (key, sizeof (key), "%d/%s", ntohs (port), proto);
status = yperr2nss (yp_match (domain, "services.byname", key,
keylen, &result, &int_len));
len = int_len;
/* If we found the key, it's ok and parse the result. If not,
fall through and parse the complete table. */
if (status == NSS_STATUS_SUCCESS)
{
struct parser_data *pdata = (void *) buffer;
int parse_res;
char *p;
if ((size_t) (len + 1) > buflen)
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
parse_res = _nss_files_parse_servent (p, serv, pdata,
buflen, errnop);
if (parse_res < 0)
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
else
return NSS_STATUS_SUCCESS;
}
}
while (protocol == NULL && (proto[0] == 't' ? (proto = "udp") : NULL));
if (port == -1)
return NSS_STATUS_NOTFOUND;
struct ypall_callback ypcb;
struct search_t req;
ypcb.foreach = dosearch;
ypcb.data = (char *) &req;
req.name = NULL;
req.proto = protocol;
req.port = port;
req.serv = serv;
req.buffer = buffer;
req.buflen = buflen;
req.errnop = errnop;
req.status = NSS_STATUS_NOTFOUND;
status = yperr2nss (yp_all (domain, "services.byname", &ypcb));
if (status != NSS_STATUS_SUCCESS)
return status;
return req.status;
}