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glibc/nis/nss_nis/nis-service.c
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/* 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 instatus; | |
if (inkey && inkeylen > 0 && inval && invallen > 0) | |
{ | |
struct response_t *newp = malloc (sizeof (struct response_t) | |
+ invallen + 1); | |
if (newp == NULL) | |
return YP_FALSE; /* 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; | |
} |