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glibc/sunrpc/netname.c
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. | |
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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <string.h> | |
#include <rpc/rpc.h> | |
#include "nsswitch.h" | |
#define OPSYS_LEN 4 | |
#define MAXIPRINT (11) /* max length of printed integer */ | |
static const char OPSYS[] = "unix"; | |
int | |
user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid, | |
const char *domain) | |
{ | |
char dfltdom[MAXNETNAMELEN + 1]; | |
size_t i; | |
if (domain == NULL) | |
{ | |
if (getdomainname (dfltdom, sizeof (dfltdom)) < 0) | |
return 0; | |
} | |
else | |
{ | |
strncpy (dfltdom, domain, MAXNETNAMELEN); | |
dfltdom[MAXNETNAMELEN] = '\0'; | |
} | |
if ((strlen (dfltdom) + OPSYS_LEN + 3 + MAXIPRINT) > (size_t) MAXNETNAMELEN) | |
return 0; | |
sprintf (netname, "%s.%d@%s", OPSYS, uid, dfltdom); | |
i = strlen (netname); | |
if (netname[i - 1] == '.') | |
netname[i - 1] = '\0'; | |
return 1; | |
} | |
libc_hidden_nolink_sunrpc (user2netname, GLIBC_2_1) | |
int | |
host2netname (char netname[MAXNETNAMELEN + 1], const char *host, | |
const char *domain) | |
{ | |
char *p; | |
char hostname[MAXHOSTNAMELEN + 1]; | |
char domainname[MAXHOSTNAMELEN + 1]; | |
char *dot_in_host; | |
size_t i; | |
netname[0] = '\0'; /* make null first (no need for memset) */ | |
if (host == NULL) | |
__gethostname (hostname, MAXHOSTNAMELEN); | |
else | |
{ | |
strncpy (hostname, host, MAXHOSTNAMELEN); | |
hostname[MAXHOSTNAMELEN] = '\0'; | |
} | |
dot_in_host = strchr (hostname, '.'); | |
if (domain == NULL) | |
{ | |
p = dot_in_host; | |
if (p) | |
{ | |
++p; | |
strncpy (domainname, p, MAXHOSTNAMELEN); | |
domainname[MAXHOSTNAMELEN] = '\0'; | |
} | |
else | |
{ | |
domainname[0] = 0; | |
getdomainname (domainname, MAXHOSTNAMELEN); | |
} | |
} | |
else | |
{ | |
strncpy (domainname, domain, MAXHOSTNAMELEN); | |
domainname[MAXHOSTNAMELEN] = '\0'; | |
} | |
i = strlen (domainname); | |
if (i == 0) | |
/* No domainname */ | |
return 0; | |
if (domainname[i - 1] == '.') | |
domainname[i - 1] = 0; | |
if (dot_in_host) /* strip off rest of name */ | |
*dot_in_host = '\0'; | |
if ((strlen (domainname) + strlen (hostname) + OPSYS_LEN + 3) | |
> MAXNETNAMELEN) | |
return 0; | |
sprintf (netname, "%s.%s@%s", OPSYS, hostname, domainname); | |
return 1; | |
} | |
#ifdef EXPORT_RPC_SYMBOLS | |
libc_hidden_def (host2netname) | |
#else | |
libc_hidden_nolink_sunrpc (host2netname, GLIBC_2_1) | |
#endif | |
int | |
getnetname (char name[MAXNETNAMELEN + 1]) | |
{ | |
uid_t uid; | |
int dummy; | |
uid = __geteuid (); | |
if (uid == 0) | |
dummy = host2netname (name, NULL, NULL); | |
else | |
dummy = user2netname (name, uid, NULL); | |
return (dummy); | |
} | |
libc_hidden_nolink_sunrpc (getnetname, GLIBC_2_1) | |
/* Type of the lookup function for netname2user. */ | |
typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1], | |
uid_t *, gid_t *, int *, gid_t *); | |
/* The lookup function for the first entry of this service. */ | |
extern int __nss_publickey_lookup (service_user ** nip, const char *name, | |
void **fctp) internal_function; | |
int | |
netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp, | |
int *gidlenp, gid_t * gidlist) | |
{ | |
static service_user *startp; | |
static netname2user_function start_fct; | |
service_user *nip; | |
union | |
{ | |
netname2user_function f; | |
void *ptr; | |
} fct; | |
enum nss_status status = NSS_STATUS_UNAVAIL; | |
int no_more; | |
if (startp == NULL) | |
{ | |
no_more = __nss_publickey_lookup (&nip, "netname2user", &fct.ptr); | |
if (no_more) | |
startp = (service_user *) - 1; | |
else | |
{ | |
startp = nip; | |
start_fct = fct.f; | |
} | |
} | |
else | |
{ | |
fct.f = start_fct; | |
no_more = (nip = startp) == (service_user *) - 1; | |
} | |
while (!no_more) | |
{ | |
status = (*fct.f) (netname, uidp, gidp, gidlenp, gidlist); | |
no_more = __nss_next2 (&nip, "netname2user", NULL, &fct.ptr, status, 0); | |
} | |
return status == NSS_STATUS_SUCCESS; | |
} | |
#ifdef EXPORT_RPC_SYMBOLS | |
libc_hidden_def (netname2user) | |
#else | |
libc_hidden_nolink_sunrpc (netname2user, GLIBC_2_1) | |
#endif | |
int | |
netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname, | |
const int hostlen) | |
{ | |
char *p1, *p2; | |
p1 = strchr (netname, '.'); | |
if (p1 == NULL) | |
return 0; | |
p1++; | |
p2 = strchr (p1, '@'); | |
if (p2 == NULL) | |
return 0; | |
*p2 = '\0'; | |
if (hostlen > MAXNETNAMELEN) | |
return 0; | |
strncpy (hostname, p1, hostlen); | |
hostname[hostlen] = '\0'; | |
return 1; | |
} | |
libc_hidden_nolink_sunrpc (netname2host, GLIBC_2_1) |