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/*
Unix SMB/CIFS implementation.
Samba system utilities
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998-2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/network.h"
#include "system/filesys.h"
#undef malloc
/*
The idea is that this file will eventually have wrappers around all
important system calls in samba. The aims are:
- to enable easier porting by putting OS dependent stuff in here
- to allow for hooks into other "pseudo-filesystems"
- to allow easier integration of things like the japanese extensions
- to support the philosophy of Samba to expose the features of
the OS within the SMB model. In general whatever file/printer/variable
expansions/etc make sense to the OS should be acceptable to Samba.
*/
/*******************************************************************
A wrapper for memalign
********************************************************************/
void *sys_memalign( size_t align, size_t size )
{
#if defined(HAVE_POSIX_MEMALIGN)
void *p = NULL;
int ret = posix_memalign( &p, align, size );
if ( ret == 0 )
return p;
return NULL;
#elif defined(HAVE_MEMALIGN)
return memalign( align, size );
#else
/* On *BSD systems memaligns doesn't exist, but memory will
* be aligned on allocations of > pagesize. */
#if defined(SYSCONF_SC_PAGESIZE)
size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
#elif defined(HAVE_GETPAGESIZE)
size_t pagesize = (size_t)getpagesize();
#else
size_t pagesize = (size_t)-1;
#endif
if (pagesize == (size_t)-1) {
DEBUG(0,("memalign functionalaity not available on this platform!\n"));
return NULL;
}
if (size < pagesize) {
size = pagesize;
}
return malloc(size);
#endif
}
/**************************************************************************
A wrapper for gethostbyname() that tries avoids looking up hostnames
in the root domain, which can cause dial-on-demand links to come up for no
apparent reason.
****************************************************************************/
_PUBLIC_ struct hostent *sys_gethostbyname(const char *name)
{
#ifdef REDUCE_ROOT_DNS_LOOKUPS
char query[256], hostname[256];
char *domain;
/* Does this name have any dots in it? If so, make no change */
if (strchr(name, '.'))
return(gethostbyname(name));
/* Get my hostname, which should have domain name
attached. If not, just do the gethostname on the
original string.
*/
gethostname(hostname, sizeof(hostname) - 1);
hostname[sizeof(hostname) - 1] = 0;
if ((domain = strchr(hostname, '.')) == NULL)
return(gethostbyname(name));
/* Attach domain name to query and do modified query.
If names too large, just do gethostname on the
original string.
*/
if((strlen(name) + strlen(domain)) >= sizeof(query))
return(gethostbyname(name));
slprintf(query, sizeof(query)-1, "%s%s", name, domain);
return(gethostbyname(query));
#else /* REDUCE_ROOT_DNS_LOOKUPS */
return(gethostbyname(name));
#endif /* REDUCE_ROOT_DNS_LOOKUPS */
}
_PUBLIC_ struct in_addr sys_inet_makeaddr(int net, int host)
{
struct in_addr in;
struct in_addr in2;
in = inet_makeaddr(net, host);
in2.s_addr = in.s_addr;
return in2;
}
/**************************************************************************
Wrapper for fork. Ensures we clear our pid cache.
****************************************************************************/
static pid_t mypid = (pid_t)-1;
_PUBLIC_ pid_t sys_fork(void)
{
pid_t forkret = fork();
if (forkret == (pid_t)0) {
/* Child - reset mypid so sys_getpid does a system call. */
mypid = (pid_t) -1;
}
return forkret;
}
/**************************************************************************
Wrapper for getpid. Ensures we only do a system call *once*.
****************************************************************************/
_PUBLIC_ pid_t sys_getpid(void)
{
if (mypid == (pid_t)-1)
mypid = getpid();
return mypid;
}
_PUBLIC_ int sys_getpeereid( int s, uid_t *uid)
{
#if defined(HAVE_PEERCRED)
struct ucred cred;
socklen_t cred_len = sizeof(struct ucred);
int ret;
ret = getsockopt(s, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &cred_len);
if (ret != 0) {
return -1;
}
if (cred_len != sizeof(struct ucred)) {
errno = EINVAL;
return -1;
}
*uid = cred.uid;
return 0;
#else
#if defined(HAVE_GETPEEREID)
gid_t gid;
return getpeereid(s, uid, &gid);
#endif
errno = ENOSYS;
return -1;
#endif
}
_PUBLIC_ int sys_getnameinfo(const struct sockaddr *psa,
int salen,
char *host,
size_t hostlen,
char *service,
size_t servlen,
int flags)
{
/*
* For Solaris we must make sure salen is the
* correct length for the incoming sa_family.
*/
if (salen == sizeof(struct sockaddr_storage)) {
salen = sizeof(struct sockaddr_in);
#if defined(HAVE_IPV6)
if (psa->sa_family == AF_INET6) {
salen = sizeof(struct sockaddr_in6);
}
#endif
}
return getnameinfo(psa, salen, host, hostlen, service, servlen, flags);
}
_PUBLIC_ int sys_connect(int fd, const struct sockaddr * addr)
{
socklen_t salen = (socklen_t)-1;
if (addr->sa_family == AF_INET) {
salen = sizeof(struct sockaddr_in);
} else if (addr->sa_family == AF_UNIX) {
salen = sizeof(struct sockaddr_un);
}
#if defined(HAVE_IPV6)
else if (addr->sa_family == AF_INET6) {
salen = sizeof(struct sockaddr_in6);
}
#endif
return connect(fd, addr, salen);
}
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