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|
/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001-2002
Copyright (C) Simo Sorce 2001
Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
Copyright (C) James J Myers 2003
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "dynconfig.h"
#include "system/network.h"
#include "system/iconv.h"
/**************************************************************************n
Find a suitable temporary directory. The result should be copied immediately
as it may be overwritten by a subsequent call.
****************************************************************************/
const char *tmpdir(void)
{
char *p;
if ((p = getenv("TMPDIR")))
return p;
return "/tmp";
}
/*******************************************************************
Check if a file exists - call vfs_file_exist for samba files.
********************************************************************/
BOOL file_exist(const char *fname, struct stat *sbuf)
{
struct stat st;
if (!sbuf)
sbuf = &st;
if (stat(fname,sbuf) != 0)
return(False);
return((S_ISREG(sbuf->st_mode)) || (S_ISFIFO(sbuf->st_mode)));
}
/*******************************************************************
Check a files mod time.
********************************************************************/
time_t file_modtime(const char *fname)
{
struct stat st;
if (stat(fname,&st) != 0)
return(0);
return(st.st_mtime);
}
/*******************************************************************
Check if a directory exists.
********************************************************************/
BOOL directory_exist(const char *dname,struct stat *st)
{
struct stat st2;
BOOL ret;
if (!st)
st = &st2;
if (stat(dname,st) != 0)
return(False);
ret = S_ISDIR(st->st_mode);
if(!ret)
errno = ENOTDIR;
return ret;
}
/*******************************************************************
Returns the size in bytes of the named file.
********************************************************************/
off_t get_file_size(char *file_name)
{
struct stat buf;
buf.st_size = 0;
if(stat(file_name,&buf) != 0)
return (off_t)-1;
return(buf.st_size);
}
/*******************************************************************
Close the low 3 fd's and open dev/null in their place.
********************************************************************/
void close_low_fds(BOOL stderr_too)
{
#ifndef VALGRIND
int fd;
int i;
close(0);
close(1);
if (stderr_too)
close(2);
/* try and use up these file descriptors, so silly
library routines writing to stdout etc won't cause havoc */
for (i=0;i<3;i++) {
if (i == 2 && !stderr_too)
continue;
fd = open("/dev/null",O_RDWR,0);
if (fd < 0)
fd = open("/dev/null",O_WRONLY,0);
if (fd < 0) {
DEBUG(0,("Can't open /dev/null\n"));
return;
}
if (fd != i) {
DEBUG(0,("Didn't get file descriptor %d\n",i));
return;
}
}
#endif
}
/****************************************************************************
Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
else
if SYSV use O_NDELAY
if BSD use FNDELAY
****************************************************************************/
int set_blocking(int fd, BOOL set)
{
int val;
#ifdef O_NONBLOCK
#define FLAG_TO_SET O_NONBLOCK
#else
#ifdef SYSV
#define FLAG_TO_SET O_NDELAY
#else /* BSD */
#define FLAG_TO_SET FNDELAY
#endif
#endif
if((val = fcntl(fd, F_GETFL, 0)) == -1)
return -1;
if(set) /* Turn blocking on - ie. clear nonblock flag */
val &= ~FLAG_TO_SET;
else
val |= FLAG_TO_SET;
return fcntl( fd, F_SETFL, val);
#undef FLAG_TO_SET
}
/*******************************************************************
Sleep for a specified number of milliseconds.
********************************************************************/
void msleep(uint_t t)
{
struct timeval tval;
tval.tv_sec = t/1000;
tval.tv_usec = 1000*(t%1000);
/* this should be the real select - do NOT replace
with sys_select() */
select(0,NULL,NULL,NULL,&tval);
}
/****************************************************************************
Become a daemon, discarding the controlling terminal.
****************************************************************************/
void become_daemon(BOOL Fork)
{
if (Fork) {
if (fork()) {
_exit(0);
}
}
/* detach from the terminal */
#ifdef HAVE_SETSID
setsid();
#elif defined(TIOCNOTTY)
{
int i = open("/dev/tty", O_RDWR, 0);
if (i != -1) {
ioctl(i, (int) TIOCNOTTY, (char *)0);
close(i);
}
}
#endif /* HAVE_SETSID */
/* Close fd's 0,1,2. Needed if started by rsh */
close_low_fds(False); /* Don't close stderr, let the debug system
attach it to the logfile */
}
/****************************************************************************
Expand a pointer to be a particular size.
****************************************************************************/
void *Realloc(void *p,size_t size)
{
void *ret=NULL;
if (size == 0) {
SAFE_FREE(p);
DEBUG(5,("Realloc asked for 0 bytes\n"));
return NULL;
}
if (!p)
ret = (void *)malloc(size);
else
ret = (void *)realloc(p,size);
if (!ret)
DEBUG(0,("Memory allocation error: failed to expand to %d bytes\n",(int)size));
return(ret);
}
/****************************************************************************
Free memory, checks for NULL.
Use directly SAFE_FREE()
Exists only because we need to pass a function pointer somewhere --SSS
****************************************************************************/
void safe_free(void *p)
{
SAFE_FREE(p);
}
/*
see if a string matches either our primary or one of our secondary
netbios aliases. do a case insensitive match
*/
BOOL is_myname(const char *name)
{
const char **aliases;
int i;
if (strcasecmp(name, lp_netbios_name()) == 0) {
return True;
}
aliases = lp_netbios_aliases();
for (i=0; aliases && aliases[i]; i++) {
if (strcasecmp(name, aliases[i]) == 0) {
return True;
}
}
return False;
}
/****************************************************************************
Get my own name, return in malloc'ed storage.
****************************************************************************/
char* get_myname(void)
{
char *hostname;
const int host_name_max = 255;
char *p;
hostname = malloc(host_name_max+1);
*hostname = 0;
/* get my host name */
if (gethostname(hostname, host_name_max+1) == -1) {
DEBUG(0,("gethostname failed\n"));
return NULL;
}
/* Ensure null termination. */
hostname[host_name_max] = '\0';
/* split off any parts after an initial . */
p = strchr_m(hostname,'.');
if (p)
*p = 0;
return hostname;
}
/****************************************************************************
Get my own name, including domain.
****************************************************************************/
BOOL get_myfullname(char *my_name)
{
pstring hostname;
*hostname = 0;
/* get my host name */
if (gethostname(hostname, sizeof(hostname)) == -1) {
DEBUG(0,("gethostname failed\n"));
return False;
}
/* Ensure null termination. */
hostname[sizeof(hostname)-1] = '\0';
if (my_name)
fstrcpy(my_name, hostname);
return True;
}
/****************************************************************************
Get my own domain name.
****************************************************************************/
BOOL get_mydomname(fstring my_domname)
{
pstring hostname;
char *p;
*hostname = 0;
/* get my host name */
if (gethostname(hostname, sizeof(hostname)) == -1) {
DEBUG(0,("gethostname failed\n"));
return False;
}
/* Ensure null termination. */
hostname[sizeof(hostname)-1] = '\0';
p = strchr_m(hostname, '.');
if (!p)
return False;
p++;
if (my_domname)
fstrcpy(my_domname, p);
return True;
}
/****************************************************************************
Interpret a protocol description string, with a default.
****************************************************************************/
int interpret_protocol(char *str,int def)
{
if (strequal(str,"NT1"))
return(PROTOCOL_NT1);
if (strequal(str,"LANMAN2"))
return(PROTOCOL_LANMAN2);
if (strequal(str,"LANMAN1"))
return(PROTOCOL_LANMAN1);
if (strequal(str,"CORE"))
return(PROTOCOL_CORE);
if (strequal(str,"COREPLUS"))
return(PROTOCOL_COREPLUS);
if (strequal(str,"CORE+"))
return(PROTOCOL_COREPLUS);
DEBUG(0,("Unrecognised protocol level %s\n",str));
return(def);
}
/****************************************************************************
Return true if a string could be a pure IP address.
****************************************************************************/
BOOL is_ipaddress(const char *str)
{
BOOL pure_address = True;
int i;
for (i=0; pure_address && str[i]; i++)
if (!(isdigit((int)str[i]) || str[i] == '.'))
pure_address = False;
/* Check that a pure number is not misinterpreted as an IP */
pure_address = pure_address && (strchr_m(str, '.') != NULL);
return pure_address;
}
/****************************************************************************
Interpret an internet address or name into an IP address in 4 byte form.
****************************************************************************/
uint32_t interpret_addr(const char *str)
{
struct hostent *hp;
uint32_t res;
if (str == NULL ||
strcmp(str,"0.0.0.0") == 0) {
return 0;
}
if (strcmp(str,"255.255.255.255") == 0) {
return 0xFFFFFFFF;
}
/* if it's in the form of an IP address then get the lib to interpret it */
if (is_ipaddress(str)) {
res = sys_inet_addr(str);
} else {
/* otherwise assume it's a network name of some sort and use
sys_gethostbyname */
if ((hp = sys_gethostbyname(str)) == 0) {
DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
return 0;
}
if(hp->h_addr == NULL) {
DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
return 0;
}
putip((char *)&res,(char *)hp->h_addr);
}
if (res == (uint32_t)-1)
return(0);
return(res);
}
/*******************************************************************
A convenient addition to interpret_addr().
******************************************************************/
struct ipv4_addr interpret_addr2(const char *str)
{
struct ipv4_addr ret;
uint32_t a = interpret_addr(str);
ret.addr = a;
return ret;
}
/*******************************************************************
Check if an IP is the 0.0.0.0.
******************************************************************/
BOOL is_zero_ip(struct ipv4_addr ip)
{
uint32_t a;
putip((char *)&a,(char *)&ip);
return(a == 0);
}
/*******************************************************************
Set an IP to 0.0.0.0.
******************************************************************/
void zero_ip(struct ipv4_addr *ip)
{
*ip = sys_inet_makeaddr(0,0);
return;
}
/*******************************************************************
Are two IPs on the same subnet?
********************************************************************/
BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask)
{
uint32_t net1,net2,nmask;
nmask = ntohl(mask.addr);
net1 = ntohl(ip1.addr);
net2 = ntohl(ip2.addr);
return((net1 & nmask) == (net2 & nmask));
}
/****************************************************************************
Check if a process exists. Does this work on all unixes?
****************************************************************************/
BOOL process_exists(pid_t pid)
{
/* Doing kill with a non-positive pid causes messages to be
* sent to places we don't want. */
SMB_ASSERT(pid > 0);
return(kill(pid,0) == 0 || errno != ESRCH);
}
/****************************************************************************
Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
is dealt with in posix.c
****************************************************************************/
BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
{
struct flock lock;
int ret;
DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
lock.l_type = type;
lock.l_whence = SEEK_SET;
lock.l_start = offset;
lock.l_len = count;
lock.l_pid = 0;
ret = fcntl(fd,op,&lock);
if (ret == -1 && errno != 0)
DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
/* a lock query */
if (op == F_GETLK) {
if ((ret != -1) &&
(lock.l_type != F_UNLCK) &&
(lock.l_pid != 0) &&
(lock.l_pid != getpid())) {
DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
return(True);
}
/* it must be not locked or locked by me */
return(False);
}
/* a lock set or unset */
if (ret == -1) {
DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
(double)offset,(double)count,op,type,strerror(errno)));
return(False);
}
/* everything went OK */
DEBUG(8,("fcntl_lock: Lock call successful\n"));
return(True);
}
static void print_asc(int level, const uint8_t *buf,int len)
{
int i;
for (i=0;i<len;i++)
DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
}
void dump_data(int level, const uint8_t *buf,int len)
{
int i=0;
if (len<=0) return;
if (!DEBUGLVL(level)) return;
DEBUGADD(level,("[%03X] ",i));
for (i=0;i<len;) {
DEBUGADD(level,("%02X ",(int)buf[i]));
i++;
if (i%8 == 0) DEBUGADD(level,(" "));
if (i%16 == 0) {
print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
if (i<len) DEBUGADD(level,("[%03X] ",i));
}
}
if (i%16) {
int n;
n = 16 - (i%16);
DEBUGADD(level,(" "));
if (n>8) DEBUGADD(level,(" "));
while (n--) DEBUGADD(level,(" "));
n = MIN(8,i%16);
print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
n = (i%16) - n;
if (n>0) print_asc(level,&buf[i-n],n);
DEBUGADD(level,("\n"));
}
}
/*****************************************************************
Possibly replace mkstemp if it is broken.
*****************************************************************/
int smb_mkstemp(char *template)
{
#if HAVE_SECURE_MKSTEMP
return mkstemp(template);
#else
/* have a reasonable go at emulating it. Hope that
the system mktemp() isn't completly hopeless */
char *p = mktemp(template);
if (!p)
return -1;
return open(p, O_CREAT|O_EXCL|O_RDWR, 0600);
#endif
}
/*****************************************************************
malloc that aborts with smb_panic on fail or zero size.
*****************************************************************/
void *smb_xmalloc(size_t size)
{
void *p;
if (size == 0)
smb_panic("smb_xmalloc: called with zero size.\n");
if ((p = malloc(size)) == NULL)
smb_panic("smb_xmalloc: malloc fail.\n");
return p;
}
/**
Memdup with smb_panic on fail.
**/
void *smb_xmemdup(const void *p, size_t size)
{
void *p2;
p2 = smb_xmalloc(size);
memcpy(p2, p, size);
return p2;
}
/**
strdup that aborts on malloc fail.
**/
char *smb_xstrdup(const char *s)
{
char *s1 = strdup(s);
if (!s1)
smb_panic("smb_xstrdup: malloc fail\n");
return s1;
}
/*****************************************************************
Like strdup but for memory.
*****************************************************************/
void *memdup(const void *p, size_t size)
{
void *p2;
if (size == 0)
return NULL;
p2 = malloc(size);
if (!p2)
return NULL;
memcpy(p2, p, size);
return p2;
}
/*****************************************************************
Get local hostname and cache result.
*****************************************************************/
char *myhostname(TALLOC_CTX *mem_ctx)
{
char *myname, *ret;
myname = get_myname();
ret = talloc_strdup(mem_ctx, myname);
free(myname);
return ret;
}
/**********************************************************************
Converts a name to a fully qalified domain name.
***********************************************************************/
char *name_to_fqdn(TALLOC_CTX *mem_ctx, const char *name)
{
struct hostent *hp = sys_gethostbyname(name);
if ( hp && hp->h_name && *hp->h_name ) {
DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, hp->h_name));
return talloc_strdup(mem_ctx, hp->h_name);
} else {
DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name));
return talloc_strdup(mem_ctx, name);
}
}
/*****************************************************************
A useful function for returning a path in the Samba lock directory.
*****************************************************************/
char *lock_path(TALLOC_CTX* mem_ctx, const char *name)
{
char *fname, *dname;
dname = talloc_strdup(mem_ctx, lp_lockdir());
trim_string(dname,"","/");
if (!directory_exist(dname,NULL)) {
mkdir(dname,0755);
}
fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
talloc_free(dname);
return fname;
}
/**
* @brief Returns an absolute path to a file in the Samba lib directory.
*
* @param name File to find, relative to LIBDIR.
*
* @retval Pointer to a talloc'ed string containing the full path.
**/
char *lib_path(TALLOC_CTX* mem_ctx, const char *name)
{
char *fname;
fname = talloc_asprintf(mem_ctx, "%s/%s", dyn_LIBDIR, name);
return fname;
}
/*
return a path in the smbd.tmp directory, where all temporary file
for smbd go. If NULL is passed for name then return the directory
path itself
*/
char *smbd_tmp_path(TALLOC_CTX *mem_ctx, const char *name)
{
char *fname, *dname;
dname = lock_path(mem_ctx, "smbd.tmp");
if (!directory_exist(dname,NULL)) {
mkdir(dname,0755);
}
if (name == NULL) {
return dname;
}
fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
talloc_free(dname);
return fname;
}
/**
* @brief Returns the platform specific shared library extension.
*
* @retval Pointer to a static #fstring containing the extension.
**/
const char *shlib_ext(void)
{
return dyn_SHLIBEXT;
}
void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
{
#ifdef DEBUG_PASSWORD
DEBUG(11, ("%s", msg));
if (data != NULL && len > 0)
{
dump_data(11, data, len);
}
#endif
}
/* see if a range of memory is all zero. A NULL pointer is considered
to be all zero */
BOOL all_zero(const uint8_t *ptr, uint_t size)
{
int i;
if (!ptr) return True;
for (i=0;i<size;i++) {
if (ptr[i]) return False;
}
return True;
}
/*
realloc an array, checking for integer overflow in the array size
*/
void *realloc_array(void *ptr, size_t el_size, unsigned count)
{
#define MAX_MALLOC_SIZE 0x7fffffff
if (count == 0 ||
count >= MAX_MALLOC_SIZE/el_size) {
return NULL;
}
if (!ptr) {
return malloc(el_size * count);
}
return realloc(ptr, el_size * count);
}
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