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638 lines
12 KiB
638 lines
12 KiB
/*
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Copyright 1989, 1998 The Open Group
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Copyright 2000-2005 Oswald Buddenhagen <ossi@kde.org>
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of a copyright holder shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the copyright holder.
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*/
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/*
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* xdm - display manager daemon
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* Author: Keith Packard, MIT X Consortium
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*
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* various utility routines
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*/
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#include "dm.h"
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#include "dm_auth.h"
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#include "dm_error.h"
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#if 0 /*def USG; this was hpux once upon a time */
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# define NEED_UTSNAME
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#endif
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#ifdef NEED_UTSNAME
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# include <sys/utsname.h>
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#endif
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void *
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Calloc( size_t nmemb, size_t size )
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{
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void *ret;
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if (!(ret = calloc( nmemb, size )))
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LogOutOfMem();
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return ret;
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}
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void *
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Malloc( size_t size )
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{
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void *ret;
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if (!(ret = malloc( size )))
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LogOutOfMem();
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return ret;
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}
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void *
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Realloc( void *ptr, size_t size )
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{
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void *ret;
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if (!(ret = realloc( ptr, size )) && size)
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LogOutOfMem();
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return ret;
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}
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int
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StrCmp( const char *s1, const char *s2 )
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{
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if (s1 == s2)
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return 0;
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if (!s1)
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return -1;
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if (!s2)
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return 1;
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return strcmp( s1, s2 );
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}
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void
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WipeStr( char *str )
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{
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if (str) {
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bzero( str, strlen( str ) );
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free( str );
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}
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}
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#ifndef HAVE_STRNLEN
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int
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StrNLen( const char *s, int max )
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{
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unsigned l;
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for (l = 0; l < (unsigned)max && s[l]; l++);
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return l;
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}
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#endif
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/* duplicate src; wipe & free old dst string */
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int
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ReStrN( char **dst, const char *src, int len )
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{
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char *ndst = 0;
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if (src) {
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if (len < 0)
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len = strlen( src );
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if (*dst && !memcmp( *dst, src, len ) && !(*dst)[len])
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return 1;
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if (!(ndst = Malloc( len + 1 ))) {
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WipeStr( *dst );
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*dst = 0;
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return 0;
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}
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memcpy( ndst, src, len );
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ndst[len] = 0;
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}
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WipeStr( *dst ); /* make an option, if we should become heavily used */
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*dst = ndst;
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return 2;
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}
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int
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ReStr( char **dst, const char *src )
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{
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return ReStrN( dst, src, -1 );
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}
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/* duplicate src */
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int
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StrNDup( char **dst, const char *src, int len )
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{
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if (src) {
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if (len < 0)
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len = strlen( src );
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if (!(*dst = Malloc( len + 1 )))
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return 0;
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memcpy( *dst, src, len );
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(*dst)[len] = 0;
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} else
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*dst = 0;
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return 1;
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}
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int
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StrDup( char **dst, const char *src )
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{
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return StrNDup( dst, src, -1 );
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}
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/* append any number of strings to dst */
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int
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StrApp( char **dst, ... )
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{
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int len;
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char *bk, *pt, *dp;
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va_list va;
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len = 1;
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if (*dst)
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len += strlen( *dst );
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va_start( va, dst );
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for (;;) {
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pt = va_arg( va, char * );
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if (!pt)
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break;
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len += strlen( pt );
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}
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va_end( va );
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if (!(bk = Malloc( len ))) {
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if (*dst) {
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free( *dst );
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*dst = 0;
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}
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return 0;
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}
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dp = bk;
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if (*dst) {
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len = strlen( *dst );
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memcpy( dp, *dst, len );
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dp += len;
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free( *dst );
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}
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va_start( va, dst );
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for (;;) {
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pt = va_arg( va, char * );
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if (!pt)
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break;
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len = strlen( pt );
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memcpy( dp, pt, len );
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dp += len;
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}
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va_end( va );
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*dp = '\0';
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*dst = bk;
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return 1;
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}
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char **
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initStrArr( char **arr )
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{
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if (!arr && (arr = Malloc( sizeof(char *) )))
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arr[0] = 0;
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return arr;
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}
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int
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arrLen( char **arr )
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{
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int nu = 0;
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if (arr)
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for (; arr[nu]; nu++);
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return nu;
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}
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static char **
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extStrArr( char **arr, char ***strp )
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{
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char **rarr;
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int nu;
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nu = arrLen( arr );
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if ((rarr = Realloc( arr, sizeof(char *) * (nu + 2) ))) {
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rarr[nu + 1] = 0;
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*strp = rarr + nu;
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return rarr;
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}
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freeStrArr( arr );
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return 0;
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}
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char **
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addStrArr( char **arr, const char *str, int len )
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{
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char **strp;
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if ((arr = extStrArr( arr, &strp ))) {
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if (StrNDup( strp, str, len ))
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return arr;
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freeStrArr( arr );
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}
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return 0;
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}
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char **
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xCopyStrArr( int rn, char **arr )
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{
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char **rarr;
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int nu;
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nu = arrLen( arr );
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if ((rarr = Calloc( sizeof(char *), nu + rn + 1 )))
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memcpy( rarr + rn, arr, sizeof(char *) * nu );
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return rarr;
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}
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void
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freeStrArr( char **arr )
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{
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char **a;
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if (arr) {
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for (a = arr; *a; a++)
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free( *a );
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free( arr );
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}
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}
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char **
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parseArgs( char **argv, const char *string )
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{
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const char *word;
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char **strp, *str;
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int wlen;
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if (!(argv = initStrArr( argv )))
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return 0;
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while (*string) {
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if (isspace( *string )) {
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string++;
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continue;
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}
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word = string;
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wlen = 0;
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do {
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if (*string == '\\') {
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if (!*++string)
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string--;
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wlen++;
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} else if (*string == '\'') {
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while (*++string != '\'' && *string)
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wlen++;
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} else if (*string == '"') {
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while (*++string != '"' && *string) {
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if (*string == '\\') {
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if (!*++string)
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string--;
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}
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wlen++;
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}
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} else
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wlen++;
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} while (*++string && !isspace( *string ));
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if (!(argv = extStrArr( argv, &strp )))
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return 0;
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if (!(*strp = str = Malloc( wlen + 1 ))) {
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freeStrArr( argv );
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return 0;
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}
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do {
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if (*word == '\\') {
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if (!*++word)
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word--;
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*str++ = *word;
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} else if (*word == '\'') {
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while (*++word != '\'' && *word)
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*str++ = *word;
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} else if (*word == '"') {
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while (*++word != '"' && *word) {
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if (*word == '\\') {
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if (!*++word)
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word--;
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}
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*str++ = *word;
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}
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} else
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*str++ = *word;
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} while (*++word && !isspace( *word ));
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*str = 0;
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}
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return argv;
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}
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const char *
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getEnv( char **e, const char *name )
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{
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if (e) {
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int l = strlen( name );
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for (; *e; e++)
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if (!memcmp( *e, name, l ) && (*e)[l] == '=')
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return (*e) + l + 1;
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}
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return 0;
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}
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char **
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setEnv( char **e, const char *name, const char *value )
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{
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char **new, **old;
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char *newe;
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int envsize;
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int l;
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#ifdef _AIX
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/* setpenv() depends on "SYSENVIRON:", not "SYSENVIRON:=" */
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if (!value) {
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if (!StrDup( &newe, name ))
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return e;
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} else
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#endif
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{
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newe = 0;
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if (!StrApp( &newe, name, "=", value, (char *)0 ))
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return e;
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}
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envsize = 0;
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if (e) {
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l = strlen( name );
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for (old = e; *old; old++)
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if (!memcmp( *old, name, l ) && ((*old)[l] == '=' || !(*old)[l]))
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{
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free( *old );
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*old = newe;
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return e;
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}
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envsize = old - e;
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}
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if (!(new = (char **)
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Realloc( (char *)e, (unsigned)((envsize + 2) * sizeof(char *)) )))
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{
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free( newe );
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return e;
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}
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new[envsize] = newe;
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new[envsize + 1] = 0;
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return new;
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}
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char **
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putEnv( const char *string, char **env )
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{
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char *n;
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char *b;
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if (!(b = strchr( string, '=' )))
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return NULL;
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if (!StrNDup( &n, string, b - string ))
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return NULL;
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env = setEnv( env, n, b + 1 );
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free( n );
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return env;
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}
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static int
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GetHostname( char *buf, int maxlen )
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{
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int len;
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#ifdef NEED_UTSNAME
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/*
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* same host name crock as in server and xinit.
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*/
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struct utsname name;
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uname( &name );
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len = strlen( name.nodename );
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if (len >= maxlen) len = maxlen - 1;
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memcpy( buf, name.nodename, len );
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buf[len] = '\0';
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#else
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buf[0] = '\0';
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(void)gethostname( buf, maxlen );
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buf[maxlen - 1] = '\0';
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len = strlen( buf );
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#endif /* NEED_UTSNAME */
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return len;
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}
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static char localHostbuf[256];
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static int gotLocalHostname;
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const char *
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localHostname( void )
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{
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if (!gotLocalHostname)
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{
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GetHostname( localHostbuf, sizeof(localHostbuf) - 1 );
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gotLocalHostname = 1;
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}
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return localHostbuf;
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}
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static int
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AtomicIO( ssize_t (*f)( int, void *, size_t ), int fd, void *buf, int count )
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{
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int ret, rlen;
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for (rlen = 0; rlen < count; ) {
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dord:
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ret = f( fd, (void *)((char *)buf + rlen), count - rlen );
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if (ret < 0) {
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if (errno == EINTR)
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goto dord;
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if (errno == EAGAIN)
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break;
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return -1;
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}
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if (!ret)
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break;
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rlen += ret;
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}
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return rlen;
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}
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int
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Reader( int fd, void *buf, int count )
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{
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return AtomicIO( read, fd, buf, count );
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}
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int
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Writer( int fd, const void *buf, int count )
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{
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return AtomicIO( (ssize_t(*)( int, void *, size_t ))write,
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fd, (void *)buf, count );
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}
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|
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int
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fGets( char *buf, int max, FILE *f )
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{
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int len;
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if (!fgets( buf, max, f ))
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return -1;
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len = strlen( buf );
|
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if (len && buf[len - 1] == '\n')
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buf[--len] = 0;
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return len;
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}
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|
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time_t
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mTime( const char *fn )
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{
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struct stat st;
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|
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if (stat( fn, &st ))
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return -1;
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else
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return st.st_mtime;
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}
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|
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void
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randomStr( char *s )
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{
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static const char letters[] =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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unsigned i, rn = secureRandom();
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for (i = 0; i < 6; i++) {
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*s++ = letters[rn % 62];
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rn /= 62;
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}
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*s = 0;
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}
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|
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static int
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StrNChrCnt( const char *s, int slen, char c )
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|
{
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int i, cnt;
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for (i = cnt = 0; i < slen && s[i]; i++)
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if (s[i] == c)
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cnt++;
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return cnt;
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}
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|
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/* X -from ip6-addr does not work here, so i don't know whether this is needed.
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#define IP6_MAGIC
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*/
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|
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void
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ListSessions( int flags, struct display *d, void *ctx,
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void (*emitXSess)( struct display *, struct display *, void * ),
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|
void (*emitTTYSess)( STRUCTUTMP *, struct display *, void * ) )
|
|
{
|
|
struct display *di;
|
|
#ifdef IP6_MAGIC
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int le, dot;
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#endif
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|
#ifdef BSD_UTMP
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|
int fd;
|
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struct utmp ut[1];
|
|
#else
|
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STRUCTUTMP *ut;
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#endif
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|
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for (di = displays; di; di = di->next)
|
|
if (((flags & lstRemote) || (di->displayType & d_location) == dLocal) &&
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(di->status == remoteLogin ||
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((flags & lstPassive) ? di->status == running : di->userSess >= 0)))
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emitXSess( di, d, ctx );
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|
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if (!(flags & lstTTY))
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return;
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|
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#ifdef BSD_UTMP
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if ((fd = open( UTMP_FILE, O_RDONLY )) < 0)
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|
return;
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while (Reader( fd, ut, sizeof(ut[0]) ) == sizeof(ut[0])) {
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|
if (*ut->ut_user) { /* no idea how to list passive TTYs on BSD */
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|
#else
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|
SETUTENT();
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|
while ((ut = GETUTENT())) {
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if (ut->ut_type == USER_PROCESS
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# if 0 /* list passive TTYs at all? not too sensible, i think. */
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|
|| ((flags & lstPassive) && ut->ut_type == LOGIN_PROCESS)
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# endif
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)
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{
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#endif
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if (*ut->ut_host) { /* from remote or x */
|
|
if (!(flags & lstRemote))
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continue;
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} else {
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|
/* hack around broken konsole which does not set ut_host. */
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|
/* this check is probably linux-specific. */
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|
/* alternatively we could open the device and try VT_OPENQRY. */
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|
if (memcmp( ut->ut_line, "tty", 3 ) ||
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!isdigit( ut->ut_line[3] ))
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continue;
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|
}
|
|
if (StrNChrCnt( ut->ut_line, sizeof(ut->ut_line), ':' ))
|
|
continue; /* x login */
|
|
switch (StrNChrCnt( ut->ut_host, sizeof(ut->ut_host), ':' )) {
|
|
case 1: /* x terminal */
|
|
continue;
|
|
default:
|
|
#ifdef IP6_MAGIC
|
|
/* unknown - IPv6 makes things complicated */
|
|
le = StrNLen( ut->ut_host, sizeof(ut->ut_host) );
|
|
/* cut off screen number */
|
|
for (dot = le; ut->ut_host[--dot] != ':'; )
|
|
if (ut->ut_host[dot] == '.') {
|
|
le = dot;
|
|
break;
|
|
}
|
|
for (di = displays; di; di = di->next)
|
|
if (!memcmp( di->name, ut->ut_host, le ) && !di->name[le])
|
|
goto cont; /* x terminal */
|
|
break;
|
|
cont:
|
|
continue;
|
|
case 0: /* no x terminal */
|
|
#endif
|
|
break;
|
|
}
|
|
emitTTYSess( ut, d, ctx );
|
|
}
|
|
}
|
|
#ifdef BSD_UTMP
|
|
close( fd );
|
|
#else
|
|
ENDUTENT();
|
|
#endif
|
|
}
|
|
|