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tdebase/kdm/kfrontend/kdm_config.c

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/*
Read options from kdmrc
Copyright (C) 2001-2005 Oswald Buddenhagen <ossi@kde.org>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <grp.h>
#ifdef _POSIX_PRIORITY_SCHEDULING
# include <sched.h>
#endif
#include <X11/X.h>
#ifdef FamilyInternet6
# define IPv6
#endif
#include <greet.h>
#include <config.ci>
/*
* Section/Entry definition structs
*/
typedef struct Ent {
const char *name;
int id;
void *ptr;
const char *def;
} Ent;
typedef struct Sect {
const char *name;
Ent *ents;
int numents;
} Sect;
/*
* Parsed ini file structs
*/
typedef struct Entry {
struct Entry *next;
const char *val;
Ent *ent;
int vallen;
int line;
} Entry;
typedef struct Section {
struct Section *next;
Entry *entries;
Sect *sect;
const char *name, *dname, *dhost, *dnum, *dclass;
int nlen, dlen, dhostl, dnuml, dclassl;
} Section;
/*
* Split up display-name/-class for fast comparison
*/
typedef struct DSpec {
const char *dhost, *dnum, *dclass;
int dhostl, dnuml, dclassl;
} DSpec;
/*
* Config value storage structures
*/
typedef struct Value {
const char *ptr;
int len;
} Value;
typedef struct Val {
Value val;
int id;
} Val;
typedef struct ValArr {
Val *ents;
int nents, esiz, nchars, nptrs;
} ValArr;
static void *Malloc( size_t size );
static void *Realloc( void *ptr, size_t size );
#define PRINT_QUOTES
#define LOG_NAME "kdm_config"
#define LOG_DEBUG_MASK DEBUG_CONFIG
#define LOG_PANIC_EXIT 1
#define STATIC static
#include <printf.c>
static void *
Malloc( size_t size )
{
void *ret;
if (!(ret = malloc( size )))
LogOutOfMem();
return ret;
}
static void *
Realloc( void *ptr, size_t size )
{
void *ret;
if (!(ret = realloc( ptr, size )) && size)
LogOutOfMem();
return ret;
}
static void
MkDSpec( DSpec *spec, const char *dname, const char *dclass )
{
spec->dhost = dname;
for (spec->dhostl = 0; dname[spec->dhostl] != ':'; spec->dhostl++);
spec->dnum = dname + spec->dhostl + 1;
spec->dnuml = strlen( spec->dnum );
spec->dclass = dclass;
spec->dclassl = strlen( dclass );
}
static int rfd, wfd;
static int
Reader( void *buf, int count )
{
int ret, rlen;
for (rlen = 0; rlen < count; ) {
dord:
ret = read( rfd, (void *)((char *)buf + rlen), count - rlen );
if (ret < 0) {
if (errno == EINTR)
goto dord;
if (errno == EAGAIN)
break;
return -1;
}
if (!ret)
break;
rlen += ret;
}
return rlen;
}
static void
GRead( void *buf, int count )
{
if (Reader( buf, count ) != count)
LogPanic( "Can't read from core\n" );
}
static void
GWrite( const void *buf, int count )
{
if (write( wfd, buf, count ) != count)
LogPanic( "Can't write to core\n" );
#ifdef _POSIX_PRIORITY_SCHEDULING
if ((debugLevel & DEBUG_HLPCON))
sched_yield();
#endif
}
static void
GSendInt( int val )
{
GWrite( &val, sizeof(val) );
}
static void
GSendStr( const char *buf )
{
if (buf) {
int len = strlen( buf ) + 1;
GWrite( &len, sizeof(len) );
GWrite( buf, len );
} else
GWrite( &buf, sizeof(int));
}
static void
GSendNStr( const char *buf, int len )
{
int tlen = len + 1;
GWrite( &tlen, sizeof(tlen) );
GWrite( buf, len );
GWrite( "", 1 );
}
#ifdef XDMCP
static void
GSendArr( int len, const char *data )
{
GWrite( &len, sizeof(len) );
GWrite( data, len );
}
#endif
static int
GRecvCmd( int *val )
{
if (Reader( val, sizeof(*val) ) != sizeof(*val))
return 0;
return 1;
}
static int
GRecvInt()
{
int val;
GRead( &val, sizeof(val) );
return val;
}
static char *
GRecvStr()
{
int len;
char *buf;
len = GRecvInt();
if (!len)
return 0;
if (!(buf = malloc( len )))
LogPanic( "No memory for read buffer" );
GRead( buf, len );
return buf;
}
/* #define WANT_CLOSE 1 */
typedef struct File {
char *buf, *eof, *cur;
#if defined(HAVE_MMAP) && defined(WANT_CLOSE)
int ismapped;
#endif
} File;
static int
readFile( File *file, const char *fn, const char *what )
{
int fd;
off_t flen;
if ((fd = open( fn, O_RDONLY )) < 0) {
LogInfo( "Cannot open %s file %s\n", what, fn );
return 0;
}
flen = lseek( fd, 0, SEEK_END );
#ifdef HAVE_MMAP
# ifdef WANT_CLOSE
file->ismapped = 0;
# endif
file->buf = mmap( 0, flen + 1, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0 );
# ifdef WANT_CLOSE
if (file->buf)
file->ismapped = 1;
else
# else
if (!file->buf)
# endif
#endif
{
if (!(file->buf = Malloc( flen + 1 ))) {
close( fd );
return 0;
}
lseek( fd, 0, SEEK_SET );
if (read( fd, file->buf, flen ) != flen) {
free( file->buf );
LogError( "Cannot read %s file %s\n", what, fn );
close( fd );
return 0;
}
}
file->eof = (file->cur = file->buf) + flen;
close( fd );
return 1;
}
#ifdef WANT_CLOSE
static void
freeBuf( File *file )
{
# ifdef HAVE_MMAP
if (file->ismapped)
munmap( file->buf, file->eof - file->buf + 1 );
else
# endif
free( file->buf );
}
#endif
CONF_READ_VARS
#define C_MTYPE_MASK 0x30000000
# define C_PATH 0x10000000 /* C_TYPE_STR is a path spec */
# define C_BOOL 0x10000000 /* C_TYPE_INT is a boolean */
# define C_ENUM 0x20000000 /* C_TYPE_INT is an enum (option) */
# define C_GRP 0x30000000 /* C_TYPE_INT is a group spec */
#define C_INTERNAL 0x40000000 /* don't expose to core */
#define C_CONFIG 0x80000000 /* process only for finding deps */
#ifdef XDMCP
static int
PrequestPort( Value *retval )
{
if (!VxdmcpEnable.ptr) {
retval->ptr = (char *)0;
return 1;
}
return 0;
}
#endif
static Value
emptyStr = { "", 1 },
nullValue = { 0, 0 },
emptyArgv = { (char *)&nullValue, 0 };
static int
PnoPassUsers( Value *retval )
{
if (!VnoPassEnable.ptr) {
*retval = emptyArgv;
return 1;
}
return 0;
}
static int
PautoLoginX( Value *retval )
{
if (!VautoLoginEnable.ptr) {
*retval = emptyStr;
return 1;
}
return 0;
}
CONF_READ_ENTRIES
static const char *kdmrc = KDMCONF "/kdmrc";
static Section *rootsec;
static void
ReadConf()
{
const char *nstr, *dstr, *cstr, *dhost, *dnum, *dclass;
char *s, *e, *st, *en, *ek, *sl, *pt;
Section *cursec;
Entry *curent;
Ent *ce;
int nlen, dlen, clen, dhostl, dnuml, dclassl;
int i, line, sectmoan, restl;
File file;
static int confread;
if (confread)
return;
confread = 1;
Debug( "reading config %s ...\n", kdmrc );
if (!readFile( &file, kdmrc, "master configuration" ))
return;
for (s = file.buf, line = 0, cursec = 0, sectmoan = 1; s < file.eof; s++) {
line++;
while ((s < file.eof) && isspace( *s ) && (*s != '\n'))
s++;
if ((s < file.eof) && ((*s == '\n') || (*s == '#'))) {
sktoeol:
while ((s < file.eof) && (*s != '\n'))
s++;
continue;
}
sl = s;
if (*s == '[') {
sectmoan = 0;
while ((s < file.eof) && (*s != '\n'))
s++;
e = s - 1;
while ((e > sl) && isspace( *e ))
e--;
if (*e != ']') {
cursec = 0;
LogError( "Invalid section header at %s:%d\n", kdmrc, line );
continue;
}
nstr = sl + 1;
nlen = e - nstr;
for (cursec = rootsec; cursec; cursec = cursec->next)
if (nlen == cursec->nlen &&
!memcmp( nstr, cursec->name, nlen ))
{
LogInfo( "Multiple occurrences of section [%.*s] in %s. "
"Consider merging them.\n", nlen, nstr, kdmrc );
goto secfnd;
}
if (nstr[0] == 'X' && nstr[1] == '-') {
cstr = nstr + nlen;
clen = 0;
while (++clen, *--cstr != '-');
if (cstr == nstr + 1)
goto illsec;
dstr = nstr + 2;
dlen = nlen - clen - 2;
dhost = dstr;
dhostl = 0;
for (restl = dlen; restl; restl--) {
if (dhost[dhostl] == ':') {
dnum = dhost + dhostl + 1;
dnuml = 0;
for (restl--; restl; restl--) {
if (dnum[dnuml] == '_') {
dclass = dnum + dnuml + 1;
dclassl = restl;
goto gotall;
}
dnuml++;
}
goto gotnum;
}
dhostl++;
}
dnum = "*";
dnuml = 1;
gotnum:
dclass = "*";
dclassl = 1;
gotall: ;
} else {
if (nstr[0] == '-')
goto illsec;
dstr = 0;
dlen = 0;
dhost = 0;
dhostl = 0;
dnum = 0;
dnuml = 0;
dclass = 0;
dclassl = 0;
cstr = nstr;
clen = nlen;
}
for (i = 0; i < as(allSects); i++)
if ((int)strlen( allSects[i]->name ) == clen &&
!memcmp( allSects[i]->name, cstr, clen ))
goto newsec;
illsec:
cursec = 0;
LogError( "Unrecognized section name [%.*s] at %s:%d\n",
nlen, nstr, kdmrc, line );
continue;
newsec:
if (!(cursec = Malloc( sizeof(*cursec) )))
return;
cursec->name = nstr;
cursec->nlen = nlen;
cursec->dname = dstr;
cursec->dlen = dlen;
cursec->dhost = dhost;
cursec->dhostl = dhostl;
cursec->dnum = dnum;
cursec->dnuml = dnuml;
cursec->dclass = dclass;
cursec->dclassl = dclassl;
cursec->sect = allSects[i];
cursec->entries = 0;
cursec->next = rootsec;
rootsec = cursec;
/*Debug( "now in section [%.*s], dpy '%.*s', core '%.*s'\n",
nlen, nstr, dlen, dstr, clen, cstr );*/
secfnd:
continue;
}
if (!cursec) {
if (sectmoan) {
sectmoan = 0;
LogError( "Entry outside any section at %s:%d", kdmrc, line );
}
goto sktoeol;
}
for (; (s < file.eof) && (*s != '\n'); s++)
if (*s == '=')
goto haveeq;
LogError( "Invalid entry (missing '=') at %s:%d\n", kdmrc, line );
continue;
haveeq:
for (ek = s - 1; ; ek--) {
if (ek < sl) {
LogError( "Invalid entry (empty key) at %s:%d\n", kdmrc, line );
goto sktoeol;
}
if (!isspace( *ek ))
break;
}
s++;
while ((s < file.eof) && isspace( *s ) && (*s != '\n'))
s++;
for (pt = st = en = s; s < file.eof && *s != '\n'; s++) {
if (*s == '\\') {
s++;
if (s >= file.eof || *s == '\n') {
LogError( "Trailing backslash at %s:%d\n", kdmrc, line );
break;
}
switch (*s) {
case 's': *pt++ = ' '; break;
case 't': *pt++ = '\t'; break;
case 'n': *pt++ = '\n'; break;
case 'r': *pt++ = '\r'; break;
case '\\': *pt++ = '\\'; break;
default: *pt++ = '\\'; *pt++ = *s; break;
}
en = pt;
} else {
*pt++ = *s;
if (*s != ' ' && *s != '\t')
en = pt;
}
}
nstr = sl;
nlen = ek - sl + 1;
/*Debug( "read entry '%.*s'='%.*s'\n", nlen, nstr, en - st, st );*/
for (i = 0; i < cursec->sect->numents; i++) {
ce = cursec->sect->ents + i;
if ((int)strlen( ce->name ) == nlen &&
!memcmp( ce->name, nstr, nlen ))
goto keyok;
}
LogError( "Unrecognized key '%.*s' in section [%.*s] at %s:%d\n",
nlen, nstr, cursec->nlen, cursec->name, kdmrc, line );
continue;
keyok:
for (curent = cursec->entries; curent; curent = curent->next)
if (ce == curent->ent) {
LogError( "Multiple occurrences of key '%s' in section [%.*s]"
" of %s\n",
ce->name, cursec->nlen, cursec->name, kdmrc );
goto keyfnd;
}
if (!(curent = Malloc( sizeof(*curent) )))
return;
curent->ent = ce;
curent->line = line;
curent->val = st;
curent->vallen = en - st;
curent->next = cursec->entries;
cursec->entries = curent;
keyfnd:
continue;
}
}
static Entry *
FindGEnt( int id )
{
Section *cursec;
Entry *curent;
for (cursec = rootsec; cursec; cursec = cursec->next)
if (!cursec->dname)
for (curent = cursec->entries; curent; curent = curent->next)
if (curent->ent->id == id) {
Debug( "line %d: %s = %'.*s\n",
curent->line, curent->ent->name,
curent->vallen, curent->val );
return curent;
}
return 0;
}
/* Display name match scoring:
* - class (any/exact) -> 0/1
* - number (any/exact) -> 0/2
* - host (any/nonempty/trail/exact) -> 0/4/8/12
*/
static Entry *
FindDEnt( int id, DSpec *dspec )
{
Section *cursec, *bestsec;
Entry *curent, *bestent;
int score, bestscore;
bestscore = -1, bestent = 0;
for (cursec = rootsec; cursec; cursec = cursec->next)
if (cursec->dname) {
score = 0;
if (cursec->dclassl != 1 || cursec->dclass[0] != '*') {
if (cursec->dclassl == dspec->dclassl &&
!memcmp( cursec->dclass, dspec->dclass, dspec->dclassl ))
score = 1;
else
continue;
}
if (cursec->dnuml != 1 || cursec->dnum[0] != '*') {
if (cursec->dnuml == dspec->dnuml &&
!memcmp( cursec->dnum, dspec->dnum, dspec->dnuml ))
score += 2;
else
continue;
}
if (cursec->dhostl != 1 || cursec->dhost[0] != '*') {
if (cursec->dhostl == 1 && cursec->dhost[0] == '+') {
if (dspec->dhostl)
score += 4;
else
continue;
} else if (cursec->dhost[0] == '.') {
if (cursec->dhostl < dspec->dhostl &&
!memcmp( cursec->dhost,
dspec->dhost + dspec->dhostl - cursec->dhostl,
cursec->dhostl ))
score += 8;
else
continue;
} else {
if (cursec->dhostl == dspec->dhostl &&
!memcmp( cursec->dhost, dspec->dhost, dspec->dhostl ))
score += 12;
else
continue;
}
}
if (score > bestscore) {
for (curent = cursec->entries; curent; curent = curent->next)
if (curent->ent->id == id) {
bestent = curent;
bestsec = cursec;
bestscore = score;
break;
}
}
}
if (bestent)
Debug( "line %d: %.*s:%.*s_%.*s/%s = %'.*s\n", bestent->line,
bestsec->dhostl, bestsec->dhost,
bestsec->dnuml, bestsec->dnum,
bestsec->dclassl, bestsec->dclass,
bestent->ent->name, bestent->vallen, bestent->val );
return bestent;
}
static const char *
CvtValue( Ent *et, Value *retval, int vallen, const char *val, char **eopts )
{
Value *ents;
int i, b, e, tlen, nents, esiz;
char buf[80];
switch (et->id & C_TYPE_MASK) {
case C_TYPE_INT:
for (i = 0; i < vallen && i < (int)sizeof(buf) - 1; i++)
buf[i] = tolower( val[i] );
buf[i] = 0;
if ((et->id & C_MTYPE_MASK) == C_BOOL) {
if (!strcmp( buf, "true" ) ||
!strcmp( buf, "on" ) ||
!strcmp( buf, "yes" ) ||
!strcmp( buf, "1" ))
retval->ptr = (char *)1;
else if (!strcmp( buf, "false" ) ||
!strcmp( buf, "off" ) ||
!strcmp( buf, "no" ) ||
!strcmp( buf, "0" ))
retval->ptr = (char *)0;
else
return "boolean";
return 0;
} else if ((et->id & C_MTYPE_MASK) == C_ENUM) {
for (i = 0; eopts[i]; i++)
if (!memcmp( eopts[i], val, vallen ) && !eopts[i][vallen]) {
retval->ptr = (char *)i;
return 0;
}
return "option";
} else if ((et->id & C_MTYPE_MASK) == C_GRP) {
struct group *ge;
if ((ge = getgrnam( buf ))) {
retval->ptr = (char *)ge->gr_gid;
return 0;
}
}
retval->ptr = 0;
if (sscanf( buf, "%li", &retval->ptr ) != 1)
return "integer";
return 0;
case C_TYPE_STR:
retval->ptr = val;
retval->len = vallen + 1;
if ((et->id & C_MTYPE_MASK) == C_PATH)
if (vallen && val[vallen-1] == '/')
retval->len--;
return 0;
case C_TYPE_ARGV:
if (!(ents = Malloc( sizeof(Value) * (esiz = 10) )))
return 0;
for (nents = 0, tlen = 0, i = 0; ; i++) {
for (; i < vallen && isspace( val[i] ); i++);
for (b = i; i < vallen && val[i] != ','; i++);
if (b == i)
break;
for (e = i; e > b && isspace( val[e - 1] ); e--);
if (esiz < nents + 2) {
Value *entsn = Realloc( ents,
sizeof(Value) * (esiz = esiz * 2 + 1) );
if (!nents)
break;
ents = entsn;
}
ents[nents].ptr = val + b;
ents[nents].len = e - b;
nents++;
tlen += e - b + 1;
}
ents[nents].ptr = 0;
retval->ptr = (char *)ents;
retval->len = tlen;
return 0;
default:
LogError( "Internal error: unknown value type in id %#x\n", et->id );
return 0;
}
}
static void
GetValue( Ent *et, DSpec *dspec, Value *retval, char **eopts )
{
Entry *ent;
const char *errs;
/* Debug( "Getting value %#x\n", et->id );*/
if (dspec)
ent = FindDEnt( et->id, dspec );
else
ent = FindGEnt( et->id );
if (ent) {
if (!(errs = CvtValue( et, retval, ent->vallen, ent->val, eopts )))
return;
LogError( "Invalid %s value '%.*s' at %s:%d\n",
errs, ent->vallen, ent->val, kdmrc, ent->line );
}
Debug( "default: %s = %'s\n", et->name, et->def );
if ((errs = CvtValue( et, retval, strlen( et->def ), et->def, eopts )))
LogError( "Internal error: invalid default %s value '%s' for key %s\n",
errs, et->def, et->name );
}
static int
AddValue( ValArr *va, int id, Value *val )
{
int nu;
/* Debug( "Addig value %#x\n", id );*/
if (va->nents == va->esiz) {
va->ents = Realloc( va->ents, sizeof(Val) * (va->esiz += 50) );
if (!va->ents)
return 0;
}
va->ents[va->nents].id = id;
va->ents[va->nents].val = *val;
va->nents++;
switch (id & C_TYPE_MASK) {
case C_TYPE_INT:
break;
case C_TYPE_STR:
va->nchars += val->len;
break;
case C_TYPE_ARGV:
va->nchars += val->len;
for (nu = 0; ((Value *)val->ptr)[nu++].ptr; );
va->nptrs += nu;
break;
}
return 1;
}
static void
CopyValues( ValArr *va, Sect *sec, DSpec *dspec, int isconfig )
{
Value val;
int i;
Debug( "getting values for section class [%s]\n", sec->name );
for (i = 0; i < sec->numents; i++) {
/*Debug ("value %#x\n", sec->ents[i].id);*/
if ((sec->ents[i].id & (int)C_CONFIG) != isconfig)
;
else if (sec->ents[i].id & C_INTERNAL) {
GetValue( sec->ents + i, dspec, ((Value *)sec->ents[i].ptr), 0 );
} else {
if (((sec->ents[i].id & C_MTYPE_MASK) == C_ENUM) ||
!sec->ents[i].ptr ||
!((int (*)( Value * ))sec->ents[i].ptr)(&val)) {
GetValue( sec->ents + i, dspec, &val,
(char **)sec->ents[i].ptr );
}
if (!AddValue( va, sec->ents[i].id, &val ))
break;
}
}
return;
}
static void
SendValues( ValArr *va )
{
Value *cst;
int i, nu;
GSendInt( va->nents );
GSendInt( va->nptrs );
GSendInt( 0/*va->nints*/ );
GSendInt( va->nchars );
for (i = 0; i < va->nents; i++) {
GSendInt( va->ents[i].id & ~C_PRIVATE );
switch (va->ents[i].id & C_TYPE_MASK) {
case C_TYPE_INT:
GSendInt( (int)va->ents[i].val.ptr );
break;
case C_TYPE_STR:
GSendNStr( va->ents[i].val.ptr, va->ents[i].val.len - 1 );
break;
case C_TYPE_ARGV:
cst = (Value *)va->ents[i].val.ptr;
for (nu = 0; cst[nu].ptr; nu++);
GSendInt( nu );
for (; cst->ptr; cst++)
GSendNStr( cst->ptr, cst->len );
break;
}
}
}
#ifdef XDMCP
static char *
ReadWord( File *file, int *len, int EOFatEOL )
{
char *wordp, *wordBuffer;
int quoted;
char c;
rest:
wordp = wordBuffer = file->cur;
mloop:
quoted = 0;
qloop:
if (file->cur == file->eof) {
doeow:
if (wordp == wordBuffer)
return 0;
retw:
*wordp = '\0';
*len = wordp - wordBuffer;
return wordBuffer;
}
c = *file->cur++;
switch (c) {
case '#':
if (quoted)
break;
do {
if (file->cur == file->eof)
goto doeow;
c = *file->cur++;
} while (c != '\n');
case '\0':
case '\n':
if (EOFatEOL && !quoted) {
file->cur--;
goto doeow;
}
if (wordp != wordBuffer) {
file->cur--;
goto retw;
}
goto rest;
case ' ':
case '\t':
if (wordp != wordBuffer)
goto retw;
goto rest;
case '\\':
if (!quoted) {
quoted = 1;
goto qloop;
}
break;
}
*wordp++ = c;
goto mloop;
}
#define ALIAS_CHARACTER '%'
#define EQUAL_CHARACTER '='
#define NEGATE_CHARACTER '!'
#define CHOOSER_STRING "CHOOSER"
#define BROADCAST_STRING "BROADCAST"
#define NOBROADCAST_STRING "NOBROADCAST"
#define LISTEN_STRING "LISTEN"
#define WILDCARD_STRING "*"
typedef struct hostEntry {
struct hostEntry *next;
int type;
union _hostOrAlias {
char *aliasPattern;
char *hostPattern;
struct _display {
int connectionType;
int hostAddrLen;
char *hostAddress;
} displayAddress;
} entry;
} HostEntry;
typedef struct listenEntry {
struct listenEntry *next;
int iface;
int mcasts;
int nmcasts;
} ListenEntry;
typedef struct aliasEntry {
struct aliasEntry *next;
char *name;
HostEntry **pHosts;
int hosts;
int nhosts;
int hasBad;
} AliasEntry;
typedef struct aclEntry {
struct aclEntry *next;
HostEntry **pEntries;
int entries;
int nentries;
HostEntry **pHosts;
int hosts;
int nhosts;
int flags;
} AclEntry;
static int
HasGlobCharacters( char *s )
{
for (;;)
switch (*s++) {
case '?':
case '*':
return 1;
case '\0':
return 0;
}
}
#define PARSE_ALL 0
#define PARSE_NO_BCAST 1
#define PARSE_NO_PAT 2
#define PARSE_NO_ALIAS 4
static int
ParseHost( int *nHosts, HostEntry ***hostPtr, int *nChars,
char *hostOrAlias, int len, int parse )
{
#if defined(IPv6) && defined(AF_INET6)
struct addrinfo *ai;
#else
struct hostent *hostent;
#endif
void *addr;
int addr_type, addr_len;
if (!(**hostPtr = (HostEntry *)Malloc( sizeof(HostEntry))))
return 0;
if (!(parse & PARSE_NO_BCAST) && !strcmp( hostOrAlias, BROADCAST_STRING ))
{
(**hostPtr)->type = HOST_BROADCAST;
}
else if (!(parse & PARSE_NO_ALIAS) && *hostOrAlias == ALIAS_CHARACTER)
{
(**hostPtr)->type = HOST_ALIAS;
(**hostPtr)->entry.aliasPattern = hostOrAlias + 1;
*nChars += len;
}
else if (!(parse & PARSE_NO_PAT) && HasGlobCharacters( hostOrAlias ))
{
(**hostPtr)->type = HOST_PATTERN;
(**hostPtr)->entry.hostPattern = hostOrAlias;
*nChars += len + 1;
}
else
{
(**hostPtr)->type = HOST_ADDRESS;
#if defined(IPv6) && defined(AF_INET6)
if (getaddrinfo( hostOrAlias, NULL, NULL, &ai ))
#else
if (!(hostent = gethostbyname( hostOrAlias )))
#endif
{
LogWarn( "XDMCP ACL: unresolved host %'s\n", hostOrAlias );
free( (char *)(**hostPtr) );
return 0;
}
#if defined(IPv6) && defined(AF_INET6)
addr_type = ai->ai_addr->sa_family;
if (ai->ai_family == AF_INET) {
addr = &((struct sockaddr_in *)ai->ai_addr)->sin_addr;
addr_len = sizeof(struct in_addr);
} else /*if (ai->ai_addr->sa_family == AF_INET6)*/ {
addr = &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
addr_len = sizeof(struct in6_addr);
}
#else
addr_type = hostent->h_addrtype;
addr = hostent->h_addr;
addr_len = hostent->h_length;
#endif
if (!((**hostPtr)->entry.displayAddress.hostAddress =
Malloc( addr_len )))
{
#if defined(IPv6) && defined(AF_INET6)
freeaddrinfo( ai );
#endif
free( (char *)(**hostPtr) );
return 0;
}
memcpy( (**hostPtr)->entry.displayAddress.hostAddress, addr, addr_len );
*nChars += addr_len;
(**hostPtr)->entry.displayAddress.hostAddrLen = addr_len;
(**hostPtr)->entry.displayAddress.connectionType = addr_type;
#if defined(IPv6) && defined(AF_INET6)
freeaddrinfo( ai );
#endif
}
*hostPtr = &(**hostPtr)->next;
(*nHosts)++;
return 1;
}
/* Returns non-0 if string is matched by pattern. Does case folding. */
static int
patternMatch( const char *string, const char *pattern )
{
int p, s;
if (!string)
string = "";
for (;;) {
s = *string++;
switch (p = *pattern++) {
case '*':
if (!*pattern)
return 1;
for (string--; *string; string++)
if (patternMatch( string, pattern ))
return 1;
return 0;
case '?':
if (s == '\0')
return 0;
break;
case '\0':
return s == '\0';
case '\\':
p = *pattern++;
/* fall through */
default:
if (tolower( p ) != tolower( s ))
return 0;
}
}
}
#define MAX_DEPTH 32
#define CHECK_NOT 1
#define CHECK_NO_PAT 2
static int
checkHostlist( HostEntry **hosts, int nh, AliasEntry *aliases, int na,
int depth, int flags )
{
HostEntry *h;
AliasEntry *a;
int hn, an, am;
for (h = *hosts, hn = 0; hn < nh; hn++, h = h->next)
if (h->type == HOST_ALIAS) {
if (depth == MAX_DEPTH) {
LogError( "XDMCP ACL: alias recursion involving %%%s\n",
h->entry.aliasPattern );
return 1;
}
for (a = aliases, an = 0, am = 0; an < na; an++, a = a->next)
if (patternMatch( a->name, h->entry.aliasPattern )) {
am = 1;
if ((flags & CHECK_NOT) && a->hasBad) {
LogError( "XDMCP ACL: alias %%%s with unresolved hosts "
"in denying rule\n", a->name );
return 1;
}
if (checkHostlist( a->pHosts, a->nhosts, aliases, na,
depth + 1, flags ))
return 1;
}
if (!am) {
if (flags & CHECK_NOT) {
LogError( "XDMCP ACL: unresolved alias pattern %%%s "
"in denying rule\n", h->entry.aliasPattern );
return 1;
} else
LogWarn( "XDMCP ACL: unresolved alias pattern %%%s\n",
h->entry.aliasPattern );
}
} else if (h->type == HOST_PATTERN && (flags & CHECK_NO_PAT))
LogWarn( "XDMCP ACL: wildcarded pattern %'s in host-only context\n",
h->entry.hostPattern );
return 0;
}
static void
ReadAccessFile( const char *fname )
{
HostEntry *hostList, **hostPtr = &hostList;
AliasEntry *aliasList, **aliasPtr = &aliasList;
AclEntry *acList, **acPtr = &acList, *acl;
ListenEntry *listenList, **listenPtr = &listenList;
char *displayOrAlias, *hostOrAlias;
File file;
int nHosts, nAliases, nAcls, nListens, nChars, error, bad;
int i, len;
nHosts = nAliases = nAcls = nListens = nChars = error = 0;
if (!readFile( &file, fname, "XDMCP access control" ))
goto sendacl;
while ((displayOrAlias = ReadWord( &file, &len, FALSE ))) {
if (*displayOrAlias == ALIAS_CHARACTER)
{
if (!(*aliasPtr = (AliasEntry *)Malloc( sizeof(AliasEntry)))) {
error = 1;
break;
}
(*aliasPtr)->name = displayOrAlias + 1;
nChars += len;
(*aliasPtr)->hosts = nHosts;
(*aliasPtr)->pHosts = hostPtr;
(*aliasPtr)->nhosts = 0;
(*aliasPtr)->hasBad = 0;
while ((hostOrAlias = ReadWord( &file, &len, TRUE ))) {
if (ParseHost( &nHosts, &hostPtr, &nChars, hostOrAlias, len,
PARSE_NO_BCAST ))
(*aliasPtr)->nhosts++;
else
(*aliasPtr)->hasBad = 1;
}
aliasPtr = &(*aliasPtr)->next;
nAliases++;
}
else if (!strcmp( displayOrAlias, LISTEN_STRING ))
{
if (!(*listenPtr = (ListenEntry *)Malloc( sizeof(ListenEntry)))) {
error = 1;
break;
}
(*listenPtr)->iface = nHosts;
if (!(hostOrAlias = ReadWord( &file, &len, TRUE )) ||
!strcmp( hostOrAlias, WILDCARD_STRING ) ||
!ParseHost( &nHosts, &hostPtr, &nChars, hostOrAlias, len,
PARSE_NO_BCAST|PARSE_NO_PAT|PARSE_NO_ALIAS ))
{
(*listenPtr)->iface = -1;
}
(*listenPtr)->mcasts = nHosts;
(*listenPtr)->nmcasts = 0;
while ((hostOrAlias = ReadWord( &file, &len, TRUE ))) {
if (ParseHost( &nHosts, &hostPtr, &nChars, hostOrAlias, len,
PARSE_NO_BCAST|PARSE_NO_PAT|PARSE_NO_ALIAS ))
(*listenPtr)->nmcasts++;
}
listenPtr = &(*listenPtr)->next;
nListens++;
}
else
{
if (!(*acPtr = (AclEntry *)Malloc( sizeof(AclEntry)))) {
error = 1;
break;
}
(*acPtr)->flags = 0;
if (*displayOrAlias == NEGATE_CHARACTER) {
(*acPtr)->flags |= a_notAllowed;
displayOrAlias++;
} else if (*displayOrAlias == EQUAL_CHARACTER)
displayOrAlias++;
(*acPtr)->entries = nHosts;
(*acPtr)->pEntries = hostPtr;
(*acPtr)->nentries = 1;
if (!ParseHost( &nHosts, &hostPtr, &nChars, displayOrAlias, len,
PARSE_NO_BCAST ))
{
bad = 1;
if ((*acPtr)->flags & a_notAllowed) {
LogError( "XDMCP ACL: unresolved host in denying rule\n" );
error = 1;
}
} else
bad = 0;
(*acPtr)->hosts = nHosts;
(*acPtr)->pHosts = hostPtr;
(*acPtr)->nhosts = 0;
while ((hostOrAlias = ReadWord( &file, &len, TRUE ))) {
if (!strcmp( hostOrAlias, CHOOSER_STRING ))
(*acPtr)->flags |= a_useChooser;
else if (!strcmp( hostOrAlias, NOBROADCAST_STRING ))
(*acPtr)->flags |= a_notBroadcast;
else {
if (ParseHost( &nHosts, &hostPtr, &nChars,
hostOrAlias, len, PARSE_NO_PAT ))
(*acPtr)->nhosts++;
}
}
if (!bad) {
acPtr = &(*acPtr)->next;
nAcls++;
}
}
}
if (!nListens) {
if (!(*listenPtr = (ListenEntry *)Malloc( sizeof(ListenEntry))))
error = 1;
else {
(*listenPtr)->iface = -1;
(*listenPtr)->mcasts = nHosts;
(*listenPtr)->nmcasts = 0;
#if defined(IPv6) && defined(AF_INET6) && defined(XDM_DEFAULT_MCAST_ADDR6)
if (ParseHost( &nHosts, &hostPtr, &nChars,
XDM_DEFAULT_MCAST_ADDR6,
sizeof(XDM_DEFAULT_MCAST_ADDR6)-1,
PARSE_ALL ))
(*listenPtr)->nmcasts++;
#endif
nListens++;
}
}
for (acl = acList, i = 0; i < nAcls; i++, acl = acl->next)
if (checkHostlist( acl->pEntries, acl->nentries, aliasList, nAliases,
0, (acl->flags & a_notAllowed) ? CHECK_NOT : 0 ) ||
checkHostlist( acl->pHosts, acl->nhosts, aliasList, nAliases,
0, CHECK_NO_PAT ))
error = 1;
if (error) {
nHosts = nAliases = nAcls = nListens = nChars = 0;
sendacl:
LogError( "No XDMCP requests will be granted\n" );
}
GSendInt( nHosts );
GSendInt( nListens );
GSendInt( nAliases );
GSendInt( nAcls );
GSendInt( nChars );
for (i = 0; i < nHosts; i++, hostList = hostList->next) {
GSendInt( hostList->type );
switch (hostList->type) {
case HOST_ALIAS:
GSendStr( hostList->entry.aliasPattern );
break;
case HOST_PATTERN:
GSendStr( hostList->entry.hostPattern );
break;
case HOST_ADDRESS:
GSendArr( hostList->entry.displayAddress.hostAddrLen,
hostList->entry.displayAddress.hostAddress );
GSendInt( hostList->entry.displayAddress.connectionType );
break;
}
}
for (i = 0; i < nListens; i++, listenList = listenList->next) {
GSendInt( listenList->iface );
GSendInt( listenList->mcasts );
GSendInt( listenList->nmcasts );
}
for (i = 0; i < nAliases; i++, aliasList = aliasList->next) {
GSendStr( aliasList->name );
GSendInt( aliasList->hosts );
GSendInt( aliasList->nhosts );
}
for (i = 0; i < nAcls; i++, acList = acList->next) {
GSendInt( acList->entries );
GSendInt( acList->nentries );
GSendInt( acList->hosts );
GSendInt( acList->nhosts );
GSendInt( acList->flags );
}
}
#endif
int main( int argc ATTR_UNUSED, char **argv )
{
DSpec dspec;
ValArr va;
char *ci, *disp, *dcls, *cfgfile;
int what;
if (!(ci = getenv( "CONINFO" ))) {
fprintf( stderr, "This program is part of kdm and should not be run manually.\n" );
return 1;
}
if (sscanf( ci, "%d %d", &rfd, &wfd ) != 2)
return 1;
InitLog();
if ((debugLevel = GRecvInt()) & DEBUG_WCONFIG)
sleep( 100 );
/* Debug ("parsing command line\n");*/
if (**++argv)
kdmrc = *argv;
/*
while (*++argv) {
}
*/
for (;;) {
/* Debug ("Awaiting command ...\n");*/
if (!GRecvCmd( &what ))
break;
switch (what) {
case GC_Files:
/* Debug ("GC_Files\n");*/
ReadConf();
CopyValues( 0, &secGeneral, 0, C_CONFIG );
#ifdef XDMCP
CopyValues( 0, &secXdmcp, 0, C_CONFIG );
GSendInt( 2 );
#else
GSendInt( 1 );
#endif
GSendStr( kdmrc );
GSendInt( -1 );
#ifdef XDMCP
GSendNStr( VXaccess.ptr, VXaccess.len - 1 );
GSendInt( 0 );
#endif
for (; (what = GRecvInt()) != -1; )
switch (what) {
case GC_gGlobal:
case GC_gDisplay:
GSendInt( 0 );
break;
#ifdef XDMCP
case GC_gXaccess:
GSendInt( 1 );
break;
#endif
default:
GSendInt( -1 );
break;
}
break;
case GC_GetConf:
/* Debug( "GC_GetConf\n" );*/
memset( &va, 0, sizeof(va) );
what = GRecvInt();
cfgfile = GRecvStr();
switch (what) {
case GC_gGlobal:
/* Debug( "GC_gGlobal\n" );*/
Debug( "getting global config\n" );
ReadConf();
CopyValues( &va, &secGeneral, 0, 0 );
#ifdef XDMCP
CopyValues( &va, &secXdmcp, 0, 0 );
#endif
CopyValues( &va, &secShutdown, 0, 0 );
SendValues( &va );
break;
case GC_gDisplay:
/* Debug( "GC_gDisplay\n" );*/
disp = GRecvStr();
/* Debug( " Display %s\n", disp );*/
dcls = GRecvStr();
/* Debug( " Class %s\n", dcls );*/
Debug( "getting config for display %s, class %s\n", disp, dcls );
MkDSpec( &dspec, disp, dcls ? dcls : "" );
ReadConf();
CopyValues( &va, &sec_Core, &dspec, 0 );
CopyValues( &va, &sec_Greeter, &dspec, 0 );
free( disp );
if (dcls)
free( dcls );
SendValues( &va );
break;
#ifdef XDMCP
case GC_gXaccess:
ReadAccessFile( cfgfile );
break;
#endif
default:
Debug( "Unsupported config category %#x\n", what );
}
free( cfgfile );
break;
default:
Debug( "Unknown config command %#x\n", what );
}
}
/* Debug( "Config reader exiting ..." );*/
return EX_NORMAL;
}
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