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https://github.com/nmap/nmap.git
synced 2026-01-09 07:59:03 +00:00
added nse_binlib.cc: bin.pack() and bin.unpack()
This commit is contained in:
pgpickering
407
nse_binlib.cc
Normal file
407
nse_binlib.cc
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@@ -0,0 +1,407 @@
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/*
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* -- nse_packlib.cc
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* -- adapted from:
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* lpack.c
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* a Lua library for packing and unpacking binary data
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* Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
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* 29 Jun 2007 19:27:20
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* This code is hereby placed in the public domain.
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* with contributions from Ignacio Castaño <castanyo@yahoo.es> and
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* Roberto Ierusalimschy <roberto@inf.puc-rio.br>.
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* -- modified:
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* BinStringHandling
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*/
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#define OP_ZSTRING 'z' /* zero-terminated string */
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#define OP_BSTRING 'p' /* string preceded by length byte */
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#define OP_WSTRING 'P' /* string preceded by length word */
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#define OP_SSTRING 'a' /* string preceded by length size_t */
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#define OP_STRING 'A' /* string */
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#define OP_FLOAT 'f' /* float */
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#define OP_DOUBLE 'd' /* double */
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#define OP_NUMBER 'n' /* Lua number */
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#define OP_CHAR 'c' /* char */
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#define OP_BYTE 'C' /* byte = unsigned char */
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#define OP_SHORT 's' /* short */
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#define OP_USHORT 'S' /* unsigned short */
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#define OP_INT 'i' /* int */
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#define OP_UINT 'I' /* unsigned int */
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#define OP_LONG 'l' /* long */
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#define OP_ULONG 'L' /* unsigned long */
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#define OP_LITTLEENDIAN '<' /* little endian */
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#define OP_BIGENDIAN '>' /* big endian */
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#define OP_NATIVE '=' /* native endian */
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#define OP_BINMSB 'B'
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#define OP_HEX 'H'
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#define OP_NULL 'x'
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#include <ctype.h>
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#include <string.h>
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extern "C" {
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#include "lua.h"
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#include "lualib.h"
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#include "lauxlib.h"
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}
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#include "nse_binlib.h"
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static void badcode(lua_State *L, int c)
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{
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char s[]="bad code `?'";
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s[sizeof(s)-3]=c;
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luaL_argerror(L,1,s);
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}
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static int doendian(int c)
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{
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int x=1;
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int e=*(char*)&x;
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if (c==OP_LITTLEENDIAN) return !e;
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if (c==OP_BIGENDIAN) return e;
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if (c==OP_NATIVE) return 0;
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return 0;
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}
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static void doswap(int swap, void *p, size_t n)
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{
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if (swap)
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{
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char *a=(char*)p;
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int i,j;
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for (i=0, j=n-1, n=n/2; n--; i++, j--)
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{
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char t=a[i]; a[i]=a[j]; a[j]=t;
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}
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}
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}
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#define UNPACKNUMBER(OP,T) \
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case OP: \
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{ \
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T a; \
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int m=sizeof(a); \
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if (i+m>len) { done = 1; break;} \
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memcpy(&a,s+i,m); \
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i+=m; \
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doswap(swap,&a,m); \
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lua_pushnumber(L,(lua_Number)a); \
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++n; \
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break; \
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}
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#define UNPACKSTRING(OP,T) \
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case OP: \
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{ \
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T l; \
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int m=sizeof(l); \
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if (i+m>len) { done = 1; break; } \
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memcpy(&l,s+i,m); \
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doswap(swap,&l,m); \
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if (i+m+l>len) { done = 1; break;} \
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i+=m; \
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lua_pushlstring(L,s+i,l); \
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i+=l; \
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++n; \
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break; \
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}
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#define HEXDIGITS(DIG) \
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"0123456789ABCDEF"[DIG]
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static int l_unpack(lua_State *L) /** unpack(f,s, [init]) */
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{
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size_t len;
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const char *s=luaL_checklstring(L,2,&len); /* switched s and f */
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const char *f=luaL_checkstring(L,1);
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int i=luaL_optnumber(L,3,1)-1;
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int n=0;
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int swap=0;
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int done=0;
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lua_pushnil(L);
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while (*f && done == 0)
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{
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int c=*f++;
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int N=1;
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if (isdigit(*f))
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{
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N=0;
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while (isdigit(*f)) N=10*N+(*f++)-'0';
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if (N==0 && c==OP_STRING) { lua_pushliteral(L,""); ++n; }
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}
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while (N-- && done == 0) switch (c)
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{
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case OP_LITTLEENDIAN:
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case OP_BIGENDIAN:
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case OP_NATIVE:
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{
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swap=doendian(c);
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N=0;
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break;
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}
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case OP_STRING:
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{
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++N;
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if (i+N>len) {done = 1; break; }
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lua_pushlstring(L,s+i,N);
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i+=N;
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++n;
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N=0;
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break;
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}
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case OP_ZSTRING:
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{
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size_t l;
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if (i>=len) {done = 1; break; }
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l=strlen(s+i);
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lua_pushlstring(L,s+i,l);
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i+=l+1;
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++n;
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break;
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}
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UNPACKSTRING(OP_BSTRING, unsigned char)
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UNPACKSTRING(OP_WSTRING, unsigned short)
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UNPACKSTRING(OP_SSTRING, size_t)
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UNPACKNUMBER(OP_NUMBER, lua_Number)
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UNPACKNUMBER(OP_DOUBLE, double)
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UNPACKNUMBER(OP_FLOAT, float)
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UNPACKNUMBER(OP_CHAR, char)
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UNPACKNUMBER(OP_BYTE, unsigned char)
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UNPACKNUMBER(OP_SHORT, short)
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UNPACKNUMBER(OP_USHORT, unsigned short)
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UNPACKNUMBER(OP_INT, int)
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UNPACKNUMBER(OP_UINT, unsigned int)
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UNPACKNUMBER(OP_LONG, long)
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UNPACKNUMBER(OP_ULONG, unsigned long)
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case OP_BINMSB:
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{
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luaL_Buffer buf;
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luaL_buffinit(L,&buf);
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unsigned char sbyte = 0x80;
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N++;
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if (i+N > len) {done = 1; break;}
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for (int ii = i; ii < i+N; ii++) {
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sbyte = 0x80;
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for (int ij = 0; ij < 8; ij++) {
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if (s[ii] & sbyte) {
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luaL_addlstring(&buf, "1", 1);
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} else {
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luaL_addlstring(&buf, "0", 1);
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}
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sbyte = sbyte >> 1;
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}
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}
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luaL_pushresult(&buf);
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n++;
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i += N;
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N = 0;
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break;
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}
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case OP_HEX:
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{
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luaL_Buffer buf;
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char hdigit = '0';
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int val = 0;
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luaL_buffinit(L,&buf);
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N++;
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if (i+N > len) {done = 1; break;}
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for (int ii = i; ii < i+N; ii++) {
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val = s[ii] & 0xF0;
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val = val >> 4;
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hdigit = HEXDIGITS(val);
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luaL_addlstring(&buf, &hdigit, 1);
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val = s[ii] & 0x0F;
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hdigit = HEXDIGITS(val);
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luaL_addlstring(&buf, &hdigit, 1);
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}
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luaL_pushresult(&buf);
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n++;
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i += N;
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N = 0;
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break;
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}
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case OP_NULL:
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{
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i+= N + 1;
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N = 0;
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break;
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}
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case ' ': case ',':
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break;
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default:
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badcode(L,c);
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break;
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}
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}
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lua_pushnumber(L,i+1);
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lua_replace(L,-n-2);
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return n+1;
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}
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#define PACKNUMBER(OP,T) \
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case OP: \
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{ \
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T a=(T)luaL_checknumber(L,i++); \
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doswap(swap,&a,sizeof(a)); \
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luaL_addlstring(&b,(char*)&a,sizeof(a)); \
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break; \
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}
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#define PACKSTRING(OP,T) \
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case OP: \
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{ \
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size_t l; \
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const char *a=luaL_checklstring(L,i++,&l); \
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T ll=(T)l; \
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doswap(swap,&ll,sizeof(ll)); \
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luaL_addlstring(&b,(char*)&ll,sizeof(ll)); \
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luaL_addlstring(&b,a,l); \
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break; \
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}
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static int l_pack(lua_State *L) /** pack(f,...) */
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{
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int i=2;
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const char *f=luaL_checkstring(L,1);
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int swap=0;
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luaL_Buffer b;
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luaL_buffinit(L,&b);
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while (*f)
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{
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int c=*f++;
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int N=1;
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if (isdigit(*f))
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{
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N=0;
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while (isdigit(*f)) N=10*N+(*f++)-'0';
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}
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while (N--) switch (c)
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{
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case OP_LITTLEENDIAN:
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case OP_BIGENDIAN:
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case OP_NATIVE:
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{
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swap=doendian(c);
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N=0;
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break;
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}
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case OP_STRING:
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case OP_ZSTRING:
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{
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size_t l;
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const char *a=luaL_checklstring(L,i++,&l);
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luaL_addlstring(&b,a,l+(c==OP_ZSTRING));
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break;
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}
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PACKSTRING(OP_BSTRING, unsigned char)
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PACKSTRING(OP_WSTRING, unsigned short)
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PACKSTRING(OP_SSTRING, size_t)
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PACKNUMBER(OP_NUMBER, lua_Number)
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PACKNUMBER(OP_DOUBLE, double)
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PACKNUMBER(OP_FLOAT, float)
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PACKNUMBER(OP_CHAR, char)
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PACKNUMBER(OP_BYTE, unsigned char)
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PACKNUMBER(OP_SHORT, short)
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PACKNUMBER(OP_USHORT, unsigned short)
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PACKNUMBER(OP_INT, int)
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PACKNUMBER(OP_UINT, unsigned int)
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PACKNUMBER(OP_LONG, long)
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PACKNUMBER(OP_ULONG, unsigned long)
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case OP_BINMSB:
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{
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unsigned char sbyte = 0;
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size_t l;
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int ii = 0, ia = 0;
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const char *a = luaL_checklstring(L, i++, &l);
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for (ia = 0; ia < l; ia+= 8) {
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sbyte = 0;
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for (ii = 0; ii+ia < l && ii < 8; ii++) {
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sbyte = sbyte << 1;
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if (a[ii+ia] != '0') {
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sbyte++;
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}
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}
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for (; ii < 8; ii++) {
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sbyte = sbyte << 1;
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}
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luaL_addlstring(&b, (char *) &sbyte, 1);
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}
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break;
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}
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case OP_NULL:
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{
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char nullbyte = 0;
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luaL_addlstring(&b, &nullbyte, 1);
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break;
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}
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case OP_HEX:
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{ // doing digit parsing the lpack way
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unsigned char sbyte = 0;
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size_t l;
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int ii = 0;
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int odd = 0;
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const char *a = luaL_checklstring(L, i++, &l);
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for (ii = 0; ii < l; ii++) {
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if (isxdigit(a[ii])) {
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if (isdigit(a[ii])) {
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sbyte += a[ii] - '0';
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odd++;
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} else if (a[ii] >= 'A' && a[ii] <= 'F') {
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sbyte += a[ii] - 'A' + 10;
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odd++;
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} else if (a[ii] >= 'a' && a[ii] <= 'f') {
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sbyte += a[ii] - 'a' + 10;
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odd++;
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}
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if (odd == 1) {
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sbyte = sbyte << 4;
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} else if (odd == 2) {
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luaL_addlstring(&b, (char *) &sbyte, 1);
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sbyte = 0;
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odd = 0;
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}
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} else if (isspace(a[ii])) {
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/* ignore */
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} else {
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/* err ... ignore too*/
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}
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}
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if (odd == 1) {
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luaL_addlstring(&b, (char *) &sbyte, 1);
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}
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break;
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}
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case ' ': case ',':
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break;
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default:
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badcode(L,c);
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break;
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}
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}
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luaL_pushresult(&b);
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return 1;
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}
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static const luaL_reg binlib[] =
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{
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{"pack", l_pack},
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{"unpack", l_unpack},
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{NULL, NULL}
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};
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/*
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** Open bin library
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*/
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LUALIB_API int luaopen_binlib (lua_State *L) {
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luaL_register(L, NSE_BINLIBNAME, binlib);
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return 1;
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}
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Reference in New Issue
Block a user