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/* lrexlib.c - PCRE regular expression library */
/* Reuben Thomas nov00-18dec04 */
/* Shmuel Zeigerman may04-18dec04 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
extern "C" {
#include "lua.h"
#include "lauxlib.h"
}
#include <locale.h>
#include "nbase.h"
#include "nmap_error.h"
#ifdef HAVE_PCRE_PCRE_H
# include <pcre/pcre.h>
#else
# include <pcre.h>
#endif
#include "nse_pcrelib.h"
static int get_startoffset(lua_State *L, int stackpos, size_t len)
{
int startoffset = luaL_optint(L, stackpos, 1);
if(startoffset > 0)
startoffset--;
else if(startoffset < 0) {
startoffset += (int) len;
if(startoffset < 0)
startoffset = 0;
}
return startoffset;
}
static int udata_tostring (lua_State *L, const char* type_handle,
const char* type_name)
{
char buf[256];
void *udata = luaL_checkudata(L, 1, type_handle);
if(udata) {
(void)Snprintf(buf, 255, "%s (%p)", type_name, udata);
lua_pushstring(L, buf);
}
else {
(void)Snprintf(buf, 255, "must be userdata of type '%s'", type_name);
(void)luaL_argerror(L, 1, buf);
}
free(udata);
return 1;
}
typedef struct { const char* key; lua_Number val; } flags_pair;
static int get_flags (lua_State *L, const flags_pair *arr)
{
const flags_pair *p;
lua_newtable(L);
for(p=arr; p->key != NULL; p++) {
lua_pushstring(L, p->key);
lua_pushnumber(L, p->val);
lua_rawset(L, -3);
}
return 1;
}
const char pcre_handle[] = "pcre_regex_handle";
const char pcre_typename[] = "pcre_regex";
typedef struct {
pcre *pr;
pcre_extra *extra;
int *match;
int ncapt;
const unsigned char *tables;
} pcre2; /* a better name is needed */
static const unsigned char *Lpcre_maketables(lua_State *L, int stackpos)
{
const unsigned char *tables;
char old_locale[256];
char *locale = strdup(luaL_checkstring(L, stackpos));
if(locale == NULL)
luaL_error(L, "cannot set locale");
strncpy(old_locale, setlocale(LC_CTYPE, NULL), 255); /* store the locale */
if(setlocale(LC_CTYPE, locale) == NULL) /* set new locale */
luaL_error(L, "cannot set locale");
tables = pcre_maketables(); /* make tables with new locale */
(void)setlocale(LC_CTYPE, old_locale); /* restore the old locale */
free(locale);
return tables;
}
static int Lpcre_comp(lua_State *L)
{
char buf[256];
const char *error;
int erroffset;
pcre2 *ud;
const char *pattern = luaL_checkstring(L, 1);
int cflags = luaL_optint(L, 2, 0);
const unsigned char *tables = NULL;
if(lua_gettop(L) > 2 && !lua_isnil(L, 3))
tables = Lpcre_maketables(L, 3);
if(tables == NULL)
luaL_error(L, "PCRE compilation failed");
ud = (pcre2*)lua_newuserdata(L, sizeof(pcre2));
luaL_getmetatable(L, pcre_handle);
(void)lua_setmetatable(L, -2);
ud->match = NULL;
ud->extra = NULL;
ud->tables = tables; /* keep this for eventual freeing */
ud->pr = pcre_compile(pattern, cflags, &error, &erroffset, tables);
if(!ud->pr) {
(void)Snprintf(buf, 255, "%s (pattern offset: %d)", error, erroffset+1);
/* show offset 1-based as it's common in Lua */
luaL_error(L, buf);
}
ud->extra = pcre_study(ud->pr, 0, &error);
if(error) luaL_error(L, error);
pcre_fullinfo(ud->pr, ud->extra, PCRE_INFO_CAPTURECOUNT, &ud->ncapt);
/* need (2 ints per capture, plus one for substring match) * 3/2 */
ud->match = (int *) safe_malloc((ud->ncapt + 1) * 3 * sizeof(int));
return 1;
}
static void Lpcre_getargs(lua_State *L, pcre2 **pud, const char **text,
size_t *text_len)
{
*pud = (pcre2 *)luaL_checkudata(L, 1, pcre_handle);
if(*pud == NULL)
(void)luaL_argerror(L, 1, ("compiled regexp expected"));
*text = luaL_checklstring(L, 2, text_len);
}
typedef void (*Lpcre_push_matches) (lua_State *L, const char *text, pcre2 *ud);
static void Lpcre_push_substrings (lua_State *L, const char *text, pcre2 *ud)
{
unsigned int i, j;
unsigned int namecount;
unsigned char *name_table;
int name_entry_size;
unsigned char *tabptr;
const int *match = ud->match;
lua_newtable(L);
for (i = 1; i <= (unsigned) ud->ncapt; i++) {
j = i * 2;
if (match[j] >= 0)
lua_pushlstring(L, text + match[j], (size_t)(match[j + 1] - match[j]));
else
lua_pushboolean(L, 0);
lua_rawseti(L, -2, i);
}
/* now do named subpatterns - NJG */
(void)pcre_fullinfo(ud->pr, ud->extra, PCRE_INFO_NAMECOUNT, &namecount);
if (namecount <= 0)
return;
(void)pcre_fullinfo(ud->pr, ud->extra, PCRE_INFO_NAMETABLE, &name_table);
(void)pcre_fullinfo(ud->pr, ud->extra, PCRE_INFO_NAMEENTRYSIZE, &name_entry_size);
tabptr = name_table;
for (i = 0; i < namecount; i++) {
unsigned int n = (tabptr[0] << 8) | tabptr[1]; /* number of the capturing parenthesis */
if (n > 0 && n <= (unsigned) ud->ncapt) { /* check range */
unsigned int j = n * 2;
lua_pushstring(L, (char*)tabptr + 2); /* name of the capture, zero terminated */
if (match[j] >= 0)
lua_pushlstring(L, text + match[j], match[j + 1] - match[j]);
else
lua_pushboolean(L, 0);
lua_rawset(L, -3);
}
tabptr += name_entry_size;
}
}
static void Lpcre_push_offsets (lua_State *L, const char *text, pcre2 * ud)
{
unsigned int i, j, k;
if(text) {
/* suppress compiler warning */
}
lua_newtable(L);
for (i=1, j=1; i <= (unsigned) ud->ncapt; i++) {
k = i * 2;
if (ud->match[k] >= 0) {
lua_pushnumber(L, ud->match[k] + 1);
lua_rawseti(L, -2, j++);
lua_pushnumber(L, ud->match[k+1]);
lua_rawseti(L, -2, j++);
}
else {
lua_pushboolean(L, 0);
lua_rawseti(L, -2, j++);
lua_pushboolean(L, 0);
lua_rawseti(L, -2, j++);
}
}
}
static int Lpcre_match_generic(lua_State *L, Lpcre_push_matches push_matches)
{
int res;
const char *text;
pcre2 *ud;
size_t elen;
int startoffset;
int eflags = luaL_optint(L, 4, 0);
Lpcre_getargs(L, &ud, &text, &elen);
startoffset = get_startoffset(L, 3, elen);
res = pcre_exec(ud->pr, ud->extra, text, (int)elen, startoffset, eflags,
ud->match, (ud->ncapt + 1) * 3);
if (res >= 0) {
lua_pushnumber(L, (lua_Number) ud->match[0] + 1);
lua_pushnumber(L, (lua_Number) ud->match[1]);
(*push_matches)(L, text, ud);
return 3;
}
return 0;
}
static int Lpcre_match(lua_State *L)
{
return Lpcre_match_generic(L, Lpcre_push_substrings);
}
static int Lpcre_exec(lua_State *L)
{
return Lpcre_match_generic(L, Lpcre_push_offsets);
}
static int Lpcre_gmatch(lua_State *L)
{
int res;
size_t len;
int nmatch = 0, limit = 0;
const char *text;
pcre2 *ud;
int maxmatch = luaL_optint(L, 4, 0);
int eflags = luaL_optint(L, 5, 0);
int startoffset = 0;
Lpcre_getargs(L, &ud, &text, &len);
luaL_checktype(L, 3, LUA_TFUNCTION);
if(maxmatch > 0) /* this must be stated in the docs */
limit = 1;
while (!limit || nmatch < maxmatch) {
res = pcre_exec(ud->pr, ud->extra, text, (int)len, startoffset, eflags,
ud->match, (ud->ncapt + 1) * 3);
if (res >= 0) {
nmatch++;
lua_pushvalue(L, 3);
lua_pushlstring(L, text + ud->match[0], ud->match[1] - ud->match[0]);
Lpcre_push_substrings(L, text, ud);
lua_call(L, 2, 1);
if(lua_toboolean(L, -1))
break;
lua_pop(L, 1);
startoffset = ud->match[1];
} else
break;
}
lua_pushnumber(L, nmatch);
return 1;
}
static int Lpcre_gc (lua_State *L)
{
pcre2 *ud = (pcre2 *)luaL_checkudata(L, 1, pcre_handle);
if (ud) {
if(ud->pr) pcre_free(ud->pr);
if(ud->extra) pcre_free(ud->extra);
if(ud->tables) pcre_free((void *)ud->tables);
if(ud->match) free(ud->match);
}
return 0;
}
static int Lpcre_tostring (lua_State *L) {
return udata_tostring(L, pcre_handle, pcre_typename);
}
static int Lpcre_vers (lua_State *L)
{
lua_pushstring(L, pcre_version());
return 1;
}
static flags_pair pcre_flags[] =
{
{ "CASELESS", PCRE_CASELESS },
{ "MULTILINE", PCRE_MULTILINE },
{ "DOTALL", PCRE_DOTALL },
{ "EXTENDED", PCRE_EXTENDED },
{ "ANCHORED", PCRE_ANCHORED },
{ "DOLLAR_ENDONLY", PCRE_DOLLAR_ENDONLY },
{ "EXTRA", PCRE_EXTRA },
{ "NOTBOL", PCRE_NOTBOL },
{ "NOTEOL", PCRE_NOTEOL },
{ "UNGREEDY", PCRE_UNGREEDY },
{ "NOTEMPTY", PCRE_NOTEMPTY },
{ "UTF8", PCRE_UTF8 },
#if PCRE_MAJOR >= 4
{ "NO_AUTO_CAPTURE", PCRE_NO_AUTO_CAPTURE },
{ "NO_UTF8_CHECK", PCRE_NO_UTF8_CHECK },
#endif
#ifdef PCRE_AUTO_CALLOUT
{ "AUTO_CALLOUT", PCRE_AUTO_CALLOUT },
#endif
#ifdef PCRE_PARTIAL
{ "PARTIAL", PCRE_PARTIAL },
#endif
#ifdef PCRE_DFA_SHORTEST
{ "DFA_SHORTEST", PCRE_DFA_SHORTEST },
#endif
#ifdef PCRE_DFA_RESTART
{ "DFA_RESTART", PCRE_DFA_RESTART },
#endif
#ifdef PCRE_FIRSTLINE
{ "FIRSTLINE", PCRE_FIRSTLINE },
#endif
#ifdef PCRE_DUPNAMES
{ "DUPNAMES", PCRE_DUPNAMES },
#endif
#ifdef PCRE_NEWLINE_CR
{ "NEWLINE_CR", PCRE_NEWLINE_CR },
#endif
#ifdef PCRE_NEWLINE_LF
{ "NEWLINE_LF", PCRE_NEWLINE_LF },
#endif
#ifdef PCRE_NEWLINE_CRLF
{ "NEWLINE_CRLF", PCRE_NEWLINE_CRLF },
#endif
#ifdef PCRE_NEWLINE_ANY
{ "NEWLINE_ANY", PCRE_NEWLINE_ANY },
#endif
#ifdef PCRE_NEWLINE_ANYCRLF
{ "NEWLINE_ANYCRLF", PCRE_NEWLINE_ANYCRLF },
#endif
#ifdef PCRE_BSR_ANYCRLF
{ "BSR_ANYCRLF", PCRE_BSR_ANYCRLF },
#endif
#ifdef PCRE_BSR_UNICODE
{ "BSR_UNICODE", PCRE_BSR_UNICODE },
#endif
{ NULL, 0 }
};
static int Lpcre_get_flags (lua_State *L) {
return get_flags(L, pcre_flags);
}
static const luaL_Reg pcremeta[] = {
{"exec", Lpcre_exec},
{"match", Lpcre_match},
{"gmatch", Lpcre_gmatch},
{"__gc", Lpcre_gc},
{"__tostring", Lpcre_tostring},
{NULL, NULL}
};
/* Open the library */
static const luaL_Reg pcrelib[] = {
{"new", Lpcre_comp},
{"flags", Lpcre_get_flags},
{"version", Lpcre_vers},
{NULL, NULL}
};
LUALIB_API int luaopen_pcrelib(lua_State *L)
{
luaL_newmetatable(L, pcre_handle);
lua_pushliteral(L, "__index");
luaL_newlib(L, pcremeta);
lua_rawset(L, -3);
lua_pop(L, 1);
luaL_newlib(L, pcrelib);
return 1;
}
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