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ngx_http_lua_string.c
480 lines (353 loc) · 10.7 KB
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ngx_http_lua_string.c
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#ifndef DDEBUG
#define DDEBUG 0
#endif
#include "ddebug.h"
#include "ngx_http_lua_string.h"
#include "ngx_http_lua_util.h"
#include "ngx_crc32.h"
static uintptr_t ngx_http_lua_ngx_escape_sql_str(u_char *dst, u_char *src,
size_t size);
static int ngx_http_lua_ngx_escape_uri(lua_State *L);
static int ngx_http_lua_ngx_unescape_uri(lua_State *L);
static int ngx_http_lua_ngx_quote_sql_str(lua_State *L);
static int ngx_http_lua_ngx_md5(lua_State *L);
static int ngx_http_lua_ngx_md5_bin(lua_State *L);
static int ngx_http_lua_ngx_decode_base64(lua_State *L);
static int ngx_http_lua_ngx_encode_base64(lua_State *L);
static int ngx_http_lua_ngx_crc32_short(lua_State *L);
static int ngx_http_lua_ngx_crc32_long(lua_State *L);
void
ngx_http_lua_inject_string_api(lua_State *L)
{
lua_pushcfunction(L, ngx_http_lua_ngx_escape_uri);
lua_setfield(L, -2, "escape_uri");
lua_pushcfunction(L, ngx_http_lua_ngx_unescape_uri);
lua_setfield(L, -2, "unescape_uri");
lua_pushcfunction(L, ngx_http_lua_ngx_quote_sql_str);
lua_setfield(L, -2, "quote_sql_str");
lua_pushcfunction(L, ngx_http_lua_ngx_decode_base64);
lua_setfield(L, -2, "decode_base64");
lua_pushcfunction(L, ngx_http_lua_ngx_encode_base64);
lua_setfield(L, -2, "encode_base64");
lua_pushcfunction(L, ngx_http_lua_ngx_md5_bin);
lua_setfield(L, -2, "md5_bin");
lua_pushcfunction(L, ngx_http_lua_ngx_md5);
lua_setfield(L, -2, "md5");
lua_pushcfunction(L, ngx_http_lua_ngx_crc32_short);
lua_setfield(L, -2, "crc32_short");
lua_pushcfunction(L, ngx_http_lua_ngx_crc32_long);
lua_setfield(L, -2, "crc32_long");
}
static int
ngx_http_lua_ngx_escape_uri(lua_State *L)
{
ngx_http_request_t *r;
size_t len, dlen;
uintptr_t escape;
u_char *src, *dst;
lua_getglobal(L, GLOBALS_SYMBOL_REQUEST);
r = lua_touserdata(L, -1);
lua_pop(L, 1);
if (r == NULL) {
return luaL_error(L, "no request object found");
}
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
src = (u_char *) luaL_checklstring(L, 1, &len);
if (len == 0) {
lua_pushlstring(L, NULL, 0);
return 1;
}
escape = 2 * ngx_http_lua_escape_uri(NULL, src, len, NGX_ESCAPE_URI);
dlen = escape + len;
dst = ngx_palloc(r->pool, dlen);
if (dst == NULL) {
return luaL_error(L, "memory allocation error");
}
if (escape == 0) {
ngx_memcpy(dst, src, len);
} else {
ngx_http_lua_escape_uri(dst, src, len, NGX_ESCAPE_URI);
}
lua_pushlstring(L, (char *) dst, dlen);
return 1;
}
static int
ngx_http_lua_ngx_unescape_uri(lua_State *L)
{
ngx_http_request_t *r;
size_t len, dlen;
u_char *p;
u_char *src, *dst;
lua_getglobal(L, GLOBALS_SYMBOL_REQUEST);
r = lua_touserdata(L, -1);
lua_pop(L, 1);
if (r == NULL) {
return luaL_error(L, "no request object found");
}
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
src = (u_char *) luaL_checklstring(L, 1, &len);
/* the unescaped string can only be smaller */
dlen = len;
p = ngx_palloc(r->pool, dlen);
if (p == NULL) {
return luaL_error(L, "memory allocation error");
}
dst = p;
ngx_http_lua_unescape_uri(&dst, &src, len, NGX_UNESCAPE_URI_COMPONENT);
lua_pushlstring(L, (char *) p, dst - p);
return 1;
}
static int
ngx_http_lua_ngx_quote_sql_str(lua_State *L)
{
ngx_http_request_t *r;
size_t len, dlen, escape;
u_char *p;
u_char *src, *dst;
lua_getglobal(L, GLOBALS_SYMBOL_REQUEST);
r = lua_touserdata(L, -1);
lua_pop(L, 1);
if (r == NULL) {
return luaL_error(L, "no request object found");
}
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
src = (u_char *) luaL_checklstring(L, 1, &len);
if (len == 0) {
dst = (u_char *) "''";
dlen = sizeof("''") - 1;
lua_pushlstring(L, (char *) dst, dlen);
return 1;
}
escape = ngx_http_lua_ngx_escape_sql_str(NULL, src, len);
dlen = sizeof("''") - 1 + len + escape;
p = ngx_palloc(r->pool, dlen);
if (p == NULL) {
return luaL_error(L, "out of memory");
}
dst = p;
*p++ = '\'';
if (escape == 0) {
p = ngx_copy(p, src, len);
} else {
p = (u_char *) ngx_http_lua_ngx_escape_sql_str(p, src, len);
}
*p++ = '\'';
if (p != dst + dlen) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"ngx.quote_sql_str: buffer error");
return NGX_ERROR;
}
lua_pushlstring(L, (char *) dst, p - dst);
return 1;
}
static uintptr_t
ngx_http_lua_ngx_escape_sql_str(u_char *dst, u_char *src,
size_t size)
{
ngx_uint_t n;
if (dst == NULL) {
/* find the number of chars to be escaped */
n = 0;
while (size) {
/* the highest bit of all the UTF-8 chars
* is always 1 */
if ((*src & 0x80) == 0) {
switch (*src) {
case '\r':
case '\n':
case '\\':
case '\'':
case '"':
case '\032':
n++;
break;
default:
break;
}
}
src++;
size--;
}
return (uintptr_t) n;
}
while (size) {
if ((*src & 0x80) == 0) {
switch (*src) {
case '\r':
*dst++ = '\\';
*dst++ = 'r';
break;
case '\n':
*dst++ = '\\';
*dst++ = 'n';
break;
case '\\':
*dst++ = '\\';
*dst++ = '\\';
break;
case '\'':
*dst++ = '\\';
*dst++ = '\'';
break;
case '"':
*dst++ = '\\';
*dst++ = '"';
break;
case '\032':
*dst++ = '\\';
*dst++ = *src;
break;
default:
*dst++ = *src;
break;
}
} else {
*dst++ = *src;
}
src++;
size--;
} /* while (size) */
return (uintptr_t) dst;
}
static int
ngx_http_lua_ngx_md5(lua_State *L)
{
u_char *src;
size_t slen;
ngx_md5_t md5;
u_char md5_buf[MD5_DIGEST_LENGTH];
u_char hex_buf[2 * sizeof(md5_buf)];
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
if (strcmp(luaL_typename(L, 1), (char *) "nil") == 0) {
src = (u_char *) "";
slen = 0;
} else {
src = (u_char *) luaL_checklstring(L, 1, &slen);
}
ngx_md5_init(&md5);
ngx_md5_update(&md5, src, slen);
ngx_md5_final(md5_buf, &md5);
ngx_hex_dump(hex_buf, md5_buf, sizeof(md5_buf));
lua_pushlstring(L, (char *) hex_buf, sizeof(hex_buf));
return 1;
}
static int
ngx_http_lua_ngx_md5_bin(lua_State *L)
{
u_char *src;
size_t slen;
ngx_md5_t md5;
u_char md5_buf[MD5_DIGEST_LENGTH];
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
if (strcmp(luaL_typename(L, 1), (char *) "nil") == 0) {
src = (u_char *) "";
slen = 0;
} else {
src = (u_char *) luaL_checklstring(L, 1, &slen);
}
dd("slen: %d", (int) slen);
ngx_md5_init(&md5);
ngx_md5_update(&md5, src, slen);
ngx_md5_final(md5_buf, &md5);
lua_pushlstring(L, (char *) md5_buf, sizeof(md5_buf));
return 1;
}
static int
ngx_http_lua_ngx_decode_base64(lua_State *L)
{
ngx_http_request_t *r;
ngx_str_t p, src;
lua_getglobal(L, GLOBALS_SYMBOL_REQUEST);
r = lua_touserdata(L, -1);
lua_pop(L, 1);
if (r == NULL) {
return luaL_error(L, "no request object found");
}
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
if (strcmp(luaL_typename(L, 1), (char *) "nil") == 0) {
src.data = (u_char *) "";
src.len = 0;
} else {
src.data = (u_char *) luaL_checklstring(L, 1, &src.len);
}
p.len = ngx_base64_decoded_length(src.len);
p.data = ngx_palloc(r->pool, p.len);
if (p.data == NULL) {
return NGX_ERROR;
}
if (ngx_decode_base64(&p, &src) == NGX_OK) {
lua_pushlstring(L, (char *) p.data, p.len);
} else {
lua_pushnil(L);
}
ngx_pfree(r->pool, p.data);
return 1;
}
static int
ngx_http_lua_ngx_encode_base64(lua_State *L)
{
ngx_http_request_t *r;
ngx_str_t p, src;
lua_getglobal(L, GLOBALS_SYMBOL_REQUEST);
r = lua_touserdata(L, -1);
lua_pop(L, 1);
if (r == NULL) {
return luaL_error(L, "no request object found");
}
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument");
}
if (strcmp(luaL_typename(L, 1), (char *) "nil") == 0) {
src.data = (u_char *) "";
src.len = 0;
} else {
src.data = (u_char *) luaL_checklstring(L, 1, &src.len);
}
p.len = ngx_base64_encoded_length(src.len);
p.data = ngx_palloc(r->pool, p.len);
if (p.data == NULL) {
return NGX_ERROR;
}
ngx_encode_base64(&p, &src);
lua_pushlstring(L, (char *) p.data, p.len);
ngx_pfree(r->pool, p.data);
return 1;
}
static int
ngx_http_lua_ngx_crc32_short(lua_State *L)
{
u_char *p;
size_t len;
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument, but got %d",
lua_gettop(L));
}
p = (u_char *) luaL_checklstring(L, 1, &len);
lua_pushnumber(L, (lua_Number) ngx_crc32_short(p, len));
return 1;
}
static int
ngx_http_lua_ngx_crc32_long(lua_State *L)
{
u_char *p;
size_t len;
if (lua_gettop(L) != 1) {
return luaL_error(L, "expecting one argument, but got %d",
lua_gettop(L));
}
p = (u_char *) luaL_checklstring(L, 1, &len);
lua_pushnumber(L, (lua_Number) ngx_crc32_long(p, len));
return 1;
}