lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "http_chunk.h"
#include "plugin.h"
#include "mod_magnet_cache.h"
#include "response.h"
#include "stat_cache.h"
#include "status_counter.h"
#include "etag.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <setjmp.h>
#ifdef HAVE_LUA_H
#include <lua.h>
#include <lauxlib.h>
#define LUA_RIDX_LIGHTTPD_SERVER "lighty.srv"
#define LUA_RIDX_LIGHTTPD_CONNECTION "lighty.con"
#define MAGNET_CONFIG_RAW_URL "magnet.attract-raw-url-to"
#define MAGNET_CONFIG_PHYSICAL_PATH "magnet.attract-physical-path-to"
#define MAGNET_RESTART_REQUEST 99
/* plugin config for all request/connections */
static jmp_buf exceptionjmp;
typedef struct {
array *url_raw;
array *physical_path;
} plugin_config;
typedef struct {
PLUGIN_DATA;
script_cache *cache;
buffer *encode_buf;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_magnet_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->cache = script_cache_init();
p->encode_buf = buffer_init();
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_magnet_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
array_free(s->url_raw);
array_free(s->physical_path);
free(s);
}
free(p->config_storage);
}
script_cache_free(p->cache);
buffer_free(p->encode_buf);
free(p);
return HANDLER_GO_ON;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_magnet_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ MAGNET_CONFIG_RAW_URL, NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ MAGNET_CONFIG_PHYSICAL_PATH, NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->url_raw = array_init();
s->physical_path = array_init();
cv[0].destination = s->url_raw;
cv[1].destination = s->physical_path;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_magnet_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(url_raw);
PATCH(physical_path);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN(MAGNET_CONFIG_RAW_URL))) {
PATCH(url_raw);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN(MAGNET_CONFIG_PHYSICAL_PATH))) {
PATCH(physical_path);
}
}
}
return 0;
}
#undef PATCH
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502
/* lua5.1 backward compat definition */
static void lua_pushglobaltable(lua_State *L) { /* (-0, +1, -) */
lua_pushvalue(L, LUA_GLOBALSINDEX);
}
#endif
static void magnet_setfenv_mainfn(lua_State *L, int funcIndex) { /* (-1, 0, -) */
#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM >= 502
/* set "_ENV" upvalue, which should be the first upvalue of a "main" lua
* function if it uses any global names
*/
const char* first_upvalue_name = lua_getupvalue(L, funcIndex, 1);
if (NULL == first_upvalue_name) return; /* doesn't have any upvalues */
lua_pop(L, 1); /* only need the name of the upvalue, not the value */
if (0 != strcmp(first_upvalue_name, "_ENV")) return;
if (NULL == lua_setupvalue(L, funcIndex, 1)) {
/* pop value if lua_setupvalue didn't set the (not existing) upvalue */
lua_pop(L, 1);
}
#else
lua_setfenv(L, funcIndex);
#endif
}
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502
/* lua 5.2 already supports __pairs */
/* See http://lua-users.org/wiki/GeneralizedPairsAndIpairs for implementation details.
* Override the default pairs() function to allow us to use a __pairs metakey
*/
static int magnet_pairs(lua_State *L) {
luaL_checkany(L, 1); /* "self" */
if (luaL_getmetafield(L, 1, "__pairs")) {
/* call __pairs(self) */
lua_pushvalue(L, 1);
lua_call(L, 1, 3);
} else {
/* call <original-pairs-method>(self) */
lua_pushvalue(L, lua_upvalueindex(1));
lua_pushvalue(L, 1);
lua_call(L, 1, 3);
}
return 3;
}
#endif
/* Define a function that will iterate over an array* (in upval 1) using current position (upval 2) */
static int magnet_array_next(lua_State *L) {
data_unset *du;
data_string *ds;
data_integer *di;
size_t pos = lua_tointeger(L, lua_upvalueindex(1));
array *a = lua_touserdata(L, lua_upvalueindex(2));
lua_settop(L, 0);
if (pos >= a->used) return 0;
if (NULL != (du = a->data[pos])) {
lua_pushlstring(L, CONST_BUF_LEN(du->key));
switch (du->type) {
case TYPE_STRING:
ds = (data_string *)du;
if (!buffer_is_empty(ds->value)) {
lua_pushlstring(L, CONST_BUF_LEN(ds->value));
} else {
lua_pushnil(L);
}
break;
case TYPE_INTEGER:
di = (data_integer *)du;
lua_pushinteger(L, di->value);
break;
default:
lua_pushnil(L);
break;
}
/* Update our positional upval to reflect our new current position */
pos++;
lua_pushinteger(L, pos);
lua_replace(L, lua_upvalueindex(1));
/* Returning 2 items on the stack (key, value) */
return 2;
}
return 0;
}
/* Create the closure necessary to iterate over the array *a with the above function */
static int magnet_array_pairs(lua_State *L, array *a) {
lua_pushinteger(L, 0); /* Push our current pos (the start) into upval 1 */
lua_pushlightuserdata(L, a); /* Push our array *a into upval 2 */
lua_pushcclosure(L, magnet_array_next, 2); /* Push our new closure with 2 upvals */
return 1;
}
static server* magnet_get_server(lua_State *L) {
server *srv;
lua_getfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_SERVER);
srv = lua_touserdata(L, -1);
lua_pop(L, 1);
return srv;
}
static connection* magnet_get_connection(lua_State *L) {
connection *con;
lua_getfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_CONNECTION);
con = lua_touserdata(L, -1);
lua_pop(L, 1);
return con;
}
typedef struct {
const char *ptr;
size_t len;
} const_buffer;
static const_buffer magnet_checkconstbuffer(lua_State *L, int index) {
const_buffer cb;
cb.ptr = luaL_checklstring(L, index, &cb.len);
return cb;
}
static buffer* magnet_checkbuffer(lua_State *L, int index) {
const_buffer cb = magnet_checkconstbuffer(L, index);
buffer *b = buffer_init();
buffer_copy_string_len(b, cb.ptr, cb.len);
return b;
}
static int magnet_print(lua_State *L) {
buffer *b = magnet_checkbuffer(L, 1);
log_error_write(magnet_get_server(L), __FILE__, __LINE__, "sB",
"(lua-print)",
b);
buffer_free(b);
return 0;
}
static int magnet_stat(lua_State *L) {
buffer *sb = magnet_checkbuffer(L, 1);
server *srv = magnet_get_server(L);
connection *con = magnet_get_connection(L);
stat_cache_entry *sce = NULL;
handler_t res;
res = stat_cache_get_entry(srv, con, sb, &sce);
buffer_free(sb);
if (HANDLER_GO_ON != res) {
lua_pushnil(L);
return 1;
}
lua_newtable(L); // return value
lua_pushboolean(L, S_ISREG(sce->st.st_mode));
lua_setfield(L, -2, "is_file");
lua_pushboolean(L, S_ISDIR(sce->st.st_mode));
lua_setfield(L, -2, "is_dir");
lua_pushboolean(L, S_ISCHR(sce->st.st_mode));
lua_setfield(L, -2, "is_char");
lua_pushboolean(L, S_ISBLK(sce->st.st_mode));
lua_setfield(L, -2, "is_block");
lua_pushboolean(L, S_ISSOCK(sce->st.st_mode));
lua_setfield(L, -2, "is_socket");
lua_pushboolean(L, S_ISLNK(sce->st.st_mode));
lua_setfield(L, -2, "is_link");
lua_pushboolean(L, S_ISFIFO(sce->st.st_mode));
lua_setfield(L, -2, "is_fifo");
lua_pushinteger(L, sce->st.st_mtime);
lua_setfield(L, -2, "st_mtime");
lua_pushinteger(L, sce->st.st_ctime);
lua_setfield(L, -2, "st_ctime");
lua_pushinteger(L, sce->st.st_atime);
lua_setfield(L, -2, "st_atime");
lua_pushinteger(L, sce->st.st_uid);
lua_setfield(L, -2, "st_uid");
lua_pushinteger(L, sce->st.st_gid);
lua_setfield(L, -2, "st_gid");
lua_pushinteger(L, sce->st.st_size);
lua_setfield(L, -2, "st_size");
lua_pushinteger(L, sce->st.st_ino);
lua_setfield(L, -2, "st_ino");
if (!buffer_string_is_empty(sce->etag)) {
/* we have to mutate the etag */
buffer *b = buffer_init();
etag_mutate(b, sce->etag);
lua_pushlstring(L, CONST_BUF_LEN(b));
buffer_free(b);
} else {
lua_pushnil(L);
}
lua_setfield(L, -2, "etag");
if (!buffer_string_is_empty(sce->content_type)) {
lua_pushlstring(L, CONST_BUF_LEN(sce->content_type));
} else {
lua_pushnil(L);
}
lua_setfield(L, -2, "content-type");
return 1;
}
static int magnet_atpanic(lua_State *L) {
buffer *b = magnet_checkbuffer(L, 1);
log_error_write(magnet_get_server(L), __FILE__, __LINE__, "sB",
"(lua-atpanic)",
b);
buffer_free(b);
longjmp(exceptionjmp, 1);
}
static int magnet_reqhdr_get(lua_State *L) {
connection *con = magnet_get_connection(L);
data_string *ds;
/* __index: param 1 is the (empty) table the value was not found in */
const char *key = luaL_checkstring(L, 2);
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, key))) {
if (!buffer_is_empty(ds->value)) {
lua_pushlstring(L, CONST_BUF_LEN(ds->value));
} else {
lua_pushnil(L);
}
} else {
lua_pushnil(L);
}
return 1;
}
static int magnet_reqhdr_pairs(lua_State *L) {
connection *con = magnet_get_connection(L);
return magnet_array_pairs(L, con->request.headers);
}
static int magnet_status_get(lua_State *L) {
data_integer *di;
server *srv = magnet_get_server(L);
/* __index: param 1 is the (empty) table the value was not found in */
const_buffer key = magnet_checkconstbuffer(L, 2);
di = status_counter_get_counter(srv, key.ptr, key.len);
lua_pushinteger(L, (lua_Integer)di->value);
return 1;
}
static int magnet_status_set(lua_State *L) {
server *srv = magnet_get_server(L);
/* __newindex: param 1 is the (empty) table the value is supposed to be set in */
const_buffer key = magnet_checkconstbuffer(L, 2);
int counter = (int) luaL_checkinteger(L, 3);
status_counter_set(srv, key.ptr, key.len, counter);
return 0;
}
static int magnet_status_pairs(lua_State *L) {
server *srv = magnet_get_server(L);
return magnet_array_pairs(L, srv->status);
}
typedef struct {
const char *name;
enum {
MAGNET_ENV_UNSET,
MAGNET_ENV_PHYICAL_PATH,
MAGNET_ENV_PHYICAL_REL_PATH,
MAGNET_ENV_PHYICAL_DOC_ROOT,
MAGNET_ENV_PHYICAL_BASEDIR,
MAGNET_ENV_URI_PATH,
MAGNET_ENV_URI_PATH_RAW,
MAGNET_ENV_URI_SCHEME,
MAGNET_ENV_URI_AUTHORITY,
MAGNET_ENV_URI_QUERY,
MAGNET_ENV_REQUEST_METHOD,
MAGNET_ENV_REQUEST_URI,
MAGNET_ENV_REQUEST_ORIG_URI,
MAGNET_ENV_REQUEST_PATH_INFO,
MAGNET_ENV_REQUEST_REMOTE_IP,
MAGNET_ENV_REQUEST_PROTOCOL
} type;
} magnet_env_t;
static const magnet_env_t magnet_env[] = {
{ "physical.path", MAGNET_ENV_PHYICAL_PATH },
{ "physical.rel-path", MAGNET_ENV_PHYICAL_REL_PATH },
{ "physical.doc-root", MAGNET_ENV_PHYICAL_DOC_ROOT },
{ "physical.basedir", MAGNET_ENV_PHYICAL_BASEDIR },
{ "uri.path", MAGNET_ENV_URI_PATH },
{ "uri.path-raw", MAGNET_ENV_URI_PATH_RAW },
{ "uri.scheme", MAGNET_ENV_URI_SCHEME },
{ "uri.authority", MAGNET_ENV_URI_AUTHORITY },
{ "uri.query", MAGNET_ENV_URI_QUERY },
{ "request.method", MAGNET_ENV_REQUEST_METHOD },
{ "request.uri", MAGNET_ENV_REQUEST_URI },
{ "request.orig-uri", MAGNET_ENV_REQUEST_ORIG_URI },
{ "request.path-info", MAGNET_ENV_REQUEST_PATH_INFO },
{ "request.remote-ip", MAGNET_ENV_REQUEST_REMOTE_IP },
{ "request.protocol", MAGNET_ENV_REQUEST_PROTOCOL },
{ NULL, MAGNET_ENV_UNSET }
};
static buffer *magnet_env_get_buffer_by_id(server *srv, connection *con, int id) {
buffer *dest = NULL;
UNUSED(srv);
/**
* map all internal variables to lua
*
*/
switch (id) {
case MAGNET_ENV_PHYICAL_PATH: dest = con->physical.path; break;
case MAGNET_ENV_PHYICAL_REL_PATH: dest = con->physical.rel_path; break;
case MAGNET_ENV_PHYICAL_DOC_ROOT: dest = con->physical.doc_root; break;
case MAGNET_ENV_PHYICAL_BASEDIR: dest = con->physical.basedir; break;
case MAGNET_ENV_URI_PATH: dest = con->uri.path; break;
case MAGNET_ENV_URI_PATH_RAW: dest = con->uri.path_raw; break;
case MAGNET_ENV_URI_SCHEME: dest = con->uri.scheme; break;
case MAGNET_ENV_URI_AUTHORITY: dest = con->uri.authority; break;
case MAGNET_ENV_URI_QUERY: dest = con->uri.query; break;
case MAGNET_ENV_REQUEST_METHOD:
buffer_copy_string(srv->tmp_buf, get_http_method_name(con->request.http_method));
dest = srv->tmp_buf;
break;
case MAGNET_ENV_REQUEST_URI: dest = con->request.uri; break;
case MAGNET_ENV_REQUEST_ORIG_URI: dest = con->request.orig_uri; break;
case MAGNET_ENV_REQUEST_PATH_INFO: dest = con->request.pathinfo; break;
case MAGNET_ENV_REQUEST_REMOTE_IP: dest = con->dst_addr_buf; break;
case MAGNET_ENV_REQUEST_PROTOCOL:
buffer_copy_string(srv->tmp_buf, get_http_version_name(con->request.http_version));
dest = srv->tmp_buf;
break;
case MAGNET_ENV_UNSET: break;
}
return dest;
}
static buffer *magnet_env_get_buffer(server *srv, connection *con, const char *key) {
size_t i;
for (i = 0; magnet_env[i].name; i++) {
if (0 == strcmp(key, magnet_env[i].name)) break;
}
return magnet_env_get_buffer_by_id(srv, con, magnet_env[i].type);
}
static int magnet_env_get(lua_State *L) {
server *srv = magnet_get_server(L);
connection *con = magnet_get_connection(L);
/* __index: param 1 is the (empty) table the value was not found in */
const char *key = luaL_checkstring(L, 2);
buffer *dest = NULL;
dest = magnet_env_get_buffer(srv, con, key);
if (!buffer_is_empty(dest)) {
lua_pushlstring(L, CONST_BUF_LEN(dest));
} else {
lua_pushnil(L);
}
return 1;
}
static int magnet_env_set(lua_State *L) {
server *srv = magnet_get_server(L);
connection *con = magnet_get_connection(L);
/* __newindex: param 1 is the (empty) table the value is supposed to be set in */
const char *key = luaL_checkstring(L, 2);
buffer *dest = NULL;
luaL_checkany(L, 3); /* nil or a string */
if (NULL != (dest = magnet_env_get_buffer(srv, con, key))) {
if (lua_isnil(L, 3)) {
buffer_reset(dest);
} else {
const_buffer val = magnet_checkconstbuffer(L, 3);
buffer_copy_string_len(dest, val.ptr, val.len);
}
} else {
/* couldn't save */
return luaL_error(L, "couldn't store '%s' in lighty.env[]", key);
}
return 0;
}
static int magnet_env_next(lua_State *L) {
server *srv = magnet_get_server(L);
connection *con = magnet_get_connection(L);
const int pos = lua_tointeger(L, lua_upvalueindex(1));
buffer *dest;
/* ignore previous key: use upvalue for current pos */
lua_settop(L, 0);
if (NULL == magnet_env[pos].name) return 0; /* end of list */
/* Update our positional upval to reflect our new current position */
lua_pushinteger(L, pos + 1);
lua_replace(L, lua_upvalueindex(1));
/* key to return */
lua_pushstring(L, magnet_env[pos].name);
/* get value */
dest = magnet_env_get_buffer_by_id(srv, con, magnet_env[pos].type);
if (!buffer_is_empty(dest)) {
lua_pushlstring(L, CONST_BUF_LEN(dest));
} else {
lua_pushnil(L);
}
/* return 2 items on the stack (key, value) */
return 2;
}
static int magnet_env_pairs(lua_State *L) {
lua_pushinteger(L, 0); /* Push our current pos (the start) into upval 1 */
lua_pushcclosure(L, magnet_env_next, 1); /* Push our new closure with 1 upvals */
return 1;
}
static int magnet_cgi_get(lua_State *L) {
connection *con = magnet_get_connection(L);
data_string *ds;
/* __index: param 1 is the (empty) table the value was not found in */
const char *key = luaL_checkstring(L, 2);
ds = (data_string *)array_get_element(con->environment, key);
if (NULL != ds && !buffer_is_empty(ds->value))
lua_pushlstring(L, CONST_BUF_LEN(ds->value));
else
lua_pushnil(L);
return 1;
}
static int magnet_cgi_set(lua_State *L) {
connection *con = magnet_get_connection(L);
/* __newindex: param 1 is the (empty) table the value is supposed to be set in */
const_buffer key = magnet_checkconstbuffer(L, 2);
const_buffer val = magnet_checkconstbuffer(L, 2);
array_set_key_value(con->environment, key.ptr, key.len, val.ptr, val.len);
return 0;
}
static int magnet_cgi_pairs(lua_State *L) {
connection *con = magnet_get_connection(L);
return magnet_array_pairs(L, con->environment);
}
static int magnet_copy_response_header(server *srv, connection *con, lua_State *L, int lighty_table_ndx) {
force_assert(lua_istable(L, lighty_table_ndx));
lua_getfield(L, lighty_table_ndx, "header"); /* lighty.header */
if (lua_istable(L, -1)) {
/* header is found, and is a table */
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
if (lua_isstring(L, -1) && lua_isstring(L, -2)) {
const_buffer key = magnet_checkconstbuffer(L, -2);
const_buffer val = magnet_checkconstbuffer(L, -1);
response_header_overwrite(srv, con, key.ptr, key.len, val.ptr, val.len);
}
lua_pop(L, 1);
}
}
lua_pop(L, 1); /* pop lighty.header */
return 0;
}
/**
* walk through the content array
*
* content = { "<pre>", { file = "/content" } , "</pre>" }
*
* header["Content-Type"] = "text/html"
*
* return 200
*/
static int magnet_attach_content(server *srv, connection *con, lua_State *L, int lighty_table_ndx) {
force_assert(lua_istable(L, lighty_table_ndx));
lua_getfield(L, lighty_table_ndx, "content"); /* lighty.content */
if (lua_istable(L, -1)) {
int i;
/* content is found, and is a table */
for (i = 1; ; i++) {
lua_rawgeti(L, -1, i);
/* -1 is the value and should be the value ... aka a table */
if (lua_isstring(L, -1)) {
const_buffer data = magnet_checkconstbuffer(L, -1);
chunkqueue_append_mem(con->write_queue, data.ptr, data.len);
} else if (lua_istable(L, -1)) {
lua_getfield(L, -1, "filename");
lua_getfield(L, -2, "length"); /* (0-based) end of range (not actually "length") */
lua_getfield(L, -3, "offset"); /* (0-based) start of range */
if (lua_isstring(L, -3)) { /* filename has to be a string */
buffer *fn = magnet_checkbuffer(L, -3);
off_t off = (off_t) luaL_optinteger(L, -1, 0);
off_t len = (off_t) luaL_optinteger(L, -2, -1); /*(-1 to http_chunk_append_file_range() uses file size minus offset)*/
if (off < 0) {
buffer_free(fn);
return luaL_error(L, "offset for '%s' is negative", lua_tostring(L, -3));
}
if (len >= off) {
len -= off;
} else if (-1 != len) {
buffer_free(fn);
return luaL_error(L, "offset > length for '%s'", lua_tostring(L, -3));
}
if (0 != len && 0 != http_chunk_append_file_range(srv, con, fn, off, len)) {
buffer_free(fn);
return luaL_error(L, "error opening file content '%s' at offset %lld", lua_tostring(L, -3), (long long)off);
}
buffer_free(fn);
} else {
return luaL_error(L, "content[%d] is a table and requires the field \"filename\"", i);
}
lua_pop(L, 3);
} else if (lua_isnil(L, -1)) {
/* end of list */
lua_pop(L, 1);
break;
} else {
return luaL_error(L, "content[%d] is neither a string nor a table: ", i);
}
lua_pop(L, 1); /* pop the content[...] entry value */
}
} else {
return luaL_error(L, "lighty.content has to be a table");
}
lua_pop(L, 1); /* pop lighty.content */
return 0;
}
static int traceback(lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getglobal(L, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
/* push traceback function before calling lua_pcall after narg arguments
* have been pushed (inserts it before the arguments). returns index for
* traceback function ("msgh" in lua_pcall)
*/
static int push_traceback(lua_State *L, int narg) {
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback);
lua_insert(L, base);
return base;
}
static handler_t magnet_attract(server *srv, connection *con, plugin_data *p, buffer *name) {
lua_State *L;
int lua_return_value;
const int func_ndx = 1;
const int lighty_table_ndx = 2;
/* get the script-context */
L = script_cache_get_script(srv, con, p->cache, name);
if (lua_isstring(L, -1)) {
log_error_write(srv, __FILE__, __LINE__,
"sbss",
"loading script",
name,
"failed:",
lua_tostring(L, -1));
lua_pop(L, 1);
force_assert(lua_gettop(L) == 0); /* only the error should have been on the stack */
con->http_status = 500;
con->mode = DIRECT;
return HANDLER_FINISHED;
}
force_assert(lua_gettop(L) == 1);
force_assert(lua_isfunction(L, func_ndx));
lua_pushlightuserdata(L, srv);
lua_setfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_SERVER);
lua_pushlightuserdata(L, con);
lua_setfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_CONNECTION);
lua_atpanic(L, magnet_atpanic);
/**
* we want to create empty environment for our script
*
* setmetatable({}, {__index = _G})
*
* if a function symbol is not defined in our env, __index will lookup
* in the global env.
*
* all variables created in the script-env will be thrown
* away at the end of the script run.
*/
lua_newtable(L); /* my empty environment aka {} (sp += 1) */
/* we have to overwrite the print function */
lua_pushcfunction(L, magnet_print); /* (sp += 1) */
lua_setfield(L, -2, "print"); /* -1 is the env we want to set(sp -= 1) */
/**
* lighty.request[] (ro) has the HTTP-request headers
* lighty.env[] (rw) has various url/physical file paths and
* request meta data; might contain nil values
* lighty.req_env[] (ro) has the cgi environment
* lighty.status[] (ro) has the status counters
* lighty.content[] (rw) is a table of string/file
* lighty.header[] (rw) is a array to set response headers
*/
lua_newtable(L); /* lighty.* (sp += 1) */
lua_newtable(L); /* {} (sp += 1) */
lua_newtable(L); /* the meta-table for the request-table (sp += 1) */
lua_pushcfunction(L, magnet_reqhdr_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_reqhdr_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to request (sp -= 1) */
lua_setfield(L, -2, "request"); /* content = {} (sp -= 1) */
lua_newtable(L); /* {} (sp += 1) */
lua_newtable(L); /* the meta-table for the env-table (sp += 1) */
lua_pushcfunction(L, magnet_env_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_env_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_env_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to env (sp -= 1) */
lua_setfield(L, -2, "env"); /* content = {} (sp -= 1) */
lua_newtable(L); /* {} (sp += 1) */
lua_newtable(L); /* the meta-table for the req_env-table (sp += 1) */
lua_pushcfunction(L, magnet_cgi_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_cgi_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_cgi_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to req_env (sp -= 1) */
lua_setfield(L, -2, "req_env"); /* content = {} (sp -= 1) */
lua_newtable(L); /* {} (sp += 1) */
lua_newtable(L); /* the meta-table for the status-table (sp += 1) */
lua_pushcfunction(L, magnet_status_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_status_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_status_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to statzs (sp -= 1) */
lua_setfield(L, -2, "status"); /* content = {} (sp -= 1) */
/* add empty 'content' and 'header' tables */
lua_newtable(L); /* {} (sp += 1) */
lua_setfield(L, -2, "content"); /* content = {} (sp -= 1) */
lua_newtable(L); /* {} (sp += 1) */
lua_setfield(L, -2, "header"); /* header = {} (sp -= 1) */
lua_pushinteger(L, MAGNET_RESTART_REQUEST);
lua_setfield(L, -2, "RESTART_REQUEST");
lua_pushcfunction(L, magnet_stat); /* (sp += 1) */
lua_setfield(L, -2, "stat"); /* -1 is the env we want to set (sp -= 1) */
/* insert lighty table at index 2 */
lua_pushvalue(L, -1);
lua_insert(L, lighty_table_ndx);
lua_setfield(L, -2, "lighty"); /* lighty.* (sp -= 1) */
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502
/* override the default pairs() function to our __pairs capable version;
* not needed for lua 5.2+
*/
lua_getglobal(L, "pairs"); /* push original pairs() (sp += 1) */
lua_pushcclosure(L, magnet_pairs, 1);
lua_setfield(L, -2, "pairs"); /* (sp -= 1) */
#endif
lua_newtable(L); /* the meta-table for the new env (sp += 1) */
lua_pushglobaltable(L); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* { __index = _G } (sp -= 1) */
lua_setmetatable(L, -2); /* setmetatable({}, {__index = _G}) (sp -= 1) */
magnet_setfenv_mainfn(L, 1); /* (sp -= 1) */
/* pcall will destroy the func value, duplicate it */ /* (sp += 1) */
lua_pushvalue(L, func_ndx);
{
int errfunc = push_traceback(L, 0);
int ret = lua_pcall(L, 0, 1, errfunc);
lua_remove(L, errfunc);
/* reset environment */
lua_pushglobaltable(L); /* (sp += 1) */
magnet_setfenv_mainfn(L, 1); /* (sp -= 1) */
if (0 != ret) {
log_error_write(srv, __FILE__, __LINE__,
"ss",
"lua_pcall():",
lua_tostring(L, -1));
lua_pop(L, 2); /* remove the error-msg and the lighty table at index 2 */
force_assert(lua_gettop(L) == 1); /* only the function should be on the stack */
con->http_status = 500;
con->mode = DIRECT;
return HANDLER_FINISHED;
}
}
/* we should have the function, the lighty table and the return value on the stack */
force_assert(lua_gettop(L) == 3);
lua_return_value = (int) luaL_optinteger(L, -1, -1);
lua_pop(L, 1); /* pop return value */
magnet_copy_response_header(srv, con, L, lighty_table_ndx);
{
handler_t result = HANDLER_GO_ON;
if (lua_return_value > 99) {
con->http_status = lua_return_value;
con->file_finished = 1;
/* try { ...*/
if (0 == setjmp(exceptionjmp)) {
magnet_attach_content(srv, con, L, lighty_table_ndx);
if (!chunkqueue_is_empty(con->write_queue)) {
con->mode = p->id;
}
} else {
lua_settop(L, 2); /* remove all but function and lighty table */
/* } catch () { */
con->http_status = 500;
con->mode = DIRECT;
}
result = HANDLER_FINISHED;
} else if (MAGNET_RESTART_REQUEST == lua_return_value) {
result = HANDLER_COMEBACK;
}
lua_pop(L, 1); /* pop the lighty table */
force_assert(lua_gettop(L) == 1); /* only the function should remain on the stack */
return result;
}
}
static handler_t magnet_attract_array(server *srv, connection *con, plugin_data *p, array *files) {
size_t i;
handler_t ret = HANDLER_GO_ON;
/* no filename set */
if (files->used == 0) return HANDLER_GO_ON;
/**
* execute all files and jump out on the first !HANDLER_GO_ON
*/
for (i = 0; i < files->used && ret == HANDLER_GO_ON; i++) {
data_string *ds = (data_string *)files->data[i];
if (buffer_string_is_empty(ds->value)) continue;
ret = magnet_attract(srv, con, p, ds->value);
}
if (con->error_handler_saved_status) {
/* retrieve (possibly modified) REDIRECT_STATUS and store as number */
unsigned long x;
data_string * const ds = (data_string *)array_get_element(con->environment, "REDIRECT_STATUS");
if (ds && (x = strtoul(ds->value->ptr, NULL, 10)) < 1000)
/*(simplified validity check x < 1000)*/
con->error_handler_saved_status =
con->error_handler_saved_status > 0 ? (int)x : -(int)x;
}
return ret;
}
URIHANDLER_FUNC(mod_magnet_uri_handler) {
plugin_data *p = p_d;
mod_magnet_patch_connection(srv, con, p);
return magnet_attract_array(srv, con, p, p->conf.url_raw);
}
URIHANDLER_FUNC(mod_magnet_physical) {
plugin_data *p = p_d;
mod_magnet_patch_connection(srv, con, p);
return magnet_attract_array(srv, con, p, p->conf.physical_path);
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_magnet_plugin_init(plugin *p);
int mod_magnet_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("magnet");
p->init = mod_magnet_init;
p->handle_uri_clean = mod_magnet_uri_handler;
p->handle_physical = mod_magnet_physical;
p->set_defaults = mod_magnet_set_defaults;
p->cleanup = mod_magnet_free;
p->data = NULL;
return 0;
}
#else
#pragma message("lua is required, but was not found")
int mod_magnet_plugin_init(plugin *p);
int mod_magnet_plugin_init(plugin *p) {
UNUSED(p);
return -1;
}
#endif