lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "sys-crypto-md.h"
#include "algo_hmac.h"
#include "base.h"
#include "base64.h"
#include "burl.h"
#include "log.h"
#include "buffer.h"
#include "chunk.h"
#include "ck.h"
#include "http_chunk.h"
#include "http_etag.h"
#include "http_header.h"
#include "rand.h"
#include "response.h" /* http_response_send_1xx() */
#include "plugin.h"
#include "mod_magnet_cache.h"
#include "sock_addr.h"
#include "stat_cache.h"
#include "status_counter.h"
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <lua.h>
#include <lauxlib.h>
#define LUA_RIDX_LIGHTTPD_REQUEST "lighty.request"
#define MAGNET_RESTART_REQUEST 99
/* plugin config for all request/connections */
static jmp_buf exceptionjmp;
typedef struct {
script * const *url_raw;
script * const *physical_path;
script * const *response_start;
int stage;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
script_cache cache;
} plugin_data;
INIT_FUNC(mod_magnet_init) {
return calloc(1, sizeof(plugin_data));
}
FREE_FUNC(mod_magnet_free) {
plugin_data * const p = p_d;
script_cache_free_data(&p->cache);
if (NULL == p->cvlist) return;
/* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1], used = p->nconfig; i < used; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
if (cpv->vtype != T_CONFIG_LOCAL || NULL == cpv->v.v) continue;
switch (cpv->k_id) {
case 0: /* magnet.attract-raw-url-to */
case 1: /* magnet.attract-physical-path-to */
case 2: /* magnet.attract-response-start-to */
free(cpv->v.v);
break;
default:
break;
}
}
}
}
static void mod_magnet_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
if (cpv->vtype != T_CONFIG_LOCAL)
return;
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* magnet.attract-raw-url-to */
pconf->url_raw = cpv->v.v;
break;
case 1: /* magnet.attract-physical-path-to */
pconf->physical_path = cpv->v.v;
break;
case 2: /* magnet.attract-response-start-to */
pconf->response_start = cpv->v.v;
break;
default:/* should not happen */
return;
}
}
static void mod_magnet_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_magnet_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_magnet_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_magnet_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_magnet_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("magnet.attract-raw-url-to"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("magnet.attract-physical-path-to"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("magnet.attract-response-start-to"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_magnet"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* magnet.attract-raw-url-to */
case 1: /* magnet.attract-physical-path-to */
case 2: /* magnet.attract-response-start-to */
if (0 == cpv->v.a->used) {
cpv->v.v = NULL;
cpv->vtype = T_CONFIG_LOCAL;
}
else {
script ** const a =
malloc(sizeof(script *)*(cpv->v.a->used+1));
force_assert(a);
for (uint32_t j = 0; j < cpv->v.a->used; ++j) {
data_string *ds = (data_string *)cpv->v.a->data[j];
if (buffer_is_blank(&ds->value)) {
log_error(srv->errh, __FILE__, __LINE__,
"unexpected (blank) value for %s; "
"expected list of \"scriptpath\"", cpk[cpv->k_id].k);
free(a);
return HANDLER_ERROR;
}
a[j] = script_cache_get_script(&p->cache, &ds->value);
}
a[cpv->v.a->used] = NULL;
cpv->v.v = a;
cpv->vtype = T_CONFIG_LOCAL;
}
break;
default:/* should not happen */
break;
}
}
}
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_magnet_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
#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 5.1 deprecated luaL_getn() for lua_objlen() */
/* lua 5.2 renamed lua_objlen() to lua_rawlen() */
#define lua_rawlen lua_objlen
/* lua 5.2 deprecated luaL_register() for luaL_setfuncs()
* (this define is valid only when 0 == nup) */
#define luaL_setfuncs(L, l, nup) luaL_register((L), NULL, (l))
#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
static int magnet_newindex_readonly(lua_State *L) {
lua_pushliteral(L, "lua table is read-only");
return lua_error(L);
}
static void magnet_push_buffer(lua_State *L, const buffer *b) {
if (b && !buffer_is_unset(b))
lua_pushlstring(L, BUF_PTR_LEN(b));
else
lua_pushnil(L);
}
#if 0
static int magnet_array_get_element(lua_State *L, const array *a) {
/* __index: param 1 is the (empty) table the value was not found in */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
const data_string * const ds = (const data_string *)
array_get_element_klen(a, k, klen);
magnet_push_buffer(L, NULL != ds ? &ds->value : NULL);
return 1;
}
#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, BUF_PTR_LEN(&du->key));
switch (du->type) {
case TYPE_STRING:
ds = (data_string *)du;
magnet_push_buffer(L, &ds->value);
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 request_st * magnet_get_request(lua_State *L) {
lua_getfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_REQUEST);
request_st * const r = lua_touserdata(L, -1);
lua_pop(L, 1);
return r;
}
typedef struct {
const char *ptr;
size_t len;
} const_buffer;
static const_buffer magnet_checkconstbuffer(lua_State *L, int idx) {
const_buffer cb;
cb.ptr = luaL_checklstring(L, idx, &cb.len);
return cb;
}
static const buffer* magnet_checkbuffer(lua_State *L, int idx, buffer *b) {
const_buffer cb = magnet_checkconstbuffer(L, idx);
/* assign result into (buffer *), and return (const buffer *)
* (note: caller must not free result) */
*(const char **)&b->ptr = cb.ptr;
b->used = cb.len+1;
b->size = 0;
return b;
}
static int magnet_print(lua_State *L) {
const_buffer cb = magnet_checkconstbuffer(L, 1);
request_st * const r = magnet_get_request(L);
log_error(r->conf.errh, __FILE__, __LINE__, "(lua-print) %s", cb.ptr);
return 0;
}
static int magnet_stat_field(lua_State *L) {
if (lua_gettop(L) != 2)
return 0; /*(should not happen; __index method in protected metatable)*/
stat_cache_entry * const sce = *(stat_cache_entry **)lua_touserdata(L, -2);
const_buffer k = magnet_checkconstbuffer(L, -1);
switch (k.ptr[0]) {
case 'c': { /* content-type */
if (0 != strcmp(k.ptr, "content-type")) break;
request_st * const r = magnet_get_request(L);
const buffer *content_type = stat_cache_content_type_get(sce, r);
if (content_type && !buffer_is_blank(content_type))
lua_pushlstring(L, BUF_PTR_LEN(content_type));
else
lua_pushnil(L);
return 1;
}
case 'e': { /* etag */
if (0 != strcmp(k.ptr, "etag")) break;
request_st * const r = magnet_get_request(L);
const buffer *etag = stat_cache_etag_get(sce, r->conf.etag_flags);
if (etag && !buffer_is_blank(etag))
lua_pushlstring(L, BUF_PTR_LEN(etag));
else
lua_pushnil(L);
return 1;
}
case 'i': /* is_* */
if (k.len < 4) break;
switch (k.ptr[3]) {
case 'b': /* is_block */
if (0 == strcmp(k.ptr, "is_block")) {
lua_pushboolean(L, S_ISBLK(sce->st.st_mode));
return 1;
}
break;
case 'c': /* is_char */
if (0 == strcmp(k.ptr, "is_char")) {
lua_pushboolean(L, S_ISCHR(sce->st.st_mode));
return 1;
}
break;
case 'd': /* is_dir */
if (0 == strcmp(k.ptr, "is_dir")) {
lua_pushboolean(L, S_ISDIR(sce->st.st_mode));
return 1;
}
break;
case 'f': /* is_file is_fifo */
if (0 == strcmp(k.ptr, "is_file")) {
lua_pushboolean(L, S_ISREG(sce->st.st_mode));
return 1;
}
if (0 == strcmp(k.ptr, "is_fifo")) {
lua_pushboolean(L, S_ISFIFO(sce->st.st_mode));
return 1;
}
break;
case 'l': /* is_link */
if (0 == strcmp(k.ptr, "is_link")) {
lua_pushboolean(L, S_ISLNK(sce->st.st_mode));
return 1;
}
break;
case 's': /* is_socket */
if (0 == strcmp(k.ptr, "is_socket")) {
lua_pushboolean(L, S_ISSOCK(sce->st.st_mode));
return 1;
}
break;
default:
break;
}
break;
case 's': /* st_* */
if (k.len < 4) break;
switch (k.ptr[3]) {
case 'a': /* st_atime */
if (0 == strcmp(k.ptr, "st_atime")) {
lua_pushinteger(L, TIME64_CAST(sce->st.st_atime));
return 1;
}
break;
case 'c': /* st_ctime */
if (0 == strcmp(k.ptr, "st_ctime")) {
lua_pushinteger(L, TIME64_CAST(sce->st.st_ctime));
return 1;
}
break;
case 'i': /* st_ino */
if (0 == strcmp(k.ptr, "st_ino")) {
lua_pushinteger(L, sce->st.st_ino);
return 1;
}
break;
case 'm': /* st_mtime st_mode */
if (0 == strcmp(k.ptr, "st_mtime")) {
lua_pushinteger(L, TIME64_CAST(sce->st.st_mtime));
return 1;
}
if (0 == strcmp(k.ptr, "st_mode")) {
lua_pushinteger(L, sce->st.st_mode);
return 1;
}
break;
case 'g': /* st_gid */
if (0 == strcmp(k.ptr, "st_gid")) {
lua_pushinteger(L, sce->st.st_gid);
return 1;
}
break;
case 's': /* st_size */
if (0 == strcmp(k.ptr, "st_size")) {
lua_pushinteger(L, sce->st.st_size);
return 1;
}
break;
case 'u': /* st_uid */
if (0 == strcmp(k.ptr, "st_uid")) {
lua_pushinteger(L, sce->st.st_uid);
return 1;
}
break;
default:
break;
}
break;
default:
break;
}
lua_pushliteral(L, "stat[\"field\"] invalid: ");
lua_pushvalue(L, -2); /* field */
lua_concat(L, 2);
lua_error(L);
return 0;
}
__attribute_cold__
static int magnet_stat_pairs_noimpl_iter(lua_State *L) {
request_st * const r = magnet_get_request(L);
log_error(r->conf.errh, __FILE__, __LINE__,
"(lua) pairs() not implemented on lighty.stat object; "
"returning empty iter");
return 0;
}
__attribute_cold__
static int magnet_stat_pairs_noimpl(lua_State *L) {
lua_pushcclosure(L, magnet_stat_pairs_noimpl_iter, 0);
return 1;
}
static void magnet_stat_metatable(lua_State *L) {
if (luaL_newmetatable(L, "lighty.stat")) { /* (sp += 1) */
lua_pushcfunction(L, magnet_stat_field); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_newindex_readonly); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_stat_pairs_noimpl); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
}
}
static int magnet_stat(lua_State *L) {
buffer stor; /*(note: do not free magnet_checkbuffer() result)*/
const buffer * const sb = magnet_checkbuffer(L, 1, &stor);
stat_cache_entry * const sce = (!buffer_is_blank(sb))
? stat_cache_get_entry(sb)
: NULL;
if (NULL == sce) {
lua_pushnil(L);
return 1;
}
/* note: caching sce valid only for procedural script which does not yield;
* (sce might not be valid if script yields and is later resumed)
* (script must not cache sce in persistent global state for later use)
* (If we did want sce to be persistent, then could increment sce refcnt,
* and set up __gc metatable method to decrement sce refcnt) */
stat_cache_entry ** const udata = /* (sp += 1) */
(struct stat_cache_entry **)lua_newuserdata(L, sizeof(stat_cache_entry *));
*udata = sce;
magnet_stat_metatable(L); /* (sp += 1) */
lua_setmetatable(L, -2); /* (sp -= 1) */
return 1;
}
static int magnet_time(lua_State *L) {
lua_pushinteger(L, (lua_Integer)log_epoch_secs);
return 1;
}
static int magnet_rand(lua_State *L) {
lua_pushinteger(L, (lua_Integer)li_rand_pseudo());
return 1;
}
static int magnet_md_once(lua_State *L) {
if (lua_gettop(L) != 2) {
lua_pushliteral(L,
"lighty.c.md(algo, data): incorrect number of arguments");
return lua_error(L);
}
const_buffer algo = magnet_checkconstbuffer(L, -2);
const_buffer msg = magnet_checkconstbuffer(L, -1);
uint8_t digest[MD_DIGEST_LENGTH_MAX];
uint32_t dlen = 0;
switch (algo.len) {
#ifdef USE_LIB_CRYPTO
case 6:
#ifdef USE_LIB_CRYPTO_SHA512
if (0 == memcmp(algo.ptr, "sha512", 6)) {
SHA512_once(digest, msg.ptr, msg.len);
dlen = SHA512_DIGEST_LENGTH;
break;
}
#endif
#ifdef USE_LIB_CRYPTO_SHA256
if (0 == memcmp(algo.ptr, "sha256", 6)) {
SHA256_once(digest, msg.ptr, msg.len);
dlen = SHA256_DIGEST_LENGTH;
break;
}
#endif
break;
case 4:
#ifdef USE_LIB_CRYPTO_SHA1
if (0 == memcmp(algo.ptr, "sha1", 4)) {
SHA1_once(digest, msg.ptr, msg.len);
dlen = SHA1_DIGEST_LENGTH;
break;
}
#endif
break;
#endif
case 3:
if (0 == memcmp(algo.ptr, "md5", 3)) {
MD5_once(digest, msg.ptr, msg.len);
dlen = MD5_DIGEST_LENGTH;
break;
}
break;
default:
break;
}
if (dlen) {
char dighex[MD_DIGEST_LENGTH_MAX*2+1];
li_tohex_uc(dighex, sizeof(dighex), (char *)digest, dlen);
lua_pushlstring(L, dighex, dlen*2);
}
else
lua_pushnil(L);
return 1;
}
static int magnet_hmac_once(lua_State *L) {
if (lua_gettop(L) != 3) {
lua_pushliteral(L,
"lighty.c.hmac(algo, secret, data): incorrect number of arguments");
return lua_error(L);
}
const_buffer algo = magnet_checkconstbuffer(L, -3);
const_buffer secret = magnet_checkconstbuffer(L, -2);
const_buffer msg = magnet_checkconstbuffer(L, -1);
const uint8_t * const msgptr = (uint8_t *)msg.ptr;
uint8_t digest[MD_DIGEST_LENGTH_MAX];
uint32_t dlen = 0;
int rc = 0;
switch (algo.len) {
#ifdef USE_LIB_CRYPTO
case 6:
#ifdef USE_LIB_CRYPTO_SHA512
if (0 == memcmp(algo.ptr, "sha512", 6)) {
rc = li_hmac_sha512(digest,secret.ptr,secret.len,msgptr,msg.len);
dlen = SHA512_DIGEST_LENGTH;
break;
}
#endif
#ifdef USE_LIB_CRYPTO_SHA256
if (0 == memcmp(algo.ptr, "sha256", 6)) {
rc = li_hmac_sha256(digest,secret.ptr,secret.len,msgptr,msg.len);
dlen = SHA256_DIGEST_LENGTH;
break;
}
#endif
break;
case 4:
#ifdef USE_LIB_CRYPTO_SHA1
if (0 == memcmp(algo.ptr, "sha1", 4)) {
rc = li_hmac_sha1(digest,secret.ptr,secret.len,msgptr,msg.len);
dlen = SHA1_DIGEST_LENGTH;
break;
}
#endif
break;
#endif
case 3:
if (0 == memcmp(algo.ptr, "md5", 3)) {
rc = li_hmac_md5(digest,secret.ptr,secret.len,msgptr,msg.len);
dlen = MD5_DIGEST_LENGTH;
break;
}
break;
default:
break;
}
if (rc) {
char dighex[MD_DIGEST_LENGTH_MAX*2+1];
li_tohex_uc(dighex, sizeof(dighex), (char *)digest, dlen);
lua_pushlstring(L, dighex, dlen*2);
}
else
lua_pushnil(L);
return 1;
}
static int magnet_digest_eq(lua_State *L) {
if (lua_gettop(L) != 2) {
lua_pushliteral(L,
"lighty.c.digest_eq(d1, d2): incorrect number of arguments");
return lua_error(L);
}
const_buffer d1 = magnet_checkconstbuffer(L, -2);
const_buffer d2 = magnet_checkconstbuffer(L, -1);
/* convert hex to binary: validate hex and eliminate hex case comparison */
uint8_t b1[MD_DIGEST_LENGTH_MAX];
uint8_t b2[MD_DIGEST_LENGTH_MAX];
int rc = (d1.len == d2.len)
&& 0 == li_hex2bin(b1, sizeof(b1), d1.ptr, d1.len)
&& 0 == li_hex2bin(b2, sizeof(b2), d2.ptr, d2.len)
&& ck_memeq_const_time_fixed_len(b1, b2, d2.len >> 1);
lua_pushboolean(L, rc);
return 1;
}
static int magnet_secret_eq(lua_State *L) {
if (lua_gettop(L) != 2) {
lua_pushliteral(L,
"lighty.c.secret_eq(d1, d2): incorrect number of arguments");
return lua_error(L);
}
const_buffer d1 = magnet_checkconstbuffer(L, -2);
const_buffer d2 = magnet_checkconstbuffer(L, -1);
lua_pushboolean(L, ck_memeq_const_time(d1.ptr, d1.len, d2.ptr, d2.len));
return 1;
}
static int magnet_b64dec(lua_State *L, base64_charset dict) {
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
if (buffer_append_base64_decode(b, s.ptr, s.len, dict))
lua_pushlstring(L, BUF_PTR_LEN(b));
else
lua_pushnil(L);
chunk_buffer_release(b);
return 1;
}
static int magnet_b64enc(lua_State *L, base64_charset dict) {
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer_append_base64_encode_no_padding(b, (uint8_t *)s.ptr, s.len, dict);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static int magnet_b64urldec(lua_State *L) {
return magnet_b64dec(L, BASE64_URL);
}
static int magnet_b64urlenc(lua_State *L) {
return magnet_b64enc(L, BASE64_URL);
}
static int magnet_b64stddec(lua_State *L) {
return magnet_b64dec(L, BASE64_STANDARD);
}
static int magnet_b64stdenc(lua_State *L) {
return magnet_b64enc(L, BASE64_STANDARD);
}
static int magnet_hexdec(lua_State *L) {
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
uint8_t * const p = (uint8_t *)buffer_extend(b, s.len >> 1);
int rc = li_hex2bin(p, s.len >> 1, s.ptr, s.len);
if (0 == rc)
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return rc+1; /* 1 on success (pushed string); 0 on failure (no value) */
}
static int magnet_hexenc(lua_State *L) {
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer_append_string_encoded_hex_uc(b, s.ptr, s.len);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1; /* uppercase hex string; use lua s = s:lower() to lowercase */
}
static int magnet_xmlenc(lua_State *L) {
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
#if 1
buffer_append_string_encoded(b, s.ptr, s.len, ENCODING_MINIMAL_XML);
#else
const char *e;
size_t i, n, elen;
for (i = 0, n = 0; i < s.len; ++i) {
switch (s.ptr[i]) {
default: continue;
case '<': e = "&lt;"; elen = sizeof("&lt;")-1; break;
case '>': e = "&gt;"; elen = sizeof("&gt;")-1; break;
case '&': e = "&amp;"; elen = sizeof("&amp;")-1; break;
case '\'': e = "&apos;"; elen = sizeof("&apos;")-1; break;
case '"': e = "&quot;"; elen = sizeof("&quot;")-1; break;
/*(XXX: would be good idea to add CTRLs, DEL, '`' */
}
buffer_append_str2(b, s.ptr+n, i-n, e, elen);
n = i+1;
}
if (i-n)
buffer_append_string_len(b, s.ptr+n, i-n);
#endif
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static int magnet_urldec(lua_State *L) {
/* url-decode and replace non-printable chars with '_'
* This function should not be used on query-string unless it is used on
* portions of query-string after splitting on '&', replacing '+' w/ ' ' */
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer_copy_string_len(b, s.ptr, s.len);
buffer_urldecode_path(b);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static int magnet_urlenc(lua_State *L) {
/* url-encode path
* ('?' is encoded, if present)
* caller must split string if '?' is part of query-string)
* ('/' is not encoded; caller must encode if not path separator) */
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer_append_string_encoded(b, s.ptr, s.len, ENCODING_REL_URI);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static void magnet_urldec_query_part(buffer * const b, const char *s, const size_t slen) {
buffer_clear(b);
char *p = buffer_extend(b, slen);
for (size_t i = 0; i < slen; ++i)
p[i] = (s[i] != '+') ? s[i] : ' ';
buffer_urldecode_path(b);
}
static int magnet_urldec_query(lua_State *L) {
/* split on '&' and '=', url-decode and replace non-printable chars w/ '_',
* and store components in table
* (string input should be query-string without leading '?')
* (note: duplicated keys replace earlier values, but this interface returns
* an table useful for lookups, so this limitation is often acceptable) */
lua_createtable(L, 0, 0);
if (lua_isnil(L, -1)) {
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
return 1;
}
buffer * const k = chunk_buffer_acquire();
buffer * const v = chunk_buffer_acquire();
for (const char *qs = s.ptr, *eq, *amp; *qs; qs = amp+1) {
for (amp = qs, eq = NULL; *amp && *amp != '&'; ++amp) {
if (*amp == '=' && !eq) eq = amp;
}
if (amp != qs) {
if (eq) {
magnet_urldec_query_part(k, qs, (size_t)(eq - qs));
magnet_urldec_query_part(v, eq+1, (size_t)(amp - (eq+1)));
}
else {
magnet_urldec_query_part(k, qs, (size_t)(amp - qs));
lua_pushnil(L);
}
lua_pushlstring(L, BUF_PTR_LEN(k));
lua_pushlstring(L, BUF_PTR_LEN(v));
lua_rawset(L, -3);
}
if (*amp == '\0') break;
}
chunk_buffer_release(k);
chunk_buffer_release(v);
return 1;
}
static void magnet_urlenc_query_part(buffer * const b, const char * const s, const size_t slen, const int iskey) {
/* encode query part (each part is typically much smaller than chunk buffer)
* all required chars plus '&' ';' '+' '\'' (and encode '=' if part of key)
* (burl_append(b,str,len,BURL_ENCODE_ALL) works, but over-encodes) */
#if 0
/* alternative: (over-encodes some, but less than burl_append()) */
UNUSED(iskey);
buffer_append_string_encoded(b, s, slen, ENCODING_REL_URI);
#else
static const char hex_chars_uc[] = "0123456789ABCDEF";
char * const p = buffer_string_prepare_append(b, slen*3);
int j = 0;
for (size_t i = 0; i < slen; ++i, ++j) {
int c = s[i];
if (!light_isalnum(c)) switch (c) {
case ' ':
c = '+';
break;
/*case '\'':*//*(ok in url query-part, but might be misused in HTML)*/
case '!': case '$': case '(': case ')': case '*': case ',': case '-':
case '.': case '/': case ':': case '?': case '@': case '_': case '~':
break;
case '=':
if (!iskey) break;
__attribute_fallthrough__
default:
p[j] = '%';
p[++j] = hex_chars_uc[(s[i] >> 4) & 0xF];
p[++j] = hex_chars_uc[s[i] & 0xF];
continue;
}
p[j] = c;
}
buffer_commit(b, j);
#endif
}
static int magnet_urlenc_query(lua_State *L) {
/* encode pairs in lua table into query string
* (caller should add leading '?' or '&' when appending to full URL)
* (caller should skip empty table if appending to existing query-string) */
const int n = lua_istable(L, 1) ? (int)lua_rawlen(L, 1) : 0;
if (n == 0) {
lua_pushlstring(L, "", 0);
return 1;
}
buffer * const b = chunk_buffer_acquire();
const_buffer s;
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
if (lua_isstring(L, -2)) {
if (!buffer_is_blank(b))
buffer_append_string_len(b, CONST_STR_LEN("&"));
s = magnet_checkconstbuffer(L, -2);
magnet_urlenc_query_part(b, s.ptr, s.len, 1);
if (!lua_isnil(L, -1)) {
s = magnet_checkconstbuffer(L, -1);
buffer_append_string_len(b, CONST_STR_LEN("="));
magnet_urlenc_query_part(b, s.ptr, s.len, 0);
}
}
}
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static int magnet_urlenc_normalize(lua_State *L) {
/* normalize url-encoding
* url-encode (and url-decode safe chars) to normalize url-path
* ('?' is treated as start of query-string and is not encoded;
* caller must encode '?' if intended to be part of url-path)
* ('/' is not encoded; caller must encode if not path separator)
* (burl_append() is not exposed here; caller might want to build
* url with lighty.c.urlenc() and lighty.c.urlenc_query(),
* then call lighty.c.urlenc_normalize()) */
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer * const t = chunk_buffer_acquire();
#if 0 /*(?maybe have different interface to use config policy?)*/
request_st * const r = magnet_get_request(L);
const int flags = r->conf.http_parseopts;
#else
const int flags = HTTP_PARSEOPT_URL_NORMALIZE
| HTTP_PARSEOPT_URL_NORMALIZE_UNRESERVED
| HTTP_PARSEOPT_URL_NORMALIZE_REQUIRED
| HTTP_PARSEOPT_URL_NORMALIZE_PATH_2F_DECODE
| HTTP_PARSEOPT_URL_NORMALIZE_PATH_DOTSEG_REMOVE
| HTTP_PARSEOPT_URL_NORMALIZE_QUERY_20_PLUS;
#endif
buffer_copy_string_len(b, s.ptr, s.len);
burl_normalize(b, t, flags);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(t);
chunk_buffer_release(b);
return 1;
}
static int magnet_fspath_simplify(lua_State *L) {
/* simplify filesystem path */
if (lua_isnil(L, -1)) {
lua_pushlstring(L, "", 0);
return 1;
}
const_buffer s = magnet_checkconstbuffer(L, -1);
if (0 == s.len) {
lua_pushvalue(L, -1);
return 1;
}
buffer * const b = chunk_buffer_acquire();
buffer_copy_string_len(b, s.ptr, s.len);
buffer_path_simplify(b);
lua_pushlstring(L, BUF_PTR_LEN(b));
chunk_buffer_release(b);
return 1;
}
static const char * magnet_cookie_param_push(lua_State *L, const char *s) {
const char *b = s;
while ( *s!=';' && *s!=' ' && *s!='\t' && *s!='\r' && *s!='\n' && *s)
++s;
lua_pushlstring(L, b, (size_t)(s-b));
return s;
}
static int magnet_cookie_tokens(lua_State *L) {
lua_createtable(L, 0, 0);
if (lua_isnil(L, -1))
return 1;
const char *s = luaL_checkstring(L, -1);
do {
while (*s==';' || *s==' ' || *s=='\t' || *s=='\r' || *s=='\n')
++s;
if (*s == '\0') break;
s = magnet_cookie_param_push(L, s);
while ( *s==' ' || *s=='\t' || *s=='\r' || *s=='\n')
++s;
if (*s == '=') {
while ( *s==' ' || *s=='\t' || *s=='\r' || *s=='\n')
++s;
if (*s==';' || *s=='\0')
lua_pushnil(L);
else
s = magnet_cookie_param_push(L, s);
}
else {
lua_pushnil(L);
}
lua_settable(L, -3);
while (*s!=';' && *s!='\0') ++s; /* ignore/skip stray tokens */
} while (*s++);
return 1;
}
static int magnet_atpanic(lua_State *L) {
request_st * const r = magnet_get_request(L);
log_error(r->conf.errh, __FILE__, __LINE__, "(lua-atpanic) %s",
lua_isstring(L, 1) ? lua_tostring(L, 1) : "");
longjmp(exceptionjmp, 1);
}
static int magnet_reqhdr_get(lua_State *L) {
/* __index: param 1 is the (empty) table the value was not found in */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
request_st * const r = magnet_get_request(L);
const int id = http_header_hkey_get(k, (uint32_t)klen);
const buffer * const vb = http_header_request_get(r, id, k, klen);
magnet_push_buffer(L, NULL != vb ? vb : NULL);
return 1;
}
static int magnet_reqhdr_set(lua_State *L) {
/* __newindex: param 1 is (empty) table in which value is to be set */
const_buffer k = magnet_checkconstbuffer(L, 2);
const_buffer v = magnet_checkconstbuffer(L, 3);
request_st * const r = magnet_get_request(L);
enum http_header_e id = http_header_hkey_get(k.ptr, (uint32_t)k.len);
switch (id) {
/*case HTTP_HEADER_OTHER:*/
default:
break;
case HTTP_HEADER_HOST:
/* do not allow Host to be unset, even if HTTP/1.0
* (change Host to something else, if you must */
if (0 == v.len) return 0;
/*(must set r->http_host if r->http_host was not previously set)*/
/* copied from request.c:http_request_header_set_Host() */
r->http_host = http_header_request_set_ptr(r, HTTP_HEADER_HOST,
CONST_STR_LEN("Host"));
buffer_copy_string_len_lc(r->http_host, v.ptr, v.len);
return 0;
case HTTP_HEADER_CONTENT_LENGTH:
/* not attempting to handle Content-Length modification; may revisit */
/* future: might permit setting to 0 to force discard of request body
* but would have to check if request body present, and if
* Content-Length was set, or if Transfer-Encoding: chunked,
* and handle resetting internal chunked encoding state,
* as well as making sure that this is handled properly for HTTP/2 */
return 0; /* silently ignore; do not allow modification */
/* do not permit modification of hop-by-hop (connection) headers */
case HTTP_HEADER_CONNECTION:
/* do not permit modification of Connection, incl add/remove tokens */
/* future: might provide a different interface to set r->keep_alive = 0,
* and also handle in context if HTTP/2 */
case HTTP_HEADER_TRANSFER_ENCODING:
case HTTP_HEADER_SET_COOKIE:/*(response hdr;avoid accidental reflection)*/
return 0; /* silently ignore; do not allow modification */
#if 0 /*(eh, if script sets Upgrade, script probably intends this action)*/
case HTTP_HEADER_UPGRADE:
/* note: modifications here do not modify Connection header
* to add or remove "upgrade" token */
/* future: might allow removal of existing tokens, but not addition */
if (0 != v.len) return 0; /* do not allow Upgrade other than to unset */
break;
#endif
#if 0 /*(eh, if script sets TE, script probably intends this action)*/
case HTTP_HEADER_TE:
if (0 != v.len) return 0; /* do not allow TE other than to unset */
break;
#endif
}
v.len
? http_header_request_set(r, id, k.ptr, k.len, v.ptr, v.len)
: http_header_request_unset(r, id, k.ptr, k.len);
return 0;
}
static int magnet_reqhdr_pairs(lua_State *L) {
request_st * const r = magnet_get_request(L);
return magnet_array_pairs(L, &r->rqst_headers);
}
static int magnet_resphdr_get(lua_State *L) {
/* __index: param 1 is the (empty) table the value was not found in */
/* Note: access to lighttpd r->resp_headers here is *independent* from
* the (pending) changes in the (deprecated) lua lighty.headers[] table */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
request_st * const r = magnet_get_request(L);
const int id = http_header_hkey_get(k, (uint32_t)klen);
const buffer * const vb = http_header_response_get(r, id, k, klen);
magnet_push_buffer(L, NULL != vb ? vb : NULL);
return 1;
}
static int magnet_resphdr_set_kv(lua_State *L, request_st * const r) {
const const_buffer k = magnet_checkconstbuffer(L, -2);
const const_buffer v = magnet_checkconstbuffer(L, -1);
const enum http_header_e id = http_header_hkey_get(k.ptr, (uint32_t)k.len);
switch (id) {
/*case HTTP_HEADER_OTHER:*/
default:
break;
case HTTP_HEADER_CONTENT_LENGTH:
/* lighttpd handles Content-Length or Transfer-Encoding for response */
return 0; /* silently ignore; do not allow modification */
/* do not permit modification of hop-by-hop (connection) headers */
case HTTP_HEADER_CONNECTION:
/* do not permit modification of Connection, incl add/remove tokens */
/* future: might provide a different interface to set r->keep_alive = 0,
* and also handle in context if HTTP/2 */
case HTTP_HEADER_TRANSFER_ENCODING:
return 0; /* silently ignore; do not allow modification */
}
if (0 == v.len) {
http_header_response_unset(r, id, k.ptr, k.len);
return 0;
}
buffer * const vb = http_header_response_set_ptr(r, id, k.ptr, k.len);
buffer_copy_string_len(vb, v.ptr, v.len);
if (r->http_version >= HTTP_VERSION_2) {
/* handle multi-line response headers with HTTP/2
* (lowercase header name and mark r->resp_header_repeated)
* (similar to http_header.c:http_header_response_insert_addtl()) */
for (char *n = vb->ptr; (n = strchr(n, '\n')); ) {
r->resp_header_repeated = 1;
do {
++n;
if (light_isupper(*n)) *n |= 0x20;
} while (*n != ':' && *n != '\n' && *n != '\0');
}
}
return 0;
}
static int magnet_resphdr_set(lua_State *L) {
/* __newindex: param 1 is (empty) table in which value is to be set */
/*const_buffer k = magnet_checkconstbuffer(L, 2);*/
/*const_buffer v = magnet_checkconstbuffer(L, 3);*/
request_st * const r = magnet_get_request(L);
return magnet_resphdr_set_kv(L, r);
}
static int magnet_resphdr_pairs(lua_State *L) {
request_st * const r = magnet_get_request(L);
return magnet_array_pairs(L, &r->resp_headers);
}
static int magnet_status_get(lua_State *L) {
/* __index: param 1 is the (empty) table the value was not found in */
const_buffer key = magnet_checkconstbuffer(L, 2);
int *i = status_counter_get_counter(key.ptr, key.len);
lua_pushinteger(L, (lua_Integer)*i);
return 1;
}
static int magnet_status_set(lua_State *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(key.ptr, key.len, counter);
return 0;
}
static int magnet_status_pairs(lua_State *L) {
return magnet_array_pairs(L, &plugin_stats);
}
typedef struct {
const char *name;
uint32_t nlen;
enum {
MAGNET_ENV_UNSET,
MAGNET_ENV_PHYSICAL_PATH,
MAGNET_ENV_PHYSICAL_REL_PATH,
MAGNET_ENV_PHYSICAL_DOC_ROOT,
MAGNET_ENV_PHYSICAL_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_SERVER_ADDR,
MAGNET_ENV_REQUEST_PROTOCOL,
MAGNET_ENV_RESPONSE_HTTP_STATUS,
MAGNET_ENV_RESPONSE_BODY_LENGTH,
MAGNET_ENV_RESPONSE_BODY
} type;
} magnet_env_t;
static const magnet_env_t magnet_env[] = {
{ CONST_STR_LEN("physical.path"), MAGNET_ENV_PHYSICAL_PATH },
{ CONST_STR_LEN("physical.rel-path"), MAGNET_ENV_PHYSICAL_REL_PATH },
{ CONST_STR_LEN("physical.doc-root"), MAGNET_ENV_PHYSICAL_DOC_ROOT },
{ CONST_STR_LEN("physical.basedir"), MAGNET_ENV_PHYSICAL_BASEDIR },
{ CONST_STR_LEN("uri.path"), MAGNET_ENV_URI_PATH },
{ CONST_STR_LEN("uri.path-raw"), MAGNET_ENV_URI_PATH_RAW },
{ CONST_STR_LEN("uri.scheme"), MAGNET_ENV_URI_SCHEME },
{ CONST_STR_LEN("uri.authority"), MAGNET_ENV_URI_AUTHORITY },
{ CONST_STR_LEN("uri.query"), MAGNET_ENV_URI_QUERY },
{ CONST_STR_LEN("request.method"), MAGNET_ENV_REQUEST_METHOD },
{ CONST_STR_LEN("request.uri"), MAGNET_ENV_REQUEST_URI },
{ CONST_STR_LEN("request.orig-uri"), MAGNET_ENV_REQUEST_ORIG_URI },
{ CONST_STR_LEN("request.path-info"), MAGNET_ENV_REQUEST_PATH_INFO },
{ CONST_STR_LEN("request.remote-ip"), MAGNET_ENV_REQUEST_REMOTE_IP },
{ CONST_STR_LEN("request.remote-addr"), MAGNET_ENV_REQUEST_REMOTE_IP },
{ CONST_STR_LEN("request.server-addr"), MAGNET_ENV_REQUEST_SERVER_ADDR },
{ CONST_STR_LEN("request.protocol"), MAGNET_ENV_REQUEST_PROTOCOL },
{ CONST_STR_LEN("response.http-status"), MAGNET_ENV_RESPONSE_HTTP_STATUS },
{ CONST_STR_LEN("response.body-length"), MAGNET_ENV_RESPONSE_BODY_LENGTH },
{ CONST_STR_LEN("response.body"), MAGNET_ENV_RESPONSE_BODY },
{ NULL, 0, MAGNET_ENV_UNSET }
};
static buffer *magnet_env_get_buffer_by_id(request_st * const r, int id) {
buffer *dest = NULL;
/**
* map all internal variables to lua
*
*/
switch (id) {
case MAGNET_ENV_PHYSICAL_PATH: dest = &r->physical.path; break;
case MAGNET_ENV_PHYSICAL_REL_PATH: dest = &r->physical.rel_path; break;
case MAGNET_ENV_PHYSICAL_DOC_ROOT: dest = &r->physical.doc_root; break;
case MAGNET_ENV_PHYSICAL_BASEDIR: dest = &r->physical.basedir; break;
case MAGNET_ENV_URI_PATH: dest = &r->uri.path; break;
case MAGNET_ENV_URI_PATH_RAW:
{
dest = r->tmp_buf;
buffer_clear(dest);
uint32_t len = buffer_clen(&r->target);
char *qmark = memchr(r->target.ptr, '?', len);
buffer_copy_string_len(dest, r->target.ptr, qmark ? (uint32_t)(qmark - r->target.ptr) : len);
break;
}
case MAGNET_ENV_URI_SCHEME: dest = &r->uri.scheme; break;
case MAGNET_ENV_URI_AUTHORITY: dest = &r->uri.authority; break;
case MAGNET_ENV_URI_QUERY: dest = &r->uri.query; break;
case MAGNET_ENV_REQUEST_METHOD:
dest = r->tmp_buf;
buffer_clear(dest);
http_method_append(dest, r->http_method);
break;
case MAGNET_ENV_REQUEST_URI: dest = &r->target; break;
case MAGNET_ENV_REQUEST_ORIG_URI: dest = &r->target_orig; break;
case MAGNET_ENV_REQUEST_PATH_INFO: dest = &r->pathinfo; break;
case MAGNET_ENV_REQUEST_REMOTE_IP: dest = &r->con->dst_addr_buf; break;
case MAGNET_ENV_REQUEST_SERVER_ADDR: /* local IP without port */
{
const server_socket * const srv_socket = r->con->srv_socket;
dest = r->tmp_buf;
buffer_clear(dest);
switch (sock_addr_get_family(&srv_socket->addr)) {
case AF_INET:
case AF_INET6:
if (sock_addr_is_addr_wildcard(&srv_socket->addr)) {
sock_addr addrbuf;
socklen_t addrlen = sizeof(addrbuf);
const int fd = r->con->fd;
if (0 == getsockname(fd,(struct sockaddr *)&addrbuf,&addrlen)) {
char buf[INET6_ADDRSTRLEN + 1];
const char *s = sock_addr_inet_ntop(&addrbuf, buf, sizeof(buf));
if (NULL != s)
buffer_copy_string_len(dest, s, strlen(s));
}
}
else
buffer_copy_string_len(dest, srv_socket->srv_token->ptr,
srv_socket->srv_token_colon);
break;
default:
break;
}
break;
}
case MAGNET_ENV_REQUEST_PROTOCOL:
dest = r->tmp_buf;
buffer_clear(dest);
http_version_append(dest, r->http_version);
break;
case MAGNET_ENV_RESPONSE_HTTP_STATUS:
dest = r->tmp_buf;
buffer_clear(dest);
buffer_append_int(dest, r->http_status);
break;
case MAGNET_ENV_RESPONSE_BODY_LENGTH:
dest = r->tmp_buf;
buffer_clear(dest);
if (!r->resp_body_finished)
break;
buffer_append_int(dest, chunkqueue_length(&r->write_queue));
break;
case MAGNET_ENV_RESPONSE_BODY:
if (!r->resp_body_finished)
break;
else {
chunkqueue * const cq = &r->write_queue;
off_t len = chunkqueue_length(cq);
if (0 == len) {
dest = r->tmp_buf;
buffer_copy_string_len(dest, CONST_STR_LEN(""));
break;
}
dest = chunkqueue_read_squash(cq, r->conf.errh);
if (NULL == dest) {
dest = r->tmp_buf;
buffer_clear(dest);
}
}
break;
case MAGNET_ENV_UNSET: break;
}
return dest;
}
static int magnet_env_get_id(const char * const key, const size_t klen) {
for (int i = 0; magnet_env[i].name; ++i) {
if (klen == magnet_env[i].nlen
&& 0 == memcmp(key, magnet_env[i].name, klen))
return magnet_env[i].type;
}
return MAGNET_ENV_UNSET;
}
static buffer *magnet_env_get_buffer(request_st * const r, const char * const k, const size_t klen) {
return magnet_env_get_buffer_by_id(r, magnet_env_get_id(k, klen));
}
static int magnet_env_get(lua_State *L) {
/* __index: param 1 is the (empty) table the value was not found in */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
request_st * const r = magnet_get_request(L);
magnet_push_buffer(L, magnet_env_get_buffer(r, k, klen));
return 1;
}
static int magnet_env_set(lua_State *L) {
/* __newindex: param 1 is the (empty) table the value is supposed to be set in */
size_t klen;
const char * const key = luaL_checklstring(L, 2, &klen);
luaL_checkany(L, 3); /* nil or a string */
request_st * const r = magnet_get_request(L);
const int env_id = magnet_env_get_id(key, klen);
switch (env_id) {
default:
break;
case MAGNET_ENV_URI_PATH_RAW:
{
/* modify uri-path of r->target; preserve query-part, if present */
/* XXX: should we require that resulting path begin with '/' or %2F ? */
const uint32_t len = buffer_clen(&r->target);
const char * const qmark = memchr(r->target.ptr, '?', len);
const_buffer val = { NULL, 0 };
if (!lua_isnil(L, 3))
val = magnet_checkconstbuffer(L, 3);
if (NULL != qmark)
buffer_copy_string_len(r->tmp_buf, qmark,
len - (uint32_t)(qmark - r->target.ptr));
buffer_copy_string_len(&r->target, val.ptr, val.len);
if (NULL != qmark)
buffer_append_string_buffer(&r->target, r->tmp_buf);
return 0;
}
case MAGNET_ENV_RESPONSE_HTTP_STATUS:
case MAGNET_ENV_RESPONSE_BODY_LENGTH:
case MAGNET_ENV_RESPONSE_BODY:
return luaL_error(L, "lighty.env['%s'] is read-only", key);
}
buffer * const dest = magnet_env_get_buffer_by_id(r, env_id);
if (NULL == dest)
return luaL_error(L, "couldn't store '%s' in lighty.env[]", key);
if (lua_isnil(L, 3)) {
if (env_id==MAGNET_ENV_URI_QUERY || env_id==MAGNET_ENV_PHYSICAL_PATH)
buffer_clear(dest);
else
buffer_blank(dest);
}
else {
const_buffer val = magnet_checkconstbuffer(L, 3);
buffer_copy_string_len(dest, val.ptr, val.len);
/* NB: setting r->uri.query does not modify query-part in r->target
* (r->uri.query is uri-decoded; r->target is not) */
}
switch (env_id) {
case MAGNET_ENV_URI_SCHEME:
case MAGNET_ENV_URI_AUTHORITY:
buffer_to_lower(dest);
if (env_id == MAGNET_ENV_URI_AUTHORITY)
r->server_name = dest;
break;
default:
break;
}
return 0;
}
static int magnet_env_next(lua_State *L) {
const int pos = lua_tointeger(L, lua_upvalueindex(1));
/* 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_pushlstring(L, magnet_env[pos].name, magnet_env[pos].nlen);
/* get value */
request_st * const r = magnet_get_request(L);
magnet_push_buffer(L, magnet_env_get_buffer_by_id(r, magnet_env[pos].type));
/* 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) {
/* __index: param 1 is the (empty) table the value was not found in */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
request_st * const r = magnet_get_request(L);
const buffer * const vb = http_header_env_get(r, k, klen);
magnet_push_buffer(L, NULL != vb ? vb : NULL);
return 1;
}
static int magnet_cgi_set(lua_State *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, 3);
request_st * const r = magnet_get_request(L);
http_header_env_set(r, key.ptr, key.len, val.ptr, val.len);
return 0;
}
static int magnet_cgi_pairs(lua_State *L) {
request_st * const r = magnet_get_request(L);
return magnet_array_pairs(L, &r->env);
}
static int magnet_respbody_add(lua_State *L) {
request_st * const r = magnet_get_request(L);
if (lua_isstring(L, -1)) {
const_buffer data = magnet_checkconstbuffer(L, -1);
http_chunk_append_mem(r, data.ptr, data.len);
return 1; /* boolean true */
}
else if (!lua_istable(L, -1))
return 0; /* boolean false */
/* note: differs from magnet_attach_content();
* magnet_attach_content() has misnamed 'length' param which
* is treated as 0-offset pos one after end of range to send.
* Here, 'length' means 'length', as one would expect */
for (int i=1, end=0, n=(int)lua_rawlen(L,-1); !end && i <= n; ++i) {
lua_rawgeti(L, -1, i);
if (lua_isstring(L, -1)) {
const_buffer data = magnet_checkconstbuffer(L, -1);
http_chunk_append_mem(r, data.ptr, data.len);
}
else if (lua_istable(L, -1)) {
lua_getfield(L, -1, "filename");
lua_getfield(L, -2, "length");
lua_getfield(L, -3, "offset");
if (lua_isstring(L, -3)) { /* filename has to be a string */
off_t off = (off_t) luaL_optinteger(L, -1, 0);
off_t len = (off_t) luaL_optinteger(L, -2, -1);
/*(-1 len as flag to use file size minus offset (below))*/
buffer stor; /*(note: do not free magnet_checkbuffer() result)*/
const buffer * const fn = magnet_checkbuffer(L, -3, &stor);
stat_cache_entry * const sce = (!buffer_is_blank(fn))
? stat_cache_get_entry_open(fn, r->conf.follow_symlink)
: NULL;
if (sce && (sce->fd >= 0 || sce->st.st_size == 0)) {
/* treat negative offset as bytes from end of file */
/* treat negative len as bytes from offset to end of file */
if (off > sce->st.st_size)
off = sce->st.st_size;
else if (off < 0) {
off = sce->st.st_size - off;
if (off < 0) off = 0;
}
if (len < 0 || sce->st.st_size - off < len)
len = sce->st.st_size - off;
if (len)
http_chunk_append_file_ref_range(r, sce, off, len);
}
else {
log_error(r->conf.errh, __FILE__, __LINE__,
"error opening file '%s'", fn->ptr);
end = 1;
}
}
else {
log_error(r->conf.errh, __FILE__, __LINE__,
"body[%d] table field \"filename\" must be a string", i);
end = 1;
}
lua_pop(L, 3);
}
else if (lua_isnil(L, -1)) { /* end of list */
end = 1;
}
else {
log_error(r->conf.errh, __FILE__, __LINE__,
"body[%d] is neither a string nor a table", i);
end = 1;
}
lua_pop(L, 1); /* pop the content[...] entry value */
}
return 1; /* boolean true */
}
static int magnet_respbody(lua_State *L) {
/* __index: param 1 is the (empty) table the value was not found in */
size_t klen;
const char * const k = luaL_checklstring(L, 2, &klen);
switch (k[0]) {
case 'a': /* add; lighty.r.resp_body.add */
if (k[1] == 'd' && k[2] == 'd' && k[3] == '\0') {
lua_pushcclosure(L, magnet_respbody_add, 0);
return 1;
}
break;
#if 0 /*(future: provide pairs() interface to iterate over chunkqueue)*/
/*(might convert chunks into table of strings, {filename="..."})*/
/*(what about c->offset into chunk?)*/
case 'g': /* get; lighty.r.resp_body.get */
if (k[1] == 'e' && k[2] == 't' && k[3] == '\0') {
/* equivalent to lighty.r.attr["response.body"] */
/* equivalent to lighty.env["response.body"] */
if (r->resp_body_finished) {
chunkqueue * const cq = &r->write_queue;
chunkqueue_length(cq)
? magnet_push_buffer(L,
chunkqueue_read_squash(cq,r->conf.errh))
: lua_pushlstring(L, "", 0);
}
else
lua_pushnil(L); /*(?maybe return -1 instead if len unknown?)*/
return 1;
}
break;
#endif
case 'l': /* len; lighty.r.resp_body.len */
if (k[1] == 'e' && k[2] == 'n' && k[3] == '\0') {
/* equivalent to lighty.r.req_attr["response.body-length"] */
/* equivalent to lighty.env["response.body-length"] */
request_st * const r = magnet_get_request(L);
if (r->resp_body_finished)
lua_pushinteger(L, chunkqueue_length(&r->write_queue));
else
lua_pushnil(L); /*(?maybe return -1 instead if len unknown?)*/
return 1;
}
break;
case 's': /* set; lighty.r.resp_body.set */
if (k[1] == 'e' && k[2] == 't' && k[3] == '\0') {
request_st * const r = magnet_get_request(L);
http_response_body_clear(r, 0); /* clear respbody, then add */
lua_pushcclosure(L, magnet_respbody_add, 0);
return 1;
}
break;
default:
break;
}
lua_pushliteral(L, "lighty.r.resp_body invalid method or param");
lua_error(L);
return 0;
}
static int magnet_lighty_result_get(lua_State *L) {
/* __index: param 1 is the lighty table the value was not found in */
lua_getfield(L, 1, "result"); /* lighty.result */
lua_pushvalue(L, 2);
lua_rawget(L, -2);
if (lua_isnil(L, -1)) {
const_buffer k = magnet_checkconstbuffer(L, 2);
if (k.len == 7 && 0 == memcmp(k.ptr, "content", 7)) {
lua_pop(L, 1); /* pop nil */
lua_createtable(L, 0, 0); /* create "content" table on demand */
lua_pushvalue(L, -1);
lua_rawset(L, 3); /* set in "lighty.result" */
}
}
lua_replace(L, 3);
return 1;
}
static int magnet_lighty_result_set(lua_State *L) {
/* __newindex: param 1 is lighty table the value is supposed to be set in */
/* assign value to table, replacing existing value, if any
* (expecting "content" here, but compatible with prior misuse potential)
* (special-case "header" back into lighty.header) */
const_buffer k = magnet_checkconstbuffer(L, 2);
if (k.len != 6 || 0 != memcmp(k.ptr, "header", 6)) {
lua_getfield(L, 1, "result"); /* lighty.result */
lua_replace(L, 1); /* replace param 1, original target table */
}
lua_rawset(L, -3);
return 0;
}
static void magnet_copy_response_header(lua_State * const L, request_st * const r) {
lua_getfield(L, -1, "header"); /* lighty.header */
if (lua_istable(L, -1)) {
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
if (lua_isstring(L, -1) && lua_isstring(L, -2))
magnet_resphdr_set_kv(L, r);
}
}
lua_pop(L, 1); /* pop lighty.header */
}
/**
* walk through the content array set by lua script, e.g.
* lighy.header["Content-Type"] = "text/html"
* lighty.content =
* { "<html><body><pre>", { file = "/content" } , "</pre></body></html>" }
* return 200
*/
static int magnet_attach_content(lua_State * const L, request_st * const r) {
lua_getfield(L, -1, "result"); /* lighty.result */
lua_getfield(L, -1, "content"); /* lighty.result.content */
if (lua_istable(L, -1)) {
/* content is found, and is a table */
http_response_body_clear(r, 0);
for (int i=1, end=0, n=(int)lua_rawlen(L,-1); !end && i <= n; ++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);
http_chunk_append_mem(r, 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 */
off_t off = (off_t) luaL_optinteger(L, -1, 0);
off_t len = (off_t) luaL_optinteger(L, -2, -1); /*(-1 as flag to use file size minus offset (below))*/
if (off < 0) {
log_error(r->conf.errh, __FILE__, __LINE__,
"offset for '%s' is negative", lua_tostring(L, -3));
end = 1;
} else if (len >= off) {
len -= off;
} else if (-1 != len) {
log_error(r->conf.errh, __FILE__, __LINE__,
"offset > length for '%s'", lua_tostring(L, -3));
end = 1;
}
if (!end && 0 != len) {
buffer stor; /*(note: do not free magnet_checkbuffer() result)*/
const buffer * const fn = magnet_checkbuffer(L, -3, &stor);
stat_cache_entry * const sce = (!buffer_is_blank(fn))
? stat_cache_get_entry_open(fn, r->conf.follow_symlink)
: NULL;
if (sce && (sce->fd >= 0 || sce->st.st_size == 0)) {
if (len == -1 || sce->st.st_size - off < len)
len = sce->st.st_size - off;
if (len > 0)
http_chunk_append_file_ref_range(r, sce, off, len);
} else {
log_error(r->conf.errh, __FILE__, __LINE__,
"error opening file content '%s' at offset %lld",
lua_tostring(L, -3), (long long)off);
end = 1;
}
}
} else {
log_error(r->conf.errh, __FILE__, __LINE__,
"content[%d] is a table and field \"filename\" must be a string", i);
end = 1;
}
lua_pop(L, 3);
} else if (lua_isnil(L, -1)) {
/* end of list */
end = 1;
} else {
log_error(r->conf.errh, __FILE__, __LINE__,
"content[%d] is neither a string nor a table", i);
end = 1;
}
lua_pop(L, 1); /* pop the content[...] entry value */
}
} else if (!lua_isnil(L, -1)) {
log_error(r->conf.errh, __FILE__, __LINE__,
"lighty.content has to be a table");
}
lua_pop(L, 2); /* pop lighty.result.content and lighty.result */
return 0;
}
static void magnet_mainenv_metatable(lua_State * const L) {
if (luaL_newmetatable(L, "lighty.mainenv")) { /* (sp += 1) */
lua_pushglobaltable(L); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* { __index = _G } (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
}
}
__attribute_cold__
static void magnet_init_lighty_table(lua_State * const L) {
/* init lighty table and other initial setup for global lua_State */
lua_atpanic(L, magnet_atpanic);
lua_pushglobaltable(L); /* (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) */
#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_pop(L, 1); /* pop global table */ /* (sp -= 1) */
magnet_mainenv_metatable(L); /* init table for mem locality (sp += 1) */
magnet_stat_metatable(L); /* init table for mem locality (sp += 1) */
lua_pop(L, 2); /* pop mainenv,stat metatables (sp -= 2) */
/* lighty table
*
* lighty.r.req_header[] HTTP request headers
* lighty.r.req_attr[] HTTP request attributes / components
* lighty.r.req_env[] HTTP request environment variables
* lighty.r.resp_header[] HTTP response headers
* lighty.r.resp_body.* HTTP response body accessors
* lighty.r.resp_body.len HTTP response body length
* lighty.r.resp_body.add() HTTP response body add (string or table)
* lighty.r.resp_body.set() HTTP response body set (string or table)
*
* (older interface)
*
* lighty.request[] HTTP request headers
* lighty.req_env[] CGI environment variables
* lighty.env[] lighttpd request metadata,
* various url components,
* physical file paths;
* might contain nil values
*
* lighty.header[] (script) HTTP response headers
* lighty.content[] (script) HTTP response body (table of string/file)
*
* lighty.status[] lighttpd status counters
*/
/*(adjust the preallocation if more entries are added)*/
lua_createtable(L, 0, 9); /* lighty.* (returned on stack) (sp += 1) */
lua_createtable(L, 0, 5); /* lighty.r (sp += 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 4); /* metatable for req_header table (sp += 1) */
lua_pushcfunction(L, magnet_reqhdr_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_reqhdr_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_reqhdr_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to req_header (sp -= 1) */
lua_setfield(L, -2, "req_header"); /* req_header = {} (sp -= 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 4); /* metatable for req_attr 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_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to req_attr (sp -= 1) */
lua_setfield(L, -2, "req_attr"); /* req_attr = {} (sp -= 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 4); /* metatable for 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_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to req_env (sp -= 1) */
lua_setfield(L, -2, "req_env"); /* req_env = {} (sp -= 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 4); /* metatable for resp_header table (sp += 1) */
lua_pushcfunction(L, magnet_resphdr_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_resphdr_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_resphdr_pairs); /* (sp += 1) */
lua_setfield(L, -2, "__pairs"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to resp_header (sp -= 1) */
lua_setfield(L, -2, "resp_header"); /* resp_header = {} (sp -= 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 3); /* metatable for resp_body table (sp += 1) */
lua_pushcfunction(L, magnet_respbody); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_newindex_readonly); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to resp_body (sp -= 1) */
lua_setfield(L, -2, "resp_body"); /* resp_body = {} (sp -= 1) */
lua_createtable(L, 0, 2); /* metatable for r table (sp += 1) */
lua_pushcfunction(L, magnet_newindex_readonly); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to r (sp -= 1) */
lua_setfield(L, -2, "r"); /* lighty.r = {} (sp -= 1) */
/* compatibility with previous mod_magnet interfaces in top of lighty.* */
lua_getfield(L, -1, "r"); /* (sp += 1) */
/* alias lighty.request -> lighty.r.req_header */
lua_getfield(L, -1, "req_header"); /* (sp += 1) */
lua_setfield(L, -3, "request"); /* request = {} (sp -= 1) */
/* alias lighty.env -> lighty.r.req_attr */
lua_getfield(L, -1, "req_attr"); /* (sp += 1) */
lua_setfield(L, -3, "env"); /* env = {} (sp -= 1) */
/* alias lighty.req_env -> lighty.r.req_env */
lua_getfield(L, -1, "req_env"); /* (sp += 1) */
lua_setfield(L, -3, "req_env"); /* req_env = {} (sp -= 1) */
lua_pop(L, 1); /* (sp -= 1) */
lua_createtable(L, 0, 0); /* {} (sp += 1) */
lua_createtable(L, 0, 4); /* metatable for 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_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to status (sp -= 1) */
lua_setfield(L, -2, "status"); /* status = {} (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) */
/* add empty 'header' and 'result' tables; ('content' is under 'result') */
/* (prefer newer lighty.r.resp_header(), lighty.r.resp_body() interfaces) */
lua_createtable(L, 0, 8); /* {} (sp += 1) */
lua_setfield(L, -2, "header"); /* header = {} (sp -= 1) */
lua_createtable(L, 0, 1); /* {} (sp += 1) */
lua_setfield(L, -2, "result"); /* result = {} (sp -= 1) */
static const luaL_Reg cmethods[] = {
{ "stat", magnet_stat }
,{ "time", magnet_time }
,{ "rand", magnet_rand }
,{ "md", magnet_md_once } /* message digest */
,{ "hmac", magnet_hmac_once } /* HMAC */
,{ "digest_eq", magnet_digest_eq } /* timing-safe eq fixed len */
,{ "secret_eq", magnet_secret_eq } /* timing-safe eq variable len */
,{ "b64urldec", magnet_b64urldec } /* validate and decode base64url */
,{ "b64urlenc", magnet_b64urlenc } /* base64url encode, no padding */
,{ "b64dec", magnet_b64stddec } /* validate and decode base64 */
,{ "b64enc", magnet_b64stdenc } /* base64 encode, no padding */
,{ "hexdec", magnet_hexdec } /* validate and decode hex str */
,{ "hexenc", magnet_hexenc } /* uc; lc w/ lua s = s:lower() */
,{ "xmlenc", magnet_xmlenc } /* xml-encode/html-encode: <>&'\" */
,{ "urldec", magnet_urldec } /* url-decode (path) */
,{ "urlenc", magnet_urlenc } /* url-encode (path) */
,{ "urldec_query", magnet_urldec_query } /* url-decode query-string */
,{ "urlenc_query", magnet_urlenc_query } /* url-encode query-string */
,{ "urlenc_normalize", magnet_urlenc_normalize }/* url-enc normalization */
,{ "fspath_simplify", magnet_fspath_simplify } /* simplify fspath */
,{ "cookie_tokens", magnet_cookie_tokens } /* parse cookie tokens */
,{ NULL, NULL }
};
lua_createtable(L, 0, sizeof(cmethods)/sizeof(luaL_Reg)-1);/*(sp += 1) */
luaL_setfuncs(L, cmethods, 0);
lua_createtable(L, 0, 2); /* metatable for c table (sp += 1) */
lua_pushcfunction(L, magnet_newindex_readonly); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to c (sp -= 1) */
lua_setfield(L, -2, "c"); /* c = {} (sp -= 1) */
lua_createtable(L, 0, 3); /* metatable for lighty table (sp += 1) */
lua_pushcfunction(L, magnet_lighty_result_get); /* (sp += 1) */
lua_setfield(L, -2, "__index"); /* (sp -= 1) */
lua_pushcfunction(L, magnet_lighty_result_set); /* (sp += 1) */
lua_setfield(L, -2, "__newindex"); /* (sp -= 1) */
lua_pushboolean(L, 0); /* (sp += 1) */
lua_setfield(L, -2, "__metatable"); /* protect metatable (sp -= 1) */
lua_setmetatable(L, -2); /* tie the metatable to lighty (sp -= 1) */
/* lighty table (returned on stack) */
}
static void magnet_clear_table(lua_State * const L) {
for (int n = (int)lua_rawlen(L, -1); n; --n) {
lua_pushnil(L);
lua_rawseti(L, -2, n);
}
}
static void magnet_reset_lighty_table(lua_State * const L) {
/* clear response tables (release mem if reusing lighty table) */
lua_getfield(L, -1, "result"); /* lighty.result */
if (lua_istable(L, -1))
magnet_clear_table(L);
else {
lua_createtable(L, 0, 1);
lua_setfield(L, -3, "result");
}
lua_pop(L, 1);
lua_getfield(L, -1, "header"); /* lighty.header */
if (lua_istable(L, -1))
magnet_clear_table(L);
else {
lua_createtable(L, 0, 0);
lua_setfield(L, -3, "header");
}
lua_pop(L, 1);
}
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(request_st * const r, plugin_data * const p, script * const sc) {
/*(always check at least mtime and size to trigger script reload)*/
int etag_flags = r->conf.etag_flags | ETAG_USE_MTIME | ETAG_USE_SIZE;
lua_State * const L = script_cache_check_script(sc, etag_flags);
int lua_return_value;
const int func_ndx = 1;
const int lighty_table_ndx = 2;
if (NULL == L) {
log_perror(r->conf.errh, __FILE__, __LINE__,
"loading script %s failed", sc->name.ptr);
if (p->conf.stage != -1) { /* skip for response-start */
r->http_status = 500;
r->handler_module = NULL;
}
return HANDLER_FINISHED;
}
if (lua_isstring(L, -1)) {
log_error(r->conf.errh, __FILE__, __LINE__,
"loading script %s failed: %s", sc->name.ptr, lua_tostring(L, -1));
lua_pop(L, 1);
force_assert(lua_gettop(L) == 0); /* only the error should have been on the stack */
if (p->conf.stage != -1) { /* skip for response-start */
r->http_status = 500;
r->handler_module = NULL;
}
return HANDLER_FINISHED;
}
lua_pushlightuserdata(L, r);
lua_setfield(L, LUA_REGISTRYINDEX, LUA_RIDX_LIGHTTPD_REQUEST);
if (lua_gettop(L) == 2) {
/*force_assert(lua_istable(L, -1));*//* lighty.* table */
}
else {
/*force_assert(lua_gettop(L) == 1);*/
/* insert lighty table at index 2 (lighty_table_ndx = 2) */
magnet_init_lighty_table(L); /* lighty.* (sp += 1) */
}
/**
* 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_createtable(L, 0, 1); /* my empty environment aka {} (sp += 1) */
lua_pushvalue(L, lighty_table_ndx); /* (sp += 1) */
lua_setfield(L, -2, "lighty"); /* lighty.* (sp -= 1) */
magnet_mainenv_metatable(L); /* (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(r->conf.errh, __FILE__, __LINE__,
"lua_pcall(): %s", lua_tostring(L, -1));
lua_pop(L, 1); /* pop error msg */
/* only the function and lighty table should remain on the stack */
force_assert(lua_gettop(L) == 2);
magnet_reset_lighty_table(L);
if (p->conf.stage != -1) { /* skip for response-start */
r->http_status = 500;
r->handler_module = NULL;
}
return HANDLER_FINISHED;
}
}
/* we should have the function, the lighty table and the return value on the stack */
/*force_assert(lua_gettop(L) == 3);*/
switch (lua_type(L, -1)) {
case LUA_TNUMBER:
case LUA_TNIL:
lua_return_value = (int) luaL_optinteger(L, -1, -1);
break;
default:
log_error(r->conf.errh, __FILE__, __LINE__,
"lua_pcall(): unexpected return type: %s", luaL_typename(L, -1));
lua_return_value = -1;
break;
}
lua_pop(L, 1); /* pop return value */
/*force_assert(lua_istable(sc->L, -1));*/
magnet_copy_response_header(L, r);
{
handler_t result = HANDLER_GO_ON;
if (lua_return_value >= 200) {
r->http_status = lua_return_value;
r->resp_body_finished = 1;
if (0 == setjmp(exceptionjmp)) {
magnet_attach_content(L, r);
if (!chunkqueue_is_empty(&r->write_queue)) {
r->handler_module = p->self;
}
} else {
lua_settop(L, 2); /* remove all but function and lighty table */
r->http_status = 500;
r->handler_module = NULL;
http_response_body_clear(r, 0);
}
result = HANDLER_FINISHED;
} else if (lua_return_value >= 100) {
/*(custom lua code should not return 101 Switching Protocols)*/
r->http_status = lua_return_value;
result = http_response_send_1xx(r)
? HANDLER_GO_ON
: HANDLER_ERROR;
} else if (MAGNET_RESTART_REQUEST == lua_return_value) {
result = HANDLER_COMEBACK;
}
magnet_reset_lighty_table(L);
return result;
}
}
static handler_t magnet_attract_array(request_st * const r, plugin_data * const p, int stage) {
mod_magnet_patch_config(r, p);
p->conf.stage = stage;
script * const *scripts;
switch (stage) {
case 1: scripts = p->conf.url_raw; break;
case 0: scripts = p->conf.physical_path; break;
case -1: scripts = p->conf.response_start; break;
default: scripts = NULL; break;
}
if (NULL == scripts) return HANDLER_GO_ON; /* no scripts set */
r->con->srv->request_env(r);
/* execute scripts sequentially while HANDLER_GO_ON */
handler_t rc = HANDLER_GO_ON;
do {
rc = magnet_attract(r, p, *scripts);
} while (rc == HANDLER_GO_ON && *++scripts);
if (r->error_handler_saved_status) {
/* retrieve (possibly modified) REDIRECT_STATUS and store as number */
int x;
const buffer * const vb = http_header_env_get(r, CONST_STR_LEN("REDIRECT_STATUS"));
if (vb && (x = http_header_str_to_code(vb->ptr)) != -1)
r->error_handler_saved_status =
r->error_handler_saved_status > 0 ? (int)x : -(int)x;
}
return rc;
}
URIHANDLER_FUNC(mod_magnet_uri_handler) {
return magnet_attract_array(r, p_d, 1);
}
URIHANDLER_FUNC(mod_magnet_physical) {
return magnet_attract_array(r, p_d, 0);
}
URIHANDLER_FUNC(mod_magnet_response_start) {
return magnet_attract_array(r, p_d, -1);
}
int mod_magnet_plugin_init(plugin *p);
int mod_magnet_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "magnet";
p->init = mod_magnet_init;
p->handle_uri_clean = mod_magnet_uri_handler;
p->handle_physical = mod_magnet_physical;
p->handle_response_start = mod_magnet_response_start;
p->set_defaults = mod_magnet_set_defaults;
p->cleanup = mod_magnet_free;
return 0;
}