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542 lines
11 KiB
C
542 lines
11 KiB
C
/*
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* uhttpd - Tiny single-threaded httpd - Lua handler
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*
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* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "uhttpd.h"
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#include "uhttpd-utils.h"
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#include "uhttpd-lua.h"
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static int uh_lua_recv(lua_State *L)
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{
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size_t length;
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char buffer[UH_LIMIT_MSGHEAD];
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ssize_t rlen = 0;
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fd_set reader;
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struct timeval timeout;
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length = luaL_checknumber(L, 1);
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if( (length > 0) && (length <= sizeof(buffer)) )
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{
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FD_ZERO(&reader);
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FD_SET(fileno(stdin), &reader);
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/* fail after 0.1s */
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timeout.tv_sec = 0;
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timeout.tv_usec = 100000;
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/* check whether fd is readable */
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if( select(fileno(stdin) + 1, &reader, NULL, NULL, &timeout) > 0 )
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{
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/* receive data */
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rlen = read(fileno(stdin), buffer, length);
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lua_pushnumber(L, rlen);
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if( rlen > 0 )
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{
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lua_pushlstring(L, buffer, rlen);
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return 2;
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}
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return 1;
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}
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/* no, timeout and actually no data */
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lua_pushnumber(L, -2);
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return 1;
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}
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/* parameter error */
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lua_pushnumber(L, -3);
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return 1;
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}
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static int uh_lua_send_common(lua_State *L, int chunked)
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{
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size_t length;
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const char *buffer;
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char chunk[16];
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ssize_t slen = 0;
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buffer = luaL_checklstring(L, 1, &length);
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if( chunked )
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{
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if( length > 0 )
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{
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snprintf(chunk, sizeof(chunk), "%X\r\n", length);
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slen = write(fileno(stdout), chunk, strlen(chunk));
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slen += write(fileno(stdout), buffer, length);
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slen += write(fileno(stdout), "\r\n", 2);
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}
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else
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{
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slen = write(fileno(stdout), "0\r\n\r\n", 5);
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}
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}
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else
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{
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slen = write(fileno(stdout), buffer, length);
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}
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lua_pushnumber(L, slen);
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return 1;
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}
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static int uh_lua_send(lua_State *L)
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{
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return uh_lua_send_common(L, 0);
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}
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static int uh_lua_sendc(lua_State *L)
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{
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return uh_lua_send_common(L, 1);
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}
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static int uh_lua_urldecode(lua_State *L)
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{
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size_t inlen, outlen;
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const char *inbuf;
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char outbuf[UH_LIMIT_MSGHEAD];
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inbuf = luaL_checklstring(L, 1, &inlen);
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outlen = uh_urldecode(outbuf, sizeof(outbuf), inbuf, inlen);
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lua_pushlstring(L, outbuf, outlen);
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return 1;
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}
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lua_State * uh_lua_init(const char *handler)
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{
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lua_State *L = lua_open();
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const char *err_str = NULL;
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/* Load standard libaries */
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luaL_openlibs(L);
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/* build uhttpd api table */
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lua_newtable(L);
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/* register global send and receive functions */
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lua_pushcfunction(L, uh_lua_recv);
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lua_setfield(L, -2, "recv");
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lua_pushcfunction(L, uh_lua_send);
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lua_setfield(L, -2, "send");
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lua_pushcfunction(L, uh_lua_sendc);
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lua_setfield(L, -2, "sendc");
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lua_pushcfunction(L, uh_lua_urldecode);
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lua_setfield(L, -2, "urldecode");
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/* _G.uhttpd = { ... } */
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lua_setfield(L, LUA_GLOBALSINDEX, "uhttpd");
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/* load Lua handler */
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switch( luaL_loadfile(L, handler) )
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{
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case LUA_ERRSYNTAX:
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fprintf(stderr,
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"Lua handler contains syntax errors, unable to continue\n");
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exit(1);
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case LUA_ERRMEM:
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fprintf(stderr,
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"Lua handler ran out of memory, unable to continue\n");
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exit(1);
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case LUA_ERRFILE:
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fprintf(stderr,
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"Lua cannot open the handler script, unable to continue\n");
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exit(1);
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default:
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/* compile Lua handler */
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switch( lua_pcall(L, 0, 0, 0) )
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{
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case LUA_ERRRUN:
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err_str = luaL_checkstring(L, -1);
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fprintf(stderr,
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"Lua handler had runtime error, unable to continue\n"
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"Error: %s\n", err_str
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);
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exit(1);
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case LUA_ERRMEM:
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err_str = luaL_checkstring(L, -1);
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fprintf(stderr,
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"Lua handler ran out of memory, unable to continue\n"
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"Error: %s\n", err_str
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);
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exit(1);
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default:
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/* test handler function */
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lua_getglobal(L, UH_LUA_CALLBACK);
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if( ! lua_isfunction(L, -1) )
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{
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fprintf(stderr,
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"Lua handler provides no " UH_LUA_CALLBACK "(), unable to continue\n");
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exit(1);
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}
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lua_pop(L, 1);
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break;
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}
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break;
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}
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return L;
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}
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void uh_lua_request(struct client *cl, struct http_request *req, lua_State *L)
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{
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int i, data_sent;
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int content_length = 0;
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int buflen = 0;
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int fd_max = 0;
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char *query_string;
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const char *prefix = cl->server->conf->lua_prefix;
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const char *err_str = NULL;
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int rfd[2] = { 0, 0 };
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int wfd[2] = { 0, 0 };
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char buf[UH_LIMIT_MSGHEAD];
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pid_t child;
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fd_set reader;
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fd_set writer;
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struct sigaction sa;
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struct timeval timeout;
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/* spawn pipes for me->child, child->me */
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if( (pipe(rfd) < 0) || (pipe(wfd) < 0) )
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{
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to create pipe: %s", strerror(errno));
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if( rfd[0] > 0 ) close(rfd[0]);
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if( rfd[1] > 0 ) close(rfd[1]);
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if( wfd[0] > 0 ) close(wfd[0]);
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if( wfd[1] > 0 ) close(wfd[1]);
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return;
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}
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switch( (child = fork()) )
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{
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case -1:
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to fork child: %s", strerror(errno));
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break;
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case 0:
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/* restore SIGTERM */
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sa.sa_flags = 0;
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sa.sa_handler = SIG_DFL;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGTERM, &sa, NULL);
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/* close loose pipe ends */
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close(rfd[0]);
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close(wfd[1]);
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/* patch stdout and stdin to pipes */
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dup2(rfd[1], 1);
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dup2(wfd[0], 0);
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/* put handler callback on stack */
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lua_getglobal(L, UH_LUA_CALLBACK);
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/* build env table */
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lua_newtable(L);
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/* request method */
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switch(req->method)
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{
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case UH_HTTP_MSG_GET:
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lua_pushstring(L, "GET");
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break;
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case UH_HTTP_MSG_HEAD:
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lua_pushstring(L, "HEAD");
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break;
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case UH_HTTP_MSG_POST:
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lua_pushstring(L, "POST");
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break;
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}
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lua_setfield(L, -2, "REQUEST_METHOD");
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/* request url */
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lua_pushstring(L, req->url);
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lua_setfield(L, -2, "REQUEST_URI");
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/* script name */
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lua_pushstring(L, cl->server->conf->lua_prefix);
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lua_setfield(L, -2, "SCRIPT_NAME");
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/* query string, path info */
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if( (query_string = strchr(req->url, '?')) != NULL )
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{
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lua_pushstring(L, query_string + 1);
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lua_setfield(L, -2, "QUERY_STRING");
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if( (int)(query_string - req->url) > strlen(prefix) )
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{
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lua_pushlstring(L,
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&req->url[strlen(prefix)],
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(int)(query_string - req->url) - strlen(prefix)
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);
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lua_setfield(L, -2, "PATH_INFO");
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}
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}
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else if( strlen(req->url) > strlen(prefix) )
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{
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lua_pushstring(L, &req->url[strlen(prefix)]);
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lua_setfield(L, -2, "PATH_INFO");
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}
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/* http protcol version */
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lua_pushnumber(L, floor(req->version * 10) / 10);
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lua_setfield(L, -2, "HTTP_VERSION");
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if( req->version > 1.0 )
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lua_pushstring(L, "HTTP/1.1");
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else
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lua_pushstring(L, "HTTP/1.0");
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lua_setfield(L, -2, "SERVER_PROTOCOL");
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/* address information */
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lua_pushstring(L, sa_straddr(&cl->peeraddr));
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lua_setfield(L, -2, "REMOTE_ADDR");
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lua_pushinteger(L, sa_port(&cl->peeraddr));
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lua_setfield(L, -2, "REMOTE_PORT");
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lua_pushstring(L, sa_straddr(&cl->servaddr));
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lua_setfield(L, -2, "SERVER_ADDR");
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lua_pushinteger(L, sa_port(&cl->servaddr));
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lua_setfield(L, -2, "SERVER_PORT");
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/* essential env vars */
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foreach_header(i, req->headers)
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{
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if( !strcasecmp(req->headers[i], "Content-Length") )
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{
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lua_pushnumber(L, atoi(req->headers[i+1]));
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lua_setfield(L, -2, "CONTENT_LENGTH");
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}
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else if( !strcasecmp(req->headers[i], "Content-Type") )
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{
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lua_pushstring(L, req->headers[i+1]);
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lua_setfield(L, -2, "CONTENT_TYPE");
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}
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}
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/* misc. headers */
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lua_newtable(L);
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foreach_header(i, req->headers)
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{
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if( strcasecmp(req->headers[i], "Content-Length") &&
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strcasecmp(req->headers[i], "Content-Type")
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) {
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lua_pushstring(L, req->headers[i+1]);
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lua_setfield(L, -2, req->headers[i]);
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}
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}
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lua_setfield(L, -2, "headers");
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/* call */
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switch( lua_pcall(L, 1, 0, 0) )
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{
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case LUA_ERRMEM:
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case LUA_ERRRUN:
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err_str = luaL_checkstring(L, -1);
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if( ! err_str )
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err_str = "Unknown error";
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printf(
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"HTTP/%.1f 500 Internal Server Error\r\n"
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"Connection: close\r\n"
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"Content-Type: text/plain\r\n"
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"Content-Length: %i\r\n\r\n"
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"Lua raised a runtime error:\n %s\n",
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req->version, 31 + strlen(err_str), err_str
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);
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break;
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default:
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break;
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}
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close(wfd[0]);
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close(rfd[1]);
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exit(0);
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break;
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/* parent; handle I/O relaying */
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default:
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/* close unneeded pipe ends */
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close(rfd[1]);
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close(wfd[0]);
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/* max watch fd */
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fd_max = max(rfd[0], wfd[1]) + 1;
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/* find content length */
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if( req->method == UH_HTTP_MSG_POST )
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{
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foreach_header(i, req->headers)
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{
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if( ! strcasecmp(req->headers[i], "Content-Length") )
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{
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content_length = atoi(req->headers[i+1]);
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break;
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}
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}
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}
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#define ensure(x) \
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do { if( x < 0 ) goto out; } while(0)
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data_sent = 0;
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/* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
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while( 1 )
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{
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FD_ZERO(&reader);
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FD_ZERO(&writer);
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FD_SET(rfd[0], &reader);
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FD_SET(wfd[1], &writer);
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timeout.tv_sec = 15;
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timeout.tv_usec = 0;
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/* wait until we can read or write or both */
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if( select(fd_max, &reader, (content_length > -1) ? &writer : NULL, NULL, &timeout) > 0 )
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{
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/* ready to write to Lua child */
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if( FD_ISSET(wfd[1], &writer) )
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{
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/* there is unread post data waiting */
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if( content_length > 0 )
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{
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/* read it from socket ... */
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if( (buflen = uh_tcp_recv(cl, buf, min(content_length, sizeof(buf)))) > 0 )
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{
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/* ... and write it to child's stdin */
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if( write(wfd[1], buf, buflen) < 0 )
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perror("write()");
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content_length -= buflen;
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}
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/* unexpected eof! */
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else
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{
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if( write(wfd[1], "", 0) < 0 )
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perror("write()");
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content_length = 0;
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}
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}
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/* there is no more post data, close pipe to child's stdin */
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else if( content_length > -1 )
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{
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close(wfd[1]);
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content_length = -1;
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}
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}
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/* ready to read from Lua child */
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if( FD_ISSET(rfd[0], &reader) )
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{
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/* read data from child ... */
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if( (buflen = read(rfd[0], buf, sizeof(buf))) > 0 )
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{
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/* pass through buffer to socket */
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ensure(uh_tcp_send(cl, buf, buflen));
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data_sent = 1;
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}
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/* looks like eof from child */
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else
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{
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/* error? */
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if( ! data_sent )
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"The Lua child did not produce any response");
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break;
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}
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}
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}
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/* no activity for 15 seconds... looks dead */
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else
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{
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ensure(uh_http_sendhf(cl, 504, "Gateway Timeout",
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"The Lua handler took too long to produce a response"));
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break;
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}
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}
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out:
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close(rfd[0]);
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close(wfd[1]);
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if( !kill(child, 0) )
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kill(child, SIGTERM);
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break;
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}
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}
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void uh_lua_close(lua_State *L)
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{
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lua_close(L);
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}
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