libs/lucittpd/src/main.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <netinet/tcp.h>
  28 #include <netdb.h>
  29 #include <arpa/inet.h>
  30 #include <sys/wait.h>
  31 #include <signal.h>
  32 #include <features.h>
  33
  34 #include <lib/uci.h>
  35 #include <lib/log.h>
  36 #include <lib/signal.h>
  37 #include <lib/luaplugin.h>
  38
  39 #ifndef __UCLIBC__
  40 #include <sys/sendfile.h>
  41 #endif
  42
  43 #define BACKLOG 10
  44
  45 static int port = 0;
  46 static const char *plugin_path = NULL;
  47 static struct luaplugin_ctx ctx;
  48 static struct luaplugin_entry *e;
  49 static struct timeval timeout;
  50
  51 static void load_config(void)
  52 {
  53         timeout.tv_usec = 0;
  54
  55         static struct uci_context* uci = 0;
  56         uci = ucix_init("lucittpd");
  57         if(uci)
  58         {
  59                 plugin_path = ucix_get_option(uci, "lucittpd", "lucittpd", "path");
  60                 port = ucix_get_option_int(uci, "lucittpd", "lucittpd", "port", 80);
  61                 timeout.tv_sec = ucix_get_option_int(uci, "lucittpd", "lucittpd", "timeout", 90);
  62         } else {
  63                 port = 8080;
  64                 timeout.tv_sec = 90;
  65         }
  66         if(!plugin_path)
  67                 plugin_path = strdup("/usr/lib/lucittpd/plugins/");
  68
  69         // ToDo: Check why below command segfaults in uci_free_context
  70         //ucix_cleanup(uci);
  71 }
  72
  73 static int webuci_read(lua_State *L)
  74 {
  75         int len = luaL_checkinteger(L, 1);
  76         if (len <= 0) {
  77                 return luaL_argerror(L, 1, "too low");
  78         }
  79
  80         char *buffer = malloc(len);
  81         if (!buffer) {
  82                 return luaL_error(L, "malloc() failed");
  83         }
  84
  85         int sockfd = lua_tointeger(L, lua_upvalueindex(1));
  86
  87         len = read(sockfd, buffer, len);
  88         if (len > 0) {
  89                 lua_pushlstring(L, buffer, len);
  90                 free(buffer);
  91         } else {
  92                 free(buffer);
  93                 lua_pushnil(L);
  94                 lua_pushinteger(L, (len == 0) ? 0 : errno);
  95                 return 2;
  96         }
  97
  98         /* fprintf(stderr, "%s:%s[%d] %d %d\n", __FILE__, __func__, __LINE__, sockfd, len); */
  99
 100         return 1;
 101 }
 102
 103 static int webuci_close(lua_State *L)
 104 {
 105         int sockfd = lua_tointeger(L, lua_upvalueindex(1));
 106         int result = shutdown(sockfd, SHUT_RDWR);
 107         close(sockfd);
 108         /*log_printf("%s:%s[%d] %d %d\n", __FILE__, __func__, __LINE__, sockfd, result);*/
 109
 110         if (result < 0) {
 111                 lua_pushnil(L);
 112                 lua_pushinteger(L, errno);
 113                 return 2;
 114         } else {
 115                 lua_pushboolean(L, 1);
 116                 return 1;
 117         }
 118 }
 119
 120 static int webuci_write(lua_State *L)
 121 {
 122         luaL_checktype(L, 1, LUA_TSTRING);
 123
 124         size_t len;
 125         const char *data = lua_tolstring(L, 1, &len);
 126         int sockfd = lua_tointeger(L, lua_upvalueindex(1));
 127
 128         len = send(sockfd, data, len, 0);
 129         /*log_printf("%s:%s[%d] %d %d - %s\n", __FILE__, __func__, __LINE__, sockfd, len, data);*/
 130         if (len < 0) {
 131                 lua_pushnil(L);
 132                 lua_pushinteger(L, errno);
 133                 return 2;
 134         } else {
 135                 lua_pushinteger(L, len);
 136                 return 1;
 137         }
 138 }
 139
 140 static int webuci_sendfile(lua_State *L)
 141 {
 142         FILE **fp = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE);
 143         if (*fp == NULL) {
 144             return luaL_error(L, "attempt to use a closed file");
 145         }
 146
 147         off_t offset = luaL_checkinteger(L, 2);
 148         size_t size  = luaL_checkinteger(L, 3);
 149
 150         int sockfd = lua_tointeger(L, lua_upvalueindex(1));
 151
 152         int cork = 1;
 153         setsockopt(sockfd, SOL_TCP, TCP_CORK, &cork, sizeof(cork));
 154
 155 #ifdef __UCLIBC__
 156         // uclibc is teh sux, it does not implement sendfile correctly
 157         char tmp[1024];
 158         size_t c, toread = size, oldpos = ftell(*fp);
 159
 160         fseek(*fp, offset, SEEK_SET);
 161
 162         while(toread > 0 && (c = fread(tmp, 1, (toread < 1024) ? toread : 1024, *fp)) > 0)
 163         {
 164                 size += c;
 165                 toread -= c;
 166                 write(sockfd, tmp, c);
 167         }
 168
 169         fseek(*fp, oldpos, SEEK_SET);
 170 #else
 171         size = sendfile(sockfd, fileno(*fp), &offset, size);
 172         /*log_printf("%s:%s[%d] %d %d - %d\n", __FILE__, __func__, __LINE__, sockfd, fileno(*fp), size);*/
 173 #endif
 174
 175         cork = 0;
 176         setsockopt(sockfd, SOL_TCP, TCP_CORK, &cork, sizeof(cork));
 177
 178         if (size < 1) {
 179                 lua_pushnil(L);
 180                 lua_pushinteger(L, errno);
 181         } else {
 182                 lua_pushinteger(L, size);
 183                 lua_pushinteger(L, offset);
 184         }
 185
 186         return 2;
 187 }
 188
 189
 190 static void load_luci(const char *plugindir)
 191 {
 192         luaplugin_init(&ctx, plugindir);
 193         luaplugin_scan(&ctx);
 194
 195         list_for_each_entry(e, &ctx.entries, list)
 196         {
 197                 lua_pushstring(ctx.L, "initialize");
 198                 luaplugin_call(e, 0);
 199         }
 200
 201         list_for_each_entry(e, &ctx.entries, list)
 202         {
 203                 lua_pushstring(ctx.L, "register");
 204                 luaplugin_call(e, 0);
 205         }
 206
 207         list_for_each_entry(e, &ctx.entries, list)
 208         {
 209                 lua_pushstring(ctx.L, "filter");
 210                 luaplugin_call(e, 0);
 211         }
 212 }
 213
 214 static void run_luci(int sockfd)
 215 {
 216         lua_pushinteger(ctx.L, sockfd);
 217         lua_pushcclosure(ctx.L, webuci_read, 1);
 218         lua_setfield(ctx.L, LUA_GLOBALSINDEX, "webuci_read");
 219
 220         lua_pushinteger(ctx.L, sockfd);
 221         lua_pushcclosure(ctx.L, webuci_write, 1);
 222         lua_setfield(ctx.L, LUA_GLOBALSINDEX, "webuci_write");
 223
 224         lua_pushinteger(ctx.L, sockfd);
 225         lua_pushcclosure(ctx.L, webuci_close, 1);
 226         lua_setfield(ctx.L, LUA_GLOBALSINDEX, "webuci_close");
 227
 228         lua_pushinteger(ctx.L, sockfd);
 229         lua_pushcclosure(ctx.L, webuci_sendfile, 1);
 230         lua_setfield(ctx.L, LUA_GLOBALSINDEX, "webuci_sendfile");
 231
 232         list_for_each_entry(e, &ctx.entries, list)
 233         {
 234                 lua_pushstring(ctx.L, "accept");
 235                 luaplugin_call(e, 0);
 236         }
 237 }
 238
 239 static void cleanup_luci(void)
 240 {
 241         luaplugin_done(&ctx);
 242 }
 243
 244 int main(int argc, char **argv)
 245 {
 246         int sockfd, new_fd;
 247         struct sockaddr_storage their_addr;
 248         socklen_t sin_size;
 249         int yes = 1;
 250         struct sockaddr_in myaddr;
 251
 252         log_start(1);
 253
 254         load_config();
 255
 256         setup_signals();
 257
 258         /* used by sdk to override plugin dir */
 259         if(argc != 2)
 260         {
 261                 load_luci(plugin_path);
 262         } else {
 263                 load_luci(argv[1]);
 264                 port = 8080;
 265         }
 266
 267         myaddr.sin_family = AF_INET;
 268         myaddr.sin_port = htons(port);
 269         //inet_pton(AF_INET, "63.161.169.137", &myaddr.sin_addr.s_addr);
 270         myaddr.sin_addr.s_addr = INADDR_ANY;
 271
 272         sockfd = socket(PF_INET, SOCK_STREAM, 0);
 273
 274         if(sockfd == -1)
 275         {
 276                 perror("server: socket");
 277                 exit(1);
 278         }
 279
 280         if(setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1)
 281         {
 282                 perror("setsockopt");
 283                 exit(1);
 284         }
 285
 286         if(bind(sockfd, (struct sockaddr *)&myaddr, sizeof(myaddr)) == -1)
 287         {
 288                 close(sockfd);
 289                 perror("server: bind");
 290                 exit(1);
 291         }
 292
 293         if(listen(sockfd, BACKLOG) == -1)
 294         {
 295                 perror("listen");
 296                 exit(1);
 297         }
 298
 299         /*log_printf("server: waiting for connections...\n");*/
 300
 301         while(1)
 302         {
 303                 sin_size = sizeof their_addr;
 304                 new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
 305                 if(new_fd == -1)
 306                 {
 307                         perror("accept");
 308                         continue;
 309                 }
 310
 311                 /*inet_ntop(their_addr.ss_family,
 312                         (void*)&((struct sockaddr_in*)&their_addr)->sin_addr, s, sizeof s);
 313                 log_printf("server: got connection from %s\n", s);*/
 314
 315                 if(!fork())
 316                 {
 317                         /* child */
 318                         close(sockfd);
 319
 320                         setsockopt(new_fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
 321                         setsockopt(new_fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
 322
 323                         run_luci(new_fd);
 324                         cleanup_luci();
 325                         close(new_fd);
 326
 327                         exit(0);
 328                 }
 329                 close(new_fd);
 330         }
 331
 332         return 0;
 333 }