webcit/static.c

   1 /*
   2  * This is the main transaction loop of the web service.  It maintains a
   3  * persistent session to the Citadel server, handling HTTP WebCit requests as
   4  * they arrive and presenting a user interface.
   5  */
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <dirent.h>
   9 #include <errno.h>
  10
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14 #include <stddef.h>
  15
  16
  17 #include "webcit.h"
  18 #include "webserver.h"
  19
  20 unsigned char OnePixelGif[37] = {
  21                 0x47,
  22                 0x49,
  23                 0x46,
  24                 0x38,
  25                 0x37,
  26                 0x61,
  27                 0x01,
  28                 0x00,
  29                 0x01,
  30                 0x00,
  31                 0x80,
  32                 0x00,
  33                 0x00,
  34                 0xff,
  35                 0xff,
  36                 0xff,
  37                 0xff,
  38                 0xff,
  39                 0xff,
  40                 0x2c,
  41                 0x00,
  42                 0x00,
  43                 0x00,
  44                 0x00,
  45                 0x01,
  46                 0x00,
  47                 0x01,
  48                 0x00,
  49                 0x00,
  50                 0x02,
  51                 0x02,
  52                 0x44,
  53                 0x01,
  54                 0x00,
  55                 0x3b
  56 };
  57
  58
  59 HashList *StaticFilemappings[5] = {NULL, NULL, NULL, NULL, NULL};
  60 /*
  61   {
  62   syslog(LOG_DEBUG, "Suspicious request. Ignoring.");
  63   hprintf("HTTP/1.1 404 Security check failed\r\n");
  64   hprintf("Content-Type: text/plain\r\n\r\n");
  65   wc_printf("You have sent a malformed or invalid request.\r\n");
  66   end_burst();
  67   }
  68 */
  69
  70
  71 void output_error_pic(const char *ErrMsg1, const char *ErrMsg2)
  72 {
  73         hprintf("HTTP/1.1 200 %s\r\n", ErrMsg1);
  74         hprintf("Content-Type: image/gif\r\n");
  75         hprintf("x-webcit-errormessage: %s\r\n", ErrMsg2);
  76         begin_burst();
  77         StrBufPlain(WC->WBuf, (const char *)OnePixelGif, sizeof(OnePixelGif));
  78         end_burst();
  79 }
  80
  81 /*
  82  * dump out static pages from disk
  83  */
  84 void output_static(const char *what)
  85 {
  86         int fd;
  87         struct stat statbuf;
  88         off_t bytes;
  89         const char *content_type;
  90         int len;
  91         const char *Err;
  92
  93         len = strlen (what);
  94         content_type = GuessMimeByFilename(what, len);
  95         fd = open(what, O_RDONLY);
  96         if (fd <= 0) {
  97                 syslog(LOG_INFO, "output_static('%s') [%s]  -- NOT FOUND --\n", what, ChrPtr(WC->Hdr->this_page));
  98                 if (strstr(content_type, "image/") != NULL)
  99                 {
 100                         output_error_pic("the file you requsted is gone.", strerror(errno));
 101                 }
 102                 else
 103                 {
 104                         hprintf("HTTP/1.1 404 %s\r\n", strerror(errno));
 105                         hprintf("Content-Type: text/plain\r\n");
 106                         begin_burst();
 107                         wc_printf("Cannot open %s: %s\r\n", what, strerror(errno));
 108                         end_burst();
 109                 }
 110         } else {
 111                 if (fstat(fd, &statbuf) == -1) {
 112                         syslog(LOG_INFO, "output_static('%s')  -- FSTAT FAILED --\n", what);
 113                         if (strstr(content_type, "image/") != NULL)
 114                         {
 115                                 output_error_pic("Stat failed!", strerror(errno));
 116                         }
 117                         else
 118                         {
 119                                 hprintf("HTTP/1.1 404 %s\r\n", strerror(errno));
 120                                 hprintf("Content-Type: text/plain\r\n");
 121                                 begin_burst();
 122                                 wc_printf("Cannot fstat %s: %s\n", what, strerror(errno));
 123                                 end_burst();
 124                         }
 125                         if (fd > 0) close(fd);
 126                         return;
 127                 }
 128
 129                 bytes = statbuf.st_size;
 130
 131                 if (StrBufReadBLOB(WC->WBuf, &fd, 1, bytes, &Err) < 0)
 132                 {
 133                         if (fd > 0) close(fd);
 134                         syslog(LOG_INFO, "output_static('%s')  -- FREAD FAILED (%s) --\n", what, strerror(errno));
 135                                 hprintf("HTTP/1.1 500 internal server error \r\n");
 136                                 hprintf("Content-Type: text/plain\r\n");
 137                                 end_burst();
 138                                 return;
 139                 }
 140
 141
 142                 close(fd);
 143                 http_transmit_thing(content_type, 2);
 144         }
 145         if (yesbstr("force_close_session")) {
 146                 end_webcit_session();
 147         }
 148 }
 149
 150
 151 int LoadStaticDir(const char *DirName, HashList *DirList, const char *RelDir)
 152 {
 153         char dirname[PATH_MAX];
 154         char reldir[PATH_MAX];
 155         StrBuf *FileName = NULL;
 156         StrBuf *Dir = NULL;
 157         StrBuf *WebDir = NULL;
 158         StrBuf *OneWebName = NULL;
 159         DIR *filedir = NULL;
 160         struct dirent *d;
 161         struct dirent *filedir_entry;
 162         int d_type = 0;
 163         int d_namelen;
 164         int istoplevel;
 165
 166         if (IsEmptyStr(DirName))
 167         {
 168                 return 0;
 169         }
 170
 171         filedir = opendir (DirName);
 172         if (filedir == NULL)
 173         {
 174                 return 0;
 175         }
 176
 177         d = (struct dirent *)malloc(offsetof(struct dirent, d_name) + PATH_MAX + 1);
 178         if (d == NULL)
 179         {
 180                 closedir(filedir);
 181                 return 0;
 182         }
 183
 184         Dir = NewStrBufPlain(DirName, -1);
 185         WebDir = NewStrBufPlain(RelDir, -1);
 186         istoplevel = IsEmptyStr(RelDir);
 187         OneWebName = NewStrBuf();
 188
 189         while ((readdir_r(filedir, d, &filedir_entry) == 0) &&
 190                (filedir_entry != NULL))
 191         {
 192 #ifdef _DIRENT_HAVE_D_NAMLEN
 193                 d_namelen = filedir_entry->d_namlen;
 194
 195 #else
 196                 d_namelen = strlen(filedir_entry->d_name);
 197 #endif
 198
 199 #ifdef _DIRENT_HAVE_D_TYPE
 200                 d_type = filedir_entry->d_type;
 201 #else
 202
 203 #ifndef DT_UNKNOWN
 204 #define DT_UNKNOWN     0
 205 #define DT_DIR         4
 206 #define DT_REG         8
 207 #define DT_LNK         10
 208
 209 #define IFTODT(mode)   (((mode) & 0170000) >> 12)
 210 #define DTTOIF(dirtype)        ((dirtype) << 12)
 211 #endif
 212                 d_type = DT_UNKNOWN;
 213 #endif
 214                 if ((d_namelen > 1) && filedir_entry->d_name[d_namelen - 1] == '~')
 215                         continue; /* Ignore backup files... */
 216
 217                 if ((d_namelen == 1) &&
 218                     (filedir_entry->d_name[0] == '.'))
 219                         continue;
 220
 221                 if ((d_namelen == 2) &&
 222                     (filedir_entry->d_name[0] == '.') &&
 223                     (filedir_entry->d_name[1] == '.'))
 224                         continue;
 225
 226                 if (d_type == DT_UNKNOWN) {
 227                         struct stat s;
 228                         char path[PATH_MAX];
 229                         snprintf(path, PATH_MAX, "%s/%s",
 230                                 DirName, filedir_entry->d_name);
 231                         if (lstat(path, &s) == 0) {
 232                                 d_type = IFTODT(s.st_mode);
 233                         }
 234                 }
 235
 236                 switch (d_type)
 237                 {
 238                 case DT_DIR:
 239                         /* Skip directories we are not interested in... */
 240                         if ((strcmp(filedir_entry->d_name, ".svn") == 0) ||
 241                             (strcmp(filedir_entry->d_name, "t") == 0))
 242                                 break;
 243                         snprintf(dirname, PATH_MAX, "%s/%s/",
 244                                  DirName, filedir_entry->d_name);
 245                         if (istoplevel)
 246                                 snprintf(reldir, PATH_MAX, "%s/",
 247                                          filedir_entry->d_name);
 248                         else
 249                                 snprintf(reldir, PATH_MAX, "%s/%s/",
 250                                          RelDir, filedir_entry->d_name);
 251                         StripSlashes(dirname, 1);
 252                         StripSlashes(reldir, 1);
 253                         LoadStaticDir(dirname, DirList, reldir);
 254                         break;
 255                 case DT_LNK: /* TODO: check whether its a file or a directory */
 256                 case DT_REG:
 257                         FileName = NewStrBufDup(Dir);
 258                         if (ChrPtr(FileName) [ StrLength(FileName) - 1] != '/')
 259                                 StrBufAppendBufPlain(FileName, "/", 1, 0);
 260                         StrBufAppendBufPlain(FileName, filedir_entry->d_name, d_namelen, 0);
 261
 262                         FlushStrBuf(OneWebName);
 263                         StrBufAppendBuf(OneWebName, WebDir, 0);
 264                         if ((StrLength(OneWebName) != 0) &&
 265                             (ChrPtr(OneWebName) [ StrLength(OneWebName) - 1] != '/'))
 266                                 StrBufAppendBufPlain(OneWebName, "/", 1, 0);
 267                         StrBufAppendBufPlain(OneWebName, filedir_entry->d_name, d_namelen, 0);
 268
 269                         Put(DirList, SKEY(OneWebName), FileName, HFreeStrBuf);
 270                         /* syslog(LOG_DEBUG, "[%s | %s]\n", ChrPtr(OneWebName), ChrPtr(FileName)); */
 271                         break;
 272                 default:
 273                         break;
 274                 }
 275
 276
 277         }
 278         free(d);
 279         closedir(filedir);
 280         FreeStrBuf(&Dir);
 281         FreeStrBuf(&WebDir);
 282         FreeStrBuf(&OneWebName);
 283         return 1;
 284 }
 285
 286
 287 void output_flat_static(void)
 288 {
 289         wcsession *WCC = WC;
 290         void *vFile;
 291         StrBuf *File;
 292
 293         if (WCC->Hdr->HR.Handler == NULL)
 294                 return;
 295         if (GetHash(StaticFilemappings[0], SKEY(WCC->Hdr->HR.Handler->Name), &vFile) &&
 296             (vFile != NULL))
 297         {
 298                 File = (StrBuf*) vFile;
 299                 output_static(ChrPtr(File));
 300         }
 301 }
 302
 303 void output_static_safe(HashList *DirList)
 304 {
 305         wcsession *WCC = WC;
 306         void *vFile;
 307         StrBuf *File;
 308         const char *MimeType;
 309
 310         if (GetHash(DirList, SKEY(WCC->Hdr->HR.ReqLine), &vFile) &&
 311             (vFile != NULL))
 312         {
 313                 File = (StrBuf*) vFile;
 314                 output_static(ChrPtr(File));
 315         }
 316         else {
 317                 syslog(LOG_INFO, "output_static_safe() file %s not found. \n",
 318                         ChrPtr(WCC->Hdr->HR.ReqLine));
 319                 MimeType =  GuessMimeByFilename(SKEY(WCC->Hdr->HR.ReqLine));
 320                 if (strstr(MimeType, "image/") != NULL)
 321                 {
 322                         output_error_pic("the file you requested isn't known to our cache", "maybe reload webcit?");
 323                 }
 324                 else
 325                 {
 326                         do_404();
 327                 }
 328         }
 329 }
 330 void output_static_0(void)
 331 {
 332         output_static_safe(StaticFilemappings[0]);
 333 }
 334 void output_static_1(void)
 335 {
 336         output_static_safe(StaticFilemappings[1]);
 337 }
 338 void output_static_2(void)
 339 {
 340         output_static_safe(StaticFilemappings[2]);
 341 }
 342 void output_static_3(void)
 343 {
 344         output_static_safe(StaticFilemappings[4]);
 345 }
 346
 347
 348 /*
 349  * robots.txt
 350  */
 351 void robots_txt(void) {
 352         output_headers(0, 0, 0, 0, 0, 0);
 353
 354         hprintf("Content-type: text/plain\r\n"
 355                 "Server: %s\r\n"
 356                 "Connection: close\r\n",
 357                 PACKAGE_STRING);
 358         begin_burst();
 359
 360         wc_printf("User-agent: *\r\n"
 361                 "Disallow: /printmsg\r\n"
 362                 "Disallow: /msgheaders\r\n"
 363                 "Disallow: /groupdav\r\n"
 364                 "Disallow: /do_template\r\n"
 365                 "Disallow: /static\r\n"
 366                 "Disallow: /display_page\r\n"
 367                 "Disallow: /readnew\r\n"
 368                 "Disallow: /display_enter\r\n"
 369                 "Disallow: /skip\r\n"
 370                 "Disallow: /ungoto\r\n"
 371                 "Sitemap: %s/sitemap.xml\r\n"
 372                 "\r\n"
 373                 ,
 374                 ChrPtr(site_prefix)
 375         );
 376
 377         wDumpContent(0);
 378 }
 379
 380
 381 void
 382 ServerStartModule_STATIC
 383 (void)
 384 {
 385         StaticFilemappings[0] = NewHash(1, NULL);
 386         StaticFilemappings[1] = NewHash(1, NULL);
 387         StaticFilemappings[2] = NewHash(1, NULL);
 388         StaticFilemappings[3] = NewHash(1, NULL);
 389         StaticFilemappings[4] = NewHash(1, NULL);
 390 }
 391 void
 392 ServerShutdownModule_STATIC
 393 (void)
 394 {
 395         DeleteHash(&StaticFilemappings[0]);
 396         DeleteHash(&StaticFilemappings[1]);
 397         DeleteHash(&StaticFilemappings[2]);
 398         DeleteHash(&StaticFilemappings[3]);
 399         DeleteHash(&StaticFilemappings[4]);
 400 }
 401
 402
 403 void
 404 InitModule_STATIC
 405 (void)
 406 {
 407         LoadStaticDir(static_dirs[0], StaticFilemappings[0], "");
 408         LoadStaticDir(static_dirs[1], StaticFilemappings[1], "");
 409         LoadStaticDir(static_dirs[2], StaticFilemappings[2], "");
 410         LoadStaticDir(static_dirs[3], StaticFilemappings[3], "");
 411         LoadStaticDir(static_dirs[4], StaticFilemappings[4], "");
 412
 413         WebcitAddUrlHandler(HKEY("robots.txt"), "", 0, robots_txt, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 414         WebcitAddUrlHandler(HKEY("favicon.ico"), "", 0, output_flat_static, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 415         WebcitAddUrlHandler(HKEY("static"), "", 0, output_static_0, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 416         WebcitAddUrlHandler(HKEY("static.local"), "", 0, output_static_1, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 417         WebcitAddUrlHandler(HKEY("tinymce"), "", 0, output_static_2, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 418         WebcitAddUrlHandler(HKEY("tiny_mce"), "", 0, output_static_2, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 419         WebcitAddUrlHandler(HKEY("epiceditor"), "", 0, output_static_3, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC|LOGCHATTY);
 420 }