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// This is a roxen module. Copyright © 1996 - 1998, Idonex AB. 
 
// This is a virtual "file-system". 
// It will be located somewhere in the name-space of the server. 
// Also inherited by some of the other filesystems. 
 
inherit "module"; 
inherit "roxenlib"; 
inherit "socket"; 
 
constant cvs_version= "$Id: filesystem.pike,v 1.34 1998/04/27 14:30:23 grubba Exp $"; 
constant thread_safe=1; 
 
 
#include <module.h> 
#include <roxen.h> 
#include <stat.h> 
 
#if DEBUG_LEVEL > 20 
# ifndef FILESYSTEM_DEBUG 
#  define FILESYSTEM_DEBUG 
# endif 
#endif 
 
// import Array; 
 
#define TRACE_ENTER(A,B) do{if(id->misc->trace_enter)id->misc->trace_enter((A),(B));}while(0) 
#define TRACE_LEAVE(A) do{if(id->misc->trace_leave)id->misc->trace_leave((A));}while(0) 
 
 
int redirects, accesses, errors, dirlists; 
int puts, deletes; 
 
static int do_stat = 1; 
 
string status() 
{ 
  return ("<h2>Accesses to this filesystem</h2>"+ 
          (redirects?"<b>Redirects</b>: "+redirects+"<br>":"")+ 
          (accesses?"<b>Normal files</b>: "+accesses+"<br>" 
           :"No file accesses<br>")+ 
          (QUERY(put)&&puts?"<b>Puts</b>: "+puts+"<br>":"")+ 
          (QUERY(delete)&&deletes?"<b>Deletes</b>: "+deletes+"<br>":"")+ 
          (errors?"<b>Permission denied</b>: "+errors 
           +" (not counting .htaccess)<br>":"")+ 
          (dirlists?"<b>Directories</b>:"+dirlists+"<br>":"")); 
} 
 
void create() 
{ 
  defvar("mountpoint", "/", "Mount point", TYPE_LOCATION,  
         "This is where the module will be inserted in the "+ 
         "namespace of your server."); 
 
  defvar("searchpath", "NONE", "Search path", TYPE_DIR, 
         "This is where the module will find the files in the real "+ 
         "file system"); 
 
#ifdef COMPAT 
  defvar("html", 0, "All files are really HTML files", TYPE_FLAG|VAR_EXPERT, 
         "If you set this variable, the filesystem will _know_ that all files " 
         "are really HTML files. This might be useful now and then."); 
#endif 
 
  defvar(".files", 0, "Show hidden files", TYPE_FLAG|VAR_MORE, 
         "If set, hidden files will be shown in dirlistings and you " 
         "will be able to retrieve them."); 
 
  defvar("dir", 1, "Enable directory listings per default", TYPE_FLAG|VAR_MORE, 
         "If set, you have to create a file named .www_not_browsable (" 
         "or .nodiraccess) in a directory to disable directory listings." 
         " If unset, a file named .www_browsable in a directory will " 
         "_enable_ directory listings.\n"); 
 
  defvar("tilde", 0, "Show backupfiles", TYPE_FLAG|VAR_MORE, 
         "If set, files ending with '~' or '#' or '.bak' will "+ 
         "be shown in directory listings"); 
 
  defvar("put", 0, "Handle the PUT method", TYPE_FLAG, 
         "If set, PUT can be used to upload files to the server."); 
 
  defvar("delete", 0, "Handle the DELETE method", TYPE_FLAG, 
         "If set, DELETE can be used to delete files from the " 
         "server."); 
 
  defvar("check_auth", 1, "Require authentication for modification", 
         TYPE_FLAG, 
         "Only allow authenticated users to use methods other than " 
         "GET and POST. If unset, this filesystem will be a _very_ " 
         "public one (anyone can edit files located on it)"); 
 
  defvar("stat_cache", 1, "Cache the results of stat(2)", 
         TYPE_FLAG|VAR_MORE, 
         "This can speed up the retrieval of files up to 60/70% if you" 
         " use NFS, but it does use some memory."); 
 
  defvar("access_as_user", 0, "Access file as the logged in user", 
         TYPE_FLAG|VAR_MORE, 
         "EXPERIMENTAL. Access file as the logged in user.<br>\n" 
         "This is useful for eg named-ftp."); 
 
  defvar("no_symlinks", 0, "Forbid access to symlinks", TYPE_FLAG|VAR_MORE, 
         "EXPERIMENTAL.\n" 
         "Forbid access to paths containing symbolic links.<br>\n" 
         "NOTE: This can cause *alot* of lstat system-calls to be performed " 
         "and can make the server much slower."); 
} 
 
 
mixed *register_module() 
{ 
  return ({  
    MODULE_LOCATION,  
    "Filesystem",  
    ("This is a virtual filesystem, use it to make files available to "+ 
     "the users of your WWW-server. If you want to serve any 'normal' " 
      "files from your server, you will have to have atleast one filesystem.")  
    }); 
} 
 
string path; 
int stat_cache; 
 
void start() 
{ 
#ifdef THREADS 
  if(QUERY(access_as_user)) 
    report_warning("It is not possible to use 'Access as user' when " 
                   "running with threads. Remove -DENABLE_THREADS from " 
                   "the start script if you really need this function\n"); 
#endif 
      
  path = QUERY(searchpath); 
  stat_cache = QUERY(stat_cache); 
#ifdef FILESYSTEM_DEBUG 
  perror("FILESYSTEM: Online at "+QUERY(mountpoint)+" (path="+path+")\n"); 
#endif 
} 
 
string query_location() 
{ 
  return QUERY(mountpoint); 
} 
 
 
mixed stat_file( mixed f, mixed id ) 
{ 
  array fs; 
  if(stat_cache && !id->pragma["no-cache"] && 
     (fs=cache_lookup("stat_cache",path+f))) 
    return fs[0]; 
 
#ifndef THREADS 
  object privs; 
  if (((int)id->misc->uid) && ((int)id->misc->gid) && 
      (QUERY(access_as_user))) { 
    // NB: Root-access is prevented. 
    privs=Privs("Statting file", (int)id->misc->uid, (int)id->misc->gid ); 
  } 
#endif 
 
  fs = file_stat(path + f);  /* No security currently in this function */ 
#ifndef THREADS 
  privs = 0; 
#endif 
  if(!stat_cache) 
    return fs; 
  cache_set("stat_cache", path+f, ({fs})); 
  return fs; 
} 
 
string real_file( mixed f, mixed id ) 
{ 
  if(this->stat_file( f, id ))  
/* This filesystem might be inherited by other filesystem, therefore 
   'this'  */ 
    return path + f; 
} 
 
int dir_filter_function(string f) 
{ 
  if(f[0]=='.' && !QUERY(.files))           return 0; 
  if(!QUERY(tilde) && backup_extension(f))  return 0; 
  return 1; 
} 
 
array find_dir( string f, object id ) 
{ 
  mixed ret; 
  array dir; 
 
  object privs; 
 
#ifndef THREADS 
  if (((int)id->misc->uid) && ((int)id->misc->gid) && 
      (QUERY(access_as_user))) { 
    // NB: Root-access is prevented. 
    privs=Privs("Getting dir", (int)id->misc->uid, (int)id->misc->gid ); 
  } 
#endif 
 
  if(!(dir = get_dir( path + f ))) { 
    privs = 0; 
    return 0; 
  } 
 
  privs = 0; 
 
  if(!QUERY(dir)) 
    // Access to this dir is allowed. 
    if(search(dir, ".www_browsable") == -1) 
    { 
      errors++; 
      return 0; 
    } 
 
  // Access to this dir is not allowed. 
  if(sizeof(dir & ({".nodiraccess",".www_not_browsable",".nodir_access"}))) 
  { 
    errors++; 
    return 0; 
  } 
 
  dirlists++; 
 
  // Pass _all_ files, hide none. 
  if(QUERY(tilde) && QUERY(.files)) /* This is quite a lot faster */ 
    return dir; 
 
  return Array.filter(dir, dir_filter_function); 
} 
 
 
mapping putting = ([]); 
 
void done_with_put( array(object) id ) 
{ 
//  perror("Done with put.\n"); 
  id[0]->close(); 
  id[1]->write("HTTP/1.0 200 Created\r\nContent-Length: 0\r\n\r\n"); 
  id[1]->close(); 
  m_delete(putting, id[1]); 
  destruct(id[0]); 
  destruct(id[1]); 
} 
 
void got_put_data( array (object) id, string data ) 
{ 
// perror(strlen(data)+" .. "); 
  id[0]->write( data ); 
  putting[id[1]] -= strlen(data); 
  if(putting[id[1]] <= 0) 
    done_with_put( id ); 
} 
 
int _file_size(string X,object id) 
{ 
  array fs; 
  if(!id->pragma["no-cache"]&&(fs=cache_lookup("stat_cache",(X)))) 
  { 
    id->misc->stat = fs[0]; 
    return fs[0]?fs[0][ST_SIZE]:-1; 
  } 
  if(fs = file_stat(X)) 
  { 
    id->misc->stat = fs; 
    cache_set("stat_cache",(X),({fs})); 
    return fs[ST_SIZE]; 
  } else 
    cache_set("stat_cache",(X),({0})); 
  return -1; 
} 
 
#define FILE_SIZE(X) (stat_cache?_file_size((X),id):Stdio.file_size(X)) 
 
int contains_symlinks(string root, string path) 
{ 
  array arr = path/"/"; 
 
  foreach(arr - ({ "" }), path) { 
    root += "/" + path; 
    if (arr = file_stat(root, 1)) { 
      if (arr[1] == -3) { 
        return(1); 
      } 
    } else { 
      return(0); 
    } 
  } 
  return(0); 
} 
 
mixed find_file( string f, object id ) 
{ 
  TRACE_ENTER("find_file(\""+f+"\")", 0); 
 
  object o; 
  int size; 
  string tmp; 
  string oldf = f; 
 
#ifdef FILESYSTEM_DEBUG 
  roxen_perror("FILESYSTEM: Request for \""+f+"\"\n"); 
#endif /* FILESYSTEM_DEBUG */ 
 
  f = path + f; 
#ifdef __NT__ 
  if(f[-1]=='/') f = f[..strlen(f)-2]; 
#endif 
  size = FILE_SIZE( f ); 
 
  switch(id->method) 
  { 
  case "GET": 
  case "HEAD": 
  case "POST": 
   
    switch(-size) 
    { 
    case 1: 
    case 3: 
    case 4: 
      TRACE_LEAVE("No file"); 
      return 0; /* Is no-file */ 
 
    case 2: 
      TRACE_LEAVE("Is directory"); 
      return -1; /* Is dir */ 
 
    default: 
      if(f[ -1 ] == '/') /* Trying to access file with '/' appended */ 
      { 
        /* Do not try redirect on top level directory */ 
        if(sizeof(id->not_query) < 2) 
          return 0; 
        redirects++; 
        TRACE_LEAVE("Redirecting to \"" + 
                    id->not_query[..sizeof(id->not_query)-2] + 
                    "\""); 
        return http_redirect(id->not_query[..sizeof(id->not_query)-2], id); 
      } 
 
      if(!id->misc->internal_get && QUERY(.files) 
         && (tmp = (id->not_query/"/")[-1]) 
         && tmp[0] == '.') { 
        TRACE_LEAVE("Is .-file"); 
        return 0; 
      } 
#ifndef THREADS 
      object privs; 
      if (((int)id->misc->uid) && ((int)id->misc->gid) && 
          (QUERY(access_as_user))) { 
        // NB: Root-access is prevented. 
        privs=Privs("Getting file", (int)id->misc->uid, (int)id->misc->gid ); 
      } 
#endif 
 
      TRACE_ENTER("Opening file \"" + f + "\"", 0); 
      o = open( f, "r" ); 
 
#ifndef THREADS 
      privs = 0; 
#endif 
 
      if(!o || (QUERY(no_symlinks) && (contains_symlinks(path, oldf)))) 
      { 
        errors++; 
        report_error("Open of " + f + " failed. Permission denied.\n"); 
         
        TRACE_LEAVE(""); 
        TRACE_LEAVE("Permission denied."); 
        return http_low_answer(403, "<h2>File exists, but access forbidden " 
                               "by user</h2>"); 
      } 
 
      id->realfile = f; 
      TRACE_LEAVE(""); 
      accesses++; 
#ifdef COMPAT 
      if(QUERY(html)) {/* Not very likely, really.. */ 
        TRACE_LEAVE("Compat return"); 
        return ([ "type":"text/html", "file":o, ]); 
      } 
#endif 
      TRACE_LEAVE("Normal return"); 
      return o; 
    } 
    break; 
   
  case "PUT": 
    if(!QUERY(put)) 
    { 
      id->misc->error_code = 405; 
      TRACE_LEAVE("PUT disallowed"); 
      return 0; 
    }     
 
    if(QUERY(check_auth) && (!id->auth || !id->auth[0])) { 
      TRACE_LEAVE("PUT: Permission denied"); 
      return http_auth_required("foo", 
                                "<h1>Permission to 'PUT' files denied</h1>"); 
    } 
    puts++; 
     
    object privs; 
 
// #ifndef THREADS // Ouch. This is is _needed_. Well well... 
    if (((int)id->misc->uid) && ((int)id->misc->gid)) { 
      // NB: Root-access is prevented. 
      privs=Privs("Saving file", (int)id->misc->uid, (int)id->misc->gid ); 
    } 
// #endif 
 
    if (QUERY(no_symlinks) && (contains_symlinks(path, oldf))) { 
      privs = 0; 
      errors++; 
      report_error("Creation of " + f + " failed. Permission denied.\n"); 
      TRACE_LEAVE("PUT: Contains symlinks. Permission denied"); 
      return http_low_answer(403, "<h2>Permission denied.</h2>"); 
    } 
 
    TRACE_ENTER("PUT: Accepted", 0); 
 
    rm( f ); 
    mkdirhier( f ); 
 
    /* Clear the stat-cache for this file */ 
    if (stat_cache) { 
      cache_set("stat_cache", f, 0); 
    } 
 
    object to = open(f, "wc"); 
 
    privs = 0; 
 
    if(!to) 
    { 
      id->misc->error_code = 403; 
      TRACE_LEAVE("PUT: Open failed"); 
      TRACE_LEAVE("Failure"); 
      return 0; 
    } 
 
    putting[id->my_fd]=id->misc->len; 
    if(id->data && strlen(id->data)) 
    { 
      putting[id->my_fd] -= strlen(id->data); 
      to->write( id->data ); 
    } 
    if(!putting[id->my_fd]) { 
      TRACE_LEAVE("PUT: Just a string"); 
      TRACE_LEAVE("Put: Success"); 
      return http_string_answer("Ok"); 
    } 
 
    if(id->clientprot == "HTTP/1.1") { 
      id->my_fd->write("HTTP/1.1 100 Continue\r\n"); 
    } 
    id->my_fd->set_id( ({ to, id->my_fd }) ); 
    id->my_fd->set_nonblocking(got_put_data, 0, done_with_put); 
    TRACE_LEAVE("PUT: Pipe in progress"); 
    TRACE_LEAVE("PUT: Success so far"); 
    return http_pipe_in_progress(); 
    break; 
 
  case "DELETE": 
    if(!QUERY(delete) || size==-1) 
    { 
      id->misc->error_code = 405; 
      TRACE_LEAVE("DELETE: Disabled"); 
      return 0; 
    } 
    if(QUERY(check_auth) && (!id->auth || !id->auth[0])) { 
      TRACE_LEAVE("DELETE: Permission denied"); 
      return http_low_answer(403, "<h1>Permission to DELETE file denied</h1>"); 
    } 
 
    if (QUERY(no_symlinks) && (contains_symlinks(path, oldf))) { 
      errors++; 
      report_error("Deletion of " + f + " failed. Permission denied.\n"); 
      TRACE_LEAVE("DELETE: Contains symlinks"); 
      return http_low_answer(403, "<h2>Permission denied.</h2>"); 
    } 
 
    report_notice("DELETING the file "+f+"\n"); 
    accesses++; 
 
    if (((int)id->misc->uid) && ((int)id->misc->gid)) { 
      // NB: Root-access is prevented. 
      privs=Privs("Deleting file", id->misc->uid, id->misc->gid ); 
    } 
 
    /* Clear the stat-cache for this file */ 
    if (stat_cache) { 
      cache_set("stat_cache", f, 0); 
    } 
 
    if(!rm(f)) 
    { 
      privs = 0; 
      id->misc->error_code = 405; 
      TRACE_LEAVE("DELETE: Failed"); 
      return 0; 
    } 
    privs = 0; 
    deletes++; 
    TRACE_LEAVE("DELETE: Success"); 
    return http_low_answer(200,(f+" DELETED from the server")); 
 
  default: 
    TRACE_LEAVE("Not supported"); 
    return 0; 
  } 
  report_error("Not reached..\n"); 
  TRACE_LEAVE("Not reached"); 
  return 0; 
} 
 
string query_name() 
{ 
  return sprintf("<i>%s</i> mounted on <i>%s</i>", query("searchpath"), 
                 query("mountpoint")); 
}