Annotation of loncom/auth/lonauth.pm, revision 1.106
1.1 albertel 1: # The LearningOnline Network
2: # User Authentication Module
1.27 www 3: #
1.106 ! raeburn 4: # $Id: lonauth.pm,v 1.105 2010/07/17 20:02:02 raeburn Exp $
1.27 www 5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
1.1 albertel 28:
29: package Apache::lonauth;
30:
1.18 albertel 31: use strict;
1.78 albertel 32: use LONCAPA;
1.1 albertel 33: use Apache::Constants qw(:common);
34: use CGI qw(:standard);
1.26 harris41 35: use DynaLoader; # for Crypt::DES version
1.8 www 36: use Crypt::DES;
1.45 matthew 37: use Apache::loncommon();
1.66 albertel 38: use Apache::lonnet;
1.12 www 39: use Apache::lonmenu();
1.90 raeburn 40: use Apache::createaccount;
1.18 albertel 41: use Fcntl qw(:flock);
1.56 www 42: use Apache::lonlocal;
1.101 raeburn 43: use HTML::Entities;
1.85 albertel 44:
1.1 albertel 45: # ------------------------------------------------------------ Successful login
1.85 albertel 46: sub success {
47: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
48: $form) = @_;
1.1 albertel 49:
1.85 albertel 50: # ------------------------------------------------------------ Get cookie ready
51: my $cookie =
52: &Apache::loncommon::init_user_environment($r, $username, $domain,
53: $authhost, $form,
1.86 albertel 54: {'extra_env' => $extra_env,});
1.4 www 55:
1.69 albertel 56: my $public=($username eq 'public' && $domain eq 'public');
57:
1.85 albertel 58: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
1.78 albertel 59:
1.7 www 60: # -------------------------------------------------------------------- Log this
61:
62: &Apache::lonnet::log($domain,$username,$authhost,
63: "Login $ENV{'REMOTE_ADDR'}");
1.4 www 64:
1.14 www 65: # ------------------------------------------------- Check for critical messages
66:
1.21 www 67: my @what=&Apache::lonnet::dump('critical',$domain,$username);
1.14 www 68: if ($what[0]) {
1.22 www 69: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
1.21 www 70: $lowerurl='/adm/email?critical=display';
1.14 www 71: }
72: }
73:
1.5 www 74: # ------------------------------------------------------------ Get cookie ready
1.1 albertel 75: $cookie="lonID=$cookie; path=/";
1.12 www 76: # -------------------------------------------------------- Menu script and info
1.100 raeburn 77: my $destination = $lowerurl;
78:
79: if (defined($form->{role})) {
80: my $envkey = 'user.role.'.$form->{role};
81: my $now=time;
82: my $then=$env{'user.login.time'};
83: my $refresh=$env{'user.refresh.time'};
84: if (exists($env{$envkey})) {
85: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
86: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
87: \$trolecode,\$tstatus,\$tstart,\$tend);
88: if ($tstatus eq 'is') {
1.101 raeburn 89: $destination .= ($destination =~ /\?/) ? '&' : '?';
90: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
91: $destination .= 'selectrole=1&'.$newrole.'=1';
1.100 raeburn 92: }
93: }
94: }
1.101 raeburn 95: if (defined($form->{symb})) {
96: my $destsymb = $form->{symb};
97: $destination .= ($destination =~ /\?/) ? '&' : '?';
98: if ($destsymb =~ /___/) {
99: # FIXME Need to deal with encrypted symbs and urls as needed.
100: my ($map,$resid,$desturl)=split(/___/,$destsymb);
101: unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
102: $desturl = &Apache::lonnet::clutter($desturl);
103: }
104: $desturl = &HTML::Entities::encode($desturl,'"<>&');
105: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
106: $destination .= '&destinationurl='.$desturl.
107: '&destsymb='.$destsymb;
108: } else {
109: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
110: $destination .= '&destinationurl='.$destsymb;
111: }
112: }
1.100 raeburn 113:
1.102 droeschl 114: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
115: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
1.99 bisitz 116: my $brcrum = [{'href' => '',
117: 'text' => 'Successful Login'},];
1.74 albertel 118: my $start_page=&Apache::loncommon::start_page('Successful Login',
1.102 droeschl 119: $header,
1.104 droeschl 120: {'bread_crumbs' => $brcrum,});
1.74 albertel 121: my $end_page =&Apache::loncommon::end_page();
122:
1.102 droeschl 123: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
1.5 www 124: # ------------------------------------------------- Output for successful login
125:
1.74 albertel 126: &Apache::loncommon::content_type($r,'text/html');
127: $r->header_out('Set-cookie' => $cookie);
128: $r->send_http_header;
1.1 albertel 129:
1.58 www 130: my %lt=&Apache::lonlocal::texthash(
131: 'wel' => 'Welcome',
1.92 bisitz 132: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',
133: 'pro' => 'Login problems?',
1.58 www 134: 'log' => 'loginproblems.html',
135: );
1.1 albertel 136: $r->print(<<ENDSUCCESS);
1.74 albertel 137: $start_page
1.19 www 138: $windowinfo
1.58 www 139: <h1>$lt{'wel'}</h1>
1.92 bisitz 140: $lt{'mes'}<p>
141: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
1.64 albertel 142: $continuelink
1.74 albertel 143: $end_page
1.1 albertel 144: ENDSUCCESS
145: }
146:
147: # --------------------------------------------------------------- Failed login!
148:
149: sub failed {
1.85 albertel 150: my ($r,$message,$form) = @_;
1.104 droeschl 151: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
1.100 raeburn 152: my $retry = '/adm/login?username='.$form->{'uname'}.
153: '&domain='.$form->{'udom'};
154: if (exists($form->{role})) {
155: $retry .= '&role='.$form->{role};
156: }
157: if (exists($form->{symb})) {
158: $retry .= '&symb='.$form->{symb};
159: }
1.74 albertel 160: my $end_page = &Apache::loncommon::end_page();
161: &Apache::loncommon::content_type($r,'text/html');
162: $r->send_http_header;
1.92 bisitz 163: $r->print(
164: $start_page
165: .'<h1>'.&mt('Sorry ...').'</h1>'
1.95 bisitz 166: .'<p class="LC_warning">'.&mt($message).'</p>'
1.100 raeburn 167: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
1.92 bisitz 168: .'</p>'
169: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
170: .$end_page
171: );
172: }
1.60 www 173:
1.55 www 174: # ------------------------------------------------------------------ Rerouting!
175:
176: sub reroute {
1.74 albertel 177: my ($r) = @_;
178: &Apache::loncommon::content_type($r,'text/html');
179: $r->send_http_header;
1.92 bisitz 180: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
181: .&mt('Please [_1]log in again[_2].');
1.74 albertel 182: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
1.55 www 183: }
184:
1.1 albertel 185: # ---------------------------------------------------------------- Main handler
186:
187: sub handler {
188: my $r = shift;
1.85 albertel 189: my $form;
1.55 www 190: # Are we re-routing?
191: if (-e '/home/httpd/html/lon-status/reroute.txt') {
192: &reroute($r);
193: return OK;
194: }
1.56 www 195:
1.57 www 196: &Apache::lonlocal::get_language_handle($r);
1.1 albertel 197:
1.59 www 198: # -------------------------------- Prevent users from attempting to login twice
1.89 albertel 199: my $handle = &Apache::lonnet::check_for_valid_session($r);
200: if ($handle ne '') {
1.103 raeburn 201: my $lonidsdir=$r->dir_config('lonIDsDir');
202: if ($handle=~/^publicuser\_/) {
203: # For "public user" - remove it, we apparently really want to login
204: unlink($r->dir_config('lonIDsDir')."/$handle.id");
205: } else {
1.59 www 206: # Indeed, a valid token is found
1.103 raeburn 207: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
208: &Apache::loncommon::content_type($r,'text/html');
209: $r->send_http_header;
210: my $start_page =
211: &Apache::loncommon::start_page('Already logged in');
212: my $end_page =
213: &Apache::loncommon::end_page();
1.105 raeburn 214: my $dest = '/adm/roles';
215: if ($env{'form.firsturl'} ne '') {
216: $dest = $env{'form.firsturl'};
217: }
1.103 raeburn 218: $r->print(
219: $start_page
220: .'<h1>'.&mt('You are already logged in!').'</h1>'
221: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
1.105 raeburn 222: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
1.103 raeburn 223: .'</p>'
224: .$end_page
225: );
226: return OK;
227: }
1.59 www 228: }
229:
230: # ---------------------------------------------------- No valid token, continue
231:
232:
1.1 albertel 233: my $buffer;
1.84 albertel 234: if ($r->header_in('Content-length') > 0) {
235: $r->read($buffer,$r->header_in('Content-length'),0);
236: }
1.85 albertel 237: my %form;
238: foreach my $pair (split(/&/,$buffer)) {
239: my ($name,$value) = split(/=/,$pair);
1.7 www 240: $value =~ tr/+/ /;
241: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.85 albertel 242: $form{$name}=$value;
1.1 albertel 243: }
244:
1.85 albertel 245: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
246: &failed($r,'Username, password and domain need to be specified.',
247: \%form);
1.1 albertel 248: return OK;
249: }
1.61 www 250:
251: # split user logging in and "su"-user
252:
1.85 albertel 253: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
1.87 albertel 254: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
255: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
256: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
1.1 albertel 257:
258: my $role = $r->dir_config('lonRole');
259: my $domain = $r->dir_config('lonDefDomain');
260: my $prodir = $r->dir_config('lonUsersDir');
1.93 raeburn 261: my $contact_name = &mt('LON-CAPA helpdesk');
1.1 albertel 262:
1.8 www 263: # ---------------------------------------- Get the information from login token
264:
1.85 albertel 265: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
266: $form{'serverid'});
1.8 www 267:
268: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
1.85 albertel 269: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
1.8 www 270: return OK;
1.44 www 271: } else {
1.85 albertel 272: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
273: $form{'serverid'});
1.77 albertel 274: if ( $reply ne 'ok' ) {
1.85 albertel 275: &failed($r,'Session could not be opened.',\%form);
276: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
1.77 albertel 277: return OK;
1.44 www 278: }
1.8 www 279: }
1.100 raeburn 280:
1.93 raeburn 281: if (!&Apache::lonnet::domain($form{'udom'})) {
282: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
283: return OK;
284: }
1.100 raeburn 285:
286: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
287: if ($rolestr) {
288: $rolestr = &unescape($rolestr);
289: }
290: if ($symbstr) {
291: $symbstr= &unescape($symbstr);
292: }
293: if ($rolestr =~ /^role=/) {
294: (undef,$form{'role'}) = split('=',$rolestr);
295: }
296: if ($symbstr =~ /^symb=/) {
297: (undef,$form{'symb'}) = split('=',$symbstr);
298: }
1.8 www 299:
300: my $keybin=pack("H16",$key);
301:
1.26 harris41 302: my $cipher;
303: if ($Crypt::DES::VERSION>=2.03) {
304: $cipher=new Crypt::DES $keybin;
305: }
306: else {
307: $cipher=new DES $keybin;
308: }
1.67 www 309: my $upass='';
310: for (my $i=0;$i<=2;$i++) {
311: my $chunk=
1.85 albertel 312: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
1.8 www 313:
1.67 www 314: $chunk.=
1.85 albertel 315: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
1.8 www 316:
1.67 www 317: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
318: $upass.=$chunk;
319: }
1.8 www 320:
1.1 albertel 321: # ---------------------------------------------------------------- Authenticate
1.91 raeburn 322: my @cancreate;
1.90 raeburn 323: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
324: if (ref($domconfig{'usercreation'}) eq 'HASH') {
325: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
1.91 raeburn 326: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
327: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
328: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
329: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
330: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
1.90 raeburn 331: }
332: }
333: }
334: my $defaultauth;
1.91 raeburn 335: if (grep(/^login$/,@cancreate)) {
1.90 raeburn 336: $defaultauth = 1;
337: }
1.105 raeburn 338: my $clientcancheckhost = 1;
1.90 raeburn 339: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
1.105 raeburn 340: $form{'udom'},$defaultauth,
341: $clientcancheckhost);
1.1 albertel 342:
343: # --------------------------------------------------------------------- Failed?
344:
345: if ($authhost eq 'no_host') {
1.85 albertel 346: &failed($r,'Username and/or password could not be authenticated.',
347: \%form);
1.1 albertel 348: return OK;
1.90 raeburn 349: } elsif ($authhost eq 'no_account_on_host') {
350: my %domconfig =
351: &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
1.91 raeburn 352: if (grep(/^login$/,@cancreate)) {
1.105 raeburn 353: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
354: &check_can_host($r,\%form,'no_account_on_host',$domdesc);
1.90 raeburn 355: my $start_page =
1.104 droeschl 356: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
1.93 raeburn 357: my $lonhost = $r->dir_config('lonHostID');
358: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
359: my $contacts =
360: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
361: $form{'udom'},$origmail);
362: my ($contact_email) = split(',',$contacts);
1.94 raeburn 363: my $output = &Apache::createaccount::username_check($form{'uname'},
364: $form{'udom'},$domdesc,'',
365: $lonhost,$contact_email,$contact_name);
1.90 raeburn 366: &Apache::loncommon::content_type($r,'text/html');
367: $r->send_http_header;
368: &Apache::createaccount::print_header($r,$start_page);
1.94 raeburn 369: $r->print('<h3>'.&mt('Account creation').'</h3>'.
370: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
371: $output.&Apache::loncommon::end_page());
1.90 raeburn 372: return OK;
373: } else {
374: &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
375: return OK;
376: }
1.1 albertel 377: }
378:
1.59 www 379: if (($firsturl eq '') ||
380: ($firsturl=~/^\/adm\/(logout|remote)/)) {
1.24 www 381: $firsturl='/adm/roles';
1.7 www 382: }
1.61 www 383: # --------------------------------- Are we attempting to login as somebody else?
1.85 albertel 384: if ($form{'suname'}) {
1.61 www 385: # ------------ see if the original user has enough privileges to pull this stunt
1.85 albertel 386: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
1.61 www 387: # ---------------------------------------------------- see if the su-user exists
1.85 albertel 388: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
1.61 www 389: eq 'no_host') {
1.85 albertel 390: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
1.61 www 391: # ------------------------------ see if the su-user is not too highly privileged
1.85 albertel 392: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
1.61 www 393: # -------------------------------------------------------- actually switch users
1.85 albertel 394: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
395: ' logging in as '.$form{'suname'});
396: $form{'uname'}=$form{'suname'};
1.61 www 397: } else {
398: &Apache::lonnet::logthis('Attempted switch user to privileged user');
399: }
400: }
401: } else {
402: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
403: }
404: }
1.85 albertel 405:
1.105 raeburn 406: &check_can_host($r,\%form,$authhost);
407:
1.81 albertel 408: if ($r->dir_config("lonBalancer") eq 'yes') {
1.85 albertel 409: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
410: \%form);
1.105 raeburn 411: my ($otherserver) = &choose_server($form{'udom'});
412: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
1.81 albertel 413: } else {
1.85 albertel 414: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
415: \%form);
1.81 albertel 416: }
1.1 albertel 417: return OK;
418: }
419:
1.105 raeburn 420: sub check_can_host {
421: my ($r,$form,$authhost,$domdesc) = @_;
422: return unless (ref($form) eq 'HASH');
423: my $canhost = 1;
1.106 ! raeburn 424: my $lonhost = $r->dir_config('lonHostID');
1.105 raeburn 425: my $udom = $form->{'udom'};
1.106 ! raeburn 426: my @intdoms = &Apache::lonnet::get_internet_names($lonhost);
! 427: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
! 428: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
! 429: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
! 430: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
! 431: my $hostname = &Apache::lonnet::hostname($lonhost);
! 432: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
! 433: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
! 434: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
1.105 raeburn 435: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
436: my $loncaparev;
437: if ($authhost eq 'no_account_on_host') {
1.106 ! raeburn 438: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
1.105 raeburn 439: } else {
1.106 ! raeburn 440: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
1.105 raeburn 441: }
1.106 ! raeburn 442: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
! 443: $udomdefaults{'remotesessions'},
! 444: $defdomdefaults{'hostedsessions'});
1.105 raeburn 445: }
446: unless ($canhost) {
447: if ($authhost eq 'no_account_on_host') {
448: my ($login_host,$hostname) = &choose_server($udom);
449: &Apache::loncommon::content_type($r,'text/html');
450: $r->send_http_header;
451: if ($login_host ne '') {
452: my $protocol = $Apache::lonnet::protocol{$login_host};
453: $protocol = 'http' if ($protocol ne 'https');
454: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
455: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
456: '<h3>'.&mt('Account creation').'</h3>'.
457: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
458: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
459: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
460: &Apache::loncommon::end_page());
461: } else {
462: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
463: '<h3>'.&mt('Account creation unavailable').'</h3>'.
464: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
465: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
466: &Apache::loncommon::end_page());
467: }
468: return OK;
469: } else {
470: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
471: $form);
472: my ($otherserver) = &choose_server($udom);
473: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
474: }
475: }
476: }
477:
478: sub choose_server {
479: my ($udom) = @_;
480: my %domconfhash = &Apache::loncommon::get_domainconf($udom);
481: my %servers = &Apache::lonnet::get_servers($udom);
482: my $lowest_load = 30000;
483: my ($login_host,$hostname);
484: foreach my $lonhost (keys(%servers)) {
485: my $loginvia = $domconfhash{$udom.'.login.loginvia_'.$lonhost};
486: if ($loginvia eq '') {
487: ($login_host, $lowest_load) =
488: &Apache::lonnet::compare_server_load($lonhost, $login_host, $lowest_load);
489: }
490: }
491: if ($login_host ne '') {
492: $hostname = $servers{$login_host};
493: }
494: return ($login_host,$hostname);
495: }
496:
1.1 albertel 497: 1;
498: __END__
1.7 www 499:
500:
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