1#!perl 2# 3# asip-status - send DSIGetStatus to an AppleShare IP file server (aka 4# ASIP, aka AFP over TCP port 548). A returned UAM of 5# "No User Authen" means that the server supports guest access. 6# 7# author: James W. Abendschan <jwa@jammed.com> 8# license: GPL - http://www.gnu.org/copyleft/gpl.html 9# url: http://www.jammed.com/~jwa/hacks/security/asip/ 10# Date: 7 May 1997 (v1.0) - original version 11# see also: 12# - http://developer.apple.com/techpubs/macos8/NetworkCommSvcs/AppleShare/ 13# - http://www2.opendoor.com/asip/ (excellent Mac sharing / security site) 14# 15# todo: log in as guest & get a list of shares 16# 17 18# 19# This edition is a part of netatalk 2.2.5. 20# 21 22use strict; 23use IO::Socket; # sucks because Timeout doesn't 24 25my ($arg); 26my ($hostport); 27my ($host); 28my ($port); 29 30while ($arg = shift @ARGV) 31{ 32 $main::show_icon = 1 if ($arg eq "-i"); 33 $main::debug = 1 if ($arg eq "-d"); 34 $main::hexdump = 1 if ($arg eq "-x"); 35 $main::showver = 1 if ($arg eq "-v"); 36 $main::showver = 1 if ($arg eq "-version"); 37 $main::showver = 1 if ($arg eq "--version"); 38 $hostport = $arg if ($arg !~ /^-/); 39} 40 41if ($main::showver ==1) 42{ 43 print "$0\n"; 44 print "Original edition: 7 May 1997 \(v1.0\) James W. Abendschan\n"; 45 print "This edition is a part of Netatalk 2.2.5\n"; 46 exit(-1); 47} 48 49if ($hostport eq "") 50{ 51 print "usage: $0 [-d] [-i] [-x] hostname[:port]\n"; 52 print " $0 -v|-version|--version\n"; 53 print "Queries AFP servers for their capabilities.\n"; 54 print " -d: Enable debug output.\n"; 55 print " -i: Show icon if it exists.\n"; 56 print " -x: Enable hex dump output.\n"; 57 print " -v,-version,--version: Show version.\n"; 58 exit(-1); 59} 60 61($host, $port) = split(/\:/, $hostport); 62$port = "548" if ($port eq ""); 63 64my ($packet) = build_packet(); 65my ($code) = sendpacket($host, $port, $packet); 66exit $code; 67 68 69sub build_packet 70{ 71 my (@packet) = 72 ( 73 0x00, # 0- request, 1-reply 74 0x03, # 3- DSIGetStatus 75 0xde, 0xad, 0x00, # request ID 76 0x00, 0x00, 0x00, 0x00, # data field 77 0x00, 0x00, 0x00, 0x00, # length of data stream header 78 0x00, 0x00, 0x00, 0x00 # reserved 79 ); 80 81 82 my ($packet) = pack("C*", @packet); 83 84 return $packet; 85 86} 87 88sub sendpacket 89{ 90 my ($host, $port, $packet) = @_; 91 my ($b, $buf); 92 93 print "opening $host:$port\n" if ($main::debug); 94 95 my ($asip_sock) = IO::Socket::INET->new( 96 PeerAddr => $host, 97 PeerPort => $port, 98 Proto => 'tcp', 99 Type => SOCK_STREAM, 100 Timeout => 10 101 ) || die "connect to $host failure: $!"; 102 $asip_sock->autoflush(1); 103 104 print "sending packet\n" if ($main::debug); 105 106 my ($count) = syswrite($asip_sock, $packet, length($packet)); 107 108 if ($count != length($packet)) 109 { 110 print "only wrote $count of " . length($packet) . " bytes?\n"; 111 exit(-1); 112 } 113 114 # reply can span multiple packets 115 116 print "sysread: " if ($main::debug); 117 while (sysread($asip_sock, $b, 256)) 118 { 119 $buf .= $b; 120 print "." if ($main::debug); 121 } 122 123 close ($asip_sock); 124 125 print " read " . length($buf) . " bytes\n" if ($main::debug); 126 127 if (length($buf) == 0) 128 { 129 print "empty reply packet?\n"; 130 return -2; 131 } 132 else 133 { 134 print "AFP reply from $host:$port\n"; 135 return (parse_packet($buf)); 136 } 137} 138 139 140sub parse_packet 141{ 142 my ($buf) = shift @_; 143 my (@packet); 144 my ($i); 145 146 hexdump($buf) if ($main::hexdump); 147 148 for ($i=0;$i<length($buf);$i++) 149 { 150 push(@packet, substr($buf, $i, 1)); 151 } 152 153 my ($flags) = unpack("C", @packet[0]); 154 my ($cmd) = unpack("C", @packet[1]); 155 156 my ($request_id) = unpack("n", @packet[2] . @packet[3]); 157 print "Flags: $flags Cmd: $cmd ID: $request_id\n"; 158 159 print getasipsrv("flags", $flags) . ": " . getasipsrv("command", $cmd) . "\n"; 160 print "Request ID: $request_id\n"; 161 162 print "** Request ID didn't match what we sent!\n" if ($request_id != 0xdead); 163 164 # "Error Code / Enclosed Data Offset" 165 # I have never seen this be non-zero .. 166 167 my ($edo) = unpack("N2", @packet[4] . @packet[5] . @packet[6] . @packet[7]); 168 print "** Wow, a non-zero Error/Enclosed Data Offset: $edo\n" if ($edo); 169 170 # "Total Data Length" 171 172 my ($datalen) = unpack("N2", @packet[8] . @packet[9] . @packet[10] . @packet[11]); 173 174 print "Total data length: $datalen\n" if ($main::debug); 175 176 # "Reserved Field" 177 178 my ($reserved) = unpack("N2", @packet[12] . @packet[13] . @packet[14] . @packet[15]); 179 180 print "Reserved field: $reserved\n" if ($reserved); 181 182 if ($cmd != 3) 183 { 184 print "I can only parse packets of reply-type DSIGetStatus (3)\n"; 185 print "This is reply-type " . getasipsrv("command", $cmd) . "\n"; 186 } 187 if ($datalen == 0) 188 { 189 print "No data in packet?\n"; 190 } 191 if (($datalen > 0) && ($cmd == 3)) 192 { 193 my (@AFPpacket) = @packet[($edo+16)..($edo+16+$datalen)]; 194 return (parse_FPGetSrvrInfo(@AFPpacket)); 195 } 196 else 197 { 198 print "I don't know how to parse this type of packet.\n"; 199 return(2); 200 } 201} 202 203 204 205sub parse_FPGetSrvrInfo() 206{ 207 my (@packet) = @_; 208 my ($i); 209 210 my ($machinetype_offset) = unpack("n", @packet[0] . @packet[1]); 211 print "Machine type offset in packet: $machinetype_offset\n" if ($main::debug); 212 my ($machinetype) = extract(1, $machinetype_offset, @packet); 213 print "Machine type: $machinetype\n"; 214 215 my ($afpversioncount_offset) = unpack("n", @packet[2] . @packet[3]); 216 print "AFPversion count offset: $afpversioncount_offset\n" if ($main::debug); 217 my (@afpversions) = extract(0, $afpversioncount_offset, @packet); 218 print "AFP versions: " . join(",", @afpversions) . "\n"; 219 220 my ($uamcount_offset) = unpack("n", @packet[4] . @packet[5]); 221 print "UAMcount offset: $uamcount_offset\n" if ($main::debug); 222 my (@uams) = extract(0, $uamcount_offset, @packet); 223 print "UAMs: " . join(",", @uams) . "\n"; 224 225 my ($allow_guest) = 0; 226 $allow_guest = 1 if (grep(/No User Authen/, @uams)); 227 228 # it would be cute to see the icon. 229 230 my ($icon_offset) = unpack("n", @packet[6] . @packet[7]); 231 print "Volume Icon & Mask offset: $icon_offset\n" if ($main::debug); 232 print "Volume Icon & Mask: exist\n" if ($icon_offset); 233 234 my ($flags) = unpack("n", @packet[8] . @packet[9]); 235 my (@flags) = parse_afp_flags($flags); 236 237 print "Flags: "; 238 print "$flags - " if ($main::debug); 239 print join(",", @flags) . "\n"; 240 241 # server name starts at offset+10, length byte first. 242 243 my ($servername_len) = unpack("C1", @packet[10]); 244 my ($servername) = join("", @packet[11..(11+$servername_len-1)]); 245 print "Server name length: $servername_len\n" if ($main::debug); 246 print "Server name: $servername\n"; 247 248 my ($offset) = 11 + $servername_len; 249 250 # quietly ++ the $offset to account for the padding that happens 251 # in the reply packet if the field names don't align on an even boundary 252 253 $offset++ if ($servername_len % 2 == 0); 254 255 print "New offset: $offset\n" if ($main::debug); 256 257 my ($signature_offset) = unpack("n2", @packet[$offset] . @packet[$offset+1]); 258 print "Signature offset: $signature_offset\n" if ($main::debug); 259 if ($signature_offset) 260 { 261 my ($signature) = join("", @packet[$signature_offset..$signature_offset+15]); 262 263 print "Signature:\n"; 264 hexdump($signature); 265 } 266 267 my ($network_address_count_offset) = unpack("n2", @packet[$offset+2] . @packet[$offset+3]); 268 print "Network address count offset: $network_address_count_offset\n" if ($main::debug); 269 270 extract_network_address($network_address_count_offset, @packet); 271 272 $offset += 4; 273 if ($flags & (1<<8)) { # Supports directory services 274 my ($directory_service_offset) = unpack("n2", @packet[$offset] . @packet[$offset+1]); 275 print "Directory service offset: $directory_service_offset\n" if ($main::debug); 276 if ($directory_service_offset) 277 { 278 my (@dirsvcs) = extract(0, $directory_service_offset, @packet); 279 while (@dirsvcs) 280 { 281 printf "Directory Service: %s\n", shift @dirsvcs; 282 } 283 } 284 $offset +=2; 285 } 286 287 if ($flags & (1<<9)) { # Supports UTF8 servername 288 my ($utf8_name_offset) = unpack("n2", @packet[$offset] . @packet[$offset+1]); 289 print "UTF8 name offset: $utf8_name_offset\n" if ($main::debug); 290 if ($utf8_name_offset) 291 { 292 my ($utf8name) = extract(1, $utf8_name_offset+1, @packet); 293 print "UTF8 Servername: $utf8name\n"; 294 } 295 } 296 297 draw_icon($icon_offset, @packet) if ($main::show_icon && $icon_offset); 298 299 return $allow_guest; 300} 301 302# getsrvbyname .. sorta .. 303 304sub getasipsrv 305{ 306 my ($what, $code) = @_; 307 308 if ($what eq "flags") 309 { 310 return "Request" if ($code == 0); 311 return "Reply" if ($code == 1); 312 } 313 314 if ($what eq "command") 315 { 316 return "DSICloseSession" if ($code == 1); 317 return "DSICommand" if ($code == 2); 318 return "DSIGetStatus" if ($code == 3); 319 return "DSIOpenSession" if ($code == 4); 320 return "DSITickle" if ($code == 5); 321 return "DSIWrite" if ($code == 6); 322 return "DSIAttention" if ($code == 7); 323 } 324 return "[$what/$code] unknown"; 325} 326 327 328# return "counted" data at @packet[$offset] 329# when called with a zero as the first argument, this will 330# look in the packet for the count. Otherwise, it will 331# assume I know what I'm doing. (hah, what a foolish function..) 332 333sub extract 334{ 335 my ($count, $offset, @packet) = @_; 336 my ($i, $j); 337 my (@items, $data); 338 my ($hack); 339 340 if ($count == 0) 341 { 342 ($count) = unpack("C", @packet[$offset]); 343 return if ($count == 0); 344 $offset++; 345 } 346 else 347 { 348 $hack = 1; 349 } 350 #print ">> extracting $count items from offset $offset\n"; 351 for ($i=0;$i<$count;$i++) 352 { 353 #print "Working on count $i\n"; 354 my ($len) = unpack("C1", @packet[$offset]); 355 $data = join("", @packet[$offset+1..$offset+$len]); 356 #print "$i. [$data] ($len)\n"; 357 push (@items, $data); 358 $offset = $offset + $len + 1; 359 #print "new offset is $offset\n"; 360 } 361 return $data if ($hack); 362 return @items; 363} 364 365sub draw_icon 366{ 367 my ($offset, @packet) = @_; 368 my ($cols); 369 my ($i, $j); 370 371 # icons are 32x32 bitmaps; 128 byte icon + 128 byte mask 372 # to show the mask, change 128 to 256. 373 374 for ($i=0;$i<128;$i++) 375 { 376 my ($c) = @packet[$i+$offset]; 377 my ($bin) = unpack ("B*", $c); 378 379 for ($j=0;$j<8;$j++) 380 { 381 if (substr($bin, $j, 1)) 382 { 383 print "#"; 384 } 385 else 386 { 387 print " "; 388 } 389 } 390 $cols++; 391 if ($cols == 4) 392 { 393 $cols = 0; 394 print "\n"; 395 } 396 397 } 398 print "\n"; 399} 400 401 402sub parse_afp_flags 403{ 404 my ($flags) = shift @_; 405 my (@flags); 406 407 # $flags is a 16 bit little-endian number 408 409 push (@flags, "SupportsCopyFile") if ($flags & (1<<0)); 410 push (@flags, "SupportsChgPwd") if ($flags & (1<<1)); 411 push (@flags, "DontAllowSavePwd") if ($flags & (1<<2)); 412 push (@flags, "SupportsServerMessages") if ($flags & (1<<3)); 413 push (@flags, "SupportsServerSignature") if ($flags & (1<<4)); 414 push (@flags, "SupportsTCP/IP") if ($flags & (1<<5)); 415 push (@flags, "SupportsSrvrNotifications") if ($flags & (1<<6)); 416 push (@flags, "SupportsReconnect") if ($flags & (1<<7)); 417 push (@flags, "SupportsOpenDirectory") if ($flags & (1<<8)); 418 push (@flags, "SupportsUTF8Servername") if ($flags & (1<<9)); 419 push (@flags, "SupportsUUIDs") if ($flags & (1<<10)); 420 push (@flags, "SupportsSuperClient") if ($flags & (1<<15)); 421 422 return @flags; 423} 424 425 426sub hexdump 427{ 428 my ($buf) = @_; 429 my ($p, $c, $pc, $str); 430 my ($i); 431 432 for ($i=0;$i<length($buf);$i++) 433 { 434 $p = substr($buf, $i, 1); 435 $c = ord ($p); 436 printf "%.2x ", $c; 437 $pc++; 438 if (($c > 31) && ($c < 127)) 439 { 440 $str .= $p; 441 } 442 else 443 { 444 $str .= "."; 445 } 446 if ($pc == 16) 447 { 448 print " $str\n"; 449 undef $str; 450 $pc = 0; 451 } 452 } 453 print " " x (16 - $pc); 454 print " $str \n"; 455} 456 457 458sub extract_network_address 459{ 460 my ($offset, @packet) = @_; 461 my ($count); 462 my ($i) = 0; 463 my ($data); 464 465 # get the number of addresses 466 ($count) = unpack("C", @packet[$offset]); 467 return if ($count == 0); 468 $offset++; 469 470 #print "\n>> extracting $count items from offset $offset\n"; 471 for ($i=0;$i<$count;$i++) 472 { 473 #print "Working on count $i\n"; 474 my ($len) = unpack("C1", @packet[$offset]); 475 #printf "len: %u\n",$len; 476 my ($type) = unpack("C1", @packet[$offset+1]); 477 #printf "type: %u\n",$type; 478 $data = join("", @packet[$offset+2..$offset+$len-1]); 479 #print "$i. [$data] ($len)\n"; 480 $offset = $offset + $len ; 481 #print "new offset is $offset\n"; 482 483 484 # 1st byte is 'tag' 485 # 1 - IP address; 4 bytes 486 # 2 - IP address (4) + port (2) 487 # 3 - DDP (2 bytes net, 1 byte node, 1 byte socket) 488 # 4 - DNS address 489 # 5 - IP address (4) + port (2), for SSH tunnel 490 # 6 - IPV6 address (16) 491 # 7 - IPV6 address (16) + port (2) 492 493 my (@nap) = unpack("C*", $data); 494 495 if ($type == 1) 496 { 497 # quad 498 my ($ip) = sprintf "%d.%d.%d.%d (TCP/IP address)", 499 $nap[0], $nap[1], @nap[2], @nap[3]; 500 501 print "Network address: $ip\n"; 502 } 503 elsif ($type == 2) 504 { 505 # quad+port 506 my ($ipport) = sprintf "%d.%d.%d.%d:%d", 507 @nap[0], @nap[1], @nap[2], @nap[3], (@nap[4]*256 + @nap[5]); 508 print "Network address: $ipport (TCP/IP address and port)\n"; 509 } 510 elsif ($type == 3) 511 { 512 printf "Network address: %d.%d (ddp address)\n", 513 (@nap[0] * 256) + @nap[1], @nap[2]; 514 } 515 elsif ($type == 4) 516 { 517 print "Network address: $data (DNS address)\n"; 518 } 519 elsif ($type == 5) 520 { 521 # according to the specs this should be an IP address 522 # however, OSX Server uses the FQDN instead 523 print "Network address: $data (SSH tunnel address)\n"; 524 } 525 elsif ($type == 6 || $type == 7) 526 { 527 print "Network address: "; 528 my ($j) = 0; 529 for ( $j = 0; $j<=13; $j = $j+2) { 530 printf("%.2x%.2x:", @nap[$j], @nap[$j+1]); 531 } 532 printf("%.2x%.2x", @nap[14], @nap[15]); 533 if ($type == 7 ) { 534 printf(":%d", (@nap[16]*256) + @nap[17]); 535 print " (IPv6 address + port)\n"; 536 } 537 else { 538 print " (IPv6 address)\n"; 539 } 540 } 541 else 542 { 543 printf "unsupported address type: %u\n", $type; 544 } 545 546 } 547} 548