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[SCM] gawk branch, gawk-5.1-stable, updated. gawk-4.1.0-4189-gce2fcf7
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From: |
Arnold Robbins |
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Subject: |
[SCM] gawk branch, gawk-5.1-stable, updated. gawk-4.1.0-4189-gce2fcf7 |
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Date: |
Sun, 27 Dec 2020 14:44:40 -0500 (EST) |
This is an automated email from the git hooks/post-receive script. It was
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the project "gawk".
The branch, gawk-5.1-stable has been updated
via ce2fcf704aac494b44c78a34c714732685dfc1ad (commit)
from e4f1018b3b4ff27d109832210a2e5914e62f9bf9 (commit)
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- Log -----------------------------------------------------------------
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=ce2fcf704aac494b44c78a34c714732685dfc1ad
commit ce2fcf704aac494b44c78a34c714732685dfc1ad
Author: Arnold D. Robbins <arnold@skeeve.com>
Date: Sun Dec 27 21:44:25 2020 +0200
More updates to gawkinet.texi.
diff --git a/awklib/eg/network/fingerclient.awk
b/awklib/eg/network/catpipeclient.awk
similarity index 50%
copy from awklib/eg/network/fingerclient.awk
copy to awklib/eg/network/catpipeclient.awk
index bcc2c94..c129a1e 100644
--- a/awklib/eg/network/fingerclient.awk
+++ b/awklib/eg/network/catpipeclient.awk
@@ -1,6 +1,6 @@
BEGIN {
- NetService = "/inet/tcp/0/localhost/finger"
- print "var{name}" |& NetService
+ NetService = "/inet/tcp/0/localhost/8888"
+ print "README" |& NetService
while ((NetService |& getline) > 0)
print $0
close(NetService)
diff --git a/awklib/eg/network/catpipeserver.awk
b/awklib/eg/network/catpipeserver.awk
new file mode 100644
index 0000000..f3ab0c1
--- /dev/null
+++ b/awklib/eg/network/catpipeserver.awk
@@ -0,0 +1,8 @@
+BEGIN {
+ NetService = "/inet/tcp/8888/0/0"
+ NetService |& getline # sets $0 and the fields
+ CatPipe = ("cat " $1)
+ while ((CatPipe | getline) > 0)
+ print $0 |& NetService
+ close(NetService)
+}
diff --git a/awklib/eg/network/daytimeserver.awk
b/awklib/eg/network/daytimeserver.awk
new file mode 100644
index 0000000..f2ed76e
--- /dev/null
+++ b/awklib/eg/network/daytimeserver.awk
@@ -0,0 +1,4 @@
+BEGIN {
+ print strftime() |& "/inet/tcp/8888/0/0"
+ close("/inet/tcp/8888/0/0")
+}
diff --git a/awklib/eg/network/fingerclient.awk
b/awklib/eg/network/fingerclient.awk
index bcc2c94..d2ed9fd 100644
--- a/awklib/eg/network/fingerclient.awk
+++ b/awklib/eg/network/fingerclient.awk
@@ -1,7 +1,8 @@
BEGIN {
- NetService = "/inet/tcp/0/localhost/finger"
- print "var{name}" |& NetService
- while ((NetService |& getline) > 0)
+ finger_server = "andrew.cmu.edu"
+ finger_connection = "/inet/tcp/0/" finger_server "/finger"
+ print "wnace" |& finger_connection
+ while ((finger_connection |& getline) > 0)
print $0
- close(NetService)
+ close(finger_connection)
}
diff --git a/doc/ChangeLog b/doc/ChangeLog
index ee055f3..cdd1d56 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2020-12-27 Juergen Kahrs <Juergen.Kahrs@googlemail.com>
+
+ * gawkinet.texi: Update finger client, add catpipe
+ client and server.
+
2020-12-26 Juergen Kahrs <Juergen.Kahrs@googlemail.com>
* gawkinet.texi: Update datetime client.
diff --git a/doc/gawkinet.info b/doc/gawkinet.info
index 16313b6..4b41d6f 100644
--- a/doc/gawkinet.info
+++ b/doc/gawkinet.info
@@ -776,12 +776,11 @@ network programming.
For the rest of this major node, we will assume you work on a
POSIX-style system that supports TCP/IP. If the previous example program
-does not run on your machine, it may help to replace the name
-'localhost' with the name of your machine or its IP address. If it
-does, you could replace 'localhost' with the name of another machine in
-your vicinity--this way, the program connects to another machine. Now
-you should see the date and time being printed by the program, otherwise
-your machine may not support the 'daytime' service.
+does not run on your machine, it may help to replace the value assigned
+to the variable 'daytime_server' with the name (or the IP address) of
+another server from the list mentioned above. Now you should see the
+date and time being printed by the program, otherwise you may have run
+out of servers that support the 'daytime' service.
Try changing the service to 'chargen' or 'ftp'. This way, the
program connects to other services that should give you some response.
@@ -853,23 +852,29 @@ File: gawkinet.info, Node: Interacting, Next: Setting
Up, Prev: Troubleshooti
The next program begins really interacting with a network service by
printing something into the special file. It asks the so-called
'finger' service if a user of the machine is logged in. When testing
-this program, try to change 'localhost' to some other machine name in
-your local network:
+this program, try to change the variable 'finger_server' to some other
+machine name in your local network:
BEGIN {
- NetService = "/inet/tcp/0/localhost/finger"
- print "NAME" |& NetService
- while ((NetService |& getline) > 0)
+ finger_server = "andrew.cmu.edu"
+ finger_connection = "/inet/tcp/0/" finger_server "/finger"
+ print "wnace" |& finger_connection
+ while ((finger_connection |& getline) > 0)
print $0
- close(NetService)
+ close(finger_connection)
}
After telling the service on the machine which user to look for, the
program repeatedly reads lines that come as a reply. When no more lines
are available (because the service has closed the connection), the
-program also closes the connection. Try replacing '"NAME"' with your
-login name (or the name of someone else logged in). For a list of all
-users currently logged in, replace NAME with an empty string ('""').
+program also closes the connection. If you tried to replace
+'finger_server' with some other server name, the script probably
+reported being unable to open the connection, because most servers today
+no longer support this service. Try replacing the login name of
+Professor Nace ('wnace') with another login name (like 'help'). You
+will receive a list of login names similar to the one you asked for. In
+the 1980s you could get a list of all users currently logged in by
+asking for an empty string ('""').
The final 'close()' call could be safely deleted from the above
script, because the operating system closes any open connection by
@@ -880,17 +885,19 @@ in flushing of buffers. Letting the close happen by
default may result
in discarding buffers.
When looking at '/etc/services' you may have noticed that the
-'daytime' service is also available with 'udp'. In the earlier example,
-change 'tcp' to 'udp', and change 'finger' to 'daytime'. After starting
-the modified program, you see the expected day and time message. The
-program then hangs, because it waits for more lines to come from the
-service. However, they never do. This behavior is a consequence of the
-differences between TCP and UDP. When using UDP, neither party is
-automatically informed about the other closing the connection.
-Continuing to experiment this way reveals many other subtle differences
-between TCP and UDP. To avoid such trouble, you should always remember
-the advice Douglas E. Comer and David Stevens give in Volume III of
-their series 'Internetworking With TCP' (page 14):
+'daytime' service is also available with 'udp'. In the earlier
+examples, change 'tcp' to 'udp' and try if the 'finger' and 'daytime'
+clients still work as expected. They probably will not respond because
+a wise administrator switched off these services. But if they do, you
+may see the expected day and time message. The program then hangs,
+because it waits for more lines to come from the service. However, they
+never do. This behavior is a consequence of the differences between TCP
+and UDP. When using UDP, neither party is automatically informed about
+the other closing the connection. Continuing to experiment this way
+reveals many other subtle differences between TCP and UDP. To avoid such
+trouble, you should always remember the advice Douglas E. Comer and
+David Stevens give in Volume III of their series 'Internetworking With
+TCP' (page 14):
When designing client-server applications, beginners are strongly
advised to use TCP because it provides reliable,
@@ -899,6 +906,24 @@ their series 'Internetworking With TCP' (page 14):
hardware broadcast or multicast, or the application cannot tolerate
virtual circuit overhead.
+ This advice is actually quite dated and we hesitated to repeat it
+here. But we left it in because we are still observing beginners
+running into this pitfall. While this advice has aged quite well, some
+other ideas from the 1980s have not. The 'finger' service may still be
+available in Microsoft Windows Server 2019
+(https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/finger),
+but it turned out to be a never-ending cause of trouble. First of all,
+it is now obvious that a server should never reveal personal data about
+its users to anonymous client software that connects over the wild wild
+Internet. So every server on the Internet should reject 'finger'
+requests (by disabling the port and by disabling the software serving
+this port). But things got even worse in 2020 when it turned out that
+even the client software (the 'finger' command documented in the link
+above) is a security problem. A tool called DarkFinger
+(https://seclists.org/fulldisclosure/2020/Sep/30) allows to leverage the
+Microsoft Windows 'finger.exe' as a file downloader and help evade
+network security devices.
+
File: gawkinet.info, Node: Setting Up, Next: Email, Prev: Interacting, Up:
Using Networking
@@ -928,11 +953,13 @@ setting up a server, not a client:
Now open another window on the same machine. Copy the client program
given as the first example (*note Establishing a TCP Connection: TCP
-Connecting.) to a new file and edit it, changing the name 'daytime' to
-'8888'. Then start the modified client. You should get a reply like
-this:
+Connecting.) to a new file and edit it, changing the variable
+'daytime_server' to 'localhost' and the port name 'daytime' to '8888'.
+Then start the modified client. You should get a reply like this:
- Sat Sep 27 19:08:16 CEST 1997
+ $ gawk -f awklib/eg/network/daytimeclient.awk
+ -| Sun Dec 27 17:33:57 CET 2020
+ -| Sun Dec 27 17:33:57 CET 2020
Both programs explicitly close the connection.
@@ -979,6 +1006,19 @@ security hole on your machine. If you allow clients to
connect to your
machine and execute arbitrary commands, anyone would be free to do 'rm
-rf *'.
+ The client side connects to port number 8888 on the server side and
+sends the name of the desired file to be sent across the same TCP
+connection. The main loop reads all content coming in from the TCP
+connection line-wise and prints it.
+
+ BEGIN {
+ NetService = "/inet/tcp/0/localhost/8888"
+ print "README" |& NetService
+ while ((NetService |& getline) > 0)
+ print $0
+ close(NetService)
+ }
+
File: gawkinet.info, Node: Email, Next: Web page, Prev: Setting Up, Up:
Using Networking
@@ -4247,8 +4287,8 @@ Index
* GIF image format <1>: STATIST. (line 6)
* GNU Free Documentation License: GNU Free Documentation License.
(line 6)
-* GNU/Linux: Troubleshooting. (line 54)
-* GNU/Linux <1>: Interacting. (line 27)
+* GNU/Linux: Troubleshooting. (line 53)
+* GNU/Linux <1>: Interacting. (line 33)
* GNU/Linux <2>: REMCONF. (line 6)
* GNUPlot utility: Interacting Service. (line 190)
* GNUPlot utility <1>: STATIST. (line 6)
@@ -4269,16 +4309,16 @@ Index
* images, in web pages: Interacting Service. (line 190)
* input/output, two-way,: Gawk Special Files. (line 19)
* JavaScript: STATIST. (line 57)
-* Linux: Troubleshooting. (line 54)
-* Linux <1>: Interacting. (line 27)
+* Linux: Troubleshooting. (line 53)
+* Linux <1>: Interacting. (line 33)
* Linux <2>: REMCONF. (line 6)
* Lisp: MOBAGWHO. (line 96)
* localport field: Gawk Special Files. (line 34)
* Loebner, Hugh: Challenges. (line 6)
* Loui, Ronald: Challenges. (line 75)
* MAZE: MAZE. (line 6)
-* Microsoft Windows, networking: Troubleshooting. (line 54)
-* Microsoft Windows, networking, ports: Setting Up. (line 37)
+* Microsoft Windows, networking: Troubleshooting. (line 53)
+* Microsoft Windows, networking, ports: Setting Up. (line 39)
* Microsoft Windows: WEBGRAB. (line 43)
* MiniSQL: REMCONF. (line 109)
* MOBAGWHO program: MOBAGWHO. (line 6)
@@ -4291,7 +4331,7 @@ Index
* networks, gawk and, connections: Special File Fields. (line 56)
* networks, gawk and, connections <1>: TCP Connecting. (line 6)
* networks, gawk and, service, establishing: Setting Up. (line 6)
-* networks, ports, reserved: Setting Up. (line 37)
+* networks, ports, reserved: Setting Up. (line 39)
* networks, gawk and, email: Email. (line 6)
* networks, gawk and, troubleshooting: Caveats. (line 6)
* Numerical Recipes: STATIST. (line 13)
@@ -4349,7 +4389,7 @@ Index
* TCP (Transmission Control Protocol) <1>: File /inet/tcp. (line 6)
* TCP (Transmission Control Protocol), connection, establishing: TCP
Connecting.
(line 6)
-* TCP (Transmission Control Protocol), UDP and: Interacting. (line 48)
+* TCP (Transmission Control Protocol), UDP and: Interacting. (line 56)
* TCP/IP, sockets and: Gawk Special Files. (line 19)
* TCP/IP, network type, selecting: Special File Fields. (line 11)
* TCP/IP, protocols, selecting: Special File Fields. (line 17)
@@ -4357,8 +4397,8 @@ Index
* troubleshooting, gawk, networks: Caveats. (line 6)
* troubleshooting, networks, timeouts: Caveats. (line 18)
* UDP (User Datagram Protocol): File /inet/udp. (line 6)
-* UDP (User Datagram Protocol), TCP and: Interacting. (line 48)
-* Unix, network ports and: Setting Up. (line 37)
+* UDP (User Datagram Protocol), TCP and: Interacting. (line 56)
+* Unix, network ports and: Setting Up. (line 39)
* URLCHK program: URLCHK. (line 6)
* vertical bar (|), |& operator (I/O): TCP Connecting. (line 29)
* VRML: MAZE. (line 6)
@@ -4400,39 +4440,39 @@ Node: File /inet/udp27933
Ref: File /inet/udp-Footnote-129645
Node: TCP Connecting29899
Node: Troubleshooting33332
-Ref: Troubleshooting-Footnote-136160
-Node: Interacting37117
-Node: Setting Up39841
-Node: Email43813
-Node: Web page46196
-Ref: Web page-Footnote-149016
-Ref: Web page-Footnote-249214
-Node: Primitive Service49708
-Node: Interacting Service52442
-Ref: Interacting Service-Footnote-161597
-Node: CGI Lib61629
-Node: Simple Server68629
-Ref: Simple Server-Footnote-176431
-Node: Caveats76532
-Node: Challenges77675
-Ref: Challenges-Footnote-186417
-Node: Some Applications and Techniques86518
-Node: PANIC88979
-Node: GETURL90705
-Node: REMCONF93338
-Node: URLCHK98834
-Node: WEBGRAB102678
-Node: STATIST107142
-Ref: STATIST-Footnote-1120290
-Node: MAZE120733
-Node: MOBAGWHO126958
-Ref: MOBAGWHO-Footnote-1140860
-Node: STOXPRED140928
-Node: PROTBASE155220
-Ref: PROTBASE-Footnote-1168387
-Node: Links168502
-Node: GNU Free Documentation License171393
-Node: Index196513
+Ref: Troubleshooting-Footnote-136096
+Node: Interacting37053
+Node: Setting Up41411
+Node: Email45960
+Node: Web page48343
+Ref: Web page-Footnote-151163
+Ref: Web page-Footnote-251361
+Node: Primitive Service51855
+Node: Interacting Service54589
+Ref: Interacting Service-Footnote-163744
+Node: CGI Lib63776
+Node: Simple Server70776
+Ref: Simple Server-Footnote-178578
+Node: Caveats78679
+Node: Challenges79822
+Ref: Challenges-Footnote-188564
+Node: Some Applications and Techniques88665
+Node: PANIC91126
+Node: GETURL92852
+Node: REMCONF95485
+Node: URLCHK100981
+Node: WEBGRAB104825
+Node: STATIST109289
+Ref: STATIST-Footnote-1122437
+Node: MAZE122880
+Node: MOBAGWHO129105
+Ref: MOBAGWHO-Footnote-1143007
+Node: STOXPRED143075
+Node: PROTBASE157367
+Ref: PROTBASE-Footnote-1170534
+Node: Links170649
+Node: GNU Free Documentation License173540
+Node: Index198660
End Tag Table
diff --git a/doc/gawkinet.texi b/doc/gawkinet.texi
index e648283..47d9a95 100644
--- a/doc/gawkinet.texi
+++ b/doc/gawkinet.texi
@@ -970,12 +970,11 @@ DECnet or Novell's IPX.
For the rest of this @value{CHAPTER}, we will assume you work on a POSIX-style
system that supports TCP/IP. If the previous example program does not
-run on your machine, it may help to replace the name
-@samp{localhost} with the name of your machine or its IP address. If it
-does, you could replace @samp{localhost} with the name of another machine
-in your vicinity---this way, the program connects to another machine.
+run on your machine, it may help to replace the value assigned to the variable
+@samp{daytime_server} with the name (or the IP address) of another server
+from the list mentioned above.
Now you should see the date and time being printed by the program,
-otherwise your machine may not support the @samp{daytime} service.
+otherwise you may have run out of servers that support the @samp{daytime}
service.
Try changing the service to @samp{chargen} or @samp{ftp}. This way, the program
connects to other services that should give you some response. If you are
@@ -1050,17 +1049,21 @@ well as UDP.
The next program begins really interacting with a
network service by printing something into the special file. It asks the
so-called @command{finger} service if a user of the machine is logged in. When
-testing this program, try to change @samp{localhost} to
-some other machine name in your local network:
+testing this program, try to change the variable @samp{finger_server}
+to some other machine name in your local network:
+@c This really worked in 2020.
+@c Thanks to some people at cmu.edu who keep this service alive.
+@c
https://www.techrepublic.com/article/everything-you-need-to-know-about-tcp-ips-finger-utility/
@example
@c file eg/network/fingerclient.awk
BEGIN @{
- NetService = "/inet/tcp/0/localhost/finger"
- print "@var{name}" |& NetService
- while ((NetService |& getline) > 0)
+ finger_server = "andrew.cmu.edu"
+ finger_connection = "/inet/tcp/0/" finger_server "/finger"
+ print "wnace" |& finger_connection
+ while ((finger_connection |& getline) > 0)
print $0
- close(NetService)
+ close(finger_connection)
@}
@c endfile
@end example
@@ -1068,10 +1071,13 @@ BEGIN @{
After telling the service on the machine which user to look for,
the program repeatedly reads lines that come as a reply. When no more
lines are available (because the service has closed the connection), the
-program also closes the connection. Try replacing @code{"@var{name}"} with your
-login name (or the name of someone else logged in). For a list
-of all users currently logged in, replace @var{name} with an empty string
-(@code{""}).
+program also closes the connection. If you tried to replace
@samp{finger_server}
+with some other server name, the script probably reported being unable to
+open the connection, because most servers today no longer support this
+service. Try replacing the login name of Professor Nace (@code{wnace})
+with another login name (like @code{help}). You will receive a list of
+login names similar to the one you asked for. In the 1980s you could get
+a list of all users currently logged in by asking for an empty string
(@code{""}).
@cindex Linux
@cindex GNU/Linux
@@ -1087,9 +1093,10 @@ the close happen by default may result in discarding
buffers.
When looking at @file{/etc/services} you may have noticed that the
@samp{daytime} service is also available with @samp{udp}. In the earlier
-example, change @samp{tcp} to @samp{udp},
-and change @samp{finger} to @samp{daytime}.
-After starting the modified program, you see the expected day and time message.
+examples, change @samp{tcp} to @samp{udp} and try if the @samp{finger} and
@samp{daytime}
+clients still work as expected. They probably will not respond because
+a wise administrator switched off these services.
+But if they do, you may see the expected day and time message.
The program then hangs, because it waits for more lines to come from the
service. However, they never do. This behavior is a consequence of the
differences between TCP and UDP. When using UDP, neither party is
@@ -1111,6 +1118,24 @@ reliability, the application requires hardware broadcast
or multicast,
or the application cannot tolerate virtual circuit overhead.
@end quotation
+This advice is actually quite dated and we hesitated to repeat it here.
+But we left it in because we are still observing beginners running
+into this pitfall. While this advice has aged quite well, some other
+ideas from the 1980s have not. The @samp{finger} service may still be
+available in Microsoft
+@uref{https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/finger,
Windows Server 2019},
+but it turned out to be a never-ending cause of trouble. First of all,
+it is now obvious that a server should never reveal personal data about
+its users to anonymous client software that connects over the wild wild
Internet.
+So every server on the Internet should reject @samp{finger} requests
+(by disabling the port and by disabling the software serving this port).
+But things got even worse in 2020 when it turned out that even the client
+software (the @samp{finger} command documented in the link above) is a
+security problem. A tool called
+@uref{https://seclists.org/fulldisclosure/2020/Sep/30, DarkFinger}
+allows to leverage the Microsoft Windows @samp{finger.exe} as a file downloader
+and help evade network security devices.
+
@node Setting Up, Email, Interacting, Using Networking
@section Setting Up a Service
@c last comma is part of tertiary
@@ -1136,22 +1161,25 @@ of the special @value{FN} because we are setting up a
server, not a client:
@cindex @command{finger} utility
@cindex servers
@example
+@c file eg/network/daytimeserver.awk
BEGIN @{
print strftime() |& "/inet/tcp/8888/0/0"
close("/inet/tcp/8888/0/0")
@}
+@c endfile
@end example
Now open another window on the same machine.
Copy the client program given as the first example
(@pxref{TCP Connecting, ,Establishing a TCP Connection})
-to a new file and edit it, changing the name @samp{daytime} to
-@samp{8888}. Then start the modified client. You should get a reply
-like this:
+to a new file and edit it, changing the variable @samp{daytime_server} to
+@samp{localhost} and the port name @samp{daytime} to @samp{8888}.
+Then start the modified client. You should get a reply like this:
-@c FIXME: Let's put a newer date here...
@example
-Sat Sep 27 19:08:16 CEST 1997
+$ @kbd{gawk -f awklib/eg/network/daytimeclient.awk}
+@print{} Sun Dec 27 17:33:57 CET 2020
+@print{} Sun Dec 27 17:33:57 CET 2020
@end example
@noindent
@@ -1191,6 +1219,7 @@ sends a result back to the client. The server-side
processing
could be:
@example
+@c file eg/network/catpipeserver.awk
BEGIN @{
NetService = "/inet/tcp/8888/0/0"
NetService |& getline # sets $0 and the fields
@@ -1199,6 +1228,7 @@ BEGIN @{
print $0 |& NetService
close(NetService)
@}
+@c endfile
@end example
@noindent
@@ -1211,6 +1241,23 @@ example, you can see how simple it is to open up a
security hole on your
machine. If you allow clients to connect to your machine and
execute arbitrary commands, anyone would be free to do @samp{rm -rf *}.
+The client side connects to port number 8888 on the server side and
+sends the name of the desired file to be sent across the same TCP
+connection. The main loop reads all content coming in from the TCP
+connection line-wise and prints it.
+
+@example
+@c file eg/network/catpipeclient.awk
+BEGIN @{
+ NetService = "/inet/tcp/0/localhost/8888"
+ print "README" |& NetService
+ while ((NetService |& getline) > 0)
+ print $0
+ close(NetService)
+@}
+@c endfile
+@end example
+
@node Email, Web page, Setting Up, Using Networking
@section Reading Email
@cindex RFC 1939
-----------------------------------------------------------------------
Summary of changes:
.../{fingerclient.awk => catpipeclient.awk} | 4 +-
awklib/eg/network/catpipeserver.awk | 8 +
awklib/eg/network/daytimeserver.awk | 4 +
awklib/eg/network/fingerclient.awk | 9 +-
doc/ChangeLog | 5 +
doc/gawkinet.info | 186 +++++++++++++--------
doc/gawkinet.texi | 93 ++++++++---
7 files changed, 207 insertions(+), 102 deletions(-)
copy awklib/eg/network/{fingerclient.awk => catpipeclient.awk} (50%)
create mode 100644 awklib/eg/network/catpipeserver.awk
create mode 100644 awklib/eg/network/daytimeserver.awk
hooks/post-receive
--
gawk
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- [SCM] gawk branch, gawk-5.1-stable, updated. gawk-4.1.0-4189-gce2fcf7,
Arnold Robbins <=