cgw@vaxb.acs.unt.edu (06/28/91)
well, here it is, finally. this is a shar file of a document that contains yet another shar file, which is the actual program `plan'. there is a partial description of what plan does in the file that contains the shar file, and you can probably get something working by reading that. essentially, what plan does is create a FIFO queue and watch it for accesses. the queue is named .plan, so whenever anyone fingers you, the program that you specify on the commandline when you execute plan will be run. note: I WILL NOT SUPPORT THIS PROGRAM. (i didn't write it, why should i?) when i get done fixing my companion program to plan, called `fingerer', i'll post it. (unix/C programmer advice #247: don't develop code on a sequent running DYNIX. if you have to, be sure you're GOOD, and try not to use cc. use gcc. (please don't flame me, it's just an opinion)) (yes, this does mean i'm a little wary about posting My Own Source Code to the net for All to See. please don't flame fingerer when i post it, either :-) ) what fingerer does (just in case you don't feel like waiting around for me to post mine): it does a ps and greps for "finger". if it doesn't find anyone running finger, it does a netstat -n to look for connections on port 79. the current version of what fingerer does can be examined by fingering cgw@ponder.csci.unt.edu. also, any information fingerer finds is logged to a file (yes, i have a very large file of all the people who've fingered me since i posted! :-)) well, that's enough information. have fun with it! -cgw- #! /bin/sh # This is a shell archive, meaning: # 1. Remove everything above the #! /bin/sh line. # 2. Save the resulting text in a file. # 3. Execute the file with /bin/sh (not csh) to create the files: # plan.prog # This archive created: Wed Jun 26 11:49:44 1991 export PATH; PATH=/bin:$PATH if test -f 'plan.prog' then echo shar: will not over-write existing file "'plan.prog'" else cat << \SHAR_EOF > 'plan.prog' Return-path: <armstron@cs.arizona.edu> Received: from optima.cs.arizona.edu by vaxb.acs.unt.edu with PMDF#10363; Thu, 11 Apr 1991 16:10 CST Received: from caslon.cs.arizona.edu by optima.cs.arizona.edu (4.1/15) id AA23217; Thu, 11 Apr 91 14:09:13 MST Received: by caslon.cs.arizona.edu; Thu, 11 Apr 91 14:09:11 -0700 Date: Thu, 11 Apr 91 14:09:10 MST From: Jim Armstrong <armstron@cs.arizona.edu> Subject: RE: fingeree ... In-reply-to: <9482C88780002EE8@vaxb.acs.unt.edu>; from "christopher williams" at Apr 11, 91 2:46 pm To: CGW@vaxb.acs.unt.edu (christopher williams) Message-id: <9104112109.AA29387@caslon.cs.arizona.edu> X-Envelope-to: CGW X-Mailer: ELM [version 2.3 PL8] > >About a month ago there was a sample program posted to this newsgroup that > >set up a FIFO named pipe as your .plan file. I modified the code to set up > >a simple (perhaps naive) finger monitor for users on my machine. The process > do you still have the source for it? would you send it to me? Here is the article which appeared in comp.unix.questions a while back. It contains generic code that will run any program you want whenever a certain file is accessed (i.e. the .plan file in this case). All you have to do is compile it (it creates an executable called 'plan') and then to get it running say 'plan a.out &' where a.out is some program you have written. I don't have my program any more, but basically what I did was a ps au within that program. It used egrep to search for someone currently fingering me and appended the output to a file. To get really fancy you could then read from that file to find out exactly who it is (all in the same program) and print out a nice personal message to whoever is fingering you as part of what looks to be your .plan file. A couple of things to watch out for: If the finger is remote, the ps au won't find anything. Also, if two people finger you at the same time you may run into trouble, but I didn't try experimenting with this too much. I also found it helpful to timestamp a date to the file, too (I used localtime() for efficiency). This makes it easier to look back later at the file and see who's been fingering you and when while you were not logged on. It also helpful in debugging your program. So set up this code and experiment with different programs. Just be creative and see what else you can do with it. One idea I used for a while is making it print a different quote each time. The possibilites are endless. Enjoy. Jim Article 31270 of comp.unix.questions: Path: arizona!arizona.edu!cerritos.edu!usc!sdd.hp.com!wuarchive!uunet!unisoft!rembo From: rembo@unisoft.UUCP (Tony Rems) Newsgroups: comp.unix.questions Subject: Re: Finger Message-ID: <3391@unisoft.UUCP> Date: 22 Feb 91 02:44:17 GMT References: <37675@netnews.upenn.edu> Reply-To: rembo@unisoft.UUCP (Tony Rems) Organization: UniSoft Corporation -- UNIX R Us. Lines: 254 In article <37675@netnews.upenn.edu> minzhi@eniac.seas.upenn.edu (Min-Zhi Shao) writes: > > When I fingered our system administrator, I got the following result: > >_________________________________________________________________________ >Login name: gardella In real life: Ed Gardella [CETS] >Directory: /home/cets/gardella Shell: /usr/local/bin/bash >On since Feb 15 19:49:04 on ttyp1 from TSTEST.SEAS.UPEN >14 minutes Idle Time >No unread mail >Project: System Administrator eniac.seas.upenn.edu >Plan: > Meander about until something interesting comes along. > >Office: 154 Moore Building Work Phone: 898-2491 > Home Phone: 387-4104 > >I have been fingered 3 times today >_________________________________________________________________________ > >the .plan file in his home directory looks like: > >prw-r--r-- 1 gardella 0 Feb 15 23:48 /home/cets/gardella/.plan >^ As you have found out by now, I'm sure, the p means that this is a named pipe aka a FIFO. If you'd like to do this yourself, here is a little program I wrote to do it (see the comments at the the beginning of the plan.c file for usage info): Here's the shar of my plan program, just cut up until it says "cut here", and then type 'sh filename' using whatever filename you save it as. If you use 'plan' it will get overwritten. The code here should compile w/o any problems on any BSD machine, I have tried it on a Sun, Vax 750, and Pyramid 90x. It should also work properly on any SVR4.0 machine. The code is pretty heavily commented so it should be self explanatory. Note that you should put a -DFILENAME="your_home_dir/.plan" to get it to put your path in, or you can just edit the source and change the value of FILENAME permanently. If you have any problems getting it compiled, just send me mail. Enjoy. -Tony -------------------------cut-here------------------------------------ #! /bin/sh # This is a shell archive. Remove anything before this line, then unpack # it by saving it into a file and typing "sh file". To overwrite existing # files, type "sh file -c". You can also feed this as standard input via # unshar, or by typing "sh <file", e.g.. If this archive is complete, you # will see the following message at the end: # "End of shell archive." # Contents: Makefile plan.c # Wrapped by rembo@unisoft on Mon Oct 8 10:22:34 1990 PATH=/bin:/usr/bin:/usr/ucb ; export PATH if test -f 'Makefile' -a "${1}" != "-c" ; then echo shar: Will not clobber existing file \"'Makefile'\" else echo shar: Extracting \"'Makefile'\" \(1408 characters\) sed "s/^X//" >'Makefile' <<'END_OF_FILE' DEST = /users/eng/rembo/.unisoftbin X XEXTHDRS = /usr/include/fcntl.h \ X /usr/include/signal.h \ X /usr/include/stdio.h \ X /usr/include/sys/fcntl.h \ X /usr/include/sys/file.h \ X /usr/include/sys/stat.h \ X /usr/include/sys/sysmacros.h \ X /usr/include/sys/sysmacros.h \ X /usr/include/sys/types.h \ X /usr/include/sys/types.h X HDRS = X LDFLAGS = X LIBS = X LINKER = cc X MAKEFILE = Makefile X OBJS = plan.o X PRINT = pr X PROGRAM = plan X SRCS = plan.c X all: $(PROGRAM) X X$(PROGRAM): $(OBJS) $(LIBS) X @echo -n "Loading $(PROGRAM) ... " X @$(LINKER) $(LDFLAGS) $(OBJS) $(LIBS) -o $(PROGRAM) X @echo "done" X clean:; @rm -f $(OBJS) X depend:; @mkmf -f $(MAKEFILE) PROGRAM=$(PROGRAM) DEST=$(DEST) X index:; @ctags -wx $(HDRS) $(SRCS) X install: $(PROGRAM) X @echo Installing $(PROGRAM) in $(DEST) X @install -s $(PROGRAM) $(DEST) X print:; @$(PRINT) $(HDRS) $(SRCS) X program: $(PROGRAM) X tags: $(HDRS) $(SRCS); @ctags $(HDRS) $(SRCS) X update: $(DEST)/$(PROGRAM) X X$(DEST)/$(PROGRAM): $(SRCS) $(LIBS) $(HDRS) $(EXTHDRS) X @make -f $(MAKEFILE) DEST=$(DEST) install X### plan.o: /usr/include/sys/types.h /usr/include/sys/sysmacros.h \ X /usr/include/sys/sysmacros.h /usr/include/sys/file.h \ X /usr/include/sys/fcntl.h /usr/include/sys/types.h \ X /usr/include/fcntl.h /usr/include/stdio.h /usr/include/sys/stat.h \ X /usr/include/signal.h END_OF_FILE if test 1408 -ne `wc -c <'Makefile'`; then echo shar: \"'Makefile'\" unpacked with wrong size! fi # end of 'Makefile' fi if test -f 'plan.c' -a "${1}" != "-c" ; then echo shar: Will not clobber existing file \"'plan.c'\" else echo shar: Extracting \"'plan.c'\" \(2197 characters\) sed "s/^X//" >'plan.c' <<'END_OF_FILE' X X/* THIS IS THE UNPUBLISHED SOURCE CODE OF REMBO */ X/* The copyright notice above does not evidence any */ X/* actual or intended publication of such source code. */ X/* So, use it if you like, but give me credit. */ X X X/* Usage: plan program_name */ X X X/* Description: */ X X/* This program takes the full pathname of an */ X/* executable and runs it on a fifo in the */ X/* user's home directory named .plan. This */ X/* way, when finger is executed, the output */ X/* of the program goes to the fifo. */ X X/* Written by: Tony Rems */ X X/* Send bugs and flames to /dev/null or */ X/* rembo@unisoft.com */ X X#include <sys/types.h> X#include <sys/file.h> X#include <stdio.h> X#include <fcntl.h> X#include <sys/stat.h> X#include <signal.h> X X/* Defines */ X#define FILENAME "/users/eng/rembo/.plan" X#define PERMS 0666 X#define USAGE "%s program_name\n" X X/* Function prototypes */ void sig_handler(); X main (argc, argv) int argc; char *argv[]; X{ X int fd; X int pid; X int status; X X if ( argc !=2 ) { X fprintf (stderr, USAGE, argv[0]); X exit(1); X } /* if */ X X/* Catch interrupts for cleanup */ X signal(SIGTERM, sig_handler); X signal(SIGINT, sig_handler); X signal(SIGHUP, sig_handler); X X unlink (FILENAME); X X/* Make the fifo */ X if ((mknod(FILENAME, S_IFIFO | PERMS, 0)) < 0 ) { X perror("mknod"); X exit(2); X } /* if */ X X while (1) { X if ((fd = open(FILENAME, O_WRONLY)) < 0 ) { X perror("open"); X exit(3); X } /* if */ X X/* Once our open completes we know that someone else has X * opened the FIFO for reading, so we can know run our X * program on it. So, we fork, exec our program and X * wait for the child to complete. X */ X switch (pid = fork()) { X case -1: X perror("fork"); X exit(4); X break; X case 0: X/* If we're in the child, we copy our fifo to stdout */ X/* and exec the program given */ X dup2(fd, 1); X execlp(argv[1],argv[1],(void *)NULL); X perror("child returned"); X exit(5); X break; X default: X/* If we're in the parent, we close the pipe and wait */ X close(fd); X while (wait(&status) != pid) X ; X break; X } /* switch */ X sleep(2); X close(fd); X } /* while */ X} /* main */ X void sig_handler() /* cleanup */ X{ X unlink(FILENAME); X exit(0); X} END_OF_FILE if test 2197 -ne `wc -c <'plan.c'`; then echo shar: \"'plan.c'\" unpacked with wrong size! fi # end of 'plan.c' fi echo shar: End of shell archive. exit 0 SHAR_EOF fi # end of overwriting check # End of shell archive exit 0 -- ------------------------------------------------------------------------------- christopher williams, `gilligan', `dude', cgw@vaxb.acs.unt.edu, +1 817 565 4161 lead programmer/operator, the university of north texas, home of the _VaxCave_! `help stamp out and abolish redundancy!' my other .sig is boring too.