This is receiptfilter.m in view mode; [Download] [Up]
#import <stdio.h>
#import <appkit/appkit.h>
#import <sys/file.h>
#import <syslog.h>
/*
* receiptfilter
* A tool for keeping an eye on read receipts that Mail.app
* automatically generates.
*
* Use:
* Install this program as, say, /usr/local/lib/receiptfilter.
* Start Mail.app.
* In Mail.app's Preferences panel, choose "Expert" and change
* the "Mailer:" field to "/usr/local/lib/receiptfilter".
*
* Now, every time Mail.app automatically tries to send a read receipt
* to someone letting them know that you've just read their message,
* an alert panel will pop up saying
* "Send a receipt to shayman@Objectario.com?"
* and you can say "OK" or "No".
*
* How it Works:
*
* This program is installed as the Mailer for Mail.app, meaning that
* all outgoing mail is handed to this program for delivery. Normally
* your Mailer is "/usr/lib/sendmail". If you change it to this program,
* it will check all the outgoing mail and if it finds a line like
* this
* Subject: Read Receipt
* it will pop up the alert panel. If you answer "No", this program
* merely exits and no receipt is sent.
* If you answer "Yes", or if the original message didn't look like
* a read receipt, the message is given to /usr/lib/sendmail in the
* normal way and off it goes.
*
* Mail.app invokes the mailer program with the recipient or recipients
* on the command line, and the message itself on standard input.
* So this program copies the message from standard in to a temporary
* file, and watches for the "Subject: Read Receipt" line as it
* performs the copy. When it comes time to send the message, this program
* arranges that the temporary file it created is standard input, and then
* executes "/usr/lib/sendmail" with the original argument list, so the
* message is delivered in the normal way.
*
* Downside:
* - this program makes (and later deletes) a copy of every outgoing message
* you send in /tmp, so it will take a tiny bit longer to deliver a
* message, and some disk space will be used during delivery.
* - if your normal Mail.app mailer program is something other than
* /usr/lib/sendmail, you'll have to change this program to invoke
* the correct "real" mailer.
* - it might screw up if your mail message contains a single line longer
* than 1024 characters, but I don't think Mail.app generates lines
* like that.
* - this program checks both the header of the message and the text itself
* for the telltale "Subject: Read Receipt" line. It should just
* check the header, I guess.
*
* Use at your own risk.
*
* Future Enhancements:
*
* I suppose this could be enhanced in a few ways. Make it configurable
* so that certain people (your friends) always get read receipts, others
* never get read receipts, etc etc.
*
* It could install itself nicely. Maybe you run "receiptfilter -install"
* and it would set the Mail.app default automatically, and it would take
* note of what mailer you were previously using rather than assuming
* it was /usr/lib/sendmail.
*
* Maybe a nice GUI for installation etc etc.
*
* Maybe this introductory comment could be shorter than the actual
* source code itself :-)
*
* Comments and suggestions are welcome.
* Steve Hayman
* shayman@Objectario.com
*
*/
/*
* $Version$
* $Log: receiptfilter.m,v $
* Revision 1.1 94/01/06 13:02:54 shayman
* Initial revision
*
* Revision 1.1 94/01/06 13:01:34 shayman
* Initial revision
*
*/
main(argc, argv)
int argc;
char *argv[];
{
char *dest = argv[1];
int scratch;
FILE *f;
char tempfile[] = "/tmp/receiptfilter.XXXXXX";
char linebuf[1024]; // hope for no lines longer than this in the msg
BOOL isReceipt = NO;
/*
* in case we need to report any errors, they'll be sent via
* syslog at priority "daemon.err", and should show up on the console.
*/
openlog("receiptfilter", LOG_CONS|LOG_PID, LOG_DAEMON);
[Application new];
/*
* Copy stdin to a temp file (and make sure it goes away
* when we're through with it); look for the telltale
* "Subject: Read Receipt\n" line.
*/
scratch = mkstemp(tempfile);
unlink(tempfile);
/*
* read lines from stdin; write to temp file.
*/
while ( fgets(linebuf, sizeof(linebuf)-1, stdin) ) {
write(scratch, linebuf, strlen(linebuf));
if ( strcmp(linebuf, "Subject: Read Receipt\n") == 0 )
isReceipt = YES;
}
/*
* Rewind scratch file; close stdin; dup scratch file.
* Effect is that the scratch file is our process's new stdin.
*/
lseek( scratch, 0, L_SET );
close(0);
dup(scratch);
/*
* If this message was a return receipt, give the user a chance
* to confirm whether it should be sent or not.
*/
if ( isReceipt ) {
switch (
NXRunAlertPanel("Read Receipt", "Send a read receipt to %s?",
"OK", "No", NULL,dest) ) {
case NX_ALERTALTERNATE: /* No */
/*
* Exit immediately without calling sendmail.
*/
exit(0);
case NX_ALERTDEFAULT: /* OK */
default:
break;
}
}
/*
* run sendmail, let it pick up our arguments and standard input.
*
* If your *original* Mail.app mailer was something other than
* /usr/lib/sendmail, change this line.
*/
execv( "/usr/lib/sendmail", argv );
/*
* shouldn't get here.
*/
syslog(LOG_ERR, "Couldn't execute /usr/lib/sendmail.");
exit(0);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.