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static char rcsid[] = "@(#)$Id: bouncebk.c,v 5.1 1992/10/03 22:58:40 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 5.1 $ $State: Exp $
*
* Copyright (c) 1988-1992 USENET Community Trust
* Copyright (c) 1986,1987 Dave Taylor
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: bouncebk.c,v $
* Revision 5.1 1992/10/03 22:58:40 syd
* Initial checkin as of 2.4 Release at PL0
*
*
******************************************************************************/
/** This set of routines implement the bounceback feature of the mailer.
This feature allows mail greater than 'n' hops away (n specified by
the user) to have a 'cc' to the user through the remote machine.
Due to the vagaries of the Internet addressing (uucp -> internet -> uucp)
this will NOT generate bounceback copies with mail to an internet host!
**/
#include "headers.h"
char *bounce_off_remote(), /* forward declaration */
*strcat(), *strcpy();
int
uucp_hops(to)
register char *to;
{
/** Given the entire "To:" list, return the number of hops in the
first address (a hop = a '!') or ZERO iff the address is to a
non uucp address.
**/
register int hopcount = 0, len;
while (*to) {
len = len_next_part(to);
if (len == 1) {
if (whitespace(*to))
break;
if (*to == '!')
hopcount++;
else if (*to == '@' || *to == '%' || *to == ':')
return(0); /* don't continue! */
}
to += len;
}
return(hopcount);
}
char *bounce_off_remote(to)
register char *to;
{
/** Return an address suitable for framing (no, that's not it...)
Er, suitable for including in a 'cc' line so that it ends up
with the bounceback address. The method is to take the first
address in the To: entry and break it into machines, then
build a message up from that. For example, consider the
following address:
a!b!c!d!e!joe
the bounceback address would be;
a!b!c!d!e!d!c!b!a!ourmachine!ourname
simple, eh?
**/
static char address[LONG_STRING]; /* BEEG address buffer! */
char host[MAX_HOPS][NLEN]; /* for breaking up addr */
register int hostcount = 0, hindex = 0, iindex, len;
while (*to) {
len = len_next_part(to);
if (len == 1) {
if (whitespace(*to))
break;
if (*to == '!') {
host[hostcount][hindex] = '\0';
hostcount++;
hindex = 0;
} else
host[hostcount][hindex++] = *to++;
} else {
while (--len >= 0)
host[hostcount][hindex++] = *to++;
}
}
/* we have hostcount hosts... */
strcpy(address, host[0]); /* initialize it! */
for (iindex=1; iindex < hostcount; iindex++) {
strcat(address, "!");
strcat(address, host[iindex]);
}
/* and now the same thing backwards... */
for (iindex = hostcount -2; iindex > -1; iindex--) {
strcat(address, "!");
strcat(address, host[iindex]);
}
/* and finally, let's tack on our machine and login name */
strcat(address, "!");
strcat(address, hostname);
strcat(address, "!");
strcat(address, username);
/* and we're done!! */
return( (char *) address );
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.