Anonymous Contact Service software v1.1, Part08/08

Dave Mack csu at alembic.acs.com
Mon Jul 16 03:14:56 AEST 1990


This is the second distribution of the Anonymous Contact Service
software. The distribution consists of 8 shar files. This will
(hopefully) be the last full distribution of the system - all
future versions will be distributed as patches. The patchlevel of
this version is 1.

The ACS software provides a mechanism for posting anonymous articles,
for receiving replies to those articles which are also anonymous, and
permits prolonged anonymous conversations in which neither writer knows
the other's actual e-mail address.

This software is currently being used to provide an anonymous personals
service in alt.personals.

Dave Mack
csu at alembic.ACS.COM

#! /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 archive 8 (of 8)."
# Contents:  mailer/headers.c
# Wrapped by csu at alembic on Sun Jul 15 12:46:56 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'mailer/headers.c' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'mailer/headers.c'\"
else
echo shar: Extracting \"'mailer/headers.c'\" \(15935 characters\)
sed "s/^X//" >'mailer/headers.c' <<'END_OF_FILE'
X/*
X**  message spooing, header and address parsing and completion
X**  functions for smail/rmail
X*/
X
X#ifndef lint
Xstatic char 	*sccsid="@(#)headers.c	2.5 (smail) 9/15/87";
X#endif
X
X# include	<stdio.h>
X# include	<sys/types.h>
X# include	<time.h>
X# include	<ctype.h>
X# include	<pwd.h>
X# include	"defs.h"
X
Xextern enum edebug debug;	/* how verbose we are 		*/ 
Xextern char hostname[];		/* */
Xextern char hostdomain[];	/* */
Xextern char *spoolfile;		/* file name of spooled message */
Xextern FILE *spoolfp;		/* file ptr  to spooled message */
Xextern int spoolmaster;		/* set if creator of spoolfile  */
Xextern time_t now;		/* time				*/
Xextern char nows[], arpanows[];	/* time strings			*/
Xextern struct tm *gmt, *loc;	/* time structs			*/
Xextern char *from_addr;		/* replacement fromaddr with -F */
X
Xstatic char toline[SMLBUF];
Xstatic char fromline[SMLBUF];
Xstatic char dateline[SMLBUF];
Xstatic char midline[SMLBUF];
Xstatic char *ieof = "NOTNULL";
X
Xstruct reqheaders {
X	char *name;
X	char *field;
X	char have;
X};
X
Xstatic struct reqheaders reqtab[] = {
X	"Message-Id:"	,	midline		,	'N'	,
X	"Date:"		,	dateline	,	'N'	,
X	"From:"		,	fromline	,	'N'	,
X	"To:"		,	toline		,	'N'	,
X	NULL 		,	NULL		,	'N'
X};
X
X
X/*
X**
X** parse(): parse <address> into <domain, user, form>.
X**
X** 	input		form
X**	-----		----
X**	user		LOCAL
X**	domain!user	DOMAIN
X**	user at domain	DOMAIN
X**	@domain,address	LOCAL	(just for sendmail)
X**	host!address	UUCP
X**
X*/
X
Xenum eform
Xparse(address, domain, user)
Xchar *address;		/* input address 	*/
Xchar *domain;		/* output domain 	*/
Xchar *user;		/* output user 		*/
X{
X	int parts;
X	char *partv[MAXPATH];				/* to crack address */
X
X/*
X**  If this is route address form @domain_a, at domain_b:user at domain_c, ...
X*/
X	if(*address == '@')
X#ifdef SENDMAIL
X/*
X**  hand it to sendmail
X*/
X	{
X		goto local;
X	}
X#else
X/*
X**  no sendmail, convert it into a bang path: domain_a!domain_b!domain_c!user
X*/
X	{
X		char buf[SMLBUF], *p;
X		char t_dom[SMLBUF], t_user[SMLBUF];
X
X		(void) strcpy(buf, address+1);		/* elide leading '@' */
X
X		for(p=buf; *p != '\0' ; p++) {	/* search for ',' or ':' */
X			if(*p == ':') {		/* reached end of route */
X				break;
X			}
X			if(*p == ',') {		/* elide ','s */
X				(void) strcpy(p, p+1);
X			}
X			if(*p == '@') {		/* convert '@' to '!' */
X				*p = '!';
X			}
X		}
X
X		if(*p != ':') {	/* bad syntax - punt */
X			goto local;
X		}
X		*p = '\0';
X
X		if(parse(p+1, t_dom, t_user) != LOCAL) {
X			(void) strcat(buf, "!");
X			(void) strcat(buf, t_dom);
X		}
X		(void) strcat(buf, "!");
X		(void) strcat(buf, t_user);
X
X		/* munge the address (yuk)
X		** it's OK to copy into 'address', because the machinations
X		** above don't increase the string length of the address.
X		*/
X
X		(void) strcpy(address, buf);
X
X		/* re-parse the address */
X		return(parse(address, domain, user));
X	}
X#endif
X/*
X**  Try splitting at @.  If it works, this is user at domain, form DOMAIN.
X**  Prefer the righthand @ in a at b@c.
X*/
X	if ((parts = ssplit(address, '@', partv)) >= 2) {
X		(void) strcpy(domain, partv[parts-1]);
X		(void) strncpy(user, partv[0], partv[parts-1]-partv[0]-1);
X		user[partv[parts-1]-partv[0]-1] = '\0';
X		return (DOMAIN);
X	} 
X/*
X**  Try splitting at !. If it works, see if the piece before the ! has
X**  a . in it (domain!user, form DOMAIN) or not (host!user, form UUCP).
X*/
X	if (ssplit(address, '!', partv) > 1) {
X		(void) strcpy(user, partv[1]);
X		(void) strncpy(domain, partv[0], partv[1]-partv[0]-1);
X		domain[partv[1]-partv[0]-1] = '\0';
X
X		if((parts = ssplit(domain, '.', partv)) < 2) {
X			return(UUCP);
X		}
X
X		if(partv[parts-1][0] == '\0') {
X			partv[parts-1][-1] = '\0'; /* strip trailing . */
X		}
X		return (DOMAIN);
X	}
X/* 
X**  Done trying.  This must be just a user name, form LOCAL.
X*/
Xlocal:
X	(void) strcpy(user, address);
X	(void) strcpy(domain, "");
X	return(LOCAL);				/* user */
X}
X
Xbuild(domain, user, form, result)
Xchar *domain;
Xchar *user;
Xenum eform form;
Xchar *result;
X{
X	switch((int) form) {
X	case LOCAL:
X		(void) sprintf(result, "%s", user); 
X		break;
X	case UUCP:
X		(void) sprintf(result, "%s!%s", domain, user);
X		break;
X	case DOMAIN:
X		(void) sprintf(result, "%s@%s", user, domain);
X		break;
X	}
X}
X
X/*
X**  ssplit(): split a line into array pointers.
X**
X**  Each pointer wordv[i] points to the first character after the i'th 
X**  occurence of c in buf.  Note that each wordv[i] includes wordv[i+1].
X**
X*/
X
Xssplit(buf, c, ptr)
Xregister char *buf;		/* line to split up 		*/
Xchar c;				/* character to split on	*/
Xchar **ptr;			/* the resultant vector		*/
X{
X        int count = 0;
X        int wasword = 0;
X
X        for(; *buf; buf++) {
X		if (!wasword) {
X			count++;
X			*ptr++ = buf;
X		}
X		wasword = (c != *buf);
X        }
X	if (!wasword) {
X		count++;
X		*ptr++ = buf;
X	}
X        *ptr = NULL;
X        return(count);
X}
X
X/*
X** Determine whether an address is a local address
X*/
X
Xislocal(addr, domain, user)
Xchar *addr, *domain, *user;
X{
X		enum eform form, parse();
X		extern char hostuucp[];
X
X		/*
X		** parse the address
X		*/
X
X		form = parse(addr, domain, user);
X
X		if((form == LOCAL)			/* user */
X		||(strcmpic(domain, hostdomain) == 0)	/* user at hostdomain */
X		||(strcmpic(domain, hostname)   == 0)	/* user at hostname */
X#ifdef DOMGATE
X		||(strcmpic(domain, &MYDOM[0]) == 0)	/* user at MYDOM w/ dot */
X		||(strcmpic(domain, &MYDOM[1]) == 0)	/* user at MYDOM no dot */
X#endif
X		||(strcmpic(domain, hostuucp)   == 0)) {/* user at hostuucp */
X			return(1);
X		}
X		return(0);
X}
X
X/*
X** spool - message spooling module
X**
X** (1) get dates for headers, etc.
X** (2) if the message is on the standard input (no '-f')
X**     (a) create a temp file for spooling the message.
X**     (b) collapse the From_ headers into a path.
X**     (c) if the mail originated locally, then
X**	     (i) establish default headers
X**	    (ii) scan the message headers for required header fields
X**	   (iii) add any required message headers that are absent
X**     (d) copy rest of the message to the spool file
X**     (e) close the spool file
X** (3) open the spool file for reading
X*/
X
Xvoid
Xspool(argc, argv)
Xint argc;
Xchar **argv;
X{
X	static char *tmpf = "/tmp/rmXXXXXX";	/* temp file name */
X	char *mktemp();
X	char buf[SMLBUF];
X	static char splbuf[SMLBUF];
X	char from[SMLBUF], domain[SMLBUF], user[SMLBUF];
X	void rline(), scanheaders(), compheaders();
X
X	/*
X	** if the mail has already been spooled by
X	** a previous invocation of smail don't respool.
X	** check the file name to prevent things like
X	** rmail -f /etc/passwd badguy at dreadfuldomain
X	*/
X
X	if((spoolfile != NULL)
X	&& (strncmp(spoolfile, tmpf, strlen(tmpf) - 6) != 0)) {
X		error(EX_TEMPFAIL, "spool: bad file name '%s'\n", spoolfile);
X	}
X
X	/*
X	** set dates in local, arpa, and gmt forms
X	*/
X	setdates();
X
X	/*
X	** If necessary, copy stdin to a temp file.
X	*/
X
X	if(spoolfile == NULL) {
X		spoolfile = strcpy(splbuf, tmpf);
X		(void) mktemp(spoolfile);
X
X		if((spoolfp = fopen(spoolfile, "w")) == NULL) {
X			error(EX_CANTCREAT, "can't create %s.\n", spoolfile);
X		}
X
X		spoolmaster = 1;
X
X		/*
X		** rline reads the standard input,
X		** collapsing the From_ and >From_
X		** lines into a single uucp path.
X		** first non-from_ line is in buf[];
X		*/
X
X		rline(from, buf);
X
X		/*
X		** if the mail originated here, we parse the header
X		** and add any required headers that are missing.
X		*/
X
X		if(islocal(from, domain, user) || (from_addr != NULL)) {
X			/*
X			** initialize default headers
X			*/
X			def_headers(argc, argv, from);
X
X			/*
X			** buf has first, non-from_  line
X			*/
X			scanheaders(buf);
X			/*
X			** buf has first, non-header line,
X			*/
X
X			compheaders();
X
X			if(buf[0] != '\n') {
X				(void) fputs("\n", spoolfp);
X			}
X		}
X
X		/*
X		** now, copy the rest of the letter into the spool file
X		** terminate on either EOF or '^.$'
X		*/
X
X		while(ieof != NULL) {
X			(void) fputs(buf, spoolfp);
X			if((fgets(buf, SMLBUF, stdin) == NULL)
X			|| (buf[0] == '.' && buf[1] == '\n')) {
X				ieof = NULL;
X			}
X		}
X
X		/*
X		** close the spool file, and the standard input.
X		*/
X
X		(void) fclose(spoolfp);
X		(void) fclose(stdin);	/* you don't see this too often! */
X	}
X
X	if((spoolfp = fopen(spoolfile, "r")) == NULL) {
X		error(EX_TEMPFAIL, "can't open %s.\n", spoolfile);
X	}
X}
X
X/*
X**
X**  rline(): collapse From_ and >From_ lines.
X**
X**  Same idea as the old rmail, but also turns user at domain to domain!user. 
X**
X*/
X
Xvoid
Xrline(from, retbuf)
Xchar *from;
Xchar *retbuf;
X{
X	int parts;			/* for cracking From_ lines ... */
X	char *partv[16];		/* ... apart using ssplit() 	*/
X	char user[SMLBUF];		/* for rewriting user at host	*/
X	char domain[SMLBUF];		/* "   "         "          	*/
X	char addr[SMLBUF];		/* "   "         "          	*/
X	enum eform form, parse();	/* "   "         "          	*/
X	extern build();			/* "   "         "          	*/
X	char *c;
X	int nhops, i;
X	char buf[SMLBUF], tmp[SMLBUF], *hop[128], *e, *b;
X	char *pwuid();
X
X	if(spoolmaster == 0) return;
X
X	buf[0] = from[0] = addr[0] = '\0';
X/*
X**  Read each line until we hit EOF or a line not beginning with "From "
X**  or ">From " (called From_ lines), accumulating the new path in from
X**  and stuffing the actual sending user (the user name on the last From_ 
X**  line) in addr.
X*/
X	for(;;) {
X		(void) strcpy(retbuf, buf);
X		if(ieof == NULL) {
X			break;
X		}
X		if((fgets(buf, sizeof(buf), stdin) == NULL)
X		|| (buf[0] == '.' && buf[1] == '\n')) {
X			ieof = NULL;
X			break;
X		}
X		if (strncmp("From ", buf, 5) 
X		    && strncmp(">From ", buf, 6)) {
X			break;
X		}
X/*
X**  Crack the line apart using ssplit.
X*/
X		if(c = index(buf, '\n')) {
X			*c = '\0';
X		}
X		parts = ssplit(buf, ' ', partv);
X/*
X**  Tack host! onto the from argument if "remote from host" is present.
X*/
X
X		if((parts > 3)
X		&& (strncmp("remote from ", partv[parts-3], 12) == 0)) {
X			(void) strcat(from, partv[parts-1]);
X			(void) strcat(from, "!");
X		}
X/*
X**  Stuff user name into addr, overwriting the user name from previous 
X**  From_ lines, since only the last one counts.  Then rewrite user at host 
X**  into host!user, since @'s don't belong in the From_ argument.
X*/
X		if(parts < 2) {
X			break;
X		} else {
X			char *x = partv[1];
X			char *q = index(x, ' ');
X			if(q != NULL) {
X				*q = '\0';
X			}
X			(void) strcpy(addr, x);
X		}
X
X		(void) parse(addr, domain, user);
X		if(*domain == '\0') {
X			form = LOCAL;
X		} else {
X			form = UUCP;
X		}
X
X		build(domain, user, form, addr);
X	}
X/*
X**  Now tack the user name onto the from argument.
X*/
X	(void) strcat(from, addr);
X/*
X**  If we still have no from argument, we have junk headers, but we try
X**  to get the user's name using /etc/passwd.
X*/
X
X	if (from[0] == '\0') {
X		char *login;
X		if ((login = pwuid(getuid())) == NULL) {
X			(void) strcpy(from, "nobody");	/* bad news */
X		} else {
X			(void) strcpy(from, login);
X		}
X	}
X
X	/* split the from line on '!'s */
X	nhops = ssplit(from, '!', hop);
X
X	for(i = 0; i < (nhops - 1); i++) {
X		b = hop[i];
X		if(*b == '\0') {
X			continue;
X		}
X		e = hop[i+1];
X		e-- ;
X		*e = '\0';	/* null terminate each path segment */
X		e++;
X
X#ifdef HIDDENHOSTS
X/*
X**  Strip hidden hosts:  anything.hostname.MYDOM -> hostname.MYDOM
X*/
X		for(p = b;(p = index(p, '.')) != NULL; p++) {
X			if(strcmpic(hostdomain, p+1) == 0) {
X				(void) strcpy(b, hostdomain);
X				break;
X			}
X		}
X#endif
X
X/*
X**  Strip useless MYDOM: hostname.MYDOM -> hostname
X*/
X		if(strcmpic(hop[i], hostdomain) == 0) {
X			(void) strcpy(hop[i], hostname);
X		}
X	}
X
X/*
X**  Now strip out any redundant information in the From_ line
X**  a!b!c!c!d	=> a!b!c!d
X*/
X
X	for(i = 0; i < (nhops - 2); i++) {
X		b = hop[i];
X		e = hop[i+1];
X		if(strcmpic(b, e) == 0) {
X			*b = '\0';
X		}
X	}
X/*
X**  Reconstruct the From_ line
X*/
X	tmp[0] = '\0';			/* empty the tmp buffer */
X
X	for(i = 0; i < (nhops - 1); i++) {
X		if((hop[i][0] == '\0')	/* deleted this hop */
X		 ||((tmp[0] == '\0')	/* first hop == hostname */
X		  &&(strcmpic(hop[i], hostname) == 0))) {
X			continue;
X		}
X		(void) strcat(tmp, hop[i]);
X		(void) strcat(tmp, "!");
X	}
X	(void) strcat(tmp, hop[i]);
X	(void) strcpy(from, tmp);
X	(void) strcpy(retbuf, buf);
X	(void) fprintf(spoolfp, "%s\n", from);
X}
X
Xvoid
Xscanheaders(buf)
Xchar *buf;
X{
X	int inheader = 0;
X
X	while(ieof != NULL) {
X		if(buf[0] == '\n') {
X			break; /* end of headers */
X		}
X
X		/*
X		** header lines which begin with whitespace
X		** are continuation lines
X		*/
X		if((inheader == 0)
X		|| ((buf[0] != ' ' && buf[0] != '\t'))) {
X			/* not a continuation line
X			** check for header
X			*/
X			if(isheader(buf) == 0) {
X				/*
X				** not a header
X				*/
X				break;
X			}
X			inheader = 1;
X			haveheaders(buf);
X		}
X		(void) fputs(buf, spoolfp);
X		if((fgets(buf, SMLBUF, stdin) == NULL)
X		|| (buf[0] == '.' && buf[1] == '\n')) {
X			ieof = NULL;
X		}
X	}
X
X	if(isheader(buf)) {
X		buf[0] = '\0';
X	}
X}
X
X/*
X** complete headers - add any required headers that are not in the message
X*/
Xvoid
Xcompheaders()
X{
X	struct reqheaders *i;
X
X	/*
X	** look at the table of required headers and
X	** add those that are missing to the spooled message.
X	*/
X	for(i = reqtab; i->name != NULL; i++) {
X		if(i->have != 'Y') {
X			(void) fprintf(spoolfp, "%s\n", i->field);
X		}
X	}
X}
X
X/*
X** look at a string and determine
X** whether or not it is a valid header.
X*/
Xisheader(s)
Xchar *s;
X{
X	char *p;
X
X	/*
X	** header field names must terminate with a colon
X	** and may not be null.
X	*/
X	if(((p = index(s, ':')) == NULL) || (s == p)) {
X		return(0);
X
X	}
X	/*
X	** header field names must consist entirely of
X	** printable ascii characters.
X	*/
X	while(s != p) {
X		if((*s < '!') || (*s > '~')) {
X			return(0);
X		}
X		s++;
X	}
X	/*
X	** we hit the ':', so the field may be a header
X	*/
X	return(1);
X}
X
X/*
X** compare the header field to those in the required header table.
X** if it matches, then mark the required header as being present
X** in the message.
X*/
Xhaveheaders(s)
Xchar *s;
X{
X	struct reqheaders *i;
X
X	for(i = reqtab; i->name != NULL; i++) {
X		if(strncmpic(i->name, s, strlen(i->name)) == 0) {
X			if((strncmpic("From:", s, 5) == 0)
X			&& (from_addr != NULL)) {
X				(void) sprintf(s, "From: %s\n", from_addr);
X			}
X			i->have = 'Y';
X			break;
X		}
X	}
X}
X
X/*
X** create default headers for the message.
X*/
Xdef_headers(argc, argv, from)
Xint argc;
Xchar **argv;
Xchar *from;
X{
X	def_to(argc, argv);	/* default To:		*/
X	def_date();		/* default Date:	*/
X	def_from(from);		/* default From: 	*/
X	def_mid();		/* default Message-Id:	*/
X}
X
X/*
X** default Date: in arpa format
X*/
Xdef_date()
X{
X	(void) strcpy(dateline, "Date: ");
X	(void) strcat(dateline, arpanows);
X}
X
X/*
X** default Message-Id
X**  Message-Id: <yymmddhhmm.AAppppp at hostdomain>
X**
X**	yy	 year
X**	mm	 month
X**	dd	 day
X**	hh	 hour
X**	mm	 minute
X**	ppppp	process-id
X**
X** date and time are set by GMT
X*/
Xdef_mid()
X{
X	(void) sprintf(midline, "Message-Id: <%02d%02d%02d%02d%02d.AA%05d@%s>",
X		gmt->tm_year,
X		gmt->tm_mon+1,
X		gmt->tm_mday,
X		gmt->tm_hour,
X		gmt->tm_min,
X		getpid(),
X		hostdomain);
X}
X
X/*
X** default From:
X**  From: user at hostdomain (Full Name)
X*/
Xdef_from(from)
Xchar *from;
X{
X
X	char *nameptr;
X	char name[SMLBUF];
X	char *getenv(), *login;
X	char *pwfnam(), *pwuid();
X
X	if (from_addr != NULL) {
X		(void) sprintf(fromline, "From: %s", from_addr);
X		return;
X	}
X
X	name[0] = '\0';
X	if((nameptr = getenv("NAME")) != NULL) {
X		(void) strcpy(name, nameptr);
X	} else if((login = pwuid(getuid())) != NULL) {
X		if((nameptr = pwfnam(login)) != NULL) {
X			(void) strcpy(name, nameptr);
X		}
X	}
X	if(name[0] != '\0') {
X		(void) sprintf(fromline,
X			"From: %s@%s (%s)", from, hostdomain, name);
X	} else {
X		(void) sprintf(fromline,
X			"From: %s@%s", from, hostdomain);
X	}
X}
X
X/*
X** default To:
X**  To: recip1, recip2, ...
X**
X** lines longer than 50 chars are continued on another line.
X*/
Xdef_to(argc, argv)
Xint argc;
Xchar **argv;
X{
X	int i, n;
X	char *bol;
X
X	bol = toline;
X	(void) strcpy(bol, "To: ");
X	for(n = i = 0; i < argc; i++) {
X		(void) strcat(bol, argv[i]);
X
X		if((index(argv[i], '!') == NULL)
X		&& (index(argv[i], '@') == NULL)) {
X			(void) strcat(bol, "@");
X			(void) strcat(bol, hostdomain);
X		}
X		if(i+1 < argc) {
X			n = strlen(bol);
X			if(n > 50) {
X				(void) strcat(bol, ",\n\t");
X				bol = bol + strlen(bol);
X				*bol = '\0';
X				n = 8;
X			} else {
X				(void) strcat(bol, ", ");
X			}
X		}
X	}
X}
END_OF_FILE
if test 15935 -ne `wc -c <'mailer/headers.c'`; then
    echo shar: \"'mailer/headers.c'\" unpacked with wrong size!
fi
# end of 'mailer/headers.c'
fi
echo shar: End of archive 8 \(of 8\).
cp /dev/null ark8isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 ; do
    if test ! -f ark${I}isdone ; then
	MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 8 archives.
    rm -f ark[1-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0



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