/*
 * This software is Copyright (c) 1986 by Rick Adams.
 *
 * Permission is hereby granted to copy, reproduce, redistribute or
 * otherwise use this software as long as: there is no monetary
 * profit gained specifically from the use or reproduction or this
 * software, it is not sold, rented, traded or otherwise marketed, and
 * this copyright notice is included prominently in any copy
 * made.
 *
 * The author make no claims as to the fitness or correctness of
 * this software for any use whatsoever, and it is provided as is. 
 * Any use of this software is at the user's own risk.
 *
 * This function initializes all the strings used for the various
 * filenames.  They cannot be compiled into the program, since that
 * would be non-portable.  With this convention, the netnews sub-system
 * can be owned by any non-privileged user.  It is also possible
 * to work when the administration randomly moves users from one
 * filesystem to another.  The convention is that a particular user
 * (HOME, see Makefile) is searched for in /etc/passwd and all files
 * are presumed relative to there.  This method also allows one copy
 * of the object code to be used on ANY machine.  (this code runs
 * un-modified on 50+ machines at IH!!)
 *
 * The disadvantage to using this method is that all netnews programs
 * (inews, readnews, rnews, checknews) must first search /etc/passwd
 * before they can start up.  This can cause significant overhead if
 * you have a big password file.
 *
 * Some games are played with ifdefs to get four .o files out of this
 * one source file.  INEW is defined for inews, READ for readnews,
 * CHKN for checknews, and EXP for expire.
 */

#ifdef SCCSID
static char	*SccsId = "@(#)pathinit.c	1.17	1/17/86";
#endif /* SCCSID */

#if defined(INEW) || defined(EXP)
#include	"iparams.h"
#endif /* INEW || EXP */

#ifdef READ
#include	"rparams.h"
#endif /* READ */

#if defined(CHKN)
#include "params.h"
#endif /* CHKN */


char *FULLSYSNAME, *SPOOL, *LIB, *BIN, *ACTIVE, *SUBFILE, *ARTFILE,
	*username, *userhome;

#ifdef INEW
char *LOCKFILE, *SEQFILE, *ARTICLE, *INFILE, *TELLME;
#endif /* INEW */

#if defined(INEW) || defined(READ)
char *ALIASES;
#endif /* INEW || READ */

#ifdef EXP
char *OLDNEWS;
#endif /* EXP */

#ifdef READ
char *MAILPARSER;
#endif /* READ */

#ifdef HIDDENNET
char *LOCALSYSNAME;
#endif /* HIDDENNET */


struct passwd *getpwnam();
char *rindex();

#define Sprintf(where,fmt,arg)	(void) sprintf(bfr,fmt,arg); where = AllocCpy(bfr)

char *
AllocCpy(cp)
register char *cp;
{
	register char *mp;
	char *malloc();

	mp = malloc((unsigned)strlen(cp) + 1);

	if (mp == NULL)
		xerror("malloc failed on %s",cp);

	(void) strcpy(mp, cp);
	return mp;
}

pathinit()
{
#if defined(INEW) && defined(NOTIFY)
	FILE	*nfd;		/* notify file descriptor		*/
	char *p;
#endif /* INEW && NOTIFY */
#ifndef ROOTID
	struct passwd	*pw;	/* struct for pw lookup			*/
#endif /* !ROOTID */
#ifdef EXP
	char *p;
#endif /* EXP */
#ifndef CHKN
	struct utsname ubuf;

	uname(&ubuf);
#ifdef HIDDENNET
	FULLSYSNAME = AllocCpy(HIDDENNET);
	LOCALSYSNAME = AllocCpy(ubuf.nodename);
#else /* !HIDDENNET */
	FULLSYSNAME = AllocCpy(ubuf.nodename);
#endif /* !HIDDENNET */
#endif /* !CHKN */

#ifdef HOME
	/* Relative to the home directory of user HOME */
	(void) sprintf(bfr, "%s/%s", logdir(HOME), SPOOLDIR);
	SPOOL = AllocCpy(bfr);
	(void) sprintf(bfr, "%s/%s", logdir(HOME), LIBDIR);
	LIB = AllocCpy(bfr);
#else /* !HOME */
	/* Fixed paths defined in Makefile */
	SPOOL = AllocCpy(SPOOLDIR);
	LIB = AllocCpy(LIBDIR);
#endif /* !HOME */

#ifdef IHCC
	(void) sprintf(bfr, "%s/%s", logdir(HOME), BINDIR);
	BIN = AllocCpy(bfr);
#else /* !IHCC */
	Sprintf(BIN, "%s", BINDIR);
#endif /* !IHCC */

	Sprintf(ACTIVE, "%s/active", LIB);

#ifdef EXP
	(void) strcpy(bfr, SPOOL);
	p = rindex(bfr, '/');
	if (p) {
		strcpy(++p, "oldnews");
		OLDNEWS = AllocCpy(bfr);
	} else
		OLDNEWS = AllocCpy("oldnews");
#endif /* EXP */

#ifndef CHKN
	Sprintf(SUBFILE, "%s/sys", LIB);
	Sprintf(ARTFILE, "%s/history", LIB);
# endif /* !CHKN */

# ifdef READ
#ifdef SENDMAIL
	Sprintf(MAILPARSER, "%s -oi -oem", SENDMAIL);
#else /* !SENDMAIL */
	Sprintf(MAILPARSER, "%s/recmail", LIB);
#endif /* !SENDMAIL */
# endif /* READ */

# if defined(READ) || defined(INEW)
	Sprintf(ALIASES, "%s/aliases", LIB);
# endif /* READ || INEW */
# ifdef INEW
	Sprintf(LOCKFILE, "%s/LOCK", LIB);
	Sprintf(SEQFILE, "%s/seq", LIB);
	Sprintf(ARTICLE, "%s/.arXXXXXX", SPOOL);
	Sprintf(INFILE, "%s/.inXXXXXX", SPOOL);
/*
 * The person notified by the netnews sub-system.  Again, no name is
 * compiled in, but instead the information is taken from a file.
 * If the file does not exist, a "default" person will get the mail.
 * If the file exists, but is empty, nobody will get the mail.  This
 * may seem backwards, but is a better fail-safe.
 */
# ifdef NOTIFY
	(void) sprintf(bfr, "%s/notify", LIB);
	nfd = fopen(bfr, "r");
	if (nfd != NULL) {
		bfr[0] = '\0';
		(void) fgets(bfr, BUFLEN, nfd);
		if ((p = index(bfr, '\n')) != NULL)	/* strip newline */
			*p = '\0';
		TELLME = AllocCpy(bfr);
		(void) fclose(nfd);
	} else
		TELLME = AllocCpy(NOTIFY);
# endif /* NOTIFY */

/*
 * Since the netnews owner's id number is different on different
 * systems, we'll extract it from the /etc/passwd file.  If no entry,
 * default to root.  This id number seems to only be used to control who
 * can input certain control messages or cancel any message.  Note that
 * entry is the name from the "notify" file as found above if possible.
 * Defining ROOTID in defs.h hardwires in a number and avoids
 * another search of /etc/passwd.
 */
# ifndef ROOTID
	if ((pw = getpwnam(TELLME)) != NULL)
		ROOTID =  pw->pw_uid;
	else if ((pw = getpwnam(HOME)) != NULL)
		ROOTID =  pw->pw_uid;
	else
		ROOTID = 0;		/* nobody left, let only root */
# endif /* !ROOTID */
#endif /* INEW */
}