alias.c

操作系统SunOS 4.1.3版本的源码

			dbmclose();
			sleep(30);
# ifdef NDBM
			dbminit(aliasfile);
# endif NDBM
		}
	}
	else
		atcnt = 1;

	/*
	**  See if the DBM version of the file is out of date with
	**  the text version.  If so, go into 'init' mode automatically.
	**	This only happens if our effective userid owns the DBM
	**	version or if the mode of the database is 666 -- this
	**	is an attempt to avoid protection problems.  Note the
	**	unpalatable hack to see if the stat succeeded.
	*/

	modtime = stb.st_mtime;
	(void) strcpy(buf, aliasfile);
	(void) strcat(buf, ".pag");
	stb.st_ino = 0;
	if (!init && (stat(buf, &stb) < 0 || stb.st_mtime < modtime || atcnt < 0))
	{
		errno = 0;
		if (AutoRebuild && stb.st_ino != 0 &&
		    ((stb.st_mode & 0777) == 0666 || stb.st_uid == geteuid()))
		{
			init = TRUE;
			automatic = TRUE;
			message(Arpa_Info, "rebuilding alias database");
#ifdef LOG
			if (LogLevel >= 7)
				syslog(LOG_INFO, "rebuilding alias database");
#endif LOG
		}
		else
		{
#ifdef LOG
			if (LogLevel >= 7)
				syslog(LOG_INFO, "alias database out of date");
#endif LOG
			message(Arpa_Info, "Warning: alias database out of date");
		}
	}


	/*
	**  If necessary, load the DBM file.
	**	If running without DBM, load the symbol table.
	*/

	if (init)
	{
#ifdef LOG
		if (LogLevel >= 6)
		{
			extern char *username();

			syslog(LOG_NOTICE, "alias database %srebuilt by %s",
				automatic ? "auto" : "", username());
		}
#endif LOG
		readaliases(aliasfile, TRUE, modtime);
	}
# else DBM
	readaliases(aliasfile, init, modtime);
# endif DBM
}
/*
**  READALIASES -- read and process the alias file.
**
**	This routine implements the part of initaliases that occurs
**	when we are not going to use the DBM stuff.
**
**	Parameters:
**		aliasfile -- the pathname of the alias file master.
**		init -- if set, initialize the DBM stuff.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Reads aliasfile into the symbol table.
**		Optionally, builds the .dir & .pag files.
*/

static
readaliases(aliasfile, init, modtime)
	char *aliasfile;
	bool init;
	time_t modtime;
{
	register char *p;
	char *rhs;
	bool skipping;
	int naliases, bytes, longest;
	FILE *af;
	void (*oldsigint)();
	ADDRESS al, bl;
	register STAB *s;
	char line[BUFSIZ];

	if ((af = fopen(aliasfile, "r")) == NULL)
	{
# ifdef DEBUG
		if (tTd(27, 1))
			printf("Can't open %s\n", aliasfile);
# endif
		errno = 0;
		NoAlias++;
		return;
	}

# ifdef DBM
	/* see if someone else is rebuilding the alias file already */
	if (flock(fileno(af), LOCK_EX | LOCK_NB) < 0 && errno == EWOULDBLOCK)
	{
		/* yes, they are -- wait until done and then return */
		message(Arpa_Info, "Alias file is already being rebuilt");
		if (OpMode != MD_INITALIAS)
		{
			/* wait for other rebuild to complete */
			(void) flock(fileno(af), LOCK_EX);
		}
		(void) fclose(af);
		errno = 0;
		return;
	}
# endif DBM

	/*
	**  If initializing, create the new DBM files, then reopen them
	**  in case they did not previously exist.
	*/

	if (init)
	{
		oldsigint = signal(SIGINT, SIG_IGN);
		(void) strcpy(line, aliasfile);
		(void) strcat(line, ".dir");
		if (close(creat(line, DBMMODE)) < 0)
		{
			syserr("cannot make %s", line);
			(void) signal(SIGINT, oldsigint);
			return;
		}
		(void) strcpy(line, aliasfile);
		(void) strcat(line, ".pag");
		if (close(creat(line, DBMMODE)) < 0)
		{
			syserr("cannot make %s", line);
			(void) signal(SIGINT, oldsigint);
			return;
		}
		if (dbminit(aliasfile)<0)
		{
			syserr("cannot open database %s",aliasfile);
			(void) signal(SIGINT, oldsigint);
			return;
		}
	}

	/*
	**  Read and interpret lines
	*/

	FileName = aliasfile;
	LineNumber = 0;
	naliases = bytes = longest = 0;
	skipping = FALSE;
	while (fgets(line, sizeof (line), af) != NULL)
	{
		int lhssize, rhssize;

		LineNumber++;
		p = index(line, '\n');
		if (p != NULL)
			*p = '\0';
		switch (line[0])
		{
		  case '#':
		  case '\0':
			skipping = FALSE;
			continue;

		  case ' ':
		  case '\t':
			if (!skipping)
				syserr("Non-continuation line starts with space");
			skipping = TRUE;
			continue;
		}
		skipping = FALSE;

		/*
		**  Process the LHS
		**	Find the final colon, and parse the address.
		**	It should resolve to a local name -- this will
		**	be checked later (we want to optionally do
		**	parsing of the RHS first to maximize error
		**	detection).
		*/

		for (p = line; *p != '\0' && *p != ':' && *p != '\n'; p++)
			continue;
		if (*p++ != ':')
		{
			syserr("missing colon");
			continue;
		}
		if (parseaddr(line, &al, 0, ':') == NULL)
		{
			syserr("illegal alias name");
			continue;
		}
		loweraddr(&al);

		/*
		**  Process the RHS.
		**	'al' is the internal form of the LHS address.
		**	'p' points to the text of the RHS.
		*/

		rhs = p;
		for (;;)
		{
			register char c;

			if (init && CheckAliases)
			{
				/* do parsing & compression of addresses */
				while (*p != '\0')
				{
					extern char *DelimChar;

					while (isspace(*p) || *p == ',')
						p++;
					if (*p == '\0')
						break;
					if (parseaddr(p, &bl, -1, ',') == NULL)
						usrerr("%s... bad address", p);
					p = DelimChar;
				}
			}
			else
			{
				p = &p[strlen(p)];
				if (p[-1] == '\n')
					*--p = '\0';
			}

			/* see if there should be a continuation line */
			c = fgetc(af);
			if (!feof(af))
				(void) ungetc(c, af);
			if (c != ' ' && c != '\t')
				break;

			/* read continuation line */
			if (fgets(p, sizeof line - (p - line), af) == NULL)
				break;
			LineNumber++;
		}
		if (al.q_mailer != LocalMailer)
		{
			syserr("cannot alias non-local names");
			continue;
		}

		/*
		**  Insert alias into symbol table or DBM file
		*/

		lhssize = strlen(al.q_user) + 1;
		rhssize = strlen(rhs) + 1;

# ifdef DBM
		if (init)
		{
			DATUM key, content;

			key.dsize = lhssize;
			key.dptr = al.q_user;
			content.dsize = rhssize;
			content.dptr = rhs;
			store(key, content);
			free(al.q_user);
			al.q_user = NULL;
		}
		else
# endif DBM
		{
			s = stab(al.q_user, ST_ALIAS, ST_ENTER);
			s->s_alias = newstr(rhs);
		}

		/* statistics */
		naliases++;
		bytes += lhssize + rhssize;
		if (rhssize > longest)
			longest = rhssize;
	}

# ifdef DBM
	if (init)
	{
		/* add the distinquished alias "@" */
		DATUM key, value;
		char last_modified[16];

		    /*
		     * Add the special NIS entries. We can do this
		     * without harm even if this host is not itself a NIS
		     * server.
		     */
		key.dptr = "YP_LAST_MODIFIED";
		key.dsize = strlen(key.dptr);
		sprintf(last_modified,"%10.10d",modtime);
		value.dptr = last_modified;
		value.dsize = strlen(value.dptr);
		store(key, value);

		key.dptr = "YP_MASTER_NAME";
		key.dsize = strlen(key.dptr);
		value.dptr = macvalue('w',CurEnv);
		value.dsize = strlen(value.dptr);
		store(key, value);

		key.dsize = 2;
		key.dptr = "@";
		store(key, key);

		/* restore the old signal */
		(void) signal(SIGINT, oldsigint);
	}
# endif DBM

	/* closing the alias file drops the lock */
	(void) fclose(af);
	CurEnv->e_to = NULL;
	FileName = NULL;
	message(Arpa_Info, "%d aliases, longest %d bytes, %d bytes total",
			naliases, longest, bytes);
# ifdef LOG
	if (LogLevel >= 8)
		syslog(LOG_INFO, "%d aliases, longest %d bytes, %d bytes total",
			naliases, longest, bytes);
# endif LOG
}
/*
**  FORWARD -- Try to forward mail
**
**	This is similar but not identical to aliasing.
**
**	Parameters:
**		user -- the name of the user who's mail we would like
**			to forward to.  It must have been verified --
**			i.e., the q_home field must have been filled
**			in.
**		sendq -- a pointer to the head of the send queue to
**			put this user's aliases in.
**
**	Returns:
**		none.
**
**	Side Effects:
**		New names are added to send queues.
*/

forward(user, sendq)
	ADDRESS *user;
	ADDRESS **sendq;
{
	char buf[60];
	extern bool safefile();

# ifdef DEBUG
	if (tTd(27, 1))
		printf("forward(%s)\n", user->q_paddr);
# endif DEBUG

	if (user->q_mailer != LocalMailer || bitset(QBADADDR, user->q_flags))
		return;
# ifdef DEBUG
	if (user->q_home == NULL)
		syserr("forward: no home");
# endif DEBUG

	/* good address -- look for .forward file in home */
	define('z', user->q_home, CurEnv);
	expand("\001z/.forward", buf, &buf[sizeof buf - 1], CurEnv);
	if (!safefile(buf, user->q_uid, S_IREAD))
		return;

	/* we do have an address to forward to -- do it */
	include(buf, "forwarding", user, sendq);
}