envelope.c

早期freebsd实现

	/* hop count */
	(void) sprintf(cbuf, "%d", e->e_hopcount);
	define('c', newstr(cbuf), e);

	/* time as integer, unix time, arpa time */
	settime(e);

#ifdef TTYNAME
	/* tty name */
	if (macvalue('y', e) == NULL)
	{
		p = ttyname(2);
		if (p != NULL)
		{
			if (strrchr(p, '/') != NULL)
				p = strrchr(p, '/') + 1;
			(void) strcpy(ybuf, p);
			define('y', ybuf, e);
		}
	}
#endif /* TTYNAME */
}
/*
**  SETTIME -- set the current time.
**
**	Parameters:
**		none.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Sets the various time macros -- $a, $b, $d, $t.
*/

void
settime(e)
	register ENVELOPE *e;
{
	register char *p;
	auto time_t now;
	char tbuf[20];				/* holds "current" time */
	char dbuf[30];				/* holds ctime(tbuf) */
	register struct tm *tm;
	extern char *arpadate();
	extern struct tm *gmtime();

	now = curtime();
	tm = gmtime(&now);
	(void) sprintf(tbuf, "%04d%02d%02d%02d%02d", tm->tm_year + 1900,
			tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min);
	define('t', newstr(tbuf), e);
	(void) strcpy(dbuf, ctime(&now));
	p = strchr(dbuf, '\n');
	if (p != NULL)
		*p = '\0';
	define('d', newstr(dbuf), e);
	p = arpadate(dbuf);
	p = newstr(p);
	if (macvalue('a', e) == NULL)
		define('a', p, e);
	define('b', p, e);
}
/*
**  OPENXSCRIPT -- Open transcript file
**
**	Creates a transcript file for possible eventual mailing or
**	sending back.
**
**	Parameters:
**		e -- the envelope to create the transcript in/for.
**
**	Returns:
**		none
**
**	Side Effects:
**		Creates the transcript file.
*/

#ifndef O_APPEND
#define O_APPEND	0
#endif

void
openxscript(e)
	register ENVELOPE *e;
{
	register char *p;
	int fd;

	if (e->e_xfp != NULL)
		return;
	p = queuename(e, 'x');
	fd = open(p, O_WRONLY|O_CREAT|O_APPEND, 0644);
	if (fd < 0)
	{
		syserr("Can't create transcript file %s", p);
		fd = open("/dev/null", O_WRONLY, 0644);
		if (fd < 0)
			syserr("!Can't open /dev/null");
	}
	e->e_xfp = fdopen(fd, "w");
	if (e->e_xfp == NULL)
	{
		syserr("!Can't create transcript stream %s", p);
	}
	if (tTd(46, 9))
	{
		printf("openxscript(%s):\n  ", p);
		dumpfd(fileno(e->e_xfp), TRUE, FALSE);
	}
}
/*
**  CLOSEXSCRIPT -- close the transcript file.
**
**	Parameters:
**		e -- the envelope containing the transcript to close.
**
**	Returns:
**		none.
**
**	Side Effects:
**		none.
*/

void
closexscript(e)
	register ENVELOPE *e;
{
	if (e->e_xfp == NULL)
		return;
	(void) xfclose(e->e_xfp, "closexscript", e->e_id);
	e->e_xfp = NULL;
}
/*
**  SETSENDER -- set the person who this message is from
**
**	Under certain circumstances allow the user to say who
**	s/he is (using -f or -r).  These are:
**	1.  The user's uid is zero (root).
**	2.  The user's login name is in an approved list (typically
**	    from a network server).
**	3.  The address the user is trying to claim has a
**	    "!" character in it (since #2 doesn't do it for
**	    us if we are dialing out for UUCP).
**	A better check to replace #3 would be if the
**	effective uid is "UUCP" -- this would require me
**	to rewrite getpwent to "grab" uucp as it went by,
**	make getname more nasty, do another passwd file
**	scan, or compile the UID of "UUCP" into the code,
**	all of which are reprehensible.
**
**	Assuming all of these fail, we figure out something
**	ourselves.
**
**	Parameters:
**		from -- the person we would like to believe this message
**			is from, as specified on the command line.
**		e -- the envelope in which we would like the sender set.
**		delimptr -- if non-NULL, set to the location of the
**			trailing delimiter.
**		internal -- set if this address is coming from an internal
**			source such as an owner alias.
**
**	Returns:
**		none.
**
**	Side Effects:
**		sets sendmail's notion of who the from person is.
*/

void
setsender(from, e, delimptr, internal)
	char *from;
	register ENVELOPE *e;
	char **delimptr;
	bool internal;
{
	register char **pvp;
	char *realname = NULL;
	register struct passwd *pw;
	char delimchar;
	char *bp;
	char buf[MAXNAME + 2];
	char pvpbuf[PSBUFSIZE];
	extern struct passwd *getpwnam();
	extern char *FullName;

	if (tTd(45, 1))
		printf("setsender(%s)\n", from == NULL ? "" : from);

	/*
	**  Figure out the real user executing us.
	**	Username can return errno != 0 on non-errors.
	*/

	if (bitset(EF_QUEUERUN, e->e_flags) || OpMode == MD_SMTP ||
	    OpMode == MD_ARPAFTP || OpMode == MD_DAEMON)
		realname = from;
	if (realname == NULL || realname[0] == '\0')
		realname = username();

	if (ConfigLevel < 2)
		SuprErrs = TRUE;

	delimchar = internal ? '\0' : ' ';
	e->e_from.q_flags = QBADADDR;
	if (from == NULL ||
	    parseaddr(from, &e->e_from, RF_COPYALL|RF_SENDERADDR,
		      delimchar, delimptr, e) == NULL ||
	    bitset(QBADADDR, e->e_from.q_flags) ||
	    e->e_from.q_mailer == ProgMailer ||
	    e->e_from.q_mailer == FileMailer ||
	    e->e_from.q_mailer == InclMailer)
	{
		/* log garbage addresses for traceback */
# ifdef LOG
		if (from != NULL && LogLevel > 2)
		{
			char *p;
			char ebuf[MAXNAME * 2 + 2];

			p = macvalue('_', e);
			if (p == NULL)
			{
				char *host = RealHostName;
				if (host == NULL)
					host = MyHostName;
				(void) sprintf(ebuf, "%s@%s", realname, host);
				p = ebuf;
			}
			syslog(LOG_NOTICE,
				"setsender: %s: invalid or unparseable, received from %s",
				shortenstring(from, 83), p);
		}
# endif /* LOG */
		if (from != NULL)
		{
			if (!bitset(QBADADDR, e->e_from.q_flags))
			{
				/* it was a bogus mailer in the from addr */
				usrerr("553 Invalid sender address");
			}
			SuprErrs = TRUE;
		}
		if (from == realname ||
		    parseaddr(from = newstr(realname), &e->e_from,
			      RF_COPYALL|RF_SENDERADDR, ' ', NULL, e) == NULL)
		{
			char nbuf[100];

			SuprErrs = TRUE;
			expand("\201n", nbuf, &nbuf[sizeof nbuf], e);
			if (parseaddr(from = newstr(nbuf), &e->e_from,
				      RF_COPYALL, ' ', NULL, e) == NULL &&
			    parseaddr(from = "postmaster", &e->e_from,
			    	      RF_COPYALL, ' ', NULL, e) == NULL)
				syserr("553 setsender: can't even parse postmaster!");
		}
	}
	else
		FromFlag = TRUE;
	e->e_from.q_flags |= QDONTSEND;
	if (tTd(45, 5))
	{
		printf("setsender: QDONTSEND ");
		printaddr(&e->e_from, FALSE);
	}
	SuprErrs = FALSE;

	pvp = NULL;
	if (e->e_from.q_mailer == LocalMailer)
	{
# ifdef USERDB
		register char *p;
		extern char *udbsender();
# endif

		if (!internal)
		{
			/* if the user has given fullname already, don't redefine */
			if (FullName == NULL)
				FullName = macvalue('x', e);
			if (FullName != NULL && FullName[0] == '\0')
				FullName = NULL;

# ifdef USERDB
			p = udbsender(e->e_from.q_user);

			if (p != NULL)
			{
				/*
				**  We have an alternate address for the sender
				*/

				pvp = prescan(p, '\0', pvpbuf, sizeof pvpbuf, NULL);
			}
# endif /* USERDB */
		}

		if ((pw = getpwnam(e->e_from.q_user)) != NULL)
		{
			/*
			**  Process passwd file entry.
			*/

			/* extract home directory */
			if (strcmp(pw->pw_dir, "/") == 0)
				e->e_from.q_home = newstr("");
			else
				e->e_from.q_home = newstr(pw->pw_dir);
			define('z', e->e_from.q_home, e);

			/* extract user and group id */
			e->e_from.q_uid = pw->pw_uid;
			e->e_from.q_gid = pw->pw_gid;
			e->e_from.q_flags |= QGOODUID;

			/* extract full name from passwd file */
			if (FullName == NULL && pw->pw_gecos != NULL &&
			    strcmp(pw->pw_name, e->e_from.q_user) == 0 &&
			    !internal)
			{
				buildfname(pw->pw_gecos, e->e_from.q_user, buf);
				if (buf[0] != '\0')
					FullName = newstr(buf);
			}
		}
		if (FullName != NULL && !internal)
			define('x', FullName, e);
	}
	else if (!internal && OpMode != MD_DAEMON)
	{
		if (e->e_from.q_home == NULL)
		{
			e->e_from.q_home = getenv("HOME");
			if (e->e_from.q_home != NULL &&
			    strcmp(e->e_from.q_home, "/") == 0)
				e->e_from.q_home++;
		}
		e->e_from.q_uid = RealUid;
		e->e_from.q_gid = RealGid;
		e->e_from.q_flags |= QGOODUID;
	}

	/*
	**  Rewrite the from person to dispose of possible implicit
	**	links in the net.
	*/

	if (pvp == NULL)
		pvp = prescan(from, delimchar, pvpbuf, sizeof pvpbuf, NULL);
	if (pvp == NULL)
	{
		/* don't need to give error -- prescan did that already */
# ifdef LOG
		if (LogLevel > 2)
			syslog(LOG_NOTICE, "cannot prescan from (%s)", from);
# endif
		finis();
	}
	(void) rewrite(pvp, 3, 0, e);
	(void) rewrite(pvp, 1, 0, e);
	(void) rewrite(pvp, 4, 0, e);
	bp = buf + 1;
	cataddr(pvp, NULL, bp, sizeof buf - 2, '\0');
	if (*bp == '@')
	{
		/* heuristic: route-addr: add angle brackets */
		strcat(bp, ">");
		*--bp = '<';
	}
	e->e_sender = newstr(bp);
	define('f', e->e_sender, e);

	/* save the domain spec if this mailer wants it */
	if (e->e_from.q_mailer != NULL &&
	    bitnset(M_CANONICAL, e->e_from.q_mailer->m_flags))
	{
		extern char **copyplist();

		while (*pvp != NULL && strcmp(*pvp, "@") != 0)
			pvp++;
		if (*pvp != NULL)
			e->e_fromdomain = copyplist(pvp, TRUE);
	}
}