conf.c

早期freebsd实现

/*
 * Copyright (c) 1983 Eric P. Allman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)conf.c	8.89 (Berkeley) 4/18/94";
#endif /* not lint */

# include "sendmail.h"
# include "pathnames.h"
# include <sys/ioctl.h>
# include <sys/param.h>
# include <netdb.h>
# include <pwd.h>

/*
**  CONF.C -- Sendmail Configuration Tables.
**
**	Defines the configuration of this installation.
**
**	Configuration Variables:
**		HdrInfo -- a table describing well-known header fields.
**			Each entry has the field name and some flags,
**			which are described in sendmail.h.
**
**	Notes:
**		I have tried to put almost all the reasonable
**		configuration information into the configuration
**		file read at runtime.  My intent is that anything
**		here is a function of the version of UNIX you
**		are running, or is really static -- for example
**		the headers are a superset of widely used
**		protocols.  If you find yourself playing with
**		this file too much, you may be making a mistake!
*/




/*
**  Header info table
**	Final (null) entry contains the flags used for any other field.
**
**	Not all of these are actually handled specially by sendmail
**	at this time.  They are included as placeholders, to let
**	you know that "someday" I intend to have sendmail do
**	something with them.
*/

struct hdrinfo	HdrInfo[] =
{
		/* originator fields, most to least significant  */
	"resent-sender",	H_FROM|H_RESENT,
	"resent-from",		H_FROM|H_RESENT,
	"resent-reply-to",	H_FROM|H_RESENT,
	"sender",		H_FROM,
	"from",			H_FROM,
	"reply-to",		H_FROM,
	"full-name",		H_ACHECK,
	"return-receipt-to",	H_FROM|H_RECEIPTTO,
	"errors-to",		H_FROM|H_ERRORSTO,

		/* destination fields */
	"to",			H_RCPT,
	"resent-to",		H_RCPT|H_RESENT,
	"cc",			H_RCPT,
	"resent-cc",		H_RCPT|H_RESENT,
	"bcc",			H_RCPT|H_ACHECK,
	"resent-bcc",		H_RCPT|H_ACHECK|H_RESENT,
	"apparently-to",	H_RCPT,

		/* message identification and control */
	"message-id",		0,
	"resent-message-id",	H_RESENT,
	"message",		H_EOH,
	"text",			H_EOH,

		/* date fields */
	"date",			0,
	"resent-date",		H_RESENT,

		/* trace fields */
	"received",		H_TRACE|H_FORCE,
	"x400-received",	H_TRACE|H_FORCE,
	"via",			H_TRACE|H_FORCE,
	"mail-from",		H_TRACE|H_FORCE,

		/* miscellaneous fields */
	"comments",		H_FORCE,
	"return-path",		H_FORCE|H_ACHECK,

	NULL,			0,
};



/*
**  Location of system files/databases/etc.
*/

char	*PidFile =	_PATH_SENDMAILPID;	/* stores daemon proc id */



/*
**  Privacy values
*/

struct prival PrivacyValues[] =
{
	"public",		PRIV_PUBLIC,
	"needmailhelo",		PRIV_NEEDMAILHELO,
	"needexpnhelo",		PRIV_NEEDEXPNHELO,
	"needvrfyhelo",		PRIV_NEEDVRFYHELO,
	"noexpn",		PRIV_NOEXPN,
	"novrfy",		PRIV_NOVRFY,
	"restrictmailq",	PRIV_RESTRICTMAILQ,
	"restrictqrun",		PRIV_RESTRICTQRUN,
	"authwarnings",		PRIV_AUTHWARNINGS,
	"noreceipts",		PRIV_NORECEIPTS,
	"goaway",		PRIV_GOAWAY,
	NULL,			0,
};



/*
**  Miscellaneous stuff.
*/

int	DtableSize =	50;		/* max open files; reset in 4.2bsd */


/*
**  Following should be config parameters (and probably will be in
**  future releases).  In the meantime, setting these is considered
**  unsupported, and is intentionally undocumented.
*/

#ifdef BROKENSMTPPEERS
bool	BrokenSmtpPeers = TRUE;		/* set if you have broken SMTP peers */
#else
bool	BrokenSmtpPeers = FALSE;	/* set if you have broken SMTP peers */
#endif
#ifdef NOLOOPBACKCHECK
bool	CheckLoopBack = FALSE;		/* set to check HELO loopback */
#else
bool	CheckLoopBack = TRUE;		/* set to check HELO loopback */
#endif

/*
**  SETDEFAULTS -- set default values
**
**	Because of the way freezing is done, these must be initialized
**	using direct code.
**
**	Parameters:
**		e -- the default envelope.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Initializes a bunch of global variables to their
**		default values.
*/

#define DAYS		* 24 * 60 * 60

setdefaults(e)
	register ENVELOPE *e;
{
	SpaceSub = ' ';				/* option B */
	QueueLA = 8;				/* option x */
	RefuseLA = 12;				/* option X */
	WkRecipFact = 30000L;			/* option y */
	WkClassFact = 1800L;			/* option z */
	WkTimeFact = 90000L;			/* option Z */
	QueueFactor = WkRecipFact * 20;		/* option q */
	FileMode = (RealUid != geteuid()) ? 0644 : 0600;
						/* option F */
	DefUid = 1;				/* option u */
	DefGid = 1;				/* option g */
	CheckpointInterval = 10;		/* option C */
	MaxHopCount = 25;			/* option h */
	e->e_sendmode = SM_FORK;		/* option d */
	e->e_errormode = EM_PRINT;		/* option e */
	SevenBit = FALSE;			/* option 7 */
	MaxMciCache = 1;			/* option k */
	MciCacheTimeout = 300;			/* option K */
	LogLevel = 9;				/* option L */
	settimeouts(NULL);			/* option r */
	TimeOuts.to_q_return = 5 DAYS;		/* option T */
	TimeOuts.to_q_warning = 0;		/* option T */
	PrivacyFlags = 0;			/* option p */
	setdefuser();
	setupmaps();
	setupmailers();
}


/*
**  SETDEFUSER -- set/reset DefUser using DefUid (for initgroups())
*/

setdefuser()
{
	struct passwd *defpwent;
	static char defuserbuf[40];

	DefUser = defuserbuf;
	if ((defpwent = getpwuid(DefUid)) != NULL)
		strcpy(defuserbuf, defpwent->pw_name);
	else
		strcpy(defuserbuf, "nobody");
}
/*
**  HOST_MAP_INIT -- initialize host class structures
*/

bool
host_map_init(map, args)
	MAP *map;
	char *args;
{
	register char *p = args;

	for (;;)
	{
		while (isascii(*p) && isspace(*p))
			p++;
		if (*p != '-')
			break;
		switch (*++p)
		{
		  case 'a':
			map->map_app = ++p;
			break;
		}
		while (*p != '\0' && !(isascii(*p) && isspace(*p)))
			p++;
		if (*p != '\0')
			*p++ = '\0';
	}
	if (map->map_app != NULL)
		map->map_app = newstr(map->map_app);
	return TRUE;
}
/*
**  SETUPMAILERS -- initialize default mailers
*/

setupmailers()
{
	char buf[100];

	strcpy(buf, "prog, P=/bin/sh, F=lsD, A=sh -c $u");
	makemailer(buf);

	strcpy(buf, "*file*, P=/dev/null, F=lsDFMPEu, A=FILE");
	makemailer(buf);

	strcpy(buf, "*include*, P=/dev/null, F=su, A=INCLUDE");
	makemailer(buf);
}
/*
**  SETUPMAPS -- set up map classes
*/

#define MAPDEF(name, ext, flags, parse, open, close, lookup, store) \
	{ \
		extern bool parse __P((MAP *, char *)); \
		extern bool open __P((MAP *, int)); \
		extern void close __P((MAP *)); \
		extern char *lookup __P((MAP *, char *, char **, int *)); \
		extern void store __P((MAP *, char *, char *)); \
		s = stab(name, ST_MAPCLASS, ST_ENTER); \
		s->s_mapclass.map_cname = name; \
		s->s_mapclass.map_ext = ext; \
		s->s_mapclass.map_cflags = flags; \
		s->s_mapclass.map_parse = parse; \
		s->s_mapclass.map_open = open; \
		s->s_mapclass.map_close = close; \
		s->s_mapclass.map_lookup = lookup; \
		s->s_mapclass.map_store = store; \
	}

setupmaps()
{
	register STAB *s;

#ifdef NEWDB
	MAPDEF("hash", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, hash_map_open, db_map_close,
		db_map_lookup, db_map_store);
	MAPDEF("btree", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, bt_map_open, db_map_close,
		db_map_lookup, db_map_store);
#endif

#ifdef NDBM
	MAPDEF("dbm", ".dir", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, ndbm_map_open, ndbm_map_close,
		ndbm_map_lookup, ndbm_map_store);
#endif

#ifdef NIS
	MAPDEF("nis", NULL, MCF_ALIASOK,
		map_parseargs, nis_map_open, nis_map_close,
		nis_map_lookup, nis_map_store);
#endif

	MAPDEF("stab", NULL, MCF_ALIASOK|MCF_ALIASONLY,
		map_parseargs, stab_map_open, stab_map_close,
		stab_map_lookup, stab_map_store);

	MAPDEF("implicit", NULL, MCF_ALIASOK|MCF_ALIASONLY|MCF_REBUILDABLE,
		map_parseargs, impl_map_open, impl_map_close,
		impl_map_lookup, impl_map_store);

	/* host DNS lookup */
	MAPDEF("host", NULL, 0,
		host_map_init, null_map_open, null_map_close,
		host_map_lookup, null_map_store);

	/* dequote map */
	MAPDEF("dequote", NULL, 0,
		dequote_init, null_map_open, null_map_close,
		dequote_map, null_map_store);

#if 0
# ifdef USERDB
	/* user database */
	MAPDEF("udb", ".db", 0,
		udb_map_parse, null_map_open, null_map_close,
		udb_map_lookup, null_map_store);
# endif
#endif
}

#undef MAPDEF
/*
**  USERNAME -- return the user id of the logged in user.
**
**	Parameters:
**		none.
**
**	Returns:
**		The login name of the logged in user.
**
**	Side Effects:
**		none.
**
**	Notes:
**		The return value is statically allocated.
*/

char *
username()
{
	static char *myname = NULL;
	extern char *getlogin();
	register struct passwd *pw;

	/* cache the result */
	if (myname == NULL)
	{
		myname = getlogin();
		if (myname == NULL || myname[0] == '\0')
		{
			pw = getpwuid(RealUid);
			if (pw != NULL)
				myname = newstr(pw->pw_name);
		}
		else
		{
			uid_t uid = RealUid;

			myname = newstr(myname);
			if ((pw = getpwnam(myname)) == NULL ||
			      (uid != 0 && uid != pw->pw_uid))
			{
				pw = getpwuid(uid);
				if (pw != NULL)
					myname = newstr(pw->pw_name);
			}
		}
		if (myname == NULL || myname[0] == '\0')
		{
			syserr("554 Who are you?");
			myname = "postmaster";
		}
	}

	return (myname);
}
/*
**  TTYPATH -- Get the path of the user's tty
**
**	Returns the pathname of the user's tty.  Returns NULL if
**	the user is not logged in or if s/he has write permission
**	denied.
**
**	Parameters:
**		none
**
**	Returns:
**		pathname of the user's tty.
**		NULL if not logged in or write permission denied.
**
**	Side Effects:
**		none.
**
**	WARNING:
**		Return value is in a local buffer.
**
**	Called By:
**		savemail
*/

char *
ttypath()
{
	struct stat stbuf;
	register char *pathn;
	extern char *ttyname();
	extern char *getlogin();

	/* compute the pathname of the controlling tty */
	if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
	    (pathn = ttyname(0)) == NULL)
	{
		errno = 0;
		return (NULL);
	}

	/* see if we have write permission */
	if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
	{
		errno = 0;
		return (NULL);
	}

	/* see if the user is logged in */
	if (getlogin() == NULL)
		return (NULL);

	/* looks good */
	return (pathn);
}
/*
**  CHECKCOMPAT -- check for From and To person compatible.
**
**	This routine can be supplied on a per-installation basis
**	to determine whether a person is allowed to send a message.
**	This allows restriction of certain types of internet
**	forwarding or registration of users.
**
**	If the hosts are found to be incompatible, an error
**	message should be given using "usrerr" and 0 should
**	be returned.
**
**	'NoReturn' can be set to suppress the return-to-sender
**	function; this should be done on huge messages.
**
**	Parameters:
**		to -- the person being sent to.
**
**	Returns:
**		an exit status
**
**	Side Effects:
**		none (unless you include the usrerr stuff)
*/

checkcompat(to, e)
	register ADDRESS *to;
	register ENVELOPE *e;
{
# ifdef lint
	if (to == NULL)
		to++;
# endif /* lint */

	if (tTd(49, 1))
		printf("checkcompat(to=%s, from=%s)\n",
			to->q_paddr, e->e_from.q_paddr);

# ifdef EXAMPLE_CODE
	/* this code is intended as an example only */
	register STAB *s;

	s = stab("arpa", ST_MAILER, ST_FIND);
	if (s != NULL && e->e_from.q_mailer != LocalMailer &&
	    to->q_mailer == s->s_mailer)
	{
		usrerr("553 No ARPA mail through this machine: see your system administration");
		/* NoReturn = TRUE; to supress return copy */
		return (EX_UNAVAILABLE);
	}
# endif /* EXAMPLE_CODE */
	return (EX_OK);
}
/*
**  SETSIGNAL -- set a signal handler
**
**	This is essentially old BSD "signal(3)".
*/

sigfunc_t
setsignal(sig, handler)
	int sig;
	sigfunc_t handler;
{
#if defined(SYS5SIGNALS) || defined(BSD4_3) || defined(_AUX_SOURCE)
	return signal(sig, handler);
#else
	struct sigaction n, o;

	bzero(&n, sizeof n);
	n.sa_handler = handler;
	if (sigaction(sig, &n, &o) < 0)
		return SIG_ERR;
	return o.sa_handler;
#endif
}
/*
**  HOLDSIGS -- arrange to hold all signals
**
**	Parameters:
**		none.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Arranges that signals are held.
*/

holdsigs()
{
}
/*
**  RLSESIGS -- arrange to release all signals
**
**	This undoes the effect of holdsigs.
**
**	Parameters:
**		none.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Arranges that signals are released.
*/

rlsesigs()
{
}
/*
**  INIT_MD -- do machine dependent initializations
**
**	Systems that have global modes that should be set should do
**	them here rather than in main.