parseaddr.c

操作系统SunOS 4.1.3版本的源码

	                            }
	                            (void) strcat(tokbuf, *avp++);
	                            s = stab(tokbuf, ST_CLASS, ST_FIND);
	                          } while (s == NULL ||
	                                   !bitnset(rp[1], s->s_class));
 
	                          /* found an extension */
	                          mlp[-1].last = avp-1;
	                          rvp++;
	                          break;
	                        }
			cantextend:
				if (*rp == MATCHANY || *rp == MATCHZANY)
				{
					/* extend binding and continue */
					avp = ++mlp[-1].last;

					avp++;
					rvp++;
					break;
				}
				avp--;
				if (*rp == MATCHONE || *rp == MATCHNCLASS 
				     || *rp == MATCHYELLOW 
				     || *rp == MATCHNYELLOW)
				{
					/* back out binding */
					mlp--;
				}
			}

			if (rvp < rwr->r_lhs)
			{
				/* total failure to match */
				break;
			}
		}

		/*
		**  See if we successfully matched
		*/

		if (rvp < rwr->r_lhs || *rvp != NULL)
		{
# ifdef DEBUG
			if (tTd(21, 10))
				printf("----- rule fails\n");
# endif DEBUG
			rwr = rwr->r_next;
			continue;
		}

		rvp = rwr->r_rhs;
# ifdef DEBUG
		if (tTd(21, 12))
		{
			printf("-----rule matches:");
			printav(rvp);
		}
# endif DEBUG

		rp = *rvp;
		if (*rp == CANONUSER)
		{
			rvp++;
			rwr = rwr->r_next;
		}
		else if (*rp == CANONHOST)
		{
			rvp++;
			rwr = NULL;
		}
		else if (*rp == CANONNET)
			rwr = NULL;

		/* substitute */
		for (avp = npvp; *rvp != NULL; rvp++)
		{
			register struct match *m;
			register char **pp;

			rp = *rvp;
			if (*rp == MATCHREPL)
			{
				/* substitute from LHS */
				m = &mlist[rp[1] - '1'];
				if (m >= mlp)
				{
					syserr("rewrite: ruleset %d: replacement out of bounds", ruleset);
					return;
				}
# ifdef DEBUG
				if (tTd(21, 15))
				{
					printf("$%c:", rp[1]);
					pp = m->first;
					while (pp <= m->last)
					{
						printf(" %x=\"", *pp);
						(void) fflush(stdout);
						printf("%s\"", *pp++);
					}
					printf("\n");
				}
# endif DEBUG
				pp = m->first;
				while (pp <= m->last)
				{
					if (avp >= &npvp[MAXATOM])
					{
						goto toolong;
					}
					*avp++ = *pp++;
				}
			}
			else
			{
				/* vanilla replacement */
				if (avp >= &npvp[MAXATOM])
				{
	toolong:
					syserr("expansion too long");
					return;
				}
				*avp++ = rp;
			}
		}
		*avp++ = NULL;

		/*
		**  Check for any hostname lookups.
		*/

		for (rvp = npvp; *rvp != NULL; rvp++)
		{
			char **hbrvp;
			char **xpvp;
			int trsize;
			char *olddelimchar;
			char buf[MAXNAME + 1];
			char *pvpb1[MAXATOM + 1];
			char pvpbuf[PSBUFSIZE];
			extern char *DelimChar;

			if (**rvp != HOSTBEGIN)
				continue;

			/*
			**  Got a hostname lookup.
			**
			**	This could be optimized fairly easily.
			*/

			hbrvp = rvp;

			/* extract the match part */
			while (*++rvp != NULL && **rvp != HOSTEND)
				continue;
			if (*rvp != NULL)
				*rvp++ = NULL;

			/* save the remainder of the input string */
			trsize = (int) (avp - rvp + 1) * sizeof *rvp;
			bcopy((char *) rvp, (char *) pvpb1, trsize);

			/* look it up */
			cataddr(++hbrvp, buf, sizeof buf);
			maphostname(buf, sizeof buf);

			/* scan the new host name */
			olddelimchar = DelimChar;
			xpvp = prescan(buf, '\0', pvpbuf);
			DelimChar = olddelimchar;
			if (xpvp == NULL)
			{
				syserr("rewrite: cannot prescan canonical hostname: %s", buf);
				return;
			}

			/* append it to the token list */
			for (avp = --hbrvp; *xpvp != NULL; xpvp++)
			{
				*avp++ = newstr(*xpvp);
				if (avp >= &npvp[MAXATOM]) {
					goto toolong;
				}
			}

			/* restore the old trailing information */
			for (xpvp = pvpb1; (*avp++ = *xpvp++) != NULL; )
				if (avp >= &npvp[MAXATOM])
					goto toolong;

			break;
		}

		/*
		**  Check for any NIS replacements
		*/

		for (rvp = npvp; *rvp != NULL; rvp++)
		{
			char **hbrvp;
			char **xpvp;
			int trsize;
			char *olddelimchar;
			char buf[MAXNAME + 1];
			char *pvpb1[MAXATOM + 1];
			char pvpbuf[PSBUFSIZE];
			char *mapname;
			extern char *DelimChar;
			extern char *macvalue();

			if (**rvp != YELLOWBEGIN)
				continue;
			if (*++rvp == NULL)
				continue;
			mapname = macvalue(**rvp,CurEnv);

			/*
			**  Got a NIS replacement.
			**
			**	This could be optimized fairly easily.
			*/

			hbrvp = rvp;

			/* extract the match part */
			while (*++rvp != NULL && **rvp != YELLOWEND)
				continue;
			if (*rvp != NULL)
				*rvp++ = NULL;

			/* save the remainder of the input string */
			trsize = (int) (avp - rvp + 1) * sizeof *rvp;
			bcopy((char *) rvp, (char *) pvpb1, trsize);

			/* look it up */
			cataddr(hbrvp + 1, buf, sizeof buf);
			mapusername(mapname, buf, sizeof buf);

			/* scan the new host name */
			olddelimchar = DelimChar;
			xpvp = prescan(buf, '\0', pvpbuf);
			DelimChar = olddelimchar;
			if (xpvp == NULL)
			{
				syserr("cannot prescan NIS result: %s", buf);
				return;
			}

			/* append it to the token list */
			for (avp = --hbrvp; *xpvp != NULL; xpvp++)
			{
				*avp++ = newstr(*xpvp);
				if (avp >= &npvp[MAXATOM])
					goto toolong;
			}

			/* restore the old trailing information */
			for (xpvp = pvpb1; (*avp++ = *xpvp++) != NULL; )
				if (avp >= &npvp[MAXATOM])
					goto toolong;

			break;
		}

		/*
		**  Check for subroutine calls.
		*/

		if (*npvp != NULL && **npvp == CALLSUBR)
		{
			bcopy((char *) &npvp[2], (char *) pvp,
				(int) (avp - npvp - 2) * sizeof *avp);
# ifdef DEBUG
			if (tTd(21, 3))
				printf("-----callsubr %s\n", npvp[1]);
# endif DEBUG
			rewrite(pvp, atoi(npvp[1]));
		}
		else
		{
			bcopy((char *) npvp, (char *) pvp,
				(int) (avp - npvp) * sizeof *avp);
		}
# ifdef DEBUG
		if (tTd(21, 4))
		{
			printf("rewritten as:");
			printav(pvp);
		}
# endif DEBUG
	}

	if (OpMode == MD_TEST || tTd(21, 2))
	{
		printf("rewrite: ruleset %2d returns:", ruleset);
		printav(pvp);
	}
}
/*
**  BUILDADDR -- build address from token vector.
**
**	Parameters:
**		tv -- token vector.
**		a -- pointer to address descriptor to fill.
**			If NULL, one will be allocated.
**
**	Returns:
**		NULL if there was an error.
**		'a' otherwise.
**
**	Side Effects:
**		fills in 'a'
*/

ADDRESS *
buildaddr(tv, a)
	register char **tv;
	register ADDRESS *a;
{
	static char buf[MAXNAME];
	struct mailer **mp;
	register struct mailer *m;
	extern ADDRESS NullAddress;

	if (a == NULL)
		a = (ADDRESS *) xalloc(sizeof *a);
	*a = NullAddress;

	/* figure out what net/mailer to use */
	if (**tv != CANONNET)
	{
		syserr("buildaddr: no mailer");
		return (NULL);
	}
	tv++;
	if (!strcasecmp(*tv, "error"))
	{
		if (**++tv == CANONHOST)
		{
			setstat(atoi(*++tv));
			tv++;
		}
		if (**tv != CANONUSER)
			syserr("buildaddr: error: no user");
		buf[0] = '\0';
		while (*++tv != NULL)
		{
			if (buf[0] != '\0')
				(void) strcat(buf, " ");
			(void) strcat(buf, *tv);
		}
		usrerr("%s", buf);
		return (NULL);
	}
	for (mp = Mailer; (m = *mp++) != NULL; )
	{
		if (!strcasecmp(m->m_name, *tv))
			break;
	}
	if (m == NULL)
	{
		syserr("buildaddr: unknown mailer %s", *tv);
		return (NULL);
 	}
	a->q_mailer = m;

	/* figure out what host (if any) */
	tv++;
	if (!bitnset(M_LOCAL, m->m_flags))
	{
		if (*tv==NULL || **tv++ != CANONHOST)
		{
			syserr("buildaddr: no host");
			return (NULL);
		}
		buf[0] = '\0';
		while (*tv != NULL && **tv != CANONUSER)
			(void) strcat(buf, *tv++);
		a->q_host = newstr(buf);
	}
	else
		a->q_host = NULL;

	/* figure out the user */
	if (*tv==NULL || **tv != CANONUSER)
	{
		syserr("buildaddr: no user");
		return (NULL);
	}

	/* rewrite according recipient mailer rewriting rules */
	rewrite(++tv, 2);
	if (m->m_r_rwset > 0)
		rewrite(tv, m->m_r_rwset);
	rewrite(tv, 4);

	/* save the result for the command line/RCPT argument */
	cataddr(tv, buf, sizeof buf);
	a->q_user = buf;

	return (a);
}
/*
**  CATADDR -- concatenate pieces of addresses (putting in <LWSP> subs)
**
**	Parameters:
**		pvp -- parameter vector to rebuild.
**		buf -- buffer to build the string into.
**		sz -- size of buf.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Destroys buf.
*/

cataddr(pvp, buf, sz)
	char **pvp;
	char *buf;
	register int sz;
{
	bool oatomtok = FALSE;
	bool natomtok = FALSE;
	register int i;
	register char *p;

	if (pvp == NULL)
	{
		(void) strcpy(buf, "");
		return;
	}
	p = buf;
	sz -= 2;
	while (*pvp != NULL && (i = strlen(*pvp)) < sz)
	{
		natomtok = (toktype(**pvp) == ATM);
		if (oatomtok && natomtok)
			*p++ = SpaceSub;
		(void) strcpy(p, *pvp);
		oatomtok = natomtok;
		p += i;
		sz -= i + 1;
		pvp++;
	}
	*p = '\0';
}
/*
**  SAMEADDR -- Determine if two addresses are the same
**
**	This is not just a straight comparison -- if the mailer doesn't
**	care about the host we just ignore it, etc.
**
**	Parameters:
**		a, b -- pointers to the internal forms to compare.
**
**	Returns:
**		TRUE -- they represent the same mailbox.
**		FALSE -- they don't.
**
**	Side Effects:
**		none.
*/

bool
sameaddr(a, b)
	register ADDRESS *a;
	register ADDRESS *b;
{
	/* if they don't have the same mailer, forget it */
	if (a->q_mailer != b->q_mailer)
		return (FALSE);

	/* if the user isn't the same, we can drop out */
	if (strcmp(a->q_user, b->q_user) != 0)
		return (FALSE);

	/* if the mailer ignores hosts, we have succeeded! */
	if (bitnset(M_LOCAL, a->q_mailer->m_flags))
		return (TRUE);

	/* otherwise compare hosts (but be careful for NULL ptrs) */
	if (a->q_host == NULL || b->q_host == NULL)
		return (FALSE);
	if (strcmp(a->q_host, b->q_host) != 0)
		return (FALSE);

	return (TRUE);
}
/*
**  PRINTADDR -- print address (for debugging)
**
**	Parameters:
**		a -- the address to print
**		follow -- follow the q_next chain.
**
**	Returns:
**		none.
**
**	Side Effects:
**		none.
*/

# ifdef DEBUG

printaddr(a, follow)
	register ADDRESS *a;
	bool follow;
{
	bool first = TRUE;

	while (a != NULL)
	{
		first = FALSE;
		printf("%x=", a);
		(void) fflush(stdout);
		printf("%s: mailer %d (%s), host `%s', user `%s', ruser `%s'\n",
		       a->q_paddr, a->q_mailer->m_mno, a->q_mailer->m_name,
		       a->q_host, a->q_user, a->q_ruser? a->q_ruser: "<null>");
		printf("\tnext=%x, flags=%o, alias %x\n", a->q_next, a->q_flags,
		       a->q_alias);
		printf("\thome=\"%s\", fullname=\"%s\"\n", a->q_home,
		       a->q_fullname);

		if (!follow)
			return;
		a = a->q_next;
	}
	if (first)
		printf("[NULL]\n");
}

# endif DEBUG
/*
**  REMOTENAME -- return the name relative to the current mailer
**
**	Parameters:
**		name -- the name to translate.
**		m -- the mailer that we want to do rewriting relative
**			to.
**		senderaddress -- if set, uses the sender rewriting rules
**			rather than the recipient rewriting rules.
**		canonical -- if set, strip out any comment information,
**			etc.
**
**	Returns:
**		the text string representing this address relative to
**			the receiving mailer.
**
**	Side Effects:
**		none.
**
**	Warnings:
**		The text string returned is tucked away locally;
**			copy it if you intend to save it.
*/

char *
remotename(name, m, senderaddress, canonical)
	char *name;
	struct mailer *m;
	bool senderaddress;
	bool canonical;
{
	register char **pvp;
	char *fancy;
	extern char *macvalue();
	char *oldg = macvalue('g', CurEnv);
	static char buf[MAXNAME];
	char lbuf[MAXNAME];
	char pvpbuf[PSBUFSIZE];
	extern char **prescan();
	extern char *crackaddr();

# ifdef DEBUG
	if (tTd(12, 1))
		printf("remotename(%s)\n", name);
# endif DEBUG

	/* don't do anything if we are tagging it as special */
	if ((senderaddress ? m->m_s_rwset : m->m_r_rwset) < 0)
		return (name);

	/*
	**  Do a heuristic crack of this name to extract any comment info.
	**	This will leave the name as a comment and a $g macro.
	*/

	if (canonical)
		fancy = "\001g";
	else
		fancy = crackaddr(name);

	/*
	**  Turn the name into canonical form.
	**	Normally this will be RFC 822 style, i.e., "user@domain".
	**	If this only resolves to "user", and the "C" flag is
	**	specified in the sending mailer, then the sender's
	**	domain will be appended.
	*/

	pvp = prescan(name, '\0', pvpbuf);
	if (pvp == NULL)
		return (name);
	rewrite(pvp, 3);
	if (CurEnv->e_fromdomain != NULL)
	{
		/* append from domain to this address */
		register char **pxp = pvp;

		/* see if there is an "@domain" in the current name */
		while (*pxp != NULL && strcmp(*pxp, "@") != 0)
			pxp++;
		if (*pxp == NULL)
		{
			/* no.... append the "@domain" from the sender */
			register char **qxq = CurEnv->e_fromdomain;

			  /*
			   * WARNING: this is necessary because we want to
			   * get uucp domain names too, which means
			   * we have to do this before the from address
			   * gets defocused by ruleset 4.
			   */
			while (*qxq != NULL && **qxq != '>')
				*pxp++ = *qxq++;
			*pxp = NULL;
			rewrite(pvp, 3);
		}
	}

	/*
	**  Do more specific rewriting.
	**	Rewrite using ruleset 1 or 2 depending on whether this is
	**		a sender address or not.
	**	Then run it through any receiving-mailer-specific rulesets.
	*/

	if (senderaddress)
	{
		rewrite(pvp, 1);
		if (m->m_s_rwset > 0)
			rewrite(pvp, m->m_s_rwset);
	}
	else
	{
		rewrite(pvp, 2);
		if (m->m_r_rwset > 0)
			rewrite(pvp, m->m_r_rwset);
	}

	/*
	**  Do any final sanitation the address may require.
	**	This will normally be used to turn internal forms
	**	(e.g., [e-mail]) into external form.  This
	**	may be used as a default to the above rules.
	*/

	rewrite(pvp, 4);

	/*
	**  Now restore the comment information we had at the beginning.
	*/

	cataddr(pvp, lbuf, sizeof lbuf);
	define('g', lbuf, CurEnv);
	expand(fancy, buf, &buf[sizeof buf - 1], CurEnv);
	define('g', oldg, CurEnv);

# ifdef DEBUG
	if (tTd(12, 1))
		printf("remotename => `%s'\n", buf);
# endif DEBUG
	return (buf);
}