headers.c

早期freebsd实现

		sbp += strlen(sbp);
	}
	p = macvalue('r', e);
	if (p != NULL)
	{
		sprintf(sbp, " proto=%s,", p);
		sbp += strlen(sbp);
	}
	syslog(LOG_INFO, "%s relay=%s", sbuf, name);
#  endif
# endif
}
/*
**  PRIENCODE -- encode external priority names into internal values.
**
**	Parameters:
**		p -- priority in ascii.
**
**	Returns:
**		priority as a numeric level.
**
**	Side Effects:
**		none.
*/

priencode(p)
	char *p;
{
	register int i;

	for (i = 0; i < NumPriorities; i++)
	{
		if (!strcasecmp(p, Priorities[i].pri_name))
			return (Priorities[i].pri_val);
	}

	/* unknown priority */
	return (0);
}
/*
**  CRACKADDR -- parse an address and turn it into a macro
**
**	This doesn't actually parse the address -- it just extracts
**	it and replaces it with "$g".  The parse is totally ad hoc
**	and isn't even guaranteed to leave something syntactically
**	identical to what it started with.  However, it does leave
**	something semantically identical.
**
**	This algorithm has been cleaned up to handle a wider range
**	of cases -- notably quoted and backslash escaped strings.
**	This modification makes it substantially better at preserving
**	the original syntax.
**
**	Parameters:
**		addr -- the address to be cracked.
**
**	Returns:
**		a pointer to the new version.
**
**	Side Effects:
**		none.
**
**	Warning:
**		The return value is saved in local storage and should
**		be copied if it is to be reused.
*/

char *
crackaddr(addr)
	register char *addr;
{
	register char *p;
	register char c;
	int cmtlev;
	int realcmtlev;
	int anglelev, realanglelev;
	int copylev;
	bool qmode;
	bool realqmode;
	bool skipping;
	bool putgmac = FALSE;
	bool quoteit = FALSE;
	bool gotangle = FALSE;
	register char *bp;
	char *buflim;
	static char buf[MAXNAME];

	if (tTd(33, 1))
		printf("crackaddr(%s)\n", addr);

	/* strip leading spaces */
	while (*addr != '\0' && isascii(*addr) && isspace(*addr))
		addr++;

	/*
	**  Start by assuming we have no angle brackets.  This will be
	**  adjusted later if we find them.
	*/

	bp = buf;
	buflim = &buf[sizeof buf - 5];
	p = addr;
	copylev = anglelev = realanglelev = cmtlev = realcmtlev = 0;
	qmode = realqmode = FALSE;

	while ((c = *p++) != '\0')
	{
		/*
		**  If the buffer is overful, go into a special "skipping"
		**  mode that tries to keep legal syntax but doesn't actually
		**  output things.
		*/

		skipping = bp >= buflim;

		if (copylev > 0 && !skipping)
			*bp++ = c;

		/* check for backslash escapes */
		if (c == '\\')
		{
			/* arrange to quote the address */
			if (cmtlev <= 0 && !qmode)
				quoteit = TRUE;

			if ((c = *p++) == '\0')
			{
				/* too far */
				p--;
				goto putg;
			}
			if (copylev > 0 && !skipping)
				*bp++ = c;
			goto putg;
		}

		/* check for quoted strings */
		if (c == '"' && cmtlev <= 0)
		{
			qmode = !qmode;
			if (copylev > 0 && !skipping)
				realqmode = !realqmode;
			continue;
		}
		if (qmode)
			goto putg;

		/* check for comments */
		if (c == '(')
		{
			cmtlev++;

			/* allow space for closing paren */
			if (!skipping)
			{
				buflim--;
				realcmtlev++;
				if (copylev++ <= 0)
				{
					*bp++ = ' ';
					*bp++ = c;
				}
			}
		}
		if (cmtlev > 0)
		{
			if (c == ')')
			{
				cmtlev--;
				copylev--;
				if (!skipping)
				{
					realcmtlev--;
					buflim++;
				}
			}
			continue;
		}
		else if (c == ')')
		{
			/* syntax error: unmatched ) */
			if (copylev > 0 && !skipping)
				bp--;
		}

		/* check for characters that may have to be quoted */
		if (strchr(".'@,;:\\()[]", c) != NULL)
		{
			/*
			**  If these occur as the phrase part of a <>
			**  construct, but are not inside of () or already
			**  quoted, they will have to be quoted.  Note that
			**  now (but don't actually do the quoting).
			*/

			if (cmtlev <= 0 && !qmode)
				quoteit = TRUE;
		}

		/* check for angle brackets */
		if (c == '<')
		{
			register char *q;

			/* assume first of two angles is bogus */
			if (gotangle)
				quoteit = TRUE;
			gotangle = TRUE;

			/* oops -- have to change our mind */
			anglelev = 1;
			if (!skipping)
				realanglelev = 1;

			bp = buf;
			if (quoteit)
			{
				*bp++ = '"';

				/* back up over the '<' and any spaces */
				--p;
				while (isascii(*--p) && isspace(*p))
					continue;
				p++;
			}
			for (q = addr; q < p; )
			{
				c = *q++;
				if (bp < buflim)
				{
					if (quoteit && c == '"')
						*bp++ = '\\';
					*bp++ = c;
				}
			}
			if (quoteit)
			{
				if (bp == &buf[1])
					bp--;
				else
					*bp++ = '"';
				while ((c = *p++) != '<')
				{
					if (bp < buflim)
						*bp++ = c;
				}
				*bp++ = c;
			}
			copylev = 0;
			putgmac = quoteit = FALSE;
			continue;
		}

		if (c == '>')
		{
			if (anglelev > 0)
			{
				anglelev--;
				if (!skipping)
				{
					realanglelev--;
					buflim++;
				}
			}
			else if (!skipping)
			{
				/* syntax error: unmatched > */
				if (copylev > 0)
					bp--;
				quoteit = TRUE;
				continue;
			}
			if (copylev++ <= 0)
				*bp++ = c;
			continue;
		}

		/* must be a real address character */
	putg:
		if (copylev <= 0 && !putgmac)
		{
			*bp++ = MACROEXPAND;
			*bp++ = 'g';
			putgmac = TRUE;
		}
	}

	/* repair any syntactic damage */
	if (realqmode)
		*bp++ = '"';
	while (realcmtlev-- > 0)
		*bp++ = ')';
	while (realanglelev-- > 0)
		*bp++ = '>';
	*bp++ = '\0';

	if (tTd(33, 1))
		printf("crackaddr=>`%s'\n", buf);

	return (buf);
}
/*
**  PUTHEADER -- put the header part of a message from the in-core copy
**
**	Parameters:
**		mci -- the connection information.
**		e -- envelope to use.
**
**	Returns:
**		none.
**
**	Side Effects:
**		none.
*/

/*
 * Macro for fast max (not available in e.g. DG/UX, 386/ix).
 */
#ifndef MAX
# define MAX(a,b) (((a)>(b))?(a):(b))
#endif

putheader(mci, e)
	register MCI *mci;
	register ENVELOPE *e;
{
	char buf[MAX(MAXLINE,BUFSIZ)];
	register HDR *h;
	char obuf[MAXLINE];

	if (tTd(34, 1))
		printf("--- putheader, mailer = %s ---\n",
			mci->mci_mailer->m_name);

	for (h = e->e_header; h != NULL; h = h->h_link)
	{
		register char *p;
		extern bool bitintersect();

		if (tTd(34, 11))
		{
			printf("  %s: ", h->h_field);
			xputs(h->h_value);
		}

		if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
		    !bitintersect(h->h_mflags, mci->mci_mailer->m_flags))
		{
			if (tTd(34, 11))
				printf(" (skipped)\n");
			continue;
		}

		/* handle Resent-... headers specially */
		if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
		{
			if (tTd(34, 11))
				printf(" (skipped (resent))\n");
			continue;
		}

		/* suppress return receipts if requested */
		if (bitset(H_RECEIPTTO, h->h_flags) &&
		    bitset(EF_NORECEIPT, e->e_flags))
		{
			if (tTd(34, 11))
				printf(" (skipped (receipt))\n");
			continue;
		}

		/* macro expand value if generated internally */
		p = h->h_value;
		if (bitset(H_DEFAULT, h->h_flags))
		{
			expand(p, buf, &buf[sizeof buf], e);
			p = buf;
			if (p == NULL || *p == '\0')
			{
				if (tTd(34, 11))
					printf(" (skipped -- null value)\n");
				continue;
			}
		}

		if (tTd(34, 11))
			printf("\n");

		if (bitset(H_FROM|H_RCPT, h->h_flags))
		{
			/* address field */
			bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);

			if (bitset(H_FROM, h->h_flags))
				oldstyle = FALSE;
			commaize(h, p, oldstyle, mci, e);
		}
		else
		{
			/* vanilla header line */
			register char *nlp;

			(void) sprintf(obuf, "%s: ", h->h_field);
			while ((nlp = strchr(p, '\n')) != NULL)
			{
				*nlp = '\0';
				(void) strcat(obuf, p);
				*nlp = '\n';
				putline(obuf, mci);
				p = ++nlp;
				obuf[0] = '\0';
			}
			(void) strcat(obuf, p);
			putline(obuf, mci);
		}
	}
}
/*
**  COMMAIZE -- output a header field, making a comma-translated list.
**
**	Parameters:
**		h -- the header field to output.
**		p -- the value to put in it.
**		oldstyle -- TRUE if this is an old style header.
**		mci -- the connection information.
**		e -- the envelope containing the message.
**
**	Returns:
**		none.
**
**	Side Effects:
**		outputs "p" to file "fp".
*/

void
commaize(h, p, oldstyle, mci, e)
	register HDR *h;
	register char *p;
	bool oldstyle;
	register MCI *mci;
	register ENVELOPE *e;
{
	register char *obp;
	int opos;
	int omax;
	bool firstone = TRUE;
	char obuf[MAXLINE + 3];

	/*
	**  Output the address list translated by the
	**  mailer and with commas.
	*/

	if (tTd(14, 2))
		printf("commaize(%s: %s)\n", h->h_field, p);

	obp = obuf;
	(void) sprintf(obp, "%s: ", h->h_field);
	opos = strlen(h->h_field) + 2;
	obp += opos;
	omax = mci->mci_mailer->m_linelimit - 2;
	if (omax < 0 || omax > 78)
		omax = 78;

	/*
	**  Run through the list of values.
	*/

	while (*p != '\0')
	{
		register char *name;
		register int c;
		char savechar;
		int flags;
		auto int stat;

		/*
		**  Find the end of the name.  New style names
		**  end with a comma, old style names end with
		**  a space character.  However, spaces do not
		**  necessarily delimit an old-style name -- at
		**  signs mean keep going.
		*/

		/* find end of name */
		while ((isascii(*p) && isspace(*p)) || *p == ',')
			p++;
		name = p;
		for (;;)
		{
			auto char *oldp;
			char pvpbuf[PSBUFSIZE];

			(void) prescan(p, oldstyle ? ' ' : ',', pvpbuf,
				       sizeof pvpbuf, &oldp);
			p = oldp;

			/* look to see if we have an at sign */
			while (*p != '\0' && isascii(*p) && isspace(*p))
				p++;

			if (*p != '@')
			{
				p = oldp;
				break;
			}
			p += *p == '@' ? 1 : 2;
			while (*p != '\0' && isascii(*p) && isspace(*p))
				p++;
		}
		/* at the end of one complete name */

		/* strip off trailing white space */
		while (p >= name &&
		       ((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
			p--;
		if (++p == name)
			continue;
		savechar = *p;
		*p = '\0';

		/* translate the name to be relative */
		flags = RF_HEADERADDR|RF_ADDDOMAIN;
		if (bitset(H_FROM, h->h_flags))
			flags |= RF_SENDERADDR;
		stat = EX_OK;
		name = remotename(name, mci->mci_mailer, flags, &stat, e);
		if (*name == '\0')
		{
			*p = savechar;
			continue;
		}

		/* output the name with nice formatting */
		opos += strlen(name);
		if (!firstone)
			opos += 2;
		if (opos > omax && !firstone)
		{
			(void) strcpy(obp, ",\n");
			putline(obuf, mci);
			obp = obuf;
			(void) strcpy(obp, "        ");
			opos = strlen(obp);
			obp += opos;
			opos += strlen(name);
		}
		else if (!firstone)
		{
			(void) strcpy(obp, ", ");
			obp += 2;
		}

		while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
			*obp++ = c;
		firstone = FALSE;
		*p = savechar;
	}
	(void) strcpy(obp, "\n");
	putline(obuf, mci);
}
/*
**  COPYHEADER -- copy header list
**
**	This routine is the equivalent of newstr for header lists
**
**	Parameters:
**		header -- list of header structures to copy.
**
**	Returns:
**		a copy of 'header'.
**
**	Side Effects:
**		none.
*/

HDR *
copyheader(header)
	register HDR *header;
{
	register HDR *newhdr;
	HDR *ret;
	register HDR **tail = &ret;

	while (header != NULL)
	{
		newhdr = (HDR *) xalloc(sizeof(HDR));
		STRUCTCOPY(*header, *newhdr);
		*tail = newhdr;
		tail = &newhdr->h_link;
		header = header->h_link;
	}
	*tail = NULL;
	
	return ret;
}