srvrsmtp.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 743 行 · 第 1/2 页

			**  Arrange to send to everyone.
			**
			**  A note on error handling:
			**	Originally, sendmail did not mail back errors
			**	which ocurred during address verification.
			**	This code does.
			**
			**	Since we returned a 250 in the Rcpt To:
			**	for an address which contained potentially
			**	bad addresses, we must honor EF_FATALERRS 
			**	and mail back an error message.
			*/

			SmtpPhase = "delivery";
			if (CurEnv->e_nrcpts != 1)
			{
				HoldErrs = TRUE;
				ErrorMode = EM_MAIL;
			}

			/* send to all recipients */
			sendall(CurEnv, SM_DEFAULT);
			CurEnv->e_to = NULL;

			/* save statistics */
			markstats(CurEnv, (ADDRESS *) NULL);

			/* issue success if appropriate and reset */
			if (Errors == 0 || HoldErrs)
				message("250", "Ok");

			/*
			 * Was there an error expanding the alias?
			 * If so, make sure we mail it back.
			 */
			 if (aliaserror)
				CurEnv->e_flags |= EF_FATALERRS;

			/* if in a child, pop back to our parent */
			if (InChild)
				finis();

			/* clean up a bit */
			hasmail = 0;
			dropenvelope(CurEnv);
			CurEnv = newenvelope(CurEnv);
			CurEnv->e_flags = BlankEnvelope.e_flags;
			break;

		  case CMDRSET:		/* rset -- reset state */
			message("250", "Reset state");
			if (InChild)
				finis();
			break;

		  case CMDVRFY:		/* vrfy -- verify address */
			if (runinchild("SMTP-VRFY") > 0)
				break;
			setproctitle("%s: %s", CurHostName, inp);
			vrfyqueue = NULL;
			QuickAbort = TRUE;
			sendtolist(p, (ADDRESS *) NULL, &vrfyqueue);
			if (Errors != 0)
			{
				if (InChild)
					finis();
				break;
			}
			while (vrfyqueue != NULL)
			{
				register ADDRESS *a = vrfyqueue->q_next;
				char *code;

				while (a != NULL && bitset(QDONTSEND|QBADADDR, a->q_flags))
					a = a->q_next;

				if (!bitset(QDONTSEND|QBADADDR, vrfyqueue->q_flags))
				{
					if (a != NULL)
						code = "250-";
					else
						code = "250";
					if (vrfyqueue->q_fullname == NULL)
						message(code, "<%s>", vrfyqueue->q_paddr);
					else
						message(code, "%s <%s>",
						    vrfyqueue->q_fullname, vrfyqueue->q_paddr);
				}
				else if (a == NULL)
					message("554", "Self destructive alias loop");
				vrfyqueue = a;
			}
			if (InChild)
				finis();
			break;

		  case CMDHELP:		/* help -- give user info */
			if (*p == '\0')
				p = "SMTP";
			help(p);
			break;

		  case CMDNOOP:		/* noop -- do nothing */
			message("200", "OK");
			break;

		  case CMDQUIT:		/* quit -- leave mail */
			message("221", "%s closing connection", MyHostName);
			if (InChild)
				ExitStat = EX_QUIT;
			finis();

		  case CMDVERB:		/* set verbose mode */
			Verbose = TRUE;
			SendMode = SM_DELIVER;
			message("200", "Verbose mode");
			break;

		  case CMDONEX:		/* doing one transaction only */
			OneXact = TRUE;
			message("200", "Only one transaction");
			break;

# ifdef DEBUG
		  case CMDDBGQSHOW:	/* show queues */
			printf("Send Queue=");
			printaddr(CurEnv->e_sendqueue, TRUE);
			break;

		  case CMDDBGDEBUG:	/* set debug mode */
			tTsetup(tTdvect, sizeof tTdvect, "0-99.1");
			tTflag(p);
			message("200", "Debug set");
			break;
# endif DEBUG

# ifdef WIZ
		  case CMDDBGKILL:	/* kill the parent */
			if (!iswiz())
				break;
			if (kill(MotherPid, SIGTERM) >= 0)
				message("200", "Mother is dead");
			else
				message("500", "Can't kill Mom");
			break;

		  case CMDDBGWIZ:	/* become a wizard */
			if (WizWord != NULL)
			{
				char seed[3];
				extern char *crypt();

				(void) strncpy(seed, WizWord, 2);
				if (strcmp(WizWord, crypt(p, seed)) == 0)
				{
					IsWiz = TRUE;
					message("200", "Please pass, oh mighty wizard");
					break;
				}
			}
			message("500", "You are no wizard!");
			break;

# else WIZ
		  case CMDDBGWIZ:	/* try to become a wizard */
			message("500", "You wascal wabbit!  Wandering wizards won't win!");
			break;
# endif WIZ

		  case CMDERROR:	/* unknown command */
			message("500", "Command unrecognized");
			break;

		  default:
			syserr("smtp: unknown code %d", c->cmdcode);
			break;
		}
	}
}
/*
**  SKIPWORD -- skip a fixed word.
**
**	Parameters:
**		p -- place to start looking.
**		w -- word to skip.
**
**	Returns:
**		p following w.
**		NULL on error.
**
**	Side Effects:
**		clobbers the p data area.
*/

static char *
skipword(p, w)
	register char *p;
	char *w;
{
	register char *q;
	extern bool sameword();

	/* find beginning of word */
	while (isspace(*p))
		p++;
	q = p;

	/* find end of word */
	while (*p != '\0' && *p != ':' && !isspace(*p))
		p++;
	while (isspace(*p))
		*p++ = '\0';
	if (*p != ':')
	{
	  syntax:
		message("501", "Syntax error");
		Errors++;
		return (NULL);
	}
	*p++ = '\0';
	while (isspace(*p))
		p++;

	/* see if the input word matches desired word */
	if (!sameword(q, w))
		goto syntax;

	return (p);
}
/*
**  HELP -- implement the HELP command.
**
**	Parameters:
**		topic -- the topic we want help for.
**
**	Returns:
**		none.
**
**	Side Effects:
**		outputs the help file to message output.
*/

help(topic)
	char *topic;
{
	register FILE *hf;
	int len;
	char buf[MAXLINE];
	bool noinfo;

	if (HelpFile == NULL || (hf = fopen(HelpFile, "r")) == NULL)
	{
		/* no help */
		errno = 0;
		message("502", "HELP not implemented");
		return;
	}

	len = strlen(topic);
	makelower(topic);
	noinfo = TRUE;

	while (fgets(buf, sizeof buf, hf) != NULL)
	{
		if (strncmp(buf, topic, len) == 0)
		{
			register char *p;

			p = index(buf, '\t');
			if (p == NULL)
				p = buf;
			else
				p++;
			fixcrlf(p, TRUE);
			message("214-", p);
			noinfo = FALSE;
		}
	}

	if (noinfo)
		message("504", "HELP topic unknown");
	else
		message("214", "End of HELP info");
	(void) fclose(hf);
}
/*
**  ISWIZ -- tell us if we are a wizard
**
**	If not, print a nasty message.
**
**	Parameters:
**		none.
**
**	Returns:
**		TRUE if we are a wizard.
**		FALSE if we are not a wizard.
**
**	Side Effects:
**		Prints a 500 exit stat if we are not a wizard.
*/

#ifdef WIZ

bool
iswiz()
{
	if (!IsWiz)
		message("500", "Mere mortals musn't mutter that mantra");
	return (IsWiz);
}

#endif WIZ
/*
**  RUNINCHILD -- return twice -- once in the child, then in the parent again
**
**	Parameters:
**		label -- a string used in error messages
**
**	Returns:
**		zero in the child
**		one in the parent
**
**	Side Effects:
**		none.
*/

runinchild(label)
	char *label;
{
	int childpid;

	if (!OneXact)
	{
		childpid = dofork();
		if (childpid < 0)
		{
			syserr("%s: cannot fork", label);
			return (1);
		}
		if (childpid > 0)
		{
			auto int st;

			/* parent -- wait for child to complete */
			st = waitfor(childpid);
			if (st == -1)
				syserr("%s: lost child", label);

			/* if we exited on a QUIT command, complete the process */
			if (st == (EX_QUIT << 8))
				finis();

			return (1);
		}
		else
		{
			/* child */
			InChild = TRUE;
			QuickAbort = FALSE;
			clearenvelope(CurEnv, FALSE);
		}
	}

	/* open alias database */
	initaliases(AliasFile, FALSE);

	return (0);
}

# endif SMTP