main.c

操作系统SunOS 4.1.3版本的源码

    int  putToFile;
{
    char	host[NAME_LEN];
    char	file[NAME_LEN];
    int		result;

    /*
     *  Invalidate the current host information to prevent Finger 
     *  from using bogus info.
     */

    curHostValid = FALSE;

    /*
     *	 Parse the command string into the host and
     *	 optional output file name.
     *
     */

    sscanf(string, " %s", host);	/* removes white space */
    if (!putToFile) {
	filePtr = stdout;
    } else {
	filePtr = OpenFile(string, file);
	if (filePtr == NULL) {
	    fprintf(stderr, "*** Can't open %s for writing\n", file);
	    return(ERROR);
	}
	fprintf(filePtr,"> %s\n", string);
    }

    PrintHostInfo(filePtr, "Server:", defaultPtr);

    /*
     *  Check to see if we have the address of the server or the
     *	address of a server who knows about this domain.
     *
     *  For now, just use the first address in the list.
     */

    if (defaultPtr->addrList == NULL) {
	result = GetHostInfo(
		    (struct in_addr *) defaultPtr->servers[0]->addrList[0], 
			  queryClass, queryType, host, &curHostInfo, 0);
    } else {
	result = GetHostInfo((struct in_addr *) defaultPtr->addrList[0], 
			  queryClass, queryType, host, &curHostInfo, 0);
    }

    switch(result) {
	case SUCCESS:
	    /*
	     *  If the query was for an address, then the curHostInfo
	     *  variable can be used by Finger.
	     *  There's no need to print anything for other query types
	     *  because the info has already been printed.
	     */
	    if (queryType == T_A) {
		curHostValid = TRUE;
		PrintHostInfo(filePtr, "Name:", &curHostInfo);
	    }
	    break;

	/*
	 * No Authoritative answer was available but we got names
	 * of servers who know about the host.
	 */
	case NONAUTH:
	    PrintHostInfo(filePtr, "Name:", &curHostInfo);
	    break;

	case NO_INFO:
	    fprintf(stderr, "*** No %s information is available for %s\n", 
			DecodeType(queryType), host);
	    break;

	case TIME_OUT:
	    fprintf(stderr, "*** Request to %s timed-out\n", defaultServer);
	    break;

	default:
	    fprintf(stderr, "*** %s can't find %s: %s\n", defaultServer, host,
		    DecodeError(result));
    }
    if (putToFile) {
	fclose(filePtr);
	filePtr = NULL;
    }
    return(result);
}

/*
 *******************************************************************************
 *
 *  LookupHostWithServer --
 *
 *	Asks the name server specified in the second argument for 
 *	information about the host or domain specified in the first
 *	argument. The information is printed if the lookup was successful.
 *
 *	Address info about the requested name server is obtained
 *	from the default name server. This routine will return an
 *	error if the default server doesn't have info about the 
 *	requested server. Thus an error return status might not
 *	mean the requested name server doesn't have info about the
 *	requested host.
 *
 *	Comments from LookupHost apply here, too.
 *
 *  Results:
 *	SUCCESS		- the lookup was successful.
 *	ERROR		- the output file could not be opened.
 *	Misc. Errors	- an error message is printed if the lookup failed.
 *
 *******************************************************************************
 */

int
LookupHostWithServer(string, putToFile)
    char *string;
    int  putToFile;
{
    char 	file[NAME_LEN];
    char 	host[NAME_LEN];
    char 	server[NAME_LEN];
    int 	result;
    static HostInfo serverInfo;

    curHostValid = FALSE;

    sscanf(string, " %s %s", host, server);
    if (!putToFile) {
	filePtr = stdout;
    } else {
	filePtr = OpenFile(string, file);
	if (filePtr == NULL) {
	    fprintf(stderr, "*** Can't open %s for writing\n", file);
	    return(ERROR);
	}
	fprintf(filePtr,"> %s\n", string);
    }
    

    if (defaultPtr->addrList == NULL) {
	result = GetHostInfo(
			(struct in_addr *) defaultPtr->servers[0]->addrList[0], 
				C_IN, T_A, server, &serverInfo, 1);
    } else {
	result = GetHostInfo((struct in_addr *) defaultPtr->addrList[0], 
				C_IN, T_A, server, &serverInfo, 1);
    }

    if (result != SUCCESS) {
	fprintf(stderr,"*** Can't find address for server %s: %s\n", server,
		 DecodeError(result));
    } else {
	PrintHostInfo(filePtr, "Server:", &serverInfo);

	if (serverInfo.addrList == NULL) {
	    result = GetHostInfo(
			(struct in_addr *) serverInfo.servers[0]->addrList[0], 
			      queryClass, queryType, host, &curHostInfo, 0);
	} else {
	    result = GetHostInfo((struct in_addr *) serverInfo.addrList[0], 
			      queryClass, queryType, host, &curHostInfo, 0);
	}


	switch(result) {

	    case SUCCESS:
		if (queryType == T_A) {
		    curHostValid = TRUE;
		    PrintHostInfo(filePtr, "Name:", &curHostInfo);
		}
		break;

	    case NONAUTH:
		PrintHostInfo(filePtr, "Name:", &curHostInfo);
		break;

	    case NO_INFO:
		fprintf(stderr, "*** No %s information is available for %s\n", 
			DecodeType(queryType), host);
		break;

	    case TIME_OUT:
		fprintf(stderr, "*** Request to %s timed-out\n", server);
		break;

	    default:
		fprintf(stderr, "*** %s can't find %s: %s\n", server, host,
			DecodeError(result));
	}
    }
    if (putToFile) {
	fclose(filePtr);
	filePtr = NULL;
    }
    return(result);
}

/*
 *******************************************************************************
 *
 *  SetOption -- 
 *
 *	This routine is used to change the state information
 *	that affect the lookups. The command format is
 *	   set keyword[=value]
 *	Most keywords can be abbreviated. Parsing is very simplistic--
 *	A value must not be separated from its keyword by white space.
 *
 *	Valid keywords:		Meaning:
 *	[no]aaonly	  	authoritative query only or not (hidden).
 *	all			lists current values of options.
 *	ALL			lists current values of options, including
 *				  hidden options.
 *	[no]d2			turn on/off extra debugging mode (hidden).
 *	[no]debug 		turn on/off debugging mode.
 *	[no]defname	  	use/don't use default domain name.
 *	[no]search		use/don't use domain search list.
 *	domain=NAME		set default domain name to NAME.
 *	[no]ignore		ignore/don't ignore trunc. errors (hidden).
 *	[no]primary 		use/don't use primary server (hidden).
 *	query=value		set default query type to value,
 *				value is one of the query types in RFC883
 *				without the leading T_.	(e.g. A, HINFO)
 *	[no]recurse		use/don't use recursive lookup.
 *	retry=#			set number of retries to #.
 *	root=NAME		change root server to NAME.
 *	time=#			set timeout length to #.
 *	[no]vc			use/don't use virtual circuit.
 *
 *  Results:
 *	SUCCESS		the command was parsed correctly.
 *	ERROR		the command was not parsed correctly.
 *
 *******************************************************************************
 */

int
SetOption(string)
    char *string;
{
    char 	option[NAME_LEN];
    char 	type[NAME_LEN];
    char 	*ptr;
    int 	i;

    i = sscanf(string, " set %s", option);
    if (i != 1) {
	fprintf(stderr, "*** Invalid option: %s\n",  option);
	return(ERROR);
    } else {
	if (strncmp(option, "all", 3) == 0) {
	    ShowOptions(FALSE);
	} else if (strncmp(option, "ALL", 3) == 0) {
	    ShowOptions(TRUE);
	} else if (strncmp(option, "aa", 2) == 0) {	/* aaonly */
	    _res.options |= RES_AAONLY;
	} else if (strncmp(option, "noaa", 4) == 0) {
	    _res.options &= ~RES_AAONLY;
	} else if (strncmp(option, "deb", 3) == 0) {	/* debug */
	    _res.options |= RES_DEBUG;
	} else if (strncmp(option, "nodeb", 5) == 0) {
	    _res.options &= ~(RES_DEBUG | RES_DEBUG2);
	} else if (strncmp(option, "d2", 2) == 0) {	/* d2 (more debug) */
	    _res.options |= (RES_DEBUG | RES_DEBUG2);
	} else if (strncmp(option, "nod2", 4) == 0) {
	    _res.options &= ~RES_DEBUG2;
	} else if (strncmp(option, "def", 3) == 0) {	/* defname */
	    _res.options |= RES_DEFNAMES;
	} else if (strncmp(option, "nodef", 5) == 0) {
	    _res.options &= ~RES_DEFNAMES;
	} else if (strncmp(option, "sea", 3) == 0) {	/* search list */
	    _res.options |= RES_DNSRCH;
	} else if (strncmp(option, "nosea", 5) == 0) {
	    _res.options &= ~RES_DNSRCH;
	} else if (strncmp(option, "do", 2) == 0) {	/* domain */
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%s", _res.defdname);
		res_re_init();
	    }
	} else if (strncmp(option, "i", 1) == 0) {	/* ignore */
	    _res.options |= RES_IGNTC;
	} else if (strncmp(option, "noi", 3) == 0) {
	    _res.options &= ~RES_IGNTC;
	} else if (strncmp(option, "p", 1) == 0) {	/* primary */
	    _res.options |= RES_PRIMARY;
	} else if (strncmp(option, "nop", 3) == 0) {
	    _res.options &= ~RES_PRIMARY;
	} else if (strncmp(option, "q", 1) == 0 ||	/* querytype */
	  strncmp(option, "ty", 2) == 0) {
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%s", type);
		queryType = StringToType(type, queryType);
	    }
	} else if (strncmp(option, "cl", 2) == 0) {	/* query class */
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%s", type);
		queryClass = StringToClass(type, queryClass);
	    }
	} else if (strncmp(option, "rec", 3) == 0) {	/* recurse */
	    _res.options |= RES_RECURSE;
	} else if (strncmp(option, "norec", 5) == 0) {
	    _res.options &= ~RES_RECURSE;
	} else if (strncmp(option, "ret", 3) == 0) {	/* retry */
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%d", &_res.retry);
	    }
	} else if (strncmp(option, "ro", 2) == 0) {	/* root */
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%s", rootServerName);
	    }
	} else if (strncmp(option, "t", 1) == 0) {	/* timeout */
	    ptr = index(option, '=');
	    if (ptr != NULL) {
		sscanf(++ptr, "%d", &_res.retrans);
	    }
	} else if (strncmp(option, "v", 1) == 0) {	/* vc */
	    _res.options |= RES_USEVC;
	} else if (strncmp(option, "nov", 3) == 0) {
	    _res.options &= ~RES_USEVC;
	} else {
	    fprintf(stderr, "*** Invalid option: %s\n",  option);
	    return(ERROR);
	}
    }
    return(SUCCESS);
}

/*
 * Fake a reinitialization when the domain is changed.
 */
res_re_init()
{
    register char *cp, **pp;
    int n;

    /* find components of local domain that might be searched */
    pp = _res.dnsrch;
    *pp++ = _res.defdname;
    for (cp = _res.defdname, n = 0; *cp; cp++)
	if (*cp == '.')
	    n++;
    cp = _res.defdname;
    for (; n >= LOCALDOMAINPARTS && pp < _res.dnsrch + MAXDNSRCH; n--) {
	cp = index(cp, '.');
	*pp++ = ++cp;
    }
    *pp = 0;
    _res.options |= RES_INIT;
}

/*
 *******************************************************************************
 *
 *  ShowOptions --
 *
 *	Prints out the state information used by the resolver
 *	library and other options set by the user.
 *
 *******************************************************************************
 */

void
ShowOptions(special)
    int special;
{
    int i;
    register char **cp;

    PrintHostInfo(stdout, "Default Server:", defaultPtr);
    if (curHostValid) {
	PrintHostInfo(stdout, "Host:", &curHostInfo);
    }

    printf("Set options:\n");
    printf("  %sdebug  \t", (_res.options & RES_DEBUG) ? "" : "no");
    printf("  %sdefname\t", (_res.options & RES_DEFNAMES) ? "" : "no");
    printf("  %ssearch\t", (_res.options & RES_DNSRCH) ? "" : "no");
    printf("  %srecurse\t", (_res.options & RES_RECURSE) ? "" : "no");
    printf("  %svc\n", (_res.options & RES_USEVC) ? "" : "no");

    if (special) {
	printf("  %saa\t\t", (_res.options & RES_AAONLY) ? "" : "no");
	printf("  %sd2\t\t", (_res.options & RES_DEBUG2) ? "" : "no");
	printf("  %signoretc\t", (_res.options & RES_IGNTC) ? "" : "no");
	printf("  %sprimary\n", (_res.options & RES_PRIMARY) ? "" : "no");
    }

    printf("  querytype=%s\t", p_type(queryType));
    printf("  class=%s\t", p_class(queryClass));
    printf("  timeout=%d\t", _res.retrans);
    printf("  retry=%d\n", _res.retry);
    printf("  domain=%s\n", _res.defdname);
    printf("  search list: ");
    for (cp = _res.dnsrch; *cp; cp++)
	printf("%s ", *cp);
    printf("\n  root=%s\n", rootServerName);

    if (special) {
	printf("\n");
	printf("State info:\n");
	printf("  current packet id:       %d\n", _res.id);
	printf("  number of name servers:  %d\n", _res.nscount);
	printf("  name server addresses:   %s\n",
				    inet_ntoa(_res.nsaddr_list[0].sin_addr));
	for (i = 1; i < _res.nscount; i++) {
	    printf("                           %s\n", 
		    inet_ntoa(_res.nsaddr_list[i].sin_addr));
	}
    }
}

/*
 *******************************************************************************
 *
 *  PrintHelp --
 *
 *	Prints out the help file.
*	(Code taken from Mail.)
 *
 *******************************************************************************
 */

void
PrintHelp()
{
	register int c;
	register FILE *helpFilePtr;

	if ((helpFilePtr = fopen(HELPFILE, "r")) == NULL) {
	    perror(HELPFILE);
	    return;
	} 
	while ((c = getc(helpFilePtr)) != EOF) {
	    putchar((char) c);
	}
	fclose(helpFilePtr);
}