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Annotation of 43BSDTahoe/etc/routed/af.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)af.c       5.8 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "defs.h"
        !            23: 
        !            24: /*
        !            25:  * Address family support routines
        !            26:  */
        !            27: int    inet_hash(), inet_netmatch(), inet_output(),
        !            28:        inet_portmatch(), inet_portcheck(),
        !            29:        inet_checkhost(), inet_rtflags(), inet_sendroute(), inet_canon();
        !            30: char   *inet_format();
        !            31: 
        !            32: #define NIL    { 0 }
        !            33: #define        INET \
        !            34:        { inet_hash,            inet_netmatch,          inet_output, \
        !            35:          inet_portmatch,       inet_portcheck,         inet_checkhost, \
        !            36:          inet_rtflags,         inet_sendroute,         inet_canon, \
        !            37:          inet_format \
        !            38:        }
        !            39: 
        !            40: struct afswitch afswitch[AF_MAX] = {
        !            41:        NIL,            /* 0- unused */
        !            42:        NIL,            /* 1- Unix domain, unused */
        !            43:        INET,           /* Internet */
        !            44: };
        !            45: 
        !            46: int af_max = sizeof(afswitch) / sizeof(afswitch[0]);
        !            47: 
        !            48: struct sockaddr_in inet_default = { AF_INET, INADDR_ANY };
        !            49: 
        !            50: inet_hash(sin, hp)
        !            51:        register struct sockaddr_in *sin;
        !            52:        struct afhash *hp;
        !            53: {
        !            54:        register u_long n;
        !            55: 
        !            56:        n = inet_netof(sin->sin_addr);
        !            57:        if (n)
        !            58:            while ((n & 0xff) == 0)
        !            59:                n >>= 8;
        !            60:        hp->afh_nethash = n;
        !            61:        hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
        !            62:        hp->afh_hosthash &= 0x7fffffff;
        !            63: }
        !            64: 
        !            65: inet_netmatch(sin1, sin2)
        !            66:        struct sockaddr_in *sin1, *sin2;
        !            67: {
        !            68: 
        !            69:        return (inet_netof(sin1->sin_addr) == inet_netof(sin2->sin_addr));
        !            70: }
        !            71: 
        !            72: /*
        !            73:  * Verify the message is from the right port.
        !            74:  */
        !            75: inet_portmatch(sin)
        !            76:        register struct sockaddr_in *sin;
        !            77: {
        !            78:        
        !            79:        return (sin->sin_port == sp->s_port);
        !            80: }
        !            81: 
        !            82: /*
        !            83:  * Verify the message is from a "trusted" port.
        !            84:  */
        !            85: inet_portcheck(sin)
        !            86:        struct sockaddr_in *sin;
        !            87: {
        !            88: 
        !            89:        return (ntohs(sin->sin_port) <= IPPORT_RESERVED);
        !            90: }
        !            91: 
        !            92: /*
        !            93:  * Internet output routine.
        !            94:  */
        !            95: inet_output(s, flags, sin, size)
        !            96:        int s, flags;
        !            97:        struct sockaddr_in *sin;
        !            98:        int size;
        !            99: {
        !           100:        struct sockaddr_in dst;
        !           101: 
        !           102:        dst = *sin;
        !           103:        sin = &dst;
        !           104:        if (sin->sin_port == 0)
        !           105:                sin->sin_port = sp->s_port;
        !           106:        if (sendto(s, packet, size, flags, sin, sizeof (*sin)) < 0)
        !           107:                perror("sendto");
        !           108: }
        !           109: 
        !           110: /*
        !           111:  * Return 1 if the address is believed
        !           112:  * for an Internet host -- THIS IS A KLUDGE.
        !           113:  */
        !           114: inet_checkhost(sin)
        !           115:        struct sockaddr_in *sin;
        !           116: {
        !           117:        u_long i = ntohl(sin->sin_addr.s_addr);
        !           118: 
        !           119: #ifndef IN_EXPERIMENTAL
        !           120: #define        IN_EXPERIMENTAL(i)      (((long) (i) & 0xe0000000) == 0xe0000000)
        !           121: #endif
        !           122: 
        !           123:        if (IN_EXPERIMENTAL(i) || sin->sin_port != 0)
        !           124:                return (0);
        !           125:        if (i != 0 && (i & 0xff000000) == 0)
        !           126:                return (0);
        !           127:        for (i = 0; i < sizeof(sin->sin_zero)/sizeof(sin->sin_zero[0]); i++)
        !           128:                if (sin->sin_zero[i])
        !           129:                        return (0);
        !           130:        return (1);
        !           131: }
        !           132: 
        !           133: inet_canon(sin)
        !           134:        struct sockaddr_in *sin;
        !           135: {
        !           136: 
        !           137:        sin->sin_port = 0;
        !           138: }
        !           139: 
        !           140: char *
        !           141: inet_format(sin)
        !           142:        struct sockaddr_in *sin;
        !           143: {
        !           144:        char *inet_ntoa();
        !           145: 
        !           146:        return (inet_ntoa(sin->sin_addr));
        !           147: }

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