vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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ipaux.c (1514B)

      1 #include "u.h"
      2 #include "lib.h"
      3 #include "ip.h"
      4 
      5 /*
      6  *  well known IP addresses
      7  */
      8 uchar IPv4bcast[IPaddrlen] = {
      9 	0, 0, 0, 0,
     10 	0, 0, 0, 0,
     11 	0, 0, 0xff, 0xff,
     12 	0xff, 0xff, 0xff, 0xff
     13 };
     14 uchar IPv4allsys[IPaddrlen] = {
     15 	0, 0, 0, 0,
     16 	0, 0, 0, 0,
     17 	0, 0, 0xff, 0xff,
     18 	0xe0, 0, 0, 0x01
     19 };
     20 uchar IPv4allrouter[IPaddrlen] = {
     21 	0, 0, 0, 0,
     22 	0, 0, 0, 0,
     23 	0, 0, 0xff, 0xff,
     24 	0xe0, 0, 0, 0x02
     25 };
     26 uchar IPallbits[IPaddrlen] = {
     27 	0xff, 0xff, 0xff, 0xff,
     28 	0xff, 0xff, 0xff, 0xff,
     29 	0xff, 0xff, 0xff, 0xff,
     30 	0xff, 0xff, 0xff, 0xff
     31 };
     32 uchar IPnoaddr[IPaddrlen];
     33 
     34 /*
     35  *  prefix of all v4 addresses
     36  */
     37 uchar v4prefix[IPaddrlen] = {
     38 	0, 0, 0, 0,
     39 	0, 0, 0, 0,
     40 	0, 0, 0xff, 0xff,
     41 	0, 0, 0, 0
     42 };
     43 
     44 int
     45 isv4(uchar *ip)
     46 {
     47 	return memcmp(ip, v4prefix, IPv4off) == 0;
     48 }
     49 
     50 /*
     51  *  the following routines are unrolled with no memset's to speed
     52  *  up the usual case
     53  */
     54 void
     55 v4tov6(uchar *v6, uchar *v4)
     56 {
     57 	v6[0] = 0;
     58 	v6[1] = 0;
     59 	v6[2] = 0;
     60 	v6[3] = 0;
     61 	v6[4] = 0;
     62 	v6[5] = 0;
     63 	v6[6] = 0;
     64 	v6[7] = 0;
     65 	v6[8] = 0;
     66 	v6[9] = 0;
     67 	v6[10] = 0xff;
     68 	v6[11] = 0xff;
     69 	v6[12] = v4[0];
     70 	v6[13] = v4[1];
     71 	v6[14] = v4[2];
     72 	v6[15] = v4[3];
     73 }
     74 
     75 int
     76 v6tov4(uchar *v4, uchar *v6)
     77 {
     78 	if(v6[0] == 0
     79 	&& v6[1] == 0
     80 	&& v6[2] == 0
     81 	&& v6[3] == 0
     82 	&& v6[4] == 0
     83 	&& v6[5] == 0
     84 	&& v6[6] == 0
     85 	&& v6[7] == 0
     86 	&& v6[8] == 0
     87 	&& v6[9] == 0
     88 	&& v6[10] == 0xff
     89 	&& v6[11] == 0xff)
     90 	{
     91 		v4[0] = v6[12];
     92 		v4[1] = v6[13];
     93 		v4[2] = v6[14];
     94 		v4[3] = v6[15];
     95 		return 0;
     96 	} else {
     97 		memset(v4, 0, 4);
     98 		if(memcmp(v6, IPnoaddr, IPaddrlen) == 0)
     99 			return 0;
    100 		return -1;
    101 	}
    102 }