| rsc | d709423 | 2003-11-23 18:23:20 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <ip.h> |
| 4 | |
| 5 | char* |
| 6 | v4parseip(uchar *to, char *from) |
| 7 | { |
| 8 | int i; |
| 9 | char *p; |
| 10 | |
| 11 | p = from; |
| 12 | for(i = 0; i < 4 && *p; i++){ |
| 13 | to[i] = strtoul(p, &p, 0); |
| 14 | if(*p == '.') |
| 15 | p++; |
| 16 | } |
| 17 | switch(CLASS(to)){ |
| 18 | case 0: /* class A - 1 uchar net */ |
| 19 | case 1: |
| 20 | if(i == 3){ |
| 21 | to[3] = to[2]; |
| 22 | to[2] = to[1]; |
| 23 | to[1] = 0; |
| 24 | } else if (i == 2){ |
| 25 | to[3] = to[1]; |
| 26 | to[1] = 0; |
| 27 | } |
| 28 | break; |
| 29 | case 2: /* class B - 2 uchar net */ |
| 30 | if(i == 3){ |
| 31 | to[3] = to[2]; |
| 32 | to[2] = 0; |
| 33 | } |
| 34 | break; |
| 35 | } |
| 36 | return p; |
| 37 | } |
| 38 | |
| 39 | ulong |
| 40 | parseip(uchar *to, char *from) |
| 41 | { |
| 42 | int i, elipsis = 0, v4 = 1; |
| 43 | ulong x; |
| 44 | char *p, *op; |
| 45 | |
| 46 | memset(to, 0, IPaddrlen); |
| 47 | p = from; |
| 48 | for(i = 0; i < 16 && *p; i+=2){ |
| 49 | op = p; |
| 50 | x = strtoul(p, &p, 16); |
| 51 | if(*p == '.' || (*p == 0 && i == 0)){ |
| 52 | p = v4parseip(to+i, op); |
| 53 | i += 4; |
| 54 | break; |
| 55 | } |
| 56 | to[i] = x>>8; |
| 57 | to[i+1] = x; |
| 58 | if(*p == ':'){ |
| 59 | v4 = 0; |
| 60 | if(*++p == ':'){ |
| 61 | elipsis = i+2; |
| 62 | p++; |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | if(i < 16){ |
| 67 | memmove(&to[elipsis+16-i], &to[elipsis], i-elipsis); |
| 68 | memset(&to[elipsis], 0, 16-i); |
| 69 | } |
| 70 | if(v4){ |
| 71 | to[10] = to[11] = 0xff; |
| 72 | return nhgetl(to+12); |
| 73 | } else |
| 74 | return 6; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * hack to allow ip v4 masks to be entered in the old |
| 79 | * style |
| 80 | */ |
| 81 | ulong |
| 82 | parseipmask(uchar *to, char *from) |
| 83 | { |
| 84 | ulong x; |
| 85 | int i; |
| 86 | uchar *p; |
| 87 | |
| 88 | if(*from == '/'){ |
| 89 | /* as a number of prefix bits */ |
| 90 | i = atoi(from+1); |
| 91 | if(i < 0) |
| 92 | i = 0; |
| 93 | if(i > 128) |
| 94 | i = 128; |
| 95 | memset(to, 0, IPaddrlen); |
| 96 | for(p = to; i >= 8; i -= 8) |
| 97 | *p++ = 0xff; |
| 98 | if(i > 0) |
| 99 | *p = ~((1<<(8-i))-1); |
| 100 | x = nhgetl(to+IPv4off); |
| 101 | } else { |
| 102 | /* as a straight bit mask */ |
| 103 | x = parseip(to, from); |
| 104 | if(memcmp(to, v4prefix, IPv4off) == 0) |
| 105 | memset(to, 0xff, IPv4off); |
| 106 | } |
| 107 | return x; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * parse a v4 ip address/mask in cidr format |
| 112 | */ |
| 113 | char* |
| 114 | v4parsecidr(uchar *addr, uchar *mask, char *from) |
| 115 | { |
| 116 | int i; |
| 117 | char *p; |
| 118 | uchar *a; |
| 119 | |
| 120 | p = v4parseip(addr, from); |
| 121 | |
| 122 | if(*p == '/'){ |
| 123 | /* as a number of prefix bits */ |
| 124 | i = strtoul(p+1, &p, 0); |
| 125 | if(i > 32) |
| 126 | i = 32; |
| 127 | memset(mask, 0, IPv4addrlen); |
| 128 | for(a = mask; i >= 8; i -= 8) |
| 129 | *a++ = 0xff; |
| 130 | if(i > 0) |
| 131 | *a = ~((1<<(8-i))-1); |
| 132 | } else |
| 133 | memcpy(mask, defmask(addr), IPv4addrlen); |
| 134 | return p; |
| 135 | } |
