72 lines
1.8 KiB
Awk
72 lines
1.8 KiB
Awk
# AWK script to convert iblocklist.com ranges into CIDR format
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# usable with ipset
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# based on scripts posted at
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# http://www.unix.com/shell-programming-and-scripting/233825-convert-ip-ranges-cidr-netblocks.html
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function bit_or(a, b, r, i, c) {
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for (r=i=0;i<32;i++) {
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c = 2 ^ i
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if ((int(a/c) % 2) || (int(b/c) % 2)) r += c
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}
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return r
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}
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function bit_lshift(var, x) {
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while(x--) var*=2;
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return var;
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}
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function bit_rshift(var, x) {
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while(x--) var=int(var/2);
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return var;
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}
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function range2cidr(ipStart, ipEnd, bits, mask, newip) {
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bits = 1
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mask = 1
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while (bits < 32) {
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newip = bit_or(ipStart, mask)
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if ((newip>ipEnd) || ((bit_lshift(bit_rshift(ipStart,bits),bits)) != ipStart)) {
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bits--
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mask = bit_rshift(mask,1)
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break
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}
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bits++
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mask = bit_lshift(mask,1)+1
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}
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newip = bit_or(ipStart, mask)
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bits = 32 - bits
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result = dec2ip(ipStart) "/" bits
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if (newip < ipEnd) result = result "\n" range2cidr(newip + 1, ipEnd)
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return result
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}
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function ip2dec(ip, slice) {
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split(ip, slice, ".")
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return (slice[1] * 2^24) + (slice[2] * 2^16) + (slice[3] * 2^8) + slice[4]
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}
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function dec2ip(dec, ip, quad) {
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for (i=3; i>=1; i--) {
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quad = 256^i
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ip = ip int(dec/quad) "."
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dec = dec%quad
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}
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return ip dec
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}
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# example iblocklist.com format
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# TOT Public Company/Irdeto:1.0.128.0-1.0.255.255
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BEGIN { FS = ":"; }
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$2 ~ /^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+-[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$/ {
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n = split($2, array, "-");
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if (n == 2) {
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ip1 = array[1];
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ip2 = array[2];
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if (ip1 == ip2) {
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# some records are just single IPs listed as range
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print ip1;
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} else {
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# and some are really ranges
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print range2cidr(ip2dec(ip1), ip2dec(ip2));
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}
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}
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}
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