276da39af9
Approved by: roberto, delphij Security: VuXML: 0d0f3050-1f69-11e5-9ba9-d050996490d0 Security: http://bugs.ntp.org/show_bug.cgi?id=2853 Security: https://www.kb.cert.org/vuls/id/668167 Security: http://support.ntp.org/bin/view/Main/SecurityNotice#June_2015_NTP_Security_Vulnerabi
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
#include <config.h>
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#include <ntp.h>
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#include <ntp_fp.h>
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#include <refidsmear.h>
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/*
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* we want to test a refid format of:
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* 254.x.y.x
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*
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* where x.y.z are 24 bits containing 2 (signed) integer bits
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* and 22 fractional bits.
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*
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*/
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l_fp
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convertRefIDToLFP(uint32_t r)
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{
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l_fp temp;
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r = ntohl(r);
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// printf("%03d %08x: ", (r >> 24) & 0xFF, (r & 0x00FFFFFF) );
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temp.l_uf = (r << 10); /* 22 fractional bits */
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temp.l_ui = (r >> 22) & 0x3;
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temp.l_ui |= ~(temp.l_ui & 2) + 1;
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return temp;
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}
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uint32_t
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convertLFPToRefID(l_fp num)
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{
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uint32_t temp;
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/* round the input with the highest bit to shift out from the
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* fraction, then keep just two bits from the integral part.
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*
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* TODO: check for overflows; should we clamp/saturate or just
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* complain?
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*/
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L_ADDUF(&num, 0x200);
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num.l_ui &= 3;
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/* combine integral and fractional part to 24 bits */
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temp = (num.l_ui << 22) | (num.l_uf >> 10);
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/* put in the leading 254.0.0.0 */
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temp |= UINT32_C(0xFE000000);
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// printf("%03d %08x: ", (temp >> 24) & 0xFF, (temp & 0x00FFFFFF) );
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return htonl(temp);
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}
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