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Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 1260 |
1 files changed, 1260 insertions, 0 deletions
@@ -0,0 +1,1260 @@ +/* + chronyd/chronyc - Programs for keeping computer clocks accurate. + + ********************************************************************** + * Copyright (C) Richard P. Curnow 1997-2003 + * Copyright (C) Miroslav Lichvar 2009, 2012-2018 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + ********************************************************************** + + ======================================================================= + + Various utility functions + */ + +#include "config.h" + +#include "sysincl.h" + +#include "logging.h" +#include "memory.h" +#include "util.h" +#include "hash.h" + +#define NSEC_PER_SEC 1000000000 + +/* ================================================== */ + +void +UTI_ZeroTimespec(struct timespec *ts) +{ + ts->tv_sec = 0; + ts->tv_nsec = 0; +} + +/* ================================================== */ + +int +UTI_IsZeroTimespec(struct timespec *ts) +{ + return !ts->tv_sec && !ts->tv_nsec; +} + +/* ================================================== */ + +void +UTI_TimevalToTimespec(struct timeval *tv, struct timespec *ts) +{ + ts->tv_sec = tv->tv_sec; + ts->tv_nsec = 1000 * tv->tv_usec; +} + +/* ================================================== */ + +void +UTI_TimespecToTimeval(struct timespec *ts, struct timeval *tv) +{ + tv->tv_sec = ts->tv_sec; + tv->tv_usec = ts->tv_nsec / 1000; +} + +/* ================================================== */ + +double +UTI_TimespecToDouble(struct timespec *ts) +{ + return ts->tv_sec + 1.0e-9 * ts->tv_nsec; +} + +/* ================================================== */ + +void +UTI_DoubleToTimespec(double d, struct timespec *ts) +{ + ts->tv_sec = d; + ts->tv_nsec = 1.0e9 * (d - ts->tv_sec); + UTI_NormaliseTimespec(ts); +} + +/* ================================================== */ + +void +UTI_NormaliseTimespec(struct timespec *ts) +{ + if (ts->tv_nsec >= NSEC_PER_SEC || ts->tv_nsec < 0) { + ts->tv_sec += ts->tv_nsec / NSEC_PER_SEC; + ts->tv_nsec = ts->tv_nsec % NSEC_PER_SEC; + + /* If seconds are negative nanoseconds would end up negative too */ + if (ts->tv_nsec < 0) { + ts->tv_sec--; + ts->tv_nsec += NSEC_PER_SEC; + } + } +} + +/* ================================================== */ + +double +UTI_TimevalToDouble(struct timeval *tv) +{ + return tv->tv_sec + 1.0e-6 * tv->tv_usec; +} + +/* ================================================== */ + +void +UTI_DoubleToTimeval(double a, struct timeval *b) +{ + double frac_part; + + b->tv_sec = a; + frac_part = 1.0e6 * (a - b->tv_sec); + b->tv_usec = frac_part > 0 ? frac_part + 0.5 : frac_part - 0.5; + UTI_NormaliseTimeval(b); +} + +/* ================================================== */ + +void +UTI_NormaliseTimeval(struct timeval *x) +{ + /* Reduce tv_usec to within +-1000000 of zero. JGH */ + if ((x->tv_usec >= 1000000) || (x->tv_usec <= -1000000)) { + x->tv_sec += x->tv_usec/1000000; + x->tv_usec = x->tv_usec%1000000; + } + + /* Make tv_usec positive. JGH */ + if (x->tv_usec < 0) { + --x->tv_sec; + x->tv_usec += 1000000; + } + +} + +/* ================================================== */ + +int +UTI_CompareTimespecs(struct timespec *a, struct timespec *b) +{ + if (a->tv_sec < b->tv_sec) + return -1; + if (a->tv_sec > b->tv_sec) + return 1; + if (a->tv_nsec < b->tv_nsec) + return -1; + if (a->tv_nsec > b->tv_nsec) + return 1; + return 0; +} + +/* ================================================== */ + +void +UTI_DiffTimespecs(struct timespec *result, struct timespec *a, struct timespec *b) +{ + result->tv_sec = a->tv_sec - b->tv_sec; + result->tv_nsec = a->tv_nsec - b->tv_nsec; + UTI_NormaliseTimespec(result); +} + +/* ================================================== */ + +/* Calculate result = a - b and return as a double */ +double +UTI_DiffTimespecsToDouble(struct timespec *a, struct timespec *b) +{ + return ((double)a->tv_sec - (double)b->tv_sec) + 1.0e-9 * (a->tv_nsec - b->tv_nsec); +} + +/* ================================================== */ + +void +UTI_AddDoubleToTimespec(struct timespec *start, double increment, struct timespec *end) +{ + time_t int_part; + + int_part = increment; + end->tv_sec = start->tv_sec + int_part; + end->tv_nsec = start->tv_nsec + 1.0e9 * (increment - int_part); + UTI_NormaliseTimespec(end); +} + +/* ================================================== */ + +/* Calculate the average and difference (as a double) of two timespecs */ +void +UTI_AverageDiffTimespecs(struct timespec *earlier, struct timespec *later, + struct timespec *average, double *diff) +{ + *diff = UTI_DiffTimespecsToDouble(later, earlier); + UTI_AddDoubleToTimespec(earlier, *diff / 2.0, average); +} + +/* ================================================== */ + +void +UTI_AddDiffToTimespec(struct timespec *a, struct timespec *b, + struct timespec *c, struct timespec *result) +{ + double diff; + + diff = UTI_DiffTimespecsToDouble(a, b); + UTI_AddDoubleToTimespec(c, diff, result); +} + +/* ================================================== */ + +#define POOL_ENTRIES 16 +#define BUFFER_LENGTH 64 +static char buffer_pool[POOL_ENTRIES][BUFFER_LENGTH]; +static int pool_ptr = 0; + +#define NEXT_BUFFER (buffer_pool[pool_ptr = ((pool_ptr + 1) % POOL_ENTRIES)]) + +/* ================================================== */ +/* Convert a timespec into a temporary string, largely for diagnostic display */ + +char * +UTI_TimespecToString(struct timespec *ts) +{ + char *result; + + result = NEXT_BUFFER; +#ifdef HAVE_LONG_TIME_T + snprintf(result, BUFFER_LENGTH, "%"PRId64".%09lu", + (int64_t)ts->tv_sec, (unsigned long)ts->tv_nsec); +#else + snprintf(result, BUFFER_LENGTH, "%ld.%09lu", + (long)ts->tv_sec, (unsigned long)ts->tv_nsec); +#endif + return result; +} + +/* ================================================== */ +/* Convert an NTP timestamp into a temporary string, largely + for diagnostic display */ + +char * +UTI_Ntp64ToString(NTP_int64 *ntp_ts) +{ + struct timespec ts; + UTI_Ntp64ToTimespec(ntp_ts, &ts); + return UTI_TimespecToString(&ts); +} + +/* ================================================== */ + +char * +UTI_RefidToString(uint32_t ref_id) +{ + unsigned int i, j, c; + char *result; + + result = NEXT_BUFFER; + + for (i = j = 0; i < 4 && i < BUFFER_LENGTH - 1; i++) { + c = (ref_id >> (24 - i * 8)) & 0xff; + if (isprint(c)) + result[j++] = c; + } + + result[j] = '\0'; + + return result; +} + +/* ================================================== */ + +char * +UTI_IPToString(IPAddr *addr) +{ + unsigned long a, b, c, d, ip; + uint8_t *ip6; + char *result; + + result = NEXT_BUFFER; + switch (addr->family) { + case IPADDR_UNSPEC: + snprintf(result, BUFFER_LENGTH, "[UNSPEC]"); + break; + case IPADDR_INET4: + ip = addr->addr.in4; + a = (ip>>24) & 0xff; + b = (ip>>16) & 0xff; + c = (ip>> 8) & 0xff; + d = (ip>> 0) & 0xff; + snprintf(result, BUFFER_LENGTH, "%lu.%lu.%lu.%lu", a, b, c, d); + break; + case IPADDR_INET6: + ip6 = addr->addr.in6; +#ifdef FEAT_IPV6 + inet_ntop(AF_INET6, ip6, result, BUFFER_LENGTH); +#else + assert(BUFFER_LENGTH >= 40); + for (a = 0; a < 8; a++) + snprintf(result + a * 5, 40 - a * 5, "%04x:", + (unsigned int)(ip6[2 * a] << 8 | ip6[2 * a + 1])); +#endif + break; + default: + snprintf(result, BUFFER_LENGTH, "[UNKNOWN]"); + } + return result; +} + +/* ================================================== */ + +int +UTI_StringToIP(const char *addr, IPAddr *ip) +{ +#ifdef FEAT_IPV6 + struct in_addr in4; + struct in6_addr in6; + + if (inet_pton(AF_INET, addr, &in4) > 0) { + ip->family = IPADDR_INET4; + ip->_pad = 0; + ip->addr.in4 = ntohl(in4.s_addr); + return 1; + } + + if (inet_pton(AF_INET6, addr, &in6) > 0) { + ip->family = IPADDR_INET6; + ip->_pad = 0; + memcpy(ip->addr.in6, in6.s6_addr, sizeof (ip->addr.in6)); + return 1; + } +#else + unsigned long a, b, c, d, n; + + n = sscanf(addr, "%lu.%lu.%lu.%lu", &a, &b, &c, &d); + if (n == 4) { + ip->family = IPADDR_INET4; + ip->_pad = 0; + ip->addr.in4 = ((a & 0xff) << 24) | ((b & 0xff) << 16) | + ((c & 0xff) << 8) | (d & 0xff); + return 1; + } +#endif + + return 0; +} + +/* ================================================== */ + +uint32_t +UTI_IPToRefid(IPAddr *ip) +{ + static int MD5_hash = -1; + unsigned char buf[16]; + + switch (ip->family) { + case IPADDR_INET4: + return ip->addr.in4; + case IPADDR_INET6: + if (MD5_hash < 0) + MD5_hash = HSH_GetHashId("MD5"); + + if (MD5_hash < 0 || + HSH_Hash(MD5_hash, (const unsigned char *)ip->addr.in6, sizeof (ip->addr.in6), + NULL, 0, buf, sizeof (buf)) != sizeof (buf)) + LOG_FATAL("Could not get MD5"); + + return (uint32_t)buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3]; + } + return 0; +} + +/* ================================================== */ + +uint32_t +UTI_IPToHash(IPAddr *ip) +{ + static uint32_t seed = 0; + unsigned char *addr; + unsigned int i, len; + uint32_t hash; + + switch (ip->family) { + case IPADDR_INET4: + addr = (unsigned char *)&ip->addr.in4; + len = sizeof (ip->addr.in4); + break; + case IPADDR_INET6: + addr = ip->addr.in6; + len = sizeof (ip->addr.in6); + break; + default: + return 0; + } + + /* Include a random seed in the hash to randomize collisions + and order of addresses in hash tables */ + while (!seed) + UTI_GetRandomBytes(&seed, sizeof (seed)); + + for (i = 0, hash = seed; i < len; i++) + hash = 71 * hash + addr[i]; + + return hash + seed; +} + +/* ================================================== */ + +void +UTI_IPHostToNetwork(IPAddr *src, IPAddr *dest) +{ + /* Don't send uninitialized bytes over network */ + memset(dest, 0, sizeof (IPAddr)); + + dest->family = htons(src->family); + + switch (src->family) { + case IPADDR_INET4: + dest->addr.in4 = htonl(src->addr.in4); + break; + case IPADDR_INET6: + memcpy(dest->addr.in6, src->addr.in6, sizeof (dest->addr.in6)); + break; + default: + dest->family = htons(IPADDR_UNSPEC); + } +} + +/* ================================================== */ + +void +UTI_IPNetworkToHost(IPAddr *src, IPAddr *dest) +{ + dest->family = ntohs(src->family); + dest->_pad = 0; + + switch (dest->family) { + case IPADDR_INET4: + dest->addr.in4 = ntohl(src->addr.in4); + break; + case IPADDR_INET6: + memcpy(dest->addr.in6, src->addr.in6, sizeof (dest->addr.in6)); + break; + default: + dest->family = IPADDR_UNSPEC; + } +} + +/* ================================================== */ + +int +UTI_CompareIPs(IPAddr *a, IPAddr *b, IPAddr *mask) +{ + int i, d; + + if (a->family != b->family) + return a->family - b->family; + + if (mask && mask->family != b->family) + mask = NULL; + + switch (a->family) { + case IPADDR_UNSPEC: + return 0; + case IPADDR_INET4: + if (mask) + return (a->addr.in4 & mask->addr.in4) - (b->addr.in4 & mask->addr.in4); + else + return a->addr.in4 - b->addr.in4; + case IPADDR_INET6: + for (i = 0, d = 0; !d && i < 16; i++) { + if (mask) + d = (a->addr.in6[i] & mask->addr.in6[i]) - + (b->addr.in6[i] & mask->addr.in6[i]); + else + d = a->addr.in6[i] - b->addr.in6[i]; + } + return d; + } + return 0; +} + +/* ================================================== */ + +void +UTI_SockaddrToIPAndPort(struct sockaddr *sa, IPAddr *ip, unsigned short *port) +{ + switch (sa->sa_family) { + case AF_INET: + ip->family = IPADDR_INET4; + ip->addr.in4 = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); + *port = ntohs(((struct sockaddr_in *)sa)->sin_port); + break; +#ifdef FEAT_IPV6 + case AF_INET6: + ip->family = IPADDR_INET6; + memcpy(ip->addr.in6, ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr, + sizeof (ip->addr.in6)); + *port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); + break; +#endif + default: + ip->family = IPADDR_UNSPEC; + *port = 0; + } +} + +/* ================================================== */ + +int +UTI_IPAndPortToSockaddr(IPAddr *ip, unsigned short port, struct sockaddr *sa) +{ + switch (ip->family) { + case IPADDR_INET4: + memset(sa, 0, sizeof (struct sockaddr_in)); + sa->sa_family = AF_INET; + ((struct sockaddr_in *)sa)->sin_addr.s_addr = htonl(ip->addr.in4); + ((struct sockaddr_in *)sa)->sin_port = htons(port); +#ifdef SIN6_LEN + ((struct sockaddr_in *)sa)->sin_len = sizeof (struct sockaddr_in); +#endif + return sizeof (struct sockaddr_in); +#ifdef FEAT_IPV6 + case IPADDR_INET6: + memset(sa, 0, sizeof (struct sockaddr_in6)); + sa->sa_family = AF_INET6; + memcpy(((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr, ip->addr.in6, + sizeof (ip->addr.in6)); + ((struct sockaddr_in6 *)sa)->sin6_port = htons(port); +#ifdef SIN6_LEN + ((struct sockaddr_in6 *)sa)->sin6_len = sizeof (struct sockaddr_in6); +#endif + return sizeof (struct sockaddr_in6); +#endif + default: + memset(sa, 0, sizeof (struct sockaddr)); + sa->sa_family = AF_UNSPEC; + return 0; + } +} + +/* ================================================== */ + +char *UTI_SockaddrToString(struct sockaddr *sa) +{ + unsigned short port; + IPAddr ip; + char *result, *sun_path; + + result = NEXT_BUFFER; + + switch (sa->sa_family) { + case AF_INET: +#ifdef AF_INET6 + case AF_INET6: +#endif + UTI_SockaddrToIPAndPort(sa, &ip, &port); + snprintf(result, BUFFER_LENGTH, "%s:%hu", UTI_IPToString(&ip), port); + break; + case AF_UNIX: + sun_path = ((struct sockaddr_un *)sa)->sun_path; + snprintf(result, BUFFER_LENGTH, "%.*s", BUFFER_LENGTH - 1, sun_path); + /* Indicate truncated path */ + if (strlen(sun_path) >= BUFFER_LENGTH) + result[BUFFER_LENGTH - 2] = '>'; + break; + default: + snprintf(result, BUFFER_LENGTH, "[UNKNOWN]"); + } + + return result; +} + +/* ================================================== */ + +const char * +UTI_SockaddrFamilyToString(int family) +{ + switch (family) { + case AF_INET: + return "IPv4"; +#ifdef AF_INET6 + case AF_INET6: + return "IPv6"; +#endif + case AF_UNIX: + return "Unix"; + case AF_UNSPEC: + return "UNSPEC"; + default: + return "?"; + } +} + +/* ================================================== */ + +char * +UTI_TimeToLogForm(time_t t) +{ + struct tm *stm; + char *result; + + result = NEXT_BUFFER; + + stm = gmtime(&t); + + if (stm) + strftime(result, BUFFER_LENGTH, "%Y-%m-%d %H:%M:%S", stm); + else + snprintf(result, BUFFER_LENGTH, "INVALID INVALID "); + + return result; +} + +/* ================================================== */ + +void +UTI_AdjustTimespec(struct timespec *old_ts, struct timespec *when, struct timespec *new_ts, double *delta_time, double dfreq, double doffset) +{ + double elapsed; + + elapsed = UTI_DiffTimespecsToDouble(when, old_ts); + *delta_time = elapsed * dfreq - doffset; + UTI_AddDoubleToTimespec(old_ts, *delta_time, new_ts); +} + +/* ================================================== */ + +void +UTI_GetNtp64Fuzz(NTP_int64 *ts, int precision) +{ + int start, bits; + + assert(precision >= -32 && precision <= 32); + assert(sizeof (*ts) == 8); + + start = sizeof (*ts) - (precision + 32 + 7) / 8; + ts->hi = ts->lo = 0; + + UTI_GetRandomBytes((unsigned char *)ts + start, sizeof (*ts) - start); + + bits = (precision + 32) % 8; + if (bits) + ((unsigned char *)ts)[start] %= 1U << bits; +} + +/* ================================================== */ + +double +UTI_Ntp32ToDouble(NTP_int32 x) +{ + return (double) ntohl(x) / 65536.0; +} + +/* ================================================== */ + +#define MAX_NTP_INT32 (4294967295.0 / 65536.0) + +NTP_int32 +UTI_DoubleToNtp32(double x) +{ + NTP_int32 r; + + if (x >= MAX_NTP_INT32) { + r = 0xffffffff; + } else if (x <= 0.0) { + r = 0; + } else { + x *= 65536.0; + r = x; + + /* Round up */ + if (r < x) + r++; + } + + return htonl(r); +} + +/* ================================================== */ + +void +UTI_ZeroNtp64(NTP_int64 *ts) +{ + ts->hi = ts->lo = htonl(0); +} + +/* ================================================== */ + +int +UTI_IsZeroNtp64(NTP_int64 *ts) +{ + return !ts->hi && !ts->lo; +} + +/* ================================================== */ + +int +UTI_CompareNtp64(NTP_int64 *a, NTP_int64 *b) +{ + int32_t diff; + + if (a->hi == b->hi && a->lo == b->lo) + return 0; + + diff = ntohl(a->hi) - ntohl(b->hi); + + if (diff < 0) + return -1; + if (diff > 0) + return 1; + + return ntohl(a->lo) < ntohl(b->lo) ? -1 : 1; +} + +/* ================================================== */ + +int +UTI_IsEqualAnyNtp64(NTP_int64 *a, NTP_int64 *b1, NTP_int64 *b2, NTP_int64 *b3) +{ + if (b1 && a->lo == b1->lo && a->hi == b1->hi) + return 1; + + if (b2 && a->lo == b2->lo && a->hi == b2->hi) + return 1; + + if (b3 && a->lo == b3->lo && a->hi == b3->hi) + return 1; + + return 0; +} + +/* ================================================== */ + +/* Seconds part of NTP timestamp correponding to the origin of the time_t format */ +#define JAN_1970 0x83aa7e80UL + +#define NSEC_PER_NTP64 4.294967296 + +void +UTI_TimespecToNtp64(struct timespec *src, NTP_int64 *dest, NTP_int64 *fuzz) +{ + uint32_t hi, lo, sec, nsec; + + sec = (uint32_t)src->tv_sec; + nsec = (uint32_t)src->tv_nsec; + + /* Recognize zero as a special case - it always signifies + an 'unknown' value */ + if (!nsec && !sec) { + hi = lo = 0; + } else { + hi = htonl(sec + JAN_1970); + lo = htonl(NSEC_PER_NTP64 * nsec); + + /* Add the fuzz */ + if (fuzz) { + hi ^= fuzz->hi; + lo ^= fuzz->lo; + } + } + + dest->hi = hi; + dest->lo = lo; +} + +/* ================================================== */ + +void +UTI_Ntp64ToTimespec(NTP_int64 *src, struct timespec *dest) +{ + uint32_t ntp_sec, ntp_frac; + + /* Zero is a special value */ + if (UTI_IsZeroNtp64(src)) { + UTI_ZeroTimespec(dest); + return; + } + + ntp_sec = ntohl(src->hi); + ntp_frac = ntohl(src->lo); + +#ifdef HAVE_LONG_TIME_T + dest->tv_sec = ntp_sec - (uint32_t)(NTP_ERA_SPLIT + JAN_1970) + + (time_t)NTP_ERA_SPLIT; +#else + dest->tv_sec = ntp_sec - JAN_1970; +#endif + + dest->tv_nsec = ntp_frac / NSEC_PER_NTP64; +} + +/* ================================================== */ + +/* Maximum offset between two sane times */ +#define MAX_OFFSET 4294967296.0 + +/* Minimum allowed distance from maximum 32-bit time_t */ +#define MIN_ENDOFTIME_DISTANCE (365 * 24 * 3600) + +int +UTI_IsTimeOffsetSane(struct timespec *ts, double offset) +{ + double t; + + /* Handle nan correctly here */ + if (!(offset > -MAX_OFFSET && offset < MAX_OFFSET)) + return 0; + + t = UTI_TimespecToDouble(ts) + offset; + + /* Time before 1970 is not considered valid */ + if (t < 0.0) + return 0; + +#ifdef HAVE_LONG_TIME_T + /* Check if it's in the interval to which NTP time is mapped */ + if (t < (double)NTP_ERA_SPLIT || t > (double)(NTP_ERA_SPLIT + (1LL << 32))) + return 0; +#else + /* Don't get too close to 32-bit time_t overflow */ + if (t > (double)(0x7fffffff - MIN_ENDOFTIME_DISTANCE)) + return 0; +#endif + + return 1; +} + +/* ================================================== */ + +double +UTI_Log2ToDouble(int l) +{ + if (l >= 0) { + if (l > 31) + l = 31; + return (uint32_t)1 << l; + } else { + if (l < -31) + l = -31; + return 1.0 / ((uint32_t)1 << -l); + } +} + +/* ================================================== */ + +void +UTI_TimespecNetworkToHost(Timespec *src, struct timespec *dest) +{ + uint32_t sec_low, nsec; +#ifdef HAVE_LONG_TIME_T + uint32_t sec_high; +#endif + + sec_low = ntohl(src->tv_sec_low); +#ifdef HAVE_LONG_TIME_T + sec_high = ntohl(src->tv_sec_high); + if (sec_high == TV_NOHIGHSEC) + sec_high = 0; + + dest->tv_sec = (uint64_t)sec_high << 32 | sec_low; +#else + dest->tv_sec = sec_low; +#endif + + nsec = ntohl(src->tv_nsec); + dest->tv_nsec = MIN(nsec, 999999999U); +} + +/* ================================================== */ + +void +UTI_TimespecHostToNetwork(struct timespec *src, Timespec *dest) +{ + dest->tv_nsec = htonl(src->tv_nsec); +#ifdef HAVE_LONG_TIME_T + dest->tv_sec_high = htonl((uint64_t)src->tv_sec >> 32); +#else + dest->tv_sec_high = htonl(TV_NOHIGHSEC); +#endif + dest->tv_sec_low = htonl(src->tv_sec); +} + +/* ================================================== */ + +#define FLOAT_EXP_BITS 7 +#define FLOAT_EXP_MIN (-(1 << (FLOAT_EXP_BITS - 1))) +#define FLOAT_EXP_MAX (-FLOAT_EXP_MIN - 1) +#define FLOAT_COEF_BITS ((int)sizeof (int32_t) * 8 - FLOAT_EXP_BITS) +#define FLOAT_COEF_MIN (-(1 << (FLOAT_COEF_BITS - 1))) +#define FLOAT_COEF_MAX (-FLOAT_COEF_MIN - 1) + +double +UTI_FloatNetworkToHost(Float f) +{ + int32_t exp, coef; + uint32_t x; + + x = ntohl(f.f); + + exp = x >> FLOAT_COEF_BITS; + if (exp >= 1 << (FLOAT_EXP_BITS - 1)) + exp -= 1 << FLOAT_EXP_BITS; + exp -= FLOAT_COEF_BITS; + + coef = x % (1U << FLOAT_COEF_BITS); + if (coef >= 1 << (FLOAT_COEF_BITS - 1)) + coef -= 1 << FLOAT_COEF_BITS; + + return coef * pow(2.0, exp); +} + +Float +UTI_FloatHostToNetwork(double x) +{ + int32_t exp, coef, neg; + Float f; + + if (x < 0.0) { + x = -x; + neg = 1; + } else if (x >= 0.0) { + neg = 0; + } else { + /* Save NaN as zero */ + x = 0.0; + neg = 0; + } + + if (x < 1.0e-100) { + exp = coef = 0; + } else if (x > 1.0e100) { + exp = FLOAT_EXP_MAX; + coef = FLOAT_COEF_MAX + neg; + } else { + exp = log(x) / log(2) + 1; + coef = x * pow(2.0, -exp + FLOAT_COEF_BITS) + 0.5; + + assert(coef > 0); + + /* we may need to shift up to two bits down */ + while (coef > FLOAT_COEF_MAX + neg) { + coef >>= 1; + exp++; + } + + if (exp > FLOAT_EXP_MAX) { + /* overflow */ + exp = FLOAT_EXP_MAX; + coef = FLOAT_COEF_MAX + neg; + } else if (exp < FLOAT_EXP_MIN) { + /* underflow */ + if (exp + FLOAT_COEF_BITS >= FLOAT_EXP_MIN) { + coef >>= FLOAT_EXP_MIN - exp; + exp = FLOAT_EXP_MIN; + } else { + exp = coef = 0; + } + } + } + + /* negate back */ + if (neg) + coef = (uint32_t)-coef << FLOAT_EXP_BITS >> FLOAT_EXP_BITS; + + f.f = htonl((uint32_t)exp << FLOAT_COEF_BITS | coef); + return f; +} + +/* ================================================== */ + +int +UTI_FdSetCloexec(int fd) +{ + int flags; + + flags = fcntl(fd, F_GETFD); + if (flags != -1) { + flags |= FD_CLOEXEC; + return !fcntl(fd, F_SETFD, flags); + } + + return 0; +} + +/* ================================================== */ + +void +UTI_SetQuitSignalsHandler(void (*handler)(int), int ignore_sigpipe) +{ + struct sigaction sa; + + sa.sa_handler = handler; + sa.sa_flags = SA_RESTART; + if (sigemptyset(&sa.sa_mask) < 0) + LOG_FATAL("sigemptyset() failed"); + +#ifdef SIGINT + if (sigaction(SIGINT, &sa, NULL) < 0) + LOG_FATAL("sigaction(%d) failed", SIGINT); +#endif +#ifdef SIGTERM + if (sigaction(SIGTERM, &sa, NULL) < 0) + LOG_FATAL("sigaction(%d) failed", SIGTERM); +#endif +#ifdef SIGQUIT + if (sigaction(SIGQUIT, &sa, NULL) < 0) + LOG_FATAL("sigaction(%d) failed", SIGQUIT); +#endif +#ifdef SIGHUP + if (sigaction(SIGHUP, &sa, NULL) < 0) + LOG_FATAL("sigaction(%d) failed", SIGHUP); +#endif + + if (ignore_sigpipe) + sa.sa_handler = SIG_IGN; + + if (sigaction(SIGPIPE, &sa, NULL) < 0) + LOG_FATAL("sigaction(%d) failed", SIGPIPE); +} + +/* ================================================== */ + +char * +UTI_PathToDir(const char *path) +{ + char *dir, *slash; + + slash = strrchr(path, '/'); + + if (!slash) + return Strdup("."); + + if (slash == path) + return Strdup("/"); + + dir = Malloc(slash - path + 1); + snprintf(dir, slash - path + 1, "%s", path); + + return dir; +} + +/* ================================================== */ + +static int +create_dir(char *p, mode_t mode, uid_t uid, gid_t gid) +{ + int status; + struct stat buf; + + /* See if directory exists */ + status = stat(p, &buf); + + if (status < 0) { + if (errno != ENOENT) { + LOG(LOGS_ERR, "Could not access %s : %s", p, strerror(errno)); + return 0; + } + } else { + if (S_ISDIR(buf.st_mode)) + return 1; + LOG(LOGS_ERR, "%s is not directory", p); + return 0; + } + + /* Create the directory */ + if (mkdir(p, mode) < 0) { + LOG(LOGS_ERR, "Could not create directory %s : %s", p, strerror(errno)); + return 0; + } + + /* Set its owner */ + if (chown(p, uid, gid) < 0) { + LOG(LOGS_ERR, "Could not change ownership of %s : %s", p, strerror(errno)); + /* Don't leave it there with incorrect ownership */ + rmdir(p); + return 0; + } + + return 1; +} + +/* ================================================== */ +/* Return 0 if the directory couldn't be created, 1 if it could (or + already existed) */ +int +UTI_CreateDirAndParents(const char *path, mode_t mode, uid_t uid, gid_t gid) +{ + char *p; + int i, j, k, last; + + /* Don't try to create current directory */ + if (!strcmp(path, ".")) + return 1; + + p = (char *)Malloc(1 + strlen(path)); + + i = k = 0; + while (1) { + p[i++] = path[k++]; + + if (path[k] == '/' || !path[k]) { + /* Check whether its end of string, a trailing / or group of / */ + last = 1; + j = k; + while (path[j]) { + if (path[j] != '/') { + /* Pick up a / into p[] thru the assignment at the top of the loop */ + k = j - 1; + last = 0; + break; + } + j++; + } + + p[i] = 0; + + if (!create_dir(p, last ? mode : 0755, last ? uid : 0, last ? gid : 0)) { + Free(p); + return 0; + } + + if (last) + break; + } + + if (!path[k]) + break; + } + + Free(p); + return 1; +} + +/* ================================================== */ + +int +UTI_CheckDirPermissions(const char *path, mode_t perm, uid_t uid, gid_t gid) +{ + struct stat buf; + + if (stat(path, &buf)) { + LOG(LOGS_ERR, "Could not access %s : %s", path, strerror(errno)); + return 0; + } + + if (!S_ISDIR(buf.st_mode)) { + LOG(LOGS_ERR, "%s is not directory", path); + return 0; + } + + if ((buf.st_mode & 0777) & ~perm) { + LOG(LOGS_ERR, "Wrong permissions on %s", path); + return 0; + } + + if (buf.st_uid != uid) { + LOG(LOGS_ERR, "Wrong owner of %s (%s != %u)", path, "UID", uid); + return 0; + } + + if (buf.st_gid != gid) { + LOG(LOGS_ERR, "Wrong owner of %s (%s != %u)", path, "GID", gid); + return 0; + } + + return 1; +} + +/* ================================================== */ + +void +UTI_DropRoot(uid_t uid, gid_t gid) +{ + /* Drop supplementary groups */ + if (setgroups(0, NULL)) + LOG_FATAL("setgroups() failed : %s", strerror(errno)); + + /* Set effective, saved and real group ID */ + if (setgid(gid)) + LOG_FATAL("setgid(%u) failed : %s", gid, strerror(errno)); + + /* Set effective, saved and real user ID */ + if (setuid(uid)) + LOG_FATAL("setuid(%u) failed : %s", uid, strerror(errno)); + + DEBUG_LOG("Dropped root privileges: UID %u GID %u", uid, gid); +} + +/* ================================================== */ + +#define DEV_URANDOM "/dev/urandom" + +void +UTI_GetRandomBytesUrandom(void *buf, unsigned int len) +{ + static FILE *f = NULL; + + if (!f) + f = fopen(DEV_URANDOM, "r"); + if (!f) + LOG_FATAL("Can't open %s : %s", DEV_URANDOM, strerror(errno)); + if (fread(buf, 1, len, f) != len) + LOG_FATAL("Can't read from %s", DEV_URANDOM); +} + +/* ================================================== */ + +#ifdef HAVE_GETRANDOM +static void +get_random_bytes_getrandom(char *buf, unsigned int len) +{ + static char rand_buf[256]; + static unsigned int available = 0, disabled = 0; + unsigned int i; + + for (i = 0; i < len; i++) { + if (!available) { + if (disabled) + break; + + if (getrandom(rand_buf, sizeof (rand_buf), GRND_NONBLOCK) != sizeof (rand_buf)) { + disabled = 1; + break; + } + + available = sizeof (rand_buf); + } + + buf[i] = rand_buf[--available]; + } + + if (i < len) + UTI_GetRandomBytesUrandom(buf, len); +} +#endif + +/* ================================================== */ + +void +UTI_GetRandomBytes(void *buf, unsigned int len) +{ +#ifdef HAVE_ARC4RANDOM + arc4random_buf(buf, len); +#elif defined(HAVE_GETRANDOM) + get_random_bytes_getrandom(buf, len); +#else + UTI_GetRandomBytesUrandom(buf, len); +#endif +} |