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      1  1.1  pooka /*
      2  1.1  pooka  * dhcpcd - DHCP client daemon
      3  1.1  pooka  * Copyright (c) 2006-2009 Roy Marples <roy (at) marples.name>
      4  1.1  pooka  * All rights reserved
      5  1.1  pooka 
      6  1.1  pooka  * Redistribution and use in source and binary forms, with or without
      7  1.1  pooka  * modification, are permitted provided that the following conditions
      8  1.1  pooka  * are met:
      9  1.1  pooka  * 1. Redistributions of source code must retain the above copyright
     10  1.1  pooka  *    notice, this list of conditions and the following disclaimer.
     11  1.1  pooka  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.1  pooka  *    notice, this list of conditions and the following disclaimer in the
     13  1.1  pooka  *    documentation and/or other materials provided with the distribution.
     14  1.1  pooka  *
     15  1.1  pooka  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  1.1  pooka  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  1.1  pooka  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  1.1  pooka  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  1.1  pooka  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  1.1  pooka  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  1.1  pooka  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  1.1  pooka  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  1.1  pooka  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  1.1  pooka  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  1.1  pooka  * SUCH DAMAGE.
     26  1.1  pooka  */
     27  1.1  pooka 
     28  1.1  pooka /* Needed define to get at getline for glibc and FreeBSD */
     29  1.1  pooka #ifndef _GNU_SOURCE
     30  1.1  pooka #  define _GNU_SOURCE
     31  1.1  pooka #endif
     32  1.1  pooka 
     33  1.1  pooka #include <sys/cdefs.h>
     34  1.1  pooka 
     35  1.1  pooka #ifdef __APPLE__
     36  1.1  pooka #  include <mach/mach_time.h>
     37  1.1  pooka #  include <mach/kern_return.h>
     38  1.1  pooka #endif
     39  1.1  pooka 
     40  1.1  pooka #include <sys/param.h>
     41  1.1  pooka #include <sys/time.h>
     42  1.1  pooka 
     43  1.1  pooka #include <errno.h>
     44  1.1  pooka #include <fcntl.h>
     45  1.1  pooka #include <limits.h>
     46  1.1  pooka #ifdef BSD
     47  1.1  pooka #  include <paths.h>
     48  1.1  pooka #endif
     49  1.1  pooka #include <stdint.h>
     50  1.1  pooka #include <stdio.h>
     51  1.1  pooka #include <stdlib.h>
     52  1.1  pooka #include <string.h>
     53  1.1  pooka #include <time.h>
     54  1.1  pooka #include <unistd.h>
     55  1.1  pooka 
     56  1.1  pooka #include "common.h"
     57  1.1  pooka 
     58  1.1  pooka #ifndef _PATH_DEVNULL
     59  1.1  pooka #  define _PATH_DEVNULL "/dev/null"
     60  1.1  pooka #endif
     61  1.1  pooka 
     62  1.1  pooka int clock_monotonic;
     63  1.1  pooka #ifdef DEBUG_MEMORY
     64  1.1  pooka static char lbuf_set;
     65  1.1  pooka #endif
     66  1.1  pooka 
     67  1.1  pooka #ifdef DEBUG_MEMORY
     68  1.1  pooka static void
     69  1.1  pooka free_lbuf(void)
     70  1.1  pooka {
     71  1.1  pooka 	free(lbuf);
     72  1.1  pooka 	lbuf = NULL;
     73  1.1  pooka }
     74  1.1  pooka #endif
     75  1.1  pooka 
     76  1.1  pooka /* Handy function to get the time.
     77  1.1  pooka  * We only care about time advancements, not the actual time itself
     78  1.1  pooka  * Which is why we use CLOCK_MONOTONIC, but it is not available on all
     79  1.1  pooka  * platforms.
     80  1.1  pooka  */
     81  1.1  pooka #define NO_MONOTONIC "host does not support a monotonic clock - timing can skew"
     82  1.1  pooka int
     83  1.1  pooka get_monotonic(struct timeval *tp)
     84  1.1  pooka {
     85  1.1  pooka 	static int posix_clock_set = 0;
     86  1.1  pooka #if defined(_POSIX_MONOTONIC_CLOCK) && defined(CLOCK_MONOTONIC)
     87  1.1  pooka 	struct timespec ts;
     88  1.1  pooka 	static clockid_t posix_clock;
     89  1.1  pooka 
     90  1.1  pooka 	if (!posix_clock_set) {
     91  1.1  pooka 		if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
     92  1.1  pooka 			posix_clock = CLOCK_MONOTONIC;
     93  1.1  pooka 			clock_monotonic = posix_clock_set = 1;
     94  1.1  pooka 		}
     95  1.1  pooka 	}
     96  1.1  pooka 
     97  1.1  pooka 	if (clock_monotonic) {
     98  1.1  pooka 		if (clock_gettime(posix_clock, &ts) == 0) {
     99  1.1  pooka 			tp->tv_sec = ts.tv_sec;
    100  1.1  pooka 			tp->tv_usec = ts.tv_nsec / 1000;
    101  1.1  pooka 			return 0;
    102  1.1  pooka 		}
    103  1.1  pooka 	}
    104  1.1  pooka #elif defined(__APPLE__)
    105  1.1  pooka #define NSEC_PER_SEC 1000000000
    106  1.1  pooka 	/* We can use mach kernel functions here.
    107  1.1  pooka 	 * This is crap though - why can't they implement clock_gettime?*/
    108  1.1  pooka 	static struct mach_timebase_info info = { 0, 0 };
    109  1.1  pooka 	static double factor = 0.0;
    110  1.1  pooka 	uint64_t nano;
    111  1.1  pooka 	long rem;
    112  1.1  pooka 
    113  1.1  pooka 	if (!posix_clock_set) {
    114  1.1  pooka 		if (mach_timebase_info(&info) == KERN_SUCCESS) {
    115  1.1  pooka 			factor = (double)info.numer / (double)info.denom;
    116  1.1  pooka 			clock_monotonic = posix_clock_set = 1;
    117  1.1  pooka 		}
    118  1.1  pooka 	}
    119  1.1  pooka 	if (clock_monotonic) {
    120  1.1  pooka 		nano = mach_absolute_time();
    121  1.1  pooka 		if ((info.denom != 1 || info.numer != 1) && factor != 0.0)
    122  1.1  pooka 			nano *= factor;
    123  1.1  pooka 		tp->tv_sec = nano / NSEC_PER_SEC;
    124  1.1  pooka 		rem = nano % NSEC_PER_SEC;
    125  1.1  pooka 		if (rem < 0) {
    126  1.1  pooka 			tp->tv_sec--;
    127  1.1  pooka 			rem += NSEC_PER_SEC;
    128  1.1  pooka 		}
    129  1.1  pooka 		tp->tv_usec = rem / 1000;
    130  1.1  pooka 		return 0;
    131  1.1  pooka 	}
    132  1.1  pooka #endif
    133  1.1  pooka 
    134  1.1  pooka 	/* Something above failed, so fall back to gettimeofday */
    135  1.1  pooka 	if (!posix_clock_set) {
    136  1.1  pooka 		posix_clock_set = 1;
    137  1.1  pooka 	}
    138  1.1  pooka 	return gettimeofday(tp, NULL);
    139  1.1  pooka }
    140  1.1  pooka 
    141  1.1  pooka time_t
    142  1.1  pooka uptime(void)
    143  1.1  pooka {
    144  1.1  pooka 	struct timeval tv;
    145  1.1  pooka 
    146  1.1  pooka 	if (get_monotonic(&tv) == -1)
    147  1.1  pooka 		return -1;
    148  1.1  pooka 	return tv.tv_sec;
    149  1.1  pooka }
    150  1.1  pooka 
    151  1.1  pooka void *
    152  1.1  pooka xmalloc(size_t s)
    153  1.1  pooka {
    154  1.1  pooka 	void *value = malloc(s);
    155  1.1  pooka 
    156  1.1  pooka 	if (value != NULL)
    157  1.1  pooka 		return value;
    158  1.1  pooka 	abort();
    159  1.1  pooka 	/* NOTREACHED */
    160  1.1  pooka }
    161  1.1  pooka 
    162  1.1  pooka void *
    163  1.1  pooka xzalloc(size_t s)
    164  1.1  pooka {
    165  1.1  pooka 	void *value = xmalloc(s);
    166  1.1  pooka 
    167  1.1  pooka 	memset(value, 0, s);
    168  1.1  pooka 	return value;
    169  1.1  pooka }
    170  1.1  pooka 
    171  1.1  pooka void *
    172  1.1  pooka xrealloc(void *ptr, size_t s)
    173  1.1  pooka {
    174  1.1  pooka 	void *value = realloc(ptr, s);
    175  1.1  pooka 
    176  1.1  pooka 	if (value != NULL)
    177  1.1  pooka 		return value;
    178  1.1  pooka 	abort();
    179  1.1  pooka 	/* NOTREACHED */
    180  1.1  pooka }
    181  1.1  pooka 
    182  1.1  pooka char *
    183  1.1  pooka xstrdup(const char *str)
    184  1.1  pooka {
    185  1.1  pooka 	char *value;
    186  1.1  pooka 
    187  1.1  pooka 	if (str == NULL)
    188  1.1  pooka 		return NULL;
    189  1.1  pooka 
    190  1.1  pooka 	if ((value = strdup(str)) != NULL)
    191  1.1  pooka 		return value;
    192  1.1  pooka 
    193  1.1  pooka 	abort();
    194  1.1  pooka 	/* NOTREACHED */
    195  1.1  pooka }
    196