mirror of
https://github.com/rsmarples/dhcpcd.git
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1a7ff10050
Ensure that if.c and if-KERNEL.c are namespaced correctly.
246 lines
5.6 KiB
C
246 lines
5.6 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2006-2014 Roy Marples <roy@marples.name>
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Needed define to get at getline for glibc and FreeBSD */
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include <sys/cdefs.h>
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#ifdef __APPLE__
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# include <mach/mach_time.h>
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# include <mach/kern_return.h>
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#ifdef BSD
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# include <paths.h>
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#endif
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include "common.h"
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#ifndef _PATH_DEVNULL
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# define _PATH_DEVNULL "/dev/null"
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#endif
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const char *
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get_hostname(char *buf, size_t buflen, int short_hostname)
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{
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char *p;
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if (gethostname(buf, buflen) != 0)
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return NULL;
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buf[buflen - 1] = '\0';
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if (strcmp(buf, "(none)") == 0 ||
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strcmp(buf, "localhost") == 0 ||
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strncmp(buf, "localhost.", strlen("localhost.")) == 0 ||
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buf[0] == '.')
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return NULL;
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if (short_hostname) {
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p = strchr(buf, '.');
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if (p)
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*p = '\0';
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}
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return buf;
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}
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/* Handy function to get the time.
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* We only care about time advancements, not the actual time itself
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* Which is why we use CLOCK_MONOTONIC, but it is not available on all
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* platforms.
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*/
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#define NO_MONOTONIC "host does not support a monotonic clock - timing can skew"
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int
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get_monotonic(struct timeval *tp)
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{
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#if defined(_POSIX_MONOTONIC_CLOCK) && defined(CLOCK_MONOTONIC)
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
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tp->tv_sec = ts.tv_sec;
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tp->tv_usec = (suseconds_t)(ts.tv_nsec / 1000);
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return 0;
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}
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#elif defined(__APPLE__)
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#define NSEC_PER_SEC 1000000000
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/* We can use mach kernel functions here.
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* This is crap though - why can't they implement clock_gettime?*/
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static struct mach_timebase_info info = { 0, 0 };
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static double factor = 0.0;
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uint64_t nano;
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long rem;
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if (!posix_clock_set) {
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if (mach_timebase_info(&info) == KERN_SUCCESS) {
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factor = (double)info.numer / (double)info.denom;
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clock_monotonic = posix_clock_set = 1;
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}
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}
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if (clock_monotonic) {
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nano = mach_absolute_time();
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if ((info.denom != 1 || info.numer != 1) && factor != 0.0)
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nano *= factor;
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tp->tv_sec = nano / NSEC_PER_SEC;
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rem = nano % NSEC_PER_SEC;
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if (rem < 0) {
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tp->tv_sec--;
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rem += NSEC_PER_SEC;
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}
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tp->tv_usec = rem / 1000;
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return 0;
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}
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#endif
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#if 0
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/* Something above failed, so fall back to gettimeofday */
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if (!posix_clock_set) {
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syslog(LOG_WARNING, NO_MONOTONIC);
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posix_clock_set = 1;
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}
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#endif
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return gettimeofday(tp, NULL);
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}
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ssize_t
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setvar(char ***e, const char *prefix, const char *var, const char *value)
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{
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size_t len = strlen(var) + strlen(value) + 3;
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if (prefix)
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len += strlen(prefix) + 1;
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**e = malloc(len);
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if (**e == NULL) {
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syslog(LOG_ERR, "%s: %m", __func__);
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return -1;
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}
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if (prefix)
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snprintf(**e, len, "%s_%s=%s", prefix, var, value);
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else
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snprintf(**e, len, "%s=%s", var, value);
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(*e)++;
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return (ssize_t)len;
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}
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ssize_t
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setvard(char ***e, const char *prefix, const char *var, size_t value)
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{
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char buffer[32];
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snprintf(buffer, sizeof(buffer), "%zu", value);
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return setvar(e, prefix, var, buffer);
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}
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time_t
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uptime(void)
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{
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struct timeval tv;
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if (get_monotonic(&tv) == -1)
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return -1;
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return tv.tv_sec;
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}
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char *
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hwaddr_ntoa(const unsigned char *hwaddr, size_t hwlen, char *buf, size_t buflen)
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{
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char *p;
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size_t i;
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if (buf == NULL) {
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return NULL;
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}
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if (hwlen * 3 > buflen) {
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errno = ENOBUFS;
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return 0;
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}
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p = buf;
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for (i = 0; i < hwlen; i++) {
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if (i > 0)
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*p ++= ':';
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p += snprintf(p, 3, "%.2x", hwaddr[i]);
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}
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*p ++= '\0';
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return buf;
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}
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size_t
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hwaddr_aton(unsigned char *buffer, const char *addr)
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{
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char c[3];
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const char *p = addr;
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unsigned char *bp = buffer;
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size_t len = 0;
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c[2] = '\0';
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while (*p) {
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c[0] = *p++;
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c[1] = *p++;
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/* Ensure that digits are hex */
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if (isxdigit((unsigned char)c[0]) == 0 ||
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isxdigit((unsigned char)c[1]) == 0)
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{
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errno = EINVAL;
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return 0;
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}
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/* We should have at least two entries 00:01 */
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if (len == 0 && *p == '\0') {
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errno = EINVAL;
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return 0;
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}
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/* Ensure that next data is EOL or a seperator with data */
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if (!(*p == '\0' || (*p == ':' && *(p + 1) != '\0'))) {
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errno = EINVAL;
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return 0;
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}
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if (*p)
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p++;
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if (bp)
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*bp++ = (unsigned char)strtol(c, NULL, 16);
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len++;
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}
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return len;
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}
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