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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2021 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "dhcpcd.h"
#include "if-options.h"
const char *
hwaddr_ntoa(const void *hwaddr, size_t hwlen, char *buf, size_t buflen)
{
const unsigned char *hp, *ep;
char *p;
if (buf == NULL || hwlen == 0)
return NULL;
if (hwlen * 3 > buflen) {
errno = ENOBUFS;
return NULL;
}
hp = hwaddr;
ep = hp + hwlen;
p = buf;
while (hp < ep) {
if (hp != hwaddr)
*p ++= ':';
p += snprintf(p, 3, "%.2x", *hp++);
}
*p ++= '\0';
return buf;
}
size_t
hwaddr_aton(uint8_t *buffer, const char *addr)
{
char c[3];
const char *p = addr;
uint8_t *bp = buffer;
size_t len = 0;
c[2] = '\0';
while (*p != '\0') {
/* Skip separators */
c[0] = *p++;
switch (c[0]) {
case '\n': /* long duid split on lines */
case ':': /* typical mac address */
case '-': /* uuid */
continue;
}
c[1] = *p++;
/* Ensure that digits are hex */
if (isxdigit((unsigned char)c[0]) == 0 ||
isxdigit((unsigned char)c[1]) == 0)
{
errno = EINVAL;
return 0;
}
/* We should have at least two entries 00:01 */
if (len == 0 && *p == '\0') {
errno = EINVAL;
return 0;
}
if (bp)
*bp++ = (uint8_t)strtol(c, NULL, 16);
len++;
}
return len;
}
ssize_t
readfile(const char *file, void *data, size_t len)
{
int fd;
ssize_t bytes;
fd = open(file, O_RDONLY);
if (fd == -1)
return -1;
bytes = read(fd, data, len);
close(fd);
if ((size_t)bytes == len) {
errno = ENOBUFS;
return -1;
}
return bytes;
}
ssize_t
writefile(const char *file, mode_t mode, const void *data, size_t len)
{
int fd;
ssize_t bytes;
fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode);
if (fd == -1)
return -1;
bytes = write(fd, data, len);
close(fd);
return bytes;
}
int
filemtime(const char *file, time_t *time)
{
struct stat st;
if (stat(file, &st) == -1)
return -1;
*time = st.st_mtime;
return 0;
}
/* Handy routine to read very long lines in text files.
* This means we read the whole line and avoid any nasty buffer overflows.
* We strip leading space and avoid comment lines, making the code that calls
* us smaller. */
char *
get_line(char ** __restrict buf, ssize_t * __restrict buflen)
{
char *p, *c;
bool quoted;
do {
p = *buf;
if (*buf == NULL)
return NULL;
c = memchr(*buf, '\n', (size_t)*buflen);
if (c == NULL) {
c = memchr(*buf, '\0', (size_t)*buflen);
if (c == NULL)
return NULL;
*buflen = c - *buf;
*buf = NULL;
} else {
*c++ = '\0';
*buflen -= c - *buf;
*buf = c;
}
for (; *p == ' ' || *p == '\t'; p++)
;
} while (*p == '\0' || *p == '\n' || *p == '#' || *p == ';');
/* Strip embedded comments unless in a quoted string or escaped */
quoted = false;
for (c = p; *c != '\0'; c++) {
if (*c == '\\') {
c++; /* escaped */
continue;
}
if (*c == '"')
quoted = !quoted;
else if (*c == '#' && !quoted) {
*c = '\0';
break;
}
}
return p;
}
int
is_root_local(void)
{
#ifdef ST_LOCAL
struct statvfs vfs;
if (statvfs("/", &vfs) == -1)
return -1;
return vfs.f_flag & ST_LOCAL ? 1 : 0;
#else
errno = ENOTSUP;
return -1;
#endif
}
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