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usb_moded-mac.c
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usb_moded-mac.c
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/**
@file usb_moded-mac.c
Copyright (C) 2013 Jolla. All rights reserved.
@author: Philippe De Swert <philippe.deswert@jollamobile.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the Lesser GNU General Public License
version 2 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 Lesser GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include <stdio.h>
#include "usb_moded-mac.h"
#include "usb_moded-log.h"
static void random_ether_addr(unsigned char *addr)
{
FILE *random;
size_t count = 0;
random = fopen("/dev/urandom", "r");
count = fread(addr, 1, 6, random);
fclose(random);
if(count > 0 )
{
addr [0] &= 0xfe; /* clear multicast bit */
addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
}
else
log_warning("MAC generation failed!\n");
}
void generate_random_mac (void)
{
unsigned char addr[6];
int i;
FILE *g_ether;
log_debug("Getting random usb ethernet mac\n");
random_ether_addr(addr);
g_ether = fopen("/etc/modprobe.d/g_ether.conf", "w");
if(!g_ether)
{
log_warning("Failed to write mac address to /etc/modprobe.d/g_ether.conf\n");
return;
}
fprintf(g_ether, "options g_ether host_addr=");
for(i=0; i<5; i++)
{
fprintf(g_ether, "%02x:",addr[i]);
}
fprintf(g_ether, "%02x\n",addr[i]);
fclose(g_ether);
}
char * read_mac(void)
{
FILE *g_ether;
char *mac = NULL, *ret = NULL;
size_t read = 0;
int test = 0;
g_ether = fopen("/etc/modprobe.d/g_ether.conf", "r");
if(!g_ether)
{
log_warning("Failed to read mac address from /etc/modprobe.d/g_ether.conf\n");
return(NULL);
}
test = fseek(g_ether, 26, SEEK_SET);
if(test == -1)
{
fclose(g_ether);
return 0;
}
mac = malloc(sizeof(char) *17);
if(mac)
read = fread(mac, 1, 17, g_ether);
if(read == 17)
ret = strndup(mac,17);
else
ret = 0;
free(mac);
fclose(g_ether);
return(ret);
}