getmac.c

/* To FreeXperia from a friend :) */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#define MISC_FILE "/dev/block/platform/msm_sdcc.1/by-name/misc"
#define NV_IN "/system/etc/firmware/wlan/prima/WCNSS_qcom_wlan_nv.bin"
#define NV_OUT "/data/misc/wifi/WCNSS_qcom_wlan_nv.bin"

#define NV_SIZE 28456

int main(int argc, char **argv)
{
	char *buf;
	struct stat statbuf;
	int ret;
	size_t actual;
	FILE *f;
	char macaddr[18];

	memset(macaddr, 0, 18);

	f = fopen(MISC_FILE, "r");
	fseek(f, 0x3000, SEEK_SET);
	unsigned char macbuf[6];
	fread(macbuf, 6, 1, f);
	sprintf(macaddr,"%02x%02x%02x%02x%02x%02x",
		macbuf[0], macbuf[1], macbuf[2],
		macbuf[3], macbuf[4], macbuf[5]);

	fclose(f);

	ret = stat(NV_IN, &statbuf);
	if (ret) {
		perror("Failed to stat " NV_IN);
		exit(EINVAL);
	}
	f = fopen(NV_IN, "r");
	if (!f) {
		perror("Failed to open " NV_IN);
		exit(EINVAL);
	}

	if (statbuf.st_size < 100) {
		perror("nv file too small");
		exit(EINVAL);
	}

	if (statbuf.st_size != NV_SIZE)
		perror("Warning - size invalid");

	buf = malloc(statbuf.st_size);
	if (!buf) {
		perror("malloc failed");
		exit(ENOMEM);
	}

	actual = fread(buf, 1, statbuf.st_size, f);
	if (actual != statbuf.st_size) {
		perror("Failed to read from nv");
		exit(EINVAL);
	}
	fclose(f);

	f = fopen(NV_OUT, "w+");
	if (!f) {
		perror("Failed to open " NV_OUT);
		exit(EINVAL);
	}
	actual = fwrite(buf, 1, statbuf.st_size, f);
	if (actual != statbuf.st_size) {
		perror("Failed to write to nv");
		exit(EINVAL);
	}

	fseek(f, 0xa, SEEK_SET);
	fwrite(macaddr, 1, 6, f);

	fclose(f);

	return 0;
}