source: src/router/services/sysinit/tools/recover.c @ 17208

void start_backup(void)
{
        char drive[64];
#ifdef HAVE_RB600
        sprintf(drive, "/dev/sda");
#else
        strcpy(drive, getdisc());
#endif
        //backup nvram
        fprintf(stderr, "backup nvram\n");
        FILE *in = fopen("/usr/local/nvram/nvram.bin", "rb");
        if (in) {
                char *mem = malloc(65536);
                fread(mem, 65536, 1, in);
                fclose(in);
                in = fopen(drive, "r+b");
                fseeko(in, 0, SEEK_END);
                off_t mtdlen = ftello(in);
                fseeko(in, mtdlen-(65536*2), SEEK_SET);
                fwrite(mem, 65536, 1, in);
                fclose(in);
                eval("sync");
                fprintf(stderr, "reread for sync disc\n");
                in = fopen(drive, "rb");
                fseeko(in, mtdlen-(65536*2), SEEK_SET);
                fread(mem, 65536, 1, in);
                fprintf(stderr, "%X%X%X%X\n", mem[0] & 0xff, mem[1] & 0xff,
                        mem[2] & 0xff, mem[3] & 0xff);
                fclose(in);
                free(mem);
        }

}

void start_recover(void)
{
        FILE *in;
        char dev[64];
        fprintf(stderr, "recover broken nvram\n");
#ifdef HAVE_RB600
        sprintf(dev, "/dev/sda");
#else
        strcpy(dev, getdisc());
#endif
        in = fopen(dev, "rb");
        fseeko(in, 0, SEEK_END);
        off_t mtdlen = ftello64(in);
        fseeko(in, mtdlen-(65536*2), SEEK_SET);

        unsigned char *mem = malloc(65536);
        fread(mem, 65536, 1, in);
        fclose(in);
        if (mem[0] == 0x46 && mem[1] == 0x4c && mem[2] == 0x53
            && mem[3] == 0x48) {
                fprintf(stderr, "found recovery\n");
                in = fopen("/usr/local/nvram/nvram.bin", "wb");
                if (in != NULL) {
                        fwrite(mem, 65536, 1, in);
                        fclose(in);
                }
        }
        free(mem);

}