11/8/2022 0 Comments Convert mac address to bytes![]() ![]()
Here's a program I just whipped up to create a magic packet from a MAC string. I mean, by removing the ':' in between, I get total of 6 bytes and those 6 bytes should sit as six bytes in a byte array. That said, it's still pretty trivial to convert a MAC string to an array of bytes using vanilla C . Convert mac address to bytes how to#how to convert the Certificate String into X509 structure. 00:45:36:45:f2:00 I want to convert this mac address into byte array. Convert mac address to bytes windows#How to get hardware MAC address on Windows.Convert string with explicit escape sequence into relative character.Convert string from _DATE_ into a time_t convert to a byte array create a second byte array copy first byte array into new byte array or create byte array loop to populate array simple choice :) Get an unlimited membership to EE for less than 4 a week.How can modern compiler optimization convert recursion into returning a constant?.The second result is easier to read in my head. The first option is to show it can be done just by using char references, if the mac address will always look the same. Convert mac address to bytes code#For example, suppose the IEEE assigns an OUI 0000AA to the xyz company. The following code will get the same result and in my opinion its easier to read. MAC addresses of all NICs or onboard NIC devices manufactured by the same manufacturer always start with the same 3-bytes OUI numbers. Another faster version without calling library functions: inline unsigned read_hex_byte(char const** beg, char const* end) into a std::function? 6 bytes MAC address 3 bytes OUI number obtained from the IEEE 3 bytes unique number assigned by the manufacturer. Printf("%s\n", MACADDR_toString_r(mac, str, sizeof(str))) Or you can come up with more complex schemes. ![]() You can just take the MAC in hex and take 1 hex digit of MAX random byte second hex digit of MAC random digit etc. Snprintf(str, size, "x:x:x:x:x:x", from the MAC address without letting the user know how it was generated. If(addr = NULL || str = NULL || size < 18) return NULL Snprintf(str, sizeof(str), "x:x:x:x:x:x",Īddr, addr, addr, addr, addr, addr) Ĭhar* MACADDR_toString_r(unsigned char* addr, char* str, size_t size) Unsigned char mac = Ĭhar* MACADDR_toString(unsigned char* addr) Here's both a non-reentrant solution similar to inet_ntoa(), and a re-entrant solution similar to inet_ntoa_r(): #include (also, it allows the compiler to check the type you're using against the function parameter to ensure it is correct.) Make sure there is plenty of space between the groups so that you can write another eight numbers under them. ![]() Each of these groups of two numbers is going to take up one byte. Next, I recommend you create a function to write the MAC addresses, so you aren't copying and pasting the same printf() statement everywhere in your code and adjusting the array you're indexing. Divide the address into six equal parts of two numbers, to maintain organization. I think unsigned char is better in this case. I have a simple MAC address as a string, 'b8:27:eb:97:b6:39', and I would like to get it into a byte array, 184, 39, 235, 151, 182, 57 in C code. First, you probably want to adjust the type you use to store the MAC address. ![]()
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