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49184fb938
With the update to GCC 10, the compiler stopped with an error when compiling places where a MAC address is copied from outside into a packed object using the Net::Netaddress::copy method (e.g. in Net::Arp_packet::dst_mac(Mac_address)): ! error: writing 6 bytes into a region of size 4 [-Werror=stringop-overflow=] While trying to find a clean solution for this error, I found posts on gcc.gnu.org and github that stated that the size calculations that cause these errors are incorrect. Indeed, I could verify that the actual size of the two regions was static and exactly the same in places were the error occured. Furthermore, I couldn't find a way of making it more clear to the compiler that the sizes are the same. By accident, we found that using the address of the first element of the array that forms the second region instead of the array address itself, somehow circumvents the error. Fixes #4109
134 lines
2.9 KiB
C++
134 lines
2.9 KiB
C++
/*
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* \brief Generic network address definitions
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* \author Stefan Kalkowski
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* \date 2010-08-20
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*/
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/*
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* Copyright (C) 2010-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _NET__NETADDRESS_H_
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#define _NET__NETADDRESS_H_
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/* Genode */
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#include <base/stdint.h>
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#include <util/string.h>
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#include <base/output.h>
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namespace Net {
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template <unsigned, char, bool> class Network_address;
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template <unsigned LEN, char DELIM, bool HEX>
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static inline Genode::size_t ascii_to(char const *,
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Network_address<LEN, DELIM, HEX> &);
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}
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/**
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* Generic form of a network address.
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*/
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template <unsigned LEN, char DELIM, bool HEX>
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struct Net::Network_address
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{
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Genode::uint8_t addr[LEN];
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/******************
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** Constructors **
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******************/
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Network_address(Genode::uint8_t value = 0) {
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Genode::memset(&addr, value, LEN); }
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Network_address(void *src) {
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Genode::memcpy(&addr, src, LEN); }
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/*********************
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** Helper methods **
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*********************/
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void copy(void *dst) { Genode::memcpy(dst, &addr[0], LEN); }
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void print(Genode::Output &output) const
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{
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using namespace Genode;
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for (unsigned i = 0; i < LEN; i++) {
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if (!HEX) { Genode::print(output, (unsigned) addr[i]); }
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else { Genode::print(output, Hex(addr[i], Hex::OMIT_PREFIX, Hex::PAD)); }
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if (i < LEN - 1) output.out_char(DELIM);
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}
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}
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/***************
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** Operators **
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***************/
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bool operator==(const Network_address &other) const {
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/*
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* We compare from lowest address segment to highest
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* one, because in a local context, the higher segments
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* of two addresses normally don't distinguish.
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* (e.g. in an IPv4 local subnet)
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*/
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for (int i = LEN-1; i >= 0; --i) {
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if (addr[i] != other.addr[i])
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return false;
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}
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return true;
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}
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bool operator!=(const Network_address &other) const {
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return !(*this == other); }
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}
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__attribute__((packed));
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template <unsigned LEN, char DELIM, bool HEX>
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Genode::size_t Net::ascii_to(char const *str, Net::Network_address<LEN, DELIM, HEX> &result)
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{
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using namespace Genode;
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Net::Network_address<LEN, DELIM, HEX> result_buf;
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size_t number_id = 0;
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size_t read_len = 0;
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while (1) {
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/* read the current number */
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size_t number_len =
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ascii_to_unsigned(str, result_buf.addr[number_id],
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HEX ? 16 : 10);
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/* fail if there's no number */
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if (!number_len) {
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return 0; }
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/* update read length and number index */
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read_len += number_len;
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number_id++;
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/* if we have all numbers, fill result and return read length */
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if (number_id == LEN) {
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result = result_buf;
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return read_len;
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}
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/* there are numbers left, check for the delimiter */
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str += number_len;
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if (*str != DELIM) {
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return 0; }
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/* seek to next number */
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read_len++;
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str++;
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}
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}
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#endif /* _NET__NETADDRESS_H_ */
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