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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/DeprecatedString.h>
#include <AK/StringUtils.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
static bool try_set_offset_and_length_parameters(DeprecatedString const& arg_offset, DeprecatedString const& arg_length, u64& offset, u64& length)
{
// TODO: Add support for hex values
auto possible_offset = arg_offset.to_uint<u64>();
if (!possible_offset.has_value())
return false;
auto possible_length = arg_length.to_uint<u64>();
if (!possible_length.has_value())
return false;
offset = possible_offset.value();
length = possible_length.value();
return true;
}
static void try_to_dump_with_memory_mapping(int fd, u64 offset, u64 length)
{
VERIFY(fd >= 0);
u64 mmoffset = offset % sysconf(_SC_PAGESIZE);
void* mmp = mmap(NULL, mmoffset + length, PROT_READ, MAP_SHARED, fd, offset - mmoffset);
if (mmp == MAP_FAILED) {
perror("mmap");
return;
}
size_t ncomplete = 0;
while (ncomplete < length) {
ssize_t nwritten = write(STDOUT_FILENO, static_cast<u8*>(mmp) + ncomplete, length - ncomplete);
if (nwritten < 0) {
perror("write");
return;
}
ncomplete += nwritten;
}
if (munmap(mmp, mmoffset + length) < 0) {
perror("munmap");
}
}
static void try_to_dump_with_read(int fd, u64 offset, u64 length)
{
VERIFY(fd >= 0);
auto rs = lseek(fd, offset, SEEK_SET);
if (rs < 0) {
fprintf(stderr, "Couldn't seek to offset %" PRIi64 " while verifying: %s\n", offset, strerror(errno));
return;
}
u8 buf[4096];
size_t ncomplete = 0;
while (ncomplete < length) {
size_t length_to_be_read = min<size_t>((length - ncomplete), sizeof(buf));
if (read(fd, buf, length_to_be_read) < 0) {
perror("read");
return;
}
ssize_t nwritten = write(STDOUT_FILENO, buf, length_to_be_read);
if (nwritten < 0) {
perror("write");
return;
}
ncomplete += nwritten;
}
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath"));
StringView arg_offset;
StringView arg_length;
bool use_read_instead_of_mmap = false;
Core::ArgsParser args;
args.add_positional_argument(arg_offset, "Physical Address (Offset)", "offset", Core::ArgsParser::Required::Yes);
args.add_positional_argument(arg_length, "Length of that region", "length", Core::ArgsParser::Required::Yes);
args.add_option(use_read_instead_of_mmap, "Read /dev/mem instead of try to map it", nullptr, 'r');
args.parse(arguments);
u64 offset = 0;
u64 length = 0;
if (!try_set_offset_and_length_parameters(arg_offset, arg_length, offset, length)) {
warnln("pmemdump: Invalid length or offset parameters\n");
return 1;
}
int fd = open("/dev/mem", O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
if (use_read_instead_of_mmap)
try_to_dump_with_read(fd, offset, length);
else
try_to_dump_with_memory_mapping(fd, offset, length);
close(fd);
return 0;
}
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