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fido_packets.cpp
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fido_packets.cpp
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/**************************************************************************/
/* */
/* WWIV Version 5.x */
/* Copyright (C)2016-2021, WWIV Software Services */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, */
/* software distributed under the License is distributed on an */
/* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, */
/* either express or implied. See the License for the specific */
/* language governing permissions and limitations under the License. */
/**************************************************************************/
#include "sdk/fido/fido_packets.h"
#include "core/file.h"
#include "core/log.h"
#include "core/os.h"
#include "core/strings.h"
#include "core/version.h"
#include "sdk/fido/fido_util.h"
#include "sdk/net/packets.h"
#include <algorithm>
#include <optional>
#include <string>
using namespace wwiv::core;
using namespace wwiv::strings;
using namespace wwiv::sdk::net;
namespace wwiv::sdk::fido {
static char ReadCharFromFile(File& f) {
char buf[1];
if (const auto num_read = f.Read(buf, 1); num_read == 0) {
return 0;
}
return buf[0];
}
static std::string ReadRestOfFile(File& f, int max_size) {
auto current = f.current_position();
const auto size = f.length();
std::string s;
const auto to_read = std::min<decltype(current)>(max_size, size - current);
s.resize(to_read + 1);
const auto num_read = f.Read(&s[0], to_read);
s.resize(num_read);
return s;
}
/**
* Reads a field of length {len}. Will trim the field to remove
* any trailing nulls.
*/
static std::string ReadFixedLengthField(File& f, int len) {
std::string s;
s.resize(len + 1);
const auto num_read = f.Read(&s[0], len);
s.resize(num_read);
while (!s.empty() && s.back() == '\0') {
// Remove trailing null characters.
s.pop_back();
}
return s;
}
/**
* Reads a null-terminated field of up to length {len} or the first null
* character.
*/
static std::string ReadVariableLengthField(File& f, int max_len) {
std::string s;
for (auto i = 0; i < max_len; i++) {
const auto ch = ReadCharFromFile(f);
if (ch == 0) {
return s;
}
s.push_back(ch);
}
return s;
}
FidoStoredMessage::~FidoStoredMessage() = default;
bool write_fido_packet_header(File& f, const packet_header_2p_t& header) {
if (const auto num_written = f.Write(&header, sizeof(packet_header_2p_t));
num_written != sizeof(packet_header_2p_t)) {
LOG(ERROR) << "short write to packet, wrote " << num_written
<< "; expected: " << sizeof(packet_header_2p_t);
return false;
}
return true;
}
bool write_packed_message(File& f, const FidoPackedMessage& packet) {
if (const auto num_written = f.Write(&packet.nh, sizeof(fido_packed_message_t));
num_written != sizeof(fido_packed_message_t)) {
LOG(ERROR) << "short write to packet, wrote " << num_written
<< "; expected: " << sizeof(fido_packed_message_t);
return false;
}
f.Write(packet.vh.date_time.c_str(), 19);
f.Write("\0", 1);
f.Write(packet.vh.to_user_name);
f.Write("\0", 1);
f.Write(packet.vh.from_user_name);
f.Write("\0", 1);
f.Write(packet.vh.subject);
f.Write("\0", 1);
f.Write(packet.vh.text);
f.Write("\0", 1);
// End of packet.
f.Write("\0\0", 2);
return true;
}
bool write_stored_message(File& f, FidoStoredMessage& packet) {
if (const auto num = f.Write(&packet.nh, sizeof(fido_stored_message_t));
num != sizeof(fido_stored_message_t)) {
LOG(ERROR) << "Short write on write_stored_message. Wrote: " << num
<< "; expected: " << sizeof(fido_stored_message_t);
return false;
}
return f.Write(packet.text) == ssize(packet.text);
}
/**
* Reads a packed message.
* See http://ftsc.org/docs/fts-0001.016
*/
ReadPacketResponse read_packed_message(File& f, FidoPackedMessage& packet) {
const auto num_read = f.Read(&packet.nh, sizeof(fido_packed_message_t));
if (num_read == 0) {
// at the end of the packet.
return ReadPacketResponse::END_OF_FILE;
}
if (num_read == 2) {
// FIDO packets have 2 bytes of NULL at the end;
if (packet.nh.message_type == 0) {
return ReadPacketResponse::END_OF_FILE;
}
}
if (num_read != sizeof(fido_packed_message_t)) {
LOG(INFO) << "error reading header, got short read of size: " << num_read
<< "; expected: " << sizeof(fido_packed_message_t);
return ReadPacketResponse::ERROR;
}
if (packet.nh.message_type != 2) {
LOG(INFO) << "invalid message_type: " << packet.nh.message_type << "; expected: 2";
}
packet.vh.date_time = ReadFixedLengthField(f, 20);
packet.vh.to_user_name = ReadVariableLengthField(f, 36);
packet.vh.from_user_name = ReadVariableLengthField(f, 36);
packet.vh.subject = ReadVariableLengthField(f, 72);
packet.vh.text = ReadVariableLengthField(f, 256 * 1024);
return ReadPacketResponse::OK;
}
ReadPacketResponse read_stored_message(File& f, FidoStoredMessage& packet) {
if (const auto num_read = f.Read(&packet.nh, sizeof(fido_stored_message_t)); num_read == 0) {
// at the end of the packet.
return ReadPacketResponse::END_OF_FILE;
}
packet.text = ReadRestOfFile(f, 32 * 1024);
return ReadPacketResponse::OK;
}
// FidoPacket
packet_header_2p_t CreateType2PlusPacketHeader(const FidoAddress& from_address,
const FidoAddress& dest, const DateTime& now,
const std::string& packet_password) {
packet_header_2p_t header = {};
header.orig_zone = from_address.zone();
header.orig_net = from_address.net();
header.orig_node = from_address.node();
header.orig_point = from_address.point();
header.dest_zone = dest.zone();
header.dest_net = dest.net();
header.dest_node = dest.node();
header.dest_point = dest.point();
const auto tm = now.to_tm();
header.year = static_cast<uint16_t>(tm.tm_year);
header.month = static_cast<uint16_t>(tm.tm_mon);
header.day = static_cast<uint16_t>(tm.tm_mday);
header.hour = static_cast<uint16_t>(tm.tm_hour);
header.minute = static_cast<uint16_t>(tm.tm_min);
header.second = static_cast<uint16_t>(tm.tm_sec);
header.baud = 33600;
header.packet_ver = 2;
header.product_code_high = 0x1d;
header.product_code_low = 0xff;
header.qm_dest_zone = dest.zone();
header.qm_orig_zone = from_address.zone();
header.capabilities = 0x0001;
// Ideally we'd just use bswap_16 if it was available everywhere.
header.capabilities_valid =
(header.capabilities & 0xff) << 8 | (header.capabilities & 0xff00) >> 8;
header.product_rev_major = 0;
header.product_rev_minor = static_cast<uint8_t>(wwiv_network_compatible_version() & 0xff);
// Add in packet password. We don't want to ensure we have
// a trailing null since we may want all 8 bytes to be usable
// by the password.
to_char_array_no_null(header.password, packet_password);
return header;
}
// static
std::optional<FidoPacket> FidoPacket::Open(const std::filesystem::path& path) {
File f(path);
if (!f.Open(File::modeBinary | File::modeReadOnly)) {
VLOG(2) << "Unable to open file: " << path.string();
return std::nullopt;
}
FidoPacket packet(std::move(f), true);
auto num_header_read = packet.file_.Read(&packet.header_, sizeof(packet_header_2p_t));
if (num_header_read < static_cast<int>(sizeof(packet_header_2p_t))) {
LOG(ERROR) << "Read less than packet header";
return std::nullopt;
}
return packet;
}
// static
std::optional<FidoPacket> FidoPacket::Create(const std::filesystem::path& outbound_path,
const packet_header_2p_t& header,
wwiv::core::Clock& clock) {
for (auto tries = 0; tries < 10; tries++) {
auto now = clock.Now().now();
File file(FilePath(outbound_path, packet_name(now)));
if (!file.Open(File::modeCreateFile | File::modeExclusive | File::modeReadWrite |
File::modeBinary,
File::shareDenyReadWrite)) {
LOG(INFO) << "Will try again: Unable to create packet file: " << file;
clock.SleepFor(std::chrono::seconds(1));
continue;
}
// Create packet with file and original header
FidoPacket packet(std::move(file), true, header);
// Then update packet header time to match when we actually created the packet on disk.
const auto tm = now.to_tm();
packet.header_.year = static_cast<uint16_t>(tm.tm_year);
packet.header_.month = static_cast<uint16_t>(tm.tm_mon);
packet.header_.day = static_cast<uint16_t>(tm.tm_mday);
packet.header_.hour = static_cast<uint16_t>(tm.tm_hour);
packet.header_.minute = static_cast<uint16_t>(tm.tm_min);
packet.header_.second = static_cast<uint16_t>(tm.tm_sec);
if (!packet.write_fido_packet_header()) {
return std::nullopt;
}
return std::move(packet);
}
return std::nullopt;
}
bool FidoPacket::write_fido_packet_header() {
if (const auto num_written = file_.Write(&header_, sizeof(packet_header_2p_t));
num_written != sizeof(packet_header_2p_t)) {
LOG(ERROR) << "short write to packet, wrote " << num_written
<< "; expected: " << sizeof(packet_header_2p_t);
return false;
}
return true;
}
bool FidoPacket::Write(const FidoPackedMessage& packet) {
return write_packed_message(file_, packet);
}
std::tuple<wwiv::sdk::net::ReadPacketResponse, FidoPackedMessage> FidoPacket::Read() {
FidoPackedMessage msg;
auto response = read_packed_message(file_, msg);
return std::make_tuple(response, msg);
}
} // namespace wwiv