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// SPDX-License-Identifier: BSD-3-Clause
#include <stdexcept>
#include <unistd.h>
#include <ios>
#include <arpa/inet.h>
#include <cerrno>
#include "connection.h"
#include "../p18/commands.h"
#include "../p18/response.h"
#include "../logging.h"
#include "../common.h"
#include "hexdump/hexdump.h"
#include "signal.h"
#define CHECK_ARGUMENTS_LENGTH(__size__) \
if (arguments.size() != (__size__)) { \
std::ostringstream error; \
error << "invalid arguments count: expected " << (__size__) << ", got " << arguments.size(); \
throw std::invalid_argument(error.str()); \
}
#define CHECK_ARGUMENTS_MIN_LENGTH(__size__) \
if (arguments.size() < (__size__)) { \
std::ostringstream error; \
error << "invalid arguments count: expected " << (__size__) << ", got " << arguments.size(); \
throw std::invalid_argument(error.str()); \
}
namespace server {
Connection::Connection(int sock, struct sockaddr_in addr, Server* server)
: sock_(sock), addr_(addr), server_(server)
{
if (server_->verbose())
mylog << "new connection from " << ipv4();
thread_ = std::thread(&Connection::run, this);
thread_.detach();
}
Connection::~Connection() {
if (server_->verbose())
mylog << "closing socket..";
if (close(sock_) == -1)
myerr << ipv4() << ": close: " << strerror(errno);
server_->removeConnection(this);
}
void Connection::run() {
static int bufSize = 2048;
char buf[bufSize];
while (true) {
long rcvd = readLoop(buf, bufSize - 1);
if (rcvd == -1) {
if (errno != EINTR && server_->verbose())
myerr << ipv4() << ": recv: " << std::string(strerror(errno));
break;
}
if (rcvd == 0)
break;
buf[rcvd] = '\0';
if (*buf == '\4')
break;
Response resp = processRequest(buf);
if (!sendResponse(resp))
break;
}
delete this;
}
int Connection::readLoop(char* buf, size_t bufSize) const {
char* bufptr = buf;
int left = static_cast<int>(bufSize);
int readed = 0;
while (left > 0) {
size_t rcvd = recv(sock_, bufptr, left, 0);
if (rcvd == -1)
return -1;
if (rcvd == 0)
break;
readed += static_cast<int>(rcvd);
if (*bufptr == '\4')
break;
left -= static_cast<int>(rcvd);
bufptr += rcvd;
bufptr[rcvd] = '\0';
char* ptr = strstr(buf, "\r\n");
if (ptr)
break;
}
return readed;
}
bool Connection::writeLoop(const char* buf, size_t bufSize) const {
const char* bufptr = buf;
int left = static_cast<int>(bufSize);
while (left > 0) {
size_t bytesSent = send(sock_, bufptr, left, 0);
if (bytesSent == -1) {
if (errno != EINTR && server_->verbose())
myerr << ipv4() << ": send: " << std::string(strerror(errno));
return false;
}
left -= static_cast<int>(bytesSent);
bufptr += bytesSent;
}
return true;
}
bool Connection::sendResponse(Response& resp) const {
std::ostringstream sbuf;
sbuf << resp;
std::string s = sbuf.str();
const char* buf = s.c_str();
size_t bufSize = s.size();
return writeLoop(buf, bufSize);
}
std::string Connection::ipv4() const {
char ip[INET_ADDRSTRLEN] = {0};
const char* result = inet_ntop(AF_INET, (const void*)&addr_.sin_addr, ip, sizeof(ip));
if (result == nullptr)
return "?";
std::ostringstream buf;
buf << ip << ":" << htons(addr_.sin_port);
return buf.str();
}
Response Connection::processRequest(char* buf) {
std::stringstream sbuf;
int n = 0;
std::vector<std::string> arguments;
RequestType type;
Response resp;
resp.type = ResponseType::OK;
try {
char* last = nullptr;
const char* delim = " ";
for (char* token = strtok_r(buf, delim, &last);
token != nullptr;
token = strtok_r(nullptr, delim, &last)) {
char* ptr = strstr(token, "\r\n");
if (ptr)
*ptr = '\0';
if (!n++) {
std::string s = std::string(token);
if (s == "format")
type = RequestType::Format;
else if (s == "v")
type = RequestType::Version;
else if (s == "exec")
type = RequestType::Execute;
else if (s == "raw")
type = RequestType::Raw;
else
throw std::invalid_argument("invalid token: " + s);
} else if (strlen(token) > 0)
arguments.emplace_back(token);
}
switch (type) {
case RequestType::Version: {
CHECK_ARGUMENTS_LENGTH(1)
auto v = static_cast<unsigned>(std::stoul(arguments[0]));
if (v != 1)
throw std::invalid_argument("invalid protocol version");
options_.version = v;
break;
}
case RequestType::Format:
CHECK_ARGUMENTS_LENGTH(1)
options_.format = format_from_string(arguments[0]);
break;
case RequestType::Execute: {
CHECK_ARGUMENTS_MIN_LENGTH(1)
std::string& command = arguments[0];
auto commandArguments = std::vector<std::string>();
auto argumentsSlice = std::vector<std::string>(arguments.begin()+1, arguments.end());
p18::CommandInput input{&argumentsSlice};
p18::CommandType commandType = p18::validate_input(command, commandArguments, (void*)&input);
auto response = server_->executeCommand(commandType, commandArguments);
resp.buf << *(response->format(options_.format).get());
break;
}
case RequestType::Raw: {
throw std::runtime_error("not implemented");
// CHECK_ARGUMENTS_LENGTH(1)
// std::string& raw = arguments[0];
//
// resp.type = ResponseType::Error;
// resp.buf << "not implemented";
break;
}
}
}
// we except std::invalid_argument and std::runtime_error
catch (std::exception& e) {
resp.type = ResponseType::Error;
auto err = p18::response_type::ErrorResponse(e.what());
resp.buf << *(err.format(options_.format));
}
return resp;
}
std::ostream& operator<<(std::ostream& os, Response& resp) {
os << (resp.type == ResponseType::OK ? "ok" : "err");
resp.buf.seekp(0, std::ios::end);
size_t size = resp.buf.tellp();
if (size) {
resp.buf.seekp(0);
os << "\r\n" << resp.buf.str();
}
return os << "\r\n\r\n";
}
}
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