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#ifndef SOCKET_HPP
#define SOCKET_HPP
# include "sanity.hpp"
# include <netinet/in.h>
# include <cstdio>
# include "timer.t.hpp"
// Struct declaration
struct socket_data
{
/// Checks whether a newly-connected socket actually does anything
time_t created;
bool connected;
/// Flag needed since structure must be freed in a server-dependent manner
bool eof;
/// Since this is a single-threaded application, it can't block
/// These are the read/write queues
uint8_t *rdata, *wdata;
size_t max_rdata, max_wdata;
/// How much is actually in the queue
size_t rdata_size, wdata_size;
/// How much has already been read from the queue
/// Note that there is no need for a wdata_pos
size_t rdata_pos;
struct sockaddr_in client_addr;
/// Send or recieve
/// Only called when select() indicates the socket is ready
/// If, after that, nothing is read, it sets eof
// These could probably be hard-coded with a little work
void(*func_recv)(int);
void(*func_send)(int);
/// This is the important one
/// Set to different functions depending on whether the connection
/// is a player or a server/ladmin
/// Can be set explicitly or via set_defaultparse
void(*func_parse)(int);
/// Server-specific data type
void *session_data;
};
// save file descriptors for important stuff
constexpr int SOFT_LIMIT = FD_SETSIZE - 50;
// socket timeout to establish a full connection in seconds
constexpr int CONNECT_TIMEOUT = 15;
/// Everyone who has connected
// note: call delete_session(i) to null out an element
extern struct socket_data *session[FD_SETSIZE];
/// Maximum used FD, +1
extern int fd_max;
/// open a socket, bind, and listen. Return an fd, or -1 if socket() fails,
/// but exit if bind() or listen() fails
int make_listen_port(uint16_t port);
/// Connect to an address, return a connected socket or -1
// FIXME - this is IPv4 only!
int make_connection(uint32_t ip, uint16_t port);
/// free() the structure and close() the fd
void delete_session(int);
/// Make a the internal queues bigger
void realloc_fifo(int fd, size_t rfifo_size, size_t wfifo_size);
/// Update all sockets that can be read/written from the queues
void do_sendrecv(interval_t next);
/// Call the parser function for every socket that has read data
void do_parsepacket(void);
/// An init function
void do_socket(void);
/// Change the default parser for newly connected clients
// typically called once per server, but individual clients may identify
// themselves as servers
void set_defaultparse(void(*defaultparse)(int));
/// Wrappers to track number of free FDs
void fclose_(FILE * fp);
FILE *fopen_(const char *path, const char *mode);
bool free_fds(void);
/// Check how much can be read
inline
size_t RFIFOREST(int fd)
{
return session[fd]->rdata_size - session[fd]->rdata_pos;
}
/// Read from the queue
inline
const void *RFIFOP(int fd, size_t pos)
{
return session[fd]->rdata + session[fd]->rdata_pos + pos;
}
inline
uint8_t RFIFOB(int fd, size_t pos)
{
return *static_cast<const uint8_t *>(RFIFOP(fd, pos));
}
inline
uint16_t RFIFOW(int fd, size_t pos)
{
return *static_cast<const uint16_t *>(RFIFOP(fd, pos));
}
inline
uint32_t RFIFOL(int fd, size_t pos)
{
return *static_cast<const uint32_t *>(RFIFOP(fd, pos));
}
/// Done reading
void RFIFOSKIP(int fd, size_t len);
/// Read from an arbitrary buffer
inline
const void *RBUFP(const uint8_t *p, size_t pos)
{
return p + pos;
}
inline
uint8_t RBUFB(const uint8_t *p, size_t pos)
{
return *static_cast<const uint8_t *>(RBUFP(p, pos));
}
inline
uint16_t RBUFW(const uint8_t *p, size_t pos)
{
return *static_cast<const uint16_t *>(RBUFP(p, pos));
}
inline
uint32_t RBUFL(const uint8_t *p, size_t pos)
{
return *static_cast<const uint32_t *>(RBUFP(p, pos));
}
/// Unused - check how much data can be written
inline
size_t WFIFOSPACE(int fd)
{
return session[fd]->max_wdata - session[fd]->wdata_size;
}
/// Write to the queue
inline
void *WFIFOP(int fd, size_t pos)
{
return session[fd]->wdata + session[fd]->wdata_size + pos;
}
inline
uint8_t& WFIFOB(int fd, size_t pos)
{
return *static_cast<uint8_t *>(WFIFOP(fd, pos));
}
inline
uint16_t& WFIFOW(int fd, size_t pos)
{
return *static_cast<uint16_t *>(WFIFOP(fd, pos));
}
inline
uint32_t& WFIFOL(int fd, size_t pos)
{
return *static_cast<uint32_t *>(WFIFOP(fd, pos));
}
/// Finish writing
void WFIFOSET(int fd, size_t len);
/// Write to an arbitrary buffer
inline
void *WBUFP(uint8_t *p, size_t pos)
{
return p + pos;
}
inline
uint8_t& WBUFB(uint8_t *p, size_t pos)
{
return *static_cast<uint8_t *>(WBUFP(p, pos));
}
inline
uint16_t& WBUFW(uint8_t *p, size_t pos)
{
return *static_cast<uint16_t *>(WBUFP(p, pos));
}
inline
uint32_t& WBUFL(uint8_t *p, size_t pos)
{
return *static_cast<uint32_t *>(WBUFP(p, pos));
}
#endif // SOCKET_HPP
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