summaryrefslogtreecommitdiff
path: root/src/common/socket.hpp
blob: ac7fbaea53529d49ad330cea50f0896fe53070e5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
#ifndef SOCKET_HPP
#define SOCKET_HPP

# include "sanity.hpp"

# include <netinet/in.h>
# include <sys/socket.h>
# include <sys/types.h>

# include <cstdio>
# include <ctime>

/// Check how much can be read
# define RFIFOREST(fd) (session[fd]->rdata_size-session[fd]->rdata_pos)
/// Read from the queue
# define RFIFOP(fd,pos) (session[fd]->rdata+session[fd]->rdata_pos+(pos))
# define RFIFOB(fd,pos) (*(uint8_t*)(RFIFOP(fd, pos)))
# define RFIFOW(fd,pos) (*(uint16_t*)(RFIFOP(fd, pos)))
# define RFIFOL(fd,pos) (*(uint32_t*)(RFIFOP(fd, pos)))
/// Done reading
void RFIFOSKIP(int fd, size_t len);
/// Internal - clean up by discarding handled bytes
# define RFIFOFLUSH(fd) (memmove(session[fd]->rdata,RFIFOP(fd,0),RFIFOREST(fd)),\
session[fd]->rdata_size=RFIFOREST(fd),\
session[fd]->rdata_pos=0)

/// Used internally - how much room there is to read more data
# define RFIFOSPACE(fd) (session[fd]->max_rdata-session[fd]->rdata_size)

/// Read from an arbitrary buffer
# define RBUFP(p,pos) (((uint8_t*)(p))+(pos))
# define RBUFB(p,pos) (*(uint8_t*)RBUFP((p),(pos)))
# define RBUFW(p,pos) (*(uint16_t*)RBUFP((p),(pos)))
# define RBUFL(p,pos) (*(uint32_t*)RBUFP((p),(pos)))



/// Unused - check how much data can be written
# define WFIFOSPACE(fd) (session[fd]->max_wdata-session[fd]->wdata_size)
/// Write to the queue
# define WFIFOP(fd,pos) (session[fd]->wdata+session[fd]->wdata_size+(pos))
# define WFIFOB(fd,pos) (*(uint8_t*)(WFIFOP(fd,pos)))
# define WFIFOW(fd,pos) (*(uint16_t*)(WFIFOP(fd,pos)))
# define WFIFOL(fd,pos) (*(uint32_t*)(WFIFOP(fd,pos)))
/// Finish writing
void WFIFOSET(int fd, size_t len);

/// Write to an arbitrary buffer
#define WBUFP(p,pos) (((uint8_t*)(p))+(pos))
#define WBUFB(p,pos) (*(uint8_t*)WBUFP((p),(pos)))
#define WBUFW(p,pos) (*(uint16_t*)WBUFP((p),(pos)))
#define WBUFL(p,pos) (*(uint32_t*)WBUFP((p),(pos)))

// 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
# define SOFT_LIMIT (FD_SETSIZE - 50)

// socket timeout to establish a full connection in seconds
# define 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(uint32_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);

#endif // SOCKET_HPP