forked from OctaForge/OctaCore
731 lines
19 KiB
C++
731 lines
19 KiB
C++
#ifdef WIN32
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#define FD_SETSIZE 4096
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#else
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#include <sys/types.h>
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#undef __FD_SETSIZE
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#define __FD_SETSIZE 4096
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#endif
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#include "cube.hh"
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#include <signal.h>
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#include <enet/time.h>
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#define INPUT_LIMIT 4096
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#define OUTPUT_LIMIT (64*1024)
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#define CLIENT_TIME (3*60*1000)
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#define AUTH_TIME (30*1000)
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#define AUTH_LIMIT 100
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#define AUTH_THROTTLE 1000
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#define CLIENT_LIMIT 4096
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#define DUP_LIMIT 16
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#define PING_TIME 3000
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#define PING_RETRY 5
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#define KEEPALIVE_TIME (65*60*1000)
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#define SERVER_LIMIT 4096
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#define SERVER_DUP_LIMIT 10
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FILE *logfile = NULL;
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struct userinfo
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{
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char *name;
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void *pubkey;
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};
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hashnameset<userinfo> users;
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void adduser(char *name, char *pubkey)
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{
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name = newstring(name);
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userinfo &u = users[name];
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u.name = name;
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u.pubkey = parsepubkey(pubkey);
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}
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COMMAND(adduser, "ss");
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void clearusers()
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{
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enumerate(users, userinfo, u, { delete[] u.name; freepubkey(u.pubkey); });
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users.clear();
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}
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COMMAND(clearusers, "");
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vector<ipmask> bans, servbans, gbans;
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void clearbans()
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{
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bans.shrink(0);
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servbans.shrink(0);
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gbans.shrink(0);
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}
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COMMAND(clearbans, "");
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void addban(vector<ipmask> &bans, const char *name)
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{
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ipmask ban;
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ban.parse(name);
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bans.add(ban);
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}
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ICOMMAND(ban, "s", (char *name), addban(bans, name));
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ICOMMAND(servban, "s", (char *name), addban(servbans, name));
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ICOMMAND(gban, "s", (char *name), addban(gbans, name));
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bool checkban(vector<ipmask> &bans, enet_uint32 host)
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{
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loopv(bans) if(bans[i].check(host)) return true;
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return false;
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}
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struct authreq
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{
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enet_uint32 reqtime;
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uint id;
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void *answer;
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};
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struct gameserver
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{
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ENetAddress address;
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string ip;
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int port, numpings;
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enet_uint32 lastping, lastpong;
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};
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vector<gameserver *> gameservers;
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struct messagebuf
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{
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vector<messagebuf *> &owner;
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vector<char> buf;
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int refs;
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messagebuf(vector<messagebuf *> &owner) : owner(owner), refs(0) {}
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const char *getbuf() { return buf.getbuf(); }
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int length() { return buf.length(); }
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void purge();
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bool equals(const messagebuf &m) const
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{
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return buf.length() == m.buf.length() && !memcmp(buf.getbuf(), m.buf.getbuf(), buf.length());
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}
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bool endswith(const messagebuf &m) const
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{
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return buf.length() >= m.buf.length() && !memcmp(&buf[buf.length() - m.buf.length()], m.buf.getbuf(), m.buf.length());
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}
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void concat(const messagebuf &m)
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{
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if(buf.length() && buf.last() == '\0') buf.pop();
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buf.put(m.buf.getbuf(), m.buf.length());
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}
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};
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vector<messagebuf *> gameserverlists, gbanlists;
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bool updateserverlist = true;
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struct client
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{
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ENetAddress address;
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ENetSocket socket;
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char input[INPUT_LIMIT];
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messagebuf *message;
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vector<char> output;
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int inputpos, outputpos;
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enet_uint32 connecttime, lastinput;
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int servport;
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enet_uint32 lastauth;
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vector<authreq> authreqs;
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bool shouldpurge;
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bool registeredserver;
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client() : message(NULL), inputpos(0), outputpos(0), servport(-1), lastauth(0), shouldpurge(false), registeredserver(false) {}
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};
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vector<client *> clients;
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ENetSocket serversocket = ENET_SOCKET_NULL;
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time_t starttime;
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enet_uint32 servtime = 0;
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void fatal(const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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vfprintf(logfile, fmt, args);
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fputc('\n', logfile);
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va_end(args);
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exit(EXIT_FAILURE);
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}
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void conoutfv(int type, const char *fmt, va_list args)
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{
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vfprintf(logfile, fmt, args);
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fputc('\n', logfile);
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}
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void conoutf(const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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conoutfv(CON_INFO, fmt, args);
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va_end(args);
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}
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void conoutf(int type, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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conoutfv(type, fmt, args);
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va_end(args);
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}
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void purgeclient(int n)
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{
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client &c = *clients[n];
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if(c.message) c.message->purge();
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enet_socket_destroy(c.socket);
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delete clients[n];
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clients.remove(n);
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}
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void output(client &c, const char *msg, int len = 0)
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{
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if(!len) len = strlen(msg);
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c.output.put(msg, len);
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}
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void outputf(client &c, const char *fmt, ...)
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{
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defvformatstring(msg, fmt, fmt);
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output(c, msg);
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}
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ENetSocket pingsocket = ENET_SOCKET_NULL;
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bool setuppingsocket(ENetAddress *address)
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{
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if(pingsocket != ENET_SOCKET_NULL) return true;
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pingsocket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
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if(pingsocket == ENET_SOCKET_NULL) return false;
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if(address && enet_socket_bind(pingsocket, address) < 0) return false;
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enet_socket_set_option(pingsocket, ENET_SOCKOPT_NONBLOCK, 1);
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return true;
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}
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void setupserver(int port, const char *ip = NULL)
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{
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ENetAddress address;
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address.host = ENET_HOST_ANY;
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address.port = port;
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if(ip)
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{
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if(enet_address_set_host(&address, ip)<0)
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fatal("failed to resolve server address: %s", ip);
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}
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serversocket = enet_socket_create(ENET_SOCKET_TYPE_STREAM);
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if(serversocket==ENET_SOCKET_NULL ||
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enet_socket_set_option(serversocket, ENET_SOCKOPT_REUSEADDR, 1) < 0 ||
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enet_socket_bind(serversocket, &address) < 0 ||
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enet_socket_listen(serversocket, -1) < 0)
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fatal("failed to create server socket");
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if(enet_socket_set_option(serversocket, ENET_SOCKOPT_NONBLOCK, 1)<0)
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fatal("failed to make server socket non-blocking");
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if(!setuppingsocket(&address))
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fatal("failed to create ping socket");
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enet_time_set(0);
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starttime = time(NULL);
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char *ct = ctime(&starttime);
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if(strchr(ct, '\n')) *strchr(ct, '\n') = '\0';
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conoutf("*** Starting master server on %s %d at %s ***", ip ? ip : "localhost", port, ct);
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}
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void genserverlist()
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{
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if(!updateserverlist) return;
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while(gameserverlists.length() && gameserverlists.last()->refs<=0)
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delete gameserverlists.pop();
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messagebuf *l = new messagebuf(gameserverlists);
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loopv(gameservers)
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{
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gameserver &s = *gameservers[i];
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if(!s.lastpong) continue;
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defformatstring(cmd, "addserver %s %d\n", s.ip, s.port);
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l->buf.put(cmd, strlen(cmd));
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}
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l->buf.add('\0');
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gameserverlists.add(l);
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updateserverlist = false;
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}
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void gengbanlist()
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{
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messagebuf *l = new messagebuf(gbanlists);
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const char *header = "cleargbans\n";
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l->buf.put(header, strlen(header));
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string cmd = "addgban ";
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int cmdlen = strlen(cmd);
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loopv(gbans)
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{
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ipmask &b = gbans[i];
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l->buf.put(cmd, cmdlen + b.print(&cmd[cmdlen]));
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l->buf.add('\n');
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}
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if(gbanlists.length() && gbanlists.last()->equals(*l))
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{
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delete l;
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return;
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}
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while(gbanlists.length() && gbanlists.last()->refs<=0)
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delete gbanlists.pop();
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loopv(gbanlists)
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{
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messagebuf *m = gbanlists[i];
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if(m->refs > 0 && !m->endswith(*l)) m->concat(*l);
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}
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gbanlists.add(l);
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loopv(clients)
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{
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client &c = *clients[i];
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if(c.servport >= 0 && !c.message)
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{
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c.message = l;
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c.message->refs++;
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}
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}
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}
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void addgameserver(client &c)
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{
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if(gameservers.length() >= SERVER_LIMIT) return;
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int dups = 0;
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loopv(gameservers)
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{
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gameserver &s = *gameservers[i];
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if(s.address.host != c.address.host) continue;
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++dups;
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if(s.port == c.servport)
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{
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s.lastping = 0;
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s.numpings = 0;
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return;
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}
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}
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if(dups >= SERVER_DUP_LIMIT)
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{
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outputf(c, "failreg too many servers on ip\n");
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return;
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}
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string hostname;
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if(enet_address_get_host_ip(&c.address, hostname, sizeof(hostname)) < 0)
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{
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outputf(c, "failreg failed resolving ip\n");
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return;
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}
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gameserver &s = *gameservers.add(new gameserver);
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s.address.host = c.address.host;
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s.address.port = c.servport;
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copystring(s.ip, hostname);
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s.port = c.servport;
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s.numpings = 0;
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s.lastping = s.lastpong = 0;
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}
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client *findclient(gameserver &s)
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{
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loopv(clients)
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{
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client &c = *clients[i];
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if(s.address.host == c.address.host && s.port == c.servport)
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return &c;
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}
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return NULL;
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}
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void servermessage(gameserver &s, const char *msg)
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{
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client *c = findclient(s);
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if(c) outputf(*c, msg);
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}
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void checkserverpongs()
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{
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ENetBuffer buf;
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ENetAddress addr;
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static uchar pong[MAXTRANS];
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for(;;)
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{
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buf.data = pong;
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buf.dataLength = sizeof(pong);
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int len = enet_socket_receive(pingsocket, &addr, &buf, 1);
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if(len <= 0) break;
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loopv(gameservers)
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{
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gameserver &s = *gameservers[i];
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if(s.address.host == addr.host && s.address.port == addr.port)
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{
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if(s.lastping && (!s.lastpong || ENET_TIME_GREATER(s.lastping, s.lastpong)))
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{
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client *c = findclient(s);
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if(c)
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{
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c->registeredserver = true;
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outputf(*c, "succreg\n");
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if(!c->message && gbanlists.length())
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{
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c->message = gbanlists.last();
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c->message->refs++;
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}
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}
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}
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if(!s.lastpong) updateserverlist = true;
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s.lastpong = servtime ? servtime : 1;
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break;
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}
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}
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}
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}
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void bangameservers()
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{
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loopvrev(gameservers) if(checkban(servbans, gameservers[i]->address.host))
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{
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delete gameservers.remove(i);
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updateserverlist = true;
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}
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}
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void checkgameservers()
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{
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ENetBuffer buf;
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loopv(gameservers)
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{
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gameserver &s = *gameservers[i];
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if(s.lastping && s.lastpong && ENET_TIME_LESS_EQUAL(s.lastping, s.lastpong))
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{
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if(ENET_TIME_DIFFERENCE(servtime, s.lastpong) > KEEPALIVE_TIME)
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{
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delete gameservers.remove(i--);
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updateserverlist = true;
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}
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}
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else if(!s.lastping || ENET_TIME_DIFFERENCE(servtime, s.lastping) > PING_TIME)
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{
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if(s.numpings >= PING_RETRY)
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{
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servermessage(s, "failreg failed pinging server\n");
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delete gameservers.remove(i--);
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updateserverlist = true;
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}
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else
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{
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static const uchar ping[] = { 0xFF, 0xFF, 1 };
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buf.data = (void *)ping;
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buf.dataLength = sizeof(ping);
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s.numpings++;
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s.lastping = servtime ? servtime : 1;
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enet_socket_send(pingsocket, &s.address, &buf, 1);
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}
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}
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}
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}
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void messagebuf::purge()
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{
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refs = max(refs - 1, 0);
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if(refs<=0 && owner.last()!=this)
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{
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owner.removeobj(this);
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delete this;
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}
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}
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void purgeauths(client &c)
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{
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int expired = 0;
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loopv(c.authreqs)
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{
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if(ENET_TIME_DIFFERENCE(servtime, c.authreqs[i].reqtime) >= AUTH_TIME)
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{
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outputf(c, "failauth %u\n", c.authreqs[i].id);
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freechallenge(c.authreqs[i].answer);
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expired = i + 1;
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}
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else break;
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}
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if(expired > 0) c.authreqs.remove(0, expired);
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}
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void reqauth(client &c, uint id, char *name)
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{
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if(ENET_TIME_DIFFERENCE(servtime, c.lastauth) < AUTH_THROTTLE)
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return;
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c.lastauth = servtime;
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purgeauths(c);
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time_t t = time(NULL);
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char *ct = ctime(&t);
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if(ct)
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{
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char *newline = strchr(ct, '\n');
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if(newline) *newline = '\0';
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}
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string ip;
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if(enet_address_get_host_ip(&c.address, ip, sizeof(ip)) < 0) copystring(ip, "-");
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conoutf("%s: attempting \"%s\" as %u from %s", ct ? ct : "-", name, id, ip);
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userinfo *u = users.access(name);
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if(!u)
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{
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outputf(c, "failauth %u\n", id);
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return;
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}
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if(c.authreqs.length() >= AUTH_LIMIT)
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{
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outputf(c, "failauth %u\n", c.authreqs[0].id);
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freechallenge(c.authreqs[0].answer);
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c.authreqs.remove(0);
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}
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authreq &a = c.authreqs.add();
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a.reqtime = servtime;
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a.id = id;
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uint seed[3] = { uint(starttime), servtime, randomMT() };
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static vector<char> buf;
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buf.setsize(0);
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a.answer = genchallenge(u->pubkey, seed, sizeof(seed), buf);
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outputf(c, "chalauth %u %s\n", id, buf.getbuf());
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}
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void confauth(client &c, uint id, const char *val)
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{
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purgeauths(c);
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loopv(c.authreqs) if(c.authreqs[i].id == id)
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{
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string ip;
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if(enet_address_get_host_ip(&c.address, ip, sizeof(ip)) < 0) copystring(ip, "-");
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if(checkchallenge(val, c.authreqs[i].answer))
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{
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outputf(c, "succauth %u\n", id);
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conoutf("succeeded %u from %s", id, ip);
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}
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else
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{
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outputf(c, "failauth %u\n", id);
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conoutf("failed %u from %s", id, ip);
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}
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freechallenge(c.authreqs[i].answer);
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c.authreqs.remove(i--);
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return;
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}
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outputf(c, "failauth %u\n", id);
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}
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bool checkclientinput(client &c)
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{
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if(c.inputpos<0) return true;
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char *end = (char *)memchr(c.input, '\n', c.inputpos);
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while(end)
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{
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*end++ = '\0';
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c.lastinput = servtime;
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|
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int port;
|
|
uint id;
|
|
string user, val;
|
|
if(!strncmp(c.input, "list", 4) && (!c.input[4] || c.input[4] == '\n' || c.input[4] == '\r'))
|
|
{
|
|
genserverlist();
|
|
if(gameserverlists.empty() || c.message) return false;
|
|
c.message = gameserverlists.last();
|
|
c.message->refs++;
|
|
c.output.setsize(0);
|
|
c.outputpos = 0;
|
|
c.shouldpurge = true;
|
|
return true;
|
|
}
|
|
else if(sscanf(c.input, "regserv %d", &port) == 1)
|
|
{
|
|
if(checkban(servbans, c.address.host)) return false;
|
|
if(port < 0 || port > 0xFFFF || (c.servport >= 0 && port != c.servport)) outputf(c, "failreg invalid port\n");
|
|
else
|
|
{
|
|
c.servport = port;
|
|
addgameserver(c);
|
|
}
|
|
}
|
|
else if(sscanf(c.input, "reqauth %u %100s", &id, user) == 2)
|
|
{
|
|
reqauth(c, id, user);
|
|
}
|
|
else if(sscanf(c.input, "confauth %u %100s", &id, val) == 2)
|
|
{
|
|
confauth(c, id, val);
|
|
}
|
|
c.inputpos = &c.input[c.inputpos] - end;
|
|
memmove(c.input, end, c.inputpos);
|
|
|
|
end = (char *)memchr(c.input, '\n', c.inputpos);
|
|
}
|
|
return c.inputpos<(int)sizeof(c.input);
|
|
}
|
|
|
|
ENetSocketSet readset, writeset;
|
|
|
|
void checkclients()
|
|
{
|
|
ENetSocketSet readset, writeset;
|
|
ENetSocket maxsock = max(serversocket, pingsocket);
|
|
ENET_SOCKETSET_EMPTY(readset);
|
|
ENET_SOCKETSET_EMPTY(writeset);
|
|
ENET_SOCKETSET_ADD(readset, serversocket);
|
|
ENET_SOCKETSET_ADD(readset, pingsocket);
|
|
loopv(clients)
|
|
{
|
|
client &c = *clients[i];
|
|
if(c.authreqs.length()) purgeauths(c);
|
|
if(c.message || c.output.length()) ENET_SOCKETSET_ADD(writeset, c.socket);
|
|
else ENET_SOCKETSET_ADD(readset, c.socket);
|
|
maxsock = max(maxsock, c.socket);
|
|
}
|
|
if(enet_socketset_select(maxsock, &readset, &writeset, 1000)<=0) return;
|
|
|
|
if(ENET_SOCKETSET_CHECK(readset, pingsocket)) checkserverpongs();
|
|
if(ENET_SOCKETSET_CHECK(readset, serversocket))
|
|
{
|
|
ENetAddress address;
|
|
ENetSocket clientsocket = enet_socket_accept(serversocket, &address);
|
|
if(clients.length()>=CLIENT_LIMIT || checkban(bans, address.host)) enet_socket_destroy(clientsocket);
|
|
else if(clientsocket!=ENET_SOCKET_NULL)
|
|
{
|
|
int dups = 0, oldest = -1;
|
|
loopv(clients) if(clients[i]->address.host == address.host)
|
|
{
|
|
dups++;
|
|
if(oldest<0 || clients[i]->connecttime < clients[oldest]->connecttime) oldest = i;
|
|
}
|
|
if(dups >= DUP_LIMIT) purgeclient(oldest);
|
|
|
|
client *c = new client;
|
|
c->address = address;
|
|
c->socket = clientsocket;
|
|
c->connecttime = servtime;
|
|
c->lastinput = servtime;
|
|
clients.add(c);
|
|
}
|
|
}
|
|
|
|
loopv(clients)
|
|
{
|
|
client &c = *clients[i];
|
|
if((c.message || c.output.length()) && ENET_SOCKETSET_CHECK(writeset, c.socket))
|
|
{
|
|
const char *data = c.output.length() ? c.output.getbuf() : c.message->getbuf();
|
|
int len = c.output.length() ? c.output.length() : c.message->length();
|
|
ENetBuffer buf;
|
|
buf.data = (void *)&data[c.outputpos];
|
|
buf.dataLength = len-c.outputpos;
|
|
int res = enet_socket_send(c.socket, NULL, &buf, 1);
|
|
if(res>=0)
|
|
{
|
|
c.outputpos += res;
|
|
if(c.outputpos>=len)
|
|
{
|
|
if(c.output.length()) c.output.setsize(0);
|
|
else
|
|
{
|
|
c.message->purge();
|
|
c.message = NULL;
|
|
}
|
|
c.outputpos = 0;
|
|
if(!c.message && c.output.empty() && c.shouldpurge)
|
|
{
|
|
purgeclient(i--);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
else { purgeclient(i--); continue; }
|
|
}
|
|
if(ENET_SOCKETSET_CHECK(readset, c.socket))
|
|
{
|
|
ENetBuffer buf;
|
|
buf.data = &c.input[c.inputpos];
|
|
buf.dataLength = sizeof(c.input) - c.inputpos;
|
|
int res = enet_socket_receive(c.socket, NULL, &buf, 1);
|
|
if(res>0)
|
|
{
|
|
c.inputpos += res;
|
|
c.input[min(c.inputpos, (int)sizeof(c.input)-1)] = '\0';
|
|
if(!checkclientinput(c)) { purgeclient(i--); continue; }
|
|
}
|
|
else { purgeclient(i--); continue; }
|
|
}
|
|
if(c.output.length() > OUTPUT_LIMIT) { purgeclient(i--); continue; }
|
|
if(ENET_TIME_DIFFERENCE(servtime, c.lastinput) >= (c.registeredserver ? KEEPALIVE_TIME : CLIENT_TIME)) { purgeclient(i--); continue; }
|
|
}
|
|
}
|
|
|
|
void banclients()
|
|
{
|
|
loopvrev(clients) if(checkban(bans, clients[i]->address.host)) purgeclient(i);
|
|
}
|
|
|
|
volatile int reloadcfg = 1;
|
|
|
|
#ifndef WIN32
|
|
void reloadsignal(int signum)
|
|
{
|
|
reloadcfg = 1;
|
|
}
|
|
#endif
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if(enet_initialize()<0) fatal("Unable to initialise network module");
|
|
atexit(enet_deinitialize);
|
|
|
|
const char *dir = "", *ip = NULL;
|
|
int port = 41999;
|
|
if(argc>=2) dir = argv[1];
|
|
if(argc>=3) port = atoi(argv[2]);
|
|
if(argc>=4) ip = argv[3];
|
|
defformatstring(logname, "%smaster.log", dir);
|
|
defformatstring(cfgname, "%smaster.cfg", dir);
|
|
path(logname);
|
|
path(cfgname);
|
|
logfile = fopen(logname, "a");
|
|
if(!logfile) logfile = stdout;
|
|
setvbuf(logfile, NULL, _IOLBF, BUFSIZ);
|
|
#ifndef WIN32
|
|
signal(SIGUSR1, reloadsignal);
|
|
#endif
|
|
setupserver(port, ip);
|
|
for(;;)
|
|
{
|
|
if(reloadcfg)
|
|
{
|
|
conoutf("reloading %s", cfgname);
|
|
execfile(cfgname);
|
|
bangameservers();
|
|
banclients();
|
|
gengbanlist();
|
|
reloadcfg = 0;
|
|
}
|
|
|
|
servtime = enet_time_get();
|
|
checkclients();
|
|
checkgameservers();
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|