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-rw-r--r--src/engine/master.cpp718
1 files changed, 718 insertions, 0 deletions
diff --git a/src/engine/master.cpp b/src/engine/master.cpp
new file mode 100644
index 0000000..2522e97
--- /dev/null
+++ b/src/engine/master.cpp
@@ -0,0 +1,718 @@
+#ifdef WIN32
+#define FD_SETSIZE 4096
+#else
+#include <sys/types.h>
+#undef __FD_SETSIZE
+#define __FD_SETSIZE 4096
+#endif
+
+#include "cube.h"
+#include <signal.h>
+#include <enet/time.h>
+
+#define INPUT_LIMIT 4096
+#define OUTPUT_LIMIT (64*1024)
+#define CLIENT_TIME (3*60*1000)
+#define AUTH_TIME (30*1000)
+#define AUTH_LIMIT 100
+#define AUTH_THROTTLE 1000
+#define CLIENT_LIMIT 4096
+#define DUP_LIMIT 16
+#define PING_TIME 3000
+#define PING_RETRY 5
+#define KEEPALIVE_TIME (65*60*1000)
+#define SERVER_LIMIT 4096
+#define SERVER_DUP_LIMIT 10
+
+FILE *logfile = NULL;
+
+struct userinfo
+{
+ char *name;
+ void *pubkey;
+};
+hashnameset<userinfo> users;
+
+void adduser(char *name, char *pubkey)
+{
+ name = newstring(name);
+ userinfo &u = users[name];
+ u.name = name;
+ u.pubkey = parsepubkey(pubkey);
+}
+COMMAND(adduser, "ss");
+
+void clearusers()
+{
+ enumerate(users, userinfo, u, { delete[] u.name; freepubkey(u.pubkey); });
+ users.clear();
+}
+COMMAND(clearusers, "");
+
+vector<ipmask> bans, servbans, gbans;
+
+void clearbans()
+{
+ bans.shrink(0);
+ servbans.shrink(0);
+ gbans.shrink(0);
+}
+COMMAND(clearbans, "");
+
+void addban(vector<ipmask> &bans, const char *name)
+{
+ ipmask ban;
+ ban.parse(name);
+ bans.add(ban);
+}
+ICOMMAND(ban, "s", (char *name), addban(bans, name));
+ICOMMAND(servban, "s", (char *name), addban(servbans, name));
+ICOMMAND(gban, "s", (char *name), addban(gbans, name));
+
+bool checkban(vector<ipmask> &bans, enet_uint32 host)
+{
+ loopv(bans) if(bans[i].check(host)) return true;
+ return false;
+}
+
+struct authreq
+{
+ enet_uint32 reqtime;
+ uint id;
+ void *answer;
+};
+
+struct gameserver
+{
+ ENetAddress address;
+ string ip;
+ int port, numpings;
+ enet_uint32 lastping, lastpong;
+};
+vector<gameserver *> gameservers;
+
+struct messagebuf
+{
+ vector<messagebuf *> &owner;
+ vector<char> buf;
+ int refs;
+
+ messagebuf(vector<messagebuf *> &owner) : owner(owner), refs(0) {}
+
+ const char *getbuf() { return buf.getbuf(); }
+ int length() { return buf.length(); }
+ void purge();
+
+ bool equals(const messagebuf &m) const
+ {
+ return buf.length() == m.buf.length() && !memcmp(buf.getbuf(), m.buf.getbuf(), buf.length());
+ }
+
+ bool endswith(const messagebuf &m) const
+ {
+ return buf.length() >= m.buf.length() && !memcmp(&buf[buf.length() - m.buf.length()], m.buf.getbuf(), m.buf.length());
+ }
+
+ void concat(const messagebuf &m)
+ {
+ if(buf.length() && buf.last() == '\0') buf.pop();
+ buf.put(m.buf.getbuf(), m.buf.length());
+ }
+};
+vector<messagebuf *> gameserverlists, gbanlists;
+bool updateserverlist = true;
+
+struct client
+{
+ ENetAddress address;
+ ENetSocket socket;
+ char input[INPUT_LIMIT];
+ messagebuf *message;
+ vector<char> output;
+ int inputpos, outputpos;
+ enet_uint32 connecttime, lastinput;
+ int servport;
+ enet_uint32 lastauth;
+ vector<authreq> authreqs;
+ bool shouldpurge;
+ bool registeredserver;
+
+ client() : message(NULL), inputpos(0), outputpos(0), servport(-1), lastauth(0), shouldpurge(false), registeredserver(false) {}
+};
+vector<client *> clients;
+
+ENetSocket serversocket = ENET_SOCKET_NULL;
+
+time_t starttime;
+enet_uint32 servtime = 0;
+
+void fatal(const char *fmt, ...)
+{
+ va_list args;
+ va_start(args, fmt);
+ vfprintf(logfile, fmt, args);
+ fputc('\n', logfile);
+ va_end(args);
+ exit(EXIT_FAILURE);
+}
+
+void conoutfv(int type, const char *fmt, va_list args)
+{
+ vfprintf(logfile, fmt, args);
+ fputc('\n', logfile);
+}
+
+void purgeclient(int n)
+{
+ client &c = *clients[n];
+ if(c.message) c.message->purge();
+ enet_socket_destroy(c.socket);
+ delete clients[n];
+ clients.remove(n);
+}
+
+void output(client &c, const char *msg, int len = 0)
+{
+ if(!len) len = strlen(msg);
+ c.output.put(msg, len);
+}
+
+void outputf(client &c, const char *fmt, ...)
+{
+ string msg;
+ va_list args;
+ va_start(args, fmt);
+ vformatstring(msg, fmt, args);
+ va_end(args);
+
+ output(c, msg);
+}
+
+ENetSocket pingsocket = ENET_SOCKET_NULL;
+
+bool setuppingsocket(ENetAddress *address)
+{
+ if(pingsocket != ENET_SOCKET_NULL) return true;
+ pingsocket = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
+ if(pingsocket == ENET_SOCKET_NULL) return false;
+ if(address && enet_socket_bind(pingsocket, address) < 0) return false;
+ enet_socket_set_option(pingsocket, ENET_SOCKOPT_NONBLOCK, 1);
+ return true;
+}
+
+void setupserver(int port, const char *ip = NULL)
+{
+ ENetAddress address;
+ address.host = ENET_HOST_ANY;
+ address.port = port;
+
+ if(ip)
+ {
+ if(enet_address_set_host(&address, ip)<0)
+ fatal("failed to resolve server address: %s", ip);
+ }
+ serversocket = enet_socket_create(ENET_SOCKET_TYPE_STREAM);
+ if(serversocket==ENET_SOCKET_NULL ||
+ enet_socket_set_option(serversocket, ENET_SOCKOPT_REUSEADDR, 1) < 0 ||
+ enet_socket_bind(serversocket, &address) < 0 ||
+ enet_socket_listen(serversocket, -1) < 0)
+ fatal("failed to create server socket");
+ if(enet_socket_set_option(serversocket, ENET_SOCKOPT_NONBLOCK, 1)<0)
+ fatal("failed to make server socket non-blocking");
+ if(!setuppingsocket(&address))
+ fatal("failed to create ping socket");
+
+ enet_time_set(0);
+
+ starttime = time(NULL);
+ char *ct = ctime(&starttime);
+ if(strchr(ct, '\n')) *strchr(ct, '\n') = '\0';
+ conoutf("*** Starting master server on %s %d at %s ***", ip ? ip : "localhost", port, ct);
+}
+
+void genserverlist()
+{
+ if(!updateserverlist) return;
+ while(gameserverlists.length() && gameserverlists.last()->refs<=0)
+ delete gameserverlists.pop();
+ messagebuf *l = new messagebuf(gameserverlists);
+ loopv(gameservers)
+ {
+ gameserver &s = *gameservers[i];
+ if(!s.lastpong) continue;
+ defformatstring(cmd, "addserver %s %d\n", s.ip, s.port);
+ l->buf.put(cmd, strlen(cmd));
+ }
+ l->buf.add('\0');
+ gameserverlists.add(l);
+ updateserverlist = false;
+}
+
+void gengbanlist()
+{
+ messagebuf *l = new messagebuf(gbanlists);
+ const char *header = "cleargbans\n";
+ l->buf.put(header, strlen(header));
+ string cmd = "addgban ";
+ int cmdlen = strlen(cmd);
+ loopv(gbans)
+ {
+ ipmask &b = gbans[i];
+ l->buf.put(cmd, cmdlen + b.print(&cmd[cmdlen]));
+ l->buf.add('\n');
+ }
+ if(gbanlists.length() && gbanlists.last()->equals(*l))
+ {
+ delete l;
+ return;
+ }
+ while(gbanlists.length() && gbanlists.last()->refs<=0)
+ delete gbanlists.pop();
+ loopv(gbanlists)
+ {
+ messagebuf *m = gbanlists[i];
+ if(m->refs > 0 && !m->endswith(*l)) m->concat(*l);
+ }
+ gbanlists.add(l);
+ loopv(clients)
+ {
+ client &c = *clients[i];
+ if(c.servport >= 0 && !c.message)
+ {
+ c.message = l;
+ c.message->refs++;
+ }
+ }
+}
+
+void addgameserver(client &c)
+{
+ if(gameservers.length() >= SERVER_LIMIT) return;
+ int dups = 0;
+ loopv(gameservers)
+ {
+ gameserver &s = *gameservers[i];
+ if(s.address.host != c.address.host) continue;
+ ++dups;
+ if(s.port == c.servport)
+ {
+ s.lastping = 0;
+ s.numpings = 0;
+ return;
+ }
+ }
+ if(dups >= SERVER_DUP_LIMIT)
+ {
+ outputf(c, "failreg too many servers on ip\n");
+ return;
+ }
+ string hostname;
+ if(enet_address_get_host_ip(&c.address, hostname, sizeof(hostname)) < 0)
+ {
+ outputf(c, "failreg failed resolving ip\n");
+ return;
+ }
+ gameserver &s = *gameservers.add(new gameserver);
+ s.address.host = c.address.host;
+ s.address.port = c.servport+1;
+ copystring(s.ip, hostname);
+ s.port = c.servport;
+ s.numpings = 0;
+ s.lastping = s.lastpong = 0;
+}
+
+client *findclient(gameserver &s)
+{
+ loopv(clients)
+ {
+ client &c = *clients[i];
+ if(s.address.host == c.address.host && s.port == c.servport)
+ return &c;
+ }
+ return NULL;
+}
+
+void servermessage(gameserver &s, const char *msg)
+{
+ client *c = findclient(s);
+ if(c) outputf(*c, msg);
+}
+
+void checkserverpongs()
+{
+ ENetBuffer buf;
+ ENetAddress addr;
+ static uchar pong[MAXTRANS];
+ for(;;)
+ {
+ buf.data = pong;
+ buf.dataLength = sizeof(pong);
+ int len = enet_socket_receive(pingsocket, &addr, &buf, 1);
+ if(len <= 0) break;
+ loopv(gameservers)
+ {
+ gameserver &s = *gameservers[i];
+ if(s.address.host == addr.host && s.address.port == addr.port)
+ {
+ if(s.lastping && (!s.lastpong || ENET_TIME_GREATER(s.lastping, s.lastpong)))
+ {
+ client *c = findclient(s);
+ if(c)
+ {
+ c->registeredserver = true;
+ outputf(*c, "succreg\n");
+ if(!c->message && gbanlists.length())
+ {
+ c->message = gbanlists.last();
+ c->message->refs++;
+ }
+ }
+ }
+ if(!s.lastpong) updateserverlist = true;
+ s.lastpong = servtime ? servtime : 1;
+ break;
+ }
+ }
+ }
+}
+
+void bangameservers()
+{
+ loopvrev(gameservers) if(checkban(servbans, gameservers[i]->address.host))
+ {
+ delete gameservers.remove(i);
+ updateserverlist = true;
+ }
+}
+
+void checkgameservers()
+{
+ ENetBuffer buf;
+ loopv(gameservers)
+ {
+ gameserver &s = *gameservers[i];
+ if(s.lastping && s.lastpong && ENET_TIME_LESS_EQUAL(s.lastping, s.lastpong))
+ {
+ if(ENET_TIME_DIFFERENCE(servtime, s.lastpong) > KEEPALIVE_TIME)
+ {
+ delete gameservers.remove(i--);
+ updateserverlist = true;
+ }
+ }
+ else if(!s.lastping || ENET_TIME_DIFFERENCE(servtime, s.lastping) > PING_TIME)
+ {
+ if(s.numpings >= PING_RETRY)
+ {
+ servermessage(s, "failreg failed pinging server\n");
+ delete gameservers.remove(i--);
+ updateserverlist = true;
+ }
+ else
+ {
+ static const uchar ping[] = { 1 };
+ buf.data = (void *)ping;
+ buf.dataLength = sizeof(ping);
+ s.numpings++;
+ s.lastping = servtime ? servtime : 1;
+ enet_socket_send(pingsocket, &s.address, &buf, 1);
+ }
+ }
+ }
+}
+
+void messagebuf::purge()
+{
+ refs = max(refs - 1, 0);
+ if(refs<=0 && owner.last()!=this)
+ {
+ owner.removeobj(this);
+ delete this;
+ }
+}
+
+void purgeauths(client &c)
+{
+ int expired = 0;
+ loopv(c.authreqs)
+ {
+ if(ENET_TIME_DIFFERENCE(servtime, c.authreqs[i].reqtime) >= AUTH_TIME)
+ {
+ outputf(c, "failauth %u\n", c.authreqs[i].id);
+ freechallenge(c.authreqs[i].answer);
+ expired = i + 1;
+ }
+ else break;
+ }
+ if(expired > 0) c.authreqs.remove(0, expired);
+}
+
+void reqauth(client &c, uint id, char *name)
+{
+ if(ENET_TIME_DIFFERENCE(servtime, c.lastauth) < AUTH_THROTTLE)
+ return;
+
+ c.lastauth = servtime;
+
+ purgeauths(c);
+
+ time_t t = time(NULL);
+ char *ct = ctime(&t);
+ if(ct)
+ {
+ char *newline = strchr(ct, '\n');
+ if(newline) *newline = '\0';
+ }
+ string ip;
+ if(enet_address_get_host_ip(&c.address, ip, sizeof(ip)) < 0) copystring(ip, "-");
+ conoutf("%s: attempting \"%s\" as %u from %s", ct ? ct : "-", name, id, ip);
+
+ userinfo *u = users.access(name);
+ if(!u)
+ {
+ outputf(c, "failauth %u\n", id);
+ return;
+ }
+
+ if(c.authreqs.length() >= AUTH_LIMIT)
+ {
+ outputf(c, "failauth %u\n", c.authreqs[0].id);
+ freechallenge(c.authreqs[0].answer);
+ c.authreqs.remove(0);
+ }
+
+ authreq &a = c.authreqs.add();
+ a.reqtime = servtime;
+ a.id = id;
+ uint seed[3] = { uint(starttime), servtime, randomMT() };
+ static vector<char> buf;
+ buf.setsize(0);
+ a.answer = genchallenge(u->pubkey, seed, sizeof(seed), buf);
+
+ outputf(c, "chalauth %u %s\n", id, buf.getbuf());
+}
+
+void confauth(client &c, uint id, const char *val)
+{
+ purgeauths(c);
+
+ loopv(c.authreqs) if(c.authreqs[i].id == id)
+ {
+ string ip;
+ if(enet_address_get_host_ip(&c.address, ip, sizeof(ip)) < 0) copystring(ip, "-");
+ if(checkchallenge(val, c.authreqs[i].answer))
+ {
+ outputf(c, "succauth %u\n", id);
+ conoutf("succeeded %u from %s", id, ip);
+ }
+ else
+ {
+ outputf(c, "failauth %u\n", id);
+ conoutf("failed %u from %s", id, ip);
+ }
+ freechallenge(c.authreqs[i].answer);
+ c.authreqs.remove(i--);
+ return;
+ }
+ outputf(c, "failauth %u\n", id);
+}
+
+bool checkclientinput(client &c)
+{
+ if(c.inputpos<0) return true;
+ char *end = (char *)memchr(c.input, '\n', c.inputpos);
+ while(end)
+ {
+ *end++ = '\0';
+ c.lastinput = servtime;
+
+ 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-1 || (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 = 28787;
+ 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 master.cfg");
+ execfile(cfgname);
+ bangameservers();
+ banclients();
+ gengbanlist();
+ reloadcfg = 0;
+ }
+
+ servtime = enet_time_get();
+ checkclients();
+ checkgameservers();
+ }
+
+ return EXIT_SUCCESS;
+}
+
generated by cgit v1.2.3 (git 2.46.0) at 2026-02-21 09:24:26 +0000