/* * Protocol of online ban list: * * - Reporting a ban: * GET g_ban_sync_uri?action=ban&hostname=...&ip=xxx.xxx.xxx&duration=nnnn&reason=................... * (IP 1, 2, 3, or 4 octets, 3 octets for example is a /24 mask) * - Removing a ban: * GET g_ban_sync_uri?action=unban&hostname=...&ip=xxx.xxx.xxx * - Querying the ban list * GET g_ban_sync_uri?action=list&hostname=...&servers=xxx.xxx.xxx.xxx;xxx.xxx.xxx.xxx;... * * shows the bans from the listed servers, and possibly others. * Format of a ban is ASCII plain text, four lines per ban, delimited by * newline ONLY (no carriage return): * * IP address (also 1, 2, 3, or 4 octets, delimited by dot) * time left in seconds * reason of the ban * server IP that registered the ban */ float Ban_Insert(string ip, float bantime, string reason, float dosync); void OnlineBanList_SendBan(string ip, float bantime, string reason) { string uri; float i, n; uri = strcat( "?action=ban&hostname=", uri_escape(cvar_string("hostname"))); uri = strcat(uri, "&ip=", uri_escape(ip)); uri = strcat(uri, "&duration=", ftos(bantime)); uri = strcat(uri, "&reason=", uri_escape(reason)); n = tokenize_console(cvar_string("g_ban_sync_uri")); if(n >= MAX_IPBAN_URIS) n = MAX_IPBAN_URIS; for(i = 0; i < n; ++i) uri_get(strcat(argv(i), uri), URI_GET_DISCARD); // 0 = "discard" callback target } void OnlineBanList_SendUnban(string ip) { string uri; float i, n; uri = strcat( "?action=unban&hostname=", uri_escape(cvar_string("hostname"))); uri = strcat(uri, "&ip=", uri_escape(ip)); n = tokenize_console(cvar_string("g_ban_sync_uri")); if(n >= MAX_IPBAN_URIS) n = MAX_IPBAN_URIS; for(i = 0; i < n; ++i) uri_get(strcat(argv(i), uri), URI_GET_DISCARD); // 0 = "discard" callback target } string OnlineBanList_Servers; float OnlineBanList_Timeout; float OnlineBanList_RequestWaiting[MAX_IPBAN_URIS]; void OnlineBanList_URI_Get_Callback(float id, float status, string data) { float n, i, j, l; string ip; float timeleft; string reason; string serverip; float syncinterval; string uri; id -= URI_GET_IPBAN; if(id >= MAX_IPBAN_URIS) { print("Received ban list for invalid ID\n"); return; } tokenize_console(cvar_string("g_ban_sync_uri")); uri = argv(id); print("Received ban list from ", uri, ": "); if(OnlineBanList_RequestWaiting[id] == 0) { print("rejected (unexpected)\n"); return; } OnlineBanList_RequestWaiting[id] = 0; if(time > OnlineBanList_Timeout) { print("rejected (too late)\n"); return; } syncinterval = cvar("g_ban_sync_interval"); if(syncinterval == 0) { print("rejected (syncing disabled)\n"); return; } if(syncinterval > 0) syncinterval *= 60; if(status != 0) { print("error: status is ", ftos(status), "\n"); return; } if(substring(data, 0, 1) == "<") { print("error: received HTML instead of a ban list: "); return; } if(strstrofs(data, "\r", 0) != -1) { print("error: received carriage returns: "); return; } if(data == "") n = 0; else n = tokenizebyseparator(data, "\n"); if(mod(n, 4) != 0) { print("error: received invalid item count: ", ftos(n), "\n"); return; } print("OK, ", ftos(n / 4), " items\n"); for(i = 0; i < n; i += 4) { ip = argv(i); timeleft = stof(argv(i + 1)); reason = argv(i + 2); serverip = argv(i + 3); dprint("received ban list item ", ftos(i / 4), ": ip=", ip); dprint(" timeleft=", ftos(timeleft), " reason=", reason); dprint(" serverip=", serverip, "\n"); timeleft -= 1.5 * cvar("g_ban_sync_timeout"); if(timeleft < 0) continue; l = strlen(ip); for(j = 0; j < l; ++j) if(strstrofs("0123456789.", substring(ip, j, 1), 0) == -1) { print("Invalid character ", substring(ip, j, 1), " in IP address ", ip, ". Skipping this ban.\n"); goto skip; } if(cvar("g_ban_sync_trusted_servers_verify")) if((strstrofs(strcat(";", OnlineBanList_Servers, ";"), strcat(";", serverip, ";"), 0) == -1)) continue; if(syncinterval > 0) timeleft = min(syncinterval + (OnlineBanList_Timeout - time) + 5, timeleft); // the ban will be prolonged on the next sync // or expire 5 seconds after the next timeout Ban_Insert(ip, timeleft, strcat("ban synced from ", serverip, " at ", uri), 0); print("Ban list syncing: accepted ban of ", ip, " by ", serverip, " at ", uri, ": "); print(reason, "\n"); :skip } } void OnlineBanList_Think() { float argc; string uri; float i, n; if(cvar_string("g_ban_sync_uri") == "") goto killme; if(cvar("g_ban_sync_interval") == 0) // < 0 is okay, it means "sync on level start only" goto killme; argc = tokenize_console(cvar_string("g_ban_sync_trusted_servers")); if(argc == 0) goto killme; if(OnlineBanList_Servers) strunzone(OnlineBanList_Servers); OnlineBanList_Servers = argv(0); for(i = 1; i < argc; ++i) OnlineBanList_Servers = strcat(OnlineBanList_Servers, ";", argv(i)); OnlineBanList_Servers = strzone(OnlineBanList_Servers); uri = strcat( "?action=list&hostname=", uri_escape(cvar_string("hostname"))); uri = strcat(uri, "&servers=", uri_escape(OnlineBanList_Servers)); OnlineBanList_Timeout = time + cvar("g_ban_sync_timeout"); n = tokenize_console(cvar_string("g_ban_sync_uri")); if(n >= MAX_IPBAN_URIS) n = MAX_IPBAN_URIS; for(i = 0; i < n; ++i) { if(OnlineBanList_RequestWaiting[i]) continue; OnlineBanList_RequestWaiting[i] = 1; uri_get(strcat(argv(i), uri), URI_GET_IPBAN + i); // 1000 = "banlist" callback target } if(cvar("g_ban_sync_interval") > 0) self.nextthink = time + max(60, cvar("g_ban_sync_interval") * 60); else goto killme; return; :killme remove(self); } #define BAN_MAX 64 float ban_loaded; string ban_ip[BAN_MAX]; float ban_expire[BAN_MAX]; float ban_count; string ban_ip1; string ban_ip2; string ban_ip3; string ban_ip4; void Ban_SaveBans() { string out; float i; if(!ban_loaded) return; // version of list out = "1"; for(i = 0; i < ban_count; ++i) { if(time > ban_expire[i]) continue; out = strcat(out, " ", ban_ip[i]); out = strcat(out, " ", ftos(ban_expire[i] - time)); } if(strlen(out) <= 1) // no real entries cvar_set("g_banned_list", ""); else cvar_set("g_banned_list", out); } float Ban_Delete(float i) { if(i < 0) return FALSE; if(i >= ban_count) return FALSE; if(ban_expire[i] == 0) return FALSE; if(ban_expire[i] > 0) { OnlineBanList_SendUnban(ban_ip[i]); strunzone(ban_ip[i]); } ban_expire[i] = 0; ban_ip[i] = ""; Ban_SaveBans(); return TRUE; } void Ban_LoadBans() { float i, n; for(i = 0; i < ban_count; ++i) Ban_Delete(i); ban_count = 0; ban_loaded = TRUE; n = tokenize_console(cvar_string("g_banned_list")); if(stof(argv(0)) == 1) { ban_count = (n - 1) / 2; for(i = 0; i < ban_count; ++i) { ban_ip[i] = strzone(argv(2*i+1)); ban_expire[i] = time + stof(argv(2*i+2)); } } entity e; e = spawn(); e.classname = "bansyncer"; e.think = OnlineBanList_Think; e.nextthink = time + 1; } void Ban_View() { float i; string msg; for(i = 0; i < ban_count; ++i) { if(time > ban_expire[i]) continue; msg = strcat("#", ftos(i), ": "); msg = strcat(msg, ban_ip[i], " is still banned for "); msg = strcat(msg, ftos(ban_expire[i] - time), " seconds"); print(msg, "\n"); } } float Ban_GetClientIP(entity client) { // we can't use tokenizing here, as this is called during ban list parsing float i1, i2, i3, i4; string s; s = client.netaddress; i1 = strstrofs(s, ".", 0); if(i1 < 0) return FALSE; i2 = strstrofs(s, ".", i1 + 1); if(i2 < 0) return FALSE; i3 = strstrofs(s, ".", i2 + 1); if(i3 < 0) return FALSE; i4 = strstrofs(s, ".", i3 + 1); if(i4 >= 0) return FALSE; ban_ip1 = substring(s, 0, i1); ban_ip2 = substring(s, 0, i2); ban_ip3 = substring(s, 0, i3); ban_ip4 = strcat1(s); return TRUE; } float Ban_IsClientBanned(entity client, float idx) { float i, b, e; if(!ban_loaded) Ban_LoadBans(); if(!Ban_GetClientIP(client)) return FALSE; if(idx < 0) { b = 0; e = ban_count; } else { b = idx; e = idx + 1; } for(i = b; i < e; ++i) { string s; if(time > ban_expire[i]) continue; s = ban_ip[i]; if(ban_ip1 == s) return TRUE; if(ban_ip2 == s) return TRUE; if(ban_ip3 == s) return TRUE; if(ban_ip4 == s) return TRUE; } return FALSE; } float Ban_MaybeEnforceBan(entity client) { if(Ban_IsClientBanned(client, -1)) { string s; s = strcat("^1NOTE:^7 banned client ", client.netaddress, " just tried to enter\n"); dropclient(client); bprint(s); return TRUE; } return FALSE; } string Ban_Enforce(float i, string reason) { string s; entity e; // Enforce our new ban s = ""; FOR_EACH_REALCLIENT(e) if(Ban_IsClientBanned(e, i)) { if(reason != "") { if(s == "") reason = strcat(reason, ": affects "); else reason = strcat(reason, ", "); reason = strcat(reason, e.netname); } s = strcat(s, "^1NOTE:^7 banned client ", e.netname, "^7 has to go\n"); dropclient(e); } bprint(s); return reason; } float Ban_Insert(string ip, float bantime, string reason, float dosync) { float i; float j; float bestscore; // already banned? for(i = 0; i < ban_count; ++i) if(ban_ip[i] == ip) { // prolong the ban if(time + bantime > ban_expire[i]) { ban_expire[i] = time + bantime; dprint(ip, "'s ban has been prolonged to ", ftos(bantime), " seconds from now\n"); } else dprint(ip, "'s ban is still active until ", ftos(ban_expire[i] - time), " seconds from now\n"); // and enforce reason = Ban_Enforce(i, reason); // and abort if(dosync) if(reason != "") if(substring(reason, 0, 1) != "~") // like IRC: unauthenticated banner OnlineBanList_SendBan(ip, bantime, reason); return FALSE; } // do we have a free slot? for(i = 0; i < ban_count; ++i) if(time > ban_expire[i]) break; // no free slot? Then look for the one who would get unbanned next if(i >= BAN_MAX) { i = 0; bestscore = ban_expire[i]; for(j = 1; j < ban_count; ++j) { if(ban_expire[j] < bestscore) { i = j; bestscore = ban_expire[i]; } } } // if we replace someone, will we be banned longer than him (so long-term // bans never get overridden by short-term bans) if(i < ban_count) if(ban_expire[i] > time + bantime) { print(ip, " could not get banned due to no free ban slot\n"); return FALSE; } // okay, insert our new victim as i Ban_Delete(i); dprint(ip, " has been banned for ", ftos(bantime), " seconds\n"); ban_expire[i] = time + bantime; ban_ip[i] = strzone(ip); ban_count = max(ban_count, i + 1); Ban_SaveBans(); reason = Ban_Enforce(i, reason); // and abort if(dosync) if(reason != "") if(substring(reason, 0, 1) != "~") // like IRC: unauthenticated banner OnlineBanList_SendBan(ip, bantime, reason); return TRUE; } void Ban_KickBanClient(entity client, float bantime, float masksize, string reason) { if(!Ban_GetClientIP(client)) { sprint(client, strcat("Kickbanned: ", reason, "\n")); dropclient(client); return; } // now ban him switch(masksize) { case 1: Ban_Insert(ban_ip1, bantime, reason, 1); break; case 2: Ban_Insert(ban_ip2, bantime, reason, 1); break; case 3: Ban_Insert(ban_ip3, bantime, reason, 1); break; default: Ban_Insert(ban_ip4, bantime, reason, 1); break; } /* * not needed, as we enforce the ban in Ban_Insert anyway // and kick him sprint(client, strcat("Kickbanned: ", reason, "\n")); dropclient(client); */ } float GameCommand_Ban(string command) { float argc; float bantime; entity client; float entno; float masksize; string reason; float reasonarg; argc = tokenize_console(command); if(argv(0) == "help") { print(" kickban # n m p reason - kickban player n for m seconds, using mask size p (1 to 4)\n"); print(" ban ip m reason - ban an IP or range (incomplete IP, like 1.2.3) for m seconds\n"); print(" bans - list all existing bans\n"); print(" unban n - delete the entry #n from the bans list\n"); return TRUE; } if(argv(0) == "kickban") { #define INITARG(c) reasonarg = c #define GETARG(v,d) if((argc > reasonarg) && ((v = stof(argv(reasonarg))) != 0)) ++reasonarg; else v = d #define RESTARG(v) if(argc > reasonarg) v = substring(command, argv_start_index(reasonarg), strlen(command) - argv_start_index(reasonarg)); else v = "" if(argc >= 3) { entno = stof(argv(2)); if(entno > maxclients || entno < 1) return TRUE; client = edict_num(entno); INITARG(3); GETARG(bantime, cvar("g_ban_default_bantime")); GETARG(masksize, cvar("g_ban_default_masksize")); RESTARG(reason); Ban_KickBanClient(client, bantime, masksize, reason); return TRUE; } } else if(argv(0) == "ban") { if(argc >= 2) { string ip; ip = argv(1); INITARG(2); GETARG(bantime, cvar("g_ban_default_bantime")); RESTARG(reason); Ban_Insert(ip, bantime, reason, 1); return TRUE; } #undef INITARG #undef GETARG #undef RESTARG } else if(argv(0) == "bans") { Ban_View(); return TRUE; } else if(argv(0) == "unban") { if(argc >= 2) { float who; who = stof(argv(1)); Ban_Delete(who); return TRUE; } } return FALSE; }