From: fgsfds Date: Tue, 28 Sep 2021 00:43:50 +0000 (+0300) Subject: master: add anti autism measures X-Git-Url: http://deadsoftware.ru/gitweb?a=commitdiff_plain;h=d5593c39bbce64b1e9866e1c1d8a6e1e4910a14e;p=d2df-sdl.git master: add anti autism measures --- diff --git a/src/mastersrv/master.c b/src/mastersrv/master.c index ca1c129..b6d2cd7 100644 --- a/src/mastersrv/master.c +++ b/src/mastersrv/master.c @@ -7,7 +7,10 @@ #define MS_VERSION "0.2" #define MS_MAXSRVS 128 +#define MS_MAXBANS 256 #define MS_TIMEOUT 100 +#define MS_BANTIME (3 * 86400) +#define MS_MAXHEUR 100 #define NET_CHANS 2 #define NET_CH_MAIN 0 @@ -30,9 +33,27 @@ #define LC_MS_CONN "\nIncoming connection from %x:%u...\n" #define LC_MS_MOTD "\nMOTD: %s\n" #define LC_MS_URGENT "\nURGENT: %s\n" +#define LC_MS_BANNED "\nBanned %s until %s, reason: %s (#%d)\n" +#define LC_MS_NOBANS "\nCould not load ban list from file\n" +#define LC_MS_BADADR "\nBad address in file: %s\n" +#define LC_MS_BANHEUR "tripped heuristic check" +#define LC_MS_BANLIST "address in ban list" +#define LC_MS_OOM "\nOut of memory\n" #define MS_URGENT_FILE "urgent.txt" #define MS_MOTD_FILE "motd.txt" +#define MS_BAN_FILE "master_bans.txt" + +struct ms_ban_s; + +typedef struct ms_ban_record_s { + ENetAddress mask; + char ip[18]; + int ban_count; + time_t cur_ban; + struct ms_ban_record_s *next; + struct ms_ban_record_s *prev; +} ms_ban_record; struct ms_server_s { enet_uint8 used; @@ -46,6 +67,7 @@ struct ms_server_s { enet_uint8 s_protocol; enet_uint16 s_port; time_t deathtime; + time_t lasttime; }; typedef struct ms_server_s ms_server; @@ -64,9 +86,12 @@ enet_uint8 b_send[NET_BUFSIZE]; ENetHost *ms_host = NULL; ENetPeer *ms_peers[NET_MAXCLIENTS]; + ms_server ms_srv[MS_MAXSRVS]; enet_uint8 ms_count = 0; +ms_ban_record *ms_bans; + // fake servers to show on old versions of the game static const ms_server ms_fake_srv[] = { { @@ -92,13 +117,13 @@ static const ms_server ms_fake_srv[] = { #define MS_FAKESRVS (sizeof(ms_fake_srv) / sizeof(ms_fake_srv[0])) -void i_usage () { +void i_usage (void) { printf("Usage: d2df_master -p port_number [-t timeout_seconds]\n"); fflush(stdout); } -void i_version () { +void i_version (void) { printf("Doom 2D Forever master server v%s\n", MS_VERSION); fflush(stdout); } @@ -147,7 +172,7 @@ int d_readtextfile (const char *fname, char *buf, size_t max) { if (f) { char ln[max]; char *const lend = ln + max - 1; - while(p < end && fgets(ln, sizeof(ln), f)) { + while (p < end && fgets(ln, max, f)) { for (char *n = ln; n < lend && *n && *n != '\r' && *n != '\n'; ++n) { *(p++) = *n; if (p == end) break; @@ -161,6 +186,22 @@ int d_readtextfile (const char *fname, char *buf, size_t max) { } +int d_strisprint (const char *str) { + if (!str || !*str) return 0; + for (const char *p = str; p && *p; ++p) + if (isprint(*p) || *p > 0x7f) return 1; + return 0; +} + + +const char *d_strtime(const time_t t) { + static char buf[128]; + struct tm *ptm = localtime(&t); + strftime(buf, sizeof(buf), "%c", ptm); + return buf; +} + + enet_uint8 b_read_uint8 (enet_uint8 buf[], size_t *pos) { return buf[(*pos)++]; } @@ -224,6 +265,180 @@ void b_write_server (enet_uint8 buf[], size_t *pos, ms_server s) { } +time_t ban_get_time(const int cnt) { + static const time_t times[] = { + 1 * 5 * 60, + 1 * 30 * 60, + 1 * 60 * 60, + 24 * 60 * 60, + 72 * 60 * 60, + 8760 * 60 * 60, + }; + + static const size_t numtimes = sizeof(times) / sizeof(*times); + + if (cnt >= numtimes || cnt < 0) + return times[numtimes - 1]; + + return times[cnt]; +} + + +ms_ban_record *ban_check (const ENetAddress *addr) { + const time_t now = time(NULL); + + for (ms_ban_record *b = ms_bans; b; b = b->next) { + if (b->mask.host == addr->host) { + if (b->cur_ban > now) + return b; + } + } + + return NULL; +} + + +ms_ban_record *ban_record_check (const ENetAddress *addr) { + for (ms_ban_record *b = ms_bans; b; b = b->next) { + if (b->mask.host == addr->host) + return b; + } + return NULL; +} + + +ms_ban_record *ban_record_add_addr (const ENetAddress *addr, const int cnt, const time_t cur) { + ms_ban_record *rec = ban_record_check(addr); + if (rec) return rec; + + rec = calloc(1, sizeof(*rec)); + if (!rec) return NULL; + + enet_address_get_host_ip(addr, rec->ip, 17); + rec->mask = *addr; + rec->ban_count = cnt; + rec->cur_ban = cur; + + if (ms_bans) ms_bans->prev = rec; + rec->next = ms_bans; + ms_bans = rec; + + return rec; +} + + +ms_ban_record *ban_record_add_ip (const char *ip, const int cnt, const time_t cur) { + ENetAddress addr; + if (enet_address_set_host_ip(&addr, ip) != 0) { + fprintf(stderr, LC_MS_BADADR, ip); + return NULL; + } + return ban_record_add_addr(&addr, cnt, cur); +} + + +void ban_load_list (const char *fname) { + FILE *f = fopen(fname, "r"); + if (!f) { + d_error(LC_MS_NOBANS, 0); + return; + } + + char ln[256] = { 0 }; + + while (fgets(ln, sizeof(ln), f)) { + for (int i = sizeof(ln) - 1; i >= 0; --i) + if (ln[i] == '\n' || ln[i] == '\r') + ln[i] = 0; + + char ip[17] = { 0 }; + time_t exp = 0; + int count = 0; + + sscanf(ln, "%16s %ld %d", ip, &exp, &count); + + if (ban_record_add_ip(ip, count, exp)) + printf(LC_MS_BANNED, ip, d_strtime(exp), LC_MS_BANLIST, count); + } + + fclose(f); +} + + +void ban_save_list (const char *fname) { + FILE *f = fopen(fname, "w"); + if (!f) { + d_error(LC_MS_NOBANS, 0); + return; + } + + for (ms_ban_record *rec = ms_bans; rec; rec = rec->next) + if (rec->ban_count) + fprintf(f, "%s %ld %d\n", rec->ip, rec->cur_ban, rec->ban_count); + + fclose(f); +} + + +int ban_heur (const ms_server *srv, const time_t now) { + int score = 0; + + // can't have more than 24 maxplayers; can't have more than max + if (srv->s_plrs > srv->s_maxplrs || srv->s_maxplrs > 24) + score += MS_MAXHEUR; + + // name and map have to be non-garbage + if (!d_strisprint(srv->s_map) || !d_strisprint(srv->s_name)) + score += MS_MAXHEUR; + + // these protocols don't exist + if (srv->s_protocol < 100 || srv->s_protocol > 250) + score += MS_MAXHEUR; + + // the game doesn't allow server names longer than 64 chars + if (strlen(srv->s_name) > 64) + score += MS_MAXHEUR; + + // game mode has to actually exist + if (srv->s_mode > 5) + score += MS_MAXHEUR; + + // password field can be either 0 or 1 + if (srv->s_pw > 1) + score += MS_MAXHEUR; + + // port has to be set, although the game allows you to set it to 0 + // if (!srv->s_port) + // score += MS_MAXHEUR; + + // servers usually don't update more often than once every 30 seconds + if (now - srv->lasttime < 5) + score += MS_MAXHEUR / 2; + + return score; +} + + +void ban_add (const ENetAddress *addr, const char *reason) { + const time_t now = time(NULL); + + ms_ban_record *rec = ban_record_add_addr(addr, 0, 0); + if (!rec) d_error(LC_MS_OOM, 1); + + rec->cur_ban = now + ban_get_time(rec->ban_count); + rec->ban_count++; + + printf(LC_MS_BANNED, rec->ip, d_strtime(rec->cur_ban), reason, rec->ban_count); + + ban_save_list(MS_BAN_FILE); +} + + +void d_deinit(void) { + ban_save_list(MS_BAN_FILE); +} + + int main (int argc, char *argv[]) { d_getargs(argc, argv); @@ -236,6 +451,7 @@ int main (int argc, char *argv[]) { d_readtextfile(MS_MOTD_FILE, ms_motd, sizeof(ms_motd)); d_readtextfile(MS_URGENT_FILE, ms_urgent, sizeof(ms_urgent)); + ban_load_list(MS_BAN_FILE); if (ms_motd[0]) printf(LC_MS_MOTD, ms_motd); if (ms_urgent[0]) printf(LC_MS_URGENT, ms_urgent); @@ -260,7 +476,7 @@ int main (int argc, char *argv[]) { return EXIT_FAILURE; } - atexit(enet_deinitialize); + atexit(d_deinit); ENetEvent event; int shutdown = 0; @@ -280,19 +496,24 @@ int main (int argc, char *argv[]) { enet_uint8 pw = 0; while (!shutdown) { while (enet_host_service(ms_host, &event, 5000) > 0) { + if (event.peer && ban_check(&(event.peer->address))) + continue; + + const time_t now = time(NULL); + switch (event.type) { case ENET_EVENT_TYPE_CONNECT: printf(LC_MS_CONN, event.peer->address.host, event.peer->address.port); break; + case ENET_EVENT_TYPE_RECEIVE: if (!event.peer) continue; + b_read = 0; msg = b_read_uint8(event.packet->data, &b_read); switch (msg) { case NET_MSG_ADD: - if (!event.peer) continue; - enet_address_get_host_ip(&(event.peer->address), ip, 17); port = b_read_uint16(event.packet->data, &b_read); @@ -309,6 +530,11 @@ int main (int argc, char *argv[]) { for (int i = 0; i < MS_MAXSRVS; ++i) { if (ms_srv[i].used) { if ((strncmp(ip, ms_srv[i].s_ip, 16) == 0) && (ms_srv[i].s_port == port)) { + if (ban_heur(ms_srv + i, now) >= MS_MAXHEUR) { + ban_add(&(event.peer->address), LC_MS_BANHEUR); + break; + } + strncpy(ms_srv[i].s_map, map, sizeof(ms_srv[i].s_map)); strncpy(ms_srv[i].s_name, name, sizeof(ms_srv[i].s_name)); ms_srv[i].s_plrs = pl; @@ -316,7 +542,8 @@ int main (int argc, char *argv[]) { ms_srv[i].s_pw = pw; ms_srv[i].s_mode = gm; - ms_srv[i].deathtime = time(NULL) + ms_timeout; + ms_srv[i].deathtime = now + ms_timeout; + ms_srv[i].lasttime = now; printf(LC_MS_UPD, i, ip, port, name, map, gm, pl, mpl, proto, pw); break; @@ -331,7 +558,13 @@ int main (int argc, char *argv[]) { ms_srv[i].s_pw = pw; ms_srv[i].s_mode = gm; ms_srv[i].s_protocol = proto; - ms_srv[i].deathtime = time(NULL) + ms_timeout; + ms_srv[i].deathtime = now + ms_timeout; + ms_srv[i].lasttime = now; + + if (ban_heur(ms_srv + i, now) >= MS_MAXHEUR) { + ban_add(&(event.peer->address), LC_MS_BANHEUR); + break; + } ms_srv[i].used = 1; @@ -344,12 +577,17 @@ int main (int argc, char *argv[]) { free(name); free(map); break; + case NET_MSG_RM: enet_address_get_host_ip(&(event.peer->address), ip, 17); port = b_read_uint16(event.packet->data, &b_read); for (int i = 0; i < MS_MAXSRVS; ++i) { if (ms_srv[i].used) { if ((strncmp(ip, ms_srv[i].s_ip, 16) == 0) && (ms_srv[i].s_port == port)) { + if (ban_heur(ms_srv + i, now) >= MS_MAXHEUR) { + ban_add(&(event.peer->address), LC_MS_BANHEUR); + break; + } ms_srv[i].used = 0; printf(LC_MS_RM, i, ip, port); --ms_count; @@ -357,9 +595,8 @@ int main (int argc, char *argv[]) { } } break; - case NET_MSG_LIST: - if (!event.peer) continue; + case NET_MSG_LIST: b_write = 0; b_write_uint8(b_send, &b_write, NET_MSG_LIST);