11 #include <enet/enet.h>
12 #include <enet/types.h>
14 #define MS_VERSION "0.3"
15 #define MS_MAX_SERVERS 128
16 #define MS_MAX_CLIENTS (MS_MAX_SERVERS + 1)
17 #define MS_URGENT_FILE "urgent.txt"
18 #define MS_MOTD_FILE "motd.txt"
19 #define MS_BAN_FILE "master_bans.txt"
21 #define DEFAULT_SPAM_CAP 10
22 #define DEFAULT_MAX_SERVERS MS_MAX_SERVERS
23 #define DEFAULT_MAX_PER_HOST 4
24 #define DEFAULT_TIMEOUT 100
25 #define DEFAULT_PORT 25665
27 #define NET_BUFSIZE 65536
28 #define NET_FULLMASK 0xFFFFFFFF
30 #define SV_PROTO_MIN 140
31 #define SV_PROTO_MAX 210
32 #define SV_NAME_MAX 64
34 #define SV_MAX_PLAYERS 24
35 #define SV_MAX_GAMEMODE 5
36 #define SV_NEW_SERVER_INTERVAL 3
38 #define MAX_STRLEN 0xFF
59 SV_FL_PASSWORD
= 1 << 0,
60 SV_FL_VERIFIED
= 1 << 1,
61 SV_FL_MAX
= SV_FL_PASSWORD
| SV_FL_VERIFIED
,
64 typedef struct enet_buf_s
{
71 typedef struct ban_record_s
{
76 struct ban_record_s
*next
;
77 struct ban_record_s
*prev
;
80 typedef struct server_s
{
81 enet_uint32 host
; // BE; 0 means this slot is unused
82 enet_uint16 port
; // LE, which is what the game and enet both expect
87 enet_uint8 maxplayers
;
88 char name
[MAX_STRLEN
+ 2];
89 char map
[MAX_STRLEN
+ 2];
95 static server_t servers
[MS_MAX_SERVERS
];
96 static int max_servers
= DEFAULT_MAX_SERVERS
;
97 static int max_servers_per_host
= DEFAULT_MAX_PER_HOST
;
98 static int num_servers
= 0;
100 // fake servers to show on old versions of the game
101 static const server_t fake_servers
[] = {
103 .name
= "! \xc2\xc0\xd8\xc0 \xca\xce\xcf\xc8\xdf \xc8\xc3\xd0\xdb "
104 "\xd3\xd1\xd2\xc0\xd0\xc5\xcb\xc0! "
105 "\xd1\xca\xc0\xd7\xc0\xc9\xd2\xc5 \xcd\xce\xc2\xd3\xde C "
107 .map
= "! Your game is outdated. "
108 "Get latest version at doom2d.org !",
112 .name
= "! \xcf\xd0\xce\xc1\xd0\xce\xd1\xdcTE \xcf\xce\xd0\xd2\xdb "
113 "25666 \xc8 57133 HA CEPBEPE \xcf\xc5\xd0\xc5\xc4 \xc8\xc3\xd0\xce\xc9 !",
114 .map
= "! Forward ports 25666 and 57133 before hosting !",
118 static const int num_fake_servers
= sizeof(fake_servers
) / sizeof(*fake_servers
);
121 static ban_record_t
*banlist
;
124 static int ms_port
= DEFAULT_PORT
;
125 static int ms_timeout
= DEFAULT_TIMEOUT
;
126 static int ms_spam_cap
= DEFAULT_SPAM_CAP
;
127 static char ms_motd
[MAX_STRLEN
+ 1] = "";
128 static char ms_urgent
[MAX_STRLEN
+ 1] = "";
129 static ENetHost
*ms_host
;
132 static enet_uint8 buf_send_data
[NET_BUFSIZE
];
133 static enet_buf_t buf_send
= { .data
= buf_send_data
, .size
= sizeof(buf_send_data
) };
134 static enet_buf_t buf_recv
; // rx data supplied by enet packets
136 // stupid client spam filter
137 static enet_uint32 cl_last_addr
;
138 static time_t cl_last_time
;
139 static int cl_spam_cnt
;
141 /* common utility functions */
143 static char *u_vabuf(void) {
144 static char vabuf
[4][MAX_STRLEN
];
146 char *ret
= vabuf
[idx
++];
147 if (idx
>= 4) idx
= 0;
151 static const char *u_strtime(const time_t t
) {
152 char *buf
= u_vabuf();
153 struct tm
*ptm
= localtime(&t
);
154 strftime(buf
, MAX_STRLEN
- 1, "%d/%m/%y %H:%M:%S", ptm
);
158 static inline const char *u_logprefix(const enum log_severity_e s
) {
160 case LOG_WARN
: return "WARNING: ";
161 case LOG_ERROR
: return "ERROR: ";
166 static void u_log(const enum log_severity_e severity
, const char *fmt
, ...) {
167 printf("[%s] %s", u_strtime(time(NULL
)), u_logprefix(severity
));
175 static void __attribute__((noreturn
)) u_fatal(const char *fmt
, ...) {
176 fprintf(stderr
, "[%s] FATAL ERROR:\n", u_strtime(time(NULL
)));
179 vfprintf(stderr
, fmt
, args
);
181 fprintf(stderr
, "\n");
186 static bool u_strisprint(const char *str
) {
189 for (const char *p
= str
; *p
; ++p
) {
190 // only stuff before space, DEL, NBSP and SHY are considered garbage since we're on 1251
191 if (*p
< 0x20 || *p
== 0x7F || *p
== 0xA0 || *p
== 0xAD)
197 static bool u_strisver(const char *str
) {
200 for (const char *p
= str
; *p
; ++p
) {
201 // version strings consist of 0-9 . and space
202 if (!isdigit(*p
) && *p
!= '.' && *p
!= ' ')
208 static const char *u_iptostr(const enet_uint32 host
) {
209 ENetAddress addr
= { .host
= host
, .port
= 0 };
210 char *buf
= u_vabuf();
211 enet_address_get_host_ip(&addr
, buf
, MAX_STRLEN
- 1);
215 static bool u_readtextfile(const char *fname
, char *buf
, size_t max
) {
216 FILE *f
= fopen(fname
, "r");
217 char *const end
= buf
+ max
- 1;
221 char *const lend
= ln
+ max
- 1;
222 while (p
< end
&& fgets(ln
, max
, f
)) {
223 for (char *n
= ln
; n
< lend
&& *n
&& *n
!= '\r' && *n
!= '\n'; ++n
) {
235 static inline enet_uint32
u_prefixtomask(const enet_uint32 prefix
) {
236 return ENET_HOST_TO_NET_32((0xFFFFFFFF << (32 - prefix
)) & 0xFFFFFFFF);
239 static inline enet_uint32
u_masktoprefix(const enet_uint32 mask
) {
240 return (32 - __builtin_ctz(mask
));
243 static inline void u_printsv(const server_t
*sv
) {
244 printf("* addr: %s:%d\n", u_iptostr(sv
->host
), sv
->port
);
245 printf("* name: %s\n", sv
->name
);
246 printf("* map: %s (mode %d)\n", sv
->map
, sv
->gamemode
);
247 printf("* plrs: %d/%d\n", sv
->players
, sv
->maxplayers
);
248 printf("* flag: %04x\n", sv
->flags
);
251 /* buffer utility functions */
253 static inline int b_enough_left(enet_buf_t
*buf
, size_t size
) {
254 if (buf
->pos
+ size
> buf
->size
) {
261 static enet_uint8
b_read_uint8(enet_buf_t
*buf
) {
262 if (b_enough_left(buf
, 1))
263 return buf
->data
[buf
->pos
++];
267 static enet_uint16
b_read_uint16(enet_buf_t
*buf
) {
270 if (b_enough_left(buf
, sizeof(ret
))) {
271 ret
= *(enet_uint16
*)(buf
->data
+ buf
->pos
);
272 buf
->pos
+= sizeof(ret
);
278 static char *b_read_dstring(enet_buf_t
*buf
) {
281 if (b_enough_left(buf
, 1)) {
282 const size_t len
= b_read_uint8(buf
);
283 if (b_enough_left(buf
, len
)) {
284 ret
= malloc(len
+ 1);
285 memmove(ret
, (char*)(buf
->data
+ buf
->pos
), len
);
294 static char *b_read_dstring_to(enet_buf_t
*buf
, char *out
, size_t out_size
) {
295 if (b_enough_left(buf
, 1)) {
296 const size_t len
= b_read_uint8(buf
);
297 if (b_enough_left(buf
, len
)) {
298 if (len
< out_size
) {
299 memmove(out
, (char*)(buf
->data
+ buf
->pos
), len
);
301 } else if (out_size
) {
311 static void b_write_uint8(enet_buf_t
*buf
, enet_uint8 val
) {
312 buf
->data
[buf
->pos
++] = val
;
315 static void b_write_uint16(enet_buf_t
*buf
, enet_uint16 val
) {
316 *(enet_uint16
*)(buf
->data
+ buf
->pos
) = val
;
317 buf
->pos
+= sizeof(val
);
320 static void b_write_dstring(enet_buf_t
*buf
, const char* val
) {
321 enet_uint8 len
= strlen(val
);
322 b_write_uint8(buf
, len
);
323 memmove((char*)(buf
->data
+ buf
->pos
), val
, len
);
327 void b_write_server(enet_buf_t
*buf
, const server_t
*s
) {
328 b_write_dstring(buf
, u_iptostr(s
->host
));
329 b_write_uint16 (buf
, s
->port
);
330 b_write_dstring(buf
, s
->name
);
331 b_write_dstring(buf
, s
->map
);
332 b_write_uint8 (buf
, s
->gamemode
);
333 b_write_uint8 (buf
, s
->players
);
334 b_write_uint8 (buf
, s
->maxplayers
);
335 b_write_uint8 (buf
, s
->proto
);
336 b_write_uint8 (buf
, (s
->flags
& SV_FL_PASSWORD
));
339 /* server functions */
341 static void sv_remove(const enet_uint32 host
, const enet_uint16 port
) {
342 for (int i
= 0; i
< max_servers
; ++i
) {
343 if (servers
[i
].host
== host
&& servers
[i
].port
== port
) {
351 static void sv_remove_by_host(enet_uint32 host
, enet_uint32 mask
) {
353 for (int i
= 0; i
< max_servers
; ++i
) {
354 if (servers
[i
].host
&& (servers
[i
].host
& mask
) == host
) {
362 static int sv_count_by_host(enet_uint32 host
, enet_uint32 mask
) {
365 for (int i
= 0; i
< max_servers
; ++i
) {
366 if (servers
[i
].host
&& (servers
[i
].host
& mask
) == host
)
372 static time_t sv_last_timestamp_for_host(enet_uint32 host
, enet_uint32 mask
) {
375 for (int i
= 0; i
< max_servers
; ++i
) {
376 if (servers
[i
].host
&& (servers
[i
].host
& mask
) == host
) {
377 if (servers
[i
].timestamp
> last
)
378 last
= servers
[i
].timestamp
;
384 static inline server_t
*sv_find_or_add(const enet_uint32 host
, const enet_uint32 port
) {
385 server_t
*empty
= NULL
;
386 for (int i
= 0; i
< max_servers
; ++i
) {
387 server_t
*s
= servers
+ i
;
388 if (s
->host
== host
&& s
->port
== port
)
389 return s
; // this server already exists
390 if (!s
->host
&& !empty
)
391 empty
= s
; // remember the first empty slot in case it's needed later
396 /* ban list functions */
398 static inline time_t ban_get_time(const int cnt
) {
399 static const time_t times
[] = {
409 static const size_t numtimes
= sizeof(times
) / sizeof(*times
);
411 if (cnt
>= numtimes
|| cnt
< 0)
412 return times
[numtimes
- 1];
417 static ban_record_t
*ban_check(const enet_uint32 host
) {
418 const time_t now
= time(NULL
);
420 for (ban_record_t
*b
= banlist
; b
; b
= b
->next
) {
421 if ((b
->host
& b
->mask
) == (host
& b
->mask
)) {
422 if (b
->cur_ban
> now
)
430 static inline ban_record_t
*ban_record_check(const enet_uint32 host
) {
431 for (ban_record_t
*b
= banlist
; b
; b
= b
->next
) {
432 if ((b
->host
& b
->mask
) == (host
& b
->mask
))
438 static ban_record_t
*ban_record_add_addr(const enet_uint32 host
, const enet_uint32 mask
, const int cnt
, const time_t cur
) {
439 ban_record_t
*rec
= ban_record_check(host
);
442 rec
= calloc(1, sizeof(*rec
));
443 if (!rec
) return NULL
;
445 rec
->host
= host
& mask
;
447 if (rec
->mask
== 0) rec
->mask
= NET_FULLMASK
;
448 rec
->ban_count
= cnt
;
451 if (banlist
) banlist
->prev
= rec
;
458 static ban_record_t
*ban_record_add_ip(const char *ip
, const int cnt
, const time_t cur
) {
459 enet_uint32 prefix
= 32;
461 // find and get the prefix length, if any
462 char ip_copy
[24] = { 0 };
463 strncpy(ip_copy
, ip
, sizeof(ip_copy
) - 1);
464 char *slash
= strrchr(ip_copy
, '/');
466 *slash
++ = '\0'; // strip the prefix length off
467 if (*slash
) prefix
= atoi(slash
);
470 ENetAddress addr
= { 0 };
471 if (enet_address_set_host_ip(&addr
, ip_copy
) != 0) {
472 u_log(LOG_ERROR
, "banlist: `%s` is not a valid IP address", ip_copy
);
476 // transform prefix length into mask
477 const enet_uint32 mask
= u_prefixtomask(prefix
);
479 return ban_record_add_addr(addr
.host
, mask
, cnt
, cur
);
482 static void ban_free_list(void) {
483 ban_record_t
*rec
= banlist
;
485 ban_record_t
*next
= rec
->next
;
492 static void ban_load_list(const char *fname
) {
493 FILE *f
= fopen(fname
, "r");
495 u_log(LOG_WARN
, "banlist: could not open %s for reading", fname
);
499 char ln
[MAX_STRLEN
] = { 0 };
501 while (fgets(ln
, sizeof(ln
), f
)) {
502 for (int i
= sizeof(ln
) - 1; i
>= 0; --i
)
503 if (ln
[i
] == '\n' || ln
[i
] == '\r')
509 char ip
[21] = { 0 }; // optionally includes the "/nn" prefix length at the end
512 if (sscanf(ln
, "%20s %ld %d", ip
, &exp
, &count
) < 3) {
513 u_log(LOG_ERROR
, "banlist: malformed line: `%s`", ln
);
517 if (ban_record_add_ip(ip
, count
, exp
))
518 u_log(LOG_NOTE
, "banlist: banned %s until %s (ban level %d)", ip
, u_strtime(exp
), count
);
524 static void ban_save_list(const char *fname
) {
525 FILE *f
= fopen(fname
, "w");
527 u_log(LOG_ERROR
, "banlist: could not open %s for writing", fname
);
531 for (ban_record_t
*rec
= banlist
; rec
; rec
= rec
->next
) {
533 fprintf(f
, "%s/%u %ld %d\n", u_iptostr(rec
->host
), u_masktoprefix(rec
->mask
), rec
->cur_ban
, rec
->ban_count
);
539 static bool ban_sanity_check(const server_t
*srv
) {
540 // can't have more than 24 maxplayers; can't have more than max
541 if (srv
->players
> srv
->maxplayers
|| srv
->maxplayers
> SV_MAX_PLAYERS
|| srv
->maxplayers
== 0)
543 // name and map have to be non-garbage
544 if (!u_strisprint(srv
->map
) || !u_strisprint(srv
->name
))
546 // these protocols don't exist
547 if (srv
->proto
< SV_PROTO_MIN
|| srv
->proto
> SV_PROTO_MAX
)
549 // the game doesn't allow server names longer than 64 chars
550 if (strlen(srv
->name
) > SV_NAME_MAX
)
552 // game mode has to actually exist
553 if (srv
->gamemode
> SV_MAX_GAMEMODE
)
555 // flags field can't be higher than the sum of all the flags
556 if (srv
->flags
> SV_FL_MAX
)
561 static void ban_add(const enet_uint32 host
, const char *reason
) {
562 const time_t now
= time(NULL
);
564 ban_record_t
*rec
= ban_record_add_addr(host
, NET_FULLMASK
, 0, 0);
565 if (!rec
) u_fatal("OOM trying to ban %s", u_iptostr(host
));
567 rec
->cur_ban
= now
+ ban_get_time(rec
->ban_count
);
570 u_log(LOG_NOTE
, "banned %s until %s, reason: %s, ban level: %d", u_iptostr(rec
->host
), u_strtime(rec
->cur_ban
), reason
, rec
->ban_count
);
572 ban_save_list(MS_BAN_FILE
);
574 sv_remove_by_host(host
, NET_FULLMASK
);
576 if (host
== cl_last_addr
)
580 static inline void ban_peer(ENetPeer
*peer
, const char *reason
) {
582 ban_add(peer
->address
.host
, reason
);
583 enet_peer_reset(peer
);
589 static void deinit(void) {
590 // ban_save_list(MS_BAN_FILE);
593 enet_host_destroy(ms_host
);
600 static void sigusr_handler(int signum
) {
601 if (signum
== SIGUSR1
) {
602 u_log(LOG_WARN
, "received SIGUSR1, reloading banlist");
604 ban_load_list(MS_BAN_FILE
);
609 static bool handle_msg(const enet_uint8 msgid
, ENetPeer
*peer
) {
611 server_t tmpsv
= { 0 };
612 char clientver
[MAX_STRLEN
] = { 0 };
613 const time_t now
= time(NULL
);
617 tmpsv
.port
= b_read_uint16(&buf_recv
);
618 b_read_dstring_to(&buf_recv
, tmpsv
.name
, sizeof(tmpsv
.name
));
619 b_read_dstring_to(&buf_recv
, tmpsv
.map
, sizeof(tmpsv
.map
));
620 tmpsv
.gamemode
= b_read_uint8(&buf_recv
);
621 tmpsv
.players
= b_read_uint8(&buf_recv
);
622 tmpsv
.maxplayers
= b_read_uint8(&buf_recv
);
623 tmpsv
.proto
= b_read_uint8(&buf_recv
);
624 tmpsv
.flags
= b_read_uint8(&buf_recv
);
626 if (buf_recv
.overflow
) {
627 ban_peer(peer
, "malformed MSG_ADD");
631 sv
= sv_find_or_add(peer
->address
.host
, tmpsv
.port
);
633 u_log(LOG_ERROR
, "ran out of server slots trying to add %s:%d", u_iptostr(peer
->address
.host
), tmpsv
.port
);
637 if (sv
->host
== peer
->address
.host
) {
638 // old server; update it
639 memcpy(sv
->map
, tmpsv
.map
, sizeof(sv
->map
));
640 memcpy(sv
->name
, tmpsv
.name
, sizeof(sv
->name
));
641 sv
->players
= tmpsv
.players
;
642 sv
->maxplayers
= tmpsv
.maxplayers
;
643 sv
->flags
= tmpsv
.flags
;
644 sv
->gamemode
= tmpsv
.gamemode
;
645 // first check if the new values are garbage
646 if (!ban_sanity_check(sv
)) {
647 ban_peer(peer
, "tripped sanity check");
650 // only then update the times
651 sv
->death_time
= now
+ ms_timeout
;
653 u_log(LOG_NOTE
, "updated server #%d:", sv
- servers
);
656 // new server; first check if this host is creating too many servers in the list
657 if (max_servers_per_host
) {
658 const int count
= sv_count_by_host(peer
->address
.host
, NET_FULLMASK
);
659 if (count
>= max_servers_per_host
) {
660 ban_peer(peer
, "too many servers in list");
664 // FIXME: commented out as this might trip when the master restarts
666 // check if this is too soon to create a new server
667 const time_t delta = now - sv_last_timestamp_for_host(peer->address.host, NET_FULLMASK);
668 if (delta < count * SV_NEW_SERVER_INTERVAL) {
669 ban_peer(peer, "creating servers too fast");
675 // then add that shit
677 sv
->host
= peer
->address
.host
;
678 sv
->death_time
= now
+ ms_timeout
;
680 if (!ban_sanity_check(sv
)) {
683 ban_peer(peer
, "tripped sanity check");
687 u_log(LOG_NOTE
, "added new server #%d:", sv
- servers
);
693 tmpsv
.port
= b_read_uint16(&buf_recv
);
694 if (buf_recv
.overflow
) {
695 ban_peer(peer
, "malformed MSG_RM");
698 sv_remove(peer
->address
.host
, tmpsv
.port
);
703 buf_send
.overflow
= 0;
704 b_write_uint8(&buf_send
, NET_MSG_LIST
);
707 if (buf_recv
.size
> 2) {
708 // holy shit a fresh client
709 b_read_dstring_to(&buf_recv
, clientver
, sizeof(clientver
));
710 b_write_uint8(&buf_send
, num_servers
);
712 // old client; feed him fake servers first
713 b_write_uint8(&buf_send
, num_servers
+ num_fake_servers
);
714 for (int i
= 0; i
< num_fake_servers
; ++i
)
715 b_write_server(&buf_send
, &fake_servers
[i
]);
718 if (buf_recv
.overflow
) {
719 ban_peer(peer
, "malformed MSG_LIST");
723 if (clientver
[0] && !u_strisver(clientver
)) {
724 ban_peer(peer
, "malformed MSG_LIST clientver");
728 for (int i
= 0; i
< max_servers
; ++i
) {
730 b_write_server(&buf_send
, servers
+ i
);
734 // TODO: check if this client is outdated (?) and send back new verstring
735 // for now just write the same shit back
736 b_write_dstring(&buf_send
, clientver
);
737 // write the motd and urgent message
738 b_write_dstring(&buf_send
, ms_motd
);
739 b_write_dstring(&buf_send
, ms_urgent
);
742 ENetPacket
*p
= enet_packet_create(buf_send
.data
, buf_send
.pos
, ENET_PACKET_FLAG_RELIABLE
);
743 enet_peer_send(peer
, NET_CH_MAIN
, p
);
744 enet_host_flush(ms_host
);
746 u_log(LOG_NOTE
, "sent server list to %s:%d (ver %s)", u_iptostr(peer
->address
.host
), peer
->address
.port
, clientver
[0] ? clientver
: "<old>");
756 static void print_usage(void) {
757 printf("Usage: d2df_master [OPTIONS...]\n");
758 printf("Available options:\n");
759 printf("-h show this message and exit\n");
760 printf("-p N listen on port N (default: %d)\n", DEFAULT_PORT
);
761 printf("-t N seconds before server is removed from list (default: %d)\n", DEFAULT_TIMEOUT
);
762 printf("-s N max number of servers in server list, 1-%d (default: %d)\n", MS_MAX_SERVERS
, DEFAULT_MAX_SERVERS
);
763 printf("-d N if N > 0, disallow more than N servers on the same IP (default: %d)\n", DEFAULT_MAX_PER_HOST
);
764 printf("-f N crappy spam filter: ban people after they send N requests in a row too fast (default: %d)\n", DEFAULT_SPAM_CAP
);
768 static inline bool parse_int_arg(int argc
, char **argv
, const int i
, const char *name
, int vmin
, int vmax
, int *outval
) {
769 if (strcmp(name
, argv
[i
]))
773 fprintf(stderr
, "expected integer value after %s\n", name
);
777 const int v
= atoi(argv
[i
+ 1]);
778 if (v
< vmin
|| v
> vmax
) {
779 fprintf(stderr
, "expected integer value in range %d - %d\n", vmin
, vmax
);
787 static bool parse_args(int argc
, char **argv
) {
791 if (!strcmp(argv
[1], "-h")) {
796 for (int i
= 1; i
< argc
; ++i
) {
798 parse_int_arg(argc
, argv
, i
, "-p", 1, 0xFFFF, &ms_port
)
799 || parse_int_arg(argc
, argv
, i
, "-t", 1, 0x7FFFFFFF, &ms_timeout
)
800 || parse_int_arg(argc
, argv
, i
, "-s", 1, MS_MAX_SERVERS
, &max_servers
)
801 || parse_int_arg(argc
, argv
, i
, "-d", 0, MS_MAX_SERVERS
, &max_servers_per_host
)
802 || parse_int_arg(argc
, argv
, i
, "-f", 0, 0xFFFF, &ms_spam_cap
);
806 fprintf(stderr
, "unknown or invalid argument: %s\n", argv
[i
]);
814 // a stupid thing to filter sustained spam from a single IP
815 static bool spam_filter(ENetPeer
*peer
) {
816 const time_t now
= time(NULL
);
817 if (peer
->address
.host
== cl_last_addr
) {
818 // spam === sending shit faster than once a second
819 if (now
- cl_last_time
< 1) {
821 u_log(LOG_WARN
, "address %s is sending packets too fast", u_iptostr(peer
->address
.host
));
822 if (++cl_spam_cnt
>= ms_spam_cap
) {
823 ban_peer(peer
, "spam");
831 cl_last_addr
= peer
->address
.host
;
838 int main(int argc
, char **argv
) {
839 if (enet_initialize() != 0)
840 u_fatal("could not init enet");
842 if (!parse_args(argc
, argv
))
843 return 1; // early exit
845 u_log(LOG_NOTE
, "d2df master server starting on port %d", ms_port
);
847 if (!u_readtextfile(MS_MOTD_FILE
, ms_motd
, sizeof(ms_motd
)))
848 u_log(LOG_NOTE
, "couldn't read motd from %s", MS_MOTD_FILE
);
850 u_log(LOG_NOTE
, "motd: %s", ms_motd
);
852 if (!u_readtextfile(MS_URGENT_FILE
, ms_urgent
, sizeof(ms_urgent
)))
853 u_log(LOG_NOTE
, "couldn't read urgentmsg from %s", MS_URGENT_FILE
);
855 u_log(LOG_NOTE
, "urgentmsg: %s", ms_urgent
);
857 ban_load_list(MS_BAN_FILE
);
862 signal(SIGUSR1
, sigusr_handler
);
868 ms_host
= enet_host_create(&addr
, MS_MAX_CLIENTS
, NET_CH_COUNT
, 0, 0);
870 u_fatal("could not create enet host on port %d", ms_port
);
873 enet_uint8 msgid
= 0;
876 while (enet_host_service(ms_host
, &event
, 1000) > 0) {
877 bool filtered
= !event
.peer
|| ban_check(event
.peer
->address
.host
);
878 if (!filtered
&& ms_spam_cap
) filtered
= spam_filter(event
.peer
);
881 switch (event
.type
) {
882 case ENET_EVENT_TYPE_CONNECT
:
883 u_log(LOG_NOTE
, "%s:%d connected", u_iptostr(event
.peer
->address
.host
), event
.peer
->address
.port
);
886 case ENET_EVENT_TYPE_RECEIVE
:
887 if (!event
.packet
|| event
.packet
->dataLength
== 0) {
888 ban_peer(event
.peer
, "empty packet");
891 // set up receive buffer
893 buf_recv
.overflow
= 0;
894 buf_recv
.data
= event
.packet
->data
;
895 buf_recv
.size
= event
.packet
->dataLength
;
896 // read message id and handle the message
897 msgid
= b_read_uint8(&buf_recv
);
898 if (!handle_msg(msgid
, event
.peer
)) {
899 // cheeky cunt sending invalid messages
900 ban_peer(event
.peer
, "unknown message");
907 } else if (event
.peer
) {
908 enet_peer_reset(event
.peer
);
912 buf_recv
.data
= NULL
;
913 enet_packet_destroy(event
.packet
);
917 const time_t now
= time(NULL
);
918 for (int i
= 0; i
< max_servers
; ++i
) {
919 if (servers
[i
].host
) {
920 if (servers
[i
].death_time
<= now
) {
921 u_log(LOG_NOTE
, "server #%d %s:%d timed out", i
, u_iptostr(servers
[i
].host
), servers
[i
].port
);