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Diffstat (limited to 'src/common/socket.c')
-rw-r--r--src/common/socket.c134
1 files changed, 102 insertions, 32 deletions
diff --git a/src/common/socket.c b/src/common/socket.c
index 290c7a1b3..95d8bf578 100644
--- a/src/common/socket.c
+++ b/src/common/socket.c
@@ -30,6 +30,7 @@
#include "common/memmgr.h"
#include "common/mmo.h"
#include "common/nullpo.h"
+#include "common/packets.h"
#include "common/showmsg.h"
#include "common/strlib.h"
#include "common/timer.h"
@@ -301,10 +302,8 @@ static uint32 send_shortlist_set[(FD_SETSIZE+31)/32];// to know if specific fd's
static int create_session(int fd, RecvFunc func_recv, SendFunc func_send, ParseFunc func_parse);
-#ifndef MINICORE
- static int ip_rules = 1;
- static int connect_check(uint32 ip);
-#endif // MINICORE
+static int ip_rules = 1;
+static int connect_check(uint32 ip);
static const char *error_msg(void)
{
@@ -556,12 +555,10 @@ static int connect_client(int listen_fd)
setsocketopts(fd,NULL);
sockt->set_nonblocking(fd, 1);
-#ifndef MINICORE
if( ip_rules && !connect_check(ntohl(client_address.sin_addr.s_addr)) ) {
sockt->close(fd);
return -1;
}
-#endif // MINICORE
#ifndef SOCKET_EPOLL
// Select Based Event Dispatcher
@@ -584,6 +581,7 @@ static int connect_client(int listen_fd)
create_session(fd, recv_to_fifo, send_from_fifo, default_func_parse);
sockt->session[fd]->client_addr = ntohl(client_address.sin_addr.s_addr);
+ sockt->session[fd]->flag.validate = sockt->validate;
return fd;
}
@@ -653,7 +651,6 @@ static int make_listen_bind(uint32 ip, uint16 port)
create_session(fd, connect_client, null_send, null_parse);
sockt->session[fd]->client_addr = 0; // just listens
sockt->session[fd]->rdata_tick = 0; // disable timeouts on this socket
-
return fd;
}
@@ -814,7 +811,36 @@ static int rfifoskip(int fd, size_t len)
if (s->rdata_size < s->rdata_pos + len) {
ShowError("RFIFOSKIP: skipped past end of read buffer! Adjusting from %"PRIuS" to %"PRIuS" (session #%d)\n", len, RFIFOREST(fd), fd);
+ Assert_report(0);
len = RFIFOREST(fd);
+ } else {
+ const size_t lenRest = RFIFOREST(fd);
+ if (s->flag.validate == 1 && len == lenRest) {
+ if (lenRest >= 2) {
+ const uint32 cmd = (uint32)RFIFOW(fd, 0);
+ if (cmd < MIN_PACKET_DB || cmd > MAX_PACKET_DB) {
+ ShowError("Skip wrong packet id: 0x%04X\n", cmd);
+ Assert_report(0);
+ } else {
+ int packet_len = packets->db[cmd];
+ if (packet_len == -1) {
+ if (lenRest < 4) {
+ ShowError("Skip packet with size smaller than 4\n");
+ Assert_report(0);
+ } else {
+ packet_len = RFIFOW(fd, 2);
+ if (packet_len != lenRest) {
+ ShowError("Skip packet 0x%04X with dynamic size %"PRIuS", but must be size %d\n", cmd, lenRest, packet_len);
+ Assert_report(0);
+ }
+ }
+ } else if (packet_len != lenRest) {
+ ShowError("Skip packet 0x%04X with size %"PRIuS", but must be size %d\n", cmd, lenRest, packet_len);
+ Assert_report(0);
+ }
+ }
+ }
+ }
}
s->rdata_pos = s->rdata_pos + len;
@@ -825,14 +851,12 @@ static int rfifoskip(int fd, size_t len)
}
/// advance the WFIFO cursor (marking 'len' bytes for sending)
-static int wfifoset(int fd, size_t len)
+static int wfifoset(int fd, size_t len, bool validate)
{
- size_t newreserve;
- struct socket_data* s;
-
if (!sockt->session_is_valid(fd))
return 0;
- s = sockt->session[fd];
+
+ struct socket_data* s = sockt->session[fd];
if (s == NULL || s->wdata == NULL)
return 0;
@@ -871,6 +895,10 @@ static int wfifoset(int fd, size_t len)
}
}
+
+ if (validate && s->flag.validate == 1)
+ sockt->validateWfifo(fd, len);
+
s->wdata_size += len;
#ifdef SHOW_SERVER_STATS
socket_data_qo += len;
@@ -881,7 +909,7 @@ static int wfifoset(int fd, size_t len)
// always keep a WFIFO_SIZE reserve in the buffer
// For inter-server connections, let the reserve be 1/4th of the link size.
- newreserve = s->flag.server ? FIFOSIZE_SERVERLINK / 4 : WFIFO_SIZE;
+ size_t newreserve = s->flag.server ? FIFOSIZE_SERVERLINK / 4 : WFIFO_SIZE;
// readjust the buffer to include the chosen reserve
sockt->realloc_writefifo(fd, newreserve);
@@ -893,6 +921,15 @@ static int wfifoset(int fd, size_t len)
return 0;
}
+static void wfifohead(int fd, size_t len)
+{
+ Assert_retv(fd >= 0);
+
+ sockt->session[fd]->last_head_size = (uint32)len;
+ if (sockt->session[fd]->wdata_size + len > sockt->session[fd]->max_wdata)
+ sockt->realloc_writefifo(fd, len);
+}
+
static int do_sockets(int next)
{
#ifndef SOCKET_EPOLL
@@ -1065,9 +1102,6 @@ static int do_sockets(int next)
return 0;
}
-//////////////////////////////
-#ifndef MINICORE
-//////////////////////////////
// IP rules and DDoS protection
struct connect_history {
@@ -1326,11 +1360,6 @@ static bool access_list_add(struct config_setting_t *setting, const char *list_n
return true;
}
-//////////////////////////////
-#endif // MINICORE
-//////////////////////////////
-
-#ifndef MINICORE
/**
* Reads 'socket_configuration/ip_rules' and initializes required variables.
*
@@ -1387,9 +1416,7 @@ static bool socket_config_read_iprules(const char *filename, struct config_t *co
return true;
}
-#endif // ! MINICORE
-#ifndef MINICORE
/**
* Reads 'socket_configuration/ddos' and initializes required variables.
*
@@ -1419,7 +1446,6 @@ static bool socket_config_read_ddos(const char *filename, struct config_t *confi
return true;
}
-#endif // ! MINICORE
/**
* Reads 'socket_configuration' and initializes required variables.
@@ -1464,7 +1490,6 @@ static bool socket_config_read(const char *filename, bool imported)
}
#endif // SOCKET_EPOLL
-#ifndef MINICORE
{
uint32 ui32 = 0;
libconfig->setting_lookup_bool(setting, "debug", &access_debug);
@@ -1477,7 +1502,6 @@ static bool socket_config_read(const char *filename, bool imported)
retval = false;
if (!socket_config_read_ddos(filename, &config, imported))
retval = false;
-#endif // MINICORE
// import should overwrite any previous configuration, so it should be called last
if (libconfig->lookup_string(&config, "import", &import) == CONFIG_TRUE) {
@@ -1496,12 +1520,10 @@ static bool socket_config_read(const char *filename, bool imported)
static void socket_final(void)
{
int i;
-#ifndef MINICORE
if( connect_history )
db_destroy(connect_history);
VECTOR_CLEAR(access_allow);
VECTOR_CLEAR(access_deny);
-#endif // MINICORE
for( i = 1; i < sockt->fd_max; i++ )
if(sockt->session[i])
@@ -1686,10 +1708,8 @@ static void socket_init(void)
}
#endif // defined(HAVE_SETRLIMIT) && !defined(CYGWIN)
-#ifndef MINICORE
VECTOR_INIT(access_allow);
VECTOR_INIT(access_deny);
-#endif // ! MINICORE
// Get initial local ips
sockt->naddr_ = sockt->getips(sockt->addr_,16);
@@ -1729,12 +1749,10 @@ static void socket_init(void)
// should hold enough buffer (it is a vacuum so to speak) as it is never flushed. [Skotlex]
create_session(0, null_recv, null_send, null_parse);
-#ifndef MINICORE
// Delete old connection history every 5 minutes
connect_history = uidb_alloc(DB_OPT_RELEASE_DATA);
timer->add_func_list(connect_check_clear, "connect_check_clear");
timer->add_interval(timer->gettick()+1000, connect_check_clear, 0, 0, 5*60*1000);
-#endif // MINICORE
ShowInfo("Server supports up to '"CL_WHITE"%"PRIu64""CL_RESET"' concurrent connections.\n", rlim_cur);
}
@@ -1818,6 +1836,11 @@ static void socket_datasync(int fd, bool send)
{ sizeof(struct guild_castle) },
{ sizeof(struct fame_list) },
{ PACKETVER },
+ { PACKETVER_MAIN_NUM },
+ { PACKETVER_RE_NUM },
+ { PACKETVER_ZERO_NUM },
+ { PACKETVER_AD_NUM },
+ { PACKETVER_SAK_NUM },
};
unsigned short i;
unsigned int alen = ARRAYLENGTH(data_list);
@@ -2072,6 +2095,50 @@ static void socket_net_config_read(const char *filename)
return;
}
+static void socket_validateWfifo(int fd, size_t len)
+{
+ if (len < 2) {
+ ShowError("Sent packet with size smaller than 2\n");
+ Assert_retv(0);
+ return;
+ }
+ const uint32 cmd = (uint32)WFIFOW(fd, 0);
+ const uint32 last_head_size = sockt->session[fd]->last_head_size;
+ sockt->session[fd]->last_head_size = 0;
+
+ if (cmd < MIN_PACKET_DB || cmd > MAX_PACKET_DB) {
+ ShowError("Sent wrong packet id: 0x%04X\n", cmd);
+ Assert_retv(0);
+ return;
+ }
+ if (len > 65535) {
+ ShowError("Sent packet with size bigger than 65535\n");
+ Assert_retv(0);
+ return;
+ }
+ int packet_len = packets->db[cmd];
+ const int len2 = (int)len;
+ if (packet_len == -1) {
+ if (len2 < 4) {
+ ShowError("Sent packet with size smaller than 4\n");
+ Assert_retv(0);
+ return;
+ }
+ packet_len = WFIFOW(fd, 2);
+ if (packet_len != len2) {
+ ShowError("Sent packet 0x%04X with dynamic size %d, but must be size %d\n", cmd, len2, packet_len);
+ Assert_retv(0);
+ }
+ } else if (packet_len != len2) {
+ ShowError("Sent packet 0x%04X with size %d, but must be size %d\n", cmd, len2, packet_len);
+ Assert_retv(0);
+ }
+ if (last_head_size < (uint32)packet_len) {
+ ShowError("Reserved too small packet buffer for packet 0x%04X with size %u, but must be size %d\n", cmd, last_head_size, packet_len);
+ Assert_retv(0);
+ }
+}
+
void socket_defaults(void)
{
sockt = &sockt_s;
@@ -2083,6 +2150,7 @@ void socket_defaults(void)
/* */
memset(&sockt->addr_, 0, sizeof(sockt->addr_));
sockt->naddr_ = 0;
+ sockt->validate = false;
/* */
VECTOR_INIT(sockt->lan_subnets);
VECTOR_INIT(sockt->allowed_ips);
@@ -2100,6 +2168,7 @@ void socket_defaults(void)
sockt->realloc_fifo = realloc_fifo;
sockt->realloc_writefifo = realloc_writefifo;
sockt->wfifoset = wfifoset;
+ sockt->wfifohead = wfifohead;
sockt->rfifoskip = rfifoskip;
sockt->close = socket_close;
/* */
@@ -2122,4 +2191,5 @@ void socket_defaults(void)
sockt->trusted_ip_check = socket_trusted_ip_check;
sockt->net_config_read_sub = socket_net_config_read_sub;
sockt->net_config_read = socket_net_config_read;
+ sockt->validateWfifo = socket_validateWfifo;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-19 10:40:40 +0000