From e7bc76da7388db23c33b03bc26c49e61bdcf02ed Mon Sep 17 00:00:00 2001
From: Vladimir Dubrovin <3proxy@3proxy.ru>
Date: Sat, 8 Aug 2026 21:34:15 +0300
Subject: [PATCH] Restore half-close support by default (accidentally switched
 off in previous fixes)

---
 man/3proxy.cfg.5 | 13 ++++++++-----
 src/proxymain.c  |  8 ++++----
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/man/3proxy.cfg.5 b/man/3proxy.cfg.5
index b3572e4..76fa4f7 100644
--- a/man/3proxy.cfg.5
+++ b/man/3proxy.cfg.5
@@ -201,11 +201,14 @@ for most traffic. Rebuild with -DWITHSPLICE to make -s available, -s0 disables i
 explicitly.
 .br
 .B -C
- (for TCP services) keep the session until both sides close the connection
-(TCP half-close). By default a connection closed by any of the sides terminates
-the session, buffered data is delivered before the sockets are closed. Half-close
-is required for the protocols where one of the sides closes its sending side and
-expects the answer, it may cause the sockets to be kept in CLOSE_WAIT state.
+ (for TCP services) a connection closed by any of the sides terminates the
+session, buffered data is delivered before the sockets are closed. By default
+the session is kept until both sides close the connection (TCP half-close).
+Half-close is required for the protocols where one of the sides closes its
+sending side and expects the answer, but it keeps the socket of the side which
+has already closed the connection in CLOSE_WAIT state. Use -C to close both
+sockets as soon as any of the sides closes the connection, -C1 to request
+the default behaviour explicitly.
 .br
  (for dnspr) simple, do not use resolver and 3proxy cache, always use external DNS server.
 .br
diff --git a/src/proxymain.c b/src/proxymain.c
index 00f841d..ec65ca9 100644
--- a/src/proxymain.c
+++ b/src/proxymain.c
@@ -329,8 +329,8 @@ int MODULEMAINFUNC (int argc, char** argv){
 #endif
 #ifdef WITHSPLICE
 	" -s Use splice() - no filtering for data, off by default\n"
-	" -C keep the session until both sides close the connection (TCP half-close),\n"
-	"    by default connection closed by any of the sides terminates the session\n"
+	" -C connection closed by any of the sides terminates the session, by default\n"
+	"    the session is kept until both sides close it (TCP half-close)\n"
 #endif
 	"-g(GRACE_TRAFF,GRACE_NUM,GRACE_DELAY) - delay GRACE_DELAY milliseconds before polling if average polling size below  GRACE_TRAFF bytes and GRACE_NUM read operations in single directions are detected within 1 second to minimize polling\n"
 	" -fFORMAT logging format (see documentation)\n"
@@ -599,7 +599,7 @@ int MODULEMAINFUNC (int argc, char** argv){
 			sscanf(argv[i]+2, "%d,%d,%d", &srv.gracetraf, &srv.gracenum, &srv.gracedelay);
 			break;
 		case 'C':
-			srv.halfclose = *(argv[i]+2)? atoi(argv[i]+2) : 1;
+			srv.halfclose = *(argv[i]+2)? atoi(argv[i]+2) : 0;
 			break;
 		case 's':
 #ifdef WITHSPLICE
@@ -1252,7 +1252,7 @@ void srvinit(struct srvparam * srv, struct clientparam *param){
 #ifdef WITHSPLICE
  srv->usesplice = 0;
 #endif
- srv->halfclose = 0;
+ srv->halfclose = 1;
  memset(param, 0, sizeof(struct clientparam));
  param->srv = srv;
  param->version = srv->version;