[Tarantool-patches] [PATCH 13/15] sio: increase SERVICE_NAME_MAXLEN size

[Vladislav Shpilevoy via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

It was 32, and couldn't fit long IPv6 and Unix socket addresses.

The patch makes it 200 so now it fits any supported addresses
family used in the code.

Having SERVICE_NAME_MAXLEN valid is necessary to be able to save
a complete address string on the stack in the places where the
static buffer returned by sio_strfaddr() can't be used safely. For
instance, in the code working with Lua due to Lua GC which might
be invoked any moment and in a __gc handler could overwrite the
static buffer.

Needed for #5632

(cherry picked from commit 6b331f7a78aa409ad68ffc8ceb3deb3733a32473)
---
 src/sio.cc |  2 +-
 src/sio.h  | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/sio.cc b/src/sio.cc
index 0ba19346c..a425b8383 100644
--- a/src/sio.cc
+++ b/src/sio.cc
@@ -81,7 +81,7 @@ sio_socketname(int fd)
 {
 	/* Preserve errno */
 	int save_errno = errno;
-	static __thread char name[2 * SERVICE_NAME_MAXLEN];
+	static __thread char name[SERVICE_NAME_MAXLEN];
 	int rc = sio_socketname_to_buffer(fd, name, sizeof(name));
 	/*
 	 * Could fail only because of a bad format in snprintf, but it is not
diff --git a/src/sio.h b/src/sio.h
index f728af547..3b91f7eee 100644
--- a/src/sio.h
+++ b/src/sio.h
@@ -46,7 +46,16 @@
 extern "C" {
 #endif /* defined(__cplusplus) */
 
-enum { SERVICE_NAME_MAXLEN = 32 };
+enum {
+	/**
+	 * - Unix socket path is 108 bytes max;
+	 * - IP(v4, v6) max string len is 45;
+	 *
+	 * Max result is rounded up just in case the numbers are a bit different
+	 * on various platforms.
+	 */
+	SERVICE_NAME_MAXLEN = 200,
+};
 
 const char *
 sio_strfaddr(struct sockaddr *addr, socklen_t addrlen);
-- 
2.24.3 (Apple Git-128)