netdev - [PATCH] ss: replace all zero characters in a unix name to '@'

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Message-Id: <1491010317-27083-1-git-send-email-avagin@openvz.org>
Date:   Sat,  1 Apr 2017 04:31:57 +0300
From:   Andrei Vagin <avagin@...nvz.org>
To:     stephen@...workplumber.org
Cc:     netdev@...r.kernel.org, Andrei Vagin <avagin@...tuozzo.com>
Subject: [PATCH] ss: replace all zero characters in a unix name to '@'

From: Andrei Vagin <avagin@...tuozzo.com>

A name of an abstract socket can contain zero characters.
Now we replace only the first character. If a name contains more
than one zero character, the ss tool shows only a part of the name:
u_str  UNCONN    0    0     @                            1931097   * 0

the output with this patch:
u_str  UNCONN    0    0     @@zdtm-./sk-unix-unconn-23/@ 1931097   * 0

Signed-off-by: Andrei Vagin <avagin@...tuozzo.com>
---
 misc/ss.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/misc/ss.c b/misc/ss.c
index 5cda728..a3200a1 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -2726,10 +2726,24 @@ static int unix_show_sock(const struct sockaddr_nl *addr, struct nlmsghdr *nlh,
 	if (tb[UNIX_DIAG_NAME]) {
 		int len = RTA_PAYLOAD(tb[UNIX_DIAG_NAME]);
 
+		if (len > sizeof(name) - 1)
+			len = sizeof(name) - 1;
+
 		memcpy(name, RTA_DATA(tb[UNIX_DIAG_NAME]), len);
 		name[len] = '\0';
-		if (name[0] == '\0')
+		if (name[0] == '\0') {
+			char *n;
+
 			name[0] = '@';
+
+			n = name + 1;
+			while (n && n < name + len) {
+				n = memchr(n, 0, name + len - n);
+				if (n == NULL)
+					break;
+				*n = '@';
+			}
+		}
 		stat.name = &name[0];
 		memcpy(stat.local.data, &stat.name, sizeof(stat.name));
 	}
-- 
2.7.4