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

[Andrei Vagin]

From: Andrei Vagin <ava...@virtuozzo.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 <ava...@virtuozzo.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