[PATCH v2 3/8] netlink: print unrecognized attribute data in hex

[JingPiao Chen]

* nlattr.c (decode_nlattr_with_data): Replace printstrn
with printstr_ex and set QUOTE_FORCE_HEX flag.
* tests/print_quoted_string.c (print_quoted_hex): New function.
* tests/test_nlattr.h (print_quoted_hex): New prototype.
* tests/tests.h (TEST_NLATTR_OBJECT, TEST_NLATTR_ARRAY): Use it
for update expected output.
* tests/nlattr.c: Update expected output.
---
 nlattr.c                    |  3 ++-
 tests/nlattr.c              |  3 ++-
 tests/print_quoted_string.c | 11 +++++++++++
 tests/test_nlattr.h         |  4 ++--
 tests/tests.h               |  3 +++
 5 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/nlattr.c b/nlattr.c
index ef3d762..00f8924 100644
--- a/nlattr.c
+++ b/nlattr.c
@@ -86,7 +86,8 @@ decode_nlattr_with_data(struct tcb *const tcp,
 		    || !decoders[nla->nla_type](tcp, addr + NLA_HDRLEN,
 						nla_len - NLA_HDRLEN,
 						opaque_data))
-			printstrn(tcp, addr + NLA_HDRLEN, len - NLA_HDRLEN);
+			printstr_ex(tcp, addr + NLA_HDRLEN,
+				    len - NLA_HDRLEN, QUOTE_FORCE_HEX);
 		tprints("}");
 	}
 }
diff --git a/tests/nlattr.c b/tests/nlattr.c
index 7361ece..ae3ad4d 100644
--- a/tests/nlattr.c
+++ b/tests/nlattr.c
@@ -133,7 +133,8 @@ test_nlattr(const int fd)
 	       ", flags=NLM_F_DUMP, seq=0, pid=0}, {udiag_family=AF_UNIX"
 	       ", udiag_type=SOCK_STREAM, udiag_state=TCP_FIN_WAIT1"
 	       ", udiag_ino=0, udiag_cookie=[0, 0]}, {{nla_len=%u"
-	       ", nla_type=%#x /* UNIX_DIAG_??? */}, \"1234\"}}"
+	       ", nla_type=%#x /* UNIX_DIAG_??? */}"
+	       ", \"\\x31\\x32\\x33\\x34\"}}"
 	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
 	       fd, msg_len, nla->nla_len, UNIX_DIAG_SHUTDOWN + 1,
 	       msg_len, sprintrc(rc));
diff --git a/tests/print_quoted_string.c b/tests/print_quoted_string.c
index ea87d11..9103eed 100644
--- a/tests/print_quoted_string.c
+++ b/tests/print_quoted_string.c
@@ -75,3 +75,14 @@ print_quoted_memory(const char *instr, const size_t len)
 
 	putchar('"');
 }
+
+void
+print_quoted_hex(const char *str, const size_t len)
+{
+	size_t i;
+
+	printf("\"");
+	for (i = 0; i < len; i++)
+		printf("\\x%02x", str[i]);
+	printf("\"");
+}
diff --git a/tests/test_nlattr.h b/tests/test_nlattr.h
index 466c138..24aeb60 100644
--- a/tests/test_nlattr.h
+++ b/tests/test_nlattr.h
@@ -108,7 +108,7 @@ print_nlattr(const unsigned int nla_len, const char *const nla_type)
 			(nla_type_), #nla_type_,			\
 			sizeof(obj_) - 1,				\
 			(pattern_), sizeof(obj_) - 1,			\
-			printf("\"%.*s\"", plen, (pattern_)));		\
+			print_quoted_hex((pattern_), plen));		\
 		/* short read of sizeof(obj_) */			\
 		TEST_NLATTR_((fd_), (nlh0_), (hdrlen_),			\
 			(init_msg_), (print_msg_),			\
@@ -139,7 +139,7 @@ print_nlattr(const unsigned int nla_len, const char *const nla_type)
 			(nla_type_), #nla_type_,			\
 			sizeof((obj_)[0]) - 1,				\
 			(pattern_), sizeof((obj_)[0]) - 1,		\
-			printf("\"%.*s\"", plen, (pattern_)));		\
+			print_quoted_hex((pattern_), plen));		\
 		/* sizeof((obj_)[0]) < len < sizeof(obj_) */		\
 		TEST_NLATTR_((fd_), (nlh0_), (hdrlen_),			\
 			(init_msg_), (print_msg_),			\
diff --git a/tests/tests.h b/tests/tests.h
index 094f365..bc7dc98 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -137,6 +137,9 @@ void print_quoted_string(const char *);
 /* Print memory in a quoted form. */
 void print_quoted_memory(const char *, size_t);
 
+/* Print memory in a hexquoted form. */
+void print_quoted_hex(const char *, size_t);
+
 /* Print time_t and nanoseconds in symbolic format. */
 void print_time_t_nsec(time_t, unsigned long long, int);
 
-- 
2.7.4