Merge pull request #1873 from qlyoung/fix-zlog-hexdump

Fix zlog_hexdump

lib/log.c

@@ -1092,41 +1092,52 @@ void zlog_hexdump(const void *mem, unsigned int len)
 	unsigned long i = 0;
 	unsigned int j = 0;
 	unsigned int columns = 8;
-	char buf[(len * 4) + ((len / 4) * 20) + 30];
+	/*
+	 * 19 bytes for 0xADDRESS:
+	 * 24 bytes for data; 2 chars plus a space per data byte
+	 *  1 byte for space
+	 *  8 bytes for ASCII representation
+	 *  1 byte for a newline
+	 * =====================
+	 * 53 bytes per 8 bytes of data
+	 *  1 byte for null term
+	 */
+	size_t bs = ((len / 8) + 1) * 53 + 1;
+	char buf[bs];
 	char *s = buf;
 
+	memset(buf, 0, sizeof(buf));
+
 	for (i = 0; i < len + ((len % columns) ? (columns - len % columns) : 0);
 	     i++) {
 		/* print offset */
 		if (i % columns == 0)
-			s += sprintf(s, "0x%016lx: ", (unsigned long)mem + i);
+			s += snprintf(s, bs - (s - buf),
+				      "0x%016lx: ", (unsigned long)mem + i);
 
 		/* print hex data */
 		if (i < len)
-			s += sprintf(s, "%02x ", 0xFF & ((const char *)mem)[i]);
+			s += snprintf(s, bs - (s - buf), "%02x ",
+				      0xFF & ((const char *)mem)[i]);
 
 		/* end of block, just aligning for ASCII dump */
 		else
-			s += sprintf(s, "   ");
+			s += snprintf(s, bs - (s - buf), "   ");
 
 		/* print ASCII dump */
 		if (i % columns == (columns - 1)) {
 			for (j = i - (columns - 1); j <= i; j++) {
-				if (j >= len) /* end of block, not really
-						 printing */
-					s += sprintf(s, " ");
-
-				else if (isprint((int)((const char *)mem)
-							 [j])) /* printable char
-								  */
-					s += sprintf(
-						s, "%c",
+				/* end of block not really printing */
+				if (j >= len)
+					s += snprintf(s, bs - (s - buf), " ");
+				else if (isprint((int)((const char *)mem)[j]))
+					s += snprintf(
+						s, bs - (s - buf), "%c",
 						0xFF & ((const char *)mem)[j]);
-
 				else /* other char */
-					s += sprintf(s, ".");
+					s += snprintf(s, bs - (s - buf), ".");
 			}
-			s += sprintf(s, "\n");
+			s += snprintf(s, bs - (s - buf), "\n");
 		}
 	}
 	zlog_debug("\n%s", buf);

tests/Makefile.am

@@ -73,6 +73,7 @@ check_PROGRAMS = \
 	lib/test_timer_correctness \
 	lib/test_timer_performance \
 	lib/test_ttable \
+	lib/test_zlog \
 	lib/cli/test_cli \
 	lib/cli/test_commands \
 	$(TESTS_BGPD) \
@@ -115,9 +116,9 @@ lib_test_heavy_SOURCES = lib/test_heavy.c helpers/c/main.c
 lib_test_memory_SOURCES = lib/test_memory.c
 lib_test_nexthop_iter_SOURCES = lib/test_nexthop_iter.c helpers/c/prng.c
 lib_test_privs_SOURCES = lib/test_privs.c
+lib_test_ringbuf_SOURCES = lib/test_ringbuf.c
 lib_test_srcdest_table_SOURCES = lib/test_srcdest_table.c \
                                  helpers/c/prng.c
-lib_test_ringbuf_SOURCES = lib/test_ringbuf.c
 lib_test_segv_SOURCES = lib/test_segv.c
 lib_test_sig_SOURCES = lib/test_sig.c
 lib_test_stream_SOURCES = lib/test_stream.c
@@ -127,6 +128,7 @@ lib_test_timer_correctness_SOURCES = lib/test_timer_correctness.c \
 lib_test_timer_performance_SOURCES = lib/test_timer_performance.c \
                                      helpers/c/prng.c
 lib_test_ttable_SOURCES = lib/test_ttable.c
+lib_test_zlog_SOURCES = lib/test_zlog.c
 lib_test_zmq_SOURCES = lib/test_zmq.c
 lib_test_zmq_CFLAGS = $(AM_CFLAGS) $(ZEROMQ_CFLAGS)
 lib_cli_test_cli_SOURCES = lib/cli/test_cli.c lib/cli/common_cli.c
@@ -167,6 +169,7 @@ lib_test_table_LDADD = $(ALL_TESTS_LDADD) -lm
 lib_test_timer_correctness_LDADD = $(ALL_TESTS_LDADD)
 lib_test_timer_performance_LDADD = $(ALL_TESTS_LDADD)
 lib_test_ttable_LDADD = $(ALL_TESTS_LDADD)
+lib_test_zlog_LDADD = $(ALL_TESTS_LDADD)
 lib_test_zmq_LDADD = ../lib/libfrrzmq.la $(ALL_TESTS_LDADD) $(ZEROMQ_LIBS)
 lib_cli_test_cli_LDADD = $(ALL_TESTS_LDADD)
 lib_cli_test_commands_LDADD = $(ALL_TESTS_LDADD)
@@ -207,6 +210,7 @@ EXTRA_DIST = \
     lib/test_timer_correctness.py \
     lib/test_ttable.py \
     lib/test_ttable.refout \
+    lib/test_zlog.py \
     ospf6d/test_lsdb.py \
     ospf6d/test_lsdb.in \
     ospf6d/test_lsdb.refout \

tests/lib/test_zlog.c

@@ -0,0 +1,61 @@
+/*
+ * Zlog tests.
+ * Copyright (C) 2018  Cumulus Networks, Inc.
+ *                     Quentin Young
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <zebra.h>
+#include <memory.h>
+#include "log.h"
+
+/* maximum amount of data to hexdump */
+#define MAXDATA 16384
+
+/*
+ * Test hexdump functionality.
+ *
+ * At the moment, not crashing is considered success.
+ */
+static bool test_zlog_hexdump(void)
+{
+	unsigned int nl = 1;
+
+	do {
+		long d[nl];
+
+		for (unsigned int i = 0; i < nl; i++)
+			d[i] = random();
+		zlog_hexdump(d, nl * sizeof(long));
+	} while (++nl * sizeof(long) <= MAXDATA);
+
+	return true;
+}
+
+bool (*tests[])(void) = {
+	test_zlog_hexdump,
+};
+
+int main(int argc, char **argv)
+{
+	openzlog("testzlog", "NONE", 0, LOG_CONS | LOG_NDELAY | LOG_PID,
+		 LOG_ERR);
+	zlog_set_file("test_zlog.log", LOG_DEBUG);
+
+	for (unsigned int i = 0; i < array_size(tests); i++)
+		if (!tests[i]())
+			return 1;
+	return 0;
+}

tests/lib/test_zlog.py

@@ -0,0 +1,4 @@
+import frrtest
+
+class TestZlog(frrtest.TestMultiOut):
+    program = './test_zlog'