fuzzing: Add syslog() and srand() wrappers

Change-Id: Ie622946606226171da6244361d334ba023dfa655

test/fuzzing/Makefile.am

@@ -7,5 +7,5 @@ check_PROGRAMS =
 
 lib_LTLIBRARIES = libfuzz.la
 
-libfuzz_la_SOURCES = lib/utils.cpp lib/supervisor.cpp lib/gnutls.cpp
+libfuzz_la_SOURCES = lib/utils.cpp lib/supervisor.cpp lib/gnutls.cpp lib/rand.cpp lib/syslog.cpp
 endif

test/fuzzing/lib/rand.cpp

+/*
+ *  Copyright (C) 2021 Savoir-faire Linux Inc.
+ *
+ *  Author: Olivier Dion <olivier.dion>@savoirfairelinux.com>
+ *
+ *  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 3 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; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ */
+
+#include <stdlib.h>
+
+/*
+ * No random!
+ */
+void
+srand(unsigned int seed)
+{
+    (void) seed;
+}

test/fuzzing/lib/syslog.cpp

+/*
+ *  Copyright (C) 2021 Savoir-faire Linux Inc.
+ *
+ *  Author: Olivier Dion <olivier.dion>@savoirfairelinux.com>
+ *
+ *  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 3 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; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ */
+
+#include <syslog.h>
+#include <stdio.h>
+#include <cstdlib>
+
+#include "lib/supervisor.h"
+#include "lib/syslog.h"
+
+/* Jami */
+#include "logger.h"
+
+__weak
+bool
+syslog_handler(int priority, const char *fmt, va_list ap)
+{
+        (void)priority;
+        (void)fmt;
+        (void)ap;
+
+        fflush(NULL);
+        fprintf(stderr, "libfuzz: stop by supervisor log\n");
+
+        return false;
+}
+
+BEGIN_WRAPPER(void, vsyslog, int priority, const char* format, va_list ap)
+{
+    static int priority_threshold = -2;
+
+    if (-2 == priority_threshold) {
+
+        const char* str_to_int[] = {
+                [LOG_EMERG]   = "EMERG",
+                [LOG_ALERT]   = "ALERT",
+                [LOG_CRIT]    = "CRIT",
+                [LOG_ERR]     = "ERR",
+                [LOG_WARNING] = "WARNING",
+                [LOG_NOTICE]  = "NOTICE",
+                [LOG_INFO]    = "INFO",
+                [LOG_DEBUG]   = "DEBUG"
+        };
+
+        const char* supervisor_says = std::getenv(supervisor::env::log);
+
+        if (nullptr == supervisor_says) {
+            priority_threshold = 0;
+            goto no_threshold;
+        }
+
+        for (size_t i = 0; i < array_size(str_to_int); ++i) {
+            if (streq(str_to_int[i], supervisor_says)) {
+                priority_threshold = i;
+                break;
+            }
+        }
+
+        if (priority_threshold < 0) {
+            fprintf(stderr, "libfuzz: Invalid value of SUPERVISOR_LOG `%s`\n", supervisor_says);
+            priority_threshold = -1;
+        }
+    }
+
+no_threshold:
+    this_func(priority, format, ap);
+
+    if (priority <= priority_threshold) {
+       if (not syslog_handler(priority, format, ap)) {
+            exit(supervisor::signal::exit::log);
+        }
+    }
+}
+END_WRAPPER();

test/fuzzing/lib/syslog.h

+/*
+ *  Copyright (C) 2021 Savoir-faire Linux Inc.
+ *
+ *  Author: Olivier Dion <olivier.dion>@savoirfairelinux.com>
+ *
+ *  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 3 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; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ */
+
+#pragma once
+
+#include <stdarg.h>
+
+extern "C" {
+	extern bool syslog_handler(int priority, const char *fmt, va_list ap);
+};