1 files changed, 193 insertions, 0 deletions
diff --git a/src/util-daemon.c b/src/util-daemon.c
new file mode 100644
index 0000000..9092189
--- /dev/null
+++ b/src/util-daemon.c
@@ -0,0 +1,193 @@
+/* Copyright (C) 2007-2010 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * 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
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ *
+ * \author Gerardo Iglesias Galvan <iglesiasg@gmail.com>
+ *
+ * Daemonization process
+ */
+
+#include "suricata.h"
+#include "suricata-common.h"
+#include "runmodes.h"
+#include "util-daemon.h"
+#include "util-debug.h"
+#include "conf.h"
+
+#ifndef OS_WIN32
+
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static volatile sig_atomic_t sigflag = 0;
+
+/**
+ * \brief Signal handler used to take the parent process out of stand-by
+ */
+static void SignalHandlerSigusr1 (int signo)
+{
+    sigflag = 1;
+}
+
+/**
+ * \brief Tell the parent process the child is ready
+ *
+ * \param pid pid of the parent process to signal
+ */
+static void TellWaitingParent (pid_t pid)
+{
+    kill(pid, SIGUSR1);
+}
+
+/**
+ * \brief Set the parent on stand-by until the child is ready
+ *
+ * \param pid pid of the child process to wait
+ */
+static void WaitForChild (pid_t pid)
+{
+    int status;
+    SCLogDebug("Daemon: Parent waiting for child to be ready...");
+    /* Wait until child signals is ready */
+    while (sigflag == 0) {
+        if (waitpid(pid, &status, WNOHANG)) {
+            /* Check if the child is still there, otherwise the parent should exit */
+            if (WIFEXITED(status) || WIFSIGNALED(status)) {
+                FatalError("Child died unexpectedly");
+            }
+        }
+        /* sigsuspend(); */
+        sleep(1);
+    }
+}
+
+/**
+ * \brief Close stdin, stdout, stderr.Redirect logging info to syslog
+ *
+ */
+static void SetupLogging (void)
+{
+    /* Redirect stdin, stdout, stderr to /dev/null  */
+    int fd = open("/dev/null", O_RDWR);
+    if (fd < 0)
+        return;
+    (void)dup2(fd, 0);
+    (void)dup2(fd, 1);
+    (void)dup2(fd, 2);
+    close(fd);
+}
+
+/**
+ * \brief Daemonize the process
+ *
+ */
+void Daemonize (void)
+{
+    pid_t pid, sid;
+
+    /* Register the signal handler */
+    signal(SIGUSR1, SignalHandlerSigusr1);
+
+    /** \todo We should check if we allow more than 1 instance
+              to run simultaneously. Maybe change the behaviour
+              through conf file */
+
+    /* Creates a new process */
+#if defined(OS_DARWIN) && defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+#endif
+    pid = fork();
+#if defined(OS_DARWIN) && defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
+    if (pid < 0) {
+        /* Fork error */
+        FatalError("Error forking the process");
+    } else if (pid == 0) {
+        /* Child continues here */
+        const char *daemondir;
+
+        sid = setsid();
+        if (sid < 0) {
+            FatalError("Error creating new session");
+        }
+
+        if (ConfGet("daemon-directory", &daemondir) == 1) {
+            if ((chdir(daemondir)) < 0) {
+                FatalError("Error changing to working directory");
+            }
+        }
+#ifndef OS_WIN32
+        else {
+            if (chdir("/") < 0) {
+                SCLogError("Error changing to working directory '/'");
+            }
+        }
+#endif
+
+        SetupLogging();
+
+        /* Child is ready, tell its parent */
+        TellWaitingParent(getppid());
+
+        /* Daemon is up and running */
+        SCLogDebug("Daemon is running");
+        return;
+    }
+    /* Parent continues here, waiting for child to be ready */
+    SCLogDebug("Parent is waiting for child to be ready");
+    WaitForChild(pid);
+
+    /* Parent exits */
+    SCLogDebug("Child is ready, parent exiting");
+    exit(EXIT_SUCCESS);
+
+}
+
+#endif /* ifndef OS_WIN32 */
+
+/**
+ * \brief Check for a valid combination daemon/mode
+ *
+ * \param daemon daemon on or off
+ * \param mode selected mode
+ *
+ * \retval 1 valid combination
+ * \retval 0 invalid combination
+ */
+int CheckValidDaemonModes (int daemon, int mode)
+{
+    if (daemon) {
+        switch (mode) {
+            case RUNMODE_PCAP_FILE:
+                SCLogError("ERROR: pcap offline mode cannot run as daemon");
+                return 0;
+            case RUNMODE_UNITTEST:
+                SCLogError("ERROR: unittests cannot run as daemon");
+                return 0;
+            default:
+                SCLogDebug("Allowed mode");
+                break;
+        }
+    }
+    return 1;
+}