Replacing the original charon with a small wrapper around libcharon.
authorTobias Brunner <tobias@strongswan.org>
Fri, 12 Mar 2010 16:12:05 +0000 (17:12 +0100)
committerTobias Brunner <tobias@strongswan.org>
Fri, 19 Mar 2010 12:34:52 +0000 (13:34 +0100)
src/charon/Makefile.am [new file with mode: 0644]
src/charon/charon.c [new file with mode: 0644]

diff --git a/src/charon/Makefile.am b/src/charon/Makefile.am
new file mode 100644 (file)
index 0000000..b3f3954
--- /dev/null
@@ -0,0 +1,13 @@
+ipsec_PROGRAMS = charon
+
+charon_SOURCES = \
+charon.c
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libcharon
+AM_CFLAGS = \
+       -DIPSEC_DIR=\"${ipsecdir}\" \
+       -DIPSEC_PIDDIR=\"${piddir}\"
+charon_LDADD = $(top_builddir)/src/libcharon/libcharon.la -lm $(PTHREAD) $(DLLIB)
+
+#EXTRA_DIST = Android.mk
+
diff --git a/src/charon/charon.c b/src/charon/charon.c
new file mode 100644 (file)
index 0000000..811c504
--- /dev/null
@@ -0,0 +1,414 @@
+/*
+ * Copyright (C) 2006-2010 Tobias Brunner
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#ifdef HAVE_PRCTL
+#include <sys/prctl.h>
+#endif
+#define _POSIX_PTHREAD_SEMANTICS /* for two param sigwait on OpenSolaris */
+#include <signal.h>
+#undef _POSIX_PTHREAD_SEMANTICS
+#include <pthread.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <pwd.h>
+#include <grp.h>
+
+#include <daemon.h>
+
+#include <library.h>
+#include <utils/backtrace.h>
+#include <threading/thread.h>
+
+/**
+ * PID file, in which charon stores its process id
+ */
+#define PID_FILE IPSEC_PIDDIR "/charon.pid"
+
+/**
+ * hook in library for debugging messages
+ */
+extern void (*dbg) (int level, char *fmt, ...);
+
+/**
+ * Logging hook for library logs, using stderr output
+ */
+static void dbg_stderr(int level, char *fmt, ...)
+{
+       va_list args;
+
+       if (level <= 1)
+       {
+               va_start(args, fmt);
+               fprintf(stderr, "00[LIB] ");
+               vfprintf(stderr, fmt, args);
+               fprintf(stderr, "\n");
+               va_end(args);
+       }
+}
+
+/**
+ * Run the daemon and handle unix signals
+ */
+static void run()
+{
+       sigset_t set;
+
+       /* handle SIGINT, SIGHUP ans SIGTERM in this handler */
+       sigemptyset(&set);
+       sigaddset(&set, SIGINT);
+       sigaddset(&set, SIGHUP);
+       sigaddset(&set, SIGTERM);
+       sigprocmask(SIG_BLOCK, &set, NULL);
+
+       while (TRUE)
+       {
+               int sig;
+               int error;
+
+               error = sigwait(&set, &sig);
+               if (error)
+               {
+                       DBG1(DBG_DMN, "error %d while waiting for a signal", error);
+                       return;
+               }
+               switch (sig)
+               {
+                       case SIGHUP:
+                       {
+                               DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
+                               break;
+                       }
+                       case SIGINT:
+                       {
+                               DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
+                               charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
+                               return;
+                       }
+                       case SIGTERM:
+                       {
+                               DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
+                               charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
+                               return;
+                       }
+                       default:
+                       {
+                               DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
+                               break;
+                       }
+               }
+       }
+}
+
+/**
+ * drop daemon capabilities
+ */
+static bool drop_capabilities()
+{
+#ifdef HAVE_PRCTL
+       prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
+#endif
+
+       if (setgid(charon->gid) != 0)
+       {
+               DBG1(DBG_DMN, "change to unprivileged group failed");
+               return FALSE;
+       }
+       if (setuid(charon->uid) != 0)
+       {
+               DBG1(DBG_DMN, "change to unprivileged user failed");
+               return FALSE;
+       }
+       if (!charon->drop_capabilities(charon))
+       {
+               DBG1(DBG_DMN, "unable to drop daemon capabilities");
+               return FALSE;
+       }
+       return TRUE;
+}
+
+/**
+ * lookup UID and GID
+ */
+static bool lookup_uid_gid()
+{
+#ifdef IPSEC_USER
+       {
+               char buf[1024];
+               struct passwd passwd, *pwp;
+
+               if (getpwnam_r(IPSEC_USER, &passwd, buf, sizeof(buf), &pwp) != 0 ||
+                       pwp == NULL)
+               {
+                       DBG1(DBG_DMN, "resolving user '"IPSEC_USER"' failed");
+                       return FALSE;
+               }
+               charon->uid = pwp->pw_uid;
+       }
+#endif
+#ifdef IPSEC_GROUP
+       {
+               char buf[1024];
+               struct group group, *grp;
+
+               if (getgrnam_r(IPSEC_GROUP, &group, buf, sizeof(buf), &grp) != 0 ||
+                       grp == NULL)
+               {
+                       DBG1(DBG_DMN, "resolving group '"IPSEC_GROUP"' failed");
+                       return FALSE;
+               }
+               charon->gid = grp->gr_gid;
+       }
+#endif
+       return TRUE;
+}
+
+/**
+ * Handle SIGSEGV/SIGILL signals raised by threads
+ */
+static void segv_handler(int signal)
+{
+       backtrace_t *backtrace;
+
+       DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
+       backtrace = backtrace_create(2);
+       backtrace->log(backtrace, stderr);
+       backtrace->destroy(backtrace);
+
+       DBG1(DBG_DMN, "killing ourself, received critical signal");
+       abort();
+}
+
+/**
+ * Check/create PID file, return TRUE if already running
+ */
+static bool check_pidfile()
+{
+       struct stat stb;
+       FILE *file;
+
+       if (stat(PID_FILE, &stb) == 0)
+       {
+               file = fopen(PID_FILE, "r");
+               if (file)
+               {
+                       char buf[64];
+                       pid_t pid = 0;
+
+                       memset(buf, 0, sizeof(buf));
+                       if (fread(buf, 1, sizeof(buf), file))
+                       {
+                               pid = atoi(buf);
+                       }
+                       fclose(file);
+                       if (pid && kill(pid, 0) == 0)
+                       {       /* such a process is running */
+                               return TRUE;
+                       }
+               }
+               DBG1(DBG_DMN, "removing pidfile '"PID_FILE"', process not running");
+               unlink(PID_FILE);
+       }
+
+       /* create new pidfile */
+       file = fopen(PID_FILE, "w");
+       if (file)
+       {
+               fprintf(file, "%d\n", getpid());
+               ignore_result(fchown(fileno(file), charon->uid, charon->gid));
+               fclose(file);
+       }
+       return FALSE;
+}
+
+/**
+ * print command line usage and exit
+ */
+static void usage(const char *msg)
+{
+       if (msg != NULL && *msg != '\0')
+       {
+               fprintf(stderr, "%s\n", msg);
+       }
+       fprintf(stderr, "Usage: charon\n"
+                                       "         [--help]\n"
+                                       "         [--version]\n"
+                                       "         [--use-syslog]\n"
+                                       "         [--debug-<type> <level>]\n"
+                                       "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
+                                       "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
+                                       "                                    2 = controlmore, 3 = raw, 4 = private)\n"
+                                       "\n"
+                  );
+       exit(msg == NULL? 0 : 1);
+}
+
+/**
+ * Main function, starts the daemon.
+ */
+int main(int argc, char *argv[])
+{
+       struct sigaction action;
+       bool use_syslog = FALSE;
+       level_t levels[DBG_MAX];
+       int group;
+
+       /* logging for library during initialization, as we have no bus yet */
+       dbg = dbg_stderr;
+
+       /* initialize library */
+       if (!library_init(NULL))
+       {
+               library_deinit();
+               exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
+       }
+
+       if (lib->integrity &&
+               !lib->integrity->check_file(lib->integrity, "charon", argv[0]))
+       {
+               dbg_stderr(1, "integrity check of charon failed");
+               library_deinit();
+               exit(SS_RC_DAEMON_INTEGRITY);
+       }
+
+       if (!libcharon_init())
+       {
+               dbg_stderr(1, "initialization failed - aborting charon");
+               libcharon_deinit();
+               library_deinit();
+               exit(SS_RC_INITIALIZATION_FAILED);
+       }
+
+       /* use CTRL loglevel for default */
+       for (group = 0; group < DBG_MAX; group++)
+       {
+               levels[group] = LEVEL_CTRL;
+       }
+
+       /* handle arguments */
+       for (;;)
+       {
+               struct option long_opts[] = {
+                       { "help", no_argument, NULL, 'h' },
+                       { "version", no_argument, NULL, 'v' },
+                       { "use-syslog", no_argument, NULL, 'l' },
+                       /* TODO: handle "debug-all" */
+                       { "debug-dmn", required_argument, &group, DBG_DMN },
+                       { "debug-mgr", required_argument, &group, DBG_MGR },
+                       { "debug-ike", required_argument, &group, DBG_IKE },
+                       { "debug-chd", required_argument, &group, DBG_CHD },
+                       { "debug-job", required_argument, &group, DBG_JOB },
+                       { "debug-cfg", required_argument, &group, DBG_CFG },
+                       { "debug-knl", required_argument, &group, DBG_KNL },
+                       { "debug-net", required_argument, &group, DBG_NET },
+                       { "debug-enc", required_argument, &group, DBG_ENC },
+                       { "debug-lib", required_argument, &group, DBG_LIB },
+                       { 0,0,0,0 }
+               };
+
+               int c = getopt_long(argc, argv, "", long_opts, NULL);
+               switch (c)
+               {
+                       case EOF:
+                               break;
+                       case 'h':
+                               usage(NULL);
+                               break;
+                       case 'v':
+                               printf("Linux strongSwan %s\n", VERSION);
+                               exit(0);
+                       case 'l':
+                               use_syslog = TRUE;
+                               continue;
+                       case 0:
+                               /* option is in group */
+                               levels[group] = atoi(optarg);
+                               continue;
+                       default:
+                               usage("");
+                               break;
+               }
+               break;
+       }
+
+       if (!lookup_uid_gid())
+       {
+               dbg_stderr(1, "invalid uid/gid - aborting charon");
+               libcharon_deinit();
+               library_deinit();
+               exit(SS_RC_INITIALIZATION_FAILED);
+       }
+
+       /* initialize daemon */
+       if (!charon->initialize(charon, use_syslog, levels))
+       {
+               DBG1(DBG_DMN, "initialization failed - aborting charon");
+               libcharon_deinit();
+               library_deinit();
+               exit(SS_RC_INITIALIZATION_FAILED);
+       }
+
+       if (check_pidfile())
+       {
+               DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
+               libcharon_deinit();
+               library_deinit();
+               exit(-1);
+       }
+
+       if (!drop_capabilities())
+       {
+               DBG1(DBG_DMN, "capability dropping failed - aborting charon");
+               libcharon_deinit();
+               library_deinit();
+               exit(SS_RC_INITIALIZATION_FAILED);
+       }
+
+       /* add handler for SEGV and ILL,
+        * INT, TERM and HUP are handled by sigwait() in run() */
+       action.sa_handler = segv_handler;
+       action.sa_flags = 0;
+       sigemptyset(&action.sa_mask);
+       sigaddset(&action.sa_mask, SIGINT);
+       sigaddset(&action.sa_mask, SIGTERM);
+       sigaddset(&action.sa_mask, SIGHUP);
+       sigaction(SIGSEGV, &action, NULL);
+       sigaction(SIGILL, &action, NULL);
+       sigaction(SIGBUS, &action, NULL);
+       action.sa_handler = SIG_IGN;
+       sigaction(SIGPIPE, &action, NULL);
+
+       pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
+
+       /* start daemon (i.e. the threads in the thread-pool) */
+       charon->start(charon);
+
+       /* main thread goes to run loop */
+       run();
+
+       /* normal termination, cleanup and exit */
+       libcharon_deinit();
+       library_deinit();
+
+       unlink(PID_FILE);
+
+       return 0;
+}
+