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-rw-r--r--src/charon/charon.c417
1 files changed, 417 insertions, 0 deletions
diff --git a/src/charon/charon.c b/src/charon/charon.c
new file mode 100644
index 000000000..9b552fb62
--- /dev/null
+++ b/src/charon/charon.c
@@ -0,0 +1,417 @@
+/*
+ * 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 <hydra.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) (debug_t group, level_t level, char *fmt, ...);
+
+/**
+ * Logging hook for library logs, using stderr output
+ */
+static void dbg_stderr(debug_t group, level_t level, char *fmt, ...)
+{
+ va_list args;
+
+ if (level <= 1)
+ {
+ va_start(args, fmt);
+ fprintf(stderr, "00[%N] ", debug_names, group);
+ 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, status = SS_RC_INITIALIZATION_FAILED;
+
+ /* 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(DBG_DMN, 1, "integrity check of charon failed");
+ library_deinit();
+ exit(SS_RC_DAEMON_INTEGRITY);
+ }
+
+ if (!libhydra_init("charon"))
+ {
+ dbg_stderr(DBG_DMN, 1, "initialization failed - aborting charon");
+ libhydra_deinit();
+ library_deinit();
+ exit(SS_RC_INITIALIZATION_FAILED);
+ }
+
+ if (!libcharon_init())
+ {
+ dbg_stderr(DBG_DMN, 1, "initialization failed - aborting charon");
+ goto deinit;
+ }
+
+ /* 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);
+ status = 0;
+ goto deinit;
+ 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(DBG_DMN, 1, "invalid uid/gid - aborting charon");
+ goto deinit;
+ }
+
+ /* initialize daemon */
+ if (!charon->initialize(charon, use_syslog, levels))
+ {
+ DBG1(DBG_DMN, "initialization failed - aborting charon");
+ goto deinit;
+ }
+
+ if (check_pidfile())
+ {
+ DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
+ status = -1;
+ goto deinit;
+ }
+
+ if (!drop_capabilities())
+ {
+ DBG1(DBG_DMN, "capability dropping failed - aborting charon");
+ goto deinit;
+ }
+
+ /* 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 */
+ unlink(PID_FILE);
+ status = 0;
+
+deinit:
+ libcharon_deinit();
+ libhydra_deinit();
+ library_deinit();
+ return status;
+}
+
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