1 files changed, 288 insertions, 0 deletions
diff --git a/apps/app_dahdiras.c b/apps/app_dahdiras.c
new file mode 100644
index 000000000..4ac5daa3d
--- /dev/null
+++ b/apps/app_dahdiras.c
@@ -0,0 +1,288 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Execute an ISDN RAS
+ *
+ * \author Mark Spencer <markster@digium.com>
+ * 
+ * \ingroup applications
+ */
+
+/*** MODULEINFO
+	<depend>dahdi</depend>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#ifdef __linux__
+#include <sys/signal.h>
+#else
+#include <signal.h>
+#endif /* __linux__ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/file.h"
+#include "asterisk/logger.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/module.h"
+#include "asterisk/options.h"
+
+#include "asterisk/dahdi_compat.h"
+
+static char *dahdi_app = "DAHDIRAS";
+static char *zap_app = "ZapRAS";
+
+static char *dahdi_synopsis = "Executes DAHDI ISDN RAS application";
+static char *zap_synopsis = "Executes Zaptel ISDN RAS application";
+
+static char *dahdi_descrip =
+"  DAHDIRAS(args): Executes a RAS server using pppd on the given channel.\n"
+"The channel must be a clear channel (i.e. PRI source) and a DAHDI\n"
+"channel to be able to use this function (no modem emulation is included).\n"
+"Your pppd must have the DAHDI plugin available. Arguments should be\n"
+"separated by | characters.\n";
+
+static char *zap_descrip =
+"  ZapRAS(args): Executes a RAS server using pppd on the given channel.\n"
+"The channel must be a clear channel (i.e. PRI source) and a Zaptel\n"
+"channel to be able to use this function (no modem emulation is included).\n"
+"Your pppd must have the Zaptel plugin available. Arguments should be\n"
+"separated by | characters.\n";
+
+#define PPP_MAX_ARGS	32
+#define PPP_EXEC	"/usr/sbin/pppd"
+
+static pid_t spawn_ras(struct ast_channel *chan, char *args)
+{
+	pid_t pid;
+	int x;	
+	char *c;
+
+	char *argv[PPP_MAX_ARGS];
+	int argc = 0;
+	char *stringp=NULL;
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
+
+	/* Start by forking */
+	pid = fork();
+	if (pid) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+		return pid;
+	}
+
+	/* Restore original signal handlers */
+	for (x=0;x<NSIG;x++)
+		signal(x, SIG_DFL);
+
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
+
+	/* Execute RAS on File handles */
+	dup2(chan->fds[0], STDIN_FILENO);
+
+	/* Drop high priority */
+	if (ast_opt_high_priority)
+		ast_set_priority(0);
+
+	/* Close other file descriptors */
+	for (x=STDERR_FILENO + 1;x<1024;x++) 
+		close(x);
+
+	/* Reset all arguments */
+	memset(argv, 0, sizeof(argv));
+
+	/* First argument is executable, followed by standard
+	   arguments for DAHDI PPP */
+	argv[argc++] = PPP_EXEC;
+	argv[argc++] = "nodetach";
+
+	/* And all the other arguments */
+	stringp=args;
+	c = strsep(&stringp, "|");
+	while(c && strlen(c) && (argc < (PPP_MAX_ARGS - 4))) {
+		argv[argc++] = c;
+		c = strsep(&stringp, "|");
+	}
+
+	argv[argc++] = "plugin";
+#ifdef HAVE_ZAPTEL
+	argv[argc++] = "zaptel.so";
+#else
+	argv[argc++] = "dahdi.so";
+#endif
+	argv[argc++] = "stdin";
+
+	/* Finally launch PPP */
+	execv(PPP_EXEC, argv);
+	fprintf(stderr, "Failed to exec PPPD!\n");
+	exit(1);
+}
+
+static void run_ras(struct ast_channel *chan, char *args)
+{
+	pid_t pid;
+	int status;
+	int res;
+	int signalled = 0;
+	struct dahdi_bufferinfo savebi;
+	int x;
+	
+	res = ioctl(chan->fds[0], DAHDI_GET_BUFINFO, &savebi);
+	if(res) {
+		ast_log(LOG_WARNING, "Unable to check buffer policy on channel %s\n", chan->name);
+		return;
+	}
+
+	pid = spawn_ras(chan, args);
+	if (pid < 0) {
+		ast_log(LOG_WARNING, "Failed to spawn RAS\n");
+	} else {
+		for (;;) {
+			res = wait4(pid, &status, WNOHANG, NULL);
+			if (!res) {
+				/* Check for hangup */
+				if (chan->_softhangup && !signalled) {
+					ast_log(LOG_DEBUG, "Channel '%s' hungup.  Signalling RAS at %d to die...\n", chan->name, pid);
+					kill(pid, SIGTERM);
+					signalled=1;
+				}
+				/* Try again */
+				sleep(1);
+				continue;
+			}
+			if (res < 0) {
+				ast_log(LOG_WARNING, "wait4 returned %d: %s\n", res, strerror(errno));
+			}
+			if (option_verbose > 2) {
+				if (WIFEXITED(status)) {
+					ast_verbose(VERBOSE_PREFIX_3 "RAS on %s terminated with status %d\n", chan->name, WEXITSTATUS(status));
+				} else if (WIFSIGNALED(status)) {
+					ast_verbose(VERBOSE_PREFIX_3 "RAS on %s terminated with signal %d\n", 
+						 chan->name, WTERMSIG(status));
+				} else {
+					ast_verbose(VERBOSE_PREFIX_3 "RAS on %s terminated weirdly.\n", chan->name);
+				}
+			}
+			/* Throw back into audio mode */
+			x = 1;
+			ioctl(chan->fds[0], DAHDI_AUDIOMODE, &x);
+
+			/* Restore saved values */
+			res = ioctl(chan->fds[0], DAHDI_SET_BUFINFO, &savebi);
+			if (res < 0) {
+				ast_log(LOG_WARNING, "Unable to set buffer policy on channel %s\n", chan->name);
+			}
+			break;
+		}
+	}
+}
+
+static int exec(struct ast_channel *chan, void *data)
+{
+	int res=-1;
+	char *args;
+	struct ast_module_user *u;
+	struct dahdi_params ztp;
+
+	if (!data) 
+		data = "";
+
+	u = ast_module_user_add(chan);
+
+	args = ast_strdupa(data);
+	
+	/* Answer the channel if it's not up */
+	if (chan->_state != AST_STATE_UP)
+		ast_answer(chan);
+	if (strcasecmp(chan->tech->type, dahdi_chan_name)) {
+		if (option_verbose > 1)
+			ast_verbose(VERBOSE_PREFIX_2 "Channel %s is not a %s channel\n", chan->name, dahdi_chan_name);
+		sleep(2);
+	} else {
+		memset(&ztp, 0, sizeof(ztp));
+		if (ioctl(chan->fds[0], DAHDI_GET_PARAMS, &ztp)) {
+			ast_log(LOG_WARNING, "Unable to get parameters\n");
+		} else if (ztp.sigtype != DAHDI_SIG_CLEAR) {
+			if (option_verbose > 1)
+				ast_verbose(VERBOSE_PREFIX_2 "Channel %s is not a clear channel\n", chan->name);
+		} else {
+			/* Everything should be okay.  Run PPP. */
+			if (option_verbose > 2)
+				ast_verbose(VERBOSE_PREFIX_3 "Starting RAS on %s\n", chan->name);
+			/* Execute RAS */
+			run_ras(chan, args);
+		}
+	}
+	ast_module_user_remove(u);
+	return res;
+}
+
+static int exec_warn(struct ast_channel *chan, void *data)
+{
+	ast_log(LOG_WARNING, "Use of the command %s is deprecated, please use %s instead.\n", zap_app, dahdi_app);
+
+	return exec(chan, data);
+}
+
+static int unload_module(void) 
+{
+	int res = 0;
+
+	if (*dahdi_chan_mode == CHAN_DAHDI_PLUS_ZAP_MODE) {
+		res |= ast_unregister_application(dahdi_app);
+	}
+
+	res |= ast_unregister_application(zap_app);
+	
+	ast_module_user_hangup_all();
+
+	return res;
+}
+
+static int load_module(void)
+{
+	int res = 0;
+
+	if (*dahdi_chan_mode == CHAN_DAHDI_PLUS_ZAP_MODE) {
+		res |= ast_register_application(dahdi_app, exec, dahdi_synopsis, dahdi_descrip);
+	}
+
+	res |= ast_register_application(zap_app, exec_warn, zap_synopsis, zap_descrip);
+
+	return res;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "DAHDI RAS Application");
+