[Bluez-devel] [PATCH] audio - ignore permission denied errors on avctp and avdtp sockets

[Bluez-devel] [PATCH] audio - ignore permission denied errors on avctp and avdtp sockets

[Bastian Blank]

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Hi

The attached patch ignores permission denied errors from the bind on
avctp and avdtp sockets. This bind is only allowed for root since some
kernel versions and disabling is better than failing completely if run
without root priviledges.

Bastian

-- 
Each kiss is as the first.
		-- Miramanee, Kirk's wife, "The Paradise Syndrome",
		   stardate 4842.6

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Index: audio/avdtp.c
===================================================================
RCS file: /cvsroot/bluez/utils/audio/avdtp.c,v
retrieving revision 1.60
diff -u -r1.60 avdtp.c
--- audio/avdtp.c	3 Dec 2007 22:41:29 -0000	1.60
+++ audio/avdtp.c	4 Dec 2007 23:21:00 -0000
@@ -364,6 +364,7 @@
 static GSList *local_seps = NULL;
 
 static GIOChannel *avdtp_server = NULL;
+static gboolean avdtp_server_failed;
 
 static GSList *sessions = NULL;
 
@@ -2866,23 +2867,22 @@
 	return TRUE;
 }
 
-static GIOChannel *avdtp_server_socket(void)
+static int avdtp_server_socket(GIOChannel **io)
 {
 	int sock, lm;
 	struct sockaddr_l2 addr;
-	GIOChannel *io;
 
 	sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
 	if (sock < 0) {
 		error("AVDTP server socket: %s (%d)", strerror(errno), errno);
-		return NULL;
+		return -1;
 	}
 
 	lm = L2CAP_LM_SECURE;
 	if (setsockopt(sock, SOL_L2CAP, L2CAP_LM, &lm, sizeof(lm)) < 0) {
 		error("AVDTP server setsockopt: %s (%d)", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
 	memset(&addr, 0, sizeof(addr));
@@ -2891,25 +2891,31 @@
 	addr.l2_psm = htobs(AVDTP_PSM);
 
 	if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+		if (errno == EACCES) {
+			info("AVDTP server bind failed, disabling support");
+			close(sock);
+			return 0;
+		}
+
 		error("AVDTP server bind: %s", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
 	if (listen(sock, 4) < 0) {
 		error("AVDTP server listen: %s", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
-	io = g_io_channel_unix_new(sock);
-	if (!io) {
+	*io = g_io_channel_unix_new(sock);
+	if (!*io) {
 		error("Unable to allocate new io channel");
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
-	return io;
+	return 1;
 }
 
 const char *avdtp_strerror(struct avdtp_error *err)
@@ -2972,12 +2978,17 @@
 
 int avdtp_init(void)
 {
-	if (avdtp_server)
+	int ret;
+
+	if (avdtp_server || avdtp_server_failed)
 		return 0;
 
-	avdtp_server = avdtp_server_socket();
-	if (!avdtp_server)
-		return -1;
+	ret = avdtp_server_socket(&avdtp_server);
+
+	if (ret <= 0) {
+		avdtp_server_failed = TRUE;
+		return ret;
+	}
 
 	g_io_add_watch(avdtp_server, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
 			(GIOFunc) avdtp_server_cb, NULL);
Index: audio/control.c
===================================================================
RCS file: /cvsroot/bluez/utils/audio/control.c,v
retrieving revision 1.11
diff -u -r1.11 control.c
--- audio/control.c	27 Nov 2007 09:15:16 -0000	1.11
+++ audio/control.c	4 Dec 2007 23:21:01 -0000
@@ -99,6 +99,7 @@
 static uint32_t ct_record_id = 0;
 
 static GIOChannel *avctp_server = NULL;
+static gboolean avctp_server_failed;
 
 static GSList *sessions = NULL;
 
@@ -309,23 +310,22 @@
 	return ret;
 }
 
-static GIOChannel *avctp_server_socket(void)
+static int avctp_server_socket(GIOChannel **io)
 {
 	int sock, lm;
 	struct sockaddr_l2 addr;
-	GIOChannel *io;
 
 	sock = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
 	if (sock < 0) {
 		error("AVCTP server socket: %s (%d)", strerror(errno), errno);
-		return NULL;
+		return -1;
 	}
 
 	lm = L2CAP_LM_SECURE;
 	if (setsockopt(sock, SOL_L2CAP, L2CAP_LM, &lm, sizeof(lm)) < 0) {
 		error("AVCTP server setsockopt: %s (%d)", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
 	memset(&addr, 0, sizeof(addr));
@@ -334,25 +334,31 @@
 	addr.l2_psm = htobs(AVCTP_PSM);
 
 	if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+		if (errno == EACCES) {
+			info("AVCTP server bind failed, disabling control support");
+			close(sock);
+			return 0;
+		}
+
 		error("AVCTP server bind: %s", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
 	if (listen(sock, 4) < 0) {
 		error("AVCTP server listen: %s", strerror(errno), errno);
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
-	io = g_io_channel_unix_new(sock);
-	if (!io) {
+	*io = g_io_channel_unix_new(sock);
+	if (!*io) {
 		error("Unable to allocate new io channel");
 		close(sock);
-		return NULL;
+		return -1;
 	}
 
-	return io;
+	return 1;
 }
 
 static struct avctp *find_session(bdaddr_t *src, bdaddr_t *dst)
@@ -964,8 +970,9 @@
 int avrcp_init(DBusConnection *conn)
 {
 	sdp_buf_t buf;
+	int ret;
 
-	if (avctp_server)
+	if (avctp_server || avctp_server_failed)
 		return 0;
 
 	connection = dbus_connection_ref(conn);
@@ -996,9 +1003,12 @@
 		return -1;
 	}
 
-	avctp_server = avctp_server_socket();
-	if (!avctp_server)
-		return -1;
+	ret = avctp_server_socket(&avctp_server);
+
+	if (ret <= 0) {
+		avctp_server_failed = TRUE;
+		return ret;
+	}
 
 	g_io_add_watch(avctp_server, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
 			(GIOFunc) avctp_server_cb, NULL);
Index: audio/sink.c
===================================================================
RCS file: /cvsroot/bluez/utils/audio/sink.c,v
retrieving revision 1.38
diff -u -r1.38 sink.c
--- audio/sink.c	3 Dec 2007 22:41:29 -0000	1.38
+++ audio/sink.c	4 Dec 2007 23:21:03 -0000
@@ -46,6 +46,14 @@
 
 #define STREAM_SETUP_RETRY_TIMER 2000
 
+#ifndef MIN
+# define MIN(x, y) ((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef MAX
+# define MAX(x, y) ((x) > (y) ? (x) : (y))
+#endif
+
 struct pending_request {
 	DBusConnection *conn;
 	DBusMessage *msg;

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[Bluez-devel] Possible Race condition in Rfcomm TTY

[Denis KENZIOR]

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Marcel,

I think there is a race condition in the RFCOMM Socket -> TTY adaptation.  
Basically whenever a client device connects and starts sending data right 
away, the serial port will not receive it.

To see what I mean:

run 'rfcomm -r listen 0 15' on a server.

and run a simple test app that sends data right after connecting (one 
attached).

Once connection has been established, run 'cat /dev/rfcomm0' 

Using my Suse 10.2 desktop with kernel 2.6.18.8 and Neo with kernel 2.6.22.5 
(Nov 26 snapshot), about 95% of the time the initial data sent never shows up 
on the serial port.  If I reverse the roles, the desktop usually gets the 
initial chunk of data.  This inconsistency makes it hard to implement 
something like the DUN or Handsfree services where clients very frequently 
send data right away.

Looking at the kernel code it seems that the data is copied into the socket 
buf or into the serial buf from the rfcomm_recv_data.  It also seems that 
rfcomm_dev_add never copies what is in the socket buffer to what is in the 
serial buffer.  It would seem that rfomm_dev_add should also copy any pending 
data from a socket read buffer to the serial port read buffer whenever doing 
the conversion.  Or is there something else going on here?

-Denis


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#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <termios.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/sco.h>
#include <bluetooth/rfcomm.h>

static volatile int terminate = 0;

static void sig_term(int sig) {
	terminate = 1;
}

static int rfcomm_connect(bdaddr_t *src, bdaddr_t *dst, uint8_t channel)
{
	struct sockaddr_rc addr;
	int s;

	if ((s = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0) {
		return -1;
	}

	memset(&addr, 0, sizeof(addr));
	addr.rc_family = AF_BLUETOOTH;
	bacpy(&addr.rc_bdaddr, src);
	addr.rc_channel = 0;
	if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
		close(s);
		return -1;
	}

	memset(&addr, 0, sizeof(addr));
	addr.rc_family = AF_BLUETOOTH;
	bacpy(&addr.rc_bdaddr, dst);
	addr.rc_channel = channel;
	if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0 ){
		close(s);
		return -1;
	}
	return s;
}

static void usage(void)
{
	printf("Usage:\n"
		"\trfc <bdaddr> [channel]\n");
}

int main(int argc, char *argv[])
{
	struct sigaction sa;

	fd_set rfds;
	struct timeval timeout;
	unsigned char buf[2048], *p;
	int maxfd, sel, rlen, wlen;

	bdaddr_t local;
	bdaddr_t bdaddr;
	uint8_t channel;

	char *filename;
	mode_t filemode;
	int err, mode = 0;
	int dd, rd, sd, fd;
	uint16_t sco_handle, sco_mtu, vs;

	switch (argc) {
	case 2:
		str2ba(argv[1], &bdaddr);
		channel = 6;
		break;
	case 3:
		str2ba(argv[1], &bdaddr);
		channel = atoi(argv[2]);
		break;
	default:
		usage();
		exit(-1);
	}

	hci_devba(0, &local);
	
	memset(&sa, 0, sizeof(sa));
	sa.sa_flags = SA_NOCLDSTOP;
	sa.sa_handler = sig_term;
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGINT,  &sa, NULL);

	sa.sa_handler = SIG_IGN;
	sigaction(SIGCHLD, &sa, NULL);
	sigaction(SIGPIPE, &sa, NULL);

	if ((rd = rfcomm_connect(&local, &bdaddr, channel)) < 0) {
		perror("Can't connect RFCOMM channel");
		return -1;
	}

	fprintf(stderr, "RFCOMM channel connected\n");

	fprintf(stderr, "Sending BRSF\n");
	write(rd, "AT+BRSF=24\r\n", 12);

	while (!terminate) {
		FD_ZERO(&rfds);
		FD_SET(rd, &rfds);
		FD_SET(fileno(stdin), &rfds);

		timeout.tv_sec = 0;
		timeout.tv_usec = 10000;

		if ((sel = select(rd + 1, &rfds, NULL, NULL, &timeout)) > 0) {
			if (FD_ISSET(rd, &rfds)) {
				memset(buf, 0, sizeof(buf));
				rlen = read(rd, buf, sizeof(buf));
				if (rlen > 0) {
					fprintf(stderr, "%s\n", buf);
				} else {
					break;
				}				
			}
			
			if (FD_ISSET(fileno(stdin), &rfds)) {
				memset(buf, 0, sizeof(buf));
				rlen = read(fileno(stdin), buf, sizeof(buf));
				if (rlen > 0) {
					fprintf(stderr, "Sending->%s", buf);
					wlen = write(rd, buf, rlen);
				}
				else {
					break;
				}
			}
		}
	}

	close(rd);

	return 0;
}

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Re: [Bluez-devel] Possible Race condition in Rfcomm TTY

[Marcel Holtmann]

Hi Denis,

> I think there is a race condition in the RFCOMM Socket -> TTY adaptation.  
> Basically whenever a client device connects and starts sending data right 
> away, the serial port will not receive it.
> 
> To see what I mean:
> 
> run 'rfcomm -r listen 0 15' on a server.
> 
> and run a simple test app that sends data right after connecting (one 
> attached).
> 
> Once connection has been established, run 'cat /dev/rfcomm0' 
> 
> Using my Suse 10.2 desktop with kernel 2.6.18.8 and Neo with kernel 2.6.22.5 
> (Nov 26 snapshot), about 95% of the time the initial data sent never shows up 
> on the serial port.  If I reverse the roles, the desktop usually gets the 
> initial chunk of data.  This inconsistency makes it hard to implement 
> something like the DUN or Handsfree services where clients very frequently 
> send data right away.

I am not a big fan of the TTY support at all. It had more problems in
the end than we ever expected. Using the socket directly is always the
better approach.

For Handsfree, I would prefer if the audio service will be extended and
that is what is currently planned. For DUN you can use the serial
service proxy feature. This can directly attach to a physical TTY or to
a Unix socket.

> Looking at the kernel code it seems that the data is copied into the socket 
> buf or into the serial buf from the rfcomm_recv_data.  It also seems that 
> rfcomm_dev_add never copies what is in the socket buffer to what is in the 
> serial buffer.  It would seem that rfomm_dev_add should also copy any pending 
> data from a socket read buffer to the serial port read buffer whenever doing 
> the conversion.  Or is there something else going on here?

No. That is probably it. Feel free to send a patch.

Regards

Marcel



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Re: [Bluez-devel] [PATCH] audio - ignore permission denied errors on avctp and avdtp sockets

[Marcel Holtmann]

Hi Bastien,

> The attached patch ignores permission denied errors from the bind on
> avctp and avdtp sockets. This bind is only allowed for root since some
> kernel versions and disabling is better than failing completely if run
> without root priviledges.

and why do you wanna run the service without proper permission? If you
don't want AVDTP or AVCTP, then disable it in the audio.conf file.

Regards

Marcel



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