gisi: low-level modem scoping for sockets

gisi/Makefile.am

@@ -1,10 +1,10 @@
-AM_CFLAGS = @GLIB_CFLAGS@
+AM_CFLAGS = @GLIB_CFLAGS@ -I$(top_srcdir)
 
 noinst_LTLIBRARIES = libgisi.la
 MAINTAINERCLEANFILES = Makefile.in
 
 libgisi_la_SOURCES = \
-	phonet.h \
+	phonet.h isicommon.h \
 	netlink.h netlink.c \
 	socket.h socket.c \
 	client.h client.c \

gisi/client.c

@@ -112,7 +112,7 @@ GIsiClient *g_isi_client_create(uint8_t resource)
 	cl->next[254] = 0;
 	cl->prev[255] = cl->next[255] = 255;
 
-	channel = phonet_new(resource);
+	channel = phonet_new(NULL, resource);
 	if (channel == NULL) {
 		free(cl);
 		return NULL;
@@ -264,7 +264,7 @@ static int g_isi_indication_init(GIsiClient *cl)
 	uint8_t msg[] = {
 		0, PNS_SUBSCRIBED_RESOURCES_IND, 1, cl->resource,
 	};
-	GIOChannel *channel = phonet_new(PN_COMMGR);
+	GIOChannel *channel = phonet_new(NULL, PN_COMMGR);
 
 	if (channel == NULL)
 		return errno;

gisi/modem.h

@@ -0,0 +1,28 @@
+/**
+ * Copyright (C) 2009 Nokia Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it 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
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#ifndef GISI_MODEM_H
+#define GISI_MODEM_H
+
+typedef struct _GIsiModem GIsiModem;
+
+static inline unsigned g_isi_modem_index(GIsiModem *m)
+{
+	return (uintptr_t)m;
+}
+
+#endif

gisi/socket.c

@@ -30,35 +30,44 @@
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
+#include <net/if.h>
 #include <fcntl.h>
+#include "modem.h"
 #include "phonet.h"
 #include <glib.h>
 
 #include "socket.h"
 
-GIOChannel *phonet_new(uint8_t resource)
+GIOChannel *phonet_new(GIsiModem *modem, uint8_t resource)
 {
 	GIOChannel *channel;
 	struct sockaddr_pn addr = {
 		.spn_family = AF_PHONET,
 		.spn_resource = resource,
 	};
+	unsigned ifi = g_isi_modem_index(modem);
+	char buf[IF_NAMESIZE];
 
 	int fd = socket(PF_PHONET, SOCK_DGRAM, 0);
 	if (fd == -1)
 		return NULL;
 	fcntl(fd, F_SETFD, FD_CLOEXEC);
 	/* Use blocking mode on purpose. */
-	if (bind(fd, (struct sockaddr *)&addr, sizeof(addr))) {
-		close(fd);
-		return NULL;
-	}
+
+	if (if_indextoname(ifi, buf) == NULL ||
+	    setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, buf, IF_NAMESIZE))
+		goto error;
+	if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)))
+		goto error;
 
 	channel = g_io_channel_unix_new(fd);
 	g_io_channel_set_close_on_unref(channel, TRUE);
 	g_io_channel_set_encoding(channel, NULL, NULL);
 	g_io_channel_set_buffered(channel, FALSE);
 	return channel;
+error:
+	close(fd);
+	return NULL;
 }
 
 size_t phonet_peek_length(GIOChannel *channel)

gisi/socket.h

@@ -21,7 +21,9 @@
  *
  */
 
-GIOChannel *phonet_new(uint8_t resource);
+#include "modem.h"
+
+GIOChannel *phonet_new(GIsiModem *, uint8_t resource);
 size_t phonet_peek_length(GIOChannel *io);
 ssize_t phonet_read(GIOChannel *io, void *restrict buf, size_t len,
 			uint16_t *restrict obj, uint8_t *restrict res);