From d010a8996cd51fdab1adb00f59c08cb152d233b9 Mon Sep 17 00:00:00 2001
From: Karsten Keil <kkeil@linux-pingi.de>
Date: Wed, 21 Mar 2012 15:19:45 +0100
Subject: [PATCH] Set mISDNcapi egid to MISDN_GROUP

To allow access to the filesystem socket the effective group is changed
to the MISDN_GROUP, which is uucp or dialout usually.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
---
 capi20/Makefile.am |  2 +-
 capi20/Makefile.in |  2 +-
 capi20/daemon.c    | 16 ++++++++++++++++
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/capi20/Makefile.am b/capi20/Makefile.am
index 1a6c056..c76eb0f 100644
--- a/capi20/Makefile.am
+++ b/capi20/Makefile.am
@@ -14,7 +14,7 @@ else
 	_USE_SOFTFAX =
 endif
 
-AM_CPPFLAGS = -I$(top_srcdir)/include -Werror -Wall $(_USE_SOFTFAX) $(_MEMLEAKDEBUG)
+AM_CPPFLAGS = -I$(top_srcdir)/include -Werror -Wall $(_USE_SOFTFAX) $(_MEMLEAKDEBUG) -DMISDN_GROUP=\"$(MISDN_GROUP)\"
 
 EXTRA_DIST = capi20.conf.sample
 
diff --git a/capi20/Makefile.in b/capi20/Makefile.in
index 1025071..2cb1ad3 100644
--- a/capi20/Makefile.in
+++ b/capi20/Makefile.in
@@ -204,7 +204,7 @@ mISDNcapid_SOURCES = daemon.c application.c lplci.c mplci.c ncci.c m_capi.h m_ca
 
 mISDNcapid_LDADD = ../lib/libmisdn.la -lcapi20
 mISDNcapid_LDFLAGS = -shared
-AM_CPPFLAGS = -I$(top_srcdir)/include -Werror -Wall $(_USE_SOFTFAX) $(_MEMLEAKDEBUG)
+AM_CPPFLAGS = -I$(top_srcdir)/include -Werror -Wall $(_USE_SOFTFAX) $(_MEMLEAKDEBUG) -DMISDN_GROUP=\"$(MISDN_GROUP)\"
 EXTRA_DIST = capi20.conf.sample
 CLEANFILES = *~
 MISDN_SOCKET_DIR = /var/run/mISDNcapid
diff --git a/capi20/daemon.c b/capi20/daemon.c
index 1a7de12..f76052e 100644
--- a/capi20/daemon.c
+++ b/capi20/daemon.c
@@ -23,6 +23,8 @@
 #include <string.h>
 #include <signal.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <grp.h>
 #include "m_capi.h"
 #include "mc_buffer.h"
 #include "m_capi_sock.h"
@@ -1478,6 +1480,7 @@ int main(int argc, char *argv[])
 	int ret, i, j, nb, c, exitcode = 1, ver, libdebug;
 	struct sockaddr_un mcaddr;
 	struct pController *pc;
+	struct group *grp;
 
 	KeepTemporaryFiles = 0;
 	config_file = def_config;
@@ -1501,6 +1504,19 @@ int main(int argc, char *argv[])
 	mISDN_set_debug_level(libdebug);
 	iprint("Init mISDN lib version %x, debug = %x (%x)\n", ver, debugmask, libdebug);
 
+	grp = getgrnam(MISDN_GROUP);
+	if (!grp) {
+		fprintf(stderr, "Cannot get %s group ID - %s\n", MISDN_GROUP, strerror(errno));
+		return 1;
+	} else {
+		if (setegid(grp->gr_gid) < 0) {
+			fprintf(stderr, "Cannot set effective group to %s gid:%d - %s\n",
+				MISDN_GROUP, (int)grp->gr_gid, strerror(errno));
+			return 1;
+		}
+		iprint("Did set eGID to %s gid:%d\n", MISDN_GROUP, (int)grp->gr_gid);
+	}
+
 	mc_buffer_init();
 
 	snprintf(_TempDirectory, 80, "%s/mISDNd_XXXXXX", MISDND_TEMP_DIR);