Timur Davydov has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmocore/+/41939?usp=email )
Change subject: core: always build tun.c and gate TUN support by headers
......................................................................
core: always build tun.c and gate TUN support by headers
Always build tun.c and move platform-specific checks into the
implementation.
Guard the TUN-specific code paths based on the availability of
linux/if_tun.h detected at configure time. If TUN support is not
available, osmo_tundev_open() returns -ENOTSUP.
This keeps the public TUN API available while disabling unsupported
functionality in a capability-based way.
Change-Id: I6d1ea1644d12ef59a54cf2f73b9155def58b17a9
---
M configure.ac
M src/core/tun.c
2 files changed, 10 insertions(+), 3 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/39/41939/1
diff --git a/configure.ac b/configure.ac
index 2fd6fca..d0cdb32 100644
--- a/configure.ac
+++ b/configure.ac
@@ -627,6 +627,9 @@
CHECK_BUILTIN_SUPPORT([__builtin_cpu_supports],
[Runtime SIMD detection will be disabled])
+dnl Check header linux/if_tun.h
+AC_CHECK_HEADERS([linux/if_tun.h])
+
dnl Check header linux/tcp.h
AC_CHECK_HEADERS([linux/tcp.h])
diff --git a/src/core/tun.c b/src/core/tun.c
index 09a3f81..537caf9 100644
--- a/src/core/tun.c
+++ b/src/core/tun.c
@@ -84,10 +84,8 @@
#include <sys/time.h>
#include <net/if.h>
-#if defined(__linux__)
+#ifdef HAVE_LINUX_IF_TUN_H
#include <linux/if_tun.h>
-#else
-#error "Unknown platform!"
#endif
#include <osmocom/core/utils.h>
@@ -265,6 +263,7 @@
talloc_free(tundev);
}
+#ifdef HAVE_LINUX_IF_TUN_H
/*! Open and configure fd of the tunnel device.
* \param[in] tundev The tundev object whose tunnel interface to open
* \param[in] flags internal linux flags to pass when creating the device
(not used yet)
@@ -337,6 +336,7 @@
close(fd);
return rc;
}
+#endif /* HAVE_LINUX_IF_TUN_H */
/*! Open the tunnel device owned by the tundev object.
* \param[in] tundev The tundev object to open
@@ -344,6 +344,7 @@
*/
int osmo_tundev_open(struct osmo_tundev *tundev)
{
+#ifdef HAVE_LINUX_IF_TUN_H
struct osmo_netns_switch_state switch_state;
int rc;
int netns_fd = -1;
@@ -418,6 +419,9 @@
if (netns_fd >= 0)
close(netns_fd);
return rc;
+#else
+ return -ENOTSUP;
+#endif /* HAVE_LINUX_IF_TUN_H */
}
/*! Close the tunnel device owned by the tundev object.
--
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Gerrit-MessageType: newchange
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I6d1ea1644d12ef59a54cf2f73b9155def58b17a9
Gerrit-Change-Number: 41939
Gerrit-PatchSet: 1
Gerrit-Owner: Timur Davydov <[email protected]>
