[libvirt] [PATCH v2 04/11] util: add virGetUNIXSocketPath helper
When receiving multiple socket FDs from systemd, it is critical to know
what socket address each corresponds to so we can setup the right
protocols on each.
Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com>
---
src/libvirt_private.syms | 1 +
src/util/virutil.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
src/util/virutil.h | 1 +
3 files changed, 47 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index bc8cc1fba9..54e3b9130b 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2962,6 +2962,7 @@ virGetListenFDs;
virGetSelfLastChanged;
virGetSystemPageSize;
virGetSystemPageSizeKB;
+virGetUNIXSocketPath;
virGetUnprivSGIOSysfsPath;
virGetUserCacheDirectory;
virGetUserConfigDirectory;
diff --git a/src/util/virutil.c b/src/util/virutil.c
index e9dbaf3d7a..8352e0f1f1 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -68,6 +68,10 @@
# include <shlobj.h>
#endif
+#ifdef HAVE_SYS_UN_H
+# include <sys/un.h>
+#endif
+
#include "c-ctype.h"
#include "mgetgroups.h"
#include "virerror.h"
@@ -1978,6 +1982,47 @@ virGetListenFDs(void)
#endif /* WIN32 */
+#ifdef HAVE_SYS_UN_H
+char *virGetUNIXSocketPath(int fd)
+{
+ struct sockaddr_storage ss = { 0 };
+ struct sockaddr_un *un = (struct sockaddr_un *)&ss;
+ socklen_t len = sizeof(ss);
+ char *path;
+
+ if (getsockname(fd, (struct sockaddr *)&ss, &len) < 0) {
+ virReportSystemError(errno, _("Unable to get address of FD %d"), fd);
+ return NULL;
+ }
+
+ if (ss.ss_family != AF_UNIX) {
+ virReportSystemError(EINVAL, _("FD %d is not a UNIX socket, has
af=%d"),
+ fd, ss.ss_family);
+ return NULL;
+ }
+
+ if (un->sun_path[0] == '\0')
+ un->sun_path[0] = '@';
+
+ if (VIR_ALLOC_N(path, sizeof(un->sun_path) + 1) < 0)
+ return NULL;
+
+ memcpy(path, un->sun_path, sizeof(un->sun_path));
+ path[sizeof(un->sun_path)] = '\0';
+ return path;
+}
+
+#else /* HAVE_SYS_UN_H */
+
+char *virGetUNIXSocketPath(int fd)
+{
+ virReportSystemError(ENOSYS, "%s",
+ _("UNIX sockets not supported on this platform");
+ return NULL;
+}
+
+#endif /* HAVE_SYS_UN_H */
+
#ifndef WIN32
long virGetSystemPageSize(void)
{
diff --git a/src/util/virutil.h b/src/util/virutil.h
index 9381ad5682..be0f6b0ea8 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -207,6 +207,7 @@ verify((int)VIR_TRISTATE_BOOL_NO == (int)VIR_TRISTATE_SWITCH_OFF);
verify((int)VIR_TRISTATE_BOOL_ABSENT == (int)VIR_TRISTATE_SWITCH_ABSENT);
unsigned int virGetListenFDs(void);
+char *virGetUNIXSocketPath(int fd);
long virGetSystemPageSize(void) ATTRIBUTE_NOINLINE;
long virGetSystemPageSizeKB(void) ATTRIBUTE_NOINLINE;
--
2.14.3