The function qio_channel_get_peercred() returns a pointer to the
credentials of the peer process connected to this socket.
This credentials structure is defined in <sys/socket.h> as follows:
struct ucred {
pid_t pid; /* Process ID of the sending process */
uid_t uid; /* User ID of the sending process */
gid_t gid; /* Group ID of the sending process */
};
The use of this function is possible only for connected AF_UNIX stream
sockets and for AF_UNIX stream and datagram socket pairs.
On platform other than Linux, the function return 0.
Signed-off-by: Anthony Harivel <ahari...@redhat.com>
---
include/io/channel.h | 21 +++++++++++++++++++++
io/channel-socket.c | 23 +++++++++++++++++++++++
io/channel.c | 12 ++++++++++++
3 files changed, 56 insertions(+)
diff --git a/include/io/channel.h b/include/io/channel.h
index 5f9dbaab65b0..0413435ce011 100644
--- a/include/io/channel.h
+++ b/include/io/channel.h
@@ -149,6 +149,9 @@ struct QIOChannelClass {
void *opaque);
int (*io_flush)(QIOChannel *ioc,
Error **errp);
+ void (*io_peerpid)(QIOChannel *ioc,
+ unsigned int *pid,
+ Error **errp);
};
/* General I/O handling functions */
@@ -898,4 +901,22 @@ int coroutine_mixed_fn
qio_channel_writev_full_all(QIOChannel *ioc,
int qio_channel_flush(QIOChannel *ioc,
Error **errp);
+/**
+ * qio_channel_get_peercred:
+ * @ioc: the channel object
+ * @pid: pointer to pid
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Returns the pid of the peer process connected to this socket.
+ *
+ * The use of this function is possible only for connected
+ * AF_UNIX stream sockets and for AF_UNIX stream and datagram
+ * socket pairs on Linux.
+ * Return 0 for the non-Linux OS.
+ *
+ */
+void qio_channel_get_peerpid(QIOChannel *ioc,
+ unsigned int *pid,
+ Error **errp);
+
#endif /* QIO_CHANNEL_H */
diff --git a/io/channel-socket.c b/io/channel-socket.c
index 3a899b060858..e6a73592650c 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -841,6 +841,28 @@ qio_channel_socket_set_cork(QIOChannel *ioc,
socket_set_cork(sioc->fd, v);
}
+static void
+qio_channel_socket_get_peerpid(QIOChannel *ioc,
+ unsigned int *pid,
+ Error **errp)
+{
+#ifdef CONFIG_LINUX
+ QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+ Error *err = NULL;
+ socklen_t len = sizeof(struct ucred);
+
+ struct ucred cred;
+ if (getsockopt(sioc->fd,
+ SOL_SOCKET, SO_PEERCRED,
+ &cred, &len) == -1) {
+ error_setg_errno(&err, errno, "Unable to get peer credentials");
+ error_propagate(errp, err);
+ }
+ *pid = (unsigned int)cred.pid;
+#else
+ *pid = 0;
+#endif
+}
static int
qio_channel_socket_close(QIOChannel *ioc,
@@ -938,6 +960,7 @@ static void qio_channel_socket_class_init(ObjectClass
*klass,
#ifdef QEMU_MSG_ZEROCOPY
ioc_klass->io_flush = qio_channel_socket_flush;
#endif
+ ioc_klass->io_peerpid = qio_channel_socket_get_peerpid;
}
static const TypeInfo qio_channel_socket_info = {
diff --git a/io/channel.c b/io/channel.c
index 86c5834510ff..a5646650cf72 100644
--- a/io/channel.c
+++ b/io/channel.c
@@ -490,6 +490,18 @@ void qio_channel_set_cork(QIOChannel *ioc,
}
}
+void qio_channel_get_peerpid(QIOChannel *ioc,
+ unsigned int *pid,
+ Error **errp)
+{
+ QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
+
+ if (!klass->io_peerpid) {
+ error_setg(errp, "Channel does not support peer pid");
+ return;
+ }
+ klass->io_peerpid(ioc, pid, errp);
+}
off_t qio_channel_io_seek(QIOChannel *ioc,
off_t offset,
--
2.43.0
