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qio: add support for SO_PEERCRED for socket channel

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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 <aharivel@redhat.com>
Link: https://lore.kernel.org/r/20240522153453.1230389-2-aharivel@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Anthony Harivel 2024-05-22 17:34:50 +02:00 • committed by Paolo Bonzini
parent 13be929aff
commit 95fa0c79a0
3 changed files with 62 additions and 0 deletions
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21
include/io/channel.h
View file

@ -160,6 +160,9 @@ struct QIOChannelClass {
void *opaque);
int (*io_flush)(QIOChannel *ioc,
Error **errp);
int (*io_peerpid)(QIOChannel *ioc,
unsigned int *pid,
Error **errp);
};
/* General I/O handling functions */
@ -981,4 +984,22 @@ 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 -1 on error with pid -1 for the non-Linux OS.
*
*/
int qio_channel_get_peerpid(QIOChannel *ioc,
unsigned int *pid,
Error **errp);
#endif /* QIO_CHANNEL_H */