Hello guys, I'm writing a simple UNIX socket daemon and I want the daemon to be able to read the UID/GID/PID of the connecting process. Since this is defined in unix(7) I was expecting to find some easy way of doing it in perl. However I don't seam to find any examples on how I can implement it in Perl. Here is the most significant bit of my perl socket server: 
use constant SOCK_PATH => '/tmp/catsock';

socket(Server, AF_UNIX, SOCK_STREAM,0) or die "socket: $!";
setsockopt(Server, SOL_SOCKET, SO_PASSCRED, 1) or die "SO_PASSCRED: $!
+\n";
unlink(SOCK_PATH);
bind  (Server, sockaddr_un(SOCK_PATH)) or die "bind: $!";
listen(Server, SOMAXCONN) or die "listen: $!";

for ( $waitedpid = 0; accept(Client,Server) || $waitedpid; $waitedpid 
+= 0, close Client) {
    next if $waitedpid;
    my $n = unpack_sockaddr_un(getsockname(Client));
    logmsg 'peer: ' . $n . "\n" . <Client>;
}

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I wish to have something similar to this C function: 
int svc_recv(int fd, char *buffer, size_t size, struct ucred *cred) {
        char            control[1024];
        struct msghdr   msg;
        struct cmsghdr  *cmsg;
        struct iovec    iov;
        int             result;

        memset(&msg, 0, sizeof(msg));
        iov.iov_base = buffer;
        iov.iov_len = size;
        msg.msg_iov = &iov;
        msg.msg_iovlen = 1;
        msg.msg_control = control;
        msg.msg_controllen = sizeof(control);

        if (recvmsg(fd, &msg, 0) < 0)
                return -1;

        result = -1;
        cmsg = CMSG_FIRSTHDR(&msg);
        while (cmsg != NULL) {
                if (cmsg->cmsg_level == SOL_SOCKET
                 && cmsg->cmsg_type  == SCM_CREDENTIALS) {
                        memcpy(cred, CMSG_DATA(cmsg), sizeof(*cred));
                        result = iov.iov_len;
                } else
                if (cmsg->cmsg_level == SOL_SOCKET
                 && cmsg->cmsg_type  == SCM_RIGHTS) {
                        dispose_fds((int *) CMSG_DATA(cmsg),
                                (cmsg->cmsg_len - CMSG_LEN(0))/sizeof(
+int));
                }
                cmsg = CMSG_NXTHDR(&msg, cmsg);
        }

        return result;
}

[download]
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In reply to How to read UNIX socket credentials? by hackman

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