/*
	 * Copyright 2010-2024 Red Hat, Inc.
	 *
	 * Author: Angus Salkeld <asalkeld@redhat.com>
	 *
	 * This file is part of libqb.
	 *
	 * libqb is free software: you can redistribute it and/or modify
	 * it under the terms of the GNU Lesser General Public License as published by
	 * the Free Software Foundation, either version 2.1 of the License, or
	 * (at your option) any later version.
	 *
	 * libqb is distributed in the hope that it will be useful,
	 * but WITHOUT ANY WARRANTY; without even the implied warranty of
	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	 * GNU Lesser General Public License for more details.
	 *
	 * You should have received a copy of the GNU Lesser General Public License
	 * along with libqb.  If not, see <http://www.gnu.org/licenses/>.
	 */
	#include "os_base.h"
	#include <poll.h>
	
	#if defined(HAVE_GETPEERUCRED)
	#include <ucred.h>
	#endif
	
	#ifdef HAVE_SYS_UN_H
	#include <sys/un.h>
	#endif /* HAVE_SYS_UN_H */
	#ifdef HAVE_SYS_STAT_H
	#include <sys/stat.h>
	#endif
	#ifdef HAVE_SYS_MMAN_H
	#include <sys/mman.h>
	#endif
	
	#include <qb/qbatomic.h>
	#include <qb/qbipcs.h>
	#include <qb/qbloop.h>
	#include <qb/qbdefs.h>
	
	#include "util_int.h"
	#include "ipc_int.h"
	
	struct ipc_auth_ugp {
		uid_t uid;
		gid_t gid;
		pid_t pid;
	};
	
	struct ipc_auth_data {
		int32_t sock;
		struct qb_ipcs_service *s;
		union {
			struct qb_ipc_connection_request req;
			struct qb_ipc_connection_response res;
		} msg;
		struct msghdr msg_recv;
		struct iovec iov_recv;
		struct ipc_auth_ugp ugp;
	
		size_t processed;
		size_t len;
	
	#ifdef SO_PASSCRED
		char *cmsg_cred;
	#endif
	
	};
	
	static int32_t qb_ipcs_us_connection_acceptor(int fd, int revent, void *data);
	
	ssize_t
	qb_ipc_us_send(struct qb_ipc_one_way *one_way, const void *msg, size_t len)
	{
		int32_t result;
		int32_t processed = 0;
		char *rbuf = (char *)msg;
	
		qb_sigpipe_ctl(QB_SIGPIPE_IGNORE);
	

	retry_send:

		result = send(one_way->u.us.sock,
			      &rbuf[processed], len - processed, MSG_NOSIGNAL);
	

		if (result == -1) {

			if (errno == EAGAIN && processed > 0) {

				goto retry_send;
			} else {
				qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
				return -errno;
			}

		}
	

		processed += result;

		if (processed != len) {

			goto retry_send;

		}
	
		qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
	

		return processed;
	}
	
	static ssize_t
	qb_ipc_us_recv_msghdr(struct ipc_auth_data *data)
	{
		char *msg = (char *) &data->msg;
		int32_t result;
	
		qb_sigpipe_ctl(QB_SIGPIPE_IGNORE);
	
	retry_recv:
		data->msg_recv.msg_iov->iov_base = &msg[data->processed];
		data->msg_recv.msg_iov->iov_len = data->len - data->processed;
	
		result = recvmsg(data->sock, &data->msg_recv, MSG_NOSIGNAL | MSG_WAITALL);
		if (result == -1 && errno == EAGAIN) {
			qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
			return -EAGAIN;
		}
		if (result == -1) {
			qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
			return -errno;
		}
		if (result == 0) {
			qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
			qb_util_log(LOG_DEBUG,
				    "recv(fd %d) got 0 bytes assuming ENOTCONN", data->sock);
			return -ENOTCONN;
		}
	
		data->processed += result;
		if (data->processed != data->len) {
			goto retry_recv;
		}
		qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
		assert(data->processed == data->len);
	
		return data->processed;
	}
	
	int32_t
	qb_ipc_us_sock_error_is_disconnected(int err)
	{
		if (err >= 0) {
			return QB_FALSE;
		} else if (err == -EAGAIN ||
		    err == -ETIMEDOUT ||
		    err == -EINTR ||
	#ifdef EWOULDBLOCK
		    err == -EWOULDBLOCK ||
	#endif
		    err == -EMSGSIZE ||
		    err == -ENOMSG ||
		    err == -EINVAL) {
			return QB_FALSE;
		}
		return QB_TRUE;
	}
	
	int32_t
	qb_ipc_us_ready(struct qb_ipc_one_way * ow_data,
			struct qb_ipc_one_way * ow_conn,
			int32_t ms_timeout, int32_t events)
	{
		struct pollfd ufds[2];
		int32_t poll_events;
		int numfds = 1;
		int i;
	
		ufds[0].fd = ow_data->u.us.sock;
		ufds[0].events = events;
		ufds[0].revents = 0;
	
		if (ow_conn && ow_data != ow_conn) {
			numfds++;
			ufds[1].fd = ow_conn->u.us.sock;
			ufds[1].events = POLLIN;
			ufds[1].revents = 0;
		}
		poll_events = poll(ufds, numfds, ms_timeout);
		if ((poll_events == -1 && errno == EINTR) || poll_events == 0) {
			return -EAGAIN;
		} else if (poll_events == -1) {
			return -errno;
		}
		for (i = 0; i < poll_events; i++) {
			if (ufds[i].revents & POLLERR) {
				qb_util_log(LOG_DEBUG, "poll(fd %d) got POLLERR",
					    ufds[i].fd);
				return -ENOTCONN;
			} else if (ufds[i].revents & POLLHUP) {
				qb_util_log(LOG_DEBUG, "poll(fd %d) got POLLHUP",
					    ufds[i].fd);
				return -ENOTCONN;
			} else if (ufds[i].revents & POLLNVAL) {
				qb_util_log(LOG_DEBUG, "poll(fd %d) got POLLNVAL",
					    ufds[i].fd);
				return -ENOTCONN;
			} else if (ufds[i].revents == 0) {
				qb_util_log(LOG_DEBUG, "poll(fd %d) zero revents",
					    ufds[i].fd);
				return -ENOTCONN;
			}
		}
		return 0;
	}
	
	/*
	 * recv an entire message - and try hard to get all of it.
	 */
	ssize_t
	qb_ipc_us_recv(struct qb_ipc_one_way * one_way,
		       void *msg, size_t len, int32_t timeout)
	{
		int32_t result;
		int32_t final_rc = 0;
		int32_t processed = 0;
		int32_t to_recv = len;
		char *data = msg;
	
		qb_sigpipe_ctl(QB_SIGPIPE_IGNORE);
	
	retry_recv:
		result = recv(one_way->u.us.sock, &data[processed], to_recv,
			      MSG_NOSIGNAL | MSG_WAITALL);
	
		if (result == -1) {
			if (errno == EAGAIN && (processed > 0 || timeout == -1)) {
				result = qb_ipc_us_ready(one_way, NULL, timeout, POLLIN);
				if (result == 0 || result == -EAGAIN) {
					goto retry_recv;
				}
				final_rc = result;
				goto cleanup_sigpipe;
			} else if (errno == ECONNRESET || errno == EPIPE) {
				final_rc = -ENOTCONN;
				goto cleanup_sigpipe;
			} else {
				final_rc = -errno;
				goto cleanup_sigpipe;
			}
		}
	
		if (result == 0) {
			final_rc = -ENOTCONN;
			goto cleanup_sigpipe;
		}
		processed += result;
		to_recv -= result;
		if (processed != len) {
			goto retry_recv;
		}
		final_rc = processed;
	
	cleanup_sigpipe:
		qb_sigpipe_ctl(QB_SIGPIPE_DEFAULT);
		return final_rc;
	}
	
	static int32_t
	qb_ipcc_stream_sock_connect(const char *socket_name, int32_t * sock_pt)
	{
		int32_t request_fd;
		struct sockaddr_un address;
		int32_t res = 0;
	
		request_fd = socket(PF_UNIX, SOCK_STREAM, 0);
		if (request_fd == -1) {
			return -errno;
		}
	
		qb_socket_nosigpipe(request_fd);
	
		res = qb_sys_fd_nonblock_cloexec_set(request_fd);
		if (res < 0) {
			goto error_connect;
		}
	
		memset(&address, 0, sizeof(struct sockaddr_un));
		address.sun_family = AF_UNIX;
	#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
		address.sun_len = QB_SUN_LEN(&address);
	#endif
	
		if (!use_filesystem_sockets()) {
			snprintf(address.sun_path + 1, UNIX_PATH_MAX - 1, "%s", socket_name);
		} else {
			snprintf(address.sun_path, sizeof(address.sun_path), "%s/%s", SOCKETDIR,
				 socket_name);
		}
	
		if (connect(request_fd, (struct sockaddr *)&address,
			    QB_SUN_LEN(&address)) == -1) {
			res = -errno;
			goto error_connect;
		}
	
		*sock_pt = request_fd;
		return 0;
	
	error_connect:
		close(request_fd);
		*sock_pt = -1;
	
		return res;
	}
	
	void
	qb_ipcc_us_sock_close(int32_t sock)
	{
		shutdown(sock, SHUT_RDWR);
		close(sock);
	}
	
	static int32_t
	qb_ipc_auth_creds(struct ipc_auth_data *data)
	{
		int32_t res = 0;
	
		/*
		 * currently support getpeerucred, getpeereid, and SO_PASSCRED credential
		 * retrieval mechanisms for various Platforms
		 */
	#ifdef HAVE_GETPEERUCRED
		/*
		 * Solaris and some BSD systems
		 */
		{
			ucred_t *uc = NULL;
	
			if (getpeerucred(data->sock, &uc) == 0) {
				res = 0;
				data->ugp.uid = ucred_geteuid(uc);
				data->ugp.gid = ucred_getegid(uc);
				data->ugp.pid = ucred_getpid(uc);
				ucred_free(uc);
			} else {
				res = -errno;
			}
		}
	#elif defined(HAVE_GETPEEREID)
		/*
		* Usually MacOSX systems
		*/
		{
			/*
			* TODO get the peer's pid.
			* c->pid = ?;
			*/
			if (getpeereid(data->sock, &data->ugp.uid, &data->ugp.gid) == 0) {
				res = 0;
			} else {
				res = -errno;
			}
		}
	
	#elif defined(SO_PASSCRED)
		/*
		* Usually Linux systems
		*/
		{
			struct ucred cred;
			struct cmsghdr *cmsg;
	
			res = -EINVAL;
			for (cmsg = CMSG_FIRSTHDR(&data->msg_recv); cmsg != NULL;
				cmsg = CMSG_NXTHDR(&data->msg_recv, cmsg)) {
				if (cmsg->cmsg_type != SCM_CREDENTIALS)
					continue;
	
				memcpy(&cred, CMSG_DATA(cmsg), sizeof(struct ucred));
				res = 0;
				data->ugp.pid = cred.pid;
				data->ugp.uid = cred.uid;
				data->ugp.gid = cred.gid;
				break;
			}
		}
	#else /* no credentials */
		data->ugp.pid = 0;
		data->ugp.uid = 0;
		data->ugp.gid = 0;
		res = -ENOTSUP;
	#endif /* no credentials */
	
		return res;
	}
	
	static void
	destroy_ipc_auth_data(struct ipc_auth_data *data)
	{
		if (data->s) {
			qb_ipcs_unref(data->s);
		}
	
	#ifdef SO_PASSCRED
		free(data->cmsg_cred);
	#endif
		free(data);
	}
	
	static struct ipc_auth_data *
	init_ipc_auth_data(int sock, size_t len)
	{
		struct ipc_auth_data *data = calloc(1, sizeof(struct ipc_auth_data));
	
		if (data == NULL) {
			return NULL;
		}
	
		data->msg_recv.msg_iov = &data->iov_recv;
		data->msg_recv.msg_iovlen = 1;
		data->msg_recv.msg_name = 0;
		data->msg_recv.msg_namelen = 0;
	
	#ifdef SO_PASSCRED
		data->cmsg_cred = calloc(1, CMSG_SPACE(sizeof(struct ucred)));
		if (data->cmsg_cred == NULL) {
			destroy_ipc_auth_data(data);
			return NULL;
		}
		data->msg_recv.msg_control = (void *)data->cmsg_cred;
		data->msg_recv.msg_controllen = CMSG_SPACE(sizeof(struct ucred));
	#endif
	#if defined(QB_SOLARIS) && !defined(_XPG4_2)
		data->msg_recv.msg_accrights = 0;
		data->msg_recv.msg_accrightslen = 0;
	#else
		data->msg_recv.msg_flags = 0;
	#endif /* QB_SOLARIS */
	
		data->len = len;
		data->iov_recv.iov_base = (void *)&data->msg;
		data->iov_recv.iov_len = data->len;
		data->sock = sock;
	
		return data;
	}
	
	int32_t
	qb_ipcc_us_setup_connect(struct qb_ipcc_connection *c,
				 struct qb_ipc_connection_response *r)
	{
		int32_t res;
		struct qb_ipc_connection_request request;
	#ifdef QB_LINUX
		int on = 1;
	#endif
	
		res = qb_ipcc_stream_sock_connect(c->name, &c->setup.u.us.sock);
		if (res != 0) {
			return res;
		}
	#ifdef QB_LINUX
		res = setsockopt(c->setup.u.us.sock, SOL_SOCKET, SO_PASSCRED, &on,
				 sizeof(on));
		if (res != 0) {
			int err = errno;
			qb_ipcc_us_sock_close(c->setup.u.us.sock);
			errno = err;
			return res;
		}
	#endif
	
		memset(&request, 0, sizeof(request));
		request.hdr.id = QB_IPC_MSG_AUTHENTICATE;
		request.hdr.size = sizeof(request);
		request.max_msg_size = c->setup.max_msg_size;
		res = qb_ipc_us_send(&c->setup, &request, request.hdr.size);
		if (res < 0) {
			qb_ipcc_us_sock_close(c->setup.u.us.sock);
			return res;
		}
	
		/* ... To be continued ... (when the FD is active) */
		return 0;
	}
	
	#define AUTH_RECV_MAX_RETRIES 10
	#define AUTH_RECV_SLEEP_TIME_US 100
	
	/* Called from ipcc_connect_continue() when async connect socket is active */
	int qb_ipcc_setup_connect_continue(struct qb_ipcc_connection *c, struct qb_ipc_connection_response *r)
	{
		struct ipc_auth_data *data;
		int32_t res;
		int res1;
		int retry_count = 0;
	#ifdef QB_LINUX
		int off = 0;
	#endif
		data = init_ipc_auth_data(c->setup.u.us.sock, sizeof(struct qb_ipc_connection_response));
		if (data == NULL) {
			qb_ipcc_us_sock_close(c->setup.u.us.sock);
			return -ENOMEM;
		}
	retry:
		res = qb_ipc_us_recv_msghdr(data);
		if (res == -EAGAIN && ++retry_count < AUTH_RECV_MAX_RETRIES) {
			struct timespec ts = {0,  AUTH_RECV_SLEEP_TIME_US*QB_TIME_NS_IN_USEC};
			struct timespec ts_left = {0, 0};
			nanosleep(&ts, &ts_left);
			goto retry;
		}
	
	#ifdef QB_LINUX
		res1 = setsockopt(c->setup.u.us.sock, SOL_SOCKET, SO_PASSCRED, &off,
				 sizeof(off));
		if (res1 != 0) {
			int err = errno;
			destroy_ipc_auth_data(data);
			errno = err;
			return res;
		}
	#endif
	
		if (res != data->len) {
			destroy_ipc_auth_data(data);
			return res;
		}
	
		memcpy(r, &data->msg.res, sizeof(struct qb_ipc_connection_response));
	
		qb_ipc_auth_creds(data);
		c->egid = data->ugp.gid;
		c->euid = data->ugp.uid;
		c->server_pid = data->ugp.pid;
	
		destroy_ipc_auth_data(data);
	
		return r->hdr.error;
	}
	
	/*
	 **************************************************************************
	 * SERVER
	 */
	
	int32_t
	qb_ipcs_us_publish(struct qb_ipcs_service * s)
	{
		struct sockaddr_un un_addr;
		int32_t res;
	#ifdef SO_PASSCRED
		int on = 1;
	#endif
	
		/*
		 * Create socket for IPC clients, name socket, listen for connections
		 */
		s->server_sock = socket(PF_UNIX, SOCK_STREAM, 0);
		if (s->server_sock == -1) {
			res = -errno;
			qb_util_perror(LOG_ERR, "Cannot create server socket");
			return res;
		}
	
		res = qb_sys_fd_nonblock_cloexec_set(s->server_sock);
		if (res < 0) {
			goto error_close;
		}
	
		memset(&un_addr, 0, sizeof(struct sockaddr_un));
		un_addr.sun_family = AF_UNIX;
	#if defined(QB_BSD) || defined(QB_DARWIN)
		un_addr.sun_len = SUN_LEN(&un_addr);
	#endif
	
		qb_util_log(LOG_INFO, "server name: %s", s->name);
	
		if (!use_filesystem_sockets()) {
			snprintf(un_addr.sun_path + 1, UNIX_PATH_MAX - 1, "%s", s->name);
		}
		else {
			struct stat stat_out;
			res = stat(SOCKETDIR, &stat_out);
			if (res == -1 || (res == 0 && !S_ISDIR(stat_out.st_mode))) {
				res = -errno;
				qb_util_log(LOG_CRIT,
					    "Required directory not present %s",
					    SOCKETDIR);
				goto error_close;
			}
			snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/%s", SOCKETDIR,
				 s->name);
			unlink(un_addr.sun_path);
		}
	
		res = bind(s->server_sock, (struct sockaddr *)&un_addr,
			   QB_SUN_LEN(&un_addr));
		if (res) {
			res = -errno;
			qb_util_perror(LOG_ERR, "Could not bind AF_UNIX (%s)",
				       un_addr.sun_path);
			goto error_close;
	        }
	
		/*
		 * Allow everyone to write to the socket since the IPC layer handles
		 * security automatically
		 */
		if (use_filesystem_sockets()) {
		        (void)chmod(un_addr.sun_path, S_IRWXU | S_IRWXG | S_IRWXO);
	        }
	#ifdef SO_PASSCRED
		(void)setsockopt(s->server_sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
	#endif
		if (listen(s->server_sock, SERVER_BACKLOG) == -1) {
			qb_util_perror(LOG_ERR, "socket listen failed");
		}
	
		res = s->poll_fns.dispatch_add(s->poll_priority, s->server_sock,
					       POLLIN | POLLPRI | POLLNVAL,
					       s, qb_ipcs_us_connection_acceptor);
		return res;
	
	error_close:
		close(s->server_sock);
		return res;
	}
	
	int32_t
	qb_ipcs_us_withdraw(struct qb_ipcs_service * s)
	{
		qb_util_log(LOG_INFO, "withdrawing server sockets");
		(void)s->poll_fns.dispatch_del(s->server_sock);
		shutdown(s->server_sock, SHUT_RDWR);
	
		if (use_filesystem_sockets()) {
			struct sockaddr_un sockname;
			socklen_t socklen = sizeof(sockname);
			if ((getsockname(s->server_sock, (struct sockaddr *)&sockname, &socklen) == 0) &&
			    sockname.sun_family == AF_UNIX) {
	#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
				/*
				 * Terminating NUL on FreeBSD is not part of the sun_path.
				 * Add it to use sun_path as a parameter of unlink
				 */
				sockname.sun_path[sockname.sun_len - offsetof(struct sockaddr_un, sun_path)] = '\0';
	#endif
				unlink(sockname.sun_path);
			}
		}
	
		close(s->server_sock);
		s->server_sock = -1;
		return 0;
	}
	
	static int32_t
	handle_new_connection(struct qb_ipcs_service *s,
			      int32_t auth_result,
			      int32_t sock,
			      void *msg, size_t len, struct ipc_auth_ugp *ugp)
	{
		struct qb_ipcs_connection *c = NULL;
		struct qb_ipc_connection_request *req = msg;
		int32_t res = auth_result;
		int32_t res2 = 0;
		uint32_t max_buffer_size = QB_MAX(req->max_msg_size, s->max_buffer_size);
		struct qb_ipc_connection_response response;
		const char suffix[] = "/qb";
		int desc_len;
	
		c = qb_ipcs_connection_alloc(s);
		if (c == NULL) {
			qb_ipcc_us_sock_close(sock);
			return -ENOMEM;
		}
	
		c->receive_buf = calloc(1, max_buffer_size);
		if (c->receive_buf == NULL) {
			free(c);
			qb_ipcc_us_sock_close(sock);
			return -ENOMEM;
		}
		c->setup.u.us.sock = sock;
		c->request.max_msg_size = max_buffer_size;
		c->response.max_msg_size = max_buffer_size;
		c->event.max_msg_size = max_buffer_size;
		c->pid = ugp->pid;
		c->auth.uid = c->euid = ugp->uid;
		c->auth.gid = c->egid = ugp->gid;
		c->auth.mode = 0600;
		c->stats.client_pid = ugp->pid;
	
		memset(&response, 0, sizeof(response));
	
	#if defined(QB_LINUX) || defined(QB_CYGWIN)
		desc_len = snprintf(c->description, CONNECTION_DESCRIPTION - sizeof suffix,
				    "/dev/shm/qb-%d-%d-%d-XXXXXX", s->pid, ugp->pid, c->setup.u.us.sock);
		if (desc_len < 0) {
			res = -errno;
			goto send_response;
		}
		if (desc_len >= CONNECTION_DESCRIPTION - sizeof suffix) {
			res = -ENAMETOOLONG;
			goto send_response;
		}
		if (mkdtemp(c->description) == NULL) {
			res = -errno;
			goto send_response;
		}
		if (chmod(c->description, 0770)) {
			res = -errno;
			goto send_response;
		}
		/* chown can fail because we might not be root */
		(void)chown(c->description, c->auth.uid, c->auth.gid);
	
		/* We can't pass just a directory spec to the clients */
		memcpy(c->description + desc_len, suffix, sizeof suffix);
	#else
		desc_len = snprintf(c->description, CONNECTION_DESCRIPTION,
				    "%d-%d-%d", s->pid, ugp->pid, c->setup.u.us.sock);
		if (desc_len < 0) {
			res = -errno;
			goto send_response;
		}
		if (desc_len >= CONNECTION_DESCRIPTION) {
			res = -ENAMETOOLONG;
			goto send_response;
		}
	#endif
	
	
	
		if (auth_result == 0 && c->service->serv_fns.connection_accept) {
			res = c->service->serv_fns.connection_accept(c,
								     c->euid, c->egid);
		}
		if (res != 0) {
			goto send_response;
		}
	
		qb_util_log(LOG_DEBUG, "IPC credentials authenticated (%s)",
			    c->description);
	
		if (s->funcs.connect) {
			res = s->funcs.connect(s, c, &response);
			if (res != 0) {
				goto send_response;
			}
		}
		/*
		 * The connection is good, add it to the active connection list
		 */
		c->state = QB_IPCS_CONNECTION_ACTIVE;
		qb_list_add(&c->list, &s->connections);
	
	send_response:
		response.hdr.id = QB_IPC_MSG_AUTHENTICATE;
		response.hdr.size = sizeof(response);
		response.hdr.error = res;
		if (res == 0) {
			response.connection = (intptr_t) c;
			response.connection_type = s->type;
			response.max_msg_size = c->request.max_msg_size;
			s->stats.active_connections++;
		}
	
		res2 = qb_ipc_us_send(&c->setup, &response, response.hdr.size);
		if (res == 0 && res2 != response.hdr.size) {
			res = res2;
		}
	
		if (res == 0) {
			qb_ipcs_connection_ref(c);
			if (s->serv_fns.connection_created) {
				s->serv_fns.connection_created(c);
			}
			if (c->state == QB_IPCS_CONNECTION_ACTIVE) {
				c->state = QB_IPCS_CONNECTION_ESTABLISHED;
			}
			qb_ipcs_connection_unref(c);
		} else {
			if (res == -EACCES) {
				qb_util_log(LOG_INFO, "IPC connection credentials rejected (%s)",
					    c->description);
			} else if (res == -EAGAIN) {
				qb_util_log(LOG_INFO, "IPC connection not ready (%s)",
					    c->description);
			} else {
				qb_util_perror(LOG_INFO, "IPC connection setup failed (%s)",
					       c->description);
				errno = -res;
			}
	
			if (c->state == QB_IPCS_CONNECTION_INACTIVE) {
				/* This removes the initial alloc ref */
				qb_ipcs_connection_unref(c);
			        qb_ipcc_us_sock_close(sock);
			} else {
				qb_ipcs_disconnect(c);
			}
		}
		return res;
	}
	
	static int32_t
	process_auth(int32_t fd, int32_t revents, void *d)
	{
		struct ipc_auth_data *data = (struct ipc_auth_data *) d;
	
		int32_t res = 0;
		int res1;
	#ifdef SO_PASSCRED
		int off = 0;
	#endif
	
		if (data->s->server_sock == -1) {
			qb_util_log(LOG_DEBUG, "Closing fd (%d) for server shutdown", fd);
			res = -ESHUTDOWN;
			goto cleanup_and_return;
		}
	
		if (revents & POLLNVAL) {
			qb_util_log(LOG_DEBUG, "NVAL conn fd (%d)", fd);
			res = -EINVAL;
			goto cleanup_and_return;
		}
		if (revents & POLLHUP) {
			qb_util_log(LOG_DEBUG, "HUP conn fd (%d)", fd);
			res = -ESHUTDOWN;
			goto cleanup_and_return;
		}
		if ((revents & POLLIN) == 0) {
			return 0;
		}
	
		res = qb_ipc_us_recv_msghdr(data);
		if (res == -EAGAIN) {
			/* yield to mainloop, Let mainloop call us again */
			return 0;
		}
	
		if (res != data->len) {
			res = -EIO;
			goto cleanup_and_return;
		}
	
		res = qb_ipc_auth_creds(data);
	
	cleanup_and_return:
	#ifdef SO_PASSCRED
		res1 = setsockopt(data->sock, SOL_SOCKET, SO_PASSCRED, &off, sizeof(off));
		if (res1 != 0) {
			int err = errno;
			close(data->sock);
			errno = err;
			return res;
		}
	#endif
	
		(void)data->s->poll_fns.dispatch_del(data->sock);
	
		if (res < 0) {
			close(data->sock);
		} else if (data->msg.req.hdr.id == QB_IPC_MSG_AUTHENTICATE) {
			(void)handle_new_connection(data->s, res, data->sock, &data->msg, data->len, &data->ugp);
		} else {
			close(data->sock);
		}
		destroy_ipc_auth_data(data);
	
		return 1;
	}
	
	static void
	qb_ipcs_uc_recv_and_auth(int32_t sock, struct qb_ipcs_service *s)
	{
		int res = 0;
		int res1;
		struct ipc_auth_data *data = NULL;
	#ifdef SO_PASSCRED
		int on = 1;
	#endif
	
		data = init_ipc_auth_data(sock, sizeof(struct qb_ipc_connection_request));
		if (data == NULL) {
			close(sock);
			/* -ENOMEM */
			return;
		}
	
		data->s = s;
		qb_ipcs_ref(data->s);
	
	#ifdef SO_PASSCRED
		res1 = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
		if (res1 != 0) {
			close(sock);
			return;
		}
	#endif
	
		res = s->poll_fns.dispatch_add(s->poll_priority,
		                               data->sock,
		                               POLLIN | POLLPRI | POLLNVAL,
		                               data, process_auth);
		if (res < 0) {
			qb_util_log(LOG_DEBUG, "Failed to arrange for AUTH for fd (%d)",
			            data->sock);
			close(sock);
			destroy_ipc_auth_data(data);
		}
	}
	
	static int32_t
	qb_ipcs_us_connection_acceptor(int fd, int revent, void *data)
	{
		struct sockaddr_un un_addr;
		int32_t new_fd;
		struct qb_ipcs_service *s = (struct qb_ipcs_service *)data;
		int32_t res;
		socklen_t addrlen = sizeof(struct sockaddr_un);
	
		if (revent & (POLLNVAL | POLLHUP | POLLERR)) {
			/*
			 * handle shutdown more cleanly.
			 */
			return -1;
		}
	
	retry_accept:
		errno = 0;
		new_fd = accept(fd, (struct sockaddr *)&un_addr, &addrlen);
		if (new_fd == -1 && errno == EINTR) {
			goto retry_accept;
		}
	
		if (new_fd == -1 && errno == EBADF) {
			qb_util_perror(LOG_ERR,
				       "Could not accept client connection from fd:%d",
				       fd);
			return -1;
		}
		if (new_fd == -1) {
			qb_util_perror(LOG_ERR, "Could not accept client connection");
			/* This is an error, but -1 would indicate disconnect
			 * from the poll loop
			 */
			return 0;
		}
	
		res = qb_sys_fd_nonblock_cloexec_set(new_fd);
		if (res < 0) {
			close(new_fd);
			/* This is an error, but -1 would indicate disconnect
			 * from the poll loop
			 */
			return 0;
		}
	
		qb_ipcs_uc_recv_and_auth(new_fd, s);
		return 0;
	}
	
	void remove_tempdir(const char *name)
	{
	#if defined(QB_LINUX) || defined(QB_CYGWIN)
		char dirname[PATH_MAX];
		char *slash = strrchr(name, '/');
	
		if (slash && slash - name < sizeof dirname) {
			memcpy(dirname, name, slash - name);
			dirname[slash - name] = '\0';
			/* This gets called more than it needs to be really, so we don't check
			 * the return code. It's more of a desperate attempt to clean up after ourself
			 * in either the server or client.
			 */
			(void)rmdir(dirname);
		}
	#endif
	}