weston-launch starts weston and provides mechanism for weston to set/drop drm master, open a tty, and read input devices without being root. Execution is allowed for local-active sessions or users in the group weston-launch.dev
Benjamin Franzke
13 years ago
parent
1a36156972
commit
bfeda130de
@ -0,0 +1,156 @@ |
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/*
|
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* Copyright © 2012 Benjamin Franzke |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and |
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* its documentation for any purpose is hereby granted without fee, provided |
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* that the above copyright notice appear in all copies and that both that |
||||
* copyright notice and this permission notice appear in supporting |
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* documentation, and that the name of the copyright holders not be used in |
||||
* advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. The copyright holders make |
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* no representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF |
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <sys/socket.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/uio.h> |
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#include <fcntl.h> |
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#include <xf86drm.h> |
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#include "compositor.h" |
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#include "launcher-util.h" |
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#include "weston-launch.h" |
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int |
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weston_launcher_open(struct weston_compositor *compositor, |
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const char *path, int flags) |
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{ |
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int sock = compositor->launcher_sock; |
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int fd, n, ret = -1; |
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struct msghdr msg; |
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struct cmsghdr *cmsg; |
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struct iovec iov; |
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char control[CMSG_SPACE(sizeof fd)]; |
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ssize_t len; |
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struct weston_launcher_open *message; |
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if (sock == -1) |
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return open(path, flags); |
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n = sizeof(*message) + strlen(path) + 1; |
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message = malloc(n); |
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if (!message) |
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return -1; |
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message->header.opcode = WESTON_LAUNCHER_OPEN; |
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message->flags = flags; |
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strcpy(message->path, path); |
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do { |
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len = send(sock, message, n, 0); |
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} while (len < 0 && errno == EINTR); |
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memset(&msg, 0, sizeof msg); |
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iov.iov_base = &ret; |
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iov.iov_len = sizeof ret; |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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msg.msg_control = control; |
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msg.msg_controllen = sizeof control; |
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do { |
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len = recvmsg(sock, &msg, MSG_CMSG_CLOEXEC); |
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} while (len < 0 && errno == EINTR); |
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if (len != sizeof ret || |
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ret < 0) |
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goto out; |
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cmsg = CMSG_FIRSTHDR(&msg); |
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if (!cmsg || |
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cmsg->cmsg_level != SOL_SOCKET || |
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cmsg->cmsg_type != SCM_RIGHTS) { |
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fprintf(stderr, "invalid control message\n"); |
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goto out; |
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} |
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fd = *(int *) CMSG_DATA(cmsg); |
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if (fd == -1) { |
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fprintf(stderr, "missing drm fd in socket request"); |
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return -1; |
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} |
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out: |
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free(message); |
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return ret < 0 ? ret : fd; |
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} |
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int |
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weston_launcher_drm_set_master(struct weston_compositor *compositor, |
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int drm_fd, char master) |
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{ |
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struct msghdr msg; |
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struct cmsghdr *cmsg; |
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struct iovec iov; |
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char control[CMSG_SPACE(sizeof(drm_fd))]; |
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int ret; |
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ssize_t len; |
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struct weston_launcher_set_master message; |
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if (compositor->launcher_sock == -1) { |
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if (master) |
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return drmSetMaster(drm_fd); |
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else |
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return drmDropMaster(drm_fd); |
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} |
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memset(&msg, 0, sizeof msg); |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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msg.msg_control = control; |
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msg.msg_controllen = sizeof control; |
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cmsg = CMSG_FIRSTHDR(&msg); |
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cmsg->cmsg_level = SOL_SOCKET; |
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cmsg->cmsg_type = SCM_RIGHTS; |
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cmsg->cmsg_len = CMSG_LEN(sizeof(drm_fd)); |
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*(int *) CMSG_DATA(cmsg) = drm_fd; |
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msg.msg_controllen = cmsg->cmsg_len; |
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iov.iov_base = &message; |
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iov.iov_len = sizeof message; |
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message.header.opcode = WESTON_LAUNCHER_DRM_SET_MASTER; |
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message.set_master = master; |
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do { |
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len = sendmsg(compositor->launcher_sock, &msg, 0); |
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} while (len < 0 && errno == EINTR); |
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if (len < 0) |
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return -1; |
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do { |
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len = recv(compositor->launcher_sock, &ret, sizeof ret, 0); |
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} while (len < 0 && errno == EINTR); |
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if (len < 0) |
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return -1; |
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return ret; |
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} |
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@ -0,0 +1,35 @@ |
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/*
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* Copyright © 2012 Benjamin Franzke |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and |
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* its documentation for any purpose is hereby granted without fee, provided |
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* that the above copyright notice appear in all copies and that both that |
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* copyright notice and this permission notice appear in supporting |
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* documentation, and that the name of the copyright holders not be used in |
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* advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. The copyright holders make |
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* no representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
||||
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF |
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#ifndef _WESTON_LAUNCHER_UTIL_H_ |
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#define _WESTON_LAUNCHER_UTIL_H_ |
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#include "compositor.h" |
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int |
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weston_launcher_open(struct weston_compositor *compositor, |
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const char *path, int flags); |
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int |
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weston_launcher_drm_set_master(struct weston_compositor *compositor, |
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int drm_fd, char master); |
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#endif |
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@ -0,0 +1,639 @@ |
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/*
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* Copyright © 2012 Benjamin Franzke |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and |
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* its documentation for any purpose is hereby granted without fee, provided |
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* that the above copyright notice appear in all copies and that both that |
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* copyright notice and this permission notice appear in supporting |
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* documentation, and that the name of the copyright holders not be used in |
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* advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. The copyright holders make |
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* no representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF |
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#define _GNU_SOURCE |
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#include "config.h" |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include <error.h> |
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#include <getopt.h> |
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/stat.h> |
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#include <sys/wait.h> |
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#include <sys/socket.h> |
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#include <sys/epoll.h> |
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#include <sys/signalfd.h> |
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#include <signal.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <termios.h> |
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#include <linux/vt.h> |
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#include <linux/major.h> |
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#include <pwd.h> |
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#include <grp.h> |
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#include <security/pam_appl.h> |
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#include <xf86drm.h> |
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#ifdef HAVE_SYSTEMD_LOGIN |
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#include <systemd/sd-login.h> |
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#endif |
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#include "weston-launch.h" |
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struct weston_launch { |
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struct pam_conv pc; |
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pam_handle_t *ph; |
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int tty; |
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int ttynr; |
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int sock[2]; |
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struct passwd *pw; |
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int epollfd; |
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int signalfd; |
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pid_t child; |
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int verbose; |
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}; |
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static gid_t * |
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read_groups(void) |
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{ |
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int n; |
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gid_t *groups; |
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n = getgroups(0, NULL); |
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groups = malloc(n * sizeof(gid_t)); |
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if (!groups) |
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return NULL; |
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if (getgroups(n, groups) < 0) { |
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free(groups); |
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return NULL; |
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} |
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return groups; |
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} |
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static int |
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weston_launch_allowed(struct weston_launch *wl) |
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{ |
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struct group *gr; |
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gid_t *groups; |
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int i; |
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#ifdef HAVE_SYSTEMD_LOGIN |
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char *session, *seat; |
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int err; |
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#endif |
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if (getuid() == 0) |
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return 1; |
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gr = getgrnam("weston-launch"); |
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if (gr) { |
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groups = read_groups(); |
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if (groups) { |
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for (i = 0; groups[i]; ++i) { |
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if (groups[i] == gr->gr_gid) { |
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free(groups); |
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return 1; |
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} |
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} |
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free(groups); |
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} |
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} |
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#ifdef HAVE_SYSTEMD_LOGIN |
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err = sd_pid_get_session(getpid(), &session); |
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if (err == 0 && session) { |
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if (sd_session_is_active(session) && |
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sd_session_get_seat(session, &seat) == 0) { |
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free(seat); |
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free(session); |
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return 1; |
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} |
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free(session); |
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} |
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#endif |
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return 0; |
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} |
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static int |
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pam_conversation_fn(int msg_count, |
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const struct pam_message **messages, |
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struct pam_response **responses, |
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void *user_data) |
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{ |
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return PAM_SUCCESS; |
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} |
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static int |
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setup_pam(struct weston_launch *wl) |
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{ |
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int err; |
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wl->pc.conv = pam_conversation_fn; |
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wl->pc.appdata_ptr = wl; |
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err = pam_start("login", wl->pw->pw_name, &wl->pc, &wl->ph); |
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err = pam_set_item(wl->ph, PAM_TTY, ttyname(wl->tty)); |
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if (err != PAM_SUCCESS) { |
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fprintf(stderr, "failed to set PAM_TTY item: %d: %s\n", |
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err, pam_strerror(wl->ph, err)); |
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return -1; |
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} |
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err = pam_open_session(wl->ph, 0); |
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if (err != PAM_SUCCESS) { |
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fprintf(stderr, "failed to open pam session: %d: %s\n", |
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err, pam_strerror(wl->ph, err)); |
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return -1; |
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} |
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return 0; |
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} |
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static int |
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setup_launcher_socket(struct weston_launch *wl) |
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{ |
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struct epoll_event ev; |
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if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, wl->sock) < 0) |
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error(1, errno, "socketpair failed"); |
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fcntl(wl->sock[0], F_SETFD, O_CLOEXEC); |
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memset(&ev, 0, sizeof ev); |
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ev.events = EPOLLIN; |
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ev.data.fd = wl->sock[0]; |
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if (epoll_ctl(wl->epollfd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0) |
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return -errno; |
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return 0; |
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} |
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static int |
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setup_signals(struct weston_launch *wl) |
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{ |
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sigset_t mask; |
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struct sigaction sa; |
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struct epoll_event ev; |
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memset(&sa, 0, sizeof sa); |
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sa.sa_handler = SIG_DFL; |
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sa.sa_flags = SA_NOCLDSTOP | SA_RESTART; |
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assert(sigaction(SIGCHLD, &sa, NULL) == 0); |
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assert(sigemptyset(&mask) == 0); |
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sigaddset(&mask, SIGCHLD); |
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sigaddset(&mask, SIGINT); |
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sigaddset(&mask, SIGTERM); |
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assert(sigprocmask(SIG_BLOCK, &mask, NULL) == 0); |
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wl->signalfd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC); |
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if (wl->signalfd < 0) |
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return -errno; |
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memset(&ev, 0, sizeof ev); |
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ev.events = EPOLLIN; |
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ev.data.fd = wl->signalfd; |
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if (epoll_ctl(wl->epollfd, EPOLL_CTL_ADD, ev.data.fd, &ev) < 0) |
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return -errno; |
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return 0; |
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} |
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static void |
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setenv_fd(const char *env, int fd) |
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{ |
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char buf[32]; |
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snprintf(buf, sizeof buf, "%d", fd); |
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setenv(env, buf, 1); |
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} |
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static int |
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handle_setmaster(struct weston_launch *wl, struct msghdr *msg, ssize_t len) |
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{ |
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int drm_fd = -1, ret = -1; |
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struct cmsghdr *cmsg; |
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struct weston_launcher_set_master *message; |
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if (len != sizeof(*message)) { |
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error(0, 0, "missing value in setmaster request"); |
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goto out; |
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} |
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message = msg->msg_iov->iov_base; |
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cmsg = CMSG_FIRSTHDR(msg); |
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if (!cmsg || |
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cmsg->cmsg_level != SOL_SOCKET || |
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cmsg->cmsg_type != SCM_RIGHTS) { |
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error(0, 0, "invalid control message"); |
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goto out; |
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} |
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drm_fd = *(int *) CMSG_DATA(cmsg); |
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if (drm_fd == -1) { |
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error(0, 0, "missing drm fd in socket request"); |
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goto out; |
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} |
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if (message->set_master) |
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ret = drmSetMaster(drm_fd); |
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else |
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ret = drmDropMaster(drm_fd); |
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close(drm_fd); |
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out: |
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do { |
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len = send(wl->sock[0], &ret, sizeof ret, 0); |
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} while (len < 0 && errno == EINTR); |
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if (len < 0) |
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return -1; |
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return 0; |
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} |
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static int |
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handle_open(struct weston_launch *wl, struct msghdr *msg, ssize_t len) |
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{ |
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int fd = -1, ret = -1; |
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char control[CMSG_SPACE(sizeof(fd))]; |
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struct cmsghdr *cmsg; |
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struct stat s; |
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struct msghdr nmsg; |
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struct iovec iov; |
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struct weston_launcher_open *message; |
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message = msg->msg_iov->iov_base; |
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if ((size_t)len < sizeof(*message)) |
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goto err0; |
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/* Ensure path is null-terminated */ |
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((char *) message)[len-1] = '\0'; |
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if (stat(message->path, &s) < 0) |
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goto err0; |
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fd = open(message->path, message->flags); |
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if (fd < 0) |
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goto err0; |
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if (major(s.st_rdev) != INPUT_MAJOR) { |
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close(fd); |
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fd = -1; |
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goto err0; |
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} |
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err0: |
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memset(&nmsg, 0, sizeof nmsg); |
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nmsg.msg_iov = &iov; |
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nmsg.msg_iovlen = 1; |
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if (fd != -1) { |
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nmsg.msg_control = control; |
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nmsg.msg_controllen = sizeof control; |
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cmsg = CMSG_FIRSTHDR(&nmsg); |
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cmsg->cmsg_level = SOL_SOCKET; |
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cmsg->cmsg_type = SCM_RIGHTS; |
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); |
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*(int *) CMSG_DATA(cmsg) = fd; |
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nmsg.msg_controllen = cmsg->cmsg_len; |
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ret = 0; |
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} |
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iov.iov_base = &ret; |
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iov.iov_len = sizeof ret; |
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|
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if (wl->verbose) |
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fprintf(stderr, "weston-launch: opened %s: ret: %d, fd: %d\n", |
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message->path, ret, fd); |
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do { |
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len = sendmsg(wl->sock[0], &nmsg, 0); |
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} while (len < 0 && errno == EINTR); |
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|
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if (len < 0) |
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return -1; |
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|
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return 0; |
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} |
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|
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static int |
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handle_socket_msg(struct weston_launch *wl) |
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{ |
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char control[CMSG_SPACE(sizeof(int))]; |
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char buf[BUFSIZ]; |
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struct msghdr msg; |
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struct iovec iov; |
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int ret = -1; |
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ssize_t len; |
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struct weston_launcher_message *message; |
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|
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memset(&msg, 0, sizeof(msg)); |
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iov.iov_base = buf; |
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iov.iov_len = sizeof buf; |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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msg.msg_control = control; |
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msg.msg_controllen = sizeof control; |
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|
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do { |
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len = recvmsg(wl->sock[0], &msg, 0); |
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} while (len < 0 && errno == EINTR); |
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|
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if (len < 1) |
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return -1; |
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|
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message = (void *) buf; |
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switch (message->opcode) { |
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case WESTON_LAUNCHER_OPEN: |
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ret = handle_open(wl, &msg, len); |
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break; |
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case WESTON_LAUNCHER_DRM_SET_MASTER: |
||||
ret = handle_setmaster(wl, &msg, len); |
||||
break; |
||||
} |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static void |
||||
quit(struct weston_launch *wl, int status) |
||||
{ |
||||
int err; |
||||
|
||||
close(wl->epollfd); |
||||
close(wl->signalfd); |
||||
close(wl->sock[0]); |
||||
|
||||
err = pam_close_session(wl->ph, 0); |
||||
if (err) |
||||
fprintf(stderr, "pam_close_session failed: %d: %s\n", |
||||
err, pam_strerror(wl->ph, err)); |
||||
pam_end(wl->ph, err); |
||||
|
||||
exit(status); |
||||
} |
||||
|
||||
static int |
||||
handle_signal(struct weston_launch *wl) |
||||
{ |
||||
struct signalfd_siginfo sig; |
||||
int pid, status; |
||||
|
||||
if (read(wl->signalfd, &sig, sizeof sig) != sizeof sig) { |
||||
error(0, errno, "reading signalfd failed"); |
||||
return -1; |
||||
} |
||||
|
||||
switch (sig.ssi_signo) { |
||||
case SIGCHLD: |
||||
pid = waitpid(-1, &status, 0); |
||||
if (pid == wl->child) { |
||||
wl->child = 0; |
||||
quit(wl, WIFEXITED(status) ? WEXITSTATUS(status) : 0); |
||||
} |
||||
break; |
||||
case SIGTERM: |
||||
if (wl->child) |
||||
kill(wl->child, SIGTERM); |
||||
quit(wl, 0); |
||||
break; |
||||
case SIGINT: |
||||
if (wl->child) |
||||
kill(wl->child, SIGTERM); |
||||
break; |
||||
default: |
||||
return -1; |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int |
||||
setup_tty(struct weston_launch *wl, const char *tty) |
||||
{ |
||||
struct stat buf; |
||||
char *t; |
||||
|
||||
if (tty) { |
||||
t = ttyname(STDIN_FILENO); |
||||
if (t && strcmp(t, tty) == 0) |
||||
wl->tty = STDIN_FILENO; |
||||
else |
||||
wl->tty = open(tty, O_RDWR | O_NOCTTY); |
||||
} else { |
||||
int tty0 = open("/dev/tty0", O_WRONLY | O_CLOEXEC); |
||||
char filename[16]; |
||||
|
||||
if (tty0 < 0) |
||||
error(1, errno, "count not open tty0"); |
||||
|
||||
if (ioctl(tty0, VT_OPENQRY, &wl->ttynr) < 0 || wl->ttynr == -1) |
||||
error(1, errno, "failed to find non-opened console");
|
||||
|
||||
snprintf(filename, sizeof filename, "/dev/tty%d", wl->ttynr); |
||||
wl->tty = open(filename, O_RDWR | O_NOCTTY); |
||||
close(tty0); |
||||
} |
||||
|
||||
if (wl->tty < 0) |
||||
error(1, errno, "failed to open tty"); |
||||
|
||||
if (tty) { |
||||
if (fstat(wl->tty, &buf) < 0) |
||||
error(1, errno, "stat %s failed", tty); |
||||
|
||||
if (major(buf.st_rdev) != TTY_MAJOR) |
||||
error(1, 0, "invalid tty device: %s", tty); |
||||
|
||||
wl->ttynr = minor(buf.st_rdev); |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void |
||||
help(const char *name) |
||||
{ |
||||
fprintf(stderr, "Usage: %s [args...] [-- [weston args..]]\n", name); |
||||
fprintf(stderr, " -u, --user Start session as specified username\n"); |
||||
fprintf(stderr, " -t, --tty Start session on alternative tty device\n"); |
||||
fprintf(stderr, " -v, --verbose Be verbose\n"); |
||||
fprintf(stderr, " -s, --sleep Sleep specified amount of time before exec\n"); |
||||
fprintf(stderr, " -h, --help Display this help message\n"); |
||||
} |
||||
|
||||
int |
||||
main(int argc, char *argv[]) |
||||
{ |
||||
struct weston_launch wl; |
||||
char **env; |
||||
int i, c; |
||||
char **child_argv; |
||||
char *tty = NULL, *new_user = NULL; |
||||
int sleep_fork = 0; |
||||
struct option opts[] = { |
||||
{ "user", required_argument, NULL, 'u' }, |
||||
{ "tty", required_argument, NULL, 't' }, |
||||
{ "verbose", no_argument, NULL, 'v' }, |
||||
{ "sleep", optional_argument, NULL, 's' }, |
||||
{ "help", no_argument, NULL, 'h' }, |
||||
{ 0, 0, NULL, 0 } |
||||
};
|
||||
|
||||
memset(&wl, 0, sizeof wl); |
||||
|
||||
while ((c = getopt_long(argc, argv, "u:t:s::vh", opts, &i)) != -1) { |
||||
switch (c) { |
||||
case 'u': |
||||
new_user = optarg; |
||||
if (getuid() != 0) |
||||
error(1, 0, "Permission denied. -u allowed for root only"); |
||||
break; |
||||
case 't': |
||||
tty = optarg; |
||||
break; |
||||
case 'v': |
||||
wl.verbose = 1; |
||||
break; |
||||
case 's': |
||||
if (optarg) |
||||
sleep_fork = atoi(optarg); |
||||
else |
||||
sleep_fork = 10; |
||||
break; |
||||
case 'h': |
||||
help("weston"); |
||||
exit(1); |
||||
} |
||||
} |
||||
|
||||
child_argv = &argv[optind-1]; |
||||
child_argv[0] = BINDIR "/weston"; |
||||
|
||||
if (new_user) |
||||
wl.pw = getpwnam(new_user); |
||||
else |
||||
wl.pw = getpwuid(getuid()); |
||||
if (wl.pw == NULL) |
||||
error(1, errno, "failed to get username"); |
||||
|
||||
if (!weston_launch_allowed(&wl)) |
||||
error(1, 0, "Permission denied. You should..\n" |
||||
#ifdef HAVE_SYSTEMD_LOGIN |
||||
" - run from an active and local (systemd) session.\n" |
||||
#else |
||||
" - enable systemd session support for weston-launch.\n" |
||||
#endif |
||||
" - add yourself to the 'weston-launch' group."); |
||||
|
||||
if (setup_tty(&wl, tty) < 0) |
||||
return 1; |
||||
|
||||
if (setup_pam(&wl) < 0) |
||||
return 1; |
||||
|
||||
wl.epollfd = epoll_create1(EPOLL_CLOEXEC); |
||||
if (wl.epollfd < 0) |
||||
error(1, errno, "epoll create failed"); |
||||
|
||||
if (setup_launcher_socket(&wl) < 0) |
||||
return 1; |
||||
|
||||
if (setup_signals(&wl) < 0) |
||||
return 1; |
||||
|
||||
switch ((wl.child = fork())) { |
||||
case -1: |
||||
error(1, errno, "fork failed"); |
||||
break; |
||||
case 0: |
||||
if (wl.verbose) |
||||
printf("weston-launch: spawned weston with pid: %d\n", getpid()); |
||||
if (wl.tty != STDIN_FILENO) { |
||||
if (setsid() < 0) |
||||
error(1, errno, "setsid failed"); |
||||
if (ioctl(wl.tty, TIOCSCTTY, 0) < 0) |
||||
error(1, errno, "TIOCSCTTY failed - tty is in use"); |
||||
} |
||||
|
||||
if (setgid(wl.pw->pw_gid) < 0 || |
||||
setuid(wl.pw->pw_uid) < 0) |
||||
error(1, errno, "dropping privilidges failed"); |
||||
|
||||
if (sleep_fork) { |
||||
if (wl.verbose) |
||||
printf("weston-launch: waiting %d seconds\n", sleep_fork); |
||||
sleep(sleep_fork); |
||||
} |
||||
|
||||
if (new_user) { |
||||
setenv("USER", wl.pw->pw_name, 1); |
||||
setenv("LOGNAME", wl.pw->pw_name, 1); |
||||
setenv("HOME", wl.pw->pw_dir, 1); |
||||
setenv("SHELL", wl.pw->pw_shell, 1); |
||||
} |
||||
env = pam_getenvlist(wl.ph); |
||||
if (env) { |
||||
for (i = 0; env[i]; ++i) { |
||||
if (putenv(env[i]) < 0) |
||||
error(0, 0, "putenv %s failed", env[i]); |
||||
} |
||||
free(env); |
||||
} |
||||
|
||||
if (wl.tty != STDIN_FILENO) |
||||
setenv_fd("WESTON_TTY_FD", wl.tty); |
||||
|
||||
setenv_fd("WESTON_LAUNCHER_SOCK", wl.sock[1]); |
||||
|
||||
unsetenv("DISPLAY"); |
||||
|
||||
execv(child_argv[0], child_argv); |
||||
error(1, errno, "exec failed"); |
||||
break; |
||||
default: |
||||
close(wl.sock[1]); |
||||
if (wl.tty != STDIN_FILENO) |
||||
close(wl.tty); |
||||
|
||||
while (1) { |
||||
struct epoll_event ev; |
||||
int n; |
||||
|
||||
n = epoll_wait(wl.epollfd, &ev, 1, -1); |
||||
if (n < 0) |
||||
error(0, errno, "epoll_wait failed"); |
||||
if (n != 1) |
||||
continue; |
||||
|
||||
if (ev.data.fd == wl.sock[0]) |
||||
handle_socket_msg(&wl); |
||||
else if (ev.data.fd == wl.signalfd) |
||||
handle_signal(&wl); |
||||
} |
||||
break; |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
@ -0,0 +1,46 @@ |
||||
/*
|
||||
* Copyright © 2012 Benjamin Franzke |
||||
* |
||||
* Permission to use, copy, modify, distribute, and sell this software and |
||||
* its documentation for any purpose is hereby granted without fee, provided |
||||
* that the above copyright notice appear in all copies and that both that |
||||
* copyright notice and this permission notice appear in supporting |
||||
* documentation, and that the name of the copyright holders not be used in |
||||
* advertising or publicity pertaining to distribution of the software |
||||
* without specific, written prior permission. The copyright holders make |
||||
* no representations about the suitability of this software for any |
||||
* purpose. It is provided "as is" without express or implied warranty. |
||||
* |
||||
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS |
||||
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
||||
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY |
||||
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
||||
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF |
||||
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
||||
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
||||
*/ |
||||
|
||||
#ifndef _WESTON_LAUNCH_H_ |
||||
#define _WESTON_LAUNCH_H_ |
||||
|
||||
enum weston_launcher_opcode { |
||||
WESTON_LAUNCHER_OPEN, |
||||
WESTON_LAUNCHER_DRM_SET_MASTER |
||||
}; |
||||
|
||||
struct weston_launcher_message { |
||||
int opcode; |
||||
}; |
||||
|
||||
struct weston_launcher_open { |
||||
struct weston_launcher_message header; |
||||
int flags; |
||||
char path[0]; |
||||
}; |
||||
|
||||
struct weston_launcher_set_master { |
||||
struct weston_launcher_message header; |
||||
int set_master; |
||||
}; |
||||
|
||||
#endif |
||||
Loading…
Reference in new issue