370 lines
11 KiB
C
370 lines
11 KiB
C
/* Copyright (c) 2008-2012 Apple Inc.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
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* HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name(s) of the above
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* copyright holders shall not be used in advertising or otherwise to
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* promote the sale, use or other dealings in this Software without
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* prior written authorization.
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*/
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#include <CoreServices/CoreServices.h>
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <asl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#define kX11AppBundleId BUNDLE_ID_PREFIX ".X11"
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#define kX11AppBundlePath "/Contents/MacOS/X11"
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#include <mach/mach.h>
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#include <mach/mach_error.h>
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#include <servers/bootstrap.h>
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#include "mach_startup.h"
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#include <signal.h>
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#include "launchd_fd.h"
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static char x11_path[PATH_MAX + 1];
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static pid_t x11app_pid = 0;
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aslclient aslc;
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static void
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set_x11_path(void)
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{
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CFURLRef appURL = NULL;
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OSStatus osstatus =
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LSFindApplicationForInfo(kLSUnknownCreator, CFSTR(
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kX11AppBundleId), nil, nil, &appURL);
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switch (osstatus) {
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case noErr:
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if (appURL == NULL) {
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asl_log(
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aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Invalid response from LSFindApplicationForInfo(%s)",
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kX11AppBundleId);
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exit(1);
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}
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if (!CFURLGetFileSystemRepresentation(appURL, true,
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(unsigned char *)x11_path,
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sizeof(x11_path))) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Error resolving URL for %s",
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kX11AppBundleId);
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exit(3);
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}
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strlcat(x11_path, kX11AppBundlePath, sizeof(x11_path));
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asl_log(aslc, NULL, ASL_LEVEL_INFO, "Xquartz: X11.app = %s", x11_path);
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break;
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case kLSApplicationNotFoundErr:
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Unable to find application for %s",
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kX11AppBundleId);
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exit(10);
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default:
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Unable to find application for %s, error code = %d",
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kX11AppBundleId,
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(int)osstatus);
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exit(11);
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}
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}
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static int
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connect_to_socket(const char *filename)
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{
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struct sockaddr_un servaddr_un;
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struct sockaddr *servaddr;
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socklen_t servaddr_len;
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int ret_fd;
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/* Setup servaddr_un */
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memset(&servaddr_un, 0, sizeof(struct sockaddr_un));
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servaddr_un.sun_family = AF_UNIX;
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strlcpy(servaddr_un.sun_path, filename, sizeof(servaddr_un.sun_path));
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servaddr = (struct sockaddr *)&servaddr_un;
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servaddr_len = sizeof(struct sockaddr_un) -
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sizeof(servaddr_un.sun_path) + strlen(filename);
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ret_fd = socket(PF_UNIX, SOCK_STREAM, 0);
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if (ret_fd == -1) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Failed to create socket: %s - %s", filename,
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strerror(
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errno));
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return -1;
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}
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if (connect(ret_fd, servaddr, servaddr_len) < 0) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Failed to connect to socket: %s - %d - %s",
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filename, errno,
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strerror(
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errno));
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close(ret_fd);
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return -1;
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}
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return ret_fd;
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}
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static void
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send_fd_handoff(int connected_fd, int launchd_fd)
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{
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char databuf[] = "display";
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struct iovec iov[1];
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union {
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struct cmsghdr hdr;
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char bytes[CMSG_SPACE(sizeof(int))];
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} buf;
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struct msghdr msg;
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struct cmsghdr *cmsg;
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iov[0].iov_base = databuf;
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iov[0].iov_len = sizeof(databuf);
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_control = buf.bytes;
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msg.msg_controllen = sizeof(buf);
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msg.msg_name = 0;
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msg.msg_namelen = 0;
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msg.msg_flags = 0;
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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(int));
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msg.msg_controllen = cmsg->cmsg_len;
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*((int *)CMSG_DATA(cmsg)) = launchd_fd;
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if (sendmsg(connected_fd, &msg, 0) < 0) {
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asl_log(
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aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Error sending $DISPLAY file descriptor over fd %d: %d -- %s",
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connected_fd, errno, strerror(errno));
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return;
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}
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asl_log(aslc, NULL, ASL_LEVEL_DEBUG,
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"Xquartz: Message sent. Closing handoff fd.");
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close(connected_fd);
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}
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__attribute__((__noreturn__))
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static void
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signal_handler(int sig)
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{
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if (x11app_pid)
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kill(x11app_pid, sig);
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_exit(0);
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}
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int
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main(int argc, char **argv, char **envp)
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{
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int envpc;
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kern_return_t kr;
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mach_port_t mp;
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string_array_t newenvp;
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string_array_t newargv;
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size_t i;
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int launchd_fd;
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string_t handoff_socket_filename;
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sig_t handler;
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char *asl_sender;
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char *asl_facility;
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char *server_bootstrap_name = kX11AppBundleId;
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if (getenv("X11_PREFS_DOMAIN"))
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server_bootstrap_name = getenv("X11_PREFS_DOMAIN");
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asprintf(&asl_sender, "%s.stub", server_bootstrap_name);
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assert(asl_sender);
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asl_facility = strdup(server_bootstrap_name);
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assert(asl_facility);
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if (strcmp(asl_facility + strlen(asl_facility) - 4, ".X11") == 0)
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asl_facility[strlen(asl_facility) - 4] = '\0';
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assert(aslc = asl_open(asl_sender, asl_facility, ASL_OPT_NO_DELAY));
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free(asl_sender);
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free(asl_facility);
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/* We don't have a mechanism in place to handle this interrupt driven
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* server-start notification, so just send the signal now, so xinit doesn't
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* time out waiting for it and will just poll for the server.
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*/
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handler = signal(SIGUSR1, SIG_IGN);
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if (handler == SIG_IGN)
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kill(getppid(), SIGUSR1);
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signal(SIGUSR1, handler);
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/* Pass on SIGs to X11.app */
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signal(SIGINT, signal_handler);
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signal(SIGTERM, signal_handler);
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/* Get the $DISPLAY FD */
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launchd_fd = launchd_display_fd();
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kr = bootstrap_look_up(bootstrap_port, server_bootstrap_name, &mp);
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if (kr != KERN_SUCCESS) {
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pid_t child;
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asl_log(aslc, NULL, ASL_LEVEL_WARNING,
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"Xquartz: Unable to locate waiting server: %s",
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server_bootstrap_name);
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set_x11_path();
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/* This forking is ugly and will be cleaned up later */
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child = fork();
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if (child == -1) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Could not fork: %s",
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strerror(
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errno));
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return EXIT_FAILURE;
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}
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if (child == 0) {
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char *_argv[3];
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_argv[0] = x11_path;
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_argv[1] = "--listenonly";
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_argv[2] = NULL;
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asl_log(aslc, NULL, ASL_LEVEL_NOTICE,
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"Xquartz: Starting X server: %s --listenonly",
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x11_path);
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return execvp(x11_path, _argv);
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}
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/* Try connecting for 10 seconds */
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for (i = 0; i < 80; i++) {
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usleep(250000);
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kr = bootstrap_look_up(bootstrap_port, server_bootstrap_name, &mp);
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if (kr == KERN_SUCCESS)
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break;
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}
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if (kr != KERN_SUCCESS) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: bootstrap_look_up(): %s", bootstrap_strerror(
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kr));
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return EXIT_FAILURE;
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}
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}
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/* Get X11.app's pid */
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request_pid(mp, &x11app_pid);
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/* Handoff the $DISPLAY FD */
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if (launchd_fd != -1) {
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size_t try, try_max;
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int handoff_fd = -1;
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for (try = 0, try_max = 5; try < try_max; try++) {
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if (request_fd_handoff_socket(mp,
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handoff_socket_filename) !=
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KERN_SUCCESS) {
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asl_log(
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aslc, NULL, ASL_LEVEL_INFO,
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"Xquartz: Failed to request a socket from the server to send the $DISPLAY fd over (try %d of %d)",
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(int)try + 1, (int)try_max);
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continue;
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}
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handoff_fd = connect_to_socket(handoff_socket_filename);
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if (handoff_fd == -1) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Failed to connect to socket (try %d of %d)",
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(int)try + 1,
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(int)try_max);
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continue;
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}
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asl_log(
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aslc, NULL, ASL_LEVEL_INFO,
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"Xquartz: Handoff connection established (try %d of %d) on fd %d, \"%s\". Sending message.",
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(int)try + 1, (int)try_max, handoff_fd,
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handoff_socket_filename);
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send_fd_handoff(handoff_fd, launchd_fd);
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close(handoff_fd);
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break;
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}
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}
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/* Count envp */
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for (envpc = 0; envp[envpc]; envpc++) ;
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/* We have fixed-size string lengths due to limitations in IPC,
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* so we need to copy our argv and envp.
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*/
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newargv = (string_array_t)calloc((1 + argc), sizeof(string_t));
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newenvp = (string_array_t)calloc((1 + envpc), sizeof(string_t));
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if (!newargv || !newenvp) {
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/* Silence the clang static analyzer */
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free(newargv);
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free(newenvp);
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asl_log(aslc, NULL, ASL_LEVEL_ERR,
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"Xquartz: Memory allocation failure");
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return EXIT_FAILURE;
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}
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for (i = 0; i < argc; i++) {
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strlcpy(newargv[i], argv[i], STRING_T_SIZE);
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}
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for (i = 0; i < envpc; i++) {
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strlcpy(newenvp[i], envp[i], STRING_T_SIZE);
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}
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kr = start_x11_server(mp, newargv, argc, newenvp, envpc);
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free(newargv);
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free(newenvp);
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if (kr != KERN_SUCCESS) {
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asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: start_x11_server: %s",
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mach_error_string(
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kr));
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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