| 1 | /* Copyright (c) 2008-2012 Apple Inc. |
| 2 | * |
| 3 | * Permission is hereby granted, free of charge, to any person |
| 4 | * obtaining a copy of this software and associated documentation files |
| 5 | * (the "Software"), to deal in the Software without restriction, |
| 6 | * including without limitation the rights to use, copy, modify, merge, |
| 7 | * publish, distribute, sublicense, and/or sell copies of the Software, |
| 8 | * and to permit persons to whom the Software is furnished to do so, |
| 9 | * subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be |
| 12 | * included in all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 15 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 17 | * NONINFRINGEMENT. IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT |
| 18 | * HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 21 | * DEALINGS IN THE SOFTWARE. |
| 22 | * |
| 23 | * Except as contained in this notice, the name(s) of the above |
| 24 | * copyright holders shall not be used in advertising or otherwise to |
| 25 | * promote the sale, use or other dealings in this Software without |
| 26 | * prior written authorization. |
| 27 | */ |
| 28 | |
| 29 | #include <CoreServices/CoreServices.h> |
| 30 | |
| 31 | #ifdef HAVE_DIX_CONFIG_H |
| 32 | #include <dix-config.h> |
| 33 | #endif |
| 34 | |
| 35 | #include <string.h> |
| 36 | #include <unistd.h> |
| 37 | #include <errno.h> |
| 38 | #include <asl.h> |
| 39 | |
| 40 | #include <sys/socket.h> |
| 41 | #include <sys/un.h> |
| 42 | |
| 43 | #define kX11AppBundleId BUNDLE_ID_PREFIX ".X11" |
| 44 | #define kX11AppBundlePath "/Contents/MacOS/X11" |
| 45 | |
| 46 | #include <mach/mach.h> |
| 47 | #include <mach/mach_error.h> |
| 48 | #include <servers/bootstrap.h> |
| 49 | #include "mach_startup.h" |
| 50 | |
| 51 | #include <signal.h> |
| 52 | |
| 53 | #include <AvailabilityMacros.h> |
| 54 | |
| 55 | #include "launchd_fd.h" |
| 56 | |
| 57 | static char x11_path[PATH_MAX + 1]; |
| 58 | static pid_t x11app_pid = 0; |
| 59 | aslclient aslc; |
| 60 | |
| 61 | static void |
| 62 | set_x11_path(void) |
| 63 | { |
| 64 | #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050 |
| 65 | |
| 66 | CFURLRef appURL = NULL; |
| 67 | OSStatus osstatus = |
| 68 | LSFindApplicationForInfo(kLSUnknownCreator, CFSTR( |
| 69 | kX11AppBundleId), nil, nil, &appURL); |
| 70 | |
| 71 | switch (osstatus) { |
| 72 | case noErr: |
| 73 | if (appURL == NULL) { |
| 74 | asl_log( |
| 75 | aslc, NULL, ASL_LEVEL_ERR, |
| 76 | "Xquartz: Invalid response from LSFindApplicationForInfo(%s)", |
| 77 | kX11AppBundleId); |
| 78 | exit(1); |
| 79 | } |
| 80 | |
| 81 | if (!CFURLGetFileSystemRepresentation(appURL, true, |
| 82 | (unsigned char *)x11_path, |
| 83 | sizeof(x11_path))) { |
| 84 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 85 | "Xquartz: Error resolving URL for %s", |
| 86 | kX11AppBundleId); |
| 87 | exit(3); |
| 88 | } |
| 89 | |
| 90 | strlcat(x11_path, kX11AppBundlePath, sizeof(x11_path)); |
| 91 | asl_log(aslc, NULL, ASL_LEVEL_INFO, "Xquartz: X11.app = %s", x11_path); |
| 92 | break; |
| 93 | |
| 94 | case kLSApplicationNotFoundErr: |
| 95 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 96 | "Xquartz: Unable to find application for %s", |
| 97 | kX11AppBundleId); |
| 98 | exit(10); |
| 99 | |
| 100 | default: |
| 101 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 102 | "Xquartz: Unable to find application for %s, error code = %d", |
| 103 | kX11AppBundleId, |
| 104 | (int)osstatus); |
| 105 | exit(11); |
| 106 | } |
| 107 | #else |
| 108 | /* TODO: Make Tiger smarter... but TBH, this should never get called on Tiger... */ |
| 109 | strlcpy(x11_path, "/Applications/Utilities/X11.app/Contents/MacOS/X11", |
| 110 | sizeof(x11_path)); |
| 111 | #endif |
| 112 | } |
| 113 | |
| 114 | static int |
| 115 | connect_to_socket(const char *filename) |
| 116 | { |
| 117 | struct sockaddr_un servaddr_un; |
| 118 | struct sockaddr *servaddr; |
| 119 | socklen_t servaddr_len; |
| 120 | int ret_fd; |
| 121 | |
| 122 | /* Setup servaddr_un */ |
| 123 | memset(&servaddr_un, 0, sizeof(struct sockaddr_un)); |
| 124 | servaddr_un.sun_family = AF_UNIX; |
| 125 | strlcpy(servaddr_un.sun_path, filename, sizeof(servaddr_un.sun_path)); |
| 126 | |
| 127 | servaddr = (struct sockaddr *)&servaddr_un; |
| 128 | servaddr_len = sizeof(struct sockaddr_un) - |
| 129 | sizeof(servaddr_un.sun_path) + strlen(filename); |
| 130 | |
| 131 | ret_fd = socket(PF_UNIX, SOCK_STREAM, 0); |
| 132 | if (ret_fd == -1) { |
| 133 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 134 | "Xquartz: Failed to create socket: %s - %s", filename, |
| 135 | strerror( |
| 136 | errno)); |
| 137 | return -1; |
| 138 | } |
| 139 | |
| 140 | if (connect(ret_fd, servaddr, servaddr_len) < 0) { |
| 141 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 142 | "Xquartz: Failed to connect to socket: %s - %d - %s", |
| 143 | filename, errno, |
| 144 | strerror( |
| 145 | errno)); |
| 146 | close(ret_fd); |
| 147 | return -1; |
| 148 | } |
| 149 | |
| 150 | return ret_fd; |
| 151 | } |
| 152 | |
| 153 | static void |
| 154 | send_fd_handoff(int connected_fd, int launchd_fd) |
| 155 | { |
| 156 | char databuf[] = "display"; |
| 157 | struct iovec iov[1]; |
| 158 | |
| 159 | union { |
| 160 | struct cmsghdr hdr; |
| 161 | char bytes[CMSG_SPACE(sizeof(int))]; |
| 162 | } buf; |
| 163 | |
| 164 | struct msghdr msg; |
| 165 | struct cmsghdr *cmsg; |
| 166 | |
| 167 | iov[0].iov_base = databuf; |
| 168 | iov[0].iov_len = sizeof(databuf); |
| 169 | |
| 170 | msg.msg_iov = iov; |
| 171 | msg.msg_iovlen = 1; |
| 172 | msg.msg_control = buf.bytes; |
| 173 | msg.msg_controllen = sizeof(buf); |
| 174 | msg.msg_name = 0; |
| 175 | msg.msg_namelen = 0; |
| 176 | msg.msg_flags = 0; |
| 177 | |
| 178 | cmsg = CMSG_FIRSTHDR(&msg); |
| 179 | cmsg->cmsg_level = SOL_SOCKET; |
| 180 | cmsg->cmsg_type = SCM_RIGHTS; |
| 181 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); |
| 182 | |
| 183 | msg.msg_controllen = cmsg->cmsg_len; |
| 184 | |
| 185 | *((int *)CMSG_DATA(cmsg)) = launchd_fd; |
| 186 | |
| 187 | if (sendmsg(connected_fd, &msg, 0) < 0) { |
| 188 | asl_log( |
| 189 | aslc, NULL, ASL_LEVEL_ERR, |
| 190 | "Xquartz: Error sending $DISPLAY file descriptor over fd %d: %d -- %s", |
| 191 | connected_fd, errno, strerror(errno)); |
| 192 | return; |
| 193 | } |
| 194 | |
| 195 | asl_log(aslc, NULL, ASL_LEVEL_DEBUG, |
| 196 | "Xquartz: Message sent. Closing handoff fd."); |
| 197 | close(connected_fd); |
| 198 | } |
| 199 | |
| 200 | __attribute__((__noreturn__)) |
| 201 | static void |
| 202 | signal_handler(int sig) |
| 203 | { |
| 204 | if (x11app_pid) |
| 205 | kill(x11app_pid, sig); |
| 206 | _exit(0); |
| 207 | } |
| 208 | |
| 209 | int |
| 210 | main(int argc, char **argv, char **envp) |
| 211 | { |
| 212 | int envpc; |
| 213 | kern_return_t kr; |
| 214 | mach_port_t mp; |
| 215 | string_array_t newenvp; |
| 216 | string_array_t newargv; |
| 217 | size_t i; |
| 218 | int launchd_fd; |
| 219 | string_t handoff_socket_filename; |
| 220 | sig_t handler; |
| 221 | char *asl_sender; |
| 222 | char *asl_facility; |
| 223 | char *server_bootstrap_name = kX11AppBundleId; |
| 224 | |
| 225 | if (getenv("X11_PREFS_DOMAIN")) |
| 226 | server_bootstrap_name = getenv("X11_PREFS_DOMAIN"); |
| 227 | |
| 228 | asprintf(&asl_sender, "%s.stub", server_bootstrap_name); |
| 229 | assert(asl_sender); |
| 230 | |
| 231 | asl_facility = strdup(server_bootstrap_name); |
| 232 | assert(asl_facility); |
| 233 | if (strcmp(asl_facility + strlen(asl_facility) - 4, ".X11") == 0) |
| 234 | asl_facility[strlen(asl_facility) - 4] = '\0'; |
| 235 | |
| 236 | assert(aslc = asl_open(asl_sender, asl_facility, ASL_OPT_NO_DELAY)); |
| 237 | free(asl_sender); |
| 238 | free(asl_facility); |
| 239 | |
| 240 | /* We don't have a mechanism in place to handle this interrupt driven |
| 241 | * server-start notification, so just send the signal now, so xinit doesn't |
| 242 | * time out waiting for it and will just poll for the server. |
| 243 | */ |
| 244 | handler = signal(SIGUSR1, SIG_IGN); |
| 245 | if (handler == SIG_IGN) |
| 246 | kill(getppid(), SIGUSR1); |
| 247 | signal(SIGUSR1, handler); |
| 248 | |
| 249 | /* Pass on SIGs to X11.app */ |
| 250 | signal(SIGINT, signal_handler); |
| 251 | signal(SIGTERM, signal_handler); |
| 252 | |
| 253 | /* Get the $DISPLAY FD */ |
| 254 | launchd_fd = launchd_display_fd(); |
| 255 | |
| 256 | kr = bootstrap_look_up(bootstrap_port, server_bootstrap_name, &mp); |
| 257 | if (kr != KERN_SUCCESS) { |
| 258 | pid_t child; |
| 259 | |
| 260 | asl_log(aslc, NULL, ASL_LEVEL_WARNING, |
| 261 | "Xquartz: Unable to locate waiting server: %s", |
| 262 | server_bootstrap_name); |
| 263 | set_x11_path(); |
| 264 | |
| 265 | /* This forking is ugly and will be cleaned up later */ |
| 266 | child = fork(); |
| 267 | if (child == -1) { |
| 268 | asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: Could not fork: %s", |
| 269 | strerror( |
| 270 | errno)); |
| 271 | return EXIT_FAILURE; |
| 272 | } |
| 273 | |
| 274 | if (child == 0) { |
| 275 | char *_argv[3]; |
| 276 | _argv[0] = x11_path; |
| 277 | _argv[1] = "--listenonly"; |
| 278 | _argv[2] = NULL; |
| 279 | asl_log(aslc, NULL, ASL_LEVEL_NOTICE, |
| 280 | "Xquartz: Starting X server: %s --listenonly", |
| 281 | x11_path); |
| 282 | return execvp(x11_path, _argv); |
| 283 | } |
| 284 | |
| 285 | /* Try connecting for 10 seconds */ |
| 286 | for (i = 0; i < 80; i++) { |
| 287 | usleep(250000); |
| 288 | kr = bootstrap_look_up(bootstrap_port, server_bootstrap_name, &mp); |
| 289 | if (kr == KERN_SUCCESS) |
| 290 | break; |
| 291 | } |
| 292 | |
| 293 | if (kr != KERN_SUCCESS) { |
| 294 | #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050 |
| 295 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 296 | "Xquartz: bootstrap_look_up(): %s", bootstrap_strerror( |
| 297 | kr)); |
| 298 | #else |
| 299 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 300 | "Xquartz: bootstrap_look_up(): %ul", |
| 301 | (unsigned long)kr); |
| 302 | #endif |
| 303 | return EXIT_FAILURE; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /* Get X11.app's pid */ |
| 308 | request_pid(mp, &x11app_pid); |
| 309 | |
| 310 | /* Handoff the $DISPLAY FD */ |
| 311 | if (launchd_fd != -1) { |
| 312 | size_t try, try_max; |
| 313 | int handoff_fd = -1; |
| 314 | |
| 315 | for (try = 0, try_max = 5; try < try_max; try++) { |
| 316 | if (request_fd_handoff_socket(mp, |
| 317 | handoff_socket_filename) != |
| 318 | KERN_SUCCESS) { |
| 319 | asl_log( |
| 320 | aslc, NULL, ASL_LEVEL_INFO, |
| 321 | "Xquartz: Failed to request a socket from the server to send the $DISPLAY fd over (try %d of %d)", |
| 322 | (int)try + 1, (int)try_max); |
| 323 | continue; |
| 324 | } |
| 325 | |
| 326 | handoff_fd = connect_to_socket(handoff_socket_filename); |
| 327 | if (handoff_fd == -1) { |
| 328 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 329 | "Xquartz: Failed to connect to socket (try %d of %d)", |
| 330 | (int)try + 1, |
| 331 | (int)try_max); |
| 332 | continue; |
| 333 | } |
| 334 | |
| 335 | asl_log( |
| 336 | aslc, NULL, ASL_LEVEL_INFO, |
| 337 | "Xquartz: Handoff connection established (try %d of %d) on fd %d, \"%s\". Sending message.", |
| 338 | (int)try + 1, (int)try_max, handoff_fd, |
| 339 | handoff_socket_filename); |
| 340 | send_fd_handoff(handoff_fd, launchd_fd); |
| 341 | close(handoff_fd); |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* Count envp */ |
| 347 | for (envpc = 0; envp[envpc]; envpc++) ; |
| 348 | |
| 349 | /* We have fixed-size string lengths due to limitations in IPC, |
| 350 | * so we need to copy our argv and envp. |
| 351 | */ |
| 352 | newargv = (string_array_t)calloc((1 + argc), sizeof(string_t)); |
| 353 | newenvp = (string_array_t)calloc((1 + envpc), sizeof(string_t)); |
| 354 | |
| 355 | if (!newargv || !newenvp) { |
| 356 | /* Silence the clang static analyzer */ |
| 357 | free(newargv); |
| 358 | free(newenvp); |
| 359 | |
| 360 | asl_log(aslc, NULL, ASL_LEVEL_ERR, |
| 361 | "Xquartz: Memory allocation failure"); |
| 362 | return EXIT_FAILURE; |
| 363 | } |
| 364 | |
| 365 | for (i = 0; i < argc; i++) { |
| 366 | strlcpy(newargv[i], argv[i], STRING_T_SIZE); |
| 367 | } |
| 368 | for (i = 0; i < envpc; i++) { |
| 369 | strlcpy(newenvp[i], envp[i], STRING_T_SIZE); |
| 370 | } |
| 371 | |
| 372 | kr = start_x11_server(mp, newargv, argc, newenvp, envpc); |
| 373 | |
| 374 | free(newargv); |
| 375 | free(newenvp); |
| 376 | |
| 377 | if (kr != KERN_SUCCESS) { |
| 378 | asl_log(aslc, NULL, ASL_LEVEL_ERR, "Xquartz: start_x11_server: %s", |
| 379 | mach_error_string( |
| 380 | kr)); |
| 381 | return EXIT_FAILURE; |
| 382 | } |
| 383 | return EXIT_SUCCESS; |
| 384 | } |