bundle_trampoline.c (3393B)
1 /* Copyright (c) 2021 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 <assert.h> 30 #include <mach-o/dyld.h> 31 #include <libgen.h> 32 #include <spawn.h> 33 #include <sys/syslimits.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 38 /* We wnt XQuartz.app to inherit a login shell environment. This is handled by the X11.sh 39 * script which re-execs the main binary from a login shell environment. However, recent 40 * versions of macOS require that the main executable of an app be Mach-O for full system 41 * fidelity. 42 * 43 * Failure to do so results in two problems: 44 * 1) bash is seen as the responsible executable for Security & Privacy, and the user doesn't 45 * get prompted to allow filesystem access (https://github.com/XQuartz/XQuartz/issues/6). 46 * 2) The process is launched under Rosetta for compatability, which results in 47 * the subsequent spawn of the real executable under Rosetta rather than natively. 48 * 49 * This trampoline provides the mach-o needed by LaunchServices and TCC to satisfy those 50 * needs and simply execs the startup script which then execs the main binary. 51 */ 52 53 static char *executable_path() { 54 uint32_t bufsize = PATH_MAX; 55 char *buf = calloc(1, bufsize); 56 57 if (_NSGetExecutablePath(buf, &bufsize) == -1) { 58 free(buf); 59 buf = calloc(1, bufsize); 60 assert(_NSGetExecutablePath(buf, &bufsize) == 0); 61 } 62 63 return buf; 64 } 65 66 int main(int argc, char **argv, char **envp) { 67 char const * const executable_directory = dirname(executable_path()); 68 char *executable = NULL; 69 70 asprintf(&executable, "%s/X11.sh", executable_directory); 71 if (access(executable, X_OK) == -1) { 72 free(executable); 73 asprintf(&executable, "%s/X11", executable_directory); 74 } 75 assert(access(executable, X_OK) == 0); 76 77 argv[0] = executable; 78 79 posix_spawnattr_t attr; 80 assert(posix_spawnattr_init(&attr) == 0); 81 assert(posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETEXEC) == 0); 82 83 pid_t child_pid; 84 assert(posix_spawn(&child_pid, executable, NULL, &attr, argv, envp) == 0); 85 86 return EXIT_FAILURE; 87 }