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ios_system.m
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//
// ios_system.m
//
// Created by Nicolas Holzschuch on 17/11/2017.
// Copyright © 2017 N. Holzschuch. All rights reserved.
//
#import <UIKit/UIKit.h>
#include "ios_system.h"
// ios_system(cmd): Executes the command in "cmd". The goal is to be a drop-in replacement for system(), as much as possible.
// We assume cmd is the command. If vim has prepared '/bin/sh -c "(command -arguments) < inputfile > outputfile",
// it is easier to remove the "/bin/sh -c" part before calling ios_system than inside ios_system.
// See example in (iVim) os_unix.c
//
// ios_executable(cmd): returns true if the command is one of the commands defined in ios_system, and can be executed.
// This is because mch_can_exe (called by executable()) checks for the existence of binaries with the same name in the
// path. Our commands don't exist in the path.
//
// ios_popen(cmd, type): returns a FILE*, executes cmd, and thread_output into input of cmd (if type=="w") or
// the reverse (if type == "r").
#include <pthread.h>
#include <sys/stat.h>
#include <libgen.h> // for basename()
#include <dlfcn.h> // for dlopen()/dlsym()/dlclose()
#include <glob.h> // for wildcard expansion
// Sideloading: when you compile yourself, as opposed to uploading on the app store
// If true, all commands are enabled + debug messages if dylib not found.
// If false, you get a smaller set, but compliance with AppStore rules.
// *Must* be false in the main branch releases.
// Commands that can be enabled only if sideLoading: chgrp, chown, df, id, w.
bool sideLoading = false;
// Should the main thread be joined (which means it takes priority over other tasks)?
// Default value is true, which makes sense for shell-like applications.
// Should be set to false if significant user interaction is carried by the app and
// the app takes responsibility for waiting for the command to terminate.
bool joinMainThread = true;
static NSString* ios_bookmarkDictionaryName = @"bookmarkNames";
// Include file for getrlimit/setrlimit:
#include <sys/resource.h>
static struct rlimit limitFilesOpen;
extern void display_alert(NSString* title, NSString* message);
extern __thread int __db_getopt_reset;
__thread FILE* thread_stdin;
__thread FILE* thread_stdout;
__thread FILE* thread_stderr;
__thread void* thread_context;
FILE* ios_stdin(void) {
return thread_stdin;
}
FILE* ios_stdout(void) {
return thread_stdout;
}
FILE* ios_stderr(void) {
return thread_stderr;
}
void* ios_context(void) {
return thread_context;
}
// Parameters for each session. We can have multiple sessions running in parallel.
typedef struct _sessionParameters {
bool isMainThread; // are we on the first command?
char currentDir[MAXPATHLEN];
char previousDirectory[MAXPATHLEN];
char localMiniRoot[MAXPATHLEN];
pthread_t current_command_root_thread; // thread ID of first command
pthread_t lastThreadId; // thread ID of last command.
pthread_t mainThreadId; // thread ID of parent command, if any (e.g. vim, which starts "sh -c cd dir && flake8 file")
FILE* stdin;
FILE* stdout;
FILE* stderr;
FILE* tty;
const void* context;
int global_errno;
int numCommandsAllocated;
int numCommand;
char** commandName;
char columns[5];
char lines[5];
bool activePager;
} sessionParameters;
static void initSessionParameters(sessionParameters* sp) {
NSFileManager *fileManager = [[NSFileManager alloc] init];
sp->isMainThread = TRUE;
sp->current_command_root_thread = 0;
sp->lastThreadId = 0;
sp->mainThreadId = 0;
NSString* currentDirectory = [fileManager currentDirectoryPath];
strcpy(sp->currentDir, [currentDirectory UTF8String]);
strcpy(sp->previousDirectory, [currentDirectory UTF8String]);
sp->localMiniRoot[0] = 0;
sp->global_errno = 0;
sp->stdin = stdin;
sp->stdout = stdout;
sp->stderr = stderr;
sp->tty = stdin;
sp->context = nil;
sp->numCommandsAllocated = 10; // 10 slots available to store commands, will realloc if more needed.
sp->commandName = malloc(sizeof(char*) * sp->numCommandsAllocated);
for (int i = 0; i < sp->numCommandsAllocated; i++) {
sp->commandName[i] = malloc(sizeof(char) * NAME_MAX);
}
sp->commandName[0][0] = 0;
sp->numCommand = 0;
strcpy(sp->columns, "80");
strcpy(sp->lines, "80");
sp->activePager = FALSE;
}
void ios_setBookmarkDictionaryName(NSString* name) {
ios_bookmarkDictionaryName = name;
}
const char* ios_getBookmarkedVersion(const char* p) {
// p is a directory. Get the bookmarked version to make it shorter:
NSString* pathString = [NSString stringWithUTF8String:p];
NSString* privatePrefix = @"/private";
if ([pathString hasPrefix:privatePrefix]) {
pathString = [pathString substringFromIndex:[privatePrefix length]];
}
NSString *homePath;
homePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByDeletingLastPathComponent];
if ([homePath hasPrefix:privatePrefix]) {
homePath = [homePath substringFromIndex:[privatePrefix length]];
}
// NSLog(@"ios_getBookmarkedVersion: %s %s", homePath.UTF8String, pathString.UTF8String);
if ([pathString hasPrefix:homePath]) {
pathString = [pathString stringByReplacingOccurrencesOfString:homePath withString:@"~"];
return pathString.UTF8String;
}
if (ios_bookmarkDictionaryName == nil) {
return p;
}
NSDictionary *tildeExpansionDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:ios_bookmarkDictionaryName];
if (tildeExpansionDictionary == nil) {
return p;
}
NSString* foundString = @"";
for (NSString* bookmark in tildeExpansionDictionary) {
NSString* bookmarkPath = tildeExpansionDictionary[bookmark];
if ([bookmarkPath hasPrefix:privatePrefix]) {
bookmarkPath = [bookmarkPath substringFromIndex:[privatePrefix length]];
}
if ([pathString hasPrefix:bookmarkPath]) {
NSString* testString = [pathString stringByReplacingOccurrencesOfString:bookmarkPath withString:[@"~" stringByAppendingString: bookmark]];
if ((foundString.length == 0) || (testString.length < foundString.length))
foundString = testString;
}
}
if (foundString.length > 0)
return foundString.UTF8String;
return p;
}
static NSMutableDictionary* sessionList;
static NSMutableDictionary* aliasDictionary;
// pointer to sessionParameters. thread-local variable so the entire system is thread-safe.
// The sessionParameters pointer is shared by all threads in the same session.
static __thread sessionParameters* currentSession = NULL;
// Python3 multiple interpreters:
// limit to 6 = 1 kernel, 4 notebooks, one extra.
static const int MaxPythonInterpreters = 6; // const so we can allocate an array
int numPythonInterpreters = MaxPythonInterpreters; // Apps can overwrite this
static bool PythonIsRunning[MaxPythonInterpreters];
static int currentPythonInterpreter = 0;
static bool showPythonInterpreterAlert = true;
// Same with perl:
static const int MaxPerlInterpreters = 4; // const so we can allocate an array
// cpan starts perl Makefile.PL, which starts perl -e print Version, so at least 3.
int numPerlInterpreters = MaxPerlInterpreters; // Apps can overwrite this
static bool PerlIsRunning[MaxPerlInterpreters];
static int currentPerlInterpreter = 0;
// same with TeX, with a twist:
static const int MaxTeXInterpreters = 2; // const so we can allocate an array
// (La)TeX can start another (La)TeX command for TikZ
int numTeXInterpreters = MaxTeXInterpreters; // Apps can overwrite this
static bool TeXIsRunning[MaxTeXInterpreters];
static int currentTeXInterpreter = 0;
NSArray *TeXcommands = nil; // initialized later
// Multiple dash:
// limit to 6 (for now)
static const int MaxDashCommands = 6; // const so we can allocate an array
int numDashCommands = MaxDashCommands; // Apps can overwrite this
static bool dashIsRunning[MaxDashCommands];
static int currentDashCommand = 0;
// multiple ssh (limit to 2):
static const int MaxSshCommands = 2; // const so we can allocate an array
int numSshCommands = MaxSshCommands; // Apps can overwrite this
static bool sshIsRunning[MaxSshCommands];
static int currentSshCommand = 0;
// prevent the user from running multiple curl commands too:
static bool curlIsRunning = false;
// pointers for sh sessions:
char* sh_session = "sh_session";
// replace system-provided exit() by our own:
void ios_exit(int n) {
if (currentSession != NULL) {
currentSession->global_errno = n;
}
pthread_exit(NULL);
}
void set_session_errno(int n) {
if (currentSession != NULL) {
currentSession->global_errno = n;
}
}
// Replace standard abort and exit functions with ours:
// We also do this using #define, but this is for the unmodified code.
void abort(void) {
ios_exit(1);
}
void exit(int n) {
ios_exit(n);
}
void _exit(int n) {
ios_exit(n);
}
//
int canSetSignal() {
if (currentSession == NULL) {
return 1;
}
char* sessionId = (char*)currentSession->context;
if (strcmp(sessionId, "inExtension") == 0) {
return 0;
}
return 1;
}
#undef signal
sig_t ios_signal(int value, sig_t function) {
// intercept calls to signal, prevent signal from doing anything when running in-extension.
// So that an in-extension command cannot break the signal handling from an in-app command.
if (canSetSignal()) {
return signal(value, function);
} else {
return NULL;
}
}
NSString *ios_getLogicalPWD(const void* sessionId) {
id sessionKey = @((NSUInteger)sessionId);
if (sessionList == nil) {
return nil;
}
sessionParameters *session = (sessionParameters*)[[sessionList objectForKey: sessionKey] pointerValue];
if (session == nil) {
return nil;
}
return @(session->currentDir);
}
#undef getenv
void ios_setWindowSize(int width, int height, const void* sessionId) {
// You can set the window size for a session that is not currently running (e.g. because "sh_session" is running).
// So we set it without calling ios_switchSession:
sessionParameters* resizedSession;
id sessionKey = @((NSUInteger)sessionId);
if (sessionList == nil) {
return;
}
resizedSession = (sessionParameters*)[[sessionList objectForKey: sessionKey] pointerValue];
if (resizedSession == nil) {
return;
}
sprintf(resizedSession->columns, "%d", MIN(width, 9999));
sprintf(resizedSession->lines, "%d", MIN(height, 9999));
// Also send SIGWINCH to the main thread of resizedSession:
if (resizedSession->current_command_root_thread != NULL) {
pthread_kill(resizedSession->current_command_root_thread, SIGWINCH);
}
if (resizedSession->lastThreadId != NULL) {
pthread_kill(resizedSession->lastThreadId, SIGWINCH);
}
if (resizedSession->mainThreadId != NULL) {
pthread_kill(resizedSession->mainThreadId, SIGWINCH);
}
}
extern char* libc_getenv(const char* variableName);
static char randomValue[6];
char * ios_getenv(const char *name) {
// intercept calls to getenv("COLUMNS") / getenv("LINES")
if (strcmp(name, "COLUMNS") == 0) {
return currentSession->columns;
}
if (strcmp(name, "LINES") == 0) {
return currentSession->lines;
}
if (strcmp(name, "ROWS") == 0) {
return currentSession->lines;
}
if (strcmp(name, "PWD") == 0) {
return currentSession->currentDir;
}
if (strcmp(name, "RANDOM") == 0) {
sprintf(randomValue, "%d", random()&0x7FFF);
return randomValue;
}
return libc_getenv(name);
}
void ios_IsMainThread(bool value) {
currentSession->isMainThread = value;
}
int ios_getCommandStatus(void) {
if (currentSession != NULL) return currentSession->global_errno;
else return 0;
}
extern const char* ios_progname(void) {
if (currentSession != NULL) {
if (currentSession->numCommand <= 0)
return currentSession->commandName[0];
else
return currentSession->commandName[currentSession->numCommand - 1];
}
else return getprogname();
}
const char* ios_expandtilde(const char *login) {
// expand "~something" with the content of userPreference dictionary (to be set by each app)
// About the same behaviour as:
// struct passwd *pw = getpwnam(name);
// return pw ? pw->pw_dir : 0;
NSDictionary *tildeExpansionDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:ios_bookmarkDictionaryName];
if (tildeExpansionDictionary != nil) {
NSString* name = [NSString stringWithUTF8String:login];
NSString* expandedPath = tildeExpansionDictionary[name];
if (expandedPath != nil) {
return [expandedPath UTF8String];
}
}
return NULL;
}
typedef struct _functionParameters {
int argc;
char** argv;
char** argv_ref;
int (*function)(int ac, char** av);
FILE *stdin, *stdout, *stderr;
void* context;
void* dlHandle;
bool isPipeIn;
bool isPipeOut;
bool isPipeErr;
bool backgroundCommand;
int numInterpreter;
bool storeRootThread;
sessionParameters* session;
} functionParameters;
extern pthread_mutex_t pid_mtx;
extern _Atomic(int) cleanup_counter;
extern void ios_releaseBackgroundThread(pthread_t thread);
extern void startedPreparingWebAssemblyCommand(void);
static void cleanup_function(void* parameters) {
// This function is called when pthread_exit() or ios_kill() is called
pthread_t current_thread = pthread_self();
functionParameters *p = (functionParameters *) parameters;
bool backgroundCommand = p->backgroundCommand;
char* commandName = p->argv[0];
char* currentSessionCommandName = NULL;
bool toNonInteractive = false;
if (currentSession->numCommand <= 0)
currentSessionCommandName = currentSession->commandName[0];
else
currentSessionCommandName = currentSession->commandName[currentSession->numCommand - 1];
NSLog(@"cleanup_function: %s thread_id %x pid: %d stdin %d stdout %d stderr %d isPipeOut %d", commandName, current_thread, ios_currentPid(), fileno(p->stdin), fileno(p->stdout), fileno(p->stderr), p->isPipeOut);
NSLog(@"currentSession->commandName: %s root_thread: %x", currentSessionCommandName, currentSession->current_command_root_thread);
NSLog(@"Num commands stored: %d", currentSession->numCommand);
if ((strcmp(commandName, "less") == 0) || (strcmp(commandName, "more") == 0)) {
if ((strlen(currentSessionCommandName) > 0)
&& (strcmp(currentSessionCommandName, "less") != 0)
&& (strcmp(currentSessionCommandName, "more") != 0)) {
// Command was "root_command | sthg | less". We need to kill root command.
// If less itself started another command, then currentSession->commandName is "".
// Unless less / more was started as a pager, in which case don't kill root command (e.g. for man and ipython help).
pthread_kill(currentSession->current_command_root_thread, SIGINT);
while (fgetc(thread_stdin) != EOF) { } // flush input, otherwise previous command gets blocked.
} else {
// but for python or ipython help(), flush the content of stdin:
if ((currentSession->numCommand > 1) &&
((strncmp(currentSession->commandName[currentSession->numCommand - 2], "ipython", 7) == 0) ||
(strncmp(currentSession->commandName[currentSession->numCommand - 2], "isympy", 6) == 0) ||
(strncmp(currentSession->commandName[currentSession->numCommand - 2], "python", 6) == 0))) {
while (fgetc(thread_stdin) != EOF) { } // flush input to help() command
if (strncmp(currentSession->commandName[currentSession->numCommand - 2], "python", 6) == 0) {
toNonInteractive = true;
}
}
}
currentSession->activePager = FALSE;
}
// If the command was started as a pipe, we wait for the first command to finish sending data
// There is an exception for ssh, which can be started by scp or sftp. They will wait for it.
// Another exception for "dash -c": one command is reading its output
if ((!joinMainThread) && p->isPipeOut
&& (strcmp(commandName, "ssh") != 0) // not ssh
&& (! ((strcmp(commandName, "dash") == 0) && (p->argc >= 2) && (strcmp(p->argv_ref[1], "-c") == 0)))) { // not "dash -c something"
if (currentSession->current_command_root_thread != 0) {
if (currentSession->current_command_root_thread != current_thread) {
NSLog(@"Thread %x is waiting for root_thread of currentSession: %x \n", current_thread, currentSession->current_command_root_thread);
while ((currentSession->current_command_root_thread != 0) && (currentSession->current_command_root_thread != current_thread)) {
fflush(thread_stdout);
fflush(thread_stderr);
}
NSLog(@"Thread %x is done waiting for root_thread of currentSession: %x \n", current_thread, currentSession->current_command_root_thread);
} else {
NSLog(@"Terminating root_thread of currentSession %x \n", current_thread);
currentSession->current_command_root_thread = 0;
}
}
}
fcntl(fileno(thread_stdin), F_SETNOSIGPIPE);
fcntl(fileno(thread_stdout), F_SETNOSIGPIPE);
fcntl(fileno(thread_stderr), F_SETNOSIGPIPE);
fflush(thread_stdin);
fflush(thread_stdout);
fflush(thread_stderr);
// release parameters:
NSLog(@"Terminating command: %s thread_id %x stdin %d stdout %d stderr %d isPipeOut %d", commandName, current_thread, fileno(p->stdin), fileno(p->stdout), fileno(p->stderr), p->isPipeOut);
// Specific to run multiple python3 interpreters:
NSString* commandNameString = [NSString stringWithCString: commandName encoding:NSUTF8StringEncoding];
// Can we close stdin too?
bool mustCloseStdin = fileno(p->stdin) != fileno(stdin);
if (strncmp(commandName, "python", 6) == 0) {
// It could be one of the multiple python3 interpreters
PythonIsRunning[p->numInterpreter] = false;
mustCloseStdin = false;
}
// Same with multiple perl or TeX interpreters:
else if (strncmp(commandName, "perl", 4) == 0) {
NSLog(@"Ending a Perl interpreter: %d", p->numInterpreter);
PerlIsRunning[p->numInterpreter] = false;
} else if ([TeXcommands containsObject: commandNameString]) {
NSLog(@"Ending a TeX command: %d", p->numInterpreter);
TeXIsRunning[p->numInterpreter] = false;
} else if (strcmp(commandName, "dash") == 0) {
NSLog(@"Ending a dash command: %d", p->numInterpreter);
dashIsRunning[p->numInterpreter] = false;
} else if ((strcmp(commandName, "ssh") == 0) || (strcmp(commandName, "scp") == 0) || (strcmp(commandName, "sftp") == 0)) {
NSLog(@"Ending a ssh command: %d", p->numInterpreter);
sshIsRunning[p->numInterpreter] = false;
} else if (strcmp(commandName, "curl") == 0) {
NSLog(@"Ending a curl command.");
curlIsRunning = false;
}
if (currentSession->numCommand > 0)
currentSession->numCommand -= 1;
else
currentSession->commandName[0][0] = 0;
// if (strcmp(currentSession->commandName, commandName) == 0) {
// currentSession->commandName[0] = 0;
// }
bool isSh = strcmp(p->argv[0], "sh") == 0;
bool isWasm = strcmp(p->argv[0], "wasm") == 0;
for (int i = 0; i < p->argc; i++) free(p->argv_ref[i]);
free(p->argv_ref);
free(p->argv);
bool isLastThread = (currentSession->lastThreadId == current_thread);
bool mustCloseStderr = (fileno(p->stderr) != fileno(stderr)) && (fileno(p->stderr) != fileno(p->stdout)) && (fileno(p->stdout) != fileno(p->stdin));
if (!isSh) {
mustCloseStderr &= p->isPipeErr;
if (currentSession != nil) {
mustCloseStderr &= fileno(p->stderr) != fileno(currentSession->stderr);
mustCloseStderr &= fileno(p->stderr) != fileno(currentSession->stdout);
}
}
// Some programs stop waiting as soon as stdout/stderr close (which makes sense)
// This fclose does close the fileno, but I find it re-opened later.
cleanup_counter++;
while (pthread_mutex_trylock(&pid_mtx) != 0) { } // Someone else has the lock, so we wait.
pthread_mutex_unlock(&pid_mtx);
if (mustCloseStderr) {
NSLog(@"Closing stderr (mustCloseStderr): %d \n", fileno(p->stderr));
int res = fclose(p->stderr);
}
// In some cases, we find that stdout is equal to stdin after executing the command. We should not close stdin!
bool mustCloseStdout = (fileno(p->stdout) != fileno(stdout)) && (fileno(p->stdout) != fileno(p->stdin));
if (!isSh) {
mustCloseStdout &= p->isPipeOut;
if (currentSession != nil) {
mustCloseStdout &= fileno(p->stdout) != fileno(currentSession->stdout);
}
}
if (mustCloseStdout) {
int fd = fileno(p->stdout);
NSLog(@"Closing stdout (mustCloseStdout): %d \n", fileno(p->stdout));
int res = fclose(p->stdout);
// Add close(fd) as well?
NSLog(@"Result of closing stdout (mustCloseStdout): %d flag: %d\n", res, fcntl(fd, F_GETFD, 0));
}
if (!isSh) {
mustCloseStdin &= p->isPipeIn;
if (currentSession != nil) {
mustCloseStdin &= fileno(p->stdin) != fileno(currentSession->stdin);
}
if (isWasm) {
// Don't close stdin for Wasm commands piped into others, but do it for files
char filePath[MAXPATHLEN];
if (fcntl(fileno(p->stdin), F_GETPATH, filePath) < 0)
mustCloseStdin &= false;
}
// commands started by Python: Python will close stdin (Lua and Perl? not broken, AFAIK)
if ((currentSession->numCommand > 0) && (strncmp(currentSession->commandName[currentSession->numCommand - 1], "python", 6) == 0)) {
// NSLog(@"Command started by Python, not closing stdin: %d \n", fileno(p->stdin));
mustCloseStdin &= false;
}
}
if (mustCloseStdin) {
NSLog(@"Closing stdin (mustCloseStdin): %d \n", fileno(p->stdin));
int res = fclose(p->stdin);
}
if ((p->dlHandle != RTLD_SELF) && (p->dlHandle != RTLD_MAIN_ONLY)
&& (p->dlHandle != RTLD_DEFAULT) && (p->dlHandle != RTLD_NEXT))
dlclose(p->dlHandle);
free(parameters); // This was malloc'ed in ios_system
if (isLastThread) {
NSLog(@"Terminating lastthread of currentSession %x lastThreadId %x pid: %d\n", current_thread, currentSession->lastThreadId, ios_currentPid());
currentSession->lastThreadId = 0;
} else {
NSLog(@"Current thread %x lastthread %x pid: %d\n", pthread_self(), currentSession->lastThreadId, ios_currentPid());
}
if (backgroundCommand) {
// If it's a background command, call ios_releaseBackgroundThread:
// NSLog(@"Releasing a backgroundCommand\n");
ios_releaseBackgroundThread(current_thread);
} else {
if (toNonInteractive) {
ios_stopInteractive();
}
ios_releaseThread(current_thread);
}
if (currentSession->current_command_root_thread == current_thread) {
currentSession->current_command_root_thread = 0;
}
if (currentSession->mainThreadId == current_thread) {
currentSession->mainThreadId = 0;
}
cleanup_counter--;
NSLog(@"returning from cleanup_function, session: %s\n", (char*)currentSession->context);
}
// Avoir calling crash_handler several times:
static __thread bool crash_handler_called = false;
void crash_handler(int sig) {
if (thread_stderr == NULL) thread_stderr = stderr;
if (!crash_handler_called) {
crash_handler_called = true;
if (sig == SIGSEGV) {
fputs("segmentation fault\n", thread_stderr);
} else if (sig == SIGBUS) {
fputs("bus error\n", thread_stderr);
} else if (sig == SIGPIPE) {
fputs("pipe error\n", thread_stderr);
return;
}
ios_exit(1);
}
}
static void* run_function(void* parameters) {
functionParameters *p = (functionParameters *) parameters;
NSLog(@"Storing thread_id: %x pid: %d isPipeOut: %x isPipeErr: %x stdin %d stdout %d stderr %d command= %s\n", pthread_self(), ios_currentPid(), p->isPipeOut, p->isPipeErr,
(p->stdin == nil) ? -1 : fileno(p->stdin),
(p->stdout == nil) ? -1 : fileno(p->stdout),
(p->stderr == nil) ? -1 : fileno(p->stderr), p->argv[0]);
ios_storeThreadId(pthread_self());
if (p->storeRootThread && (p->session != NULL)) {
NSLog(@"Storing thread_id: %x as root_thread\n", pthread_self());
p->session->current_command_root_thread = pthread_self();
}
// NSLog(@"Starting command: %s thread_id %x", p->argv[0], pthread_self());
// re-initialize for getopt:
// TODO: move to __thread variable for optind too
optind = 1;
opterr = 1;
optreset = 1;
__db_getopt_reset = 1;
thread_stdin = p->stdin;
thread_stdout = p->stdout;
thread_stderr = p->stderr;
thread_context = p->context;
currentSession = p->session;
if ((strcmp(p->argv[0], "less") == 0) || (strcmp(p->argv[0], "more") == 0)) {
if (currentSession != nil) currentSession->activePager = TRUE;
}
signal(SIGSEGV, crash_handler);
signal(SIGBUS, crash_handler);
signal(SIGPIPE, crash_handler);
// Because some commands change argv, keep a local copy for release.
p->argv_ref = (char **)malloc(sizeof(char*) * (p->argc + 1));
for (int i = 0; i < p->argc; i++) p->argv_ref[i] = p->argv[i];
pthread_cleanup_push(cleanup_function, parameters);
@try
{
int retval = p->function(p->argc, p->argv);
if (currentSession != nil) currentSession->global_errno = retval;
}
@catch (NSException *exception)
{
// Print exception information.
NSLog( @"NSException caught" );
NSLog( @"Name: %@", exception.name);
NSLog( @"Reason: %@", exception.reason );
fprintf(thread_stderr, "Command %s was interrupted because it triggered a system exception: %s: %s\n", p->argv[0], exception.name.UTF8String, exception.reason.UTF8String);
return NULL;
}
@finally
{
// Cleanup, in both success and fail cases
pthread_cleanup_pop(1);
return NULL;
}
}
static NSString* miniRoot = nil; // limit operations to below a certain directory (~, usually).
static NSArray<NSString*> *allowedPaths = nil;
static NSDictionary *commandList = nil;
NSArray *backgroundCommandList = nil;
// do recompute directoriesInPath only if $PATH has changed
static NSString* fullCommandPath = @"";
static NSArray *directoriesInPath;
void initializeEnvironment(void) {
// setup a few useful environment variables
// Initialize paths for application files, including history.txt and keys
NSString *docsPath;
if (miniRoot == nil) docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
else docsPath = miniRoot;
// Where the executables are stored: $PATH + ~/Library/bin + ~/Documents/bin
// Add content of old PATH to this. PATH *is* defined in iOS, surprising as it may be.
// I'm not going to erase it, so we just add ourselves.
// Sometimes, we go through main several times, so make sure we only append to PATH once
NSString* checkingPath = [NSString stringWithCString:getenv("PATH") encoding:NSUTF8StringEncoding];
if (! [fullCommandPath isEqualToString:checkingPath]) {
fullCommandPath = checkingPath;
}
if (![fullCommandPath containsString:@"Documents/bin"]) {
NSString *binPath = [docsPath stringByAppendingPathComponent:@"bin"];
fullCommandPath = [[binPath stringByAppendingString:@":"] stringByAppendingString:fullCommandPath];
setenv("PATH", fullCommandPath.UTF8String, 1); // 1 = override existing value
}
setenv("APPDIR", [[NSBundle mainBundle] resourcePath].UTF8String, 1);
setenv("PATH_LOCALE", docsPath.UTF8String, 0); // CURL config in ~/Documents/ or [Cloud Drive]/
setenv("TERM", "xterm", 1); // 1 = override existing value
setenv("TMPDIR", NSTemporaryDirectory().UTF8String, 0); // tmp directory
setenv("CLICOLOR", "1", 1);
setenv("LSCOLORS", "ExFxBxDxCxegedabagacad", 0); // colors for ls on black background
// We can't write in $HOME so we need to set the position of config files:
setenv("SSH_HOME", docsPath.UTF8String, 0); // SSH keys in ~/Documents/.ssh/ or [Cloud Drive]/.ssh
setenv("DIG_HOME", docsPath.UTF8String, 0); // .digrc is in ~/Documents/.digrc or [Cloud Drive]/.digrc
setenv("CURL_HOME", docsPath.UTF8String, 0); // CURL config in ~/Documents/ or [Cloud Drive]/
setenv("CURLOPT_SSH_KNOWNHOSTS", [docsPath stringByAppendingPathComponent:@".ssh/known_hosts"].UTF8String, 0);
setenv("SSL_CERT_FILE", [docsPath stringByAppendingPathComponent:@"cacert.pem"].UTF8String, 0); // SLL cacert.pem in ~/Documents/cacert.pem or [Cloud Drive]/cacert.pem
// iOS already defines "HOME" as the home dir of the application
for (int i = 0; i < MaxPythonInterpreters; i++) PythonIsRunning[i] = false;
for (int i = 0; i < MaxPerlInterpreters; i++) PerlIsRunning[i] = false;
NSString *libPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
// environment variables for Python:
setenv("PYTHONHOME", libPath.UTF8String, 0); // Python files are in ~/Library/lib/python[23].x/
// XDG setup directories (~/Library/Caches, ~/Library/Preferences):
setenv("XDG_CACHE_HOME", [libPath stringByAppendingPathComponent:@"Caches"].UTF8String, 0);
setenv("XDG_CONFIG_HOME", [libPath stringByAppendingPathComponent:@"Preferences"].UTF8String, 0);
setenv("XDG_STATE_HOME", libPath.UTF8String, 0);
setenv("XDG_DATA_HOME", libPath.UTF8String, 0);
// if we use Python, we define a few more environment variables:
setenv("PYTHONEXECUTABLE", "python3", 0); // Python executable name for python3
setenv("PYZMQ_BACKEND", "cffi", 0);
// Configuration files are in $HOME (and hidden)
setenv("JUPYTER_CONFIG_DIR", [docsPath stringByAppendingPathComponent:@".jupyter"].UTF8String, 0);
setenv("IPYTHONDIR", [docsPath stringByAppendingPathComponent:@".ipython"].UTF8String, 0);
setenv("MPLCONFIGDIR", [docsPath stringByAppendingPathComponent:@".config/matplotlib"].UTF8String, 0);
// hg config file in ~/Documents/.hgrc
setenv("HGRCPATH", [docsPath stringByAppendingPathComponent:@".hgrc"].UTF8String, 0);
if (![fullCommandPath containsString:@"Library/bin"]) {
NSString *binPath = [libPath stringByAppendingPathComponent:@"bin"];
fullCommandPath = [[binPath stringByAppendingString:@":"] stringByAppendingString:fullCommandPath];
}
if (!sideLoading) {
// If we're not sideloading, executeables will also be in the Application directory
NSString *mainBundlePath = [[NSBundle mainBundle] resourcePath];
NSString *mainBundleLibPath = [mainBundlePath stringByAppendingPathComponent:@"Library"];
// if we're not sideloading, all "executable" files are in the AppDir:
// $APPDIR/Library/bin3
NSString *binPath = [mainBundleLibPath stringByAppendingPathComponent:@"bin3"];
fullCommandPath = [[binPath stringByAppendingString:@":"] stringByAppendingString:fullCommandPath];
// $APPDIR/Library/bin
binPath = [mainBundleLibPath stringByAppendingPathComponent:@"bin"];
fullCommandPath = [[binPath stringByAppendingString:@":"] stringByAppendingString:fullCommandPath];
// $APPDIR/bin
binPath = [mainBundlePath stringByAppendingPathComponent:@"bin"];
fullCommandPath = [[binPath stringByAppendingString:@":"] stringByAppendingString:fullCommandPath];
}
directoriesInPath = [fullCommandPath componentsSeparatedByString:@":"];
setenv("PATH", fullCommandPath.UTF8String, 1); // 1 = override existing value
// Store the maximum number of file descriptors allowed:
getrlimit(RLIMIT_NOFILE, &limitFilesOpen);
// Initialize the array with the name of TeX commands (this might be too many commands):
TeXcommands = @[@"amstex", @"cslatex", @"csplain", @"eplain", @"etex", @"jadetex", @"latex", @"mex", @"mllatex", @"mltex", @"pdfsclatex", @"pdfcsplain", @"pdfetex", @"pdfjadetex", @"pdflatex", @"pdfmex", @"pdftex", @"pdfxmltex", @"tex", @"texsis", @"utf8mex", @"xmltex", @"texlua", @"texluac", @"dvilualatex", @"dviluatex", @"lualatex", @"luatex", @"luahbtex", @"mptopdf", @"optex",
@"xetex", @"xelatex", @"dvipdfmx", @"xdvipdfmx",
@"amstexA", @"cslatexA", @"csplainA", @"eplainA", @"etexA", @"jadetexA", @"latexA", @"mexA", @"mllatexA", @"mltexA", @"pdfsclatexA", @"pdfcsplainA", @"pdfetexA", @"pdfjadetexA", @"pdflatexA", @"pdfmexA", @"pdftexA", @"pdfxmltexA", @"texA", @"texsisA", @"utf8mexA", @"xmltexA", @"texluaA", @"texluacA", @"dvilualatexA", @"dviluatexA", @"lualatexA", @"luatexA", @"luahbtexA", @"mptopdfA", @"optexA",
@"xetexA", @"xelatexA", @"dvipdfmxA", @"xdvipdfmxA"];
}
NSString * pathJoin(NSString * segmentA, NSString * segmentB);
static char* unquoteArgument(char* argument);
static char* parseArgument(char* argument, char* command) {
// expand all environment variables, convert "~" to $HOME (only if localFile)
// we also pass the shell command for some specific behaviour (don't do this for that command)
NSString* argumentString = [NSString stringWithCString:argument encoding:NSUTF8StringEncoding];
// NSLog(@"parsing argument, argumentString= %s", argumentString.UTF8String);
// If command == "export", first extract the value string here.
NSString* variableName;
if (strcmp(command, "export") == 0) {
char* equalSign=strchr(argument,'=');
if (equalSign && (strlen(equalSign) > 0)) {
char* argumentCString=equalSign+1;
argumentCString = unquoteArgument(argumentCString);
variableName = [argumentString substringToIndex:(equalSign - argument)];
argumentString = [NSString stringWithCString:argumentCString encoding:NSUTF8StringEncoding];
// NSLog(@"parsing argument, variable name= %s argument= %s", variableName.UTF8String, argumentString.UTF8String);
} else {
// No equal sign, or nothing after. export_main will take care of this.
return argument;
}
}
// 1) expand environment variables, + "~" (not wildcards ? and *)
bool cannotExpand = false;
while ([argumentString containsString:@"$"] && !cannotExpand) {
// It has environment variables inside. Work on them one by one.
// position of first "$" sign:
NSRange r1 = [argumentString rangeOfString:@"$"];
// position of first "/" after this $ sign:
NSRange r2 = [argumentString rangeOfString:@"/" options:NULL range:NSMakeRange(r1.location + r1.length, [argumentString length] - r1.location - r1.length)];
// position of first ":" after this $ sign:
NSRange r3 = [argumentString rangeOfString:@":" options:NULL range:NSMakeRange(r1.location + r1.length, [argumentString length] - r1.location - r1.length)];
if ((r2.location == NSNotFound) && (r3.location == NSNotFound)) r2.location = [argumentString length];
else if ((r2.location == NSNotFound) || (r3.location < r2.location)) r2.location = r3.location;
NSRange rSub = NSMakeRange(r1.location + r1.length, r2.location - r1.location - r1.length);
NSString *variable_string = [argumentString substringWithRange:rSub];
const char* variable = ios_getenv([variable_string UTF8String]);
if (variable) {
// Okay, so this one exists.
variable_string = [[NSString stringWithCString:"$" encoding:NSUTF8StringEncoding] stringByAppendingString:variable_string];
NSString* replacement_string = [NSString stringWithCString:variable encoding:NSUTF8StringEncoding];
argumentString = [argumentString stringByReplacingOccurrencesOfString:variable_string withString:replacement_string];
if ([replacement_string containsString:variable_string]) // avoid an infinite loop here
cannotExpand = true;
} else cannotExpand = true; // found a variable we can't expand. stop trying for this argument
}
// 2) Tilde conversion: replace "~" with $HOME
// If there are multiple users on iOS, this code will need to be changed.
// We also expand ~bookmarkName to the path for that bookmark.
// 2a) ~ expansion. (old behaviour, kept as is for compatibility)
if([argumentString hasPrefix:@"~"]) {
// So it begins with "~". We can't use stringByExpandingTildeInPath because apps redefine HOME
NSString* replacement_string;
if (miniRoot == nil)
replacement_string = [NSString stringWithCString:(getenv("HOME")) encoding:NSUTF8StringEncoding];
else replacement_string = miniRoot;
if (([argumentString hasPrefix:@"~/"]) || ([argumentString hasPrefix:@"~:"]) || ([argumentString length] == 1)) {
NSString* test_string = @"~";
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange(0, 1)];
} else {
// 2b) expand "~something" with the content of userPreference dictionary (to be set by each app)
NSDictionary *tildeExpansionDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:ios_bookmarkDictionaryName];
if (tildeExpansionDictionary != nil) {
NSCharacterSet* separators = [NSCharacterSet characterSetWithCharactersInString:@":/"];
NSArray<NSString*>* components = [argumentString componentsSeparatedByCharactersInSet:separators];
NSString* name = [components[0] substringFromIndex:1]; // remove the "~"
NSString* expandedPath = tildeExpansionDictionary[name];
if (expandedPath != nil) {
argumentString = [argumentString stringByReplacingOccurrencesOfString:components[0] withString:expandedPath options:NULL range:NSMakeRange(0, [components[0] length])];
}
}
}
}
// Also convert ":~something" in PATH style variables
// We don't use these yet, but we could.
// We do this expansion only for setenv and export
if ((strcmp(command, "setenv") == 0) || (strcmp(command, "export") == 0)) {
// This is something we need to avoid if the command is "scp" or "sftp"
if ([argumentString containsString:@":~"]) {
NSString* homeDir;
if (miniRoot == nil) homeDir = [NSString stringWithCString:(getenv("HOME")) encoding:NSUTF8StringEncoding];
else homeDir = miniRoot;
// Only 1 possibility: ":~" (same as $HOME)
if (homeDir.length > 0) {
NSString* replacement_string = [@":" stringByAppendingString:homeDir];
if ([argumentString containsString:@":~/"]) {
NSString* test_string = @":~/";
replacement_string = [replacement_string stringByAppendingString:[NSString stringWithCString:"/" encoding:NSUTF8StringEncoding]];
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string];
} else if ([argumentString hasSuffix:@":~"]) {
NSString* test_string = @":~";
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange([argumentString length] - 2, 2)];
} else if ([argumentString hasSuffix:@":"]) {
NSString* test_string = @":";
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange([argumentString length] - 2, 2)];
}
}
NSDictionary *tildeExpansionDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:ios_bookmarkDictionaryName];
if (tildeExpansionDictionary != nil) {
// TODO: add :~bookmarkName/ :~bookmarkName
NSArray<NSString*>* components = [argumentString componentsSeparatedByString:@":~"];
NSString* result = components[0];
for (int i = 1; i < components.count; i++) {
NSString* stringToAdd = components[i];
NSArray<NSString*>* names = [components[i] componentsSeparatedByString:@"/"];
NSString* test_string = names[0];
NSString* replacement_string = tildeExpansionDictionary[names[0]];
if (replacement_string != nil) {
// we found a name to expand
stringToAdd = [stringToAdd stringByReplacingOccurrencesOfString:test_string withString:replacement_string];
result = [[result stringByAppendingString:@":"] stringByAppendingString:stringToAdd];
} else {
result = [[result stringByAppendingString:@":~"] stringByAppendingString:stringToAdd];
}
}
argumentString = result;
}
}
}
if ([argumentString hasPrefix:@"../"] || [argumentString hasPrefix:@"./.."] || [argumentString isEqualToString:@".."]) {
argumentString = pathJoin(@(currentSession->currentDir), argumentString);
}
if (strcmp(command, "export") == 0) {
argumentString = [[variableName stringByAppendingString:@"="] stringByAppendingString:argumentString];
}
const char* newArgument = [argumentString UTF8String];
// NSLog(@"After parsing: %s", newArgument);
if (strcmp(argument, newArgument) == 0) return argument; // nothing changed
// Make sure the argument is reallocated, so it can be free-ed
char* returnValue = realloc(argument, strlen(newArgument) + 1);
strcpy(returnValue, newArgument);
return returnValue;
}
static const char* ios_expandFilename(const char *filename) {
// expand a filename for opening if it begins with "~" or contains an environment variable
if (strlen(filename) == 0) return filename;
NSString* nameString = [NSString stringWithUTF8String:filename];
if([nameString hasPrefix:@"~"]) {
// So it begins with "~". We can't use stringByExpandingTildeInPath because apps redefine HOME
NSString* replacement_string;
if (miniRoot == nil)
replacement_string = [NSString stringWithCString:(getenv("HOME")) encoding:NSUTF8StringEncoding];
else replacement_string = miniRoot;
if (([nameString hasPrefix:@"~/"]) || ([nameString length] == 1)) {
NSString* test_string = @"~";
nameString = [nameString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange(0, 1)];
} else {
// 2b) expand "~something" with the content of userPreference dictionary (to be set by each app)
NSDictionary *tildeExpansionDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:ios_bookmarkDictionaryName];
if (tildeExpansionDictionary != nil) {
NSCharacterSet* separators = [NSCharacterSet characterSetWithCharactersInString:@":/"];
NSArray<NSString*>* components = [nameString componentsSeparatedByCharactersInSet:separators];
NSString* name = [components[0] substringFromIndex:1]; // remove the "~"
NSString* expandedPath = tildeExpansionDictionary[name];
if (expandedPath != nil) {
nameString = [nameString stringByReplacingOccurrencesOfString:components[0] withString:expandedPath options:NULL range:NSMakeRange(0, [components[0] length])];
}
}
}
}
bool cannotExpand = false;
while ([nameString containsString:@"$"] && !cannotExpand) {
// It has environment variables inside. Work on them one by one.
// position of first "$" sign:
NSRange r1 = [nameString rangeOfString:@"$"];
// position of first "/" after this $ sign:
NSRange r2 = [nameString rangeOfString:@"/" options:NULL range:NSMakeRange(r1.location + r1.length, [nameString length] - r1.location - r1.length)];
if (r2.location == NSNotFound) r2.location = [nameString length];
NSRange rSub = NSMakeRange(r1.location + r1.length, r2.location - r1.location - r1.length);
NSString *variable_string = [nameString substringWithRange:rSub];
const char* variable = ios_getenv([variable_string UTF8String]);
if (variable) {
// Okay, so this one exists.
NSString* replacement_string = [NSString stringWithCString:variable encoding:NSUTF8StringEncoding];
variable_string = [[NSString stringWithCString:"$" encoding:NSUTF8StringEncoding] stringByAppendingString:variable_string];
nameString = [nameString stringByReplacingOccurrencesOfString:variable_string withString:replacement_string];
} else cannotExpand = true; // found a variable we can't expand. stop trying for this fileName
}
return [nameString UTF8String];
}
static void initializeCommandList(void)
{
// Loads command names and where to find them (digital library, function name) from plist dictionaries:
//
// Syntax for the dictionaris:
// key = command name, followed by an array of 4 components:
// 1st component: name of digital library (will be passed to dlopen(), can be SELF for RTLD_SELF or MAIN for RTLD_MAIN_ONLY)
// 2nd component: name of function to be called
// 3rd component: chain sent to getopt (for arguments in autocomplete)
// 4th component: takes a file/directory as argument
//
// Example:
// <key>rlogin</key>
// <array>
// <string>libnetwork_ios.dylib</string>
// <string>rlogin_main</string>
// <string>468EKLNS:X:acde:fFk:l:n:rs:uxy</string>
// <string>no</string>
// </array>
if (commandList != nil) return;
NSError *error;
NSString* applicationDirectory = [[NSBundle mainBundle] resourcePath];
NSString* commandDictionary = [applicationDirectory stringByAppendingPathComponent:@"commandDictionary.plist"];
NSURL *locationURL = [NSURL fileURLWithPath:commandDictionary isDirectory:NO];
if ([locationURL checkResourceIsReachableAndReturnError:&error] == NO) { NSLog(@"%@", [error localizedDescription]); return; }
NSData* loadedFromFile = [NSData dataWithContentsOfFile:commandDictionary options:0 error:&error];
if (!loadedFromFile) { NSLog(@"%@", [error localizedDescription]); return; }
commandList = [NSPropertyListSerialization propertyListWithData:loadedFromFile options:NSPropertyListImmutable format:NULL error:&error];
if (!commandList) { NSLog(@"%@", [error localizedDescription]); return; }
// replaces the following command, marked as deprecated in the doc:
// commandList = [NSDictionary dictionaryWithContentsOfFile:commandDictionary];
if (sideLoading) {
// more commands, for sideloaders (commands that won't pass AppStore rules, or with licensing issues):
NSString* extraCommandsDictionary = [applicationDirectory stringByAppendingPathComponent:@"extraCommandsDictionary.plist"];
locationURL = [NSURL fileURLWithPath:extraCommandsDictionary isDirectory:NO];
if ([locationURL checkResourceIsReachableAndReturnError:&error] == NO) { NSLog(@"%@", [error localizedDescription]); return; }
NSData* extraLoadedFromFile = [NSData dataWithContentsOfFile:extraCommandsDictionary options:0 error:&error];
if (!extraLoadedFromFile) { NSLog(@"%@", [error localizedDescription]); return; }
NSDictionary* extraCommandList = [NSPropertyListSerialization propertyListWithData:extraLoadedFromFile options:NSPropertyListImmutable format:NULL error:&error];
if (!extraCommandList) { NSLog(@"%@", [error localizedDescription]); return; }
// merge the two dictionaries:
NSMutableDictionary *mutableDict = [commandList mutableCopy];
[mutableDict addEntriesFromDictionary:extraCommandList];
commandList = [mutableDict copy];
}
}
int ios_setMiniRoot(NSString* mRoot) {
BOOL isDir;
NSFileManager *fileManager = [[NSFileManager alloc] init];
if (![fileManager fileExistsAtPath:mRoot isDirectory:&isDir]) {
return 0;
}
if (!isDir) {
return 0;
}
// fileManager has different ways of expressing the same directory.
// We need to actually change to the directory to get its "real name".
NSString* currentDir = [fileManager currentDirectoryPath];
if (![fileManager changeCurrentDirectoryPath:mRoot]) {
return 0;
}
// also don't set the miniRoot if we can't go in there
// get the real name for miniRoot:
miniRoot = [fileManager currentDirectoryPath];
// Back to where we we before:
[fileManager changeCurrentDirectoryPath:currentDir];
if (currentSession != nil) {
strcpy(currentSession->currentDir, [miniRoot UTF8String]);
strcpy(currentSession->previousDirectory, [miniRoot UTF8String]);
}
return 1; // mission accomplished
}