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ios_system.m
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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 <Foundation/Foundation.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
// is executable, looking at "x" bit. Other methods fails on iOS:
#define S_ISXXX(m) ((m) & (S_IXUSR | S_IXGRP | S_IXOTH))
// Sideloading: when you compile yourself, as opposed to uploading on the app store
// If true, all functions are enabled + debug messages if dylib not found.
// If false, you get a smaller set, but more compliance with AppStore rules.
// *Must* be false in the main branch releases.
bool sideLoading = false;
// get getrlimit/setrlimit:
#include <sys/resource.h>
static struct rlimit limitFilesOpen;
extern __thread int __db_getopt_reset;
__thread FILE* thread_stdin;
__thread FILE* thread_stdout;
__thread FILE* thread_stderr;
__thread void* thread_context;
#import "sessionParameters.h"
static NSMutableDictionary* sessionList;
static NSMutableDictionary* pidThreadList;
static sessionParameters* currentSession;
// Python3 multiple interpreters:
// limit to 6 = 1 kernel, 4 notebooks, one extra.
// App Store limit is 200 MB
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;
// replace system-provided exit() by our own:
// Make sure we call pthread_cancel(currentSession.current_command_root_thread)
// as much as possible, because ios_exit can be called from a signal handler now.
void ios_exit(int n) {
if (currentSession != NULL) {
currentSession.global_errno = n;
pthread_cancel(currentSession.current_command_root_thread);
return;
}
pthread_exit(NULL);
}
int ios_getCommandStatus() {
if (currentSession != NULL) return currentSession.global_errno;
else return 0;
}
extern const char* ios_progname(void) {
if (currentSession != NULL) return [currentSession.commandName UTF8String];
else return getprogname();
}
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 isPipeOut;
bool isPipeErr;
} functionParameters;
static void cleanup_function(void* parameters) {
// This function is called when pthread_exit() or ios_kill() is called
functionParameters *p = (functionParameters *) parameters;
fflush(thread_stdin);
fflush(thread_stdout);
fflush(thread_stderr);
// release parameters:
char* commandName = p->argv_ref[0];
// NSLog(@"Terminating command: %s thread_id %x", commandName, pthread_self());
// Specific to run multiple python3 interpreters:
if ((strncmp(commandName, "python", 6) == 0) && (strlen(commandName) == strlen("python") + 1)) {
// It's one of the multiple python3 interpreters
char commandNumber = commandName[6];
if (commandNumber == '3') PythonIsRunning[0] = false;
else {
commandNumber -= 'A' - 1;
if ((commandNumber > 0) && (commandNumber < MaxPythonInterpreters))
PythonIsRunning[commandNumber] = false;
}
}
for (int i = 0; i < p->argc; i++) free(p->argv_ref[i]);
free(p->argv_ref);
free(p->argv);
if (p->isPipeOut) {
// Close stdout if it won't be closed by another thread
// (i.e. if it's different from the parent thread stdout)
fclose(thread_stdout);
thread_stdout = NULL;
}
if (p->isPipeErr) {
fclose(thread_stderr);
thread_stderr = NULL;
}
// Required for Jupyter. Must check for Blink/LibTerm/iVim:
if ((fileno(p->stderr) != fileno(currentSession.stderr))
&& (fileno(p->stderr) != fileno(stderr))
&& (fileno(p->stderr) != fileno(p->stdout)))
fclose(p->stderr);
if (fileno(p->stdout) != fileno(currentSession.stdout)
&& fileno(p->stdout) != fileno(stdout))
fclose(p->stdout);
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
ios_releaseThread(pthread_self());
}
void crash_handler(int sig) {
if (sig == SIGSEGV) {
fputs("segmentation fault\n", thread_stderr);
} else if (sig == SIGBUS) {
fputs("bus error\n", thread_stderr);
}
ios_exit(1);
}
static void* run_function(void* parameters) {
// fprintf(stderr, "Storing thread_id: %x\n", pthread_self());
functionParameters *p = (functionParameters *) parameters;
// 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;
signal(SIGSEGV, crash_handler);
signal(SIGBUS, 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 );
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;
// do recompute directoriesInPath only if $PATH has changed
static NSString* fullCommandPath = @"";
static NSArray *directoriesInPath;
void initializeEnvironment() {
// 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("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;
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_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);
// correspondence between thread_id and pid:
pidThreadList = [NSMutableDictionary new];
}
static char* parseArgument(char* argument, char* command) {
// expand all environment variables, convert "~" to $HOME (only if localFile)
// we also pass the shell command for some specific behaviour (don't do this for that command)
NSString* argumentString = [NSString stringWithCString:argument encoding:NSUTF8StringEncoding];
// 1) expand environment variables, + "~" (not wildcards ? and *)
bool cannotExpand = false;
while ([argumentString containsString:@"$"] && !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 = 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];
argumentString = [argumentString stringByReplacingOccurrencesOfString:variable_string withString:replacement_string];
} 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.
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)];
}
}
// Also convert ":~something" in PATH style variables
// We don't use these yet, but we could.
// We do this expansion only for setenv
if (strcmp(command, "setenv") == 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) {
if ([argumentString containsString:@":~/"]) {
NSString* test_string = @":~/";
NSString* replacement_string = [[NSString stringWithCString:":" encoding:NSUTF8StringEncoding] stringByAppendingString:homeDir];
replacement_string = [replacement_string stringByAppendingString:[NSString stringWithCString:"/" encoding:NSUTF8StringEncoding]];
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string];
} else if ([argumentString hasSuffix:@":~"]) {
NSString* test_string = @":~";
NSString* replacement_string = [[NSString stringWithCString:":" encoding:NSUTF8StringEncoding] stringByAppendingString:homeDir];
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange([argumentString length] - 2, 2)];
} else if ([argumentString hasSuffix:@":"]) {
NSString* test_string = @":";
NSString* replacement_string = [[NSString stringWithCString:":" encoding:NSUTF8StringEncoding] stringByAppendingString:homeDir];
argumentString = [argumentString stringByReplacingOccurrencesOfString:test_string withString:replacement_string options:NULL range:NSMakeRange([argumentString length] - 2, 2)];
}
}
}
}
const char* newArgument = [argumentString UTF8String];
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 void initializeCommandList()
{
// 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) {
currentSession.currentDir = miniRoot;
currentSession.previousDirectory = miniRoot;
}
return 1; // mission accomplished
}
// Called when
int ios_setMiniRootURL(NSURL* mRoot) {
NSFileManager *fileManager = [[NSFileManager alloc] init];
if (currentSession == NULL) {
currentSession = [[sessionParameters alloc] init];
}
currentSession.localMiniRoot = mRoot;
currentSession.previousDirectory = currentSession.currentDir;
currentSession.currentDir = [mRoot path];
[fileManager changeCurrentDirectoryPath:[mRoot path]];
return 1; // mission accomplished
}
int ios_setAllowedPaths(NSArray<NSString *> *paths) {
allowedPaths = paths;
return 1;
}
BOOL __allowed_cd_to_path(NSString *path) {
if (miniRoot == nil || [path hasPrefix:miniRoot]) {
return YES;
}
NSString *localMiniRootPath = currentSession.localMiniRoot.path;
if (localMiniRootPath && [path hasPrefix:localMiniRootPath]) {
return YES;
}
for (NSString *dir in allowedPaths) {
if ([path hasPrefix:dir]) {
return YES;
}
}
return NO;
}
void __cd_to_dir(NSString *newDir, NSFileManager *fileManager) {
BOOL isDir;
// Check for permission and existence:
if (![fileManager fileExistsAtPath:newDir isDirectory:&isDir]) {
fprintf(thread_stderr, "cd: %s: no such file or directory\n", [newDir UTF8String]);
return;
}
if (!isDir) {
fprintf(thread_stderr, "cd: %s: not a directory\n", [newDir UTF8String]);
return;
}
if (![fileManager isReadableFileAtPath:newDir] ||
![fileManager changeCurrentDirectoryPath:newDir]) {
fprintf(thread_stderr, "cd: %s: permission denied\n", [newDir UTF8String]);
return;
}
// We managed to change the directory.
// Was that allowed?
// Allowed "cd" = below miniRoot *or* below localMiniRoot
NSString* resultDir = [fileManager currentDirectoryPath];
if (__allowed_cd_to_path(resultDir)) {
currentSession.previousDirectory = currentSession.currentDir;
return;
}
fprintf(thread_stderr, "cd: %s: permission denied\n", [newDir UTF8String]);
// If the user tried to go above the miniRoot, set it to miniRoot
if ([miniRoot hasPrefix:resultDir]) {
[fileManager changeCurrentDirectoryPath:miniRoot];
currentSession.currentDir = miniRoot;
currentSession.previousDirectory = currentSession.currentDir;
} else {
// go back to where we were before:
[fileManager changeCurrentDirectoryPath:currentSession.currentDir];
}
}
int cd_main(int argc, char** argv) {
if (currentSession == NULL) {
return 1;
}
NSFileManager *fileManager = [[NSFileManager alloc] init];
if (argc > 1) {
NSString* newDir = @(argv[1]);
if (strcmp(argv[1], "-") == 0) {
// "cd -" option to pop back to previous directory
newDir = currentSession.previousDirectory;
}
__cd_to_dir(newDir, fileManager);
} else { // [cd] Help, I'm lost, bring me back home
currentSession.previousDirectory = [fileManager currentDirectoryPath];
if (miniRoot != nil) {
[fileManager changeCurrentDirectoryPath:miniRoot];
} else {
[fileManager changeCurrentDirectoryPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]];
}
}
currentSession.currentDir = [fileManager currentDirectoryPath];
return 0;
}
NSString* getoptString(NSString* commandName) {
if (commandList == nil) initializeCommandList();
NSArray* commandStructure = [commandList objectForKey: commandName];
if (commandStructure != nil) return commandStructure[2];
else return @"";
}
NSString* operatesOn(NSString* commandName) {
if (commandList == nil) initializeCommandList();
NSArray* commandStructure = [commandList objectForKey: commandName];
if (commandStructure != nil) return commandStructure[3];
else return @"";
}
int ios_executable(const char* inputCmd) {
// returns 1 if this is one of the commands we define in ios_system, 0 otherwise
if (commandList == nil) initializeCommandList();
NSArray* valuesFromDict = [commandList objectForKey: [NSString stringWithCString:inputCmd encoding:NSUTF8StringEncoding]];
// we could dlopen() here, but that would defeat the purpose
if (valuesFromDict == nil) return 0;
else return 1;
}
// Where to direct input/output of the next thread:
static __thread FILE* child_stdin = NULL;
static __thread FILE* child_stdout = NULL;
static __thread FILE* child_stderr = NULL;
FILE* ios_popen(const char* inputCmd, const char* type) {
// Save existing streams:
int fd[2] = {0};
const char* command = inputCmd;
// skip past all spaces
while ((command[0] == ' ') && strlen(command) > 0) command++;
// TODO: skip past "/bin/sh -c" and "sh -c"
if (pipe(fd) < 0) { return NULL; } // Nothing we can do if pipe fails
// NOTES: fd[0] is set up for reading, fd[1] is set up for writing
// fpout = fdopen(fd[1], "w");
// fpin = fdopen(fd[0], "r");
if (type[0] == 'w') {
// open pipe for reading
child_stdin = fdopen(fd[0], "r");
// launch command:
ios_system(command);
return fdopen(fd[1], "w");
} else if (type[0] == 'r') {
// open pipe for writing
// set up streams for thread
child_stdout = fdopen(fd[1], "w");
// launch command:
ios_system(command);
return fdopen(fd[0], "r");
}
return NULL;
}
// small function, behaves like strstr but skips quotes (Yury Korolev)
char *strstrquoted(char* str1, char* str2) {
if (str1 == NULL || str2 == NULL) {
return NULL;
}
size_t len1 = strlen(str1);
size_t len2 = strlen(str2);
if (len1 < len2) {
return NULL;
}
if (strcmp(str1, str2) == 0) {
return str1;
}
char quotechar = 0;
int esclen = 0;
int matchlen = 0;
for (int i = 0; i < len1; i++) {
char ch = str1[i];
if (quotechar) {
if (ch == '\\') {
esclen++;
continue;
}
if (ch == quotechar) {
if (esclen % 2 == 1) {
esclen = 0;
continue;
}
quotechar = 0;
esclen = 0;
continue;
}
esclen = 0;
continue;
}
if (ch == '"' || ch == '\'') {
if (esclen % 2 == 0) {
quotechar = ch;
}
matchlen = 0;
esclen = 0;
continue;
}
if (ch == '\\') {
esclen++;
}
if (str2[matchlen] == ch) {
matchlen++;
if (matchlen == len2) {
return str1 + i - matchlen + 1;
}
continue;
}
matchlen = 0;
}
return NULL;
}
static char* concatenateArgv(char* const argv[]) {
int argc = 0;
int cmdLength = 0;
// concatenate all arguments into a big command.
// We need this because some programs call execv() with a single string: "ssh [email protected] 'hg -R ... --stdio'"
// So we rely on ios_system to break them into chunks.
while(argv[argc] != NULL) { cmdLength += strlen(argv[argc]) + 1; argc++;}
if (argc == 0) return NULL; // safeguard check
char* cmd = malloc((cmdLength + 3 * argc) * sizeof(char)); // space for quotes
strcpy(cmd, argv[0]);
argc = 1;
while (argv[argc] != NULL) {
if (strstrquoted(argv[argc], " ")) {
// argument contains spaces. Enclose it into quotes:
if (strstrquoted(argv[argc], "\"") == NULL) {
// argument does not contain ". Enclose with "
strcat(cmd, " \"");
strcat(cmd, argv[argc]);
strcat(cmd, "\"");
argc++;
continue;
}
if (strstrquoted(argv[argc], "'") == NULL) {
// argument does not contain '. Enclose with '
strcat(cmd, " '");
strcat(cmd, argv[argc]);
strcat(cmd, "'");
argc++;
continue;
}
fprintf(thread_stderr, "Don't know what to do with this argument, sorry: %s\n", argv[argc]);
}
strcat(cmd, " ");
strcat(cmd, argv[argc]);
argc++;
}
return cmd;
}
int pbpaste(int argc, char** argv) {
// We can paste strings and URLs.
if ([UIPasteboard generalPasteboard].hasStrings) {
fprintf(thread_stdout, "%s", [[UIPasteboard generalPasteboard].string UTF8String]);
if (![[UIPasteboard generalPasteboard].string hasSuffix:@"\n"]) fprintf(thread_stdout, "\n");
return 0;
}
if ([UIPasteboard generalPasteboard].hasURLs) {
fprintf(thread_stdout, "%s\n", [[[UIPasteboard generalPasteboard].URL absoluteString] UTF8String]);
return 0;
}
return 1;
}
int pbcopy(int argc, char** argv) {
if (argc == 1) {
// no arguments, listen to stdin
const int bufsize = 1024;
char buffer[bufsize];
NSMutableData* data = [[NSMutableData alloc] init];
ssize_t count = 0;
while ((count = read(fileno(thread_stdin), buffer, bufsize-1))) {
[data appendBytes:buffer length:count];
}
NSString* result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (!result) {
return 1;
}
[UIPasteboard generalPasteboard].string = result;
} else {
// threre are arguments, concatenate and paste:
char* cmd = concatenateArgv(argv + 1);
[UIPasteboard generalPasteboard].string = @(cmd);
free(cmd);
}
return 0;
}
int ios_execv(const char *path, char* const argv[]) {
// path and argv[0] are the same (not in theory, but in practice, since Python wrote the command)
// start "child" with the child streams:
char* cmd = concatenateArgv(argv);
int returnValue = ios_system(cmd);
free(cmd);
return returnValue;
}
int ios_execve(const char *path, char* const argv[], char* envp[]) {
// TODO: save the environment (HOW?) and current dir
// TODO: replace environment with envp. envp looks a lot like current environment, though.
int returnValue = ios_execv(path, argv);
// TODO: restore the environment (HOW?)
return returnValue;
}
pthread_t ios_getLastThreadId() {
if (!currentSession) return nil;
return (currentSession.lastThreadId);
}
/*
* Public domain dup2() lookalike
* by Curtis Jackson @ AT&T Technologies, Burlington, NC
* electronic address: burl!rcj
* Edited for iOS by N. Holzschuch.
* The idea is that dup2(fd, [012]) is usually called between fork and exec.
*
* dup2 performs the following functions:
*
* Check to make sure that fd1 is a valid open file descriptor.
* Check to see if fd2 is already open; if so, close it.
* Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
* Return fd2 if all went well; return BADEXIT otherwise.
*/
int ios_dup2(int fd1, int fd2)
{
// iOS specifics: trying to access stdin/stdout/stderr?
if (fd1 < 3) {
// specific cases like dup2(STDOUT_FILENO, STDERR_FILENO)
FILE* stream1 = NULL;
switch (fd1) {
case 0: stream1 = child_stdin; break;
case 1: stream1 = child_stdout; break;
case 2: stream1 = child_stderr; break;
}
switch (fd2) {
case 0: child_stdin = stream1; return fd2;
case 1: child_stdout = stream1; return fd2;
case 2: child_stderr = stream1; return fd2;
}
}
if (fd2 == 0) { child_stdin = fdopen(fd1, "rb"); }
else if (fd2 == 1) { child_stdout = fdopen(fd1, "wb"); }
else if (fd2 == 2) {
if ((child_stdout != NULL) && (fileno(child_stdout) == fd1)) child_stderr = child_stdout;
else child_stderr = fdopen(fd1, "wb"); }
else if (fd1 != fd2) {
if (fcntl(fd1, F_GETFL) < 0)
return -1;
if (fcntl(fd2, F_GETFL) >= 0)
close(fd2);
if (fcntl(fd1, F_DUPFD, fd2) < 0)
return -1;
}
return fd2;
}
int ios_kill()
{
if (currentSession == NULL) return ESRCH;
if (currentSession.current_command_root_thread > 0) {
struct sigaction query_action;
if ((sigaction (SIGINT, NULL, &query_action) >= 0) &&
(query_action.sa_handler != SIG_DFL) &&
(query_action.sa_handler != SIG_IGN)) {
/* A programmer-defined signal handler is in effect. */
// This might be problematic with multiple commands running at the same time that all define SIGINT
// ...such as ls.
query_action.sa_handler(SIGINT);
// kill(getpid(), SIGINT); // infinite loop?
} else {
// Send pthread_cancel with the given signal to the current main thread, if there is one.
return pthread_cancel(currentSession.current_command_root_thread);
}
}
// No process running
return ESRCH;
}
int ios_killpid(pid_t pid, int sig) {
return pthread_cancel(ios_getThreadId(pid));
}
void ios_switchSession(const void* sessionId) {
NSFileManager *fileManager = [[NSFileManager alloc] init];
id sessionKey = @((NSUInteger)sessionId);
if (sessionList == nil) {
sessionList = [NSMutableDictionary new];
if (currentSession != NULL) [sessionList setObject: currentSession forKey: sessionKey];
}
currentSession = [sessionList objectForKey: sessionKey];
if (currentSession == NULL) {
currentSession = [[sessionParameters alloc] init];
[sessionList setObject: currentSession forKey: sessionKey];
} else {
if (![currentSession.currentDir isEqualToString:[fileManager currentDirectoryPath]]) {
[fileManager changeCurrentDirectoryPath:currentSession.currentDir];
}
currentSession.stdin = stdin;
currentSession.stdout = stdout;
currentSession.stderr = stderr;
}
}
void ios_setDirectoryURL(NSURL* workingDirectoryURL) {
NSFileManager *fileManager = [[NSFileManager alloc] init];
[fileManager changeCurrentDirectoryPath:[workingDirectoryURL path]];
if (currentSession != NULL) {
if ([currentSession.currentDir isEqualToString:[fileManager currentDirectoryPath]]) return;
currentSession.previousDirectory = currentSession.currentDir;
currentSession.currentDir = [workingDirectoryURL path];
}
}
void ios_closeSession(const void* sessionId) {
// delete information associated with current session:
if (sessionList == nil) return;
id sessionKey = @((NSUInteger)sessionId);
[sessionList removeObjectForKey: sessionKey];
currentSession = NULL;
}
int ios_isatty(int fd) {
if (currentSession == NULL) return 0;
// 2 possibilities: 0, 1, 2 (classical) or fileno(thread_stdout)
if (thread_stdin != NULL) {
if ((fd == STDIN_FILENO) || (fd == fileno(currentSession.stdin)) || (fd == fileno(thread_stdin)))
return (fileno(thread_stdin) == fileno(currentSession.stdin));
}
if (thread_stdout != NULL) {
if ((fd == STDOUT_FILENO) || (fd == fileno(currentSession.stdout)) || (fd == fileno(thread_stdout))) {
return (fileno(thread_stdout) == fileno(currentSession.stdout));
}
}
if (thread_stderr != NULL) {
if ((fd == STDERR_FILENO) || (fd == fileno(currentSession.stderr)) || (fd == fileno(thread_stderr)))
return (fileno(thread_stderr) == fileno(currentSession.stderr));
}
return 0;
}
void ios_setStreams(FILE* _stdin, FILE* _stdout, FILE* _stderr) {
if (currentSession == NULL) return;
currentSession.stdin = _stdin;
currentSession.stdout = _stdout;
currentSession.stderr = _stderr;
}
void ios_setContext(void *context) {
if (currentSession == NULL) return;
currentSession.context = context;
}
void* ios_getContext() {
if (currentSession == NULL) return NULL;
return currentSession.context;
}
// For customization:
// replaces a function (e.g. ls_main) with another one, provided by the user (ls_mine_main)
// if the function does not exist, add it to the list
// if "allOccurences" is true, search for all commands that share the same function, replace them too.
// ("compress" and "uncompress" both point to compress_main. You probably want to replace both, but maybe
// you just happen to have a very fast uncompress, different from compress).
// We work with function names, not function pointers.
void replaceCommand(NSString* commandName, NSString* functionName, bool allOccurences) {
// Does that function exist / is reachable? We've had problems with stripping.
int (*function)(int ac, char** av) = NULL;
function = dlsym(RTLD_MAIN_ONLY, functionName.UTF8String);
if (!function) {
NSLog(@"replaceCommand: %@ does not exist", functionName);
return; // if not, we don't replace.
}
if (commandList == nil) initializeCommandList();
NSArray* oldValues = [commandList objectForKey: commandName];
NSString* oldFunctionName = nil;
if (oldValues != nil) oldFunctionName = oldValues[1];
NSMutableDictionary *mutableDict = [commandList mutableCopy];
mutableDict[commandName] = [NSArray arrayWithObjects: @"MAIN", functionName, @"", @"file", nil];
if ((oldFunctionName != nil) && allOccurences) {
// scan through all dictionary entries
for (NSString* existingCommand in mutableDict.allKeys) {
NSArray* currentPosition = [mutableDict objectForKey: existingCommand];
if ([currentPosition[1] isEqualToString:oldFunctionName])
[mutableDict setValue: [NSArray arrayWithObjects: @"MAIN", functionName, @"", @"file", nil] forKey: existingCommand];
}
}
commandList = [mutableDict copy]; // back to non-mutable version
}
// For customization:
// Add an entire plist file defining multiple commands. Commands follow the same syntax as initializeCommandList:
//
// key = command name, followed by an array of 4 components:
// 1st component: name of digital library (can be "MAIN" if command is defined inside program)
// 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>
NSError* addCommandList(NSString* fileLocation) {
if (commandList == nil) initializeCommandList();
NSError* error;
NSURL *locationURL = [NSURL fileURLWithPath:fileLocation isDirectory:NO];
if ([locationURL checkResourceIsReachableAndReturnError:&error] == NO) {
fprintf(stderr, "Resource dictionary %s not found", fileLocation.UTF8String);
return error;
}
NSData* dataLoadedFromFile = [NSData dataWithContentsOfFile:fileLocation options:0 error:&error];
if (!dataLoadedFromFile) return error;
NSDictionary* newCommandList = [NSPropertyListSerialization propertyListWithData:dataLoadedFromFile options:NSPropertyListImmutable format:NULL error:&error];
if (!newCommandList) return error;
// merge the two dictionaries:
NSMutableDictionary *mutableDict = [commandList mutableCopy];
[mutableDict addEntriesFromDictionary:newCommandList];
commandList = [mutableDict copy];
return NULL;
}
NSString* commandsAsString() {
if (commandList == nil) initializeCommandList();
NSError * err;
NSData * jsonData = [NSJSONSerialization dataWithJSONObject:commandList.allKeys options:0 error:&err];
NSString * myString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
return myString;
}