Implemented GUI with zenity

Now the program is completely functional and is using zenity dialogues.
`sources` directory was renamed to `src`. UI related stuff was moved to
`src/gui/ui`.

Makefile

@@ -19,10 +19,10 @@ else
 	LDFLAGS +=
 endif
 
-SOURCES_DIR := ./sources
+SOURCES_DIR := ./src
 BUILD_DIR := ./build
 
-build: $(BUILD_DIR)/main.o $(BUILD_DIR)/sourcefs.o
+build: $(BUILD_DIR)/main.o $(BUILD_DIR)/sourcefs.o $(BUILD_DIR)/ui-socket.o
 	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $(BUILD_DIR)/icfs
 
 $(BUILD_DIR)/main.o: $(SOURCES_DIR)/main.c
@@ -31,5 +31,8 @@ $(BUILD_DIR)/main.o: $(SOURCES_DIR)/main.c
 $(BUILD_DIR)/sourcefs.o: $(SOURCES_DIR)/sourcefs.c $(SOURCES_DIR)/sourcefs.h
 	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
 
+$(BUILD_DIR)/ui-socket.o: $(SOURCES_DIR)/ui-socket.c $(SOURCES_DIR)/ui-socket.h
+	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
+
 clean:
 	rm $(BUILD_DIR)/*

src/gui/ui/icfs.cmb

@@ -0,0 +1,37 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<!DOCTYPE cambalache-project SYSTEM "cambalache-project.dtd">
+<cambalache-project version="0.94.0" target_tk="gtk-4.0">
+  <ui>
+	(1,None,"icfs.ui","start_window.ui",None,None,None,None,None,None,None),
+	(3,None,None,"open-dialog.ui",None,None,None,None,None,None,None)
+  </ui>
+  <object>
+	(1,1,"AdwApplicationWindow",None,None,None,None,None,0,None,None),
+	(1,2,"AdwToolbarView",None,1,None,None,None,0,None,None),
+	(1,3,"AdwHeaderBar",None,2,None,"top",None,0,None,None),
+	(1,4,"AdwPreferencesPage",None,2,None,None,None,1,None,None),
+	(1,5,"AdwPreferencesGroup",None,4,None,None,None,0,None,None),
+	(1,6,"AdwEntryRow",None,5,None,None,None,0,None,None),
+	(1,7,"GtkButton",None,6,None,None,None,0,None,None),
+	(1,8,"GtkButton",None,3,None,"start",None,0,None,None),
+	(3,1,"AdwMessageDialog",None,None,None,None,None,0,None,None)
+  </object>
+  <object_property>
+	(1,1,"AdwApplicationWindow","content","2",None,None,None,None,2,None,None,None,None),
+	(1,1,"GtkWindow","title","ICFS",None,None,None,None,None,None,None,None,None),
+	(1,2,"AdwToolbarView","content",None,None,None,None,None,4,None,None,None,None),
+	(1,6,"AdwEntryRow","input-hints","no-spellcheck",None,None,None,None,None,None,None,None,None),
+	(1,6,"AdwEntryRow","input-purpose","url",None,None,None,None,None,None,None,None,None),
+	(1,6,"AdwPreferencesRow","title","Mountpoint",None,None,None,None,None,None,None,None,None),
+	(1,7,"GtkButton","has-frame","False",None,None,None,None,None,None,None,None,None),
+	(1,7,"GtkButton","icon-name","folder-open-symbolic",None,None,None,None,None,None,None,None,None),
+	(1,8,"GtkButton","label","Start",None,None,None,None,None,None,None,None,None),
+	(3,1,"AdwMessageDialog","body","Allow this process to open the file?",None,None,None,None,None,None,None,None,None),
+	(3,1,"AdwMessageDialog","default-response","deny",None,None,None,None,None,None,None,None,None),
+	(3,1,"AdwMessageDialog","heading","Allow Access?",None,None,None,None,None,None,None,None,None)
+  </object_property>
+  <object_data>
+	(1,8,"GtkWidget",2,2,None,1,None,None,None,None),
+	(1,8,"GtkWidget",2,3,None,1,None,None,None,None)
+  </object_data>
+</cambalache-project>

src/gui/ui/start_window.ui

@@ -0,0 +1,44 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!-- Created with Cambalache 0.94.1 -->
+<interface>
+  <!-- interface-name icfs.ui -->
+  <requires lib="gtk" version="4.12"/>
+  <requires lib="libadwaita" version="1.6"/>
+  <object class="AdwApplicationWindow">
+    <property name="content">
+      <object class="AdwToolbarView">
+        <property name="content">
+          <object class="AdwPreferencesPage">
+            <child>
+              <object class="AdwPreferencesGroup">
+                <child>
+                  <object class="AdwEntryRow">
+                    <property name="input-hints">no-spellcheck</property>
+                    <property name="input-purpose">url</property>
+                    <property name="title">Mountpoint</property>
+                    <child>
+                      <object class="GtkButton">
+                        <property name="has-frame">False</property>
+                        <property name="icon-name">folder-open-symbolic</property>
+                      </object>
+                    </child>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+        </property>
+        <child type="top">
+          <object class="AdwHeaderBar">
+            <child type="start">
+              <object class="GtkButton">
+                <property name="label">Start</property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </property>
+    <property name="title">ICFS</property>
+  </object>
+</interface>

src/main.c

@@ -49,6 +49,7 @@
 #include <sys/file.h> /* flock(2) */
 
 #include "sourcefs.h"
+#include "ui-socket.h"
 
 const char *mountpoint = NULL;
 
@@ -356,10 +357,49 @@ static int xmp_utimens(const char *path, const struct timespec ts[2],
 }
 #endif
 
+// TODO: move this to other file
+const char *get_process_name_by_pid(const int pid) {
+  char *name = (char *)calloc(1024, sizeof(char));
+  if (name) {
+    sprintf(name, "/proc/%d/cmdline", pid);
+    FILE *f = fopen(name, "r");
+    if (f) {
+      size_t size;
+      size = fread(name, sizeof(char), 1024, f);
+      if (size > 0) {
+        if ('\n' == name[size - 1])
+          name[size - 1] = '\0';
+      }
+      fclose(f);
+    }
+  }
+  return name;
+}
+
+// TODO: move this somewhere else
+const char *real_filename(const char *filename) { return filename; }
+
 static int xmp_create(const char *path, mode_t mode,
                       struct fuse_file_info *fi) {
   int fd;
 
+  struct process_info pi;
+
+  struct fuse_context *fc = fuse_get_context();
+
+  pi.PID = fc->pid;
+  pi.UID = fc->uid;
+  pi.name = get_process_name_by_pid(pi.PID);
+
+  // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
+
+  if (ask_access(real_filename(path), pi)) {
+    free(pi.name);
+    return -EACCES;
+  }
+
+  free(pi.name);
+
   fd = source_create(path, fi->flags, mode);
   if (fd == -1)
     return -errno;
@@ -371,6 +411,22 @@ static int xmp_create(const char *path, mode_t mode,
 static int xmp_open(const char *path, struct fuse_file_info *fi) {
   int fd;
 
+  struct process_info pi;
+
+  struct fuse_context *fc = fuse_get_context();
+
+  pi.PID = fc->pid;
+  pi.UID = fc->uid;
+  pi.name = get_process_name_by_pid(pi.PID);
+
+  // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
+  if (ask_access(real_filename(path), pi)) {
+    free(pi.name);
+    return -EACCES;
+  }
+
+  free(pi.name);
+
   fd = source_open(path, fi->flags);
   if (fd == -1)
     return -errno;
@@ -663,9 +719,17 @@ int main(int argc, char *argv[]) {
 
   int ret = source_init(mountpoint);
   if (ret != 0) {
-    perror("Failed to initialize filesystem.");
+    perror("source_init");
     exit(EXIT_FAILURE);
   }
 
-  return fuse_main(argc, argv, &xmp_oper, NULL);
+  ret = init_ui_socket("/home/fedir/.icfs-sock");
+  if (ret != 0) {
+    perror("init_ui_socket");
+    exit(EXIT_FAILURE);
+  }
+
+  ret = fuse_main(argc, argv, &xmp_oper, NULL);
+  free(mountpoint);
+  return ret;
 }

src/sourcefs.c

@@ -13,7 +13,7 @@ static struct source_files_handle {
   int root_fd;
 } handle;
 
-const char *source_fname_translate(const char *filename) {
+const char *source_filename_translate(const char *filename) {
   if (strcmp("/", filename) == 0) {
     return ".";
   } else {
@@ -34,32 +34,32 @@ int source_init(const char *root_path) {
 }
 
 int source_mkdir(const char *filename, mode_t mode) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return mkdirat(handle.root_fd, relative_filename, mode);
 }
 
 int source_unlink(const char *filename) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return unlinkat(handle.root_fd, relative_filename, 0);
 }
 
 int source_stat(const char *restrict filename, struct stat *restrict statbuf) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return fstatat(handle.root_fd, relative_filename, statbuf, 0);
 }
 
 int source_rmdir(const char *filename) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return unlinkat(handle.root_fd, relative_filename, AT_REMOVEDIR);
 }
 
 int source_symlink(const char *target, const char *linkpath) {
-  const char *relative_linkpath = source_fname_translate(linkpath);
+  const char *relative_linkpath = source_filename_translate(linkpath);
   return symlinkat(target, handle.root_fd, relative_linkpath);
 }
 
 DIR *source_opendir(const char *filename) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   int fd = openat(handle.root_fd, relative_filename, NULL);
   if (fd < 0) {
     perror("Openat failed");
@@ -70,33 +70,33 @@ DIR *source_opendir(const char *filename) {
 }
 
 int source_rename(const char *oldpath, const char *newpath) {
-  const char *relative_oldpath = source_fname_translate(oldpath);
-  const char *relative_newpath = source_fname_translate(newpath);
+  const char *relative_oldpath = source_filename_translate(oldpath);
+  const char *relative_newpath = source_filename_translate(newpath);
   return renameat(handle.root_fd, relative_oldpath, handle.root_fd,
                   relative_newpath);
 }
 
 int source_link(const char *oldpath, const char *newpath) {
-  const char *relative_oldpath = source_fname_translate(oldpath);
-  const char *relative_newpath = source_fname_translate(newpath);
+  const char *relative_oldpath = source_filename_translate(oldpath);
+  const char *relative_newpath = source_filename_translate(newpath);
   return linkat(handle.root_fd, relative_oldpath, handle.root_fd,
                 relative_newpath, 0);
   // NOTE: perhaps the flags here need to be reevaluated.
 }
 
 int source_chmod(const char *filename, mode_t mode) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return fchmodat(handle.root_fd, relative_filename, mode, 0);
   // NOTE: perhaps the flags here need to be reevaluated.
 }
 
 int source_chown(const char *filename, uid_t owner, gid_t group) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return fchownat(handle.root_fd, filename, owner, group, AT_SYMLINK_NOFOLLOW);
 }
 
 int source_truncate(const char *filename, off_t length) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   int fd = openat(handle.root_fd, relative_filename, NULL);
   if (fd < 0) {
     perror("Openat failed");
@@ -106,11 +106,11 @@ int source_truncate(const char *filename, off_t length) {
 }
 
 int source_open(const char *filename, int flags) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return openat(handle.root_fd, relative_filename, flags);
 }
 
 int source_create(const char *filename, int flags, mode_t mode) {
-  const char *relative_filename = source_fname_translate(filename);
+  const char *relative_filename = source_filename_translate(filename);
   return openat(handle.root_fd, relative_filename, flags, mode);
 }

src/ui-socket.c

@@ -0,0 +1,56 @@
+#include <stddef.h>
+#include <sys/types.h>
+#define _GNU_SOURCE
+#include "ui-socket.h"
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+int init_ui_socket(const char *filename) {
+  char line[256];
+  FILE *fp;
+
+  // Test if Zenity is installed (get version)
+  fp = popen("zenity --version", "r");
+  if (fp == NULL) {
+    perror("Pipe returned a error");
+    return 1;
+  } else {
+    while (fgets(line, sizeof(line), fp))
+      printf("%s", line);
+    pclose(fp);
+    return 0;
+  }
+}
+
+/*
+ * This function is called from the FUSE operations functions. Those are called
+ * from separate threads. Therefore, there can be multiple threads that try to
+ * ask for access at the same time, but we have to
+ */
+
+int ask_access(const char *filename, struct process_info pi) {
+
+  FILE *fp;
+  size_t command_len =
+      139 + sizeof(pid_t) * 8 + strlen(pi.name) + strlen(filename);
+  char *command = (char *)malloc(command_len);
+  snprintf(command, command_len,
+           "zenity --question --title \"Allow Access?\" --text \"Allow process "
+           "<tt>%s</tt> with PID <tt>%d</tt> to access <tt>%s</tt>\"",
+           pi.name, pi.PID, filename);
+  // Zenity Question Message Popup
+  fp = popen(command, "r");
+  free(command);
+  if (fp == NULL) {
+    perror("Pipe returned a error");
+    return -1;
+  } else {
+    return WEXITSTATUS(pclose(fp));
+  }
+}

src/ui-socket.h

@@ -0,0 +1,22 @@
+
+/*
+ * Interface for controlling communication with the UI.
+ */
+
+#ifndef UI_SOCKET_H
+#define UI_SOCKET_H
+
+#include <sys/types.h>
+
+struct process_info {
+  pid_t PID;
+  const char *name;
+  uid_t UID;
+};
+
+// For default socket location, set socket_path = NULL.
+int init_ui_socket(const char *socket_path);
+
+int ask_access(const char *filename, struct process_info pi);
+
+#endif // !UI_SOCKET_H