Merge pull request 'Nextcloud's Groupfolder app support' (#3) from groupfolder-extension-support into main

Reviewed-on: #3

Makefile

@@ -1,2 +1,2 @@
 all:
-	g++ -lrt -std=c++17 src/main.cpp src/usermanager.cpp src/guarder.cpp -o ncsambawatcher
+	g++ -lrt -std=c++17 src/main.cpp src/usermanager.cpp -o ncsambawatcher

configs/ncsambawatcher.service

@@ -1,6 +1,7 @@
 [Unit]
 Description=A service which scan Nextcloud folders
-After=network.target
+After=network.target docker.service
+Requires=docker.service
 
 [Service]
 ExecStart=/usr/bin/ncsambawatcher

configs/smb.24.04.conf

@@ -0,0 +1,18 @@
+[global]
+
+   vfs objects = full_audit
+   full_audit:prefix = %u|%I|%m|%S
+   full_audit:success = mkdirat unlinkat renameat write
+   full_audit:failure = none
+   full_audit:facility = local5
+   full_audit:priority = NOTICE
+
+# Put this line only for the groupfolder's share
+[Some gorupfolder share]
+
+   full_audit:prefix = %u|%I|%m|__groupfolders/<group-folders-id>
+
+# To disable logs for a specific share
+[A share]
+
+    vfs objects = 

src/definitions.h

@@ -0,0 +1,11 @@
+#ifndef _LOCATIONS_H
+#define _LOCATIONS_H
+
+#define LOGFILE "journalctl -u smbd --since now -f"
+
+#define USER_LOG_LOCATION 3
+
+#define SCAN_CMD_USR "docker exec --user www-data nextcloud /var/www/html/occ files:scan --path="
+#define SCAN_CMD_GRP "docker exec --user www-data nextcloud /var/www/html/occ groupfolder:scan "
+
+#endif // _LOCATIONS_H

src/guarder.cpp

@@ -1 +0,0 @@
-#include "guarder.h"

src/guarder.h

@@ -1,50 +0,0 @@
-#ifndef _GUARDER_H
-#define _GUARDER_H
-
-#include <sys/types.h>
-#include <sys/shm.h>
-#include <sys/ipc.h>
-
-class guarder{
-private:
-    const int shmid;
-
-    void setFlag(bool value)
-    {
-        bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
-        *flag = value;
-        shmdt(flag);
-    }
-
-public:
-    guarder() : shmid(shmget(IPC_PRIVATE, sizeof(bool), 0666 | IPC_CREAT))
-    {
-        setFlagOff();
-    }
-
-    void setFlagOff()
-    {
-        setFlag(false);
-    }
-
-    void setFlagOn()
-    {
-        setFlag(true);
-    }
-
-    bool isFlagOn()
-    {
-        bool *flag = static_cast<bool *>(shmat(shmid, nullptr, 0));
-        bool ret = *flag;
-        shmdt(flag);
-        return ret;
-    }
-
-    ~guarder()
-    {
-        shmctl(shmid, IPC_RMID, nullptr);
-    }
-
-};
-
-#endif // _GUARDER_H

src/locations.h

@@ -1,8 +0,0 @@
-#ifndef _LOCATIONS_H
-#define _LOCATIONS_H
-
-#define LOGFILE "journalctl -u smbd --since now -f"
-
-#define USER_LOG_LOCATION 3
-
-#endif // _LOCATIONS_H

src/main.cpp

@@ -1,62 +1,23 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/wait.h>
 #include <iostream>
+#include <thread>
+#include <vector>
+#include <set>
 #include <array>
 #include <string>
-#include <vector>
-#include <unistd.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <fcntl.h>
-#include <signal.h>
-#include "locations.h"
+#include <mutex>
+#include <condition_variable>
+#include <cstdio>
 #include "usermanager.h"
-#include "guarder.h"
 
-#define MAXNAMESIZE 255
-#define SCAN_DONE_SIG SIGRTMIN
-#define SCAN_CMD_USR "docker exec --user www-data nextcloud /var/www/html/occ files:scan --path="
-
-int p1[2];
-guarder guard;
 userManager manager;
+std::condition_variable cv;
+std::mutex mtx;
 
-void flushManagerToPipe()
+void readingThreadFunc()
 {
-    if (!guard.isFlagOn())
-    {
-        std::vector<std::string> users = manager.getFlaggedUsers();
-
-        for (std::vector<std::string>::iterator it = users.begin(); it != users.end(); ++it)
-        {
-            int size = it->size();
-            write(p1[1], &size, sizeof(int));
-            write(p1[1], it->data(), size * sizeof(char));
-        }
-
-        manager.unflagAllUsers();
-    }
-}
-
-void handler(int sig) 
-{
-    if (sig == SCAN_DONE_SIG)
-    {
-        flushManagerToPipe();
-    }
-}
-
-int main()
-{
-    openlog("ncsambawatcher", LOG_PID | LOG_CONS, LOG_USER);
-    pipe(p1);
-
-    pid_t parent = getpid();
-    pid_t child = fork();
-
-    if (child > 0) // parent
-    {
-        signal(SCAN_DONE_SIG, handler);
-        close(p1[0]); // read
-
     FILE *logpipe = popen(LOGFILE, "r");
     std::array<char, 256> buffer;
 
@@ -67,53 +28,73 @@ int main()
         if (line.find('|') == std::string::npos)
             continue;
 
-            std::vector<std::string> x = splitLogFile(line, '|');
+        std::vector<std::string> x = splitString(line, '|');
         std::string user(x.at(USER_LOG_LOCATION));
+
+        {
+            std::lock_guard<std::mutex> lock(mtx);
             manager.addUser(user);
             manager.setUserFlagged(user);
+        }
+
+        cv.notify_one();
 
         std::cout << "User find: " << user << std::endl;
-
-            flushManagerToPipe();
     }
-
-        fclose(logpipe);
-        close(p1[1]); // write
-    }
-    else // child
-    {
-        close(p1[1]); // write
-
-        int size;
-        char *buffer = nullptr;
-
-        while (read(p1[0], &size, sizeof(int)))
-        {
-            if (buffer == nullptr)
-                buffer = new char[size];
-
-            read(p1[0], buffer, size * sizeof(char));
-            std::string name(buffer);
-
-            std::cout << "Scan received for: " << name << std::endl;
-
-            guard.setFlagOn();
-            system((std::string(SCAN_CMD_USR) + name).data());
-            guard.setFlagOff();
-
-            kill(parent, SCAN_DONE_SIG);
-
-            if (buffer != nullptr)
-            {
-                delete[] buffer;
-                buffer = nullptr;
-            }
-        }
-
-        close(p1[0]); // read
-    }
-
-    closelog();
-
-    return EXIT_SUCCESS;
+}
+
+void scannerThreadFunc()
+{
+    std::unique_lock<std::mutex> lock(mtx);
+    std::vector<pid_t> childrens;
+    while (true)
+    {
+        cv.wait(lock, []
+                { return manager.isAnybodyFlagged(); });
+
+        std::set<std::string> scanUsers = manager.getFlaggedUsers();
+        manager.unflagAllUsers();
+
+        lock.unlock();
+        childrens.clear();
+
+        for (const std::string& user : scanUsers)
+        {
+            pid_t child = fork();
+
+            if (child < 0)
+            {
+                std::cerr << "Fork failed for: " << user << std::endl;
+            }
+            else if (child == 0) // child
+            {
+                std::string cmd = userManager::getScanCommandFromUser(user);
+                execl("/bin/sh", "sh", "-c", cmd.c_str(), static_cast<char *>(nullptr));
+                std::cerr << "Scan failed" << std::endl;
+                _exit(EXIT_FAILURE);
+            }
+            else // parent
+            {
+                childrens.push_back(child);
+            }
+        }
+
+        for (const pid_t& pid : childrens)
+        {
+            waitpid(pid, nullptr, 0);
+        }
+
+        lock.lock();
+    }
+}
+
+int main()
+{
+    std::thread readingThread(readingThreadFunc);
+    std::thread scannerThread(scannerThreadFunc);
+
+    readingThread.join();
+    scannerThread.join();
+
+    return 0;
 }

src/usermanager.cpp

@@ -1,9 +1,9 @@
 #include "usermanager.h"
 
-std::vector<std::string> splitLogFile(const std::string& input, char delimiter = '|')
+std::vector<std::string> splitString(const std::string& str, char delimiter = '|')
 {
     std::vector<std::string> ret;
-    std::stringstream ss(input);
+    std::stringstream ss(str);
     std::string token;
 
     while (std::getline(ss, token, delimiter)) {
@@ -12,3 +12,13 @@ std::vector<std::string> splitLogFile(const std::string& input, char delimiter =
 
     return ret;
 }
+
+std::string userManager::getScanCommandFromUser(const std::string &user)
+{
+    if (user.find("__groupfolder") != std::string::npos)
+    {
+        return std::string(SCAN_CMD_GRP) + splitString(user, '/').back();
+    }
+
+    return std::string(SCAN_CMD_USR) + user;
+}

src/usermanager.h

@@ -4,25 +4,31 @@
 #include <string>
 #include <map>
 #include <vector>
+#include <set>
 #include <sstream>
-#include "locations.h"
+#include <mutex>
+#include "definitions.h"
 
-std::vector<std::string> splitLogFile(const std::string& input, char delimiter);
+std::vector<std::string> splitString(const std::string& input, char delimiter);
 
 class userManager
 {
 private:
     std::map<std::string, bool> users;
+    std::mutex mtx;
 
 public:
     
+    static std::string getScanCommandFromUser(const std::string&);
+
     void addUserFromLogLine(std::string &line)
     {
-        addUser(splitLogFile(line, '|').at(USER_LOG_LOCATION));
+        addUser(splitString(line, '|').at(USER_LOG_LOCATION));
     }
 
     void addUser(std::string &user)
     {
+        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 0)
         {
             users[user] = false;
@@ -31,16 +37,19 @@ public:
 
     void removeUser(std::string &user)
     {
+        std::lock_guard<std::mutex> lock(mtx);
         users.erase(user);
     }
 
     bool isContains(std::string &user)
     {
+        std::lock_guard<std::mutex> lock(mtx);
         return users.count(user) == 1;
     }
 
     void setUserFlagged(std::string &user)
     {
+        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 1)
         {
             users[user] = true;
@@ -49,6 +58,7 @@ public:
 
     void setUserUnflagged(std::string &user)
     {
+        std::lock_guard<std::mutex> lock(mtx);
         if (users.count(user) == 1)
         {
             users[user] = false;
@@ -57,38 +67,56 @@ public:
 
     void unflagAllUsers()
     {
+        std::lock_guard<std::mutex> lock(mtx);
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
             it->second = false;
         }
     }
 
-    std::vector<std::string> getUsers()
+    std::set<std::string> getUsers()
     {
-        std::vector<std::string> ret;
+        std::set<std::string> ret;
+
+        std::lock_guard<std::mutex> lock(mtx);
 
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
-            ret.push_back(it->first);
+            ret.insert(it->first);
         }
 
         return ret;
     }
 
-    std::vector<std::string> getFlaggedUsers()
+    std::set<std::string> getFlaggedUsers()
     {
-        std::vector<std::string> ret;
+        std::set<std::string> ret;
+
+        std::lock_guard<std::mutex> lock(mtx);
 
         for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
         {
             if (it->second)
             {
-                ret.push_back(it->first);
+                ret.insert(it->first);
             }
         }
 
         return ret;
     }
+
+    bool isAnybodyFlagged()
+    {
+        std::lock_guard<std::mutex> lock(mtx);
+    
+        for (std::map<std::string, bool>::iterator it = users.begin(); it != users.end(); ++it)
+        {
+            if (it->second)
+                return true;
+        }
+
+        return false;
+    }
 };
 
 #endif // _USERMAN_H