More stuff done

README.md

@@ -21,7 +21,7 @@ A UNIX local messaging service
    - Once messages are retrieved, `djumbai-dequeue` sends them to the `djumbai-send` process. This process operates with root privileges.
 
 6. **Receiving and Delivery:**
-   - `djumbai-send` spawns a process named `djumbai-client-receive`, which operates under the context of the user intended to receive the message.
+   - `djumbai-send` spawns a process named `djumbai-client-receive`, which operates under the context of the user/group intended to receive the message.
    - `djumbai-client-receive` writes the received message to the recipient's message-box.
 
 7. **Message Retrieval by User:**
@@ -32,11 +32,11 @@ This structured breakdown elucidates the sequential steps involved in the Unix m
 
 ## Cenas concretas
 
-Mail queue - FIFO em /opt/djumbai/fifos/message_queue e so pode ser acedida por users do grupo djumbai-queue, que contem djumbai-enqueue e djumbai-dequeue
+Mail queue - FIFO em /opt/djumbai/fifos/message_queue e so pode ser acedida por users do grupo djumbai_queue, que contem djumbai_enqueue e djumbai_dequeue
 
-Send FIFO - FIFO em /opt/djumbai/fifos/send_fifo e so pode ser acedida por users do grupo djumbai-send, que contem djumbai-dequeue e djumbai-send
+Send FIFO - FIFO em /opt/djumbai/fifos/send_fifo e so pode ser acedida por users do grupo djumbai_send, que contem djumbai_dequeue e djumbai_send
 
-Mailbox pessoal - Diretoria em /opt/djumbai/user/$uid/mailbox, que so pode ser acedida pelo user com UID $uid
+Mailbox pessoal _ Diretoria em /opt/djumbai/user/$uid/mailbox, que so pode ser acedida pelo user com UID $uid
 
 SentBox pessoal - Diretoria em /opt/djumbai/user/$uid/sentbox, que so pode ser acedida pelo user com UID $uid
 

src/client/client.c

@@ -35,7 +35,7 @@ int send_message(unsigned int sender, unsigned int receiver) {
 		fgets(content, MAX_CONTENT_SIZE, stdin);
 
 		message msg;
-		if (new_message(&msg, sender, receiver, content) != 0) {
+		if (new_message(&msg, sender, 0, receiver, content) != 0) {
 			printf("Error when creating new message\n");
 		}
 

src/djumbai_client_receive/djumbai_client_receive.c

@@ -1,3 +1,62 @@
-int main(){
+#include "../../libs/communication/communication.h"
+#include "../../libs/protocol/protocol.h"
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
 
+int main() {
+
+	unsigned char buffer[MESSAGE_SIZE];
+	read(0, buffer, MESSAGE_SIZE);
+	message msg;
+	deserialize_message(buffer, MESSAGE_SIZE, &msg);
+
+	if (msg.header.isgroup) {
+		const char *directory_format = "/opt/djumbai/group/%d/";
+		char group_path[50];
+		sprintf(group_path, directory_format, msg.header.receiver);
+		char message_box_path[70];
+		sprintf(message_box_path, group_path, "message_box/");
+
+		struct stat st;
+		if (stat(group_path, &st) == -1) {
+			// Directory doesn't exist, so create it
+			if (mkdir(group_path, 0070) == -1) {
+				perror("mkdir");
+				return EXIT_FAILURE;
+			}
+		}
+		if (stat(message_box_path, &st) == -1) {
+			// Directory doesn't exist, so create it
+			if (mkdir(message_box_path, 0070) == -1) {
+				perror("mkdir");
+				return EXIT_FAILURE;
+			}
+		}
+        chroot(message_box_path);
+        //Do the rest
+	} else {
+        
+	//	struct stat st;
+	//	if (stat(user_path, &st) == -1) {
+	//		// Directory doesn't exist, so create it
+	//		if (mkdir(user_path, 0700) == -1) {
+	//			perror("mkdir");
+	//			return EXIT_FAILURE;
+	//		}
+	//	}
+	//	if (stat(message_box_path, &st) == -1) {
+	//		// Directory doesn't exist, so create it
+	//		if (mkdir(message_box_path, 0700) == -1) {
+	//			perror("mkdir");
+	//			return EXIT_FAILURE;
+	//		}
+	//	}
+    //    chroot(message_box_path);
+        //
+		// Message receiver is a user
+		// Write to the user's mailbox
+	}
 }

src/djumbai_send/djumbai_send.c

@@ -1,6 +1,8 @@
+#include "../../libs/communication/communication.h"
 #include "../../libs/protocol/protocol.h"
 #include <errno.h>
 #include <fcntl.h>
+#include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
@@ -38,16 +40,90 @@ int main() {
 		}
 	}
 
-	unsigned char buffer[MESSAGE_SIZE];
 	while (1) {
+		// Read message from the send_fifo
+		unsigned char buffer[MESSAGE_SIZE];
 		read(send_fifo_fd, buffer, MESSAGE_SIZE);
+		// Deserialize the message
+		message msg;
+		deserialize_message(buffer, MESSAGE_SIZE, &msg);
 
-		// SPAWN THE CHILD PROCESS TO PUT THE MESSAGE IN THE USER'S QUEUE
+		int pipe_to_child[2];
-		// CHECK IF THE MESSAGE IS DESTINED TO A GROUP
-        // IF IT IS DESTINED TO A GROUP, START THE CHILD PROCESS WITH THE UID OF THE SENDER AND GID OF THE GROUP
-        // THE SENDER MUST BE PART OF THE GROUP
 
-		memset(buffer, 0, MESSAGE_SIZE);
+		if (pipe(pipe_to_child) == -1) {
+			perror("pipe");
+			exit(EXIT_FAILURE);
+		}
+
+		pid_t pid = fork();
+		if (pid == -1) {
+			perror("fork");
+			exit(EXIT_FAILURE);
+		}
+
+		if (pid == 0) {				 // Child process
+			close(pipe_to_child[1]); // Close write end of pipe
+
+			if (msg.header.isgroup) {
+				// Message receiver is a group
+				// Get the UID of the nobody user.
+				const char *nobody_username = "nobody";
+
+				struct passwd *pw = getpwnam(nobody_username);
+				if (pw == NULL) {
+					fprintf(stderr, "User %s not found\n", nobody_username);
+					exit(EXIT_FAILURE);
+				}
+				// Set UID to nobody
+				if (setuid(pw->pw_uid) == -1) {
+					perror("setuid");
+					exit(EXIT_FAILURE);
+				}
+
+				// Set gid to receiver
+				if (setgid(msg.header.receiver) == -1) {
+					perror("setgid");
+					exit(EXIT_FAILURE);
+				}
+			} else {
+				// Message receiver is a user
+				// Change UID receiver
+				if (setuid(msg.header.receiver) == -1) {
+					perror("setuid");
+					exit(EXIT_FAILURE);
+				}
+
+				struct passwd *pw = getpwuid(msg.header.receiver);
+				if (pw == NULL) {
+					fprintf(stderr, "User with uid %d not found\n", msg.header.receiver);
+					exit(EXIT_FAILURE);
+				}
+
+				if (setgid(pw->pw_gid) == -1) {
+					perror("setgid");
+					exit(EXIT_FAILURE);
+				}
+			}
+
+			// Redirect stdin to read from pipe_to_child
+			dup2(pipe_to_child[0], STDIN_FILENO);
+
+			execlp("./bin/djumbai_client_receive", "djumbai_client_receive", NULL);
+
+			// If execlp fails
+			perror("execlp");
+			close(pipe_to_child[0]);
+			exit(EXIT_FAILURE);
+		} else {					 // Parent process
+			close(pipe_to_child[0]); // Close read end of pipe
+
+			write(pipe_to_child[1], buffer, sizeof(buffer));
+
+			// Close the write end of the pipe
+			close(pipe_to_child[1]);
+			// Wait for the child process to finish
+			wait(NULL);
+		}
 	}
 	close(send_fifo_fd);
 	unlink(send_fifo_path);