Done until djumbai-send

README.md

@@ -32,24 +32,12 @@ This structured breakdown elucidates the sequential steps involved in the Unix m
 
 ## Cenas concretas
 
-Mail queue - FIFO em /opt/djumbai/queue/mailqueue 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
 
-Mailbox pessoal - Diretoria em /opt/djumbai/mailbox/user/$uid, que so pode ser acedida pelo user com UID $uid
+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 grupo - Diretoria em /opt/djumbai/mailbox/group/$gid, que so pode ser acedida pelo grupo com GID $gid
-
-SentBox pessoal - Diretoria em /opt/djumbai/sentbox/user/$uid, que so pode ser acedida pelo user com UID $uid
-
-Repositorio de chaves publicas de utilizadores - Diretoria em /opt/djumbai/pub_keys/user/$uid que contem as chaves publicas de cada utilizador. Apenas o proprio user tem acesso de escrita no ficheiro da sua chave publica
-
-Repositorio de chaves publicas de grupos - Diretoria em /opt/djumbai/pub_keys/group/$gid que contem as chaves publicas de cada grupo. Apenas membros do proprio grupo tem acesso de escrita no ficheiro da sua chave publica
-
-Repositorio de chaves privadas de utilizadores - Diretoria em /opt/djumbai/priv_keys/user/$uid que contem as chaves privadas de cada utilizador. Apenas o proprio user tem acesso de leitura e escrita no ficheiro da sua chave publica
-
-Repositorio de chaves privadas de grupos - Diretoria em /opt/djumbai/priv_keys/group/$gid que contem as chaves privadas de cada grupo. Apenas membros do proprio grupo tem acesso de leitura e escrita no ficheiro da sua chave privada
-
-Envio de mensagem para utilizador - Mensagem assinada com chave privada do remetente e cifrada com a chave publica do destinatario.
-
-Envio de mensagem para grupo - Mensagem assinada com chave privada do remetente e cifrada com a chave publica do grupo.
+Mailbox pessoal - Diretoria em /opt/djumbai/user/$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
 
+Mailbox grupo - Diretoria em /opt/djumbai/group/$gid/mailbox, que so pode ser acedida pelo grupo com GID $gid

libs/protocol/protocol.c

@@ -1,11 +1,12 @@
 #include "protocol.h"
 
-int new_message(message *m, unsigned int sender, unsigned int receiver, char *content) {
+int new_message(message *m, unsigned int sender, unsigned int isgroup, unsigned int receiver, char *content) {
 	if (strlen(content) > MAX_CONTENT_SIZE) {
 		return 1;
 	}
 	m->header.version = VERSION;
 	m->header.sender = sender;
+    m->header.isgroup = isgroup;
 	m->header.receiver = receiver;
 	time(&m->header.timestamp);
 	strncpy(m->content, content, MAX_CONTENT_SIZE);

libs/protocol/protocol.h

@@ -8,13 +8,15 @@
 
 #define VERSION			 1
 #define MAX_CONTENT_SIZE (PIPE_BUF - sizeof(struct MessageHeader))
-#define MESSAGE_SIZE sizeof(struct Message)
+#define MESSAGE_SIZE (sizeof(struct Message))
 
 typedef struct MessageHeader {
 	// The protocol's version
 	unsigned int version;
 	// The sender is a user
 	unsigned int sender;
+    // Flag indicating if the receiver is a group
+    unsigned int isgroup;
 	// The receiver is either a user or a group
 	unsigned int receiver;
 	// The message was sent at this timestamp
@@ -29,6 +31,6 @@ typedef struct Message {
 } message;
 
 
-int new_message(message *m, unsigned int sender, unsigned int receiver, char *content);
+int new_message(message *m, unsigned int sender, unsigned int isgroup, unsigned int receiver, char *content);
 
 #endif // !PROTOCOL_H

src/client/client.c

@@ -21,18 +21,16 @@ int send_message(unsigned int sender, unsigned int receiver) {
 		// Redirect stdin to read from pipe_to_child
 		dup2(pipe_to_child[0], STDIN_FILENO);
 
-
-		// Execute a command, for example, a simple "cat" command
 		execlp("./bin/djumbai_client_send/djumbai_client_send", "djumbai_client_send", NULL);
+		close(pipe_to_child[0]);
 
 		// 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
 
-		printf("Please enter your message (Max of %ld bytes):\n", MAX_CONTENT_SIZE);
+		printf("Please enter your message (Max of %ld bytes):\n", MAX_CONTENT_SIZE - 1);
 		char content[MAX_CONTENT_SIZE];
 		fgets(content, MAX_CONTENT_SIZE, stdin);
 
@@ -42,13 +40,13 @@ int send_message(unsigned int sender, unsigned int receiver) {
 		}
 
 		// Serialize the message
-		unsigned char buffer[sizeof(struct Message)];
-		if (serialize_message(&msg, sizeof(struct Message), buffer) == -1) {
+		unsigned char buffer[MESSAGE_SIZE];
+		if (serialize_message(&msg, MESSAGE_SIZE, buffer) == -1) {
 			fprintf(stderr, "Error: Serialization failed\n");
 			return 1;
 		}
 
-		write(pipe_to_child[1], buffer, sizeof(buffer));
+		write(pipe_to_child[1], buffer, MESSAGE_SIZE);
 
 		// Close the write end of the pipe
 		close(pipe_to_child[1]);

src/djumbai_client_send/djumbai_client_send.c

@@ -33,8 +33,8 @@ int main() {
 	} else {					 // Parent process
 		close(pipe_to_child[0]); // Close read end of pipe
 
-		unsigned char buffer[sizeof(struct Message)];
-		read(0, buffer, sizeof(struct Message));
+		unsigned char buffer[MESSAGE_SIZE];
+		read(0, buffer, MESSAGE_SIZE);
 		write(pipe_to_child[1], buffer, sizeof(buffer));
 
 		// Close the write end of the pipe

src/djumbai_dequeue/djumbai_dequeue.c

@@ -1,8 +1,67 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
 #include <unistd.h>
+#include "../../libs/protocol/protocol.h"
 
-int main(){
-    //Make stdin the FIFO
-    //Read from FIFO
-    //Make stdout the output FIFO
-    //Write to another FIFO
+int main() {
+	// Change the root of the process so it doesn't have access to anything else.
+	chroot("/opt/djumbai/");
+	const char *message_queue_path = "fifos/message_queue";
+
+	if (access(message_queue_path, F_OK) != -1) {
+		// FIFO exists, delete it
+		if (unlink(message_queue_path) == -1) {
+			perror("unlink");
+			exit(EXIT_FAILURE);
+		}
+		printf("Existing FIFO deleted.\n");
+	}
+
+	// Open the FIFO for reading
+	if (mkfifo(message_queue_path, 0420) == -1) {
+		perror("mkfifo");
+		exit(EXIT_FAILURE);
+	}
+	int message_queue_fd;
+	message_queue_fd = open(message_queue_path, O_RDONLY);
+	if (message_queue_fd == -1) {
+		if (errno == ENOENT) {
+			// FIFO does not exist
+			printf("FIFO '%s' does not exist. Exiting...\n", message_queue_path);
+			return 1;
+		} else {
+			perror("open");
+			return 1;
+		}
+	}
+
+	// Open the FIFO for writing
+	const char *send_fifo_path = "fifos/send_fifo";
+	int send_fifo_fd;
+	send_fifo_fd = open(send_fifo_path, O_WRONLY);
+	if (send_fifo_fd == -1) {
+		if (errno == ENOENT) {
+			// FIFO does not exist
+			printf("FIFO '%s' does not exist. Exiting...\n", send_fifo_path);
+			return 1;
+		} else {
+			perror("open");
+			return 1;
+		}
+	}
+
+    unsigned char buffer[MESSAGE_SIZE];
+    while(1){
+        read(message_queue_fd,buffer,MESSAGE_SIZE);
+        write(send_fifo_fd,buffer,MESSAGE_SIZE);
+        memset(buffer, 0, MESSAGE_SIZE);
+    }
+    
+    close(message_queue_fd);
+    unlink(message_queue_path);
+    close(send_fifo_fd);
 }

src/djumbai_enqueue/djumbai_enqueue.c

@@ -4,7 +4,7 @@ int main() {
     //Change the root of the djumbai_enqueue process so it doesn't have access to anything else.
     chroot("/opt/djumbai/queue/");
 	const char *message_queue_path =
-		"mailqueue"; // Replace this with the path to your FIFO
+		"mailqueue";
 
 	// Open the FIFO for writing
 	int queue_fd;

src/djumbai_send/djumbai_send.c

@@ -1,3 +1,54 @@
-int main(){
+#include "../../libs/protocol/protocol.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
 
+int main() {
+
+	// Open the FIFO for writing
+	const char *send_fifo_path = "fifos/send_fifo";
+	if (access(send_fifo_path, F_OK) != -1) {
+		// FIFO exists, delete it
+		if (unlink(send_fifo_path) == -1) {
+			perror("unlink");
+			exit(EXIT_FAILURE);
+		}
+		printf("Existing FIFO deleted.\n");
+	}
+
+	// Open the FIFO for reading
+	if (mkfifo(send_fifo_path, 0420) == -1) {
+		perror("mkfifo");
+		exit(EXIT_FAILURE);
+	}
+
+	int send_fifo_fd;
+	send_fifo_fd = open(send_fifo_path, O_RDONLY);
+	if (send_fifo_fd == -1) {
+		if (errno == ENOENT) {
+			// FIFO does not exist
+			printf("FIFO '%s' does not exist. Exiting...\n", send_fifo_path);
+			return 1;
+		} else {
+			perror("open");
+			return 1;
+		}
+	}
+
+	unsigned char buffer[MESSAGE_SIZE];
+	while (1) {
+		read(send_fifo_fd, buffer, MESSAGE_SIZE);
+
+		// SPAWN THE CHILD PROCESS TO PUT THE MESSAGE IN THE USER'S QUEUE
+		// 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);
+	}
+	close(send_fifo_fd);
+	unlink(send_fifo_path);
 }