updated client and server

src/client.c

@@ -12,7 +12,8 @@
 #include <termios.h>
 #include <unistd.h>
 
-#define PORT 7777
+#define DEFAULT_PORT 7777
+#define DEFAULT_IP "127.0.0.1"
 #define BUFFER_SIZE 4096
 #define USERNAME_MAX 50
 #define INPUT_HEIGHT 3
@@ -34,6 +35,10 @@ int scroll_offset = 0;
 
 unsigned char aes_key[AES_KEY_SIZE];
 
+// Параметры подключения
+char server_ip[256] = DEFAULT_IP;
+int server_port = DEFAULT_PORT;
+
 volatile int need_redraw = 0;
 volatile int running = 1;
 
@@ -299,7 +304,6 @@ void scroll_down() {
   }
 }
 
-// Формат пакета: [total_len:4][iv:12][tag:16][ciphertext:N]
 void send_encrypted_message(int socket, const char *plaintext) {
   unsigned char iv[AES_IV_SIZE];
   RAND_bytes(iv, AES_IV_SIZE);
@@ -324,7 +328,6 @@ void send_encrypted_message(int socket, const char *plaintext) {
   send(socket, ciphertext, ciphertext_len, 0);
 }
 
-// Получить и расшифровать сообщение
 int receive_encrypted_message(int socket, char *plaintext, int max_len) {
   int net_total_len;
   int valread = read(socket, &net_total_len, sizeof(int));
@@ -424,7 +427,14 @@ void handle_input() {
         return;
       }
 
-      // Форматируем и отправляем на сервер, НЕ добавляем локально!
+      // Проверяем длину чтобы избежать truncation
+      int max_msg_len = BUFFER_SIZE - strlen(username) - 5;
+      if (max_msg_len < 0) max_msg_len = 0;
+
+      if ((int) strlen(input_buffer) > max_msg_len) {
+        input_buffer[max_msg_len] = '\0';
+      }
+
       char full_msg[BUFFER_SIZE];
       int written = snprintf(full_msg, sizeof(full_msg), "[%s]: %s", username,
                              input_buffer);
@@ -435,7 +445,6 @@ void handle_input() {
       }
 
       send_encrypted_message(sock, full_msg);
-      // Сообщение появится когда придёт от сервера в receive_messages()
 
       pos = 0;
       input_buffer[0] = '\0';
@@ -481,7 +490,6 @@ void receive_messages() {
     char plaintext[BUFFER_SIZE];
     int len = receive_encrypted_message(sock, plaintext, BUFFER_SIZE);
     if (len > 0) {
-      // ВСЕ сообщения приходят через сервер — и свои, и чужие
       add_chat_message(plaintext);
     } else if (len < 0) {
       add_chat_message("*** Ошибка расшифровки сообщения ***");
@@ -498,18 +506,35 @@ void sigwinch_handler(int sig) {
 
 void parse_args(int argc, char *argv[]) {
   static struct option long_options[] = {
-      {"messagebuffer", required_argument, 0, 'm'}, {0, 0, 0, 0}};
+      {"messagebuffer", required_argument, 0, 'm'},
+      {"ip", required_argument, 0, 'i'},
+      {"port", required_argument, 0, 'p'},
+      {0, 0, 0, 0}};
 
   int opt;
-  while ((opt = getopt_long(argc, argv, "m:", long_options, NULL)) != -1) {
+  while ((opt = getopt_long(argc, argv, "m:i:p:", long_options, NULL)) != -1) {
     switch (opt) {
       case 'm':
         msg_buffer_size = atoi(optarg);
         if (msg_buffer_size < 10) msg_buffer_size = 10;
         if (msg_buffer_size > 10000) msg_buffer_size = 10000;
         break;
+      case 'i':
+        strncpy(server_ip, optarg, sizeof(server_ip) - 1);
+        server_ip[sizeof(server_ip) - 1] = '\0';
+        break;
+      case 'p':
+        server_port = atoi(optarg);
+        if (server_port < 1 || server_port > 65535) {
+          fprintf(stderr, "Invalid port: %s\n", optarg);
+          exit(1);
+        }
+        break;
       default:
-        fprintf(stderr, "Usage: %s [-m N|--messagebuffer=N]\n", argv[0]);
+        fprintf(stderr,
+                "Usage: %s [-m N|--messagebuffer=N] [-i IP|--ip=IP] [-p "
+                "PORT|--port=PORT]\n",
+                argv[0]);
         exit(1);
     }
   }
@@ -540,8 +565,13 @@ int main(int argc, char *argv[]) {
   }
 
   server_addr.sin_family = AF_INET;
-  server_addr.sin_port = htons(PORT);
+  server_addr.sin_port = htons(server_port);
-  inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr);
+  if (inet_pton(AF_INET, server_ip, &server_addr.sin_addr) <= 0) {
+    fprintf(stderr, "Invalid address: %s\n", server_ip);
+    return 1;
+  }
+
+  printf("[INFO] Connecting to %s:%d\n", server_ip, server_port);
 
   if (connect(sock, (struct sockaddr *) &server_addr, sizeof(server_addr)) <
       0) {

src/main.c

@@ -1,4 +1,5 @@
 #include <arpa/inet.h>
+#include <getopt.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -6,7 +7,8 @@
 #include <sys/socket.h>
 #include <unistd.h>
 
-#define PORT 7777
+#define DEFAULT_PORT 7777
+#define DEFAULT_IP "0.0.0.0"
 #define BUFFER_SIZE 8192
 #define MAX_CLIENTS 100
 #define HISTORY_SIZE 1000
@@ -32,6 +34,10 @@ int history_count = 0;
 int history_start = 0;
 pthread_mutex_t history_mutex = PTHREAD_MUTEX_INITIALIZER;
 
+// Параметры сервера
+char bind_ip[256] = DEFAULT_IP;
+int bind_port = DEFAULT_PORT;
+
 void add_to_history(const unsigned char *data, int len) {
   pthread_mutex_lock(&history_mutex);
   int idx = (history_start + history_count) % HISTORY_SIZE;
@@ -65,7 +71,6 @@ void send_history(int socket) {
   pthread_mutex_unlock(&history_mutex);
 }
 
-// Рассылка ВСЕМ клиентам включая отправителя (-1 = всем)
 void broadcast_to_all(const unsigned char *data, int len) {
   pthread_mutex_lock(&clients_mutex);
   for (int i = 0; i < MAX_CLIENTS; i++) {
@@ -86,7 +91,8 @@ void *handle_client(void *arg) {
   cli->username[valread] = '\0';
   cli->username[strcspn(cli->username, "\n")] = '\0';
 
-    printf("User '%s' connected\n", cli->username);
+  printf("User '%s' connected from %s\n", cli->username,
+         inet_ntoa(((struct sockaddr_in *) &cli)->sin_addr));
 
   send_history(cli->socket);
 
@@ -112,10 +118,7 @@ void *handle_client(void *arg) {
       total_read += valread;
     }
 
-        // Сохраняем
     add_to_history(data, total_len);
-
-        // Рассылаем ВСЕМ включая отправителя
     broadcast_to_all(data, total_len);
 
     free(data);
@@ -138,12 +141,41 @@ cleanup:
   pthread_exit(NULL);
 }
 
-int main() {
+void parse_args(int argc, char *argv[]) {
+  static struct option long_options[] = {{"ip", required_argument, 0, 'i'},
+                                         {"port", required_argument, 0, 'p'},
+                                         {0, 0, 0, 0}};
+
+  int opt;
+  while ((opt = getopt_long(argc, argv, "i:p:", long_options, NULL)) != -1) {
+    switch (opt) {
+      case 'i':
+        strncpy(bind_ip, optarg, sizeof(bind_ip) - 1);
+        bind_ip[sizeof(bind_ip) - 1] = '\0';
+        break;
+      case 'p':
+        bind_port = atoi(optarg);
+        if (bind_port < 1 || bind_port > 65535) {
+          fprintf(stderr, "Invalid port: %s\n", optarg);
+          exit(1);
+        }
+        break;
+      default:
+        fprintf(stderr, "Usage: %s [-i IP|--ip=IP] [-p PORT|--port=PORT]\n",
+                argv[0]);
+        exit(1);
+    }
+  }
+}
+
+int main(int argc, char *argv[]) {
   int server_fd, new_socket;
   struct sockaddr_in address;
   int opt = 1;
   int addrlen = sizeof(address);
 
+  parse_args(argc, argv);
+
   for (int i = 0; i < HISTORY_SIZE; i++) {
     message_history[i].data = NULL;
     message_history[i].data_len = 0;
@@ -160,8 +192,11 @@ int main() {
   }
 
   address.sin_family = AF_INET;
-    address.sin_addr.s_addr = INADDR_ANY;
+  address.sin_port = htons(bind_port);
-    address.sin_port = htons(PORT);
+  if (inet_pton(AF_INET, bind_ip, &address.sin_addr) <= 0) {
+    fprintf(stderr, "Invalid bind address: %s\n", bind_ip);
+    exit(EXIT_FAILURE);
+  }
 
   if (bind(server_fd, (struct sockaddr *) &address, sizeof(address)) < 0) {
     perror("bind failed");
@@ -173,10 +208,11 @@ int main() {
     exit(EXIT_FAILURE);
   }
 
-    printf("E2E Encrypted Server listening on port %d\n", PORT);
+  printf("E2E Encrypted Server listening on %s:%d\n", bind_ip, bind_port);
 
   while (1) {
-        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
+    if ((new_socket = accept(server_fd, (struct sockaddr *) &address,
+                             (socklen_t *) &addrlen)) < 0) {
       perror("accept");
       continue;
     }