質問編集履歴
2
修正
test
CHANGED
File without changes
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test
CHANGED
@@ -18,6 +18,7 @@
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18
18
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{
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19
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int socket; // acceptで得たソケット
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pthread_t thread; // ユーザーのスレッド
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21
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+
int number; // Client *clientsの配列の添字
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char *name; // 登録した名前
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bool is_registered; // 登録したかどうか
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};
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@@ -29,6 +30,333 @@
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};
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〜省略
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+
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/// ソースコード全文
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <string.h>
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#define USEAGE "Usage: chat_server -p PORT\n"
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#define MAX_CONNECTIONS 100
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struct Client
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{
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int socket;
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pthread_t thread;
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int number;
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char *name;
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bool is_registered;
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};
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struct Clients
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{
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struct Client *clients[MAX_CONNECTIONS];
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int count;
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};
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static int listen_requests(int listen_port);
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static void *recv_message(void *void_client);
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static void analysis_message(char *message, struct Client *client);
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static bool has_name(char *name);
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static int push_client(struct Client *client);
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static void send_message(struct Client *client, char *message);
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static void broadcast_message(struct Client *client, char *message);
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static void *xmalloc(size_t size);
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static void free_client(struct Client *client);
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static void die(char *message);
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static struct Clients clients_info = {0};
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static pthread_mutex_t mutex;
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int main(int argc, char *argv[])
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{
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int port, c, socket_fd, c_socket_fd;
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if (argc < 3)
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{
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fprintf(stderr, USEAGE);
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exit(1);
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}
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while ((c = getopt(argc, argv, "p:")) != -1)
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{
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switch (c)
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{
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case 'p':
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port = atoi(optarg);
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if (port < 1024 || port > 65535)
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{
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fprintf(stderr, "ポート番号は、1024から65535の間で指定してください。\n");
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exit(1);
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}
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break;
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case '?':
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fprintf(stderr, USEAGE);
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exit(1);
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}
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}
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pthread_mutex_init(&mutex, NULL);
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socket_fd = listen_requests(port);
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while (1)
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{
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if ((c_socket_fd = accept(socket_fd, NULL, NULL)) == -1)
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die("accept(2)");
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struct Client *client = NULL;
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client = xmalloc(sizeof(struct Client));
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memset(client, 0, sizeof(struct Client));
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client->socket = c_socket_fd;
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client->name = NULL;
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client->is_registered = false;
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client->number = push_client(client);
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pthread_create(&client->thread, NULL, recv_message, client);
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pthread_detach(client->thread);
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}
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pthread_mutex_destroy(&mutex);
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return 0;
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}
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static void *recv_message(void *void_client)
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{
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struct Client *client = void_client;
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int recv_size;
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char recv_buf[1024];
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char *send_text;
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printf("%d\n", client->number);
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while (1)
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{
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recv_size = recv(client->socket, recv_buf, sizeof recv_buf, 0);
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if (recv_size == -1)
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die("recv");
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else if (recv_size == 0)
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{
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send_text = xmalloc(strlen(client->name) + 100);
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sprintf(send_text, "MESSAGE %sさんが、チャットから退出しました。\n", client->name);
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broadcast_message(client, send_text);
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free(send_text);
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free_client(client);
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return NULL;
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}
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else
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analysis_message(recv_buf, client);
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}
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return NULL;
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}
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static void analysis_message(char *message, struct Client *client)
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{
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char *method;
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char *send_text;
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char *m;
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char *tmp;
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tmp = xmalloc(strlen(message) + 1);
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strcpy(tmp, message);
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printf("%s\n", message);
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/*
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chat プロトコル
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ユーザー登録
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"CONNECT username",
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"CONNECT statuscode status_message"
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メッセージ送信・受信
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"MESSAGE (BODY)"
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*/
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m = strchr(message, ' ');
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*m++ = '\0';
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method = xmalloc(m - message);
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strcpy(method, message);
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// message = m;
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if (!strcmp("CONNECT", method) && !client->is_registered)
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{
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if (!has_name(m))
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{
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pthread_mutex_lock(&mutex);
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client->name = xmalloc(strlen(m) + 1);
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strcpy(client->name, m);
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pthread_mutex_unlock(&mutex);
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client->is_registered = true;
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send_text = xmalloc(strlen("CONNECT 200 OK") + 1);
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strcpy(send_text, "CONNECT 200 OK");
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send_message(client, send_text);
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send_text = realloc(send_text, strlen(client->name) + 100);
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if (send_text == NULL)
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die("realloc(3)");
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sprintf(send_text, "MESSAGE %sさんが、チャットに参加しました。\n", client->name);
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broadcast_message(client, send_text);
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free(send_text);
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}
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else
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{
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send_text = xmalloc(strlen("CONNECT 400 The name is exists") + 1);
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strcpy(send_text, "CONNECT 400 The name is exists");
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send_message(client, send_text);
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free(send_text);
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}
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}
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else if (!strcmp("MESSAGE", method) && client->is_registered)
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{
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send_text = xmalloc(strlen(m) + 1);
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strcpy(send_text, tmp);
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broadcast_message(client, send_text);
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free(send_text);
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}
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// else
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// {
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// }
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printf("%s\n", method);
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free(tmp);
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free(method);
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}
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+
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234
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static int listen_requests(int listen_port)
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{
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int socket_fd;
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struct sockaddr_in addr;
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+
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socket_fd = socket(AF_INET, SOCK_STREAM, 0);
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+
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if (socket_fd < 0)
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die("socket(2)");
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+
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addr.sin_family = AF_INET; // インターネットドメイン(IPv4)
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addr.sin_addr.s_addr = INADDR_ANY; // 全てのアドレスからの接続を受け入れる(=0.0.0.0)
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+
addr.sin_port = htons(listen_port);
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+
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if (bind(socket_fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) == -1)
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die("bind(2)");
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if (listen(socket_fd, MAX_CONNECTIONS) == -1)
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die("listen(2)");
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return socket_fd;
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}
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256
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+
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static int push_client(struct Client *client)
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{
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259
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int client_num, i;
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260
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+
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pthread_mutex_lock(&mutex);
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262
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+
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263
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for (i = 0; i < MAX_CONNECTIONS; i++)
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{
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265
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+
if (clients_info.clients[i] == NULL)
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266
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+
{
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267
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+
clients_info.clients[i] = client;
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client_num = i;
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269
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+
break;
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+
}
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}
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272
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+
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clients_info.count++;
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+
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pthread_mutex_unlock(&mutex);
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+
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277
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return client_num;
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278
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+
}
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279
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+
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280
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+
static bool has_name(char *name)
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281
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+
{
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282
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int i;
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283
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pthread_mutex_lock(&mutex);
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284
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+
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285
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+
for (i = 0; i < MAX_CONNECTIONS; i++)
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286
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+
{
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287
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+
if (clients_info.clients[i] != NULL && clients_info.clients[i]->name != NULL)
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288
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+
{
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289
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+
if (!strcmp(clients_info.clients[i]->name, name))
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+
return true;
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291
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+
}
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292
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+
}
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293
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+
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294
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+
pthread_mutex_unlock(&mutex);
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295
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+
|
296
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+
return false;
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297
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+
}
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298
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+
|
299
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+
static void send_message(struct Client *client, char *message)
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300
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+
{
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301
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+
ssize_t size;
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302
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+
|
303
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+
pthread_mutex_lock(&mutex);
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304
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+
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305
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+
size = send(client->socket, message, strlen(message) + 1, 0);
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306
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+
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307
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+
pthread_mutex_unlock(&mutex);
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308
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+
if (size < 0)
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309
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die("send(2)");
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310
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+
}
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311
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+
|
312
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+
static void broadcast_message(struct Client *client, char *message)
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313
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+
{
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314
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+
int i;
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315
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+
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316
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+
pthread_mutex_lock(&mutex);
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317
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+
|
318
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+
for (i = 0; i < MAX_CONNECTIONS; i++)
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319
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{
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320
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+
if (clients_info.clients[i] != NULL)
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321
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+
{
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322
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+
ssize_t size;
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323
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+
|
324
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+
size = send(clients_info.clients[i]->socket, message, strlen(message) + 1, 0);
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325
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+
if (size < 0)
|
326
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+
die("send(2)");
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327
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+
}
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328
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+
}
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329
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+
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330
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+
pthread_mutex_unlock(&mutex);
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331
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+
}
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332
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+
|
333
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+
static void free_client(struct Client *client)
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334
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+
{
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335
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+
pthread_mutex_lock(&mutex);
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336
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+
clients_info.clients[client->number] = NULL;
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337
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+
clients_info.count--;
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338
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+
free(client->name);
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339
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+
free(client);
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340
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+
pthread_mutex_unlock(&mutex);
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341
|
+
}
|
342
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+
|
343
|
+
static void *xmalloc(size_t size)
|
344
|
+
{
|
345
|
+
void *p;
|
346
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+
p = malloc(size);
|
347
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+
|
348
|
+
if (!p)
|
349
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+
die("malloc(3)");
|
350
|
+
|
351
|
+
return p;
|
352
|
+
}
|
353
|
+
|
354
|
+
static void die(char *message)
|
355
|
+
{
|
356
|
+
perror(message);
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357
|
+
exit(1);
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358
|
+
}
|
359
|
+
|
32
360
|
```
|
33
361
|
|
34
362
|
### 考えたこと
|
1
変更
test
CHANGED
File without changes
|
test
CHANGED
@@ -5,7 +5,7 @@
|
|
5
5
|
|
6
6
|
### 実現したいこと
|
7
7
|
クライアントが接続してきたら、配列にユーザー情報を格納、切断した場合ユーザー情報削除をしたいです。
|
8
|
-
どのような実装が最適でしょうか?
|
8
|
+
どのような実装が最適でしょうか?また、下記のような実装でも問題はないでしょうか?
|
9
9
|
|
10
10
|
### 該当のソースコード
|
11
11
|
|