328 lines
7.4 KiB
C
328 lines
7.4 KiB
C
/* 서울기술교육센터 AIoT */
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/* author : KSH */
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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 <string.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <sys/time.h>
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#include <time.h>
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#include <errno.h>
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#define BUF_SIZE 512
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#define MAX_CLNT 32
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#define ID_SIZE 512
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#define ARR_CNT 5
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#define DEBUG
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typedef struct
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{
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int fd;
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char *from;
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char *to;
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char *msg;
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int len;
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} MSG_INFO;
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typedef struct
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{
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int index;
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int fd;
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char ip[20];
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char id[ID_SIZE];
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char pw[ID_SIZE];
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} CLIENT_INFO;
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void *clnt_connection(void *arg);
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void send_msg(MSG_INFO *msg_info, CLIENT_INFO *first_client_info);
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void error_handling(char *msg);
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void log_file(char *msgstr);
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void getlocaltime(char *buf);
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int clnt_cnt = 0;
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pthread_mutex_t mutx;
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int main(int argc, char *argv[])
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{
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int serv_sock, clnt_sock;
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struct sockaddr_in serv_adr, clnt_adr;
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int clnt_adr_sz;
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int sock_option = 1;
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pthread_t t_id[MAX_CLNT] = {0};
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int str_len = 0;
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int i = 0;
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char idpasswd[(ID_SIZE * 2) + 3];
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char *pToken;
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char *pArray[ARR_CNT] = {0};
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char msg[BUF_SIZE];
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FILE *idFd = fopen("idpasswd.txt", "r");
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if (idFd == NULL)
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{
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perror("fopen(\"idpasswd.txt\",\"r\") ");
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exit(1);
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}
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char id[ID_SIZE];
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char pw[ID_SIZE];
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CLIENT_INFO *client_info = (CLIENT_INFO *)calloc(sizeof(CLIENT_INFO), MAX_CLNT);
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if (client_info == NULL)
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{
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perror("calloc()");
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exit(1);
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}
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do
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{
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str_len = fscanf(idFd, "%s %s", id, pw);
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if (str_len <= 0)
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break;
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client_info[i].fd = -1;
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strcpy(client_info[i].id, id);
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strcpy(client_info[i].pw, pw);
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i++;
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if (i > MAX_CLNT)
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{
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printf("error client_info pull(Max:%d)\n", MAX_CLNT);
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break;
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}
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} while (1);
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fclose(idFd);
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if (argc != 2)
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{
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printf("Usage : %s <port>\n", argv[0]);
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exit(1);
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}
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fputs("IoT Server Start!!\n", stdout);
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if (pthread_mutex_init(&mutx, NULL))
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error_handling("mutex init error");
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serv_sock = socket(PF_INET, SOCK_STREAM, 0);
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memset(&serv_adr, 0, sizeof(serv_adr));
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serv_adr.sin_family = AF_INET;
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serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
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serv_adr.sin_port = htons(atoi(argv[1]));
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setsockopt(serv_sock, SOL_SOCKET, SO_REUSEADDR, (void *)&sock_option, sizeof(sock_option));
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if (bind(serv_sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
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error_handling("bind() error");
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if (listen(serv_sock, 5) == -1)
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error_handling("listen() error");
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while (1)
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{
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clnt_adr_sz = sizeof(clnt_adr);
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clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &clnt_adr_sz);
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if (clnt_cnt >= MAX_CLNT)
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{
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printf("socket full\n");
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shutdown(clnt_sock, SHUT_WR);
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continue;
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}
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else if (clnt_sock < 0)
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{
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perror("accept()");
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continue;
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}
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str_len = read(clnt_sock, idpasswd, sizeof(idpasswd));
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idpasswd[str_len] = '\0';
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if (str_len > 0)
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{
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i = 0;
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pToken = strtok(idpasswd, "[:]");
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while (pToken != NULL)
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{
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pArray[i] = pToken;
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if (i++ >= ARR_CNT)
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break;
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pToken = strtok(NULL, "[:]");
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}
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for (i = 0; i < MAX_CLNT; i++)
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{
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if (!strcmp(client_info[i].id, pArray[0]))
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{
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if (!strcmp(client_info[i].pw, pArray[1]))
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{
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// 같은 ID가 이미 연결 중이면, 이전 세션을 끊고 **지금 소켓으로 인수**
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if (client_info[i].fd != -1)
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{
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sprintf(msg, "[%s] takeover previous session (old fd:%d)\n",
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pArray[0], client_info[i].fd);
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log_file(msg);
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// 이전 연결 정리
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close(client_info[i].fd);
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pthread_mutex_lock(&mutx);
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clnt_cnt--; // 아래에서 새로 +1 할 거라서 미리 -1
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pthread_mutex_unlock(&mutx);
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}
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// 새 연결 등록
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strcpy(client_info[i].ip, inet_ntoa(clnt_adr.sin_addr));
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pthread_mutex_lock(&mutx);
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client_info[i].index = i;
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client_info[i].fd = clnt_sock;
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clnt_cnt++;
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pthread_mutex_unlock(&mutx);
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sprintf(msg,"[%s] New connected! (ip:%s,fd:%d,sockcnt:%d)\n",
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pArray[0], inet_ntoa(clnt_adr.sin_addr), clnt_sock, clnt_cnt);
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log_file(msg);
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write(clnt_sock, msg, strlen(msg));
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pthread_create(t_id + i, NULL, clnt_connection, (void *)(client_info + i));
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pthread_detach(t_id[i]);
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break;
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}
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}
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}
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if (i == MAX_CLNT)
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{
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sprintf(msg, "[%s] Authentication Error!\n", pArray[0]);
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write(clnt_sock, msg, strlen(msg));
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log_file(msg);
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shutdown(clnt_sock, SHUT_WR);
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}
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}
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else
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shutdown(clnt_sock, SHUT_WR);
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}
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return 0;
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}
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void *clnt_connection(void *arg)
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{
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CLIENT_INFO *client_info = (CLIENT_INFO *)arg;
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int str_len = 0;
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int index = client_info->index;
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char msg[BUF_SIZE];
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char to_msg[MAX_CLNT * ID_SIZE + 1];
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int i = 0;
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char *pToken;
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char *pArray[ARR_CNT] = {0};
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char strBuff[BUF_SIZE * 2] = {0};
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MSG_INFO msg_info;
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CLIENT_INFO *first_client_info;
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first_client_info = (CLIENT_INFO *)((void *)client_info - (void *)(sizeof(CLIENT_INFO) * index));
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while (1)
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{
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memset(msg, 0x0, sizeof(msg));
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str_len = read(client_info->fd, msg, sizeof(msg) - 1);
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if (str_len <= 0)
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break;
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msg[str_len] = '\0';
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pToken = strtok(msg, "[:]");
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i = 0;
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while (pToken != NULL)
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{
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pArray[i] = pToken;
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if (i++ >= ARR_CNT)
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break;
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pToken = strtok(NULL, "[:]");
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}
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msg_info.fd = client_info->fd;
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msg_info.from = client_info->id;
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msg_info.to = pArray[0];
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sprintf(to_msg, "[%s]%s", msg_info.from, pArray[1]);
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msg_info.msg = to_msg;
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msg_info.len = strlen(to_msg);
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sprintf(strBuff, "msg : [%s->%s] %s", msg_info.from, msg_info.to, pArray[1]);
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log_file(strBuff);
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send_msg(&msg_info, first_client_info);
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}
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close(client_info->fd);
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sprintf(strBuff, "Disconnect ID:%s (ip:%s,fd:%d,sockcnt:%d)\n", client_info->id, client_info->ip, client_info->fd, clnt_cnt - 1);
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log_file(strBuff);
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pthread_mutex_lock(&mutx);
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clnt_cnt--;
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client_info->fd = -1;
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pthread_mutex_unlock(&mutx);
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return 0;
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}
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void send_msg(MSG_INFO *msg_info, CLIENT_INFO *first_client_info)
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{
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int i = 0;
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if (!strcmp(msg_info->to, "ALLMSG"))
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{
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for (i = 0; i < MAX_CLNT; i++)
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if ((first_client_info + i)->fd != -1)
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write((first_client_info + i)->fd, msg_info->msg, msg_info->len);
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}
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else if (!strcmp(msg_info->to, "IDLIST"))
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{
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char *idlist = (char *)malloc(ID_SIZE * MAX_CLNT);
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msg_info->msg[strlen(msg_info->msg) - 1] = '\0';
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strcpy(idlist, msg_info->msg);
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for (i = 0; i < MAX_CLNT; i++)
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{
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if ((first_client_info + i)->fd != -1)
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{
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strcat(idlist, (first_client_info + i)->id);
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strcat(idlist, " ");
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}
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}
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strcat(idlist, "\n");
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write(msg_info->fd, idlist, strlen(idlist));
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free(idlist);
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}
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else if (!strcmp(msg_info->to, "GETTIME"))
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{
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sleep(1);
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getlocaltime(msg_info->msg);
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write(msg_info->fd, msg_info->msg, strlen(msg_info->msg));
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}
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else
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for (i = 0; i < MAX_CLNT; i++)
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if ((first_client_info + i)->fd != -1)
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if (!strcmp(msg_info->to, (first_client_info + i)->id))
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write((first_client_info + i)->fd, msg_info->msg, msg_info->len);
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}
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void error_handling(char *msg)
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{
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fputs(msg, stderr);
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fputc('\n', stderr);
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exit(1);
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}
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void log_file(char *msgstr)
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{
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fputs(msgstr, stdout);
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}
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void getlocaltime(char *buf)
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{
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struct tm *t;
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time_t tt;
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char wday[7][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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tt = time(NULL);
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if (errno == EFAULT)
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perror("time()");
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t = localtime(&tt);
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sprintf(buf, "[GETTIME]%02d.%02d.%02d %02d:%02d:%02d %s", t->tm_year + 1900 - 2000, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, wday[t->tm_wday]);
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return;
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}
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