/** * xrdp: A Remote Desktop Protocol server. * * Copyright (C) Jay Sorg 2004-2012 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * listen for incoming connection */ #include "xrdp.h" #include "log.h" /* 'g_process' is protected by the semaphore 'g_process_sem'. One thread sets g_process and waits for the other to process it */ static tbus g_process_sem = 0; static struct xrdp_process *g_process = 0; /*****************************************************************************/ static int xrdp_listen_create_pro_done(struct xrdp_listen *self) { int pid; char text[256]; pid = g_getpid(); g_snprintf(text, 255, "xrdp_%8.8x_listen_pro_done_event", pid); self->pro_done_event = g_create_wait_obj(text); if (self->pro_done_event == 0) { log_message(LOG_LEVEL_ERROR,"Failure creating pro_done_event"); } return 0; } /*****************************************************************************/ struct xrdp_listen *APP_CC xrdp_listen_create(void) { struct xrdp_listen *self; self = (struct xrdp_listen *)g_malloc(sizeof(struct xrdp_listen), 1); xrdp_listen_create_pro_done(self); self->process_list = list_create(); if (g_process_sem == 0) { g_process_sem = tc_sem_create(0); } self->listen_trans = trans_create(TRANS_MODE_TCP, 16, 16); if (self->listen_trans == 0) { log_message(LOG_LEVEL_ERROR,"xrdp_listen_create: trans_create failed"); } return self; } /*****************************************************************************/ void APP_CC xrdp_listen_delete(struct xrdp_listen *self) { if (self->listen_trans != 0) { trans_delete(self->listen_trans); } if (g_process_sem != 0) { tc_sem_delete(g_process_sem); g_process_sem = 0; } g_delete_wait_obj(self->pro_done_event); list_delete(self->process_list); g_free(self); } /*****************************************************************************/ /* returns error */ static int APP_CC xrdp_listen_add_pro(struct xrdp_listen *self, struct xrdp_process *process) { list_add_item(self->process_list, (tbus)process); return 0; } /*****************************************************************************/ static int APP_CC xrdp_listen_delete_done_pro(struct xrdp_listen *self) { int i; struct xrdp_process *pro; for (i = self->process_list->count - 1; i >= 0; i--) { pro = (struct xrdp_process *)list_get_item(self->process_list, i); if (pro != 0) { if (pro->status < 0) { xrdp_process_delete(pro); list_remove_item(self->process_list, i); } } } return 0; } /*****************************************************************************/ /* i can't get stupid in_val to work, hum using global var for now */ THREAD_RV THREAD_CC xrdp_process_run(void *in_val) { struct xrdp_process *process; DEBUG(("process started")); process = g_process; g_process = 0; tc_sem_inc(g_process_sem); xrdp_process_main_loop(process); DEBUG(("process done")); return 0; } /*****************************************************************************/ static int xrdp_listen_get_port_address(char *port, int port_bytes, char *address, int address_bytes, int *tcp_nodelay, int *tcp_keepalive, struct xrdp_startup_params *startup_param) { int fd; int error; int index; char *val; struct list *names; struct list *values; char cfg_file[256]; /* default to port 3389 */ g_strncpy(port, "3389", port_bytes - 1); /* Default to all */ g_strncpy(address, "0.0.0.0", address_bytes - 1); /* see if port or address is in xrdp.ini file */ g_snprintf(cfg_file, 255, "%s/xrdp.ini", XRDP_CFG_PATH); fd = g_file_open(cfg_file); *tcp_nodelay = 0 ; *tcp_keepalive = 0 ; if (fd > 0) { names = list_create(); names->auto_free = 1; values = list_create(); values->auto_free = 1; if (file_read_section(fd, "globals", names, values) == 0) { for (index = 0; index < names->count; index++) { val = (char *)list_get_item(names, index); if (val != 0) { if (g_strcasecmp(val, "port") == 0) { val = (char *)list_get_item(values, index); error = g_atoi(val); if ((error > 0) && (error < 65000)) { g_strncpy(port, val, port_bytes - 1); } } if (g_strcasecmp(val, "address") == 0) { val = (char *)list_get_item(values, index); g_strncpy(address, val, address_bytes - 1); } if (g_strcasecmp(val, "fork") == 0) { val = (char *)list_get_item(values, index); startup_param->fork = text2bool(val); } if (g_strcasecmp(val, "tcp_nodelay") == 0) { val = (char *)list_get_item(values, index); *tcp_nodelay = text2bool(val); } if (g_strcasecmp(val, "tcp_keepalive") == 0) { val = (char *)list_get_item(values, index); *tcp_keepalive = text2bool(val); } } } } list_delete(names); list_delete(values); g_file_close(fd); } /* startup_param overrides */ if (startup_param->port[0] != 0) { g_strncpy(port, startup_param->port, port_bytes - 1); } return 0; } /*****************************************************************************/ static int APP_CC xrdp_listen_fork(struct xrdp_listen *self, struct trans *server_trans) { int pid; struct xrdp_process *process; pid = g_fork(); if (pid == 0) { /* child */ /* recreate some main globals */ xrdp_child_fork(); /* recreate the process done wait object, not used in fork mode */ /* close, don't delete this */ g_close_wait_obj(self->pro_done_event); xrdp_listen_create_pro_done(self); /* delete listener, child need not listen */ trans_delete(self->listen_trans); self->listen_trans = 0; /* new connect instance */ process = xrdp_process_create(self, 0); process->server_trans = server_trans; g_process = process; xrdp_process_run(0); xrdp_process_delete(process); /* mark this process to exit */ g_set_term(1); return 0; } /* parent */ trans_delete(server_trans); return 0; } /*****************************************************************************/ /* a new connection is coming in */ int DEFAULT_CC xrdp_listen_conn_in(struct trans *self, struct trans *new_self) { struct xrdp_process *process; struct xrdp_listen *lis; lis = (struct xrdp_listen *)(self->callback_data); if (lis->startup_params->fork) { return xrdp_listen_fork(lis, new_self); } process = xrdp_process_create(lis, lis->pro_done_event); if (xrdp_listen_add_pro(lis, process) == 0) { /* start thread */ process->server_trans = new_self; g_process = process; tc_thread_create(xrdp_process_run, 0); tc_sem_dec(g_process_sem); /* this will wait */ } else { xrdp_process_delete(process); } return 0; } /*****************************************************************************/ /* wait for incoming connections */ int APP_CC xrdp_listen_main_loop(struct xrdp_listen *self) { int error; int robjs_count; int cont; int timeout = 0; char port[128]; char address[256]; tbus robjs[8]; tbus term_obj; tbus sync_obj; tbus done_obj; int tcp_nodelay; int tcp_keepalive; self->status = 1; if (xrdp_listen_get_port_address(port, sizeof(port), address, sizeof(address), &tcp_nodelay, &tcp_keepalive, self->startup_params) != 0) { log_message(LOG_LEVEL_ERROR,"xrdp_listen_main_loop: xrdp_listen_get_port failed"); self->status = -1; return 1; } /*Create socket*/ error = trans_listen_address(self->listen_trans, port, address); if (error == 0) { if (tcp_nodelay) { if (g_tcp_set_no_delay(self->listen_trans->sck)) { log_message(LOG_LEVEL_ERROR,"Error setting tcp_nodelay"); } } if (tcp_keepalive) { if (g_tcp_set_keepalive(self->listen_trans->sck)) { log_message(LOG_LEVEL_ERROR,"Error setting tcp_keepalive"); } } self->listen_trans->trans_conn_in = xrdp_listen_conn_in; self->listen_trans->callback_data = self; term_obj = g_get_term_event(); /*Global termination event */ sync_obj = g_get_sync_event(); done_obj = self->pro_done_event; cont = 1; while (cont) { /* build the wait obj list */ robjs_count = 0; robjs[robjs_count++] = term_obj; robjs[robjs_count++] = sync_obj; robjs[robjs_count++] = done_obj; timeout = -1; if (self->listen_trans != 0) { if (trans_get_wait_objs(self->listen_trans, robjs, &robjs_count) != 0) { log_message(LOG_LEVEL_ERROR,"Listening socket is in wrong state we " "terminate listener"); break; } } /* wait - timeout -1 means wait indefinitely*/ if (g_obj_wait(robjs, robjs_count, 0, 0, timeout) != 0) { /* error, should not get here */ g_sleep(100); } if (g_is_wait_obj_set(term_obj)) /* termination called */ { break; } /* some function must be processed by this thread */ if (g_is_wait_obj_set(sync_obj)) { g_reset_wait_obj(sync_obj); g_process_waiting_function(); /* run the function */ } if (g_is_wait_obj_set(done_obj)) /* pro_done_event */ { g_reset_wait_obj(done_obj); /* a process has died remove it from lists*/ xrdp_listen_delete_done_pro(self); } /* Run the callback when accept() returns a new socket*/ if (trans_check_wait_objs(self->listen_trans) != 0) { break; } } /* stop listening */ trans_delete(self->listen_trans); self->listen_trans = 0; /* second loop to wait for all process threads to close */ cont = 1; while (cont) { if (self->process_list->count == 0) { break; } timeout = -1; /* build the wait obj list */ robjs_count = 0; robjs[robjs_count++] = sync_obj; robjs[robjs_count++] = done_obj; /* wait - timeout -1 means wait indefinitely*/ if (g_obj_wait(robjs, robjs_count, 0, 0, timeout) != 0) { /* error, should not get here */ g_sleep(100); } /* some function must be processed by this thread */ if (g_is_wait_obj_set(sync_obj)) { g_reset_wait_obj(sync_obj); g_process_waiting_function(); /* run the function that is waiting*/ } if (g_is_wait_obj_set(done_obj)) /* pro_done_event */ { g_reset_wait_obj(done_obj); xrdp_listen_delete_done_pro(self); } } } else { log_message(LOG_LEVEL_ERROR,"xrdp_listen_main_loop: listen error, possible port " "already in use"); } self->status = -1; return 0; }