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xrdp-proprietary/sesman/session.c

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/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2008
*/
/**
*
* @file session.c
* @brief Session management code
* @author Jay Sorg, Simone Fedele
*
*/
#include "sesman.h"
#include "libscp_types.h"
#include <errno.h>
//#include <time.h>
extern tbus g_sync_event;
extern unsigned char g_fixedkey[8];
extern struct config_sesman* g_cfg; /* config.h */
struct session_chain* g_sessions;
int g_session_count;
static int g_sync_width;
static int g_sync_height;
static int g_sync_bpp;
static char* g_sync_username;
static char* g_sync_password;
static char* g_sync_domain;
static char* g_sync_program;
static char* g_sync_directory;
static tbus g_sync_data;
static tui8 g_sync_type;
static int g_sync_result;
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bydata(char* name, int width, int height, int bpp, int type)
{
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp = g_sessions;
while (tmp != 0)
{
if (g_strncmp(name, tmp->item->name, 255) == 0 &&
tmp->item->width == width &&
tmp->item->height == height &&
tmp->item->bpp == bpp &&
tmp->item->type == type)
{
/*THREAD-FIX release chain lock */
lock_chain_release();
return tmp->item;
}
tmp = tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
/******************************************************************************/
/**
*
* @brief checks if there's a server running on a display
* @param display the display to check
* @return 0 if there isn't a display running, nonzero otherwise
*
*/
static int DEFAULT_CC
x_server_running_check_ports(int display)
{
char text[256];
int x_running;
int sck;
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
x_running = g_file_exist(text);
if (!x_running)
{
g_sprintf(text, "/tmp/.X%d-lock", display);
x_running = g_file_exist(text);
}
if (!x_running) /* check 59xx */
{
sck = g_tcp_socket();
g_sprintf(text, "59%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
if (!x_running) /* check 60xx */
{
sck = g_tcp_socket();
g_sprintf(text, "60%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
if (!x_running) /* check 62xx */
{
sck = g_tcp_socket();
g_sprintf(text, "62%2.2d", display);
x_running = g_tcp_bind(sck, text);
g_tcp_close(sck);
}
return x_running;
}
/******************************************************************************/
/**
*
* @brief checks if there's a server running on a display
* @param display the display to check
* @return 0 if there isn't a display running, nonzero otherwise
*
*/
static int DEFAULT_CC
x_server_running(int display)
{
char text[256];
int x_running;
int sck;
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
x_running = g_file_exist(text);
if (!x_running)
{
g_sprintf(text, "/tmp/.X%d-lock", display);
x_running = g_file_exist(text);
}
return x_running;
}
/******************************************************************************/
static void DEFAULT_CC
session_start_sessvc(int xpid, int wmpid, long data)
{
struct list* sessvc_params;
char wmpid_str[25];
char xpid_str[25];
char exe_path[262];
int i;
/* new style waiting for clients */
g_sprintf(wmpid_str, "%d", wmpid);
g_sprintf(xpid_str, "%d", xpid);
log_message(&(g_cfg->log), LOG_LEVEL_INFO,
"starting xrdp-sessvc - xpid=%s - wmpid=%s",
xpid_str, wmpid_str);
sessvc_params = list_create();
sessvc_params->auto_free = 1;
/* building parameters */
g_snprintf(exe_path, 261, "%s/xrdp-sessvc", XRDP_SBIN_PATH);
list_add_item(sessvc_params, (long)g_strdup(exe_path));
list_add_item(sessvc_params, (long)g_strdup(xpid_str));
list_add_item(sessvc_params, (long)g_strdup(wmpid_str));
list_add_item(sessvc_params, 0); /* mandatory */
/* executing sessvc */
g_execvp(exe_path, ((char**)sessvc_params->items));
/* should not get here */
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS,
"error starting xrdp-sessvc - pid %d - xpid=%s - wmpid=%s",
g_getpid(), xpid_str, wmpid_str);
/* logging parameters */
/* no problem calling strerror for thread safety: other threads
are blocked */
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "errno: %d, description: %s",
errno, g_get_strerror());
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "execve parameter list:");
for (i = 0; i < (sessvc_params->count); i++)
{
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[%d] = %s", i,
(char*)list_get_item(sessvc_params, i));
}
list_delete(sessvc_params);
/* keep the old waitpid if some error occurs during execlp */
g_waitpid(wmpid);
g_sigterm(xpid);
g_sigterm(wmpid);
g_sleep(1000);
auth_end(data);
g_exit(0);
}
/******************************************************************************/
/* called with the main thread
returns boolean */
static int APP_CC
session_is_display_in_chain(int display)
{
struct session_chain* chain;
struct session_item* item;
chain = g_sessions;
while (chain != 0)
{
item = chain->item;
if (item->display == display)
{
return 1;
}
chain = chain->next;
}
return 0;
}
/******************************************************************************/
/* called with the main thread */
static int APP_CC
session_get_aval_display_from_chain(void)
{
int display;
display = 10;
lock_chain_acquire();
while ((display - 10) <= g_cfg->sess.max_sessions)
{
if (!session_is_display_in_chain(display))
{
if (!x_server_running_check_ports(display))
{
lock_chain_release();
return display;
}
}
display++;
}
lock_chain_release();
return 0;
}
/******************************************************************************/
static int APP_CC
wait_for_xserver(int display)
{
int i;
/* give X a bit to start */
/* wait up to 10 secs for x server to start */
i = 0;
while (!x_server_running(display))
{
i++;
if (i > 40)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR,
"X server for display %d startup timeout",
display);
break;
}
g_sleep(250);
}
return 0;
}
/******************************************************************************/
/* called with the main thread */
static int APP_CC
session_start_fork(int width, int height, int bpp, char* username,
char* password, tbus data, tui8 type, char* domain,
char* program, char* directory)
{
int display;
int pid;
int wmpid;
int xpid;
int i;
char geometry[32];
char depth[32];
char screen[32];
char text[256];
char passwd_file[256];
char** pp1;
struct session_chain* temp;
struct list* xserver_params=0;
time_t ltime;
struct tm stime;
/* check to limit concurrent sessions */
if (g_session_count >= g_cfg->sess.max_sessions)
{
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "max concurrent session limit "
"exceeded. login for user %s denied", username);
return 0;
}
temp = (struct session_chain*)g_malloc(sizeof(struct session_chain), 0);
if (temp == 0)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "cannot create new chain "
"element - user %s", username);
return 0;
}
temp->item = (struct session_item*)g_malloc(sizeof(struct session_item), 0);
if (temp->item == 0)
{
g_free(temp);
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "cannot create new session "
"item - user %s", username);
return 0;
}
display = session_get_aval_display_from_chain();
if (display == 0)
{
g_free(temp->item);
g_free(temp);
return 0;
}
wmpid = 0;
pid = g_fork();
if (pid == -1)
{
}
else if (pid == 0) /* child sesman */
{
auth_start_session(data, display);
g_sprintf(geometry, "%dx%d", width, height);
g_sprintf(depth, "%d", bpp);
g_sprintf(screen, ":%d", display);
wmpid = g_fork();
if (wmpid == -1)
{
}
else if (wmpid == 0) /* child (child sesman) xserver */
{
wait_for_xserver(display);
env_set_user(username, 0, display);
if (x_server_running(display))
{
auth_set_env(data);
if (directory != 0)
{
if (directory[0] != 0)
{
g_set_current_dir(directory);
}
}
if (program != 0)
{
if (program[0] != 0)
{
g_execlp3(program, program, 0);
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS,
"error starting program %s for user %s - pid %d",
program, username, g_getpid());
}
}
/* try to execute user window manager if enabled */
if (g_cfg->enable_user_wm)
{
g_sprintf(text,"%s/%s", g_getenv("HOME"), g_cfg->user_wm);
if (g_file_exist(text))
{
g_execlp3(text, g_cfg->user_wm, 0);
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS,"error starting user "
"wm for user %s - pid %d", username, g_getpid());
/* logging parameters */
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "errno: %d, "
"description: %s", errno, g_get_strerror());
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG,"execlp3 parameter "
"list:");
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[0] = %s",
text);
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[1] = %s",
g_cfg->user_wm);
}
}
/* if we're here something happened to g_execlp3
so we try running the default window manager */
g_sprintf(text, "%s/%s", XRDP_CFG_PATH, g_cfg->default_wm);
g_execlp3(text, g_cfg->default_wm, 0);
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS,"error starting default "
"wm for user %s - pid %d", username, g_getpid());
/* logging parameters */
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "errno: %d, description: "
"%s", errno, g_get_strerror());
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG,"execlp3 parameter list:");
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[0] = %s",
text);
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[1] = %s",
g_cfg->default_wm);
/* still a problem starting window manager just start xterm */
g_execlp3("xterm", "xterm", 0);
/* should not get here */
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS,"error starting xterm "
"for user %s - pid %d", username, g_getpid());
/* logging parameters */
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "errno: %d, description: "
"%s", errno, g_get_strerror());
}
else
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "another Xserver is "
"already active on display %d", display);
}
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG,"aborting connection...");
g_exit(0);
}
else /* parent (child sesman) */
{
xpid = g_fork();
if (xpid == -1)
{
}
else if (xpid == 0) /* child */
{
env_set_user(username, passwd_file, display);
env_check_password_file(passwd_file, password);
if (type == SESMAN_SESSION_TYPE_XVNC)
{
xserver_params = list_create();
xserver_params->auto_free = 1;
/* these are the must have parameters */
list_add_item(xserver_params, (long)g_strdup("Xvnc"));
list_add_item(xserver_params, (long)g_strdup(screen));
list_add_item(xserver_params, (long)g_strdup("-geometry"));
list_add_item(xserver_params, (long)g_strdup(geometry));
list_add_item(xserver_params, (long)g_strdup("-depth"));
list_add_item(xserver_params, (long)g_strdup(depth));
list_add_item(xserver_params, (long)g_strdup("-rfbauth"));
list_add_item(xserver_params, (long)g_strdup(passwd_file));
/* additional parameters from sesman.ini file */
//config_read_xserver_params(SESMAN_SESSION_TYPE_XVNC,
// xserver_params);
list_append_list_strdup(g_cfg->vnc_params, xserver_params, 0);
/* make sure it ends with a zero */
list_add_item(xserver_params, 0);
pp1 = (char**)xserver_params->items;
g_execvp("Xvnc", pp1);
}
else if (type == SESMAN_SESSION_TYPE_XRDP)
{
xserver_params = list_create();
xserver_params->auto_free = 1;
/* these are the must have parameters */
list_add_item(xserver_params, (long)g_strdup("X11rdp"));
list_add_item(xserver_params, (long)g_strdup(screen));
list_add_item(xserver_params, (long)g_strdup("-geometry"));
list_add_item(xserver_params, (long)g_strdup(geometry));
list_add_item(xserver_params, (long)g_strdup("-depth"));
list_add_item(xserver_params, (long)g_strdup(depth));
/* additional parameters from sesman.ini file */
//config_read_xserver_params(SESMAN_SESSION_TYPE_XRDP,
// xserver_params);
list_append_list_strdup(g_cfg->rdp_params, xserver_params, 0);
/* make sure it ends with a zero */
list_add_item(xserver_params, 0);
pp1 = (char**)xserver_params->items;
g_execvp("X11rdp", pp1);
}
else
{
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS, "bad session type - "
"user %s - pid %d", username, g_getpid());
g_exit(1);
}
/* should not get here */
log_message(&(g_cfg->log), LOG_LEVEL_ALWAYS, "error starting X server "
"- user %s - pid %d", username, g_getpid());
/* logging parameters */
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "errno: %d, description: "
"%s", errno, g_get_strerror());
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, "execve parameter list: "
"%d", (xserver_params)->count);
for (i=0; i<(xserver_params->count); i++)
{
log_message(&(g_cfg->log), LOG_LEVEL_DEBUG, " argv[%d] = %s",
i, (char*)list_get_item(xserver_params, i));
}
list_delete(xserver_params);
g_exit(1);
}
else /* parent (child sesman)*/
{
wait_for_xserver(display);
g_snprintf(text, 255, "%d", display);
g_setenv("XRDP_SESSVC_DISPLAY", text, 1);
g_snprintf(text, 255, ":%d.0", display);
g_setenv("DISPLAY", text, 1);
/* new style waiting for clients */
session_start_sessvc(xpid, wmpid, data);
}
}
}
else /* parent sesman process */
{
temp->item->pid = pid;
temp->item->display = display;
temp->item->width = width;
temp->item->height = height;
temp->item->bpp = bpp;
temp->item->data = data;
g_strncpy(temp->item->name, username, 255);
ltime = g_time1();
localtime_r(&ltime, &stime);
temp->item->connect_time.year = (tui16)(stime.tm_year + 1900);
temp->item->connect_time.month = (tui8)stime.tm_mon;
temp->item->connect_time.day = (tui8)stime.tm_mday;
temp->item->connect_time.hour = (tui8)stime.tm_hour;
temp->item->connect_time.minute = (tui8)stime.tm_min;
zero_time(&(temp->item->disconnect_time));
zero_time(&(temp->item->idle_time));
temp->item->type=type;
temp->item->status=SESMAN_SESSION_STATUS_ACTIVE;
temp->next=g_sessions;
g_sessions=temp;
g_session_count++;
}
return display;
}
/******************************************************************************/
/* called by a worker thread, ask the main thread to call session_sync_start
and wait till done */
int DEFAULT_CC
session_start(int width, int height, int bpp, char* username, char* password,
long data, tui8 type, char* domain, char* program,
char* directory)
{
int display;
/* lock mutex */
lock_sync_acquire();
/* set shared vars */
g_sync_width = width;
g_sync_height = height;
g_sync_bpp = bpp;
g_sync_username = username;
g_sync_password = password;
g_sync_domain = domain;
g_sync_program = program;
g_sync_directory = directory;
g_sync_data = data;
g_sync_type = type;
/* set event for main thread to see */
g_set_wait_obj(g_sync_event);
/* wait for main thread to get done */
lock_sync_sem_acquire();
/* read result(display) from shared var */
display = g_sync_result;
/* unlock mutex */
lock_sync_release();
return display;
}
/******************************************************************************/
/* called with the main thread */
int APP_CC
session_sync_start(void)
{
g_sync_result = session_start_fork(g_sync_width, g_sync_height, g_sync_bpp,
g_sync_username, g_sync_password,
g_sync_data, g_sync_type, g_sync_domain,
g_sync_program, g_sync_directory);
lock_sync_sem_release();
return 0;
}
/******************************************************************************/
int DEFAULT_CC
session_kill(int pid)
{
struct session_chain* tmp;
struct session_chain* prev;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp=g_sessions;
prev=0;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "session descriptor for "
"pid %d is null!", pid);
if (prev == 0)
{
/* prev does no exist, so it's the first element - so we set
g_sessions */
g_sessions = tmp->next;
}
else
{
prev->next = tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_NULLITEM;
}
if (tmp->item->pid == pid)
{
/* deleting the session */
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "session %d - user %s - "
"terminated", tmp->item->pid, tmp->item->name);
g_free(tmp->item);
if (prev == 0)
{
/* prev does no exist, so it's the first element - so we set
g_sessions */
g_sessions = tmp->next;
}
else
{
prev->next = tmp->next;
}
g_free(tmp);
g_session_count--;
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_OK;
}
/* go on */
prev = tmp;
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return SESMAN_SESSION_KILL_NOTFOUND;
}
/******************************************************************************/
void DEFAULT_CC
session_sigkill_all()
{
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp=g_sessions;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "found null session "
"descriptor!");
}
else
{
g_sigterm(tmp->item->pid);
}
/* go on */
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
}
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bypid(int pid)
{
struct session_chain* tmp;
struct session_item* dummy;
dummy = g_malloc(sizeof(struct session_item), 1);
if (0 == dummy)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "internal error", pid);
return 0;
}
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp = g_sessions;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "session descriptor for "
"pid %d is null!", pid);
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
if (tmp->item->pid == pid)
{
/*THREAD-FIX release chain lock */
g_memcpy(dummy, tmp->item, sizeof(struct session_item));
lock_chain_release();
/*return tmp->item;*/
return dummy;
}
/* go on */
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
/******************************************************************************/
struct SCP_DISCONNECTED_SESSION*
session_get_byuser(char* user, int* cnt, unsigned char flags)
{
struct session_chain* tmp;
struct SCP_DISCONNECTED_SESSION* sess;
int count;
int index;
count=0;
/*THREAD-FIX require chain lock */
lock_chain_acquire();
tmp = g_sessions;
while (tmp != 0)
{
LOG_DBG(&(g_cfg->log), "user: %s", user);
if ((NULL == user) || (!g_strncasecmp(user, tmp->item->name, 256)))
{
LOG_DBG(&(g_cfg->log), "session_get_byuser: status=%d, flags=%d, "
"result=%d", (tmp->item->status), flags,
((tmp->item->status) & flags));
if ((tmp->item->status) & flags)
{
count++;
}
}
/* go on */
tmp=tmp->next;
}
if (count==0)
{
(*cnt)=0;
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
/* malloc() an array of disconnected sessions */
sess=g_malloc(count * sizeof(struct SCP_DISCONNECTED_SESSION),1);
if (sess==0)
{
(*cnt)=0;
/*THREAD-FIX release chain lock */
lock_chain_release();
return 0;
}
tmp = g_sessions;
index = 0;
while (tmp != 0)
{
#warning FIXME: we should get only disconnected sessions!
if ((NULL == user) || (!g_strncasecmp(user, tmp->item->name, 256)))
{
if ((tmp->item->status) & flags)
{
(sess[index]).SID=tmp->item->pid;
(sess[index]).type=tmp->item->type;
(sess[index]).height=tmp->item->height;
(sess[index]).width=tmp->item->width;
(sess[index]).bpp=tmp->item->bpp;
#warning FIXME: setting idle times and such
/*(sess[index]).connect_time.year = tmp->item->connect_time.year;
(sess[index]).connect_time.month = tmp->item->connect_time.month;
(sess[index]).connect_time.day = tmp->item->connect_time.day;
(sess[index]).connect_time.hour = tmp->item->connect_time.hour;
(sess[index]).connect_time.minute = tmp->item->connect_time.minute;
(sess[index]).disconnect_time.year = tmp->item->disconnect_time.year;
(sess[index]).disconnect_time.month = tmp->item->disconnect_time.month;
(sess[index]).disconnect_time.day = tmp->item->disconnect_time.day;
(sess[index]).disconnect_time.hour = tmp->item->disconnect_time.hour;
(sess[index]).disconnect_time.minute = tmp->item->disconnect_time.minute;
(sess[index]).idle_time.year = tmp->item->idle_time.year;
(sess[index]).idle_time.month = tmp->item->idle_time.month;
(sess[index]).idle_time.day = tmp->item->idle_time.day;
(sess[index]).idle_time.hour = tmp->item->idle_time.hour;
(sess[index]).idle_time.minute = tmp->item->idle_time.minute;*/
(sess[index]).conn_year = tmp->item->connect_time.year;
(sess[index]).conn_month = tmp->item->connect_time.month;
(sess[index]).conn_day = tmp->item->connect_time.day;
(sess[index]).conn_hour = tmp->item->connect_time.hour;
(sess[index]).conn_minute = tmp->item->connect_time.minute;
(sess[index]).idle_days = tmp->item->idle_time.day;
(sess[index]).idle_hours = tmp->item->idle_time.hour;
(sess[index]).idle_minutes = tmp->item->idle_time.minute;
index++;
}
}
/* go on */
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
lock_chain_release();
(*cnt)=count;
return sess;
}
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