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xrdp/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
session manager
linux only
*/
#include <stdlib.h>
#include "sesman.h"
extern unsigned char g_fixedkey[8];
extern struct config_sesman g_cfg; /* config.h */
#ifdef OLDSESSION
extern struct session_item g_session_items[100]; /* sesman.h */
#else
struct session_chain* g_sessions;
#endif
int g_session_count;
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bydata(char* name, int width, int height, int bpp)
{
#ifdef OLDSESSION
int i;
for (i = 0; i < 100; i++)
{
if (g_strncmp(name, g_session_items[i].name, 255) == 0 &&
g_session_items[i].width == width &&
g_session_items[i].height == height &&
g_session_items[i].bpp == bpp)
{
return g_session_items + i;
}
}
#else
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
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)
{
/*THREAD-FIX release chain lock */
return tmp->item;
}
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
#endif
return 0;
}
/******************************************************************************/
/* returns non zero if there is an xserver running on this display */
static int DEFAULT_CC
x_server_running(int display)
{
char text[256];
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
return g_file_exist(text);
}
/******************************************************************************/
/* returns 0 if error else the display number the session was started on */
int DEFAULT_CC
session_start(int width, int height, int bpp, char* username, char* password,
long data)
{
int display;
int pid;
int wmpid;
int xpid;
char geometry[32];
char depth[32];
char screen[32];
char cur_dir[256];
char text[256];
char passwd_file[256];
#ifndef OLDSESSION
struct session_chain* temp;
#endif
/*THREAD-FIX lock to control g_session_count*/
/* check to limit concurrent sessions */
if (g_session_count >= g_cfg.sess.max_sessions)
{
log_message(LOG_LEVEL_INFO, "max concurrent session limit exceeded. login for user %s denied", username);
return 0;
}
#ifndef OLDSESSION
temp=malloc(sizeof(struct session_chain));
if (temp == 0)
{
log_message(LOG_LEVEL_ERROR, "cannot create new chain element - user %s", username);
return 0;
}
temp->item = malloc(sizeof(struct session_item));
if (temp->item == 0)
{
free(temp);
log_message(LOG_LEVEL_ERROR, "cannot create new session item - user %s", username);
return 0;
}
#endif
g_get_current_dir(cur_dir, 255);
display = 10;
/*while (x_server_running(display) && display < 50)*/
/* we search for a free display up to max_sessions */
/* we should need no more displays than this */
while (x_server_running(display) && (display <= g_cfg.sess.max_sessions))
{
display++;
}
if (display >= 50)
{
return 0;
}
wmpid = 0;
pid = g_fork();
if (pid == -1)
{
}
else if (pid == 0) /* child */
{
g_unset_signals();
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 */
{
/* give X a bit to start */
g_sleep(1000);
env_set_user(username, 0, display);
if (x_server_running(display))
{
auth_set_env(data);
/* 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);
}
}
/* if we're here something happened to g_execlp3
so we try running the default window manager */
g_sprintf(text, "%s/%s", cur_dir, g_cfg.default_wm);
g_execlp3(text, g_cfg.default_wm, 0);
/* still a problem starting window manager just start xterm */
g_execlp3("xterm", "xterm", 0);
/* should not get here */
}
log_message(LOG_LEVEL_ALWAYS,"error starting window manager %s - pid %d", username, g_getpid());
g_exit(0);
}
else /* parent */
{
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);
g_execlp11("Xvnc", "Xvnc", screen, "-geometry", geometry,
"-depth", depth, "-bs", "-rfbauth", passwd_file, 0);
/* should not get here */
log_message(LOG_LEVEL_ALWAYS,"error doing execve for user %s - pid %d",username,g_getpid());
g_exit(0);
}
else /* parent */
{
g_waitpid(wmpid);
g_sigterm(xpid);
g_sigterm(wmpid);
g_sleep(1000);
auth_end(data);
g_exit(0);
}
}
}
else /* parent */
{
#ifdef OLDSESSION
g_session_items[display].pid = pid;
g_strcpy(g_session_items[display].name, username);
g_session_items[display].display = display;
g_session_items[display].width = width;
g_session_items[display].height = height;
g_session_items[display].bpp = bpp;
g_session_items[display].data = data;
g_session_items[display].connect_time=g_time1();
g_session_items[display].disconnect_time=(time_t) 0;
g_session_items[display].idle_time=(time_t) 0;
g_session_items[display].type=SESMAN_SESSION_TYPE_XVNC;
g_session_items[display].status=SESMAN_SESSION_STATUS_ACTIVE;
g_session_count++;
#else
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);
temp->item->connect_time=g_time1();
temp->item->disconnect_time=(time_t) 0;
temp->item->idle_time=(time_t) 0;
temp->item->type=SESMAN_SESSION_TYPE_XVNC;
temp->item->status=SESMAN_SESSION_STATUS_ACTIVE;
/*THREAD-FIX lock the chain*/
temp->next=g_sessions;
g_sessions=temp;
g_session_count++;
/*THERAD-FIX free the chain*/
#endif
g_sleep(5000);
}
return display;
}
/*
SESMAN_SESSION_TYPE_XRDP 1
SESMAN_SESSION_TYPE_XVNC 2
SESMAN_SESSION_STATUS_ACTIVE 1
SESMAN_SESSION_STATUS_IDLE 2
SESMAN_SESSION_STATUS_DISCONNECTED 3
struct session_item
{
char name[256];
int pid;
int display;
int width;
int height;
int bpp;
long data;
/ *
unsigned char status;
unsigned char type;
* /
/ *
time_t connect_time;
time_t disconnect_time;
time_t idle_time;
* /
};
struct session_chain
{
struct session_chain* next;
struct session_item* item;
};
*/
#ifndef OLDSESSION
/******************************************************************************/
int DEFAULT_CC
session_kill(int pid)
{
struct session_chain* tmp;
struct session_chain* prev;
/*THREAD-FIX require chain lock */
tmp=g_sessions;
prev=0;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(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 */
return SESMAN_SESSION_KILL_NULLITEM;
}
if (tmp->item->pid == pid)
{
/* deleting the session */
log_message(LOG_LEVEL_INFO, "session %d - user %s - terminated", tmp->item->pid, tmp->item->name);
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;
}
free(tmp);
g_session_count--;
/*THREAD-FIX release chain lock */
return SESMAN_SESSION_KILL_OK;
}
/* go on */
prev = tmp;
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
return SESMAN_SESSION_KILL_NOTFOUND;
}
/******************************************************************************/
struct session_item* DEFAULT_CC
session_get_bypid(int pid)
{
struct session_chain* tmp;
/*THREAD-FIX require chain lock */
tmp=g_sessions;
while (tmp != 0)
{
if (tmp->item == 0)
{
log_message(LOG_LEVEL_ERROR, "session descriptor for pid %d is null!", pid);
/*THREAD-FIX release chain lock */
return 0;
}
if (tmp->item->pid == pid)
{
/*THREAD-FIX release chain lock */
return tmp->item;
}
/* go on */
tmp=tmp->next;
}
/*THREAD-FIX release chain lock */
return 0;
}
#endif
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