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xenocara/app/xdm/session.c
matthieu 21c33a1b92 Update to xdm 1.1.9
2010-03-28 09:33:02 +00:00

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/*
Copyright 1988, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.
*/
/*
* xdm - display manager daemon
* Author: Keith Packard, MIT X Consortium
*
* session.c
*/
#include "dm.h"
#include "dm_auth.h"
#include "dm_error.h"
#include "greet.h"
#include <X11/Xlib.h>
#include <signal.h>
#include <X11/Xatom.h>
#include <X11/Xmu/Error.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <grp.h> /* for initgroups */
#ifdef AIXV3
# include <usersec.h>
#endif
#ifndef USE_PAM /* PAM modules should handle these */
# ifdef SECURE_RPC
# include <rpc/rpc.h>
# include <rpc/key_prot.h>
# if !HAVE_DECL_KEY_SETNET
extern int key_setnet(struct key_netstarg *arg);
# endif
# endif
# ifdef K5AUTH
# include <krb5/krb5.h>
# endif
#endif /* USE_PAM */
#ifdef __SCO__
# include <prot.h>
#endif
#ifndef GREET_USER_STATIC
# include <dlfcn.h>
# ifndef RTLD_NOW
# define RTLD_NOW 1
# endif
#endif
static int runAndWait (char **args, char **environ);
#ifdef HAVE_GRP_H
# include <sys/types.h>
# include <grp.h>
#else
/* should be in <grp.h> */
extern void setgrent(void);
extern struct group *getgrent(void);
extern void endgrent(void);
#endif
#ifdef USESHADOW
# if defined(SVR4)
# include <shadow.h>
# else
extern struct spwd *getspnam(GETSPNAM_ARGS);
extern void endspent(void);
# endif
#endif
#if defined(CSRG_BASED) || defined(__GLIBC__) || defined(__UNIXWARE__) || defined(__SCO__)
# include <pwd.h>
# include <unistd.h>
#else
extern struct passwd *getpwnam(GETPWNAM_ARGS);
# ifdef linux
extern void endpwent(void);
# endif
extern char *crypt(CRYPT_ARGS);
#endif
#ifdef USE_PAM
pam_handle_t **
thepamhp(void)
{
static pam_handle_t *pamh = NULL;
return &pamh;
}
pam_handle_t *
thepamh(void)
{
pam_handle_t **pamhp;
pamhp = thepamhp();
if (pamhp)
return *pamhp;
else
return NULL;
}
#endif
static struct dlfuncs dlfuncs = {
PingServer,
SessionPingFailed,
Debug,
RegisterCloseOnFork,
SecureDisplay,
UnsecureDisplay,
ClearCloseOnFork,
SetupDisplay,
LogError,
SessionExit,
DeleteXloginResources,
source,
defaultEnv,
setEnv,
putEnv,
parseArgs,
printEnv,
systemEnv,
LogOutOfMem,
setgrent,
getgrent,
endgrent,
#ifdef USESHADOW
getspnam,
# ifndef QNX4
endspent,
# endif /* QNX4 doesn't use endspent */
#endif
getpwnam,
#if defined(linux) || defined(__GLIBC__)
endpwent,
#endif
crypt,
#ifdef USE_PAM
thepamhp,
#endif
};
static Bool StartClient(
struct verify_info *verify,
struct display *d,
pid_t *pidp,
char *name,
char *passwd);
static pid_t clientPid;
static struct greet_info greet;
static struct verify_info verify;
static Jmp_buf abortSession;
/* ARGSUSED */
static SIGVAL
catchTerm (int n)
{
Longjmp (abortSession, 1);
}
static Jmp_buf pingTime;
/* ARGSUSED */
static SIGVAL
catchAlrm (int n)
{
Longjmp (pingTime, 1);
}
static Jmp_buf tenaciousClient;
/* ARGSUSED */
static SIGVAL
waitAbort (int n)
{
Longjmp (tenaciousClient, 1);
}
#if defined(_POSIX_SOURCE) || defined(SYSV) || defined(SVR4)
# define killpg(pgrp, sig) kill(-(pgrp), sig)
#endif
static void
AbortClient (pid_t pid)
{
int sig = SIGTERM;
volatile int i;
pid_t retId;
for (i = 0; i < 4; i++) {
if (killpg (pid, sig) == -1) {
switch (errno) {
case EPERM:
LogError ("xdm can't kill client\n");
case EINVAL:
case ESRCH:
return;
}
}
if (!Setjmp (tenaciousClient)) {
(void) Signal (SIGALRM, waitAbort);
(void) alarm ((unsigned) 10);
retId = wait ((waitType *) 0);
(void) alarm ((unsigned) 0);
(void) Signal (SIGALRM, SIG_DFL);
if (retId == pid)
break;
} else
(void) Signal (SIGALRM, SIG_DFL);
sig = SIGKILL;
}
}
void
SessionPingFailed (struct display *d)
{
if (clientPid > 1) {
AbortClient (clientPid);
source (verify.systemEnviron, d->reset);
}
SessionExit (d, RESERVER_DISPLAY, TRUE);
}
/*
* We need our own error handlers because we can't be sure what exit code Xlib
* will use, and our Xlib does exit(1) which matches REMANAGE_DISPLAY, which
* can cause a race condition leaving the display wedged. We need to use
* RESERVER_DISPLAY for IO errors, to ensure that the manager waits for the
* server to terminate. For other X errors, we should give up.
*/
/*ARGSUSED*/
static int
IOErrorHandler (Display *dpy)
{
LogError ("fatal IO error %d (%s)\n", errno, _SysErrorMsg(errno));
exit(RESERVER_DISPLAY);
/*NOTREACHED*/
return 0;
}
static int
ErrorHandler(Display *dpy, XErrorEvent *event)
{
LogError ("X error\n");
if (XmuPrintDefaultErrorMessage (dpy, event, stderr) == 0) return 0;
exit(UNMANAGE_DISPLAY);
/*NOTREACHED*/
}
void
ManageSession (struct display *d)
{
static pid_t pid = 0;
Display *dpy;
greet_user_rtn greet_stat;
static GreetUserProc greet_user_proc = NULL;
#ifndef GREET_USER_STATIC
void *greet_lib_handle;
#endif
Debug ("ManageSession %s\n", d->name);
(void)XSetIOErrorHandler(IOErrorHandler);
(void)XSetErrorHandler(ErrorHandler);
#ifndef HAS_SETPROCTITLE
SetTitle(d->name, (char *) 0);
#else
setproctitle("%s", d->name);
#endif
/*
* Load system default Resources
*/
LoadXloginResources (d);
#ifdef GREET_USER_STATIC
greet_user_proc = GreetUser;
#else
Debug ("ManageSession: loading greeter library %s\n", greeterLib);
greet_lib_handle = dlopen(greeterLib, RTLD_NOW);
if (greet_lib_handle != NULL)
greet_user_proc = (GreetUserProc)dlsym(greet_lib_handle, "GreetUser");
if (greet_user_proc == NULL) {
LogError ("%s while loading %s\n", dlerror(), greeterLib);
exit(UNMANAGE_DISPLAY);
}
#endif
/* tell the possibly dynamically loaded greeter function
* what data structure formats to expect.
* These version numbers are registered with The Open Group. */
verify.version = 1;
greet.version = 1;
greet_stat = (*greet_user_proc)(d, &dpy, &verify, &greet, &dlfuncs);
if (greet_stat == Greet_Success) {
clientPid = 0;
if (!Setjmp (abortSession)) {
(void) Signal (SIGTERM, catchTerm);
/*
* Start the clients, changing uid/groups
* setting up environment and running the session
*/
if (StartClient (&verify, d, &clientPid, greet.name, greet.password)) {
Debug ("Client Started\n");
#ifndef GREET_USER_STATIC
/* Save memory; close library */
dlclose(greet_lib_handle);
#endif
/*
* Wait for session to end,
*/
for (;;) {
if (d->pingInterval) {
if (!Setjmp (pingTime)) {
(void) Signal (SIGALRM, catchAlrm);
(void) alarm (d->pingInterval * 60);
pid = wait ((waitType *) 0);
(void) alarm (0);
} else {
(void) alarm (0);
if (!PingServer (d, (Display *) NULL))
SessionPingFailed (d);
}
} else {
pid = wait ((waitType *) 0);
}
if (pid == clientPid)
break;
}
} else {
LogError ("session start failed\n");
}
} else {
/*
* when terminating the session, nuke
* the child and then run the reset script
*/
AbortClient (clientPid);
}
}
/*
* run system-wide reset file
*/
Debug ("Source reset program %s\n", d->reset);
source (verify.systemEnviron, d->reset);
SessionExit (d, OBEYSESS_DISPLAY, TRUE);
}
void
LoadXloginResources (struct display *d)
{
char **args;
char **env = NULL;
if (d->resources[0] && access (d->resources, 4) == 0) {
env = systemEnv (d, (char *) 0, (char *) 0);
args = parseArgs ((char **) 0, d->xrdb);
args = parseArgs (args, d->resources);
Debug ("Loading resource file: %s\n", d->resources);
(void) runAndWait (args, env);
freeArgs (args);
freeEnv (env);
}
}
void
SetupDisplay (struct display *d)
{
char **env = NULL;
if (d->setup && d->setup[0]) {
env = systemEnv (d, (char *) 0, (char *) 0);
(void) source (env, d->setup);
freeEnv (env);
}
}
/*ARGSUSED*/
void
DeleteXloginResources (struct display *d, Display *dpy)
{
int i;
Atom prop = XInternAtom(dpy, "SCREEN_RESOURCES", True);
XDeleteProperty(dpy, RootWindow (dpy, 0), XA_RESOURCE_MANAGER);
if (prop) {
for (i = ScreenCount(dpy); --i >= 0; )
XDeleteProperty(dpy, RootWindow (dpy, i), prop);
}
}
static Jmp_buf syncJump;
/* ARGSUSED */
static SIGVAL
syncTimeout (int n)
{
Longjmp (syncJump, 1);
}
void
SecureDisplay (struct display *d, Display *dpy)
{
Debug ("SecureDisplay %s\n", d->name);
(void) Signal (SIGALRM, syncTimeout);
if (Setjmp (syncJump)) {
LogError ("WARNING: display %s could not be secured\n",
d->name);
SessionExit (d, RESERVER_DISPLAY, FALSE);
}
(void) alarm ((unsigned) d->grabTimeout);
Debug ("Before XGrabServer %s\n", d->name);
XGrabServer (dpy);
if (XGrabKeyboard (dpy, DefaultRootWindow (dpy), True, GrabModeAsync,
GrabModeAsync, CurrentTime) != GrabSuccess) {
(void) alarm (0);
(void) Signal (SIGALRM, SIG_DFL);
LogError ("WARNING: keyboard on display %s could not be secured\n",
d->name);
SessionExit (d, RESERVER_DISPLAY, FALSE);
}
Debug ("XGrabKeyboard succeeded %s\n", d->name);
(void) alarm (0);
(void) Signal (SIGALRM, SIG_DFL);
pseudoReset (dpy);
if (!d->grabServer) {
XUngrabServer (dpy);
XSync (dpy, 0);
}
Debug ("done secure %s\n", d->name);
}
void
UnsecureDisplay (struct display *d, Display *dpy)
{
Debug ("Unsecure display %s\n", d->name);
if (d->grabServer) {
XUngrabServer (dpy);
XSync (dpy, 0);
}
}
void
SessionExit (struct display *d, int status, int removeAuth)
{
#ifdef USE_PAM
pam_handle_t *pamh = thepamh();
if (pamh) {
/* shutdown PAM session */
pam_close_session(pamh, 0);
pam_end(pamh, PAM_SUCCESS);
pamh = NULL;
}
#endif
/* make sure the server gets reset after the session is over */
if (d->serverPid >= 2 && d->resetSignal)
kill (d->serverPid, d->resetSignal);
else
ResetServer (d);
if (removeAuth) {
if (setgid (verify.gid) == -1) {
LogError( "SessionExit: setgid: %s\n", strerror(errno));
exit(status);
}
if (setuid (verify.uid) == -1) {
LogError( "SessionExit: setuid: %s\n", strerror(errno));
exit(status);
}
RemoveUserAuthorization (d, &verify);
#if defined(K5AUTH) && !defined(USE_PAM) /* PAM modules should handle this */
/* do like "kdestroy" program */
{
krb5_error_code code;
krb5_ccache ccache;
code = Krb5DisplayCCache(d->name, &ccache);
if (code)
LogError ("%s while getting Krb5 ccache to destroy\n",
error_message(code));
else {
code = krb5_cc_destroy(ccache);
if (code) {
if (code == KRB5_FCC_NOFILE) {
Debug ("No Kerberos ccache file found to destroy\n");
} else
LogError ("%s while destroying Krb5 credentials cache\n",
error_message(code));
} else
Debug ("Kerberos ccache destroyed\n");
krb5_cc_close(ccache);
}
}
#endif /* K5AUTH */
}
Debug ("Display %s exiting with status %d\n", d->name, status);
exit (status);
}
static Bool
StartClient (
struct verify_info *verify,
struct display *d,
pid_t *pidp,
char *name,
char *passwd)
{
char **f, *home;
char *failsafeArgv[2];
pid_t pid;
#ifdef HAS_SETUSERCONTEXT
struct passwd* pwd;
#endif
#ifdef USE_PAM
pam_handle_t *pamh = thepamh ();
int pam_error;
#endif
#ifdef USESECUREWARE
char *reason, **smpenv, *smpshell;
int ret;
extern struct smp_user_info *userp;
#endif
if (verify->argv) {
Debug ("StartSession %s: ", verify->argv[0]);
for (f = verify->argv; *f; f++)
Debug ("%s ", *f);
Debug ("; ");
}
if (verify->userEnviron) {
for (f = verify->userEnviron; *f; f++)
Debug ("%s ", *f);
Debug ("\n");
}
#ifdef USE_PAM
if (pamh) pam_open_session(pamh, 0);
#endif
switch (pid = fork ()) {
case 0:
CleanUpChild ();
#ifdef XDMCP
/* The chooser socket is not closed by CleanUpChild() */
DestroyWellKnownSockets();
#endif
/* Do system-dependent login setup here */
#ifdef USESECUREWARE
Debug ("set_identity: uid=%d\n", userp->pw.pw_uid);
ret = smp_set_identity (userp, &reason, &smpenv, &smpshell);
Debug ("smp_set_identity returns %d luid=%d\n", ret, getluid());
switch (ret) {
case SMP_FAIL:
LogError ("Unable to set identity\n");
smp_audit_fail (userp, 0);
return 0;
case SMP_EXTFAIL:
LogError ("Unable to set identity: %s\n", reason);
smp_audit_fail (userp, 0);
return 0;
case SMP_NOTAUTH:
LogError ("Authorization failed\n");
smp_audit_fail (userp, 0);
return 0;
case SMP_ACCTLOCK:
LogError ("Account is locked\n");
smp_audit_fail (userp, 0);
return 0;
case SMP_COMPLETE:
break;
default:
LogError ("Unhandled identity error %d\n", ret);
smp_audit_fail (userp, 0);
return 0;
}
#endif
#ifndef AIXV3
# ifndef HAS_SETUSERCONTEXT
if (setgid (verify->gid) < 0) {
LogError ("setgid %d (user \"%s\") failed: %s\n",
verify->gid, name, _SysErrorMsg (errno));
return (0);
}
# if defined(BSD) && (BSD >= 199103)
if (setlogin (name) < 0) {
LogError ("setlogin for \"%s\" failed: %s\n",
name, _SysErrorMsg (errno));
return (0);
}
# endif
# ifndef QNX4
if (initgroups (name, verify->gid) < 0) {
LogError ("initgroups for \"%s\" failed: %s\n",
name, _SysErrorMsg (errno));
return (0);
}
# endif /* QNX4 doesn't support multi-groups, no initgroups() */
# endif /* !HAS_SETUSERCONTEXT */
# ifdef USE_PAM
if (pamh) {
long i;
char **pam_env;
pam_error = pam_setcred (pamh, PAM_ESTABLISH_CRED);
if (pam_error != PAM_SUCCESS) {
LogError ("pam_setcred for \"%s\" failed: %s\n",
name, pam_strerror(pamh, pam_error));
return(0);
}
/* pass in environment variables set by libpam and modules it called */
pam_env = pam_getenvlist(pamh);
for(i = 0; pam_env && pam_env[i]; i++) {
verify->userEnviron = putEnv(pam_env[i], verify->userEnviron);
}
}
# endif
# ifndef HAS_SETUSERCONTEXT
if (setuid(verify->uid) < 0) {
LogError ("setuid %d (user \"%s\") failed: %s\n",
verify->uid, name, _SysErrorMsg (errno));
return (0);
}
# else /* HAS_SETUSERCONTEXT */
/*
* Set the user's credentials: uid, gid, groups,
* environment variables, resource limits, and umask.
*/
pwd = getpwnam(name);
if (pwd) {
if (setusercontext(NULL, pwd, pwd->pw_uid, LOGIN_SETALL) < 0) {
LogError ("setusercontext for \"%s\" failed: %s\n",
name, _SysErrorMsg (errno));
return (0);
}
endpwent();
} else {
LogError ("getpwnam for \"%s\" failed: %s\n",
name, _SysErrorMsg (errno));
return (0);
}
# endif /* HAS_SETUSERCONTEXT */
#else /* AIXV3 */
/*
* Set the user's credentials: uid, gid, groups,
* audit classes, user limits, and umask.
*/
if (setpcred(name, NULL) == -1) {
LogError ("setpcred for \"%s\" failed: %s\n",
name, _SysErrorMsg (errno));
return (0);
}
#endif /* AIXV3 */
#ifndef USE_PAM /* PAM modules should handle these */
/*
* for user-based authorization schemes,
* use the password to get the user's credentials.
*/
# ifdef SECURE_RPC
/* do like "keylogin" program */
{
char netname[MAXNETNAMELEN+1], secretkey[HEXKEYBYTES+1];
int nameret, keyret;
int len;
struct key_netstarg netst;
int key_set_ok = 0;
nameret = getnetname (netname);
Debug ("User netname: %s\n", netname);
len = strlen (passwd);
if (len > 8)
bzero (passwd + 8, len - 8);
keyret = getsecretkey(netname,secretkey,passwd);
Debug ("getsecretkey returns %d, key length %d\n",
keyret, strlen (secretkey));
memcpy(&(netst.st_priv_key), secretkey, HEXKEYBYTES);
netst.st_netname = strdup(netname);
memset(netst.st_pub_key, 0, HEXKEYBYTES);
if (key_setnet(&netst) < 0) {
Debug ("Could not set secret key.\n");
}
free(netst.st_netname);
/* is there a key, and do we have the right password? */
if (keyret == 1) {
if (*secretkey) {
keyret = key_setsecret(secretkey);
Debug ("key_setsecret returns %d\n", keyret);
if (keyret == -1)
LogError ("failed to set NIS secret key\n");
else
key_set_ok = 1;
} else {
/* found a key, but couldn't interpret it */
LogError ("password incorrect for NIS principal \"%s\"\n",
nameret ? netname : name);
}
}
if (!key_set_ok) {
/* remove SUN-DES-1 from authorizations list */
int i, j;
for (i = 0; i < d->authNum; i++) {
if (d->authorizations[i]->name_length == 9 &&
memcmp(d->authorizations[i]->name, "SUN-DES-1", 9) == 0) {
for (j = i+1; j < d->authNum; j++)
d->authorizations[j-1] = d->authorizations[j];
d->authNum--;
break;
}
}
}
bzero(secretkey, strlen(secretkey));
}
# endif
# ifdef K5AUTH
/* do like "kinit" program */
{
int i, j;
int result;
extern char *Krb5CCacheName();
result = Krb5Init(name, passwd, d);
if (result == 0) {
/* point session clients at the Kerberos credentials cache */
verify->userEnviron =
setEnv(verify->userEnviron,
"KRB5CCNAME", Krb5CCacheName(d->name));
} else {
for (i = 0; i < d->authNum; i++) {
if (d->authorizations[i]->name_length == 14 &&
memcmp(d->authorizations[i]->name, "MIT-KERBEROS-5", 14) == 0) {
/* remove Kerberos from authorizations list */
for (j = i+1; j < d->authNum; j++)
d->authorizations[j-1] = d->authorizations[j];
d->authNum--;
break;
}
}
}
}
# endif /* K5AUTH */
#endif /* !USE_PAM */
if (d->windowPath)
verify->userEnviron = setEnv(verify->userEnviron, "WINDOWPATH", d->windowPath);
if (passwd != NULL)
bzero(passwd, strlen(passwd));
SetUserAuthorization (d, verify);
home = getEnv (verify->userEnviron, "HOME");
if (home)
if (chdir (home) == -1) {
LogError ("user \"%s\": cannot chdir to home \"%s\" (err %d), using \"/\"\n",
getEnv (verify->userEnviron, "USER"), home, errno);
chdir ("/");
verify->userEnviron = setEnv(verify->userEnviron, "HOME", "/");
}
if (verify->argv) {
Debug ("executing session %s\n", verify->argv[0]);
execute (verify->argv, verify->userEnviron);
LogError ("Session \"%s\" execution failed (err %d)\n", verify->argv[0], errno);
} else {
LogError ("Session has no command/arguments\n");
}
failsafeArgv[0] = d->failsafeClient;
failsafeArgv[1] = NULL;
execute (failsafeArgv, verify->userEnviron);
exit (1);
case -1:
if (passwd != NULL)
bzero(passwd, strlen(passwd));
Debug ("StartSession, fork failed\n");
LogError ("can't start session on \"%s\", fork failed: %s\n",
d->name, _SysErrorMsg (errno));
return 0;
default:
if (passwd != NULL)
bzero(passwd, strlen(passwd));
Debug ("StartSession, fork succeeded %d\n", pid);
*pidp = pid;
return 1;
}
}
int
source (char **environ, char *file)
{
char **args, *args_safe[2];
int ret;
if (file && file[0]) {
Debug ("source %s\n", file);
args = parseArgs ((char **) 0, file);
if (!args) {
args = args_safe;
args[0] = file;
args[1] = NULL;
}
ret = runAndWait (args, environ);
freeArgs (args);
return ret;
}
return 0;
}
static int
runAndWait (char **args, char **environ)
{
pid_t pid;
waitType result;
switch (pid = fork ()) {
case 0:
CleanUpChild ();
#ifdef XDMCP
/* The chooser socket is not closed by CleanUpChild() */
DestroyWellKnownSockets();
#endif
execute (args, environ);
LogError ("can't execute \"%s\" (err %d)\n", args[0], errno);
exit (1);
case -1:
Debug ("fork failed\n");
LogError ("can't fork to execute \"%s\" (err %d)\n", args[0], errno);
return 1;
default:
while (wait (&result) != pid)
/* SUPPRESS 530 */
;
break;
}
return waitVal (result);
}
void
execute (char **argv, char **environ)
{
int err;
/* give /dev/null as stdin */
(void) close (0);
open ("/dev/null", O_RDONLY);
/* make stdout follow stderr to the log file */
dup2 (2,1);
Debug ("attempting to execve() %s\n", argv[0]);
execve (argv[0], argv, environ);
err = errno;
Debug ("execve() of %s failed: %s\n", argv[0], _SysErrorMsg (errno));
/*
* In case this is a shell script which hasn't been
* made executable (or this is a SYSV box), do
* a reasonable thing
*/
if (err != ENOENT) {
char program[1024], *e, *p, *optarg;
FILE *f;
char **newargv, **av;
int argc;
/*
* emulate BSD kernel behaviour -- read
* the first line; check if it starts
* with "#!", in which case it uses
* the rest of the line as the name of
* program to run. Else use "/bin/sh".
*/
f = fopen (argv[0], "r");
if (!f)
return;
if (fgets (program, sizeof (program) - 1, f) == NULL) {
fclose (f);
return;
}
fclose (f);
e = program + strlen (program) - 1;
if (*e == '\n')
*e = '\0';
if (!strncmp (program, "#!", 2)) {
p = program + 2;
while (*p && isspace (*p))
++p;
optarg = p;
while (*optarg && !isspace (*optarg))
++optarg;
if (*optarg) {
*optarg = '\0';
do
++optarg;
while (*optarg && isspace (*optarg));
} else
optarg = NULL;
} else {
p = "/bin/sh";
optarg = NULL;
}
Debug ("Shell script execution: %s (optarg %s)\n",
p, optarg ? optarg : "(null)");
for (av = argv, argc = 0; *av; av++, argc++)
/* SUPPRESS 530 */
;
newargv = (char **) malloc ((argc + (optarg ? 3 : 2)) * sizeof (char *));
if (!newargv)
return;
av = newargv;
*av++ = p;
if (optarg)
*av++ = optarg;
/* SUPPRESS 560 */
while ((*av++ = *argv++))
/* SUPPRESS 530 */
;
Debug ("Attempting to execve() %s\n", newargv[0]);
execve (newargv[0], newargv, environ);
}
}
char **
defaultEnv (void)
{
char **env, **exp, *value;
env = NULL;
for (exp = exportList; exp && *exp; ++exp) {
value = getenv (*exp);
if (value)
env = setEnv (env, *exp, value);
}
return env;
}
char **
systemEnv (struct display *d, char *user, char *home)
{
char **env;
env = defaultEnv ();
env = setEnv (env, "DISPLAY", d->name);
if (home)
env = setEnv (env, "HOME", home);
if (user) {
env = setEnv (env, "USER", user);
env = setEnv (env, "LOGNAME", user);
}
env = setEnv (env, "PATH", d->systemPath);
env = setEnv (env, "SHELL", d->systemShell);
if (d->authFile)
env = setEnv (env, "XAUTHORITY", d->authFile);
if (d->windowPath)
env = setEnv (env, "WINDOWPATH", d->windowPath);
return env;
}
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