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https://github.com/edeproject/ede.git
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Importing EDE2 code to svn... NOTE: It doesn't compile! Stuff thats broken: edewm, eworkpanel, eiconman,
emenueditor
This commit is contained in:
Vedran Ljubovic
237
edelib2/Run.cpp
Executable file
237
edelib2/Run.cpp
Executable file
@ -0,0 +1,237 @@
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/*
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* $Id$
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*
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* edelib::Run - Library for executing external programs
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* Part of Equinox Desktop Environment (EDE).
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* Copyright (c) 2000-2006 EDE Authors.
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*
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* This program is licenced under terms of the
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* GNU General Public Licence version 2 or newer.
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* See COPYING for details.
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*/
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#define PREFIX "/usr"
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#include "Run.h"
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#include "Config.h"
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#include <fltk/ask.h>
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#include "NLS.h"
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#include "process.h"
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using namespace fltk;
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using namespace edelib;
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// GLOBAL NOTE: asprintf() is a GNU extension which is also available under *BSD
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// If this is considered a problem, use our tasprintf() instead (in Util.h)
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// --------------------------------------------
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// Start a process using exec(3)
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// This means that there is no handling or control over process,
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// it's just forked into background. If you need to chat with
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// program or use its output, see edelib::PtyProcess
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// --------------------------------------------
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int run_fork(const char *cmd, bool wait)
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{
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int pid, status;
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int nulldev;
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extern char **environ;
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status=0;
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if (cmd == NULL)
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return (EDERUN_EMPTY);
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pid = fork ();
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if (pid == -1)
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return (EDERUN_FORK_FAILED);
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if (pid == 0)
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{
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char *argv[4];
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// child
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argv[0] = "sh";
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argv[1] = "-c";
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argv[2] = (char*)cmd;
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argv[3] = NULL;
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// The following is to avoid X locking when executing
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// terminal based application that requires user input
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if ((nulldev = open ("/dev/null", O_RDWR)))
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{
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close (0); dup (nulldev);
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close (1); dup (nulldev);
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close (2); dup (nulldev);
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}
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if (execve ("/bin/sh", argv, environ) == -1)
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perror ("/bin/sh");
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_exit (EDERUN_EXECVE_FAILED);
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}
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do
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{
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if ((wait) && (waitpid (pid, &status, 0) == -1))
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{
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if (errno != EINTR)
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return (EDERUN_WAITPID_FAILED);
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}
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else {
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if (status==127) status=EDERUN_NOT_FOUND;
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if (status==126) status=EDERUN_NOT_EXEC;
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return status;
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}
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}
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while (1);
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return 0;
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}
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// --------------------------------------------
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// Start a process as root user
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// We use edelib::PtyProcess to chat with su/sudo. Afterwards
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// the program continues undisturbed
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// --------------------------------------------
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// this is our internal message:
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#define CONTMSG "elauncher_ok_to_continue"
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// these are part of sudo/su chat:
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#define PWDQ "Password:"
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#define BADPWD "/bin/su: incorrect password"
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#define SUDOBADPWD "Sorry, try again."
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int run_as_root(const char *cmd, bool wait)
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{
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// -- we could check for availibility of sudo, but there's no point
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bool use_sudo = false;
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Config pGlobalConfig(find_config_file("ede.conf", 0));
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pGlobalConfig.set_section("System");
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pGlobalConfig.read("UseSudo", use_sudo, false);
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// Prepare array as needed by exec()
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char *parts[4];
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if (use_sudo) {
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parts[0] = "/bin/sudo";
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parts[1] = "";
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// This "continue message" prevents accidentally exposing password
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asprintf(&parts[2], "echo %s; %s", CONTMSG, cmd);
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parts[3] = NULL;
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} else {
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parts[0] = "/bin/su";
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parts[1] = "-c";
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// This "continue message" prevents accidentally exposing password
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asprintf(&parts[2], "echo %s; %s", CONTMSG, cmd);
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parts[3] = NULL;
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}
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// the actual command is this:
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// cmd_ = strtok(cmd," ");
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tryagain:
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PtyProcess *child = new PtyProcess();
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child->setEnvironment((const char**)environ);
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if (child->exec(parts[0], (const char**)parts) < 0) {
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return EDERUN_PTY_FAILED;
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}
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// Wait for process to actually start. Shouldn't last long
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while (1) {
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int p = child->pid();
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if (p != 0 && child->checkPid(p))
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break;
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int exit = child->checkPidExited(p);
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if (exit != -2) {
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// Process is DOA
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fprintf (stderr, "Edelib: Process has died unexpectedly! Exit status: %d\n",exit);
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delete child;
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goto tryagain;
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}
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fprintf (stderr, "Edelib: Process not started yet...\n");
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}
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// Run program as root using su or sudo
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char *line;
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// TODO: fix password dialog so that Cancel can be detected
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// At the moment it's impossible to tell if the password is blank
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const char *pwd = password(_("This program requires administrator privileges.\nPlease enter your password below:"));
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// Chat routine
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while (1) {
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line = child->readLine();
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// This covers other cases of failed process startup
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// Our su command should at least produce CONTMSG
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if (line == 0 && child->checkPidExited(child->pid()) != PtyProcess::NotExited) {
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// TODO: capture stdout? as in sudo error?
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fprintf (stderr, "Edelib: su process has died unexpectedly in chat stage!\n");
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delete child;
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if (choice_alert (_("Failed to start authentication. Try again"), 0, _("Yes"), _("No")) == 2) return 0;
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goto tryagain;
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}
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if (strncasecmp(line,PWDQ,strlen(PWDQ))== 0)
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child->writeLine(pwd,true);
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if (strncasecmp(line,CONTMSG,strlen(CONTMSG)) == 0)
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break; // program starts...
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if ((strncasecmp(line,BADPWD,strlen(BADPWD)) == 0) || (strncasecmp(line,SUDOBADPWD,strlen(SUDOBADPWD)) == 0)) {
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// end process
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child->waitForChild();
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delete child;
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if (choice_alert (_("The password is wrong. Try again?"), 0, _("Yes"), _("No")) == 2) return 0;
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goto tryagain;
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}
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}
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// Wait for program to end, discarding output
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int child_val = child->waitForChild();
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if (child_val==127) child_val=EDERUN_NOT_FOUND;
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if (child_val==126) child_val=EDERUN_NOT_EXEC;
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// deallocate one string we allocated
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free(parts[2]);
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delete child;
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return child_val;
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}
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static bool done_checks=false;
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static bool elauncher_found=false;
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// Check availability of various necessary components
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// For the moment just elauncher :)
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void do_checks()
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{
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struct stat *buf = (struct stat*)malloc(sizeof(struct stat));
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if (stat (PREFIX"/bin/elauncher", buf) == 0)
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elauncher_found = true;
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else
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elauncher_found = false;
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}
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int edelib::run_program(const char *path, bool wait, bool root, bool use_elauncher)
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{
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char *execstr;
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if (!done_checks) do_checks();
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if (use_elauncher && elauncher_found) {
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if (root)
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asprintf(&execstr,"elauncher --root \"%s\"", path);
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else
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asprintf(&execstr,"elauncher \"%s\"", path);
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run_fork (execstr, false); // elauncher can't wait
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} else {
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if (root)
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return run_as_root(path, wait);
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else
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return run_fork(path, wait);
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}
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return 0; // shutup compiler!
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}
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