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/*-----------------------------------------------------------------
* haserl functions specific to a bash/ash/dash shell
* Copyright (c) 2003-2007 Nathan Angelacos (nangel@users.sourceforge.net)
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2, as published by the Free
* Software Foundation.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
------------------------------------------------------------------------- */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <getopt.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <stdlib.h>
#include <string.h>
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#include "common.h"
#include "h_error.h"
#include "h_bash.h"
#include "h_script.h"
#include "haserl.h"
#ifdef DEBUG
#include <syslog.h>
#endif
/* Local subshell variables */
static int subshell_pipe[2];
static int subshell_pid;
void
bash_open (char *shell)
{
int retcode = 0;
int count;
argv_t *argv;
char *av[20];
if (shell == NULL)
return;
retcode = pipe (&subshell_pipe[PARENT_IN]);
if (retcode == 0)
{
subshell_pid = fork ();
if (subshell_pid == -1)
{
die_with_message (NULL, NULL, g_err_msg[E_SUBSHELL_FAIL]);
}
if (subshell_pid == 0)
{
/* I'm the child, connect stdin to the parent */
dup2 (subshell_pipe[PARENT_IN], STDIN_FILENO);
close (subshell_pipe[PARENT_IN]);
count = argc_argv (shell, &argv, "");
if (count > 19)
{
/* over 20 command line args, silently truncate */
av[19] = "\0";
count = 18;
}
while (count >= 0)
{
av[count] = argv[count].string;
count--;
}
execv (argv[0].string, av);
free (argv);
/* if we get here, we had a failure */
die_with_message (NULL, NULL, g_err_msg[E_SUBSHELL_FAIL]);
}
else
{
/* I'm parent, move along please */
}
}
/* control should get to this point only in the parent.
*/
}
void
bash_destroy (void)
{
int status;
waitpid (subshell_pid, &status, 0);
}
void
bash_exec (buffer_t * buf, char *str)
{
buffer_add (buf, str, strlen (str));
return;
}
/* Run the echo command in a subshell */
void
bash_echo (buffer_t * buf, char *str, size_t len)
{
/* limits.h would tell us the ARG_MAX characters we COULD send to the echo command, but
* we will take the (ancient) POSIX1 standard of 4K, subtract 1K from it and use that
* as the maxmimum. The Linux limit appears to be 128K, so 3K will fit. */
static char echo_start[] = "echo -n '";
static char echo_quote[] = "'\\''";
static char echo_end[] = "'\n";
const size_t maxlen = 3096;
size_t pos;
if (len == 0)
return;
pos = 0;
buffer_add (buf, echo_start, strlen (echo_start));
while (pos < len)
{
if (str[pos] == '\'')
buffer_add (buf, echo_quote, strlen (echo_quote));
else
buffer_add (buf, str + pos, 1);
pos++;
if ((pos % maxlen) == 0)
{
buffer_add (buf, echo_end, strlen (echo_end));
buffer_add (buf, echo_start, strlen (echo_start));
}
}
buffer_add (buf, echo_end, strlen (echo_end));
}
/* do an evaluation in a subshell */
void
bash_eval (buffer_t * buf, char *str, size_t len)
{
static char echo_start[] = "echo -n ";
static char echo_end[] = "\n";
if (len == 0)
return;
buffer_add (buf, echo_start, strlen (echo_start));
buffer_add (buf, str, len);
buffer_add (buf, echo_end, strlen (echo_end));
}
void
bash_setup (char *shell, list_t * env)
{
list_t *next;
/* populate the environment */
while (env)
{
next = env->next;
putenv (env->buf);
env = next;
}
/* start the subshell */
bash_open (shell);
}
void
bash_doscript (buffer_t * script, char *name)
{
static char postfix[] = "\nexit\n";
/* dump the script to the subshell */
write (subshell_pipe[PARENT_OUT], script->data, script->ptr - script->data);
/* write the postfix */
write (subshell_pipe[PARENT_OUT], postfix, strlen (postfix));
return;
}
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