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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#include "common-internal.h"
#include "handler_cgi.h"
#include "util.h"

#ifdef HAVE_STDARG_H
# include <stdarg.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>

#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif

#include "module.h"
#include "connection.h"
#include "connection-protected.h"
#include "socket.h"
#include "server.h"
#include "server-protected.h"
#include "header.h"
#include "header-protected.h"
#include "post.h"
#include "error_log.h"

#define ENTRIES "handler,cgi"

#ifdef _WIN32
# define fork_and_execute_cgi(c) fork_and_execute_cgi_win32(c)
static ret_t fork_and_execute_cgi_win32 (cherokee_handler_cgi_t *cgi);
#else
# define fork_and_execute_cgi(c) fork_and_execute_cgi_unix(c)
static ret_t fork_and_execute_cgi_unix (cherokee_handler_cgi_t *cgi);
#endif

#define set_env(cgi,k,v,vl) cherokee_handler_cgi_add_env_pair(cgi, k, sizeof(k)-1, v, vl)


/* Plugin initialization
*/
CGI_LIB_INIT (cgi, http_get | http_post | http_head);



static ret_t
read_from_cgi (cherokee_handler_cgi_base_t *cgi_base, cherokee_buffer_t *buffer)
{
ret_t ret;
  size_t read_ = 0;
cherokee_handler_cgi_t *cgi = HDL_CGI(cgi_base);

/* Sanity check: pipe() accessed
*/
if (unlikely (cgi->pipeInput < 0))
return ret_eof;

/* Read the data from the pipe:
*/
ret = cherokee_buffer_read_from_fd (buffer, cgi->pipeInput, 4096, &read_);

TRACE (ENTRIES, "read... ret=%d %d\n", ret, read_);

switch (ret) {
case ret_eagain:
cherokee_thread_deactive_to_polling (HANDLER_THREAD(cgi),
HANDLER_CONN(cgi), cgi->pipeInput,
FDPOLL_MODE_READ, false);
return ret_eagain;

case ret_ok:
TRACE (ENTRIES, "%d bytes read\n", read_);
return ret_ok;

case ret_eof:
case ret_error:
cgi_base->got_eof = true;
return ret;

default:
RET_UNKNOWN(ret);
}

SHOULDNT_HAPPEN;
return ret_error;
}


ret_t
cherokee_handler_cgi_new (cherokee_handler_t **hdl, void *cnt, cherokee_module_props_t *props)
{
int i;
CHEROKEE_NEW_STRUCT (n, handler_cgi);

/* Init the base class
*/
cherokee_handler_cgi_base_init (HDL_CGI_BASE(n), cnt, PLUGIN_INFO_HANDLER_PTR(cgi),
HANDLER_PROPS(props), cherokee_handler_cgi_add_env_pair, read_from_cgi);

/* Virtual methods
*/
MODULE(n)->init = (module_func_init_t) cherokee_handler_cgi_init;
MODULE(n)->free = (module_func_free_t) cherokee_handler_cgi_free;
HANDLER(n)->read_post = (handler_func_read_post_t) cherokee_handler_cgi_read_post;

/* Virtual methods: implemented by handler_cgi_base
*/
HANDLER(n)->add_headers = (handler_func_add_headers_t) cherokee_handler_cgi_base_add_headers;
HANDLER(n)->step = (handler_func_step_t) cherokee_handler_cgi_base_step;

/* Init
*/
n->pipeInput = -1;
n->pipeOutput = -1;

#ifdef _WIN32
n->process = NULL;
n->thread = NULL;

cherokee_buffer_init (&n->envp);
#else
n->pid = -1;
n->envp_last = 0;

for (i=0; i<ENV_VAR_NUM; i++)
n->envp[i] = NULL;
#endif

/* Return the object
*/
*hdl = HANDLER(n);
return ret_ok;
}


static int
do_reap (void)
{
pid_t pid;
int status;
int child_count = 0;

#ifndef _WIN32

/* Reap defunct children until there aren't any more.
*/
for (child_count = 0; ; ++child_count) {

pid = waitpid (-1, &status, WNOHANG);

/* none left */
if (pid == 0)
break;
else
if (pid < 0) {
/* because of ptrace */
if (errno == EINTR)
continue;
break;
}
}
#endif

return child_count;
}


ret_t
cherokee_handler_cgi_free (cherokee_handler_cgi_t *cgi)
{
  int i;

/* Free the rest of the handler CGI memory
*/
cherokee_handler_cgi_base_free (HDL_CGI_BASE(cgi));

/* Close the connection with the CGI
*/
if (cgi->pipeInput > 0) {
cherokee_fd_close (cgi->pipeInput);
cgi->pipeInput = -1;
}

if (cgi->pipeOutput > 0) {
cherokee_fd_close (cgi->pipeOutput);
cgi->pipeOutput = -1;
}

        /* Kill the CGI
*/
#ifndef _WIN32
if (cgi->pid > 0) {
pid_t pid;
cint_t tries = 2;

while (true) {
do {
pid = waitpid (cgi->pid, NULL, WNOHANG);
} while ((pid == 1) && (errno == EINTR));

if (pid > 0) {
/* Ok */
break;
} else if (errno == ECHILD) {
/* Already death */
break;
}

/* Failed */
kill (cgi->pid, SIGTERM);

tries--;
if (tries < 0)
break;
}
}
#else
if (cgi->process) {
WaitForSingleObject (cgi->process, INFINITE);
CloseHandle (cgi->process);
}

if (cgi->thread) {
CloseHandle (cgi->thread);
}
#endif

        /* Free the environment variables
*/
#ifdef _WIN32
cherokee_buffer_mrproper (&cgi->envp);
#else
for (i=0; i<cgi->envp_last; i++) {
free (cgi->envp[i]);
cgi->envp[i] = NULL;
}
#endif

/* For some reason, we have seen that the SIGCHLD signal does not call to
* our handler in a server with a lot of requests, so the wait() call,
* necessary to free the resources used by the CGI, is not called. So I
* think that a possible solution couble be to put the waitpid call in the
* _free method of this handler, so when the handler ends, this will free
* the resources used by our cool CGI.
*/
do_reap();

return ret_ok;
}


ret_t
cherokee_handler_cgi_props_free (cherokee_handler_cgi_props_t *props)
{
return cherokee_handler_cgi_base_props_free (PROP_CGI_BASE(props));
}


ret_t
cherokee_handler_cgi_configure (cherokee_config_node_t *conf, cherokee_server_t *srv, cherokee_module_props_t **_props)
{
cherokee_handler_cgi_props_t *props;

/* Instance a new property object
*/
if (*_props == NULL) {
CHEROKEE_NEW_STRUCT (n, handler_cgi_props);

cherokee_handler_cgi_base_props_init_base (PROP_CGI_BASE(n),
MODULE_PROPS_FREE(cherokee_handler_cgi_props_free));
*_props = MODULE_PROPS(n);
}

props = PROP_CGI(*_props);

/* Parse local options
*/
return cherokee_handler_cgi_base_configure (conf, srv, _props);
}


void
cherokee_handler_cgi_add_env_pair (cherokee_handler_cgi_base_t *cgi_base,
const char *name, int name_len,
const char *content, int content_len)
{
cherokee_handler_cgi_t *cgi = HDL_CGI(cgi_base);

#ifdef _WIN32
cherokee_buffer_add_va (&cgi->envp, "%s=%s", name, content);
cherokee_buffer_add (&cgi->envp, "\0", 1);
#else
char *entry;

/* Build the new envp entry
*/
if (name == NULL)
return;

entry = (char *) malloc (name_len + content_len + 2);
if (entry == NULL)
return;

memcpy (entry, name, name_len);
entry[name_len] = '=';

memcpy (entry + name_len + 1, content, content_len);

entry[name_len+content_len+1] = '\0';

/* Set it in the table
*/
cgi->envp[cgi->envp_last] = entry;
cgi->envp_last++;

/* Sanity check
*/
if (cgi->envp_last >= ENV_VAR_NUM) {
SHOULDNT_HAPPEN;
}
#endif
}

static ret_t
add_environment (cherokee_handler_cgi_t *cgi,
cherokee_connection_t *conn)
{
ret_t ret;
cherokee_handler_cgi_base_t *cgi_base = HDL_CGI_BASE(cgi);
cherokee_buffer_t *tmp = THREAD_TMP_BUF2(CONN_THREAD(conn));

ret = cherokee_handler_cgi_base_build_envp (HDL_CGI_BASE(cgi), conn);
if (unlikely (ret != ret_ok))
return ret;

/* CONTENT_LENGTH
*/
if (conn->post.has_info) {
cherokee_buffer_clean (tmp);
cherokee_buffer_add_ullong10 (tmp, conn->post.len);
set_env (cgi_base, "CONTENT_LENGTH", tmp->buf, tmp->len);
}

/* SCRIPT_FILENAME
*/
if (cgi_base->executable.len <= 0)
return ret_error;

set_env (cgi_base, "SCRIPT_FILENAME",
cgi_base->executable.buf,
cgi_base->executable.len);

return ret_ok;
}


ret_t
cherokee_handler_cgi_init (cherokee_handler_cgi_t *cgi)
{
ret_t ret;
cherokee_handler_cgi_base_t *cgi_base = HDL_CGI_BASE(cgi);
cherokee_connection_t *conn = HANDLER_CONN(cgi);

switch (cgi_base->init_phase) {
case hcgi_phase_build_headers:

/* Extracts PATH_INFO and filename from request uri
*/
if (cherokee_buffer_is_empty (&cgi_base->executable)) {
ret = cherokee_handler_cgi_base_extract_path (cgi_base, true);
if (unlikely (ret < ret_ok)) {
return ret;
}
}

/* It has to update the timeout of the connection,
* otherwhise the server will drop it for the CGI
* isn't fast enough
*/
conn->timeout = cherokee_bogonow_now + CGI_TIMEOUT;
cgi_base->init_phase = hcgi_phase_connect;

case hcgi_phase_connect:
/* Launch the CGI
*/
ret = fork_and_execute_cgi(cgi);
if (unlikely (ret != ret_ok)) {
return ret;
}

default:
break;
}

TRACE (ENTRIES, "finishing %s\n", "ret_ok");
return ret_ok;
}


ret_t
cherokee_handler_cgi_read_post (cherokee_handler_cgi_t *cgi)
{
ret_t ret;
cherokee_connection_t *conn = HANDLER_CONN(cgi);
cherokee_socket_status_t blocking = socket_closed;
cherokee_boolean_t did_IO = false;

if (! conn->post.has_info) {
return ret_ok;
}

ret = cherokee_post_send_to_fd (&conn->post, &conn->socket,
cgi->pipeOutput, NULL, &blocking, &did_IO);

if (did_IO) {
cherokee_connection_update_timeout (conn);
}

switch (ret) {
case ret_ok:
break;
case ret_eagain:
if (blocking == socket_writing) {
cherokee_thread_deactive_to_polling (HANDLER_THREAD(cgi),
conn, cgi->pipeOutput,
FDPOLL_MODE_WRITE, false);
return ret_deny;
}

/* ret_eagain - Block on read
* ret_deny - Block on back-end write
*/
if (cherokee_post_has_buffered_info (&conn->post)) {
return ret_deny;
}
return ret_eagain;

default:
return ret;
}

TRACE (ENTRIES",post", "%s\n", "finished");
cherokee_fd_close (cgi->pipeOutput);
cgi->pipeOutput = -1;

return ret_ok;
}


/*******************************
* UNIX: Linux, Solaris, etc.. *
*******************************/

#ifndef _WIN32

static ret_t
_fd_set_properties (int fd, int add_flags, int remove_flags)
{
int flags;

flags = fcntl (fd, F_GETFL, 0);

flags |= add_flags;
flags &= ~remove_flags;

if (fcntl (fd, F_SETFL, flags) == -1) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_HANDLER_CGI_SET_PROP, fd);
return ret_error;
}

return ret_ok;
}


static NORETURN void
manage_child_cgi_process (cherokee_handler_cgi_t *cgi, int pipe_cgi[2], int pipe_server[2])
{
/* Child process
*/
int re;
char *script;
cherokee_connection_t *conn = HANDLER_CONN(cgi);
cherokee_handler_cgi_base_t *cgi_base = HDL_CGI_BASE(cgi);
char *absolute_path = cgi_base->executable.buf;
char *argv[2] = { NULL, NULL };

#ifdef TRACE_ENABLED
TRACE(ENTRIES, "About to execute: '%s'\n", absolute_path);

if (! cherokee_buffer_is_empty (&conn->effective_directory))
TRACE(ENTRIES, "Effective directory: '%s'\n", conn->effective_directory.buf);
else
TRACE(ENTRIES, "No Effective directory %s", "\n");
#endif

/* Close useless sides
*/
cherokee_fd_close (pipe_cgi[0]);
cherokee_fd_close (pipe_server[1]);

/* Change stdin and out
*/
cherokee_fd_close (STDIN_FILENO);
re = dup2 (pipe_server[0], STDIN_FILENO);
cherokee_fd_close (pipe_server[0]);

if (unlikely (re != 0)) {
printf ("Status: 500" CRLF_CRLF);
printf ("X-Debug: file=%s line=%d" CRLF_CRLF, __FILE__, __LINE__);
exit(1);
}

cherokee_fd_close (STDOUT_FILENO);
re |= dup2 (pipe_cgi[1], STDOUT_FILENO);
cherokee_fd_close (pipe_cgi[1]);

/* Redirect the stderr
*/
if ((CONN_VSRV(conn)->error_writer != NULL) &&
(CONN_VSRV(conn)->error_writer->fd != -1))
{
cherokee_fd_close (STDERR_FILENO);
dup2 (CONN_VSRV(conn)->error_writer->fd, STDERR_FILENO);
}

# if 0
/* Set unbuffered
*/
setvbuf (stdin, NULL, _IONBF, 0);
setvbuf (stdout, NULL, _IONBF, 0);
# endif

/* Enable blocking mode
*/
_fd_set_properties (STDIN_FILENO, 0, O_NONBLOCK);
_fd_set_properties (STDOUT_FILENO, 0, O_NONBLOCK);
_fd_set_properties (STDERR_FILENO, 0, O_NONBLOCK);

/* Sets the new environ.
*/
add_environment (cgi, conn);

/* Change the directory
*/
if (! cherokee_buffer_is_empty (&conn->effective_directory)) {
re = chdir (conn->effective_directory.buf);
} else {
char *file = strrchr (absolute_path, '/');

if (file != NULL) {
*file = '\0';
re = chdir (absolute_path);
*file = '/';
} else {
re = -1;
}
}

if (re < 0) {
printf ("Status: 500" CRLF_CRLF);
printf ("X-Debug: file=%s line=%d" CRLF_CRLF, __FILE__, __LINE__);
exit(1);
}

/* Build de argv array
*/
script = absolute_path;
argv[0] = absolute_path;

/* Change the execution user?
*/
if (HANDLER_CGI_PROPS(cgi_base)->change_user) {
struct stat info;

re = cherokee_stat (script, &info);
if (re >= 0) {
re = setuid (info.st_uid);
if (re != 0) {
LOG_ERROR (CHEROKEE_ERROR_HANDLER_CGI_SETID, script, info.st_uid);
}
}
}

/* Reset the server-wide signal handlers
*/
cherokee_reset_signals();

/* Lets go.. execute it!
*/
do {
re = execve (absolute_path, argv, cgi->envp);
} while ((re == -1) && (errno == EINTR));

if (re < 0) {
int err = errno;
char buferr[ERROR_MAX_BUFSIZE];

switch (err) {
case ENODEV:
case ENOTDIR:
case ENOENT:
printf ("Status: 404" CRLF_CRLF);
exit(0);
case EPERM:
case EACCES:
case ENOEXEC:
printf ("Status: 403" CRLF_CRLF);
exit(0);
default:
printf ("Status: 500" CRLF_CRLF);
printf ("X-Debug: file=%s line=%d cmd=%s errno=%d: %s" CRLF_CRLF,
__FILE__, __LINE__, absolute_path, err, strerror(err));
}

/* Don't use the logging system (concurrency issues)
*/
LOG_ERROR (CHEROKEE_ERROR_HANDLER_CGI_EXECUTE,
absolute_path, cherokee_strerror_r(err, buferr, sizeof(buferr)));
exit(1);
}

/* There is no way, it could reach this point.
*/
SHOULDNT_HAPPEN;
exit(2);
}

static ret_t
fork_and_execute_cgi_unix (cherokee_handler_cgi_t *cgi)
{
int re;
int pid;
cherokee_connection_t *conn = HANDLER_CONN(cgi);

struct {
int cgi[2];
int server[2];
} pipes;

/* Creates the pipes ...
*/
re = cherokee_pipe (pipes.cgi);
re |= cherokee_pipe (pipes.server);

if (re != 0) {
conn->error_code = http_internal_error;
return ret_error;
}

/* .. and fork the process
*/
pid = fork();
if (pid == 0) {
/* CGI process
*/
manage_child_cgi_process (cgi, pipes.cgi, pipes.server);

} else if (pid < 0) {
/* Error
*/
cherokee_fd_close (pipes.cgi[0]);
cherokee_fd_close (pipes.cgi[1]);

cherokee_fd_close (pipes.server[0]);
cherokee_fd_close (pipes.server[1]);

conn->error_code = http_internal_error;
return ret_error;
}

TRACE (ENTRIES, "pid %d\n", pid);

cherokee_fd_close (pipes.server[0]);
cherokee_fd_close (pipes.cgi[1]);

cgi->pid = pid;
cgi->pipeInput = pipes.cgi[0];
cgi->pipeOutput = pipes.server[1];

/* Set to Input to NON-BLOCKING
*/
_fd_set_properties (cgi->pipeInput, O_NDELAY|O_NONBLOCK, 0);

return ret_ok;
}



#else



/*******************************
* WINDOWS *
*******************************/

static ret_t
fork_and_execute_cgi_win32 (cherokee_handler_cgi_t *cgi)
{
int re;
PROCESS_INFORMATION pi;
STARTUPINFO si;
char *cmd;
cherokee_buffer_t cmd_line = CHEROKEE_BUF_INIT;
cherokee_buffer_t exec_dir = CHEROKEE_BUF_INIT;
cherokee_connection_t *conn = HANDLER_CONN(cgi);

SECURITY_ATTRIBUTES saSecAtr;
HANDLE hProc;
HANDLE hChildStdinRd = INVALID_HANDLE_VALUE;
HANDLE hChildStdinWr = INVALID_HANDLE_VALUE;
HANDLE hChildStdoutRd = INVALID_HANDLE_VALUE;
HANDLE hChildStdoutWr = INVALID_HANDLE_VALUE;

/* Create the environment for the process
*/
add_environment (cgi, conn);
cherokee_buffer_add (&cgi->envp, "\0", 1);

/* Command line
*/
cmd = HDL_CGI_BASE(cgi)->executable.buf;
cherokee_buffer_add (&cmd_line, cmd, strlen(cmd));
// cherokee_buffer_add_va (&cmd_line, " \"%s\"", HDL_CGI_BASE(cgi)->param.buf);

/* Execution directory
*/
if (! cherokee_buffer_is_empty (&conn->effective_directory)) {
cherokee_buffer_add_buffer (&exec_dir, &conn->effective_directory);
} else {
char *file = strrchr (cmd, '/');
char *end = HDL_CGI_BASE(cgi)->executable.buf + HDL_CGI_BASE(cgi)->executable.len;

cherokee_buffer_add (&exec_dir, cmd,
HDL_CGI_BASE(cgi)->executable.len - (end - file));
}

/* Set the bInheritHandle flag so pipe handles are inherited.
*/
memset(&saSecAtr, 0, sizeof(SECURITY_ATTRIBUTES));
saSecAtr.nLength = sizeof(SECURITY_ATTRIBUTES);
saSecAtr.lpSecurityDescriptor = NULL;
saSecAtr.bInheritHandle = TRUE;

/* Create the pipes
*/
hProc = GetCurrentProcess();

re = CreatePipe (&hChildStdoutRd, &hChildStdoutWr, &saSecAtr, 0);
if (!re) return ret_error;

re = CreatePipe (&hChildStdinRd, &hChildStdinWr, &saSecAtr, 0);
if (!re) return ret_error;

/* Make them inheritable
*/
re = DuplicateHandle (hProc, hChildStdoutRd,
hProc, &hChildStdoutRd,
0, TRUE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
if (!re) return ret_error;

re = DuplicateHandle (hProc, hChildStdinWr,
hProc, &hChildStdinWr,
0, TRUE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
if (!re) return ret_error;


/* Starting information
*/
ZeroMemory (&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.hStdOutput = hChildStdoutWr;
si.hStdError = hChildStdoutWr;
si.hStdInput = hChildStdinRd;
si.dwFlags |= STARTF_USESTDHANDLES;

TRACE (ENTRIES, "exec %s dir %s\n", cmd_line.buf, exec_dir.buf);

/* Launch the child process
*/
re = CreateProcess (cmd, /* ApplicationName */
cmd_line.buf, /* Command line */
NULL, /* Process handle not inheritable */
NULL, /* Thread handle not inheritable */
TRUE, /* Handle inheritance */
0, /* Creation flags */
cgi->envp.buf, /* Use parent's environment block */
exec_dir.buf, /* Use parent's starting directory */
&si, /* Pointer to STARTUPINFO structure */
&pi); /* Pointer to PROCESS_INFORMATION structure */

CloseHandle (hChildStdinRd);
CloseHandle (hChildStdoutWr);

if (!re) {
LOG_ERROR (CHEROKEE_ERROR_HANDLER_CGI_CREATEPROCESS, GetLastError());

CloseHandle (pi.hProcess);
CloseHandle (pi.hThread);

conn->error_code = http_internal_error;
return ret_error;
}

cherokee_buffer_mrproper (&cmd_line);
cherokee_buffer_mrproper (&exec_dir);

cgi->thread = pi.hThread;
cgi->process = pi.hProcess;

/* Wait for the CGI process to be ready
*/
WaitForInputIdle (pi.hProcess, INFINITE);

/* Extract the file descriptors
*/
cgi->pipeInput = _open_osfhandle((LONG)hChildStdoutRd, O_BINARY|_O_RDONLY);

if (! conn->post.len <= 0) {
CloseHandle (hChildStdinWr);
} else {
cgi->pipeOutput = _open_osfhandle((LONG)hChildStdinWr, O_BINARY|_O_WRONLY);
}

TRACE (ENTRIES, "In fd %d, Out fd %d\n", cgi->pipeInput, cgi->pipeOutput);

return ret_ok;
}

#endif
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