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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
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Notwithstanding any other provision of this License, if you modify the
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The Free Software Foundation may publish revised and/or new versions of
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If the disclaimer of warranty and limitation of liability provided
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
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state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
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This program is free software: you can redistribute it and/or modify
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This program is distributed in the hope that it will be useful,
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You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
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solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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Makefile Normal file
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all:
+make -C src
.PHONY: clean
clean:
make -C src clean

4
README.txt Normal file
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make
PY_ENTRYPOINT='foo' spawn-fcgi -d . -n src/pyfcgi -p 9000 -a 127.0.0.1
TODO: write a readme

12
foo.py Executable file
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@ -0,0 +1,12 @@
import sys
import os
import time
def entrypoint():
sys.stderr.write('Called ! req by %s' % os.getenv('REQUEST_METHOD'))
sys.stderr.flush()
env = "foo"
env = ', '.join(os.environ.keys())
msg = "Content-Type: text/html\r\n\r\nHello world !(%0.2f)\nenv : %s" % (time.time(), env)
sys.stdout.write(msg)
sys.stdout.flush()

45
includes_python3.7m.patch Normal file
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@ -0,0 +1,45 @@
diff -rupN python3.7m/bytesobject.h python3.7m_patched/bytesobject.h
--- python3.7m/bytesobject.h 2019-06-30 07:43:17.201934475 +0200
+++ python3.7m_patched/bytesobject.h 2019-06-29 20:16:35.360347551 +0200
@@ -52,9 +52,9 @@ PyAPI_FUNC(PyObject *) PyBytes_FromStrin
PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);
PyAPI_FUNC(PyObject *) PyBytes_FromObject(PyObject *);
PyAPI_FUNC(PyObject *) PyBytes_FromFormatV(const char*, va_list)
- Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 1, 0)));
PyAPI_FUNC(PyObject *) PyBytes_FromFormat(const char*, ...)
- Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
PyAPI_FUNC(Py_ssize_t) PyBytes_Size(PyObject *);
PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
PyAPI_FUNC(PyObject *) PyBytes_Repr(PyObject *, int);
diff -rupN python3.7m/pyerrors.h python3.7m_patched/pyerrors.h
--- python3.7m/pyerrors.h 2019-06-30 07:43:17.201934475 +0200
+++ python3.7m_patched/pyerrors.h 2019-06-29 20:16:35.360347551 +0200
@@ -494,9 +494,9 @@ PyAPI_FUNC(int) PyUnicodeTranslateError_
#include <stdarg.h>
PyAPI_FUNC(int) PyOS_snprintf(char *str, size_t size, const char *format, ...)
- Py_GCC_ATTRIBUTE((format(printf, 3, 4)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 3, 4)));
PyAPI_FUNC(int) PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
- Py_GCC_ATTRIBUTE((format(printf, 3, 0)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 3, 0)));
#ifdef __cplusplus
}
diff -rupN python3.7m/sysmodule.h python3.7m_patched/sysmodule.h
--- python3.7m/sysmodule.h 2019-06-30 07:43:17.205934339 +0200
+++ python3.7m_patched/sysmodule.h 2019-06-29 20:16:35.360347551 +0200
@@ -19,9 +19,9 @@ PyAPI_FUNC(void) PySys_SetArgvEx(int, wc
PyAPI_FUNC(void) PySys_SetPath(const wchar_t *);
PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)
- Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
PyAPI_FUNC(void) PySys_WriteStderr(const char *format, ...)
- Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
+ Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
PyAPI_FUNC(void) PySys_FormatStdout(const char *format, ...);
PyAPI_FUNC(void) PySys_FormatStderr(const char *format, ...);

21
src/Makefile Normal file
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@ -0,0 +1,21 @@
CC=gcc
CFLAGS=-c -Wall `python3-config --includes`
#CFLAGS=-c -Wall -Werror `python3-config --includes`
LDFLAGS=`python3-config --libs` -lfcgi
#LDFLAGS= -L`python3-config --configdir` `python3-config --libs` -lfcgi
SRCS=$(wildcard *.c)
OBJS=$(SRCS:.c=.o)
all: pyfcgi
pyfcgi: $(OBJS)
$(CC) $(LDFLAGS) -o $@ $^
%.o: %.c
$(CC) $(CFLAGS) -o $@ $<
.PHONY: clean
clean:
@rm -v $(OBJS)

19
src/config.h Normal file
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@ -0,0 +1,19 @@
/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE

96
src/main.c Normal file
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@ -0,0 +1,96 @@
/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#include <fcgi_stdio.h> /* fcgi library; put it first*/
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "responder.h"
#define IDENT_FMT "pyfcgi[%d]"
#define MAX_REQS 5
#define EARLY_ERR(err_str) write(2, err_str, strlen(err_str))
int main(int argc, char **argv)
{
char *ident, *py_entrypoint;
size_t ident_len;
pid_t child;
int child_ret;
unsigned int emerg_sleep = 3;
py_entrypoint = getenv("PY_ENTRYPOINT");
if(argc > 1 || !py_entrypoint)
{
EARLY_ERR("Usage : PY_ENTRYPOINT='PATH.py' spawn-fcgi [OPTIONS] ");
EARLY_ERR(argv[0]);
EARLY_ERR("\n");
return 1;
}
ident_len = snprintf(NULL, 0, IDENT_FMT, getpid());
ident_len++;
ident = malloc(sizeof(char)*ident_len);
if(ident == NULL)
{
EARLY_ERR("Unable to allocate memory for ident string...\n");
return -1;
}
snprintf(ident, ident_len, IDENT_FMT, getpid());
openlog(ident, LOG_CONS | LOG_PERROR, LOG_DAEMON | LOG_USER);
syslog(LOG_INFO, "New server started");
while(1)
{
child = fork();
if(child == -1)
{
// TODO : Error
syslog(LOG_EMERG, "Failed to fork : '%s' sleeping %ds", strerror(errno), emerg_sleep);
sleep(emerg_sleep);
continue;
}
else if(!child)
{
responder_loop(py_entrypoint, MAX_REQS, 1, 1);
exit(-1);
}
waitpid(child, &child_ret, 0);
if(child_ret)
{
syslog(LOG_ERR, "Responder loop function exits with error code '%d'",
WEXITSTATUS(child_ret));
}
else
{
syslog(LOG_NOTICE, "Restarting main process after %d requests", MAX_REQS);
}
}
closelog();
free(ident);
}

581
src/pyworker.c Normal file
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@ -0,0 +1,581 @@
/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pyworker.h"
static int worker_piper_sigrcv = 0;
pid_t spawn(char* py_entrypoint, int wrk_id, int semid, int max_reqs)
{
pid_t res;
res = fork();
if(res == -1)
{
syslog( LOG_ERR, "Fork fails for worker #%d : %s",
wrk_id, strerror(errno));
return -1;
}
else if(!res)
{
// Child process
exit(work(py_entrypoint, wrk_id, semid, max_reqs));
}
syslog( LOG_INFO,
"Worker #%d spawned with PID %d", wrk_id, res);
return res;
}
int work(char* py_entrypoint, int wrk_id, int semid, int max_reqs)
{
PyObject *entry_fun;
int count, pipe_out[2], pipe_err[2], pipe_ctl[2], err, piper_status;
struct sigaction act;
sigset_t emptyset;
char buf[PIPE_BUF];
// preparing sigaction for piper
if(sigemptyset(&emptyset))
{
err = errno;
syslog( LOG_ALERT, "sigemptyset fails in piper : %s",
strerror(err));
exit(err);
}
act.sa_handler = worker_piper_sighandler;
act.sa_mask = emptyset;
act.sa_flags = 0;
act.sa_restorer = NULL;
syslog( LOG_INFO,
"Worker %d started", wrk_id);
update_python_path(); // add cwd to python path
Py_Initialize(); // "start" python
update_python_fd(pipe_out, pipe_err);
syslog( LOG_INFO,
"Worker[%d] Python started", wrk_id);
// loading module
entry_fun = import_entrypoint(py_entrypoint);
syslog( LOG_INFO,
"Worker[%d] Waiting request with %s.%s()", wrk_id,
py_entrypoint, PYENTRY_FUNNAME);
count = 0;
while ((!count || count != max_reqs) && FCGI_Accept() >= 0)
{
count++;
syslog( LOG_INFO,
"Worker[%d] request %d", wrk_id, count);
worker_piper_sigrcv = 0;
pipe(pipe_ctl); //TODO : check for pipe error
pid_t pid = fork();
if(pid < 0)
{
err = errno;
syslog(LOG_ALERT,
"Worker[%d] req #%d Fork failed for piper : %s",
wrk_id, count, strerror(err));
exit(err);
}
if(!pid)
{
if(sigaction(WPIPER_SIG, &act, NULL))
{
err = errno;
syslog( LOG_ALERT, "Unable to sigaction in piper : %s",
strerror(err));
exit(err);
}
close(pipe_ctl[0]);
close(pipe_ctl[1]);
worker_piper(wrk_id, count, pipe_out[0], pipe_err[0],
pipe_ctl[1]);
//printf("Content-type: text/html\r\n\r\nHello world !\n");
exit(1);
}
//TODO : update environ !!!
//TODO : check if pipe_ctl lock is really needed anymore
close(pipe_ctl[1]);
PyObject_CallObject(entry_fun, NULL);
if(PyErr_Occurred())
{
log_expt(LOG_ERR);
}
else
{
syslog(LOG_DEBUG, "Worker[%d] request %d funcall [OK]",
wrk_id, count);
}
//TODO : flush pystdout & pystderr using python
read(pipe_ctl[0], &buf, 1); // unblock when child ready
syslog(LOG_DEBUG, "PIPER UNLOCK");
kill(pid, WPIPER_SIG);
waitpid(pid, &piper_status, 0);
if(piper_status)
{
syslog(LOG_WARNING,
"Woker[%d] req #%d piper exited with error status %d",
wrk_id, count, piper_status);
}
syslog(LOG_DEBUG, "Worker[%d] request %d END [OK]",
wrk_id, count);
}
exit(count == max_reqs ?0:42);
}
void worker_piper(int wrk_id, int req_id, int pystdout, int pystderr,
int ctl_pipe)
{
struct pollfd fds[2];
int err, poll_ret, ret, cont;
short revents;
char buf[PIPE_BUF];
syslog(LOG_DEBUG, "Worker[%d] req #%d piper", wrk_id, req_id);
fds[0].fd = pystdout;
fds[1].fd = pystderr;
fds[0].events = fds[1].events = POLLIN;
fds[0].revents = fds[1].revents = 0;
cont = 3;
while(cont)
{
poll_ret = poll(fds, 2, 10);
syslog(LOG_DEBUG, "Worler[%d] req #%d poll_ret = %d", wrk_id, req_id, poll_ret);
if(poll_ret < 0)
{
err = errno;
if(err == EINTR)
{
continue;
}
syslog( LOG_WARNING, "Poll error : %s",
strerror(err));
fds[0].revents = fds[1].revents = 0;
continue;
}
if(!poll_ret && worker_piper_sigrcv)
{
cont--;
continue;
}
if(poll_ret && (revents = fds[0].revents))
{
syslog(LOG_DEBUG, "Worker[%d] req #%d STDOUT evt !",
wrk_id, req_id);
poll_ret--;
if(revents & POLLIN)
{
syslog(LOG_DEBUG, "Worker[%d] req #%d POLLIN STDOUT !",
wrk_id, req_id);
while(1)
{
ret = read(pystdout, buf, PIPE_BUF);
syslog(LOG_DEBUG, "Worker[%d] req #%d read(stdout) ret %d",
wrk_id, req_id, ret);
if(ret < 0)
{
err = errno;
if(err == EINTR)
{
continue;
}
syslog( LOG_ERR,
"Error reading python stdout : %s",
strerror(err));
exit(err);
}
buf[ret] = '\0';
printf("%s", buf);
break;
}
}
//TODO handle other poll events
}
if(poll_ret && (revents = fds[1].revents))
{
syslog(LOG_DEBUG, "Worker[%d] req #%d STDERR evt !",
wrk_id, req_id);
if(revents & POLLIN)
{
syslog(LOG_DEBUG, "Worker[%d] req #%d POLLIN STDERR !",
wrk_id, req_id);
while(1)
{
ret = read(pystderr, buf, PIPE_BUF);
if(ret < 0)
{
err = errno;
if(err == EINTR)
{
continue;
}
syslog( LOG_ERR,
"Error reading python stdout : %s",
strerror(err));
exit(err);
}
buf[ret] = '\0';
syslog(LOG_ERR,
"Worker[%d] Python error : %s",
wrk_id, buf);
break;
}
}
//TODO handle other poll events
}
fds[0].revents = fds[1].revents = 0;
}
syslog(LOG_DEBUG, "Worker[%d] req #%d piper exiting...",
wrk_id, req_id);
exit(0);
}
void worker_piper_sighandler(int signum)
{
worker_piper_sigrcv = 1;
syslog(LOG_DEBUG, "SIG");
}
PyObject* import_entrypoint(char* py_entrypoint)
{
PyObject *entry_fname, *entry_module, *entry_fun;
entry_fname = PyUnicode_DecodeFSDefault(py_entrypoint);
entry_module = PyImport_Import(entry_fname);
Py_DECREF(entry_fname);
if(!entry_module)
{
//TODO syslog python error / traceback
syslog( LOG_CRIT,
"Unable to import python file '%s'",
py_entrypoint);
syslog( LOG_INFO,
"%s", getcwd(NULL, 256));
log_expt(LOG_ERR);
sleep(1);
Py_Exit(1);
}
// getting entrypoint function
entry_fun = PyObject_GetAttrString(entry_module, PYENTRY_FUNNAME);
Py_DECREF(entry_module);
if(!entry_fun)
{
//TODO syslog python error / traceback
syslog( LOG_CRIT,
"Unable to import object '%s' from '%s'",
PYENTRY_FUNNAME, py_entrypoint);
Py_Exit(2);
}
if(!PyCallable_Check(entry_fun))
{
syslog( LOG_CRIT,
"When imported from '%s', '%s' was not a callable",
py_entrypoint, PYENTRY_FUNNAME);
Py_Exit(3);
}
return entry_fun;
}
void update_python_path()
{
wchar_t *ppath, *wcwd, *wtmp;
char *cwd, *ncwd, *err_fmt;
size_t wcwd_sz, ppath_sz;
int err;
// Add a ':' in front of CWD and convert to wchar_t*
cwd = get_current_dir_name();
if(!cwd)
{
err = errno;
err_fmt = "Unable to fecth CWD : %s";
goto update_python_path_err;
}
ncwd = malloc(sizeof(char) * (strlen(cwd) + 2));
if(!ncwd)
{
err = errno;
err_fmt = "Unable to allocate memory for new CWD : %s";
goto update_python_path_err_cwd;
}
ncwd[0] = ':';
strcpy(ncwd+1, cwd);
free(cwd);
cwd = ncwd;
wcwd_sz = mbstowcs(NULL, cwd, 0);
if(wcwd_sz == (size_t)-1)
{
err = errno;
err_fmt = "Unable to convert CWD to wchar : %s";
goto update_python_path_err_cwd;
}
wcwd_sz++;
wcwd = malloc(sizeof(wchar_t) * wcwd_sz);
if(!wcwd)
{
err = errno;
err_fmt = "Unable to allocate wchar for CWD : %s";
goto update_python_path_err_cwd;
}
if(mbstowcs(wcwd, cwd, wcwd_sz) == -1)
{
err = errno;
err_fmt = "Unable to convert CWD to wchar : %s";
goto update_python_path_err_wcwd;
}
// Fetch, dup & update the python path
ppath = Py_GetPath();
if(!ppath)
{
if(PyErr_Occurred())
{
log_expt(LOG_ALERT);
}
else
{
syslog(LOG_ALERT, "Unable to fetch python path, got NULL.");
}
err_fmt = NULL;
goto update_python_path_err_wcwd;
}
ppath = wcsdup(ppath);
if(!wcwd)
{
err = errno;
err_fmt = "Unable to dup the python PATH : %s";
goto update_python_path_err_wcwd;
}
ppath_sz = wcslen(ppath);
wtmp = realloc(ppath, sizeof(wchar_t) * (ppath_sz + wcwd_sz + 1));
if(!wtmp)
{
err = errno;
err_fmt = "Unable reallocate new python path : %s";
goto update_python_path_err_ppath;
}
ppath = wtmp;
wcsncpy(ppath+ppath_sz, wcwd, wcwd_sz);
Py_SetPath(ppath);
free(ppath);
free(wcwd);
free(cwd);
return;
update_python_path_err_ppath:
free(ppath);
update_python_path_err_wcwd:
free(wcwd);
update_python_path_err_cwd:
free(cwd);
update_python_path_err:
if(err_fmt)
{
syslog( LOG_ALERT, err_fmt, strerror(err));
}
exit(err);
}
void update_python_fd(int pipe_out[2], int pipe_err[2])
{
int pri, err;
char *err_fmt;
PyObject *os_mod, *pyfdopen, *args, *new_fd;
pri = LOG_ALERT;
if(pipe2(pipe_out, O_DIRECT) == -1)
{
err = errno;
err_fmt = "Unable to create pipe for python stdout : %s";
goto update_python_fd_err;
}
if(pipe2(pipe_err, O_DIRECT) == -1)
{
err = errno;
err_fmt = "Unable to create pipe for python stderr : %s";
goto update_python_fd_err_pipeout;
}
os_mod = PyImport_ImportModule("os");
if(!os_mod)
{
if(PyErr_Occurred())
{
log_expt(LOG_ALERT);
}
else
{
syslog( LOG_ALERT,
"Unable to import python os module, got NULL.");
}
err_fmt = NULL;
goto update_python_fd_err_pipes;
}
pyfdopen = PyObject_GetAttrString(os_mod, "fdopen");
Py_DECREF(os_mod);
if(!pyfdopen)
{
if(PyErr_Occurred())
{
log_expt(LOG_ALERT);
}
else
{
syslog( LOG_ALERT,
"Unable to fetch os.fdopen() , got NULL.");
}
err_fmt = NULL;
Py_DECREF(os_mod);
goto update_python_fd_err_pipes;
}
args = Py_BuildValue("is", pipe_out[1], "w");
if(!args)
{
syslog( LOG_ERR, "Error building values with '%d', '%s' for stdout",
pipe_out[1], "w");
log_expt(LOG_ALERT);
err_fmt = NULL;
goto update_python_fd_err_fdopen;
}
new_fd = PyObject_CallObject(pyfdopen, args);
if(!new_fd || PyErr_Occurred())
{
syslog( LOG_ERR, "Error calling fdopen(%d, '%s')",
pipe_out[1], "w");
log_expt(LOG_ALERT);
err_fmt = NULL;
goto update_python_fd_err_args;
}
Py_DECREF(args);
if(PySys_SetObject("stdout", new_fd))
{
syslog(LOG_ERR, "Unable to set sys.stdout");
log_expt(LOG_ALERT);
goto update_python_fd_err_newfd;
}
Py_DECREF(new_fd);
args = Py_BuildValue("is", pipe_err[1], "w");
if(!args)
{
syslog( LOG_ERR, "Error building values with '%d', '%s' for stderr",
pipe_out[1], "w");
log_expt(LOG_ALERT);
err_fmt = NULL;
goto update_python_fd_err_fdopen;
}
new_fd = PyObject_CallObject(pyfdopen, args);
if(!new_fd || PyErr_Occurred())
{
syslog( LOG_ERR, "Error calling fdopen(%d, '%s')",
pipe_out[1], "w");
log_expt(LOG_ALERT);
err_fmt = NULL;
goto update_python_fd_err_args;
}
Py_DECREF(args);
if(PySys_SetObject("stderr", new_fd))
{
syslog(LOG_ERR, "Unable to set sys.stderr");
log_expt(LOG_ALERT);
goto update_python_fd_err_newfd;
}
Py_DECREF(new_fd);
return;
update_python_fd_err_newfd:
Py_DECREF(new_fd);
update_python_fd_err_args:
Py_DECREF(args);
update_python_fd_err_fdopen:
Py_DECREF(fdopen);
update_python_fd_err_pipes:
close(pipe_err[0]);
close(pipe_err[1]);
update_python_fd_err_pipeout:
close(pipe_out[0]);
close(pipe_out[1]);
update_python_fd_err:
if(err_fmt)
{
syslog(pri, err_fmt, strerror(err));
}
exit(1);
}
void log_expt(int priority)
{
if(!PyErr_Occurred())
{
syslog(priority, "No exception");
return;
}
PyObject *expt, *expt_str, *expt_bytes, *expt_cls,
*expt_val, *expt_type, *traceback;
char *msg, *type, *val;
int msg_sz;
char msg_fmt[] = "%s: %s";
PyErr_Fetch(&expt_cls, &expt, &traceback);
// Fetching exception message using __str__()
expt_str = PyObject_GetAttrString(expt, "__str__");
if(!expt_str)
{
syslog(LOG_ERR, "Unable to fetch __str__ from exception");
}
expt_val = PyObject_CallObject(expt_str, NULL);
expt_bytes = PyUnicode_AsUTF8String(expt_val);
msg = PyBytes_AsString(expt_bytes);
val = strndup(msg, 1024); // TODO check out of mem if !val
// Fetching exception class name
expt_type = PyObject_GetAttrString(expt_cls, "__name__");
expt_bytes = PyUnicode_AsUTF8String(expt_type);
msg = PyBytes_AsString(expt_bytes);
type = strndup(msg, 1024); // TODO check out of mem if !type
msg_sz = snprintf(NULL, 0, msg_fmt, type, val);
msg_sz++;
msg = malloc(sizeof(char) * msg_sz);
snprintf(msg, msg_sz, msg_fmt, type, val);
syslog(priority, msg);
}

97
src/pyworker.h Normal file
View file

@ -0,0 +1,97 @@
/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _PYWORKER__H___
#define _PYWORKER__H___
#include "config.h"
#include <fcgi_stdio.h> /* fcgi library; put it first*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <unistd.h>
#include <fcntl.h>
#include <syslog.h>
#include <signal.h>
#include <limits.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/wait.h>
#define EXIT_PYERR 42
#define WPIPER_SIG 30
#define PYENTRY_FUNNAME "entrypoint"
typedef unsigned long int pywrkid_t;
/**@brief Spawn a worker given an entrypoint
*
* Spawn a new worker process and prepare ENV & request forwarding
* @param char* python_entrypoint a path to a python entrypoint
* @param int worker uid
* @param int semid for FCGI access
* @param int max request before worker restart
* @return child PID
*/
pid_t spawn(char*, int, int, int);
/**@brief the function that initialize the python worker
* @param char* python_entrypoint a path to a python entrypoint
* @param int worker uid
* @param int semid for FCGI access
* @param int max request before worker restart
* @return 0 if exit avec max requests
*/
int work(char*, int, int, int);
/**@brief function for a subprocess designed to read stdin & stdout from
* python & forward them to syslog or FCGI
* @param int worker id
* @param int request id
* @param int pystdout
* @param int pystderr
* @param int ctlpipe a pipe closed when the process is ready
* @note Exit after signal sent by parent & when poll indicate the pipes are
* empty
*/
void worker_piper(int, int, int, int, int);
/**@brief worker piper sigaction handler
*/
void worker_piper_sighandler(int);
/**@brief Import & return the python entrypoint callable
*/
PyObject* import_entrypoint(char* py_entrypoint);
/**@brief Add . to the embed pythonpath
*/
void update_python_path();
/**@brief Create two pipes for stdout & stderr
* @params int[2] pystdout
* @params int[2] pystderr
*/
void update_python_fd(int[2], int[2]);
void log_expt(int priority);
#endif

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/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#include "responder.h"
int pyfcgi_semid = 0;
void init_context()
{
pyfcgi_semid = 0;
}
int responder_loop(char *py_entrypoint, unsigned int max_reqs,
unsigned int min_wrk, unsigned int max_wrk)
{
unsigned int n_wrk;
int *wrk_pids;
int semid, err;
syslog(LOG_INFO, "Preparing workers");
init_context();
wrk_pids = malloc(sizeof(int) * max_wrk);
if(!wrk_pids)
{
err = errno;
syslog( LOG_ALERT,
"Unable to allocate memory for childs PID : %s",
strerror(err));
clean_exit(err);
}
bzero(wrk_pids, sizeof(int) * max_wrk);
semid = new_semaphore();
for(n_wrk=0; n_wrk != min_wrk; n_wrk++)
{
wrk_pids[n_wrk] = spawn(py_entrypoint, n_wrk, semid, max_reqs);
}
//Debug wait & exit
for(n_wrk=0; n_wrk != min_wrk; n_wrk++)
{
wait(NULL);
}
//printf("Content-Type: text/html\r\n\r\nHello world !\n");
return 0;
}
int new_semaphore(key_t semkey)
{
int semid, err;
semid = semget(IPC_PRIVATE, 2, 0770);
if(semid == -1)
{
err = errno;
syslog( LOG_ALERT,
"Unable to create semaphore : %s",
strerror(err));
clean_exit(err);
}
if(pyfcgi_semid)
{
syslog( LOG_WARNING,
"The semid context was not zero when calling new_semaphore, attempt to closeing it.");
semctl(pyfcgi_semid, 0, IPC_RMID);
}
pyfcgi_semid = semid;
return semid;
}
void clean_exit(int status)
{
if(pyfcgi_semid && semctl(pyfcgi_semid, 0, IPC_RMID) == -1)
{
syslog( LOG_CRIT,
"Unable to delete semaphore before exiting.");
}
exit(status);
}

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/*
* Copyright (C) 2019 Weber Yann
*
* This file is part of PyFCGI.
*
* PyFCGI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* PyFCGI 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with PyFCGI. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _RESPONDER__H___
#define _RESPONDER__H___
#include <fcgi_stdio.h> /* fcgi library; put it first*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include "pyworker.h"
extern int pyfcgi_semid;
void init_context();
/**@brief The responder loop
*
* The main function of the fcgi app fork child
* @param int max_requests : exit normally after this number of requests. If
* 0 given never exit.
* @param char* python_entrypoint a path to a python entrypoint
* @param unsigned int max_requests before exiting worker
* @param unsigned int minimum workers count
* @param unsigned int maximum wrokers count
* @return 0 on success
*/
int responder_loop(char *py_entrypoint, unsigned int max_reqs,
unsigned int min_wrk, unsigned int max_wrk);
/**@brief Generate a new semaphore from given key
* @note set pyfcgi_semid
* @return int semid
*/
int new_semaphore();
/**@brief Exit after closing all stuff like semaphores
*/
void clean_exit(int);
#endif