FastCGI application to run cgi applications https://redmine.lighttpd.net/projects/fcgi-cgi
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "fastcgi.h"
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stropts.h>
#include <sys/stat.h>
#define MAX_BUFFER_SIZE (64*1024)
#define CONST_STR_LEN(x) (x), sizeof(x) - 1
#define GSTR_LEN(x) (x) ? (x)->str : "", (x) ? (x)->len : 0
#define UNUSED(x) ((void)(x))
/* #define ERROR(...) g_printerr(G_STRLOC " (" G_STRFUNC "): " __VA_ARGS__) */
#define __STR(x) #x
#define ERROR(...) g_printerr("fcgi-cgi.c:" G_STRINGIFY(__LINE__) ": " __VA_ARGS__)
struct fcgi_cgi_server;
typedef struct fcgi_cgi_server fcgi_cgi_server;
struct fcgi_cgi_child;
typedef struct fcgi_cgi_child fcgi_cgi_child;
struct fcgi_cgi_server {
struct ev_loop *loop;
fastcgi_server *fsrv;
GPtrArray *aborted_pending_childs;
ev_signal
sig_w_INT,
sig_w_TERM,
sig_w_HUP;
};
struct fcgi_cgi_child {
fcgi_cgi_server *srv;
fastcgi_connection *fcon;
gint aborted_id;
pid_t pid;
gint child_status;
ev_child child_watcher;
gint pipe_in, pipe_out, pipe_err;
ev_io pipe_in_watcher, pipe_out_watcher, pipe_err_watcher;
/* write queue */
fastcgi_queue write_queue;
};
static fcgi_cgi_child* fcgi_cgi_child_create(fcgi_cgi_server *srv, fastcgi_connection *fcon);
static void fcgi_cgi_child_check_done(fcgi_cgi_child *cld);
static void fcgi_cgi_child_close_write(fcgi_cgi_child *cld);
static void fcgi_cgi_child_close_read(fcgi_cgi_child *cld);
static void fcgi_cgi_child_close_error(fcgi_cgi_child *cld);
static void fcgi_cgi_child_free(fcgi_cgi_child *cld);
static void fcgi_cgi_child_error(fcgi_cgi_child *cld);
static void fcgi_cgi_child_start(fcgi_cgi_child *cld, const gchar *path);
static void fcgi_cgi_wrote_data(fastcgi_connection *fcon);
/* move a fd to another and close the old one */
static void move2fd(int srcfd, int dstfd) {
if (srcfd != dstfd) {
close(dstfd);
dup2(srcfd, dstfd);
close(srcfd);
}
}
static void fd_init(int fd) {
#ifdef _WIN32
int i = 1;
#endif
#ifdef FD_CLOEXEC
/* close fd on exec (cgi) */
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
#ifdef O_NONBLOCK
fcntl(fd, F_SETFL, O_NONBLOCK | O_RDWR);
#elif defined _WIN32
ioctlsocket(fd, FIONBIO, &i);
#endif
}
static void fcgi_cgi_child_child_cb(struct ev_loop *loop, ev_child *w, int revents) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) w->data;
UNUSED(revents);
ev_child_stop(loop, w);
fcgi_cgi_child_close_write(cld);
cld->pid = -1;
cld->child_status = w->rstatus;
fcgi_cgi_child_check_done(cld);
}
static void write_queue(fcgi_cgi_child *cld) {
if (-1 == cld->pipe_out) return;
if (fastcgi_queue_write(cld->pipe_out, &cld->write_queue, 256*1024) < 0) {
fcgi_cgi_child_close_write(cld);
return;
}
if (-1 != cld->pipe_out) {
if (cld->write_queue.length > 0) {
ev_io_start(cld->srv->loop, &cld->pipe_out_watcher);
if (cld->write_queue.length > MAX_BUFFER_SIZE) {
fastcgi_suspend_read(cld->fcon);
} else {
fastcgi_resume_read(cld->fcon);
}
} else {
if (cld->write_queue.closed) {
fcgi_cgi_child_close_write(cld);
} else {
ev_io_stop(cld->srv->loop, &cld->pipe_out_watcher);
fastcgi_resume_read(cld->fcon);
}
}
}
}
static GString* read_chunk(gint fd, guint maxlen) {
gssize res;
GString *str;
int tmp_errno;
str = g_string_sized_new(maxlen);
g_string_set_size(str, maxlen);
res = read(fd, str->str, maxlen);
if (res == -1) {
tmp_errno = errno;
g_string_free(str, TRUE);
errno = tmp_errno;
return NULL;
} else if (res == 0) {
g_string_free(str, TRUE);
errno = ECONNRESET;
return NULL;
} else {
g_string_set_size(str, res);
return str;
}
}
static void fcgi_cgi_child_pipe_in_cb(struct ev_loop *loop, ev_io *w, int revents) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) w->data;
GString *buf;
UNUSED(loop); UNUSED(revents);
if (NULL == (buf = read_chunk(cld->pipe_in, 64*1024))) {
switch (errno) {
case EINTR:
case EAGAIN:
#if EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
return; /* try again later */
case ECONNRESET:
fcgi_cgi_child_close_read(cld);
break;
default:
ERROR("read from fd=%d failed, %s\n", cld->pipe_in, g_strerror(errno));
fcgi_cgi_child_close_read(cld);
break;
}
} else if (cld->fcon) {
fastcgi_send_out(cld->fcon, buf);
fcgi_cgi_wrote_data(cld->fcon);
} else {
g_string_free(buf, TRUE);
}
}
static void fcgi_cgi_child_pipe_out_cb(struct ev_loop *loop, ev_io *w, int revents) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) w->data;
UNUSED(loop); UNUSED(revents);
write_queue(cld);
}
static void fcgi_cgi_child_pipe_err_cb(struct ev_loop *loop, ev_io *w, int revents) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) w->data;
GString *buf;
UNUSED(loop); UNUSED(revents);
if (NULL == (buf = read_chunk(cld->pipe_err, 64*1024))) {
switch (errno) {
case EINTR:
case EAGAIN:
#if EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
return; /* try again later */
case ECONNRESET:
fcgi_cgi_child_close_error(cld);
break;
default:
ERROR("read from fd=%d failed, %s\n", cld->pipe_err, g_strerror(errno));
fcgi_cgi_child_close_error(cld);
break;
}
} else if (cld->fcon) {
fastcgi_send_err(cld->fcon, buf);
fcgi_cgi_wrote_data(cld->fcon);
} else {
g_string_free(buf, TRUE);
}
}
static fcgi_cgi_child* fcgi_cgi_child_create(fcgi_cgi_server *srv, fastcgi_connection *fcon) {
fcgi_cgi_child *cld = g_slice_new0(fcgi_cgi_child);
cld->srv = srv;
cld->fcon = fcon;
cld->aborted_id = -1;
cld->pid = -1;
ev_child_init(&cld->child_watcher, fcgi_cgi_child_child_cb, -1, 0);
cld->child_watcher.data = cld;
cld->pipe_in = cld->pipe_out = -1;
ev_io_init(&cld->pipe_in_watcher, fcgi_cgi_child_pipe_in_cb, -1, 0);
cld->pipe_in_watcher.data = cld;
ev_io_init(&cld->pipe_out_watcher, fcgi_cgi_child_pipe_out_cb, -1, 0);
cld->pipe_out_watcher.data = cld;
ev_io_init(&cld->pipe_err_watcher, fcgi_cgi_child_pipe_err_cb, -1, 0);
cld->pipe_err_watcher.data = cld;
return cld;
}
static void fcgi_cgi_child_check_done(fcgi_cgi_child *cld) {
if (!cld->fcon) {
if (-1 != cld->aborted_id && (cld->pid == -1 || (cld->pipe_out == -1 && cld->pipe_in == -1))) {
fcgi_cgi_child *t_cld;
GPtrArray *a = cld->srv->aborted_pending_childs;
guint i = a->len - 1;
t_cld = g_ptr_array_index(a, cld->aborted_id) = g_ptr_array_index(a, i);
g_ptr_array_set_size(a, i);
t_cld->aborted_id = cld->aborted_id;
cld->aborted_id = -1;
fcgi_cgi_child_free(cld);
}
} else {
if (cld->pid == -1 && cld->pipe_out == -1 && cld->pipe_in == -1 && cld->pipe_err == -1) {
fastcgi_end_request(cld->fcon, cld->child_status, FCGI_REQUEST_COMPLETE);
}
}
}
static void fcgi_cgi_child_close_write(fcgi_cgi_child *cld) {
if (cld->pipe_out != -1) {
ev_io_stop(cld->srv->loop, &cld->pipe_out_watcher);
close(cld->pipe_out);
cld->pipe_out = -1;
fastcgi_queue_clear(&cld->write_queue);
cld->write_queue.closed = TRUE;
fcgi_cgi_child_check_done(cld);
}
}
static void fcgi_cgi_child_close_read(fcgi_cgi_child *cld) {
if (cld->pipe_in != -1) {
ev_io_stop(cld->srv->loop, &cld->pipe_in_watcher);
close(cld->pipe_in);
cld->pipe_in = -1;
if (cld->fcon) fastcgi_send_out(cld->fcon, NULL);
fcgi_cgi_child_check_done(cld);
}
}
static void fcgi_cgi_child_close_error(fcgi_cgi_child *cld) {
if (cld->pipe_err != -1) {
ev_io_stop(cld->srv->loop, &cld->pipe_err_watcher);
close(cld->pipe_err);
cld->pipe_err = -1;
if (cld->fcon) fastcgi_send_err(cld->fcon, NULL);
fcgi_cgi_child_check_done(cld);
}
}
static void fcgi_cgi_child_free(fcgi_cgi_child *cld) {
if (cld->fcon) cld->fcon->data = NULL;
cld->fcon = NULL;
fcgi_cgi_child_close_write(cld);
fcgi_cgi_child_close_read(cld);
fcgi_cgi_child_close_error(cld);
ev_child_stop(cld->srv->loop, &cld->child_watcher);
g_slice_free(fcgi_cgi_child, cld);
}
static void fcgi_cgi_child_error(fcgi_cgi_child *cld) {
if (cld->fcon) {
fastcgi_connection_close(cld->fcon);
}
}
static void fcgi_cgi_child_start(fcgi_cgi_child *cld, const gchar *path) {
int pipes_to[2] = {-1, -1}, pipes_from[2] = {-1, -1}, pipes_err[2] = {-1, -1};
pid_t pid;
if (-1 == pipe(pipes_to)) {
ERROR("couldn't create pipe: %s\n", g_strerror(errno));
goto error;
}
if (-1 == pipe(pipes_from)) {
ERROR("couldn't create pipe: %s\n", g_strerror(errno));
goto error;
}
if (-1 == pipe(pipes_err)) {
ERROR("couldn't create pipe: %s\n", g_strerror(errno));
goto error;
}
pid = fork();
switch (pid) {
case 0: {
GPtrArray *enva = cld->fcon->environ;
char **newenv;
char *const args[] = { (char *) path, NULL };
close(pipes_to[1]); close(pipes_from[0]); close(pipes_err[0]);
move2fd(pipes_to[0], 0);
move2fd(pipes_from[1], 1);
move2fd(pipes_err[1], 2);
g_ptr_array_add(enva, NULL);
newenv = (char**) g_ptr_array_free(enva, FALSE);
execve(path, args, newenv);
ERROR("couldn't execve '%s': %s\n", path, g_strerror(errno));
exit(-1);
}
break;
case -1:
ERROR("couldn't fork: %s\n", g_strerror(errno));
goto error;
default:
cld->pid = pid;
ev_child_set(&cld->child_watcher, cld->pid, 0);
ev_child_start(cld->srv->loop, &cld->child_watcher);
close(pipes_to[0]); close(pipes_from[1]); close(pipes_err[1]);
fd_init(pipes_to[1]); fd_init(pipes_from[0]); fd_init(pipes_err[0]);
cld->pipe_out = pipes_to[1];
cld->pipe_in = pipes_from[0];
cld->pipe_err = pipes_err[0];
ev_io_set(&cld->pipe_out_watcher, cld->pipe_out, EV_WRITE);
ev_io_set(&cld->pipe_in_watcher, cld->pipe_in, EV_READ);
ev_io_set(&cld->pipe_err_watcher, cld->pipe_err, EV_READ);
if (cld->write_queue.length > 0) ev_io_start(cld->srv->loop, &cld->pipe_out_watcher);
ev_io_start(cld->srv->loop, &cld->pipe_in_watcher);
ev_io_start(cld->srv->loop, &cld->pipe_err_watcher);
break;
}
return;
error:
close(pipes_to[0]); close(pipes_to[1]);
close(pipes_from[0]); close(pipes_from[1]);
close(pipes_err[0]); close(pipes_err[1]);
fcgi_cgi_child_error(cld);
}
static void fcgi_cgi_direct_result(fastcgi_connection *fcon, int status) {
GString *s = g_string_new(0);
g_string_append_printf(s, "Status: %i\r\n\r\n", status);
fastcgi_send_out(fcon, s);
fastcgi_send_out(fcon, NULL);
fastcgi_send_err(fcon, NULL);
fastcgi_end_request(fcon, 0, FCGI_REQUEST_COMPLETE);
}
static void fcgi_cgi_new_request(fastcgi_connection *fcon) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) fcon->data;
const gchar *binpath;
struct stat st;
if (cld) return;
binpath = fastcgi_connection_environ_lookup(fcon, CONST_STR_LEN("INTERPRETER"));
if (!binpath) binpath = fastcgi_connection_environ_lookup(fcon, CONST_STR_LEN("SCRIPT_FILENAME"));
if (!binpath) {
fcgi_cgi_direct_result(fcon, 500);
return;
}
if (-1 == stat(binpath, &st)) {
switch (errno) {
case EACCES:
case ENOTDIR:
fcgi_cgi_direct_result(fcon, 403);
break;
case ENOENT:
fcgi_cgi_direct_result(fcon, 404);
break;
default:
fcgi_cgi_direct_result(fcon, 500);
break;
}
return;
}
if (!S_ISREG(st.st_mode) || !((S_IXUSR | S_IXGRP | S_IXOTH) && st.st_mode)) {
fcgi_cgi_direct_result(fcon, 403);
return;
}
cld = fcgi_cgi_child_create(fcon->fsrv->data, fcon);
fcon->data = cld;
fcgi_cgi_child_start(cld, binpath);
}
static void fcgi_cgi_wrote_data(fastcgi_connection *fcon) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) fcon->data;
if (!cld) return;
if (cld->fcon->write_queue.length < MAX_BUFFER_SIZE) {
if (-1 != cld->pipe_in) ev_io_start(cld->srv->loop, &cld->pipe_in_watcher);
if (-1 != cld->pipe_err) ev_io_start(cld->srv->loop, &cld->pipe_err_watcher);
} else {
if (-1 != cld->pipe_in) ev_io_stop(cld->srv->loop, &cld->pipe_in_watcher);
if (-1 != cld->pipe_err) ev_io_stop(cld->srv->loop, &cld->pipe_err_watcher);
}
}
static void fcgi_cgi_received_stdin(fastcgi_connection *fcon, GString *data) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) fcon->data;
/* if proc is running but pipe closed -> drop data */
if (!cld || cld->write_queue.closed) {
if (data) g_string_free(data, TRUE);
return;
}
fastcgi_queue_append_string(&cld->write_queue, data);
write_queue(cld); /* if we don't call this we have to check the write-queue length */
}
static void fcgi_cgi_request_aborted(fastcgi_connection *fcon) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) fcon->data;
if (!cld) return;
fcgi_cgi_child_close_write(cld);
}
static void fcgi_cgi_reset_connection(fastcgi_connection *fcon) {
fcgi_cgi_child *cld = (fcgi_cgi_child*) fcon->data;
if (!cld) return;
fcon->data = NULL;
cld->fcon = NULL;
if (cld->pid == -1 || (cld->pipe_out == -1 && cld->pipe_in == -1)) {
fcgi_cgi_child_free(cld);
} else {
fcgi_cgi_child_close_write(cld);
cld->aborted_id = cld->srv->aborted_pending_childs->len;
g_ptr_array_add(cld->srv->aborted_pending_childs, cld);
}
}
static const fastcgi_callbacks cgi_callbacks = {
/* cb_new_connection: */ NULL,
/* cb_new_request: */ fcgi_cgi_new_request,
/* cb_wrote_data: */ fcgi_cgi_wrote_data,
/* cb_received_stdin: */ fcgi_cgi_received_stdin,
/* cb_received_data: */ NULL,
/* cb_request_aborted: */ fcgi_cgi_request_aborted,
/* cb_reset_connection: */ fcgi_cgi_reset_connection
};
static fcgi_cgi_server* fcgi_cgi_server_create(struct ev_loop *loop, int fd) {
fcgi_cgi_server* srv = g_slice_new0(fcgi_cgi_server);
srv->loop = loop;
srv->aborted_pending_childs = g_ptr_array_new();
srv->fsrv = fastcgi_server_create(loop, fd, &cgi_callbacks, 10);
srv->fsrv->data = srv;
return srv;
}
static void fcgi_cgi_server_free(fcgi_cgi_server* srv) {
guint i;
for (i = 0; i < srv->aborted_pending_childs->len; i++) {
fcgi_cgi_child_free(g_ptr_array_index(srv->aborted_pending_childs, i));
}
g_ptr_array_free(srv->aborted_pending_childs, TRUE);
fastcgi_server_free(srv->fsrv);
g_slice_free(fcgi_cgi_server, srv);
}
#define CATCH_SIGNAL(loop, cb, n) do {\
ev_init(&srv->sig_w_##n, cb); \
ev_signal_set(&srv->sig_w_##n, SIG##n); \
ev_signal_start(loop, &srv->sig_w_##n); \
srv->sig_w_##n.data = srv; \
ev_unref(loop); /* Signal watchers shouldn't keep loop alive */ \
} while (0)
#define UNCATCH_SIGNAL(loop, n) do {\
ev_ref(loop); \
ev_signal_stop(loop, &srv->sig_w_##n); \
} while (0)
static void sigint_cb(struct ev_loop *loop, struct ev_signal *w, int revents) {
fcgi_cgi_server *srv = (fcgi_cgi_server*) w->data;
UNUSED(revents);
if (!srv->fsrv->do_shutdown) {
ERROR("Got signal, shutdown\n");
fastcgi_server_stop(srv->fsrv);
} else {
ERROR("Got second signal, force shutdown\n");
ev_unloop(loop, EVUNLOOP_ALL);
}
}
int main(int argc, char **argv) {
struct ev_loop *loop;
fcgi_cgi_server* srv;
loop = ev_default_loop(0);
srv = fcgi_cgi_server_create(loop, 0);
signal(SIGPIPE, SIG_IGN);
CATCH_SIGNAL(loop, sigint_cb, INT);
CATCH_SIGNAL(loop, sigint_cb, TERM);
CATCH_SIGNAL(loop, sigint_cb, HUP);
ev_loop(loop, 0);
fcgi_cgi_server_free(srv);
return 0;
}