elemental-ircd/libratbox/src/helper.c

287 lines
6.9 KiB
C

/*
* ircd-ratbox: A slightly useful ircd
* helper.c: Starts and deals with ircd helpers
*
* Copyright (C) 2006 Aaron Sethman <androsyn@ratbox.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <libratbox_config.h>
#include <ratbox_lib.h>
#include <commio-int.h>
struct _rb_helper {
char *path;
buf_head_t sendq;
buf_head_t recvq;
rb_fde_t *ifd;
rb_fde_t *ofd;
pid_t pid;
int fork_count;
rb_helper_cb *read_cb;
rb_helper_cb *error_cb;
};
/* setup all the stuff a new child needs */
rb_helper *
rb_helper_child(rb_helper_cb * read_cb, rb_helper_cb * error_cb, log_cb * ilog,
restart_cb * irestart, die_cb * idie, int maxcon, size_t lb_heap_size,
size_t dh_size, size_t fd_heap_size)
{
rb_helper *helper;
int maxfd, x = 0;
int ifd, ofd;
char *tifd, *tofd, *tmaxfd;
tifd = getenv("IFD");
tofd = getenv("OFD");
tmaxfd = getenv("MAXFD");
if(tifd == NULL || tofd == NULL || tmaxfd == NULL)
return NULL;
helper = rb_malloc(sizeof(rb_helper));
ifd = (int)strtol(tifd, NULL, 10);
ofd = (int)strtol(tofd, NULL, 10);
maxfd = (int)strtol(tmaxfd, NULL, 10);
#ifndef _WIN32
for(x = 0; x < maxfd; x++) {
if(x != ifd && x != ofd)
close(x);
}
x = open("/dev/null", O_RDWR);
if(ifd != 0 && ofd != 0)
dup2(x, 0);
if(ifd != 1 && ofd != 1)
dup2(x, 1);
if(ifd != 2 && ofd != 2)
dup2(x, 2);
if(x > 2) /* don't undo what we just did */
close(x);
#else
x = 0; /* shut gcc up */
#endif
rb_lib_init(ilog, irestart, idie, 0, maxfd, dh_size, fd_heap_size);
rb_linebuf_init(lb_heap_size);
rb_linebuf_newbuf(&helper->sendq);
rb_linebuf_newbuf(&helper->recvq);
helper->ifd = rb_open(ifd, RB_FD_PIPE, "incoming connection");
helper->ofd = rb_open(ofd, RB_FD_PIPE, "outgoing connection");
rb_set_nb(helper->ifd);
rb_set_nb(helper->ofd);
helper->read_cb = read_cb;
helper->error_cb = error_cb;
return helper;
}
/*
* start_fork_helper
* starts a new ircd helper
* note that this function doesn't start doing reading..thats the job of the caller
*/
rb_helper *
rb_helper_start(const char *name, const char *fullpath, rb_helper_cb * read_cb,
rb_helper_cb * error_cb)
{
rb_helper *helper;
const char *parv[2];
char buf[128];
char fx[16], fy[16];
rb_fde_t *in_f[2];
rb_fde_t *out_f[2];
pid_t pid;
if(access(fullpath, X_OK) == -1)
return NULL;
helper = rb_malloc(sizeof(rb_helper));
rb_snprintf(buf, sizeof(buf), "%s helper - read", name);
if(rb_pipe(&in_f[0], &in_f[1], buf) < 0) {
rb_free(helper);
return NULL;
}
rb_snprintf(buf, sizeof(buf), "%s helper - write", name);
if(rb_pipe(&out_f[0], &out_f[1], buf) < 0) {
rb_free(helper);
return NULL;
}
rb_snprintf(fx, sizeof(fx), "%d", rb_get_fd(in_f[1]));
rb_snprintf(fy, sizeof(fy), "%d", rb_get_fd(out_f[0]));
rb_set_nb(in_f[0]);
rb_set_nb(in_f[1]);
rb_set_nb(out_f[0]);
rb_set_nb(out_f[1]);
rb_setenv("IFD", fy, 1);
rb_setenv("OFD", fx, 1);
rb_setenv("MAXFD", "256", 1);
rb_snprintf(buf, sizeof(buf), "-ircd %s daemon", name);
parv[0] = buf;
parv[1] = NULL;
#ifdef _WIN32
SetHandleInformation((HANDLE) rb_get_fd(in_f[1]), HANDLE_FLAG_INHERIT, 1);
SetHandleInformation((HANDLE) rb_get_fd(out_f[0]), HANDLE_FLAG_INHERIT, 1);
#endif
pid = rb_spawn_process(fullpath, (const char **)parv);
if(pid == -1) {
rb_close(in_f[0]);
rb_close(in_f[1]);
rb_close(out_f[0]);
rb_close(out_f[1]);
rb_free(helper);
return NULL;
}
rb_close(in_f[1]);
rb_close(out_f[0]);
rb_linebuf_newbuf(&helper->sendq);
rb_linebuf_newbuf(&helper->recvq);
helper->ifd = in_f[0];
helper->ofd = out_f[1];
helper->read_cb = read_cb;
helper->error_cb = error_cb;
helper->fork_count = 0;
helper->pid = pid;
return helper;
}
void
rb_helper_restart(rb_helper *helper)
{
helper->error_cb(helper);
}
static void
rb_helper_write_sendq(rb_fde_t *F, void *helper_ptr)
{
rb_helper *helper = helper_ptr;
int retlen;
if(rb_linebuf_len(&helper->sendq) > 0) {
while((retlen = rb_linebuf_flush(F, &helper->sendq)) > 0)
;;
if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) {
rb_helper_restart(helper);
return;
}
}
if(rb_linebuf_len(&helper->sendq) > 0)
rb_setselect(helper->ofd, RB_SELECT_WRITE, rb_helper_write_sendq, helper);
}
void
rb_helper_write_queue(rb_helper *helper, const char *format, ...)
{
va_list ap;
va_start(ap, format);
rb_linebuf_putmsg(&helper->sendq, format, &ap, NULL);
va_end(ap);
}
void
rb_helper_write_flush(rb_helper *helper)
{
rb_helper_write_sendq(helper->ofd, helper);
}
void
rb_helper_write(rb_helper *helper, const char *format, ...)
{
va_list ap;
va_start(ap, format);
rb_linebuf_putmsg(&helper->sendq, format, &ap, NULL);
va_end(ap);
rb_helper_write_flush(helper);
}
static void
rb_helper_read_cb(rb_fde_t *F, void *data)
{
rb_helper *helper = (rb_helper *)data;
static char buf[32768];
int length;
if(helper == NULL)
return;
while((length = rb_read(helper->ifd, buf, sizeof(buf))) > 0) {
rb_linebuf_parse(&helper->recvq, buf, length, 0);
helper->read_cb(helper);
}
if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) {
rb_helper_restart(helper);
return;
}
rb_setselect(helper->ifd, RB_SELECT_READ, rb_helper_read_cb, helper);
}
void
rb_helper_run(rb_helper *helper)
{
if(helper == NULL)
return;
rb_helper_read_cb(helper->ifd, helper);
}
void
rb_helper_close(rb_helper *helper)
{
if(helper == NULL)
return;
rb_kill(helper->pid, SIGKILL);
rb_close(helper->ifd);
rb_close(helper->ofd);
rb_free(helper);
}
int
rb_helper_read(rb_helper *helper, void *buf, size_t bufsize)
{
return rb_linebuf_get(&helper->recvq, buf, bufsize, LINEBUF_COMPLETE, LINEBUF_PARSED);
}
void
rb_helper_loop(rb_helper *helper, long delay)
{
rb_helper_run(helper);
while(1) {
rb_lib_loop(delay);
}
}