341 lines
8.0 KiB
C
341 lines
8.0 KiB
C
/* $NetBSD: daemon-bozo.c,v 1.21 2019/01/17 07:46:16 mrg Exp $ */
|
|
|
|
/* $eterna: daemon-bozo.c,v 1.24 2011/11/18 09:21:15 mrg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1997-2019 Matthew R. Green
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer and
|
|
* dedication in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
/* this code implements daemon mode for bozohttpd */
|
|
|
|
#ifndef NO_DAEMON_MODE
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <netdb.h>
|
|
#include <poll.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "bozohttpd.h"
|
|
|
|
static void sigchild(int); /* SIGCHLD handler */
|
|
|
|
#ifndef POLLRDNORM
|
|
#define POLLRDNORM 0
|
|
#endif
|
|
#ifndef POLLRDBAND
|
|
#define POLLRDBAND 0
|
|
#endif
|
|
#ifndef INFTIM
|
|
#define INFTIM -1
|
|
#endif
|
|
|
|
static const char* pidfile_path = NULL;
|
|
static pid_t pidfile_pid = 0;
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
sigchild(int signo)
|
|
{
|
|
|
|
while (waitpid(-1, NULL, WNOHANG) > 0)
|
|
/* nothing */;
|
|
}
|
|
|
|
/* Signal handler to exit in a controlled manner. This ensures that
|
|
* any atexit(3) handlers are properly executed. */
|
|
/* ARGSUSED */
|
|
BOZO_DEAD static void
|
|
controlled_exit(int signo)
|
|
{
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
remove_pidfile(void)
|
|
{
|
|
|
|
if (pidfile_path != NULL && pidfile_pid == getpid()) {
|
|
(void)unlink(pidfile_path);
|
|
pidfile_path = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
create_pidfile(bozohttpd_t *httpd)
|
|
{
|
|
FILE *file;
|
|
|
|
assert(pidfile_path == NULL);
|
|
|
|
if (httpd->pidfile == NULL)
|
|
return;
|
|
|
|
if (atexit(remove_pidfile) == -1)
|
|
bozoerr(httpd, 1, "Failed to install pidfile handler");
|
|
|
|
if ((file = fopen(httpd->pidfile, "w")) == NULL)
|
|
bozoerr(httpd, 1, "Failed to create pidfile '%s'",
|
|
httpd->pidfile);
|
|
(void)fprintf(file, "%d\n", getpid());
|
|
(void)fclose(file);
|
|
|
|
pidfile_path = httpd->pidfile;
|
|
pidfile_pid = getpid();
|
|
|
|
debug((httpd, DEBUG_FAT, "Created pid file '%s' for pid %d",
|
|
pidfile_path, pidfile_pid));
|
|
}
|
|
|
|
void
|
|
bozo_daemon_init(bozohttpd_t *httpd)
|
|
{
|
|
struct addrinfo h, *r, *r0;
|
|
const char *portnum;
|
|
int e, i, on = 1;
|
|
|
|
if (!httpd->background)
|
|
return;
|
|
|
|
portnum = (httpd->bindport) ? httpd->bindport : "http";
|
|
|
|
memset(&h, 0, sizeof(h));
|
|
h.ai_family = PF_UNSPEC;
|
|
h.ai_socktype = SOCK_STREAM;
|
|
h.ai_flags = AI_PASSIVE;
|
|
e = getaddrinfo(httpd->bindaddress, portnum, &h, &r0);
|
|
if (e)
|
|
bozoerr(httpd, 1, "getaddrinfo([%s]:%s): %s",
|
|
httpd->bindaddress ? httpd->bindaddress : "*",
|
|
portnum, gai_strerror(e));
|
|
for (r = r0; r != NULL; r = r->ai_next)
|
|
httpd->nsock++;
|
|
httpd->sock = bozomalloc(httpd, httpd->nsock * sizeof(*httpd->sock));
|
|
httpd->fds = bozomalloc(httpd, httpd->nsock * sizeof(*httpd->fds));
|
|
for (i = 0, r = r0; r != NULL; r = r->ai_next) {
|
|
httpd->sock[i] = socket(r->ai_family, SOCK_STREAM, 0);
|
|
if (httpd->sock[i] == -1)
|
|
continue;
|
|
if (setsockopt(httpd->sock[i], SOL_SOCKET, SO_REUSEADDR, &on,
|
|
sizeof(on)) == -1)
|
|
bozowarn(httpd, "setsockopt SO_REUSEADDR: %s",
|
|
strerror(errno));
|
|
if (bind(httpd->sock[i], r->ai_addr, r->ai_addrlen) == -1)
|
|
continue;
|
|
if (listen(httpd->sock[i], SOMAXCONN) == -1)
|
|
continue;
|
|
httpd->fds[i].events = POLLIN | POLLPRI | POLLRDNORM |
|
|
POLLRDBAND | POLLERR;
|
|
httpd->fds[i].fd = httpd->sock[i];
|
|
i++;
|
|
}
|
|
if (i == 0)
|
|
bozoerr(httpd, 1, "could not find any addresses to bind");
|
|
httpd->nsock = i;
|
|
freeaddrinfo(r0);
|
|
|
|
if (httpd->foreground == 0)
|
|
daemon(1, 0);
|
|
|
|
create_pidfile(httpd);
|
|
|
|
bozowarn(httpd, "started in daemon mode as `%s' port `%s' root `%s'",
|
|
httpd->virthostname, portnum, httpd->slashdir);
|
|
|
|
signal(SIGHUP, controlled_exit);
|
|
signal(SIGINT, controlled_exit);
|
|
signal(SIGTERM, controlled_exit);
|
|
|
|
signal(SIGCHLD, sigchild);
|
|
}
|
|
|
|
void
|
|
bozo_daemon_closefds(bozohttpd_t *httpd)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < httpd->nsock; i++)
|
|
close(httpd->sock[i]);
|
|
}
|
|
|
|
static void
|
|
daemon_runchild(bozohttpd_t *httpd, int fd)
|
|
{
|
|
httpd->request_times++;
|
|
|
|
/* setup stdin/stdout/stderr */
|
|
dup2(fd, 0);
|
|
dup2(fd, 1);
|
|
/*dup2(fd, 2);*/
|
|
close(fd);
|
|
}
|
|
|
|
static int
|
|
daemon_poll_err(bozohttpd_t *httpd, int idx)
|
|
{
|
|
if ((httpd->fds[idx].revents & (POLLNVAL|POLLERR|POLLHUP)) == 0)
|
|
return 0;
|
|
|
|
bozowarn(httpd, "poll on fd %d pid %d revents %d: %s",
|
|
httpd->fds[idx].fd, getpid(), httpd->fds[idx].revents,
|
|
strerror(errno));
|
|
bozowarn(httpd, "nsock = %d", httpd->nsock);
|
|
close(httpd->sock[idx]);
|
|
httpd->nsock--;
|
|
bozowarn(httpd, "nsock now = %d", httpd->nsock);
|
|
/* no sockets left */
|
|
if (httpd->nsock == 0)
|
|
exit(0);
|
|
/* last socket closed is the easy case */
|
|
if (httpd->nsock != idx) {
|
|
memmove(&httpd->fds[idx], &httpd->fds[idx+1],
|
|
(httpd->nsock - idx) * sizeof(*httpd->fds));
|
|
memmove(&httpd->sock[idx], &httpd->sock[idx+1],
|
|
(httpd->nsock - idx) * sizeof(*httpd->sock));
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* the parent never returns from this function, only children that
|
|
* are ready to run... XXXMRG - still true in fork-lesser bozo?
|
|
*/
|
|
int
|
|
bozo_daemon_fork(bozohttpd_t *httpd)
|
|
{
|
|
int i;
|
|
|
|
debug((httpd, DEBUG_FAT, "%s: pid %u request_times %d",
|
|
__func__, getpid(),
|
|
httpd->request_times));
|
|
/* if we've handled 5 files, exit and let someone else work */
|
|
if (httpd->request_times > 5 ||
|
|
(httpd->background == 2 && httpd->request_times > 0))
|
|
_exit(0);
|
|
|
|
#if 1
|
|
if (httpd->request_times > 0)
|
|
_exit(0);
|
|
#endif
|
|
|
|
while (httpd->background) {
|
|
struct sockaddr_storage ss;
|
|
socklen_t slen;
|
|
int fd;
|
|
|
|
if (httpd->nsock == 0)
|
|
exit(0);
|
|
|
|
/*
|
|
* wait for a connection, then fork() and return NULL in
|
|
* the parent, who will come back here waiting for another
|
|
* connection. read the request in in the child, and return
|
|
* it, for processing.
|
|
*/
|
|
again:
|
|
if (poll(httpd->fds, (unsigned)httpd->nsock, INFTIM) == -1) {
|
|
/* fail on programmer errors */
|
|
if (errno == EFAULT ||
|
|
errno == EINVAL)
|
|
bozoerr(httpd, 1, "poll: %s",
|
|
strerror(errno));
|
|
|
|
/* sleep on some temporary kernel failures */
|
|
if (errno == ENOMEM ||
|
|
errno == EAGAIN)
|
|
sleep(1);
|
|
|
|
goto again;
|
|
}
|
|
|
|
for (i = 0; i < httpd->nsock; i++) {
|
|
if (daemon_poll_err(httpd, i))
|
|
break;
|
|
if (httpd->fds[i].revents == 0)
|
|
continue;
|
|
|
|
slen = sizeof(ss);
|
|
fd = accept(httpd->fds[i].fd,
|
|
(struct sockaddr *)(void *)&ss, &slen);
|
|
if (fd == -1) {
|
|
if (errno == EFAULT ||
|
|
errno == EINVAL)
|
|
bozoerr(httpd, 1, "accept: %s",
|
|
strerror(errno));
|
|
|
|
if (errno == ENOMEM ||
|
|
errno == EAGAIN)
|
|
sleep(1);
|
|
|
|
continue;
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* This code doesn't work. It interacts very poorly
|
|
* with ~user translation and needs to be fixed.
|
|
*/
|
|
if (httpd->request_times > 0) {
|
|
daemon_runchild(httpd, fd);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
switch (fork()) {
|
|
case -1: /* eep, failure */
|
|
bozowarn(httpd, "fork() failed, sleeping for "
|
|
"10 seconds: %s", strerror(errno));
|
|
close(fd);
|
|
sleep(10);
|
|
break;
|
|
|
|
case 0: /* child */
|
|
daemon_runchild(httpd, fd);
|
|
return 0;
|
|
|
|
default: /* parent */
|
|
close(fd);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* NO_DAEMON_MODE */
|