345 lines
8.1 KiB
C
345 lines
8.1 KiB
C
/* $NetBSD: daemon-bozo.c,v 1.22 2020/10/15 04:21:53 mrg Exp $ */
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/* $eterna: daemon-bozo.c,v 1.24 2011/11/18 09:21:15 mrg Exp $ */
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/*
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* Copyright (c) 1997-2019 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer and
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* dedication in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/* this code implements daemon mode for bozohttpd */
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#ifndef NO_DAEMON_MODE
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <assert.h>
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#include <errno.h>
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#include <netdb.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "bozohttpd.h"
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static void sigchild(int); /* SIGCHLD handler */
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#ifndef POLLRDNORM
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#define POLLRDNORM 0
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#endif
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#ifndef POLLRDBAND
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#define POLLRDBAND 0
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#endif
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#ifndef INFTIM
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#define INFTIM -1
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#endif
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#ifndef USE_ARG
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#define USE_ARG(x) /*LINTED*/(void)&(x)
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#endif
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static const char* pidfile_path = NULL;
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static pid_t pidfile_pid = 0;
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static void
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sigchild(int signo)
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{
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USE_ARG(signo);
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while (waitpid(-1, NULL, WNOHANG) > 0)
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/* nothing */;
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}
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/* Signal handler to exit in a controlled manner. This ensures that
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* any atexit(3) handlers are properly executed. */
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BOZO_DEAD static void
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controlled_exit(int signo)
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{
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USE_ARG(signo);
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exit(EXIT_SUCCESS);
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}
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static void
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remove_pidfile(void)
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{
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if (pidfile_path != NULL && pidfile_pid == getpid()) {
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(void)unlink(pidfile_path);
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pidfile_path = NULL;
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}
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}
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static void
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create_pidfile(bozohttpd_t *httpd)
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{
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FILE *file;
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assert(pidfile_path == NULL);
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if (httpd->pidfile == NULL)
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return;
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if (atexit(remove_pidfile) == -1)
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bozoerr(httpd, 1, "Failed to install pidfile handler");
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if ((file = fopen(httpd->pidfile, "w")) == NULL)
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bozoerr(httpd, 1, "Failed to create pidfile '%s'",
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httpd->pidfile);
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(void)fprintf(file, "%d\n", getpid());
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(void)fclose(file);
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pidfile_path = httpd->pidfile;
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pidfile_pid = getpid();
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debug((httpd, DEBUG_FAT, "Created pid file '%s' for pid %d",
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pidfile_path, pidfile_pid));
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}
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void
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bozo_daemon_init(bozohttpd_t *httpd)
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{
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struct addrinfo h, *r, *r0;
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const char *portnum;
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int e, i, on = 1;
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if (!httpd->background && !httpd->foreground)
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return;
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if (!httpd->background)
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httpd->background = 1;
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portnum = (httpd->bindport) ? httpd->bindport : "http";
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memset(&h, 0, sizeof(h));
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h.ai_family = PF_UNSPEC;
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h.ai_socktype = SOCK_STREAM;
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h.ai_flags = AI_PASSIVE;
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e = getaddrinfo(httpd->bindaddress, portnum, &h, &r0);
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if (e)
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bozoerr(httpd, 1, "getaddrinfo([%s]:%s): %s",
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httpd->bindaddress ? httpd->bindaddress : "*",
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portnum, gai_strerror(e));
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for (r = r0; r != NULL; r = r->ai_next)
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httpd->nsock++;
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httpd->sock = bozomalloc(httpd, httpd->nsock * sizeof(*httpd->sock));
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httpd->fds = bozomalloc(httpd, httpd->nsock * sizeof(*httpd->fds));
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for (i = 0, r = r0; r != NULL; r = r->ai_next) {
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httpd->sock[i] = socket(r->ai_family, SOCK_STREAM, 0);
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if (httpd->sock[i] == -1)
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continue;
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if (setsockopt(httpd->sock[i], SOL_SOCKET, SO_REUSEADDR, &on,
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sizeof(on)) == -1)
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bozowarn(httpd, "setsockopt SO_REUSEADDR: %s",
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strerror(errno));
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if (bind(httpd->sock[i], r->ai_addr, r->ai_addrlen) == -1)
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continue;
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if (listen(httpd->sock[i], SOMAXCONN) == -1)
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continue;
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httpd->fds[i].events = POLLIN | POLLPRI | POLLRDNORM |
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POLLRDBAND | POLLERR;
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httpd->fds[i].fd = httpd->sock[i];
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i++;
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}
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if (i == 0)
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bozoerr(httpd, 1, "could not find any addresses to bind");
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httpd->nsock = i;
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freeaddrinfo(r0);
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if (httpd->foreground == 0)
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daemon(1, 0);
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create_pidfile(httpd);
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bozowarn(httpd, "started in daemon mode as `%s' port `%s' root `%s'",
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httpd->virthostname, portnum, httpd->slashdir);
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signal(SIGHUP, controlled_exit);
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signal(SIGINT, controlled_exit);
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signal(SIGTERM, controlled_exit);
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signal(SIGCHLD, sigchild);
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}
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void
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bozo_daemon_closefds(bozohttpd_t *httpd)
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{
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int i;
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for (i = 0; i < httpd->nsock; i++)
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close(httpd->sock[i]);
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}
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static void
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daemon_runchild(bozohttpd_t *httpd, int fd)
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{
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httpd->request_times++;
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/* setup stdin/stdout/stderr */
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dup2(fd, 0);
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dup2(fd, 1);
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/*dup2(fd, 2);*/
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close(fd);
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}
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static int
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daemon_poll_err(bozohttpd_t *httpd, int idx)
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{
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if ((httpd->fds[idx].revents & (POLLNVAL|POLLERR|POLLHUP)) == 0)
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return 0;
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bozowarn(httpd, "poll on fd %d pid %d revents %d: %s",
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httpd->fds[idx].fd, getpid(), httpd->fds[idx].revents,
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strerror(errno));
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bozowarn(httpd, "nsock = %d", httpd->nsock);
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close(httpd->sock[idx]);
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httpd->nsock--;
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bozowarn(httpd, "nsock now = %d", httpd->nsock);
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/* no sockets left */
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if (httpd->nsock == 0)
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exit(0);
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/* last socket closed is the easy case */
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if (httpd->nsock != idx) {
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memmove(&httpd->fds[idx], &httpd->fds[idx+1],
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(httpd->nsock - idx) * sizeof(*httpd->fds));
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memmove(&httpd->sock[idx], &httpd->sock[idx+1],
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(httpd->nsock - idx) * sizeof(*httpd->sock));
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}
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return 1;
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}
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/*
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* the parent never returns from this function, only children that
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* are ready to run... XXXMRG - still true in fork-lesser bozo?
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*/
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int
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bozo_daemon_fork(bozohttpd_t *httpd)
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{
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int i;
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debug((httpd, DEBUG_FAT, "%s: pid %u request_times %d",
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__func__, getpid(),
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httpd->request_times));
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/* if we've handled 5 files, exit and let someone else work */
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if (httpd->request_times > 5 ||
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(httpd->background == 2 && httpd->request_times > 0))
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_exit(0);
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#if 1
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if (httpd->request_times > 0)
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_exit(0);
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#endif
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while (httpd->background) {
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struct sockaddr_storage ss;
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socklen_t slen;
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int fd;
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if (httpd->nsock == 0)
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exit(0);
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/*
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* wait for a connection, then fork() and return NULL in
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* the parent, who will come back here waiting for another
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* connection. read the request in in the child, and return
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* it, for processing.
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*/
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again:
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if (poll(httpd->fds, (unsigned)httpd->nsock, INFTIM) == -1) {
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/* fail on programmer errors */
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if (errno == EFAULT ||
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errno == EINVAL)
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bozoerr(httpd, 1, "poll: %s",
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strerror(errno));
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/* sleep on some temporary kernel failures */
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if (errno == ENOMEM ||
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errno == EAGAIN)
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sleep(1);
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goto again;
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}
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for (i = 0; i < httpd->nsock; i++) {
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if (daemon_poll_err(httpd, i))
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break;
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if (httpd->fds[i].revents == 0)
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continue;
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slen = sizeof(ss);
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fd = accept(httpd->fds[i].fd,
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(struct sockaddr *)(void *)&ss, &slen);
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if (fd == -1) {
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if (errno == EFAULT ||
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errno == EINVAL)
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bozoerr(httpd, 1, "accept: %s",
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strerror(errno));
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if (errno == ENOMEM ||
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errno == EAGAIN)
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sleep(1);
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continue;
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}
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#if 0
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/*
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* This code doesn't work. It interacts very poorly
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* with ~user translation and needs to be fixed.
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*/
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if (httpd->request_times > 0) {
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daemon_runchild(httpd, fd);
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return 0;
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}
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#endif
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switch (fork()) {
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case -1: /* eep, failure */
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bozowarn(httpd, "fork() failed, sleeping for "
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"10 seconds: %s", strerror(errno));
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close(fd);
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sleep(10);
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break;
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case 0: /* child */
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daemon_runchild(httpd, fd);
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return 0;
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default: /* parent */
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close(fd);
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break;
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}
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}
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}
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return 0;
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}
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#endif /* NO_DAEMON_MODE */
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