hydra/src/select.c

/*
 *  Hydra, an http server
 *  Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
 *  Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
 *  Some changes Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org>
 *  Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org>
 *  Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* $Id: select.c,v 1.12.2.1 2002/12/14 08:54:16 nmav Exp $*/

#include "boa.h"
#include "loop_signals.h"

#ifndef USE_POLL

static void fdset_update( server_params *);

/* params->server_s[0] is the plain socket, while the 
 * params->server_s[1] is the ssl one.
 */
void* select_loop(void* _params)
{
    server_params* params = _params;
    struct timeval * timeout;

    FD_ZERO(&params->block_read_fdset);
    FD_ZERO(&params->block_write_fdset);

    /* preset max_fd */

    while (1) {

        handle_signals( params);
        
        /* reset max_fd */
        params->max_fd = -1;
        
        if (params->request_block)
           /* move selected req's from request_block to request_ready */
           fdset_update( params);
           
        /* any blocked req's move from request_ready to request_block */
        if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
#ifdef ENABLE_SSL
        if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
#endif

        if (!params->sigterm_flag) {
            if (params->server_s[0].socket != -1) BOA_FD_SET(req, params->server_s[0].socket, &params->block_read_fdset);
#ifdef ENABLE_SSL
            if (params->server_s[1].socket != -1) BOA_FD_SET(req, params->server_s[1].socket, &params->block_read_fdset);
#endif
        }

        SET_TIMEOUT( params->req_timeout.tv_sec, 1, -1);
        params->req_timeout.tv_usec = 0l;   /* reset timeout */
        
        if (params->req_timeout.tv_sec == -1) timeout = NULL;
        else timeout = params->req_timeout;

        if (select(params->max_fd + 1, &params->block_read_fdset,
                   &params->block_write_fdset, NULL, timeout) == -1) 
        {
            /* what is the appropriate thing to do here on EBADF */
            if (errno == EINTR)
                continue;   /* while(1) */
            else if (errno != EBADF) {
                DIE("select");
            }
        }

        if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
            params->server_s[0].pending_requests = 1;
#ifdef ENABLE_SSL
        if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
            params->server_s[1].pending_requests = 1;
#endif
    }
    
    return NULL;
}

/*
 * Name: fdset_update
 *
 * Description: iterate through the blocked requests, checking whether
 * that file descriptor has been set by select.  Update the fd_set to
 * reflect current status.
 *
 * Here, we need to do some things:
 *  - keepalive timeouts simply close
 *    (this is special:: a keepalive timeout is a timeout where
       keepalive is active but nothing has been read yet)
 *  - regular timeouts close + error
 *  - stuff in buffer and fd ready?  write it out
 *  - fd ready for other actions?  do them
 */

static void fdset_update( server_params* params)
{
    request *current, *next;

    for(current = params->request_block;current;current = next) {
        time_t time_since = current_time - current->time_last;
        next = current->next;

        /* hmm, what if we are in "the middle" of a request and not
         * just waiting for a new one... perhaps check to see if anything
         * has been read via header position, etc... */
        if (current->kacount < ka_max && /* we *are* in a keepalive */
            (time_since >= ka_timeout) && /* ka timeout */
            !current->logline)  /* haven't read anything yet */
            current->status = DEAD; /* connection keepalive timed out */
        else if (time_since > REQUEST_TIMEOUT) {
            log_error_doc(current);
            fprintf(stderr, "connection timed out (%d seconds)\n", time_since);
            current->status = DEAD;
        }
        if (current->buffer_end && current->status < DEAD) {
            if (FD_ISSET(current->fd, &params->block_write_fdset))
                ready_request( params, current);
            else {
                BOA_FD_SET( current, current->fd, &params->block_write_fdset);
            }
        } else {
            switch (current->status) {
            case IOSHUFFLE:
#ifndef HAVE_SENDFILE
                if (current->buffer_end - current->buffer_start == 0) {
                    if (FD_ISSET(current->data_fd, &block_read_fdset))
                        ready_request(params, current);
                    break;
                }
#endif
            case WRITE:
            case PIPE_WRITE:
                if (FD_ISSET(current->fd, &params->block_write_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->fd, &params->block_write_fdset);
                }
                break;
            case BODY_WRITE:
                if (FD_ISSET(current->post_data_fd.fds[1], &params->block_write_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->post_data_fd.fds[1], &params->block_write_fdset);
                }
                break;
            case PIPE_READ:
                if (FD_ISSET(current->data_fd, &params->block_read_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->data_fd, &params->block_read_fdset);
                }
                break;
            case DONE:
                if (FD_ISSET(current->fd, &params->block_write_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->fd, &params->block_write_fdset);
                }
                break;
            case DEAD:
                ready_request( params, current);
                break;
            default:
                if (FD_ISSET(current->fd, &params->block_read_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->fd, &params->block_read_fdset);
                }
                break;
            }
        }
        current = next;
    }
}

#endif /* USE_POLL */
1	nmav	1.1	/*
2	nmav	1.6	* Hydra, an http server
3	nmav	1.1	* Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
4			* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
5			* Some changes Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org>
6			* Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org>
7			* Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org>
8			*
9			* This program is free software; you can redistribute it and/or modify
10			* it under the terms of the GNU General Public License as published by
11			* the Free Software Foundation; either version 1, or (at your option)
12			* any later version.
13			*
14			* This program is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17			* GNU General Public License for more details.
18			*
19			* You should have received a copy of the GNU General Public License
20			* along with this program; if not, write to the Free Software
21			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22			*
23			*/
24
25	nmav	1.13	/* $Id: select.c,v 1.12.2.1 2002/12/14 08:54:16 nmav Exp $*/
26	nmav	1.1
27			#include "boa.h"
28	nmav	1.9	#include "loop_signals.h"
29
30			#ifndef USE_POLL
31	nmav	1.1
32			static void fdset_update( server_params *);
33
34			/* params->server_s[0] is the plain socket, while the
35			* params->server_s[1] is the ssl one.
36			*/
37			void* select_loop(void* _params)
38			{
39			server_params* params = _params;
40	nmav	1.13	struct timeval * timeout;
41	nmav	1.1
42			FD_ZERO(&params->block_read_fdset);
43			FD_ZERO(&params->block_write_fdset);
44
45			/* preset max_fd */
46
47			while (1) {
48	nmav	1.3
49	nmav	1.9	handle_signals( params);
50
51	nmav	1.1	/* reset max_fd */
52			params->max_fd = -1;
53	nmav	1.9
54	nmav	1.1	if (params->request_block)
55	nmav	1.9	/* move selected req's from request_block to request_ready */
56			fdset_update( params);
57
58	nmav	1.1	/* any blocked req's move from request_ready to request_block */
59	nmav	1.2	if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
60			#ifdef ENABLE_SSL
61			if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
62			#endif
63	nmav	1.1
64	nmav	1.7	if (!params->sigterm_flag) {
65	nmav	1.9	if (params->server_s[0].socket != -1) BOA_FD_SET(req, params->server_s[0].socket, &params->block_read_fdset);
66	nmav	1.2	#ifdef ENABLE_SSL
67	nmav	1.9	if (params->server_s[1].socket != -1) BOA_FD_SET(req, params->server_s[1].socket, &params->block_read_fdset);
68	nmav	1.2	#endif
69	nmav	1.1	}
70	nmav	1.13
71			SET_TIMEOUT( params->req_timeout.tv_sec, 1, -1);
72			params->req_timeout.tv_usec = 0l; /* reset timeout */
73	nmav	1.9
74	nmav	1.13	if (params->req_timeout.tv_sec == -1) timeout = NULL;
75			else timeout = params->req_timeout;
76	nmav	1.1
77			if (select(params->max_fd + 1, &params->block_read_fdset,
78	nmav	1.13	&params->block_write_fdset, NULL, timeout) == -1)
79	nmav	1.9	{
80	nmav	1.1	/* what is the appropriate thing to do here on EBADF */
81			if (errno == EINTR)
82			continue; /* while(1) */
83			else if (errno != EBADF) {
84			DIE("select");
85			}
86			}
87
88			if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
89			params->server_s[0].pending_requests = 1;
90	nmav	1.2	#ifdef ENABLE_SSL
91	nmav	1.1	if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
92			params->server_s[1].pending_requests = 1;
93	nmav	1.2	#endif
94	nmav	1.1	}
95
96			return NULL;
97			}
98
99			/*
100			* Name: fdset_update
101			*
102			* Description: iterate through the blocked requests, checking whether
103			* that file descriptor has been set by select. Update the fd_set to
104			* reflect current status.
105			*
106			* Here, we need to do some things:
107			* - keepalive timeouts simply close
108			* (this is special:: a keepalive timeout is a timeout where
109			keepalive is active but nothing has been read yet)
110			* - regular timeouts close + error
111			* - stuff in buffer and fd ready? write it out
112			* - fd ready for other actions? do them
113			*/
114
115			static void fdset_update( server_params* params)
116			{
117			request current, next;
118
119			for(current = params->request_block;current;current = next) {
120			time_t time_since = current_time - current->time_last;
121			next = current->next;
122
123			/* hmm, what if we are in "the middle" of a request and not
124			* just waiting for a new one... perhaps check to see if anything
125			* has been read via header position, etc... */
126			if (current->kacount < ka_max && /* we are in a keepalive */
127			(time_since >= ka_timeout) && /* ka timeout */
128			!current->logline) /* haven't read anything yet */
129			current->status = DEAD; /* connection keepalive timed out */
130			else if (time_since > REQUEST_TIMEOUT) {
131			log_error_doc(current);
132	nmav	1.13	fprintf(stderr, "connection timed out (%d seconds)\n", time_since);
133	nmav	1.1	current->status = DEAD;
134			}
135			if (current->buffer_end && current->status < DEAD) {
136			if (FD_ISSET(current->fd, &params->block_write_fdset))
137			ready_request( params, current);
138			else {
139	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
140	nmav	1.1	}
141			} else {
142			switch (current->status) {
143	nmav	1.9	case IOSHUFFLE:
144			#ifndef HAVE_SENDFILE
145			if (current->buffer_end - current->buffer_start == 0) {
146			if (FD_ISSET(current->data_fd, &block_read_fdset))
147			ready_request(params, current);
148			break;
149			}
150			#endif
151	nmav	1.1	case WRITE:
152			case PIPE_WRITE:
153			if (FD_ISSET(current->fd, &params->block_write_fdset))
154			ready_request( params, current);
155			else {
156	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
157	nmav	1.1	}
158			break;
159			case BODY_WRITE:
160	nmav	1.12	if (FD_ISSET(current->post_data_fd.fds[1], &params->block_write_fdset))
161	nmav	1.1	ready_request( params, current);
162			else {
163	nmav	1.12	BOA_FD_SET( current, current->post_data_fd.fds[1], &params->block_write_fdset);
164	nmav	1.1	}
165			break;
166			case PIPE_READ:
167			if (FD_ISSET(current->data_fd, &params->block_read_fdset))
168			ready_request( params, current);
169			else {
170	nmav	1.9	BOA_FD_SET( current, current->data_fd, &params->block_read_fdset);
171	nmav	1.1	}
172			break;
173			case DONE:
174			if (FD_ISSET(current->fd, &params->block_write_fdset))
175			ready_request( params, current);
176			else {
177	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
178	nmav	1.1	}
179			break;
180			case DEAD:
181			ready_request( params, current);
182			break;
183			default:
184			if (FD_ISSET(current->fd, &params->block_read_fdset))
185			ready_request( params, current);
186			else {
187	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_read_fdset);
188	nmav	1.1	}
189			break;
190			}
191			}
192			current = next;
193			}
194			}
195
196	nmav	1.9	#endif /* USE_POLL */