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 1.10 2002/10/21 19:10:31 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;

    FD_ZERO(&params->block_read_fdset);
    FD_ZERO(&params->block_write_fdset);
    /* set server_s and req_timeout */
    params->req_timeout.tv_sec = (ka_timeout ? ka_timeout : REQUEST_TIMEOUT);
    params->req_timeout.tv_usec = 0l;   /* reset timeout */

    /* 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
        }
        
        params->req_timeout.tv_sec = ((params->request_ready) ? 0 :
                              (ka_timeout ? ka_timeout : REQUEST_TIMEOUT));
        params->req_timeout.tv_usec = 0l;   /* reset timeout */

        if (select(params->max_fd + 1, &params->block_read_fdset,
                   &params->block_write_fdset, NULL,
                   ((params->request_ready || params->request_block) ? &params->req_timeout : NULL)) == -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);
            fputs("connection timed out\n", stderr);
            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, &params->block_write_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET( current, current->post_data_fd, &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	1.11	/* $Id: select.c,v 1.10 2002/10/21 19:10:31 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
41			FD_ZERO(&params->block_read_fdset);
42			FD_ZERO(&params->block_write_fdset);
43			/* set server_s and req_timeout */
44			params->req_timeout.tv_sec = (ka_timeout ? ka_timeout : REQUEST_TIMEOUT);
45			params->req_timeout.tv_usec = 0l; /* reset timeout */
46
47			/* preset max_fd */
48
49			while (1) {
50	nmav	1.3
51	nmav	1.9	handle_signals( params);
52
53	nmav	1.1	/* reset max_fd */
54			params->max_fd = -1;
55	nmav	1.9
56	nmav	1.1	if (params->request_block)
57	nmav	1.9	/* move selected req's from request_block to request_ready */
58			fdset_update( params);
59
60	nmav	1.1	/* any blocked req's move from request_ready to request_block */
61	nmav	1.2	if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
62			#ifdef ENABLE_SSL
63			if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
64			#endif
65	nmav	1.1
66	nmav	1.7	if (!params->sigterm_flag) {
67	nmav	1.9	if (params->server_s[0].socket != -1) BOA_FD_SET(req, params->server_s[0].socket, &params->block_read_fdset);
68	nmav	1.2	#ifdef ENABLE_SSL
69	nmav	1.9	if (params->server_s[1].socket != -1) BOA_FD_SET(req, params->server_s[1].socket, &params->block_read_fdset);
70	nmav	1.2	#endif
71	nmav	1.1	}
72	nmav	1.9
73	nmav	1.1	params->req_timeout.tv_sec = ((params->request_ready) ? 0 :
74			(ka_timeout ? ka_timeout : REQUEST_TIMEOUT));
75			params->req_timeout.tv_usec = 0l; /* reset timeout */
76
77			if (select(params->max_fd + 1, &params->block_read_fdset,
78			&params->block_write_fdset, NULL,
79	nmav	1.9	((params->request_ready \|\| params->request_block) ? &params->req_timeout : NULL)) == -1)
80			{
81	nmav	1.1	/* what is the appropriate thing to do here on EBADF */
82			if (errno == EINTR)
83			continue; /* while(1) */
84			else if (errno != EBADF) {
85			DIE("select");
86			}
87			}
88
89			if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
90			params->server_s[0].pending_requests = 1;
91	nmav	1.2	#ifdef ENABLE_SSL
92	nmav	1.1	if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
93			params->server_s[1].pending_requests = 1;
94	nmav	1.2	#endif
95	nmav	1.1	}
96
97			return NULL;
98			}
99
100			/*
101			* Name: fdset_update
102			*
103			* Description: iterate through the blocked requests, checking whether
104			* that file descriptor has been set by select. Update the fd_set to
105			* reflect current status.
106			*
107			* Here, we need to do some things:
108			* - keepalive timeouts simply close
109			* (this is special:: a keepalive timeout is a timeout where
110			keepalive is active but nothing has been read yet)
111			* - regular timeouts close + error
112			* - stuff in buffer and fd ready? write it out
113			* - fd ready for other actions? do them
114			*/
115
116			static void fdset_update( server_params* params)
117			{
118			request current, next;
119
120			for(current = params->request_block;current;current = next) {
121			time_t time_since = current_time - current->time_last;
122			next = current->next;
123
124			/* hmm, what if we are in "the middle" of a request and not
125			* just waiting for a new one... perhaps check to see if anything
126			* has been read via header position, etc... */
127			if (current->kacount < ka_max && /* we are in a keepalive */
128			(time_since >= ka_timeout) && /* ka timeout */
129			!current->logline) /* haven't read anything yet */
130			current->status = DEAD; /* connection keepalive timed out */
131			else if (time_since > REQUEST_TIMEOUT) {
132			log_error_doc(current);
133			fputs("connection timed out\n", stderr);
134			current->status = DEAD;
135			}
136			if (current->buffer_end && current->status < DEAD) {
137			if (FD_ISSET(current->fd, &params->block_write_fdset))
138			ready_request( params, current);
139			else {
140	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
141	nmav	1.1	}
142			} else {
143			switch (current->status) {
144	nmav	1.9	case IOSHUFFLE:
145			#ifndef HAVE_SENDFILE
146			if (current->buffer_end - current->buffer_start == 0) {
147			if (FD_ISSET(current->data_fd, &block_read_fdset))
148			ready_request(params, current);
149			break;
150			}
151			#endif
152	nmav	1.1	case WRITE:
153			case PIPE_WRITE:
154			if (FD_ISSET(current->fd, &params->block_write_fdset))
155			ready_request( params, current);
156			else {
157	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
158	nmav	1.1	}
159			break;
160			case BODY_WRITE:
161			if (FD_ISSET(current->post_data_fd, &params->block_write_fdset))
162			ready_request( params, current);
163			else {
164	nmav	1.9	BOA_FD_SET( current, current->post_data_fd, &params->block_write_fdset);
165	nmav	1.1	}
166			break;
167			case PIPE_READ:
168			if (FD_ISSET(current->data_fd, &params->block_read_fdset))
169			ready_request( params, current);
170			else {
171	nmav	1.9	BOA_FD_SET( current, current->data_fd, &params->block_read_fdset);
172	nmav	1.1	}
173			break;
174			case DONE:
175			if (FD_ISSET(current->fd, &params->block_write_fdset))
176			ready_request( params, current);
177			else {
178	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_write_fdset);
179	nmav	1.1	}
180			break;
181			case DEAD:
182			ready_request( params, current);
183			break;
184			default:
185			if (FD_ISSET(current->fd, &params->block_read_fdset))
186			ready_request( params, current);
187			else {
188	nmav	1.9	BOA_FD_SET( current, current->fd, &params->block_read_fdset);
189	nmav	1.1	}
190			break;
191			}
192			}
193			current = next;
194			}
195			}
196
197	nmav	1.9	#endif /* USE_POLL */