hydra/src/select.c

/*
 *  Boa, 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 1.1.1.1 2002/09/21 13:53:46 nmav Exp $*/

#include "boa.h"
#ifdef ENABLE_SMP
# include <pthread.h>

extern pthread_t father_id;

#endif

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;

#ifdef ENABLE_SMP
    pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL);
    pthread_setcanceltype( PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
#endif

    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 */
    params->max_fd = -1;

    while (1) {
#ifdef ENABLE_SMP
        /* Only the main thread handles signals.
         */
        if (pthread_equal( params->tid, father_id)) {
#endif
           if (params->sighup_flag)
               sighup_run();
           if (params->sigchld_flag)
               sigchld_run();
           if (params->sigalrm_flag)
               sigalrm_run();
           if (params->sigusr1_flag)
               sigusr1_run();

           if (params->sigterm_flag) {
               if (params->sigterm_flag == 1) {
                   sigterm_stage1_run();
               }
               if (params->sigterm_flag == 2 && !params->request_ready && !params->request_block) {
                   sigterm_stage2_run();
               }
           }
#ifdef ENABLE_SMP
        }
#endif

        /* 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 && params->total_connections < (max_connections - 10)) {
            if (params->server_s[0].socket != -1) BOA_FD_SET(params->server_s[0].socket, &params->block_read_fdset); /* server always set */
#ifdef ENABLE_SSL
            if (params->server_s[1].socket != -1) BOA_FD_SET(params->server_s[1].socket, &params->block_read_fdset); /* server always set */
#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");
            }
        }

        time(&current_time);
        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->fd, &params->block_write_fdset);
            }
        } else {
            switch (current->status) {
            case WRITE:
            case PIPE_WRITE:
                if (FD_ISSET(current->fd, &params->block_write_fdset))
                    ready_request( params, current);
                else {
                    BOA_FD_SET(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->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->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->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->fd, &params->block_read_fdset);
                }
                break;
            }
        }
        current = next;
    }
}

1	/*
2	* Boa, an http server
3	* 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	/* $Id: select.c,v 1.1.1.1 2002/09/21 13:53:46 nmav Exp $*/
26
27	#include "boa.h"
28	#ifdef ENABLE_SMP
29	# include <pthread.h>
30
31	extern pthread_t father_id;
32
33	#endif
34
35	static void fdset_update( server_params *);
36
37	/* params->server_s[0] is the plain socket, while the
38	* params->server_s[1] is the ssl one.
39	*/
40	void* select_loop(void* _params)
41	{
42	server_params* params = _params;
43
44	#ifdef ENABLE_SMP
45	pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL);
46	pthread_setcanceltype( PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
47	#endif
48
49	FD_ZERO(&params->block_read_fdset);
50	FD_ZERO(&params->block_write_fdset);
51	/* set server_s and req_timeout */
52	params->req_timeout.tv_sec = (ka_timeout ? ka_timeout : REQUEST_TIMEOUT);
53	params->req_timeout.tv_usec = 0l; /* reset timeout */
54
55	/* preset max_fd */
56	params->max_fd = -1;
57
58	while (1) {
59	#ifdef ENABLE_SMP
60	/* Only the main thread handles signals.
61	*/
62	if (pthread_equal( params->tid, father_id)) {
63	#endif
64	if (params->sighup_flag)
65	sighup_run();
66	if (params->sigchld_flag)
67	sigchld_run();
68	if (params->sigalrm_flag)
69	sigalrm_run();
70	if (params->sigusr1_flag)
71	sigusr1_run();
72
73	if (params->sigterm_flag) {
74	if (params->sigterm_flag == 1) {
75	sigterm_stage1_run();
76	}
77	if (params->sigterm_flag == 2 && !params->request_ready && !params->request_block) {
78	sigterm_stage2_run();
79	}
80	}
81	#ifdef ENABLE_SMP
82	}
83	#endif
84
85	/* reset max_fd */
86	params->max_fd = -1;
87
88	if (params->request_block)
89	/* move selected req's from request_block to request_ready */
90	fdset_update( params);
91
92	/* any blocked req's move from request_ready to request_block */
93	if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
94	#ifdef ENABLE_SSL
95	if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
96	#endif
97
98	if (!params->sigterm_flag && params->total_connections < (max_connections - 10)) {
99	if (params->server_s[0].socket != -1) BOA_FD_SET(params->server_s[0].socket, &params->block_read_fdset); /* server always set */
100	#ifdef ENABLE_SSL
101	if (params->server_s[1].socket != -1) BOA_FD_SET(params->server_s[1].socket, &params->block_read_fdset); /* server always set */
102	#endif
103	}
104
105	params->req_timeout.tv_sec = ((params->request_ready) ? 0 :
106	(ka_timeout ? ka_timeout : REQUEST_TIMEOUT));
107	params->req_timeout.tv_usec = 0l; /* reset timeout */
108
109	if (select(params->max_fd + 1, &params->block_read_fdset,
110	&params->block_write_fdset, NULL,
111	((params->request_ready \|\| params->request_block) ? &params->req_timeout : NULL)) == -1) {
112	/* what is the appropriate thing to do here on EBADF */
113	if (errno == EINTR)
114	continue; /* while(1) */
115	else if (errno != EBADF) {
116	DIE("select");
117	}
118	}
119
120	time(&current_time);
121	if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
122	params->server_s[0].pending_requests = 1;
123	#ifdef ENABLE_SSL
124	if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
125	params->server_s[1].pending_requests = 1;
126	#endif
127	}
128
129	return NULL;
130	}
131
132	/*
133	* Name: fdset_update
134	*
135	* Description: iterate through the blocked requests, checking whether
136	* that file descriptor has been set by select. Update the fd_set to
137	* reflect current status.
138	*
139	* Here, we need to do some things:
140	* - keepalive timeouts simply close
141	* (this is special:: a keepalive timeout is a timeout where
142	keepalive is active but nothing has been read yet)
143	* - regular timeouts close + error
144	* - stuff in buffer and fd ready? write it out
145	* - fd ready for other actions? do them
146	*/
147
148	static void fdset_update( server_params* params)
149	{
150	request current, next;
151
152	for(current = params->request_block;current;current = next) {
153	time_t time_since = current_time - current->time_last;
154	next = current->next;
155
156	/* hmm, what if we are in "the middle" of a request and not
157	* just waiting for a new one... perhaps check to see if anything
158	* has been read via header position, etc... */
159	if (current->kacount < ka_max && /* we are in a keepalive */
160	(time_since >= ka_timeout) && /* ka timeout */
161	!current->logline) /* haven't read anything yet */
162	current->status = DEAD; /* connection keepalive timed out */
163	else if (time_since > REQUEST_TIMEOUT) {
164	log_error_doc(current);
165	fputs("connection timed out\n", stderr);
166	current->status = DEAD;
167	}
168	if (current->buffer_end && current->status < DEAD) {
169	if (FD_ISSET(current->fd, &params->block_write_fdset))
170	ready_request( params, current);
171	else {
172	BOA_FD_SET(current->fd, &params->block_write_fdset);
173	}
174	} else {
175	switch (current->status) {
176	case WRITE:
177	case PIPE_WRITE:
178	if (FD_ISSET(current->fd, &params->block_write_fdset))
179	ready_request( params, current);
180	else {
181	BOA_FD_SET(current->fd, &params->block_write_fdset);
182	}
183	break;
184	case BODY_WRITE:
185	if (FD_ISSET(current->post_data_fd, &params->block_write_fdset))
186	ready_request( params, current);
187	else {
188	BOA_FD_SET(current->post_data_fd, &params->block_write_fdset);
189	}
190	break;
191	case PIPE_READ:
192	if (FD_ISSET(current->data_fd, &params->block_read_fdset))
193	ready_request( params, current);
194	else {
195	BOA_FD_SET(current->data_fd, &params->block_read_fdset);
196	}
197	break;
198	case DONE:
199	if (FD_ISSET(current->fd, &params->block_write_fdset))
200	ready_request( params, current);
201	else {
202	BOA_FD_SET(current->fd, &params->block_write_fdset);
203	}
204	break;
205	case DEAD:
206	ready_request( params, current);
207	break;
208	default:
209	if (FD_ISSET(current->fd, &params->block_read_fdset))
210	ready_request( params, current);
211	else {
212	BOA_FD_SET(current->fd, &params->block_read_fdset);
213	}
214	break;
215	}
216	}
217	current = next;
218	}
219	}
220