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 1.2 2002/09/23 17:56:41 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) {

        if (params->sigchld_flag)
            sigchld_run();

#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->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 1.2 2002/09/23 17:56:41 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
60	if (params->sigchld_flag)
61	sigchld_run();
62
63	#ifdef ENABLE_SMP
64	/* Only the main thread handles signals.
65	*/
66	if (pthread_equal( params->tid, father_id)) {
67	#endif
68	if (params->sighup_flag)
69	sighup_run();
70	if (params->sigalrm_flag)
71	sigalrm_run();
72	if (params->sigusr1_flag)
73	sigusr1_run();
74	if (params->sigterm_flag) {
75	if (params->sigterm_flag == 1) {
76	sigterm_stage1_run();
77	}
78	if (params->sigterm_flag == 2 && !params->request_ready && !params->request_block) {
79	sigterm_stage2_run();
80	}
81	}
82	#ifdef ENABLE_SMP
83	}
84	#endif
85
86	/* reset max_fd */
87	params->max_fd = -1;
88
89	if (params->request_block)
90	/* move selected req's from request_block to request_ready */
91	fdset_update( params);
92
93	/* any blocked req's move from request_ready to request_block */
94	if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
95	#ifdef ENABLE_SSL
96	if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
97	#endif
98
99	if (!params->sigterm_flag && params->total_connections < (max_connections - 10)) {
100	if (params->server_s[0].socket != -1) BOA_FD_SET(params->server_s[0].socket, &params->block_read_fdset); /* server always set */
101	#ifdef ENABLE_SSL
102	if (params->server_s[1].socket != -1) BOA_FD_SET(params->server_s[1].socket, &params->block_read_fdset); /* server always set */
103	#endif
104	}
105
106	params->req_timeout.tv_sec = ((params->request_ready) ? 0 :
107	(ka_timeout ? ka_timeout : REQUEST_TIMEOUT));
108	params->req_timeout.tv_usec = 0l; /* reset timeout */
109
110	if (select(params->max_fd + 1, &params->block_read_fdset,
111	&params->block_write_fdset, NULL,
112	((params->request_ready \|\| params->request_block) ? &params->req_timeout : NULL)) == -1) {
113	/* what is the appropriate thing to do here on EBADF */
114	if (errno == EINTR)
115	continue; /* while(1) */
116	else if (errno != EBADF) {
117	DIE("select");
118	}
119	}
120
121	time(&current_time);
122	if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
123	params->server_s[0].pending_requests = 1;
124	#ifdef ENABLE_SSL
125	if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
126	params->server_s[1].pending_requests = 1;
127	#endif
128	}
129
130	return NULL;
131	}
132
133	/*
134	* Name: fdset_update
135	*
136	* Description: iterate through the blocked requests, checking whether
137	* that file descriptor has been set by select. Update the fd_set to
138	* reflect current status.
139	*
140	* Here, we need to do some things:
141	* - keepalive timeouts simply close
142	* (this is special:: a keepalive timeout is a timeout where
143	keepalive is active but nothing has been read yet)
144	* - regular timeouts close + error
145	* - stuff in buffer and fd ready? write it out
146	* - fd ready for other actions? do them
147	*/
148
149	static void fdset_update( server_params* params)
150	{
151	request current, next;
152
153	for(current = params->request_block;current;current = next) {
154	time_t time_since = current_time - current->time_last;
155	next = current->next;
156
157	/* hmm, what if we are in "the middle" of a request and not
158	* just waiting for a new one... perhaps check to see if anything
159	* has been read via header position, etc... */
160	if (current->kacount < ka_max && /* we are in a keepalive */
161	(time_since >= ka_timeout) && /* ka timeout */
162	!current->logline) /* haven't read anything yet */
163	current->status = DEAD; /* connection keepalive timed out */
164	else if (time_since > REQUEST_TIMEOUT) {
165	log_error_doc(current);
166	fputs("connection timed out\n", stderr);
167	current->status = DEAD;
168	}
169	if (current->buffer_end && current->status < DEAD) {
170	if (FD_ISSET(current->fd, &params->block_write_fdset))
171	ready_request( params, current);
172	else {
173	BOA_FD_SET(current->fd, &params->block_write_fdset);
174	}
175	} else {
176	switch (current->status) {
177	case WRITE:
178	case PIPE_WRITE:
179	if (FD_ISSET(current->fd, &params->block_write_fdset))
180	ready_request( params, current);
181	else {
182	BOA_FD_SET(current->fd, &params->block_write_fdset);
183	}
184	break;
185	case BODY_WRITE:
186	if (FD_ISSET(current->post_data_fd, &params->block_write_fdset))
187	ready_request( params, current);
188	else {
189	BOA_FD_SET(current->post_data_fd, &params->block_write_fdset);
190	}
191	break;
192	case PIPE_READ:
193	if (FD_ISSET(current->data_fd, &params->block_read_fdset))
194	ready_request( params, current);
195	else {
196	BOA_FD_SET(current->data_fd, &params->block_read_fdset);
197	}
198	break;
199	case DONE:
200	if (FD_ISSET(current->fd, &params->block_write_fdset))
201	ready_request( params, current);
202	else {
203	BOA_FD_SET(current->fd, &params->block_write_fdset);
204	}
205	break;
206	case DEAD:
207	ready_request( params, current);
208	break;
209	default:
210	if (FD_ISSET(current->fd, &params->block_read_fdset))
211	ready_request( params, current);
212	else {
213	BOA_FD_SET(current->fd, &params->block_read_fdset);
214	}
215	break;
216	}
217	}
218	current = next;
219	}
220	}
221