1 |
/* |
2 |
* Copyright (C) 2002 Nikos Mavroyanopoulos |
3 |
* |
4 |
* This file is part of BOA webserver. |
5 |
* |
6 |
* Hydra is free software; you can redistribute it and/or modify |
7 |
* it under the terms of the GNU General Public License as published by |
8 |
* the Free Software Foundation; either version 2 of the License, or |
9 |
* (at your option) any later version. |
10 |
* |
11 |
* Hydra is distributed in the hope that it will be useful, |
12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
* GNU General Public License for more details. |
15 |
* |
16 |
* You should have received a copy of the GNU General Public License |
17 |
* along with this program; if not, write to the Free Software |
18 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
19 |
*/ |
20 |
|
21 |
#include "boa.h" |
22 |
#include <signal.h> /* signal */ |
23 |
|
24 |
/* Hydra Internally handled CGIs (HIC HIC) |
25 |
* |
26 |
* How does it work? |
27 |
* |
28 |
* A special thread (maybe more than one), is used for CGIs. This tread |
29 |
* uses one pipe to communicate with the others via hic_send_command(). |
30 |
* |
31 |
* If a request for a HIC file arrives, the server goes as a normal CGI |
32 |
* creates a pipe, but does not fork. It enqueues a hic_request |
33 |
* for this (HIC) thread, and sends a SIGUSR2 signal. The HIC thread is then |
34 |
* waken up, and handles all pending requests. |
35 |
* |
36 |
* The HIC thread, when receives the message, parses the CGIs, |
37 |
* one CGI at the time, and sends the output to fd. |
38 |
* |
39 |
* The benefit is that in no case the server is blocked. We may have |
40 |
* a performance problem, if the server only uses parsed CGIs. |
41 |
* |
42 |
*/ |
43 |
|
44 |
#ifdef ENABLE_HIC |
45 |
|
46 |
#include "hic.h" |
47 |
|
48 |
static int process_hic_request(hic_params*, hic_request * cmd); |
49 |
void hic_dequeue(hic_request ** head, hic_request * req); |
50 |
void hic_enqueue(hic_request ** head, hic_request * req); |
51 |
int hic_sigchld_flag = 0; /* if we received a SIGCHLD signal, then this flag |
52 |
* is non zero */ |
53 |
|
54 |
void *hic_main_loop(void *_hic_params) |
55 |
{ |
56 |
hic_request* current, *next; |
57 |
hic_params *params = _hic_params; |
58 |
|
59 |
#ifdef ENABLE_SMP |
60 |
pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL); |
61 |
pthread_setcanceltype( PTHREAD_CANCEL_ASYNCHRONOUS, NULL); |
62 |
#endif |
63 |
|
64 |
while (1) { |
65 |
for (current = params->request_head;current;current=next) { |
66 |
|
67 |
#ifdef ENABLE_SMP |
68 |
pthread_mutex_lock(¶ms->lock); |
69 |
#endif |
70 |
next = current->next; |
71 |
#ifdef ENABLE_SMP |
72 |
pthread_mutex_unlock(¶ms->lock); |
73 |
#endif |
74 |
|
75 |
if (process_hic_request( params, current) == -1) { |
76 |
log_error_time(); |
77 |
fprintf(stderr, "hic: Error while processing command.\n"); |
78 |
exit(1); |
79 |
} |
80 |
} |
81 |
|
82 |
/* If somebody sends a command, then he should |
83 |
* send a sigusr2 as well. |
84 |
*/ |
85 |
unblock_sigusr2(); |
86 |
if (!params->request_head) pause(); |
87 |
block_sigusr2(); |
88 |
|
89 |
if (params->sigchld_flag) |
90 |
sigchld_run(); |
91 |
|
92 |
|
93 |
} |
94 |
|
95 |
} |
96 |
|
97 |
static int process_hic_request(hic_params* params, hic_request * req) |
98 |
{ |
99 |
hic_module_st *hst; |
100 |
hic_stuff* cmd = &req->command; |
101 |
|
102 |
#ifdef ENABLE_SMP |
103 |
pthread_mutex_lock(¶ms->lock); |
104 |
#endif |
105 |
hic_dequeue( ¶ms->request_head, req); |
106 |
#ifdef ENABLE_SMP |
107 |
pthread_mutex_unlock(¶ms->lock); |
108 |
#endif |
109 |
|
110 |
hst = find_hic_appr_module(get_mime_type(cmd->path_translated), 0); |
111 |
if (hst == NULL) { |
112 |
log_error_time(); |
113 |
fprintf(stderr, "Could not find HIC handler for '%s'\n", |
114 |
cmd->path_translated); |
115 |
close(cmd->out_fd); |
116 |
free( req); |
117 |
return 0; |
118 |
} |
119 |
|
120 |
hst->request(cmd); |
121 |
close(cmd->out_fd); |
122 |
free( req); |
123 |
|
124 |
/* |
125 |
log_error_time(); |
126 |
fprintf(stderr, "HIC status: %d wrote: %d\n", cmd->status, cmd->bytes_sent); |
127 |
*/ |
128 |
|
129 |
return 0; |
130 |
} |
131 |
|
132 |
#ifdef ENABLE_SMP |
133 |
/* We use this index, to send messages to different |
134 |
* HIC thread every time. |
135 |
*/ |
136 |
static pthread_mutex_t index_lock = PTHREAD_MUTEX_INITIALIZER; |
137 |
static int index; |
138 |
#endif |
139 |
|
140 |
/* Sends a command to a HIC thread. |
141 |
*/ |
142 |
int hic_send_command(request * req, int out_fd) |
143 |
{ |
144 |
hic_request *x; |
145 |
hic_params *params; |
146 |
|
147 |
/* choose a random hic thread */ |
148 |
if (global_hic_params_size > 1) { |
149 |
#ifdef ENABLE_SMP |
150 |
pthread_mutex_lock( &index_lock); |
151 |
#endif |
152 |
params = &global_hic_params[ index]; |
153 |
index++; |
154 |
index %= global_hic_params_size; |
155 |
#ifdef ENABLE_SMP |
156 |
pthread_mutex_unlock( &index_lock); |
157 |
#endif |
158 |
} else { |
159 |
params = &global_hic_params[0]; |
160 |
} |
161 |
|
162 |
x = malloc( sizeof( hic_request)); |
163 |
if (x==NULL) |
164 |
return -1; |
165 |
|
166 |
x->next = x->prev = NULL; |
167 |
x->command.cgi_env = req->cgi_env; |
168 |
x->command.cgi_env_max = req->cgi_env_index; |
169 |
x->command.one_one = 0; |
170 |
x->command.post_data_fd = req->post_data_fd; |
171 |
x->command.out_fd = out_fd; |
172 |
x->command.request_uri = req->request_uri; |
173 |
x->command.path_translated = req->path_translated; |
174 |
|
175 |
if (!req->secure) |
176 |
x->command.server_version = boa_version; |
177 |
else |
178 |
x->command.server_version = boa_tls_version; |
179 |
|
180 |
#ifdef ENABLE_SMP |
181 |
pthread_mutex_lock(¶ms->lock); |
182 |
#endif |
183 |
|
184 |
hic_enqueue( ¶ms->request_head, x); |
185 |
#ifdef ENABLE_SMP |
186 |
/* Notify the HIC thread about the pending request |
187 |
*/ |
188 |
pthread_kill( params->tid, SIGUSR2); |
189 |
#endif |
190 |
|
191 |
#ifdef ENABLE_SMP |
192 |
pthread_mutex_unlock(¶ms->lock); |
193 |
#endif |
194 |
|
195 |
return 1; |
196 |
|
197 |
} |
198 |
|
199 |
/* Implement a basic queue for HIC stuff. This is created after |
200 |
* queue.c. |
201 |
*/ |
202 |
|
203 |
#include "queue.h" |
204 |
|
205 |
ENQUEUE_FUNCTION( hic_enqueue, hic_request) |
206 |
DEQUEUE_FUNCTION( hic_dequeue, hic_request) |
207 |
|
208 |
#endif /* ENABLE_HIC */ |