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 |
|
52 |
void *hic_main_loop(void *_hic_params) |
53 |
{ |
54 |
hic_request* current, *next; |
55 |
hic_params *params = _hic_params; |
56 |
|
57 |
while (1) { |
58 |
for (current = params->request_head;current;current=next) { |
59 |
|
60 |
#ifdef ENABLE_SMP |
61 |
pthread_mutex_lock(¶ms->lock); |
62 |
#endif |
63 |
next = current->next; |
64 |
#ifdef ENABLE_SMP |
65 |
pthread_mutex_unlock(¶ms->lock); |
66 |
#endif |
67 |
|
68 |
if (process_hic_request( params, current) == -1) { |
69 |
log_error_time(); |
70 |
fprintf(stderr, "hic: Error while processing command.\n"); |
71 |
exit(1); |
72 |
} |
73 |
} |
74 |
|
75 |
/* If somebody sends a command, then he should |
76 |
* send a sigusr2 as well. |
77 |
*/ |
78 |
unblock_sigusr2(); |
79 |
if (!params->request_head) pause(); |
80 |
block_sigusr2(); |
81 |
|
82 |
if (params->sigchld_flag) |
83 |
sigchld_run(); |
84 |
if (params->sighup_flag) |
85 |
sighup_run(); |
86 |
|
87 |
|
88 |
} |
89 |
|
90 |
} |
91 |
|
92 |
static int process_hic_request(hic_params* params, hic_request * req) |
93 |
{ |
94 |
hic_module_st *hst; |
95 |
hic_stuff* cmd = &req->command; |
96 |
|
97 |
#ifdef ENABLE_SMP |
98 |
pthread_mutex_lock(¶ms->lock); |
99 |
#endif |
100 |
hic_dequeue( ¶ms->request_head, req); |
101 |
#ifdef ENABLE_SMP |
102 |
pthread_mutex_unlock(¶ms->lock); |
103 |
#endif |
104 |
|
105 |
hst = find_hic_appr_module(get_mime_type(cmd->path_translated), 0); |
106 |
if (hst == NULL) { |
107 |
log_error_time(); |
108 |
fprintf(stderr, "Could not find HIC handler for '%s'\n", |
109 |
cmd->path_translated); |
110 |
close(cmd->out_fd); |
111 |
free( req); |
112 |
return 0; |
113 |
} |
114 |
|
115 |
hst->request(cmd); |
116 |
close(cmd->out_fd); |
117 |
|
118 |
/* |
119 |
log_error_time(); |
120 |
fprintf(stderr, "HIC status: %d wrote: %d\n", cmd->status, cmd->bytes_sent); |
121 |
*/ |
122 |
|
123 |
free( req); |
124 |
|
125 |
return 0; |
126 |
} |
127 |
|
128 |
#ifdef ENABLE_SMP |
129 |
/* We use this index, to send messages to different |
130 |
* HIC thread every time. |
131 |
*/ |
132 |
static pthread_mutex_t hic_index_lock = PTHREAD_MUTEX_INITIALIZER; |
133 |
static int hic_index; |
134 |
#endif |
135 |
|
136 |
/* Sends a command to a HIC thread. |
137 |
*/ |
138 |
int hic_send_command(request * req, int out_fd) |
139 |
{ |
140 |
hic_request *x; |
141 |
hic_params *params; |
142 |
|
143 |
if (global_hic_params_size == 0) /* hic is disabled */ |
144 |
return -1; |
145 |
|
146 |
/* choose a random hic thread */ |
147 |
if (global_hic_params_size > 1) { |
148 |
#ifdef ENABLE_SMP |
149 |
pthread_mutex_lock( &hic_index_lock); |
150 |
#endif |
151 |
params = &global_hic_params[ hic_index]; |
152 |
hic_index++; |
153 |
hic_index %= global_hic_params_size; |
154 |
#ifdef ENABLE_SMP |
155 |
pthread_mutex_unlock( &hic_index_lock); |
156 |
#endif |
157 |
} else { |
158 |
params = &global_hic_params[0]; |
159 |
} |
160 |
|
161 |
x = malloc( sizeof( hic_request)); |
162 |
if (x==NULL) |
163 |
return -1; |
164 |
|
165 |
x->next = x->prev = NULL; |
166 |
x->command.cgi_env = req->cgi_env; |
167 |
x->command.http_version = req->http_version; |
168 |
x->command.post_data_fd = req->post_data_fd.fds[0]; |
169 |
x->command.out_fd = out_fd; |
170 |
x->command.path_translated = req->path_translated; |
171 |
|
172 |
#ifdef ENABLE_SMP |
173 |
pthread_mutex_lock(¶ms->lock); |
174 |
#endif |
175 |
|
176 |
hic_enqueue( ¶ms->request_head, x); |
177 |
#ifdef ENABLE_SMP |
178 |
/* Notify the HIC thread about the pending request |
179 |
*/ |
180 |
pthread_kill( params->tid, SIGUSR2); |
181 |
#endif |
182 |
|
183 |
#ifdef ENABLE_SMP |
184 |
pthread_mutex_unlock(¶ms->lock); |
185 |
#endif |
186 |
|
187 |
return 1; |
188 |
|
189 |
} |
190 |
|
191 |
/* Implement a basic queue for HIC stuff. This is created after |
192 |
* queue.c. |
193 |
*/ |
194 |
|
195 |
#include "queue.h" |
196 |
|
197 |
ENQUEUE_FUNCTION( hic_enqueue, hic_request) |
198 |
DEQUEUE_FUNCTION( hic_dequeue, hic_request) |
199 |
|
200 |
#endif /* ENABLE_HIC */ |