summaryrefslogtreecommitdiffstats
path: root/rubbos/app/httpd-2.0.64/modules/metadata/mod_env.c
blob: 9ce1ccbc3dc04c8605b354a24f3e5e119e2fc7e4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "apr.h"
#include "apr_strings.h"

#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_log.h"

typedef struct {
    apr_table_t *vars;
    apr_table_t *unsetenv;
} env_dir_config_rec;

module AP_MODULE_DECLARE_DATA env_module;

static void *create_env_dir_config(apr_pool_t *p, char *dummy)
{
    env_dir_config_rec *conf = apr_palloc(p, sizeof(*conf));

    conf->vars = apr_table_make(p, 10);
    conf->unsetenv = apr_table_make(p, 10);

    return conf;
}

static void *merge_env_dir_configs(apr_pool_t *p, void *basev, void *addv)
{
    env_dir_config_rec *base = basev;
    env_dir_config_rec *add = addv;
    env_dir_config_rec *res = apr_palloc(p, sizeof(*res));

    const apr_table_entry_t *elts;
    const apr_array_header_t *arr;

    int i;

    /* 
     * res->vars = copy_table( p, base->vars );
     * foreach $unsetenv ( @add->unsetenv )
     *     table_unset( res->vars, $unsetenv );
     * foreach $element ( @add->vars )
     *     table_set( res->vars, $element.key, $element.val );
     *
     * add->unsetenv already removed the vars from add->vars, 
     * if they preceeded the UnsetEnv directive.
     */
    res->vars = apr_table_copy(p, base->vars);
    res->unsetenv = NULL;

    arr = apr_table_elts(add->unsetenv);
    if (arr) {
        elts = (const apr_table_entry_t *)arr->elts;

        for (i = 0; i < arr->nelts; ++i) {
            apr_table_unset(res->vars, elts[i].key);
        }
    }

    arr = apr_table_elts(add->vars);
    if (arr) {
        elts = (const apr_table_entry_t *)arr->elts;

        for (i = 0; i < arr->nelts; ++i) {
            apr_table_setn(res->vars, elts[i].key, elts[i].val);
        }
    }

    return res;
}

static const char *add_env_module_vars_passed(cmd_parms *cmd, void *sconf_,
                                              const char *arg)
{
    env_dir_config_rec *sconf = sconf_;
    apr_table_t *vars = sconf->vars;
    const char *env_var;
    
    env_var = getenv(arg);
    if (env_var != NULL) {
        apr_table_setn(vars, arg, apr_pstrdup(cmd->pool, env_var));
    }
    else {
        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, cmd->server,
                     "PassEnv variable %s was undefined", arg);
    }

    return NULL;
}

static const char *add_env_module_vars_set(cmd_parms *cmd, void *sconf_,
                                           const char *name, const char *value)
{
    env_dir_config_rec *sconf = sconf_;
    
    /* name is mandatory, value is optional.  no value means
     * set the variable to an empty string
     */
    apr_table_setn(sconf->vars, name, value ? value : "");

    return NULL;
}

static const char *add_env_module_vars_unset(cmd_parms *cmd, void *sconf_,
                                             const char *arg)
{
    env_dir_config_rec *sconf = sconf_;

    /* Always UnsetEnv FOO in the same context as {Set,Pass}Env FOO
     * only if this UnsetEnv follows the {Set,Pass}Env.  The merge
     * will only apply unsetenv to the parent env (main server).
     */
    apr_table_set(sconf->unsetenv, arg, NULL);
    apr_table_unset(sconf->vars, arg);

    return NULL;
}

static const command_rec env_module_cmds[] =
{
AP_INIT_ITERATE("PassEnv", add_env_module_vars_passed, NULL,
     OR_FILEINFO, "a list of environment variables to pass to CGI."),
AP_INIT_TAKE12("SetEnv", add_env_module_vars_set, NULL,
     OR_FILEINFO, "an environment variable name and optional value to pass to CGI."),
AP_INIT_ITERATE("UnsetEnv", add_env_module_vars_unset, NULL,
     OR_FILEINFO, "a list of variables to remove from the CGI environment."),
    {NULL},
};

static int fixup_env_module(request_rec *r)
{
    apr_table_t *e = r->subprocess_env;
    env_dir_config_rec *sconf = ap_get_module_config(r->per_dir_config,
                                                     &env_module);
    apr_table_t *vars = sconf->vars;

    if (!apr_table_elts(sconf->vars)->nelts)
        return DECLINED;

    r->subprocess_env = apr_table_overlay(r->pool, e, vars);

    return OK;
}

static void register_hooks(apr_pool_t *p)
{
    ap_hook_fixups(fixup_env_module, NULL, NULL, APR_HOOK_MIDDLE);
}

module AP_MODULE_DECLARE_DATA env_module =
{
    STANDARD20_MODULE_STUFF,
    create_env_dir_config,      /* dir config creater */
    merge_env_dir_configs,      /* dir merger --- default is to override */
    NULL,                       /* server config */
    NULL,                       /* merge server configs */
    env_module_cmds,            /* command apr_table_t */
    register_hooks              /* register hooks */
};