6 * This program 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.
11 * This program 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.
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
20 * Copyright 2000 The FreeRADIUS server project
21 * Copyright 2000 your name <your address>
25 #include "libradius.h"
34 static const char rcsid[] = "$Id$";
37 * Define a structure for our module configuration.
39 * These variables do not need to be in a structure, but it's
40 * a lot cleaner to do so, and a pointer to the structure can
41 * be used as the instance handle.
43 typedef struct rlm_example_t {
51 * A mapping of configuration file names to internal variables.
53 * Note that the string is dynamically allocated, so it MUST
54 * be freed. When the configuration file parse re-reads the string,
55 * it free's the old one, and strdup's the new one, placing the pointer
56 * to the strdup'd string into 'config.string'. This gets around
59 static CONF_PARSER module_config[] = {
60 { "integer", PW_TYPE_INTEGER, offsetof(rlm_example_t,value), NULL, "1" },
61 { "boolean", PW_TYPE_BOOLEAN, offsetof(rlm_example_t,boolean), NULL, "no"},
62 { "string", PW_TYPE_STRING_PTR, offsetof(rlm_example_t,string), NULL, NULL},
63 { "ipaddr", PW_TYPE_IPADDR, offsetof(rlm_example_t,ipaddr), NULL, "*" },
65 { NULL, -1, 0, NULL, NULL } /* end the list */
69 * Do any per-module initialization. e.g. set up connections
70 * to external databases, read configuration files, set up
71 * dictionary entries, etc.
73 * Try to avoid putting too much stuff in here - it's better to
74 * do it in instantiate() where it is not global.
76 static int example_init(void)
79 * Everything's OK, return without an error.
85 * Do any per-module initialization that is separate to each
86 * configured instance of the module. e.g. set up connections
87 * to external databases, read configuration files, set up
88 * dictionary entries, etc.
90 * If configuration information is given in the config section
91 * that must be referenced in later calls, store a handle to it
92 * in *instance otherwise put a null pointer there.
94 static int example_instantiate(CONF_SECTION *conf, void **instance)
99 * Set up a storage area for instance data
101 data = rad_malloc(sizeof(*data));
104 * If the configuration parameters can't be parsed, then
107 if (cf_section_parse(conf, data, module_config) < 0) {
118 * Find the named user in this modules database. Create the set
119 * of attribute-value pairs to check and reply with for this user
120 * from the database. The authentication code only needs to check
121 * the password, the rest is done here.
123 static int example_authorize(void *instance, REQUEST *request)
128 /* quiet the compiler */
133 * Look for the 'state' attribute.
135 state = pairfind(request->packet->vps, PW_STATE);
137 DEBUG("rlm_example: Found reply to access challenge");
138 return RLM_MODULE_OK;
142 * Create the challenge, and add it to the reply.
144 reply = pairmake("Reply-Message", "This is a challenge", T_OP_EQ);
145 pairadd(&request->reply->vps, reply);
146 state = pairmake("State", "0", T_OP_EQ);
147 pairadd(&request->reply->vps, state);
150 * Mark the packet as an Access-Challenge packet.
152 * The server will take care of sending it to the user.
154 request->reply->code = PW_ACCESS_CHALLENGE;
155 DEBUG("rlm_example: Sending Access-Challenge.");
157 return RLM_MODULE_HANDLED;
161 * Authenticate the user with the given password.
163 static int example_authenticate(void *instance, REQUEST *request)
165 /* quiet the compiler */
169 return RLM_MODULE_OK;
173 * Massage the request before recording it or proxying it
175 static int example_preacct(void *instance, REQUEST *request)
177 /* quiet the compiler */
181 return RLM_MODULE_OK;
185 * Write accounting information to this modules database.
187 static int example_accounting(void *instance, REQUEST *request)
189 /* quiet the compiler */
193 return RLM_MODULE_OK;
197 * See if a user is already logged in. Sets request->simul_count to the
198 * current session count for this user and sets request->simul_mpp to 2
199 * if it looks like a multilink attempt based on the requested IP
200 * address, otherwise leaves request->simul_mpp alone.
202 * Check twice. If on the first pass the user exceeds his
203 * max. number of logins, do a second pass and validate all
204 * logins by querying the terminal server (using eg. SNMP).
206 static int example_checksimul(void *instance, REQUEST *request)
210 request->simul_count=0;
212 return RLM_MODULE_OK;
215 static int example_detach(void *instance)
217 free(((struct rlm_example_t *)instance)->string);
223 * The module name should be the only globally exported symbol.
224 * That is, everything else should be 'static'.
226 * If the module needs to temporarily modify it's instantiation
227 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
228 * The server will then take care of ensuring that the module
229 * is single-threaded.
231 module_t rlm_example = {
233 RLM_TYPE_THREAD_SAFE, /* type */
234 example_init, /* initialization */
235 example_instantiate, /* instantiation */
236 example_authorize, /* authorization */
237 example_authenticate, /* authentication */
238 example_preacct, /* preaccounting */
239 example_accounting, /* accounting */
240 example_checksimul, /* checksimul */
241 example_detach, /* detach */