1/*
2 * EAP server method registration
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "eap_i.h"
13#include "eap_methods.h"
14
15
16static struct eap_method *eap_methods;
17
18
19/**
20 * eap_server_get_eap_method - Get EAP method based on type number
21 * @vendor: EAP Vendor-Id (0 = IETF)
22 * @method: EAP type number
23 * Returns: Pointer to EAP method or %NULL if not found
24 */
25const struct eap_method * eap_server_get_eap_method(int vendor,
26						    enum eap_type method)
27{
28	struct eap_method *m;
29	for (m = eap_methods; m; m = m->next) {
30		if (m->vendor == vendor && m->method == method)
31			return m;
32	}
33	return NULL;
34}
35
36
37/**
38 * eap_server_get_type - Get EAP type for the given EAP method name
39 * @name: EAP method name, e.g., TLS
40 * @vendor: Buffer for returning EAP Vendor-Id
41 * Returns: EAP method type or %EAP_TYPE_NONE if not found
42 *
43 * This function maps EAP type names into EAP type numbers based on the list of
44 * EAP methods included in the build.
45 */
46enum eap_type eap_server_get_type(const char *name, int *vendor)
47{
48	struct eap_method *m;
49	for (m = eap_methods; m; m = m->next) {
50		if (os_strcmp(m->name, name) == 0) {
51			*vendor = m->vendor;
52			return m->method;
53		}
54	}
55	*vendor = EAP_VENDOR_IETF;
56	return EAP_TYPE_NONE;
57}
58
59
60/**
61 * eap_server_method_alloc - Allocate EAP server method structure
62 * @version: Version of the EAP server method interface (set to
63 * EAP_SERVER_METHOD_INTERFACE_VERSION)
64 * @vendor: EAP Vendor-ID (EAP_VENDOR_*) (0 = IETF)
65 * @method: EAP type number (EAP_TYPE_*)
66 * @name: Name of the method (e.g., "TLS")
67 * Returns: Allocated EAP method structure or %NULL on failure
68 *
69 * The returned structure should be freed with eap_server_method_free() when it
70 * is not needed anymore.
71 */
72struct eap_method * eap_server_method_alloc(int version, int vendor,
73					    enum eap_type method,
74					    const char *name)
75{
76	struct eap_method *eap;
77	eap = os_zalloc(sizeof(*eap));
78	if (eap == NULL)
79		return NULL;
80	eap->version = version;
81	eap->vendor = vendor;
82	eap->method = method;
83	eap->name = name;
84	return eap;
85}
86
87
88/**
89 * eap_server_method_free - Free EAP server method structure
90 * @method: Method structure allocated with eap_server_method_alloc()
91 */
92static void eap_server_method_free(struct eap_method *method)
93{
94	os_free(method);
95}
96
97
98/**
99 * eap_server_method_register - Register an EAP server method
100 * @method: EAP method to register from eap_server_method_alloc()
101 * Returns: 0 on success, -1 on invalid method, or -2 if a matching EAP method
102 * has already been registered
103 *
104 * Each EAP server method needs to call this function to register itself as a
105 * supported EAP method. The caller must not free the allocated method data
106 * regardless of the return value.
107 */
108int eap_server_method_register(struct eap_method *method)
109{
110	struct eap_method *m, *last = NULL;
111
112	if (method == NULL || method->name == NULL ||
113	    method->version != EAP_SERVER_METHOD_INTERFACE_VERSION) {
114		eap_server_method_free(method);
115		return -1;
116	}
117
118	for (m = eap_methods; m; m = m->next) {
119		if ((m->vendor == method->vendor &&
120		     m->method == method->method) ||
121		    os_strcmp(m->name, method->name) == 0) {
122			eap_server_method_free(method);
123			return -2;
124		}
125		last = m;
126	}
127
128	if (last)
129		last->next = method;
130	else
131		eap_methods = method;
132
133	return 0;
134}
135
136
137/**
138 * eap_server_unregister_methods - Unregister EAP server methods
139 *
140 * This function is called at program termination to unregister all EAP server
141 * methods.
142 */
143void eap_server_unregister_methods(void)
144{
145	struct eap_method *m;
146
147	while (eap_methods) {
148		m = eap_methods;
149		eap_methods = eap_methods->next;
150
151		if (m->free)
152			m->free(m);
153		else
154			eap_server_method_free(m);
155	}
156}
157
158
159/**
160 * eap_server_get_name - Get EAP method name for the given EAP type
161 * @vendor: EAP Vendor-Id (0 = IETF)
162 * @type: EAP method type
163 * Returns: EAP method name, e.g., TLS, or "unknown" if not found
164 *
165 * This function maps EAP type numbers into EAP type names based on the list of
166 * EAP methods included in the build.
167 */
168const char * eap_server_get_name(int vendor, enum eap_type type)
169{
170	struct eap_method *m;
171	if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_EXPANDED)
172		return "expanded";
173	for (m = eap_methods; m; m = m->next) {
174		if (m->vendor == vendor && m->method == type)
175			return m->name;
176	}
177	return "unknown";
178}
179