radius: implemented default-realm option

accel-pppd/accel-ppp.conf.5

@@ -486,6 +486,10 @@ Specifies timeout of accounting interim update.
 .TP
 .BI "acct-delay-time=" 0|1
 Specifies whether radius client should include Acct-Delay-Time attribute to accounting requests (default 0).
+.TP
+.BI "default-realme=" realm
+Append specified realm to username.
+.TP
 .SH [log]
 .br
 Configuration of log and log_file modules.

accel-pppd/radius/radius.c

@@ -42,6 +42,9 @@ int conf_accounting;
 int conf_fail_time;
 int conf_req_limit;
 
+static const char *conf_default_realm;
+static int conf_default_realm_len;
+
 static LIST_HEAD(sessions);
 static pthread_rwlock_t sessions_lock = PTHREAD_RWLOCK_INITIALIZER;
 
@@ -149,12 +152,27 @@ int rad_proc_attrs(struct rad_req_t *req)
 	return res;
 }
 
-static int check(struct pwdb_t *pwdb, struct ap_session *ses, const char *username, int type, va_list _args)
+static int rad_pwdb_check(struct pwdb_t *pwdb, struct ap_session *ses, const char *username, int type, va_list _args)
 {
 	int r = PWDB_NO_IMPL;
 	va_list args;
 	int chap_type;
 	struct radius_pd_t *rpd = find_pd(ses);
+	char username1[256];
+
+	if (conf_default_realm && !strchr(username, '@')) {
+		int len = strlen(username);
+		if (len + conf_default_realm_len >= 256 - 2) {
+			log_ppp_error("radius: username is too large to append realm\n");
+			return PWDB_DENIED;
+		}
+		
+		memcpy(username1, username, len);
+		username1[len] = '@';
+		memcpy(username1 + len + 1, conf_default_realm, conf_default_realm_len);
+		username1[len + 1 + conf_default_realm_len] = 0;
+		username = username1;
+	}
 
 	va_copy(args, _args);
 
@@ -488,7 +506,7 @@ static struct ipdb_t ipdb = {
 };
 
 static struct pwdb_t pwdb = {
-	.check = check,
+	.check = rad_pwdb_check,
 };
 
 static int parse_server(const char *opt, in_addr_t *addr, int *port, char **secret)
@@ -600,6 +618,10 @@ static int load_config(void)
 	opt = conf_get_opt("radius", "req-limit");
 	if (opt)
 		conf_req_limit = atoi(opt);
+	
+	conf_default_realm = conf_get_opt("radius", "default-realm");
+	if (conf_default_realm)
+		conf_default_realm_len = strlen(conf_default_realm);
 
 	return 0;
 }