radius: use NAS-Port-Id in Access-Accept for interface renaming

accel-pppd/ifcfg.c

@@ -230,3 +230,28 @@ void __export ap_session_ifdown(struct ap_session *ses)
 	}
 }
 
+void __export ap_session_rename(struct ap_session *ses, const char *ifname, int len)
+{
+	struct ifreq ifr;
+
+	if (len == -1)
+		len = strlen(ifname);
+	
+	if (len >= IFNAMSIZ - 1) {
+		log_ppp_warn("cannot rename interface (name it too long)\n");
+		return;
+	}
+
+	ifr.ifr_ifindex = ses->ifindex;
+	strcpy(ifr.ifr_name, ses->ifname);
+	memcpy(ifr.ifr_newname, ifname, len);
+	ifr.ifr_newname[len] = 0;
+
+	if (ioctl(sock_fd, SIOCSIFNAME, &ifr))
+		log_ppp_warn("interface rename failed: %s\n", strerror(errno));
+	else {
+		memcpy(ses->ifname, ifname, len);
+		ses->ifname[len] = 0;
+	}
+}
+

accel-pppd/include/ap_session.h

@@ -128,6 +128,7 @@ int ap_session_check_single(const char *username);
 
 void ap_session_ifup(struct ap_session *ses);
 void ap_session_ifdown(struct ap_session *ses);
+void ap_session_rename(struct ap_session *ses, const char *ifname, int len);
 
 int ap_session_read_stats(struct ap_session *ses, struct rtnl_link_stats *stats);
 

accel-pppd/radius/radius.c

@@ -142,11 +142,15 @@ int rad_proc_attrs(struct rad_req_t *req)
 				a->addr = attr->val.ipv6prefix.prefix;
 				list_add_tail(&a->entry, &req->rpd->ipv6_dp.prefix_list);
 				break;
+			case NAS_Port_Id:
+				ap_session_rename(req->rpd->ses, attr->val.string, attr->len);
+				break;
 		}
 	}
 
 	if (dns.ses)
 		triton_event_fire(EV_DNS, &dns);
+
 	if (wins.ses)
 		triton_event_fire(EV_WINS, &wins);