1/* 2 Unix SMB/CIFS implementation. 3 4 WINS Replication server 5 6 Copyright (C) Stefan Metzmacher 2005 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. 20*/ 21 22#include "includes.h" 23#include "lib/socket/socket.h" 24#include "lib/stream/packet.h" 25#include "smbd/service_task.h" 26#include "smbd/service_stream.h" 27#include "smbd/service.h" 28#include "lib/messaging/irpc.h" 29#include "librpc/gen_ndr/ndr_winsrepl.h" 30#include "wrepl_server/wrepl_server.h" 31#include "smbd/process_model.h" 32#include "system/network.h" 33#include "lib/socket/netif.h" 34#include "param/param.h" 35 36void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason) 37{ 38 stream_terminate_connection(wreplconn->conn, reason); 39} 40 41static int terminate_after_send_destructor(struct wreplsrv_in_connection **tas) 42{ 43 wreplsrv_terminate_in_connection(*tas, "wreplsrv_in_connection: terminate_after_send"); 44 return 0; 45} 46 47/* 48 receive some data on a WREPL connection 49*/ 50static NTSTATUS wreplsrv_recv_request(void *private_data, DATA_BLOB blob) 51{ 52 struct wreplsrv_in_connection *wreplconn = talloc_get_type(private_data, struct wreplsrv_in_connection); 53 struct wreplsrv_in_call *call; 54 DATA_BLOB packet_in_blob; 55 DATA_BLOB packet_out_blob; 56 struct wrepl_wrap packet_out_wrap; 57 NTSTATUS status; 58 enum ndr_err_code ndr_err; 59 60 call = talloc_zero(wreplconn, struct wreplsrv_in_call); 61 NT_STATUS_HAVE_NO_MEMORY(call); 62 call->wreplconn = wreplconn; 63 talloc_steal(call, blob.data); 64 65 packet_in_blob.data = blob.data + 4; 66 packet_in_blob.length = blob.length - 4; 67 68 ndr_err = ndr_pull_struct_blob(&packet_in_blob, call, 69 lp_iconv_convenience(wreplconn->service->task->lp_ctx), 70 &call->req_packet, 71 (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet); 72 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { 73 return ndr_map_error2ntstatus(ndr_err); 74 } 75 76 if (DEBUGLVL(10)) { 77 DEBUG(10,("Received WINS-Replication packet of length %u\n", 78 (unsigned)packet_in_blob.length + 4)); 79 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet); 80 } 81 82 status = wreplsrv_in_call(call); 83 NT_STATUS_IS_ERR_RETURN(status); 84 if (!NT_STATUS_IS_OK(status)) { 85 /* w2k just ignores invalid packets, so we do */ 86 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n")); 87 talloc_free(call); 88 return NT_STATUS_OK; 89 } 90 91 /* and now encode the reply */ 92 packet_out_wrap.packet = call->rep_packet; 93 ndr_err = ndr_push_struct_blob(&packet_out_blob, call, 94 lp_iconv_convenience(wreplconn->service->task->lp_ctx), 95 &packet_out_wrap, 96 (ndr_push_flags_fn_t)ndr_push_wrepl_wrap); 97 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { 98 return ndr_map_error2ntstatus(ndr_err); 99 } 100 101 if (DEBUGLVL(10)) { 102 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length)); 103 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet); 104 } 105 106 if (call->terminate_after_send) { 107 struct wreplsrv_in_connection **tas; 108 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *); 109 NT_STATUS_HAVE_NO_MEMORY(tas); 110 *tas = wreplconn; 111 talloc_set_destructor(tas, terminate_after_send_destructor); 112 } 113 114 status = packet_send(wreplconn->packet, packet_out_blob); 115 NT_STATUS_NOT_OK_RETURN(status); 116 117 talloc_free(call); 118 return NT_STATUS_OK; 119} 120 121/* 122 called when the socket becomes readable 123*/ 124static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags) 125{ 126 struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private_data, 127 struct wreplsrv_in_connection); 128 129 packet_recv(wreplconn->packet); 130} 131 132/* 133 called when the socket becomes writable 134*/ 135static void wreplsrv_send(struct stream_connection *conn, uint16_t flags) 136{ 137 struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private_data, 138 struct wreplsrv_in_connection); 139 packet_queue_run(wreplconn->packet); 140} 141 142/* 143 handle socket recv errors 144*/ 145static void wreplsrv_recv_error(void *private_data, NTSTATUS status) 146{ 147 struct wreplsrv_in_connection *wreplconn = talloc_get_type(private_data, 148 struct wreplsrv_in_connection); 149 wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status)); 150} 151 152/* 153 called when we get a new connection 154*/ 155static void wreplsrv_accept(struct stream_connection *conn) 156{ 157 struct wreplsrv_service *service = talloc_get_type(conn->private_data, struct wreplsrv_service); 158 struct wreplsrv_in_connection *wreplconn; 159 struct socket_address *peer_ip; 160 161 wreplconn = talloc_zero(conn, struct wreplsrv_in_connection); 162 if (!wreplconn) { 163 stream_terminate_connection(conn, "wreplsrv_accept: out of memory"); 164 return; 165 } 166 167 wreplconn->packet = packet_init(wreplconn); 168 if (!wreplconn->packet) { 169 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory"); 170 return; 171 } 172 packet_set_private(wreplconn->packet, wreplconn); 173 packet_set_socket(wreplconn->packet, conn->socket); 174 packet_set_callback(wreplconn->packet, wreplsrv_recv_request); 175 packet_set_full_request(wreplconn->packet, packet_full_request_u32); 176 packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error); 177 packet_set_event_context(wreplconn->packet, conn->event.ctx); 178 packet_set_fde(wreplconn->packet, conn->event.fde); 179 packet_set_serialise(wreplconn->packet); 180 181 wreplconn->conn = conn; 182 wreplconn->service = service; 183 184 peer_ip = socket_get_peer_addr(conn->socket, wreplconn); 185 if (!peer_ip) { 186 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel"); 187 return; 188 } 189 190 wreplconn->partner = wreplsrv_find_partner(service, peer_ip->addr); 191 192 conn->private_data = wreplconn; 193 194 irpc_add_name(conn->msg_ctx, "wreplsrv_connection"); 195} 196 197static const struct stream_server_ops wreplsrv_stream_ops = { 198 .name = "wreplsrv", 199 .accept_connection = wreplsrv_accept, 200 .recv_handler = wreplsrv_recv, 201 .send_handler = wreplsrv_send, 202}; 203 204/* 205 called when we get a new connection 206*/ 207NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner, 208 struct socket_context *sock, 209 struct packet_context *packet, 210 struct wreplsrv_in_connection **_wrepl_in) 211{ 212 struct wreplsrv_service *service = partner->service; 213 struct wreplsrv_in_connection *wrepl_in; 214 const struct model_ops *model_ops; 215 struct stream_connection *conn; 216 NTSTATUS status; 217 218 /* within the wrepl task we want to be a single process, so 219 ask for the single process model ops and pass these to the 220 stream_setup_socket() call. */ 221 model_ops = process_model_startup(service->task->event_ctx, "single"); 222 if (!model_ops) { 223 DEBUG(0,("Can't find 'single' process model_ops")); 224 return NT_STATUS_INTERNAL_ERROR; 225 } 226 227 wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection); 228 NT_STATUS_HAVE_NO_MEMORY(wrepl_in); 229 230 wrepl_in->service = service; 231 wrepl_in->partner = partner; 232 233 status = stream_new_connection_merge(service->task->event_ctx, service->task->lp_ctx, model_ops, 234 sock, &wreplsrv_stream_ops, service->task->msg_ctx, 235 wrepl_in, &conn); 236 NT_STATUS_NOT_OK_RETURN(status); 237 238 /* 239 * make the wreplsrv_in_connection structure a child of the 240 * stream_connection, to match the hierarchy of wreplsrv_accept 241 */ 242 wrepl_in->conn = conn; 243 talloc_steal(conn, wrepl_in); 244 245 /* 246 * now update the packet handling callback,... 247 */ 248 wrepl_in->packet = talloc_steal(wrepl_in, packet); 249 packet_set_private(wrepl_in->packet, wrepl_in); 250 packet_set_socket(wrepl_in->packet, conn->socket); 251 packet_set_callback(wrepl_in->packet, wreplsrv_recv_request); 252 packet_set_full_request(wrepl_in->packet, packet_full_request_u32); 253 packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error); 254 packet_set_event_context(wrepl_in->packet, conn->event.ctx); 255 packet_set_fde(wrepl_in->packet, conn->event.fde); 256 packet_set_serialise(wrepl_in->packet); 257 258 *_wrepl_in = wrepl_in; 259 return NT_STATUS_OK; 260} 261 262/* 263 startup the wrepl port 42 server sockets 264*/ 265NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx) 266{ 267 NTSTATUS status; 268 struct task_server *task = service->task; 269 const struct model_ops *model_ops; 270 const char *address; 271 uint16_t port = WINS_REPLICATION_PORT; 272 273 /* within the wrepl task we want to be a single process, so 274 ask for the single process model ops and pass these to the 275 stream_setup_socket() call. */ 276 model_ops = process_model_startup(task->event_ctx, "single"); 277 if (!model_ops) { 278 DEBUG(0,("Can't find 'single' process model_ops")); 279 return NT_STATUS_INTERNAL_ERROR; 280 } 281 282 if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) { 283 int num_interfaces; 284 int i; 285 struct interface *ifaces; 286 287 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces); 288 289 num_interfaces = iface_count(ifaces); 290 291 /* We have been given an interfaces line, and been 292 told to only bind to those interfaces. Create a 293 socket per interface and bind to only these. 294 */ 295 for(i = 0; i < num_interfaces; i++) { 296 address = iface_n_ip(ifaces, i); 297 status = stream_setup_socket(task->event_ctx, 298 task->lp_ctx, model_ops, 299 &wreplsrv_stream_ops, 300 "ipv4", address, &port, 301 lp_socket_options(task->lp_ctx), 302 service); 303 if (!NT_STATUS_IS_OK(status)) { 304 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n", 305 address, port, nt_errstr(status))); 306 return status; 307 } 308 } 309 } else { 310 address = lp_socket_address(lp_ctx); 311 status = stream_setup_socket(task->event_ctx, task->lp_ctx, 312 model_ops, &wreplsrv_stream_ops, 313 "ipv4", address, &port, lp_socket_options(task->lp_ctx), 314 service); 315 if (!NT_STATUS_IS_OK(status)) { 316 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n", 317 address, port, nt_errstr(status))); 318 return status; 319 } 320 } 321 322 return NT_STATUS_OK; 323} 324