source4/lib/socket/socket_unix.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    unix domain socket functions
   5
   6    Copyright (C) Stefan Metzmacher 2004
   7    Copyright (C) Andrew Tridgell 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/socket/socket.h"
  25 #include "system/network.h"
  26 #include "system/filesys.h"
  27
  28 _PUBLIC_ const struct socket_ops *socket_unixdom_ops(enum socket_type type);
  29
  30
  31 /*
  32   approximate errno mapping
  33 */
  34 static NTSTATUS unixdom_error(int ernum)
  35 {
  36         return map_nt_error_from_unix_common(ernum);
  37 }
  38
  39 static NTSTATUS unixdom_init(struct socket_context *sock)
  40 {
  41         int type;
  42
  43         switch (sock->type) {
  44         case SOCKET_TYPE_STREAM:
  45                 type = SOCK_STREAM;
  46                 break;
  47         case SOCKET_TYPE_DGRAM:
  48                 type = SOCK_DGRAM;
  49                 break;
  50         default:
  51                 return NT_STATUS_INVALID_PARAMETER;
  52         }
  53
  54         sock->fd = socket(PF_UNIX, type, 0);
  55         if (sock->fd == -1) {
  56                 return map_nt_error_from_unix_common(errno);
  57         }
  58         sock->private_data = NULL;
  59
  60         sock->backend_name = "unix";
  61
  62         smb_set_close_on_exec(sock->fd);
  63
  64         return NT_STATUS_OK;
  65 }
  66
  67 static void unixdom_close(struct socket_context *sock)
  68 {
  69         close(sock->fd);
  70 }
  71
  72 static NTSTATUS unixdom_connect_complete(struct socket_context *sock, uint32_t flags)
  73 {
  74         int error=0, ret;
  75         socklen_t len = sizeof(error);
  76
  77         /* check for any errors that may have occurred - this is needed
  78            for non-blocking connect */
  79         ret = getsockopt(sock->fd, SOL_SOCKET, SO_ERROR, &error, &len);
  80         if (ret == -1) {
  81                 return map_nt_error_from_unix_common(errno);
  82         }
  83         if (error != 0) {
  84                 return map_nt_error_from_unix_common(error);
  85         }
  86
  87         if (!(flags & SOCKET_FLAG_BLOCK)) {
  88                 ret = set_blocking(sock->fd, false);
  89                 if (ret == -1) {
  90                         return map_nt_error_from_unix_common(errno);
  91                 }
  92         }
  93
  94         sock->state = SOCKET_STATE_CLIENT_CONNECTED;
  95
  96         return NT_STATUS_OK;
  97 }
  98
  99 static NTSTATUS unixdom_connect(struct socket_context *sock,
 100                                 const struct socket_address *my_address,
 101                                 const struct socket_address *srv_address,
 102                                 uint32_t flags)
 103 {
 104         int ret;
 105
 106         if (srv_address->sockaddr) {
 107                 ret = connect(sock->fd, srv_address->sockaddr, srv_address->sockaddrlen);
 108         } else {
 109                 struct sockaddr_un srv_addr;
 110                 if (strlen(srv_address->addr)+1 > sizeof(srv_addr.sun_path)) {
 111                         return NT_STATUS_OBJECT_PATH_INVALID;
 112                 }
 113
 114                 ZERO_STRUCT(srv_addr);
 115                 srv_addr.sun_family = AF_UNIX;
 116                 snprintf(srv_addr.sun_path, sizeof(srv_addr.sun_path), "%s", srv_address->addr);
 117
 118                 ret = connect(sock->fd, (const struct sockaddr *)&srv_addr, sizeof(srv_addr));
 119         }
 120         if (ret == -1) {
 121                 return unixdom_error(errno);
 122         }
 123
 124         return unixdom_connect_complete(sock, flags);
 125 }
 126
 127 static NTSTATUS unixdom_listen(struct socket_context *sock,
 128                                const struct socket_address *my_address,
 129                                int queue_size, uint32_t flags)
 130 {
 131         struct sockaddr_un my_addr;
 132         int ret;
 133
 134         /* delete if it already exists */
 135         if (my_address->addr) {
 136                 unlink(my_address->addr);
 137         }
 138
 139         if (my_address->sockaddr) {
 140                 ret = bind(sock->fd, (struct sockaddr *)&my_addr, sizeof(my_addr));
 141         } else if (my_address->addr == NULL) {
 142                 return NT_STATUS_INVALID_PARAMETER;
 143         } else {
 144                 if (strlen(my_address->addr)+1 > sizeof(my_addr.sun_path)) {
 145                         return NT_STATUS_OBJECT_PATH_INVALID;
 146                 }
 147
 148
 149                 ZERO_STRUCT(my_addr);
 150                 my_addr.sun_family = AF_UNIX;
 151                 snprintf(my_addr.sun_path, sizeof(my_addr.sun_path), "%s", my_address->addr);
 152
 153                 ret = bind(sock->fd, (struct sockaddr *)&my_addr, sizeof(my_addr));
 154         }
 155         if (ret == -1) {
 156                 return unixdom_error(errno);
 157         }
 158
 159         if (sock->type == SOCKET_TYPE_STREAM) {
 160                 ret = listen(sock->fd, queue_size);
 161                 if (ret == -1) {
 162                         return unixdom_error(errno);
 163                 }
 164         }
 165
 166         if (!(flags & SOCKET_FLAG_BLOCK)) {
 167                 ret = set_blocking(sock->fd, false);
 168                 if (ret == -1) {
 169                         return unixdom_error(errno);
 170                 }
 171         }
 172
 173         sock->state = SOCKET_STATE_SERVER_LISTEN;
 174         sock->private_data = (void *)talloc_strdup(sock, my_address->addr);
 175
 176         return NT_STATUS_OK;
 177 }
 178
 179 static NTSTATUS unixdom_accept(struct socket_context *sock,
 180                                struct socket_context **new_sock)
 181 {
 182         struct sockaddr_un cli_addr;
 183         socklen_t cli_addr_len = sizeof(cli_addr);
 184         int new_fd;
 185
 186         if (sock->type != SOCKET_TYPE_STREAM) {
 187                 return NT_STATUS_INVALID_PARAMETER;
 188         }
 189
 190         new_fd = accept(sock->fd, (struct sockaddr *)&cli_addr, &cli_addr_len);
 191         if (new_fd == -1) {
 192                 return unixdom_error(errno);
 193         }
 194
 195         if (!(sock->flags & SOCKET_FLAG_BLOCK)) {
 196                 int ret = set_blocking(new_fd, false);
 197                 if (ret == -1) {
 198                         close(new_fd);
 199                         return map_nt_error_from_unix_common(errno);
 200                 }
 201         }
 202
 203         smb_set_close_on_exec(new_fd);
 204
 205         (*new_sock) = talloc(NULL, struct socket_context);
 206         if (!(*new_sock)) {
 207                 close(new_fd);
 208                 return NT_STATUS_NO_MEMORY;
 209         }
 210
 211         /* copy the socket_context */
 212         (*new_sock)->type               = sock->type;
 213         (*new_sock)->state              = SOCKET_STATE_SERVER_CONNECTED;
 214         (*new_sock)->flags              = sock->flags;
 215
 216         (*new_sock)->fd                 = new_fd;
 217
 218         (*new_sock)->private_data       = NULL;
 219         (*new_sock)->ops                = sock->ops;
 220         (*new_sock)->backend_name       = sock->backend_name;
 221
 222         return NT_STATUS_OK;
 223 }
 224
 225 static NTSTATUS unixdom_recv(struct socket_context *sock, void *buf,
 226                              size_t wantlen, size_t *nread)
 227 {
 228         ssize_t gotlen;
 229
 230         *nread = 0;
 231
 232         gotlen = recv(sock->fd, buf, wantlen, 0);
 233         if (gotlen == 0) {
 234                 return NT_STATUS_END_OF_FILE;
 235         } else if (gotlen == -1) {
 236                 return unixdom_error(errno);
 237         }
 238
 239         *nread = gotlen;
 240
 241         return NT_STATUS_OK;
 242 }
 243
 244 static NTSTATUS unixdom_send(struct socket_context *sock,
 245                              const DATA_BLOB *blob, size_t *sendlen)
 246 {
 247         ssize_t len;
 248
 249         *sendlen = 0;
 250
 251         len = send(sock->fd, blob->data, blob->length, 0);
 252         if (len == -1) {
 253                 return unixdom_error(errno);
 254         }
 255
 256         *sendlen = len;
 257
 258         return NT_STATUS_OK;
 259 }
 260
 261
 262 static NTSTATUS unixdom_sendto(struct socket_context *sock,
 263                                const DATA_BLOB *blob, size_t *sendlen,
 264                                const struct socket_address *dest)
 265 {
 266         struct sockaddr_un srv_addr;
 267         const struct sockaddr *sa;
 268         socklen_t sa_len;
 269         ssize_t len;
 270
 271         *sendlen = 0;
 272
 273         if (dest->sockaddr) {
 274                 sa = dest->sockaddr;
 275                 sa_len = dest->sockaddrlen;
 276         } else {
 277                 if (strlen(dest->addr)+1 > sizeof(srv_addr.sun_path)) {
 278                         return NT_STATUS_OBJECT_PATH_INVALID;
 279                 }
 280
 281                 ZERO_STRUCT(srv_addr);
 282                 srv_addr.sun_family = AF_UNIX;
 283                 snprintf(srv_addr.sun_path, sizeof(srv_addr.sun_path), "%s",
 284                          dest->addr);
 285                 sa = (struct sockaddr *) &srv_addr;
 286                 sa_len = sizeof(srv_addr);
 287         }
 288
 289         len = sendto(sock->fd, blob->data, blob->length, 0, sa, sa_len);
 290
 291         /* retry once */
 292         if (len == -1 && errno == EMSGSIZE) {
 293                 /* round up in 1K increments */
 294                 int bufsize = ((blob->length + 1023) & (~1023));
 295                 if (setsockopt(sock->fd, SOL_SOCKET, SO_SNDBUF, &bufsize,
 296                                sizeof(bufsize)) == -1)
 297                 {
 298                         return map_nt_error_from_unix_common(EMSGSIZE);
 299                 }
 300                 len = sendto(sock->fd, blob->data, blob->length, 0, sa, sa_len);
 301         }
 302
 303         if (len == -1) {
 304                 return map_nt_error_from_unix_common(errno);
 305         }
 306
 307         *sendlen = len;
 308
 309         return NT_STATUS_OK;
 310 }
 311
 312
 313 static NTSTATUS unixdom_set_option(struct socket_context *sock,
 314                                    const char *option, const char *val)
 315 {
 316         return NT_STATUS_OK;
 317 }
 318
 319 static char *unixdom_get_peer_name(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 320 {
 321         return talloc_strdup(mem_ctx, "LOCAL/unixdom");
 322 }
 323
 324 static struct socket_address *unixdom_get_peer_addr(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 325 {
 326         struct sockaddr_in *peer_addr;
 327         socklen_t len = sizeof(*peer_addr);
 328         struct socket_address *peer;
 329         int ret;
 330
 331         peer = talloc(mem_ctx, struct socket_address);
 332         if (!peer) {
 333                 return NULL;
 334         }
 335
 336         peer->family = sock->backend_name;
 337         peer_addr = talloc(peer, struct sockaddr_in);
 338         if (!peer_addr) {
 339                 talloc_free(peer);
 340                 return NULL;
 341         }
 342
 343         peer->sockaddr = (struct sockaddr *)peer_addr;
 344
 345         ret = getpeername(sock->fd, peer->sockaddr, &len);
 346         if (ret == -1) {
 347                 talloc_free(peer);
 348                 return NULL;
 349         }
 350
 351         peer->sockaddrlen = len;
 352
 353         peer->port = 0;
 354         peer->addr = talloc_strdup(peer, "LOCAL/unixdom");
 355         if (!peer->addr) {
 356                 talloc_free(peer);
 357                 return NULL;
 358         }
 359
 360         return peer;
 361 }
 362
 363 static struct socket_address *unixdom_get_my_addr(struct socket_context *sock, TALLOC_CTX *mem_ctx)
 364 {
 365         struct sockaddr_in *local_addr;
 366         socklen_t len = sizeof(*local_addr);
 367         struct socket_address *local;
 368         int ret;
 369
 370         local = talloc(mem_ctx, struct socket_address);
 371         if (!local) {
 372                 return NULL;
 373         }
 374
 375         local->family = sock->backend_name;
 376         local_addr = talloc(local, struct sockaddr_in);
 377         if (!local_addr) {
 378                 talloc_free(local);
 379                 return NULL;
 380         }
 381
 382         local->sockaddr = (struct sockaddr *)local_addr;
 383
 384         ret = getsockname(sock->fd, local->sockaddr, &len);
 385         if (ret == -1) {
 386                 talloc_free(local);
 387                 return NULL;
 388         }
 389
 390         local->sockaddrlen = len;
 391
 392         local->port = 0;
 393         local->addr = talloc_strdup(local, "LOCAL/unixdom");
 394         if (!local->addr) {
 395                 talloc_free(local);
 396                 return NULL;
 397         }
 398
 399         return local;
 400 }
 401
 402 static int unixdom_get_fd(struct socket_context *sock)
 403 {
 404         return sock->fd;
 405 }
 406
 407 static NTSTATUS unixdom_pending(struct socket_context *sock, size_t *npending)
 408 {
 409         int value = 0;
 410         if (ioctl(sock->fd, FIONREAD, &value) == 0) {
 411                 *npending = value;
 412                 return NT_STATUS_OK;
 413         }
 414         return map_nt_error_from_unix_common(errno);
 415 }
 416
 417 static const struct socket_ops unixdom_ops = {
 418         .name                   = "unix",
 419         .fn_init                = unixdom_init,
 420         .fn_connect             = unixdom_connect,
 421         .fn_connect_complete    = unixdom_connect_complete,
 422         .fn_listen              = unixdom_listen,
 423         .fn_accept              = unixdom_accept,
 424         .fn_recv                = unixdom_recv,
 425         .fn_send                = unixdom_send,
 426         .fn_sendto              = unixdom_sendto,
 427         .fn_close               = unixdom_close,
 428         .fn_pending             = unixdom_pending,
 429
 430         .fn_set_option          = unixdom_set_option,
 431
 432         .fn_get_peer_name       = unixdom_get_peer_name,
 433         .fn_get_peer_addr       = unixdom_get_peer_addr,
 434         .fn_get_my_addr         = unixdom_get_my_addr,
 435
 436         .fn_get_fd              = unixdom_get_fd
 437 };
 438
 439 _PUBLIC_ const struct socket_ops *socket_unixdom_ops(enum socket_type type)
 440 {
 441         return &unixdom_ops;
 442 }