code.delx.au - pulseaudio/blob - src/pulsecore/socket-server.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <stdio.h>
  32 #include <unistd.h>
  33 #include <sys/stat.h>
  34
  35 #ifdef HAVE_SYS_SOCKET_H
  36 #include <sys/socket.h>
  37 #endif
  38 #ifdef HAVE_SYS_UN_H
  39 #include <sys/un.h>
  40 #ifndef SUN_LEN
  41 #define SUN_LEN(ptr) \
  42     ((size_t)(((struct sockaddr_un *) 0)->sun_path) + strlen((ptr)->sun_path))
  43 #endif
  44 #endif
  45 #ifdef HAVE_ARPA_INET_H
  46 #include <arpa/inet.h>
  47 #endif
  48 #ifdef HAVE_NETINET_IN_H
  49 #include <netinet/in.h>
  50 #endif
  51
  52 #ifdef HAVE_LIBWRAP
  53 #include <tcpd.h>
  54 #endif
  55
  56 #ifndef HAVE_INET_NTOP
  57 #include "inet_ntop.h"
  58 #endif
  59
  60 #ifndef HAVE_INET_PTON
  61 #include "inet_pton.h"
  62 #endif
  63
  64 #include "winsock.h"
  65
  66 #include <pulse/xmalloc.h>
  67 #include <pulse/util.h>
  68
  69 #include <pulsecore/socket-util.h>
  70 #include <pulsecore/core-util.h>
  71 #include <pulsecore/log.h>
  72 #include <pulsecore/macro.h>
  73 #include <pulsecore/core-error.h>
  74 #include <pulsecore/refcnt.h>
  75
  76 #include "socket-server.h"
  77
  78 struct pa_socket_server {
  79     PA_REFCNT_DECLARE;
  80     int fd;
  81     char *filename;
  82     char *tcpwrap_service;
  83
  84     pa_socket_server_on_connection_cb_t on_connection;
  85     void *userdata;
  86
  87     pa_io_event *io_event;
  88     pa_mainloop_api *mainloop;
  89     enum { SOCKET_SERVER_GENERIC, SOCKET_SERVER_IPV4, SOCKET_SERVER_UNIX, SOCKET_SERVER_IPV6 } type;
  90 };
  91
  92 static void callback(pa_mainloop_api *mainloop, pa_io_event *e, int fd, pa_io_event_flags_t f, void *userdata) {
  93     pa_socket_server *s = userdata;
  94     pa_iochannel *io;
  95     int nfd;
  96
  97     pa_assert(s);
  98     pa_assert(PA_REFCNT_VALUE(s) >= 1);
  99     pa_assert(s->mainloop == mainloop);
 100     pa_assert(s->io_event == e);
 101     pa_assert(e);
 102     pa_assert(fd >= 0);
 103     pa_assert(fd == s->fd);
 104
 105     pa_socket_server_ref(s);
 106
 107     if ((nfd = accept(fd, NULL, NULL)) < 0) {
 108         pa_log("accept(): %s", pa_cstrerror(errno));
 109         goto finish;
 110     }
 111
 112     pa_make_fd_cloexec(nfd);
 113
 114     if (!s->on_connection) {
 115         pa_close(nfd);
 116         goto finish;
 117     }
 118
 119 #ifdef HAVE_LIBWRAP
 120
 121     if (s->tcpwrap_service) {
 122         struct request_info req;
 123
 124         request_init(&req, RQ_DAEMON, s->tcpwrap_service, RQ_FILE, nfd, NULL);
 125         fromhost(&req);
 126         if (!hosts_access(&req)) {
 127             pa_log_warn("TCP connection refused by tcpwrap.");
 128             pa_close(nfd);
 129             goto finish;
 130         }
 131
 132         pa_log_info("TCP connection accepted by tcpwrap.");
 133     }
 134 #endif
 135
 136     /* There should be a check for socket type here */
 137     if (s->type == SOCKET_SERVER_IPV4)
 138         pa_make_tcp_socket_low_delay(fd);
 139     else
 140         pa_make_socket_low_delay(fd);
 141
 142     pa_assert_se(io = pa_iochannel_new(s->mainloop, nfd, nfd));
 143     s->on_connection(s, io, s->userdata);
 144
 145 finish:
 146     pa_socket_server_unref(s);
 147 }
 148
 149 pa_socket_server* pa_socket_server_new(pa_mainloop_api *m, int fd) {
 150     pa_socket_server *s;
 151
 152     pa_assert(m);
 153     pa_assert(fd >= 0);
 154
 155     s = pa_xnew(pa_socket_server, 1);
 156     PA_REFCNT_INIT(s);
 157     s->fd = fd;
 158     s->filename = NULL;
 159     s->on_connection = NULL;
 160     s->userdata = NULL;
 161     s->tcpwrap_service = NULL;
 162
 163     s->mainloop = m;
 164     pa_assert_se(s->io_event = m->io_new(m, fd, PA_IO_EVENT_INPUT, callback, s));
 165
 166     s->type = SOCKET_SERVER_GENERIC;
 167
 168     return s;
 169 }
 170
 171 pa_socket_server* pa_socket_server_ref(pa_socket_server *s) {
 172     pa_assert(s);
 173     pa_assert(PA_REFCNT_VALUE(s) >= 1);
 174
 175     PA_REFCNT_INC(s);
 176     return s;
 177 }
 178
 179 #ifdef HAVE_SYS_UN_H
 180
 181 pa_socket_server* pa_socket_server_new_unix(pa_mainloop_api *m, const char *filename) {
 182     int fd = -1;
 183     struct sockaddr_un sa;
 184     pa_socket_server *s;
 185
 186     pa_assert(m);
 187     pa_assert(filename);
 188
 189     if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
 190         pa_log("socket(): %s", pa_cstrerror(errno));
 191         goto fail;
 192     }
 193
 194     pa_make_fd_cloexec(fd);
 195
 196     memset(&sa, 0, sizeof(sa));
 197     sa.sun_family = AF_UNIX;
 198     pa_strlcpy(sa.sun_path, filename, sizeof(sa.sun_path));
 199
 200     pa_make_socket_low_delay(fd);
 201
 202     if (bind(fd, (struct sockaddr*) &sa, (socklen_t) SUN_LEN(&sa)) < 0) {
 203         pa_log("bind(): %s", pa_cstrerror(errno));
 204         goto fail;
 205     }
 206
 207     /* Allow access from all clients. Sockets like this one should
 208      * always be put inside a directory with proper access rights,
 209      * because not all OS check the access rights on the socket
 210      * inodes. */
 211     chmod(filename, 0777);
 212
 213     if (listen(fd, 5) < 0) {
 214         pa_log("listen(): %s", pa_cstrerror(errno));
 215         goto fail;
 216     }
 217
 218     pa_assert_se(s = pa_socket_server_new(m, fd));
 219
 220     s->filename = pa_xstrdup(filename);
 221     s->type = SOCKET_SERVER_UNIX;
 222
 223     return s;
 224
 225 fail:
 226     if (fd >= 0)
 227         pa_close(fd);
 228
 229     return NULL;
 230 }
 231
 232 #else /* HAVE_SYS_UN_H */
 233
 234 pa_socket_server* pa_socket_server_new_unix(pa_mainloop_api *m, const char *filename) {
 235     return NULL;
 236 }
 237
 238 #endif /* HAVE_SYS_UN_H */
 239
 240 pa_socket_server* pa_socket_server_new_ipv4(pa_mainloop_api *m, uint32_t address, uint16_t port, const char *tcpwrap_service) {
 241     pa_socket_server *ss;
 242     int fd = -1;
 243     struct sockaddr_in sa;
 244     int on = 1;
 245
 246     pa_assert(m);
 247     pa_assert(port);
 248
 249     if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
 250         pa_log("socket(PF_INET): %s", pa_cstrerror(errno));
 251         goto fail;
 252     }
 253
 254     pa_make_fd_cloexec(fd);
 255
 256 #ifdef SO_REUSEADDR
 257     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
 258         pa_log("setsockopt(): %s", pa_cstrerror(errno));
 259 #endif
 260
 261     pa_make_tcp_socket_low_delay(fd);
 262
 263     memset(&sa, 0, sizeof(sa));
 264     sa.sin_family = AF_INET;
 265     sa.sin_port = htons(port);
 266     sa.sin_addr.s_addr = htonl(address);
 267
 268     if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
 269         pa_log("bind(): %s", pa_cstrerror(errno));
 270         goto fail;
 271     }
 272
 273     if (listen(fd, 5) < 0) {
 274         pa_log("listen(): %s", pa_cstrerror(errno));
 275         goto fail;
 276     }
 277
 278     if ((ss = pa_socket_server_new(m, fd))) {
 279         ss->type = SOCKET_SERVER_IPV4;
 280         ss->tcpwrap_service = pa_xstrdup(tcpwrap_service);
 281     }
 282
 283     return ss;
 284
 285 fail:
 286     if (fd >= 0)
 287         pa_close(fd);
 288
 289     return NULL;
 290 }
 291
 292 #ifdef HAVE_IPV6
 293 pa_socket_server* pa_socket_server_new_ipv6(pa_mainloop_api *m, const uint8_t address[16], uint16_t port, const char *tcpwrap_service) {
 294     pa_socket_server *ss;
 295     int fd = -1;
 296     struct sockaddr_in6 sa;
 297     int on;
 298
 299     pa_assert(m);
 300     pa_assert(port > 0);
 301
 302     if ((fd = socket(PF_INET6, SOCK_STREAM, 0)) < 0) {
 303         pa_log("socket(PF_INET6): %s", pa_cstrerror(errno));
 304         goto fail;
 305     }
 306
 307     pa_make_fd_cloexec(fd);
 308
 309 #ifdef IPV6_V6ONLY
 310     on = 1;
 311     if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
 312         pa_log("setsockopt(IPPROTO_IPV6, IPV6_V6ONLY): %s", pa_cstrerror(errno));
 313 #endif
 314
 315 #ifdef SO_REUSEADDR
 316     on = 1;
 317     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
 318         pa_log("setsockopt(SOL_SOCKET, SO_REUSEADDR, 1): %s", pa_cstrerror(errno));
 319 #endif
 320
 321     pa_make_tcp_socket_low_delay(fd);
 322
 323     memset(&sa, 0, sizeof(sa));
 324     sa.sin6_family = AF_INET6;
 325     sa.sin6_port = htons(port);
 326     memcpy(sa.sin6_addr.s6_addr, address, 16);
 327
 328     if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
 329         pa_log("bind(): %s", pa_cstrerror(errno));
 330         goto fail;
 331     }
 332
 333     if (listen(fd, 5) < 0) {
 334         pa_log("listen(): %s", pa_cstrerror(errno));
 335         goto fail;
 336     }
 337
 338     if ((ss = pa_socket_server_new(m, fd))) {
 339         ss->type = SOCKET_SERVER_IPV6;
 340         ss->tcpwrap_service = pa_xstrdup(tcpwrap_service);
 341     }
 342
 343     return ss;
 344
 345 fail:
 346     if (fd >= 0)
 347         pa_close(fd);
 348
 349     return NULL;
 350 }
 351 #endif
 352
 353 pa_socket_server* pa_socket_server_new_ipv4_loopback(pa_mainloop_api *m, uint16_t port, const char *tcpwrap_service) {
 354     pa_assert(m);
 355     pa_assert(port > 0);
 356
 357     return pa_socket_server_new_ipv4(m, INADDR_LOOPBACK, port, tcpwrap_service);
 358 }
 359
 360 #ifdef HAVE_IPV6
 361 pa_socket_server* pa_socket_server_new_ipv6_loopback(pa_mainloop_api *m, uint16_t port, const char *tcpwrap_service) {
 362     pa_assert(m);
 363     pa_assert(port > 0);
 364
 365     return pa_socket_server_new_ipv6(m, in6addr_loopback.s6_addr, port, tcpwrap_service);
 366 }
 367 #endif
 368
 369 pa_socket_server* pa_socket_server_new_ipv4_any(pa_mainloop_api *m, uint16_t port, const char *tcpwrap_service) {
 370     pa_assert(m);
 371     pa_assert(port > 0);
 372
 373     return pa_socket_server_new_ipv4(m, INADDR_ANY, port, tcpwrap_service);
 374 }
 375
 376 #ifdef HAVE_IPV6
 377 pa_socket_server* pa_socket_server_new_ipv6_any(pa_mainloop_api *m, uint16_t port, const char *tcpwrap_service) {
 378     pa_assert(m);
 379     pa_assert(port > 0);
 380
 381     return pa_socket_server_new_ipv6(m, in6addr_any.s6_addr, port, tcpwrap_service);
 382 }
 383 #endif
 384
 385 pa_socket_server* pa_socket_server_new_ipv4_string(pa_mainloop_api *m, const char *name, uint16_t port, const char *tcpwrap_service) {
 386     struct in_addr ipv4;
 387
 388     pa_assert(m);
 389     pa_assert(name);
 390     pa_assert(port > 0);
 391
 392     if (inet_pton(AF_INET, name, &ipv4) > 0)
 393         return pa_socket_server_new_ipv4(m, ntohl(ipv4.s_addr), port, tcpwrap_service);
 394
 395     return NULL;
 396 }
 397
 398 #ifdef HAVE_IPV6
 399 pa_socket_server* pa_socket_server_new_ipv6_string(pa_mainloop_api *m, const char *name, uint16_t port, const char *tcpwrap_service) {
 400     struct in6_addr ipv6;
 401
 402     pa_assert(m);
 403     pa_assert(name);
 404     pa_assert(port > 0);
 405
 406     if (inet_pton(AF_INET6, name, &ipv6) > 0)
 407         return pa_socket_server_new_ipv6(m, ipv6.s6_addr, port, tcpwrap_service);
 408
 409     return NULL;
 410 }
 411 #endif
 412
 413 static void socket_server_free(pa_socket_server*s) {
 414     pa_assert(s);
 415
 416     if (s->filename) {
 417         unlink(s->filename);
 418         pa_xfree(s->filename);
 419     }
 420
 421     pa_close(s->fd);
 422
 423     pa_xfree(s->tcpwrap_service);
 424
 425     s->mainloop->io_free(s->io_event);
 426     pa_xfree(s);
 427 }
 428
 429 void pa_socket_server_unref(pa_socket_server *s) {
 430     pa_assert(s);
 431     pa_assert(PA_REFCNT_VALUE(s) >= 1);
 432
 433     if (PA_REFCNT_DEC(s) <= 0)
 434         socket_server_free(s);
 435 }
 436
 437 void pa_socket_server_set_callback(pa_socket_server*s, pa_socket_server_on_connection_cb_t on_connection, void *userdata) {
 438     pa_assert(s);
 439     pa_assert(PA_REFCNT_VALUE(s) >= 1);
 440
 441     s->on_connection = on_connection;
 442     s->userdata = userdata;
 443 }
 444
 445 char *pa_socket_server_get_address(pa_socket_server *s, char *c, size_t l) {
 446     pa_assert(s);
 447     pa_assert(PA_REFCNT_VALUE(s) >= 1);
 448     pa_assert(c);
 449     pa_assert(l > 0);
 450
 451     switch (s->type) {
 452 #ifdef HAVE_IPV6
 453         case SOCKET_SERVER_IPV6: {
 454             struct sockaddr_in6 sa;
 455             socklen_t sa_len = sizeof(sa);
 456
 457             if (getsockname(s->fd, (struct sockaddr*) &sa, &sa_len) < 0) {
 458                 pa_log("getsockname(): %s", pa_cstrerror(errno));
 459                 return NULL;
 460             }
 461
 462             if (memcmp(&in6addr_any, &sa.sin6_addr, sizeof(in6addr_any)) == 0) {
 463                 char fqdn[256];
 464                 if (!pa_get_fqdn(fqdn, sizeof(fqdn)))
 465                     return NULL;
 466
 467                 pa_snprintf(c, l, "tcp6:%s:%u", fqdn, (unsigned) ntohs(sa.sin6_port));
 468
 469             } else if (memcmp(&in6addr_loopback, &sa.sin6_addr, sizeof(in6addr_loopback)) == 0) {
 470                 char *id;
 471
 472                 if (!(id = pa_machine_id()))
 473                     return NULL;
 474
 475                 pa_snprintf(c, l, "{%s}tcp6:localhost:%u", id, (unsigned) ntohs(sa.sin6_port));
 476                 pa_xfree(id);
 477             } else {
 478                 char ip[INET6_ADDRSTRLEN];
 479
 480                 if (!inet_ntop(AF_INET6, &sa.sin6_addr, ip, sizeof(ip))) {
 481                     pa_log("inet_ntop(): %s", pa_cstrerror(errno));
 482                     return NULL;
 483                 }
 484
 485                 pa_snprintf(c, l, "tcp6:[%s]:%u", ip, (unsigned) ntohs(sa.sin6_port));
 486             }
 487
 488             return c;
 489         }
 490 #endif
 491
 492         case SOCKET_SERVER_IPV4: {
 493             struct sockaddr_in sa;
 494             socklen_t sa_len = sizeof(sa);
 495
 496             if (getsockname(s->fd, (struct sockaddr*) &sa, &sa_len) < 0) {
 497                 pa_log("getsockname(): %s", pa_cstrerror(errno));
 498                 return NULL;
 499             }
 500
 501             if (sa.sin_addr.s_addr == INADDR_ANY) {
 502                 char fqdn[256];
 503                 if (!pa_get_fqdn(fqdn, sizeof(fqdn)))
 504                     return NULL;
 505
 506                 pa_snprintf(c, l, "tcp:%s:%u", fqdn, (unsigned) ntohs(sa.sin_port));
 507             } else if (sa.sin_addr.s_addr == INADDR_LOOPBACK) {
 508                 char *id;
 509
 510                 if (!(id = pa_machine_id()))
 511                     return NULL;
 512
 513                 pa_snprintf(c, l, "{%s}tcp:localhost:%u", id, (unsigned) ntohs(sa.sin_port));
 514                 pa_xfree(id);
 515             } else {
 516                 char ip[INET_ADDRSTRLEN];
 517
 518                 if (!inet_ntop(AF_INET, &sa.sin_addr, ip, sizeof(ip))) {
 519                     pa_log("inet_ntop(): %s", pa_cstrerror(errno));
 520                     return NULL;
 521                 }
 522
 523                 pa_snprintf(c, l, "tcp:[%s]:%u", ip, (unsigned) ntohs(sa.sin_port));
 524             }
 525
 526             return c;
 527         }
 528
 529         case SOCKET_SERVER_UNIX: {
 530             char *id;
 531
 532             if (!s->filename)
 533                 return NULL;
 534
 535             if (!(id = pa_machine_id()))
 536                 return NULL;
 537
 538             pa_snprintf(c, l, "{%s}unix:%s", id, s->filename);
 539             pa_xfree(id);
 540             return c;
 541         }
 542
 543         default:
 544             return NULL;
 545     }
 546 }