code.delx.au - pulseaudio/blob - src/pulsecore/iochannel.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <assert.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <errno.h>
  31
  32 #ifdef HAVE_SYS_SOCKET_H
  33 #include <sys/socket.h>
  34 #endif
  35 #ifdef HAVE_SYS_UN_H
  36 #include <sys/un.h>
  37 #endif
  38
  39 #include "winsock.h"
  40
  41 #include <pulse/xmalloc.h>
  42
  43 #include <pulsecore/core-error.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/socket-util.h>
  46 #include <pulsecore/log.h>
  47
  48 #include "iochannel.h"
  49
  50 struct pa_iochannel {
  51     int ifd, ofd;
  52     int ifd_type, ofd_type;
  53     pa_mainloop_api* mainloop;
  54
  55     pa_iochannel_cb_t callback;
  56     void*userdata;
  57
  58     int readable;
  59     int writable;
  60     int hungup;
  61
  62     int no_close;
  63
  64     pa_io_event* input_event, *output_event;
  65 };
  66
  67 static void enable_mainloop_sources(pa_iochannel *io) {
  68     assert(io);
  69
  70     if (io->input_event == io->output_event && io->input_event) {
  71         pa_io_event_flags_t f = PA_IO_EVENT_NULL;
  72         assert(io->input_event);
  73
  74         if (!io->readable)
  75             f |= PA_IO_EVENT_INPUT;
  76         if (!io->writable)
  77             f |= PA_IO_EVENT_OUTPUT;
  78
  79         io->mainloop->io_enable(io->input_event, f);
  80     } else {
  81         if (io->input_event)
  82             io->mainloop->io_enable(io->input_event, io->readable ? PA_IO_EVENT_NULL : PA_IO_EVENT_INPUT);
  83         if (io->output_event)
  84             io->mainloop->io_enable(io->output_event, io->writable ? PA_IO_EVENT_NULL : PA_IO_EVENT_OUTPUT);
  85     }
  86 }
  87
  88 static void callback(pa_mainloop_api* m, pa_io_event *e, int fd, pa_io_event_flags_t f, void *userdata) {
  89     pa_iochannel *io = userdata;
  90     int changed = 0;
  91
  92     assert(m);
  93     assert(e);
  94     assert(fd >= 0);
  95     assert(userdata);
  96
  97     if ((f & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) && !io->hungup) {
  98         io->hungup = 1;
  99         changed = 1;
 100     }
 101
 102     if ((f & PA_IO_EVENT_INPUT) && !io->readable) {
 103         io->readable = 1;
 104         changed = 1;
 105         assert(e == io->input_event);
 106     }
 107
 108     if ((f & PA_IO_EVENT_OUTPUT) && !io->writable) {
 109         io->writable = 1;
 110         changed = 1;
 111         assert(e == io->output_event);
 112     }
 113
 114     if (changed) {
 115         enable_mainloop_sources(io);
 116
 117         if (io->callback)
 118             io->callback(io, io->userdata);
 119     }
 120 }
 121
 122 pa_iochannel* pa_iochannel_new(pa_mainloop_api*m, int ifd, int ofd) {
 123     pa_iochannel *io;
 124
 125     assert(m);
 126     assert(ifd >= 0 || ofd >= 0);
 127
 128     io = pa_xnew(pa_iochannel, 1);
 129     io->ifd = ifd;
 130     io->ofd = ofd;
 131     io->ifd_type = io->ofd_type = 0;
 132     io->mainloop = m;
 133
 134     io->userdata = NULL;
 135     io->callback = NULL;
 136     io->readable = 0;
 137     io->writable = 0;
 138     io->hungup = 0;
 139     io->no_close = 0;
 140
 141     io->input_event = io->output_event = NULL;
 142
 143     if (ifd == ofd) {
 144         assert(ifd >= 0);
 145         pa_make_nonblock_fd(io->ifd);
 146         io->input_event = io->output_event = m->io_new(m, ifd, PA_IO_EVENT_INPUT|PA_IO_EVENT_OUTPUT, callback, io);
 147     } else {
 148
 149         if (ifd >= 0) {
 150             pa_make_nonblock_fd(io->ifd);
 151             io->input_event = m->io_new(m, ifd, PA_IO_EVENT_INPUT, callback, io);
 152         }
 153
 154         if (ofd >= 0) {
 155             pa_make_nonblock_fd(io->ofd);
 156             io->output_event = m->io_new(m, ofd, PA_IO_EVENT_OUTPUT, callback, io);
 157         }
 158     }
 159
 160     return io;
 161 }
 162
 163 void pa_iochannel_free(pa_iochannel*io) {
 164     assert(io);
 165
 166     if (io->input_event)
 167         io->mainloop->io_free(io->input_event);
 168
 169     if (io->output_event && (io->output_event != io->input_event))
 170         io->mainloop->io_free(io->output_event);
 171
 172     if (!io->no_close) {
 173         if (io->ifd >= 0)
 174
 175             close(io->ifd);
 176         if (io->ofd >= 0 && io->ofd != io->ifd)
 177             close(io->ofd);
 178     }
 179
 180     pa_xfree(io);
 181 }
 182
 183 int pa_iochannel_is_readable(pa_iochannel*io) {
 184     assert(io);
 185
 186     return io->readable || io->hungup;
 187 }
 188
 189 int pa_iochannel_is_writable(pa_iochannel*io) {
 190     assert(io);
 191
 192     return io->writable && !io->hungup;
 193 }
 194
 195 int pa_iochannel_is_hungup(pa_iochannel*io) {
 196     assert(io);
 197
 198     return io->hungup;
 199 }
 200
 201 ssize_t pa_iochannel_write(pa_iochannel*io, const void*data, size_t l) {
 202     ssize_t r;
 203
 204     assert(io);
 205     assert(data);
 206     assert(l);
 207     assert(io->ofd >= 0);
 208
 209     r = pa_write(io->ofd, data, l, &io->ofd_type);
 210     if (r >= 0) {
 211         io->writable = 0;
 212         enable_mainloop_sources(io);
 213     }
 214
 215     return r;
 216 }
 217
 218 ssize_t pa_iochannel_read(pa_iochannel*io, void*data, size_t l) {
 219     ssize_t r;
 220
 221     assert(io);
 222     assert(data);
 223     assert(io->ifd >= 0);
 224
 225     r = pa_read(io->ifd, data, l, &io->ifd_type);
 226     if (r >= 0) {
 227         io->readable = 0;
 228         enable_mainloop_sources(io);
 229     }
 230
 231     return r;
 232 }
 233
 234 #ifdef SCM_CREDENTIALS
 235
 236 int pa_iochannel_creds_supported(pa_iochannel *io) {
 237     struct sockaddr_un sa;
 238     socklen_t l;
 239
 240     assert(io);
 241     assert(io->ifd >= 0);
 242     assert(io->ofd == io->ifd);
 243
 244     l = sizeof(sa);
 245
 246     if (getsockname(io->ifd, (struct sockaddr*) &sa, &l) < 0)
 247         return 0;
 248
 249     return sa.sun_family == AF_UNIX;
 250 }
 251
 252 int pa_iochannel_creds_enable(pa_iochannel *io) {
 253     int t = 1;
 254
 255     assert(io);
 256     assert(io->ifd >= 0);
 257
 258     if (setsockopt(io->ifd, SOL_SOCKET, SO_PASSCRED, &t, sizeof(t)) < 0) {
 259         pa_log_error("setsockopt(SOL_SOCKET, SO_PASSCRED): %s", pa_cstrerror(errno));
 260         return -1;
 261     }
 262
 263     return 0;
 264 }
 265
 266 ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l) {
 267     ssize_t r;
 268     struct msghdr mh;
 269     struct iovec iov;
 270     uint8_t cmsg_data[CMSG_SPACE(sizeof(struct ucred))];
 271     struct ucred *ucred;
 272     struct cmsghdr *cmsg;
 273
 274     assert(io);
 275     assert(data);
 276     assert(l);
 277     assert(io->ofd >= 0);
 278
 279     memset(&iov, 0, sizeof(iov));
 280     iov.iov_base = (void*) data;
 281     iov.iov_len = l;
 282
 283     memset(cmsg_data, 0, sizeof(cmsg_data));
 284     cmsg = (struct cmsghdr*)  cmsg_data;
 285     cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
 286     cmsg->cmsg_level = SOL_SOCKET;
 287     cmsg->cmsg_type = SCM_CREDENTIALS;
 288
 289     ucred = (struct ucred*) CMSG_DATA(cmsg);
 290     ucred->pid = getpid();
 291     ucred->uid = getuid();
 292     ucred->gid = getgid();
 293
 294     memset(&mh, 0, sizeof(mh));
 295     mh.msg_name = NULL;
 296     mh.msg_namelen = 0;
 297     mh.msg_iov = &iov;
 298     mh.msg_iovlen = 1;
 299     mh.msg_control = cmsg_data;
 300     mh.msg_controllen = sizeof(cmsg_data);
 301     mh.msg_flags = 0;
 302
 303     if ((r = sendmsg(io->ofd, &mh, MSG_NOSIGNAL)) >= 0) {
 304         io->writable = 0;
 305         enable_mainloop_sources(io);
 306     }
 307
 308     return r;
 309 }
 310
 311 ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, struct ucred *ucred, int *creds_valid) {
 312     ssize_t r;
 313     struct msghdr mh;
 314     struct iovec iov;
 315     uint8_t cmsg_data[CMSG_SPACE(sizeof(struct ucred))];
 316
 317     assert(io);
 318     assert(data);
 319     assert(l);
 320     assert(io->ifd >= 0);
 321     assert(ucred);
 322     assert(creds_valid);
 323
 324     memset(&iov, 0, sizeof(iov));
 325     iov.iov_base = data;
 326     iov.iov_len = l;
 327
 328     memset(cmsg_data, 0, sizeof(cmsg_data));
 329
 330     memset(&mh, 0, sizeof(mh));
 331     mh.msg_name = NULL;
 332     mh.msg_namelen = 0;
 333     mh.msg_iov = &iov;
 334     mh.msg_iovlen = 1;
 335     mh.msg_control = cmsg_data;
 336     mh.msg_controllen = sizeof(cmsg_data);
 337     mh.msg_flags = 0;
 338
 339     if ((r = recvmsg(io->ifd, &mh, MSG_NOSIGNAL)) >= 0) {
 340         struct cmsghdr *cmsg;
 341
 342         *creds_valid = 0;
 343
 344         for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) {
 345
 346             if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_CREDENTIALS) {
 347                 assert(cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)));
 348                 memcpy(ucred, CMSG_DATA(cmsg), sizeof(struct ucred));
 349                 *creds_valid = 1;
 350                 break;
 351             }
 352         }
 353
 354         io->readable = 0;
 355         enable_mainloop_sources(io);
 356     }
 357
 358     return r;
 359 }
 360 #else /* SCM_CREDENTIALS */
 361
 362 int pa_iochannel_creds_supported(pa_iochannel *io) {
 363     return 0;
 364 }
 365
 366 int pa_iochannel_creds_enable(pa_iochannel *io) {
 367     return -1;
 368 }
 369
 370 ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l) {
 371     pa_log_error("pa_iochannel_write_with_creds() not supported.");
 372     return -1;
 373 }
 374
 375 ssize_t pa_iochannel_read_with_creds(pa_iochannel*io, void*data, size_t l, struct ucred *ucred, int *creds_valid) {
 376     pa_log_error("pa_iochannel_read_with_creds() not supported.");
 377     return -1;
 378 }
 379
 380 #endif /* SCM_CREDENTIALS */
 381
 382 void pa_iochannel_set_callback(pa_iochannel*io, pa_iochannel_cb_t _callback, void *userdata) {
 383     assert(io);
 384
 385     io->callback = _callback;
 386     io->userdata = userdata;
 387 }
 388
 389 void pa_iochannel_set_noclose(pa_iochannel*io, int b) {
 390     assert(io);
 391
 392     io->no_close = b;
 393 }
 394
 395 void pa_iochannel_socket_peer_to_string(pa_iochannel*io, char*s, size_t l) {
 396     assert(io);
 397     assert(s);
 398     assert(l);
 399
 400     pa_socket_peer_to_string(io->ifd, s, l);
 401 }
 402
 403 int pa_iochannel_socket_set_rcvbuf(pa_iochannel *io, size_t l) {
 404     assert(io);
 405
 406     return pa_socket_set_rcvbuf(io->ifd, l);
 407 }
 408
 409 int pa_iochannel_socket_set_sndbuf(pa_iochannel *io, size_t l) {
 410     assert(io);
 411
 412     return pa_socket_set_sndbuf(io->ofd, l);
 413 }
 414
 415 pa_mainloop_api* pa_iochannel_get_mainloop_api(pa_iochannel *io) {
 416     assert(io);
 417
 418     return io->mainloop;
 419 }