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

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