mirror of https://github.com/ericonr/sndio.git
542 lines
11 KiB
C
542 lines
11 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <netdb.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "aucat.h"
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#include "debug.h"
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#include "bsd-compat.h"
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#ifndef USE_ARC4RANDOM
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#ifndef DEV_RANDOM
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#define DEV_RANDOM "/dev/arandom"
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#endif
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#endif
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/*
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* read a message, return 0 if not completed
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*/
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int
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aucat_rmsg(struct aucat *hdl, int *eof)
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{
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ssize_t n;
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unsigned char *data;
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if (hdl->rstate != RSTATE_MSG) {
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DPRINTF("aucat_rmsg: bad state\n");
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abort();
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}
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while (hdl->rtodo > 0) {
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data = (unsigned char *)&hdl->rmsg;
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data += sizeof(struct amsg) - hdl->rtodo;
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while ((n = read(hdl->fd, data, hdl->rtodo)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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*eof = 1;
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DPERROR("aucat_rmsg: read");
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}
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return 0;
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}
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if (n == 0) {
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DPRINTF("aucat_rmsg: eof\n");
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*eof = 1;
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return 0;
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}
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hdl->rtodo -= n;
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}
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if (ntohl(hdl->rmsg.cmd) == AMSG_DATA) {
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hdl->rtodo = ntohl(hdl->rmsg.u.data.size);
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hdl->rstate = RSTATE_DATA;
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} else {
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hdl->rtodo = sizeof(struct amsg);
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hdl->rstate = RSTATE_MSG;
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}
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return 1;
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}
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/*
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* write a message, return 0 if not completed
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*/
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int
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aucat_wmsg(struct aucat *hdl, int *eof)
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{
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ssize_t n;
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unsigned char *data;
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if (hdl->wstate == WSTATE_IDLE)
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hdl->wstate = WSTATE_MSG;
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hdl->wtodo = sizeof(struct amsg);
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if (hdl->wstate != WSTATE_MSG) {
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DPRINTF("aucat_wmsg: bad state\n");
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abort();
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}
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while (hdl->wtodo > 0) {
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data = (unsigned char *)&hdl->wmsg;
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data += sizeof(struct amsg) - hdl->wtodo;
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while ((n = write(hdl->fd, data, hdl->wtodo)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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*eof = 1;
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DPERROR("aucat_wmsg: write");
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}
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return 0;
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}
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hdl->wtodo -= n;
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}
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if (ntohl(hdl->wmsg.cmd) == AMSG_DATA) {
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hdl->wtodo = ntohl(hdl->wmsg.u.data.size);
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hdl->wstate = WSTATE_DATA;
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} else {
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hdl->wtodo = 0xdeadbeef;
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hdl->wstate = WSTATE_IDLE;
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}
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return 1;
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}
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size_t
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aucat_rdata(struct aucat *hdl, void *buf, size_t len, int *eof)
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{
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ssize_t n;
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if (hdl->rstate != RSTATE_DATA) {
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DPRINTF("aucat_rdata: bad state\n");
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abort();
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}
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if (len > hdl->rtodo)
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len = hdl->rtodo;
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while ((n = read(hdl->fd, buf, len)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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*eof = 1;
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DPERROR("aucat_rdata: read");
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}
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return 0;
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}
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if (n == 0) {
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DPRINTF("aucat_rdata: eof\n");
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*eof = 1;
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return 0;
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}
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hdl->rtodo -= n;
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if (hdl->rtodo == 0) {
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hdl->rstate = RSTATE_MSG;
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hdl->rtodo = sizeof(struct amsg);
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}
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DPRINTF("aucat_rdata: read: n = %zd\n", n);
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return n;
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}
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size_t
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aucat_wdata(struct aucat *hdl, const void *buf, size_t len, unsigned wbpf, int *eof)
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{
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ssize_t n;
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switch (hdl->wstate) {
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case WSTATE_IDLE:
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if (len > AMSG_DATAMAX)
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len = AMSG_DATAMAX;
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len -= len % wbpf;
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if (len == 0)
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len = wbpf;
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hdl->wmsg.cmd = htonl(AMSG_DATA);
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hdl->wmsg.u.data.size = htonl(len);
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hdl->wtodo = sizeof(struct amsg);
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hdl->wstate = WSTATE_MSG;
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/* FALLTHROUGH */
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case WSTATE_MSG:
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if (!aucat_wmsg(hdl, eof))
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return 0;
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}
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if (len > hdl->wtodo)
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len = hdl->wtodo;
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if (len == 0) {
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DPRINTF("aucat_wdata: len == 0\n");
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abort();
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}
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while ((n = write(hdl->fd, buf, len)) < 0) {
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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*eof = 1;
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DPERROR("aucat_wdata: write");
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}
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return 0;
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}
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DPRINTF("aucat_wdata: write: n = %zd\n", n);
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hdl->wtodo -= n;
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if (hdl->wtodo == 0) {
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hdl->wstate = WSTATE_IDLE;
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hdl->wtodo = 0xdeadbeef;
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}
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return n;
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}
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int
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aucat_mkcookie(unsigned char *cookie)
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{
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struct stat sb;
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char buf[PATH_MAX], tmp[PATH_MAX], *path;
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ssize_t len;
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#ifndef USE_ARC4RANDOM
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ssize_t n;
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#endif
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int fd;
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/*
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* try to load the cookie
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*/
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path = issetugid() ? NULL : getenv("AUCAT_COOKIE");
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if (path == NULL) {
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path = issetugid() ? NULL : getenv("HOME");
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if (path == NULL)
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goto bad_gen;
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snprintf(buf, PATH_MAX, "%s/.aucat_cookie", path);
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path = buf;
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}
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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if (errno != ENOENT)
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DPERROR(path);
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goto bad_gen;
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}
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if (fstat(fd, &sb) < 0) {
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DPERROR(path);
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goto bad_close;
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}
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if (sb.st_mode & 0077) {
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DPRINTF("%s has wrong permissions\n", path);
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goto bad_close;
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}
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len = read(fd, cookie, AMSG_COOKIELEN);
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if (len < 0) {
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DPERROR(path);
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goto bad_close;
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}
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if (len != AMSG_COOKIELEN) {
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DPRINTF("%s: short read\n", path);
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goto bad_close;
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}
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close(fd);
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return 1;
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bad_close:
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close(fd);
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bad_gen:
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/*
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* generate a new cookie
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*/
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#ifdef USE_ARC4RANDOM
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arc4random_buf(cookie, AMSG_COOKIELEN);
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#else
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fd = open(DEV_RANDOM, O_RDONLY);
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if (fd < 0) {
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DPERROR(DEV_RANDOM);
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return 0;
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}
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len = AMSG_COOKIELEN;
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while (len > 0) {
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n = read(fd, cookie, len);
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if (n < 0) {
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DPERROR(DEV_RANDOM);
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close(fd);
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return 0;
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}
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if (n == 0) {
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close(fd);
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return 0;
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}
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cookie += n;
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len -= n;
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}
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close(fd);
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#endif
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/*
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* try to save the cookie
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*/
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if (path == NULL)
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return 1;
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if (strlcpy(tmp, path, PATH_MAX) >= PATH_MAX ||
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strlcat(tmp, ".XXXXXXXX", PATH_MAX) >= PATH_MAX) {
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DPRINTF("%s: too long\n", path);
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return 1;
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}
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fd = mkstemp(tmp);
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if (fd < 0) {
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DPERROR(tmp);
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return 1;
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}
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if (write(fd, cookie, AMSG_COOKIELEN) < 0) {
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DPERROR(tmp);
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unlink(tmp);
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close(fd);
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return 1;
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}
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close(fd);
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if (rename(tmp, path) < 0) {
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DPERROR(tmp);
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unlink(tmp);
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}
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return 1;
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}
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int
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aucat_connect_tcp(struct aucat *hdl, char *host, char *unit, int isaudio)
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{
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int s, error, opt;
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struct addrinfo *ailist, *ai, aihints;
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unsigned port;
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char serv[NI_MAXSERV];
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if (sscanf(unit, "%u", &port) != 1) {
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DPRINTF("%s: bad unit number\n", unit);
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return 0;
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}
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if (isaudio)
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port += AUCAT_PORT;
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else
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port += MIDICAT_PORT;
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snprintf(serv, sizeof(serv), "%u", port);
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memset(&aihints, 0, sizeof(struct addrinfo));
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aihints.ai_socktype = SOCK_STREAM;
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aihints.ai_protocol = IPPROTO_TCP;
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error = getaddrinfo(host, serv, &aihints, &ailist);
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if (error) {
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DPRINTF("%s: %s\n", host, gai_strerror(error));
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return 0;
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}
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s = -1;
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for (ai = ailist; ai != NULL; ai = ai->ai_next) {
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s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (s < 0) {
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DPERROR("socket");
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continue;
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}
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if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
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DPERROR("connect");
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close(s);
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s = -1;
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continue;
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}
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break;
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}
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freeaddrinfo(ailist);
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if (s < 0)
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return 0;
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opt = 1;
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if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(int)) < 0) {
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DPERROR("setsockopt");
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close(s);
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return 0;
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}
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hdl->fd = s;
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return 1;
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}
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int
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aucat_connect_un(struct aucat *hdl, char *unit, int isaudio)
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{
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struct sockaddr_un ca;
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socklen_t len = sizeof(struct sockaddr_un);
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char *sock;
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uid_t uid;
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int s;
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uid = geteuid();
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sock = isaudio ? AUCAT_PATH : MIDICAT_PATH;
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snprintf(ca.sun_path, sizeof(ca.sun_path),
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"/tmp/aucat-%u/%s%s", uid, sock, unit);
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ca.sun_family = AF_UNIX;
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s = socket(AF_UNIX, SOCK_STREAM, 0);
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if (s < 0)
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return 0;
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while (connect(s, (struct sockaddr *)&ca, len) < 0) {
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if (errno == EINTR)
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continue;
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DPERROR(ca.sun_path);
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/* try shared server */
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snprintf(ca.sun_path, sizeof(ca.sun_path),
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"/tmp/aucat/%s%s", sock, unit);
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while (connect(s, (struct sockaddr *)&ca, len) < 0) {
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if (errno == EINTR)
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continue;
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DPERROR(ca.sun_path);
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close(s);
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return 0;
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}
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break;
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}
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hdl->fd = s;
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return 1;
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}
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int
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aucat_open(struct aucat *hdl, const char *str, unsigned mode, int isaudio)
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{
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extern char *__progname;
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int eof, hashost;
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char unit[4], *sep, *opt;
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char host[NI_MAXHOST];
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if (str == NULL)
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str = "0";
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sep = strchr(str, '/');
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if (sep == NULL) {
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hashost = 0;
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} else {
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if (sep - str >= sizeof(host)) {
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DPRINTF("aucat_open: %s: host too long\n", str);
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return 0;
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}
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memcpy(host, str, sep - str);
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host[sep - str] = '\0';
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hashost = 1;
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str = sep + 1;
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}
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sep = strchr(str, '.');
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if (sep == NULL) {
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opt = "default";
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strlcpy(unit, str, sizeof(unit));
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} else {
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opt = sep + 1;
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if (sep - str >= sizeof(unit)) {
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DPRINTF("aucat_init: %s: too long\n", str);
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return 0;
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}
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strlcpy(unit, str, opt - str);
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}
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DPRINTF("aucat_init: trying %s -> %s.%s\n", str, unit, opt);
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if (hashost) {
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if (!aucat_connect_tcp(hdl, host, unit, isaudio))
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return 0;
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} else {
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if (!aucat_connect_un(hdl, unit, isaudio))
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return 0;
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}
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if (fcntl(hdl->fd, F_SETFD, FD_CLOEXEC) < 0) {
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DPERROR("FD_CLOEXEC");
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goto bad_connect;
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}
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hdl->rstate = RSTATE_MSG;
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hdl->rtodo = sizeof(struct amsg);
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hdl->wstate = WSTATE_IDLE;
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hdl->wtodo = 0xdeadbeef;
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/*
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* say hello to server
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*/
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AMSG_INIT(&hdl->wmsg);
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hdl->wmsg.cmd = htonl(AMSG_AUTH);
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if (!aucat_mkcookie(hdl->wmsg.u.auth.cookie))
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goto bad_connect;
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hdl->wtodo = sizeof(struct amsg);
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if (!aucat_wmsg(hdl, &eof))
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goto bad_connect;
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AMSG_INIT(&hdl->wmsg);
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hdl->wmsg.cmd = htonl(AMSG_HELLO);
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hdl->wmsg.u.hello.version = AMSG_VERSION;
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hdl->wmsg.u.hello.mode = htons(mode);
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strlcpy(hdl->wmsg.u.hello.who, __progname,
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sizeof(hdl->wmsg.u.hello.who));
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strlcpy(hdl->wmsg.u.hello.opt, opt,
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sizeof(hdl->wmsg.u.hello.opt));
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hdl->wtodo = sizeof(struct amsg);
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if (!aucat_wmsg(hdl, &eof))
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goto bad_connect;
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hdl->rtodo = sizeof(struct amsg);
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if (!aucat_rmsg(hdl, &eof)) {
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DPRINTF("aucat_init: mode refused\n");
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goto bad_connect;
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}
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if (ntohl(hdl->rmsg.cmd) != AMSG_ACK) {
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DPRINTF("aucat_init: protocol err\n");
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goto bad_connect;
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}
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return 1;
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bad_connect:
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while (close(hdl->fd) < 0 && errno == EINTR)
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; /* retry */
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return 0;
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}
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void
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aucat_close(struct aucat *hdl, int eof)
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{
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char dummy[1];
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if (!eof) {
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AMSG_INIT(&hdl->wmsg);
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hdl->wmsg.cmd = htonl(AMSG_BYE);
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hdl->wtodo = sizeof(struct amsg);
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if (!aucat_wmsg(hdl, &eof))
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goto bad_close;
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while (read(hdl->fd, dummy, 1) < 0 && errno == EINTR)
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; /* nothing */
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}
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bad_close:
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while (close(hdl->fd) < 0 && errno == EINTR)
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; /* nothing */
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}
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int
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aucat_setfl(struct aucat *hdl, int nbio, int *eof)
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{
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if (fcntl(hdl->fd, F_SETFL, nbio ? O_NONBLOCK : 0) < 0) {
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DPERROR("aucat_setfl: fcntl");
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*eof = 1;
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return 0;
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}
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return 1;
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}
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int
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aucat_pollfd(struct aucat *hdl, struct pollfd *pfd, int events)
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{
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if (hdl->rstate == RSTATE_MSG)
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|
events |= POLLIN;
|
|
pfd->fd = hdl->fd;
|
|
pfd->events = events;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
aucat_revents(struct aucat *hdl, struct pollfd *pfd)
|
|
{
|
|
int revents = pfd->revents;
|
|
|
|
DPRINTF("aucat_revents: revents: %x\n", revents);
|
|
return revents;
|
|
}
|