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/* $OpenBSD: mio_thru.c,v 1.6 2009/10/22 22:26:49 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "amsg.h"
#include "mio_priv.h"
#define THRU_SOCKET "midithru"
struct thru_hdl {
struct mio_hdl mio;
int fd;
};
static void thru_close(struct mio_hdl *);
static size_t thru_read(struct mio_hdl *, void *, size_t);
static size_t thru_write(struct mio_hdl *, const void *, size_t);
static int thru_pollfd(struct mio_hdl *, struct pollfd *, int);
static int thru_revents(struct mio_hdl *, struct pollfd *);
static struct mio_ops thru_ops = {
thru_close,
thru_write,
thru_read,
thru_pollfd,
thru_revents,
};
struct mio_hdl *
thru_open(const char *str, char *sock, unsigned mode, int nbio)
{
extern char *__progname;
struct amsg msg;
int s, n, todo;
unsigned char *data;
struct thru_hdl *hdl;
struct sockaddr_un ca;
socklen_t len = sizeof(struct sockaddr_un);
uid_t uid;
uid = geteuid();
if (strchr(str, '/') != NULL)
return NULL;
snprintf(ca.sun_path, sizeof(ca.sun_path),
"/tmp/aucat-%u/%s%s", uid, sock, str);
ca.sun_family = AF_UNIX;
hdl = malloc(sizeof(struct thru_hdl));
if (hdl == NULL)
return NULL;
mio_create(&hdl->mio, &thru_ops, mode, nbio);
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0)
goto bad_free;
while (connect(s, (struct sockaddr *)&ca, len) < 0) {
if (errno == EINTR)
continue;
DPERROR("thru_open: connect");
goto bad_connect;
}
if (fcntl(s, F_SETFD, FD_CLOEXEC) < 0) {
DPERROR("FD_CLOEXEC");
goto bad_connect;
}
hdl->fd = s;
/*
* say hello to server
*/
AMSG_INIT(&msg);
msg.cmd = AMSG_HELLO;
msg.u.hello.version = AMSG_VERSION;
msg.u.hello.proto = 0;
if (mode & MIO_IN)
msg.u.hello.proto |= AMSG_MIDIIN;
if (mode & MIO_OUT)
msg.u.hello.proto |= AMSG_MIDIOUT;
strlcpy(msg.u.hello.opt, "default", sizeof(msg.u.hello.opt));
strlcpy(msg.u.hello.who, __progname, sizeof(msg.u.hello.who));
n = write(s, &msg, sizeof(struct amsg));
if (n < 0) {
DPERROR("thru_open");
goto bad_connect;
}
if (n != sizeof(struct amsg)) {
DPRINTF("thru_open: short write\n");
goto bad_connect;
}
todo = sizeof(struct amsg);
data = (unsigned char *)&msg;
while (todo > 0) {
n = read(s, data, todo);
if (n < 0) {
DPERROR("thru_open");
goto bad_connect;
}
if (n == 0) {
DPRINTF("thru_open: eof\n");
goto bad_connect;
}
todo -= n;
data += n;
}
if (msg.cmd != AMSG_ACK) {
DPRINTF("thru_open: proto error\n");
goto bad_connect;
}
if (nbio && fcntl(hdl->fd, F_SETFL, O_NONBLOCK) < 0) {
DPERROR("thru_open: fcntl(NONBLOCK)");
goto bad_connect;
}
return (struct mio_hdl *)hdl;
bad_connect:
while (close(s) < 0 && errno == EINTR)
; /* retry */
bad_free:
free(hdl);
return NULL;
}
struct mio_hdl *
mio_open_thru(const char *str, unsigned mode, int nbio)
{
return thru_open(str, "midithru", mode, nbio);
}
struct mio_hdl *
mio_open_aucat(const char *str, unsigned mode, int nbio)
{
return thru_open(str, "softaudio", mode, nbio);
}
static void
thru_close(struct mio_hdl *sh)
{
struct thru_hdl *hdl = (struct thru_hdl *)sh;
int rc;
do {
rc = close(hdl->fd);
} while (rc < 0 && errno == EINTR);
free(hdl);
}
static size_t
thru_read(struct mio_hdl *sh, void *buf, size_t len)
{
struct thru_hdl *hdl = (struct thru_hdl *)sh;
ssize_t n;
while ((n = read(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("thru_read: read");
hdl->mio.eof = 1;
}
return 0;
}
if (n == 0) {
DPRINTF("thru_read: eof\n");
hdl->mio.eof = 1;
return 0;
}
return n;
}
static size_t
thru_write(struct mio_hdl *sh, const void *buf, size_t len)
{
struct thru_hdl *hdl = (struct thru_hdl *)sh;
ssize_t n;
while ((n = write(hdl->fd, buf, len)) < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
DPERROR("thru_write: write");
hdl->mio.eof = 1;
return 0;
}
return 0;
}
return n;
}
static int
thru_pollfd(struct mio_hdl *sh, struct pollfd *pfd, int events)
{
struct thru_hdl *hdl = (struct thru_hdl *)sh;
pfd->fd = hdl->fd;
pfd->events = events;
return 1;
}
static int
thru_revents(struct mio_hdl *sh, struct pollfd *pfd)
{
return pfd->revents;
}
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