alsa-utils/seq/aseqnet/aseqnet.c

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/*
* network server/client for ALSA sequencer
* ver.0.1
*
* Copyright (C) 1999-2000 Takashi Iwai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <netinet/in.h>
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#include <sys/socket.h>
#include <netdb.h>
#include <sys/asoundlib.h>
#include <getopt.h>
#include <signal.h>
/*
* prototypes
*/
static void usage(void);
static void init_buf(void);
static void init_pollfds(void);
static void close_files(void);
static void init_seq(char *source, char *dest);
static int get_port(char *service);
static void sigterm_exit(int sig);
static void init_server(int port);
static void init_client(char *server, int port);
static void do_loop(void);
static int copy_local_to_remote(void);
static int copy_remote_to_local(int fd);
/*
* default TCP port number
*/
#define DEFAULT_PORT 40002
/*
* local input buffer
*/
static char *readbuf;
static int max_rdlen;
static char *writebuf;
static int cur_wrlen, max_wrlen;
#define MAX_BUF_EVENTS 200
#define MAX_CONNECTION 10
static snd_seq_t *handle;
static struct pollfd *seqifds = NULL;
static struct pollfd *seqofds = NULL;
static struct pollfd *pollfds = NULL;
static int seqifds_count = 0;
static int seqofds_count = 0;
static int pollfds_count = 0;
static int sockfd, netfd[MAX_CONNECTION] = {[0 ... MAX_CONNECTION-1] = -1};
static int max_connection;
static int cur_connected;
static int seq_port;
static int server_mode;
static int verbose = 0;
/*
* main routine
*/
static struct option long_option[] = {
{"port", 1, NULL, 'p'},
{"source", 1, NULL, 's'},
{"dest", 1, NULL, 'd'},
{"help", 0, NULL, 'h'},
{"verbose", 0, NULL, 'v'},
{NULL, 0, NULL, 0},
};
int main(int argc, char **argv)
{
int c;
int port = DEFAULT_PORT;
char *source = NULL, *dest = NULL;
while ((c = getopt_long(argc, argv, "p:s:d:v", long_option, NULL)) != -1) {
switch (c) {
case 'p':
if (isdigit(*optarg))
port = atoi(optarg);
else
port = get_port(optarg);
break;
case 's':
source = optarg;
break;
case 'd':
dest = optarg;
break;
case 'v':
verbose++;
break;
default:
usage();
exit(1);
}
}
signal(SIGINT, sigterm_exit);
signal(SIGTERM, sigterm_exit);
init_buf();
init_seq(source, dest);
if (optind >= argc) {
server_mode = 1;
max_connection = MAX_CONNECTION;
init_pollfds();
init_server(port);
} else {
server_mode = 0;
max_connection = 1;
init_pollfds();
init_client(argv[optind], port);
}
do_loop();
close_files();
return 0;
}
/*
* print usage
*/
static void usage(void)
{
fprintf(stderr, "aseqnet - network client/server on ALSA sequencer\n");
fprintf(stderr, " Copyright (C) 1999 Takashi Iwai\n");
fprintf(stderr, "usage:\n");
fprintf(stderr, " server mode: aseqnet [-options]\n");
fprintf(stderr, " client mode: aseqnet [-options] server_host\n");
fprintf(stderr, "options:\n");
fprintf(stderr, " -p,--port # : sepcify TCP port (digit or service name)\n");
fprintf(stderr, " -s,--source addr : read from given addr (client:port)\n");
fprintf(stderr, " -d,--dest addr : write to given addr (client:port)\n");
fprintf(stderr, " -v, --verbose : print verbose messages\n");
}
/*
* allocate and initialize buffers
*/
static void init_buf(void)
{
max_wrlen = MAX_BUF_EVENTS * sizeof(snd_seq_event_t);
max_rdlen = MAX_BUF_EVENTS * sizeof(snd_seq_event_t);
writebuf = malloc(max_wrlen);
readbuf = malloc(max_rdlen);
if (writebuf == NULL || readbuf == NULL) {
fprintf(stderr, "can't malloc\n");
exit(1);
}
memset(writebuf, 0, max_wrlen);
memset(readbuf, 0, max_rdlen);
cur_wrlen = 0;
}
/*
* allocate and initialize poll array
*/
static void init_pollfds(void)
{
pollfds_count = seqifds_count + seqofds_count + 1 + max_connection;
pollfds = (struct pollfd *)calloc(pollfds_count, sizeof(struct pollfd));
assert(pollfds);
}
/*
* parse command line to client:port
* NB: the given string will be broken.
*/
static int parse_address(snd_seq_t *seq, snd_seq_addr_t *addr, char *arg)
{
char *p;
int client, port;
if ((p = strpbrk(arg, ":.")) == NULL)
return -1;
if ((port = atoi(p + 1)) < 0)
return -1;
addr->port = port;
if (isdigit(*arg)) {
client = atoi(arg);
if (client < 0)
return -1;
addr->client = client;
} else {
/* convert from the name */
snd_seq_client_info_t cinfo;
int len;
*p = 0;
len = strlen(arg);
if (len <= 0)
return -1;
cinfo.client = -1;
while (snd_seq_query_next_client(seq, &cinfo) >= 0) {
if (! strncmp(cinfo.name, arg, len)) {
addr->client = cinfo.client;
return 0;
}
}
return -1; /* not found */
}
return 0;
}
/*
* close all files
*/
static void close_files(void)
{
int i;
if (verbose)
fprintf(stderr, "closing files..\n");
for (i = 0; i < max_connection; i++) {
if (netfd[i] >= 0)
close(netfd[i]);
}
if (sockfd >= 0)
close(sockfd);
}
/*
* initialize sequencer
*/
static void init_seq(char *source, char *dest)
{
snd_seq_addr_t addr;
int err, counti, counto;
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if (snd_seq_open(&handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
perror("snd_seq_open");
exit(1);
}
if (seqifds)
free(seqifds);
if (seqofds)
free(seqofds);
counti = seqifds_count = snd_seq_poll_descriptors_count(handle, POLLIN);
assert(counti > 0);
counto = seqofds_count = snd_seq_poll_descriptors_count(handle, POLLOUT);
assert(counto > 0);
seqifds = (struct pollfd *)calloc(counti, sizeof(struct pollfd));
assert(seqifds);
seqofds = (struct pollfd *)calloc(counto, sizeof(struct pollfd));
assert(seqofds);
err = snd_seq_poll_descriptors(handle, seqifds, counti, POLLIN);
assert(err == counti);
err = snd_seq_poll_descriptors(handle, seqofds, counto, POLLOUT);
assert(err == counto);
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snd_seq_nonblock(handle, 0);
/* set client info */
if (server_mode)
snd_seq_set_client_name(handle, "Net Server");
else
snd_seq_set_client_name(handle, "Net Client");
/* create a port */
seq_port = snd_seq_create_simple_port(handle, "Network",
SND_SEQ_PORT_CAP_READ |
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_READ |
SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_MIDI_GENERIC);
if (seq_port < 0) {
perror("create seq port");
exit(1);
}
if (verbose)
fprintf(stderr, "sequencer opened: %d:%d\n",
snd_seq_client_id(handle), seq_port);
/* explicit subscriptions */
if (source) {
/* read subscription */
if (parse_address(handle, &addr, source) < 0) {
fprintf(stderr, "invalid source address %s\n", source);
exit(1);
}
if (snd_seq_connect_from(handle, seq_port, addr.client, addr.port)) {
perror("read subscription");
exit(1);
}
}
if (dest) {
/* write subscription */
if (parse_address(handle, &addr, dest) < 0) {
fprintf(stderr, "invalid destination address %s\n", dest);
exit(1);
}
if (snd_seq_connect_to(handle, seq_port, addr.client, addr.port)) {
perror("write subscription");
exit(1);
}
}
}
/*
* convert from string to TCP port number
*/
static int get_port(char *service)
{
struct servent *sp;
if ((sp = getservbyname(service, "tcp")) == NULL){
fprintf(stderr, "service '%s' is not found in /etc/services\n", service);
return -1;
}
return sp->s_port;
}
/*
* signal handler
*/
static void sigterm_exit(int sig)
{
close_files();
exit(1);
}
/*
* initialize network server
*/
static void init_server(int port)
{
int i;
int curstate = 1;
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("create socket");
exit(1);
}
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &curstate, sizeof(curstate));
/* the return value is ignored.. */
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if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("can't bind");
exit(1);
}
if (listen(sockfd, 5) < 0) {
perror("can't listen");
exit(1);
}
cur_connected = 0;
for (i = 0; i < max_connection; i++)
netfd[i] = -1;
}
/*
* start connection on server
*/
static void start_connection(void)
{
struct sockaddr_in addr;
int i;
int addr_len;
for (i = 0; i < max_connection; i++) {
if (netfd[i] < 0)
break;
}
if (i >= max_connection) {
fprintf(stderr, "too many connections!\n");
exit(1);
}
memset(&addr, 0, sizeof(addr));
addr_len = sizeof(addr);
netfd[i] = accept(sockfd, (struct sockaddr *)&addr, &addr_len);
if (netfd[i] < 0) {
perror("accept");
exit(1);
}
if (verbose)
fprintf(stderr, "accepted[%d]\n", netfd[i]);
cur_connected++;
}
/*
* initialize network client
*/
static void init_client(char *server, int port)
{
struct sockaddr_in addr;
struct hostent *host;
int curstate = 1;
int fd;
if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
perror("create socket");
exit(1);
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &curstate, sizeof(curstate)) < 0) {
perror("setsockopt");
exit(1);
}
if ((host = gethostbyname(server)) == NULL){
fprintf(stderr,"can't get address %s\n", server);
exit(1);
}
addr.sin_port = htons(port);
addr.sin_family = AF_INET;
memcpy(&addr.sin_addr, host->h_addr, host->h_length);
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if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("connect");
exit(1);
}
if (verbose)
fprintf(stderr, "ok.. connected\n");
netfd[0] = fd;
cur_connected = 1;
}
/*
* event loop
*/
static void do_loop(void)
{
int i, rc, width;
int seqifd_ptr, sockfd_ptr = -1, netfd_ptr;
for (;;) {
memset(pollfds, 0, pollfds_count * sizeof(struct pollfd));
seqifd_ptr = 0;
memcpy(pollfds, seqifds, width = seqifds_count);
if (server_mode) {
sockfd_ptr = width;
pollfds[width].fd = sockfd;
pollfds[width].events = POLLIN;
width++;
}
netfd_ptr = width;
for (i = 0; i < max_connection; i++) {
if (netfd[i] >= 0) {
pollfds[width].fd = netfd[i];
pollfds[width].events = POLLIN;
width++;
}
}
rc = poll(pollfds, width, -1);
if (rc <= 0)
exit(1);
if (server_mode) {
if (pollfds[sockfd_ptr].revents & (POLLIN|POLLOUT))
start_connection();
}
for (i = 0; i < seqifds_count; i++)
if (pollfds[seqifd_ptr + i].revents & (POLLIN|POLLOUT)) {
if (copy_local_to_remote())
return;
break;
}
for (i = 0; i < max_connection; i++) {
if (netfd[i] < 0)
continue;
if (pollfds[netfd_ptr + i].revents & (POLLIN|POLLOUT)) {
if (copy_remote_to_local(netfd[i])) {
netfd[i] = -1;
cur_connected--;
if (cur_connected <= 0)
return;
}
}
}
}
}
/*
* flush write buffer - send data to the socket
*/
static void flush_writebuf(void)
{
if (cur_wrlen) {
int i;
for (i = 0; i < max_connection; i++) {
if (netfd[i] >= 0)
write(netfd[i], writebuf, cur_wrlen);
}
cur_wrlen = 0;
}
}
/*
* get space from write buffer
*/
static char *get_writebuf(int len)
{
char *buf;
if (cur_wrlen + len >= max_wrlen)
flush_writebuf();
buf = writebuf + cur_wrlen;
cur_wrlen += len;
return buf;
}
/*
* copy events from sequencer to port(s)
*/
static int copy_local_to_remote(void)
{
int rc;
snd_seq_event_t *ev;
char *buf;
while ((rc = snd_seq_event_input(handle, &ev)) >= 0 && ev) {
if (ev->type >= SND_SEQ_EVENT_CLIENT_START &&
! snd_seq_ev_is_variable_type(ev)) {
snd_seq_free_event(ev);
continue;
}
if (snd_seq_ev_is_variable(ev)) {
int len;
len = sizeof(snd_seq_event_t) + ev->data.ext.len;
buf = get_writebuf(len);
memcpy(buf, ev, sizeof(snd_seq_event_t));
memcpy(buf + sizeof(snd_seq_event_t), ev->data.ext.ptr, ev->data.ext.len);
} else {
buf = get_writebuf(sizeof(snd_seq_event_t));
memcpy(buf, ev, sizeof(snd_seq_event_t));
}
snd_seq_free_event(ev);
}
flush_writebuf();
return 0;
}
/*
* copy events from a port to sequencer
*/
static int copy_remote_to_local(int fd)
{
int count;
char *buf;
snd_seq_event_t *ev;
count = read(fd, readbuf, MAX_BUF_EVENTS * sizeof(snd_seq_event_t));
buf = readbuf;
if (count == 0) {
if (verbose)
fprintf(stderr, "disconnected\n");
return 1;
}
while (count > 0) {
ev = (snd_seq_event_t*)buf;
buf += sizeof(snd_seq_event_t);
count -= sizeof(snd_seq_event_t);
if (snd_seq_ev_is_variable(ev) && ev->data.ext.len > 0) {
ev->data.ext.ptr = buf;
buf += ev->data.ext.len;
count -= ev->data.ext.len;
}
snd_seq_ev_set_direct(ev);
snd_seq_ev_set_source(ev, seq_port);
snd_seq_ev_set_subs(ev);
snd_seq_event_output(handle, ev);
}
snd_seq_drain_output(handle);
return 0;
}