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/*
* Copyright 2004-2005 Timo Hirvonen
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include "server.h"
#include "prog.h"
#include "command_mode.h"
#include "options.h"
#include "debug.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int server_socket;
static union {
struct sockaddr sa;
struct sockaddr_un un;
struct sockaddr_in in;
} addr;
#define MAX_CLIENTS 10
static void read_commands(int fd)
{
char buf[1024];
int pos = 0;
int authenticated = addr.sa.sa_family == AF_UNIX;
while (1) {
int rc, s, i;
rc = read(fd, buf + pos, sizeof(buf) - pos);
if (rc == -1) {
break;
}
if (rc == 0) {
break;
}
pos += rc;
s = 0;
for (i = 0; i < pos; i++) {
const char *line;
if (buf[i] != '\n')
continue;
buf[i] = 0;
line = buf + s;
s = i + 1;
if (!authenticated) {
if (!server_password) {
d_print("password is unset, tcp/ip disabled\n");
return;
}
authenticated = !strcmp(line, server_password);
if (!authenticated) {
d_print("authentication failed\n");
return;
}
continue;
}
run_command(line);
}
memmove(buf, buf + s, pos - s);
pos -= s;
}
}
int server_serve(void)
{
struct sockaddr saddr;
socklen_t saddr_size = sizeof(saddr);
int fd;
fd = accept(server_socket, &saddr, &saddr_size);
if (fd == -1) {
return -1;
}
/* unix connection is secure, other insecure */
run_only_safe_commands = addr.sa.sa_family != AF_UNIX;
read_commands(fd);
run_only_safe_commands = 0;
close(fd);
return 0;
}
static void gethostbyname_failed(void)
{
const char *error = "Unknown error.";
switch (h_errno) {
case HOST_NOT_FOUND:
case NO_ADDRESS:
error = "Host not found.";
break;
case NO_RECOVERY:
error = "A non-recoverable name server error.";
break;
case TRY_AGAIN:
error = "A temporary error occurred on an authoritative name server.";
break;
}
die("gethostbyname: %s\n", error);
}
void server_init(char *address)
{
int port = DEFAULT_PORT;
int addrlen;
if (strchr(address, '/')) {
addr.sa.sa_family = AF_UNIX;
strncpy(addr.un.sun_path, address, sizeof(addr.un.sun_path) - 1);
addrlen = sizeof(struct sockaddr_un);
} else {
char *s = strchr(address, ':');
struct hostent *hent;
if (s) {
*s++ = 0;
port = atoi(s);
}
hent = gethostbyname(address);
if (!hent)
gethostbyname_failed();
addr.sa.sa_family = hent->h_addrtype;
switch (addr.sa.sa_family) {
case AF_INET:
memcpy(&addr.in.sin_addr, hent->h_addr_list[0], hent->h_length);
addr.in.sin_port = htons(port);
addrlen = sizeof(addr.in);
break;
default:
die("unsupported address type\n");
}
}
server_socket = socket(addr.sa.sa_family, SOCK_STREAM, 0);
if (server_socket == -1)
die_errno("socket");
if (bind(server_socket, &addr.sa, addrlen) == -1) {
int sock;
if (errno != EADDRINUSE)
die_errno("bind");
/* address already in use */
if (addr.sa.sa_family != AF_UNIX)
die("cmus is already listening on %s:%d\n", address, port);
/* try to connect to server */
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1)
die_errno("socket");
if (connect(sock, &addr.sa, addrlen) == -1) {
if (errno != ENOENT && errno != ECONNREFUSED)
die_errno("connect");
/* server not running => dead socket */
/* try to remove dead socket */
if (unlink(addr.un.sun_path) == -1 && errno != ENOENT)
die_errno("unlink");
if (bind(server_socket, &addr.sa, addrlen) == -1)
die_errno("bind");
} else {
/* server already running */
die("cmus is already listening on socket %s\n", address);
}
close(sock);
}
if (listen(server_socket, MAX_CLIENTS) == -1)
die_errno("listen");
}
void server_exit(void)
{
close(server_socket);
if (addr.sa.sa_family == AF_UNIX)
unlink(addr.un.sun_path);
}
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