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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <string.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "input_conn.h"
#include "input.h"
#include "run.h"
#include "cmd_parser.h"
static struct input tcp_server;
int tcp_server_started;
static struct input uds_server;
int uds_server_started;
/* Active clients */
struct client_conn {
struct input input;
int enabled;
int n_buf;
char buf[32768];
};
struct client_conn clients[32];
static int start_listen_tcp(void)
{
struct sockaddr_in server;
int ret, sock;
int optval = 1;
memset(&server, 0, sizeof(server));
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1)
return -1;
server.sin_family = AF_INET;
server.sin_port = ntohs(8474);
server.sin_addr.s_addr = ntohl(INADDR_ANY);
ret = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(int));
if (ret)
return -1;
if (bind(sock, (struct sockaddr *) &server, sizeof(server)) == -1)
return -1;
if (listen(sock, 1) == -1)
return -1;
return sock;
}
static int start_listen_uds(void)
{
int sock;
struct sockaddr_un server = {
.sun_path = "/tmp/prox.sock",
.sun_family = AF_UNIX
};
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1)
return -1;
/* Unlink can fail, i.e. when /tmp/prox.sock does not
exists. This is not fatal. */
unlink(server.sun_path);
if (bind(sock, (struct sockaddr *) &server, sizeof(server)) == -1)
return -1;
if (listen(sock, 1) == -1)
return -1;
return sock;
}
static void write_client(struct input *input, const char *buf, size_t len)
{
int ret;
while ((ret = write(input->fd, buf, len)) != (int)len) {
buf += ret;
len -= ret;
}
}
static void handle_client(struct input* client_input)
{
char cur[1024];
size_t i;
int ret;
struct client_conn *c = NULL;
/* Get the client structure that uses this input */
for (i = 0; i < sizeof(clients)/sizeof(clients[0]); ++i) {
if (&clients[i].input == client_input) {
c = &clients[i];
break;
}
}
/* handle_client function called non-tcp client */
if (c == NULL)
return ;
ret = read(c->input.fd, cur, sizeof(cur));
if (ret == 0) {
c->enabled = 0;
unreg_input(&c->input);
return ;
}
/* Scan in data until \n (\r skipped if followed by \n) */
for (int i = 0; i < ret; ++i) {
if (cur[i] == '\r' && i + 1 < ret && cur[i + 1] == '\n')
continue;
if (cur[i] == '\n') {
c->buf[c->n_buf] = 0;
if (c->n_buf)
cmd_parser_parse(c->buf, client_input);
c->n_buf = 0;
}
else if (c->n_buf + 1 < (int)sizeof(c->buf))
c->buf[c->n_buf++] = cur[i];
else
c->n_buf = 0;
}
}
static void handle_new_client(struct input* server)
{
size_t i;
int new_client = accept(server->fd, NULL, NULL);
for (i = 0; i < sizeof(clients)/sizeof(clients[0]); ++i) {
if (clients[i].enabled == 0) {
break;
}
}
if (i == sizeof(clients)/sizeof(clients[0])) {
close(new_client);
return ;
}
clients[i].enabled = 1;
clients[i].n_buf = 0;
clients[i].input.fd = new_client;
clients[i].input.reply = server->reply;
clients[i].input.proc_input = handle_client;
reg_input(&clients[i].input);
}
int reg_input_tcp(void)
{
int fd;
if (tcp_server_started)
return -1;
if ((fd = start_listen_tcp()) < 0)
return -1;
tcp_server.fd = fd;
tcp_server.proc_input = handle_new_client;
tcp_server.reply = write_client;
if (reg_input(&tcp_server) != 0) {
close(fd);
return -1;
}
tcp_server_started = 1;
return 0;
}
int reg_input_uds(void)
{
int fd;
if (uds_server_started)
return -1;
if ((fd = start_listen_uds()) < 0)
return -1;
uds_server.fd = fd;
uds_server.proc_input = handle_new_client;
uds_server.reply = write_client;
if (reg_input(&uds_server) != 0) {
close(fd);
return -1;
}
uds_server_started = 1;
return 0;
}
void unreg_input_tcp(void)
{
if (!tcp_server_started)
return;
tcp_server_started = 0;
close(tcp_server.fd);
unreg_input(&tcp_server);
}
void unreg_input_uds(void)
{
if (!uds_server_started)
return;
uds_server_started = 0;
close(tcp_server.fd);
unreg_input(&tcp_server);
}
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