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// $Id$
// Barebone TCP socket server daemon based on libevent 2.0
// Copyright (c) 2011, Chen-Yu Tsai <wens@csie.org>
// All rights reserved.
// This is a simple TCP/IP server daemon based on libevent 2.0.
// This program does not depend on anything other than libevent 2.0.
// Without additional code linked in, this program alone will behave as an
// echo server.
//
// You can supply your client_read_cb(), client_event_cb(), setup_client(), or
// setup_program() functions to modify the behavior of the server.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <event2/event.h>
#include <event2/buffer.h>
#include <event2/bufferevent.h>
#include <event2/util.h>
#include <event2/listener.h>
#include "server.h"
static const struct timeval timeout = {600, 0};
const struct timeval *common_timeout = &timeout;
int
split_args(char *line, char ***argp)
{
int argc = 0;
char *p, **argv;
if ((argv = calloc(MAX_ARGS + 1, sizeof(char *))) == NULL)
return -1;
while ((p = strsep(&line, " \t\r\n")) != NULL) {
argv[argc++] = p;
if (argc == MAX_ARGS)
break;
}
argv = realloc(argv, (argc + 1) * sizeof(char *));
*argp = argv;
return argc;
}
void __attribute__((weak))
client_read_cb(struct bufferevent *bev, void *ctx)
{
bufferevent_write_buffer(bev, bufferevent_get_input(bev));
}
void __attribute__((weak))
client_event_cb(struct bufferevent *bev, short events, void *ctx)
{
if (events & BEV_EVENT_ERROR)
perror("Error from bufferevent");
if (events & (BEV_EVENT_EOF | BEV_EVENT_TIMEOUT | BEV_EVENT_ERROR)) {
bufferevent_free(bev);
}
}
void __attribute__((weak))
setup_client(struct event_base *base, evutil_socket_t fd,
struct sockaddr *address, int socklen)
{
struct bufferevent *bev = bufferevent_socket_new(base, fd,
BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
bufferevent_setcb(bev, client_read_cb, NULL, client_event_cb, NULL);
bufferevent_set_timeouts(bev, common_timeout, common_timeout);
bufferevent_enable(bev, EV_READ|EV_WRITE);
}
static void
accept_conn_cb(struct evconnlistener *listener, evutil_socket_t fd,
struct sockaddr *address, int socklen, void *ctx)
{
struct event_base *base = evconnlistener_get_base(listener);
return setup_client(base, fd, address, socklen);
}
int __attribute__((weak)) daemon(int nochdir, int noclose);
void __attribute__((weak)) setup_program();
int main(int argc, char *argv[])
{
int ch, inetd = 0, run_as_daemon = 1;
const char *iface_ip = "127.0.0.1:5150";
struct event_base *base;
struct evconnlistener *listener;
while ((ch = getopt(argc, argv, "Dil:h")) != -1)
switch (ch) {
case 'D':
run_as_daemon = 0;
break;
case 'i':
inetd = 1;
break;
case 'l':
iface_ip = optarg;
break;
case 'h':
default:
fprintf(stderr, "Usage: %s [-D] [-i] [-l interface_ip:port]\n", argv[0]);
exit(EXIT_FAILURE);
}
if (run_as_daemon && !inetd)
if (daemon(1, 1) < 0) {
perror("daemon");
exit(EXIT_FAILURE);
}
base = event_base_new();
assert(base);
common_timeout = event_base_init_common_timeout(base, &timeout);
if (!inetd) {
struct sockaddr sa;
int len = sizeof(sa);
if (evutil_parse_sockaddr_port(iface_ip, &sa, &len) < 0)
exit(EXIT_FAILURE);
listener = evconnlistener_new_bind(base, accept_conn_cb, NULL,
LEV_OPT_CLOSE_ON_FREE | LEV_OPT_CLOSE_ON_EXEC | LEV_OPT_REUSEABLE,
100, &sa, len);
if (!listener)
exit(EXIT_FAILURE);
} else {
struct sockaddr sa;
socklen_t len = sizeof(sa);
getpeername(0, &sa, &len);
setup_client(base, 0, &sa, len);
}
if (setup_program)
setup_program();
signal(SIGPIPE, SIG_IGN);
event_base_dispatch(base);
return 0;
}
#ifdef __linux__
int
daemon(int nochdir, int noclose)
{
int fd;
switch (fork()) {
case -1:
return -1;
case 0:
break;
default:
_exit(0);
}
if (setsid() == -1)
return -1;
if (!nochdir)
chdir("/");
if (!noclose && (fd = open("/dev/null", O_RDWR)) >= 0) {
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
return 0;
}
#endif // __linux__
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