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/*-
* Copyright (c) 2004 Free (Olivier Beyssac)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <syslog.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "net.h"
#define LISTENQ 5
/* Set a socket non-blocking. Return 1 if successful, 0 if not */
extern int net_socket_set_nb(const int sd)
{
int flags;
if ((flags = fcntl(sd, F_GETFL, 0)) == -1) {
syslog(LOG_ERR, "fcntl: %s", strerror(errno));
return 0;
}
if ((fcntl(sd, F_SETFL, flags | O_NONBLOCK)) == -1) {
syslog(LOG_ERR, "fcntl: %s", strerror(errno));
return 0;
}
return 1;
}
/* Return a TCP socket listening on ip:port
Return -1 on error */
extern int net_server_sock_create(const char *ip, const char *port)
{
struct sockaddr_in servaddr;
struct servent *sv;
struct hostent *h;
int listen_port;
int optval = 1;
int sd;
if ((listen_port = atoi(port)) == 0) {
if ((sv = getservbyname(port, "tcp")) == NULL) {
syslog(LOG_ERR, "getservbyname() error on %s", port);
return -1;
} else {
listen_port = ntohs(sv->s_port);
}
}
if ((h = gethostbyname(ip)) == NULL) {
syslog(LOG_ERR, "gethostbyname() error on %s\n", ip);
return -1;
}
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = h->h_addrtype;
memcpy((char *)&servaddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
servaddr.sin_port = htons(listen_port);
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
syslog(LOG_ERR, "socket(): %s", strerror(errno));
return -1;
}
setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
if (bind(sd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0) {
syslog(LOG_ERR, "bind() to port %s: %s", port, strerror(errno));
return -1;
}
if (listen(sd, LISTENQ) == -1) {
syslog(LOG_ERR, "listen() on port %s: %s", port, strerror(errno));
return -1;
}
return sd;
}
/* Return a TCP socket connected to server:port
Return -1 on error */
extern int net_client_sock_create(const char *server, const char *server_port)
{
int sd;
struct sockaddr_in local_addr, serv_addr;
struct hostent *h;
struct servent *sv;
int port;
if ((h = gethostbyname(server)) == NULL)
return -1;
if ((port = atoi(server_port)) == 0) {
if ((sv = getservbyname(server_port, "tcp")) == NULL)
return -1;
else
port = sv->s_port;
}
serv_addr.sin_family = h->h_addrtype;
memcpy((char *)&serv_addr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
serv_addr.sin_port = htons(port);
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
return -1;
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
local_addr.sin_port = htons(0);
if (bind(sd, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0)
return -1;
if (connect(sd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
return -1;
return sd;
}
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