/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* 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 <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "descriptor.h"
#include "physical.h"
#include "tcp.h"
static int
tcp_OpenConnection(const char *name, char *host, char *port)
{
struct sockaddr_in dest;
int sock;
struct servent *sp;
dest.sin_family = AF_INET;
dest.sin_addr = GetIpAddr(host);
if (dest.sin_addr.s_addr == INADDR_NONE) {
log_Printf(LogWARN, "%s: %s: unknown host\n", name, host);
return -2;
}
dest.sin_port = htons(atoi(port));
if (dest.sin_port == 0) {
sp = getservbyname(port, "tcp");
if (sp)
dest.sin_port = sp->s_port;
else {
log_Printf(LogWARN, "%s: %s: unknown service\n", name, port);
return -2;
}
}
log_Printf(LogPHASE, "%s: Connecting to %s:%s/tcp\n", name, host, port);
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0)
return -2;
if (connect(sock, (struct sockaddr *)&dest, sizeof dest) < 0) {
log_Printf(LogWARN, "%s: connect: %s\n", name, strerror(errno));
close(sock);
return -2;
}
return sock;
}
static struct device tcpdevice = {
TCP_DEVICE,
"tcp",
0,
{ CD_NOTREQUIRED, 0 },
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
struct device *
tcp_iov2device(int type, struct physical *p, struct iovec *iov,
int *niov, int maxiov __unused, int *auxfd __unused,
int *nauxfd __unused)
{
if (type == TCP_DEVICE) {
free(iov[(*niov)++].iov_base);
physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
return &tcpdevice;
}
return NULL;
}
struct device *
tcp_Create(struct physical *p)
{
char *cp, *host, *port, *svc;
if (p->fd < 0) {
if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
*cp = '\0';
host = p->name.full;
port = cp + 1;
svc = strchr(port, '/');
if (svc && strcasecmp(svc, "/tcp")) {
*cp = ':';
return 0;
}
if (svc) {
p->fd--; /* We own the device but maybe can't use it - change fd */
*svc = '\0';
}
if (*host && *port) {
p->fd = tcp_OpenConnection(p->link.name, host, port);
*cp = ':';
if (svc)
*svc = '/';
if (p->fd >= 0)
log_Printf(LogDEBUG, "%s: Opened tcp socket %s\n", p->link.name,
p->name.full);
} else {
if (svc)
*svc = '/';
*cp = ':';
}
}
}
if (p->fd >= 0) {
/* See if we're a tcp socket */
struct stat st;
if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
int type, sz;
sz = sizeof type;
if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
close(p->fd);
p->fd = -1;
return NULL;
}
if (sz == sizeof type && type == SOCK_STREAM) {
struct sockaddr_in sock;
struct sockaddr *sockp = (struct sockaddr *)&sock;
if (*p->name.full == '\0') {
sz = sizeof sock;
if (getpeername(p->fd, sockp, &sz) != 0 ||
sz != sizeof(struct sockaddr_in) || sock.sin_family != AF_INET) {
log_Printf(LogDEBUG, "%s: Link is SOCK_STREAM, but not inet\n",
p->link.name);
return NULL;
}
log_Printf(LogPHASE, "%s: Link is a tcp socket\n", p->link.name);
snprintf(p->name.full, sizeof p->name.full, "%s:%d/tcp",
inet_ntoa(sock.sin_addr), ntohs(sock.sin_port));
p->name.base = p->name.full;
}
physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
if (p->cfg.cd.necessity != CD_DEFAULT)
log_Printf(LogWARN, "Carrier settings ignored\n");
return &tcpdevice;
}
}
}
return NULL;
}
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