1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#include <sys/types.h>
32#include <sys/socket.h>
33#include <netinet/in.h>
34#include <arpa/inet.h>
35#include <netdb.h>
36
37#include <errno.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <sys/stat.h>
42#include <sys/uio.h>
43#include <termios.h>
44#include <unistd.h>
45
46#include "layer.h"
47#include "defs.h"
48#include "mbuf.h"
49#include "log.h"
50#include "timer.h"
51#include "lqr.h"
52#include "hdlc.h"
53#include "throughput.h"
54#include "fsm.h"
55#include "lcp.h"
56#include "ccp.h"
57#include "link.h"
58#include "async.h"
59#include "descriptor.h"
60#include "physical.h"
61#include "tcp.h"
62
63static int
64tcp_OpenConnection(const char *name, char *host, char *port)
65{
66  struct sockaddr_in dest;
67  int sock;
68  struct servent *sp;
69
70  dest.sin_family = AF_INET;
71  dest.sin_addr = GetIpAddr(host);
72  if (dest.sin_addr.s_addr == INADDR_NONE) {
73    log_Printf(LogWARN, "%s: %s: unknown host\n", name, host);
74    return -2;
75  }
76  dest.sin_port = htons(atoi(port));
77  if (dest.sin_port == 0) {
78    sp = getservbyname(port, "tcp");
79    if (sp)
80      dest.sin_port = sp->s_port;
81    else {
82      log_Printf(LogWARN, "%s: %s: unknown service\n", name, port);
83      return -2;
84    }
85  }
86  log_Printf(LogPHASE, "%s: Connecting to %s:%s/tcp\n", name, host, port);
87
88  sock = socket(PF_INET, SOCK_STREAM, 0);
89  if (sock < 0)
90    return -2;
91
92  if (connect(sock, (struct sockaddr *)&dest, sizeof dest) < 0) {
93    log_Printf(LogWARN, "%s: connect: %s\n", name, strerror(errno));
94    close(sock);
95    return -2;
96  }
97
98  return sock;
99}
100
101static struct device tcpdevice = {
102  TCP_DEVICE,
103  "tcp",
104  0,
105  { CD_NOTREQUIRED, 0 },
106  NULL,
107  NULL,
108  NULL,
109  NULL,
110  NULL,
111  NULL,
112  NULL,
113  NULL,
114  NULL,
115  NULL,
116  NULL,
117  NULL,
118  NULL,
119  NULL
120};
121
122struct device *
123tcp_iov2device(int type, struct physical *p, struct iovec *iov,
124               int *niov, int maxiov __unused, int *auxfd __unused,
125	       int *nauxfd __unused)
126{
127  if (type == TCP_DEVICE) {
128    free(iov[(*niov)++].iov_base);
129    physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
130    return &tcpdevice;
131  }
132
133  return NULL;
134}
135
136struct device *
137tcp_Create(struct physical *p)
138{
139  char *cp, *host, *port, *svc;
140
141  if (p->fd < 0) {
142    if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
143      *cp = '\0';
144      host = p->name.full;
145      port = cp + 1;
146      svc = strchr(port, '/');
147      if (svc && strcasecmp(svc, "/tcp")) {
148        *cp = ':';
149        return 0;
150      }
151      if (svc) {
152        p->fd--;     /* We own the device but maybe can't use it - change fd */
153        *svc = '\0';
154      }
155      if (*host && *port) {
156        p->fd = tcp_OpenConnection(p->link.name, host, port);
157        *cp = ':';
158        if (svc)
159          *svc = '/';
160        if (p->fd >= 0)
161          log_Printf(LogDEBUG, "%s: Opened tcp socket %s\n", p->link.name,
162                     p->name.full);
163      } else {
164        if (svc)
165          *svc = '/';
166        *cp = ':';
167      }
168    }
169  }
170
171  if (p->fd >= 0) {
172    /* See if we're a tcp socket */
173    struct stat st;
174
175    if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
176      int type, sz;
177
178      sz = sizeof type;
179      if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
180        log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
181        close(p->fd);
182        p->fd = -1;
183        return NULL;
184      }
185
186      if (sz == sizeof type && type == SOCK_STREAM) {
187        struct sockaddr_in sock;
188        struct sockaddr *sockp = (struct sockaddr *)&sock;
189
190        if (*p->name.full == '\0') {
191          sz = sizeof sock;
192          if (getpeername(p->fd, sockp, &sz) != 0 ||
193              sz != sizeof(struct sockaddr_in) || sock.sin_family != AF_INET) {
194            log_Printf(LogDEBUG, "%s: Link is SOCK_STREAM, but not inet\n",
195                       p->link.name);
196            return NULL;
197          }
198
199          log_Printf(LogPHASE, "%s: Link is a tcp socket\n", p->link.name);
200
201          snprintf(p->name.full, sizeof p->name.full, "%s:%d/tcp",
202                   inet_ntoa(sock.sin_addr), ntohs(sock.sin_port));
203          p->name.base = p->name.full;
204        }
205        physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
206        if (p->cfg.cd.necessity != CD_DEFAULT)
207          log_Printf(LogWARN, "Carrier settings ignored\n");
208        return &tcpdevice;
209      }
210    }
211  }
212
213  return NULL;
214}
215