tcp.c revision 47769 
1/*-
2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$Id: tcp.c,v 1.3 1999/05/24 16:39:15 brian Exp $
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <netdb.h>
34
35#include <errno.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <sys/uio.h>
40#include <termios.h>
41#include <unistd.h>
42
43#include "layer.h"
44#include "defs.h"
45#include "mbuf.h"
46#include "log.h"
47#include "sync.h"
48#include "timer.h"
49#include "lqr.h"
50#include "hdlc.h"
51#include "throughput.h"
52#include "fsm.h"
53#include "lcp.h"
54#include "ccp.h"
55#include "link.h"
56#include "async.h"
57#include "descriptor.h"
58#include "physical.h"
59#include "tcp.h"
60
61static int
62tcp_OpenConnection(const char *name, char *host, char *port)
63{
64  struct sockaddr_in dest;
65  int sock;
66  struct servent *sp;
67
68  dest.sin_family = AF_INET;
69  dest.sin_addr.s_addr = inet_addr(host);
70  dest.sin_addr = GetIpAddr(host);
71  if (dest.sin_addr.s_addr == INADDR_NONE) {
72    log_Printf(LogWARN, "%s: %s: unknown host\n", name, host);
73    return -1;
74  }
75  dest.sin_port = htons(atoi(port));
76  if (dest.sin_port == 0) {
77    sp = getservbyname(port, "tcp");
78    if (sp)
79      dest.sin_port = sp->s_port;
80    else {
81      log_Printf(LogWARN, "%s: %s: unknown service\n", name, port);
82      return -1;
83    }
84  }
85  log_Printf(LogPHASE, "%s: Connecting to %s:%s/tcp\n", name, host, port);
86
87  sock = socket(PF_INET, SOCK_STREAM, 0);
88  if (sock < 0)
89    return sock;
90
91  if (connect(sock, (struct sockaddr *)&dest, sizeof dest) < 0) {
92    log_Printf(LogWARN, "%s: connect: %s\n", name, strerror(errno));
93    close(sock);
94    return -1;
95  }
96
97  return sock;
98}
99
100static struct device tcpdevice = {
101  TCP_DEVICE,
102  "tcp",
103  NULL,
104  NULL,
105  NULL,
106  NULL,
107  NULL,
108  NULL,
109  NULL,
110  NULL,
111  NULL,
112  NULL
113};
114
115struct device *
116tcp_iov2device(int type, struct physical *p, struct iovec *iov,
117               int *niov, int maxiov)
118{
119  if (type == TCP_DEVICE) {
120    free(iov[(*niov)++].iov_base);
121    physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
122    return &tcpdevice;
123  }
124
125  return NULL;
126}
127
128struct device *
129tcp_Create(struct physical *p)
130{
131  char *cp, *host, *port, *svc;
132
133  if (p->fd < 0) {
134    if ((cp = strchr(p->name.full, ':')) != NULL) {
135      *cp = '\0';
136      host = p->name.full;
137      port = cp + 1;
138      svc = strchr(port, '/');
139      if (svc && strcasecmp(svc, "/tcp")) {
140        *cp = ':';
141        return 0;
142      }
143      if (svc)
144        *svc = '\0';
145      if (*host && *port) {
146        p->fd = tcp_OpenConnection(p->link.name, host, port);
147        *cp = ':';
148        if (svc)
149          *svc = '/';
150        if (p->fd >= 0)
151          log_Printf(LogDEBUG, "%s: Opened tcp socket %s\n", p->link.name,
152                     p->name.full);
153      } else {
154        if (svc)
155          *svc = '/';
156        *cp = ':';
157      }
158    }
159  }
160
161  if (p->fd >= 0) {
162    /* See if we're a tcp socket */
163    int type, sz, err;
164
165    sz = sizeof type;
166    if ((err = getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz)) == 0 &&
167        sz == sizeof type && type == SOCK_STREAM) {
168      struct sockaddr_in sock;
169      struct sockaddr *sockp = (struct sockaddr *)&sock;
170
171      if (*p->name.full == '\0') {
172        sz = sizeof sock;
173        if (getpeername(p->fd, sockp, &sz) != 0 ||
174            sz != sizeof(struct sockaddr_in) || sock.sin_family != AF_INET) {
175          log_Printf(LogDEBUG, "%s: Link is SOCK_STREAM, but not inet\n",
176                     p->link.name);
177          return NULL;
178        }
179
180        log_Printf(LogPHASE, "%s: Link is a tcp socket\n", p->link.name);
181
182        snprintf(p->name.full, sizeof p->name.full, "%s:%d/tcp",
183                 inet_ntoa(sock.sin_addr), ntohs(sock.sin_port));
184        p->name.base = p->name.full;
185      }
186      physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
187      return &tcpdevice;
188    }
189  }
190
191  return NULL;
192}
193