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: stable/12/usr.sbin/ppp/tcp.c 326276 2017-11-27 15:37:16Z pfg $
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
63 static int
tcp_OpenConnection(const char * name,char * host,char * port)64 tcp_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
101 static 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
122 struct device *
tcp_iov2device(int type,struct physical * p,struct iovec * iov,int * niov,int maxiov __unused,int * auxfd __unused,int * nauxfd __unused)123 tcp_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
136 struct device *
tcp_Create(struct physical * p)137 tcp_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