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 * $FreeBSD: src/usr.sbin/ppp/tcp.c,v 1.19.26.1 2010/12/21 17:10:29 kensmith 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/stat.h>
40 #include <sys/uio.h>
41 #include <termios.h>
42 #include <unistd.h>
43
44 #include "layer.h"
45 #include "defs.h"
46 #include "mbuf.h"
47 #include "log.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
61 static int
tcp_OpenConnection(const char * name,char * host,char * port)62 tcp_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 = GetIpAddr(host);
70 if (dest.sin_addr.s_addr == INADDR_NONE) {
71 log_Printf(LogWARN, "%s: %s: unknown host\n", name, host);
72 return -2;
73 }
74 dest.sin_port = htons(atoi(port));
75 if (dest.sin_port == 0) {
76 sp = getservbyname(port, "tcp");
77 if (sp)
78 dest.sin_port = sp->s_port;
79 else {
80 log_Printf(LogWARN, "%s: %s: unknown service\n", name, port);
81 return -2;
82 }
83 }
84 log_Printf(LogPHASE, "%s: Connecting to %s:%s/tcp\n", name, host, port);
85
86 sock = socket(PF_INET, SOCK_STREAM, 0);
87 if (sock < 0)
88 return -2;
89
90 if (connect(sock, (struct sockaddr *)&dest, sizeof dest) < 0) {
91 log_Printf(LogWARN, "%s: connect: %s\n", name, strerror(errno));
92 close(sock);
93 return -2;
94 }
95
96 return sock;
97 }
98
99 static struct device tcpdevice = {
100 TCP_DEVICE,
101 "tcp",
102 0,
103 { CD_NOTREQUIRED, 0 },
104 NULL,
105 NULL,
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 };
119
120 struct device *
tcp_iov2device(int type,struct physical * p,struct iovec * iov,int * niov,int maxiov __unused,int * auxfd __unused,int * nauxfd __unused)121 tcp_iov2device(int type, struct physical *p, struct iovec *iov,
122 int *niov, int maxiov __unused, int *auxfd __unused,
123 int *nauxfd __unused)
124 {
125 if (type == TCP_DEVICE) {
126 free(iov[(*niov)++].iov_base);
127 physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
128 return &tcpdevice;
129 }
130
131 return NULL;
132 }
133
134 struct device *
tcp_Create(struct physical * p)135 tcp_Create(struct physical *p)
136 {
137 char *cp, *host, *port, *svc;
138
139 if (p->fd < 0) {
140 if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
141 *cp = '\0';
142 host = p->name.full;
143 port = cp + 1;
144 svc = strchr(port, '/');
145 if (svc && strcasecmp(svc, "/tcp")) {
146 *cp = ':';
147 return 0;
148 }
149 if (svc) {
150 p->fd--; /* We own the device but maybe can't use it - change fd */
151 *svc = '\0';
152 }
153 if (*host && *port) {
154 p->fd = tcp_OpenConnection(p->link.name, host, port);
155 *cp = ':';
156 if (svc)
157 *svc = '/';
158 if (p->fd >= 0)
159 log_Printf(LogDEBUG, "%s: Opened tcp socket %s\n", p->link.name,
160 p->name.full);
161 } else {
162 if (svc)
163 *svc = '/';
164 *cp = ':';
165 }
166 }
167 }
168
169 if (p->fd >= 0) {
170 /* See if we're a tcp socket */
171 struct stat st;
172
173 if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
174 int type, sz;
175
176 sz = sizeof type;
177 if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
178 log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
179 close(p->fd);
180 p->fd = -1;
181 return NULL;
182 }
183
184 if (sz == sizeof type && type == SOCK_STREAM) {
185 struct sockaddr_in sock;
186 struct sockaddr *sockp = (struct sockaddr *)&sock;
187
188 if (*p->name.full == '\0') {
189 sz = sizeof sock;
190 if (getpeername(p->fd, sockp, &sz) != 0 ||
191 sz != sizeof(struct sockaddr_in) || sock.sin_family != AF_INET) {
192 log_Printf(LogDEBUG, "%s: Link is SOCK_STREAM, but not inet\n",
193 p->link.name);
194 return NULL;
195 }
196
197 log_Printf(LogPHASE, "%s: Link is a tcp socket\n", p->link.name);
198
199 snprintf(p->name.full, sizeof p->name.full, "%s:%d/tcp",
200 inet_ntoa(sock.sin_addr), ntohs(sock.sin_port));
201 p->name.base = p->name.full;
202 }
203 physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
204 if (p->cfg.cd.necessity != CD_DEFAULT)
205 log_Printf(LogWARN, "Carrier settings ignored\n");
206 return &tcpdevice;
207 }
208 }
209 }
210
211 return NULL;
212 }
213