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 63 static int 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 * 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 * 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