1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 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 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 * 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 * 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