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 <sysexits.h> 40 #include <sys/stat.h> 41 #include <sys/uio.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #include "layer.h" 46 #include "defs.h" 47 #include "mbuf.h" 48 #include "log.h" 49 #include "timer.h" 50 #include "lqr.h" 51 #include "hdlc.h" 52 #include "throughput.h" 53 #include "fsm.h" 54 #include "lcp.h" 55 #include "ccp.h" 56 #include "link.h" 57 #include "async.h" 58 #include "descriptor.h" 59 #include "physical.h" 60 #include "main.h" 61 #include "udp.h" 62 63 64 #define UDP_CONNECTED 1 65 #define UDP_UNCONNECTED 2 66 #define UDP_MAYBEUNCONNECTED 3 67 68 struct udpdevice { 69 struct device dev; /* What struct physical knows about */ 70 struct sockaddr_in sock; /* peer address */ 71 unsigned connected : 2; /* Have we connect()d ? */ 72 }; 73 74 #define device2udp(d) ((d)->type == UDP_DEVICE ? (struct udpdevice *)d : NULL) 75 76 unsigned 77 udp_DeviceSize(void) 78 { 79 return sizeof(struct udpdevice); 80 } 81 82 static ssize_t 83 udp_Sendto(struct physical *p, const void *v, size_t n) 84 { 85 struct udpdevice *dev = device2udp(p->handler); 86 int ret; 87 88 switch (dev->connected) { 89 case UDP_CONNECTED: 90 ret = write(p->fd, v, n); 91 break; 92 93 case UDP_UNCONNECTED: 94 default: 95 ret = sendto(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, 96 sizeof dev->sock); 97 break; 98 } 99 if (dev->connected == UDP_MAYBEUNCONNECTED) { 100 if (ret == -1 && errno == EISCONN) { 101 dev->connected = UDP_CONNECTED; 102 ret = write(p->fd, v, n); 103 } else 104 dev->connected = UDP_UNCONNECTED; 105 } 106 107 return ret; 108 } 109 110 static ssize_t 111 udp_Recvfrom(struct physical *p, void *v, size_t n) 112 { 113 struct udpdevice *dev = device2udp(p->handler); 114 int sz, ret; 115 116 if (dev->connected == UDP_CONNECTED) 117 return read(p->fd, v, n); 118 119 sz = sizeof dev->sock; 120 ret = recvfrom(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, &sz); 121 122 if (*p->name.full == '\0') { 123 snprintf(p->name.full, sizeof p->name.full, "%s:%d/udp", 124 inet_ntoa(dev->sock.sin_addr), ntohs(dev->sock.sin_port)); 125 p->name.base = p->name.full; 126 } 127 128 return ret; 129 } 130 131 static void 132 udp_Free(struct physical *p) 133 { 134 struct udpdevice *dev = device2udp(p->handler); 135 136 free(dev); 137 } 138 139 static void 140 udp_device2iov(struct device *d, struct iovec *iov, int *niov, 141 int maxiov __unused, int *auxfd __unused, int *nauxfd __unused) 142 { 143 int sz = physical_MaxDeviceSize(); 144 145 iov[*niov].iov_base = realloc(d, sz); 146 if (iov[*niov].iov_base == NULL) { 147 log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz); 148 AbortProgram(EX_OSERR); 149 } 150 iov[*niov].iov_len = sz; 151 (*niov)++; 152 } 153 154 static const struct device baseudpdevice = { 155 UDP_DEVICE, 156 "udp", 157 0, 158 { CD_NOTREQUIRED, 0 }, 159 NULL, 160 NULL, 161 NULL, 162 NULL, 163 NULL, 164 NULL, 165 NULL, 166 udp_Free, 167 udp_Recvfrom, 168 udp_Sendto, 169 udp_device2iov, 170 NULL, 171 NULL, 172 NULL 173 }; 174 175 struct device * 176 udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 177 int maxiov __unused, int *auxfd __unused, int *nauxfd __unused) 178 { 179 if (type == UDP_DEVICE) { 180 struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base; 181 182 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 183 if (dev == NULL) { 184 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 185 (int)(sizeof *dev)); 186 AbortProgram(EX_OSERR); 187 } 188 189 /* Refresh function pointers etc */ 190 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 191 192 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 193 return &dev->dev; 194 } 195 196 return NULL; 197 } 198 199 static struct udpdevice * 200 udp_CreateDevice(struct physical *p, char *host, char *port) 201 { 202 struct udpdevice *dev; 203 struct servent *sp; 204 205 if ((dev = malloc(sizeof *dev)) == NULL) { 206 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 207 p->link.name, strerror(errno)); 208 return NULL; 209 } 210 211 dev->sock.sin_family = AF_INET; 212 dev->sock.sin_addr = GetIpAddr(host); 213 if (dev->sock.sin_addr.s_addr == INADDR_NONE) { 214 log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host); 215 free(dev); 216 return NULL; 217 } 218 dev->sock.sin_port = htons(atoi(port)); 219 if (dev->sock.sin_port == 0) { 220 sp = getservbyname(port, "udp"); 221 if (sp) 222 dev->sock.sin_port = sp->s_port; 223 else { 224 log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port); 225 free(dev); 226 return NULL; 227 } 228 } 229 230 log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name, 231 host, port); 232 233 p->fd = socket(PF_INET, SOCK_DGRAM, 0); 234 if (p->fd >= 0) { 235 log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name, 236 p->name.full); 237 if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) { 238 dev->connected = UDP_CONNECTED; 239 return dev; 240 } else 241 log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno)); 242 } else 243 log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno)); 244 245 close(p->fd); 246 p->fd = -1; 247 free(dev); 248 249 return NULL; 250 } 251 252 struct device * 253 udp_Create(struct physical *p) 254 { 255 char *cp, *host, *port, *svc; 256 struct udpdevice *dev; 257 258 dev = NULL; 259 if (p->fd < 0) { 260 if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) { 261 *cp = '\0'; 262 host = p->name.full; 263 port = cp + 1; 264 svc = strchr(port, '/'); 265 if (svc && strcasecmp(svc, "/udp")) { 266 *cp = ':'; 267 return NULL; 268 } 269 if (svc) { 270 p->fd--; /* We own the device but maybe can't use it - change fd */ 271 *svc = '\0'; 272 } 273 274 if (*host && *port) 275 dev = udp_CreateDevice(p, host, port); 276 277 *cp = ':'; 278 if (svc) 279 *svc = '/'; 280 } 281 } else { 282 /* See if we're a connected udp socket */ 283 struct stat st; 284 285 if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) { 286 int type, sz; 287 288 sz = sizeof type; 289 if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) { 290 log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name); 291 close(p->fd); 292 p->fd = -1; 293 return NULL; 294 } 295 296 if (sz == sizeof type && type == SOCK_DGRAM) { 297 struct sockaddr_in sock; 298 struct sockaddr *sockp = (struct sockaddr *)&sock; 299 300 if ((dev = malloc(sizeof *dev)) == NULL) { 301 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 302 p->link.name, strerror(errno)); 303 return NULL; 304 } 305 306 if (getpeername(p->fd, sockp, &sz) == 0) { 307 log_Printf(LogPHASE, "%s: Link is a connected udp socket\n", 308 p->link.name); 309 dev->connected = UDP_CONNECTED; 310 } else { 311 log_Printf(LogPHASE, "%s: Link is a disconnected udp socket\n", 312 p->link.name); 313 314 dev->connected = UDP_MAYBEUNCONNECTED; 315 316 if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) { 317 log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n", 318 p->link.name); 319 p->link.lcp.cfg.openmode = OPEN_PASSIVE; 320 } 321 } 322 } 323 } 324 } 325 326 if (dev) { 327 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 328 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 329 if (p->cfg.cd.necessity != CD_DEFAULT) 330 log_Printf(LogWARN, "Carrier settings ignored\n"); 331 return &dev->dev; 332 } 333 334 return NULL; 335 } 336