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 * $FreeBSD$ 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 int 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, int *auxfd, int *nauxfd) 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 { CD_NOTREQUIRED, 0 }, 158 NULL, 159 NULL, 160 NULL, 161 NULL, 162 NULL, 163 NULL, 164 udp_Free, 165 udp_Recvfrom, 166 udp_Sendto, 167 udp_device2iov, 168 NULL, 169 NULL 170 }; 171 172 struct device * 173 udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 174 int maxiov, int *auxfd, int *nauxfd) 175 { 176 if (type == UDP_DEVICE) { 177 struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base; 178 179 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 180 if (dev == NULL) { 181 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 182 (int)(sizeof *dev)); 183 AbortProgram(EX_OSERR); 184 } 185 186 /* Refresh function pointers etc */ 187 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 188 189 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 190 return &dev->dev; 191 } 192 193 return NULL; 194 } 195 196 static struct udpdevice * 197 udp_CreateDevice(struct physical *p, char *host, char *port) 198 { 199 struct udpdevice *dev; 200 struct servent *sp; 201 202 if ((dev = malloc(sizeof *dev)) == NULL) { 203 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 204 p->link.name, strerror(errno)); 205 return NULL; 206 } 207 208 dev->sock.sin_family = AF_INET; 209 dev->sock.sin_addr.s_addr = inet_addr(host); 210 dev->sock.sin_addr = GetIpAddr(host); 211 if (dev->sock.sin_addr.s_addr == INADDR_NONE) { 212 log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host); 213 free(dev); 214 return NULL; 215 } 216 dev->sock.sin_port = htons(atoi(port)); 217 if (dev->sock.sin_port == 0) { 218 sp = getservbyname(port, "udp"); 219 if (sp) 220 dev->sock.sin_port = sp->s_port; 221 else { 222 log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port); 223 free(dev); 224 return NULL; 225 } 226 } 227 228 log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name, 229 host, port); 230 231 p->fd = socket(PF_INET, SOCK_DGRAM, 0); 232 if (p->fd >= 0) { 233 log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name, 234 p->name.full); 235 if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) { 236 dev->connected = UDP_CONNECTED; 237 return dev; 238 } else 239 log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno)); 240 } else 241 log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno)); 242 243 close(p->fd); 244 p->fd = -1; 245 free(dev); 246 247 return NULL; 248 } 249 250 struct device * 251 udp_Create(struct physical *p) 252 { 253 char *cp, *host, *port, *svc; 254 struct udpdevice *dev; 255 256 dev = NULL; 257 if (p->fd < 0) { 258 if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) { 259 *cp = '\0'; 260 host = p->name.full; 261 port = cp + 1; 262 svc = strchr(port, '/'); 263 if (svc && strcasecmp(svc, "/udp")) { 264 *cp = ':'; 265 return NULL; 266 } 267 if (svc) { 268 p->fd--; /* We own the device but maybe can't use it - change fd */ 269 *svc = '\0'; 270 } 271 272 if (*host && *port) 273 dev = udp_CreateDevice(p, host, port); 274 275 *cp = ':'; 276 if (svc) 277 *svc = '/'; 278 } 279 } else { 280 /* See if we're a connected udp socket */ 281 struct stat st; 282 283 if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) { 284 int type, sz; 285 286 sz = sizeof type; 287 if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) { 288 log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name); 289 close(p->fd); 290 p->fd = -1; 291 return NULL; 292 } 293 294 if (sz == sizeof type && type == SOCK_DGRAM) { 295 if ((dev = malloc(sizeof *dev)) == NULL) { 296 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 297 p->link.name, strerror(errno)); 298 return NULL; 299 } 300 301 /* We can't getpeername().... */ 302 dev->connected = UDP_MAYBEUNCONNECTED; 303 304 log_Printf(LogPHASE, "%s: Link is a udp socket\n", p->link.name); 305 306 if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) { 307 log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n", 308 p->link.name); 309 p->link.lcp.cfg.openmode = OPEN_PASSIVE; 310 } 311 } 312 } 313 } 314 315 if (dev) { 316 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 317 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 318 if (p->cfg.cd.necessity != CD_DEFAULT) 319 log_Printf(LogWARN, "Carrier settings ignored\n"); 320 return &dev->dev; 321 } 322 323 return NULL; 324 } 325