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/udp.c,v 1.10.2.4 2002/09/01 02:12:32 brian Exp $ 27 * $DragonFly: src/usr.sbin/ppp/udp.c,v 1.2 2003/06/17 04:30:01 dillon Exp $ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/socket.h> 32 #include <netinet/in.h> 33 #include <arpa/inet.h> 34 #include <netdb.h> 35 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <sysexits.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 "main.h" 62 #include "udp.h" 63 64 65 #define UDP_CONNECTED 1 66 #define UDP_UNCONNECTED 2 67 #define UDP_MAYBEUNCONNECTED 3 68 69 struct udpdevice { 70 struct device dev; /* What struct physical knows about */ 71 struct sockaddr_in sock; /* peer address */ 72 unsigned connected : 2; /* Have we connect()d ? */ 73 }; 74 75 #define device2udp(d) ((d)->type == UDP_DEVICE ? (struct udpdevice *)d : NULL) 76 77 unsigned 78 udp_DeviceSize(void) 79 { 80 return sizeof(struct udpdevice); 81 } 82 83 static ssize_t 84 udp_Sendto(struct physical *p, const void *v, size_t n) 85 { 86 struct udpdevice *dev = device2udp(p->handler); 87 int ret; 88 89 switch (dev->connected) { 90 case UDP_CONNECTED: 91 ret = write(p->fd, v, n); 92 break; 93 94 case UDP_UNCONNECTED: 95 default: 96 ret = sendto(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, 97 sizeof dev->sock); 98 break; 99 } 100 if (dev->connected == UDP_MAYBEUNCONNECTED) { 101 if (ret == -1 && errno == EISCONN) { 102 dev->connected = UDP_CONNECTED; 103 ret = write(p->fd, v, n); 104 } else 105 dev->connected = UDP_UNCONNECTED; 106 } 107 108 return ret; 109 } 110 111 static ssize_t 112 udp_Recvfrom(struct physical *p, void *v, size_t n) 113 { 114 struct udpdevice *dev = device2udp(p->handler); 115 int sz, ret; 116 117 if (dev->connected == UDP_CONNECTED) 118 return read(p->fd, v, n); 119 120 sz = sizeof dev->sock; 121 ret = recvfrom(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, &sz); 122 123 if (*p->name.full == '\0') { 124 snprintf(p->name.full, sizeof p->name.full, "%s:%d/udp", 125 inet_ntoa(dev->sock.sin_addr), ntohs(dev->sock.sin_port)); 126 p->name.base = p->name.full; 127 } 128 129 return ret; 130 } 131 132 static void 133 udp_Free(struct physical *p) 134 { 135 struct udpdevice *dev = device2udp(p->handler); 136 137 free(dev); 138 } 139 140 static void 141 udp_device2iov(struct device *d, struct iovec *iov, int *niov, 142 int maxiov __unused, int *auxfd __unused, int *nauxfd __unused) 143 { 144 int sz = physical_MaxDeviceSize(); 145 146 iov[*niov].iov_base = realloc(d, sz); 147 if (iov[*niov].iov_base == NULL) { 148 log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz); 149 AbortProgram(EX_OSERR); 150 } 151 iov[*niov].iov_len = sz; 152 (*niov)++; 153 } 154 155 static const struct device baseudpdevice = { 156 UDP_DEVICE, 157 "udp", 158 0, 159 { CD_NOTREQUIRED, 0 }, 160 NULL, 161 NULL, 162 NULL, 163 NULL, 164 NULL, 165 NULL, 166 NULL, 167 udp_Free, 168 udp_Recvfrom, 169 udp_Sendto, 170 udp_device2iov, 171 NULL, 172 NULL, 173 NULL 174 }; 175 176 struct device * 177 udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 178 int maxiov __unused, int *auxfd __unused, int *nauxfd __unused) 179 { 180 if (type == UDP_DEVICE) { 181 struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base; 182 183 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 184 if (dev == NULL) { 185 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 186 (int)(sizeof *dev)); 187 AbortProgram(EX_OSERR); 188 } 189 190 /* Refresh function pointers etc */ 191 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 192 193 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 194 return &dev->dev; 195 } 196 197 return NULL; 198 } 199 200 static struct udpdevice * 201 udp_CreateDevice(struct physical *p, char *host, char *port) 202 { 203 struct udpdevice *dev; 204 struct servent *sp; 205 206 if ((dev = malloc(sizeof *dev)) == NULL) { 207 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 208 p->link.name, strerror(errno)); 209 return NULL; 210 } 211 212 dev->sock.sin_family = AF_INET; 213 dev->sock.sin_addr = GetIpAddr(host); 214 if (dev->sock.sin_addr.s_addr == INADDR_NONE) { 215 log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host); 216 free(dev); 217 return NULL; 218 } 219 dev->sock.sin_port = htons(atoi(port)); 220 if (dev->sock.sin_port == 0) { 221 sp = getservbyname(port, "udp"); 222 if (sp) 223 dev->sock.sin_port = sp->s_port; 224 else { 225 log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port); 226 free(dev); 227 return NULL; 228 } 229 } 230 231 log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name, 232 host, port); 233 234 p->fd = socket(PF_INET, SOCK_DGRAM, 0); 235 if (p->fd >= 0) { 236 log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name, 237 p->name.full); 238 if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) { 239 dev->connected = UDP_CONNECTED; 240 return dev; 241 } else 242 log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno)); 243 } else 244 log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno)); 245 246 close(p->fd); 247 p->fd = -1; 248 free(dev); 249 250 return NULL; 251 } 252 253 struct device * 254 udp_Create(struct physical *p) 255 { 256 char *cp, *host, *port, *svc; 257 struct udpdevice *dev; 258 259 dev = NULL; 260 if (p->fd < 0) { 261 if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) { 262 *cp = '\0'; 263 host = p->name.full; 264 port = cp + 1; 265 svc = strchr(port, '/'); 266 if (svc && strcasecmp(svc, "/udp")) { 267 *cp = ':'; 268 return NULL; 269 } 270 if (svc) { 271 p->fd--; /* We own the device but maybe can't use it - change fd */ 272 *svc = '\0'; 273 } 274 275 if (*host && *port) 276 dev = udp_CreateDevice(p, host, port); 277 278 *cp = ':'; 279 if (svc) 280 *svc = '/'; 281 } 282 } else { 283 /* See if we're a connected udp socket */ 284 struct stat st; 285 286 if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) { 287 int type, sz; 288 289 sz = sizeof type; 290 if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) { 291 log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name); 292 close(p->fd); 293 p->fd = -1; 294 return NULL; 295 } 296 297 if (sz == sizeof type && type == SOCK_DGRAM) { 298 struct sockaddr_in sock; 299 struct sockaddr *sockp = (struct sockaddr *)&sock; 300 301 if ((dev = malloc(sizeof *dev)) == NULL) { 302 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 303 p->link.name, strerror(errno)); 304 return NULL; 305 } 306 307 if (getpeername(p->fd, sockp, &sz) == 0) { 308 log_Printf(LogPHASE, "%s: Link is a connected udp socket\n", 309 p->link.name); 310 dev->connected = UDP_CONNECTED; 311 } else { 312 log_Printf(LogPHASE, "%s: Link is a disconnected udp socket\n", 313 p->link.name); 314 315 dev->connected = UDP_MAYBEUNCONNECTED; 316 317 if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) { 318 log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n", 319 p->link.name); 320 p->link.lcp.cfg.openmode = OPEN_PASSIVE; 321 } 322 } 323 } 324 } 325 } 326 327 if (dev) { 328 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 329 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 330 if (p->cfg.cd.necessity != CD_DEFAULT) 331 log_Printf(LogWARN, "Carrier settings ignored\n"); 332 return &dev->dev; 333 } 334 335 return NULL; 336 } 337