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/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 "main.h" 60 #include "udp.h" 61 62 struct udpdevice { 63 struct device dev; /* What struct physical knows about */ 64 struct sockaddr_in sock; /* peer address */ 65 unsigned connected : 1; /* Have we connect()d ? */ 66 }; 67 68 #define device2udp(d) ((d)->type == UDP_DEVICE ? (struct udpdevice *)d : NULL) 69 70 int 71 udp_DeviceSize(void) 72 { 73 return sizeof(struct udpdevice); 74 } 75 76 static ssize_t 77 udp_Sendto(struct physical *p, const void *v, size_t n) 78 { 79 struct udpdevice *dev = device2udp(p->handler); 80 81 if (dev->connected) 82 return write(p->fd, v, n); 83 84 return sendto(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, 85 sizeof dev->sock); 86 } 87 88 static ssize_t 89 udp_Recvfrom(struct physical *p, void *v, size_t n) 90 { 91 struct udpdevice *dev = device2udp(p->handler); 92 int sz, ret; 93 94 if (dev->connected) 95 return read(p->fd, v, n); 96 97 sz = sizeof dev->sock; 98 ret = recvfrom(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, &sz); 99 100 if (*p->name.full == '\0') { 101 snprintf(p->name.full, sizeof p->name.full, "%s:%d/udp", 102 inet_ntoa(dev->sock.sin_addr), ntohs(dev->sock.sin_port)); 103 p->name.base = p->name.full; 104 } 105 106 return ret; 107 } 108 109 static void 110 udp_Free(struct physical *p) 111 { 112 struct udpdevice *dev = device2udp(p->handler); 113 114 free(dev); 115 } 116 117 static void 118 udp_device2iov(struct device *d, struct iovec *iov, int *niov, 119 int maxiov, pid_t newpid) 120 { 121 int sz = physical_MaxDeviceSize(); 122 123 iov[*niov].iov_base = realloc(d, sz); 124 if (iov[*niov].iov_base == NULL) { 125 log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz); 126 AbortProgram(EX_OSERR); 127 } 128 iov[*niov].iov_len = sz; 129 (*niov)++; 130 } 131 132 static const struct device baseudpdevice = { 133 UDP_DEVICE, 134 "udp", 135 NULL, 136 NULL, 137 NULL, 138 NULL, 139 NULL, 140 udp_Free, 141 udp_Recvfrom, 142 udp_Sendto, 143 udp_device2iov, 144 NULL, 145 NULL 146 }; 147 148 struct device * 149 udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 150 int maxiov) 151 { 152 if (type == UDP_DEVICE) { 153 struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base; 154 155 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 156 if (dev == NULL) { 157 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 158 (int)(sizeof *dev)); 159 AbortProgram(EX_OSERR); 160 } 161 162 /* Refresh function pointers etc */ 163 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 164 165 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 166 return &dev->dev; 167 } 168 169 return NULL; 170 } 171 172 static struct udpdevice * 173 udp_CreateDevice(struct physical *p, char *host, char *port) 174 { 175 struct udpdevice *dev; 176 struct servent *sp; 177 178 if ((dev = malloc(sizeof *dev)) == NULL) { 179 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 180 p->link.name, strerror(errno)); 181 return NULL; 182 } 183 184 dev->sock.sin_family = AF_INET; 185 dev->sock.sin_addr.s_addr = inet_addr(host); 186 dev->sock.sin_addr = GetIpAddr(host); 187 if (dev->sock.sin_addr.s_addr == INADDR_NONE) { 188 log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host); 189 free(dev); 190 return NULL; 191 } 192 dev->sock.sin_port = htons(atoi(port)); 193 if (dev->sock.sin_port == 0) { 194 sp = getservbyname(port, "udp"); 195 if (sp) 196 dev->sock.sin_port = sp->s_port; 197 else { 198 log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port); 199 free(dev); 200 return NULL; 201 } 202 } 203 204 log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name, 205 host, port); 206 207 p->fd = socket(PF_INET, SOCK_DGRAM, 0); 208 if (p->fd >= 0) { 209 log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name, 210 p->name.full); 211 if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) { 212 dev->connected = 1; 213 return dev; 214 } else 215 log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno)); 216 } else 217 log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno)); 218 219 close(p->fd); 220 p->fd = -1; 221 free(dev); 222 223 return NULL; 224 } 225 226 struct device * 227 udp_Create(struct physical *p) 228 { 229 char *cp, *host, *port, *svc; 230 struct udpdevice *dev; 231 232 dev = NULL; 233 if (p->fd < 0) { 234 if ((cp = strchr(p->name.full, ':')) != NULL) { 235 *cp = '\0'; 236 host = p->name.full; 237 port = cp + 1; 238 svc = strchr(port, '/'); 239 if (svc && strcasecmp(svc, "/udp")) { 240 *cp = ':'; 241 return NULL; 242 } 243 if (svc) 244 *svc = '\0'; 245 246 if (*host && *port) 247 dev = udp_CreateDevice(p, host, port); 248 249 *cp = ':'; 250 if (svc) 251 *svc = '/'; 252 } 253 } else { 254 /* See if we're a connected udp socket */ 255 int type, sz, err; 256 257 sz = sizeof type; 258 if ((err = getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz)) == 0 && 259 sz == sizeof type && type == SOCK_DGRAM) { 260 if ((dev = malloc(sizeof *dev)) == NULL) { 261 log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n", 262 p->link.name, strerror(errno)); 263 return NULL; 264 } 265 266 /* We can't getpeername().... hence we stay un-connect()ed */ 267 dev->connected = 0; 268 269 log_Printf(LogPHASE, "%s: Link is a udp socket\n", p->link.name); 270 271 if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) { 272 log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n", 273 p->link.name); 274 p->link.lcp.cfg.openmode = OPEN_PASSIVE; 275 } 276 } 277 } 278 279 if (dev) { 280 memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev); 281 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC); 282 return &dev->dev; 283 } 284 285 return NULL; 286 } 287