jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 2 | * TUN interface functions. |
| 3 | * Copyright (C) 2002, 2003 Mondru AB. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 4 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 5 | * The contents of this file may be used under the terms of the GNU |
| 6 | * General Public License Version 2, provided that the above copyright |
| 7 | * notice and this permission notice is included in all copies or |
| 8 | * substantial portions of the software. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 9 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 10 | * The initial developer of the original code is |
| 11 | * Jens Jakobsen <jj@openggsn.org> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 12 | * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 13 | * Contributor(s): |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 14 | * |
| 15 | */ |
| 16 | |
| 17 | /* |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 18 | * tun.c: Contains all TUN functionality. Is able to handle multiple |
| 19 | * tunnels in the same program. Each tunnel is identified by the struct, |
| 20 | * which is passed to functions. |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 21 | * |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 22 | */ |
| 23 | |
| 24 | |
| 25 | #include <syslog.h> |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <netinet/in.h> |
| 31 | #include <arpa/inet.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/time.h> |
| 34 | #include <unistd.h> |
| 35 | #include <string.h> |
| 36 | #include <errno.h> |
| 37 | #include <fcntl.h> |
| 38 | |
| 39 | #include <stdio.h> |
| 40 | #include <fcntl.h> |
| 41 | #include <unistd.h> |
| 42 | #include <sys/time.h> |
| 43 | #include <sys/types.h> |
| 44 | #include <sys/ioctl.h> |
| 45 | #include <sys/socket.h> |
| 46 | #include <linux/if.h> |
| 47 | #include <errno.h> |
| 48 | #include <linux/if_tun.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 49 | #include <net/route.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 50 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 51 | #include <linux/netlink.h> |
| 52 | #include <linux/rtnetlink.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 53 | |
| 54 | #include "tun.h" |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 55 | #include "syserr.h" |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 56 | |
| 57 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 58 | |
| 59 | int tun_nlattr(struct nlmsghdr *n, int nsize, int type, void *d, int dlen) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 60 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 61 | int len = RTA_LENGTH(dlen); |
| 62 | int alen = NLMSG_ALIGN(n->nlmsg_len); |
| 63 | struct rtattr *rta = (struct rtattr*) (((void*)n) + alen); |
| 64 | if (alen + len > nsize) |
| 65 | return -1; |
| 66 | rta->rta_len = len; |
| 67 | rta->rta_type = type; |
| 68 | memcpy(RTA_DATA(rta), d, dlen); |
| 69 | n->nlmsg_len = alen + len; |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | int tun_gifindex(struct tun_t *this, int *index) { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 74 | struct ifreq ifr; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 75 | int fd; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 76 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 77 | memset (&ifr, '\0', sizeof (ifr)); |
| 78 | ifr.ifr_addr.sa_family = AF_INET; |
| 79 | ifr.ifr_dstaddr.sa_family = AF_INET; |
| 80 | ifr.ifr_netmask.sa_family = AF_INET; |
| 81 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 82 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 83 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 84 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 85 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 86 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 87 | if (ioctl(fd, SIOCGIFINDEX, &ifr)) { |
| 88 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 89 | "ioctl() failed"); |
| 90 | close(fd); |
| 91 | return -1; |
| 92 | } |
| 93 | close(fd); |
| 94 | *index = ifr.ifr_ifindex; |
| 95 | return 0; |
| 96 | } |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 97 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 98 | int tun_sifflags(struct tun_t *this, int flags) { |
| 99 | struct ifreq ifr; |
| 100 | int fd; |
| 101 | |
| 102 | memset (&ifr, '\0', sizeof (ifr)); |
| 103 | ifr.ifr_flags = flags; |
| 104 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 105 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 106 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 107 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 108 | "socket() failed"); |
| 109 | } |
| 110 | if (ioctl(fd, SIOCSIFFLAGS, &ifr)) { |
| 111 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 112 | "ioctl(SIOCSIFFLAGS) failed"); |
| 113 | close(fd); |
| 114 | return -1; |
| 115 | } |
| 116 | close(fd); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | |
| 121 | /* Currently unused */ |
| 122 | int tun_addroute2(struct tun_t *this, |
| 123 | struct in_addr *dst, |
| 124 | struct in_addr *gateway, |
| 125 | struct in_addr *mask) { |
| 126 | |
| 127 | struct { |
| 128 | struct nlmsghdr n; |
| 129 | struct rtmsg r; |
| 130 | char buf[TUN_NLBUFSIZE]; |
| 131 | } req; |
| 132 | |
| 133 | struct sockaddr_nl local; |
| 134 | int addr_len; |
| 135 | int fd; |
| 136 | int status; |
| 137 | struct sockaddr_nl nladdr; |
| 138 | struct iovec iov; |
| 139 | struct msghdr msg; |
| 140 | |
| 141 | memset(&req, 0, sizeof(req)); |
| 142 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 143 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 144 | req.n.nlmsg_type = RTM_NEWROUTE; |
| 145 | req.r.rtm_family = AF_INET; |
| 146 | req.r.rtm_table = RT_TABLE_MAIN; |
| 147 | req.r.rtm_protocol = RTPROT_BOOT; |
| 148 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 149 | req.r.rtm_type = RTN_UNICAST; |
| 150 | tun_nlattr(&req.n, sizeof(req), RTA_DST, dst, 4); |
| 151 | tun_nlattr(&req.n, sizeof(req), RTA_GATEWAY, gateway, 4); |
| 152 | |
| 153 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 154 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 155 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 156 | return -1; |
| 157 | } |
| 158 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 159 | memset(&local, 0, sizeof(local)); |
| 160 | local.nl_family = AF_NETLINK; |
| 161 | local.nl_groups = 0; |
| 162 | |
| 163 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 164 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 165 | "bind() failed"); |
| 166 | close(fd); |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | addr_len = sizeof(local); |
| 171 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 172 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 173 | "getsockname() failed"); |
| 174 | close(fd); |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | if (addr_len != sizeof(local)) { |
| 179 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 180 | "Wrong address length %d", addr_len); |
| 181 | close(fd); |
| 182 | return -1; |
| 183 | } |
| 184 | |
| 185 | if (local.nl_family != AF_NETLINK) { |
| 186 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 187 | "Wrong address family %d", local.nl_family); |
| 188 | close(fd); |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | iov.iov_base = (void*)&req.n; |
| 193 | iov.iov_len = req.n.nlmsg_len; |
| 194 | |
| 195 | msg.msg_name = (void*)&nladdr; |
| 196 | msg.msg_namelen = sizeof(nladdr), |
| 197 | msg.msg_iov = &iov; |
| 198 | msg.msg_iovlen = 1; |
| 199 | msg.msg_control = NULL; |
| 200 | msg.msg_controllen = 0; |
| 201 | msg.msg_flags = 0; |
| 202 | |
| 203 | memset(&nladdr, 0, sizeof(nladdr)); |
| 204 | nladdr.nl_family = AF_NETLINK; |
| 205 | nladdr.nl_pid = 0; |
| 206 | nladdr.nl_groups = 0; |
| 207 | |
| 208 | req.n.nlmsg_seq = 0; |
| 209 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 210 | |
| 211 | status = sendmsg(fd, &msg, 0); /* TODO: Error check */ |
| 212 | close(fd); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | |
| 217 | int tun_addaddr(struct tun_t *this, |
| 218 | struct in_addr *addr, |
| 219 | struct in_addr *dstaddr, |
| 220 | struct in_addr *netmask) { |
| 221 | struct { |
| 222 | struct nlmsghdr n; |
| 223 | struct ifaddrmsg i; |
| 224 | char buf[TUN_NLBUFSIZE]; |
| 225 | } req; |
| 226 | |
| 227 | struct sockaddr_nl local; |
| 228 | int addr_len; |
| 229 | int fd; |
| 230 | int status; |
| 231 | |
| 232 | struct sockaddr_nl nladdr; |
| 233 | struct iovec iov; |
| 234 | struct msghdr msg; |
| 235 | |
| 236 | if (!this->addrs) /* Use ioctl for first addr to make ping work */ |
| 237 | return tun_setaddr(this, addr, dstaddr, netmask); |
| 238 | |
| 239 | memset(&req, 0, sizeof(req)); |
| 240 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 241 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 242 | req.n.nlmsg_type = RTM_NEWADDR; |
| 243 | req.i.ifa_family = AF_INET; |
| 244 | req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */ |
| 245 | req.i.ifa_flags = 0; |
| 246 | req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ |
| 247 | if (tun_gifindex(this, &req.i.ifa_index)) { |
| 248 | return -1; |
| 249 | } |
| 250 | |
| 251 | tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(addr)); |
| 252 | tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(dstaddr)); |
| 253 | |
| 254 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 255 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 256 | "socket() failed"); |
| 257 | return -1; |
| 258 | } |
| 259 | |
| 260 | memset(&local, 0, sizeof(local)); |
| 261 | local.nl_family = AF_NETLINK; |
| 262 | local.nl_groups = 0; |
| 263 | |
| 264 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 265 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 266 | "bind() failed"); |
| 267 | close(fd); |
| 268 | return -1; |
| 269 | } |
| 270 | |
| 271 | addr_len = sizeof(local); |
| 272 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 273 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 274 | "getsockname() failed"); |
| 275 | close(fd); |
| 276 | return -1; |
| 277 | } |
| 278 | |
| 279 | if (addr_len != sizeof(local)) { |
| 280 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 281 | "Wrong address length %d", addr_len); |
| 282 | close(fd); |
| 283 | return -1; |
| 284 | } |
| 285 | |
| 286 | if (local.nl_family != AF_NETLINK) { |
| 287 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 288 | "Wrong address family %d", local.nl_family); |
| 289 | close(fd); |
| 290 | return -1; |
| 291 | } |
| 292 | |
| 293 | iov.iov_base = (void*)&req.n; |
| 294 | iov.iov_len = req.n.nlmsg_len; |
| 295 | |
| 296 | msg.msg_name = (void*)&nladdr; |
| 297 | msg.msg_namelen = sizeof(nladdr), |
| 298 | msg.msg_iov = &iov; |
| 299 | msg.msg_iovlen = 1; |
| 300 | msg.msg_control = NULL; |
| 301 | msg.msg_controllen = 0; |
| 302 | msg.msg_flags = 0; |
| 303 | |
| 304 | memset(&nladdr, 0, sizeof(nladdr)); |
| 305 | nladdr.nl_family = AF_NETLINK; |
| 306 | nladdr.nl_pid = 0; |
| 307 | nladdr.nl_groups = 0; |
| 308 | |
| 309 | req.n.nlmsg_seq = 0; |
| 310 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 311 | |
| 312 | status = sendmsg(fd, &msg, 0); /* TODO Error check */ |
| 313 | |
| 314 | tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 315 | close(fd); |
| 316 | this->addrs++; |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | |
| 321 | int tun_setaddr(struct tun_t *this, |
| 322 | struct in_addr *addr, |
| 323 | struct in_addr *dstaddr, |
| 324 | struct in_addr *netmask) |
| 325 | { |
| 326 | struct ifreq ifr; |
| 327 | int fd; |
| 328 | |
| 329 | memset (&ifr, '\0', sizeof (ifr)); |
| 330 | ifr.ifr_addr.sa_family = AF_INET; |
| 331 | ifr.ifr_dstaddr.sa_family = AF_INET; |
| 332 | ifr.ifr_netmask.sa_family = AF_INET; |
| 333 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 334 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 335 | |
| 336 | /* Create a channel to the NET kernel. */ |
| 337 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 338 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 339 | "socket() failed"); |
| 340 | return -1; |
| 341 | } |
| 342 | |
| 343 | if (addr) { /* Set the interface address */ |
| 344 | this->addr.s_addr = addr->s_addr; |
| 345 | ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = addr->s_addr; |
| 346 | if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) { |
| 347 | if (errno != EEXIST) { |
| 348 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 349 | "ioctl(SIOCSIFADDR) failed"); |
| 350 | } |
| 351 | else { |
| 352 | sys_err(LOG_WARNING, __FILE__, __LINE__, errno, |
| 353 | "ioctl(SIOCSIFADDR): Address already exists"); |
| 354 | } |
| 355 | close(fd); |
| 356 | return -1; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | if (dstaddr) { /* Set the destination address */ |
| 361 | this->dstaddr.s_addr = dstaddr->s_addr; |
| 362 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = |
| 363 | dstaddr->s_addr; |
| 364 | if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) { |
| 365 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 366 | "ioctl(SIOCSIFDSTADDR) failed"); |
| 367 | close(fd); |
| 368 | return -1; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | if (netmask) { /* Set the netmask */ |
| 373 | this->netmask.s_addr = netmask->s_addr; |
| 374 | ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = |
| 375 | netmask->s_addr; |
| 376 | if (ioctl(fd, SIOCSIFNETMASK, (void *) &ifr) < 0) { |
| 377 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 378 | "ioctl(SIOCSIFNETMASK) failed"); |
| 379 | close(fd); |
| 380 | return -1; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | close(fd); |
| 385 | this->addrs++; |
| 386 | return tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 387 | } |
| 388 | |
| 389 | int tun_addroute(struct tun_t *this, |
| 390 | struct in_addr *dst, |
| 391 | struct in_addr *gateway, |
| 392 | struct in_addr *mask) |
| 393 | { |
| 394 | struct rtentry r; |
| 395 | int fd; |
| 396 | |
| 397 | memset (&r, '\0', sizeof (r)); |
| 398 | r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */ |
| 399 | |
| 400 | /* Create a channel to the NET kernel. */ |
| 401 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 402 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 403 | "socket() failed"); |
| 404 | return -1; |
| 405 | } |
| 406 | |
| 407 | r.rt_dst.sa_family = AF_INET; |
| 408 | r.rt_gateway.sa_family = AF_INET; |
| 409 | r.rt_genmask.sa_family = AF_INET; |
| 410 | ((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr = dst->s_addr; |
| 411 | ((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr = gateway->s_addr; |
| 412 | ((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr = mask->s_addr; |
| 413 | |
| 414 | if (ioctl(fd, SIOCADDRT, (void *) &r) < 0) { /* SIOCDELRT */ |
| 415 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 416 | "ioctl(SIOCADDRT) failed"); |
| 417 | close(fd); |
| 418 | return -1; |
| 419 | } |
| 420 | close(fd); |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | |
| 425 | int tun_new(struct tun_t **tun) |
| 426 | { |
| 427 | struct ifreq ifr; |
| 428 | |
| 429 | if (!(*tun = calloc(1, sizeof(struct tun_t)))) { |
| 430 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "calloc() failed"); |
| 431 | return EOF; |
| 432 | } |
| 433 | |
| 434 | (*tun)->cb_ind = NULL; |
| 435 | (*tun)->addrs = 0; |
| 436 | |
| 437 | if (((*tun)->fd = open("/dev/net/tun", O_RDWR)) < 0) { |
| 438 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "open() failed"); |
| 439 | return -1; |
| 440 | } |
| 441 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 442 | memset(&ifr, 0, sizeof(ifr)); |
| 443 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Tun device, no packet info */ |
| 444 | strncpy(ifr.ifr_name, (*tun)->devname, IFNAMSIZ); |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 445 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 446 | if (ioctl((*tun)->fd, TUNSETIFF, (void *) &ifr) < 0) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 447 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "ioctl() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 448 | close((*tun)->fd); |
| 449 | return -1; |
| 450 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 451 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 452 | ioctl((*tun)->fd, TUNSETNOCSUM, 1); /* Disable checksums */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 453 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 454 | strncpy((*tun)->devname, ifr.ifr_name, IFNAMSIZ); |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 455 | (*tun)->devname[IFNAMSIZ] = 0; |
| 456 | |
| 457 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 458 | } |
| 459 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 460 | int tun_free(struct tun_t *tun) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 461 | { |
| 462 | if (close(tun->fd)) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 463 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "close() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 464 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 465 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 466 | free(tun); |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 471 | int tun_set_cb_ind(struct tun_t *this, |
| 472 | int (*cb_ind) (struct tun_t *tun, void *pack, unsigned len)) { |
| 473 | this->cb_ind = cb_ind; |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | int tun_decaps(struct tun_t *this) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 479 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 480 | unsigned char buffer[PACKET_MAX]; |
| 481 | int status; |
| 482 | |
| 483 | if ((status = read(this->fd, buffer, sizeof(buffer))) <= 0) { |
| 484 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "read() failed"); |
| 485 | return -1; |
| 486 | } |
| 487 | |
| 488 | if (this->cb_ind) |
| 489 | return this->cb_ind(this, buffer, status); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 490 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 491 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | int tun_encaps(struct tun_t *tun, void *pack, unsigned len) |
| 495 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 496 | return write(tun->fd, pack, len); |
| 497 | } |
| 498 | |
| 499 | int tun_runscript(struct tun_t *tun, char* script) { |
| 500 | |
| 501 | char buf[TUN_SCRIPTSIZE]; |
| 502 | char snet[TUN_ADDRSIZE]; |
| 503 | char smask[TUN_ADDRSIZE]; |
| 504 | |
| 505 | strncpy(snet, inet_ntoa(tun->addr), sizeof(snet)); |
| 506 | snet[sizeof(snet)-1] = 0; |
| 507 | strncpy(smask, inet_ntoa(tun->netmask), sizeof(smask)); |
| 508 | smask[sizeof(smask)-1] = 0; |
| 509 | |
| 510 | /* system("ipup /dev/tun0 192.168.0.10 255.255.255.0"); */ |
| 511 | snprintf(buf, sizeof(buf), "%s %s %s %s", |
| 512 | script, tun->devname, snet, smask); |
| 513 | buf[sizeof(buf)-1] = 0; |
| 514 | system(buf); |
| 515 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 516 | } |