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> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 43 | #include <sys/ioctl.h> |
| 44 | #include <sys/socket.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 45 | #include <errno.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 46 | #include <net/route.h> |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 47 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 48 | #ifdef __linux__ |
| 49 | #include <linux/if.h> |
| 50 | #include <linux/if_tun.h> |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 51 | #include <linux/netlink.h> |
| 52 | #include <linux/rtnetlink.h> |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 53 | #elif defined (__sun__) |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 54 | #include <stropts.h> |
| 55 | #include <sys/sockio.h> |
| 56 | #include <net/if.h> |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 57 | #include <net/if_tun.h> |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 58 | /*#include "sun_if_tun.h"*/ |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 59 | #endif |
| 60 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 61 | |
| 62 | #include "tun.h" |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 63 | #include "syserr.h" |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 64 | |
| 65 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 66 | #ifdef __linux__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 67 | 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] | 68 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 69 | int len = RTA_LENGTH(dlen); |
| 70 | int alen = NLMSG_ALIGN(n->nlmsg_len); |
| 71 | struct rtattr *rta = (struct rtattr*) (((void*)n) + alen); |
| 72 | if (alen + len > nsize) |
| 73 | return -1; |
| 74 | rta->rta_len = len; |
| 75 | rta->rta_type = type; |
| 76 | memcpy(RTA_DATA(rta), d, dlen); |
| 77 | n->nlmsg_len = alen + len; |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | int tun_gifindex(struct tun_t *this, int *index) { |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 82 | struct ifreq ifr; |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 83 | int fd; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 84 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 85 | memset (&ifr, '\0', sizeof (ifr)); |
| 86 | ifr.ifr_addr.sa_family = AF_INET; |
| 87 | ifr.ifr_dstaddr.sa_family = AF_INET; |
| 88 | ifr.ifr_netmask.sa_family = AF_INET; |
| 89 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 90 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 91 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 92 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 93 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 94 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 95 | if (ioctl(fd, SIOCGIFINDEX, &ifr)) { |
| 96 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 97 | "ioctl() failed"); |
| 98 | close(fd); |
| 99 | return -1; |
| 100 | } |
| 101 | close(fd); |
| 102 | *index = ifr.ifr_ifindex; |
| 103 | return 0; |
| 104 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 105 | #endif |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 106 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 107 | int tun_sifflags(struct tun_t *this, int flags) { |
| 108 | struct ifreq ifr; |
| 109 | int fd; |
| 110 | |
| 111 | memset (&ifr, '\0', sizeof (ifr)); |
| 112 | ifr.ifr_flags = flags; |
| 113 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 114 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 115 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 116 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 117 | "socket() failed"); |
| 118 | } |
| 119 | if (ioctl(fd, SIOCSIFFLAGS, &ifr)) { |
| 120 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 121 | "ioctl(SIOCSIFFLAGS) failed"); |
| 122 | close(fd); |
| 123 | return -1; |
| 124 | } |
| 125 | close(fd); |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 130 | /* Currently unused |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 131 | int tun_addroute2(struct tun_t *this, |
| 132 | struct in_addr *dst, |
| 133 | struct in_addr *gateway, |
| 134 | struct in_addr *mask) { |
| 135 | |
| 136 | struct { |
| 137 | struct nlmsghdr n; |
| 138 | struct rtmsg r; |
| 139 | char buf[TUN_NLBUFSIZE]; |
| 140 | } req; |
| 141 | |
| 142 | struct sockaddr_nl local; |
| 143 | int addr_len; |
| 144 | int fd; |
| 145 | int status; |
| 146 | struct sockaddr_nl nladdr; |
| 147 | struct iovec iov; |
| 148 | struct msghdr msg; |
| 149 | |
| 150 | memset(&req, 0, sizeof(req)); |
| 151 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 152 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 153 | req.n.nlmsg_type = RTM_NEWROUTE; |
| 154 | req.r.rtm_family = AF_INET; |
| 155 | req.r.rtm_table = RT_TABLE_MAIN; |
| 156 | req.r.rtm_protocol = RTPROT_BOOT; |
| 157 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| 158 | req.r.rtm_type = RTN_UNICAST; |
| 159 | tun_nlattr(&req.n, sizeof(req), RTA_DST, dst, 4); |
| 160 | tun_nlattr(&req.n, sizeof(req), RTA_GATEWAY, gateway, 4); |
| 161 | |
| 162 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 163 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 164 | "socket() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 165 | return -1; |
| 166 | } |
| 167 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 168 | memset(&local, 0, sizeof(local)); |
| 169 | local.nl_family = AF_NETLINK; |
| 170 | local.nl_groups = 0; |
| 171 | |
| 172 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 173 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 174 | "bind() failed"); |
| 175 | close(fd); |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | addr_len = sizeof(local); |
| 180 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 181 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 182 | "getsockname() failed"); |
| 183 | close(fd); |
| 184 | return -1; |
| 185 | } |
| 186 | |
| 187 | if (addr_len != sizeof(local)) { |
| 188 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 189 | "Wrong address length %d", addr_len); |
| 190 | close(fd); |
| 191 | return -1; |
| 192 | } |
| 193 | |
| 194 | if (local.nl_family != AF_NETLINK) { |
| 195 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 196 | "Wrong address family %d", local.nl_family); |
| 197 | close(fd); |
| 198 | return -1; |
| 199 | } |
| 200 | |
| 201 | iov.iov_base = (void*)&req.n; |
| 202 | iov.iov_len = req.n.nlmsg_len; |
| 203 | |
| 204 | msg.msg_name = (void*)&nladdr; |
| 205 | msg.msg_namelen = sizeof(nladdr), |
| 206 | msg.msg_iov = &iov; |
| 207 | msg.msg_iovlen = 1; |
| 208 | msg.msg_control = NULL; |
| 209 | msg.msg_controllen = 0; |
| 210 | msg.msg_flags = 0; |
| 211 | |
| 212 | memset(&nladdr, 0, sizeof(nladdr)); |
| 213 | nladdr.nl_family = AF_NETLINK; |
| 214 | nladdr.nl_pid = 0; |
| 215 | nladdr.nl_groups = 0; |
| 216 | |
| 217 | req.n.nlmsg_seq = 0; |
| 218 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 219 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 220 | status = sendmsg(fd, &msg, 0); * TODO: Error check * |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 221 | close(fd); |
| 222 | return 0; |
| 223 | } |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 224 | */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 225 | |
| 226 | int tun_addaddr(struct tun_t *this, |
| 227 | struct in_addr *addr, |
| 228 | struct in_addr *dstaddr, |
| 229 | struct in_addr *netmask) { |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 230 | |
| 231 | #ifdef __linux__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 232 | struct { |
| 233 | struct nlmsghdr n; |
| 234 | struct ifaddrmsg i; |
| 235 | char buf[TUN_NLBUFSIZE]; |
| 236 | } req; |
| 237 | |
| 238 | struct sockaddr_nl local; |
| 239 | int addr_len; |
| 240 | int fd; |
| 241 | int status; |
| 242 | |
| 243 | struct sockaddr_nl nladdr; |
| 244 | struct iovec iov; |
| 245 | struct msghdr msg; |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 246 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 247 | |
| 248 | if (!this->addrs) /* Use ioctl for first addr to make ping work */ |
| 249 | return tun_setaddr(this, addr, dstaddr, netmask); |
| 250 | |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 251 | #ifndef __linux__ |
| 252 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 253 | "Setting multiple addresses only possible on linux"); |
| 254 | return -1; |
| 255 | #else |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 256 | memset(&req, 0, sizeof(req)); |
| 257 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 258 | req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; |
| 259 | req.n.nlmsg_type = RTM_NEWADDR; |
| 260 | req.i.ifa_family = AF_INET; |
| 261 | req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */ |
| 262 | req.i.ifa_flags = 0; |
| 263 | req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */ |
| 264 | if (tun_gifindex(this, &req.i.ifa_index)) { |
| 265 | return -1; |
| 266 | } |
| 267 | |
| 268 | tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(addr)); |
| 269 | tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(dstaddr)); |
| 270 | |
| 271 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) { |
| 272 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 273 | "socket() failed"); |
| 274 | return -1; |
| 275 | } |
| 276 | |
| 277 | memset(&local, 0, sizeof(local)); |
| 278 | local.nl_family = AF_NETLINK; |
| 279 | local.nl_groups = 0; |
| 280 | |
| 281 | if (bind(fd, (struct sockaddr*)&local, sizeof(local)) < 0) { |
| 282 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 283 | "bind() failed"); |
| 284 | close(fd); |
| 285 | return -1; |
| 286 | } |
| 287 | |
| 288 | addr_len = sizeof(local); |
| 289 | if (getsockname(fd, (struct sockaddr*)&local, &addr_len) < 0) { |
| 290 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 291 | "getsockname() failed"); |
| 292 | close(fd); |
| 293 | return -1; |
| 294 | } |
| 295 | |
| 296 | if (addr_len != sizeof(local)) { |
| 297 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 298 | "Wrong address length %d", addr_len); |
| 299 | close(fd); |
| 300 | return -1; |
| 301 | } |
| 302 | |
| 303 | if (local.nl_family != AF_NETLINK) { |
| 304 | sys_err(LOG_ERR, __FILE__, __LINE__, 0, |
| 305 | "Wrong address family %d", local.nl_family); |
| 306 | close(fd); |
| 307 | return -1; |
| 308 | } |
| 309 | |
| 310 | iov.iov_base = (void*)&req.n; |
| 311 | iov.iov_len = req.n.nlmsg_len; |
| 312 | |
| 313 | msg.msg_name = (void*)&nladdr; |
| 314 | msg.msg_namelen = sizeof(nladdr), |
| 315 | msg.msg_iov = &iov; |
| 316 | msg.msg_iovlen = 1; |
| 317 | msg.msg_control = NULL; |
| 318 | msg.msg_controllen = 0; |
| 319 | msg.msg_flags = 0; |
| 320 | |
| 321 | memset(&nladdr, 0, sizeof(nladdr)); |
| 322 | nladdr.nl_family = AF_NETLINK; |
| 323 | nladdr.nl_pid = 0; |
| 324 | nladdr.nl_groups = 0; |
| 325 | |
| 326 | req.n.nlmsg_seq = 0; |
| 327 | req.n.nlmsg_flags |= NLM_F_ACK; |
| 328 | |
| 329 | status = sendmsg(fd, &msg, 0); /* TODO Error check */ |
| 330 | |
| 331 | tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 332 | close(fd); |
| 333 | this->addrs++; |
| 334 | return 0; |
jjako | 0141d20 | 2004-01-09 15:19:20 +0000 | [diff] [blame] | 335 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | |
| 339 | int tun_setaddr(struct tun_t *this, |
| 340 | struct in_addr *addr, |
| 341 | struct in_addr *dstaddr, |
| 342 | struct in_addr *netmask) |
| 343 | { |
| 344 | struct ifreq ifr; |
| 345 | int fd; |
| 346 | |
| 347 | memset (&ifr, '\0', sizeof (ifr)); |
| 348 | ifr.ifr_addr.sa_family = AF_INET; |
| 349 | ifr.ifr_dstaddr.sa_family = AF_INET; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 350 | #ifndef __sun__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 351 | ifr.ifr_netmask.sa_family = AF_INET; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 352 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 353 | strncpy(ifr.ifr_name, this->devname, IFNAMSIZ); |
| 354 | ifr.ifr_name[IFNAMSIZ-1] = 0; /* Make sure to terminate */ |
| 355 | |
| 356 | /* Create a channel to the NET kernel. */ |
| 357 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 358 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 359 | "socket() failed"); |
| 360 | return -1; |
| 361 | } |
| 362 | |
| 363 | if (addr) { /* Set the interface address */ |
| 364 | this->addr.s_addr = addr->s_addr; |
| 365 | ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = addr->s_addr; |
| 366 | if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) { |
| 367 | if (errno != EEXIST) { |
| 368 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 369 | "ioctl(SIOCSIFADDR) failed"); |
| 370 | } |
| 371 | else { |
| 372 | sys_err(LOG_WARNING, __FILE__, __LINE__, errno, |
| 373 | "ioctl(SIOCSIFADDR): Address already exists"); |
| 374 | } |
| 375 | close(fd); |
| 376 | return -1; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | if (dstaddr) { /* Set the destination address */ |
| 381 | this->dstaddr.s_addr = dstaddr->s_addr; |
| 382 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = |
| 383 | dstaddr->s_addr; |
| 384 | if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) { |
| 385 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 386 | "ioctl(SIOCSIFDSTADDR) failed"); |
| 387 | close(fd); |
| 388 | return -1; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | if (netmask) { /* Set the netmask */ |
| 393 | this->netmask.s_addr = netmask->s_addr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 394 | #ifdef __sun__ |
| 395 | ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = |
| 396 | dstaddr->s_addr; |
| 397 | #else |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 398 | ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = |
| 399 | netmask->s_addr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 400 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 401 | if (ioctl(fd, SIOCSIFNETMASK, (void *) &ifr) < 0) { |
| 402 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 403 | "ioctl(SIOCSIFNETMASK) failed"); |
| 404 | close(fd); |
| 405 | return -1; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | close(fd); |
| 410 | this->addrs++; |
| 411 | return tun_sifflags(this, IFF_UP | IFF_RUNNING); |
| 412 | } |
| 413 | |
| 414 | int tun_addroute(struct tun_t *this, |
| 415 | struct in_addr *dst, |
| 416 | struct in_addr *gateway, |
| 417 | struct in_addr *mask) |
| 418 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 419 | |
| 420 | /* TODO: Learn how to set routing table on sun */ |
| 421 | #ifndef __sun__ |
| 422 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 423 | struct rtentry r; |
| 424 | int fd; |
| 425 | |
| 426 | memset (&r, '\0', sizeof (r)); |
| 427 | r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */ |
| 428 | |
| 429 | /* Create a channel to the NET kernel. */ |
| 430 | if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| 431 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 432 | "socket() failed"); |
| 433 | return -1; |
| 434 | } |
| 435 | |
| 436 | r.rt_dst.sa_family = AF_INET; |
| 437 | r.rt_gateway.sa_family = AF_INET; |
| 438 | r.rt_genmask.sa_family = AF_INET; |
| 439 | ((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr = dst->s_addr; |
| 440 | ((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr = gateway->s_addr; |
| 441 | ((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr = mask->s_addr; |
| 442 | |
| 443 | if (ioctl(fd, SIOCADDRT, (void *) &r) < 0) { /* SIOCDELRT */ |
| 444 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, |
| 445 | "ioctl(SIOCADDRT) failed"); |
| 446 | close(fd); |
| 447 | return -1; |
| 448 | } |
| 449 | close(fd); |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 450 | |
| 451 | #endif |
| 452 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | |
| 457 | int tun_new(struct tun_t **tun) |
| 458 | { |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 459 | |
| 460 | #ifndef __sun__ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 461 | struct ifreq ifr; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 462 | #else |
| 463 | int if_fd, ppa = -1; |
| 464 | static int ip_fd = 0; |
| 465 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 466 | |
| 467 | if (!(*tun = calloc(1, sizeof(struct tun_t)))) { |
| 468 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "calloc() failed"); |
| 469 | return EOF; |
| 470 | } |
| 471 | |
| 472 | (*tun)->cb_ind = NULL; |
| 473 | (*tun)->addrs = 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 474 | |
| 475 | #ifdef __linux__ |
| 476 | /* Open the actual tun device */ |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 477 | if (((*tun)->fd = open("/dev/net/tun", O_RDWR)) < 0) { |
| 478 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "open() failed"); |
| 479 | return -1; |
| 480 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 481 | |
| 482 | /* Set device flags. For some weird reason this is also the method |
| 483 | used to obtain the network interface name */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 484 | memset(&ifr, 0, sizeof(ifr)); |
| 485 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Tun device, no packet info */ |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 486 | if (ioctl((*tun)->fd, TUNSETIFF, (void *) &ifr) < 0) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 487 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "ioctl() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 488 | close((*tun)->fd); |
| 489 | return -1; |
| 490 | } |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 491 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 492 | strncpy((*tun)->devname, ifr.ifr_name, IFNAMSIZ); |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 493 | (*tun)->devname[IFNAMSIZ] = 0; |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 494 | |
| 495 | ioctl((*tun)->fd, TUNSETNOCSUM, 1); /* Disable checksums */ |
| 496 | |
| 497 | #endif |
| 498 | |
| 499 | #ifdef __sun__ |
| 500 | |
| 501 | if( (ip_fd = open("/dev/ip", O_RDWR, 0)) < 0){ |
| 502 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "Can't open /dev/ip"); |
| 503 | return -1; |
| 504 | } |
| 505 | |
| 506 | if( ((*tun)->fd = open("/dev/tun", O_RDWR, 0)) < 0){ |
| 507 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "Can't open /dev/tun"); |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | /* Assign a new PPA and get its unit number. */ |
| 512 | if( (ppa = ioctl((*tun)->fd, TUNNEWPPA, -1)) < 0){ |
| 513 | syslog(LOG_ERR, "Can't assign new interface"); |
| 514 | return -1; |
| 515 | } |
| 516 | |
| 517 | if( (if_fd = open("/dev/tun", O_RDWR, 0)) < 0){ |
| 518 | syslog(LOG_ERR, "Can't open /dev/tun (2)"); |
| 519 | return -1; |
| 520 | } |
| 521 | if(ioctl(if_fd, I_PUSH, "ip") < 0){ |
| 522 | syslog(LOG_ERR, "Can't push IP module"); |
| 523 | return -1; |
| 524 | } |
| 525 | |
| 526 | /* Assign ppa according to the unit number returned by tun device */ |
| 527 | if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0){ |
| 528 | syslog(LOG_ERR, "Can't set PPA %d", ppa); |
| 529 | return -1; |
| 530 | } |
| 531 | |
| 532 | /* Link the two streams */ |
| 533 | if(ioctl(ip_fd, I_LINK, if_fd) < 0){ |
| 534 | syslog(LOG_ERR, "Can't link TUN device to IP"); |
| 535 | return -1; |
| 536 | } |
| 537 | |
| 538 | close (if_fd); |
| 539 | |
| 540 | sprintf((*tun)->devname, "tun%d", ppa); |
| 541 | |
| 542 | #endif |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 543 | |
| 544 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 545 | } |
| 546 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 547 | int tun_free(struct tun_t *tun) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 548 | { |
| 549 | if (close(tun->fd)) { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 550 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "close() failed"); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 551 | } |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 552 | |
jjako | ec89e9f | 2004-01-10 06:38:43 +0000 | [diff] [blame] | 553 | /* TODO: For solaris we need to unlink streams */ |
| 554 | |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 555 | free(tun); |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 560 | int tun_set_cb_ind(struct tun_t *this, |
| 561 | int (*cb_ind) (struct tun_t *tun, void *pack, unsigned len)) { |
| 562 | this->cb_ind = cb_ind; |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | |
| 567 | int tun_decaps(struct tun_t *this) |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 568 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 569 | unsigned char buffer[PACKET_MAX]; |
| 570 | int status; |
| 571 | |
| 572 | if ((status = read(this->fd, buffer, sizeof(buffer))) <= 0) { |
| 573 | sys_err(LOG_ERR, __FILE__, __LINE__, errno, "read() failed"); |
| 574 | return -1; |
| 575 | } |
| 576 | |
| 577 | if (this->cb_ind) |
| 578 | return this->cb_ind(this, buffer, status); |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 579 | |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 580 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | int tun_encaps(struct tun_t *tun, void *pack, unsigned len) |
| 584 | { |
jjako | a7cd249 | 2003-04-11 09:40:12 +0000 | [diff] [blame] | 585 | return write(tun->fd, pack, len); |
| 586 | } |
| 587 | |
| 588 | int tun_runscript(struct tun_t *tun, char* script) { |
| 589 | |
| 590 | char buf[TUN_SCRIPTSIZE]; |
| 591 | char snet[TUN_ADDRSIZE]; |
| 592 | char smask[TUN_ADDRSIZE]; |
| 593 | |
| 594 | strncpy(snet, inet_ntoa(tun->addr), sizeof(snet)); |
| 595 | snet[sizeof(snet)-1] = 0; |
| 596 | strncpy(smask, inet_ntoa(tun->netmask), sizeof(smask)); |
| 597 | smask[sizeof(smask)-1] = 0; |
| 598 | |
| 599 | /* system("ipup /dev/tun0 192.168.0.10 255.255.255.0"); */ |
| 600 | snprintf(buf, sizeof(buf), "%s %s %s %s", |
| 601 | script, tun->devname, snet, smask); |
| 602 | buf[sizeof(buf)-1] = 0; |
| 603 | system(buf); |
| 604 | return 0; |
jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 605 | } |