| d3372da9 |
1 | /* |
| 2 | * Dolda Connect - Modular multiuser Direct Connect-style client |
| 3 | * Copyright (C) 2004 Fredrik Tolf (fredrik@dolda2000.com) |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | /* XXX: Implement SOCKS proxyability */ |
| 20 | |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | #include <config.h> |
| 23 | #endif |
| 24 | #include <string.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <unistd.h> |
| 27 | #include <fcntl.h> |
| 28 | #include <sys/ioctl.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <sys/un.h> |
| 31 | #include <sys/poll.h> |
| 32 | #include <arpa/inet.h> |
| 33 | #include <netinet/in.h> |
| 34 | #include <netdb.h> |
| 35 | #include <sys/signal.h> |
| 36 | #include <printf.h> |
| 37 | #ifdef HAVE_LINUX_SOCKIOS_H |
| 38 | #include <linux/sockios.h> |
| 39 | #endif |
| 40 | #include <errno.h> |
| 41 | #include <net/if.h> |
| 42 | |
| 43 | #include "conf.h" |
| 44 | #include "net.h" |
| 45 | #include "module.h" |
| 46 | #include "log.h" |
| 47 | #include "utils.h" |
| 48 | #include "sysevents.h" |
| 49 | |
| 50 | static struct configvar myvars[] = |
| 51 | { |
| 52 | /* 0 = Direct mode, 1 = Passive mode, 2 = SOCKS proxy */ |
| 53 | {CONF_VAR_INT, "mode", {.num = 0}}, |
| 347d6d76 |
54 | {CONF_VAR_BOOL, "reuseaddr", {.num = 0}}, |
| d3372da9 |
55 | /* Only for direct mode */ |
| 56 | {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}}, |
| 57 | {CONF_VAR_STRING, "publicif", {.str = L""}}, |
| 58 | {CONF_VAR_END} |
| 59 | }; |
| 60 | |
| 61 | static struct socket *sockets = NULL; |
| 62 | int numsocks = 0; |
| 63 | |
| 64 | /* XXX: Get autoconf for all this... */ |
| 65 | int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf) |
| 66 | { |
| 67 | struct sockaddr_in *ipv4; |
| 68 | struct configvar *var; |
| 69 | void *bufend; |
| 70 | int sock; |
| 71 | struct ifconf conf; |
| 72 | struct ifreq *ifr, req; |
| 73 | char *pif; |
| 74 | |
| 75 | if(af == AF_INET) |
| 76 | { |
| 77 | var = confgetvar("net", "visibleipv4"); |
| 78 | if(var->val.ipv4.s_addr != 0) |
| 79 | { |
| 80 | ipv4 = smalloc(sizeof(*ipv4)); |
| 81 | ipv4->sin_family = AF_INET; |
| 82 | ipv4->sin_addr.s_addr = var->val.ipv4.s_addr; |
| 83 | *addr = (struct sockaddr *)ipv4; |
| 84 | *lenbuf = sizeof(*ipv4); |
| 85 | return(0); |
| 86 | } |
| 87 | if((pif = icwcstombs(confgetstr("net", "publicif"), NULL)) == NULL) |
| 88 | { |
| 89 | flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno)); |
| 90 | return(-1); |
| 91 | } |
| 92 | if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
| 93 | return(-1); |
| 94 | conf.ifc_buf = smalloc(conf.ifc_len = 65536); |
| 95 | if(ioctl(sock, SIOCGIFCONF, &conf) < 0) |
| 96 | { |
| 97 | free(conf.ifc_buf); |
| 98 | close(sock); |
| 99 | return(-1); |
| 100 | } |
| 101 | bufend = ((char *)conf.ifc_buf) + conf.ifc_len; |
| 102 | ipv4 = NULL; |
| 103 | for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++) |
| 104 | { |
| 105 | memset(&req, 0, sizeof(req)); |
| 106 | memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name)); |
| 107 | if(ioctl(sock, SIOCGIFFLAGS, &req) < 0) |
| 108 | { |
| 109 | free(conf.ifc_buf); |
| 110 | close(sock); |
| 111 | return(-1); |
| 112 | } |
| 113 | if(!(req.ifr_flags & IFF_UP)) |
| 114 | continue; |
| 115 | if(ifr->ifr_addr.sa_family == AF_INET) |
| 116 | { |
| 117 | if(ntohl(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr) == 0x7f000001) |
| 118 | continue; |
| 119 | if(ipv4 == NULL) |
| 120 | { |
| 121 | ipv4 = smalloc(sizeof(*ipv4)); |
| 122 | memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); |
| 123 | } else { |
| 124 | free(ipv4); |
| 125 | flog(LOG_WARNING, "could not locate an unambiguous interface for determining your public IP address - set net.publicif"); |
| 126 | errno = ENFILE; /* XXX: There's no appropriate one for this... */ |
| 127 | return(-1); |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | close(sock); |
| 132 | if(ipv4 != NULL) |
| 133 | { |
| 134 | *addr = (struct sockaddr *)ipv4; |
| 135 | *lenbuf = sizeof(*ipv4); |
| 136 | return(0); |
| 137 | } |
| 138 | errno = ENETDOWN; |
| 139 | return(-1); |
| 140 | } |
| 141 | errno = EPFNOSUPPORT; |
| 142 | return(-1); |
| 143 | } |
| 144 | |
| 145 | static struct socket *newsock(int type) |
| 146 | { |
| 147 | struct socket *new; |
| 148 | |
| 149 | new = smalloc(sizeof(*new)); |
| 150 | new->refcount = 2; |
| 151 | new->fd = -1; |
| 152 | new->isrealsocket = 1; |
| 153 | new->family = -1; |
| 154 | new->tos = 0; |
| 155 | new->type = type; |
| 156 | new->state = -1; |
| 157 | new->ignread = 0; |
| 158 | new->close = 0; |
| 159 | new->remote = NULL; |
| 160 | new->remotelen = 0; |
| 161 | switch(type) |
| 162 | { |
| 163 | case SOCK_STREAM: |
| 164 | new->outbuf.s.buf = NULL; |
| 165 | new->outbuf.s.bufsize = 0; |
| 166 | new->outbuf.s.datasize = 0; |
| 167 | new->inbuf.s.buf = NULL; |
| 168 | new->inbuf.s.bufsize = 0; |
| 169 | new->inbuf.s.datasize = 0; |
| 170 | break; |
| 171 | case SOCK_DGRAM: |
| 172 | new->outbuf.d.f = new->outbuf.d.l = NULL; |
| 173 | new->inbuf.d.f = new->inbuf.d.l = NULL; |
| 174 | break; |
| 175 | } |
| 176 | new->conncb = NULL; |
| 177 | new->errcb = NULL; |
| 178 | new->readcb = NULL; |
| 179 | new->writecb = NULL; |
| 180 | new->acceptcb = NULL; |
| 181 | new->next = sockets; |
| 182 | new->prev = NULL; |
| 183 | if(sockets != NULL) |
| 184 | sockets->prev = new; |
| 185 | sockets = new; |
| 186 | numsocks++; |
| 187 | return(new); |
| 188 | } |
| 189 | |
| 190 | static struct socket *mksock(int domain, int type) |
| 191 | { |
| 192 | int fd; |
| 193 | struct socket *new; |
| 194 | |
| 195 | if((fd = socket(domain, type, 0)) < 0) |
| 196 | { |
| 197 | flog(LOG_CRIT, "could not create socket: %s", strerror(errno)); |
| 198 | return(NULL); |
| 199 | } |
| 200 | new = newsock(type); |
| 201 | new->fd = fd; |
| 202 | new->family = domain; |
| 203 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 204 | return(new); |
| 205 | } |
| 206 | |
| 207 | struct socket *wrapsock(int fd) |
| 208 | { |
| 209 | struct socket *new; |
| 210 | |
| 211 | new = newsock(SOCK_STREAM); |
| 212 | new->fd = fd; |
| 213 | new->state = SOCK_EST; |
| 214 | new->isrealsocket = 0; |
| 215 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 216 | return(new); |
| 217 | } |
| 218 | |
| 219 | static void unlinksock(struct socket *sk) |
| 220 | { |
| 221 | if(sk->prev != NULL) |
| 222 | sk->prev->next = sk->next; |
| 223 | if(sk->next != NULL) |
| 224 | sk->next->prev = sk->prev; |
| 225 | if(sk == sockets) |
| 226 | sockets = sk->next; |
| 227 | putsock(sk); |
| 228 | numsocks--; |
| 229 | } |
| 230 | |
| 231 | void getsock(struct socket *sk) |
| 232 | { |
| 233 | sk->refcount++; |
| 234 | } |
| 235 | |
| 236 | void putsock(struct socket *sk) |
| 237 | { |
| 238 | struct dgrambuf *buf; |
| 239 | |
| 240 | if(--(sk->refcount) == 0) |
| 241 | { |
| 242 | switch(sk->type) |
| 243 | { |
| 244 | case SOCK_STREAM: |
| 245 | if(sk->outbuf.s.buf != NULL) |
| 246 | free(sk->outbuf.s.buf); |
| 247 | if(sk->inbuf.s.buf != NULL) |
| 248 | free(sk->inbuf.s.buf); |
| 249 | break; |
| 250 | case SOCK_DGRAM: |
| 251 | while((buf = sk->outbuf.d.f) != NULL) |
| 252 | { |
| 253 | sk->outbuf.d.f = buf->next; |
| 254 | free(buf->data); |
| 255 | free(buf); |
| 256 | } |
| 257 | while((buf = sk->inbuf.d.f) != NULL) |
| 258 | { |
| 259 | sk->inbuf.d.f = buf->next; |
| 260 | free(buf->data); |
| 261 | free(buf); |
| 262 | } |
| 263 | break; |
| 264 | } |
| 265 | if(sk->fd >= 0) |
| 266 | close(sk->fd); |
| 267 | if(sk->remote != NULL) |
| 268 | free(sk->remote); |
| 269 | free(sk); |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | void *sockgetinbuf(struct socket *sk, size_t *size) |
| 274 | { |
| 275 | void *buf; |
| 276 | struct dgrambuf *dbuf; |
| 277 | |
| 278 | switch(sk->type) |
| 279 | { |
| 280 | case SOCK_STREAM: |
| 281 | if((sk->inbuf.s.buf == NULL) || (sk->inbuf.s.datasize == 0)) |
| 282 | { |
| 283 | *size = 0; |
| 284 | return(NULL); |
| 285 | } |
| 286 | buf = sk->inbuf.s.buf; |
| 287 | *size = sk->inbuf.s.datasize; |
| 288 | sk->inbuf.s.buf = NULL; |
| 289 | sk->inbuf.s.bufsize = sk->inbuf.s.datasize = 0; |
| 290 | return(buf); |
| 291 | case SOCK_DGRAM: |
| 292 | if((dbuf = sk->inbuf.d.f) == NULL) |
| 293 | return(NULL); |
| 294 | sk->inbuf.d.f = dbuf->next; |
| 295 | if(dbuf->next == NULL) |
| 296 | sk->inbuf.d.l = NULL; |
| 297 | buf = dbuf->data; |
| 298 | *size = dbuf->size; |
| 299 | free(dbuf->addr); |
| 300 | free(dbuf); |
| 301 | return(buf); |
| 302 | } |
| 303 | return(NULL); |
| 304 | } |
| 305 | |
| 306 | static void sockrecv(struct socket *sk) |
| 307 | { |
| 308 | int ret, inq; |
| 309 | struct dgrambuf *dbuf; |
| 310 | |
| 311 | switch(sk->type) |
| 312 | { |
| 313 | case SOCK_STREAM: |
| 314 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) |
| 315 | /* SIOCINQ is Linux-specific AFAIK, but I really have no idea |
| 316 | * how to read the inqueue size on other OSs */ |
| 317 | if(ioctl(sk->fd, SIOCINQ, &inq)) |
| 318 | { |
| 319 | /* I don't really know what could go wrong here, so let's |
| 320 | * assume it's transient. */ |
| 321 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), sk->fd); |
| 322 | inq = 2048; |
| 323 | } |
| 324 | #else |
| 325 | inq = 2048; |
| 326 | #endif |
| 327 | if(inq > 65536) |
| 328 | inq = 65536; |
| 329 | sizebuf(&sk->inbuf.s.buf, &sk->inbuf.s.bufsize, sk->inbuf.s.datasize + inq, 1, 1); |
| 330 | ret = read(sk->fd, sk->inbuf.s.buf + sk->inbuf.s.datasize, inq); |
| 331 | if(ret < 0) |
| 332 | { |
| 333 | if((errno == EINTR) || (errno == EAGAIN)) |
| 334 | return; |
| 335 | if(sk->errcb != NULL) |
| 336 | sk->errcb(sk, errno, sk->data); |
| 337 | closesock(sk); |
| 338 | return; |
| 339 | } |
| 340 | if(ret == 0) |
| 341 | { |
| 342 | if(sk->errcb != NULL) |
| 343 | sk->errcb(sk, 0, sk->data); |
| 344 | closesock(sk); |
| 345 | return; |
| 346 | } |
| 347 | sk->inbuf.s.datasize += ret; |
| 348 | if(sk->readcb != NULL) |
| 349 | sk->readcb(sk, sk->data); |
| 350 | break; |
| 351 | case SOCK_DGRAM: |
| 352 | if(ioctl(sk->fd, SIOCINQ, &inq)) |
| 353 | { |
| 354 | /* I don't really know what could go wrong here, so let's |
| 355 | * assume it's transient. */ |
| 356 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), sk->fd); |
| 357 | return; |
| 358 | } |
| 359 | dbuf = smalloc(sizeof(*dbuf)); |
| 360 | dbuf->data = smalloc(inq); |
| 361 | dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage)); |
| 362 | ret = recvfrom(sk->fd, dbuf->data, inq, 0, dbuf->addr, &dbuf->addrlen); |
| 363 | if(ret < 0) |
| 364 | { |
| 365 | free(dbuf->addr); |
| 366 | free(dbuf->data); |
| 367 | free(dbuf); |
| 368 | if((errno == EINTR) || (errno == EAGAIN)) |
| 369 | return; |
| 370 | if(sk->errcb != NULL) |
| 371 | sk->errcb(sk, errno, sk->data); |
| 372 | closesock(sk); |
| 373 | return; |
| 374 | } |
| 375 | /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't |
| 376 | * have EOF), but rather an empty packet. I don't know if any |
| 377 | * other potential DGRAM protocols might have an EOF |
| 378 | * condition, so let's play safe. */ |
| 379 | if(ret == 0) |
| 380 | { |
| 381 | free(dbuf->addr); |
| 382 | free(dbuf->data); |
| 383 | free(dbuf); |
| 384 | if(!((sk->family == AF_INET) || (sk->family == AF_INET6))) |
| 385 | { |
| 386 | if(sk->errcb != NULL) |
| 387 | sk->errcb(sk, 0, sk->data); |
| 388 | closesock(sk); |
| 389 | } |
| 390 | return; |
| 391 | } |
| 392 | dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen); |
| 393 | dbuf->data = srealloc(dbuf->data, dbuf->size = ret); |
| 394 | dbuf->next = NULL; |
| 395 | if(sk->inbuf.d.l != NULL) |
| 396 | sk->inbuf.d.l->next = dbuf; |
| 397 | else |
| 398 | sk->inbuf.d.f = dbuf; |
| 399 | sk->inbuf.d.l = dbuf; |
| 400 | if(sk->readcb != NULL) |
| 401 | sk->readcb(sk, sk->data); |
| 402 | break; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | static void sockflush(struct socket *sk) |
| 407 | { |
| 408 | int ret; |
| 409 | struct dgrambuf *dbuf; |
| 410 | |
| 411 | switch(sk->type) |
| 412 | { |
| 413 | case SOCK_STREAM: |
| 414 | if(sk->isrealsocket) |
| 415 | ret = send(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL); |
| 416 | else |
| 417 | ret = write(sk->fd, sk->outbuf.s.buf, sk->outbuf.s.datasize); |
| 418 | if(ret < 0) |
| 419 | { |
| 420 | /* For now, assume transient error, since |
| 421 | * the socket is polled for errors */ |
| 422 | break; |
| 423 | } |
| 424 | if(ret > 0) |
| 425 | { |
| 426 | memmove(sk->outbuf.s.buf, ((char *)sk->outbuf.s.buf) + ret, sk->outbuf.s.datasize -= ret); |
| 427 | if(sk->writecb != NULL) |
| 428 | sk->writecb(sk, sk->data); |
| 429 | } |
| 430 | break; |
| 431 | case SOCK_DGRAM: |
| 432 | dbuf = sk->outbuf.d.f; |
| 433 | if((sk->outbuf.d.f = dbuf->next) == NULL) |
| 434 | sk->outbuf.d.l = NULL; |
| 435 | sendto(sk->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen); |
| 436 | free(dbuf->data); |
| 437 | free(dbuf->addr); |
| 438 | free(dbuf); |
| 439 | if(sk->writecb != NULL) |
| 440 | sk->writecb(sk, sk->data); |
| 441 | break; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | void closesock(struct socket *sk) |
| 446 | { |
| 447 | sk->state = SOCK_STL; |
| 448 | close(sk->fd); |
| 449 | sk->fd = -1; |
| 450 | sk->close = 0; |
| 451 | } |
| 452 | |
| 453 | void sockqueue(struct socket *sk, void *data, size_t size) |
| 454 | { |
| 455 | struct dgrambuf *new; |
| 456 | |
| 457 | if(sk->state == SOCK_STL) |
| 458 | return; |
| 459 | switch(sk->type) |
| 460 | { |
| 461 | case SOCK_STREAM: |
| 462 | sizebuf(&(sk->outbuf.s.buf), &(sk->outbuf.s.bufsize), sk->outbuf.s.datasize + size, 1, 1); |
| 463 | memcpy(sk->outbuf.s.buf + sk->outbuf.s.datasize, data, size); |
| 464 | sk->outbuf.s.datasize += size; |
| 465 | break; |
| 466 | case SOCK_DGRAM: |
| 467 | if(sk->remote == NULL) |
| 468 | return; |
| 469 | new = smalloc(sizeof(*new)); |
| 470 | new->next = NULL; |
| 471 | memcpy(new->data = smalloc(size), data, new->size = size); |
| 472 | memcpy(new->addr = smalloc(sk->remotelen), sk->remote, new->addrlen = sk->remotelen); |
| 473 | if(sk->outbuf.d.l == NULL) |
| 474 | { |
| 475 | sk->outbuf.d.l = sk->outbuf.d.f = new; |
| 476 | } else { |
| 477 | sk->outbuf.d.l->next = new; |
| 478 | sk->outbuf.d.l = new; |
| 479 | } |
| 480 | break; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | size_t sockgetdatalen(struct socket *sk) |
| 485 | { |
| 486 | struct dgrambuf *b; |
| 487 | size_t ret; |
| 488 | |
| 489 | switch(sk->type) |
| 490 | { |
| 491 | case SOCK_STREAM: |
| 492 | ret = sk->inbuf.s.datasize; |
| 493 | break; |
| 494 | case SOCK_DGRAM: |
| 495 | ret = 0; |
| 496 | for(b = sk->inbuf.d.f; b != NULL; b = b->next) |
| 497 | ret += b->size; |
| 498 | break; |
| 499 | } |
| 500 | return(ret); |
| 501 | } |
| 502 | |
| 503 | size_t sockqueuesize(struct socket *sk) |
| 504 | { |
| 505 | struct dgrambuf *b; |
| 506 | size_t ret; |
| 507 | |
| 508 | switch(sk->type) |
| 509 | { |
| 510 | case SOCK_STREAM: |
| 511 | ret = sk->outbuf.s.datasize; |
| 512 | break; |
| 513 | case SOCK_DGRAM: |
| 514 | ret = 0; |
| 515 | for(b = sk->outbuf.d.f; b != NULL; b = b->next) |
| 516 | ret += b->size; |
| 517 | break; |
| 518 | } |
| 519 | return(ret); |
| 520 | } |
| 521 | |
| 522 | struct socket *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
| 523 | { |
| 524 | struct socket *sk; |
| 347d6d76 |
525 | int intbuf; |
| d3372da9 |
526 | |
| 527 | if(confgetint("net", "mode") == 1) |
| 528 | { |
| 529 | errno = EOPNOTSUPP; |
| 530 | return(NULL); |
| 531 | } |
| 532 | /* I don't know if this is actually correct (it probably isn't), |
| 533 | * but since, at on least Linux systems, PF_* are specifically |
| 534 | * #define'd to their AF_* counterparts, it allows for a severely |
| 535 | * smoother implementation. If it breaks something on your |
| 536 | * platform, please tell me so. |
| 537 | */ |
| 538 | if(confgetint("net", "mode") == 0) |
| 539 | { |
| 540 | if((sk = mksock(name->sa_family, type)) == NULL) |
| 541 | return(NULL); |
| 542 | sk->state = SOCK_LST; |
| 347d6d76 |
543 | if(confgetint("net", "reuseaddr")) |
| 544 | { |
| 545 | intbuf = 1; |
| 546 | setsockopt(sk->fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf)); |
| 547 | } |
| d3372da9 |
548 | if(bind(sk->fd, name, namelen) < 0) |
| 549 | { |
| 550 | putsock(sk); |
| 551 | return(NULL); |
| 552 | } |
| 553 | if(listen(sk->fd, 16) < 0) |
| 554 | { |
| 555 | putsock(sk); |
| 556 | return(NULL); |
| 557 | } |
| 558 | sk->acceptcb = func; |
| 559 | sk->data = data; |
| 560 | return(sk); |
| 561 | } |
| 562 | errno = EOPNOTSUPP; |
| 563 | return(NULL); |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * The difference between netcslisten() and netcslistenlocal() is that |
| 568 | * netcslistenlocal() always listens on the local host, instead of |
| 569 | * following proxy/passive mode directions. It is suitable for eg. the |
| 570 | * UI channel, while the file sharing networks should, naturally, use |
| 571 | * netcslisten() instead. |
| 572 | */ |
| 573 | |
| 574 | struct socket *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct socket *, struct socket *, void *), void *data) |
| 575 | { |
| 576 | struct socket *sk; |
| 577 | |
| 578 | /* I don't know if this is actually correct (it probably isn't), |
| 579 | * but since, at on least Linux systems, PF_* are specifically |
| 580 | * #define'd to their AF_* counterparts, it allows for a severely |
| 581 | * smoother implementation. If it breaks something on your |
| 582 | * platform, please tell me so. |
| 583 | */ |
| 584 | if((sk = mksock(name->sa_family, type)) == NULL) |
| 585 | return(NULL); |
| 586 | sk->state = SOCK_LST; |
| 587 | if(bind(sk->fd, name, namelen) < 0) |
| 588 | { |
| 589 | putsock(sk); |
| 590 | return(NULL); |
| 591 | } |
| 592 | if(listen(sk->fd, 16) < 0) |
| 593 | { |
| 594 | putsock(sk); |
| 595 | return(NULL); |
| 596 | } |
| 597 | sk->acceptcb = func; |
| 598 | sk->data = data; |
| 599 | return(sk); |
| 600 | } |
| 601 | |
| 602 | struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen) |
| 603 | { |
| 604 | struct socket *sk; |
| 605 | int mode; |
| 606 | |
| 607 | mode = confgetint("net", "mode"); |
| 608 | if((mode == 0) || (mode == 1)) |
| 609 | { |
| 610 | if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL) |
| 611 | return(NULL); |
| 612 | if(bind(sk->fd, name, namelen) < 0) |
| 613 | { |
| 614 | putsock(sk); |
| 615 | return(NULL); |
| 616 | } |
| 617 | sk->state = SOCK_EST; |
| 618 | return(sk); |
| 619 | } |
| 620 | errno = EOPNOTSUPP; |
| 621 | return(NULL); |
| 622 | } |
| 623 | |
| 624 | struct socket *netdupsock(struct socket *sk) |
| 625 | { |
| 626 | struct socket *newsk; |
| 627 | |
| 628 | newsk = newsock(sk->type); |
| 629 | if((newsk->fd = dup(sk->fd)) < 0) |
| 630 | { |
| 631 | flog(LOG_WARNING, "could not dup() socket: %s", strerror(errno)); |
| 632 | putsock(newsk); |
| 633 | return(NULL); |
| 634 | } |
| 635 | newsk->state = sk->state; |
| 636 | newsk->ignread = sk->ignread; |
| 637 | if(sk->remote != NULL) |
| 638 | memcpy(newsk->remote = smalloc(sk->remotelen), sk->remote, newsk->remotelen = sk->remotelen); |
| 639 | return(newsk); |
| 640 | } |
| 641 | |
| 642 | void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen) |
| 643 | { |
| 644 | if(sk->remote != NULL) |
| 645 | free(sk->remote); |
| 646 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); |
| 647 | sk->ignread = 1; |
| 648 | } |
| 649 | |
| 650 | struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data) |
| 651 | { |
| 652 | struct socket *sk; |
| 653 | int mode; |
| 654 | |
| 655 | mode = confgetint("net", "mode"); |
| 656 | if((mode == 0) || (mode == 1)) |
| 657 | { |
| 658 | if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL) |
| 659 | return(NULL); |
| 660 | memcpy(sk->remote = smalloc(addrlen), addr, sk->remotelen = addrlen); |
| 661 | if(!connect(sk->fd, addr, addrlen)) |
| 662 | { |
| 663 | sk->state = SOCK_EST; |
| 664 | func(sk, 0, data); |
| 665 | return(sk); |
| 666 | } |
| 667 | if(errno == EINPROGRESS) |
| 668 | { |
| 669 | sk->state = SOCK_SYN; |
| 670 | sk->conncb = func; |
| 671 | sk->data = data; |
| 672 | return(sk); |
| 673 | } |
| 674 | putsock(sk); |
| 675 | return(NULL); |
| 676 | } |
| 677 | errno = EOPNOTSUPP; |
| 678 | return(NULL); |
| 679 | } |
| 680 | |
| 681 | int pollsocks(int timeout) |
| 682 | { |
| 683 | int i, num, ret, retlen; |
| 684 | int newfd; |
| 685 | struct pollfd *pfds; |
| 686 | struct socket *sk, *next, *newsk; |
| 687 | struct sockaddr_storage ss; |
| 688 | socklen_t sslen; |
| 689 | |
| 690 | pfds = smalloc(sizeof(*pfds) * (num = numsocks)); |
| 691 | for(i = 0, sk = sockets; i < num; sk = sk->next) |
| 692 | { |
| 693 | if(sk->state == SOCK_STL) |
| 694 | { |
| 695 | num--; |
| 696 | continue; |
| 697 | } |
| 698 | pfds[i].fd = sk->fd; |
| 699 | pfds[i].events = 0; |
| 700 | if(!sk->ignread) |
| 701 | pfds[i].events |= POLLIN; |
| 702 | if((sk->state == SOCK_SYN) || (sockqueuesize(sk) > 0)) |
| 703 | pfds[i].events |= POLLOUT; |
| 704 | pfds[i].revents = 0; |
| 705 | i++; |
| 706 | } |
| 707 | ret = poll(pfds, num, timeout); |
| 708 | if(ret < 0) |
| 709 | { |
| 710 | if(errno != EINTR) |
| 711 | { |
| 712 | flog(LOG_CRIT, "pollsocks: poll errored out: %s", strerror(errno)); |
| 713 | /* To avoid CPU hogging in case it's bad, which it |
| 714 | * probably is. */ |
| 715 | sleep(1); |
| 716 | } |
| 717 | free(pfds); |
| 718 | return(1); |
| 719 | } |
| 720 | for(sk = sockets; sk != NULL; sk = next) |
| 721 | { |
| 722 | next = sk->next; |
| 723 | for(i = 0; i < num; i++) |
| 724 | { |
| 725 | if(pfds[i].fd == sk->fd) |
| 726 | break; |
| 727 | } |
| 728 | if(i == num) |
| 729 | continue; |
| 730 | switch(sk->state) |
| 731 | { |
| 732 | case SOCK_LST: |
| 733 | if(pfds[i].revents & POLLIN) |
| 734 | { |
| 735 | sslen = sizeof(ss); |
| 736 | if((newfd = accept(sk->fd, (struct sockaddr *)&ss, &sslen)) < 0) |
| 737 | { |
| 738 | if(sk->errcb != NULL) |
| 739 | sk->errcb(sk, errno, sk->data); |
| 740 | } |
| 741 | newsk = newsock(sk->type); |
| 742 | newsk->fd = newfd; |
| 743 | newsk->family = sk->family; |
| 744 | newsk->state = SOCK_EST; |
| 745 | memcpy(newsk->remote = smalloc(sslen), &ss, sslen); |
| 746 | newsk->remotelen = sslen; |
| 747 | putsock(newsk); |
| 748 | if(sk->acceptcb != NULL) |
| 749 | sk->acceptcb(sk, newsk, sk->data); |
| 750 | } |
| 751 | if(pfds[i].revents & POLLERR) |
| 752 | { |
| 753 | retlen = sizeof(ret); |
| 754 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 755 | if(sk->errcb != NULL) |
| 756 | sk->errcb(sk, ret, sk->data); |
| 757 | continue; |
| 758 | } |
| 759 | break; |
| 760 | case SOCK_SYN: |
| 761 | if(pfds[i].revents & POLLERR) |
| 762 | { |
| 763 | retlen = sizeof(ret); |
| 764 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 765 | if(sk->conncb != NULL) |
| 766 | sk->conncb(sk, ret, sk->data); |
| 767 | closesock(sk); |
| 768 | continue; |
| 769 | } |
| 770 | if(pfds[i].revents & (POLLIN | POLLOUT)) |
| 771 | { |
| 772 | sk->state = SOCK_EST; |
| 773 | if(sk->conncb != NULL) |
| 774 | sk->conncb(sk, 0, sk->data); |
| 775 | } |
| 776 | break; |
| 777 | case SOCK_EST: |
| 778 | if(pfds[i].revents & POLLERR) |
| 779 | { |
| 780 | retlen = sizeof(ret); |
| 781 | getsockopt(sk->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 782 | if(sk->errcb != NULL) |
| 783 | sk->errcb(sk, ret, sk->data); |
| 784 | closesock(sk); |
| 785 | continue; |
| 786 | } |
| 787 | if(pfds[i].revents & POLLIN) |
| 788 | sockrecv(sk); |
| 789 | if(pfds[i].revents & POLLOUT) |
| 790 | { |
| 791 | if(sockqueuesize(sk) > 0) |
| 792 | sockflush(sk); |
| 793 | } |
| 794 | break; |
| 795 | } |
| 796 | if(pfds[i].revents & POLLNVAL) |
| 797 | { |
| 798 | flog(LOG_CRIT, "BUG: stale socket struct on fd %i", sk->fd); |
| 799 | sk->state = SOCK_STL; |
| 800 | unlinksock(sk); |
| 801 | continue; |
| 802 | } |
| 803 | if(pfds[i].revents & POLLHUP) |
| 804 | { |
| 805 | if(sk->errcb != NULL) |
| 806 | sk->errcb(sk, 0, sk->data); |
| 807 | closesock(sk); |
| 808 | unlinksock(sk); |
| 809 | continue; |
| 810 | } |
| 811 | } |
| 812 | free(pfds); |
| 813 | for(sk = sockets; sk != NULL; sk = next) |
| 814 | { |
| 815 | next = sk->next; |
| 816 | if(sk->refcount == 1 && (sockqueuesize(sk) == 0)) |
| 817 | { |
| 818 | unlinksock(sk); |
| 819 | continue; |
| 820 | } |
| 821 | if(sk->close && (sockqueuesize(sk) == 0)) |
| 822 | closesock(sk); |
| 823 | if(sk->state == SOCK_STL) |
| 824 | { |
| 825 | unlinksock(sk); |
| 826 | continue; |
| 827 | } |
| 828 | } |
| 829 | return(1); |
| 830 | } |
| 831 | |
| 832 | int socksettos(struct socket *sk, int tos) |
| 833 | { |
| 834 | if(sk->family == AF_INET) |
| 835 | { |
| 836 | if(setsockopt(sk->fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0) |
| 837 | { |
| 838 | flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno)); |
| 839 | return(-1); |
| 840 | } |
| 841 | return(0); |
| 842 | } |
| 843 | /* XXX: How does the IPv6 traffic class work? */ |
| 844 | flog(LOG_WARNING, "could not set TOS on sock of family %i", sk->family); |
| 845 | return(1); |
| 846 | } |
| 847 | |
| 848 | struct resolvedata |
| 849 | { |
| 850 | int fd; |
| 851 | void (*callback)(struct sockaddr *addr, int addrlen, void *data); |
| 852 | void *data; |
| 853 | struct sockaddr_storage addr; |
| 854 | int addrlen; |
| 855 | }; |
| 856 | |
| 857 | static void resolvecb(pid_t pid, int status, struct resolvedata *data) |
| 858 | { |
| 859 | static char buf[80]; |
| 860 | int ret; |
| 861 | struct sockaddr_in *ipv4; |
| 862 | |
| 863 | if(!status) |
| 864 | { |
| 865 | if((ret = read(data->fd, buf, sizeof(buf))) != 4) |
| 866 | { |
| 867 | errno = ENONET; |
| 868 | data->callback(NULL, 0, data->data); |
| 869 | } else { |
| 870 | ipv4 = (struct sockaddr_in *)&data->addr; |
| 871 | memcpy(&ipv4->sin_addr, buf, 4); |
| 872 | data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data); |
| 873 | } |
| 874 | } else { |
| 875 | errno = ENONET; |
| 876 | data->callback(NULL, 0, data->data); |
| 877 | } |
| 878 | close(data->fd); |
| 879 | free(data); |
| 880 | } |
| 881 | |
| 882 | int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data) |
| 883 | { |
| 884 | int i; |
| 885 | char *p; |
| 886 | int port; |
| 887 | int pfd[2]; |
| 888 | pid_t child; |
| 889 | struct resolvedata *rdata; |
| 890 | struct sockaddr_in ipv4; |
| 891 | struct hostent *he; |
| 892 | sigset_t sigset; |
| 893 | |
| 894 | /* IPv4 */ |
| 895 | port = -1; |
| 896 | if((p = strchr(addr, ':')) != NULL) |
| 897 | { |
| 898 | *p = 0; |
| 899 | port = atoi(p + 1); |
| 900 | } |
| 901 | ipv4.sin_family = AF_INET; |
| 902 | ipv4.sin_port = htons(port); |
| 903 | if(inet_aton(addr, &ipv4.sin_addr)) |
| 904 | { |
| 905 | callback((struct sockaddr *)&ipv4, sizeof(ipv4), data); |
| 906 | } else { |
| 907 | sigemptyset(&sigset); |
| 908 | sigaddset(&sigset, SIGCHLD); |
| 909 | sigprocmask(SIG_BLOCK, &sigset, NULL); |
| 910 | if((pipe(pfd) < 0) || ((child = fork()) < 0)) |
| 911 | { |
| 912 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 913 | return(-1); |
| 914 | } |
| 915 | if(child == 0) |
| 916 | { |
| 917 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 918 | for(i = 3; i < FD_SETSIZE; i++) |
| 919 | { |
| 920 | if(i != pfd[1]) |
| 921 | close(i); |
| 922 | } |
| 923 | signal(SIGALRM, SIG_DFL); |
| 924 | alarm(30); |
| 925 | if((he = gethostbyname(addr)) == NULL) |
| 926 | exit(1); |
| 927 | write(pfd[1], he->h_addr_list[0], 4); |
| 928 | exit(0); |
| 929 | } else { |
| 930 | close(pfd[1]); |
| 931 | fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK); |
| 932 | rdata = smalloc(sizeof(*rdata)); |
| 933 | rdata->fd = pfd[0]; |
| 934 | rdata->callback = callback; |
| 935 | rdata->data = data; |
| 936 | memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4)); |
| 937 | childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata); |
| 938 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 939 | return(1); |
| 940 | } |
| 941 | } |
| 942 | return(0); |
| 943 | } |
| 944 | |
| 945 | int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 946 | { |
| 947 | socklen_t len; |
| 948 | struct sockaddr_storage name; |
| 949 | |
| 950 | *namebuf = NULL; |
| 951 | if((sk->state == SOCK_STL) || (sk->fd < 0)) |
| 952 | return(-1); |
| 953 | len = sizeof(name); |
| 954 | if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0) |
| 955 | { |
| 956 | flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname"); |
| 957 | return(-1); |
| 958 | } |
| 959 | *namebuf = memcpy(smalloc(len), &name, len); |
| 960 | *lenbuf = len; |
| 961 | return(0); |
| 962 | } |
| 963 | |
| 964 | int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 965 | { |
| 966 | socklen_t len; |
| 967 | struct sockaddr_storage name; |
| 968 | struct sockaddr_in *ipv4; |
| 969 | struct sockaddr *pname; |
| 970 | socklen_t pnamelen; |
| 971 | |
| 972 | switch(confgetint("net", "mode")) |
| 973 | { |
| 974 | case 0: |
| 975 | *namebuf = NULL; |
| 976 | if((sk->state == SOCK_STL) || (sk->fd < 0)) |
| 977 | return(-1); |
| 978 | len = sizeof(name); |
| 979 | if(getsockname(sk->fd, (struct sockaddr *)&name, &len) < 0) |
| 980 | { |
| 981 | flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetremotename"); |
| 982 | return(-1); |
| 983 | } |
| 984 | if(name.ss_family == AF_INET) |
| 985 | { |
| 986 | ipv4 = (struct sockaddr_in *)&name; |
| 987 | if(getpublicaddr(AF_INET, &pname, &pnamelen) < 0) |
| 988 | { |
| 989 | flog(LOG_WARNING, "could not determine public IP address - strange things may happen"); |
| 990 | return(-1); |
| 991 | } |
| 992 | ipv4->sin_addr.s_addr = ((struct sockaddr_in *)pname)->sin_addr.s_addr; |
| 993 | free(pname); |
| 994 | } |
| 995 | *namebuf = memcpy(smalloc(len), &name, len); |
| 996 | *lenbuf = len; |
| 997 | return(0); |
| 998 | case 1: |
| 999 | errno = EOPNOTSUPP; |
| 1000 | return(-1); |
| 1001 | default: |
| 1002 | flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode")); |
| 1003 | errno = EOPNOTSUPP; |
| 1004 | return(-1); |
| 1005 | } |
| 1006 | } |
| 1007 | |
| 1008 | char *formataddress(struct sockaddr *arg, socklen_t arglen) |
| 1009 | { |
| 1010 | struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with |
| 1011 | * lowercase letters to 1, so I do this |
| 1012 | * instead. */ |
| 1013 | struct sockaddr_in *ipv4; |
| 1014 | #ifdef HAVE_IPV6 |
| 1015 | struct sockaddr_in6 *ipv6; |
| 1016 | #endif |
| 1017 | static char *ret = NULL; |
| 1018 | char buf[1024]; |
| 1019 | |
| 1020 | if(ret != NULL) |
| 1021 | free(ret); |
| 1022 | ret = NULL; |
| 1023 | switch(arg->sa_family) |
| 1024 | { |
| 1025 | case AF_UNIX: |
| 1026 | UNIX = (struct sockaddr_un *)arg; |
| 1027 | ret = sprintf2("%s", UNIX->sun_path); |
| 1028 | break; |
| 1029 | case AF_INET: |
| 1030 | ipv4 = (struct sockaddr_in *)arg; |
| 1031 | if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL) |
| 1032 | return(NULL); |
| 1033 | ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port)); |
| 1034 | break; |
| 1035 | #ifdef HAVE_IPV6 |
| 1036 | case AF_INET6: |
| 1037 | ipv6 = (struct sockaddr_in6 *)arg; |
| 1038 | if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL) |
| 1039 | return(NULL); |
| 1040 | ret = sprintf2("%s:%i", buf, (int)ntohs(ipv6->sin6_port)); |
| 1041 | break; |
| 1042 | #endif |
| 1043 | default: |
| 1044 | errno = EPFNOSUPPORT; |
| 1045 | break; |
| 1046 | } |
| 1047 | return(ret); |
| 1048 | } |
| 1049 | |
| 1050 | #if 0 |
| 1051 | |
| 1052 | /* |
| 1053 | * It was very nice to use this, but it seems |
| 1054 | * to mess things up, so I guess it has to go... :-( |
| 1055 | */ |
| 1056 | |
| 1057 | static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args) |
| 1058 | { |
| 1059 | struct sockaddr *arg; |
| 1060 | socklen_t arglen; |
| 1061 | struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with |
| 1062 | * lowercase letters to 1, so I do this |
| 1063 | * instead. */ |
| 1064 | struct sockaddr_in *ipv4; |
| 1065 | int ret; |
| 1066 | |
| 1067 | arg = *(struct sockaddr **)(args[0]); |
| 1068 | arglen = *(socklen_t *)(args[1]); |
| 1069 | switch(arg->sa_family) |
| 1070 | { |
| 1071 | case AF_UNIX: |
| 1072 | UNIX = (struct sockaddr_un *)arg; |
| 1073 | ret = fprintf(stream, "%s", UNIX->sun_path); |
| 1074 | break; |
| 1075 | case AF_INET: |
| 1076 | ipv4 = (struct sockaddr_in *)arg; |
| 1077 | ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port)); |
| 1078 | break; |
| 1079 | default: |
| 1080 | ret = -1; |
| 1081 | errno = EPFNOSUPPORT; |
| 1082 | break; |
| 1083 | } |
| 1084 | return(ret); |
| 1085 | } |
| 1086 | |
| 1087 | static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes) |
| 1088 | { |
| 1089 | if(n > 0) |
| 1090 | argtypes[0] = PA_POINTER; |
| 1091 | if(n > 1) |
| 1092 | argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_ |
| 1093 | * be an int, so I guess this should be |
| 1094 | * safe. */ |
| 1095 | return(2); |
| 1096 | } |
| 1097 | #endif |
| 1098 | |
| 1099 | static int init(int hup) |
| 1100 | { |
| 1101 | if(!hup) |
| 1102 | { |
| 1103 | /* |
| 1104 | if(register_printf_function('N', formataddress, formataddress_arginfo)) |
| 1105 | { |
| 1106 | flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno)); |
| 1107 | return(1); |
| 1108 | } |
| 1109 | */ |
| 1110 | } |
| 1111 | return(0); |
| 1112 | } |
| 1113 | |
| 1114 | static void terminate(void) |
| 1115 | { |
| 1116 | while(sockets != NULL) |
| 1117 | unlinksock(sockets); |
| 1118 | } |
| 1119 | |
| 1120 | static struct module me = |
| 1121 | { |
| 1122 | .name = "net", |
| 1123 | .conf = |
| 1124 | { |
| 1125 | .vars = myvars |
| 1126 | }, |
| 1127 | .init = init, |
| 1128 | .terminate = terminate |
| 1129 | }; |
| 1130 | |
| 1131 | MODULE(me) |
Dolda2000 GitWeb / doldaconnect.git / blame