| 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/select.h> |
| 32 | #include <arpa/inet.h> |
| 33 | #include <netinet/in.h> |
| 34 | #include <netdb.h> |
| 35 | #include <sys/signal.h> |
| 36 | #include <sys/stat.h> /* For rebindunix() */ |
| 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 | /** The network mode to use. Currently supported values are 0 for |
| 53 | * active mode and 1 for passive mode. In the future, SOCKS5 proxy |
| 54 | * support may be added. */ |
| 55 | {CONF_VAR_INT, "mode", {.num = 0}}, |
| 56 | /** Set the SO_REUSEADDR socket option on listening sockets, so |
| 57 | * that dead TCP connections waiting for timeout are ignored. */ |
| 58 | {CONF_VAR_BOOL, "reuseaddr", {.num = 0}}, |
| 59 | /** Overrides the IPv4 address reported to other clients in active |
| 60 | * mode. Useful for servers behind NAT routers. If both this and |
| 61 | * net.publicif are unspecified the address of the hub connection |
| 62 | * is used. */ |
| 63 | {CONF_VAR_IPV4, "visibleipv4", {.ipv4 = {0}}}, |
| 64 | /** Specifies an interface name from which to fetch the IPv4 |
| 65 | * address reported to other clients in active mode. If both this |
| 66 | * and net.visibleipv4 are unspecified the address of the hub |
| 67 | * connection is used. */ |
| 68 | {CONF_VAR_STRING, "publicif", {.str = L""}}, |
| 69 | /** The Diffserv value to use on IPv6 connections when the |
| 70 | * minimize cost TOS value is used (see the TOS VALUES |
| 71 | * section). */ |
| 72 | {CONF_VAR_INT, "diffserv-mincost", {.num = 0}}, |
| 73 | /** The Diffserv value to use on IPv6 connections when the |
| 74 | * maximize reliability TOS value is used (see the TOS VALUES |
| 75 | * section). */ |
| 76 | {CONF_VAR_INT, "diffserv-maxrel", {.num = 0}}, |
| 77 | /** The Diffserv value to use on IPv6 connections when the |
| 78 | * maximize throughput TOS value is used (see the TOS VALUES |
| 79 | * section). */ |
| 80 | {CONF_VAR_INT, "diffserv-maxtp", {.num = 0}}, |
| 81 | /** The Diffserv value to use on IPv6 connections when the |
| 82 | * minimize delay TOS value is used (see the TOS VALUES |
| 83 | * section). */ |
| 84 | {CONF_VAR_INT, "diffserv-mindelay", {.num = 0}}, |
| 85 | /** If enabled, the IP TOS interface will be used to set Diffserv |
| 86 | * codepoints on IPv4 sockets, by shifting the DSCP value two bits |
| 87 | * to the left (remember, the DSCP field in the IPv4 header is |
| 88 | * defined as the 6 uppermost bits of the TOS field, the lower two |
| 89 | * being left for ECN). This may only work on Linux. */ |
| 90 | {CONF_VAR_BOOL, "dscp-tos", {.num = 0}}, |
| 91 | {CONF_VAR_END} |
| 92 | }; |
| 93 | |
| 94 | #define UFD_SOCK 0 |
| 95 | #define UFD_PIPE 1 |
| 96 | #define UFD_LISTEN 2 |
| 97 | |
| 98 | struct scons { |
| 99 | struct scons *n, *p; |
| 100 | struct socket *s; |
| 101 | }; |
| 102 | |
| 103 | struct ufd { |
| 104 | struct ufd *next, *prev; |
| 105 | int fd; |
| 106 | int type; |
| 107 | int ignread; |
| 108 | struct socket *sk; |
| 109 | union { |
| 110 | struct { |
| 111 | int family; |
| 112 | int type; |
| 113 | struct sockaddr *remote; |
| 114 | socklen_t remotelen; |
| 115 | struct { |
| 116 | uid_t uid; |
| 117 | gid_t gid; |
| 118 | } ucred; |
| 119 | } s; |
| 120 | struct { |
| 121 | struct lport *lp; |
| 122 | int family; |
| 123 | } l; |
| 124 | } d; |
| 125 | }; |
| 126 | |
| 127 | static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf); |
| 128 | |
| 129 | static struct ufd *ufds = NULL; |
| 130 | static struct scons *rbatch, *wbatch, *cbatch; |
| 131 | int numsocks = 0; |
| 132 | |
| 133 | /* XXX: Get autoconf for all this... */ |
| 134 | int getpublicaddr(int af, struct sockaddr **addr, socklen_t *lenbuf) |
| 135 | { |
| 136 | struct sockaddr_in *ipv4; |
| 137 | struct configvar *var; |
| 138 | void *bufend; |
| 139 | int sock; |
| 140 | struct ifconf conf; |
| 141 | struct ifreq *ifr, req; |
| 142 | char *pif; |
| 143 | |
| 144 | if(af == AF_INET) |
| 145 | { |
| 146 | var = confgetvar("net", "visibleipv4"); |
| 147 | if(var->val.ipv4.s_addr != 0) |
| 148 | { |
| 149 | ipv4 = smalloc(sizeof(*ipv4)); |
| 150 | ipv4->sin_family = AF_INET; |
| 151 | ipv4->sin_addr.s_addr = var->val.ipv4.s_addr; |
| 152 | *addr = (struct sockaddr *)ipv4; |
| 153 | *lenbuf = sizeof(*ipv4); |
| 154 | return(0); |
| 155 | } |
| 156 | if((pif = icswcstombs(confgetstr("net", "publicif"), NULL, NULL)) == NULL) |
| 157 | { |
| 158 | flog(LOG_ERR, "could not convert net.publicif into local charset: %s", strerror(errno)); |
| 159 | return(-1); |
| 160 | } |
| 161 | if(!strcmp(pif, "")) |
| 162 | return(1); |
| 163 | if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
| 164 | return(-1); |
| 165 | conf.ifc_buf = smalloc(conf.ifc_len = 65536); |
| 166 | if(ioctl(sock, SIOCGIFCONF, &conf) < 0) |
| 167 | { |
| 168 | free(conf.ifc_buf); |
| 169 | close(sock); |
| 170 | return(-1); |
| 171 | } |
| 172 | bufend = ((char *)conf.ifc_buf) + conf.ifc_len; |
| 173 | ipv4 = NULL; |
| 174 | for(ifr = conf.ifc_ifcu.ifcu_req; (void *)ifr < bufend; ifr++) |
| 175 | { |
| 176 | if(strcmp(ifr->ifr_name, pif)) |
| 177 | continue; |
| 178 | memset(&req, 0, sizeof(req)); |
| 179 | memcpy(req.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name)); |
| 180 | if(ioctl(sock, SIOCGIFFLAGS, &req) < 0) |
| 181 | break; |
| 182 | if(!(req.ifr_flags & IFF_UP)) |
| 183 | { |
| 184 | flog(LOG_WARNING, "public interface is down"); |
| 185 | break; |
| 186 | } |
| 187 | if(ifr->ifr_addr.sa_family != AF_INET) |
| 188 | { |
| 189 | flog(LOG_WARNING, "address of the public interface is not AF_INET"); |
| 190 | break; |
| 191 | } |
| 192 | ipv4 = smalloc(sizeof(*ipv4)); |
| 193 | memcpy(ipv4, &ifr->ifr_addr, sizeof(ifr->ifr_addr)); |
| 194 | break; |
| 195 | } |
| 196 | free(conf.ifc_buf); |
| 197 | close(sock); |
| 198 | if(ipv4 != NULL) |
| 199 | { |
| 200 | *addr = (struct sockaddr *)ipv4; |
| 201 | *lenbuf = sizeof(*ipv4); |
| 202 | return(0); |
| 203 | } |
| 204 | errno = ENETDOWN; |
| 205 | return(-1); |
| 206 | } |
| 207 | return(1); |
| 208 | } |
| 209 | |
| 210 | static struct socket *newsock1(int dgram) |
| 211 | { |
| 212 | struct socket *new; |
| 213 | |
| 214 | new = memset(smalloc(sizeof(*new)), 0, sizeof(*new)); |
| 215 | new->refcount = 1; |
| 216 | new->state = -1; |
| 217 | new->dgram = dgram; |
| 218 | new->maxbuf = 65536; |
| 219 | numsocks++; |
| 220 | return(new); |
| 221 | } |
| 222 | |
| 223 | static struct socket *sockpair(int dgram) |
| 224 | { |
| 225 | struct socket *s1, *s2; |
| 226 | |
| 227 | s1 = newsock1(dgram); |
| 228 | s2 = newsock1(dgram); |
| 229 | s1->back = s2; |
| 230 | s2->back = s1; |
| 231 | putsock(s2); |
| 232 | return(s1); |
| 233 | } |
| 234 | |
| 235 | static void sksetstate(struct socket *sk, int state) |
| 236 | { |
| 237 | sk->state = state; |
| 238 | sk->back->state = state; |
| 239 | } |
| 240 | |
| 241 | struct socket *netsockpipe(void) |
| 242 | { |
| 243 | struct socket *sk; |
| 244 | |
| 245 | sk = sockpair(0); |
| 246 | sksetstate(sk, SOCK_EST); |
| 247 | return(sk); |
| 248 | } |
| 249 | |
| 250 | static void closeufd(struct ufd *ufd) |
| 251 | { |
| 252 | if(ufd->fd != -1) |
| 253 | close(ufd->fd); |
| 254 | ufd->fd = -1; |
| 255 | } |
| 256 | |
| 257 | static void freeufd(struct ufd *ufd) |
| 258 | { |
| 259 | if(ufd->next != NULL) |
| 260 | ufd->next->prev = ufd->prev; |
| 261 | if(ufd->prev != NULL) |
| 262 | ufd->prev->next = ufd->next; |
| 263 | if(ufd == ufds) |
| 264 | ufds = ufd->next; |
| 265 | closeufd(ufd); |
| 266 | if(ufd->sk != NULL) |
| 267 | putsock(ufd->sk); |
| 268 | if(ufd->type == UFD_SOCK) { |
| 269 | if(ufd->d.s.remote != NULL) |
| 270 | free(ufd->d.s.remote); |
| 271 | } |
| 272 | free(ufd); |
| 273 | } |
| 274 | |
| 275 | static struct ufd *mkufd(int fd, int type, struct socket *sk) |
| 276 | { |
| 277 | struct ufd *ufd; |
| 278 | |
| 279 | ufd = memset(smalloc(sizeof(*ufd)), 0, sizeof(*ufd)); |
| 280 | ufd->fd = fd; |
| 281 | ufd->type = type; |
| 282 | if(sk != NULL) { |
| 283 | getsock(ufd->sk = sk); |
| 284 | sk->ufd = ufd; |
| 285 | } |
| 286 | if(type == UFD_SOCK) { |
| 287 | ufd->d.s.ucred.uid = -1; |
| 288 | ufd->d.s.ucred.gid = -1; |
| 289 | } |
| 290 | ufd->next = ufds; |
| 291 | if(ufds) |
| 292 | ufds->prev = ufd; |
| 293 | ufds = ufd; |
| 294 | return(ufd); |
| 295 | } |
| 296 | |
| 297 | static struct ufd *dupufd(struct ufd *ufd) |
| 298 | { |
| 299 | struct ufd *nufd; |
| 300 | struct socket *nsk; |
| 301 | |
| 302 | if(ufd->sk != NULL) |
| 303 | nsk = sockpair(ufd->sk->dgram); |
| 304 | else |
| 305 | nsk = NULL; |
| 306 | nufd = mkufd(ufd->fd, ufd->type, nsk); |
| 307 | if(nsk != NULL) |
| 308 | putsock(nsk); |
| 309 | if((nufd->fd = dup(ufd->fd)) < 0) |
| 310 | { |
| 311 | flog(LOG_WARNING, "could not dup() fd: %s", strerror(errno)); |
| 312 | freeufd(nufd); |
| 313 | return(NULL); |
| 314 | } |
| 315 | sksetstate(nsk, SOCK_EST); |
| 316 | if(ufd->type == UFD_SOCK) { |
| 317 | nufd->d.s.family = ufd->d.s.family; |
| 318 | nufd->d.s.type = ufd->d.s.type; |
| 319 | nufd->d.s.ucred.uid = ufd->d.s.ucred.uid; |
| 320 | nufd->d.s.ucred.gid = ufd->d.s.ucred.gid; |
| 321 | if(ufd->d.s.remote != NULL) |
| 322 | nufd->d.s.remote = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, nufd->d.s.remotelen = ufd->d.s.remotelen); |
| 323 | } else if(ufd->type == UFD_LISTEN) { |
| 324 | nufd->d.l.family = ufd->d.l.family; |
| 325 | } |
| 326 | return(nufd); |
| 327 | } |
| 328 | |
| 329 | static struct socket *mksock(int domain, int type) |
| 330 | { |
| 331 | int fd; |
| 332 | struct socket *sk; |
| 333 | struct ufd *ufd; |
| 334 | |
| 335 | if((fd = socket(domain, type, 0)) < 0) |
| 336 | { |
| 337 | flog(LOG_CRIT, "could not create socket: %s", strerror(errno)); |
| 338 | return(NULL); |
| 339 | } |
| 340 | sk = sockpair(type == SOCK_DGRAM); |
| 341 | ufd = mkufd(fd, UFD_SOCK, sk); |
| 342 | ufd->d.s.family = domain; |
| 343 | ufd->d.s.type = type; |
| 344 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 345 | return(sk); |
| 346 | } |
| 347 | |
| 348 | struct socket *wrapsock(int fd) |
| 349 | { |
| 350 | struct socket *sk; |
| 351 | struct ufd *ufd; |
| 352 | |
| 353 | sk = sockpair(0); |
| 354 | ufd = mkufd(fd, UFD_PIPE, sk->back); |
| 355 | sksetstate(sk, SOCK_EST); |
| 356 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 357 | return(sk); |
| 358 | } |
| 359 | |
| 360 | void getsock(struct socket *sk) |
| 361 | { |
| 362 | sk->refcount++; |
| 363 | } |
| 364 | |
| 365 | static void sockdebug(int level, struct socket *sk, char *format, ...) |
| 366 | { |
| 367 | va_list args; |
| 368 | char *tb; |
| 369 | |
| 370 | if((sk->dbgnm == NULL) || (level > sk->dbglvl)) |
| 371 | return; |
| 372 | va_start(args, format); |
| 373 | tb = vsprintf2(format, args); |
| 374 | va_end(args); |
| 375 | fprintf(stderr, "%s: %s\n", sk->dbgnm, tb); |
| 376 | free(tb); |
| 377 | } |
| 378 | |
| 379 | void socksetdebug(struct socket *sk, int level, char *nm, ...) |
| 380 | { |
| 381 | va_list args; |
| 382 | char *tb; |
| 383 | |
| 384 | va_start(args, nm); |
| 385 | tb = vsprintf2(nm, args); |
| 386 | va_end(args); |
| 387 | sk->dbgnm = sprintf2("%s (f)", tb); |
| 388 | sk->back->dbgnm = sprintf2("%s (b)", tb); |
| 389 | free(tb); |
| 390 | sk->dbglvl = level; |
| 391 | sk->back->dbglvl = level; |
| 392 | sockdebug(1, sk, "enabled debugging"); |
| 393 | } |
| 394 | |
| 395 | static void freesock(struct socket *sk) |
| 396 | { |
| 397 | struct dgrambuf *buf; |
| 398 | |
| 399 | sockdebug(1, sk, "freeing socket"); |
| 400 | if(sk->dgram) { |
| 401 | while((buf = sk->buf.d.f) != NULL) { |
| 402 | sk->buf.d.f = buf->next; |
| 403 | freedgbuf(buf); |
| 404 | } |
| 405 | } else { |
| 406 | if(sk->buf.s.buf != NULL) |
| 407 | free(sk->buf.s.buf); |
| 408 | } |
| 409 | if(sk->dbgnm != NULL) |
| 410 | free(sk->dbgnm); |
| 411 | free(sk); |
| 412 | numsocks--; |
| 413 | } |
| 414 | |
| 415 | void putsock(struct socket *sk) |
| 416 | { |
| 417 | struct socket *back; |
| 418 | |
| 419 | if(--(sk->refcount) < 0) { |
| 420 | flog(LOG_CRIT, "BUG: socket refcount < 0"); |
| 421 | abort(); |
| 422 | } |
| 423 | if((sk->refcount == 0) && (sk->back->refcount == 0)) { |
| 424 | back = sk->back; |
| 425 | freesock(sk); |
| 426 | freesock(back); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | void quitsock(struct socket *sk) |
| 431 | { |
| 432 | sk->readcb = NULL; |
| 433 | sk->writecb = NULL; |
| 434 | sk->errcb = NULL; |
| 435 | putsock(sk); |
| 436 | } |
| 437 | |
| 438 | static void linksock(struct scons **list, struct socket *sk) |
| 439 | { |
| 440 | struct scons *sc; |
| 441 | |
| 442 | for(sc = *list; sc != NULL; sc = sc->n) { |
| 443 | if(sc->s == sk) |
| 444 | return; |
| 445 | } |
| 446 | sc = smalloc(sizeof(*sc)); |
| 447 | getsock(sc->s = sk); |
| 448 | sc->n = *list; |
| 449 | sc->p = NULL; |
| 450 | if(*list) |
| 451 | (*list)->p = sc; |
| 452 | *list = sc; |
| 453 | } |
| 454 | |
| 455 | void sockpushdata(struct socket *sk, void *buf, size_t size) |
| 456 | { |
| 457 | if(size == 0) |
| 458 | return; |
| 459 | if(sk->dgram) { |
| 460 | /* XXX */ |
| 461 | } else { |
| 462 | sizebuf(&sk->buf.s.buf, &sk->buf.s.bufsize, sk->buf.s.datasize + size, 1, 1); |
| 463 | memmove(sk->buf.s.buf + size, sk->buf.s.buf, sk->buf.s.datasize); |
| 464 | memcpy(sk->buf.s.buf, buf, size); |
| 465 | sk->buf.s.datasize += size; |
| 466 | linksock(&rbatch, sk); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | /* Read as the preterite of `read' */ |
| 471 | void sockread(struct socket *sk) |
| 472 | { |
| 473 | if((sockgetdatalen(sk) == 0) && (sk->eos == 1)) |
| 474 | linksock(&rbatch, sk); |
| 475 | linksock(&wbatch, sk->back); |
| 476 | } |
| 477 | |
| 478 | void freedgbuf(struct dgrambuf *dg) |
| 479 | { |
| 480 | if(dg->data != NULL) |
| 481 | free(dg->data); |
| 482 | if(dg->addr != NULL) |
| 483 | free(dg->addr); |
| 484 | free(dg); |
| 485 | } |
| 486 | |
| 487 | struct dgrambuf *sockgetdgbuf(struct socket *sk) |
| 488 | { |
| 489 | struct dgrambuf *dbuf; |
| 490 | |
| 491 | if((dbuf = sk->buf.d.f) == NULL) |
| 492 | return(NULL); |
| 493 | sk->buf.d.f = dbuf->next; |
| 494 | if(dbuf->next == NULL) |
| 495 | sk->buf.d.l = NULL; |
| 496 | dbuf->next = NULL; |
| 497 | sockread(sk); |
| 498 | return(dbuf); |
| 499 | } |
| 500 | |
| 501 | void *sockgetinbuf(struct socket *sk, size_t *size) |
| 502 | { |
| 503 | void *buf; |
| 504 | struct dgrambuf *dbuf; |
| 505 | |
| 506 | if(sk->dgram) { |
| 507 | dbuf = sockgetdgbuf(sk); |
| 508 | buf = dbuf->data; |
| 509 | *size = dbuf->size; |
| 510 | free(dbuf->addr); |
| 511 | free(dbuf); |
| 512 | } else { |
| 513 | if((sk->buf.s.buf == NULL) || (sk->buf.s.datasize == 0)) |
| 514 | { |
| 515 | *size = 0; |
| 516 | sockdebug(2, sk, "read 0 bytes", *size); |
| 517 | return(NULL); |
| 518 | } |
| 519 | buf = sk->buf.s.buf; |
| 520 | *size = sk->buf.s.datasize; |
| 521 | sk->buf.s.buf = NULL; |
| 522 | sk->buf.s.bufsize = sk->buf.s.datasize = 0; |
| 523 | sockread(sk); |
| 524 | } |
| 525 | sockdebug(2, sk, "read %zi bytes", *size); |
| 526 | return(buf); |
| 527 | } |
| 528 | |
| 529 | void sockqueue(struct socket *sk, void *data, size_t size) |
| 530 | { |
| 531 | struct dgrambuf *new; |
| 532 | struct sockaddr *remote; |
| 533 | socklen_t remotelen; |
| 534 | |
| 535 | sockdebug(2, sk, "queued %zi bytes", size); |
| 536 | if(size == 0) |
| 537 | return; |
| 538 | if(sk->state == SOCK_STL) |
| 539 | return; |
| 540 | if(sk->dgram) { |
| 541 | if(sockpeeraddr(sk, &remote, &remotelen)) |
| 542 | return; |
| 543 | new = smalloc(sizeof(*new)); |
| 544 | new->next = NULL; |
| 545 | memcpy(new->data = smalloc(size), data, new->size = size); |
| 546 | new->addr = remote; |
| 547 | new->addrlen = remotelen; |
| 548 | if(sk->back->buf.d.l == NULL) |
| 549 | { |
| 550 | sk->back->buf.d.l = sk->back->buf.d.f = new; |
| 551 | } else { |
| 552 | sk->back->buf.d.l->next = new; |
| 553 | sk->back->buf.d.l = new; |
| 554 | } |
| 555 | } else { |
| 556 | sizebuf(&(sk->back->buf.s.buf), &(sk->back->buf.s.bufsize), sk->back->buf.s.datasize + size, 1, 1); |
| 557 | memcpy(sk->back->buf.s.buf + sk->back->buf.s.datasize, data, size); |
| 558 | sk->back->buf.s.datasize += size; |
| 559 | } |
| 560 | linksock(&rbatch, sk->back); |
| 561 | } |
| 562 | |
| 563 | void sockqueuedg(struct socket *sk, struct dgrambuf *dg) |
| 564 | { |
| 565 | if(sk->state == SOCK_STL) { |
| 566 | freedgbuf(dg); |
| 567 | return; |
| 568 | } |
| 569 | if(!sk->dgram) { |
| 570 | flog(LOG_ERR, "BUG: sockqueuedg called on non-dgram socket"); |
| 571 | freedgbuf(dg); |
| 572 | return; |
| 573 | } |
| 574 | dg->next = NULL; |
| 575 | if(sk->back->buf.d.l == NULL) |
| 576 | { |
| 577 | sk->back->buf.d.l = sk->back->buf.d.f = dg; |
| 578 | } else { |
| 579 | sk->back->buf.d.l->next = dg; |
| 580 | sk->back->buf.d.l = dg; |
| 581 | } |
| 582 | linksock(&rbatch, sk->back); |
| 583 | } |
| 584 | |
| 585 | void sockerror(struct socket *sk, int en) |
| 586 | { |
| 587 | sksetstate(sk, SOCK_STL); |
| 588 | if(sk->back->errcb != NULL) |
| 589 | sk->back->errcb(sk->back, en, sk->back->data); |
| 590 | } |
| 591 | |
| 592 | static void recvcmsg(struct ufd *ufd, struct msghdr *msg) |
| 593 | { |
| 594 | struct cmsghdr *cmsg; |
| 595 | |
| 596 | for(cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) |
| 597 | { |
| 598 | #if UNIX_AUTH_STYLE == 1 |
| 599 | if((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SCM_CREDENTIALS)) |
| 600 | { |
| 601 | struct ucred *cred; |
| 602 | if(ufd->d.s.ucred.uid == -1) |
| 603 | { |
| 604 | cred = (struct ucred *)CMSG_DATA(cmsg); |
| 605 | ufd->d.s.ucred.uid = cred->uid; |
| 606 | ufd->d.s.ucred.gid = cred->gid; |
| 607 | } |
| 608 | } |
| 609 | #endif |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | static int ufddgram(struct ufd *ufd) |
| 614 | { |
| 615 | int dgram; |
| 616 | |
| 617 | if(ufd->type == UFD_SOCK) { |
| 618 | dgram = ufd->d.s.type == SOCK_DGRAM; |
| 619 | } else if(ufd->type == UFD_PIPE) { |
| 620 | dgram = 0; |
| 621 | } else { |
| 622 | flog(LOG_ERR, "BUG: calling ufddgram on ufd of bad type %i", ufd->type); |
| 623 | return(-1); |
| 624 | } |
| 625 | if(ufd->sk == NULL) { |
| 626 | flog(LOG_ERR, "BUG: calling ufddgram on socketless ufd (type %i)", ufd->type); |
| 627 | return(-1); |
| 628 | } |
| 629 | if(dgram != ufd->sk->dgram) { |
| 630 | flog(LOG_ERR, "BUG: ufd/socket dgram value mismatch"); |
| 631 | return(-1); |
| 632 | } |
| 633 | return(dgram); |
| 634 | } |
| 635 | |
| 636 | static void sockrecv(struct ufd *ufd) |
| 637 | { |
| 638 | int ret, inq; |
| 639 | int dgram; |
| 640 | struct dgrambuf *dbuf; |
| 641 | struct msghdr msg; |
| 642 | char cbuf[65536]; |
| 643 | struct iovec bufvec; |
| 644 | void *buf; |
| 645 | |
| 646 | memset(&msg, 0, sizeof(msg)); |
| 647 | msg.msg_iov = &bufvec; |
| 648 | msg.msg_iovlen = 1; |
| 649 | msg.msg_control = cbuf; |
| 650 | msg.msg_controllen = sizeof(cbuf); |
| 651 | if((dgram = ufddgram(ufd)) < 0) |
| 652 | return; |
| 653 | if(dgram) { |
| 654 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) |
| 655 | if(ioctl(ufd->fd, SIOCINQ, &inq)) |
| 656 | { |
| 657 | /* I don't really know what could go wrong here, so let's |
| 658 | * assume it's transient. */ |
| 659 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i", strerror(errno), ufd->fd); |
| 660 | return; |
| 661 | } |
| 662 | #else |
| 663 | inq = 65536; |
| 664 | #endif |
| 665 | dbuf = smalloc(sizeof(*dbuf)); |
| 666 | dbuf->data = smalloc(inq); |
| 667 | dbuf->addr = smalloc(dbuf->addrlen = sizeof(struct sockaddr_storage)); |
| 668 | msg.msg_name = dbuf->addr; |
| 669 | msg.msg_namelen = dbuf->addrlen; |
| 670 | bufvec.iov_base = dbuf->data; |
| 671 | bufvec.iov_len = inq; |
| 672 | ret = recvmsg(ufd->fd, &msg, 0); |
| 673 | dbuf->addrlen = msg.msg_namelen; |
| 674 | if(ret < 0) |
| 675 | { |
| 676 | freedgbuf(dbuf); |
| 677 | if((errno == EINTR) || (errno == EAGAIN)) |
| 678 | return; |
| 679 | closeufd(ufd); |
| 680 | sockerror(ufd->sk, errno); |
| 681 | return; |
| 682 | } |
| 683 | if(msg.msg_flags & MSG_CTRUNC) |
| 684 | flog(LOG_DEBUG, "ancillary data was truncated"); |
| 685 | else |
| 686 | recvcmsg(ufd, &msg); |
| 687 | /* On UDP/IPv[46], ret == 0 doesn't mean EOF (since UDP can't |
| 688 | * have EOF), but rather an empty packet. I don't know if any |
| 689 | * other potential DGRAM protocols might have an EOF |
| 690 | * condition, so let's play safe. */ |
| 691 | if(ret == 0) |
| 692 | { |
| 693 | freedgbuf(dbuf); |
| 694 | if((ufd->type != UFD_SOCK) || !((ufd->d.s.family == AF_INET) || (ufd->d.s.family == AF_INET6))) |
| 695 | { |
| 696 | closesock(ufd->sk); |
| 697 | closeufd(ufd); |
| 698 | } |
| 699 | return; |
| 700 | } |
| 701 | dbuf->addr = srealloc(dbuf->addr, dbuf->addrlen); |
| 702 | dbuf->data = srealloc(dbuf->data, dbuf->size = ret); |
| 703 | dbuf->next = NULL; |
| 704 | sockqueuedg(ufd->sk, dbuf); |
| 705 | } else { |
| 706 | #if defined(HAVE_LINUX_SOCKIOS_H) && defined(SIOCINQ) |
| 707 | /* SIOCINQ is Linux-specific AFAIK, but I really have no idea |
| 708 | * how to read the inqueue size on other OSs */ |
| 709 | if(ufd->type == UFD_SOCK) { |
| 710 | if(ioctl(ufd->fd, SIOCINQ, &inq)) |
| 711 | { |
| 712 | /* I don't really know what could go wrong here, so let's |
| 713 | * assume it's transient. */ |
| 714 | flog(LOG_WARNING, "SIOCINQ return %s on socket %i, falling back to 2048 bytes", strerror(errno), ufd->fd); |
| 715 | inq = 2048; |
| 716 | } |
| 717 | } else { |
| 718 | /* There are perils when trying to use SIOCINQ on files >2GiB... */ |
| 719 | inq = 65536; |
| 720 | } |
| 721 | #else |
| 722 | inq = 2048; |
| 723 | #endif |
| 724 | if(inq > 65536) |
| 725 | inq = 65536; |
| 726 | /* This part could be optimized by telling the kernel to read |
| 727 | * directly into ufd->sk->back->buf, but that would be uglier |
| 728 | * by not using the socket function interface. */ |
| 729 | buf = smalloc(inq); |
| 730 | if(ufd->type == UFD_SOCK) |
| 731 | { |
| 732 | bufvec.iov_base = buf; |
| 733 | bufvec.iov_len = inq; |
| 734 | ret = recvmsg(ufd->fd, &msg, 0); |
| 735 | } else { |
| 736 | ret = read(ufd->fd, buf, inq); |
| 737 | msg.msg_controllen = 0; |
| 738 | msg.msg_flags = 0; |
| 739 | } |
| 740 | if(ret < 0) |
| 741 | { |
| 742 | free(buf); |
| 743 | if((errno == EINTR) || (errno == EAGAIN)) |
| 744 | return; |
| 745 | closeufd(ufd); |
| 746 | sockerror(ufd->sk, errno); |
| 747 | return; |
| 748 | } |
| 749 | if(msg.msg_flags & MSG_CTRUNC) |
| 750 | flog(LOG_DEBUG, "ancillary data was truncated"); |
| 751 | else |
| 752 | recvcmsg(ufd, &msg); |
| 753 | if(ret == 0) |
| 754 | { |
| 755 | free(buf); |
| 756 | closeufd(ufd); |
| 757 | closesock(ufd->sk); |
| 758 | return; |
| 759 | } |
| 760 | sockqueue(ufd->sk, buf, ret); |
| 761 | free(buf); |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | static int sockflush(struct ufd *ufd) |
| 766 | { |
| 767 | int ret; |
| 768 | struct dgrambuf *dbuf; |
| 769 | int dgram; |
| 770 | |
| 771 | if((dgram = ufddgram(ufd)) < 0) { |
| 772 | errno = EBADFD; |
| 773 | return(-1); |
| 774 | } |
| 775 | if(dgram) { |
| 776 | dbuf = sockgetdgbuf(ufd->sk); |
| 777 | sendto(ufd->fd, dbuf->data, dbuf->size, MSG_DONTWAIT | MSG_NOSIGNAL, dbuf->addr, dbuf->addrlen); |
| 778 | freedgbuf(dbuf); |
| 779 | } else { |
| 780 | if(ufd->type == UFD_SOCK) |
| 781 | ret = send(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize, MSG_DONTWAIT | MSG_NOSIGNAL); |
| 782 | else |
| 783 | ret = write(ufd->fd, ufd->sk->buf.s.buf, ufd->sk->buf.s.datasize); |
| 784 | if(ret < 0) |
| 785 | return(-1); |
| 786 | if(ret > 0) { |
| 787 | memmove(ufd->sk->buf.s.buf, ((char *)ufd->sk->buf.s.buf) + ret, ufd->sk->buf.s.datasize -= ret); |
| 788 | sockread(ufd->sk); |
| 789 | } |
| 790 | } |
| 791 | return(0); |
| 792 | } |
| 793 | |
| 794 | void closesock(struct socket *sk) |
| 795 | { |
| 796 | sockdebug(1, sk, "closed"); |
| 797 | sksetstate(sk, SOCK_STL); |
| 798 | if(sk->back->eos == 0) |
| 799 | sk->back->eos = 1; |
| 800 | linksock(&rbatch, sk->back); |
| 801 | } |
| 802 | |
| 803 | size_t sockgetdatalen(struct socket *sk) |
| 804 | { |
| 805 | struct dgrambuf *b; |
| 806 | size_t ret; |
| 807 | |
| 808 | if(sk->dgram) { |
| 809 | ret = 0; |
| 810 | for(b = sk->buf.d.f; b != NULL; b = b->next) |
| 811 | ret += b->size; |
| 812 | } else { |
| 813 | ret = sk->buf.s.datasize; |
| 814 | } |
| 815 | return(ret); |
| 816 | } |
| 817 | |
| 818 | /* size_t sockqueuesize(struct socket *sk) */ |
| 819 | /* { */ |
| 820 | /* return(sockgetdatalen(sk->back)); */ |
| 821 | /* } */ |
| 822 | |
| 823 | size_t socktqueuesize(struct socket *sk) |
| 824 | { |
| 825 | size_t ret; |
| 826 | |
| 827 | ret = 0; |
| 828 | while(1) { |
| 829 | ret += sockgetdatalen(sk->back); |
| 830 | if((sk = sk->back->pnext) == NULL) |
| 831 | return(ret); |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | ssize_t sockqueueleft(struct socket *sk) |
| 836 | { |
| 837 | return(sk->back->maxbuf - sockgetdatalen(sk->back)); |
| 838 | } |
| 839 | |
| 840 | /* |
| 841 | * Seriously, I don't know if it's naughty or not to remove |
| 842 | * pre-existing Unix sockets. |
| 843 | */ |
| 844 | static int rebindunix(struct ufd *ufd, struct sockaddr *name, socklen_t namelen) |
| 845 | { |
| 846 | struct sockaddr_un *un; |
| 847 | struct stat sb; |
| 848 | |
| 849 | if((ufd->d.l.family != AF_UNIX) || (name->sa_family != PF_UNIX)) |
| 850 | return(-1); |
| 851 | un = (struct sockaddr_un *)name; |
| 852 | if(stat(un->sun_path, &sb)) |
| 853 | return(-1); |
| 854 | if(!S_ISSOCK(sb.st_mode)) |
| 855 | return(-1); |
| 856 | if(unlink(un->sun_path)) |
| 857 | return(-1); |
| 858 | if(bind(ufd->fd, name, namelen) < 0) |
| 859 | return(-1); |
| 860 | return(0); |
| 861 | } |
| 862 | |
| 863 | void closelport(struct lport *lp) |
| 864 | { |
| 865 | struct ufd *ufd; |
| 866 | struct sockaddr_un *un; |
| 867 | |
| 868 | ufd = lp->ufd; |
| 869 | if((ufd->d.l.family == AF_UNIX) && !getlocalname(ufd->fd, (struct sockaddr **)(void *)&un, NULL) && (un->sun_family == PF_UNIX) && strchr(un->sun_path, '/')) { |
| 870 | if(unlink(un->sun_path)) |
| 871 | flog(LOG_WARNING, "could not unlink Unix socket %s: %s", un->sun_path, strerror(errno)); |
| 872 | } |
| 873 | freeufd(lp->ufd); |
| 874 | } |
| 875 | |
| 876 | /* |
| 877 | * The difference between netcslisten() and netcslistenlocal() is that |
| 878 | * netcslistenlocal() always listens on the local host, instead of |
| 879 | * following proxy/passive mode directions. It is suitable for eg. the |
| 880 | * UI channel, while the file sharing networks should, naturally, use |
| 881 | * netcslisten() instead. |
| 882 | */ |
| 883 | |
| 884 | struct lport *netcslistenlocal(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data) |
| 885 | { |
| 886 | struct lport *lp; |
| 887 | struct ufd *ufd; |
| 888 | int fd; |
| 889 | int intbuf; |
| 890 | |
| 891 | /* I don't know if this is actually correct (it probably isn't), |
| 892 | * but since, at on least Linux systems, PF_* are specifically |
| 893 | * #define'd to their AF_* counterparts, it allows for a severely |
| 894 | * smoother implementation. If it breaks something on your |
| 895 | * platform, please tell me so. |
| 896 | */ |
| 897 | if((fd = socket(name->sa_family, type, 0)) < 0) |
| 898 | return(NULL); |
| 899 | if(confgetint("net", "reuseaddr")) { |
| 900 | intbuf = 1; |
| 901 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &intbuf, sizeof(intbuf)); |
| 902 | } |
| 903 | ufd = mkufd(fd, UFD_LISTEN, NULL); |
| 904 | ufd->d.l.family = name->sa_family; |
| 905 | lp = memset(smalloc(sizeof(*lp)), 0, sizeof(*lp)); |
| 906 | lp->ufd = ufd; |
| 907 | ufd->d.l.lp = lp; |
| 908 | if((bind(fd, name, namelen) < 0) && ((errno != EADDRINUSE) || (rebindunix(ufd, name, namelen) < 0))) { |
| 909 | freeufd(ufd); |
| 910 | return(NULL); |
| 911 | } |
| 912 | if(listen(fd, 16) < 0) |
| 913 | { |
| 914 | freeufd(ufd); |
| 915 | return(NULL); |
| 916 | } |
| 917 | lp->acceptcb = func; |
| 918 | lp->data = data; |
| 919 | return(lp); |
| 920 | } |
| 921 | |
| 922 | struct lport *netcslisten(int type, struct sockaddr *name, socklen_t namelen, void (*func)(struct lport *, struct socket *, void *), void *data) |
| 923 | { |
| 924 | if(confgetint("net", "mode") == 1) |
| 925 | { |
| 926 | errno = EOPNOTSUPP; |
| 927 | return(NULL); |
| 928 | } |
| 929 | if(confgetint("net", "mode") == 0) |
| 930 | return(netcslistenlocal(type, name, namelen, func, data)); |
| 931 | errno = EOPNOTSUPP; |
| 932 | return(NULL); |
| 933 | } |
| 934 | |
| 935 | struct lport *netcstcplisten(int port, int local, void (*func)(struct lport *, struct socket *, void *), void *data) |
| 936 | { |
| 937 | struct sockaddr_in addr; |
| 938 | #ifdef HAVE_IPV6 |
| 939 | struct sockaddr_in6 addr6; |
| 940 | #endif |
| 941 | struct lport *(*csfunc)(int, struct sockaddr *, socklen_t, void (*)(struct lport *, struct socket *, void *), void *); |
| 942 | struct lport *ret; |
| 943 | |
| 944 | if(local) |
| 945 | csfunc = netcslistenlocal; |
| 946 | else |
| 947 | csfunc = netcslisten; |
| 948 | #ifdef HAVE_IPV6 |
| 949 | memset(&addr6, 0, sizeof(addr6)); |
| 950 | addr6.sin6_family = AF_INET6; |
| 951 | addr6.sin6_port = htons(port); |
| 952 | addr6.sin6_addr = in6addr_any; |
| 953 | if((ret = csfunc(SOCK_STREAM, (struct sockaddr *)&addr6, sizeof(addr6), func, data)) != NULL) |
| 954 | return(ret); |
| 955 | if((ret == NULL) && (errno != EAFNOSUPPORT)) |
| 956 | return(NULL); |
| 957 | #endif |
| 958 | memset(&addr, 0, sizeof(addr)); |
| 959 | addr.sin_family = AF_INET; |
| 960 | addr.sin_port = htons(port); |
| 961 | return(csfunc(SOCK_STREAM, (struct sockaddr *)&addr, sizeof(addr), func, data)); |
| 962 | } |
| 963 | |
| 964 | struct socket *netcsdgram(struct sockaddr *name, socklen_t namelen) |
| 965 | { |
| 966 | struct socket *sk; |
| 967 | int mode; |
| 968 | |
| 969 | mode = confgetint("net", "mode"); |
| 970 | if((mode == 0) || (mode == 1)) |
| 971 | { |
| 972 | if((sk = mksock(name->sa_family, SOCK_DGRAM)) == NULL) |
| 973 | return(NULL); |
| 974 | if(bind(sk->ufd->fd, name, namelen) < 0) |
| 975 | { |
| 976 | putsock(sk); |
| 977 | return(NULL); |
| 978 | } |
| 979 | sksetstate(sk, SOCK_EST); |
| 980 | return(sk->back); |
| 981 | } |
| 982 | errno = EOPNOTSUPP; |
| 983 | return(NULL); |
| 984 | } |
| 985 | |
| 986 | struct socket *netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen) |
| 987 | { |
| 988 | struct ufd *nufd; |
| 989 | |
| 990 | nufd = dupufd(sk->back->ufd); |
| 991 | getsock(sk = nufd->sk->back); |
| 992 | memcpy(nufd->d.s.remote = smalloc(addrlen), addr, nufd->d.s.remotelen = addrlen); |
| 993 | nufd->ignread = 1; |
| 994 | return(sk); |
| 995 | } |
| 996 | |
| 997 | struct socket *netcsconn(struct sockaddr *addr, socklen_t addrlen, void (*func)(struct socket *, int, void *), void *data) |
| 998 | { |
| 999 | struct socket *sk; |
| 1000 | int mode; |
| 1001 | |
| 1002 | mode = confgetint("net", "mode"); |
| 1003 | if((mode == 0) || (mode == 1)) |
| 1004 | { |
| 1005 | if((sk = mksock(addr->sa_family, SOCK_STREAM)) == NULL) |
| 1006 | return(NULL); |
| 1007 | memcpy(sk->ufd->d.s.remote = smalloc(addrlen), addr, sk->ufd->d.s.remotelen = addrlen); |
| 1008 | sk->back->conncb = func; |
| 1009 | sk->back->data = data; |
| 1010 | getsock(sk->back); |
| 1011 | putsock(sk); |
| 1012 | if(!connect(sk->ufd->fd, addr, addrlen)) |
| 1013 | { |
| 1014 | sksetstate(sk, SOCK_EST); |
| 1015 | linksock(&cbatch, sk->back); |
| 1016 | return(sk->back); |
| 1017 | } |
| 1018 | if(errno == EINPROGRESS) |
| 1019 | { |
| 1020 | sksetstate(sk, SOCK_SYN); |
| 1021 | return(sk->back); |
| 1022 | } |
| 1023 | putsock(sk); |
| 1024 | return(NULL); |
| 1025 | } |
| 1026 | errno = EOPNOTSUPP; |
| 1027 | return(NULL); |
| 1028 | } |
| 1029 | |
| 1030 | static void acceptunix(struct ufd *ufd) |
| 1031 | { |
| 1032 | int buf; |
| 1033 | |
| 1034 | buf = 1; |
| 1035 | #if UNIX_AUTH_STYLE == 1 |
| 1036 | if(setsockopt(ufd->fd, SOL_SOCKET, SO_PASSCRED, &buf, sizeof(buf)) < 0) |
| 1037 | flog(LOG_WARNING, "could not enable SO_PASSCRED on Unix socket %i: %s", ufd->fd, strerror(errno)); |
| 1038 | #elif UNIX_AUTH_STYLE == 2 |
| 1039 | if(getpeereid(ufd->fd, &ufd->d.s.ucred.uid, &ufd->d.s.ucred.gid) < 0) |
| 1040 | { |
| 1041 | flog(LOG_WARNING, "could not get peer creds on Unix socket %i: %s", ufd->fd, strerror(errno)); |
| 1042 | ufd->d.s.ucred.uid = -1; |
| 1043 | ufd->d.s.ucred.gid = -1; |
| 1044 | } |
| 1045 | #endif |
| 1046 | } |
| 1047 | |
| 1048 | static void runbatches(void) |
| 1049 | { |
| 1050 | struct scons *sc, *nsc; |
| 1051 | |
| 1052 | for(sc = cbatch, cbatch = NULL; sc; sc = nsc) { |
| 1053 | nsc = sc->n; |
| 1054 | if(sc->s->conncb != NULL) |
| 1055 | sc->s->conncb(sc->s, 0, sc->s->data); |
| 1056 | putsock(sc->s); |
| 1057 | free(sc); |
| 1058 | } |
| 1059 | for(sc = rbatch, rbatch = NULL; sc; sc = nsc) { |
| 1060 | nsc = sc->n; |
| 1061 | if(sc->s->readcb != NULL) |
| 1062 | sc->s->readcb(sc->s, sc->s->data); |
| 1063 | if((sockgetdatalen(sc->s) == 0) && (sc->s->eos == 1)) { |
| 1064 | if(sc->s->errcb != NULL) |
| 1065 | sc->s->errcb(sc->s, 0, sc->s->data); |
| 1066 | sc->s->eos = 2; |
| 1067 | } |
| 1068 | putsock(sc->s); |
| 1069 | free(sc); |
| 1070 | } |
| 1071 | for(sc = wbatch, wbatch = NULL; sc; sc = nsc) { |
| 1072 | nsc = sc->n; |
| 1073 | if(sc->s->writecb != NULL) |
| 1074 | sc->s->writecb(sc->s, sc->s->data); |
| 1075 | putsock(sc->s); |
| 1076 | free(sc); |
| 1077 | } |
| 1078 | } |
| 1079 | |
| 1080 | static void cleansocks(void) |
| 1081 | { |
| 1082 | struct ufd *ufd, *next; |
| 1083 | int dead; |
| 1084 | |
| 1085 | for(ufd = ufds; ufd != NULL; ufd = next) { |
| 1086 | next = ufd->next; |
| 1087 | if(ufd->sk) { |
| 1088 | dead = (ufd->fd < 0); |
| 1089 | if(ufd->sk->state == SOCK_STL) |
| 1090 | dead = 1; |
| 1091 | if((ufd->sk->state == SOCK_EST) && (sockgetdatalen(ufd->sk) == 0)) |
| 1092 | dead = 1; |
| 1093 | if(!dead) |
| 1094 | continue; |
| 1095 | if(ufd->sk->eos == 1) { |
| 1096 | ufd->sk->eos = 2; |
| 1097 | closeufd(ufd); |
| 1098 | closesock(ufd->sk); |
| 1099 | } |
| 1100 | if((ufd->sk->refcount == 1) && (ufd->sk->back->refcount == 0)) { |
| 1101 | freeufd(ufd); |
| 1102 | continue; |
| 1103 | } |
| 1104 | } |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | int pollsocks(int timeout) |
| 1109 | { |
| 1110 | int ret; |
| 1111 | socklen_t retlen; |
| 1112 | int newfd, maxfd; |
| 1113 | fd_set rfds, wfds, efds; |
| 1114 | struct ufd *ufd, *nufd; |
| 1115 | struct socket *nsk; |
| 1116 | struct sockaddr_storage ss; |
| 1117 | socklen_t sslen; |
| 1118 | struct timeval tv; |
| 1119 | |
| 1120 | cleansocks(); |
| 1121 | FD_ZERO(&rfds); |
| 1122 | FD_ZERO(&wfds); |
| 1123 | FD_ZERO(&efds); |
| 1124 | for(maxfd = 0, ufd = ufds; ufd != NULL; ufd = ufd->next) { |
| 1125 | if(ufd->fd < 0) |
| 1126 | continue; |
| 1127 | if(!ufd->ignread && ((ufd->sk == NULL) || (sockqueueleft(ufd->sk) > 0))) |
| 1128 | FD_SET(ufd->fd, &rfds); |
| 1129 | if(ufd->sk != NULL) { |
| 1130 | if(sockgetdatalen(ufd->sk) > 0) |
| 1131 | FD_SET(ufd->fd, &wfds); |
| 1132 | else if(ufd->sk->state == SOCK_SYN) |
| 1133 | FD_SET(ufd->fd, &wfds); |
| 1134 | } |
| 1135 | FD_SET(ufd->fd, &efds); |
| 1136 | if(ufd->fd > maxfd) |
| 1137 | maxfd = ufd->fd; |
| 1138 | } |
| 1139 | if(rbatch || wbatch || cbatch) |
| 1140 | timeout = 0; |
| 1141 | tv.tv_sec = timeout / 1000; |
| 1142 | tv.tv_usec = (timeout % 1000) * 1000; |
| 1143 | ret = select(maxfd + 1, &rfds, &wfds, &efds, (timeout < 0)?NULL:&tv); |
| 1144 | if(ret < 0) { |
| 1145 | if(errno != EINTR) { |
| 1146 | flog(LOG_CRIT, "pollsocks: select errored out: %s", strerror(errno)); |
| 1147 | /* To avoid CPU hogging in case it's bad, which it |
| 1148 | * probably is. */ |
| 1149 | sleep(1); |
| 1150 | } |
| 1151 | return(1); |
| 1152 | } |
| 1153 | for(ufd = ufds; ufd != NULL; ufd = ufd->next) { |
| 1154 | if(ufd->sk < 0) |
| 1155 | continue; |
| 1156 | if(ufd->type == UFD_LISTEN) { |
| 1157 | if(FD_ISSET(ufd->fd, &rfds)) { |
| 1158 | sslen = sizeof(ss); |
| 1159 | if((newfd = accept(ufd->fd, (struct sockaddr *)&ss, &sslen)) < 0) { |
| 1160 | if(ufd->d.l.lp->errcb != NULL) |
| 1161 | ufd->d.l.lp->errcb(ufd->d.l.lp, errno, ufd->d.l.lp->data); |
| 1162 | } |
| 1163 | nsk = sockpair(0); |
| 1164 | nufd = mkufd(newfd, UFD_SOCK, nsk); |
| 1165 | nufd->d.s.family = ufd->d.l.family; |
| 1166 | sksetstate(nsk, SOCK_EST); |
| 1167 | memcpy(nufd->d.s.remote = smalloc(sslen), &ss, sslen); |
| 1168 | nufd->d.s.remotelen = sslen; |
| 1169 | if(ss.ss_family == PF_UNIX) |
| 1170 | acceptunix(nufd); |
| 1171 | if(ufd->d.l.lp->acceptcb != NULL) |
| 1172 | ufd->d.l.lp->acceptcb(ufd->d.l.lp, nsk->back, ufd->d.l.lp->data); |
| 1173 | putsock(nsk); |
| 1174 | } |
| 1175 | if(FD_ISSET(ufd->fd, &efds)) { |
| 1176 | retlen = sizeof(ret); |
| 1177 | getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 1178 | if(ufd->d.l.lp->errcb != NULL) |
| 1179 | ufd->d.l.lp->errcb(ufd->d.l.lp, ret, ufd->d.l.lp->data); |
| 1180 | continue; |
| 1181 | } |
| 1182 | } else { |
| 1183 | if(ufd->sk->state == SOCK_SYN) { |
| 1184 | if(FD_ISSET(ufd->fd, &efds)) { |
| 1185 | retlen = sizeof(ret); |
| 1186 | getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 1187 | if(ufd->sk->back->conncb != NULL) |
| 1188 | ufd->sk->back->conncb(ufd->sk->back, ret, ufd->sk->back->data); |
| 1189 | closeufd(ufd); |
| 1190 | continue; |
| 1191 | } |
| 1192 | if(FD_ISSET(ufd->fd, &rfds) || FD_ISSET(ufd->fd, &wfds)) { |
| 1193 | sksetstate(ufd->sk, SOCK_EST); |
| 1194 | linksock(&cbatch, ufd->sk->back); |
| 1195 | } |
| 1196 | } else if(ufd->sk->state == SOCK_EST) { |
| 1197 | if(FD_ISSET(ufd->fd, &efds)) { |
| 1198 | retlen = sizeof(ret); |
| 1199 | getsockopt(ufd->fd, SOL_SOCKET, SO_ERROR, &ret, &retlen); |
| 1200 | sockerror(ufd->sk, ret); |
| 1201 | closeufd(ufd); |
| 1202 | continue; |
| 1203 | } |
| 1204 | if(FD_ISSET(ufd->fd, &rfds)) |
| 1205 | sockrecv(ufd); |
| 1206 | if(ufd->fd == -1) |
| 1207 | continue; |
| 1208 | if(FD_ISSET(ufd->fd, &wfds)) { |
| 1209 | if(sockflush(ufd)) { |
| 1210 | sockerror(ufd->sk, errno); |
| 1211 | closeufd(ufd); |
| 1212 | continue; |
| 1213 | } |
| 1214 | } |
| 1215 | } |
| 1216 | } |
| 1217 | } |
| 1218 | runbatches(); |
| 1219 | cleansocks(); |
| 1220 | return(1); |
| 1221 | } |
| 1222 | |
| 1223 | static struct ufd *getskufd(struct socket *sk) |
| 1224 | { |
| 1225 | while(1) { |
| 1226 | if(sk->back->ufd != NULL) |
| 1227 | return(sk->back->ufd); |
| 1228 | if((sk = sk->back->pnext) == NULL) |
| 1229 | break; |
| 1230 | } |
| 1231 | return(NULL); |
| 1232 | } |
| 1233 | |
| 1234 | int socksettos(struct socket *sk, int tos) |
| 1235 | { |
| 1236 | int buf; |
| 1237 | struct ufd *ufd; |
| 1238 | int dscp2tos; |
| 1239 | |
| 1240 | ufd = getskufd(sk); |
| 1241 | if(ufd->type != UFD_SOCK) { |
| 1242 | errno = EOPNOTSUPP; |
| 1243 | return(-1); |
| 1244 | } |
| 1245 | if(ufd->d.s.family == AF_UNIX) |
| 1246 | return(0); /* Unix sockets are always perfect. :) */ |
| 1247 | if(ufd->d.s.family == AF_INET) |
| 1248 | { |
| 1249 | dscp2tos = confgetint("net", "dscp-tos"); |
| 1250 | switch(tos) |
| 1251 | { |
| 1252 | case 0: |
| 1253 | buf = 0; |
| 1254 | break; |
| 1255 | case SOCK_TOS_MINCOST: |
| 1256 | if(dscp2tos) |
| 1257 | buf = confgetint("net", "diffserv-mincost") << 2; |
| 1258 | else |
| 1259 | buf = 0x02; |
| 1260 | break; |
| 1261 | case SOCK_TOS_MAXREL: |
| 1262 | if(dscp2tos) |
| 1263 | buf = confgetint("net", "diffserv-maxrel") << 2; |
| 1264 | else |
| 1265 | buf = 0x04; |
| 1266 | break; |
| 1267 | case SOCK_TOS_MAXTP: |
| 1268 | if(dscp2tos) |
| 1269 | buf = confgetint("net", "diffserv-maxtp") << 2; |
| 1270 | else |
| 1271 | buf = 0x08; |
| 1272 | break; |
| 1273 | case SOCK_TOS_MINDELAY: |
| 1274 | if(dscp2tos) |
| 1275 | buf = confgetint("net", "diffserv-mindelay") << 2; |
| 1276 | else |
| 1277 | buf = 0x10; |
| 1278 | break; |
| 1279 | default: |
| 1280 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); |
| 1281 | return(-1); |
| 1282 | } |
| 1283 | if(setsockopt(ufd->fd, IPPROTO_IP, IP_TOS, &buf, sizeof(buf)) < 0) |
| 1284 | { |
| 1285 | flog(LOG_WARNING, "could not set sock TOS to %i: %s", tos, strerror(errno)); |
| 1286 | return(-1); |
| 1287 | } |
| 1288 | return(0); |
| 1289 | } |
| 1290 | if(ufd->d.s.family == AF_INET6) |
| 1291 | { |
| 1292 | switch(tos) |
| 1293 | { |
| 1294 | case 0: |
| 1295 | buf = 0; |
| 1296 | case SOCK_TOS_MINCOST: |
| 1297 | buf = confgetint("net", "diffserv-mincost"); |
| 1298 | break; |
| 1299 | case SOCK_TOS_MAXREL: |
| 1300 | buf = confgetint("net", "diffserv-maxrel"); |
| 1301 | break; |
| 1302 | case SOCK_TOS_MAXTP: |
| 1303 | buf = confgetint("net", "diffserv-maxtp"); |
| 1304 | break; |
| 1305 | case SOCK_TOS_MINDELAY: |
| 1306 | buf = confgetint("net", "diffserv-mindelay"); |
| 1307 | break; |
| 1308 | default: |
| 1309 | flog(LOG_WARNING, "attempted to set unknown TOS value %i to IPv4 sock", tos); |
| 1310 | return(-1); |
| 1311 | } |
| 1312 | /* |
| 1313 | On Linux, the API IPv6 flow label management doesn't seem to |
| 1314 | be entirely complete, so I guess this will have to wait. |
| 1315 | |
| 1316 | if(setsockopt(...) < 0) |
| 1317 | { |
| 1318 | flog(LOG_WARNING, "could not set sock traffic class to %i: %s", tos, strerror(errno)); |
| 1319 | return(-1); |
| 1320 | } |
| 1321 | */ |
| 1322 | return(0); |
| 1323 | } |
| 1324 | flog(LOG_WARNING, "could not set TOS on sock of family %i", ufd->d.s.family); |
| 1325 | return(1); |
| 1326 | } |
| 1327 | |
| 1328 | struct resolvedata |
| 1329 | { |
| 1330 | int fd; |
| 1331 | void (*callback)(struct sockaddr *addr, int addrlen, void *data); |
| 1332 | void *data; |
| 1333 | struct sockaddr_storage addr; |
| 1334 | int addrlen; |
| 1335 | }; |
| 1336 | |
| 1337 | static void resolvecb(pid_t pid, int status, struct resolvedata *data) |
| 1338 | { |
| 1339 | static char buf[80]; |
| 1340 | int ret; |
| 1341 | struct sockaddr_in *ipv4; |
| 1342 | |
| 1343 | if(!status) |
| 1344 | { |
| 1345 | if((ret = read(data->fd, buf, sizeof(buf))) != 4) |
| 1346 | { |
| 1347 | errno = ENOENT; |
| 1348 | data->callback(NULL, 0, data->data); |
| 1349 | } else { |
| 1350 | ipv4 = (struct sockaddr_in *)&data->addr; |
| 1351 | memcpy(&ipv4->sin_addr, buf, 4); |
| 1352 | data->callback((struct sockaddr *)ipv4, sizeof(*ipv4), data->data); |
| 1353 | } |
| 1354 | } else { |
| 1355 | errno = ENOENT; |
| 1356 | data->callback(NULL, 0, data->data); |
| 1357 | } |
| 1358 | close(data->fd); |
| 1359 | free(data); |
| 1360 | } |
| 1361 | |
| 1362 | int netresolve(char *addr, void (*callback)(struct sockaddr *addr, int addrlen, void *data), void *data) |
| 1363 | { |
| 1364 | int i; |
| 1365 | char *p; |
| 1366 | int port; |
| 1367 | int pfd[2]; |
| 1368 | pid_t child; |
| 1369 | struct resolvedata *rdata; |
| 1370 | struct sockaddr_in ipv4; |
| 1371 | struct hostent *he; |
| 1372 | sigset_t sigset; |
| 1373 | |
| 1374 | /* IPv4 */ |
| 1375 | port = -1; |
| 1376 | if((p = strchr(addr, ':')) != NULL) |
| 1377 | { |
| 1378 | *p = 0; |
| 1379 | port = atoi(p + 1); |
| 1380 | } |
| 1381 | ipv4.sin_family = AF_INET; |
| 1382 | ipv4.sin_port = htons(port); |
| 1383 | if(inet_aton(addr, &ipv4.sin_addr)) |
| 1384 | { |
| 1385 | callback((struct sockaddr *)&ipv4, sizeof(ipv4), data); |
| 1386 | } else { |
| 1387 | sigemptyset(&sigset); |
| 1388 | sigaddset(&sigset, SIGCHLD); |
| 1389 | sigprocmask(SIG_BLOCK, &sigset, NULL); |
| 1390 | if((pipe(pfd) < 0) || ((child = fork()) < 0)) |
| 1391 | { |
| 1392 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 1393 | return(-1); |
| 1394 | } |
| 1395 | if(child == 0) |
| 1396 | { |
| 1397 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 1398 | for(i = 3; i < FD_SETSIZE; i++) |
| 1399 | { |
| 1400 | if(i != pfd[1]) |
| 1401 | close(i); |
| 1402 | } |
| 1403 | signal(SIGALRM, SIG_DFL); |
| 1404 | alarm(30); |
| 1405 | if((he = gethostbyname(addr)) == NULL) |
| 1406 | exit(1); |
| 1407 | write(pfd[1], he->h_addr_list[0], 4); |
| 1408 | exit(0); |
| 1409 | } else { |
| 1410 | close(pfd[1]); |
| 1411 | fcntl(pfd[0], F_SETFL, fcntl(pfd[0], F_GETFL) | O_NONBLOCK); |
| 1412 | rdata = smalloc(sizeof(*rdata)); |
| 1413 | rdata->fd = pfd[0]; |
| 1414 | rdata->callback = callback; |
| 1415 | rdata->data = data; |
| 1416 | memcpy(&rdata->addr, &ipv4, rdata->addrlen = sizeof(ipv4)); |
| 1417 | childcallback(child, (void (*)(pid_t, int, void *))resolvecb, rdata); |
| 1418 | sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
| 1419 | return(1); |
| 1420 | } |
| 1421 | } |
| 1422 | return(0); |
| 1423 | } |
| 1424 | |
| 1425 | static int getlocalname(int fd, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1426 | { |
| 1427 | socklen_t len; |
| 1428 | struct sockaddr_storage name; |
| 1429 | |
| 1430 | *namebuf = NULL; |
| 1431 | if(fd < 0) |
| 1432 | return(-1); |
| 1433 | len = sizeof(name); |
| 1434 | if(getsockname(fd, (struct sockaddr *)&name, &len) < 0) |
| 1435 | { |
| 1436 | flog(LOG_ERR, "BUG: alive socket with dead fd in sockgetlocalname (%s)", strerror(errno)); |
| 1437 | return(-1); |
| 1438 | } |
| 1439 | *namebuf = memcpy(smalloc(len), &name, len); |
| 1440 | if(lenbuf != NULL) |
| 1441 | *lenbuf = len; |
| 1442 | return(0); |
| 1443 | } |
| 1444 | |
| 1445 | int lstgetlocalname(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1446 | { |
| 1447 | struct ufd *ufd; |
| 1448 | |
| 1449 | ufd = lp->ufd; |
| 1450 | return(getlocalname(ufd->fd, namebuf, lenbuf)); |
| 1451 | } |
| 1452 | |
| 1453 | int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1454 | { |
| 1455 | struct ufd *ufd; |
| 1456 | |
| 1457 | ufd = getskufd(sk); |
| 1458 | if(ufd->type != UFD_SOCK) { |
| 1459 | errno = EOPNOTSUPP; |
| 1460 | return(-1); |
| 1461 | } |
| 1462 | return(getlocalname(ufd->fd, namebuf, lenbuf)); |
| 1463 | } |
| 1464 | |
| 1465 | static void sethostaddr(struct sockaddr *dst, struct sockaddr *src) |
| 1466 | { |
| 1467 | if(dst->sa_family != src->sa_family) |
| 1468 | { |
| 1469 | flog(LOG_ERR, "BUG: non-matching socket families in sethostaddr (%i -> %i)", src->sa_family, dst->sa_family); |
| 1470 | return; |
| 1471 | } |
| 1472 | switch(src->sa_family) |
| 1473 | { |
| 1474 | case AF_INET: |
| 1475 | ((struct sockaddr_in *)dst)->sin_addr = ((struct sockaddr_in *)src)->sin_addr; |
| 1476 | break; |
| 1477 | case AF_INET6: |
| 1478 | ((struct sockaddr_in6 *)dst)->sin6_addr = ((struct sockaddr_in6 *)src)->sin6_addr; |
| 1479 | break; |
| 1480 | default: |
| 1481 | flog(LOG_WARNING, "sethostaddr unimplemented for family %i", src->sa_family); |
| 1482 | break; |
| 1483 | } |
| 1484 | } |
| 1485 | |
| 1486 | static int makepublic(struct sockaddr *addr) |
| 1487 | { |
| 1488 | int ret; |
| 1489 | socklen_t plen; |
| 1490 | struct sockaddr *pname; |
| 1491 | |
| 1492 | if((ret = getpublicaddr(addr->sa_family, &pname, &plen)) < 0) |
| 1493 | { |
| 1494 | flog(LOG_ERR, "could not get public address: %s", strerror(errno)); |
| 1495 | return(-1); |
| 1496 | } |
| 1497 | if(ret) |
| 1498 | return(0); |
| 1499 | sethostaddr(addr, pname); |
| 1500 | free(pname); |
| 1501 | return(0); |
| 1502 | } |
| 1503 | |
| 1504 | static int getremotename(int fd, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1505 | { |
| 1506 | socklen_t len; |
| 1507 | struct sockaddr *name; |
| 1508 | |
| 1509 | switch(confgetint("net", "mode")) { |
| 1510 | case 0: |
| 1511 | *namebuf = NULL; |
| 1512 | if(!getlocalname(fd, &name, &len)) { |
| 1513 | *namebuf = name; |
| 1514 | *lenbuf = len; |
| 1515 | makepublic(name); |
| 1516 | return(0); |
| 1517 | } |
| 1518 | flog(LOG_ERR, "could not get remotely accessible name by any means"); |
| 1519 | return(-1); |
| 1520 | case 1: |
| 1521 | errno = EOPNOTSUPP; |
| 1522 | return(-1); |
| 1523 | default: |
| 1524 | flog(LOG_CRIT, "unknown net mode %i active", confgetint("net", "mode")); |
| 1525 | errno = EOPNOTSUPP; |
| 1526 | return(-1); |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1531 | { |
| 1532 | struct ufd *ufd; |
| 1533 | |
| 1534 | ufd = getskufd(sk); |
| 1535 | if(ufd->type != UFD_SOCK) { |
| 1536 | errno = EOPNOTSUPP; |
| 1537 | return(-1); |
| 1538 | } |
| 1539 | if(ufd->fd < 0) { |
| 1540 | errno = EBADF; |
| 1541 | return(-1); |
| 1542 | } |
| 1543 | return(getremotename(ufd->fd, namebuf, lenbuf)); |
| 1544 | } |
| 1545 | |
| 1546 | int lstgetremotename(struct lport *lp, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1547 | { |
| 1548 | struct ufd *ufd; |
| 1549 | |
| 1550 | ufd = lp->ufd; |
| 1551 | return(getremotename(ufd->fd, namebuf, lenbuf)); |
| 1552 | } |
| 1553 | |
| 1554 | int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1555 | { |
| 1556 | struct sockaddr *name1, *name2; |
| 1557 | socklen_t len1, len2; |
| 1558 | struct ufd *ufd1, *ufd2; |
| 1559 | |
| 1560 | ufd1 = getskufd(sk); |
| 1561 | ufd2 = getskufd(sk2); |
| 1562 | if((ufd1->type != UFD_SOCK) || (ufd2->type != UFD_SOCK)) { |
| 1563 | errno = EOPNOTSUPP; |
| 1564 | return(-1); |
| 1565 | } |
| 1566 | if(ufd1->d.s.family != ufd2->d.s.family) |
| 1567 | { |
| 1568 | flog(LOG_ERR, "using sockgetremotename2 with sockets of differing family: %i %i", ufd1->d.s.family, ufd2->d.s.family); |
| 1569 | return(-1); |
| 1570 | } |
| 1571 | if(getremotename(ufd1->fd, &name1, &len1)) |
| 1572 | return(-1); |
| 1573 | if(getremotename(ufd2->fd, &name2, &len2)) { |
| 1574 | free(name1); |
| 1575 | return(-1); |
| 1576 | } |
| 1577 | sethostaddr(name1, name2); |
| 1578 | free(name2); |
| 1579 | *namebuf = name1; |
| 1580 | *lenbuf = len1; |
| 1581 | return(0); |
| 1582 | } |
| 1583 | |
| 1584 | int lstgetremotename2(struct lport *lp, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1585 | { |
| 1586 | struct sockaddr *name1, *name2; |
| 1587 | socklen_t len1, len2; |
| 1588 | struct ufd *ufd1, *ufd2; |
| 1589 | |
| 1590 | ufd1 = lp->ufd; |
| 1591 | ufd2 = getskufd(sk2); |
| 1592 | if(ufd2->type != UFD_SOCK) { |
| 1593 | errno = EOPNOTSUPP; |
| 1594 | return(-1); |
| 1595 | } |
| 1596 | if(ufd1->d.l.family != ufd2->d.s.family) |
| 1597 | { |
| 1598 | flog(LOG_ERR, "using lstgetremotename2 with sockets of differing family: %i %i", ufd1->d.l.family, ufd2->d.s.family); |
| 1599 | return(-1); |
| 1600 | } |
| 1601 | if(getremotename(ufd1->fd, &name1, &len1)) |
| 1602 | return(-1); |
| 1603 | if(getremotename(ufd2->fd, &name2, &len2)) { |
| 1604 | free(name1); |
| 1605 | return(-1); |
| 1606 | } |
| 1607 | sethostaddr(name1, name2); |
| 1608 | free(name2); |
| 1609 | *namebuf = name1; |
| 1610 | *lenbuf = len1; |
| 1611 | return(0); |
| 1612 | } |
| 1613 | |
| 1614 | int getucred(struct socket *sk, uid_t *uid, gid_t *gid) |
| 1615 | { |
| 1616 | struct ufd *ufd; |
| 1617 | |
| 1618 | ufd = getskufd(sk); |
| 1619 | if(ufd->type != UFD_SOCK) { |
| 1620 | errno = EOPNOTSUPP; |
| 1621 | return(-1); |
| 1622 | } |
| 1623 | if(ufd->d.s.family != AF_UNIX) { |
| 1624 | errno = EOPNOTSUPP; |
| 1625 | return(-1); |
| 1626 | } |
| 1627 | *uid = ufd->d.s.ucred.uid; |
| 1628 | *gid = ufd->d.s.ucred.gid; |
| 1629 | return(0); |
| 1630 | } |
| 1631 | |
| 1632 | /* void sockblock(struct socket *sk, int block) */ |
| 1633 | /* { */ |
| 1634 | /* struct ufd *ufd; */ |
| 1635 | |
| 1636 | /* ufd = getskufd(sk); */ |
| 1637 | /* ufd->ignread = block; */ |
| 1638 | /* } */ |
| 1639 | |
| 1640 | int sockfamily(struct socket *sk) |
| 1641 | { |
| 1642 | struct ufd *ufd; |
| 1643 | |
| 1644 | ufd = getskufd(sk); |
| 1645 | if(ufd->type != UFD_SOCK) { |
| 1646 | errno = EOPNOTSUPP; |
| 1647 | return(-1); |
| 1648 | } |
| 1649 | return(ufd->d.s.family); |
| 1650 | } |
| 1651 | |
| 1652 | int sockpeeraddr(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf) |
| 1653 | { |
| 1654 | struct ufd *ufd; |
| 1655 | |
| 1656 | ufd = getskufd(sk); |
| 1657 | if(ufd->type != UFD_SOCK) { |
| 1658 | errno = EOPNOTSUPP; |
| 1659 | return(-1); |
| 1660 | } |
| 1661 | if(ufd->d.s.remote == NULL) |
| 1662 | return(-1); |
| 1663 | *namebuf = memcpy(smalloc(ufd->d.s.remotelen), ufd->d.s.remote, ufd->d.s.remotelen); |
| 1664 | if(lenbuf != NULL) |
| 1665 | *lenbuf = ufd->d.s.remotelen; |
| 1666 | return(0); |
| 1667 | } |
| 1668 | |
| 1669 | char *formatsockpeer(struct socket *sk) |
| 1670 | { |
| 1671 | struct sockaddr *name; |
| 1672 | socklen_t nlen; |
| 1673 | char *ret; |
| 1674 | |
| 1675 | if(sockpeeraddr(sk, &name, &nlen)) |
| 1676 | return(NULL); |
| 1677 | ret = formataddress(name, nlen); |
| 1678 | free(name); |
| 1679 | return(ret); |
| 1680 | } |
| 1681 | |
| 1682 | int addreq(struct sockaddr *x, struct sockaddr *y) |
| 1683 | { |
| 1684 | struct sockaddr_un *u1, *u2; |
| 1685 | struct sockaddr_in *n1, *n2; |
| 1686 | #ifdef HAVE_IPV6 |
| 1687 | struct sockaddr_in6 *s1, *s2; |
| 1688 | #endif |
| 1689 | |
| 1690 | if(x->sa_family != y->sa_family) |
| 1691 | return(0); |
| 1692 | switch(x->sa_family) { |
| 1693 | case AF_UNIX: |
| 1694 | u1 = (struct sockaddr_un *)x; u2 = (struct sockaddr_un *)y; |
| 1695 | if(strncmp(u1->sun_path, u2->sun_path, sizeof(u1->sun_path))) |
| 1696 | return(0); |
| 1697 | break; |
| 1698 | case AF_INET: |
| 1699 | n1 = (struct sockaddr_in *)x; n2 = (struct sockaddr_in *)y; |
| 1700 | if(n1->sin_port != n2->sin_port) |
| 1701 | return(0); |
| 1702 | if(n1->sin_addr.s_addr != n2->sin_addr.s_addr) |
| 1703 | return(0); |
| 1704 | break; |
| 1705 | #ifdef HAVE_IPV6 |
| 1706 | case AF_INET6: |
| 1707 | s1 = (struct sockaddr_in6 *)x; s2 = (struct sockaddr_in6 *)y; |
| 1708 | if(s1->sin6_port != s2->sin6_port) |
| 1709 | return(0); |
| 1710 | if(memcmp(s1->sin6_addr.s6_addr, s2->sin6_addr.s6_addr, sizeof(s1->sin6_addr.s6_addr))) |
| 1711 | return(0); |
| 1712 | break; |
| 1713 | #endif |
| 1714 | } |
| 1715 | return(1); |
| 1716 | } |
| 1717 | |
| 1718 | char *formataddress(struct sockaddr *arg, socklen_t arglen) |
| 1719 | { |
| 1720 | struct sockaddr_in *ipv4; |
| 1721 | #ifdef HAVE_IPV6 |
| 1722 | struct sockaddr_in6 *ipv6; |
| 1723 | #endif |
| 1724 | static char *ret = NULL; |
| 1725 | char buf[1024]; |
| 1726 | |
| 1727 | if(ret != NULL) |
| 1728 | free(ret); |
| 1729 | ret = NULL; |
| 1730 | switch(arg->sa_family) |
| 1731 | { |
| 1732 | case AF_UNIX: |
| 1733 | ret = sstrdup("Unix socket"); |
| 1734 | break; |
| 1735 | case AF_INET: |
| 1736 | ipv4 = (struct sockaddr_in *)arg; |
| 1737 | if(inet_ntop(AF_INET, &ipv4->sin_addr, buf, sizeof(buf)) == NULL) |
| 1738 | return(NULL); |
| 1739 | ret = sprintf2("%s:%i", buf, (int)ntohs(ipv4->sin_port)); |
| 1740 | break; |
| 1741 | #ifdef HAVE_IPV6 |
| 1742 | case AF_INET6: |
| 1743 | ipv6 = (struct sockaddr_in6 *)arg; |
| 1744 | if(inet_ntop(AF_INET6, &ipv6->sin6_addr, buf, sizeof(buf)) == NULL) |
| 1745 | return(NULL); |
| 1746 | ret = sprintf2("[%s]:%i", buf, (int)ntohs(ipv6->sin6_port)); |
| 1747 | break; |
| 1748 | #endif |
| 1749 | default: |
| 1750 | errno = EPFNOSUPPORT; |
| 1751 | break; |
| 1752 | } |
| 1753 | return(ret); |
| 1754 | } |
| 1755 | |
| 1756 | #if 0 |
| 1757 | |
| 1758 | /* |
| 1759 | * It was very nice to use this, but it seems |
| 1760 | * to mess things up, so I guess it has to go... :-( |
| 1761 | */ |
| 1762 | |
| 1763 | static int formataddress(FILE *stream, const struct printf_info *info, const void *const *args) |
| 1764 | { |
| 1765 | struct sockaddr *arg; |
| 1766 | socklen_t arglen; |
| 1767 | struct sockaddr_un *UNIX; /* Some wise guy has #defined unix with |
| 1768 | * lowercase letters to 1, so I do this |
| 1769 | * instead. */ |
| 1770 | struct sockaddr_in *ipv4; |
| 1771 | int ret; |
| 1772 | |
| 1773 | arg = *(struct sockaddr **)(args[0]); |
| 1774 | arglen = *(socklen_t *)(args[1]); |
| 1775 | switch(arg->sa_family) |
| 1776 | { |
| 1777 | case AF_UNIX: |
| 1778 | UNIX = (struct sockaddr_un *)arg; |
| 1779 | ret = fprintf(stream, "%s", UNIX->sun_path); |
| 1780 | break; |
| 1781 | case AF_INET: |
| 1782 | ipv4 = (struct sockaddr_in *)arg; |
| 1783 | ret = fprintf(stream, "%s:%i", inet_ntoa(ipv4->sin_addr), (int)ntohs(ipv4->sin_port)); |
| 1784 | break; |
| 1785 | default: |
| 1786 | ret = -1; |
| 1787 | errno = EPFNOSUPPORT; |
| 1788 | break; |
| 1789 | } |
| 1790 | return(ret); |
| 1791 | } |
| 1792 | |
| 1793 | static int formataddress_arginfo(const struct printf_info *info, size_t n, int *argtypes) |
| 1794 | { |
| 1795 | if(n > 0) |
| 1796 | argtypes[0] = PA_POINTER; |
| 1797 | if(n > 1) |
| 1798 | argtypes[1] = PA_INT; /* Sources tell me that socklen_t _must_ |
| 1799 | * be an int, so I guess this should be |
| 1800 | * safe. */ |
| 1801 | return(2); |
| 1802 | } |
| 1803 | #endif |
| 1804 | |
| 1805 | static int init(int hup) |
| 1806 | { |
| 1807 | if(!hup) |
| 1808 | { |
| 1809 | /* |
| 1810 | if(register_printf_function('N', formataddress, formataddress_arginfo)) |
| 1811 | { |
| 1812 | flog(LOG_CRIT, "could not register printf handler %%N: %s", strerror(errno)); |
| 1813 | return(1); |
| 1814 | } |
| 1815 | */ |
| 1816 | } |
| 1817 | return(0); |
| 1818 | } |
| 1819 | |
| 1820 | static void terminate(void) |
| 1821 | { |
| 1822 | /* |
| 1823 | while(ufds != NULL) |
| 1824 | freeufd(ufds); |
| 1825 | */ |
| 1826 | } |
| 1827 | |
| 1828 | static struct module me = |
| 1829 | { |
| 1830 | .name = "net", |
| 1831 | .conf = |
| 1832 | { |
| 1833 | .vars = myvars |
| 1834 | }, |
| 1835 | .init = init, |
| 1836 | .terminate = terminate |
| 1837 | }; |
| 1838 | |
| 1839 | MODULE(me) |