San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com> |
| 3 | All rights reserved. |
| 4 | |
| 5 | This file is part of x11vnc. |
| 6 | |
| 7 | x11vnc is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or (at |
| 10 | your option) any later version. |
| 11 | |
| 12 | x11vnc is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with x11vnc; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA |
| 20 | or see <http://www.gnu.org/licenses/>. |
| 21 | |
| 22 | In addition, as a special exception, Karl J. Runge |
| 23 | gives permission to link the code of its release of x11vnc with the |
| 24 | OpenSSL project's "OpenSSL" library (or with modified versions of it |
| 25 | that use the same license as the "OpenSSL" library), and distribute |
| 26 | the linked executables. You must obey the GNU General Public License |
| 27 | in all respects for all of the code used other than "OpenSSL". If you |
| 28 | modify this file, you may extend this exception to your version of the |
| 29 | file, but you are not obligated to do so. If you do not wish to do |
| 30 | so, delete this exception statement from your version. |
| 31 | */ |
| 32 | |
| 33 | /* -- inet.c -- */ |
| 34 | |
| 35 | #include "x11vnc.h" |
| 36 | #include "unixpw.h" |
| 37 | #include "sslhelper.h" |
| 38 | |
| 39 | /* |
| 40 | * Simple utility to map host name to dotted IP address. Ignores aliases. |
| 41 | * Up to caller to free returned string. |
| 42 | */ |
| 43 | char *host2ip(char *host); |
| 44 | char *raw2host(char *raw, int len); |
| 45 | char *raw2ip(char *raw); |
| 46 | char *ip2host(char *ip); |
| 47 | int ipv6_ip(char *host); |
| 48 | int dotted_ip(char *host, int partial); |
| 49 | int get_remote_port(int sock); |
| 50 | int get_local_port(int sock); |
| 51 | char *get_remote_host(int sock); |
| 52 | char *get_local_host(int sock); |
| 53 | char *ident_username(rfbClientPtr client); |
| 54 | int find_free_port(int start, int end); |
| 55 | int find_free_port6(int start, int end); |
| 56 | int have_ssh_env(void); |
| 57 | char *ipv6_getnameinfo(struct sockaddr *paddr, int addrlen); |
| 58 | char *ipv6_getipaddr(struct sockaddr *paddr, int addrlen); |
| 59 | int listen6(int port); |
| 60 | int listen_unix(char *file); |
| 61 | int accept_unix(int s); |
| 62 | int connect_tcp(char *host, int port); |
| 63 | int listen_tcp(int port, in_addr_t iface, int try6); |
| 64 | |
| 65 | static int get_port(int sock, int remote); |
| 66 | static char *get_host(int sock, int remote); |
| 67 | |
| 68 | char *host2ip(char *host) { |
| 69 | struct hostent *hp; |
| 70 | struct sockaddr_in addr; |
| 71 | char *str; |
| 72 | |
| 73 | if (! host_lookup) { |
| 74 | return NULL; |
| 75 | } |
| 76 | |
| 77 | hp = gethostbyname(host); |
| 78 | if (!hp) { |
| 79 | return NULL; |
| 80 | } |
| 81 | memset(&addr, 0, sizeof(addr)); |
| 82 | addr.sin_family = AF_INET; |
| 83 | addr.sin_addr.s_addr = *(unsigned long *)hp->h_addr; |
| 84 | str = strdup(inet_ntoa(addr.sin_addr)); |
| 85 | return str; |
| 86 | } |
| 87 | |
| 88 | char *raw2host(char *raw, int len) { |
| 89 | char *str; |
| 90 | #if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H |
| 91 | struct hostent *hp; |
| 92 | |
| 93 | if (! host_lookup) { |
| 94 | return strdup("unknown"); |
| 95 | } |
| 96 | |
| 97 | hp = gethostbyaddr(raw, len, AF_INET); |
| 98 | if (!hp) { |
| 99 | return strdup(inet_ntoa(*((struct in_addr *)raw))); |
| 100 | } |
| 101 | str = strdup(hp->h_name); |
| 102 | #else |
| 103 | str = strdup("unknown"); |
| 104 | #endif |
| 105 | return str; |
| 106 | } |
| 107 | |
| 108 | char *raw2ip(char *raw) { |
| 109 | return strdup(inet_ntoa(*((struct in_addr *)raw))); |
| 110 | } |
| 111 | |
| 112 | char *ip2host(char *ip) { |
| 113 | char *str; |
| 114 | #if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H |
| 115 | struct hostent *hp; |
| 116 | in_addr_t iaddr; |
| 117 | |
| 118 | if (! host_lookup) { |
| 119 | return strdup("unknown"); |
| 120 | } |
| 121 | |
| 122 | iaddr = inet_addr(ip); |
| 123 | if (iaddr == htonl(INADDR_NONE)) { |
| 124 | return strdup("unknown"); |
| 125 | } |
| 126 | |
| 127 | hp = gethostbyaddr((char *)&iaddr, sizeof(in_addr_t), AF_INET); |
| 128 | if (!hp) { |
| 129 | return strdup("unknown"); |
| 130 | } |
| 131 | str = strdup(hp->h_name); |
| 132 | #else |
| 133 | str = strdup("unknown"); |
| 134 | #endif |
| 135 | return str; |
| 136 | } |
| 137 | |
| 138 | int ipv6_ip(char *host_in) { |
| 139 | char *p, *host, a[2]; |
| 140 | int ncol = 0, nhex = 0; |
| 141 | |
| 142 | if (host_in[0] == '[') { |
| 143 | host = host_in + 1; |
| 144 | } else { |
| 145 | host = host_in; |
| 146 | } |
| 147 | |
| 148 | if (strstr(host, "::ffff:") == host || strstr(host, "::FFFF:") == host) { |
| 149 | return dotted_ip(host + strlen("::ffff:"), 0); |
| 150 | } |
| 151 | |
| 152 | a[1] = '\0'; |
| 153 | |
| 154 | p = host; |
| 155 | while (*p != '\0' && *p != '%' && *p != ']') { |
| 156 | if (*p == ':') { |
| 157 | ncol++; |
| 158 | } else { |
| 159 | nhex++; |
| 160 | } |
| 161 | a[0] = *p; |
| 162 | if (strpbrk(a, ":abcdef0123456789") == a) { |
| 163 | p++; |
| 164 | continue; |
| 165 | } |
| 166 | return 0; |
| 167 | } |
| 168 | if (ncol < 2 || ncol > 8 || nhex == 0) { |
| 169 | return 0; |
| 170 | } else { |
| 171 | return 1; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | int dotted_ip(char *host, int partial) { |
| 176 | int len, dots = 0; |
| 177 | char *p = host; |
| 178 | |
| 179 | if (!host) { |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | if (!isdigit((unsigned char) host[0])) { |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | len = strlen(host); |
| 188 | if (!partial && !isdigit((unsigned char) host[len-1])) { |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | while (*p != '\0') { |
| 193 | if (*p == '.') dots++; |
| 194 | if (*p == '.' || isdigit((unsigned char) (*p))) { |
| 195 | p++; |
| 196 | continue; |
| 197 | } |
| 198 | return 0; |
| 199 | } |
| 200 | if (!partial && dots != 3) { |
| 201 | return 0; |
| 202 | } |
| 203 | return 1; |
| 204 | } |
| 205 | |
| 206 | static int get_port(int sock, int remote) { |
| 207 | struct sockaddr_in saddr; |
| 208 | unsigned int saddr_len; |
| 209 | int saddr_port; |
| 210 | |
| 211 | saddr_len = sizeof(saddr); |
| 212 | memset(&saddr, 0, sizeof(saddr)); |
| 213 | saddr_port = -1; |
| 214 | if (remote) { |
| 215 | if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| 216 | saddr_port = ntohs(saddr.sin_port); |
| 217 | } |
| 218 | } else { |
| 219 | if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| 220 | saddr_port = ntohs(saddr.sin_port); |
| 221 | } |
| 222 | } |
| 223 | return saddr_port; |
| 224 | } |
| 225 | |
| 226 | int get_remote_port(int sock) { |
| 227 | return get_port(sock, 1); |
| 228 | } |
| 229 | |
| 230 | int get_local_port(int sock) { |
| 231 | return get_port(sock, 0); |
| 232 | } |
| 233 | |
| 234 | static char *get_host(int sock, int remote) { |
| 235 | struct sockaddr_in saddr; |
| 236 | unsigned int saddr_len; |
| 237 | int saddr_port; |
| 238 | char *saddr_ip_str = NULL; |
| 239 | |
| 240 | saddr_len = sizeof(saddr); |
| 241 | memset(&saddr, 0, sizeof(saddr)); |
| 242 | saddr_port = -1; |
| 243 | #if LIBVNCSERVER_HAVE_NETINET_IN_H |
| 244 | if (remote) { |
| 245 | if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| 246 | saddr_ip_str = inet_ntoa(saddr.sin_addr); |
| 247 | } |
| 248 | } else { |
| 249 | if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| 250 | saddr_ip_str = inet_ntoa(saddr.sin_addr); |
| 251 | } |
| 252 | } |
| 253 | #endif |
| 254 | if (! saddr_ip_str) { |
| 255 | saddr_ip_str = "unknown"; |
| 256 | } |
| 257 | return strdup(saddr_ip_str); |
| 258 | } |
| 259 | |
| 260 | char *get_remote_host(int sock) { |
| 261 | return get_host(sock, 1); |
| 262 | } |
| 263 | |
| 264 | char *get_local_host(int sock) { |
| 265 | return get_host(sock, 0); |
| 266 | } |
| 267 | |
| 268 | char *ident_username(rfbClientPtr client) { |
| 269 | ClientData *cd = (ClientData *) client->clientData; |
| 270 | char *str, *newhost, *user = NULL, *newuser = NULL; |
| 271 | int len; |
| 272 | |
| 273 | if (cd) { |
| 274 | user = cd->username; |
| 275 | } |
| 276 | if (!user || *user == '\0') { |
| 277 | int n, sock, ok = 0; |
| 278 | int block = 0; |
| 279 | int refused = 0; |
| 280 | |
| 281 | /* |
| 282 | * need to check to see if the operation will block for |
| 283 | * a long time: a firewall may just ignore our packets. |
| 284 | */ |
| 285 | #if LIBVNCSERVER_HAVE_FORK |
| 286 | { pid_t pid, pidw; |
| 287 | int rc; |
| 288 | if ((pid = fork()) > 0) { |
| 289 | usleep(100 * 1000); /* 0.1 sec for quick success or refusal */ |
| 290 | pidw = waitpid(pid, &rc, WNOHANG); |
| 291 | if (pidw <= 0) { |
| 292 | usleep(1500 * 1000); /* 1.5 sec */ |
| 293 | pidw = waitpid(pid, &rc, WNOHANG); |
| 294 | if (pidw <= 0) { |
| 295 | int rc2; |
| 296 | rfbLog("ident_username: set block=1 (hung)\n"); |
| 297 | block = 1; |
| 298 | kill(pid, SIGTERM); |
| 299 | usleep(100 * 1000); |
| 300 | waitpid(pid, &rc2, WNOHANG); |
| 301 | } |
| 302 | } |
| 303 | if (pidw > 0 && !block) { |
| 304 | if (WIFEXITED(rc) && WEXITSTATUS(rc) == 1) { |
| 305 | rfbLog("ident_username: set refused=1 (exit)\n"); |
| 306 | refused = 1; |
| 307 | } |
| 308 | } |
| 309 | } else if (pid == -1) { |
| 310 | ; |
| 311 | } else { |
| 312 | /* child */ |
| 313 | signal(SIGHUP, SIG_DFL); |
| 314 | signal(SIGINT, SIG_DFL); |
| 315 | signal(SIGQUIT, SIG_DFL); |
| 316 | signal(SIGTERM, SIG_DFL); |
| 317 | |
| 318 | if ((sock = connect_tcp(client->host, 113)) < 0) { |
| 319 | exit(1); |
| 320 | } else { |
| 321 | close(sock); |
| 322 | exit(0); |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | #endif |
| 327 | if (block || refused) { |
| 328 | ; |
| 329 | } else if ((sock = connect_tcp(client->host, 113)) < 0) { |
| 330 | rfbLog("ident_username: could not connect to ident: %s:%d\n", |
| 331 | client->host, 113); |
| 332 | } else { |
| 333 | char msg[128]; |
| 334 | int ret; |
| 335 | fd_set rfds; |
| 336 | struct timeval tv; |
| 337 | int rport = get_remote_port(client->sock); |
| 338 | int lport = get_local_port(client->sock); |
| 339 | |
| 340 | sprintf(msg, "%d, %d\r\n", rport, lport); |
| 341 | n = write(sock, msg, strlen(msg)); |
| 342 | |
| 343 | FD_ZERO(&rfds); |
| 344 | FD_SET(sock, &rfds); |
| 345 | tv.tv_sec = 3; |
| 346 | tv.tv_usec = 0; |
| 347 | ret = select(sock+1, &rfds, NULL, NULL, &tv); |
| 348 | |
| 349 | if (ret > 0) { |
| 350 | int i; |
| 351 | char *q, *p; |
| 352 | for (i=0; i < (int) sizeof(msg); i++) { |
| 353 | msg[i] = '\0'; |
| 354 | } |
| 355 | usleep(250*1000); |
| 356 | n = read(sock, msg, 127); |
| 357 | close(sock); |
| 358 | if (n <= 0) goto badreply; |
| 359 | |
| 360 | /* 32782 , 6000 : USERID : UNIX :runge */ |
| 361 | q = strstr(msg, "USERID"); |
| 362 | if (!q) goto badreply; |
| 363 | q = strstr(q, ":"); |
| 364 | if (!q) goto badreply; |
| 365 | q++; |
| 366 | q = strstr(q, ":"); |
| 367 | if (!q) goto badreply; |
| 368 | q++; |
| 369 | q = lblanks(q); |
| 370 | p = q; |
| 371 | while (*p) { |
| 372 | if (*p == '\r' || *p == '\n') { |
| 373 | *p = '\0'; |
| 374 | } |
| 375 | p++; |
| 376 | } |
| 377 | ok = 1; |
| 378 | if (strlen(q) > 24) { |
| 379 | *(q+24) = '\0'; |
| 380 | } |
| 381 | newuser = strdup(q); |
| 382 | |
| 383 | badreply: |
| 384 | n = 0; /* avoid syntax error */ |
| 385 | } else { |
| 386 | close(sock); |
| 387 | } |
| 388 | } |
| 389 | if (! ok || !newuser) { |
| 390 | newuser = strdup("unknown-user"); |
| 391 | } |
| 392 | if (cd) { |
| 393 | if (cd->username) { |
| 394 | free(cd->username); |
| 395 | } |
| 396 | cd->username = newuser; |
| 397 | } |
| 398 | user = newuser; |
| 399 | } |
| 400 | if (!strcmp(user, "unknown-user") && cd && cd->unixname[0] != '\0') { |
| 401 | user = cd->unixname; |
| 402 | } |
| 403 | if (unixpw && openssl_last_ip && strstr("UNIX:", user) != user) { |
| 404 | newhost = ip2host(openssl_last_ip); |
| 405 | } else { |
| 406 | newhost = ip2host(client->host); |
| 407 | } |
| 408 | len = strlen(user) + 1 + strlen(newhost) + 1; |
| 409 | str = (char *) malloc(len); |
| 410 | sprintf(str, "%s@%s", user, newhost); |
| 411 | free(newhost); |
| 412 | return str; |
| 413 | } |
| 414 | |
| 415 | int find_free_port(int start, int end) { |
| 416 | int port; |
| 417 | if (start <= 0) { |
| 418 | start = 1024; |
| 419 | } |
| 420 | if (end <= 0) { |
| 421 | end = 65530; |
| 422 | } |
| 423 | for (port = start; port <= end; port++) { |
| 424 | int sock = listen_tcp(port, htonl(INADDR_ANY), 0); |
| 425 | if (sock >= 0) { |
| 426 | close(sock); |
| 427 | return port; |
| 428 | } |
| 429 | } |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | int find_free_port6(int start, int end) { |
| 434 | int port; |
| 435 | if (start <= 0) { |
| 436 | start = 1024; |
| 437 | } |
| 438 | if (end <= 0) { |
| 439 | end = 65530; |
| 440 | } |
| 441 | for (port = start; port <= end; port++) { |
| 442 | int sock = listen6(port); |
| 443 | if (sock >= 0) { |
| 444 | close(sock); |
| 445 | return port; |
| 446 | } |
| 447 | } |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | int have_ssh_env(void) { |
| 452 | char *str, *p = getenv("SSH_CONNECTION"); |
| 453 | char *rhost, *rport, *lhost, *lport; |
| 454 | |
| 455 | if (! p) { |
| 456 | char *q = getenv("SSH_CLIENT"); |
| 457 | if (! q) { |
| 458 | return 0; |
| 459 | } |
| 460 | if (strstr(q, "127.0.0.1") != NULL) { |
| 461 | return 0; |
| 462 | } |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | if (strstr(p, "127.0.0.1") != NULL) { |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | str = strdup(p); |
| 471 | |
| 472 | p = strtok(str, " "); |
| 473 | rhost = p; |
| 474 | |
| 475 | p = strtok(NULL, " "); |
| 476 | if (! p) goto fail; |
| 477 | |
| 478 | rport = p; |
| 479 | |
| 480 | p = strtok(NULL, " "); |
| 481 | if (! p) goto fail; |
| 482 | |
| 483 | lhost = p; |
| 484 | |
| 485 | p = strtok(NULL, " "); |
| 486 | if (! p) goto fail; |
| 487 | |
| 488 | lport = p; |
| 489 | |
| 490 | if (0) fprintf(stderr, "%d/%d - '%s' '%s'\n", atoi(rport), atoi(lport), rhost, lhost); |
| 491 | |
| 492 | if (atoi(rport) <= 16 || atoi(rport) > 65535) { |
| 493 | goto fail; |
| 494 | } |
| 495 | if (atoi(lport) <= 16 || atoi(lport) > 65535) { |
| 496 | goto fail; |
| 497 | } |
| 498 | |
| 499 | if (!strcmp(rhost, lhost)) { |
| 500 | goto fail; |
| 501 | } |
| 502 | |
| 503 | free(str); |
| 504 | |
| 505 | return 1; |
| 506 | |
| 507 | fail: |
| 508 | |
| 509 | free(str); |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | char *ipv6_getnameinfo(struct sockaddr *paddr, int addrlen) { |
| 515 | #if X11VNC_IPV6 |
| 516 | char name[200]; |
| 517 | if (noipv6) { |
| 518 | return strdup("unknown"); |
| 519 | } |
| 520 | if (getnameinfo(paddr, addrlen, name, sizeof(name), NULL, 0, 0) == 0) { |
| 521 | return strdup(name); |
| 522 | } |
| 523 | #endif |
| 524 | return strdup("unknown"); |
| 525 | } |
| 526 | |
| 527 | char *ipv6_getipaddr(struct sockaddr *paddr, int addrlen) { |
| 528 | #if X11VNC_IPV6 && defined(NI_NUMERICHOST) |
| 529 | char name[200]; |
| 530 | if (noipv6) { |
| 531 | return strdup("unknown"); |
| 532 | } |
| 533 | if (getnameinfo(paddr, addrlen, name, sizeof(name), NULL, 0, NI_NUMERICHOST) == 0) { |
| 534 | return strdup(name); |
| 535 | } |
| 536 | #endif |
| 537 | return strdup("unknown"); |
| 538 | } |
| 539 | |
| 540 | int listen6(int port) { |
| 541 | #if X11VNC_IPV6 |
| 542 | struct sockaddr_in6 sin; |
| 543 | int fd = -1, one = 1; |
| 544 | |
| 545 | if (noipv6) { |
| 546 | return -1; |
| 547 | } |
| 548 | if (port <= 0 || 65535 < port) { |
| 549 | /* for us, invalid port means do not listen. */ |
| 550 | return -1; |
| 551 | } |
| 552 | |
| 553 | fd = socket(AF_INET6, SOCK_STREAM, 0); |
| 554 | if (fd < 0) { |
| 555 | rfbLogPerror("listen6: socket"); |
| 556 | rfbLog("(Ignore the above error if this system is IPv4-only.)\n"); |
| 557 | return -1; |
| 558 | } |
| 559 | |
| 560 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)) < 0) { |
| 561 | rfbLogPerror("listen6: setsockopt SO_REUSEADDR"); |
| 562 | close(fd); |
| 563 | return -1; |
| 564 | } |
| 565 | |
| 566 | #if defined(SOL_IPV6) && defined(IPV6_V6ONLY) |
| 567 | if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, (char *)&one, sizeof(one)) < 0) { |
| 568 | rfbLogPerror("listen6: setsockopt IPV6_V6ONLY"); |
| 569 | close(fd); |
| 570 | return -1; |
| 571 | } |
| 572 | #endif |
| 573 | |
| 574 | memset((char *)&sin, 0, sizeof(sin)); |
| 575 | sin.sin6_family = AF_INET6; |
| 576 | sin.sin6_port = htons(port); |
| 577 | sin.sin6_addr = in6addr_any; |
| 578 | |
| 579 | if (listen_str6) { |
| 580 | if (!strcmp(listen_str6, "localhost") || !strcmp(listen_str6, "::1")) { |
| 581 | sin.sin6_addr = in6addr_loopback; |
| 582 | } else { |
| 583 | int err; |
| 584 | struct addrinfo *ai; |
| 585 | struct addrinfo hints; |
| 586 | char service[32]; |
| 587 | |
| 588 | memset(&hints, 0, sizeof(hints)); |
| 589 | sprintf(service, "%d", port); |
| 590 | |
| 591 | hints.ai_family = AF_INET6; |
| 592 | hints.ai_socktype = SOCK_STREAM; |
| 593 | #ifdef AI_ADDRCONFIG |
| 594 | hints.ai_flags |= AI_ADDRCONFIG; |
| 595 | #endif |
| 596 | #ifdef AI_NUMERICHOST |
| 597 | if(ipv6_ip(listen_str6)) { |
| 598 | hints.ai_flags |= AI_NUMERICHOST; |
| 599 | } |
| 600 | #endif |
| 601 | #ifdef AI_NUMERICSERV |
| 602 | hints.ai_flags |= AI_NUMERICSERV; |
| 603 | #endif |
| 604 | err = getaddrinfo(listen_str6, service, &hints, &ai); |
| 605 | if (err == 0) { |
| 606 | struct addrinfo *ap = ai; |
| 607 | err = 1; |
| 608 | while (ap != NULL) { |
| 609 | char *s = ipv6_getipaddr(ap->ai_addr, ap->ai_addrlen); |
| 610 | if (!s) s = strdup("unknown"); |
| 611 | |
| 612 | rfbLog("listen6: checking: %s family: %d\n", s, ap->ai_family); |
| 613 | if (ap->ai_family == AF_INET6) { |
| 614 | memcpy((char *)&sin, ap->ai_addr, sizeof(sin)); |
| 615 | rfbLog("listen6: using: %s scope_id: %d\n", s, sin.sin6_scope_id); |
| 616 | err = 0; |
| 617 | free(s); |
| 618 | break; |
| 619 | } |
| 620 | free(s); |
| 621 | ap = ap->ai_next; |
| 622 | } |
| 623 | freeaddrinfo(ai); |
| 624 | } |
| 625 | |
| 626 | if (err != 0) { |
| 627 | rfbLog("Invalid or Unsupported -listen6 string: %s\n", listen_str6); |
| 628 | close(fd); |
| 629 | return -1; |
| 630 | } |
| 631 | } |
| 632 | } else if (allow_list && !strcmp(allow_list, "127.0.0.1")) { |
| 633 | sin.sin6_addr = in6addr_loopback; |
| 634 | } else if (listen_str) { |
| 635 | if (!strcmp(listen_str, "localhost")) { |
| 636 | sin.sin6_addr = in6addr_loopback; |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0) { |
| 641 | rfbLogPerror("listen6: bind"); |
| 642 | close(fd); |
| 643 | return -1; |
| 644 | } |
| 645 | if (listen(fd, 32) < 0) { |
| 646 | rfbLogPerror("listen6: listen"); |
| 647 | close(fd); |
| 648 | return -1; |
| 649 | } |
| 650 | return fd; |
| 651 | #else |
| 652 | if (port) {} |
| 653 | return -1; |
| 654 | #endif |
| 655 | } |
| 656 | |
| 657 | #ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H |
| 658 | #include <sys/un.h> |
| 659 | #endif |
| 660 | |
| 661 | int listen_unix(char *file) { |
| 662 | #if !defined(AF_UNIX) || !defined(LIBVNCSERVER_HAVE_SYS_SOCKET_H) |
| 663 | if (sock) {} |
| 664 | return -1; |
| 665 | #else |
| 666 | int s, len; |
| 667 | struct sockaddr_un saun; |
| 668 | |
| 669 | s = socket(AF_UNIX, SOCK_STREAM, 0); |
| 670 | if (s < 0) { |
| 671 | rfbLogPerror("listen_unix: socket"); |
| 672 | return -1; |
| 673 | } |
| 674 | saun.sun_family = AF_UNIX; |
| 675 | strcpy(saun.sun_path, file); |
| 676 | unlink(file); |
| 677 | |
| 678 | len = sizeof(saun.sun_family) + strlen(saun.sun_path); |
| 679 | |
| 680 | if (bind(s, (struct sockaddr *)&saun, len) < 0) { |
| 681 | rfbLogPerror("listen_unix: bind"); |
| 682 | close(s); |
| 683 | return -1; |
| 684 | } |
| 685 | |
| 686 | if (listen(s, 32) < 0) { |
| 687 | rfbLogPerror("listen_unix: listen"); |
| 688 | close(s); |
| 689 | return -1; |
| 690 | } |
| 691 | rfbLog("listening on unix socket: %s fd=%d\n", file, s); |
| 692 | return s; |
| 693 | #endif |
| 694 | } |
| 695 | |
| 696 | int accept_unix(int s) { |
| 697 | #if !defined(AF_UNIX) || !defined(LIBVNCSERVER_HAVE_SYS_SOCKET_H) |
| 698 | if (s) {} |
| 699 | return -1; |
| 700 | #else |
| 701 | int fd, fromlen; |
| 702 | struct sockaddr_un fsaun; |
| 703 | |
| 704 | fd = accept(s, (struct sockaddr *)&fsaun, &fromlen); |
| 705 | if (fd < 0) { |
| 706 | rfbLogPerror("accept_unix: accept"); |
| 707 | return -1; |
| 708 | } |
| 709 | return fd; |
| 710 | #endif |
| 711 | } |
| 712 | |
| 713 | int connect_tcp(char *host, int port) { |
| 714 | double t0 = dnow(); |
| 715 | int fd = -1; |
| 716 | int fail4 = noipv4; |
| 717 | if (getenv("IPV4_FAILS")) { |
| 718 | fail4 = 2; |
| 719 | } |
| 720 | |
| 721 | rfbLog("connect_tcp: trying: %s %d\n", host, port); |
| 722 | |
| 723 | if (fail4) { |
| 724 | if (fail4 > 1) { |
| 725 | rfbLog("TESTING: IPV4_FAILS for connect_tcp.\n"); |
| 726 | } |
| 727 | } else { |
| 728 | fd = rfbConnectToTcpAddr(host, port); |
| 729 | } |
| 730 | |
| 731 | if (fd >= 0) { |
| 732 | return fd; |
| 733 | } |
| 734 | rfbLogPerror("connect_tcp: connection failed"); |
| 735 | |
| 736 | if (dnow() - t0 < 4.0) { |
| 737 | rfbLog("connect_tcp: re-trying %s %d\n", host, port); |
| 738 | usleep (100 * 1000); |
| 739 | if (!fail4) { |
| 740 | fd = rfbConnectToTcpAddr(host, port); |
| 741 | } |
| 742 | if (fd < 0) { |
| 743 | rfbLogPerror("connect_tcp: connection failed"); |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | if (fd < 0 && !noipv6) { |
| 748 | #if X11VNC_IPV6 |
| 749 | int err; |
| 750 | struct addrinfo *ai; |
| 751 | struct addrinfo hints; |
| 752 | char service[32], *host2, *q; |
| 753 | |
| 754 | rfbLog("connect_tcp: trying IPv6 %s %d\n", host, port); |
| 755 | |
| 756 | memset(&hints, 0, sizeof(hints)); |
| 757 | sprintf(service, "%d", port); |
| 758 | |
| 759 | hints.ai_family = AF_UNSPEC; |
| 760 | hints.ai_socktype = SOCK_STREAM; |
| 761 | #ifdef AI_ADDRCONFIG |
| 762 | hints.ai_flags |= AI_ADDRCONFIG; |
| 763 | #endif |
| 764 | if(ipv6_ip(host)) { |
| 765 | #ifdef AI_NUMERICHOST |
| 766 | rfbLog("connect_tcp[ipv6]: setting AI_NUMERICHOST for %s\n", host); |
| 767 | hints.ai_flags |= AI_NUMERICHOST; |
| 768 | #endif |
| 769 | } |
| 770 | #ifdef AI_NUMERICSERV |
| 771 | hints.ai_flags |= AI_NUMERICSERV; |
| 772 | #endif |
| 773 | |
| 774 | if (!strcmp(host, "127.0.0.1")) { |
| 775 | host2 = strdup("::1"); |
| 776 | } else if (host[0] == '[') { |
| 777 | host2 = strdup(host+1); |
| 778 | } else { |
| 779 | host2 = strdup(host); |
| 780 | } |
| 781 | q = strrchr(host2, ']'); |
| 782 | if (q) { |
| 783 | *q = '\0'; |
| 784 | } |
| 785 | |
| 786 | err = getaddrinfo(host2, service, &hints, &ai); |
| 787 | if (err != 0) { |
| 788 | rfbLog("connect_tcp[ipv6]: getaddrinfo[%d]: %s\n", err, gai_strerror(err)); |
| 789 | usleep(100 * 1000); |
| 790 | err = getaddrinfo(host2, service, &hints, &ai); |
| 791 | } |
| 792 | free(host2); |
| 793 | |
| 794 | if (err != 0) { |
| 795 | rfbLog("connect_tcp[ipv6]: getaddrinfo[%d]: %s\n", err, gai_strerror(err)); |
| 796 | } else { |
| 797 | struct addrinfo *ap = ai; |
| 798 | while (ap != NULL) { |
| 799 | int sock; |
| 800 | |
| 801 | if (fail4) { |
| 802 | struct sockaddr_in6 *s6ptr; |
| 803 | if (ap->ai_family != AF_INET6) { |
| 804 | rfbLog("connect_tcp[ipv6]: skipping AF_INET address under -noipv4\n"); |
| 805 | ap = ap->ai_next; |
| 806 | continue; |
| 807 | } |
| 808 | #ifdef IN6_IS_ADDR_V4MAPPED |
| 809 | s6ptr = (struct sockaddr_in6 *) ap->ai_addr; |
| 810 | if (IN6_IS_ADDR_V4MAPPED(&(s6ptr->sin6_addr))) { |
| 811 | rfbLog("connect_tcp[ipv6]: skipping V4MAPPED address under -noipv4\n"); |
| 812 | ap = ap->ai_next; |
| 813 | continue; |
| 814 | } |
| 815 | #endif |
| 816 | } |
| 817 | |
| 818 | sock = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol); |
| 819 | |
| 820 | if (sock == -1) { |
| 821 | rfbLogPerror("connect_tcp[ipv6]: socket"); |
| 822 | if (0) rfbLog("(Ignore the above error if this system is IPv4-only.)\n"); |
| 823 | } else { |
| 824 | int res = -1, dmsg = 0; |
| 825 | char *s = ipv6_getipaddr(ap->ai_addr, ap->ai_addrlen); |
| 826 | if (!s) s = strdup("unknown"); |
| 827 | |
| 828 | rfbLog("connect_tcp[ipv6]: trying sock=%d fam=%d proto=%d using %s\n", |
| 829 | sock, ap->ai_family, ap->ai_protocol, s); |
| 830 | res = connect(sock, ap->ai_addr, ap->ai_addrlen); |
| 831 | #if defined(SOL_IPV6) && defined(IPV6_V6ONLY) |
| 832 | if (res != 0) { |
| 833 | int zero = 0; |
| 834 | rfbLogPerror("connect_tcp[ipv6]: connect"); |
| 835 | dmsg = 1; |
| 836 | if (setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, (char *)&zero, sizeof(zero)) == 0) { |
| 837 | rfbLog("connect_tcp[ipv6]: trying again with IPV6_V6ONLY=0\n"); |
| 838 | res = connect(sock, ap->ai_addr, ap->ai_addrlen); |
| 839 | dmsg = 0; |
| 840 | } else { |
| 841 | rfbLogPerror("connect_tcp[ipv6]: setsockopt IPV6_V6ONLY"); |
| 842 | } |
| 843 | } |
| 844 | #endif |
| 845 | if (res == 0) { |
| 846 | rfbLog("connect_tcp[ipv6]: connect OK\n"); |
| 847 | fd = sock; |
| 848 | if (!ipv6_client_ip_str) { |
| 849 | ipv6_client_ip_str = strdup(s); |
| 850 | } |
| 851 | free(s); |
| 852 | break; |
| 853 | } else { |
| 854 | if (!dmsg) rfbLogPerror("connect_tcp[ipv6]: connect"); |
| 855 | close(sock); |
| 856 | } |
| 857 | free(s); |
| 858 | } |
| 859 | ap = ap->ai_next; |
| 860 | } |
| 861 | freeaddrinfo(ai); |
| 862 | } |
| 863 | #endif |
| 864 | } |
| 865 | if (fd < 0 && !fail4) { |
| 866 | /* this is a kludge for IPv4-only machines getting v4mapped string. */ |
| 867 | char *q, *host2; |
| 868 | if (host[0] == '[') { |
| 869 | host2 = strdup(host+1); |
| 870 | } else { |
| 871 | host2 = strdup(host); |
| 872 | } |
| 873 | q = strrchr(host2, ']'); |
| 874 | if (q) { |
| 875 | *q = '\0'; |
| 876 | } |
| 877 | if (strstr(host2, "::ffff:") == host2 || strstr(host2, "::FFFF:") == host2) { |
| 878 | char *host3 = host2 + strlen("::ffff:"); |
| 879 | if (dotted_ip(host3, 0)) { |
| 880 | rfbLog("connect_tcp[ipv4]: trying fallback to IPv4 for %s\n", host2); |
| 881 | fd = rfbConnectToTcpAddr(host3, port); |
| 882 | if (fd < 0) { |
| 883 | rfbLogPerror("connect_tcp[ipv4]: connection failed"); |
| 884 | } |
| 885 | } |
| 886 | } |
| 887 | free(host2); |
| 888 | } |
| 889 | return fd; |
| 890 | } |
| 891 | |
| 892 | int listen_tcp(int port, in_addr_t iface, int try6) { |
| 893 | int fd = -1; |
| 894 | int fail4 = noipv4; |
| 895 | if (getenv("IPV4_FAILS")) { |
| 896 | fail4 = 2; |
| 897 | } |
| 898 | |
| 899 | if (port <= 0 || 65535 < port) { |
| 900 | /* for us, invalid port means do not listen. */ |
| 901 | return -1; |
| 902 | } |
| 903 | |
| 904 | if (fail4) { |
| 905 | if (fail4 > 1) { |
| 906 | rfbLog("TESTING: IPV4_FAILS for listen_tcp: port=%d try6=%d\n", port, try6); |
| 907 | } |
| 908 | } else { |
| 909 | fd = rfbListenOnTCPPort(port, iface); |
| 910 | } |
| 911 | |
| 912 | if (fd >= 0) { |
| 913 | return fd; |
| 914 | } |
| 915 | if (fail4 > 1) { |
| 916 | rfbLogPerror("listen_tcp: listen failed"); |
| 917 | } |
| 918 | |
| 919 | if (fd < 0 && try6 && ipv6_listen && !noipv6) { |
| 920 | #if X11VNC_IPV6 |
| 921 | char *save = listen_str6; |
| 922 | if (iface == htonl(INADDR_LOOPBACK)) { |
| 923 | listen_str6 = "localhost"; |
| 924 | rfbLog("listen_tcp: retrying on IPv6 in6addr_loopback ...\n"); |
| 925 | fd = listen6(port); |
| 926 | } else if (iface == htonl(INADDR_ANY)) { |
| 927 | listen_str6 = NULL; |
| 928 | rfbLog("listen_tcp: retrying on IPv6 in6addr_any ...\n"); |
| 929 | fd = listen6(port); |
| 930 | } |
| 931 | listen_str6 = save; |
| 932 | #endif |
| 933 | } |
| 934 | return fd; |
| 935 | } |
| 936 | |