| 1 | /* |
| 2 | * Unix networking abstraction. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <assert.h> |
| 8 | #include <errno.h> |
| 9 | #include <fcntl.h> |
| 10 | #include <unistd.h> |
| 11 | #include <sys/types.h> |
| 12 | #include <sys/socket.h> |
| 13 | #include <sys/ioctl.h> |
| 14 | #include <arpa/inet.h> |
| 15 | #include <netinet/in.h> |
| 16 | #include <netinet/tcp.h> |
| 17 | #include <netdb.h> |
| 18 | #include <sys/un.h> |
| 19 | |
| 20 | #define DEFINE_PLUG_METHOD_MACROS |
| 21 | #include "putty.h" |
| 22 | #include "network.h" |
| 23 | #include "tree234.h" |
| 24 | |
| 25 | /* Solaris needs <sys/sockio.h> for SIOCATMARK. */ |
| 26 | #ifndef SIOCATMARK |
| 27 | #include <sys/sockio.h> |
| 28 | #endif |
| 29 | |
| 30 | #ifndef X11_UNIX_PATH |
| 31 | # define X11_UNIX_PATH "/tmp/.X11-unix/X" |
| 32 | #endif |
| 33 | |
| 34 | struct Socket_tag { |
| 35 | struct socket_function_table *fn; |
| 36 | /* the above variable absolutely *must* be the first in this structure */ |
| 37 | const char *error; |
| 38 | int s; |
| 39 | Plug plug; |
| 40 | void *private_ptr; |
| 41 | bufchain output_data; |
| 42 | int connected; /* irrelevant for listening sockets */ |
| 43 | int writable; |
| 44 | int frozen; /* this causes readability notifications to be ignored */ |
| 45 | int frozen_readable; /* this means we missed at least one readability |
| 46 | * notification while we were frozen */ |
| 47 | int localhost_only; /* for listening sockets */ |
| 48 | char oobdata[1]; |
| 49 | int sending_oob; |
| 50 | int oobpending; /* is there OOB data available to read? */ |
| 51 | int oobinline; |
| 52 | int pending_error; /* in case send() returns error */ |
| 53 | int listener; |
| 54 | int nodelay, keepalive; /* for connect()-type sockets */ |
| 55 | int privport, port; /* and again */ |
| 56 | SockAddr addr; |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * We used to typedef struct Socket_tag *Socket. |
| 61 | * |
| 62 | * Since we have made the networking abstraction slightly more |
| 63 | * abstract, Socket no longer means a tcp socket (it could mean |
| 64 | * an ssl socket). So now we must use Actual_Socket when we know |
| 65 | * we are talking about a tcp socket. |
| 66 | */ |
| 67 | typedef struct Socket_tag *Actual_Socket; |
| 68 | |
| 69 | struct SockAddr_tag { |
| 70 | const char *error; |
| 71 | /* |
| 72 | * Which address family this address belongs to. AF_INET for |
| 73 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
| 74 | * resolution has not been done and a simple host name is held |
| 75 | * in this SockAddr structure. |
| 76 | */ |
| 77 | int family; |
| 78 | #ifndef NO_IPV6 |
| 79 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
| 80 | struct addrinfo *ai; /* steps along the linked list */ |
| 81 | #else |
| 82 | unsigned long *addresses; /* Addresses IPv4 style. */ |
| 83 | int naddresses, curraddr; |
| 84 | #endif |
| 85 | char hostname[512]; /* Store an unresolved host name. */ |
| 86 | }; |
| 87 | |
| 88 | static tree234 *sktree; |
| 89 | |
| 90 | static void uxsel_tell(Actual_Socket s); |
| 91 | |
| 92 | static int cmpfortree(void *av, void *bv) |
| 93 | { |
| 94 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
| 95 | int as = a->s, bs = b->s; |
| 96 | if (as < bs) |
| 97 | return -1; |
| 98 | if (as > bs) |
| 99 | return +1; |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static int cmpforsearch(void *av, void *bv) |
| 104 | { |
| 105 | Actual_Socket b = (Actual_Socket) bv; |
| 106 | int as = *(int *)av, bs = b->s; |
| 107 | if (as < bs) |
| 108 | return -1; |
| 109 | if (as > bs) |
| 110 | return +1; |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | void sk_init(void) |
| 115 | { |
| 116 | sktree = newtree234(cmpfortree); |
| 117 | } |
| 118 | |
| 119 | void sk_cleanup(void) |
| 120 | { |
| 121 | Actual_Socket s; |
| 122 | int i; |
| 123 | |
| 124 | if (sktree) { |
| 125 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 126 | close(s->s); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) |
| 132 | { |
| 133 | SockAddr ret = snew(struct SockAddr_tag); |
| 134 | #ifndef NO_IPV6 |
| 135 | struct addrinfo hints; |
| 136 | int err; |
| 137 | #else |
| 138 | unsigned long a; |
| 139 | struct hostent *h = NULL; |
| 140 | int n; |
| 141 | #endif |
| 142 | char realhost[8192]; |
| 143 | |
| 144 | /* Clear the structure and default to IPv4. */ |
| 145 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 146 | ret->family = 0; /* We set this one when we have resolved the host. */ |
| 147 | *realhost = '\0'; |
| 148 | ret->error = NULL; |
| 149 | |
| 150 | #ifndef NO_IPV6 |
| 151 | hints.ai_flags = AI_CANONNAME; |
| 152 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 153 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 154 | AF_UNSPEC); |
| 155 | hints.ai_socktype = SOCK_STREAM; |
| 156 | hints.ai_protocol = 0; |
| 157 | hints.ai_addrlen = 0; |
| 158 | hints.ai_addr = NULL; |
| 159 | hints.ai_canonname = NULL; |
| 160 | hints.ai_next = NULL; |
| 161 | err = getaddrinfo(host, NULL, &hints, &ret->ais); |
| 162 | ret->ai = ret->ais; |
| 163 | if (err != 0) { |
| 164 | ret->error = gai_strerror(err); |
| 165 | return ret; |
| 166 | } |
| 167 | ret->family = ret->ai->ai_family; |
| 168 | *realhost = '\0'; |
| 169 | if (ret->ai->ai_canonname != NULL) |
| 170 | strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1); |
| 171 | else |
| 172 | strncat(realhost, host, sizeof(realhost) - 1); |
| 173 | #else |
| 174 | if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { |
| 175 | /* |
| 176 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
| 177 | * we don't use gethostbyname as a fallback!) |
| 178 | */ |
| 179 | if (ret->family == 0) { |
| 180 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
| 181 | if ( (h = gethostbyname(host)) ) |
| 182 | ret->family = AF_INET; |
| 183 | } |
| 184 | if (ret->family == 0) { |
| 185 | ret->error = (h_errno == HOST_NOT_FOUND || |
| 186 | h_errno == NO_DATA || |
| 187 | h_errno == NO_ADDRESS ? "Host does not exist" : |
| 188 | h_errno == TRY_AGAIN ? |
| 189 | "Temporary name service failure" : |
| 190 | "gethostbyname: unknown error"); |
| 191 | return ret; |
| 192 | } |
| 193 | /* This way we are always sure the h->h_name is valid :) */ |
| 194 | strncpy(realhost, h->h_name, sizeof(realhost)); |
| 195 | for (n = 0; h->h_addr_list[n]; n++); |
| 196 | ret->addresses = snewn(n, unsigned long); |
| 197 | ret->naddresses = n; |
| 198 | for (n = 0; n < ret->naddresses; n++) { |
| 199 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
| 200 | ret->addresses[n] = ntohl(a); |
| 201 | } |
| 202 | } else { |
| 203 | /* |
| 204 | * This must be a numeric IPv4 address because it caused a |
| 205 | * success return from inet_addr. |
| 206 | */ |
| 207 | ret->family = AF_INET; |
| 208 | strncpy(realhost, host, sizeof(realhost)); |
| 209 | ret->addresses = snew(unsigned long); |
| 210 | ret->naddresses = 1; |
| 211 | ret->addresses[0] = ntohl(a); |
| 212 | ret->curraddr = 0; |
| 213 | } |
| 214 | #endif |
| 215 | realhost[lenof(realhost)-1] = '\0'; |
| 216 | *canonicalname = snewn(1+strlen(realhost), char); |
| 217 | strcpy(*canonicalname, realhost); |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | SockAddr sk_nonamelookup(const char *host) |
| 222 | { |
| 223 | SockAddr ret = snew(struct SockAddr_tag); |
| 224 | ret->error = NULL; |
| 225 | ret->family = AF_UNSPEC; |
| 226 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
| 227 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
| 228 | #ifndef NO_IPV6 |
| 229 | ret->ais = NULL; |
| 230 | #else |
| 231 | ret->addresses = NULL; |
| 232 | #endif |
| 233 | return ret; |
| 234 | } |
| 235 | |
| 236 | static int sk_nextaddr(SockAddr addr) |
| 237 | { |
| 238 | #ifndef NO_IPV6 |
| 239 | if (addr->ai && addr->ai->ai_next) { |
| 240 | addr->ai = addr->ai->ai_next; |
| 241 | addr->family = addr->ai->ai_family; |
| 242 | return TRUE; |
| 243 | } else |
| 244 | return FALSE; |
| 245 | #else |
| 246 | if (addr->curraddr+1 < addr->naddresses) { |
| 247 | addr->curraddr++; |
| 248 | return TRUE; |
| 249 | } else { |
| 250 | return FALSE; |
| 251 | } |
| 252 | #endif |
| 253 | } |
| 254 | |
| 255 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
| 256 | { |
| 257 | |
| 258 | if (addr->family == AF_UNSPEC) { |
| 259 | strncpy(buf, addr->hostname, buflen); |
| 260 | buf[buflen-1] = '\0'; |
| 261 | } else { |
| 262 | #ifndef NO_IPV6 |
| 263 | if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen, |
| 264 | NULL, 0, NI_NUMERICHOST) != 0) { |
| 265 | buf[0] = '\0'; |
| 266 | strncat(buf, "<unknown>", buflen - 1); |
| 267 | } |
| 268 | #else |
| 269 | struct in_addr a; |
| 270 | assert(addr->family == AF_INET); |
| 271 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
| 272 | strncpy(buf, inet_ntoa(a), buflen); |
| 273 | buf[buflen-1] = '\0'; |
| 274 | #endif |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | int sk_hostname_is_local(char *name) |
| 279 | { |
| 280 | return !strcmp(name, "localhost"); |
| 281 | } |
| 282 | |
| 283 | #define ipv4_is_loopback(addr) \ |
| 284 | (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) |
| 285 | |
| 286 | static int sockaddr_is_loopback(struct sockaddr *sa) |
| 287 | { |
| 288 | struct sockaddr_in *sin; |
| 289 | #ifndef NO_IPV6 |
| 290 | struct sockaddr_in6 *sin6; |
| 291 | #endif |
| 292 | |
| 293 | switch (sa->sa_family) { |
| 294 | case AF_INET: |
| 295 | sin = (struct sockaddr_in *)sa; |
| 296 | return ipv4_is_loopback(sin->sin_addr); |
| 297 | #ifndef NO_IPV6 |
| 298 | case AF_INET6: |
| 299 | sin6 = (struct sockaddr_in6 *)sa; |
| 300 | return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr); |
| 301 | #endif |
| 302 | case AF_UNIX: |
| 303 | return TRUE; |
| 304 | default: |
| 305 | return FALSE; |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | int sk_address_is_local(SockAddr addr) |
| 310 | { |
| 311 | |
| 312 | if (addr->family == AF_UNSPEC) |
| 313 | return 0; /* we don't know; assume not */ |
| 314 | else { |
| 315 | #ifndef NO_IPV6 |
| 316 | return sockaddr_is_loopback(addr->ai->ai_addr); |
| 317 | #else |
| 318 | struct in_addr a; |
| 319 | assert(addr->family == AF_INET); |
| 320 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
| 321 | return ipv4_is_loopback(a); |
| 322 | #endif |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | int sk_addrtype(SockAddr addr) |
| 327 | { |
| 328 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
| 329 | #ifndef NO_IPV6 |
| 330 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
| 331 | #endif |
| 332 | ADDRTYPE_NAME); |
| 333 | } |
| 334 | |
| 335 | void sk_addrcopy(SockAddr addr, char *buf) |
| 336 | { |
| 337 | |
| 338 | #ifndef NO_IPV6 |
| 339 | if (addr->family == AF_INET) |
| 340 | memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, |
| 341 | sizeof(struct in_addr)); |
| 342 | else if (addr->family == AF_INET6) |
| 343 | memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, |
| 344 | sizeof(struct in6_addr)); |
| 345 | else |
| 346 | assert(FALSE); |
| 347 | #else |
| 348 | struct in_addr a; |
| 349 | |
| 350 | assert(addr->family == AF_INET); |
| 351 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
| 352 | memcpy(buf, (char*) &a.s_addr, 4); |
| 353 | #endif |
| 354 | } |
| 355 | |
| 356 | void sk_addr_free(SockAddr addr) |
| 357 | { |
| 358 | |
| 359 | #ifndef NO_IPV6 |
| 360 | if (addr->ais != NULL) |
| 361 | freeaddrinfo(addr->ais); |
| 362 | #else |
| 363 | sfree(addr->addresses); |
| 364 | #endif |
| 365 | sfree(addr); |
| 366 | } |
| 367 | |
| 368 | static Plug sk_tcp_plug(Socket sock, Plug p) |
| 369 | { |
| 370 | Actual_Socket s = (Actual_Socket) sock; |
| 371 | Plug ret = s->plug; |
| 372 | if (p) |
| 373 | s->plug = p; |
| 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | static void sk_tcp_flush(Socket s) |
| 378 | { |
| 379 | /* |
| 380 | * We send data to the socket as soon as we can anyway, |
| 381 | * so we don't need to do anything here. :-) |
| 382 | */ |
| 383 | } |
| 384 | |
| 385 | static void sk_tcp_close(Socket s); |
| 386 | static int sk_tcp_write(Socket s, const char *data, int len); |
| 387 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
| 388 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
| 389 | static void *sk_tcp_get_private_ptr(Socket s); |
| 390 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
| 391 | static const char *sk_tcp_socket_error(Socket s); |
| 392 | |
| 393 | static struct socket_function_table tcp_fn_table = { |
| 394 | sk_tcp_plug, |
| 395 | sk_tcp_close, |
| 396 | sk_tcp_write, |
| 397 | sk_tcp_write_oob, |
| 398 | sk_tcp_flush, |
| 399 | sk_tcp_set_private_ptr, |
| 400 | sk_tcp_get_private_ptr, |
| 401 | sk_tcp_set_frozen, |
| 402 | sk_tcp_socket_error |
| 403 | }; |
| 404 | |
| 405 | Socket sk_register(OSSocket sockfd, Plug plug) |
| 406 | { |
| 407 | Actual_Socket ret; |
| 408 | |
| 409 | /* |
| 410 | * Create Socket structure. |
| 411 | */ |
| 412 | ret = snew(struct Socket_tag); |
| 413 | ret->fn = &tcp_fn_table; |
| 414 | ret->error = NULL; |
| 415 | ret->plug = plug; |
| 416 | bufchain_init(&ret->output_data); |
| 417 | ret->writable = 1; /* to start with */ |
| 418 | ret->sending_oob = 0; |
| 419 | ret->frozen = 1; |
| 420 | ret->frozen_readable = 0; |
| 421 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 422 | ret->pending_error = 0; |
| 423 | ret->oobpending = FALSE; |
| 424 | ret->listener = 0; |
| 425 | ret->addr = NULL; |
| 426 | ret->connected = 1; |
| 427 | |
| 428 | ret->s = sockfd; |
| 429 | |
| 430 | if (ret->s < 0) { |
| 431 | ret->error = strerror(errno); |
| 432 | return (Socket) ret; |
| 433 | } |
| 434 | |
| 435 | ret->oobinline = 0; |
| 436 | |
| 437 | uxsel_tell(ret); |
| 438 | add234(sktree, ret); |
| 439 | |
| 440 | return (Socket) ret; |
| 441 | } |
| 442 | |
| 443 | static int try_connect(Actual_Socket sock) |
| 444 | { |
| 445 | int s; |
| 446 | #ifndef NO_IPV6 |
| 447 | struct sockaddr_in6 a6; |
| 448 | #endif |
| 449 | struct sockaddr_in a; |
| 450 | struct sockaddr_un au; |
| 451 | const struct sockaddr *sa; |
| 452 | int err = 0; |
| 453 | short localport; |
| 454 | int fl, salen; |
| 455 | |
| 456 | if (sock->s >= 0) |
| 457 | close(sock->s); |
| 458 | |
| 459 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
| 460 | |
| 461 | /* |
| 462 | * Open socket. |
| 463 | */ |
| 464 | assert(sock->addr->family != AF_UNSPEC); |
| 465 | s = socket(sock->addr->family, SOCK_STREAM, 0); |
| 466 | sock->s = s; |
| 467 | |
| 468 | if (s < 0) { |
| 469 | err = errno; |
| 470 | goto ret; |
| 471 | } |
| 472 | |
| 473 | if (sock->oobinline) { |
| 474 | int b = TRUE; |
| 475 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
| 476 | } |
| 477 | |
| 478 | if (sock->nodelay) { |
| 479 | int b = TRUE; |
| 480 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
| 481 | } |
| 482 | |
| 483 | if (sock->keepalive) { |
| 484 | int b = TRUE; |
| 485 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Bind to local address. |
| 490 | */ |
| 491 | if (sock->privport) |
| 492 | localport = 1023; /* count from 1023 downwards */ |
| 493 | else |
| 494 | localport = 0; /* just use port 0 (ie kernel picks) */ |
| 495 | |
| 496 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
| 497 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
| 498 | #ifndef NO_IPV6 |
| 499 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
| 500 | #endif |
| 501 | |
| 502 | /* We don't try to bind to a local address for UNIX domain sockets. (Why |
| 503 | * do we bother doing the bind when localport == 0 anyway?) */ |
| 504 | if(sock->addr->family != AF_UNIX) { |
| 505 | /* Loop round trying to bind */ |
| 506 | while (1) { |
| 507 | int retcode; |
| 508 | |
| 509 | #ifndef NO_IPV6 |
| 510 | if (sock->addr->family == AF_INET6) { |
| 511 | /* XXX use getaddrinfo to get a local address? */ |
| 512 | a6.sin6_family = AF_INET6; |
| 513 | a6.sin6_addr = in6addr_any; |
| 514 | a6.sin6_port = htons(localport); |
| 515 | retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); |
| 516 | } else |
| 517 | #endif |
| 518 | { |
| 519 | assert(sock->addr->family == AF_INET); |
| 520 | a.sin_family = AF_INET; |
| 521 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
| 522 | a.sin_port = htons(localport); |
| 523 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 524 | } |
| 525 | if (retcode >= 0) { |
| 526 | err = 0; |
| 527 | break; /* done */ |
| 528 | } else { |
| 529 | err = errno; |
| 530 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
| 531 | break; |
| 532 | } |
| 533 | |
| 534 | if (localport == 0) |
| 535 | break; /* we're only looping once */ |
| 536 | localport--; |
| 537 | if (localport == 0) |
| 538 | break; /* we might have got to the end */ |
| 539 | } |
| 540 | |
| 541 | if (err) |
| 542 | goto ret; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * Connect to remote address. |
| 547 | */ |
| 548 | switch(sock->addr->family) { |
| 549 | #ifndef NO_IPV6 |
| 550 | case AF_INET: |
| 551 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ |
| 552 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
| 553 | htons(sock->port); |
| 554 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
| 555 | salen = sock->addr->ai->ai_addrlen; |
| 556 | break; |
| 557 | case AF_INET6: |
| 558 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
| 559 | htons(sock->port); |
| 560 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
| 561 | salen = sock->addr->ai->ai_addrlen; |
| 562 | break; |
| 563 | #else |
| 564 | case AF_INET: |
| 565 | a.sin_family = AF_INET; |
| 566 | a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]); |
| 567 | a.sin_port = htons((short) sock->port); |
| 568 | sa = (const struct sockaddr *)&a; |
| 569 | salen = sizeof a; |
| 570 | break; |
| 571 | #endif |
| 572 | case AF_UNIX: |
| 573 | assert(sock->port == 0); /* to catch confused people */ |
| 574 | assert(strlen(sock->addr->hostname) < sizeof au.sun_path); |
| 575 | memset(&au, 0, sizeof au); |
| 576 | au.sun_family = AF_UNIX; |
| 577 | strcpy(au.sun_path, sock->addr->hostname); |
| 578 | sa = (const struct sockaddr *)&au; |
| 579 | salen = sizeof au; |
| 580 | break; |
| 581 | |
| 582 | default: |
| 583 | assert(0 && "unknown address family"); |
| 584 | exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ |
| 585 | } |
| 586 | |
| 587 | fl = fcntl(s, F_GETFL); |
| 588 | if (fl != -1) |
| 589 | fcntl(s, F_SETFL, fl | O_NONBLOCK); |
| 590 | |
| 591 | if ((connect(s, sa, salen)) < 0) { |
| 592 | if ( errno != EINPROGRESS ) { |
| 593 | err = errno; |
| 594 | goto ret; |
| 595 | } |
| 596 | } else { |
| 597 | /* |
| 598 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
| 599 | * and we should set the socket as connected and writable. |
| 600 | */ |
| 601 | sock->connected = 1; |
| 602 | sock->writable = 1; |
| 603 | } |
| 604 | |
| 605 | uxsel_tell(sock); |
| 606 | add234(sktree, sock); |
| 607 | |
| 608 | ret: |
| 609 | if (err) |
| 610 | plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); |
| 611 | return err; |
| 612 | } |
| 613 | |
| 614 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
| 615 | int nodelay, int keepalive, Plug plug) |
| 616 | { |
| 617 | Actual_Socket ret; |
| 618 | int err; |
| 619 | |
| 620 | /* |
| 621 | * Create Socket structure. |
| 622 | */ |
| 623 | ret = snew(struct Socket_tag); |
| 624 | ret->fn = &tcp_fn_table; |
| 625 | ret->error = NULL; |
| 626 | ret->plug = plug; |
| 627 | bufchain_init(&ret->output_data); |
| 628 | ret->connected = 0; /* to start with */ |
| 629 | ret->writable = 0; /* to start with */ |
| 630 | ret->sending_oob = 0; |
| 631 | ret->frozen = 0; |
| 632 | ret->frozen_readable = 0; |
| 633 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 634 | ret->pending_error = 0; |
| 635 | ret->oobpending = FALSE; |
| 636 | ret->listener = 0; |
| 637 | ret->addr = addr; |
| 638 | ret->s = -1; |
| 639 | ret->oobinline = oobinline; |
| 640 | ret->nodelay = nodelay; |
| 641 | ret->keepalive = keepalive; |
| 642 | ret->privport = privport; |
| 643 | ret->port = port; |
| 644 | |
| 645 | err = 0; |
| 646 | do { |
| 647 | err = try_connect(ret); |
| 648 | } while (err && sk_nextaddr(ret->addr)); |
| 649 | |
| 650 | if (err) |
| 651 | ret->error = strerror(err); |
| 652 | |
| 653 | return (Socket) ret; |
| 654 | } |
| 655 | |
| 656 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family) |
| 657 | { |
| 658 | int s; |
| 659 | #ifndef NO_IPV6 |
| 660 | struct addrinfo hints, *ai; |
| 661 | char portstr[6]; |
| 662 | struct sockaddr_in6 a6; |
| 663 | #endif |
| 664 | struct sockaddr *addr; |
| 665 | int addrlen; |
| 666 | struct sockaddr_in a; |
| 667 | Actual_Socket ret; |
| 668 | int retcode; |
| 669 | int on = 1; |
| 670 | |
| 671 | /* |
| 672 | * Create Socket structure. |
| 673 | */ |
| 674 | ret = snew(struct Socket_tag); |
| 675 | ret->fn = &tcp_fn_table; |
| 676 | ret->error = NULL; |
| 677 | ret->plug = plug; |
| 678 | bufchain_init(&ret->output_data); |
| 679 | ret->writable = 0; /* to start with */ |
| 680 | ret->sending_oob = 0; |
| 681 | ret->frozen = 0; |
| 682 | ret->frozen_readable = 0; |
| 683 | ret->localhost_only = local_host_only; |
| 684 | ret->pending_error = 0; |
| 685 | ret->oobpending = FALSE; |
| 686 | ret->listener = 1; |
| 687 | ret->addr = NULL; |
| 688 | |
| 689 | /* |
| 690 | * Translate address_family from platform-independent constants |
| 691 | * into local reality. |
| 692 | */ |
| 693 | address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 694 | #ifndef NO_IPV6 |
| 695 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 696 | #endif |
| 697 | AF_UNSPEC); |
| 698 | |
| 699 | #ifndef NO_IPV6 |
| 700 | /* Let's default to IPv6. |
| 701 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ |
| 702 | if (address_family == AF_UNSPEC) address_family = AF_INET6; |
| 703 | #else |
| 704 | /* No other choice, default to IPv4 */ |
| 705 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
| 706 | #endif |
| 707 | |
| 708 | /* |
| 709 | * Open socket. |
| 710 | */ |
| 711 | s = socket(address_family, SOCK_STREAM, 0); |
| 712 | |
| 713 | #ifndef NO_IPV6 |
| 714 | /* If the host doesn't support IPv6 try fallback to IPv4. */ |
| 715 | if (s < 0 && address_family == AF_INET6) { |
| 716 | address_family = AF_INET; |
| 717 | s = socket(address_family, SOCK_STREAM, 0); |
| 718 | } |
| 719 | #endif |
| 720 | |
| 721 | if (s < 0) { |
| 722 | ret->error = strerror(errno); |
| 723 | return (Socket) ret; |
| 724 | } |
| 725 | |
| 726 | ret->oobinline = 0; |
| 727 | |
| 728 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
| 729 | |
| 730 | retcode = -1; |
| 731 | addr = NULL; addrlen = -1; /* placate optimiser */ |
| 732 | |
| 733 | if (srcaddr != NULL) { |
| 734 | #ifndef NO_IPV6 |
| 735 | hints.ai_flags = AI_NUMERICHOST; |
| 736 | hints.ai_family = address_family; |
| 737 | hints.ai_socktype = SOCK_STREAM; |
| 738 | hints.ai_protocol = 0; |
| 739 | hints.ai_addrlen = 0; |
| 740 | hints.ai_addr = NULL; |
| 741 | hints.ai_canonname = NULL; |
| 742 | hints.ai_next = NULL; |
| 743 | assert(port >= 0 && port <= 99999); |
| 744 | sprintf(portstr, "%d", port); |
| 745 | retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); |
| 746 | if (retcode == 0) { |
| 747 | addr = ai->ai_addr; |
| 748 | addrlen = ai->ai_addrlen; |
| 749 | } |
| 750 | #else |
| 751 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
| 752 | a.sin_family = AF_INET; |
| 753 | a.sin_port = htons(port); |
| 754 | a.sin_addr.s_addr = inet_addr(srcaddr); |
| 755 | if (a.sin_addr.s_addr != (in_addr_t)(-1)) { |
| 756 | /* Override localhost_only with specified listen addr. */ |
| 757 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
| 758 | } |
| 759 | addr = (struct sockaddr *)&a; |
| 760 | addrlen = sizeof(a); |
| 761 | retcode = 0; |
| 762 | #endif |
| 763 | } |
| 764 | |
| 765 | if (retcode != 0) { |
| 766 | #ifndef NO_IPV6 |
| 767 | if (address_family == AF_INET6) { |
| 768 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
| 769 | a6.sin6_family = AF_INET6; |
| 770 | a6.sin6_port = htons(port); |
| 771 | if (local_host_only) |
| 772 | a6.sin6_addr = in6addr_loopback; |
| 773 | else |
| 774 | a6.sin6_addr = in6addr_any; |
| 775 | addr = (struct sockaddr *)&a6; |
| 776 | addrlen = sizeof(a6); |
| 777 | } else |
| 778 | #endif |
| 779 | { |
| 780 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
| 781 | a.sin_family = AF_INET; |
| 782 | a.sin_port = htons(port); |
| 783 | if (local_host_only) |
| 784 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 785 | else |
| 786 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
| 787 | addr = (struct sockaddr *)&a; |
| 788 | addrlen = sizeof(a); |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | retcode = bind(s, addr, addrlen); |
| 793 | if (retcode < 0) { |
| 794 | close(s); |
| 795 | ret->error = strerror(errno); |
| 796 | return (Socket) ret; |
| 797 | } |
| 798 | |
| 799 | if (listen(s, SOMAXCONN) < 0) { |
| 800 | close(s); |
| 801 | ret->error = strerror(errno); |
| 802 | return (Socket) ret; |
| 803 | } |
| 804 | |
| 805 | ret->s = s; |
| 806 | |
| 807 | uxsel_tell(ret); |
| 808 | add234(sktree, ret); |
| 809 | |
| 810 | return (Socket) ret; |
| 811 | } |
| 812 | |
| 813 | static void sk_tcp_close(Socket sock) |
| 814 | { |
| 815 | Actual_Socket s = (Actual_Socket) sock; |
| 816 | |
| 817 | uxsel_del(s->s); |
| 818 | del234(sktree, s); |
| 819 | close(s->s); |
| 820 | if (s->addr) |
| 821 | sk_addr_free(s->addr); |
| 822 | sfree(s); |
| 823 | } |
| 824 | |
| 825 | void *sk_getxdmdata(void *sock, int *lenp) |
| 826 | { |
| 827 | Actual_Socket s = (Actual_Socket) sock; |
| 828 | #ifdef NO_IPV6 |
| 829 | struct sockaddr_in addr; |
| 830 | #else |
| 831 | struct sockaddr_storage addr; |
| 832 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr; |
| 833 | #endif |
| 834 | struct sockaddr *sa = (struct sockaddr *)&addr; |
| 835 | struct sockaddr_in *sin = (struct sockaddr_in *)&addr; |
| 836 | socklen_t addrlen; |
| 837 | char *buf; |
| 838 | static unsigned int unix_addr = 0xFFFFFFFF; |
| 839 | |
| 840 | /* |
| 841 | * We must check that this socket really _is_ an Actual_Socket. |
| 842 | */ |
| 843 | if (s->fn != &tcp_fn_table) |
| 844 | return NULL; /* failure */ |
| 845 | |
| 846 | addrlen = sizeof(addr); |
| 847 | if (getsockname(s->s, sa, &addrlen) < 0) |
| 848 | return NULL; |
| 849 | switch(sa->sa_family) { |
| 850 | case AF_INET: |
| 851 | *lenp = 6; |
| 852 | buf = snewn(*lenp, char); |
| 853 | PUT_32BIT_MSB_FIRST(buf, ntohl(sin->sin_addr.s_addr)); |
| 854 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin->sin_port)); |
| 855 | break; |
| 856 | #ifndef NO_IPV6 |
| 857 | case AF_INET6: |
| 858 | *lenp = 6; |
| 859 | buf = snewn(*lenp, char); |
| 860 | if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { |
| 861 | memcpy(buf, sin6->sin6_addr.s6_addr + 12, 4); |
| 862 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin6->sin6_port)); |
| 863 | } else |
| 864 | /* This is stupid, but it's what XLib does. */ |
| 865 | memset(buf, 0, 6); |
| 866 | break; |
| 867 | #endif |
| 868 | case AF_UNIX: |
| 869 | *lenp = 6; |
| 870 | buf = snewn(*lenp, char); |
| 871 | PUT_32BIT_MSB_FIRST(buf, unix_addr--); |
| 872 | PUT_16BIT_MSB_FIRST(buf+4, getpid()); |
| 873 | break; |
| 874 | |
| 875 | /* XXX IPV6 */ |
| 876 | |
| 877 | default: |
| 878 | return NULL; |
| 879 | } |
| 880 | |
| 881 | return buf; |
| 882 | } |
| 883 | |
| 884 | /* |
| 885 | * The function which tries to send on a socket once it's deemed |
| 886 | * writable. |
| 887 | */ |
| 888 | void try_send(Actual_Socket s) |
| 889 | { |
| 890 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
| 891 | int nsent; |
| 892 | int err; |
| 893 | void *data; |
| 894 | int len, urgentflag; |
| 895 | |
| 896 | if (s->sending_oob) { |
| 897 | urgentflag = MSG_OOB; |
| 898 | len = s->sending_oob; |
| 899 | data = &s->oobdata; |
| 900 | } else { |
| 901 | urgentflag = 0; |
| 902 | bufchain_prefix(&s->output_data, &data, &len); |
| 903 | } |
| 904 | nsent = send(s->s, data, len, urgentflag); |
| 905 | noise_ultralight(nsent); |
| 906 | if (nsent <= 0) { |
| 907 | err = (nsent < 0 ? errno : 0); |
| 908 | if (err == EWOULDBLOCK) { |
| 909 | /* |
| 910 | * Perfectly normal: we've sent all we can for the moment. |
| 911 | */ |
| 912 | s->writable = FALSE; |
| 913 | return; |
| 914 | } else { |
| 915 | /* |
| 916 | * We unfortunately can't just call plug_closing(), |
| 917 | * because it's quite likely that we're currently |
| 918 | * _in_ a call from the code we'd be calling back |
| 919 | * to, so we'd have to make half the SSH code |
| 920 | * reentrant. Instead we flag a pending error on |
| 921 | * the socket, to be dealt with (by calling |
| 922 | * plug_closing()) at some suitable future moment. |
| 923 | */ |
| 924 | s->pending_error = err; |
| 925 | return; |
| 926 | } |
| 927 | } else { |
| 928 | if (s->sending_oob) { |
| 929 | if (nsent < len) { |
| 930 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
| 931 | s->sending_oob = len - nsent; |
| 932 | } else { |
| 933 | s->sending_oob = 0; |
| 934 | } |
| 935 | } else { |
| 936 | bufchain_consume(&s->output_data, nsent); |
| 937 | } |
| 938 | } |
| 939 | } |
| 940 | uxsel_tell(s); |
| 941 | } |
| 942 | |
| 943 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
| 944 | { |
| 945 | Actual_Socket s = (Actual_Socket) sock; |
| 946 | |
| 947 | /* |
| 948 | * Add the data to the buffer list on the socket. |
| 949 | */ |
| 950 | bufchain_add(&s->output_data, buf, len); |
| 951 | |
| 952 | /* |
| 953 | * Now try sending from the start of the buffer list. |
| 954 | */ |
| 955 | if (s->writable) |
| 956 | try_send(s); |
| 957 | |
| 958 | /* |
| 959 | * Update the select() status to correctly reflect whether or |
| 960 | * not we should be selecting for write. |
| 961 | */ |
| 962 | uxsel_tell(s); |
| 963 | |
| 964 | return bufchain_size(&s->output_data); |
| 965 | } |
| 966 | |
| 967 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
| 968 | { |
| 969 | Actual_Socket s = (Actual_Socket) sock; |
| 970 | |
| 971 | /* |
| 972 | * Replace the buffer list on the socket with the data. |
| 973 | */ |
| 974 | bufchain_clear(&s->output_data); |
| 975 | assert(len <= sizeof(s->oobdata)); |
| 976 | memcpy(s->oobdata, buf, len); |
| 977 | s->sending_oob = len; |
| 978 | |
| 979 | /* |
| 980 | * Now try sending from the start of the buffer list. |
| 981 | */ |
| 982 | if (s->writable) |
| 983 | try_send(s); |
| 984 | |
| 985 | /* |
| 986 | * Update the select() status to correctly reflect whether or |
| 987 | * not we should be selecting for write. |
| 988 | */ |
| 989 | uxsel_tell(s); |
| 990 | |
| 991 | return s->sending_oob; |
| 992 | } |
| 993 | |
| 994 | static int net_select_result(int fd, int event) |
| 995 | { |
| 996 | int ret; |
| 997 | char buf[20480]; /* nice big buffer for plenty of speed */ |
| 998 | Actual_Socket s; |
| 999 | u_long atmark; |
| 1000 | |
| 1001 | /* Find the Socket structure */ |
| 1002 | s = find234(sktree, &fd, cmpforsearch); |
| 1003 | if (!s) |
| 1004 | return 1; /* boggle */ |
| 1005 | |
| 1006 | noise_ultralight(event); |
| 1007 | |
| 1008 | switch (event) { |
| 1009 | case 4: /* exceptional */ |
| 1010 | if (!s->oobinline) { |
| 1011 | /* |
| 1012 | * On a non-oobinline socket, this indicates that we |
| 1013 | * can immediately perform an OOB read and get back OOB |
| 1014 | * data, which we will send to the back end with |
| 1015 | * type==2 (urgent data). |
| 1016 | */ |
| 1017 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
| 1018 | noise_ultralight(ret); |
| 1019 | if (ret <= 0) { |
| 1020 | return plug_closing(s->plug, |
| 1021 | ret == 0 ? "Internal networking trouble" : |
| 1022 | strerror(errno), errno, 0); |
| 1023 | } else { |
| 1024 | /* |
| 1025 | * Receiving actual data on a socket means we can |
| 1026 | * stop falling back through the candidate |
| 1027 | * addresses to connect to. |
| 1028 | */ |
| 1029 | if (s->addr) { |
| 1030 | sk_addr_free(s->addr); |
| 1031 | s->addr = NULL; |
| 1032 | } |
| 1033 | return plug_receive(s->plug, 2, buf, ret); |
| 1034 | } |
| 1035 | break; |
| 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * If we reach here, this is an oobinline socket, which |
| 1040 | * means we should set s->oobpending and then deal with it |
| 1041 | * when we get called for the readability event (which |
| 1042 | * should also occur). |
| 1043 | */ |
| 1044 | s->oobpending = TRUE; |
| 1045 | break; |
| 1046 | case 1: /* readable; also acceptance */ |
| 1047 | if (s->listener) { |
| 1048 | /* |
| 1049 | * On a listening socket, the readability event means a |
| 1050 | * connection is ready to be accepted. |
| 1051 | */ |
| 1052 | #ifdef NO_IPV6 |
| 1053 | struct sockaddr_in ss; |
| 1054 | #else |
| 1055 | struct sockaddr_storage ss; |
| 1056 | #endif |
| 1057 | socklen_t addrlen = sizeof(ss); |
| 1058 | int t; /* socket of connection */ |
| 1059 | |
| 1060 | memset(&ss, 0, addrlen); |
| 1061 | t = accept(s->s, (struct sockaddr *)&ss, &addrlen); |
| 1062 | if (t < 0) { |
| 1063 | break; |
| 1064 | } |
| 1065 | |
| 1066 | if (s->localhost_only && |
| 1067 | !sockaddr_is_loopback((struct sockaddr *)&ss)) { |
| 1068 | close(t); /* someone let nonlocal through?! */ |
| 1069 | } else if (plug_accepting(s->plug, t)) { |
| 1070 | close(t); /* denied or error */ |
| 1071 | } |
| 1072 | break; |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * If we reach here, this is not a listening socket, so |
| 1077 | * readability really means readability. |
| 1078 | */ |
| 1079 | |
| 1080 | /* In the case the socket is still frozen, we don't even bother */ |
| 1081 | if (s->frozen) { |
| 1082 | s->frozen_readable = 1; |
| 1083 | break; |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * We have received data on the socket. For an oobinline |
| 1088 | * socket, this might be data _before_ an urgent pointer, |
| 1089 | * in which case we send it to the back end with type==1 |
| 1090 | * (data prior to urgent). |
| 1091 | */ |
| 1092 | if (s->oobinline && s->oobpending) { |
| 1093 | atmark = 1; |
| 1094 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
| 1095 | s->oobpending = FALSE; /* clear this indicator */ |
| 1096 | } else |
| 1097 | atmark = 1; |
| 1098 | |
| 1099 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
| 1100 | noise_ultralight(ret); |
| 1101 | if (ret < 0) { |
| 1102 | if (errno == EWOULDBLOCK) { |
| 1103 | break; |
| 1104 | } |
| 1105 | } |
| 1106 | if (ret < 0) { |
| 1107 | /* |
| 1108 | * An error at this point _might_ be an error reported |
| 1109 | * by a non-blocking connect(). So before we return a |
| 1110 | * panic status to the user, let's just see whether |
| 1111 | * that's the case. |
| 1112 | */ |
| 1113 | int err = errno; |
| 1114 | if (s->addr) { |
| 1115 | plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); |
| 1116 | while (s->addr && sk_nextaddr(s->addr)) { |
| 1117 | err = try_connect(s); |
| 1118 | } |
| 1119 | } |
| 1120 | if (err != 0) |
| 1121 | return plug_closing(s->plug, strerror(err), err, 0); |
| 1122 | } else if (0 == ret) { |
| 1123 | return plug_closing(s->plug, NULL, 0, 0); |
| 1124 | } else { |
| 1125 | /* |
| 1126 | * Receiving actual data on a socket means we can |
| 1127 | * stop falling back through the candidate |
| 1128 | * addresses to connect to. |
| 1129 | */ |
| 1130 | if (s->addr) { |
| 1131 | sk_addr_free(s->addr); |
| 1132 | s->addr = NULL; |
| 1133 | } |
| 1134 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
| 1135 | } |
| 1136 | break; |
| 1137 | case 2: /* writable */ |
| 1138 | if (!s->connected) { |
| 1139 | /* |
| 1140 | * select() reports a socket as _writable_ when an |
| 1141 | * asynchronous connection is completed. |
| 1142 | */ |
| 1143 | s->connected = s->writable = 1; |
| 1144 | uxsel_tell(s); |
| 1145 | break; |
| 1146 | } else { |
| 1147 | int bufsize_before, bufsize_after; |
| 1148 | s->writable = 1; |
| 1149 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
| 1150 | try_send(s); |
| 1151 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
| 1152 | if (bufsize_after < bufsize_before) |
| 1153 | plug_sent(s->plug, bufsize_after); |
| 1154 | } |
| 1155 | break; |
| 1156 | } |
| 1157 | |
| 1158 | return 1; |
| 1159 | } |
| 1160 | |
| 1161 | /* |
| 1162 | * Deal with socket errors detected in try_send(). |
| 1163 | */ |
| 1164 | void net_pending_errors(void) |
| 1165 | { |
| 1166 | int i; |
| 1167 | Actual_Socket s; |
| 1168 | |
| 1169 | /* |
| 1170 | * This might be a fiddly business, because it's just possible |
| 1171 | * that handling a pending error on one socket might cause |
| 1172 | * others to be closed. (I can't think of any reason this might |
| 1173 | * happen in current SSH implementation, but to maintain |
| 1174 | * generality of this network layer I'll assume the worst.) |
| 1175 | * |
| 1176 | * So what we'll do is search the socket list for _one_ socket |
| 1177 | * with a pending error, and then handle it, and then search |
| 1178 | * the list again _from the beginning_. Repeat until we make a |
| 1179 | * pass with no socket errors present. That way we are |
| 1180 | * protected against the socket list changing under our feet. |
| 1181 | */ |
| 1182 | |
| 1183 | do { |
| 1184 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 1185 | if (s->pending_error) { |
| 1186 | /* |
| 1187 | * An error has occurred on this socket. Pass it to the |
| 1188 | * plug. |
| 1189 | */ |
| 1190 | plug_closing(s->plug, strerror(s->pending_error), |
| 1191 | s->pending_error, 0); |
| 1192 | break; |
| 1193 | } |
| 1194 | } |
| 1195 | } while (s); |
| 1196 | } |
| 1197 | |
| 1198 | /* |
| 1199 | * Each socket abstraction contains a `void *' private field in |
| 1200 | * which the client can keep state. |
| 1201 | */ |
| 1202 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
| 1203 | { |
| 1204 | Actual_Socket s = (Actual_Socket) sock; |
| 1205 | s->private_ptr = ptr; |
| 1206 | } |
| 1207 | |
| 1208 | static void *sk_tcp_get_private_ptr(Socket sock) |
| 1209 | { |
| 1210 | Actual_Socket s = (Actual_Socket) sock; |
| 1211 | return s->private_ptr; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Special error values are returned from sk_namelookup and sk_new |
| 1216 | * if there's a problem. These functions extract an error message, |
| 1217 | * or return NULL if there's no problem. |
| 1218 | */ |
| 1219 | const char *sk_addr_error(SockAddr addr) |
| 1220 | { |
| 1221 | return addr->error; |
| 1222 | } |
| 1223 | static const char *sk_tcp_socket_error(Socket sock) |
| 1224 | { |
| 1225 | Actual_Socket s = (Actual_Socket) sock; |
| 1226 | return s->error; |
| 1227 | } |
| 1228 | |
| 1229 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
| 1230 | { |
| 1231 | Actual_Socket s = (Actual_Socket) sock; |
| 1232 | if (s->frozen == is_frozen) |
| 1233 | return; |
| 1234 | s->frozen = is_frozen; |
| 1235 | if (!is_frozen && s->frozen_readable) { |
| 1236 | char c; |
| 1237 | recv(s->s, &c, 1, MSG_PEEK); |
| 1238 | } |
| 1239 | s->frozen_readable = 0; |
| 1240 | uxsel_tell(s); |
| 1241 | } |
| 1242 | |
| 1243 | static void uxsel_tell(Actual_Socket s) |
| 1244 | { |
| 1245 | int rwx = 0; |
| 1246 | if (s->listener) { |
| 1247 | rwx |= 1; /* read == accept */ |
| 1248 | } else { |
| 1249 | if (!s->connected) |
| 1250 | rwx |= 2; /* write == connect */ |
| 1251 | if (s->connected && !s->frozen) |
| 1252 | rwx |= 1 | 4; /* read, except */ |
| 1253 | if (bufchain_size(&s->output_data)) |
| 1254 | rwx |= 2; /* write */ |
| 1255 | } |
| 1256 | uxsel_set(s->s, rwx, net_select_result); |
| 1257 | } |
| 1258 | |
| 1259 | int net_service_lookup(char *service) |
| 1260 | { |
| 1261 | struct servent *se; |
| 1262 | se = getservbyname(service, NULL); |
| 1263 | if (se != NULL) |
| 1264 | return ntohs(se->s_port); |
| 1265 | else |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) |
| 1270 | { |
| 1271 | SockAddr ret = snew(struct SockAddr_tag); |
| 1272 | int n; |
| 1273 | |
| 1274 | memset(ret, 0, sizeof *ret); |
| 1275 | ret->family = AF_UNIX; |
| 1276 | n = snprintf(ret->hostname, sizeof ret->hostname, |
| 1277 | "%s%d", X11_UNIX_PATH, displaynum); |
| 1278 | if(n < 0) |
| 1279 | ret->error = "snprintf failed"; |
| 1280 | else if(n >= sizeof ret->hostname) |
| 1281 | ret->error = "X11 UNIX name too long"; |
| 1282 | else |
| 1283 | *canonicalname = dupstr(ret->hostname); |
| 1284 | #ifndef NO_IPV6 |
| 1285 | ret->ai = ret->ais = NULL; |
| 1286 | #else |
| 1287 | ret->addresses = NULL; |
| 1288 | ret->curraddr = ret->naddresses = 0; |
| 1289 | #endif |
| 1290 | return ret; |
| 1291 | } |